Release 0.2.0-rc.4+git68-b4c0988

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -8,6 +8,88 @@ All notable changes to Housecarl are documented here. The format follows
 
 ### Added
 
+- **Sets from Jarl** ([docs/jarl.md](docs/jarl.md#sets-from-jarl)). A set
+  can hold the addresses of names in Jarl instead of listing them:
+  every A and AAAA record of each name, CNAMEs followed (within Jarl's
+  zones, in the same view), one view per name (`NAME@VIEW`; a name more
+  than one view covers must say which). housecarld reads them through
+  Jarl's API every `jarl.refresh` (a minute) and after each change, and
+  when they change applies the ruleset again, without a history entry
+  (audited as `set.jarl`). A set uses only the addresses `within` the
+  zones (their connected networks, which grow with the zone) and
+  networks it names; others are left out and warned of (`jarl_outside`).
+  While Jarl can't be read, sets keep the addresses they had, saved in
+  the database for restarts and in the boot ruleset (`jarl_unreachable`).
+  Names that give nothing say why (`jarl_name`: no record, a wildcard
+  only, a CNAME out of Jarl or in a loop, below a delegation, a secondary
+  zone, more than one view). `hc set add --jarl NAME@VIEW --within ZONE`,
+  `hc set jarl SET [--refresh]`; the kind "from Jarl" and Addresses… on
+  the Sets page; `GET /sets/{name}/jarl`, `POST /sets/{name}/jarl/refresh`.
+  Housecarl's Jarl token needs `records:read` for the zones.
+- An administrator can make an API token for another user in the web
+  UI: New token on the user's row under Users (the CLI's `hc token create
+  --user` and the API could already).
+- **Ban lists** ([docs/bans.md](docs/bans.md)). A program (Guard, which
+  reads logs, or fail2ban) bans an address, of every port or of some,
+  for a time; the ban list says what the address is kept from: the
+  firewall itself (`firewall`), some hosts behind it (`hosts`, port
+  forwards to them included), or `everything`. Bans are dropped ahead of
+  every rule, established connections too, and the banned address's
+  connections are closed. IPv6 addresses are banned by /64 (`group_v6`).
+  Never banned: inside networks, the firewall's own addresses, whoever
+  asks, and the list's `never`. Bans end by themselves, are cut to the
+  list's longest time, survive restarts and reboots, and are audited, but
+  aren't configuration (no history, probation or changesets). `hc
+  banlist`, `hc bans`, `hc ban`, `hc unban`; Traffic → Bans in the web UI;
+  `/banlists` and `/banlists/{ref}/bans` in the API; a `bans` grant that
+  can name lists (`bans:write:web`), in the `viewer` and `operator`
+  roles.
+- **A fail2ban action**, `contrib/fail2ban/action.d/housecarl.conf`
+  (installed under `/usr/share/doc/housecarl/contrib/`): fail2ban's bans
+  go into a ban list, with the jail's port and protocol.
+- **Failed logins in the journal.** A failed login and a refused API
+  token are logged (`msg="login failed" ip=… user=…`), for Guard and
+  fail2ban to act on.
+
+- **Quota usage as a share.** What a quota used shows its percentage
+  (`12.3 GB of 50.0 GB used (24%)`, each address's in the quota
+  dialog), on the Rules page, the dashboard and in `hc quotas`.
+- **Reset one address's quota, or give some back.** `hc rule
+  reset-quota ID --address ADDR` starts only that device's allowance
+  again; `--give 5gbytes` takes that much off what was used instead (one
+  address's, or everyone's): extra allowance until the next reset,
+  without changing the rule. In the web UI, a rule's quota is one
+  line (what it used, how it resets) that opens a dialog with the rest:
+  usage per address, last and next reset, and Reset and Give back for
+  everyone or one address. `POST /rules/{ref}/reset-quota` takes `address` and `give`.
+- **Names beside inside addresses.** Connections, the log, quota usage,
+  the dashboard's quotas and the statistics' devices and blocked
+  sources show each inside address's name, found by a reverse lookup:
+  `laptop 192.168.1.20` in the web UI, `192.168.1.20 (laptop)` in `hc`.
+  Only inside addresses are looked up (an inside zone's networks, and
+  private ones outside the external zones'). Names are cached for 10
+  minutes and never stored. `names.enabled`, `names.resolver` and
+  `names.cache` in housecarl.yaml; `hc --no-names`; `POST /names`.
+- **Quotas on the dashboard.** With any rule holding a quota, the
+  dashboard lists them all: the allowance, what is used (for a
+  per-address quota, how many addresses and the busiest) with a bar, and
+  the next reset. Each opens its rule.
+- **Links to a rule open it.** A rule named in the matrix, the log, the
+  tracer, statistics or the dashboard's busiest rules opens the Rules
+  page on its chain, scrolled to it and highlighted (`#/rules?rule=ID`).
+  The Rules page shows each rule's ID (`#410`, as `hc` and labels name
+  it) beside its order.
+- **A clearer zone matrix.** A cell reads allow, block, or **partly**
+  (some new connections let through, the rest not), with the exceptions
+  counted by what they do (`+3 -1` instead of `+4`), and what they let
+  through: services with the addresses they're limited to (`ssh from
+  trusted`, `5 port forwards`), under the grid in `hc matrix`, in each
+  cell on the Matrix page. A zone to itself is marked (only traffic routed
+  between its interfaces passes the firewall). The details list each
+  rule's hits. API: `summary`, `allowed`, `blocked`, `open`,
+  `same_zone`, `note`, `hits`, and `short` and `hits` per exception.
+  Raw rules that are a match and then accept, drop or reject (without
+  interfaces) are read instead of shown as unknown.
 - **Shadow mode** (`shadow.enabled` in housecarl.yaml; docs/shadow.md):
   Housecarl's ruleset is loaded beside the firewall you have but blocks,
   rejects and translates nothing. Drops and rejects are counted and accept
@@ -40,8 +122,88 @@ All notable changes to Housecarl are documented here. The format follows
 - Import: sets with `flags timeout` become dynamic sets; a DNAT of
   several ports becomes one port forward per port.
 
+### Changed
+
+- `hc user delete` asks first, as every other delete does, and takes
+  `-y`/`--yes` not to; it deleted the user and their tokens at once.
+- The ruleset's diff (Changes, `hc changeset diff`, `--dry-run`) names
+  the chain each part is in on its `@@` line (`@@ -40,6 +40,8 @@ chain
+  forward`), as `git diff` names the function, so a rule added deep in a
+  long chain says whether it is in input, forward or output.
+- **History shows the ruleset's diff.** An entry's page (and `hc history
+  diff ID`, `GET /history/{id}/diff`) shows what the change did to the
+  ruleset, for entries made before this version too: the configuration
+  before and after it is got back from the current one and rendered by
+  this version.
+- Negating a match is said first: the zone, From and To fields (rules
+  and NAT) start with "any of" / "any but" instead of a checkbox under
+  the list, shown once the list has an entry, and an "any but" list is
+  marked with a red bar. An empty list is never saved as negated (it
+  matched everything anyway, but would have negated what was added to
+  it later).
+- docs/rules.md: "Matching everything but a few", on leaving some
+  addresses out with a zone and "any but", and what to do when the range
+  isn't a zone.
+- The rule dialog shows only the zone fields its chain can use: no
+  "Going out on" for input and early, no "Coming in on" for output
+  (they could only be refused). A zone left in a field the chain hides
+  isn't sent.
+- History lists a changed setting by its own fields
+  (`builtins.drop_invalid: false → true`), on the web page and in `hc
+  history show`, instead of the whole `builtins` before and after.
+- Set names starting with `ban_` are now reserved (`set_name_reserved`):
+  ban lists' sets use them.
+- **Rules read as a direction.** A match's zones are written `lan → wan`,
+  `any but wan → any`, or with the firewall itself as the other end
+  (`lan → firewall` in input, `firewall → wan` in output), instead of
+  `in lan · out wan` and `in not wan`; exclusions read `from any but X`.
+  On the Rules and NAT pages and in `hc`; the flags and JSON stay as
+  they were.
+
 ### Fixed
 
+- `hc forward show` shows the forward's hits and comment, and its
+  hairpin as `no`, `yes` or `yes, from …` (it printed `no -`).
+- A history entry's ruleset diff showed the object it changed as moved:
+  stepping back put the old form at the end of its list, so updating
+  one port forward (turning hairpin off) also showed its forward and
+  DNAT lines moving down. The diff is now only what the change did, and
+  its sides are named `before N` and `after N` instead of `now`.
+- Ruleset diffs numbered the hunks after one with a moved line too early
+  on the new side (`@@ -76,9 +74,9 @@` for `+76,9`), so the chain named
+  after `@@` could be the one before (`chain output` for a hunk in
+  `chain dstnat`). go-udiff miscounts them; Housecarl now numbers them
+  itself.
+- The dashboard's bar for a per-address quota showed only the busiest
+  address, so one address that used up its allowance filled it (100%).
+  The bar is now all the addresses together, and the dashboard and the
+  rule's quota line say how many addresses used theirs up.
+- Changing how a quota counts lost or muddled what it used: per address
+  to a total started at nothing, per source to per destination kept the
+  sources' use as if it were the destinations', and other groups left
+  the old entries behind. Now a total starts at the addresses' sum,
+  wider groups add up their addresses, and what can't be carried starts
+  again with a warning (`quota_restarts`) on the change.
+- What the quotas used is saved after every change, not only every five
+  minutes: a reboot soon after a change that counts a quota differently
+  could bring back its usage counted the old way.
+- Statistics' Quotas card linked every entry to the Rules page, not to
+  its rule; each now opens its rule, named. Per-address quotas were
+  missing from it (and from the `quota:rN` series): they count their
+  addresses' sum.
+- `hc stats top devices` listed each device twice (once for what it
+  received, once for what it sent); it is one row with both again.
+- `hc rule add --before/--after/--first` made two changes (create at the
+  end, then move), so two history entries, two probations, and the rule
+  briefly in force at the end of its chain; staged in a changeset, the
+  place was lost. The create now takes the place (`POST
+  /rules?before=ID`, `after`, `first`) and makes one change.
+- `hc matrix` in a terminal: the colours' escape codes threw the columns
+  out of line.
+- `hc counters` (`GET /counters`) kept listing the objects of a
+  configuration replaced since housecarld started (`hc import
+  --replace` gives every object a new ID), beside the current ones; the
+  totals of objects that no longer exist are now forgotten.
 - Import: two base chains on one hook had their rules imported twice,
   and the second chain's leading built-ins were moved above the first
   chain's rules; they now follow each other by priority (read in a

Makefile

@@ -112,6 +112,7 @@ install-files:
 	install -D -m 0644 CHANGELOG.md $(DESTDIR)$(DOCDIR)/CHANGELOG.md
 	install -d $(DESTDIR)$(DOCDIR)/docs
 	install -m 0644 docs/*.md $(DESTDIR)$(DOCDIR)/docs/
+	install -D -m 0644 contrib/fail2ban/action.d/housecarl.conf $(DESTDIR)$(DOCDIR)/contrib/fail2ban/action.d/housecarl.conf
 
 uninstall:
 	rm -f $(DESTDIR)$(BINDIR)/housecarld $(DESTDIR)$(BINDIR)/hc $(DESTDIR)$(UNITDIR)/housecarl.service \

README.md

@@ -53,6 +53,10 @@ table of its own.
   firewall you have, blocking nothing: its hits, log and tracer show what
   it would drop, so you see what switching over would break before you do
   ([docs/shadow.md](docs/shadow.md)).
+* **Ban lists for Guard and fail2ban.** A program on any machine bans an
+  address it caught misbehaving in its logs, and the ban list says what
+  that address is kept from: the firewall, some hosts, or everything
+  ([docs/bans.md](docs/bans.md)).
 * **Easy to watch.** A zone matrix of what is allowed between zones,
   statistics over time (traffic per zone and device, drops, the sources
   blocked most, connections; [docs/stats.md](docs/stats.md)), hits per rule, a live log of what was dropped and
@@ -107,6 +111,7 @@ The web UI is on `http://127.0.0.1:8070/` (see `listen` in
 * [install.md](docs/install.md): packages, building from source, first steps
 * [rules.md](docs/rules.md): zones, address sets, services, rules and the built-ins
 * [nat.md](docs/nat.md): port forwards, hairpin NAT, IPv6 pinholes, source NAT, redirects
+* [bans.md](docs/bans.md): ban lists, where Guard and fail2ban ban addresses
 * [import.md](docs/import.md): moving from an existing nftables ruleset
 * [shadow.md](docs/shadow.md): shadow mode, Housecarl beside your firewall, changing nothing
 * [operations.md](docs/operations.md): probation, the boot and its fallback, hits and the log, monitoring, backups, troubleshooting
@@ -123,14 +128,15 @@ The web UI is on `http://127.0.0.1:8070/` (see `listen` in
 
 ## Status
 
-Housecarl 0.1.1 is in testing (0.1.1-rc.2): zones, address sets and
+Housecarl 0.2.0 is in testing (0.2.0-rc.4+git68-b4c0988): zones, address sets and
 services with ordered rules, IPv4 and IPv6, port forwards with hairpin NAT
 and IPv6 pinholes, source NAT and redirects, built-ins, probation for
 network changes (confirmed by the client that made them), the ruleset
 at boot with a fail-closed fallback, hits and the drop log, nftables
 import, changesets reviewed with the ruleset's diff (as in Jarl),
-bandwidth limits and quotas, shadow mode beside another firewall, a web
-UI, REST API and CLI.
+bandwidth limits and quotas, shadow mode beside another firewall, ban
+lists for Guard and fail2ban, sets of names from Jarl, a web UI, REST
+API and CLI.
 
 ## Licence
 

VERSION

@@ -1 +1 @@
-0.1.1-rc.2
+0.2.0-rc.4+git68-b4c0988

cmd/hc/admin.go

@@ -66,6 +66,30 @@ func historyCmd() *cobra.Command {
 			})
 		},
 	})
+	cmd.AddCommand(&cobra.Command{
+		Use: "diff ID", Short: "Show what a change did to the ruleset", Args: cobra.ExactArgs(1),
+		Long: `Shows the ruleset's diff for a change: the configuration before and after
+it, rendered by this version of Housecarl.`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			var d struct {
+				Diff string `json:"diff"`
+			}
+			if err := c.Get(ctx(), "/history/"+args[0]+"/diff", nil, &d); err != nil {
+				return err
+			}
+			return output(d, func(w io.Writer) {
+				if d.Diff == "" {
+					fmt.Fprintln(w, "the ruleset didn't change")
+					return
+				}
+				printDiff(w, d.Diff)
+			})
+		},
+	})
 	cmd.AddCommand(&cobra.Command{
 		Use:   "undo ID",
 		Short: "Undo a change",
@@ -88,11 +112,13 @@ change touched has changed since; undo the later changes first.`,
 }
 
 // diffJSON lists the fields that differ between two versions of an
-// object: "name: office -> lab".
+// object: "name: office -> lab". An object within (settings' builtins)
+// is compared field by field: "builtins.drop_invalid: false -> true".
 func diffJSON(before, after json.RawMessage) []string {
 	var a, b map[string]any
 	json.Unmarshal(before, &a)
 	json.Unmarshal(after, &b)
+	a, b = flatten(a, "", map[string]any{}), flatten(b, "", map[string]any{})
 	keys := map[string]bool{}
 	for k := range a {
 		keys[k] = true
@@ -132,6 +158,19 @@ func diffJSON(before, after json.RawMessage) []string {
 	return out
 }
 
+// flatten lifts the fields of objects within m to dotted keys; lists
+// stay whole.
+func flatten(m map[string]any, prefix string, out map[string]any) map[string]any {
+	for k, v := range m {
+		if o, ok := v.(map[string]any); ok && len(o) > 0 {
+			flatten(o, prefix+k+".", out)
+		} else {
+			out[prefix+k] = v
+		}
+	}
+	return out
+}
+
 func whoamiCmd() *cobra.Command {
 	return &cobra.Command{
 		Use: "whoami", Short: "Show who you are to the server", Args: cobra.NoArgs,
@@ -310,9 +349,13 @@ operator, log) or grants such as --grant config:read --grant sets:write:guests.
 	f.BoolVar(&enable, "enable", false, "enable the user again")
 	f.StringVar(&comment, "comment", "", "a comment")
 	cmd.AddCommand(update)
-	cmd.AddCommand(&cobra.Command{
+	var yes bool
+	del := &cobra.Command{
 		Use: "delete USER", Short: "Delete a user and their tokens", Args: cobra.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if !confirm(fmt.Sprintf("Delete user %s and their tokens?", args[0]), yes) {
+				return fmt.Errorf("not deleted")
+			}
 			id, err := userID(args[0])
 			if err != nil {
 				return err
@@ -326,7 +369,9 @@ operator, log) or grants such as --grant config:read --grant sets:write:guests.
 			}
 			return nil
 		},
-	})
+	}
+	del.Flags().BoolVarP(&yes, "yes", "y", false, "don't ask")
+	cmd.AddCommand(del)
 	return cmd
 }
 

cmd/hc/bans.go

@@ -0,0 +1,313 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/url"
+	"strconv"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"housecarl/internal/api"
+	"housecarl/internal/model"
+)
+
+// ---- ban lists (docs/bans.md)
+
+// banTime writes a ban list's time setting: 0 is the default, -1 none.
+func banTime(n int, def string) string {
+	switch {
+	case n < 0:
+		return "no limit"
+	case n == 0:
+		return def + " (default)"
+	}
+	return fmtSeconds(n)
+}
+
+// parseBanTime reads a time flag: a duration, or "none" (-1) for no
+// limit.
+func parseBanTime(s string) (int, error) {
+	if strings.EqualFold(s, "none") || s == "-1" {
+		return -1, nil
+	}
+	return parseSeconds(s)
+}
+
+func banlistCmd() *cobra.Command {
+	cmd := &cobra.Command{Use: "banlist", Aliases: []string{"banlists"}, Short: "Ban lists: where Guard and fail2ban ban addresses"}
+	cmd.AddCommand(&cobra.Command{
+		Use: "list", Short: "List the ban lists", Args: cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			bs, err := get[[]model.BanList]("/banlists", nil)
+			if err != nil {
+				return err
+			}
+			bans, _ := get[[]model.Ban]("/bans", nil)
+			count := map[int64]int{}
+			for _, b := range bans {
+				count[b.ListID]++
+			}
+			return output(bs, func(w io.Writer) {
+				fmt.Fprintln(w, "NAME\tSCOPE\tHOSTS\tBANS\tCOMMENT")
+				for _, b := range bs {
+					scope := b.Scope
+					if b.Disabled {
+						scope += " (disabled)"
+					}
+					fmt.Fprintf(w, "%s\t%s\t%s\t%d\t%s\n", b.Name, scope, list(b.Hosts), count[b.ID], b.Comment)
+				}
+			})
+		},
+	})
+	cmd.AddCommand(showCmd("banlists", "banlist", func(w io.Writer, b model.BanList) {
+		fmt.Fprintf(w, "Name:\t%s\nScope:\t%s\n", b.Name, b.Scope)
+		if len(b.Hosts) > 0 {
+			fmt.Fprintf(w, "Hosts:\t%s\n", list(b.Hosts))
+		}
+		fmt.Fprintf(w, "Never:\t%s\n", list(b.Never))
+		fmt.Fprintf(w, "Ban time:\t%s\nLongest:\t%s\n", banTime(b.DefaultTime, "1h"), banTime(b.MaxTime, "7d"))
+		fmt.Fprintf(w, "Most bans:\t%d\nIPv6 banned by:\t/%d\n", b.Entries(), b.V6Group())
+		if b.Disabled {
+			fmt.Fprintln(w, "Disabled:\tyes")
+		}
+		if b.Comment != "" {
+			fmt.Fprintf(w, "Comment:\t%s\n", b.Comment)
+		}
+	}))
+	var scope, comment, banT, maxT string
+	var hosts, never []string
+	var entries, group int
+	var disabled bool
+	setFields := func(fl interface{ Changed(string) bool }, p patch) error {
+		if fl.Changed("scope") {
+			p["scope"] = scope
+		}
+		if fl.Changed("host") {
+			p["hosts"] = hosts
+		}
+		if fl.Changed("never") {
+			p["never"] = never
+		}
+		for _, t := range []struct{ flag, field, v string }{{"time", "default_time", banT}, {"max-time", "max_time", maxT}} {
+			if fl.Changed(t.flag) {
+				n, err := parseBanTime(t.v)
+				if err != nil {
+					return err
+				}
+				p[t.field] = n
+			}
+		}
+		if fl.Changed("max-entries") {
+			p["max_entries"] = entries
+		}
+		if fl.Changed("group-v6") {
+			p["group_v6"] = group
+		}
+		if fl.Changed("comment") {
+			p["comment"] = comment
+		}
+		if fl.Changed("disabled") {
+			p["disabled"] = disabled
+		}
+		return nil
+	}
+	flags := func(c *cobra.Command) {
+		f := c.Flags()
+		f.StringVar(&scope, "scope", "", "what bans keep addresses from: firewall, hosts or everything")
+		f.StringArrayVar(&hosts, "host", nil, "scope hosts: a machine's address, or a set (repeat)")
+		f.StringArrayVar(&never, "never", nil, "an address, prefix or set never banned (repeat)")
+		f.StringVar(&banT, "time", "", "a ban's length when none is asked for (default 1h)")
+		f.StringVar(&maxT, "max-time", "", "the longest ban (default 7d; none for no limit)")
+		f.IntVar(&entries, "max-entries", 0, "the most bans the list holds (default 10000)")
+		f.IntVar(&group, "group-v6", 0, "IPv6 prefix length banned for an address (default 64)")
+		f.StringVar(&comment, "comment", "", "a comment")
+		f.BoolVar(&disabled, "disabled", false, "the list's bans aren't in force")
+	}
+	add := &cobra.Command{
+		Use: "add NAME", Short: "Add a ban list", Args: cobra.ExactArgs(1),
+		Long: `Adds a ban list. A program bans an address into it (Guard, fail2ban's
+housecarl action, hc ban), and the list says what that address is kept
+from:
+
+  hc banlist add router --scope firewall                  # the firewall itself
+  hc banlist add web --scope hosts --host 10.0.10.57 --host 2001:db8:10::57
+  hc banlist add edge --scope everything --never trusted
+
+Give the program a token for its list alone:
+
+  hc user add guard-web --no-password --grant bans:write:web
+  hc token create web1 --user guard-web     # as root on the firewall`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			p := patch{"name": args[0]}
+			if err := setFields(cmd.Flags(), p); err != nil {
+				return err
+			}
+			return change("POST", "/banlists", p)
+		},
+	}
+	flags(add)
+	cmd.AddCommand(add)
+	update := &cobra.Command{
+		Use: "update BANLIST", Short: "Change a ban list", Args: cobra.ExactArgs(1),
+		Long: `Changes a ban list; --host and --never replace the lists. A ban list
+can't be renamed: tokens and programs know it by its name.`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			p := patch{}
+			if err := setFields(cmd.Flags(), p); err != nil {
+				return err
+			}
+			return change("PATCH", objPath("banlists", args[0]), p)
+		},
+	}
+	flags(update)
+	cmd.AddCommand(update)
+	cmd.AddCommand(deleteCmd("banlists", "banlist"))
+	return cmd
+}
+
+// bansCmd lists the active bans.
+func bansCmd() *cobra.Command {
+	return &cobra.Command{
+		Use: "bans [BANLIST]", Short: "List the active bans", Args: cobra.MaximumNArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			path := "/bans"
+			if len(args) == 1 {
+				path = objPath("banlists", args[0]) + "/bans"
+			}
+			bans, err := get[[]model.Ban](path, nil)
+			if err != nil {
+				return err
+			}
+			return output(bans, func(w io.Writer) {
+				fmt.Fprintln(w, "ID\tLIST\tADDRESS\tPORT\tENDS IN\tBY\tSOURCE\tREASON")
+				for _, b := range bans {
+					port := "all"
+					if b.Protocol != "" {
+						port = fmt.Sprintf("%s/%d", b.Protocol, b.Port)
+					}
+					fmt.Fprintf(w, "%d\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n", b.ID, b.List, b.Address, port, fmtSeconds(b.Timeout), b.Who, orDash(b.Source), orDash(clipText(b.Reason, 60)))
+				}
+			})
+		},
+	}
+}
+
+func clipText(s string, n int) string {
+	if len(s) > n {
+		return s[:n-1] + "…"
+	}
+	return s
+}
+
+// banCmd bans an address by hand.
+func banCmd() *cobra.Command {
+	var tcp, udp []string
+	var t, reason string
+	cmd := &cobra.Command{
+		Use: "ban BANLIST ADDRESS", Short: "Ban an address", Args: cobra.ExactArgs(2),
+		Long: `Bans an address in a ban list: every port, or with --tcp and --udp some
+(numbers or service names). IPv6 addresses are banned with the list's
+grouping (a /64 unless set otherwise).
+
+  hc ban edge 203.0.113.9 --time 1d
+  hc ban web 203.0.113.9 --tcp ssh --tcp 8443 --reason "tried passwords"`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			in := api.BanInput{Address: args[1], Reason: reason, Source: "hc"}
+			if t != "" {
+				n, err := parseBanTime(t)
+				if err != nil {
+					return err
+				}
+				in.Time = n
+			}
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			var out api.BanResult
+			do := func(proto string, ports []string) error {
+				in.Protocol = proto
+				in.Ports = nil
+				if len(ports) > 0 {
+					in.Ports = []byte(strconv.Quote(strings.Join(ports, ",")))
+				}
+				var res api.BanResult
+				if err := c.Do(ctx(), "POST", objPath("banlists", args[0])+"/bans", nil, in, &res); err != nil {
+					return err
+				}
+				out.Bans = append(out.Bans, res.Bans...)
+				out.Closed += res.Closed
+				return nil
+			}
+			switch {
+			case len(tcp) == 0 && len(udp) == 0:
+				err = do("", nil)
+			default:
+				if len(tcp) > 0 {
+					err = do("tcp", tcp)
+				}
+				if err == nil && len(udp) > 0 {
+					err = do("udp", udp)
+				}
+			}
+			if err != nil {
+				return err
+			}
+			return output(out, func(w io.Writer) {
+				for _, b := range out.Bans {
+					what := "banned"
+					if b.Existing {
+						what = "renewed"
+					}
+					port := "every port"
+					if b.Protocol != "" {
+						port = fmt.Sprintf("%s/%d", b.Protocol, b.Port)
+					}
+					ends := "never ends"
+					if b.Timeout > 0 {
+						ends = "ends in " + fmtSeconds(b.Timeout)
+					}
+					fmt.Fprintf(w, "%s %s, %s, in %s (%s)\n", what, b.Address, port, b.List, ends)
+				}
+				if out.Closed > 0 {
+					fmt.Fprintf(w, "%d connections closed\n", out.Closed)
+				}
+			})
+		},
+	}
+	f := cmd.Flags()
+	f.StringArrayVar(&tcp, "tcp", nil, "ban only this TCP port or service (repeat)")
+	f.StringArrayVar(&udp, "udp", nil, "ban only this UDP port or service (repeat)")
+	f.StringVar(&t, "time", "", "how long (1h, 7d; default the list's; none for ever, if the list allows)")
+	f.StringVar(&reason, "reason", "", "why, for the record")
+	return cmd
+}
+
+// unbanCmd lifts bans: by ID, or every ban of an address.
+func unbanCmd() *cobra.Command {
+	return &cobra.Command{
+		Use: "unban BANLIST ADDRESS|ID", Short: "Lift a ban, or all of an address's", Args: cobra.ExactArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			path, query := objPath("banlists", args[0])+"/bans", url.Values{}
+			if _, err := strconv.ParseInt(args[1], 10, 64); err == nil {
+				path += "/" + args[1]
+			} else {
+				query.Set("address", args[1])
+			}
+			var out map[string]int
+			if err := c.Do(ctx(), "DELETE", path, query, nil, &out); err != nil {
+				return err
+			}
+			if !flagQuiet {
+				fmt.Printf("%d bans lifted\n", out["removed"])
+			}
+			return nil
+		},
+	}
+}

cmd/hc/firewall.go

@@ -298,6 +298,13 @@ func quotasCmd() *cobra.Command {
 			if err != nil {
 				return err
 			}
+			var addrs []string
+			for _, q := range qs {
+				for _, a := range q.Addresses {
+					addrs = append(addrs, a.Address)
+				}
+			}
+			names := lookupNames(addrs...)
 			return output(qs, func(w io.Writer) {
 				fmt.Fprintln(w, "RULE\tUSED\tOF\tRESETS\tNEXT RESET")
 				for _, q := range qs {
@@ -315,9 +322,13 @@ func quotasCmd() *cobra.Command {
 					if q.Quota.PerSource || q.Quota.PerDestination {
 						of += " each"
 					}
-					fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\n", q.Rule, humanBytes(q.Used), of, resets, next)
+					used := humanBytes(q.Used)
+					if !q.Quota.PerSource && !q.Quota.PerDestination {
+						used += " (" + percent(q.Used, q.Quota.Bytes) + ")"
+					}
+					fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\n", q.Rule, used, of, resets, next)
 					for _, a := range q.Addresses {
-						fmt.Fprintf(w, "  %s\t%s\t\t\t\n", a.Address, humanBytes(a.Used))
+						fmt.Fprintf(w, "  %s\t%s (%s)\t\t\t\n", named(names, a.Address, a.Address), humanBytes(a.Used), percent(a.Used, q.Quota.Bytes))
 					}
 				}
 			})
@@ -325,6 +336,17 @@ func quotasCmd() *cobra.Command {
 	}
 }
 
+// percent writes used as a share of total: "25%", "<1%" for a little.
+func percent(used, total int64) string {
+	if total <= 0 || used <= 0 {
+		return "0%"
+	}
+	if used*100 < total {
+		return "<1%"
+	}
+	return fmt.Sprintf("%d%%", used*100/total)
+}
+
 func logCmd() *cobra.Command {
 	var follow bool
 	var limit int
@@ -341,6 +363,11 @@ func logCmd() *cobra.Command {
 			var last time.Time
 			print := func(es []api.LogEntry) {
 				sort.Slice(es, func(i, j int) bool { return es[i].Time.Before(es[j].Time) })
+				var addrs []string
+				for _, e := range es {
+					addrs = append(addrs, e.Source, e.Dest)
+				}
+				names := lookupNames(addrs...)
 				for _, e := range es {
 					last = e.Time
 					src, dst := e.Source, e.Dest
@@ -350,6 +377,7 @@ func logCmd() *cobra.Command {
 					if e.DestPort != 0 {
 						dst = joinPort(dst, e.DestPort)
 					}
+					src, dst = named(names, e.Source, src), named(names, e.Dest, dst)
 					what := e.Protocol
 					if e.ICMPType != "" {
 						what += " " + e.ICMPType

cmd/hc/main.go

@@ -46,6 +46,7 @@ var (
 	flagCACert    string
 	flagQuiet     bool
 	flagNoConfirm bool
+	flagNoNames   bool
 	// lastClient is the client the command made (to confirm a change by
 	// itself after it).
 	lastClient *client.Client
@@ -182,6 +183,7 @@ Exit codes: 0 ok, 1 error, 3 not authenticated or not allowed, 4 not found,
 	pf.StringVar(&flagCACert, "ca-cert", "", "PEM file with a CA to trust for the server's certificate")
 	pf.BoolVarP(&flagQuiet, "quiet", "q", false, "print only errors (and IDs of new objects)")
 	pf.BoolVar(&flagNoConfirm, "no-confirm", false, "leave a change on probation instead of confirming it once this client reaches Housecarl again")
+	pf.BoolVar(&flagNoNames, "no-names", false, "show inside addresses without their names (reverse lookups)")
 	pf.Int64VarP(&flagChangeset, "changeset", "C", 0, "stage configuration changes in this changeset instead of applying them (env HOUSECARL_CHANGESET)")
 	root.AddGroup(&cobra.Group{ID: "fw", Title: "Firewall:"}, &cobra.Group{ID: "changes", Title: "Changes:"}, &cobra.Group{ID: "admin", Title: "Administration:"})
 	add := func(group string, cmds ...*cobra.Command) {
@@ -190,7 +192,7 @@ Exit codes: 0 ok, 1 error, 3 not authenticated or not allowed, 4 not found,
 			root.AddCommand(c)
 		}
 	}
-	add("fw", statusCmd(), zoneCmd(), setCmd(), serviceCmd(), ruleCmd(), forwardCmd(), snatCmd(), redirectCmd(), settingsCmd(),
+	add("fw", statusCmd(), zoneCmd(), setCmd(), serviceCmd(), ruleCmd(), forwardCmd(), snatCmd(), redirectCmd(), banlistCmd(), bansCmd(), banCmd(), unbanCmd(), settingsCmd(),
 		rulesetCmd(), countersCmd(), quotasCmd(), logCmd(), connectionsCmd(), traceCmd(), matrixCmd(), statsCmd(), interfaceCmd())
 	add("changes", changesetCmd(), confirmCmd(), rollbackCmd(), historyCmd(), importCmd(), takeoverCmd())
 	add("admin", whoamiCmd(), userCmd(), tokenCmd(), passwordCmd(), certCmd(), auditCmd(), configCmd())

cmd/hc/main_test.go

@@ -1,8 +1,11 @@
 package main
 
 import (
+	"regexp"
+	"strings"
 	"testing"
 
+	"housecarl/internal/matrix"
 	"housecarl/internal/model"
 )
 
@@ -32,11 +35,53 @@ func TestLimitAndDescribe(t *testing.T) {
 	if _, err := parseLimit("fast"); err == nil {
 		t.Error("a bad limit accepted")
 	}
-	m := model.Match{InZones: []string{"wan"}, NotSources: true, Sources: []string{"trusted"}, Services: []string{"ssh", "tcp/8080"}}
-	if got := describe(m); got != "in wan  from not trusted  ssh,tcp/8080" {
-		t.Errorf("describe: %q", got)
+	for _, c := range []struct {
+		m     model.Match
+		chain string
+		want  string
+	}{
+		{model.Match{InZones: []string{"wan"}, NotSources: true, Sources: []string{"trusted"}, Services: []string{"ssh", "tcp/8080"}}, "input",
+			"wan → firewall  from any but trusted  ssh,tcp/8080"},
+		{model.Match{InZones: []string{"wan"}, NotIn: true, Destinations: []string{"trusted_ips"}}, "forward", "any but wan → any  to trusted_ips"},
+		{model.Match{InZones: []string{"lan"}, OutZones: []string{"wan"}}, "forward", "lan → wan"},
+		{model.Match{OutZones: []string{"wan"}}, "output", "firewall → wan"},
+		{model.Match{OutZones: []string{"wan"}, Sources: []string{"10.0.0.0/8"}}, "", "any → wan  from 10.0.0.0/8"},
+		{model.Match{Sources: []string{"trusted"}}, "input", "from trusted"},
+		{model.Match{}, "forward", "everything"},
+	} {
+		if got := describe(c.m, c.chain); got != c.want {
+			t.Errorf("describe(%+v, %s) = %q, want %q", c.m, c.chain, got, c.want)
+		}
+	}
+	for used, want := range map[int64]string{0: "0%", 5: "<1%", 250: "25%", 1000: "100%", 1300: "130%"} {
+		if got := percent(used, 1000); got != want {
+			t.Errorf("percent(%d, 1000) = %q, want %q", used, got, want)
+		}
 	}
 	if got := editList([]string{"a", "b", "c"}, []string{"d"}, []string{"b"}); len(got) != 3 || got[1] != "c" || got[2] != "d" {
 		t.Errorf("editList: %v", got)
 	}
 }
+
+// TestMatrixAligned: the grid's columns line up in colour too (the
+// escape codes take no room on screen).
+func TestMatrixAligned(t *testing.T) {
+	st := model.NewState()
+	st.Zones = []*model.Zone{{ID: 1, Name: "lan", Interfaces: []string{"eth1"}}, {ID: 2, Name: "wan", Interfaces: []string{"wan"}, External: true}}
+	st.Rules = []*model.Rule{{ID: 3, Chain: model.ChainForward, Position: 1, Action: model.ActionAccept, Match: model.Match{InZones: []string{"lan"}, Services: []string{"https"}}}}
+	st.Settings.InputPolicy, st.Settings.ForwardPolicy = model.PolicyDrop, model.PolicyDrop
+	var b strings.Builder
+	writeMatrix(&b, matrix.Build(st), true)
+	esc := regexp.MustCompile("\x1b\\[[0-9]+m")
+	lines := strings.Split(esc.ReplaceAllString(b.String(), ""), "\n")
+	col := strings.Index(lines[0], "wan")
+	for _, l := range lines[1:4] {
+		if r := []rune(l); len(r) <= col || r[col-1] != ' ' || r[col] == ' ' {
+			t.Errorf("misaligned at column %d:\n%s", col, strings.Join(lines[:4], "\n"))
+			break
+		}
+	}
+	if !strings.Contains(b.String(), "\x1b[33mpartly +1") || !strings.Contains(b.String(), "lan → wan\thttps") {
+		t.Errorf("no partly cell, or no list of what's open:\n%s", b.String())
+	}
+}

cmd/hc/objects.go

@@ -49,6 +49,46 @@ func counters() map[string]api.Counter {
 	return cs.Counters
 }
 
+// lookupNames asks for inside addresses' names, for tables: none with
+// --no-names, another output format, or when they can't be had.
+func lookupNames(addrs ...string) map[string]string {
+	out := map[string]string{}
+	if flagNoNames || flagOutput != "table" {
+		return out
+	}
+	seen := map[string]bool{}
+	var list []string
+	for _, a := range addrs {
+		if a != "" && !seen[a] {
+			seen[a] = true
+			list = append(list, a)
+		}
+	}
+	if len(list) == 0 {
+		return out
+	}
+	c, err := newClient()
+	if err != nil {
+		return out
+	}
+	var ns api.Names
+	if c.Do(ctx(), "POST", "/names", nil, api.NamesInput{Addresses: list}, &ns) != nil {
+		return out
+	}
+	for a, n := range ns.Names {
+		out[a] = strings.SplitN(n, ".", 2)[0]
+	}
+	return out
+}
+
+// named adds an address's name to text (the address, or address:port).
+func named(names map[string]string, addr, text string) string {
+	if n := names[addr]; n != "" {
+		return text + " (" + n + ")"
+	}
+	return text
+}
+
 func hits(c map[string]api.Counter, marks ...string) string {
 	var p uint64
 	found := false
@@ -231,6 +271,9 @@ func setCmd() *cobra.Command {
 				fmt.Fprintln(w, "NAME\tENTRIES\tCOMMENT")
 				for _, s := range ss {
 					entries := list(s.Entries)
+					if s.Jarl != nil {
+						entries = "from Jarl: " + strings.Join(jarlNames(s.Jarl), ", ")
+					}
 					if s.Dynamic {
 						entries = "dynamic"
 						if s.Timeout > 0 {
@@ -250,6 +293,11 @@ func setCmd() *cobra.Command {
 				fmt.Fprintf(w, "Timeout:\t%s\n", fmtSeconds(s.Timeout))
 			}
 		}
+		if s.Jarl != nil {
+			fmt.Fprintf(w, "From Jarl:\t%s\n", strings.Join(jarlNames(s.Jarl), ", "))
+			fmt.Fprintf(w, "Within:\t%s\n", strings.Join(s.Jarl.Within, ", "))
+			fmt.Fprintf(w, "Addresses:\thc set jarl %s\n", s.Name)
+		}
 		for i, e := range s.Entries {
 			label := ""
 			if i == 0 {
@@ -263,18 +311,29 @@ func setCmd() *cobra.Command {
 	}))
 	var dynamic bool
 	var timeout, comment string
+	var jarlN, within []string
 	add := &cobra.Command{
 		Use: "add NAME [ENTRY...]", Short: "Add a set", Args: cobra.MinimumNArgs(1),
 		Long: `Adds a set of addresses, prefixes and ranges, IPv4 and IPv6 mixed:
 
   hc set add trusted 192.168.1.0/24 192.168.2.0/24 2001:db8:1::/64
   hc set add guests --dynamic --timeout 24h
+  hc set add nas --jarl nas.example.com@internal --within lan
 
 A dynamic set takes entries at run time, each with its own timeout ('hc
 set entries', or the API with a token for that set alone: a captive
-portal's signed-in clients).`,
+portal's signed-in clients).
+
+A Jarl set holds the addresses of names in Jarl (their A and AAAA
+records, CNAMEs followed), read again every minute. --jarl takes
+NAME@VIEW, or NAME when only one view has it; --within says where its
+addresses may be (zones: their connected networks; or networks), and the
+others are left out ('hc set jarl NAME' shows them). docs/jarl.md.`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			s := model.AddressSet{Name: args[0], Entries: args[1:], Dynamic: dynamic, Comment: comment}
+			if len(jarlN) > 0 || len(within) > 0 {
+				s.Jarl = jarlSource(jarlN, within)
+			}
 			if timeout != "" {
 				n, err := parseSeconds(timeout)
 				if err != nil {
@@ -287,6 +346,8 @@ portal's signed-in clients).`,
 	}
 	add.Flags().BoolVar(&dynamic, "dynamic", false, "entries are added at run time")
 	add.Flags().StringVar(&timeout, "timeout", "", "a dynamic set's default entry lifetime (1h, 7d)")
+	add.Flags().StringArrayVar(&jarlN, "jarl", nil, "a name in Jarl whose addresses the set holds: NAME or NAME@VIEW (repeat)")
+	add.Flags().StringArrayVar(&within, "within", nil, "a Jarl set: a zone or network its addresses must lie in (repeat)")
 	add.Flags().StringVar(&comment, "comment", "", "a comment")
 	cmd.AddCommand(add)
 	var addE, removeE, entries []string
@@ -310,6 +371,23 @@ portal's signed-in clients).`,
 				}
 				p["entries"] = editList(cur, addE, removeE)
 			}
+			if fl.Changed("jarl") || fl.Changed("within") {
+				s, err := get[model.AddressSet](objPath("sets", args[0]), nil)
+				if err != nil {
+					return err
+				}
+				j := s.Jarl
+				if j == nil {
+					j = &model.JarlSource{}
+				}
+				if fl.Changed("jarl") {
+					j.Names = jarlSource(jarlN, nil).Names
+				}
+				if fl.Changed("within") {
+					j.Within = within
+				}
+				p["jarl"] = j
+			}
 			if fl.Changed("timeout") {
 				n, err := parseSeconds(timeout)
 				if err != nil {
@@ -331,11 +409,104 @@ portal's signed-in clients).`,
 	f.StringArrayVar(&addE, "add", nil, "add an entry")
 	f.StringArrayVar(&removeE, "remove", nil, "remove an entry")
 	f.StringVar(&timeout, "timeout", "", "a dynamic set's default entry lifetime")
+	f.StringArrayVar(&jarlN, "jarl", nil, "replace a Jarl set's names: NAME or NAME@VIEW (repeat)")
+	f.StringArrayVar(&within, "within", nil, "replace where a Jarl set's addresses may be: zones, networks (repeat)")
 	f.StringVar(&comment, "comment", "", "a comment")
 	f.StringVar(&name, "name", "", "a new name")
 	cmd.AddCommand(update)
 	cmd.AddCommand(deleteCmd("sets", "set"))
 	cmd.AddCommand(entriesCmd())
+	cmd.AddCommand(jarlCmd())
+	return cmd
+}
+
+func jarlSource(names, within []string) *model.JarlSource {
+	j := &model.JarlSource{Names: []model.JarlName{}, Within: within}
+	for _, n := range names {
+		j.Names = append(j.Names, model.ParseJarlName(n))
+	}
+	return j
+}
+
+func jarlNames(j *model.JarlSource) []string {
+	var out []string
+	for _, n := range j.Names {
+		out = append(out, n.String())
+	}
+	return out
+}
+
+// jarlCmd shows what a Jarl set holds, name by name.
+func jarlCmd() *cobra.Command {
+	var refresh bool
+	cmd := &cobra.Command{Use: "jarl SET", Short: "What a Jarl set holds: each name's addresses in Jarl, and which are used", Args: cobra.ExactArgs(1),
+		Long: `Shows a Jarl set's names with the addresses Jarl gives them (CNAMEs
+followed), whether each is used or why it is left out (not within the
+set's zones and networks), and when Jarl last answered. --refresh reads
+Jarl first.`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newClient()
+			if err != nil {
+				return err
+			}
+			var js api.JarlSet
+			if refresh {
+				err = c.Do(ctx(), "POST", objPath("sets", args[0])+"/jarl/refresh", nil, nil, &js)
+			} else {
+				err = c.Do(ctx(), "GET", objPath("sets", args[0])+"/jarl", nil, nil, &js)
+			}
+			if err != nil {
+				return err
+			}
+			return output(js, func(w io.Writer) {
+				if !js.Configured {
+					fmt.Fprintln(w, "Jarl isn't configured (jarl.server in housecarl.yaml): the set keeps the addresses it last had.")
+				}
+				if js.Error != "" {
+					fmt.Fprintf(w, "Reading Jarl failed: %s (the set keeps the addresses it had)\n", js.Error)
+				}
+				fmt.Fprintf(w, "Set:\t%s\n", js.Set)
+				fmt.Fprintf(w, "Within:\t%s\n", strings.Join(js.Within, ", "))
+				fmt.Fprintf(w, "Holds:\t%s\n", list(js.Entries))
+				if js.Read != nil {
+					fmt.Fprintf(w, "Jarl read:\t%s\n", js.Read.Local().Format("2006-01-02 15:04:05"))
+				}
+				fmt.Fprintln(w)
+				fmt.Fprintln(w, "NAME\tVIEW\tADDRESS\tUSED")
+				for _, n := range js.Names {
+					label := n.Name
+					if len(n.Chain) > 0 {
+						label += " → " + strings.Join(n.Chain, " → ")
+					}
+					view := n.View
+					if view == "" {
+						view = n.Found
+					}
+					if view == "" {
+						view = "-"
+					}
+					switch {
+					case n.Problem != "":
+						fmt.Fprintf(w, "%s\t%s\t-\tno: %s\n", label, view, n.Problem)
+					case len(n.Addresses) == 0 && n.Error != "":
+						fmt.Fprintf(w, "%s\t%s\t-\tnot read: %s\n", label, view, n.Error)
+					case len(n.Addresses) == 0:
+						fmt.Fprintf(w, "%s\t%s\t-\tnot read yet\n", label, view)
+					}
+					for _, a := range n.Addresses {
+						used := "yes"
+						if !a.Used {
+							used = "no: " + a.Why
+						}
+						fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", label, view, a.Address, used)
+					}
+					if n.Error != "" && len(n.Addresses) > 0 {
+						fmt.Fprintf(w, "%s\t%s\t\t(the last read failed: %s; these are from before)\n", label, view, n.Error)
+					}
+				}
+			})
+		}}
+	cmd.Flags().BoolVar(&refresh, "refresh", false, "read Jarl now")
 	return cmd
 }
 

cmd/hc/rules.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"io"
+	"net/url"
 	"regexp"
 	"strconv"
 	"strings"
@@ -63,22 +64,40 @@ func (m *matchFlags) patch(fl *pflag.FlagSet, p patch) {
 	set("family", "family", m.family)
 }
 
-// describe sums up a match: "in lan  from trusted  ssh, dns".
-func describe(m model.Match) string {
+// describe sums up a match in a chain ("" for NAT): "lan → firewall
+// from trusted  ssh,dns". Zones are a direction; the firewall itself is
+// the other end of the input and output chains.
+func describe(m model.Match, chain string) string {
 	var parts []string
-	side := func(word string, not bool, list []string) {
-		if len(list) == 0 {
-			return
-		}
+	list := func(not bool, xs []string) string {
+		s := strings.Join(xs, ",")
 		if not {
-			word += " not"
+			return "any but " + s
 		}
-		parts = append(parts, word+" "+strings.Join(list, ","))
+		return s
+	}
+	if len(m.InZones) > 0 || len(m.OutZones) > 0 {
+		in, out := "any", "any"
+		if len(m.InZones) > 0 {
+			in = list(m.NotIn, m.InZones)
+		}
+		if len(m.OutZones) > 0 {
+			out = list(m.NotOut, m.OutZones)
+		}
+		switch chain {
+		case model.ChainInput:
+			out = "firewall"
+		case model.ChainOutput:
+			in = "firewall"
+		}
+		parts = append(parts, in+" → "+out)
+	}
+	if len(m.Sources) > 0 {
+		parts = append(parts, "from "+list(m.NotSources, m.Sources))
+	}
+	if len(m.Destinations) > 0 {
+		parts = append(parts, "to "+list(m.NotDests, m.Destinations))
 	}
-	side("in", m.NotIn, m.InZones)
-	side("out", m.NotOut, m.OutZones)
-	side("from", m.NotSources, m.Sources)
-	side("to", m.NotDests, m.Destinations)
 	if len(m.Services) > 0 {
 		parts = append(parts, strings.Join(m.Services, ","))
 	}
@@ -280,7 +299,7 @@ func ruleCmd() *cobra.Command {
 			return output(rs, func(w io.Writer) {
 				fmt.Fprintln(w, "CHAIN\tID\tMATCH\tACTION\tHITS\tCOMMENT")
 				for _, r := range rs {
-					what := describe(r.Match)
+					what := describe(r.Match, r.Chain)
 					if r.Raw != "" {
 						what = "raw: " + r.Raw
 					}
@@ -303,7 +322,7 @@ func ruleCmd() *cobra.Command {
 	cmd.AddCommand(ls)
 	cmd.AddCommand(showCmd("rules", "rule", func(w io.Writer, r model.Rule) {
 		if r.Raw == "" {
-			fmt.Fprintf(w, "ID:\t%d\nChain:\t%s\nMatch:\t%s%s\nAction:\t%s\n", r.ID, r.Chain, describe(r.Match), ruleExtras(r), r.Action)
+			fmt.Fprintf(w, "ID:\t%d\nChain:\t%s\nMatch:\t%s%s\nAction:\t%s\n", r.ID, r.Chain, describe(r.Match, r.Chain), ruleExtras(r), r.Action)
 		} else {
 			fmt.Fprintf(w, "ID:\t%d\nChain:\t%s\n", r.ID, r.Chain)
 		}
@@ -340,25 +359,20 @@ output (from it) or early (before connection tracking: cheap drops).
 			if err != nil {
 				return err
 			}
-			var resp api.MutationResponse
-			if err := c.Do(ctx(), "POST", "/rules", nil, r, &resp); err != nil {
-				return err
+			// Placed in the same change: one history entry, and never in
+			// force at the end of the chain.
+			q := url.Values{}
+			switch {
+			case rf.first:
+				q.Set("first", "1")
+			case rf.before != 0:
+				q.Set("before", fmt.Sprint(rf.before))
+			case rf.after != 0:
+				q.Set("after", fmt.Sprint(rf.after))
 			}
-			// Then place it.
-			if resp.Applied && (rf.first || rf.before != 0 || rf.after != 0) {
-				var created model.Rule
-				if err := jsonUnmarshal(resp.Object, &created); err == nil {
-					mv := api.MoveInput{Before: rf.before, After: rf.after}
-					if rf.first {
-						mv.To = "start"
-					}
-					var moved api.MutationResponse
-					if err := c.Do(ctx(), "POST", objPath("rules", fmt.Sprint(created.ID))+"/move", nil, mv, &moved); err != nil {
-						return err
-					}
-					resp.Changes = append(resp.Changes, moved.Changes...)
-					resp.ConfirmBy = moved.ConfirmBy
-				}
+			var resp api.MutationResponse
+			if err := c.Do(ctx(), "POST", "/rules", q, r, &resp); err != nil {
+				return err
 			}
 			return report(&resp)
 		},
@@ -426,22 +440,57 @@ output (from it) or early (before connection tracking: cheap drops).
 	move.Flags().BoolVar(&last, "last", false, "last in its chain")
 	move.Flags().StringVar(&chain, "chain", "", "to the end of another chain")
 	cmd.AddCommand(move)
-	cmd.AddCommand(&cobra.Command{
-		Use: "reset-quota ID", Short: "Start a rule's quota again now (every address's, for a per-address quota)", Args: cobra.ExactArgs(1),
+	var resetAddr, give string
+	resetCmd := &cobra.Command{
+		Use: "reset-quota ID [--address ADDR] [--give AMOUNT]", Short: "Start a rule's quota again now, or give some back until its next reset", Args: cobra.ExactArgs(1),
+		Long: `Starts a rule's quota again now: all of it (every address's, for a
+per-address quota), or with --address one address's. --give takes an
+amount off what was used instead: extra allowance until the quota's next
+reset, without changing the rule. Done at once, not staged or on
+probation.
+
+  hc rule reset-quota 31
+  hc rule reset-quota 31 --address 192.168.1.23
+  hc rule reset-quota 31 --give 5gbytes --address 192.168.1.23`,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			in := api.QuotaReset{Address: resetAddr}
+			if give != "" {
+				bad := fmt.Errorf("--give %q: write it as 500mbytes or 5gbytes", give)
+				m := amountRe.FindStringSubmatch(strings.TrimSpace(give))
+				if m == nil {
+					return bad
+				}
+				unit, ok := byteUnit(m[2])
+				n, _ := strconv.ParseInt(m[1], 10, 64)
+				if !ok || unit == "" || n < 1 {
+					return bad
+				}
+				in.Give = n * model.ByteUnits[unit]
+			}
 			c, err := newClient()
 			if err != nil {
 				return err
 			}
-			if err := c.Do(ctx(), "POST", objPath("rules", args[0])+"/reset-quota", nil, nil, nil); err != nil {
+			if err := c.Do(ctx(), "POST", objPath("rules", args[0])+"/reset-quota", nil, in, nil); err != nil {
 				return err
 			}
 			if !flagQuiet {
-				fmt.Printf("reset the quota of rule %s\n", args[0])
+				who := ""
+				if resetAddr != "" {
+					who = " for " + resetAddr
+				}
+				if in.Give > 0 {
+					fmt.Printf("gave back %s of the quota of rule %s%s, until its next reset\n", humanBytes(in.Give), args[0], who)
+				} else {
+					fmt.Printf("reset the quota of rule %s%s\n", args[0], who)
+				}
 			}
 			return nil
 		},
-	})
+	}
+	resetCmd.Flags().StringVar(&resetAddr, "address", "", "only this address's (a per-address quota; an IPv6 address counts for its /64)")
+	resetCmd.Flags().StringVar(&give, "give", "", "take this much off what was used instead (5gbytes, 500mbytes)")
+	cmd.AddCommand(resetCmd)
 	for _, on := range []bool{true, false} {
 		verb, short := "disable", "Keep a rule but don't use it"
 		if on {
@@ -556,7 +605,16 @@ func forwardCmd() *cobra.Command {
 		if f.ToPort != "" {
 			fmt.Fprintf(w, "To port:\t%s\n", f.ToPort)
 		}
-		fmt.Fprintf(w, "To (IPv6):\t%s\nFrom:\t%s\nHairpin:\t%s %s\n", orDash(f.To6), list(f.Sources), yesNo(f.Hairpin), list(f.HairpinSources))
+		hairpin := yesNo(f.Hairpin)
+		if f.Hairpin && len(f.HairpinSources) > 0 {
+			hairpin += ", from " + list(f.HairpinSources)
+		}
+		fmt.Fprintf(w, "To (IPv6):\t%s\nFrom:\t%s\nHairpin:\t%s\n", orDash(f.To6), list(f.Sources), hairpin)
+		if f.Comment != "" {
+			fmt.Fprintf(w, "Comment:\t%s\n", f.Comment)
+		}
+		cs := counters()
+		fmt.Fprintf(w, "Hits:\t%s\n", hits(cs, fmt.Sprintf("f%d", f.ID), fmt.Sprintf("f%d-6", f.ID)))
 	}))
 	var pf model.PortForward
 	var to string
@@ -669,7 +727,7 @@ func snatCmd() *cobra.Command {
 					if to == "" {
 						to = "masquerade"
 					}
-					fmt.Fprintf(w, "%d\t%s\t%s\t%s\t%s\n", x.ID, describe(x.Match), to, hits(cs, fmt.Sprintf("s%d", x.ID)), x.Comment)
+					fmt.Fprintf(w, "%d\t%s\t%s\t%s\t%s\n", x.ID, describe(x.Match, ""), to, hits(cs, fmt.Sprintf("s%d", x.ID)), x.Comment)
 				}
 			})
 		},
@@ -749,7 +807,7 @@ func redirectCmd() *cobra.Command {
 			return output(xs, func(w io.Writer) {
 				fmt.Fprintln(w, "ID\tMATCH\tTO PORT\tHITS\tCOMMENT")
 				for _, x := range xs {
-					fmt.Fprintf(w, "%d\t%s\t%s\t%s\t%s\n", x.ID, describe(x.Match), orDash(x.ToPort), hits(cs, fmt.Sprintf("d%d", x.ID)), x.Comment)
+					fmt.Fprintf(w, "%d\t%s\t%s\t%s\t%s\n", x.ID, describe(x.Match, ""), orDash(x.ToPort), hits(cs, fmt.Sprintf("d%d", x.ID)), x.Comment)
 				}
 			})
 		},

cmd/hc/stats.go

@@ -283,6 +283,7 @@ func statsTopCmd() *cobra.Command {
 				for _, l := range [][]statEntry{down, up} {
 					for _, e := range l {
 						if _, ok := out[e.Key]; !ok {
+							out[e.Key] = [2]int64{}
 							order = append(order, e.Key)
 						}
 					}
@@ -297,10 +298,11 @@ func statsTopCmd() *cobra.Command {
 					v[1] = e.Count
 					out[e.Key] = v
 				}
+				names := lookupNames(order...)
 				return output(map[string]any{"up": up, "down": down}, func(w io.Writer) {
 					fmt.Fprintln(w, "DEVICE\tRECEIVED\tSENT")
 					for _, k := range order {
-						fmt.Fprintf(w, "%s\t%s\t%s\n", k, humanBytes(out[k][0]), humanBytes(out[k][1]))
+						fmt.Fprintf(w, "%s\t%s\t%s\n", named(names, k, k), humanBytes(out[k][0]), humanBytes(out[k][1]))
 					}
 				})
 			case "blocked", "tried":
@@ -309,10 +311,14 @@ func statsTopCmd() *cobra.Command {
 				if err != nil {
 					return err
 				}
+				var names map[string]string
+				if args[0] == "blocked" {
+					names = lookupNames(keys(es)...)
+				}
 				return output(es, func(w io.Writer) {
 					fmt.Fprintln(w, map[string]string{"blocked": "SOURCE", "tried": "WHAT"}[args[0]]+"\tPACKETS")
 					for _, e := range es {
-						fmt.Fprintf(w, "%s\t%d\n", e.Key, e.Count)
+						fmt.Fprintf(w, "%s\t%d\n", named(names, e.Key, e.Key), e.Count)
 					}
 				})
 			case "quota":
@@ -323,10 +329,11 @@ func statsTopCmd() *cobra.Command {
 				if err != nil {
 					return err
 				}
+				names := lookupNames(keys(es)...)
 				return output(es, func(w io.Writer) {
 					fmt.Fprintln(w, "ADDRESS\tUSED")
 					for _, e := range es {
-						fmt.Fprintf(w, "%s\t%s\n", e.Key, humanBytes(e.Count))
+						fmt.Fprintf(w, "%s\t%s\n", named(names, e.Key, e.Key), humanBytes(e.Count))
 					}
 				})
 			}
@@ -338,6 +345,15 @@ func statsTopCmd() *cobra.Command {
 	return cmd
 }
 
+// keys are a top list's keys.
+func keys(es []statEntry) []string {
+	var out []string
+	for _, e := range es {
+		out = append(out, e.Key)
+	}
+	return out
+}
+
 func statsRulesCmd() *cobra.Command {
 	var since string
 	var unused bool

cmd/hc/traffic.go

@@ -9,6 +9,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/spf13/cobra"
 
@@ -37,10 +38,16 @@ rules as it stands.
 			if err != nil {
 				return err
 			}
+			var addrs []string
+			for _, c := range cs {
+				addrs = append(addrs, c.Source, c.Destination)
+			}
+			names := lookupNames(addrs...)
 			return output(cs, func(w io.Writer) {
 				fmt.Fprintln(w, "PROTO\tFROM\tTO\tNAT\tSTATE\tEXPIRES")
 				for _, c := range cs {
-					fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s\n", c.Protocol, hostPort(c.Source, c.SourcePort), hostPort(c.Destination, c.DestinationPort), natText(c), c.State, fmtSeconds(c.Timeout))
+					fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s\n", c.Protocol, named(names, c.Source, hostPort(c.Source, c.SourcePort)),
+						named(names, c.Destination, hostPort(c.Destination, c.DestinationPort)), natText(c), c.State, fmtSeconds(c.Timeout))
 				}
 			})
 		},
@@ -249,42 +256,112 @@ such as some services or addresses). With FROM and TO (a zone, or
 }
 
 func printMatrix(w io.Writer, m api.Matrix) {
+	writeMatrix(w, m, isTerminal(os.Stdout) && flagOutput == "table")
+}
+
+// writeMatrix writes the grid, in colour on a terminal.
+func writeMatrix(w io.Writer, m api.Matrix, color bool) {
 	cols := append(append([]string{}, m.Zones...), "firewall")
 	cells := map[[2]string]api.MatrixCell{}
 	for _, c := range m.Cells {
 		cells[[2]string{c.From, c.To}] = c
 	}
-	color := isTerminal(os.Stdout) && flagOutput == "table"
-	fmt.Fprint(w, "FROM \\ TO")
-	for _, c := range cols {
-		fmt.Fprintf(w, "\t%s", c)
-	}
-	fmt.Fprintln(w)
+	// The grid is padded by hand: tabwriter would count the colours'
+	// escape codes as text, and misalign the columns.
+	grid := [][]string{append([]string{"FROM \\ TO"}, cols...)}
+	kinds := [][]string{make([]string, len(cols)+1)}
+	same := false
 	for _, from := range cols {
-		fmt.Fprint(w, from)
+		row, kind := []string{from}, []string{""}
 		for _, to := range cols {
 			c, ok := cells[[2]string{from, to}]
-			text := "-"
-			if ok {
-				text = map[string]string{"allowed": "allow", "blocked": "block"}[c.Verdict]
-				if n := len(c.Exceptions); n > 0 {
-					text += fmt.Sprintf(" +%d", n)
-				}
-				if color {
-					text = map[string]string{"allowed": "\x1b[32m", "blocked": "\x1b[31m"}[c.Verdict] + text + "\x1b[0m"
-				}
+			if !ok {
+				row, kind = append(row, "-"), append(kind, "")
+				continue
 			}
-			fmt.Fprintf(w, "\t%s", text)
+			text := map[string]string{"allowed": "allow", "blocked": "block", "partly": "partly"}[c.Summary]
+			if c.Allowed > 0 {
+				text += fmt.Sprintf(" +%d", c.Allowed)
+			}
+			if c.Blocked > 0 {
+				text += fmt.Sprintf(" -%d", c.Blocked)
+			}
+			if c.SameZone {
+				text += " *"
+				same = true
+			}
+			row, kind = append(row, text), append(kind, c.Summary)
 		}
-		fmt.Fprintln(w)
+		grid, kinds = append(grid, row), append(kinds, kind)
+	}
+	width := make([]int, len(cols)+1)
+	for _, row := range grid {
+		for i, t := range row {
+			width[i] = max(width[i], utf8.RuneCountInString(t))
+		}
+	}
+	paint := map[string]string{"allowed": "\x1b[32m", "blocked": "\x1b[31m", "partly": "\x1b[33m"}
+	for r, row := range grid {
+		var b strings.Builder
+		for i, t := range row {
+			pad := strings.Repeat(" ", width[i]-utf8.RuneCountInString(t))
+			if i == len(row)-1 {
+				pad = ""
+			} else {
+				pad += "  "
+			}
+			if p := paint[kinds[r][i]]; color && p != "" {
+				t = p + t + "\x1b[0m"
+			}
+			b.WriteString(t + pad)
+		}
+		fmt.Fprintln(w, b.String())
+	}
+	// What the partly open pairs let through.
+	var open [][2]string
+	for _, from := range cols {
+		for _, to := range cols {
+			c, ok := cells[[2]string{from, to}]
+			if !ok || len(c.Open) == 0 || c.SameZone {
+				continue
+			}
+			items := c.Open
+			more := ""
+			if len(items) > 6 {
+				items, more = items[:6], fmt.Sprintf("; %d more", len(c.Open)-6)
+			}
+			open = append(open, [2]string{from + " → " + to, strings.Join(items, "; ") + more})
+		}
+	}
+	if len(open) > 0 {
+		fmt.Fprintln(w, "\nLet through for part of the traffic:")
+		for _, o := range open {
+			fmt.Fprintf(w, "  %s\t%s\n", o[0], o[1])
+		}
+	}
+	fmt.Fprintln(w, "\nallow, block: every new connection; partly: some are let through, some not.")
+	fmt.Fprintln(w, "+N: rules that let part of the traffic through; -N: rules that block part of it. 'hc matrix FROM TO' lists them.")
+	if same {
+		fmt.Fprintln(w, "*: a zone to itself: only traffic routed between its interfaces passes the firewall.")
 	}
-	fmt.Fprintln(w, "\nallow/block: new connections no exception covers; +N: rules deciding for part of the traffic first ('hc matrix FROM TO')")
 }
 
 func printCell(w io.Writer, c api.MatrixCell) {
-	fmt.Fprintf(w, "%s → %s (the %s chain), new connections:\n", c.From, c.To, c.Chain)
-	for _, e := range c.Exceptions {
-		fmt.Fprintf(w, "  %s\t%s\t%s\n", e.Verdict, e.What, e.Label)
+	summary := map[string]string{"allowed": "all allowed", "blocked": "all blocked", "partly": "partly allowed"}[c.Summary]
+	fmt.Fprintf(w, "%s → %s (the %s chain), new connections: %s\n", c.From, c.To, c.Chain, summary)
+	if c.Note != "" {
+		fmt.Fprintf(w, "  (%s)\n", c.Note)
 	}
-	fmt.Fprintf(w, "  %s\tthe rest\t%s\n", c.Verdict, c.DecidedBy)
+	hits := func(h *uint64) string {
+		if h == nil {
+			return "-"
+		}
+		return fmt.Sprintf("%d", *h)
+	}
+	fmt.Fprintln(w, "  VERDICT\tWHAT\tBY\tHITS")
+	for _, e := range c.Exceptions {
+		fmt.Fprintf(w, "  %s\t%s\t%s\t%s\n", e.Verdict, e.What, e.Label, hits(e.Hits))
+	}
+	fmt.Fprintf(w, "  %s\tthe rest\t%s\t%s\n", c.Verdict, c.DecidedBy, hits(c.Hits))
+	fmt.Fprintln(w, "\nHits: each rule's packets since housecarld started, in all its traffic (a rule can cover several pairs).")
 }

cmd/housecarld/main.go

@@ -30,8 +30,10 @@ import (
 	"housecarl/internal/engine"
 	"housecarl/internal/hostif"
 	"housecarl/internal/jarl"
+	"housecarl/internal/jarlsets"
 	"housecarl/internal/linkwatch"
 	"housecarl/internal/model"
+	"housecarl/internal/names"
 	"housecarl/internal/nflog"
 	"housecarl/internal/nft"
 	"housecarl/internal/render"
@@ -155,7 +157,8 @@ func serveCmd() *cobra.Command {
 			host := &hostif.Host{}
 			eng.Env = hostEnv(host)
 			fw := &nft.Firewall{Runner: &nft.Runner{Command: nft.Wrapper()}, Interfaces: host.Exists, BootFile: a.cfg.Ruleset,
-				Shadow: a.cfg.Shadow.Enabled, ShadowBefore: a.cfg.Shadow.Position == config.ShadowBefore}
+				Shadow: a.cfg.Shadow.Enabled, ShadowBefore: a.cfg.Shadow.Position == config.ShadowBefore,
+				Bans: func() []render.Ban { return server.ActiveBans(context.Background(), a.store) }}
 			eng.Firewall = fw
 			if fw.Shadow {
 				a.log.Warn("shadow mode: Housecarl's ruleset is loaded but blocks, rejects and translates nothing; the other firewall decides (docs/shadow.md)", "position", a.cfg.Shadow.Position)
@@ -163,25 +166,54 @@ func serveCmd() *cobra.Command {
 			for _, p := range eng.Problems() {
 				a.log.Warn("configuration problem: "+p.Message, "object", p.Object, "code", p.Code)
 			}
-			var acme *certs.Manager
-			if a.cfg.TLS.ACME.Domain != "" {
+			var jc *jarl.Client
+			if a.cfg.Jarl.Enabled() {
 				tok, err := a.cfg.Jarl.ReadToken()
 				if err != nil {
 					return err
 				}
-				jc, err := jarl.New(a.cfg.Jarl.Server, tok, a.cfg.Jarl.CACert, a.cfg.Jarl.Insecure)
-				if err != nil {
+				if jc, err = jarl.New(a.cfg.Jarl.Server, tok, a.cfg.Jarl.CACert, a.cfg.Jarl.Insecure); err != nil {
 					return err
 				}
+			}
+			var acme *certs.Manager
+			if a.cfg.TLS.ACME.Domain != "" {
+				if jc == nil {
+					return errors.New("tls.acme needs Jarl: set jarl.server and its token (docs/certificates.md)")
+				}
 				acme = certs.New(ctx, certs.Config{ACME: a.cfg.TLS.ACME, Version: version.Short()}, jc, a.store, a.log)
 				go acme.Run(ctx)
 			}
+			// The sets whose addresses come from Jarl: what was last read
+			// is put in force at once, Jarl is read again soon after.
+			jarlSets := &jarlsets.Resolver{Interval: time.Duration(a.cfg.Jarl.Refresh), State: eng.State, Log: a.log,
+				Apply: func(ctx context.Context) error {
+					if err := eng.ApplyCurrent(ctx); err != nil {
+						return err
+					}
+					return fw.SaveBoot(eng.State())
+				},
+				Audit: func(ctx context.Context, set, detail string) {
+					eng.Audit(ctx, &auth.Principal{Method: "jarl"}, "set.jarl", set, "success", detail)
+				},
+				Load: func(ctx context.Context) (string, error) { return a.store.GetMeta(ctx, jarlsets.MetaKey) },
+				Save: func(ctx context.Context, v string) error { return a.store.SetMeta(ctx, jarlsets.MetaKey, v) }}
+			if jc != nil {
+				jarlSets.Source = jc
+			}
+			jarlSets.Restore(ctx)
+			fw.JarlSets = jarlSets
+			var resolver *names.Resolver
+			if a.cfg.Names.Enabled {
+				resolver = names.New(a.cfg.Names.Resolver, time.Duration(a.cfg.Names.Cache))
+			}
 			srv := server.New(server.Config{
 				Listen: a.cfg.Listen, TLSCertFile: a.cfg.TLS.CertFile, TLSKeyFile: a.cfg.TLS.KeyFile, TrustedProxies: a.cfg.Proxies(),
 				SessionLifetime: time.Duration(a.cfg.Session.Lifetime), SessionIdle: time.Duration(a.cfg.Session.IdleTimeout),
 				CookieSecure: a.cfg.Session.CookieSecure, Socket: a.cfg.Socket, ACME: acme,
-				Shadow: a.cfg.Shadow.Enabled, ShadowPosition: a.cfg.Shadow.Position,
+				Shadow: a.cfg.Shadow.Enabled, ShadowPosition: a.cfg.Shadow.Position, Names: resolver, JarlSets: jarlSets,
 			}, eng, fw, host, a.log, web.FS())
+			jarlSets.Connected = srv.Connected
 			// Put the ruleset in force: what was on probation when
 			// housecarld stopped is rolled back first. An empty
 			// configuration applies nothing: its default policies would
@@ -211,6 +243,7 @@ func serveCmd() *cobra.Command {
 			go func() {
 				err := linkwatch.Watch(ctx, func() {
 					host.Forget()
+					jarlSets.Kick() // a zone's networks may have changed
 					if !fw.FlowtableStale(eng.State()) {
 						return
 					}
@@ -247,6 +280,7 @@ func serveCmd() *cobra.Command {
 					}
 				}()
 			}
+			go jarlSets.Run(ctx)
 			go nflog.Listen(ctx, render.LogGroup, a.log, srv.LogPacket)
 			go srv.RunQuotas(ctx)
 			srv.SetConntrack(conntrack.Client{})

contrib/fail2ban/action.d/housecarl.conf

@@ -0,0 +1,52 @@
+# Housecarl's action for fail2ban: a ban goes into a Housecarl ban list,
+# and the list says what the banned address is kept from (the firewall
+# itself, some hosts behind it, or everything). See docs/bans.md.
+#
+# Copy this file to /etc/fail2ban/action.d/housecarl.conf, make a ban
+# list and a token for it alone on the firewall:
+#
+#   hc banlist add web --scope hosts --host 10.0.10.57
+#   hc user add f2b-web --no-password --grant bans:write:web
+#   hc token create web --user f2b-web        # as root on the firewall
+#
+# put the token in /etc/fail2ban/housecarl.token (mode 0600), and use it
+# in a jail:
+#
+#   [sshd]
+#   enabled = true
+#   action  = housecarl[list=web, url="https://router.lan:8070"]
+#
+# The jail's port and protocol go along: port = ssh bans only tcp/22;
+# fail2ban's default (0:65535) bans every port. IPv6 addresses are banned
+# with the list's grouping (a /64 unless set otherwise). Housecarl never
+# bans inside networks, its own addresses or the list's "never".
+#
+# On the firewall itself, the local socket works too, still with the
+# token: url = http://localhost, curlopts = --unix-socket
+# /run/housecarl/housecarl.sock.
+
+[Definition]
+
+actionstart =
+actionstop =
+actioncheck =
+
+# A ban renews one already there; a bantime of -1 is the list's longest.
+actionban = <_curl> -f -X POST -H "Content-Type: application/json" "<url>/api/v1/banlists/<list>/bans"
+            -d '{"address": "<ip>", "protocol": "<protocol>", "ports": "<port>", "time": <bantime>, "source": "fail2ban/<name>"}'
+
+# A ban Housecarl already ended (its own time ran out) is no error.
+actionunban = <_curl> -X DELETE "<url>/api/v1/banlists/<list>/bans?address=<ip>"
+
+[Init]
+
+# The ban list, and Housecarl's URL (its listen address).
+list =
+url = https://127.0.0.1:8070
+# The API token, in a file only root reads.
+tokenfile = /etc/fail2ban/housecarl.token
+# More curl options: --cacert /etc/fail2ban/housecarl-ca.pem for a
+# private CA, --unix-socket for the local socket.
+curlopts =
+
+_curl = curl -sS --max-time 10 <curlopts> -o /dev/null -H "Authorization: Bearer $(cat <tokenfile>)"

docs/api.md

@@ -57,7 +57,9 @@ Calls that change the configuration answer:
   one). Missing when a person must confirm (`manual_confirm`).
 * `?dry_run=1` checks the change, with nftables too, and returns what it
   would do, with `"applied": false, "dry_run": true`, and `diff`: the
-  ruleset's unified diff.
+  ruleset's unified diff, each `@@` line followed by the chain (or other
+  block of the table) the hunk starts in, as in `@@ -40,6 +40,8 @@ chain
+  forward`.
 * `?changeset=ID` (or the header `X-Housecarl-Changeset: ID`) stages the
   change in that changeset instead ([Changesets](#changesets)): the answer
   has `"staged": true`, `changes` (this operation's) and `changeset`.
@@ -77,11 +79,12 @@ Creating answers 201, other changes 200.
 | `GET /healthz` | `ok`, `version`, `firewall` (`applied`, `unconfigured`, `fallback`, `missing`), `mode` (`enforcing`, or `shadow`: the ruleset blocks nothing, [shadow.md](shadow.md)), `probation` (changes waiting to be confirmed), `warnings` (codes); HTTP 503 unless `ok`. Without authentication; read at most every five seconds ([operations.md](operations.md#monitoring)) |
 | `GET /status` | `build`, `started`, `mode` (`enforcing` or `shadow`), `shadow_position` (`after` or `before`, in shadow mode), `applied` (the ruleset is in force), `apply_error`, `problems`, `probation`, `interfaces`, `counts` (objects by kind), `other_tables` (other nftables tables, `"inet main"`) |
 | `GET /interfaces` | the machine's interfaces: `name`, `up`, `addresses`, `zone` |
-| `GET /matrix[?changeset=ID]` | the zone matrix: `zones`, `cells` (`from`, `to` (a zone, or `firewall`), `chain`, `verdict` (allowed, blocked), `decided_by`, `rule_id`, `exceptions`: `rule_id`, `chain`, `label`, `verdict` (allowed, blocked, logged, unknown), `what`) ([rules.md](rules.md#the-zone-matrix)) |
+| `GET /matrix[?changeset=ID]` | the zone matrix: `zones`, `cells` (`from`, `to` (a zone, or `firewall`), `chain`, `summary` (allowed, blocked, partly), `verdict` (what the rest gets: allowed, blocked), `decided_by`, `rule_id`, `hits`, `allowed` and `blocked` (exceptions by verdict), `open` (what the allowing exceptions let through, in short), `same_zone` and `note`, `exceptions`: `rule_id`, `chain`, `label`, `verdict` (allowed, blocked, logged, unknown), `what`, `short`, `hits`). `hits` are the rule's or policy's packets since housecarld started, all its traffic (missing: no counter) ([rules.md](rules.md#the-zone-matrix)) |
 | `GET /ruleset[?enforcing=1]` | the nftables ruleset Housecarl builds, as text. In shadow mode it is the shadow ruleset; `enforcing=1` gives the one loaded once shadow mode is off |
 | `GET /counters` | `{"since", "counters": {"r12": {"packets", "bytes"}, ...}}`, by mark ([design.md](design.md#its-own-table-only)); totals since housecarld started |
 | `GET /quotas` | each rule's quota: `rule_id`, `rule`, `quota`, `used` (bytes), `addresses` (`[{"address", "used"}]` for a per-address quota), `last_reset`, `next_reset` |
 | `GET /connections[?q=&limit=]` | tracked connections: `family`, `protocol`, `source`, `source_port`, `destination`, `destination_port` (or `icmp_id`, `icmp_type`, `icmp_code`), `dnat_to`, `dnat_port`, `snat_to`, `state`, `assured`, `timeout` (seconds left), `packets` and `bytes` when the kernel counts them. `q`: all of its words in the addresses, `:port`, protocol, state |
+| `POST /names` | `{"addresses": [...]}` (at most 2000): `{"enabled", "names": {"192.168.1.20": "laptop.example.net"}}`, the names of the inside addresses among them, by reverse lookup ([configuration.md](configuration.md#names)). Addresses without a name, outside ones, and those still being looked up after a second are left out; ask again for those. `log:read` |
 | `POST /connections/close` | `{"connections": [...]}` (as listed) or `{"search": "192.168.1.50"}`: delete their tracking entries (`config:write`, audited); answers `{"closed": N}`. 409 in shadow mode |
 | `POST /trace` | `{"address", "port", "protocol", "seconds"}` (5-600, default 60): start tracing (`config:write`, audited); 409 while one runs |
 | `GET /trace` | the trace running, or the last: `running`, `input`, `started`, `ends`, `error`, `packets`: each with `time`, `in`, `out`, `protocol`, addresses and ports, `tcp_flags`, `icmp_type`, `steps` (`table`, `chain`, `kind` rule or policy, `rule`, `mark`, `label`, `verdict`), `verdict` (accepted, dropped) and `decided_by`; in shadow mode `would_drop`, the step where Housecarl would have dropped it |
@@ -107,18 +110,18 @@ Lists replace the old ones. `probation_seconds` 0 is the default (120).
 
 ### Objects
 
-Zones, sets, services, rules, port forwards, source NAT and redirects
-share one pattern, `/{kind}` with kind `zones`, `sets`, `services`,
-`rules`, `forwards`, `snats` or `redirects`:
+Zones, sets, services, rules, port forwards, source NAT, redirects and
+ban lists share one pattern, `/{kind}` with kind `zones`, `sets`,
+`services`, `rules`, `forwards`, `snats`, `redirects` or `banlists`:
 
 | | |
 |---|---|
 | `GET /{kind}` | all of them, in order; `GET /rules?chain=input` for one chain; `GET /services` includes the built-in ones |
-| `POST /{kind}` | create; rules, forwards and NAT rules go last unless given a `position` |
-| `GET /{kind}/{ref}` | by ID, or name for zones, sets, services and forwards |
+| `POST /{kind}[?before=ID\|after=ID\|first=1]` | create; rules, forwards and NAT rules go last unless given a `position`, or placed before or after another of their chain, or first, in the same change (one history entry; staged in a changeset, the place goes with it) |
+| `GET /{kind}/{ref}` | by ID, or name for zones, sets, services, forwards and ban lists |
 | `PATCH /{kind}/{ref}` | change the fields given (a JSON merge: `null` clears) |
 | `DELETE /{kind}/{ref}` | refused while something uses it |
-| `POST /rules/{ref}/reset-quota` | start a rule's quota again now (`config:write`; audited, not staged) |
+| `POST /rules/{ref}/reset-quota` | start a rule's quota again now (`config:write`; audited, not staged). Optional body: `{"address": "192.168.1.23"}` starts only that address's again (a per-address quota; an IPv6 address counts for its /64; 404 if it hasn't used the quota); `{"give": 5368709120}` takes that many bytes off what was used instead (the address's, or every address's), until the next reset |
 | `POST /{kind}/{ref}/move` | `{"before": ID}`, `{"after": ID}` or `{"to": "start"\|"end"}`; a rule can take `"chain"` too |
 
 The objects:
@@ -126,6 +129,7 @@ The objects:
 ```json
 {"name": "lan", "interfaces": ["eth1", "eth1.*"], "external": false, "comment": ""}
 {"name": "trusted", "entries": ["192.168.1.0/24", "2001:db8:1::/64"], "dynamic": false, "timeout": 0, "comment": ""}
+{"name": "nas", "entries": [], "jarl": {"names": [{"name": "nas.example.com", "view": "internal"}], "within": ["lan", "10.9.0.0/16"]}, "comment": ""}
 {"name": "web", "entries": ["tcp/8080", "tcp/8443"], "comment": ""}
 {"chain": "input",
  "in_zones": ["wan"], "not_in": false, "out_zones": [], "not_out": false,
@@ -142,9 +146,26 @@ The objects:
  "comment": "", "disabled": false}
 ```
 
+A set with `jarl` takes its addresses from Jarl ([jarl.md](jarl.md#sets-from-jarl)):
+`names` are names in Jarl, each with a `view` (left out: the only view that
+has it); `within` are zones and addresses its addresses must lie in. It
+has no `entries` and isn't `dynamic`; `"jarl": null` makes it an ordinary
+set again.
+
 A source NAT rule is a match (as a rule's, without the rule's other
 fields) with `"to"` (empty: masquerade), a redirect a match with
-`"to_port"`. Times are seconds (`timeout`).
+`"to_port"`. A ban list ([bans.md](bans.md)):
+
+```json
+{"name": "web", "scope": "hosts", "hosts": ["10.0.10.57"], "never": ["trusted"],
+ "default_time": 3600, "max_time": 604800, "max_entries": 10000, "group_v6": 64, "comment": "", "disabled": false}
+```
+
+`scope` is `firewall`, `hosts` or `everything`; 0 is the default for the
+numbers, and `max_time` -1 is no limit. A ban list can't be renamed.
+Someone with a `bans` grant but no `config:read` may read the ban lists
+the grant covers (`GET /banlists`, `GET /banlists/{ref}`). Times are
+seconds (`timeout`).
 
 ### Statistics
 
@@ -195,6 +216,51 @@ These need `sets:read` or `sets:write`, for that set
 ([permissions.md](permissions.md)); they aren't on probation or in the
 history, but are audited.
 
+### Sets from Jarl
+
+| | |
+|---|---|
+| `GET /sets/{name}/jarl` | what the set holds and why (below) |
+| `POST /sets/{name}/jarl/refresh` | reads Jarl now (for every set from Jarl), then answers as `GET` |
+
+They need `sets:read` for that set. 400 for a set that doesn't come from
+Jarl. The answer:
+
+```json
+{"set": "nas", "configured": true, "read": "2026-10-23T14:02:11Z", "error": "",
+ "entries": ["10.10.0.20", "10.10.0.21"], "within": ["lan"],
+ "names": [{"name": "files.example.com", "view": "", "found_view": "internal", "chain": ["nas.example.com"],
+            "addresses": [{"address": "10.10.0.20", "used": true},
+                          {"address": "2001:db8:10::20", "used": false, "why": "not within lan"}],
+            "problem": "", "checked": "2026-10-23T14:02:11Z", "error": ""}]}
+```
+
+* `configured`: `housecarl.yaml` names a Jarl server; `read`: when Jarl's
+  zones were last read; `error`: why the last read failed (the set keeps
+  its addresses).
+* `entries`: the addresses the set holds now.
+* For each name: `found_view` is the view it was read from, `chain` the
+  CNAMEs followed, `addresses` every address Jarl gives it with `used`
+  (or `why` not), `problem` why it gives none, `checked` when Jarl last
+  answered for it, and `error` why the last try failed (its addresses are
+  then those of `checked`).
+
+### Bans
+
+| | |
+|---|---|
+| `GET /bans` | the active bans of every ban list you may read: `id`, `list_id`, `list`, `address` (an address, or an IPv6 prefix), `protocol` and `port` (none: every port), `expires` and `timeout` (seconds left; none: no end), `created`, `who`, `source`, `reason` |
+| `GET /banlists/{ref}/bans` | one list's |
+| `POST /banlists/{ref}/bans` | ban: `{"address": "203.0.113.9", "protocol": "tcp", "ports": "ssh", "time": 3600, "source": "guard/ssh", "reason": "…"}`. `ports` is a number, a string (`"22"`, `"http,https"`, `"0:65535"` or `"all"` for every port) or a list; without a protocol a number is TCP and UDP, a service its own protocols. `time` 0 is the list's default, -1 its longest; longer is cut down. 201 with `{"bans": [ban…, "existing": true for a renewed one], "closed": N}` (connections closed) |
+| `DELETE /banlists/{ref}/bans/{id}` | lift one ban |
+| `DELETE /banlists/{ref}/bans?address=A` | lift all of an address's bans (404 if it has none) |
+
+These need `bans:read` or `bans:write` for the list
+([permissions.md](permissions.md)); bans aren't on probation or in the
+history, but are audited (`ban.add`, `ban.remove`). Refusals: `422
+never_ban` (inside, the firewall's own, the caller's own, or in the
+list's `never`), `422 list_full`, `409` for a disabled list.
+
 ### Probation
 
 | | |
@@ -209,6 +275,7 @@ history, but are audited.
 |---|---|
 | `GET /history[?limit=&before=]` | changes, newest first |
 | `GET /history/{id}` | one, with each object before and after |
+| `GET /history/{id}/diff` | `{"diff"}`: what it did to the ruleset, as a unified diff with each hunk's chain (the configuration before and after it, got back from the current one, rendered by this version) |
 | `POST /history/{id}/revert` | undo it; 409 if an object it touched has changed since, or it was undone already |
 | `POST /import/nft` | `{"json": NFT_JSON, "text": "nft -a list ruleset output", "defines": "ruleset file", "table": "inet main", "zones": {"enp2s0": "lan"}, "replace": false}` ([import.md](import.md)); answers with `state` (the imported configuration), `notes` and `raw` too |
 | `POST /takeover` | `{"tables": ["inet main"]}`: delete these tables (administrators); on probation over the network; 409 in shadow mode |

docs/bans.md

@@ -0,0 +1,148 @@
+# Ban lists
+
+A **ban list** is where a program bans addresses: Guard (Housecarl's
+companion, which reads logs), fail2ban with Housecarl's action, or you
+with `hc ban`. The program says only *which address*, and perhaps a
+protocol and ports. The ban list says what that address is kept from.
+So a web server that sees password guessing in its own logs can ban the
+guesser at the router without knowing anything about the router.
+
+## Ban lists
+
+```sh
+hc banlist add router --scope firewall                   # the firewall itself
+hc banlist add web --scope hosts --host 10.0.10.57 --host 2001:db8:10::57
+hc banlist add edge --scope everything --never trusted
+```
+
+| Scope | Banned addresses are kept from | Where the drops are |
+|---|---|---|
+| `firewall` | the firewall itself: its SSH, DNS, web UI | `input` |
+| `hosts` | the list's hosts (addresses or sets), behind the firewall | `forward`, to those addresses |
+| `everything` | the firewall and everything behind it | `input` and `forward` |
+
+A `hosts` list covers port forwards to its hosts as well: the forward
+chain sees a forwarded connection's translated address and port, the
+host's own. A web server's Guard bans `tcp/22`, and that is right even
+when the router forwards its port 2222 to it.
+
+Other settings, with their defaults:
+
+| Setting | Default | |
+|---|---|---|
+| `never` | none | addresses, prefixes or sets this list never bans |
+| `default_time` (`--time`) | 1h | a ban's length when the program asks for none |
+| `max_time` (`--max-time`) | 7d | the longest ban; longer ones are cut to it. `-1` (`none`): no limit, so bans may be permanent |
+| `max_entries` | 10000 | the most bans the list holds; more are refused (`list_full`) |
+| `group_v6` | 64 | the IPv6 prefix length banned for an address. One customer usually has a whole /64 and can move around in it; 128 bans the one address. IPv4 addresses are banned alone |
+| `disabled` | no | the list's bans aren't in force (they are kept) |
+
+A ban list can't be renamed: the tokens and programs that ban into it
+know it by its name. Make a new one instead.
+
+## Bans
+
+```sh
+hc ban edge 203.0.113.9 --time 1d --reason "port scan"
+hc ban web 203.0.113.9 --tcp ssh --tcp 8443
+hc bans                       # every list's
+hc bans web
+hc unban web 203.0.113.9      # all of the address's bans in web
+hc unban web 17               # one, by ID
+```
+
+A ban is of **every port**, or of **a protocol's ports** (numbers or
+service names, built-in or yours). A port without a protocol is banned
+for TCP and UDP; a service name takes the service's protocols. Banning an
+address again renews the ban: its new time counts from now.
+
+Bans are dropped **ahead of every rule** in their chains, and ahead of
+the built-in that lets established connections through, so a ban cuts a
+connection that is already open. Housecarl also closes the banned
+address's tracked connections the ban covers when it bans it, because
+connections offloaded to the flowtable no longer pass the rules at all.
+Replies to connections the inside opened to a banned address are
+dropped too.
+
+Bans are kept in the database, apart from the configuration (like a
+dynamic set's entries): they aren't in the history, can't be undone,
+aren't on probation, and don't go through changesets. They end by
+themselves; every change, restart and reboot puts the active ones back
+with the time they have left. Each ban and unban is in the audit log
+(`ban.add`, `ban.remove`), with the program's source and reason.
+
+### What is never banned
+
+Whatever a list's `never` says, Housecarl refuses (`422 never_ban`) to
+ban:
+
+* the inside: addresses in networks of inside zones' interfaces, and
+  private addresses outside the external zones' networks;
+* the firewall's own addresses, and its own prefixes (settings);
+* the address of whoever asks (a program can't lock itself out);
+* loopback, link-local, multicast and unspecified addresses.
+
+A ban grouped to a prefix (IPv6) is refused when the prefix overlaps any
+of these.
+
+## Programs and tokens
+
+Give each program a token for its list alone. A `bans` grant can name
+ban lists, as a `sets` grant names sets:
+
+```sh
+hc user add guard-web --no-password --grant bans:write:web
+hc token create web --user guard-web          # as root on the firewall
+```
+
+With it, the program may ban into `web` and lift its bans, list them,
+and read the list itself (`GET /banlists/web`: its grouping and times),
+and nothing else. `viewer` has `bans:read`, `operator` `bans:write`.
+
+## Guard
+
+Guard reads log files and the systemd journal on any machine, and bans
+the addresses that misbehave into a ban list (its own documentation).
+Run it on the web server with a token for `web`, and on the router with
+one for `router` (or the local socket).
+
+## fail2ban
+
+Housecarl ships an action for fail2ban,
+`/usr/share/doc/housecarl/contrib/fail2ban/action.d/housecarl.conf`
+(`contrib/` in the source). Copy it to `/etc/fail2ban/action.d/`, put
+the token in `/etc/fail2ban/housecarl.token` (mode 0600), and use it in a
+jail:
+
+```ini
+[sshd]
+enabled = true
+action  = housecarl[list=web, url="https://router.lan:8070"]
+```
+
+The jail's `port` and `protocol` go with each ban: `port = ssh` bans only
+`tcp/22`, fail2ban's default `0:65535` bans every port. A `bantime` of
+`-1` is the list's longest ban. When fail2ban unbans an address Housecarl
+already let go (its own time ran out first), nothing happens. Add
+`curlopts = --cacert /etc/fail2ban/housecarl-ca.pem` for a private CA.
+
+## Shadow mode
+
+In shadow mode the ban rules count what they would drop
+(`[would drop]`) and let it through, like every other rule, and banning
+closes no connections.
+
+## The ruleset
+
+Each list has four sets, `ban_<id>_v4`, `ban_<id>_v6` (every port) and
+`ban_<id>_v4_svc`, `ban_<id>_v6_svc` (address, protocol and port), all
+with timeouts:
+
+```
+ip saddr @ban_3_v4 counter drop comment "hc:ban3"
+ip saddr . meta l4proto . th dport @ban_3_v4_svc counter drop comment "hc:ban3"
+ip6 saddr and ffff:ffff:ffff:ffff:: @ban_3_v6 counter drop comment "hc:ban3"
+```
+
+Set names starting with `ban_` are therefore Housecarl's own
+(`set_name_reserved`).

docs/cli.md

@@ -32,6 +32,7 @@ command and its flags.
 | `-C, --changeset ID` | `HOUSECARL_CHANGESET` (checked, see [Changesets](#changesets)) | stage configuration changes in this changeset instead of making them |
 | `-o, --output FORMAT` | | `table` (default), `json`, `yaml` or `id` |
 | `-q, --quiet` | | print only errors (and the IDs of new objects) |
+| `--no-names` | | show inside addresses without their names: tables show `192.168.1.20 (laptop)` ([configuration.md](configuration.md#names)) |
 
 Exit codes: 0 ok, 1 error, 3 not authenticated or not allowed, 4 not
 found, 5 conflict, 6 invalid or refused by validation or nftables, 7
@@ -59,7 +60,8 @@ applied and saved (history 12; undo with 'hc history undo 12')
 ```
 
 `-n` shows what would change without changing it, with the diff of the
-ruleset; nftables checks it too.
+ruleset (each `@@` line names the chain the lines below it are in);
+nftables checks it too.
 
 ## Changesets
 
@@ -139,7 +141,7 @@ by name.
 | `log [-f] [--search TEXT] [--limit N]` | the packets logged by rules and policies ([operations.md](operations.md#the-log)) |
 | `connections [--search TEXT] [--limit N]`, `connections close --search TEXT [-y]` | tracked connections; closing makes the rules check them again ([operations.md](operations.md#connections)); not in shadow mode |
 | `stats [--since 24h]` | traffic per zone, drops, the busiest rules, blocked sources, devices; `stats status`, `stats traffic`, `stats top devices\|blocked\|tried\|quota ID`, `stats rules [--unused]`, `stats connections` ([stats.md](stats.md#the-cli)) |
-| `matrix [FROM TO]` | what the rules do to new connections between zones; with FROM and TO, that pair's rules in order ([rules.md](rules.md#the-zone-matrix)) |
+| `matrix [FROM TO]` | what the rules do to new connections between zones (allow, block or partly), and what is let through; with FROM and TO, that pair's rules in order, with their hits ([rules.md](rules.md#the-zone-matrix)) |
 | `trace [--address A] [--port N] [--protocol P] [--seconds S]` | follow packets through every table's rules ([operations.md](operations.md#tracing)) |
 
 ### zone, set, service
@@ -152,8 +154,10 @@ by name.
 | `zone delete ZONE` | refused while rules use it |
 | `set list`, `set show SET` | |
 | `set add NAME [ENTRY...] [--dynamic] [--timeout 24h] [--comment C]` | |
-| `set update SET [--entry E]... [--add E] [--remove E] [--timeout] [--name] [--comment]` | `--entry` replaces the entries |
+| `set add NAME --jarl NAME[@VIEW]... --within ZONE\|NETWORK...` | a set from Jarl: the names' addresses, only those within the zones and networks ([jarl.md](jarl.md#sets-from-jarl)) |
+| `set update SET [--entry E]... [--add E] [--remove E] [--timeout] [--jarl N]... [--within W]... [--name] [--comment]` | `--entry` replaces the entries, `--jarl` a Jarl set's names, `--within` where its addresses may be |
 | `set entries SET`, `set entries add SET ADDRESS [--timeout 1h]`, `set entries remove SET ADDRESS` | a dynamic set's entries |
+| `set jarl SET [--refresh]` | a set from Jarl: each name's addresses in Jarl (CNAMEs followed), used or why not, and when Jarl answered; `--refresh` reads Jarl first |
 | `set delete SET` | |
 | `service list`, `service show SERVICE` | with the built-in ones |
 | `service add NAME ENTRY... [--comment C]` | entries `tcp/22`, `udp/1000-2000`, `icmp/echo-request`, `icmpv6/packet-too-big` |
@@ -171,7 +175,7 @@ See [rules.md](rules.md).
 | `rule update ID [flags]` | only the flags given |
 | `rule move ID --before ID\|--after ID\|--first\|--last\|--chain CHAIN` | |
 | `rule enable\|disable ID` | |
-| `rule reset-quota ID` | start a rule's quota again now |
+| `rule reset-quota ID [--address ADDR] [--give 5gbytes]` | start a rule's quota again now, or one address's; `--give` takes an amount off what was used instead, until the next reset |
 | `rule delete ID` | |
 
 The match flags (`rule add`, `snat add`, `redirect add`):
@@ -203,6 +207,19 @@ accept|drop|reject|log`, `--reject-with tcp-reset`, `--log`,
 
 See [nat.md](nat.md).
 
+### banlist, ban
+
+| Command | |
+|---|---|
+| `banlist list`, `banlist show BANLIST` | ban lists, with their bans' count |
+| `banlist add NAME --scope firewall\|hosts\|everything [--host ADDR\|SET]... [--never ADDR\|SET]... [--time 1h] [--max-time 7d\|none] [--max-entries N] [--group-v6 64] [--disabled] [--comment C]` | |
+| `banlist update BANLIST [flags]`, `banlist delete BANLIST` | `--host` and `--never` replace the lists; no renaming |
+| `bans [BANLIST]` | the active bans |
+| `ban BANLIST ADDRESS [--tcp PORT\|SERVICE]... [--udp …]... [--time 1h\|none] [--reason R]` | ban every port, or some; again renews |
+| `unban BANLIST ADDRESS\|ID` | lift one ban, or all of an address's |
+
+See [bans.md](bans.md).
+
 ### settings
 
 | Command | |
@@ -217,7 +234,8 @@ See [nat.md](nat.md).
 | `confirm` | keep the changes on probation; the ruleset is saved for the boot |
 | `rollback` | undo the changes on probation now |
 | `history list [--limit N]` | changes, newest first |
-| `history show ID` | each object before and after |
+| `history show ID` | each object before and after (a changed setting by its own fields: `builtins.drop_invalid: false -> true`) |
+| `history diff ID` | what the change did to the ruleset |
 | `history undo ID` | apply the change backwards (refused if something it touched has changed since) |
 | `import [FILE\|-] [--text FILE] [--defines FILE] [--table T] [--zone IFACE=NAME]... [--replace]` | [import.md](import.md) |
 | `takeover TABLE... [-y]` | delete tables Housecarl's ruleset replaces (administrators); not in shadow mode |

docs/configuration.md

@@ -13,7 +13,8 @@ reads the file when it starts.
 | `listen` | `["127.0.0.1:8070"]` | addresses of the web UI and API (`host:port`). Keep them on localhost or a management network, and write an input rule that lets you reach them |
 | `tls.cert_file`, `tls.key_file` | none | serve HTTPS with this certificate; housecarld rereads it when the file changes, or on `systemctl reload housecarl` |
 | `tls.acme.*` | off | get the certificate from Let's Encrypt, with Jarl publishing the challenge ([certificates.md](certificates.md#settings)) |
-| `jarl.server`, `jarl.token_file` (or `jarl.token`), `jarl.ca_cert`, `jarl.insecure` | none | the Jarl server for the certificate's challenge, and its token ([jarl.md](jarl.md)) |
+| `jarl.server`, `jarl.token_file` (or `jarl.token`), `jarl.ca_cert`, `jarl.insecure` | none | the Jarl server for the certificate's challenge and the sets from Jarl, and its token ([jarl.md](jarl.md)) |
+| `jarl.refresh` | `1m` | how often the sets from Jarl read their names (10s or more; [jarl.md](jarl.md#when-the-addresses-change)) |
 | `ruleset` | `/var/lib/housecarl/ruleset.nft` | the confirmed ruleset, which `housecarl-ruleset.service` loads at boot; its fallback is saved beside it as `ruleset-fallback.nft` ([operations.md](operations.md#if-the-ruleset-fails-to-load-at-boot)). Change both paths in the unit too |
 | `trusted_proxies` | `[]` | addresses or prefixes of reverse proxies whose `X-Forwarded-For` and `X-Forwarded-Proto` are believed |
 | `socket` | `/run/housecarl/housecarl.sock` | the local API socket; `""` turns it off |
@@ -32,12 +33,34 @@ reads the file when it starts.
 | `stats.top_n` | `100` | entries kept per top list, per hour and per day |
 | `shadow.enabled` | `false` | shadow mode: Housecarl's ruleset is loaded beside the firewall you have, but blocks, rejects and translates nothing; its counters, log and tracer show what it would do. No change is on probation, and takeovers and closing connections are refused ([shadow.md](shadow.md)) |
 | `shadow.position` | `after` | where Housecarl's filter chains run in shadow mode: `after` the other firewall's (`filter + 10`: it sees only what that one lets through, so what it would drop is what switching would break) or `before` them (`filter - 10`: it sees every packet) |
+| `names.enabled` | `true` | show inside addresses' names beside them, found by reverse lookups (below) |
+| `names.resolver` | `""` | the DNS server to ask, such as `10.10.0.1:53`; empty: the system's (`/etc/hosts`, then `/etc/resolv.conf`) |
+| `names.cache` | `10m` | how long a name, or the lack of one, is kept |
 
 Durations are written `15s`, `12h` or `30d`.
 
 Shadow mode is here, and not a firewall setting, so that no user or API
 token can switch enforcement off; restart housecarld to switch.
 
+### Names
+
+The web UI and `hc` show a name beside each **inside** address in
+connections, the log, quotas and traffic per device: `laptop
+192.168.1.20`. Housecarl finds it with a reverse (PTR) lookup, so the
+names are your reverse zones' (and `/etc/hosts`'). An address counts as
+inside when it is in a network connected to an inside zone's interface,
+or private (`10.0.0.0/8`, `172.16.0.0/12`, `192.168.0.0/16`, `fc00::/7`)
+and not in an external zone's network. Outside addresses get no name:
+their reverse zones belong to whoever holds the addresses, who would
+choose the names, and looking up every scanner is slow.
+
+Names are looked up when a page or `hc` asks, cached (a failed lookup is
+tried again after a minute), and never stored: statistics stay by
+address. With a split DNS (views), the server asked must answer the
+firewall as an inside client; set `names.resolver` if the system's
+resolver doesn't. IPv6 traffic per device is counted per /64, which has
+no name. `hc --no-names` leaves them out.
+
 The probation's length is a firewall setting, not here: `hc settings set
 --probation 5m`. So is counting traffic per device for the statistics:
 `hc settings set --stats-per-device on`.

docs/design.md

@@ -94,7 +94,8 @@ table inet housecarl { ... }
 Two things survive the replacement: the **entries of dynamic sets**
 (read before, written back with their remaining timeouts, in the same
 script), and the **counters** (housecarld adds the old totals to the
-new, so hits don't reset with every change).
+new, so hits don't reset with every change). Sets from Jarl are written
+with the addresses last read from Jarl.
 
 Every rule carries a comment `hc:<mark>`, such as `hc:r12` for rule 12,
 `hc:f3` for port forward 3, `hc:b-established` for a built-in. Counters
@@ -199,8 +200,15 @@ Housecarl's replaces it ([import.md](import.md)).
   may only change that set (`sets:write:guests`). Addresses, not MAC
   addresses: matching by MAC only works on the guests' own network
   segment.
-* **Names instead of addresses**: Steward knows every reservation's
-  address and Jarl every name, so rules could name a device or a subnet.
+* **Names instead of addresses**: a set can take its addresses from Jarl
+  ([jarl.md](jarl.md#sets-from-jarl)). housecarld reads the names' A and
+  AAAA records through Jarl's API (CNAMEs followed, one view per name)
+  and keeps the addresses that lie within the zones and networks the set
+  allows; Jarl never calls Housecarl. What was last read is kept (in the
+  database too) while Jarl can't be reached. A change of the addresses
+  applies the ruleset again without a history entry, as dynamic sets'
+  entries aren't in it either. Names Steward makes from leases must not
+  be used: a client chooses its own hostname.
 * **The web UI's certificate** comes through Jarl, as Steward's does
   ([certificates.md](certificates.md)).
 

docs/development.md

@@ -20,12 +20,14 @@ internal/
   server/             the HTTP API and the web UI, authentication, the local socket, probation, the log ring
   api/, client/       JSON types and the Go client shared by server and CLI
   auth/               passwords (argon2id), tokens, sessions, grants and roles
-  certs/, jarl/       the web UI's certificate through Jarl (docs/certificates.md)
+  certs/, jarl/       the web UI's certificate through Jarl (docs/certificates.md); jarl/ is the Jarl API client
+  jarlsets/           sets from Jarl: reads the names, follows CNAMEs, keeps what was read, within (docs/jarl.md)
   config/             housecarld's YAML configuration
   version/            what a build reports
   web/static/         the web UI: plain ES modules, no build step, embedded with go:embed
 deploy/               systemd units, sysusers.d and tmpfiles.d files, Debian package scripts
 scripts/e2e.sh        end-to-end test with real traffic through a router container
+scripts/fakejarl/     the bit of Jarl's API sets from Jarl read, for the e2e test
 scripts/mkdeb.sh      the Debian packages (make deb)
 scripts/logo.py       the web UI's logo from artwork/logo.svg
 scripts/banner.py     the README's banner from the web UI's logo and wordmark
@@ -135,6 +137,14 @@ As for Jarl and Steward:
 3. Run `make test && make e2e`.
 4. Commit as "Release X", tag it `git tag -a vX -m "Housecarl X"`, and push.
 
+A fix to a release candidate may go out as a build of it rather than a
+new candidate: `0.2.0-rc.3+git<count>-<commit>`, where `<commit>` is the
+short ID of the last commit before "Release X" and `<count>` is `git
+rev-list --count` of it. The count orders the builds (apt compares it as a
+number; the ID alone would order them at random); each sorts after
+`0.2.0-rc.3` and before `0.2.0-rc.4`. Debian writes it
+`0.2.0~rc.3+git<count>~<commit>`.
+
 The tag starts `.gitea/workflows/release.yml`, which checks the tag
 against `VERSION` and the CHANGELOG, runs the tests, builds the tarballs,
 the CLI for each OS and the `.deb`s, and publishes them

docs/jarl.md

@@ -1,24 +1,44 @@
 # Connecting Housecarl to Jarl
 
 Housecarl uses [Jarl](https://gitea.adbraun.lol/adam/jarl), the BIND
-manager, for its DNS records. In this version that means one thing: the
-DNS-01 challenge for the web UI's certificate ([certificates.md](certificates.md)).
-Naming hosts in rules by their DNS names may use the same connection later.
+manager, for two things:
+
+* the DNS-01 challenge for the web UI's certificate
+  ([certificates.md](certificates.md)): Housecarl writes a TXT record;
+* **sets from Jarl** ([below](#sets-from-jarl)): sets whose addresses are
+  those of names in Jarl, such as `nas.adbraun.lol`, kept up to date.
+  Housecarl only reads.
 
 Housecarl talks to Jarl's REST API with an API token. Give it a **user of its
-own**, with **only the permission it needs**.
+own**, with **only the permission it needs**. Jarl never calls Housecarl.
 
 ## 1. A user for Housecarl, in Jarl
 
 On the Jarl server, make a user without a password. It can't log in to
-Jarl's web UI, only use its tokens. Grant it the challenge record of
-Housecarl's own name, and nothing else:
+Jarl's web UI, only use its tokens.
+
+For **sets from Jarl**, grant it reading the records of the zones and views
+your names are in:
+
+```sh
+jarl user create housecarl --no-password --comment "Housecarl on fw01" \
+    --grant "records:read zones=adbraun.lol views=internal"
+```
+
+Include every zone a name's CNAMEs lead to as well (`zones=adbraun.lol,wg.adbraun.lol`).
+Reading is all it needs: it can't change anything in Jarl.
+
+For the **certificate**, grant it the challenge record of Housecarl's own
+name, and nothing else:
 
 ```sh
 jarl user create housecarl --no-password --comment "Housecarl on fw01" \
     --grant "records:write zones=adbraun.lol names=_acme-challenge.fw.adbraun.lol types=TXT"
 ```
 
+For both, give both grants (`--grant` twice). `jarl user update housecarl
+--grant ... --grant ...` replaces a user's grants with the ones given.
+
 Use your zone for `adbraun.lol`, and the name Housecarl's web UI is reached
 by for `fw.adbraun.lol` (`tls.acme.domain`). The grant lets the token add
 and remove TXT records at exactly `_acme-challenge.fw.adbraun.lol`:
@@ -63,7 +83,9 @@ around more readily.
 You can give the token an expiry (`--expires 365d`). Rotate it in Jarl with
 `jarl token rotate ID --grace 1d`, then put the new secret in the file and
 restart housecarld within the grace period. Since the certificate is renewed
-every couple of months, nothing breaks while you do.
+every couple of months, nothing breaks while you do. Sets from Jarl keep
+their addresses while the token doesn't work (they warn, see
+[below](#when-jarl-cant-be-reached)), so they don't break either.
 
 ## 3. Housecarl's settings
 
@@ -74,6 +96,7 @@ jarl:
   server: https://dns.adbraun.lol:8053
   token_file: /etc/housecarl/jarl.token
   # ca_cert: /etc/housecarl/jarl-ca.pem   # if Jarl's certificate isn't from a public CA
+  # refresh: 1m                           # how often sets from Jarl read their names
 ```
 
 Then restart housecarld (`systemctl restart housecarl`). Housecarl needs to
@@ -83,3 +106,192 @@ address Housecarl can reach, ideally over HTTPS.
 `hc cert check` ([certificates.md](certificates.md#checking)) tests
 the connection, the token's permission, and that the record reaches the
 internet.
+
+## Sets from Jarl
+
+A set can take its addresses from Jarl instead of listing them: you name
+DNS names, and the set holds their addresses. Rules use it like any other
+set. When a record changes in Jarl, the set follows within a minute,
+without a change to Housecarl's configuration.
+
+```sh
+hc set add nas --jarl nas.adbraun.lol@internal --within lan
+hc rule add forward --in wg --to nas --service smb
+hc set jarl nas                       # what it holds, name by name
+```
+
+In the web UI: Sets → Add set, kind "from Jarl". The **Addresses…**
+button shows what the set holds.
+
+A set from Jarl has:
+
+* **names**: one or more names, each `NAME@VIEW`, or `NAME` when only one
+  of Jarl's views has it ([Views](#views));
+* **within**: where its addresses may be, one or more zones or networks
+  ([Within](#within)). It is required.
+
+It has no entries of its own, and isn't dynamic. It can be renamed (it goes
+by its names in Jarl, not by its own).
+
+### What a name gives
+
+Housecarl reads the name's records as named would answer them in the
+view:
+
+* **Every A and AAAA record** of the name. A name with three addresses
+  puts all three in the set, IPv4 and IPv6 alike; a rule using the set
+  matches each family with its own addresses.
+* **CNAMEs are followed**: `files.adbraun.lol CNAME nas.adbraun.lol.` gives
+  nas's addresses. Chains are followed up to 8 CNAMEs, from zone to zone
+  (a sub-zone such as `wg.adbraun.lol` too), but always in the **same
+  view**, and only into zones Jarl holds. `hc set jarl` shows the chain:
+  `files.adbraun.lol → nas.adbraun.lol`.
+* **Disabled records** are left out, as named leaves them out.
+
+A name gives **no addresses**, and a warning (`jarl_name`) says why, when:
+
+* it has no A, AAAA or CNAME record (only an MX, say, or nothing);
+* only a **wildcard** (`*.adbraun.lol`) would answer for it: wildcards
+  aren't followed, so name a record of its own;
+* a **CNAME leads out of Jarl** (`host.duckdns.org`), into a zone Jarl
+  doesn't hold, or to a name with no address;
+* the CNAMEs **loop**, or are more than 8;
+* it is **below a delegation**: NS records in the zone hand that part to
+  other servers, so Jarl doesn't hold its records;
+* its zone is a **secondary, mirror, stub or forward zone** (Jarl doesn't
+  hold their records), or **disabled** in Jarl;
+* no zone the token can see holds it.
+
+A **reverse zone** isn't involved: Housecarl reads the A and AAAA records
+only, never PTRs.
+
+An **in-view zone** (one view serving another's zone) is followed to the
+zone it serves: `srv.adbraun.lol@vps` reads the internal view's records if
+vps's `adbraun.lol` is an in-view of internal's.
+
+### Views
+
+The same name can have different addresses in different views: Jarl's
+`internal` view may give `nas.adbraun.lol` its private address, `external`
+a public one. A set reads **one view per name**, written `NAME@VIEW`:
+
+* **Name the view your devices see.** The firewall matches the addresses
+  packets carry, and for devices inside that is the internal view's.
+* **Without a view**, the name is read from the only view that has a zone
+  for it. If zones in **more than one view** hold it, the name gives
+  nothing until you name the view (`jarl_name`: "is in Jarl's views
+  external, internal: name the view"). This counts every view whose zones
+  cover the name, even one where the name has no record: a record added
+  there later would otherwise change which view Housecarl reads.
+* **Linked zones** make no difference: a shared record has the same
+  address in every view, and a view's own records are why the view is
+  named.
+* **Without views** in Jarl, write the name alone.
+* A set can mix views: `--jarl nas.adbraun.lol@internal --jarl
+  host.adbraun.lol@vps`.
+
+A wrong view can't widen the set: an address from it that isn't
+[within](#within) is left out.
+
+### Within
+
+`--within` says where the set's addresses may be. Each entry is:
+
+* **a zone**: the networks connected to its interfaces (the addresses on
+  them, as `hc status` lists them), IPv4 and IPv6;
+* **a network, address or range**: `10.10.0.0/24`, `2001:db8:10::/64`,
+  `192.0.2.7`.
+
+An address from Jarl that isn't within any of them is **left out** of the
+set, and a warning names it (`jarl_outside`: "nas.adbraun.lol has address
+192.0.2.9, which is left out: not within lan"). The set's other addresses
+stay. So a record changed in Jarl, by mistake or by someone who shouldn't,
+can only point the set at addresses you allowed.
+
+Zones grow by themselves: when you add a VLAN to the `lan` zone, or give
+an interface another network, its addresses count at once. A new zone
+counts only once you add it to `within`. If a zone's interfaces have no
+address for a while (at boot, a link down), the networks it had last count.
+
+Some addresses never count, whatever `within` says: unspecified (`0.0.0.0`,
+`::`), loopback and multicast ones.
+
+`within 0.0.0.0/0` or `::/0` lets any address in, and gives a warning
+(`set_jarl_anywhere`): then whoever can change the names in Jarl decides
+what the set holds. Name a zone or a network instead. For an address
+outside your networks, such as a VPS's public address, name that address
+or its network.
+
+### When the addresses change
+
+Housecarl reads the names every `jarl.refresh` (a minute), right after a
+change to Housecarl's configuration (a new set or name), when an interface
+changes, and when you ask: `hc set jarl NAME --refresh`, or **Read Jarl
+now** in the web UI.
+
+When a set's addresses change, housecarld puts the ruleset in force again
+with the new ones. That isn't a change of the configuration: there is no
+history entry and no probation. It is recorded in the audit log
+(`set.jarl`, "added 10.10.0.22; removed 10.10.0.20") and in the journal.
+
+A new set holds nothing for the moment until its names are read, usually
+less than a second.
+
+**Open connections aren't closed** when an address leaves a set, as with
+any change to a set: the connection's packets are let through as part of an
+established connection (or by the flowtable). Close them with `hc
+connections close` if they must stop at once.
+
+### When Jarl can't be reached
+
+A set **keeps the addresses it last had** while Jarl can't be read: Jarl is
+down, the network to it is, or the token stopped working. Nothing is
+emptied, so rules keep working. A warning says so (`jarl_unreachable`), on
+the status page and in `hc status`, and `hc set jarl` shows when Jarl last
+answered.
+
+What was last read is saved in the database. After a restart or a reboot,
+the sets get those addresses at once, before Jarl is read again, and the
+boot ruleset ([operations.md](operations.md)) has them too.
+
+When Jarl **answers** that a record is gone, its addresses go. Only a
+failure to read keeps them.
+
+Without `jarl.server` in `housecarl.yaml`, sets from Jarl keep what they
+had (nothing if Jarl was never read) and warn (`jarl_not_configured`).
+
+### Who decides what the set holds
+
+A set from Jarl lets **whoever can change those records in Jarl** decide
+which addresses a rule matches. Keep that in mind for rules that accept:
+
+* `within` limits it to networks you chose;
+* Housecarl's token only reads ([step 1](#1-a-user-for-housecarl-in-jarl));
+* give the records' zones only to people you'd let change the firewall,
+  and check Jarl's audit log for who changed what.
+
+**Don't use names that clients choose for themselves.** A name a DHCP
+server makes from the client's own hostname belongs to whoever asks for
+it: any guest could call itself `nas`. Name records that you made by hand,
+or that come from a DHCP reservation.
+
+### Seeing what a set holds
+
+```
+$ hc set jarl nas
+Set:        nas
+Within:     lan
+Holds:      10.10.0.20, 10.10.0.21
+Jarl read:  2026-10-23 14:02:11
+
+NAME                                 VIEW      ADDRESS          USED
+files.adbraun.lol → nas.adbraun.lol  internal  10.10.0.20       yes
+files.adbraun.lol → nas.adbraun.lol  internal  10.10.0.21       yes
+files.adbraun.lol → nas.adbraun.lol  internal  2001:db8:10::20  no: not within lan
+```
+
+The web UI's **Addresses…** button on the Sets page shows the same, and the
+status page lists the warnings: names that give nothing (`jarl_name`),
+addresses left out (`jarl_outside`), Jarl not read (`jarl_unreachable`).
+The API is `GET /sets/{name}/jarl` ([api.md](api.md#sets-from-jarl)).
+

docs/operations.md

@@ -83,7 +83,10 @@ sudo nft -c -f /var/lib/housecarl/ruleset.nft     # check it
 In shadow mode both files are shadow mode's, and the fallback filters
 nothing ([shadow.md](shadow.md#what-works-differently)).
 
-Dynamic sets start empty after a reboot. The saved ruleset has no
+Dynamic sets start empty after a reboot. Sets from Jarl have the
+addresses they last had, in the saved ruleset and again when housecarld
+starts, whether Jarl is reachable yet or not ([jarl.md](jarl.md#when-jarl-cant-be-reached)).
+The saved ruleset has no
 flowtable, since its devices may not exist yet: housecarld adds it when
 it starts, and whenever a flowtable device appears
 ([flowtable.md](flowtable.md#devices-that-come-and-go)).
@@ -154,16 +157,19 @@ table on its hook, so a drop in any of them wins.
 Every rule, NAT rule, built-in and policy has a counter. `hc rule list`,
 `hc forward list` and the web UI show packets; `hc counters` shows them
 all, with bytes. They count from housecarld's start, and carry across
-changes to the ruleset.
+changes to the ruleset. A deleted object's counter goes with it; an
+import with `--replace` gives every object a new ID, so its counters
+start again. A disabled rule keeps its count for when it is enabled.
 
 ## Quotas
 
 `hc quotas` (and the rules page) show what each quota used and when it
-resets; `hc rule reset-quota ID` starts one again. housecarld resets
+resets; `hc rule reset-quota ID` starts one again (`--address` one device's,
+`--give 5gbytes` a top-up until the next reset). housecarld resets
 quotas at midnight when their period ends (late, if it was stopped then),
-and saves their usage every five minutes and when it stops; after a
-reboot it puts it back. A reboot without a clean stop loses at most the
-last five minutes' count.
+and saves their usage every five minutes, after every change and when
+it stops; after a reboot it puts it back. A reboot without a clean stop
+loses at most the last five minutes' count.
 
 ## The log
 
@@ -306,6 +312,22 @@ down, the fallback and a missing ruleset. Reach it from where the input
 rules let the monitor in (a rule for the Checkmk server's address and
 port 8070).
 
+## Failed logins in the journal
+
+A failed login to the web UI or the API, and a refused API token, are
+written to the journal as well as the audit log, with the address first:
+
+```
+level=WARN msg="login failed" ip=203.0.113.9 user=admin reason="wrong username or password"
+level=WARN msg="token refused" ip=203.0.113.9 reason="wrong token secret"
+```
+
+Guard's `housecarl` preset, or a fail2ban filter, can ban such addresses
+([bans.md](bans.md)). The address comes before the user name, which a
+caller chooses, so a pattern anchored on `msg="login failed" ip=` can't
+be fooled by a name. (With `log.format: json` they are JSON objects with
+the same fields, in the same order.)
+
 ## Checks
 
 `housecarld check` validates the configuration in the database against

docs/permissions.md

@@ -8,7 +8,8 @@ else gets **grants**, `resource:access`:
 | Resource | read | write |
 |---|---|---|
 | `config` | settings, zones, sets, services, rules, NAT, the ruleset, history, interfaces, probation, changesets (the web UI shows the forms locked) | change them, stage and apply changesets (your own, or anyone's for administrators), undo, import, confirm and roll back; close connections; start and stop traces |
-| `sets` | dynamic sets' entries | add and remove entries |
+| `sets` | dynamic sets' entries, what sets from Jarl hold | add and remove entries |
+| `bans` | ban lists' bans, and the lists the grant names | ban and unban ([bans.md](bans.md)) |
 | `log` | hit counters, the log, connections, traces | – |
 | `audit` | the audit log | – |
 | `*` | all of the above | |
@@ -20,6 +21,10 @@ program, such as Steward's captive portal, which should be able to let a
 client in and nothing more. A dynamic set's entries need a `sets` grant
 even for those with `config:write`.
 
+A `bans` grant names ban lists the same way: `bans:write:web` may ban
+into the list `web` (and read it) and nothing else, the grant for Guard
+or fail2ban on the web server.
+
 Only administrators may delete other tables (`hc takeover`), and manage
 users and the certificate (`hc cert`, Server → Certificate).
 
@@ -27,8 +32,8 @@ users and the certificate (`hc cert`, Server → Certificate).
 
 | Role | Grants |
 |---|---|
-| `viewer` | `config:read sets:read log:read` |
-| `operator` | `config:write sets:write log:read audit:read` |
+| `viewer` | `config:read sets:read bans:read log:read` |
+| `operator` | `config:write sets:write bans:write log:read audit:read` |
 | `log` | `log:read`, e.g. for a monitoring script |
 
 ```sh
@@ -49,9 +54,13 @@ hc token create portal --user portal --grant sets:write:guests --expires 365d
 ```
 
 The secret is shown once; only its hash is stored. A restricted token can
-only create tokens with a subset of its own grants. The web UI only offers
-roles within what your account may do; a token with more would get no
-more than its user anyway.
+only create tokens with a subset of its own grants.
+
+In the web UI, Account → New token makes one of your own; an
+administrator makes one for another user with New token on that user's
+row under Users (`--user` in the CLI, `POST /users/{id}/tokens` in the
+API). The dialog only offers roles within what the token's user may do; a
+token with more would get no more than its user anyway.
 
 **Rotating** gives a token a new secret, keeping its ID, name and
 permissions, so only the programs that use it need updating:
@@ -82,6 +91,6 @@ on probation like any other.
 
 Logins (and failed ones), users, tokens, every configuration change (with
 its history entry), changesets created, applied and discarded,
-confirmations and rollbacks, imports, takeovers and
-dynamic set entries are recorded with who, from where and how: `session`,
+confirmations and rollbacks, imports, takeovers,
+dynamic set entries and bans are recorded with who, from where and how: `session`,
 `token` or `socket`.

docs/rules.md

@@ -83,6 +83,19 @@ change to the ruleset, and a restart of housecarld; a reboot empties
 them. A token can be limited to one set ([permissions.md](permissions.md)):
 that is how another program (Steward's captive portal) lets a client in.
 
+A set **from Jarl** holds the addresses of names in Jarl, the BIND
+manager: every A and AAAA record of each name, CNAMEs followed, read again
+every minute. Only addresses within the zones and networks it names are
+used, so a changed record can't open the firewall to anything else:
+
+```sh
+hc set add nas --jarl nas.example.com@internal --within lan
+hc set jarl nas                                      # what it holds, and why
+```
+
+Views, CNAMEs, what happens when Jarl can't be reached and the rest are in
+[jarl.md](jarl.md#sets-from-jarl).
+
 ## Services
 
 A service names ports of a protocol (`tcp`, `udp`, `sctp`) and ICMP
@@ -165,6 +178,40 @@ hc rule add forward --in wan --status dnat
 hc rule add forward --in wan -a drop
 ```
 
+### Matching everything but a few
+
+A field matches **any of** its entries, or with `--not-…` ("any but" in
+the web UI) anything else; it can't do both. "The LAN except the NAS" is
+still one rule: the zone says which network, and the addresses say which
+of it to leave out, because zones and addresses are different fields and
+a rule needs all of them to match.
+
+| What you want | One rule |
+|---|---|
+| the LAN, except the NAS | `--in lan --from nas --not-from` |
+| everyone on guest, except one device, has a quota | `--in guest --from tv --not-from --quota 10gbytes,over,daily` |
+| the internet, except one host | `--out wan --to blocked --not-to` |
+
+```sh
+# Each device on the LAN: 50 GB a month, but not the NAS (its backups)
+hc rule add forward --in lan --out wan --from nas --not-from --quota 50gbytes,over,per-source,monthly -a drop
+```
+
+Leaving part of an address range out ("10.0.0.0/8 except 10.0.5.0/24")
+when it isn't a zone takes one of:
+
+* **Two rules, the exception first**, when the exception gets the
+  opposite action: `--from 10.0.5.0/24 -a drop` above `--from
+  10.0.0.0/8`. There is no action that skips a rule and goes on, so this
+  doesn't work when the exception should just fall through to later
+  rules.
+* **Ranges around the hole**: `--from 10.0.0.0-10.0.4.255 --from
+  10.0.6.0-10.255.255.255`.
+* **A [raw rule](#raw-rules)**: `ip saddr 10.0.0.0/8 ip saddr != 10.0.5.0/24 accept`.
+
+There's no need to leave a zone out of other zones: an interface belongs
+to one zone, so "any of lan, guest" already leaves out everything else.
+
 ### Bandwidth and quotas
 
 A **byte rate** limits bandwidth: `--limit 20mbytes/second,over,per-source
@@ -186,8 +233,22 @@ hc rule add forward --in lan --out wan --quota 50gbytes,over,per-source,monthly=
 hc rule add forward --in guest --out wan --quota 10gbytes,over,daily -a drop
 hc quotas                      # what each used, and the next reset
 hc rule reset-quota 31         # start again now
+hc rule reset-quota 31 --address 192.168.1.23            # one device only
+hc rule reset-quota 31 --give 5gbytes --address 192.168.1.23
 ```
 
+`--give` is a top-up: it takes that much off what was used (never below
+zero), so the device gets 5 GB more until the quota's next reset, and the
+rule stays as it is. In the web UI, the quota's line under the rule
+opens its dialog: usage (each address's), resets, and **Reset** and
+**Give back…** for everyone or one address. Like a reset, these are
+done at once (audited, not staged or on probation); Housecarl puts the
+ruleset in force again with the new figure.
+
+In the web UI each quota's use is on its rule (with **Reset**), all of
+them together on the dashboard, and their history under **Traffic →
+Statistics**.
+
 | | |
 |---|---|
 | `per-source`, `per-destination` | each address its own allowance; without, one allowance for everything the rule matches |
@@ -195,12 +256,26 @@ hc rule reset-quota 31         # start again now
 
 nftables counts a quota but never resets it, and forgets it when its
 table is replaced: Housecarl carries what each quota used across every
-change and restart, saves it every five minutes (and when housecarld
-stops) for after a reboot, and resets quotas when their period ends.
+change and restart, saves it every five minutes (and after each change,
+and when housecarld stops) for after a reboot, and resets quotas when their period ends.
 A per-address quota counts an address: a device that gets a new one
 starts again. With Steward's reservations IPv4 addresses stay; IPv6 is
 grouped by /64 (below).
 
+Changing the amount, `over` or the resets keeps what was used. Changing
+how the quota counts carries what can be carried:
+
+| Change | What was used |
+|---|---|
+| per address to one total | the addresses' sum |
+| to wider groups (IPv6 /64 to /56) | added up per new group |
+| a total to per address | starts again: a total can't be split |
+| per source to per destination (or back) | starts again |
+| to finer groups (/64 to /128) | starts again: a group can't be split |
+
+A change that starts a quota again says so (warning `quota_restarts`),
+when it is staged for review and in `hc` (also with `-n`).
+
 **Rules with a quota or a byte rate count every packet.** The built-in
 that accepts established connections comes before your rules, so a rule
 there only sees each connection's first packet. Rules that count traffic
@@ -240,6 +315,13 @@ In shadow mode ([shadow.md](shadow.md)) a raw rule's final `drop` or
 (NAT, `meta mark set`, `jump`, `notrack`, a verdict map…) is left out,
 with a warning (`shadow_raw_left_out`).
 
+## Ban lists
+
+Programs such as Guard and fail2ban ban addresses into ban lists, and
+those bans come first of all in the input and forward chains (after
+loopback in input), before the built-ins and every rule. See
+[bans.md](bans.md).
+
 ## Built-ins
 
 Housecarl adds the rules every firewall needs before yours. Each can be
@@ -278,31 +360,67 @@ chain; from it: output; zone to zone: forward).
 
 ```
 $ hc matrix
-FROM \ TO  guest     lan       wan       firewall
-guest      block     block     block +1  block +3
-lan        block     block     allow     block +4
-wan        block +2  block +2  block +1  block +3
-firewall   allow     allow     allow     -
+FROM \ TO  guest         lan           wan         firewall
+guest      block *       block         partly +1   partly +4
+lan        block         block *       allow       partly +4
+wan        partly +1 -1  partly +1 -1  block -1 *  partly +3 -1
+firewall   allow         allow         allow       -
+
+Let through for part of the traffic:
+  guest → wan       http, https
+  guest → firewall  ICMPv6; ping; ssh from admins; dns
+  lan → firewall    ICMPv6; ping; ssh from admins; dns
+  wan → guest       1 port forward
+  wan → lan         1 port forward
+  wan → firewall    ICMPv6; DHCPv6; ssh from admins
+
+allow, block: every new connection; partly: some are let through, some not.
++N: rules that let part of the traffic through; -N: rules that block part of it. 'hc matrix FROM TO' lists them.
+*: a zone to itself: only traffic routed between its interfaces passes the firewall.
 ```
 
 Each cell walks that pair's rules in order, as nftables would, with the
 built-ins that act on new connections (ping from internal zones,
 ICMPv6, the DHCPv6 client, antispoofing, port forwards):
 
-* a rule that applies to the whole pair decides it ("allow", "block");
+* a rule that applies to the whole pair decides it;
 * a rule that applies to part of its traffic (some addresses, services,
-  times, rates, a quota) is an **exception** (+N), and the walk goes on;
+  times, rates, a quota) is an **exception**, and the walk goes on;
 * what's left falls to the deciding rule or the chain's policy.
 
+A cell reads **allow** or **block** when every new connection gets the
+same, and **partly** when exceptions let some through while the rest is
+blocked (or block some while the rest is allowed). **+N** counts the
+exceptions that let traffic through, **-N** those that block it. Under
+the grid (in the web UI, in each cell) is what the exceptions let
+through: their services, with the addresses they are limited to.
+
+A zone to itself (`*`, faded in the web UI) is mostly traffic that never
+reaches the firewall: within one interface's network it goes straight
+from host to host. Only what is routed between the zone's interfaces (or
+back out of the one it came in on) passes.
+
 `hc matrix guest wan` (or clicking the cell) lists the exceptions in
-order:
+order, with each rule's hits:
 
 ```
-guest → wan (the forward chain), new connections:
-  allowed  http, https   rule forward #14
-  blocked  the rest      forward policy
+guest → wan (the forward chain), new connections: partly allowed
+  VERDICT  WHAT         BY                HITS
+  allowed  http, https  rule forward #14  1520
+  blocked  the rest     forward policy    37
 ```
 
+The hits are the rule's packets since housecarld started, in all of its
+traffic: a rule without zones counts for every pair it covers. They are
+how you tell an exception that is used from one that isn't.
+
+A raw rule is read when it is a match followed by `accept`, `drop` or
+`reject` (with `counter` and `log` if you like): it counts as an exception
+for every pair of its chain, shown as `raw: …`. One that matches
+interfaces (the matrix can't tell which zones), jumps, translates, sets
+something or uses a verdict map shows as **unknown**: check it yourself.
+Raw rules have hits only if they say `counter`.
+
 A rule whose addresses all lie in networks directly connected to other
 zones is left out of a pair: traffic between those zones can't have them
 (`from wg_net` doesn't concern traffic coming in on the LAN). Routed

docs/shadow.md

@@ -116,6 +116,9 @@ firewall's NAT still does the work.
 * **No takeover, no closing connections.** `hc takeover` (deleting your
   firewall's tables) and `hc connections close` are refused (409,
   `hc` exits with 5): both would change your traffic.
+* **Bans** ([bans.md](bans.md)) are kept and their rules count what they
+  would drop (`[would drop]`), but nothing is dropped, and banning closes
+  no connections.
 * **The boot.** `housecarl-ruleset.service` loads the shadow ruleset at
   boot. Its fallback ([operations.md](operations.md#if-the-ruleset-fails-to-load-at-boot))
   is an empty table that filters nothing, since your firewall protects the

docs/validation.md

@@ -51,11 +51,16 @@ are unique per kind, ignoring case.
 
 | Code | | When |
 |---|---|---|
-| `set_name_reserved` | error | a set name starting with `meter_`, `conn_`, `quota_` or `stats_`: Housecarl's own sets (rate limits, quotas, statistics) use those |
+| `set_name_reserved` | error | a set name starting with `meter_`, `conn_`, `quota_`, `stats_` or `ban_`: Housecarl's own sets (rate limits, quotas, statistics, ban lists) use those |
 | `set_entry` | error | an entry that isn't an address, prefix (without host bits) or range |
-| `set_empty` | warning | a set (not dynamic) with no entries: rules using it match nothing |
+| `set_empty` | warning | a set (not dynamic, not from Jarl) with no entries: rules using it match nothing |
 | `set_dynamic_entries` | error | configured entries on a dynamic set: its entries come at run time |
 | `set_timeout` | error | a timeout on a set that isn't dynamic, or under a second |
+| `set_jarl_entries` | error | configured entries on a set from Jarl: its addresses are its names' ([jarl.md](jarl.md#sets-from-jarl)) |
+| `set_jarl_dynamic` | error | a set both dynamic and from Jarl |
+| `set_jarl_names` | error | a set from Jarl without names, with one that isn't a DNS name (a wildcard, say) or a bad view, or with a name twice |
+| `set_jarl_within` | error | a set from Jarl without `within`, or with an entry there that is neither a zone nor an address, network or range |
+| `set_jarl_anywhere` | warning | a set from Jarl `within 0.0.0.0/0` or `::/0`: any address may come in, so whoever changes the names in Jarl decides what it holds |
 | `service_empty` | error | a service with no entries |
 | `service_entry` | error | an entry that isn't `PROTO/PORTS` (`tcp`, `udp`, `sctp`; a port or range) or `icmp/TYPE`, `icmpv6/TYPE` with a type nftables knows |
 
@@ -97,6 +102,7 @@ These apply to rules, source NAT and redirects.
 | `rule_group` | error | a grouping prefix outside 1-32 (IPv4) or 1-128 (IPv6) |
 | `rule_traffic_accept` | error | a rule with a quota or a byte rate that accepts: it is checked before established connections are accepted, so it can only drop, reject or log |
 | `rule_every_packet_accept` | error | a rule checked against every packet (`every_packet`) that accepts: it comes before established connections are accepted, so it can only drop, reject or log |
+| `quota_restarts` | warning | a change makes a rule count its quota so that what it used can't carry over (a total to per address, per source to per destination, finer groups): it starts again. Only on the change that does it |
 | `flowtable_traffic` | warning | a forward rule checked against every packet (a quota, a byte rate, `every_packet`) while the flowtable is on: it only sees each connection's first packets |
 | `reject_with` | error | `tcp-reset` on a rule that matches more than TCP, or with an action other than reject |
 | `log_prefix` | error | a log prefix over 100 characters |
@@ -133,7 +139,25 @@ configuration: the dashboard and `hc status` show them.
 | `conntrack_full` | warning, *host* | the connection tracking table is over 80% full; once it is full, the kernel drops new connections. Raise `net.netfilter.nf_conntrack_max`, or find what opens so many ([stats.md](stats.md#warnings)) |
 | `takeover_pending` | warning, *host* | the table you imported from is still in force beside Housecarl's, so a packet must get past both; `hc takeover TABLE` deletes it once Housecarl's rules are right |
 | `shadow_unprotected` | warning, *host* | shadow mode, and no other table has a filter chain on the input hook: Housecarl's ruleset blocks nothing, and nothing else protects the machine. Load your firewall, or leave shadow mode ([shadow.md](shadow.md)) |
+| `jarl_name` | warning, *host* | a set from Jarl has a name that gives no addresses, and why: no A, AAAA or CNAME record, a wildcard only, a CNAME out of Jarl's zones or in a loop, below a delegation, a zone Jarl doesn't hold the records of, or in more than one view without one named ([jarl.md](jarl.md#what-a-name-gives)) |
+| `jarl_outside` | warning, *host* | an address a name has in Jarl is left out of its set: it isn't within the set's zones and networks ([jarl.md](jarl.md#within)) |
+| `jarl_unreachable` | warning, *host* | reading Jarl failed (unreachable, the token refused…), for every name or one; the sets keep the addresses they had ([jarl.md](jarl.md#when-jarl-cant-be-reached)) |
+| `jarl_not_configured` | warning, *host* | sets from Jarl, but no `jarl.server` in `housecarl.yaml`: they keep the addresses they last had |
 | `shadow_raw_left_out` | warning, *host* | shadow mode leaves this raw rule out: it does more to packets than accept, drop or reject (NAT, setting a mark or field, a jump, a verdict map…). Its hits aren't counted, and the rules after it see what it would have taken ([shadow.md](shadow.md#what-changes-in-the-ruleset)) |
 
 In shadow mode `nftables_service` and `takeover_pending` aren't raised:
 another firewall beside Housecarl is the point there.
+
+## Ban lists
+
+| Code | | When |
+|---|---|---|
+| `banlist_name` | error | not a valid name (as for zones and sets) |
+| `banlist_name_taken` | error | two ban lists with one name |
+| `banlist_scope` | error | a scope other than `firewall`, `hosts` or `everything` |
+| `banlist_hosts` | error | scope `hosts` without hosts, or hosts with another scope |
+| `banlist_address` | error | a host or never entry that isn't an address, prefix or range |
+| `unknown_set` | error | a host or never entry naming a set that doesn't exist |
+| `banlist_time` | error | negative times (but `max_time` -1), or a default longer than the longest |
+| `banlist_entries` | error | `max_entries` below 0 or above 1000000 |
+| `banlist_group` | error | `group_v6` outside 16 to 128 |

internal/api/types.go

@@ -326,6 +326,16 @@ type CertificateResponse struct {
 	Status *CertStatus `json:"status,omitempty"`
 }
 
+// QuotaReset is POST /rules/{ref}/reset-quota's optional body. Without
+// one the whole quota starts again. Address starts one address of a
+// per-address quota again (any address in its group: 10.0.10.23, or an
+// IPv6 address for its /64); Give takes that many bytes off what was used
+// instead (the address's, or every address's), until the next reset.
+type QuotaReset struct {
+	Address string `json:"address,omitempty"`
+	Give    int64  `json:"give,omitempty"`
+}
+
 // QuotaInfo is a rule's quota and what it used.
 type QuotaInfo struct {
 	RuleID int64       `json:"rule_id"`
@@ -384,6 +394,19 @@ type Connection struct {
 	Bytes   uint64 `json:"bytes,omitempty"`
 }
 
+// NamesInput asks for the names of addresses (POST /names).
+type NamesInput struct {
+	Addresses []string `json:"addresses"`
+}
+
+// Names are the names found for the inside addresses asked about, by
+// address; those without one (or still being looked up) are left out.
+// Enabled is false when names are off (names.enabled).
+type Names struct {
+	Enabled bool              `json:"enabled"`
+	Names   map[string]string `json:"names"`
+}
+
 // CloseConnections closes connections: these, or every one Search finds
 // (as GET /connections?q= does).
 type CloseConnections struct {
@@ -467,6 +490,26 @@ type MatrixCell struct {
 	DecidedBy  string            `json:"decided_by"`
 	RuleID     int64             `json:"rule_id,omitempty"` // the deciding rule
 	Exceptions []MatrixException `json:"exceptions"`
+	// Summary is the pair at a glance: allowed or blocked when every new
+	// connection gets the same, partly when some are let through and
+	// some not.
+	Summary string `json:"summary"`
+	// Allowed and Blocked count the exceptions that let part of the
+	// traffic through, and that block part of it.
+	Allowed int `json:"allowed"`
+	Blocked int `json:"blocked"`
+	// Open sums up what the allowing exceptions let through, shortest
+	// first in their order: "ssh", "dns", "5 port forwards".
+	Open []string `json:"open"`
+	// SameZone: from a zone to itself. Note says what of that traffic
+	// passes the firewall at all.
+	SameZone bool   `json:"same_zone,omitempty"`
+	Note     string `json:"note,omitempty"`
+	// Hits are the deciding rule's (or policy's) packets, all of its
+	// traffic since housecarld started (nil: no counter).
+	Hits *uint64 `json:"hits,omitempty"`
+	// Marks are the counters behind Hits.
+	Marks []string `json:"-"`
 }
 
 // MatrixException is a rule (or built-in) that decides for part of a
@@ -480,4 +523,84 @@ type MatrixException struct {
 	Verdict string `json:"verdict"`
 	// What it covers: "from trusted · ssh", "Monday 08:00–17:00".
 	What string `json:"what"`
+	// Short is What in a word or two, for the overview: its services,
+	// or else its first condition.
+	Short string `json:"short"`
+	// Hits are its packets, all of its traffic since housecarld started
+	// (a rule may apply to several pairs; nil: no counter).
+	Hits *uint64 `json:"hits,omitempty"`
+	// Marks are the counters behind Hits ("r12", "b-ping", "f3").
+	Marks []string `json:"-"`
+}
+
+// BanInput asks a ban list to ban an address (POST
+// /banlists/{list}/bans).
+type BanInput struct {
+	Address string `json:"address"`
+	// Protocol (tcp, udp) and Ports limit the ban; with neither, every
+	// port. Ports are numbers or service names, in a list or a string
+	// ("22", "ssh", "http,https"); "all", "0:65535" or "1-65535" mean
+	// every port. Ports without a protocol take the service's protocols,
+	// or for a number tcp and udp.
+	Protocol string          `json:"protocol,omitempty"`
+	Ports    json.RawMessage `json:"ports,omitempty"`
+	// Time is the ban's length in seconds: 0 the list's default, -1 its
+	// longest (or for ever). Longer than the list allows is cut down.
+	Time   int    `json:"time,omitempty"`
+	Source string `json:"source,omitempty"`
+	Reason string `json:"reason,omitempty"`
+}
+
+// BanResult is the answer to a ban: the bans made or renewed (one per
+// protocol and port), Existing for each already in force.
+type BanResult struct {
+	Bans []BanMade `json:"bans"`
+	// Closed counts the banned address's connections closed.
+	Closed int `json:"closed"`
+}
+
+// BanMade is a ban made, or renewed (Existing).
+type BanMade struct {
+	model.Ban
+	Existing bool `json:"existing,omitempty"`
+}
+
+// JarlSet is what a Jarl set holds and why (GET /sets/{ref}/jarl).
+type JarlSet struct {
+	Set string `json:"set"`
+	// Configured is whether housecarl.yaml names a Jarl server.
+	Configured bool `json:"configured"`
+	// Read is when housecarld last read Jarl's zones; Error why the last
+	// try failed (the set keeps the addresses it had).
+	Read  *time.Time `json:"read,omitempty"`
+	Error string     `json:"error,omitempty"`
+	// Entries are the addresses the set holds now.
+	Entries []string   `json:"entries"`
+	Names   []JarlName `json:"names"`
+	Within  []string   `json:"within"`
+}
+
+// JarlName is one of a Jarl set's names: what Jarl gave for it.
+type JarlName struct {
+	Name string `json:"name"`
+	View string `json:"view,omitempty"` // as configured ("": the only view that has it)
+	// Found is the view it was found in.
+	Found string `json:"found_view,omitempty"`
+	// Chain are the CNAME targets followed, in order.
+	Chain     []string      `json:"chain,omitempty"`
+	Addresses []JarlAddress `json:"addresses"`
+	// Problem is why Jarl's records give it no addresses.
+	Problem string `json:"problem,omitempty"`
+	// Checked is when Jarl last answered for it; Error why the last try
+	// failed (its addresses are those of Checked).
+	Checked *time.Time `json:"checked,omitempty"`
+	Error   string     `json:"error,omitempty"`
+}
+
+// JarlAddress is an address a name has in Jarl: Used if the set holds
+// it, else why not.
+type JarlAddress struct {
+	Address string `json:"address"`
+	Used    bool   `json:"used"`
+	Why     string `json:"why,omitempty"`
 }

internal/auth/auth.go

@@ -147,13 +147,14 @@ func NewSessionID() (id, csrf string) {
 const (
 	ResConfig = "config" // the firewall configuration, its history and imports
 	ResSets   = "sets"   // dynamic sets' entries (a grant may name the sets)
+	ResBans   = "bans"   // ban lists' bans (a grant may name the lists)
 	ResLog    = "log"    // counters, the drop log and the status
 	ResAudit  = "audit"  // the audit log
 	ResAll    = "*"
 )
 
 // Resources lists them in display order.
-var Resources = []string{ResConfig, ResSets, ResLog, ResAudit}
+var Resources = []string{ResConfig, ResSets, ResBans, ResLog, ResAudit}
 
 // Access levels.
 const (
@@ -163,8 +164,8 @@ const (
 
 // Roles are ready-made sets of grants.
 var Roles = map[string][]model.Grant{
-	"viewer":   {{Resource: ResConfig, Access: Read}, {Resource: ResSets, Access: Read}, {Resource: ResLog, Access: Read}},
-	"operator": {{Resource: ResConfig, Access: Write}, {Resource: ResSets, Access: Write}, {Resource: ResLog, Access: Read}, {Resource: ResAudit, Access: Read}},
+	"viewer":   {{Resource: ResConfig, Access: Read}, {Resource: ResSets, Access: Read}, {Resource: ResBans, Access: Read}, {Resource: ResLog, Access: Read}},
+	"operator": {{Resource: ResConfig, Access: Write}, {Resource: ResSets, Access: Write}, {Resource: ResBans, Access: Write}, {Resource: ResLog, Access: Read}, {Resource: ResAudit, Access: Read}},
 	"log":      {{Resource: ResLog, Access: Read}},
 }
 
@@ -179,12 +180,13 @@ func RoleNames() []string {
 }
 
 // ParseGrant reads "resource:access" ("log:read", "*:write"), and for
-// sets optionally the sets it is limited to ("sets:write:guest,portal").
+// sets and bans optionally the sets or ban lists it is limited to
+// ("sets:write:guest,portal", "bans:write:web").
 func ParseGrant(s string) (model.Grant, error) {
 	parts := strings.SplitN(strings.TrimSpace(s), ":", 3)
 	g := model.Grant{Resource: strings.ToLower(parts[0])}
 	if len(parts) < 2 {
-		return g, fmt.Errorf("grant %q: write it as resource:access, e.g. log:read, or sets:write:SET1,SET2", s)
+		return g, fmt.Errorf("grant %q: write it as resource:access, e.g. log:read, sets:write:SET1,SET2 or bans:write:LIST", s)
 	}
 	g.Access = strings.ToLower(parts[1])
 	if len(parts) == 3 {
@@ -211,8 +213,8 @@ func ValidateGrant(g *model.Grant) error {
 	if g.Access != Read && g.Access != Write {
 		return fmt.Errorf("access must be read or write, not %q", g.Access)
 	}
-	if len(g.Sets) > 0 && g.Resource != ResSets {
-		return fmt.Errorf("only a sets grant can name sets (sets:write:%s)", strings.Join(g.Sets, ","))
+	if len(g.Sets) > 0 && g.Resource != ResSets && g.Resource != ResBans {
+		return fmt.Errorf("only a sets or bans grant can name sets or ban lists (sets:write:%s)", strings.Join(g.Sets, ","))
 	}
 	return nil
 }
@@ -272,20 +274,26 @@ func covers(gs []model.Grant, resource string, write bool) bool {
 
 // CanSet reports whether the principal may read or change the entries of
 // a dynamic set: a sets grant covers it if it names no sets, or names it.
-func (p *Principal) CanSet(name string, write bool) bool {
+func (p *Principal) CanSet(name string, write bool) bool { return p.canNamed(ResSets, name, write) }
+
+// CanBan reports whether the principal may read or change the bans of a
+// ban list: a bans grant covers it if it names no lists, or names it.
+func (p *Principal) CanBan(list string, write bool) bool { return p.canNamed(ResBans, list, write) }
+
+func (p *Principal) canNamed(resource, name string, write bool) bool {
 	if p == nil || p.User == nil {
 		return false
 	}
-	allowed := p.User.Admin || coversSet(p.User.Grants, name, write)
+	allowed := p.User.Admin || coversNamed(p.User.Grants, resource, name, write)
 	if p.Token != nil && p.Token.Grants != nil {
-		allowed = allowed && coversSet(p.Token.Grants, name, write)
+		allowed = allowed && coversNamed(p.Token.Grants, resource, name, write)
 	}
 	return allowed
 }
 
-func coversSet(gs []model.Grant, name string, write bool) bool {
+func coversNamed(gs []model.Grant, resource, name string, write bool) bool {
 	for _, g := range gs {
-		if (g.Resource != ResAll && g.Resource != ResSets) || (write && g.Access != Write) {
+		if (g.Resource != ResAll && g.Resource != resource) || (write && g.Access != Write) {
 			continue
 		}
 		if len(g.Sets) == 0 {

internal/config/config.go

@@ -44,6 +44,19 @@ type Config struct {
 	// Shadow loads the ruleset without letting it block, reject or
 	// translate anything, beside the firewall in force (docs/shadow.md).
 	Shadow Shadow `yaml:"shadow"`
+	// Names shows inside addresses' names, by reverse lookups
+	// (docs/configuration.md).
+	Names Names `yaml:"names"`
+}
+
+// Names configures the reverse lookups that put names beside inside
+// addresses in the web UI and hc.
+type Names struct {
+	Enabled bool `yaml:"enabled"`
+	// Resolver is a DNS server ("10.10.0.1:53"; "": the system's).
+	Resolver string `yaml:"resolver"`
+	// Cache is how long a name is kept.
+	Cache Duration `yaml:"cache"`
 }
 
 // Shadow is shadow mode: Housecarl's ruleset is loaded and counts, logs
@@ -140,6 +153,8 @@ type Jarl struct {
 	// CACert is a PEM file with a CA to trust for Jarl's certificate.
 	CACert   string `yaml:"ca_cert"`
 	Insecure bool   `yaml:"insecure"`
+	// Refresh is how often the Jarl sets' names are read (docs/jarl.md).
+	Refresh Duration `yaml:"refresh"`
 }
 
 // Enabled reports whether a Jarl server is configured.
@@ -224,6 +239,8 @@ func Default() *Config {
 		Stats: Stats{Enabled: true, Database: "/var/lib/housecarl/stats.db", TopN: 100,
 			Retention: StatsRetention{Minute: Duration(7 * 24 * time.Hour), Hour: Duration(90 * 24 * time.Hour), Day: Duration(730 * 24 * time.Hour)}},
 		Shadow: Shadow{Position: ShadowAfter},
+		Names:  Names{Enabled: true, Cache: Duration(10 * time.Minute)},
+		Jarl:   Jarl{Refresh: Duration(time.Minute)},
 		TLS:    TLS{ACME: ACME{Directory: "letsencrypt-staging", Resolvers: []string{"1.1.1.1:53", "9.9.9.9:53", "8.8.8.8:53"}, CheckPropagation: true}},
 	}
 }
@@ -298,6 +315,17 @@ func (c *Config) check() error {
 	if c.Shadow.Position != ShadowAfter && c.Shadow.Position != ShadowBefore {
 		return fmt.Errorf("shadow.position must be after or before")
 	}
+	if c.Names.Resolver != "" {
+		if _, err := netip.ParseAddrPort(c.Names.Resolver); err != nil {
+			return fmt.Errorf("names.resolver must be an address and port, such as 10.10.0.1:53")
+		}
+	}
+	if c.Names.Cache <= 0 {
+		return fmt.Errorf("names.cache must be a duration, such as 10m")
+	}
+	if c.Jarl.Refresh < Duration(10*time.Second) {
+		return fmt.Errorf("jarl.refresh must be a duration of 10s or more, such as 1m")
+	}
 	return nil
 }
 

internal/engine/engine.go

@@ -191,6 +191,7 @@ func (e *Engine) commit(ctx context.Context, p *auth.Principal, description stri
 	// Only report warnings the change brings; old ones are on the status
 	// page.
 	res.Warnings = newProblems(validate.Check(e.state, e.env()), problems)
+	res.Warnings = append(res.Warnings, quotaRestarts(e.state, next)...)
 	if e.Firewall != nil {
 		if err := e.Firewall.Check(ctx, next); err != nil {
 			return res, &Error{Kind: KindFirewall, Message: "nftables refused the ruleset: " + err.Error()}
@@ -230,6 +231,23 @@ func (e *Engine) commit(ctx context.Context, p *auth.Principal, description stri
 	return res, nil
 }
 
+// quotaRestarts warns of the rules whose quota starts again because they
+// now count it in a way what they used can't be carried to.
+func quotaRestarts(before, after *model.State) []validate.Problem {
+	was := map[int64]*model.Rule{}
+	for _, r := range before.Rules {
+		was[r.ID] = r
+	}
+	var out []validate.Problem
+	for _, r := range after.Rules {
+		if carry, why := model.QuotaCarry(was[r.ID], r); carry == model.QuotaRestarts {
+			out = append(out, validate.Problem{Severity: validate.Warning, Code: "quota_restarts", Object: r.Label(),
+				Message: "its quota starts again: " + why})
+		}
+	}
+	return out
+}
+
 func newProblems(before, after []validate.Problem) []validate.Problem {
 	seen := map[string]bool{}
 	for _, p := range before {
@@ -304,6 +322,24 @@ func Undo(st *model.State, h *model.HistoryEntry) error {
 	return nil
 }
 
+// Rewind applies a history entry backwards to st without Undo's check:
+// stepping back through the entries newest first brings back the
+// configuration as it was before each.
+func Rewind(st *model.State, h *model.HistoryEntry) error {
+	for i := len(h.Changes) - 1; i >= 0; i-- {
+		c := h.Changes[i]
+		if c.Kind == model.KindSettings && c.Before == nil {
+			continue
+		}
+		if err := put(st, c.Kind, c.ID, c.Before); err != nil {
+			return err
+		}
+	}
+	// put appends what it brings back; its position puts it in place.
+	st.Sort()
+	return nil
+}
+
 // Replace makes the configuration next as a whole (imports).
 func (e *Engine) Replace(ctx context.Context, p *auth.Principal, description string, opts Options, next *model.State) (*Result, error) {
 	e.mu.Lock()
@@ -462,6 +498,15 @@ func Normalize(st *model.State) {
 	for _, x := range st.Sets {
 		x.Name = strings.TrimSpace(x.Name)
 		x.Entries = normAddrs(x.Entries)
+		if j := x.Jarl; j != nil {
+			for i, n := range j.Names {
+				j.Names[i] = model.ParseJarlName(n.Name)
+				if n.View != "" {
+					j.Names[i].View = strings.TrimSpace(n.View)
+				}
+			}
+			j.Within = normAddrs(j.Within) // zone names stay as they are
+		}
 	}
 	for _, x := range st.Services {
 		x.Name = strings.TrimSpace(x.Name)
@@ -491,6 +536,12 @@ func Normalize(st *model.State) {
 		normMatch(&x.Match)
 		x.ToPort = normPorts(x.ToPort)
 	}
+	for _, b := range st.BanLists {
+		b.Name = strings.TrimSpace(b.Name)
+		b.Scope = strings.ToLower(strings.TrimSpace(b.Scope))
+		b.Hosts = normAddrs(b.Hosts)
+		b.Never = normAddrs(b.Never)
+	}
 	// Positions are fractions after insertions between rules; renumber
 	// only when two have come too close to put another between.
 	st.Sort()

internal/engine/engine_test.go

@@ -173,3 +173,49 @@ func TestPositionsStayStableUntilCrowded(t *testing.T) {
 		t.Errorf("order %v", order)
 	}
 }
+
+// TestQuotaRestartsWarns: a change that counts a quota so what it used
+// can't carry over warns; one that can (to a total, wider groups) doesn't.
+func TestQuotaRestartsWarns(t *testing.T) {
+	e := newEngine(t)
+	ctx := context.Background()
+	var id int64
+	if _, err := e.Apply(ctx, admin, "", Options{}, func(st *model.State, newID func() int64) error {
+		id = newID()
+		st.Rules = append(st.Rules, &model.Rule{ID: id, Chain: "forward", Action: "drop", Quota: &model.Quota{Bytes: 1 << 30, Over: true, PerSource: true}})
+		return nil
+	}); err != nil {
+		t.Fatal(err)
+	}
+	change := func(f func(r *model.Rule)) []string {
+		res, err := e.Apply(ctx, admin, "", Options{DryRun: true}, func(st *model.State, _ func() int64) error {
+			f(st.ByID(model.KindRule, id).(*model.Rule))
+			return nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		var codes []string
+		for _, w := range res.Warnings {
+			if w.Code == "quota_restarts" {
+				codes = append(codes, w.Message)
+			}
+		}
+		return codes
+	}
+	if w := change(func(r *model.Rule) { r.Quota.PerSource, r.Quota.PerDestination = false, true }); len(w) != 1 || !strings.Contains(w[0], "per source can't be counted per destination") {
+		t.Errorf("per source to per destination: %v", w)
+	}
+	if w := change(func(r *model.Rule) { r.Quota.PerSource = false }); len(w) != 0 {
+		t.Errorf("to a total (summed): %v", w)
+	}
+	if w := change(func(r *model.Rule) { r.GroupV6 = 56 }); len(w) != 0 {
+		t.Errorf("wider groups: %v", w)
+	}
+	if w := change(func(r *model.Rule) { r.GroupV6 = 128 }); len(w) != 1 {
+		t.Errorf("finer groups: %v", w)
+	}
+	if w := change(func(r *model.Rule) { r.Quota.Bytes = 2 << 30 }); len(w) != 0 {
+		t.Errorf("another amount: %v", w)
+	}
+}

internal/jarl/jarl.go

@@ -247,3 +247,32 @@ func (c *Client) SetTXT(ctx context.Context, name, value string, zones []Zone, s
 	}
 	return c.do(ctx, http.MethodPost, "/apply", batch{Description: desc, Ops: ops, DryRun: dryRun}, nil)
 }
+
+// ZoneInfo is a zone as Jarl lists it, of any type.
+type ZoneInfo struct {
+	ID       int64  `json:"id"`
+	Name     string `json:"name"` // "example.com."
+	View     string `json:"view,omitempty"`
+	Type     string `json:"type"`
+	InView   string `json:"in_view,omitempty"` // type in-view: the view whose zone it serves
+	Disabled bool   `json:"disabled,omitempty"`
+}
+
+// AllZones lists every zone the token can see, of any type.
+func (c *Client) AllZones(ctx context.Context) ([]ZoneInfo, error) {
+	var zs []ZoneInfo
+	return zs, c.do(ctx, http.MethodGet, "/zones", nil, &zs)
+}
+
+// Record is a record as Jarl lists it.
+type Record struct {
+	Name string `json:"name"` // "nas.example.com."
+	Type string `json:"type"`
+	Data string `json:"data"`
+}
+
+// Records lists a zone's enabled records (zone: its ID).
+func (c *Client) Records(ctx context.Context, zone int64) ([]Record, error) {
+	var rs []Record
+	return rs, c.do(ctx, http.MethodGet, fmt.Sprintf("/zones/%d/records?disabled=0", zone), nil, &rs)
+}

internal/jarlsets/jarlsets.go

@@ -0,0 +1,767 @@
+// Package jarlsets fills the sets whose addresses come from Jarl. It reads
+// the A and AAAA records of the sets' names through Jarl's API, following
+// CNAMEs within the zones Jarl holds, every minute or so, and keeps what it
+// last read (in the database too) for when Jarl can't be reached. The
+// firewall gets, for each set, the addresses that lie within what the set
+// allows (zones' connected networks, or networks it names); the others are
+// left out and reported. When what the sets hold changes, the ruleset is
+// applied again (no history entry: the configuration didn't change).
+package jarlsets
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/netip"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+
+	"housecarl/internal/api"
+	"housecarl/internal/jarl"
+	"housecarl/internal/model"
+	"housecarl/internal/validate"
+)
+
+// MetaKey is the database meta key holding what was last read.
+const MetaKey = "jarl_sets"
+
+// maxChain is how many CNAMEs are followed for one name.
+const maxChain = 8
+
+// Source is Jarl (internal/jarl.Client).
+type Source interface {
+	AllZones(ctx context.Context) ([]jarl.ZoneInfo, error)
+	Records(ctx context.Context, zone int64) ([]jarl.Record, error)
+}
+
+// Lookup is what Jarl gave for one name in one view.
+type Lookup struct {
+	Name      string   `json:"name"`
+	View      string   `json:"view,omitempty"`
+	Found     string   `json:"found,omitempty"`
+	Chain     []string `json:"chain,omitempty"`
+	Addresses []string `json:"addresses,omitempty"`
+	// Problem is why Jarl's records give no addresses (Jarl answered).
+	Problem string `json:"problem,omitempty"`
+	// Checked is when Jarl last answered; Error why the last try failed.
+	Checked time.Time `json:"checked"`
+	Error   string    `json:"error,omitempty"`
+}
+
+// saved is what the database keeps.
+type saved struct {
+	Lookups map[string]*Lookup `json:"lookups"`
+	// Nets are the zones' connected networks last seen, for when a zone's
+	// interfaces have no address (at boot, a link down).
+	Nets map[string][]netip.Prefix `json:"nets,omitempty"`
+}
+
+// Resolver keeps the Jarl sets' addresses.
+type Resolver struct {
+	// Source is Jarl (nil: not configured; the sets keep what was read).
+	Source Source
+	// Interval is how often Jarl is read (default a minute).
+	Interval time.Duration
+	// State is the configuration in force.
+	State func() *model.State
+	// Connected are the networks connected to the firewall, with their
+	// zones.
+	Connected func(st *model.State) map[netip.Prefix]string
+	// Apply puts the sets' new addresses in force.
+	Apply func(ctx context.Context) error
+	// Audit records a change of a set's addresses.
+	Audit func(ctx context.Context, set, detail string)
+	// Load and Save read and write the database's copy.
+	Load func(ctx context.Context) (string, error)
+	Save func(ctx context.Context, value string) error
+	Log  *slog.Logger
+
+	run  sync.Mutex // one refresh at a time
+	mu   sync.Mutex
+	data saved
+	// applied is what the ruleset in force holds (known after an apply).
+	applied map[string][]string
+	known   bool
+	read    time.Time
+	err     string
+	kick    chan struct{}
+	now     func() time.Time
+}
+
+func (r *Resolver) init() {
+	if r.data.Lookups == nil {
+		r.data.Lookups = map[string]*Lookup{}
+	}
+	if r.data.Nets == nil {
+		r.data.Nets = map[string][]netip.Prefix{}
+	}
+	if r.kick == nil {
+		r.kick = make(chan struct{}, 1)
+	}
+	if r.now == nil {
+		r.now = time.Now
+	}
+	if r.Log == nil {
+		r.Log = slog.Default()
+	}
+}
+
+// Restore reads what was saved before housecarld (or the machine)
+// stopped. Call it before the first apply.
+func (r *Resolver) Restore(ctx context.Context) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.init()
+	if r.Load == nil {
+		return
+	}
+	v, err := r.Load(ctx)
+	if err != nil || v == "" {
+		return
+	}
+	var s saved
+	if err := json.Unmarshal([]byte(v), &s); err != nil {
+		r.Log.Warn("the saved Jarl set addresses can't be read; reading Jarl again", "err", err)
+		return
+	}
+	if s.Lookups != nil {
+		r.data.Lookups = s.Lookups
+	}
+	if s.Nets != nil {
+		r.data.Nets = s.Nets
+	}
+}
+
+// Kick has the next refresh happen now (after a change of the
+// configuration: a new name).
+func (r *Resolver) Kick() {
+	r.mu.Lock()
+	r.init()
+	k := r.kick
+	r.mu.Unlock()
+	select {
+	case k <- struct{}{}:
+	default:
+	}
+}
+
+// Run reads Jarl until ctx ends.
+func (r *Resolver) Run(ctx context.Context) {
+	r.mu.Lock()
+	r.init()
+	k := r.kick
+	every := r.Interval
+	r.mu.Unlock()
+	if every <= 0 {
+		every = time.Minute
+	}
+	t := time.NewTicker(every)
+	defer t.Stop()
+	for {
+		r.Refresh(ctx)
+		select {
+		case <-ctx.Done():
+			return
+		case <-t.C:
+		case <-k:
+		}
+	}
+}
+
+// Refresh reads Jarl now and puts what changed in force.
+func (r *Resolver) Refresh(ctx context.Context) {
+	r.run.Lock()
+	defer r.run.Unlock()
+	st := r.State()
+	r.read1(ctx, st)
+	r.sync(ctx, st)
+}
+
+// needed are the names the sets of st look up, by key.
+func needed(st *model.State) map[string]model.JarlName {
+	out := map[string]model.JarlName{}
+	for _, s := range st.Sets {
+		if s.Jarl == nil {
+			continue
+		}
+		for _, n := range s.Jarl.Names {
+			out[n.String()] = n
+		}
+	}
+	return out
+}
+
+// read1 reads every name from Jarl once.
+func (r *Resolver) read1(ctx context.Context, st *model.State) {
+	names := needed(st)
+	r.mu.Lock()
+	r.init()
+	src := r.Source
+	r.mu.Unlock()
+	// The zones' networks, for when they can't be seen (Entries).
+	r.rememberNets(st)
+	if src == nil || len(names) == 0 {
+		r.mu.Lock()
+		changed := false
+		for k := range r.data.Lookups {
+			if _, ok := names[k]; !ok {
+				delete(r.data.Lookups, k)
+				changed = true
+			}
+		}
+		r.mu.Unlock()
+		if changed {
+			r.save(ctx)
+		}
+		return
+	}
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+	zones, err := src.AllZones(ctx)
+	now := r.now()
+	results := map[string]*Lookup{}
+	if err == nil {
+		l := &lookup{ctx: ctx, src: src, zones: zones, records: map[int64][]jarl.Record{}, errs: map[int64]error{}}
+		for k, n := range names {
+			results[k] = l.resolve(n)
+		}
+	}
+	r.mu.Lock()
+	if err != nil {
+		r.err = err.Error()
+	} else {
+		r.err, r.read = "", now
+	}
+	for k, n := range names {
+		old := r.data.Lookups[k]
+		res := results[k]
+		switch {
+		case res != nil && res.Error == "":
+			res.Checked = now
+			r.data.Lookups[k] = res
+		case old != nil:
+			// Keep what Jarl last said.
+			old.Error = errText(err, res)
+		default:
+			r.data.Lookups[k] = &Lookup{Name: n.Name, View: n.View, Error: errText(err, res)}
+		}
+		if err != nil || res != nil && res.Error != "" {
+			r.Log.Warn("reading a Jarl set's name failed; the set keeps the addresses it had", "name", n.String(), "err", r.data.Lookups[k].Error)
+		}
+	}
+	for k := range r.data.Lookups {
+		if _, ok := names[k]; !ok {
+			delete(r.data.Lookups, k)
+		}
+	}
+	r.mu.Unlock()
+	r.save(ctx)
+}
+
+func errText(err error, res *Lookup) string {
+	if err != nil {
+		return err.Error()
+	}
+	return res.Error
+}
+
+func (r *Resolver) save(ctx context.Context) {
+	if r.Save == nil {
+		return
+	}
+	r.mu.Lock()
+	b, err := json.Marshal(r.data)
+	r.mu.Unlock()
+	if err == nil {
+		err = r.Save(ctx, string(b))
+	}
+	if err != nil {
+		r.Log.Warn("saving the Jarl set addresses failed", "err", err)
+	}
+}
+
+// rememberNets keeps each zone's connected networks.
+func (r *Resolver) rememberNets(st *model.State) {
+	if r.Connected == nil {
+		return
+	}
+	now := zoneNets(r.Connected(st))
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	for z, ps := range now {
+		r.data.Nets[z] = ps
+	}
+}
+
+func zoneNets(conn map[netip.Prefix]string) map[string][]netip.Prefix {
+	out := map[string][]netip.Prefix{}
+	for p, z := range conn {
+		out[z] = append(out[z], p)
+	}
+	for _, ps := range out {
+		sort.Slice(ps, func(i, j int) bool { return ps[i].String() < ps[j].String() })
+	}
+	return out
+}
+
+// sync applies the ruleset again if the sets' addresses changed.
+func (r *Resolver) sync(ctx context.Context, st *model.State) {
+	want := r.Entries(st)
+	r.mu.Lock()
+	known, applied := r.known, r.applied
+	r.mu.Unlock()
+	// No Jarl sets, nothing to do (and an empty configuration is never
+	// applied: its policies would close the machine).
+	if len(want) == 0 || st.Empty() || known && sameEntries(applied, want) || r.Apply == nil {
+		return
+	}
+	if err := r.Apply(ctx); err != nil {
+		r.Log.Error("putting the Jarl sets' new addresses in force failed", "err", err)
+		return
+	}
+	for _, s := range st.Sets {
+		if s.Jarl == nil {
+			continue
+		}
+		add, del := diff(applied[s.Name], want[s.Name])
+		if len(add) == 0 && len(del) == 0 {
+			continue
+		}
+		var parts []string
+		if len(add) > 0 {
+			parts = append(parts, "added "+strings.Join(add, ", "))
+		}
+		if len(del) > 0 {
+			parts = append(parts, "removed "+strings.Join(del, ", "))
+		}
+		detail := strings.Join(parts, "; ")
+		r.Log.Info("a Jarl set's addresses changed", "set", s.Name, "change", detail)
+		if r.Audit != nil {
+			r.Audit(ctx, s.Name, detail)
+		}
+	}
+}
+
+func sameEntries(a, b map[string][]string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for k, v := range a {
+		w, ok := b[k]
+		if !ok || strings.Join(v, ",") != strings.Join(w, ",") {
+			return false
+		}
+	}
+	return true
+}
+
+func diff(old, now []string) (add, del []string) {
+	was := map[string]bool{}
+	for _, a := range old {
+		was[a] = true
+	}
+	is := map[string]bool{}
+	for _, a := range now {
+		is[a] = true
+		if !was[a] {
+			add = append(add, a)
+		}
+	}
+	for _, a := range old {
+		if !is[a] {
+			del = append(del, a)
+		}
+	}
+	return add, del
+}
+
+// Applied implements nft.JarlSets.
+func (r *Resolver) Applied(entries map[string][]string) {
+	c := map[string][]string{}
+	for k, v := range entries {
+		c[k] = append([]string(nil), v...)
+	}
+	r.mu.Lock()
+	r.applied, r.known = c, true
+	r.mu.Unlock()
+}
+
+// Entries implements nft.JarlSets: every Jarl set of st (empty or not),
+// with the addresses its names have that lie within what it allows.
+func (r *Resolver) Entries(st *model.State) map[string][]string {
+	out := map[string][]string{}
+	nets := r.nets(st)
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.init()
+	for _, s := range st.Sets {
+		if s.Jarl == nil {
+			continue
+		}
+		seen := map[string]bool{}
+		list := []string{}
+		for _, n := range s.Jarl.Names {
+			lu := r.data.Lookups[n.String()]
+			if lu == nil {
+				continue
+			}
+			for _, a := range lu.Addresses {
+				if seen[a] || allowed(a, s.Jarl.Within, nets) != "" {
+					continue
+				}
+				seen[a] = true
+				list = append(list, a)
+			}
+		}
+		sortAddrs(list)
+		out[s.Name] = list
+	}
+	return out
+}
+
+// nets are the zones' connected networks: now, or as last seen.
+func (r *Resolver) nets(st *model.State) map[string][]netip.Prefix {
+	var now map[string][]netip.Prefix
+	if r.Connected != nil {
+		now = zoneNets(r.Connected(st))
+	}
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.init()
+	out := map[string][]netip.Prefix{}
+	for _, z := range st.Zones {
+		if ps := now[z.Name]; len(ps) > 0 {
+			out[z.Name] = ps
+		} else {
+			out[z.Name] = r.data.Nets[z.Name]
+		}
+	}
+	return out
+}
+
+func sortAddrs(list []string) {
+	sort.Slice(list, func(i, j int) bool {
+		a, _ := netip.ParseAddr(list[i])
+		b, _ := netip.ParseAddr(list[j])
+		return a.Less(b)
+	})
+}
+
+// allowed says why an address isn't let in ("" if it is).
+func allowed(addr string, within []string, nets map[string][]netip.Prefix) string {
+	a, err := netip.ParseAddr(addr)
+	if err != nil {
+		return "not an address"
+	}
+	a = a.Unmap()
+	switch {
+	case a.IsUnspecified(), a.IsLoopback(), a.IsMulticast():
+		return "not a host's address (unspecified, loopback or multicast)"
+	}
+	for _, w := range within {
+		if l, err := model.ParseAddress(w); err == nil {
+			if l.Contains(a) {
+				return ""
+			}
+			continue
+		}
+		for _, p := range nets[w] {
+			if p.Contains(a) {
+				return ""
+			}
+		}
+	}
+	return "not within " + strings.Join(within, ", ")
+}
+
+// ---- looking names up
+
+// lookup reads Jarl's records for one refresh.
+type lookup struct {
+	ctx     context.Context
+	src     Source
+	zones   []jarl.ZoneInfo
+	records map[int64][]jarl.Record
+	errs    map[int64]error
+}
+
+func fqdn(n string) string {
+	n = strings.ToLower(strings.TrimSpace(n))
+	if !strings.HasSuffix(n, ".") {
+		n += "."
+	}
+	return n
+}
+
+func under(name, zone string) bool {
+	return zone == "." || name == zone || strings.HasSuffix(name, "."+zone)
+}
+
+func short(n string) string { return strings.TrimSuffix(n, ".") }
+
+// zoneFor finds the zone of Jarl's that answers for name in view ("":
+// the only view whose zones hold it). It returns the zone, the view, or
+// why there is none.
+func (l *lookup) zoneFor(name, view string) (*jarl.ZoneInfo, string, string) {
+	if view == "" {
+		views := map[string]bool{}
+		for _, z := range l.zones {
+			if z.Type != "hint" && under(name, fqdn(z.Name)) {
+				views[z.View] = true
+			}
+		}
+		switch len(views) {
+		case 0:
+			return nil, "", fmt.Sprintf("no zone in Jarl holds %s (or the token can't see it)", short(name))
+		case 1:
+			for v := range views {
+				view = v
+			}
+		default:
+			var vs []string
+			for v := range views {
+				vs = append(vs, v)
+			}
+			sort.Strings(vs)
+			return nil, "", fmt.Sprintf("%s is in Jarl's views %s: name the view, such as %s@%s", short(name), strings.Join(vs, ", "), short(name), vs[0])
+		}
+	}
+	var best *jarl.ZoneInfo
+	for i := range l.zones {
+		z := &l.zones[i]
+		zn := fqdn(z.Name)
+		if z.Type == "hint" || !strings.EqualFold(z.View, view) || !under(name, zn) {
+			continue
+		}
+		if best == nil || len(zn) > len(fqdn(best.Name)) {
+			best = z
+		}
+	}
+	where := ""
+	if view != "" {
+		where = " in view " + view
+	}
+	if best == nil {
+		return nil, view, fmt.Sprintf("no zone%s holds %s in Jarl (or the token can't see it)", where, short(name))
+	}
+	if best.Type == "in-view" {
+		var served *jarl.ZoneInfo
+		for i := range l.zones {
+			z := &l.zones[i]
+			if fqdn(z.Name) == fqdn(best.Name) && strings.EqualFold(z.View, best.InView) && z.Type != "in-view" {
+				served = z
+			}
+		}
+		if served == nil {
+			return nil, view, fmt.Sprintf("zone %s%s serves view %s's zone, which the token can't see", short(best.Name), where, best.InView)
+		}
+		best = served
+	}
+	if best.Disabled {
+		return nil, view, fmt.Sprintf("zone %s%s is disabled in Jarl", short(best.Name), where)
+	}
+	if best.Type != "primary" {
+		return nil, view, fmt.Sprintf("zone %s%s is a %s zone: Jarl doesn't hold its records", short(best.Name), where, best.Type)
+	}
+	return best, view, ""
+}
+
+func (l *lookup) zoneRecords(id int64) ([]jarl.Record, error) {
+	if err, ok := l.errs[id]; ok {
+		return nil, err
+	}
+	if rs, ok := l.records[id]; ok {
+		return rs, nil
+	}
+	rs, err := l.src.Records(l.ctx, id)
+	if err != nil {
+		l.errs[id] = err
+		return nil, err
+	}
+	l.records[id] = rs
+	return rs, nil
+}
+
+// resolve looks a name up as named would answer it in the view: its A
+// and AAAA records, or those of the names its CNAMEs lead to.
+func (l *lookup) resolve(n model.JarlName) *Lookup {
+	out := &Lookup{Name: n.Name, View: n.View}
+	name, view := fqdn(n.Name), n.View
+	seen := map[string]bool{name: true}
+	for hop := 0; ; hop++ {
+		z, v, problem := l.zoneFor(name, view)
+		if hop == 0 {
+			out.Found = v
+		}
+		if problem != "" {
+			if hop > 0 {
+				problem = fmt.Sprintf("its CNAME leads to %s, which Housecarl can't follow: %s (only names Jarl holds are followed)", short(name), problem)
+			}
+			out.Problem = problem
+			return out
+		}
+		view = v
+		recs, err := l.zoneRecords(z.ID)
+		if err != nil {
+			out.Error = err.Error()
+			return out
+		}
+		apex := fqdn(z.Name)
+		var addrs []string
+		cname := ""
+		for _, rec := range recs {
+			owner := fqdn(rec.Name)
+			switch {
+			case rec.Type == "NS" && owner != apex && under(name, owner):
+				out.Problem = fmt.Sprintf("%s is below a delegation (NS records at %s): Jarl doesn't hold its records", short(name), short(owner))
+				return out
+			case owner != name:
+			case rec.Type == "A" || rec.Type == "AAAA":
+				if a, err := netip.ParseAddr(strings.TrimSpace(rec.Data)); err == nil {
+					addrs = append(addrs, a.Unmap().String())
+				}
+			case rec.Type == "CNAME":
+				cname = target(rec.Data, apex)
+			}
+		}
+		if cname != "" {
+			if seen[cname] || len(out.Chain) >= maxChain {
+				out.Problem = fmt.Sprintf("its CNAMEs go round in a loop or are longer than %d (%s)", maxChain, strings.Join(append(out.Chain, short(cname)), " → "))
+				return out
+			}
+			seen[cname] = true
+			out.Chain = append(out.Chain, short(cname))
+			name = cname
+			continue
+		}
+		if len(addrs) == 0 {
+			if hop > 0 {
+				out.Problem = fmt.Sprintf("its CNAME leads to %s, which has no A or AAAA record in Jarl", short(name))
+			} else {
+				out.Problem = fmt.Sprintf("%s has no A, AAAA or CNAME record in Jarl (wildcards aren't followed)", short(name))
+			}
+			return out
+		}
+		sortAddrs(addrs)
+		out.Addresses = dedup(addrs)
+		return out
+	}
+}
+
+// target is a CNAME's target as an FQDN (a relative one is under the
+// zone, as in a zone file).
+func target(data, apex string) string {
+	t := strings.ToLower(strings.TrimSpace(data))
+	if strings.HasSuffix(t, ".") {
+		return t
+	}
+	if t == "@" {
+		return apex
+	}
+	if apex == "." {
+		return t + "."
+	}
+	return t + "." + apex
+}
+
+func dedup(in []string) []string {
+	var out []string
+	for i, a := range in {
+		if i == 0 || a != in[i-1] {
+			out = append(out, a)
+		}
+	}
+	return out
+}
+
+// ---- status
+
+// Status is what a Jarl set holds and why.
+func (r *Resolver) Status(st *model.State, set *model.AddressSet) api.JarlSet {
+	out := api.JarlSet{Set: set.Name, Entries: []string{}, Names: []api.JarlName{}, Within: []string{}}
+	if set.Jarl == nil {
+		return out
+	}
+	out.Within = append(out.Within, set.Jarl.Within...)
+	out.Entries = r.Entries(st)[set.Name]
+	nets := r.nets(st)
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.init()
+	out.Configured = r.Source != nil
+	if !r.read.IsZero() {
+		t := r.read
+		out.Read = &t
+	}
+	out.Error = r.err
+	for _, n := range set.Jarl.Names {
+		jn := api.JarlName{Name: n.Name, View: n.View, Addresses: []api.JarlAddress{}}
+		if lu := r.data.Lookups[n.String()]; lu != nil {
+			jn.Found, jn.Chain, jn.Problem, jn.Error = lu.Found, lu.Chain, lu.Problem, lu.Error
+			if !lu.Checked.IsZero() {
+				t := lu.Checked
+				jn.Checked = &t
+			}
+			for _, a := range lu.Addresses {
+				why := allowed(a, set.Jarl.Within, nets)
+				jn.Addresses = append(jn.Addresses, api.JarlAddress{Address: a, Used: why == "", Why: why})
+			}
+		}
+		out.Names = append(out.Names, jn)
+	}
+	return out
+}
+
+// Problems are the warnings about the Jarl sets for the status page.
+func (r *Resolver) Problems(st *model.State) []validate.Problem {
+	var out []validate.Problem
+	var sets []*model.AddressSet
+	for _, s := range st.Sets {
+		if s.Jarl != nil {
+			sets = append(sets, s)
+		}
+	}
+	if len(sets) == 0 {
+		return nil
+	}
+	r.mu.Lock()
+	configured, readErr := r.Source != nil, r.err
+	r.mu.Unlock()
+	if !configured {
+		out = append(out, validate.Problem{Severity: validate.Warning, Code: "jarl_not_configured", Object: "jarl",
+			Message: "sets take their addresses from Jarl, but housecarl.yaml names no Jarl server (jarl.server, docs/jarl.md): they keep the addresses they last had, none if Jarl was never read"})
+	} else if readErr != "" {
+		out = append(out, validate.Problem{Severity: validate.Warning, Code: "jarl_unreachable", Object: "jarl",
+			Message: "reading Jarl failed: " + readErr + "; the Jarl sets keep the addresses they had"})
+	}
+	for _, s := range sets {
+		obj := "set " + s.Name
+		for _, n := range r.Status(st, s).Names {
+			switch {
+			case n.Problem != "":
+				out = append(out, validate.Problem{Severity: validate.Warning, Code: "jarl_name", Object: obj,
+					Message: n.Name + viewSuffix(n.View) + ": " + n.Problem + "; it adds no addresses"})
+			case n.Error != "" && readErr == "":
+				out = append(out, validate.Problem{Severity: validate.Warning, Code: "jarl_unreachable", Object: obj,
+					Message: n.Name + viewSuffix(n.View) + ": reading it from Jarl failed: " + n.Error + "; it keeps the addresses it had"})
+			}
+			for _, a := range n.Addresses {
+				if !a.Used {
+					out = append(out, validate.Problem{Severity: validate.Warning, Code: "jarl_outside", Object: obj,
+						Message: fmt.Sprintf("%s%s has address %s, which is left out: %s", n.Name, viewSuffix(n.View), a.Address, a.Why)})
+				}
+			}
+		}
+	}
+	return out
+}
+
+func viewSuffix(v string) string {
+	if v == "" {
+		return ""
+	}
+	return "@" + v
+}

internal/jarlsets/jarlsets_test.go

@@ -0,0 +1,317 @@
+package jarlsets
+
+import (
+	"context"
+	"errors"
+	"io"
+	"log/slog"
+	"net/netip"
+	"reflect"
+	"strings"
+	"testing"
+
+	"housecarl/internal/jarl"
+	"housecarl/internal/model"
+)
+
+// fakeJarl is a Jarl with a few zones.
+type fakeJarl struct {
+	zones   []jarl.ZoneInfo
+	records map[int64][]jarl.Record
+	down    bool           // AllZones fails
+	broken  map[int64]bool // Records fails
+	calls   int
+}
+
+func (f *fakeJarl) AllZones(ctx context.Context) ([]jarl.ZoneInfo, error) {
+	if f.down {
+		return nil, errors.New("can't reach Jarl")
+	}
+	return f.zones, nil
+}
+
+func (f *fakeJarl) Records(ctx context.Context, id int64) ([]jarl.Record, error) {
+	f.calls++
+	if f.broken[id] {
+		return nil, errors.New("Jarl answered 500")
+	}
+	return f.records[id], nil
+}
+
+func rec(name, typ, data string) jarl.Record { return jarl.Record{Name: name, Type: typ, Data: data} }
+
+// newFake: example.com in views internal (1) and external (2), linked
+// sub-zone wg.example.com in internal (3), other.org only in internal (4),
+// a secondary (5), a disabled zone (6), an in-view zone in vps (7).
+func newFake() *fakeJarl {
+	return &fakeJarl{
+		zones: []jarl.ZoneInfo{
+			{ID: 1, Name: "example.com.", View: "internal", Type: "primary"},
+			{ID: 2, Name: "example.com.", View: "external", Type: "primary"},
+			{ID: 3, Name: "wg.example.com.", View: "internal", Type: "primary"},
+			{ID: 4, Name: "other.org.", View: "internal", Type: "primary"},
+			{ID: 5, Name: "sec.net.", View: "internal", Type: "secondary"},
+			{ID: 6, Name: "off.net.", View: "internal", Type: "primary", Disabled: true},
+			{ID: 7, Name: "other.org.", View: "vps", Type: "in-view", InView: "internal"},
+			{ID: 8, Name: ".", View: "internal", Type: "hint"},
+		},
+		records: map[int64][]jarl.Record{
+			1: {
+				rec("example.com.", "NS", "ns1.example.com."),
+				rec("nas.example.com.", "A", "10.10.0.20"),
+				rec("nas.example.com.", "A", "10.10.0.21"),
+				rec("nas.example.com.", "AAAA", "2001:db8:10::20"),
+				rec("files.example.com.", "CNAME", "nas.example.com."),
+				rec("vpn.example.com.", "CNAME", "peer1.wg.example.com."),
+				rec("ext.example.com.", "CNAME", "host.duckdns.org."),
+				rec("loop1.example.com.", "CNAME", "loop2.example.com."),
+				rec("loop2.example.com.", "CNAME", "loop1"),
+				rec("rel.example.com.", "CNAME", "nas"),
+				rec("mail.example.com.", "MX", "10 nas.example.com."),
+				rec("lab.example.com.", "NS", "ns.lab.example.com."),
+				rec("www.example.com.", "A", "10.10.0.30"),
+				rec("bad.example.com.", "A", "127.0.0.1"),
+				rec("far.example.com.", "A", "192.0.2.9"),
+				rec("dead.example.com.", "CNAME", "nothing.example.com."),
+				rec("toother.example.com.", "CNAME", "srv.other.org."),
+			},
+			2: {
+				rec("www.example.com.", "A", "203.0.113.30"),
+			},
+			3: {
+				rec("peer1.wg.example.com.", "A", "10.50.50.2"),
+			},
+			4: {
+				rec("srv.other.org.", "A", "10.10.0.40"),
+			},
+		},
+		broken: map[int64]bool{},
+	}
+}
+
+func resolveOne(t *testing.T, f *fakeJarl, s string) *Lookup {
+	t.Helper()
+	l := &lookup{ctx: context.Background(), src: f, zones: f.zones, records: map[int64][]jarl.Record{}, errs: map[int64]error{}}
+	return l.resolve(model.ParseJarlName(s))
+}
+
+func TestResolve(t *testing.T) {
+	f := newFake()
+	cases := []struct {
+		name    string
+		addrs   []string
+		chain   []string
+		problem string // part of it
+		found   string
+	}{
+		{name: "nas.example.com@internal", addrs: []string{"10.10.0.20", "10.10.0.21", "2001:db8:10::20"}, found: "internal"},
+		{name: "NAS.Example.com.@internal", addrs: []string{"10.10.0.20", "10.10.0.21", "2001:db8:10::20"}, found: "internal"},
+		{name: "files.example.com@internal", addrs: []string{"10.10.0.20", "10.10.0.21", "2001:db8:10::20"}, chain: []string{"nas.example.com"}},
+		{name: "rel.example.com@internal", addrs: []string{"10.10.0.20", "10.10.0.21", "2001:db8:10::20"}, chain: []string{"nas.example.com"}},
+		// Into the sub-zone, and into another zone of the same view.
+		{name: "vpn.example.com@internal", addrs: []string{"10.50.50.2"}, chain: []string{"peer1.wg.example.com"}},
+		{name: "toother.example.com@internal", addrs: []string{"10.10.0.40"}, chain: []string{"srv.other.org"}},
+		// Only internal has wg.example.com, but external's example.com
+		// answers for the name too (that it doesn't exist): the view must be
+		// named.
+		{name: "peer1.wg.example.com", problem: "views external, internal"},
+		{name: "srv.other.org", problem: "views internal, vps"},
+		// Views give different answers.
+		{name: "www.example.com@internal", addrs: []string{"10.10.0.30"}},
+		{name: "www.example.com@external", addrs: []string{"203.0.113.30"}},
+		{name: "www.example.com", problem: "views external, internal: name the view"},
+		{name: "www.example.com@vps", problem: "no zone in view vps holds www.example.com"},
+		// An in-view zone serves the other view's records.
+		{name: "srv.other.org@vps", addrs: []string{"10.10.0.40"}},
+		{name: "ext.example.com@internal", chain: []string{"host.duckdns.org"}, problem: "its CNAME leads to host.duckdns.org, which Housecarl can't follow"},
+		{name: "loop1.example.com@internal", problem: "loop"},
+		{name: "dead.example.com@internal", chain: []string{"nothing.example.com"}, problem: "nothing.example.com, which has no A or AAAA record"},
+		{name: "mail.example.com@internal", problem: "has no A, AAAA or CNAME record"},
+		{name: "missing.example.com@internal", problem: "has no A, AAAA or CNAME record"},
+		{name: "host.lab.example.com@internal", problem: "below a delegation (NS records at lab.example.com)"},
+		{name: "a.sec.net", problem: "is a secondary zone"},
+		{name: "a.off.net", problem: "is disabled"},
+		{name: "nowhere.test", problem: "no zone in Jarl holds nowhere.test"},
+	}
+	for _, c := range cases {
+		lu := resolveOne(t, f, c.name)
+		if lu.Error != "" {
+			t.Errorf("%s: error %s", c.name, lu.Error)
+		}
+		if !reflect.DeepEqual(lu.Addresses, c.addrs) {
+			t.Errorf("%s: addresses %v, want %v (problem %q)", c.name, lu.Addresses, c.addrs, lu.Problem)
+		}
+		if c.chain != nil && !reflect.DeepEqual(lu.Chain, c.chain) {
+			t.Errorf("%s: chain %v, want %v", c.name, lu.Chain, c.chain)
+		}
+		if c.problem == "" && lu.Problem != "" || !strings.Contains(lu.Problem, c.problem) {
+			t.Errorf("%s: problem %q, want %q", c.name, lu.Problem, c.problem)
+		}
+		if c.found != "" && lu.Found != c.found {
+			t.Errorf("%s: found in %q, want %q", c.name, lu.Found, c.found)
+		}
+	}
+}
+
+func TestResolveNoViews(t *testing.T) {
+	f := &fakeJarl{zones: []jarl.ZoneInfo{{ID: 1, Name: "lan.", Type: "primary"}},
+		records: map[int64][]jarl.Record{1: {rec("nas.lan.", "A", "192.168.1.5")}}}
+	if lu := resolveOne(t, f, "nas.lan"); !reflect.DeepEqual(lu.Addresses, []string{"192.168.1.5"}) || lu.Problem != "" {
+		t.Errorf("%+v", lu)
+	}
+}
+
+// harness is a resolver over the fake Jarl, with lan = 10.10.0.0/24 and
+// wg = 10.50.50.0/24 connected.
+type harness struct {
+	r       *Resolver
+	f       *fakeJarl
+	st      *model.State
+	conn    map[netip.Prefix]string
+	applies int
+	audits  []string
+	saved   string
+}
+
+func newHarness(sets ...*model.AddressSet) *harness {
+	h := &harness{f: newFake(), conn: map[netip.Prefix]string{
+		netip.MustParsePrefix("10.10.0.0/24"):  "lan",
+		netip.MustParsePrefix("10.50.50.0/24"): "wg",
+	}}
+	h.st = &model.State{Zones: []*model.Zone{{Name: "lan"}, {Name: "wg"}, {Name: "wan"}}, Sets: sets}
+	h.r = &Resolver{Source: h.f, State: func() *model.State { return h.st }, Log: slog.New(slog.NewTextHandler(io.Discard, nil)),
+		Connected: func(*model.State) map[netip.Prefix]string { return h.conn },
+		Apply: func(ctx context.Context) error {
+			h.applies++
+			h.r.Applied(h.r.Entries(h.st))
+			return nil
+		},
+		Audit: func(ctx context.Context, set, detail string) { h.audits = append(h.audits, set+": "+detail) },
+		Load:  func(ctx context.Context) (string, error) { return h.saved, nil },
+		Save:  func(ctx context.Context, v string) error { h.saved = v; return nil }}
+	return h
+}
+
+func jset(name string, within []string, names ...string) *model.AddressSet {
+	j := &model.JarlSource{Within: within}
+	for _, n := range names {
+		j.Names = append(j.Names, model.ParseJarlName(n))
+	}
+	return &model.AddressSet{Name: name, Jarl: j}
+}
+
+func TestWithin(t *testing.T) {
+	h := newHarness(
+		jset("nas", []string{"lan"}, "nas.example.com@internal", "vpn.example.com@internal", "bad.example.com@internal", "far.example.com@internal"),
+		jset("wide", []string{"lan", "wg", "192.0.2.0/24", "2001:db8:10::/64"}, "nas.example.com@internal", "vpn.example.com@internal", "far.example.com@internal"),
+		jset("none", []string{"lan"}, "missing.example.com@internal"),
+	)
+	h.r.Refresh(context.Background())
+	got := h.r.Entries(h.st)
+	want := map[string][]string{
+		"nas":  {"10.10.0.20", "10.10.0.21"},
+		"wide": {"10.10.0.20", "10.10.0.21", "10.50.50.2", "192.0.2.9", "2001:db8:10::20"},
+		"none": {},
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("entries %v, want %v", got, want)
+	}
+	st := h.r.Status(h.st, h.st.Sets[0])
+	why := map[string]string{}
+	for _, n := range st.Names {
+		for _, a := range n.Addresses {
+			why[a.Address] = a.Why
+		}
+	}
+	if why["10.10.0.20"] != "" || !strings.Contains(why["10.50.50.2"], "not within lan") || !strings.Contains(why["127.0.0.1"], "loopback") || why["2001:db8:10::20"] == "" {
+		t.Errorf("why: %v", why)
+	}
+	codes := map[string]int{}
+	for _, p := range h.r.Problems(h.st) {
+		codes[p.Code]++
+	}
+	// nas: 3 left out (v6, wg, loopback, far = 4); wide: none; none: a name problem.
+	if codes["jarl_outside"] != 4 || codes["jarl_name"] != 1 || codes["jarl_unreachable"] != 0 {
+		t.Errorf("problems %v: %+v", codes, h.r.Problems(h.st))
+	}
+	// The lan interface loses its address: its networks as last seen count.
+	h.conn = map[netip.Prefix]string{}
+	if got := h.r.Entries(h.st)["nas"]; !reflect.DeepEqual(got, []string{"10.10.0.20", "10.10.0.21"}) {
+		t.Errorf("without lan's address: %v", got)
+	}
+}
+
+func TestKeepsWhatItHad(t *testing.T) {
+	h := newHarness(jset("nas", []string{"lan", "wg"}, "nas.example.com@internal", "peer1.wg.example.com@internal"))
+	ctx := context.Background()
+	h.r.Refresh(ctx)
+	if h.applies != 1 || len(h.audits) != 1 || !strings.Contains(h.audits[0], "added 10.10.0.20, 10.10.0.21, 10.50.50.2") {
+		t.Fatalf("first read: %d applies, audits %v", h.applies, h.audits)
+	}
+	// Nothing changed: no apply.
+	h.r.Refresh(ctx)
+	if h.applies != 1 {
+		t.Errorf("unchanged: %d applies", h.applies)
+	}
+	// Jarl down: the addresses stay, a warning says so.
+	h.f.down = true
+	h.r.Refresh(ctx)
+	if got := h.r.Entries(h.st)["nas"]; len(got) != 3 || h.applies != 1 {
+		t.Errorf("Jarl down: %v, %d applies", got, h.applies)
+	}
+	if ps := h.r.Problems(h.st); len(ps) != 2 || ps[0].Code != "jarl_unreachable" || ps[1].Code != "jarl_outside" {
+		t.Errorf("Jarl down: %+v", ps)
+	}
+	// One zone's records fail: only its name keeps the old addresses.
+	h.f.down = false
+	h.f.broken[3] = true
+	h.f.records[1][1] = rec("nas.example.com.", "A", "10.10.0.22")
+	h.r.Refresh(ctx)
+	if got := h.r.Entries(h.st)["nas"]; !reflect.DeepEqual(got, []string{"10.10.0.21", "10.10.0.22", "10.50.50.2"}) {
+		t.Errorf("one zone down: %v", got)
+	}
+	if h.applies != 2 || !strings.Contains(h.audits[1], "added 10.10.0.22; removed 10.10.0.20") {
+		t.Errorf("audits %v", h.audits)
+	}
+	// After a restart, before Jarl is read: what was saved.
+	r2 := &Resolver{Load: h.r.Load, State: h.r.State, Connected: h.r.Connected}
+	r2.Restore(ctx)
+	if got := r2.Entries(h.st)["nas"]; !reflect.DeepEqual(got, []string{"10.10.0.21", "10.10.0.22", "10.50.50.2"}) {
+		t.Errorf("restored: %v", got)
+	}
+	// Jarl answers that the name is gone: its addresses go.
+	h.f.broken[3] = false
+	h.f.records[3] = nil
+	h.r.Refresh(ctx)
+	if got := h.r.Entries(h.st)["nas"]; !reflect.DeepEqual(got, []string{"10.10.0.21", "10.10.0.22"}) {
+		t.Errorf("deleted record: %v", got)
+	}
+	// A name taken out of the set is forgotten.
+	h.st.Sets[0].Jarl.Names = h.st.Sets[0].Jarl.Names[:1]
+	h.r.Refresh(ctx)
+	if len(h.r.data.Lookups) != 1 {
+		t.Errorf("lookups %v", h.r.data.Lookups)
+	}
+}
+
+func TestNotConfigured(t *testing.T) {
+	h := newHarness(jset("nas", []string{"lan"}, "nas.example.com@internal"))
+	h.r.Source = nil
+	h.r.Refresh(context.Background())
+	if ps := h.r.Problems(h.st); len(ps) != 1 || ps[0].Code != "jarl_not_configured" {
+		t.Errorf("%+v", ps)
+	}
+	if got := h.r.Entries(h.st); !reflect.DeepEqual(got, map[string][]string{"nas": {}}) {
+		t.Errorf("%v", got)
+	}
+}
+
+// TestNoSetsNoApply: without Jarl sets nothing is applied, not even at the
+// first read (an empty configuration must never be applied).
+func TestNoSetsNoApply(t *testing.T) {
+	h := newHarness()
+	h.r.Refresh(context.Background())
+	if h.applies != 0 {
+		t.Errorf("%d applies", h.applies)
+	}
+}

internal/matrix/matrix.go

@@ -9,6 +9,7 @@ package matrix
 import (
 	"fmt"
 	"net/netip"
+	"regexp"
 	"strings"
 
 	"housecarl/internal/api"
@@ -63,6 +64,50 @@ func Cell(st *model.State, o Options, from, to string) (api.MatrixCell, bool) {
 }
 
 func cell(st *model.State, o Options, chain, from, to string) api.MatrixCell {
+	c := walkCell(st, o, chain, from, to)
+	sum(&c)
+	if from == to && chain == model.ChainForward {
+		c.SameZone, c.Note = true, sameZoneNote(st.Zone(from))
+	}
+	return c
+}
+
+// sum fills in the overview: the summary, the exceptions counted by
+// verdict, and what the allowing ones let through.
+func sum(c *api.MatrixCell) {
+	c.Open = []string{}
+	seen := map[string]bool{}
+	for _, e := range c.Exceptions {
+		switch e.Verdict {
+		case "allowed":
+			c.Allowed++
+			if !seen[e.Short] {
+				seen[e.Short] = true
+				c.Open = append(c.Open, e.Short)
+			}
+		case "blocked":
+			c.Blocked++
+		}
+	}
+	c.Summary = c.Verdict
+	if c.Verdict == "blocked" && c.Allowed > 0 || c.Verdict == "allowed" && c.Blocked > 0 {
+		c.Summary = "partly"
+	}
+}
+
+// sameZoneNote says what of a zone's traffic to itself the firewall sees:
+// only what it routes between the zone's interfaces.
+func sameZoneNote(z *model.Zone) string {
+	if z == nil {
+		return ""
+	}
+	if len(z.Interfaces) == 1 && !strings.HasSuffix(z.Interfaces[0], "*") {
+		return fmt.Sprintf("traffic within %s stays on its own network: it passes the firewall only if routed back out of %s", z.Name, z.Interfaces[0])
+	}
+	return fmt.Sprintf("only traffic routed between %s's interfaces (%s) passes the firewall; within one of them it stays on its own network", z.Name, strings.Join(z.Interfaces, ", "))
+}
+
+func walkCell(st *model.State, o Options, chain, from, to string) api.MatrixCell {
 	c := api.MatrixCell{From: from, To: to, Chain: chain, Exceptions: []api.MatrixException{}}
 	b := st.Settings.Builtins
 	fromZone := st.Zone(from)
@@ -71,7 +116,7 @@ func cell(st *model.State, o Options, chain, from, to string) api.MatrixCell {
 	if chain != model.ChainOutput {
 		if b.Antispoof && external {
 			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: model.ChainEarly, Label: "built-in: antispoof", Verdict: "blocked",
-				What: "sources that can't come from outside (private ranges, your own prefixes)"})
+				What: "sources that can't come from outside (private ranges, your own prefixes)", Short: "spoofed sources", Marks: []string{"b-antispoof", "b-antispoof6"}})
 		}
 		if decided := walk(st, o, &c, model.ChainEarly, from, ""); decided {
 			return c
@@ -81,22 +126,26 @@ func cell(st *model.State, o Options, chain, from, to string) api.MatrixCell {
 	switch chain {
 	case model.ChainInput:
 		if b.ICMPv6 {
-			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: icmpv6", Verdict: "allowed", What: "ICMPv6 errors, echo, neighbour discovery, MLD"})
+			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: icmpv6", Verdict: "allowed", What: "ICMPv6 errors, echo, neighbour discovery, MLD",
+				Short: "ICMPv6", Marks: []string{"b-icmpv6", "b-icmpv6-nd", "b-icmpv6-mld"}})
 		}
 		if b.PingInternal && !external {
-			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: ping", Verdict: "allowed", What: "ping (ICMP echo)"})
+			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: ping", Verdict: "allowed", What: "ping (ICMP echo)", Short: "ping", Marks: []string{"b-ping"}})
 		}
 		if b.DHCPv6Client && external {
-			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: dhcpv6-client", Verdict: "allowed", What: "DHCPv6 replies to the firewall"})
+			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: dhcpv6-client", Verdict: "allowed", What: "DHCPv6 replies to the firewall",
+				Short: "DHCPv6", Marks: []string{"b-dhcpv6-client"}})
 		}
 	case model.ChainForward:
-		if n := forwards(st); n > 0 && external && !st.Zone(to).External {
+		if marks := forwards(st); len(marks) > 0 && external && !st.Zone(to).External {
+			n := fmt.Sprintf("%d port forward%s", len(marks), map[bool]string{true: "", false: "s"}[len(marks) == 1])
 			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "port forwards", Verdict: "allowed",
-				What: fmt.Sprintf("%d port forward%s to inside hosts", n, map[bool]string{true: "", false: "s"}[n == 1])})
+				What: n + " to inside hosts", Short: n, Marks: marks})
 		}
 	case model.ChainOutput:
 		if st.Settings.OutputPolicy == model.PolicyDrop && b.ICMPv6 {
-			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: icmpv6", Verdict: "allowed", What: "ICMPv6 errors, echo, neighbour discovery, MLD"})
+			c.Exceptions = append(c.Exceptions, api.MatrixException{Chain: chain, Label: "built-in: icmpv6", Verdict: "allowed", What: "ICMPv6 errors, echo, neighbour discovery, MLD",
+				Short: "ICMPv6", Marks: []string{"b-icmpv6"}})
 		}
 	}
 	if walk(st, o, &c, chain, from, to) {
@@ -104,17 +153,22 @@ func cell(st *model.State, o Options, chain, from, to string) api.MatrixCell {
 	}
 	policy := map[string]string{model.ChainInput: st.Settings.InputPolicy, model.ChainForward: st.Settings.ForwardPolicy, model.ChainOutput: st.Settings.OutputPolicy}[chain]
 	c.Verdict, c.DecidedBy = verdictOf(policy), chain+" policy"
+	if policy == model.PolicyDrop {
+		c.Marks = []string{"p-" + chain} // only a drop policy is counted
+	}
 	return c
 }
 
-func forwards(st *model.State) int {
-	n := 0
+// forwards returns the counters' marks of the port forwards that send
+// connections inside.
+func forwards(st *model.State) []string {
+	var marks []string
 	for _, f := range st.Forwards {
 		if !f.Disabled && f.To != "" {
-			n++
+			marks = append(marks, fmt.Sprintf("f%d", f.ID))
 		}
 	}
-	return n
+	return marks
 }
 
 // walk goes through a chain's rules for the pair, as nftables checks
@@ -130,8 +184,22 @@ func walk(st *model.State, o Options, c *api.MatrixCell, chain, from, to string)
 		}
 	}
 	for _, r := range rules {
+		mark := []string{fmt.Sprintf("r%d", r.ID)}
 		if r.Raw != "" {
-			c.Exceptions = append(c.Exceptions, api.MatrixException{RuleID: r.ID, Chain: chain, Label: "rule " + r.Label(), Verdict: "unknown", What: "a raw rule: " + r.Raw})
+			rr := readRaw(r.Raw)
+			switch {
+			case !rr.ok:
+				c.Exceptions = append(c.Exceptions, api.MatrixException{RuleID: r.ID, Chain: chain, Label: "rule " + r.Label(), Verdict: "unknown", What: "a raw rule: " + r.Raw,
+					Short: "a raw rule", Marks: mark})
+			case !rr.forNew || chain == model.ChainEarly && rr.verdict == "allowed":
+				// Not for new connections; an early accept decides nothing.
+			case rr.match == "":
+				c.Verdict, c.DecidedBy, c.RuleID, c.Marks = rr.verdict, "rule "+r.Label(), r.ID, mark
+				return true
+			default:
+				c.Exceptions = append(c.Exceptions, api.MatrixException{RuleID: r.ID, Chain: chain, Label: "rule " + r.Label(), Verdict: rr.verdict, What: "raw: " + rr.match,
+					Short: rr.short, Marks: mark})
+			}
 			continue
 		}
 		if !zones(r, from, to) || !forNew(r) {
@@ -151,10 +219,11 @@ func walk(st *model.State, o Options, c *api.MatrixCell, chain, from, to string)
 			if what == "" {
 				what = "everything"
 			}
-			c.Exceptions = append(c.Exceptions, api.MatrixException{RuleID: r.ID, Chain: chain, Label: "rule " + r.Label(), Verdict: v, What: what})
+			c.Exceptions = append(c.Exceptions, api.MatrixException{RuleID: r.ID, Chain: chain, Label: "rule " + r.Label(), Verdict: v, What: what,
+				Short: short(r, what), Marks: mark})
 			continue
 		}
-		c.Verdict, c.DecidedBy, c.RuleID = v, "rule "+r.Label(), r.ID
+		c.Verdict, c.DecidedBy, c.RuleID, c.Marks = v, "rule "+r.Label(), r.ID, mark
 		return true
 	}
 	return false
@@ -172,7 +241,7 @@ func verdictOf(action string) string {
 
 // elsewhere reports whether every address of refs (addresses, sets) lies
 // in networks connected to zones other than zone: then traffic of zone
-// can't have them. An empty list, a dynamic set, or an address the
+// can't have them. An empty list, a dynamic or Jarl set, or an address the
 // firewall isn't directly connected to (a routed network) might.
 func elsewhere(st *model.State, o Options, refs []string, zone string) bool {
 	if len(refs) == 0 || len(o.Connected) == 0 || zone == Firewall {
@@ -181,7 +250,7 @@ func elsewhere(st *model.State, o Options, refs []string, zone string) bool {
 	var entries []string
 	for _, r := range refs {
 		if s := st.Set(r); s != nil {
-			if s.Dynamic {
+			if s.Runtime() {
 				return false
 			}
 			entries = append(entries, s.Entries...)
@@ -265,6 +334,160 @@ func forNew(r *model.Rule) bool {
 	return false
 }
 
+// raw is what the matrix can read of a raw rule.
+type raw struct {
+	ok      bool   // read: it applies to every pair of its chain
+	forNew  bool   // it can match a new connection
+	verdict string // allowed or blocked
+	match   string // what it matches ("" for everything)
+	short   string
+}
+
+// rawStops are words that make a raw rule's reach or effect unclear to
+// the matrix: interfaces (which zones?), jumps, NAT, changes, verdict maps.
+var rawStops = map[string]bool{
+	"iifname": true, "oifname": true, "iif": true, "oif": true, "iiftype": true, "oiftype": true,
+	"jump": true, "goto": true, "return": true, "vmap": true, "queue": true, "continue": true,
+	"dnat": true, "snat": true, "masquerade": true, "redirect": true, "tproxy": true,
+	"set": true, "notrack": true, "dup": true, "fwd": true, "synproxy": true, "flow": true,
+}
+
+// readRaw reads a raw rule that is a match and then accept, drop or
+// reject: the verdict is the last word (but a reject's "with …"); counter
+// and log only count and log.
+func readRaw(text string) raw {
+	toks := fields(text)
+	for i, t := range toks {
+		if t == "comment" {
+			toks = toks[:i]
+			break
+		}
+	}
+	verdict := -1
+	for i, t := range toks {
+		if strings.HasPrefix(t, `"`) {
+			continue
+		}
+		w := strings.Trim(t, ",{}")
+		if rawStops[w] {
+			return raw{}
+		}
+		if w == "accept" || w == "drop" || w == "reject" {
+			verdict = i
+		}
+	}
+	if verdict < 0 || verdict != len(toks)-1 && !(toks[verdict] == "reject" && toks[verdict+1] == "with") {
+		return raw{}
+	}
+	rr := raw{ok: true, forNew: true, verdict: verdictOf(toks[verdict])}
+	var match []string
+	for i := 0; i < verdict; i++ {
+		switch toks[i] {
+		case "counter":
+			continue
+		case "log":
+			// Its options run up to the next match.
+			for i+1 < verdict && map[string]bool{"prefix": true, "level": true, "group": true, "flags": true}[toks[i+1]] {
+				i += 2
+			}
+			continue
+		}
+		match = append(match, toks[i])
+	}
+	rr.match = strings.Join(match, " ")
+	// ct state without new: not for new connections. The states are one
+	// word ("established,related") or a set ("{ established, related }").
+	for i := 0; i+2 < len(match); i++ {
+		if match[i] != "ct" || match[i+1] != "state" {
+			continue
+		}
+		list := match[i+2]
+		if list == "{" || strings.HasPrefix(list, "{") {
+			var b []string
+			for j := i + 2; j < len(match); j++ {
+				b = append(b, match[j])
+				if strings.HasSuffix(match[j], "}") {
+					break
+				}
+			}
+			list = strings.Join(b, " ")
+		}
+		rr.forNew = false
+		for _, st := range strings.FieldsFunc(list, func(c rune) bool { return c == ',' || c == ' ' || c == '{' || c == '}' }) {
+			rr.forNew = rr.forNew || st == "new"
+		}
+	}
+	rr.short = rr.match
+	if m := icmpRe.FindStringSubmatch(rr.match); m != nil {
+		rr.short = m[1]
+	}
+	if len(rr.short) > 40 {
+		rr.short = rr.short[:39] + "…"
+	}
+	return rr
+}
+
+// fields splits a rule into words, a quoted string being one.
+func fields(s string) []string {
+	var out []string
+	var cur strings.Builder
+	quoted := false
+	for _, c := range s {
+		switch {
+		case c == '"':
+			quoted = !quoted
+			cur.WriteRune(c)
+		case !quoted && (c == ' ' || c == '\t'):
+			if cur.Len() > 0 {
+				out = append(out, cur.String())
+				cur.Reset()
+			}
+		default:
+			cur.WriteRune(c)
+		}
+	}
+	if cur.Len() > 0 {
+		out = append(out, cur.String())
+	}
+	return out
+}
+
+// icmpRe finds an ICMP type match in a raw rule: shown as just icmp or
+// icmpv6.
+var icmpRe = regexp.MustCompile(`\b(icmpv6|icmp) type\b`)
+
+// short sums up an exception for the overview: its services (ICMP types
+// as just icmp or icmpv6), with the addresses it is limited to, which
+// matter as much ("tcp/22 from trusted"); times and rates are left to
+// the details.
+func short(r *model.Rule, what string) string {
+	var parts []string
+	if len(r.Services) > 0 {
+		var svcs []string
+		seen := map[string]bool{}
+		for _, s := range r.Services {
+			if p, _, ok := strings.Cut(s, "/"); ok && (p == "icmp" || p == "icmpv6") {
+				s = p
+			}
+			if !seen[s] {
+				seen[s] = true
+				svcs = append(svcs, s)
+			}
+		}
+		parts = append(parts, strings.Join(svcs, ", "))
+	}
+	for _, c := range strings.Split(what, " · ") {
+		if strings.HasPrefix(c, "from ") || strings.HasPrefix(c, "to ") {
+			parts = append(parts, c)
+		}
+	}
+	if len(parts) == 0 {
+		first, _, _ := strings.Cut(what, " · ")
+		return first
+	}
+	return strings.Join(parts, " ")
+}
+
 // conditions says what limits a rule to part of a pair's traffic ("" for
 // none: it decides the pair).
 func conditions(st *model.State, r *model.Rule) string {

internal/matrix/matrix_test.go

@@ -110,3 +110,90 @@ func TestConnected(t *testing.T) {
 		t.Errorf("guest → lan: %v", ids(guestLan)) // not "to a guest": it is in guest, not lan
 	}
 }
+
+// TestSummary: each pair at a glance, what its exceptions let through,
+// and the counters behind each line.
+func TestSummary(t *testing.T) {
+	st := state()
+	st.Settings.InputPolicy = model.PolicyDrop
+	m := Build(st)
+	for _, c := range []struct {
+		from, to, summary string
+		allowed, blocked  int
+		open              string
+	}{
+		{"lan", "wan", "allowed", 0, 0, ""},
+		{"guest", "wan", "partly", 1, 0, "http, https"},
+		{"wan", "lan", "partly", 1, 1, "1 port forward"},
+		{"lan", "guest", "blocked", 0, 0, ""},
+		{"lan", Firewall, "partly", 4, 0, "ICMPv6|ping|ssh from admins|dns"},
+	} {
+		got := find(m, c.from, c.to)
+		if got.Summary != c.summary || got.Allowed != c.allowed || got.Blocked != c.blocked || strings.Join(got.Open, "|") != c.open {
+			t.Errorf("%s → %s: %s +%d -%d %q; want %s +%d -%d %q", c.from, c.to, got.Summary, got.Allowed, got.Blocked, got.Open, c.summary, c.allowed, c.blocked, c.open)
+		}
+	}
+	if c := find(m, "lan", "lan"); !c.SameZone || !strings.Contains(c.Note, "out of eth1") {
+		t.Errorf("same zone: %+v", c)
+	}
+	if c := find(m, "lan", "wan"); c.SameZone || c.Note != "" {
+		t.Errorf("not the same zone: %+v", c)
+	}
+	wl := find(m, "wan", "lan")
+	if strings.Join(wl.Exceptions[0].Marks, ",") != "b-antispoof,b-antispoof6" || strings.Join(wl.Exceptions[1].Marks, ",") != "f30" || strings.Join(wl.Marks, ",") != "r15" {
+		t.Errorf("marks: %+v", wl)
+	}
+	icmp := &model.Rule{Match: model.Match{Services: []string{"icmp/echo-request", "icmp/echo-reply", "icmpv6/echo-request", "ssh"}}}
+	if s := short(icmp, "x"); s != "icmp, icmpv6, ssh" {
+		t.Errorf("short: %q", s)
+	}
+	ssh := &model.Rule{Match: model.Match{Sources: []string{"trusted"}, Services: []string{"ssh"}}, Days: []string{"mon"}}
+	if s := short(ssh, conditions(st, ssh)); s != "ssh from trusted" {
+		t.Errorf("short with a source: %q", s)
+	}
+	if s := short(&model.Rule{Days: []string{"mon"}}, "mon"); s != "mon" {
+		t.Errorf("short of a time: %q", s)
+	}
+	if c := find(m, "lan", Firewall); strings.Join(c.Marks, ",") != "p-input" {
+		t.Errorf("a drop policy's mark: %v", c.Marks)
+	}
+}
+
+// TestRaw: raw rules that are a match and a verdict are read; others stay
+// unknown.
+func TestRaw(t *testing.T) {
+	for _, c := range []struct {
+		raw, verdict, short string
+		ok, forNew          bool
+	}{
+		{"icmpv6 type { nd-router-solicit, nd-neighbor-advert } ip6 hoplimit 255 accept", "allowed", "icmpv6", true, true},
+		{`tcp dport 22 counter log prefix "ssh: " drop comment "x"`, "blocked", "tcp dport 22", true, true},
+		{"ip saddr 10.0.0.1 reject with icmpx type admin-prohibited", "blocked", "ip saddr 10.0.0.1", true, true},
+		{"ct state established,related accept", "allowed", "ct state established,related", true, false},
+		{"ct state { new, untracked } tcp dport 80 accept", "allowed", "ct state { new, untracked } tcp dport 80", true, true},
+		{"counter accept", "allowed", "", true, true},
+		{`iifname "wan" tcp dport 22 accept`, "", "", false, false},
+		{"tcp dport vmap { 22 : accept }", "", "", false, false},
+		{"meta mark set 1 accept", "", "", false, false},
+		{"tcp dport 22 counter", "", "", false, false},
+	} {
+		rr := readRaw(c.raw)
+		if rr.ok != c.ok || c.ok && (rr.verdict != c.verdict || rr.short != c.short || rr.forNew != c.forNew) {
+			t.Errorf("%q: %+v", c.raw, rr)
+		}
+	}
+	// In a pair: an exception that lets ND in, not "unknown".
+	st := state()
+	st.Rules = append(st.Rules, &model.Rule{ID: 90, Chain: "input", Position: 0.5, Raw: "icmpv6 type { nd-router-solicit } ip6 hoplimit 255 accept"})
+	st.Sort()
+	e := find(Build(st), "wan", Firewall).Exceptions
+	found := false
+	for _, x := range e {
+		if x.RuleID == 90 {
+			found = x.Verdict == "allowed" && x.Short == "icmpv6" && strings.HasPrefix(x.What, "raw: icmpv6 type")
+		}
+	}
+	if !found {
+		t.Errorf("the raw ND rule: %+v", e)
+	}
+}

internal/model/addr.go

@@ -32,6 +32,34 @@ func (a Address) String() string {
 	return a.Prefix.String()
 }
 
+// Contains reports whether the entry holds an address.
+func (a Address) Contains(x netip.Addr) bool {
+	x = x.Unmap()
+	if a.First.IsValid() {
+		return x.Is4() == a.First.Is4() && !x.Less(a.First) && !a.End.Less(x)
+	}
+	return a.Prefix.Contains(x)
+}
+
+// Overlaps reports whether the entry and a prefix share an address.
+func (a Address) Overlaps(p netip.Prefix) bool {
+	if !a.First.IsValid() {
+		return a.Prefix.Overlaps(p)
+	}
+	if a.First.Is4() != p.Addr().Is4() {
+		return false
+	}
+	// The prefix's first and last addresses against the range.
+	first := p.Masked().Addr()
+	last := first
+	b := last.AsSlice()
+	for i := p.Bits(); i < len(b)*8; i++ {
+		b[i/8] |= 0x80 >> (i % 8)
+	}
+	last, _ = netip.AddrFromSlice(b)
+	return !last.Less(a.First) && !a.End.Less(first)
+}
+
 // ParseAddress reads an address, a prefix (host bits must be zero) or a
 // range, IPv4 or IPv6.
 func ParseAddress(s string) (Address, error) {

internal/model/auth.go

@@ -7,9 +7,10 @@ import (
 
 // Grant gives access to one resource (see internal/auth).
 type Grant struct {
-	Resource string `json:"resource"` // config, sets, log, audit, *
+	Resource string `json:"resource"` // config, sets, bans, log, audit, *
 	Access   string `json:"access"`   // read or write (write implies read)
-	// Sets limits a "sets" grant to these dynamic sets (none: all).
+	// Sets limits a "sets" grant to these dynamic sets, and a "bans"
+	// grant to these ban lists (none: all).
 	Sets []string `json:"sets,omitempty"`
 }
 

internal/model/bans.go

@@ -0,0 +1,53 @@
+package model
+
+import (
+	"net/netip"
+	"time"
+)
+
+// Ban is an address a ban list keeps out (docs/bans.md): of every port,
+// or of one protocol and port. Bans are kept apart from the
+// configuration, like a dynamic set's entries: not in the history, and
+// not on probation.
+type Ban struct {
+	ID     int64  `json:"id"`
+	ListID int64  `json:"list_id"`
+	List   string `json:"list"`
+	// Address is what is banned: an address, or an IPv6 prefix of the
+	// list's grouping ("2001:db8:1:2::/64").
+	Address  string `json:"address"`
+	Protocol string `json:"protocol,omitempty"` // tcp or udp; "" every port
+	Port     int    `json:"port,omitempty"`
+	// Expires is when the ban ends (nil: it doesn't); Timeout the
+	// seconds it has left then.
+	Expires *time.Time `json:"expires,omitempty"`
+	Timeout int        `json:"timeout,omitempty"`
+	Created time.Time  `json:"created"`
+	// Who banned it (the user or token's name), Source the program's own
+	// name for why ("guard/ssh", "fail2ban/sshd"), Reason free text (a
+	// log line).
+	Who    string `json:"who"`
+	Source string `json:"source,omitempty"`
+	Reason string `json:"reason,omitempty"`
+}
+
+// Prefix is the banned address as a prefix.
+func (b *Ban) Prefix() (netip.Prefix, error) {
+	if p, err := netip.ParsePrefix(b.Address); err == nil {
+		return p, nil
+	}
+	a, err := netip.ParseAddr(b.Address)
+	if err != nil {
+		return netip.Prefix{}, err
+	}
+	return netip.PrefixFrom(a, a.BitLen()), nil
+}
+
+// BanAddress writes a banned prefix: an address alone when it is one
+// address, else the prefix.
+func BanAddress(p netip.Prefix) string {
+	if p.IsSingleIP() {
+		return p.Addr().String()
+	}
+	return p.String()
+}

internal/model/changeset.go

@@ -53,7 +53,10 @@ type Op struct {
 	ID int64 `json:"id,omitempty"`
 	// Data is the object (create), the fields to change (update,
 	// settings) or where to move it (move).
-	Data    json.RawMessage `json:"data,omitempty"`
+	Data json.RawMessage `json:"data,omitempty"`
+	// Place is where a create puts the object in its order (a move's
+	// data); none: at the end.
+	Place   json.RawMessage `json:"place,omitempty"`
 	Summary string          `json:"summary"`
 	AddedAt time.Time       `json:"added_at"`
 }

internal/model/objects.go

@@ -1,6 +1,9 @@
 package model
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 // Chains rules are placed in.
 const (
@@ -71,11 +74,49 @@ type AddressSet struct {
 	Dynamic bool     `json:"dynamic,omitempty"`
 	// Timeout is a dynamic set's default entry lifetime in seconds (0:
 	// entries stay until removed).
-	Timeout int    `json:"timeout,omitempty"`
-	Comment string `json:"comment,omitempty"`
+	Timeout int `json:"timeout,omitempty"`
+	// Jarl makes the set's entries the addresses of names in Jarl, which
+	// housecarld reads and keeps up to date (docs/jarl.md).
+	Jarl    *JarlSource `json:"jarl,omitempty"`
+	Comment string      `json:"comment,omitempty"`
 }
 
-func (s *AddressSet) GetID() int64  { return s.ID }
+func (s *AddressSet) GetID() int64 { return s.ID }
+
+// Runtime reports whether the set's entries come at run time (a dynamic
+// set's, a Jarl set's) rather than from the configuration.
+func (s *AddressSet) Runtime() bool { return s.Dynamic || s.Jarl != nil }
+
+// JarlSource is where a set's addresses come from in Jarl: the A and AAAA
+// records of names (CNAMEs followed), each in a view, kept only where
+// Within allows.
+type JarlSource struct {
+	Names []JarlName `json:"names"`
+	// Within are zone names and addresses (prefixes, ranges): an address
+	// is used only if it lies in a zone's connected networks or in one of
+	// the addresses.
+	Within []string `json:"within"`
+}
+
+// JarlName is a name in Jarl, in a view ("": the only view that has it).
+type JarlName struct {
+	Name string `json:"name"` // "nas.example.com", without the final dot
+	View string `json:"view,omitempty"`
+}
+
+// String is "name" or "name@view".
+func (n JarlName) String() string {
+	if n.View == "" {
+		return n.Name
+	}
+	return n.Name + "@" + n.View
+}
+
+// ParseJarlName reads "name" or "name@view".
+func ParseJarlName(s string) JarlName {
+	name, view, _ := strings.Cut(strings.TrimSpace(s), "@")
+	return JarlName{Name: strings.TrimSuffix(strings.ToLower(strings.TrimSpace(name)), "."), View: strings.TrimSpace(view)}
+}
 func (s *AddressSet) Label() string { return s.Name }
 
 // Service is a named list of ports ("tcp/22", "udp/60000-61000") and ICMP
@@ -274,6 +315,45 @@ func (r *Rule) Groups() (v4, v6 int) {
 	return v4, v6
 }
 
+// What becomes of what a rule's quota used when the rule changes
+// (QuotaCarry).
+const (
+	QuotaKept      = ""          // counted as before: carried as it is
+	QuotaSummed    = "summed"    // per address to a total: the addresses' sum
+	QuotaRegrouped = "regrouped" // per address in wider groups: added up per group
+	QuotaRestarts  = "restarts"  // can't be carried: starts again
+)
+
+// QuotaCarry says what becomes of what old's quota used when the rule
+// becomes new (both the same rule, with quotas), and for QuotaRestarts
+// why. The amount, over and the resets don't matter: only how it counts.
+func QuotaCarry(old, new *Rule) (carry, why string) {
+	if old == nil || new == nil || old.Quota == nil || new.Quota == nil {
+		return QuotaKept, ""
+	}
+	was, is := old.Quota.PerAddress(), new.Quota.PerAddress()
+	words := map[string]string{"saddr": "per source", "daddr": "per destination", "": "in total"}
+	switch {
+	case was == "" && is == "":
+		return QuotaKept, ""
+	case is == "":
+		return QuotaSummed, ""
+	case was == "":
+		return QuotaRestarts, "a total can't be split by address, so each address starts at nothing"
+	case was != is:
+		return QuotaRestarts, "what was counted " + words[was] + " can't be counted " + words[is]
+	}
+	o4, o6 := old.Groups()
+	n4, n6 := new.Groups()
+	switch {
+	case o4 == n4 && o6 == n6:
+		return QuotaKept, ""
+	case n4 > o4 || n6 > o6:
+		return QuotaRestarts, "addresses are grouped more finely now, and a group's use can't be split"
+	}
+	return QuotaRegrouped, ""
+}
+
 // PortForward publishes a service on an inside host: incoming connections
 // to a public address and port are sent on (DNAT) to To[:ToPort], let
 // through the forward chain, and, with Hairpin, also work from inside.
@@ -353,3 +433,103 @@ func (r *Redirect) Label() string {
 	}
 	return fmt.Sprintf("redirect #%d", r.ID)
 }
+
+// Ban list scopes: what a list's bans keep the banned addresses from.
+const (
+	// BanScopeFirewall: the firewall itself (the input chain).
+	BanScopeFirewall = "firewall"
+	// BanScopeHosts: the list's hosts, behind the firewall (the forward
+	// chain, where port forwards' addresses are already translated).
+	BanScopeHosts = "hosts"
+	// BanScopeEverything: the firewall and everything behind it.
+	BanScopeEverything = "everything"
+)
+
+// BanScopes lists the scopes.
+var BanScopes = []string{BanScopeFirewall, BanScopeHosts, BanScopeEverything}
+
+// Ban lists' defaults.
+const (
+	DefaultBanTime    = 3600
+	DefaultBanMaxTime = 7 * 24 * 3600
+	DefaultBanEntries = 10000
+	DefaultBanGroupV6 = 64
+)
+
+// BanList is where a program such as Guard, or fail2ban, bans addresses
+// (docs/bans.md). The program names only the address, and perhaps a
+// protocol and ports; the list says what the address is kept from. The
+// bans themselves are kept apart from the configuration, like a dynamic
+// set's entries.
+type BanList struct {
+	ID    int64  `json:"id"`
+	Name  string `json:"name"`
+	Scope string `json:"scope"`
+	// Hosts are set names or addresses: what scope hosts protects.
+	Hosts []string `json:"hosts,omitempty"`
+	// Never are set names or addresses the list never bans.
+	Never []string `json:"never,omitempty"`
+	// DefaultTime is a ban's length in seconds when none is asked for
+	// (0: an hour); MaxTime the longest (0: a week; -1: no limit, so
+	// bans may be permanent).
+	DefaultTime int `json:"default_time,omitempty"`
+	MaxTime     int `json:"max_time,omitempty"`
+	// MaxEntries limits the bans the list holds (0: 10000).
+	MaxEntries int `json:"max_entries,omitempty"`
+	// GroupV6 is the IPv6 prefix length banned for an address (0: /64,
+	// what one customer usually gets); IPv4 addresses are banned alone.
+	GroupV6  int    `json:"group_v6,omitempty"`
+	Comment  string `json:"comment,omitempty"`
+	Disabled bool   `json:"disabled,omitempty"`
+}
+
+func (b *BanList) GetID() int64  { return b.ID }
+func (b *BanList) Label() string { return b.Name }
+
+// BanTime is the default ban length in seconds.
+func (b *BanList) BanTime() int {
+	if b.DefaultTime > 0 {
+		return b.DefaultTime
+	}
+	return DefaultBanTime
+}
+
+// BanMaxTime is the longest ban in seconds, 0 for no limit.
+func (b *BanList) BanMaxTime() int {
+	switch {
+	case b.MaxTime < 0:
+		return 0
+	case b.MaxTime > 0:
+		return b.MaxTime
+	}
+	return DefaultBanMaxTime
+}
+
+// Entries is the most bans the list holds.
+func (b *BanList) Entries() int {
+	if b.MaxEntries > 0 {
+		return b.MaxEntries
+	}
+	return DefaultBanEntries
+}
+
+// V6Group is the IPv6 prefix length an address is banned with.
+func (b *BanList) V6Group() int {
+	if b.GroupV6 > 0 {
+		return b.GroupV6
+	}
+	return DefaultBanGroupV6
+}
+
+// Covers reports whether the list's bans apply to a chain.
+func (b *BanList) Covers(chain string) bool {
+	switch b.Scope {
+	case BanScopeFirewall:
+		return chain == ChainInput
+	case BanScopeHosts:
+		return chain == ChainForward
+	case BanScopeEverything:
+		return chain == ChainInput || chain == ChainForward
+	}
+	return false
+}

internal/model/quota_test.go

@@ -0,0 +1,26 @@
+package model
+
+import "testing"
+
+func TestQuotaCarry(t *testing.T) {
+	rule := func(per string, v4, v6 int) *Rule {
+		return &Rule{GroupV4: v4, GroupV6: v6, Quota: &Quota{Bytes: 1, PerSource: per == "src", PerDestination: per == "dst"}}
+	}
+	for _, c := range []struct {
+		old, new *Rule
+		want     string
+	}{
+		{rule("", 0, 0), rule("", 0, 0), QuotaKept},
+		{rule("src", 0, 0), rule("src", 32, 64), QuotaKept}, // the defaults, written out
+		{rule("src", 0, 0), rule("", 0, 0), QuotaSummed},
+		{rule("", 0, 0), rule("src", 0, 0), QuotaRestarts},
+		{rule("src", 0, 0), rule("dst", 0, 0), QuotaRestarts},
+		{rule("src", 0, 0), rule("src", 24, 56), QuotaRegrouped},
+		{rule("src", 0, 0), rule("src", 24, 128), QuotaRestarts},
+		{nil, rule("src", 0, 0), QuotaKept},
+	} {
+		if got, _ := QuotaCarry(c.old, c.new); got != c.want {
+			t.Errorf("%+v -> %+v: %q, want %q", c.old, c.new, got, c.want)
+		}
+	}
+}

internal/model/resolve.go

@@ -1,7 +1,8 @@
 package model
 
 // FamilyRefs are a reference list's part for one address family: names of
-// sets that have entries of the family (dynamic sets always do), and
+// sets that have entries of the family (dynamic and Jarl sets always
+// do), and
 // literal entries.
 type FamilyRefs struct {
 	Sets     []string
@@ -38,10 +39,10 @@ func (st *State) SplitRefs(refs []string) (v4, v6 FamilyRefs) {
 	return v4, v6
 }
 
-// Families reports which families a set holds: a dynamic set may get
-// either at run time.
+// Families reports which families a set holds: a dynamic or Jarl set may
+// get either at run time.
 func (s *AddressSet) Families() (v4, v6 bool) {
-	if s.Dynamic {
+	if s.Runtime() {
 		return true, true
 	}
 	for _, e := range s.Entries {

internal/model/state.go

@@ -20,6 +20,7 @@ type State struct {
 	Forwards  []*PortForward `json:"forwards"`
 	SNATs     []*SourceNAT   `json:"snats"`
 	Redirects []*Redirect    `json:"redirects"`
+	BanLists  []*BanList     `json:"ban_lists"`
 }
 
 // Object kinds, for changes and the history.
@@ -32,10 +33,11 @@ const (
 	KindForward  = "forward"
 	KindSNAT     = "snat"
 	KindRedirect = "redirect"
+	KindBanList  = "banlist"
 )
 
 // Kinds lists the object kinds (not settings) in display order.
-var Kinds = []string{KindZone, KindSet, KindService, KindRule, KindForward, KindSNAT, KindRedirect}
+var Kinds = []string{KindZone, KindSet, KindService, KindRule, KindForward, KindSNAT, KindRedirect, KindBanList}
 
 // Object is anything in the State with an ID.
 type Object interface {
@@ -73,6 +75,9 @@ func (st *State) Fill() {
 	if st.Redirects == nil {
 		st.Redirects = []*Redirect{}
 	}
+	if st.BanLists == nil {
+		st.BanLists = []*BanList{}
+	}
 }
 
 // Objects returns the objects of a kind.
@@ -107,6 +112,10 @@ func (st *State) Objects(kind string) []Object {
 		for _, o := range st.Redirects {
 			out = append(out, o)
 		}
+	case KindBanList:
+		for _, o := range st.BanLists {
+			out = append(out, o)
+		}
 	}
 	return out
 }
@@ -141,6 +150,8 @@ func (st *State) Put(kind string, id int64, data json.RawMessage) error {
 		return put(&st.SNATs, id, data)
 	case KindRedirect:
 		return put(&st.Redirects, id, data)
+	case KindBanList:
+		return put(&st.BanLists, id, data)
 	}
 	return &unknownKind{kind}
 }
@@ -187,6 +198,7 @@ func (st *State) Sort() {
 	sort.SliceStable(st.Zones, func(i, j int) bool { return st.Zones[i].Name < st.Zones[j].Name })
 	sort.SliceStable(st.Sets, func(i, j int) bool { return st.Sets[i].Name < st.Sets[j].Name })
 	sort.SliceStable(st.Services, func(i, j int) bool { return st.Services[i].Name < st.Services[j].Name })
+	sort.SliceStable(st.BanLists, func(i, j int) bool { return st.BanLists[i].Name < st.BanLists[j].Name })
 	sort.SliceStable(st.Rules, func(i, j int) bool {
 		a, b := st.Rules[i], st.Rules[j]
 		if a.Chain != b.Chain {
@@ -262,7 +274,7 @@ func (st *State) ByID(kind string, id int64) Object {
 }
 
 // Find finds an object of a kind by ID or name (zones, sets, services,
-// port forwards) or by ID alone (rules, source NAT, redirects).
+// port forwards, ban lists) or by ID alone (rules, source NAT, redirects).
 func (st *State) Find(kind, ref string) Object {
 	for _, o := range st.Objects(kind) {
 		if itoa(o.GetID()) == ref {
@@ -290,6 +302,20 @@ func (st *State) Find(kind, ref string) Object {
 				return f
 			}
 		}
+	case KindBanList:
+		if b := st.BanList(ref); b != nil {
+			return b
+		}
+	}
+	return nil
+}
+
+// BanList finds a ban list by name.
+func (st *State) BanList(name string) *BanList {
+	for _, b := range st.BanLists {
+		if strings.EqualFold(b.Name, name) {
+			return b
+		}
 	}
 	return nil
 }

internal/names/names.go

@@ -0,0 +1,152 @@
+// Package names finds the names of addresses by reverse lookups, for
+// showing them beside the addresses (connections, the log, quotas,
+// traffic per device). Names are cached and never stored: statistics stay
+// keyed by address.
+package names
+
+import (
+	"context"
+	"errors"
+	"net"
+	"net/netip"
+	"strings"
+	"sync"
+	"time"
+)
+
+// Lookups running at once, and the most names kept.
+const (
+	parallel = 16
+	maxCache = 20000
+)
+
+// Resolver looks up and caches addresses' names.
+type Resolver struct {
+	lookup func(ctx context.Context, addr string) ([]string, error)
+	// ttl is how long a name (or its absence) is kept; a lookup that
+	// failed (a timeout, a server error) is tried again after retry.
+	ttl, retry time.Duration
+	timeout    time.Duration
+	now        func() time.Time
+
+	mu      sync.Mutex
+	cache   map[netip.Addr]entry
+	pending map[netip.Addr]chan struct{}
+	sem     chan struct{}
+}
+
+type entry struct {
+	name    string
+	expires time.Time
+}
+
+// New makes a resolver asking server ("10.10.0.1:53"; "" for the
+// system's, /etc/hosts then /etc/resolv.conf), keeping names for ttl.
+func New(server string, ttl time.Duration) *Resolver {
+	res := &net.Resolver{PreferGo: true}
+	if server != "" {
+		res.Dial = func(ctx context.Context, network, _ string) (net.Conn, error) {
+			var d net.Dialer
+			return d.DialContext(ctx, network, server)
+		}
+	}
+	return NewFunc(res.LookupAddr, ttl)
+}
+
+// NewFunc makes a resolver with its own lookup (tests).
+func NewFunc(lookup func(ctx context.Context, addr string) ([]string, error), ttl time.Duration) *Resolver {
+	return &Resolver{lookup: lookup, ttl: ttl, retry: time.Minute, timeout: 2 * time.Second, now: time.Now,
+		cache: map[netip.Addr]entry{}, pending: map[netip.Addr]chan struct{}{}, sem: make(chan struct{}, parallel)}
+}
+
+// Names returns the names of addrs: those cached, and those looked up
+// within wait. Lookups still running then carry on and are cached for
+// the next call. An address without a name is left out.
+func (r *Resolver) Names(ctx context.Context, addrs []netip.Addr, wait time.Duration) map[netip.Addr]string {
+	out := map[netip.Addr]string{}
+	var waiting []netip.Addr
+	var done []chan struct{}
+	now := r.now()
+	r.mu.Lock()
+	for _, a := range addrs {
+		if e, ok := r.cache[a]; ok && now.Before(e.expires) {
+			if e.name != "" {
+				out[a] = e.name
+			}
+			continue
+		}
+		ch, ok := r.pending[a]
+		if !ok {
+			ch = make(chan struct{})
+			r.pending[a] = ch
+			go r.resolve(a, ch)
+		}
+		waiting = append(waiting, a)
+		done = append(done, ch)
+	}
+	r.mu.Unlock()
+	if len(waiting) == 0 {
+		return out
+	}
+	t := time.NewTimer(wait)
+	defer t.Stop()
+	for _, ch := range done {
+		select {
+		case <-ch:
+		case <-t.C:
+			return r.collect(out, waiting)
+		case <-ctx.Done():
+			return r.collect(out, waiting)
+		}
+	}
+	return r.collect(out, waiting)
+}
+
+// collect adds what the lookups found for addrs.
+func (r *Resolver) collect(out map[netip.Addr]string, addrs []netip.Addr) map[netip.Addr]string {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	for _, a := range addrs {
+		if e, ok := r.cache[a]; ok && e.name != "" {
+			out[a] = e.name
+		}
+	}
+	return out
+}
+
+func (r *Resolver) resolve(a netip.Addr, done chan struct{}) {
+	r.sem <- struct{}{}
+	ctx, cancel := context.WithTimeout(context.Background(), r.timeout)
+	ns, err := r.lookup(ctx, a.String())
+	cancel()
+	<-r.sem
+	e := entry{expires: r.now().Add(r.ttl)}
+	var dnsErr *net.DNSError
+	switch {
+	case err == nil && len(ns) > 0:
+		e.name = strings.TrimSuffix(ns[0], ".")
+	case err != nil && !(errors.As(err, &dnsErr) && dnsErr.IsNotFound):
+		e.expires = r.now().Add(r.retry)
+	}
+	r.mu.Lock()
+	if len(r.cache) >= maxCache {
+		r.prune()
+	}
+	r.cache[a] = e
+	delete(r.pending, a)
+	r.mu.Unlock()
+	close(done)
+}
+
+// prune drops expired names, or all of them when none has expired.
+func (r *Resolver) prune() {
+	now := r.now()
+	for a, e := range r.cache {
+		if !now.Before(e.expires) {
+			delete(r.cache, a)
+		}
+	}
+	if len(r.cache) >= maxCache {
+		clear(r.cache)
+	}
+}

internal/names/names_test.go

@@ -0,0 +1,57 @@
+package names
+
+import (
+	"context"
+	"errors"
+	"net"
+	"net/netip"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestNames(t *testing.T) {
+	var calls atomic.Int32
+	slow := make(chan struct{})
+	r := NewFunc(func(ctx context.Context, addr string) ([]string, error) {
+		calls.Add(1)
+		switch addr {
+		case "10.0.0.1":
+			return []string{"nas.example.net."}, nil
+		case "10.0.0.2":
+			return nil, &net.DNSError{Err: "no such host", Name: addr, IsNotFound: true}
+		case "10.0.0.3":
+			return nil, errors.New("server failure")
+		case "10.0.0.4":
+			<-slow
+			return []string{"slow.example.net."}, nil
+		}
+		return nil, nil
+	}, time.Hour)
+	a := netip.MustParseAddr
+	all := []netip.Addr{a("10.0.0.1"), a("10.0.0.2"), a("10.0.0.3"), a("10.0.0.4")}
+
+	got := r.Names(context.Background(), all, 200*time.Millisecond)
+	if len(got) != 1 || got[a("10.0.0.1")] != "nas.example.net" {
+		t.Fatalf("first call: %v", got)
+	}
+	// The slow lookup finishes later and is there next time; the others
+	// come from the cache, the failure too until it is retried.
+	close(slow)
+	time.Sleep(50 * time.Millisecond)
+	got = r.Names(context.Background(), all, 200*time.Millisecond)
+	if len(got) != 2 || got[a("10.0.0.4")] != "slow.example.net" {
+		t.Fatalf("second call: %v", got)
+	}
+	if n := calls.Load(); n != 4 {
+		t.Fatalf("%d lookups, want 4 (cached)", n)
+	}
+
+	// A failure is tried again after retry, a missing name after ttl.
+	now := time.Now().Add(2 * time.Minute)
+	r.now = func() time.Time { return now }
+	r.Names(context.Background(), all, 200*time.Millisecond)
+	if n := calls.Load(); n != 5 {
+		t.Fatalf("%d lookups, want 5 (the failure again)", n)
+	}
+}

internal/nft/nft.go

@@ -15,6 +15,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"net/netip"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -189,6 +190,30 @@ func (r *Runner) DeleteElement(ctx context.Context, set, addr string) error {
 	return err
 }
 
+// AddBan puts a ban in force: added, or if it is there already, given
+// its new time (nftables keeps an element's old timeout when it is added
+// again, so it is added, deleted and added in one transaction).
+func (r *Runner) AddBan(ctx context.Context, b render.Ban) error {
+	set := render.BanSet(b.List, b.Addr.Addr().Is6(), b.Proto != "")
+	e := render.BanElement(b)
+	t := ""
+	if b.Timeout > 0 {
+		t = fmt.Sprintf(" timeout %ds", b.Timeout)
+	}
+	script := fmt.Sprintf("add element inet %[1]s %[2]s { %[3]s }\ndelete element inet %[1]s %[2]s { %[3]s }\nadd element inet %[1]s %[2]s { %[3]s%[4]s }\n", render.Table, set, e, t)
+	_, err := r.run(ctx, script, "-f", "/dev/stdin")
+	return err
+}
+
+// DeleteBan lifts a ban. One already gone (it ran out) isn't an error.
+func (r *Runner) DeleteBan(ctx context.Context, b render.Ban) error {
+	set := render.BanSet(b.List, b.Addr.Addr().Is6(), b.Proto != "")
+	e := render.BanElement(b)
+	script := fmt.Sprintf("add element inet %[1]s %[2]s { %[3]s }\ndelete element inet %[1]s %[2]s { %[3]s }\n", render.Table, set, e)
+	_, err := r.run(ctx, script, "-f", "/dev/stdin")
+	return err
+}
+
 // ---- reading JSON
 
 // Table is what Housecarl reads back from its table: counters by mark
@@ -366,7 +391,7 @@ func ParseTable(data []byte) (*Table, error) {
 				continue
 			}
 			name := strings.TrimSuffix(strings.TrimSuffix(s.Name, "_v4"), "_v6")
-			if name == s.Name || strings.HasPrefix(s.Name, "meter_") || strings.HasPrefix(s.Name, "conn_") {
+			if name == s.Name || strings.HasPrefix(s.Name, "meter_") || strings.HasPrefix(s.Name, "conn_") || render.IsBanSet(s.Name) {
 				continue
 			}
 			for _, e := range s.Elem {
@@ -422,11 +447,29 @@ type Firewall struct {
 	// restore is the quota usage saved before housecarld (or the machine)
 	// stopped, put back by the next apply.
 	restore *QuotaUsage
+	// adjust are quota changes the next apply makes (AdjustQuota).
+	adjust []QuotaAdjust
+	// quotaRules are the rules with a quota in the ruleset in force, by
+	// ID: what their usage was counted by (nil before the first apply).
+	quotaRules map[int64]*model.Rule
+	// Bans returns the active bans, which every apply puts back (the
+	// database keeps them; nil: none).
+	Bans func() []render.Ban
+	// JarlSets gives the Jarl sets' addresses (nil: none).
+	JarlSets JarlSets
 	// flowDevs are the flowtable's devices in the ruleset in force, by
 	// name, with their interface index then (0: left out, missing).
 	flowDevs map[string]int
 }
 
+// JarlSets are the Jarl sets' addresses (internal/jarlsets).
+type JarlSets interface {
+	// Entries are the addresses for st's Jarl sets: set name → addresses.
+	Entries(st *model.State) map[string][]string
+	// Applied is told what an apply put in force.
+	Applied(entries map[string][]string)
+}
+
 // ifIndex is an interface's index, 0 if it doesn't exist (tests change it).
 var ifIndex = func(name string) int {
 	if i, err := net.InterfaceByName(name); err == nil {
@@ -462,6 +505,119 @@ func (f *Firewall) RestoreQuotas(u *QuotaUsage) {
 	f.restore = u
 }
 
+// QuotaAdjust takes Give bytes off what a quota used (never below zero):
+// the named quota Name, or the entries of the per-address sets Name_v4
+// and Name_v6, Addr's alone if given (the set's key, as listed).
+type QuotaAdjust struct {
+	Name string
+	Addr string
+	Give int64
+}
+
+// AdjustQuota has the next apply change what a quota used.
+func (f *Firewall) AdjustQuota(a QuotaAdjust) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.adjust = append(f.adjust, a)
+}
+
+// apply takes what a's say off u. An entry with nothing left used is
+// dropped, so its quota starts again with its next packet.
+func (u *QuotaUsage) apply(adj []QuotaAdjust) {
+	less := func(used, give int64) int64 {
+		if give >= used {
+			return 0
+		}
+		return used - give
+	}
+	for _, a := range adj {
+		if used, ok := u.Quotas[a.Name]; ok {
+			u.Quotas[a.Name] = less(used, a.Give)
+		}
+		for _, set := range []string{a.Name + "_v4", a.Name + "_v6"} {
+			var kept []render.Element
+			for _, e := range u.QuotaSets[set] {
+				if a.Addr == "" || e.Addr == a.Addr {
+					e.Used = less(e.Used, a.Give)
+				}
+				if e.Used > 0 {
+					kept = append(kept, e)
+				}
+			}
+			if _, ok := u.QuotaSets[set]; ok {
+				u.QuotaSets[set] = kept
+			}
+		}
+	}
+}
+
+// carry keeps what quotas used when their rules now count differently
+// (model.QuotaCarry): per address to a total, the sum; to wider groups,
+// the groups' sums; what can't be carried starts again. was are the
+// rules in force before (nil: nothing to compare with).
+func (u *QuotaUsage) carry(was map[int64]*model.Rule, st *model.State) {
+	for _, r := range st.Rules {
+		old := was[r.ID]
+		carry, _ := model.QuotaCarry(old, r)
+		if carry == model.QuotaKept {
+			continue
+		}
+		name := render.QuotaName(r.ID)
+		sets := []string{name + "_v4", name + "_v6"}
+		switch carry {
+		case model.QuotaSummed:
+			var sum int64
+			for _, set := range sets {
+				for _, e := range u.QuotaSets[set] {
+					sum += e.Used
+				}
+			}
+			if u.Quotas == nil {
+				u.Quotas = map[string]int64{}
+			}
+			u.Quotas[name] = sum
+		case model.QuotaRegrouped:
+			v4, v6 := r.Groups()
+			for _, set := range sets {
+				byKey := map[string]int64{}
+				var order []string
+				for _, e := range u.QuotaSets[set] {
+					a, err := netip.ParseAddr(e.Addr)
+					if err != nil {
+						continue
+					}
+					bits := v4
+					if a.Is6() {
+						bits = v6
+					}
+					p, _ := a.Prefix(bits)
+					k := p.Addr().String()
+					if _, ok := byKey[k]; !ok {
+						order = append(order, k)
+					}
+					byKey[k] += e.Used
+				}
+				if len(order) == 0 {
+					continue
+				}
+				var es []render.Element
+				for _, k := range order {
+					es = append(es, render.Element{Addr: k, Used: byKey[k]})
+				}
+				u.QuotaSets[set] = es
+			}
+			continue
+		}
+		// What was counted the other way goes: a total, or the entries.
+		if carry != model.QuotaSummed {
+			delete(u.Quotas, name)
+		}
+		for _, set := range sets {
+			delete(u.QuotaSets, set)
+		}
+	}
+}
+
 // ResetQuota starts a rule's quota again: the named quota, or the
 // per-address quota sets (both families).
 func (f *Firewall) ResetQuota(ctx context.Context, ruleID int64, perAddress bool) error {
@@ -481,21 +637,24 @@ func (f *Firewall) ResetQuota(ctx context.Context, ruleID int64, perAddress bool
 	return nil
 }
 
-func (f *Firewall) options() render.Options {
+func (f *Firewall) options(st *model.State) render.Options {
 	o := render.Options{Shadow: f.Shadow, ShadowBefore: f.ShadowBefore}
 	if f.Interfaces != nil {
 		o.Interfaces = f.Interfaces()
 	}
+	if f.JarlSets != nil {
+		o.JarlSets = f.JarlSets.Entries(st)
+	}
 	return o
 }
 
 // Render builds the ruleset for st as Apply would.
-func (f *Firewall) Render(st *model.State) *render.Ruleset { return render.Render(st, f.options()) }
+func (f *Firewall) Render(st *model.State) *render.Ruleset { return render.Render(st, f.options(st)) }
 
 // RenderEnforcing builds the ruleset for st as Apply would outside shadow
 // mode.
 func (f *Firewall) RenderEnforcing(st *model.State) *render.Ruleset {
-	o := f.options()
+	o := f.options(st)
 	o.Shadow, o.ShadowBefore = false, false
 	return render.Render(st, o)
 }
@@ -503,7 +662,7 @@ func (f *Firewall) RenderEnforcing(st *model.State) *render.Ruleset {
 // Check implements engine.Firewall. In shadow mode it checks the
 // enforcing ruleset too, so that leaving shadow mode can't fail.
 func (f *Firewall) Check(ctx context.Context, st *model.State) error {
-	if err := f.Runner.Check(ctx, render.Render(st, f.options())); err != nil {
+	if err := f.Runner.Check(ctx, render.Render(st, f.options(st))); err != nil {
 		return err
 	}
 	if f.Shadow {
@@ -518,7 +677,7 @@ func (f *Firewall) Check(ctx context.Context, st *model.State) error {
 func (f *Firewall) Apply(ctx context.Context, st *model.State) error {
 	f.mu.Lock()
 	defer f.mu.Unlock()
-	opt := f.options()
+	opt := f.options(st)
 	var old *Table
 	if data, err := f.Runner.ListTable(ctx); err == nil {
 		if t, err := ParseTable(data); err == nil {
@@ -531,14 +690,31 @@ func (f *Firewall) Apply(ctx context.Context, st *model.State) error {
 		usage = old.QuotaUsage
 	}
 	usage.merge(f.restore)
+	usage.carry(f.quotaRules, st)
+	usage.apply(f.adjust)
+	f.adjust = nil
 	opt.Quotas, opt.QuotaSets = usage.Quotas, usage.QuotaSets
+	if f.Bans != nil {
+		opt.Bans = f.Bans()
+	}
 	if old != nil {
 		opt.DeviceSets = old.DeviceSets
 	}
 	if err := f.Runner.Apply(ctx, render.Render(st, opt)); err != nil {
 		return err
 	}
+	if f.JarlSets != nil {
+		f.JarlSets.Applied(opt.JarlSets)
+	}
 	f.restore = nil
+	f.quotaRules = map[int64]*model.Rule{}
+	for _, r := range st.Rules {
+		if r.Quota != nil {
+			c, q := *r, *r.Quota // only the quota and the grouping are read
+			c.Quota = &q
+			f.quotaRules[r.ID] = &c
+		}
+	}
 	f.flowDevs = map[string]int{}
 	for _, d := range st.Settings.FlowtableDevices {
 		if opt.Interfaces == nil || opt.Interfaces[d] {
@@ -556,9 +732,48 @@ func (f *Firewall) Apply(ctx context.Context, st *model.State) error {
 			f.base[k] = b
 		}
 	}
+	pruneCounters(f.base, st)
 	return nil
 }
 
+// pruneCounters forgets the totals of objects st no longer has (deleted,
+// or replaced by an import with new IDs), so they aren't listed beside
+// the current ones. A disabled object keeps its totals for when it comes
+// back; built-ins and policies are always kept.
+func pruneCounters(base map[string]Counter, st *model.State) {
+	ids := map[string]bool{}
+	for _, r := range st.Rules {
+		ids[fmt.Sprintf("r%d", r.ID)] = true
+	}
+	for _, x := range st.Forwards {
+		ids[fmt.Sprintf("f%d", x.ID)] = true
+	}
+	for _, x := range st.SNATs {
+		ids[fmt.Sprintf("s%d", x.ID)] = true
+	}
+	for _, x := range st.Redirects {
+		ids[fmt.Sprintf("d%d", x.ID)] = true
+	}
+	for _, x := range st.BanLists {
+		ids[render.BanMark(x.ID)] = true
+	}
+	for mark := range base {
+		if strings.HasPrefix(mark, "ban") && strings.Trim(mark[3:], "0123456789") == "" {
+			if !ids[mark] {
+				delete(base, mark)
+			}
+			continue
+		}
+		obj, _, _ := strings.Cut(mark, "-") // f3-hairpin, f3-6 are f3's
+		if len(obj) < 2 || !strings.ContainsRune("rfsd", rune(obj[0])) || strings.Trim(obj[1:], "0123456789") != "" {
+			continue // b-established, p-input
+		}
+		if !ids[obj] {
+			delete(base, mark)
+		}
+	}
+}
+
 // SaveBoot writes the ruleset of st for the boot unit, and the fallback
 // it loads if that fails (FallbackFile), atomically. The boot ruleset has
 // no flowtable: it loads before the network comes up, when its devices
@@ -579,7 +794,13 @@ func (f *Firewall) SaveBoot(st *model.State) error {
 	if err := writeAtomic(FallbackFile(f.BootFile), fallback); err != nil {
 		return err
 	}
-	rs := render.Render(st, render.Options{Interfaces: map[string]bool{}, Shadow: f.Shadow, ShadowBefore: f.ShadowBefore})
+	opt := render.Options{Interfaces: map[string]bool{}, Shadow: f.Shadow, ShadowBefore: f.ShadowBefore}
+	if f.JarlSets != nil {
+		// The addresses last read from Jarl: Jarl may not be reachable yet
+		// at boot.
+		opt.JarlSets = f.JarlSets.Entries(st)
+	}
+	rs := render.Render(st, opt)
 	return writeAtomic(f.BootFile, rs.Text)
 }
 
@@ -631,6 +852,14 @@ func (f *Firewall) AddElement(ctx context.Context, set, addr string, timeout int
 	return f.Runner.AddElement(ctx, set, addr, timeout)
 }
 
+// AddBan puts a ban in force (Runner.AddBan).
+func (f *Firewall) AddBan(ctx context.Context, b render.Ban) error { return f.Runner.AddBan(ctx, b) }
+
+// DeleteBan lifts a ban (Runner.DeleteBan).
+func (f *Firewall) DeleteBan(ctx context.Context, b render.Ban) error {
+	return f.Runner.DeleteBan(ctx, b)
+}
+
 // DeleteElement removes an entry from a dynamic set.
 func (f *Firewall) DeleteElement(ctx context.Context, set, addr string) error {
 	return f.Runner.DeleteElement(ctx, set, addr)

internal/nft/nft_test.go

@@ -3,9 +3,12 @@ package nft
 import (
 	"context"
 	"fmt"
+	"net/netip"
 	"os"
 	"os/exec"
 	"path/filepath"
+	"reflect"
+	"sort"
 	"strings"
 	"testing"
 
@@ -128,6 +131,60 @@ func TestFirewallInContainer(t *testing.T) {
 	}
 }
 
+// fakeJarlSets gives fixed Jarl set addresses.
+type fakeJarlSets struct {
+	entries, applied map[string][]string
+}
+
+func (f *fakeJarlSets) Entries(*model.State) map[string][]string { return f.entries }
+func (f *fakeJarlSets) Applied(e map[string][]string)            { f.applied = e }
+
+// TestJarlSetsInContainer: a Jarl set gets its addresses with each apply,
+// and the new ones replace the old.
+func TestJarlSetsInContainer(t *testing.T) {
+	image := os.Getenv("HOUSECARL_NFT_IMAGE")
+	if image == "" {
+		t.Skip("HOUSECARL_NFT_IMAGE not set")
+	}
+	name := "housecarl-nft-jarl-test"
+	exec.Command("docker", "rm", "-f", name).Run()
+	if out, err := exec.Command("docker", "run", "-d", "--name", name, "--cap-add", "NET_ADMIN", image, "sleep", "300").CombinedOutput(); err != nil {
+		t.Fatalf("starting the container: %v %s", err, out)
+	}
+	t.Cleanup(func() { exec.Command("docker", "rm", "-f", name).Run() })
+	js := &fakeJarlSets{entries: map[string][]string{"nas": {"10.0.0.5", "10.0.0.6", "2001:db8::5"}}}
+	fw := &Firewall{Runner: &Runner{Command: []string{"docker", "exec", "-i", name, "nft"}}, JarlSets: js}
+	ctx := context.Background()
+	st := model.NewState()
+	st.Zones = []*model.Zone{{ID: 1, Name: "lan", Interfaces: []string{"eth0"}}}
+	st.Sets = []*model.AddressSet{{ID: 2, Name: "nas", Jarl: &model.JarlSource{Names: []model.JarlName{{Name: "nas.example.com"}}, Within: []string{"lan"}}}}
+	st.Rules = []*model.Rule{{ID: 3, Chain: model.ChainOutput, Position: 1, Action: model.ActionAccept, Match: model.Match{Destinations: []string{"nas"}}}}
+	elems := func() string {
+		tb, err := fw.Table(ctx)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var got []string
+		for _, e := range tb.Elements["nas"] {
+			got = append(got, e.Addr)
+		}
+		return strings.Join(got, ",")
+	}
+	if err := fw.Apply(ctx, st); err != nil {
+		t.Fatalf("apply: %v", err)
+	}
+	if got := elems(); got != "10.0.0.5,10.0.0.6,2001:db8::5" || len(js.applied["nas"]) != 3 {
+		t.Errorf("after apply: %s (applied %v)", got, js.applied)
+	}
+	js.entries = map[string][]string{"nas": {"10.0.0.7"}}
+	if err := fw.Apply(ctx, st); err != nil {
+		t.Fatalf("reapply: %v", err)
+	}
+	if got := elems(); got != "10.0.0.7" {
+		t.Errorf("after the addresses changed: %s", got)
+	}
+}
+
 // TestQuotasInContainer: quotas keep what they used across a reload,
 // reset by hand, and come back after a reboot from what was saved.
 func TestQuotasInContainer(t *testing.T) {
@@ -185,6 +242,31 @@ func TestQuotasInContainer(t *testing.T) {
 	if t2, d2 := used(); t2 < total || d2 < dev {
 		t.Errorf("after a reload: total %d (was %d), per destination %d (was %d)", t2, total, d2, dev)
 	}
+	// Some given back, and one address started again, by the next apply.
+	total, dev = used()
+	fw.AdjustQuota(QuotaAdjust{Name: "quota_r1", Give: 1000})
+	fw.AdjustQuota(QuotaAdjust{Name: "quota_r2", Addr: "127.0.0.3", Give: 1 << 62})
+	if err := fw.Apply(ctx, st); err != nil {
+		t.Fatal(err)
+	}
+	if t2, d2 := used(); t2 > total-1000 || t2 < total-2000 || d2 != 0 {
+		t.Errorf("after giving back: total %d (was %d, gave 1000), per destination %d (was %d, reset)", t2, total, d2, dev)
+	}
+	// Counted in total now: what the addresses used carries over.
+	ping("127.0.0.3")
+	_, dev = used()
+	st.Rules[1].Quota.PerDestination = false
+	if err := fw.Apply(ctx, st); err != nil {
+		t.Fatal(err)
+	}
+	tb, _ := fw.Table(ctx)
+	if tb.Quotas["quota_r2"] < dev || dev == 0 {
+		t.Errorf("per destination to a total: %d, was %d", tb.Quotas["quota_r2"], dev)
+	}
+	st.Rules[1].Quota.PerDestination = true
+	if err := fw.Apply(ctx, st); err != nil {
+		t.Fatal(err)
+	}
 	// Reset by hand.
 	if err := fw.ResetQuota(ctx, 1, false); err != nil {
 		t.Fatal(err)
@@ -199,7 +281,7 @@ func TestQuotasInContainer(t *testing.T) {
 	// saved usage comes back.
 	ping("127.0.0.2")
 	ping("127.0.0.3")
-	tb, _ := fw.Table(ctx)
+	tb, _ = fw.Table(ctx)
 	saved := tb.QuotaUsage
 	exec.Command("docker", "exec", name, "nft", "delete", "table", "inet", "housecarl").Run()
 	fw.RestoreQuotas(&saved)
@@ -211,6 +293,62 @@ func TestQuotasInContainer(t *testing.T) {
 	}
 }
 
+// TestQuotaAdjust: giving back takes off what was used, never below
+// zero; an entry with nothing left goes.
+func TestQuotaAdjust(t *testing.T) {
+	u := QuotaUsage{Quotas: map[string]int64{"quota_r1": 5000, "quota_r9": 10},
+		QuotaSets: map[string][]render.Element{"quota_r2_v4": {{Addr: "10.0.0.1", Used: 3000}, {Addr: "10.0.0.2", Used: 4000}},
+			"quota_r2_v6": {{Addr: "2001:db8::", Used: 100}}}}
+	u.apply([]QuotaAdjust{{Name: "quota_r1", Give: 2000}, {Name: "quota_r9", Give: 2000}, {Name: "quota_r2", Addr: "10.0.0.2", Give: 1500},
+		{Name: "quota_r2", Give: 100}})
+	if u.Quotas["quota_r1"] != 3000 || u.Quotas["quota_r9"] != 0 {
+		t.Errorf("named: %v", u.Quotas)
+	}
+	want := map[string][]render.Element{"quota_r2_v4": {{Addr: "10.0.0.1", Used: 2900}, {Addr: "10.0.0.2", Used: 2400}}, "quota_r2_v6": nil}
+	if !reflect.DeepEqual(u.QuotaSets, want) {
+		t.Errorf("sets: %+v", u.QuotaSets)
+	}
+}
+
+// TestQuotaCarry: usage follows a rule counting its quota differently.
+func TestQuotaCarry(t *testing.T) {
+	perSource := &model.Rule{ID: 2, Quota: &model.Quota{Bytes: 1 << 30, PerSource: true}}
+	usage := func() QuotaUsage {
+		return QuotaUsage{Quotas: map[string]int64{}, QuotaSets: map[string][]render.Element{
+			"quota_r2_v4": {{Addr: "10.0.0.1", Used: 100}, {Addr: "10.0.0.2", Used: 50}},
+			"quota_r2_v6": {{Addr: "2001:db8:0:1::", Used: 7}, {Addr: "2001:db8:0:2::", Used: 3}}}}
+	}
+	was := map[int64]*model.Rule{2: perSource}
+	with := func(f func(r *model.Rule)) *model.State {
+		r := *perSource
+		q := *perSource.Quota
+		r.Quota = &q
+		f(&r)
+		return &model.State{Rules: []*model.Rule{&r}}
+	}
+	u := usage()
+	u.carry(was, with(func(r *model.Rule) { r.Quota.PerSource = false }))
+	if u.Quotas["quota_r2"] != 160 || len(u.QuotaSets["quota_r2_v4"]) != 0 {
+		t.Errorf("to a total: %+v", u)
+	}
+	u = usage()
+	u.carry(was, with(func(r *model.Rule) { r.GroupV4, r.GroupV6 = 24, 48 }))
+	want := map[string][]render.Element{"quota_r2_v4": {{Addr: "10.0.0.0", Used: 150}}, "quota_r2_v6": {{Addr: "2001:db8::", Used: 10}}}
+	if !reflect.DeepEqual(u.QuotaSets, want) {
+		t.Errorf("wider groups: %+v", u.QuotaSets)
+	}
+	u = usage()
+	u.carry(was, with(func(r *model.Rule) { r.Quota.PerSource, r.Quota.PerDestination = false, true }))
+	if len(u.QuotaSets) != 0 {
+		t.Errorf("per destination now: %+v", u.QuotaSets)
+	}
+	u = usage()
+	u.carry(nil, with(func(r *model.Rule) { r.Quota.PerSource = false }))
+	if len(u.QuotaSets["quota_r2_v4"]) != 2 || u.Quotas["quota_r2"] != 0 {
+		t.Errorf("nothing to compare with (the first apply): %+v", u)
+	}
+}
+
 // TestDeviceCountsInContainer: the per-device counters are read back and
 // survive a reload.
 func TestDeviceCountsInContainer(t *testing.T) {
@@ -437,3 +575,89 @@ func TestShadowInContainer(t *testing.T) {
 		t.Errorf("the shadow fallback isn't recognised: %+v %v", tb, err)
 	}
 }
+
+// TestPruneCounters: the totals of objects gone (an import with --replace
+// gives every object a new ID) are forgotten; built-ins, policies and
+// disabled objects keep theirs.
+func TestPruneCounters(t *testing.T) {
+	base := map[string]Counter{}
+	for _, m := range []string{"r1", "r2", "r3", "f4", "f4-hairpin", "f4-6", "f5-hairpin", "s6", "d7", "d8", "b-established", "p-input", "fallback-input"} {
+		base[m] = Counter{Packets: 1}
+	}
+	st := model.NewState()
+	st.Rules = []*model.Rule{{ID: 1}, {ID: 3, Disabled: true}}
+	st.Forwards = []*model.PortForward{{ID: 4}}
+	st.Redirects = []*model.Redirect{{ID: 8}}
+	pruneCounters(base, st)
+	var got []string
+	for m := range base {
+		got = append(got, m)
+	}
+	sort.Strings(got)
+	if strings.Join(got, " ") != "b-established d8 f4 f4-6 f4-hairpin fallback-input p-input r1 r3" {
+		t.Errorf("kept %v", got)
+	}
+}
+
+// TestBansInContainer: a ban goes in, a second one renews its time, a
+// reload keeps the bans the database has, and lifting one already gone
+// isn't an error.
+func TestBansInContainer(t *testing.T) {
+	image := os.Getenv("HOUSECARL_NFT_IMAGE")
+	if image == "" {
+		t.Skip("HOUSECARL_NFT_IMAGE not set")
+	}
+	name := "housecarl-nft-bans"
+	exec.Command("docker", "rm", "-f", name).Run()
+	if out, err := exec.Command("docker", "run", "-d", "--name", name, "--cap-add", "NET_ADMIN", image, "sleep", "300").CombinedOutput(); err != nil {
+		t.Fatalf("starting the container: %v %s", err, out)
+	}
+	t.Cleanup(func() { exec.Command("docker", "rm", "-f", name).Run() })
+	var active []render.Ban
+	fw := &Firewall{Runner: &Runner{Command: []string{"docker", "exec", "-i", name, "nft"}}, Bans: func() []render.Ban { return active }}
+	ctx := context.Background()
+	st := model.NewState()
+	st.Zones = []*model.Zone{{ID: 1, Name: "wan", Interfaces: []string{"eth0"}, External: true}}
+	st.BanLists = []*model.BanList{{ID: 2, Name: "router", Scope: model.BanScopeFirewall}}
+	if err := fw.Apply(ctx, st); err != nil {
+		t.Fatalf("apply: %v", err)
+	}
+	list := func(set string) string {
+		out, _ := exec.Command("docker", "exec", name, "nft", "list", "set", "inet", "housecarl", set).CombinedOutput()
+		return string(out)
+	}
+	b := render.Ban{List: 2, Addr: netip.MustParsePrefix("203.0.113.9/32"), Timeout: 60}
+	if err := fw.AddBan(ctx, b); err != nil {
+		t.Fatal(err)
+	}
+	b.Timeout = 7200
+	if err := fw.AddBan(ctx, b); err != nil {
+		t.Fatalf("renewing: %v", err)
+	}
+	if got := list("ban_2_v4"); !strings.Contains(got, "203.0.113.9 timeout 2h") {
+		t.Errorf("renewed ban: %s", got)
+	}
+	svc := render.Ban{List: 2, Addr: netip.MustParsePrefix("2001:db8:1:2::/64"), Proto: "tcp", Port: 22}
+	if err := fw.AddBan(ctx, svc); err != nil {
+		t.Fatal(err)
+	}
+	active = []render.Ban{svc}
+	if err := fw.Apply(ctx, st); err != nil {
+		t.Fatalf("reapply: %v", err)
+	}
+	if got := list("ban_2_v6_svc"); !strings.Contains(got, "2001:db8:1:2:: . 6 . 22") {
+		t.Errorf("after a reload, the database's ban: %s", got)
+	}
+	if got := list("ban_2_v4"); strings.Contains(got, "203.0.113.9") {
+		t.Errorf("after a reload, a ban the database doesn't have: %s", got)
+	}
+	if err := fw.DeleteBan(ctx, svc); err != nil {
+		t.Fatal(err)
+	}
+	if err := fw.DeleteBan(ctx, svc); err != nil {
+		t.Errorf("lifting a ban already gone: %v", err)
+	}
+	if got := list("ban_2_v6_svc"); strings.Contains(got, "2001:db8") {
+		t.Errorf("lifted ban: %s", got)
+	}
+}

internal/render/bans.go

@@ -0,0 +1,139 @@
+package render
+
+import (
+	"fmt"
+	"net/netip"
+	"strings"
+
+	"housecarl/internal/model"
+)
+
+// Ban is an active ban, for rendering (Options.Bans): its list, the
+// address banned (an IPv4 address, or an IPv6 prefix of the list's
+// grouping), and for a ban of one port its protocol and port. Timeout is
+// the seconds it has left (0: it doesn't end).
+type Ban struct {
+	List    int64
+	Addr    netip.Prefix
+	Proto   string // "tcp", "udp", or "" for every port
+	Port    int
+	Timeout int
+}
+
+// BanSet is the name of a ban list's set for a family, and with svc
+// true its set of bans of one port.
+func BanSet(list int64, v6, svc bool) string {
+	name := fmt.Sprintf("ban_%d_v4", list)
+	if v6 {
+		name = fmt.Sprintf("ban_%d_v6", list)
+	}
+	if svc {
+		name += "_svc"
+	}
+	return name
+}
+
+// BanMark is the mark (comment "hc:ban3") of a ban list's rules.
+func BanMark(list int64) string { return fmt.Sprintf("ban%d", list) }
+
+// BanElement is the set element of a ban: "203.0.113.9", or
+// "203.0.113.9 . tcp . 22".
+func BanElement(b Ban) string {
+	e := b.Addr.Addr().String()
+	if b.Proto != "" {
+		e += fmt.Sprintf(" . %s . %d", b.Proto, b.Port)
+	}
+	return e
+}
+
+// IsBanSet reports whether a set is a ban list's.
+func IsBanSet(name string) bool { return strings.HasPrefix(name, "ban_") }
+
+// banSets declares the ban lists' sets.
+func (r *renderer) banSets() {
+	for _, b := range r.st.BanLists {
+		if b.Disabled {
+			continue
+		}
+		obj := "ban list " + b.Name
+		for _, v6 := range []bool{false, true} {
+			r.w.emit(obj, "\tset %s { type %s; flags timeout; }", BanSet(b.ID, v6, false), addrType(v6))
+			r.w.emit(obj, "\tset %s { type %s . inet_proto . inet_service; flags timeout; }", BanSet(b.ID, v6, true), addrType(v6))
+		}
+	}
+}
+
+// banRules writes the drops of the ban lists that cover a chain, ahead
+// of everything that accepts: a banned address's established connections
+// are cut too.
+func (r *renderer) banRules(chain string) {
+	for _, b := range r.st.BanLists {
+		if b.Disabled || !b.Covers(chain) {
+			continue
+		}
+		obj := "ban list " + b.Name
+		d4, d6 := r.st.SplitRefs(b.Hosts)
+		for _, fam := range []string{"v4", "v6"} {
+			dsts := []string{""}
+			if b.Scope == model.BanScopeHosts {
+				refs := d4
+				if fam == "v6" {
+					refs = d6
+				}
+				var ok bool
+				if dsts, ok = addrAlts(fam, "daddr", refs, true, false); !ok {
+					continue
+				}
+			}
+			key := ipKeyword(fam) + " saddr"
+			if fam == "v6" && b.V6Group() < 128 {
+				key += " and " + v6Mask(b.V6Group())
+			}
+			v6 := fam == "v6"
+			for _, d := range dsts {
+				r.banDrop(obj, b.ID, strings.Join(nonEmpty([]string{d, key + " @" + BanSet(b.ID, v6, false)}), " "))
+				r.banDrop(obj, b.ID, strings.Join(nonEmpty([]string{d, key + " . meta l4proto . th dport @" + BanSet(b.ID, v6, true)}), " "))
+			}
+		}
+	}
+}
+
+// banDrop writes one drop of a ban list, or in shadow mode counts it.
+func (r *renderer) banDrop(obj string, list int64, match string) {
+	if r.opt.Shadow {
+		r.w.emit(obj, "\t\t%s counter accept comment \"hc:%s %s\"", match, BanMark(list), Would("drop"))
+		return
+	}
+	r.w.emit(obj, "\t\t%s counter drop comment \"hc:%s\"", match, BanMark(list))
+}
+
+// v6Mask is the mask of an IPv6 prefix length: 64 → ffff:ffff:ffff:ffff::.
+func v6Mask(bits int) string {
+	mask := make([]byte, 16)
+	for i := 0; i < bits; i++ {
+		mask[i/8] |= 0x80 >> (i % 8)
+	}
+	m, _ := netip.AddrFromSlice(mask)
+	return m.String()
+}
+
+// banElements adds the active bans, with the time each has left, so a
+// reload keeps them.
+func (r *renderer) banElements() {
+	for _, ban := range r.opt.Bans {
+		var list *model.BanList
+		for _, b := range r.st.BanLists {
+			if b.ID == ban.List && !b.Disabled {
+				list = b
+			}
+		}
+		if list == nil || !ban.Addr.IsValid() {
+			continue
+		}
+		timeout := ""
+		if ban.Timeout > 0 {
+			timeout = fmt.Sprintf(" timeout %ds", ban.Timeout)
+		}
+		r.w.emit("ban list "+list.Name, "add element inet %s %s { %s%s }", Table, BanSet(list.ID, ban.Addr.Addr().Is6(), ban.Proto != ""), BanElement(ban), timeout)
+	}
+}

internal/render/render.go

@@ -50,6 +50,11 @@ type Options struct {
 	// DeviceSets are the per-device traffic counters' entries
 	// (stats_up_v4 …), so a reload keeps them.
 	DeviceSets map[string][]Element
+	// Bans are the ban lists' active bans, added to their sets.
+	Bans []Ban
+	// JarlSets are the Jarl sets' addresses (set name → addresses, both
+	// families), as Jarl gave them and within allows.
+	JarlSets map[string][]string
 	// Shadow renders for shadow mode: nothing is blocked, rejected,
 	// translated or changed (see the package comment).
 	Shadow bool
@@ -137,6 +142,7 @@ func (r *renderer) render() {
 	w.emit("", "delete table inet %s", Table)
 	w.emit("", "table inet %s {", Table)
 	r.sets()
+	r.banSets()
 	r.deviceSets()
 	devices := r.flowtableDevices()
 	if len(devices) > 0 {
@@ -165,6 +171,7 @@ func (r *renderer) render() {
 	w.line = base + chains.line
 	w.emit("", "}")
 	r.elements()
+	r.banElements()
 }
 
 // ---- sets
@@ -182,6 +189,10 @@ func (r *renderer) sets() {
 			}
 			continue
 		}
+		if s.Jarl != nil {
+			r.jarlSet(s)
+			continue
+		}
 		has4, has6 := s.Families()
 		for _, v6 := range []bool{false, true} {
 			if v6 && !has6 || !v6 && !has4 {
@@ -193,6 +204,26 @@ func (r *renderer) sets() {
 	}
 }
 
+// jarlSet declares a Jarl set's two sets with the addresses it has now
+// (none yet: empty, so its rules match nothing).
+func (r *renderer) jarlSet(s *model.AddressSet) {
+	for _, v6 := range []bool{false, true} {
+		var elems []string
+		for _, e := range r.opt.JarlSets[s.Name] {
+			if a, err := model.ParseAddress(e); err == nil && a.IsV6() == v6 {
+				elems = append(elems, a.String())
+			}
+		}
+		if len(elems) == 0 {
+			r.w.emit("set "+s.Name, "\tset %s { type %s; }", setName(s.Name, v6), addrType(v6))
+			continue
+		}
+		// Single addresses: no interval flag, so they stay as they are
+		// (auto-merge would join neighbours into ranges).
+		r.w.emit("set "+s.Name, "\tset %s { type %s; elements = { %s } }", setName(s.Name, v6), addrType(v6), strings.Join(elems, ", "))
+	}
+}
+
 func (r *renderer) elements() {
 	names := make([]string, 0, len(r.opt.Elements))
 	for n := range r.opt.Elements {
@@ -382,6 +413,7 @@ func (r *renderer) input() {
 	if b.Loopback {
 		r.builtin("loopback", "iifname \"lo\" accept")
 	}
+	r.banRules(model.ChainInput)
 	// Rules that count traffic see every packet: before the established
 	// connections are accepted.
 	r.rules(model.ChainInput, true)
@@ -411,6 +443,7 @@ func (r *renderer) forward(flowtable bool) {
 	st := r.st
 	b := st.Settings.Builtins
 	r.chain("forward", "forward", "filter", st.Settings.ForwardPolicy)
+	r.banRules(model.ChainForward)
 	ext := st.ExternalInterfaces()
 	// Shadow mode changes no packet.
 	if b.MSSClamp && len(ext) > 0 && !r.opt.Shadow {

internal/render/render_test.go

@@ -3,6 +3,7 @@ package render
 import (
 	"context"
 	"fmt"
+	"net/netip"
 	"os"
 	"os/exec"
 	"strings"
@@ -34,6 +35,8 @@ func router() *model.State {
 		{ID: next(), Name: "wg_admins", Entries: []string{"10.50.50.3", "10.50.50.6"}},
 		{ID: next(), Name: "dns_servers", Entries: []string{"10.0.10.5", "217.155.8.194", "fdab:abab:abab:10::5", "2a02:8013:7f3d:10::5"}},
 		{ID: next(), Name: "guests", Dynamic: true, Timeout: 3600},
+		{ID: next(), Name: "nas", Jarl: &model.JarlSource{Names: []model.JarlName{{Name: "nas.example.com", View: "internal"}}, Within: []string{"lan"}}},
+		{ID: next(), Name: "printers", Jarl: &model.JarlSource{Names: []model.JarlName{{Name: "printer.example.com"}}, Within: []string{"lan"}}},
 	}
 	st.Services = []*model.Service{
 		{ID: next(), Name: "jarl", Entries: []string{"tcp/8053"}},
@@ -66,6 +69,7 @@ func router() *model.State {
 	rule(model.ChainForward, model.Rule{Match: model.Match{InZones: []string{"wan"}}, Action: model.ActionDrop, Comment: "nothing else in"})
 	rule(model.ChainForward, model.Rule{Match: model.Match{Destinations: []string{"wg_net"}}, Action: model.ActionDrop})
 	rule(model.ChainForward, model.Rule{Match: model.Match{Services: []string{"ping"}}})
+	rule(model.ChainForward, model.Rule{Match: model.Match{InZones: []string{"wg"}, Destinations: []string{"nas", "printers"}}, Comment: "from Jarl"})
 	rule(model.ChainForward, model.Rule{Match: model.Match{Sources: []string{"wg_net", "trusted", "guests"}}})
 	// Bandwidth: a byte rate, per destination; per /24; quotas, total and
 	// per device.
@@ -95,10 +99,31 @@ func router() *model.State {
 	st.Redirects = []*model.Redirect{
 		{ID: next(), Position: 1, Match: model.Match{InZones: []string{"lan"}, NotDests: true, Destinations: []string{"10.0.10.5"}, Services: []string{"udp/53"}}, Comment: "force DNS"},
 	}
+	st.BanLists = []*model.BanList{
+		{ID: next(), Name: "router", Scope: model.BanScopeFirewall, Never: []string{"trusted"}},
+		{ID: next(), Name: "web", Scope: model.BanScopeHosts, Hosts: []string{"10.0.10.57", "2a02:8013:7f3d:10::57", "dns_servers"}},
+		{ID: next(), Name: "edge", Scope: model.BanScopeEverything, GroupV6: 48},
+		{ID: next(), Name: "off", Scope: model.BanScopeEverything, Disabled: true},
+	}
 	st.Sort()
 	return st
 }
 
+// jarlOptions are the Jarl sets' addresses.
+var jarlOptions = map[string][]string{"nas": {"10.0.10.20", "10.0.10.21", "2a02:8013:7f3d:10::20"}, "printers": {}}
+
+// banOptions are active bans in each ban list, of every port and of one.
+func banOptions(st *model.State) []Ban {
+	var out []Ban
+	for _, b := range st.BanLists {
+		out = append(out,
+			Ban{List: b.ID, Addr: netip.MustParsePrefix("203.0.113.9/32"), Timeout: 3000},
+			Ban{List: b.ID, Addr: netip.MustParsePrefix("2001:db8:1:2::/64"), Proto: "tcp", Port: 22},
+			Ban{List: b.ID, Addr: netip.MustParsePrefix("198.51.100.7/32"), Proto: "udp", Port: 53, Timeout: 60})
+	}
+	return out
+}
+
 // quotaOptions carries quota usage, as a reload does: the guest quota's,
 // and two devices' of the per-device quota.
 func quotaOptions(st *model.State) (map[string]int64, map[string][]Element) {
@@ -118,13 +143,19 @@ func quotaOptions(st *model.State) (map[string]int64, map[string][]Element) {
 func TestRenderRouter(t *testing.T) {
 	st := router()
 	q, qs := quotaOptions(st)
-	rs := Render(st, Options{Elements: map[string][]Element{"guests": {{Addr: "10.0.30.5", Timeout: 1700}}}, Quotas: q, QuotaSets: qs})
+	rs := Render(st, Options{Elements: map[string][]Element{"guests": {{Addr: "10.0.30.5", Timeout: 1700}}}, Quotas: q, QuotaSets: qs, JarlSets: jarlOptions})
 	text := rs.Text
 	for _, want := range []string{
 		"table inet housecarl {}\ndelete table inet housecarl\ntable inet housecarl {",
 		`set trusted_v4 { type ipv4_addr; flags interval; auto-merge; elements = { 10.0.10.0/24, 10.20.30.0/24, 10.50.50.0/24 } }`,
 		`set trusted_v6 { type ipv6_addr; flags interval; auto-merge; elements = { 2a02:8013:7f3d:10::/64 } }`,
 		`set guests_v4 { type ipv4_addr; flags timeout; timeout 3600s; }`,
+		// Jarl sets: their addresses now, or empty.
+		`set nas_v4 { type ipv4_addr; elements = { 10.0.10.20, 10.0.10.21 } }`,
+		`set nas_v6 { type ipv6_addr; elements = { 2a02:8013:7f3d:10::20 } }`,
+		"set printers_v4 { type ipv4_addr; }\n",
+		`iifname "wg0" ip daddr @nas_v4 counter accept`,
+		`iifname "wg0" ip6 daddr @printers_v6 counter accept`,
 		`iifname "wan" ip saddr { 0.0.0.0/8,`,
 		`iifname "wan" ip6 saddr { ::1/128, ::/128, fc00::/7, 2001:db8::/32, ff00::/8, 2a02:8013:7f3d::/48 } counter drop`,
 		`oifname "wan" tcp flags syn tcp option maxseg size set rt mtu comment "hc:b-mss-clamp"`,
@@ -257,9 +288,9 @@ func TestRenderedRulesetPassesNft(t *testing.T) {
 		q, qs := quotaOptions(st)
 		// Enforcing, and in shadow mode after and before other tables.
 		for _, mode := range []Options{{}, {Shadow: true}, {Shadow: true, ShadowBefore: true}} {
-			opt := Options{Elements: map[string][]Element{"guests": {{Addr: "10.0.30.5", Timeout: 1700}, {Addr: "2a02:8013:7f3d:30::5"}}}, Quotas: q, QuotaSets: qs,
+			opt := Options{Elements: map[string][]Element{"guests": {{Addr: "10.0.30.5", Timeout: 1700}, {Addr: "2a02:8013:7f3d:30::5"}}}, Quotas: q, QuotaSets: qs, Bans: banOptions(st),
 				DeviceSets: map[string][]Element{"stats_up_v4": {{Addr: "10.0.10.5", Timeout: 3000, Packets: 7, Bytes: 7000}}, "stats_down_v6": {{Addr: "2001:db8:1:2::", Packets: 1, Bytes: 100}}},
-				Shadow:     mode.Shadow, ShadowBefore: mode.ShadowBefore}
+				JarlSets:   jarlOptions, Shadow: mode.Shadow, ShadowBefore: mode.ShadowBefore}
 			nftCheck(t, cmd, fmt.Sprintf("%s (shadow %v, before %v)", name, mode.Shadow, mode.ShadowBefore), Render(st, opt).Text)
 		}
 	}
@@ -277,3 +308,58 @@ func nftCheck(t *testing.T, cmd []string, name, text string) {
 		}
 	}
 }
+
+func TestRenderBans(t *testing.T) {
+	st := router()
+	id := map[string]int64{}
+	for _, b := range st.BanLists {
+		id[b.Name] = b.ID
+	}
+	text := Render(st, Options{Bans: banOptions(st)}).Text
+	f := func(format string, args ...any) string { return fmt.Sprintf(format, args...) }
+	r, w, e, off := id["router"], id["web"], id["edge"], id["off"]
+	for _, want := range []string{
+		f("set ban_%d_v4 { type ipv4_addr; flags timeout; }", r),
+		f("set ban_%d_v6_svc { type ipv6_addr . inet_proto . inet_service; flags timeout; }", r),
+		// The firewall: in input, every port and one port, /64 for IPv6.
+		f(`ip saddr @ban_%d_v4 counter drop comment "hc:ban%d"`, r, r),
+		f(`ip saddr . meta l4proto . th dport @ban_%d_v4_svc counter drop comment "hc:ban%d"`, r, r),
+		f(`ip6 saddr and ffff:ffff:ffff:ffff:: @ban_%d_v6 counter drop comment "hc:ban%d"`, r, r),
+		f(`ip6 saddr and ffff:ffff:ffff:ffff:: . meta l4proto . th dport @ban_%d_v6_svc counter drop comment "hc:ban%d"`, r, r),
+		// Hosts: in forward, first, to the hosts (literals and sets).
+		f(`ip daddr 10.0.10.57 ip saddr @ban_%d_v4 counter drop`, w),
+		f(`ip daddr @dns_servers_v4 ip saddr . meta l4proto . th dport @ban_%d_v4_svc counter drop`, w),
+		f(`ip6 daddr 2a02:8013:7f3d:10::57 ip6 saddr and ffff:ffff:ffff:ffff:: @ban_%d_v6 counter drop`, w),
+		// Everything: input and forward, /48.
+		f(`ip6 saddr and ffff:ffff:ffff:: @ban_%d_v6 counter drop`, e),
+		// The bans, with their time.
+		f("add element inet housecarl ban_%d_v4 { 203.0.113.9 timeout 3000s }", r),
+		f("add element inet housecarl ban_%d_v6_svc { 2001:db8:1:2:: . tcp . 22 }", w),
+		f("add element inet housecarl ban_%d_v4_svc { 198.51.100.7 . udp . 53 timeout 60s }", e),
+	} {
+		if !strings.Contains(text, want) {
+			t.Errorf("no %q in\n%s", want, text)
+		}
+	}
+	if n := strings.Count(text, f(`@ban_%d_v4 counter drop`, e)); n != 2 {
+		t.Errorf("scope everything: %d rules of every port in IPv4, want 2 (input and forward)", n)
+	}
+	if n := strings.Count(text, f(`@ban_%d_v4 counter drop`, w)); n != 2 {
+		t.Errorf("scope hosts: %d IPv4 rules of every port, want 2 (forward: the literal host and the set)", n)
+	}
+	// Ahead of the accepts: the first rules after loopback, and of forward.
+	in, _, _ := strings.Cut(text[strings.Index(text, "chain input"):], "established")
+	fw, _, _ := strings.Cut(text[strings.Index(text, "chain forward"):], "maxseg")
+	for _, part := range []string{in, fw} {
+		if strings.Contains(part, " accept comment \"hc:r") {
+			t.Errorf("a rule accepts before the bans:\n%s", part)
+		}
+	}
+	if strings.Contains(text, f("ban_%d_", off)) {
+		t.Errorf("a disabled list is rendered")
+	}
+	shadow := Render(st, Options{Shadow: true, Bans: banOptions(st)}).Text
+	if want := f(`ip saddr @ban_%d_v4 counter accept comment "hc:ban%d [would drop]"`, r, r); !strings.Contains(shadow, want) {
+		t.Errorf("shadow: no %q", want)
+	}
+}

internal/server/authn.go

@@ -102,6 +102,8 @@ func (s *Server) authenticate(r *http.Request) (*auth.Principal, *model.Session,
 		p, err := s.tokenPrincipal(r.Context(), strings.TrimSpace(tok), ip, r.UserAgent())
 		if err != nil {
 			s.limiter.fail("ip:" + ip)
+			// For Guard and fail2ban: the address first, so a name can't fake it.
+			s.log.Warn("token refused", "ip", ip, "reason", err.Error())
 			s.eng.Audit(r.Context(), &auth.Principal{IP: ip, Method: "token"}, "auth.token_failed", "", "failure", err.Error())
 			return nil, nil, &httpError{http.StatusUnauthorized, "unauthenticated", "invalid API token: " + err.Error()}
 		}
@@ -246,6 +248,8 @@ func (s *Server) login(w http.ResponseWriter, r *http.Request) error {
 		if err == nil && u.Disabled && ok {
 			reason = "account disabled"
 		}
+		// For Guard and fail2ban: the address first, so a name can't fake it.
+		s.log.Warn("login failed", "ip", ip, "user", name, "reason", reason)
 		s.eng.Audit(r.Context(), who, "auth.login_failed", "user "+name, "failure", reason)
 		return &httpError{http.StatusUnauthorized, "login_failed", "wrong username or password"}
 	}

internal/server/bans_test.go

@@ -0,0 +1,154 @@
+package server
+
+import (
+	"bytes"
+	"context"
+	"log/slog"
+	"strings"
+	"testing"
+
+	"housecarl/internal/api"
+	"housecarl/internal/model"
+	"housecarl/internal/store"
+)
+
+// TestBans: a program with a token for one ban list bans addresses: of
+// a service's ports, every port, or numbers; renewed when banned again;
+// IPv6 by /64; never the inside, the firewall's own, or the list's
+// never; times cut to the list's longest; the address's connections the
+// ban drops are closed; and lifted by ID or address.
+func TestBans(t *testing.T) {
+	e := newEnv(t)
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "wan", Interfaces: []string{"wan"}, External: true}, nil)
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "lan", Interfaces: []string{"eth1"}}, nil)
+	for _, b := range []model.BanList{
+		{Name: "web", Scope: model.BanScopeHosts, Hosts: []string{"10.0.10.57"}, Never: []string{"198.51.100.0/24"}, MaxTime: 3600},
+		{Name: "router", Scope: model.BanScopeFirewall},
+	} {
+		if code := e.call(e.token, "POST", "/banlists", b, nil); code != 201 {
+			t.Fatalf("ban list %s: %d", b.Name, code)
+		}
+	}
+	fc := &fakeConns{list: []api.Connection{
+		{Family: "ipv4", Protocol: "tcp", Source: "203.0.113.9", SourcePort: 40000, Destination: "217.155.8.194", DestinationPort: 2222, DNATTo: "10.0.10.57", DNATPort: 22},
+		{Family: "ipv4", Protocol: "tcp", Source: "203.0.113.9", SourcePort: 40001, Destination: "10.0.10.58", DestinationPort: 22},
+		{Family: "ipv4", Protocol: "tcp", Source: "203.0.113.9", SourcePort: 40002, Destination: "217.155.8.194", DestinationPort: 22},
+	}}
+	e.srv.SetConntrack(fc)
+	var tok api.Token
+	if code := e.call(e.token, "POST", "/me/tokens", api.TokenInput{Name: "guard", Grants: []string{"bans:write:web"}}, &tok); code != 201 {
+		t.Fatalf("token: %d", code)
+	}
+	ban := func(in api.BanInput, want int) api.BanResult {
+		t.Helper()
+		var out api.BanResult
+		var eb api.ErrorBody
+		code := e.call(tok.Secret, "POST", "/banlists/web/bans", in, &out)
+		if code != want {
+			e.call(tok.Secret, "POST", "/banlists/web/bans", in, &eb)
+			t.Errorf("ban %+v: %d, want %d (%+v)", in, code, want, eb)
+		}
+		return out
+	}
+	out := ban(api.BanInput{Address: "203.0.113.9", Ports: []byte(`"ssh"`), Time: 600, Source: "guard/ssh", Reason: "Failed password"}, 201)
+	if len(out.Bans) != 1 || out.Bans[0].Protocol != "tcp" || out.Bans[0].Port != 22 || out.Bans[0].Existing || out.Bans[0].Timeout != 600 {
+		t.Errorf("ssh ban: %+v", out)
+	}
+	if out.Closed != 1 || len(fc.closed) != 1 || fc.closed[0].DNATTo != "10.0.10.57" {
+		t.Errorf("closed %d: %+v (only the one to the list's host)", out.Closed, fc.closed)
+	}
+	if _, ok := e.fw.bans[`ban_`+itoa(out.Bans[0].ListID)+`_v4_svc 203.0.113.9 . tcp . 22`]; !ok {
+		t.Errorf("not in force: %+v", e.fw.bans)
+	}
+	if again := ban(api.BanInput{Address: "203.0.113.9", Ports: []byte(`22`), Protocol: "tcp"}, 201); len(again.Bans) != 1 || !again.Bans[0].Existing {
+		t.Errorf("banned again: %+v", again)
+	}
+	if v6 := ban(api.BanInput{Address: "2001:db8:1:2::77", Time: 99999}, 201); len(v6.Bans) != 1 || v6.Bans[0].Address != "2001:db8:1:2::/64" ||
+		v6.Bans[0].Protocol != "" || v6.Bans[0].Timeout != 3600 {
+		t.Errorf("IPv6, every port, cut to an hour: %+v", v6)
+	}
+	if n := ban(api.BanInput{Address: "::ffff:203.0.113.10", Ports: []byte(`53`)}, 201); len(n.Bans) != 2 || n.Bans[0].Address != "203.0.113.10" {
+		t.Errorf("a number without a protocol is tcp and udp: %+v", n)
+	}
+	if n := ban(api.BanInput{Address: "203.0.113.11", Protocol: "tcp", Ports: []byte(`["http", "https"]`)}, 201); len(n.Bans) != 2 {
+		t.Errorf("two services: %+v", n)
+	}
+	if n := ban(api.BanInput{Address: "203.0.113.12", Protocol: "tcp", Ports: []byte(`"0:65535"`)}, 201); len(n.Bans) != 1 || n.Bans[0].Protocol != "" {
+		t.Errorf("fail2ban's every port: %+v", n)
+	}
+	ban(api.BanInput{Address: "203.0.113.13", Ports: []byte(`"bogus"`)}, 400)
+	ban(api.BanInput{Address: "203.0.113.13", Protocol: "tcp"}, 400)
+	ban(api.BanInput{Address: "not-an-address"}, 400)
+	for _, a := range []string{"198.51.100.4", "10.0.10.99", "217.155.8.194", "127.0.0.1", "fe80::1", "192.168.5.5"} {
+		var eb api.ErrorBody
+		if code := e.call(tok.Secret, "POST", "/banlists/web/bans", api.BanInput{Address: a}, &eb); code != 422 || eb.Error.Code != "never_ban" {
+			t.Errorf("never ban %s: %d %+v", a, code, eb)
+		}
+	}
+	if code := e.call(tok.Secret, "POST", "/banlists/router/bans", api.BanInput{Address: "203.0.113.9"}, nil); code != 403 {
+		t.Errorf("another list: %d", code)
+	}
+	// The program may read its list, and only its list.
+	var bl model.BanList
+	if code := e.call(tok.Secret, "GET", "/banlists/web", nil, &bl); code != 200 || bl.V6Group() != 64 {
+		t.Errorf("reading its list: %d %+v", code, bl)
+	}
+	var lists []model.BanList
+	if e.call(tok.Secret, "GET", "/banlists", nil, &lists); len(lists) != 1 || lists[0].Name != "web" {
+		t.Errorf("lists: %+v", lists)
+	}
+	if code := e.call(tok.Secret, "GET", "/banlists/router", nil, nil); code != 403 {
+		t.Errorf("reading another list: %d", code)
+	}
+	var bans []model.Ban
+	e.call(tok.Secret, "GET", "/banlists/web/bans", nil, &bans)
+	if len(bans) != 7 || bans[0].List != "web" || bans[0].Who != "admin" || bans[0].Source != "guard/ssh" {
+		t.Errorf("bans: %d %+v", len(bans), bans)
+	}
+	var removed map[string]int
+	if code := e.call(tok.Secret, "DELETE", "/banlists/web/bans?address=2001:db8:1:2::5", nil, &removed); code != 200 || removed["removed"] != 1 {
+		t.Errorf("lift by address: %d %+v", code, removed)
+	}
+	if code := e.call(tok.Secret, "DELETE", "/banlists/web/bans/"+itoa(bans[0].ID), nil, &removed); code != 200 || removed["removed"] != 1 {
+		t.Errorf("lift by ID: %d %+v", code, removed)
+	}
+	if code := e.call(tok.Secret, "DELETE", "/banlists/web/bans?address=203.0.113.200", nil, nil); code != 404 {
+		t.Errorf("lifting what isn't banned: %d", code)
+	}
+	if _, ok := e.fw.bans[`ban_`+itoa(bans[0].ListID)+`_v4_svc 203.0.113.9 . tcp . 22`]; ok {
+		t.Errorf("still in force after lifting")
+	}
+	evs, _ := e.srv.store.ListAudit(context.Background(), store.AuditFilter{Action: "ban."})
+	if len(evs) < 10 || !strings.Contains(evs[len(evs)-1].Detail, "guard/ssh: Failed password") {
+		t.Errorf("audit: %d %+v", len(evs), evs[len(evs)-1])
+	}
+	// The list's name is what programs know it by.
+	if code := e.call(e.token, "PATCH", "/banlists/web", map[string]any{"name": "web2"}, nil); code != 409 {
+		t.Errorf("renaming a ban list: %d", code)
+	}
+	// Every apply puts the bans back; a deleted list's go.
+	if got := ActiveBans(context.Background(), e.srv.store); len(got) != 5 {
+		t.Errorf("active bans: %d", len(got))
+	}
+	if code := e.call(e.token, "DELETE", "/banlists/web", nil, nil); code != 200 {
+		t.Errorf("deleting the list: %d", code)
+	}
+	if got := ActiveBans(context.Background(), e.srv.store); len(got) != 0 {
+		t.Errorf("a deleted list's bans: %d", len(got))
+	}
+}
+
+// TestFailedLoginLogged: a failed login and a refused token are logged
+// with the address first, for Guard's and fail2ban's patterns.
+func TestFailedLoginLogged(t *testing.T) {
+	e := newEnv(t)
+	var buf bytes.Buffer
+	e.srv.log = slog.New(slog.NewTextHandler(&buf, nil))
+	e.call("", "POST", "/auth/login", api.Login{Username: `x ip=8.8.8.8`, Password: "wrong"}, nil)
+	e.call("housecarl_aaaaaaaaaaaaaaaa_bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", "GET", "/status", nil, nil)
+	for _, want := range []string{`msg="login failed" ip=127.0.0.1 user="x ip=8.8.8.8"`, `msg="token refused" ip=127.0.0.1 reason=`} {
+		if !strings.Contains(buf.String(), want) {
+			t.Errorf("no %q in\n%s", want, buf.String())
+		}
+	}
+}

internal/server/diff_test.go

@@ -0,0 +1,139 @@
+package server
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+	"testing"
+
+	udiff "github.com/aymanbagabas/go-udiff"
+
+	"housecarl/internal/api"
+	"housecarl/internal/model"
+)
+
+// TestBlockHeaders: each hunk says which chain it is in, even when the
+// chain's own line is far above it.
+func TestBlockHeaders(t *testing.T) {
+	var b strings.Builder
+	b.WriteString("table inet housecarl {\n\tset lan_v4 { type ipv4_addr; }\n\tchain input {\n")
+	for i := 0; i < 20; i++ {
+		b.WriteString("\t\tcounter comment \"in\"\n")
+	}
+	b.WriteString("\t}\n\tchain forward {\n")
+	for i := 0; i < 20; i++ {
+		b.WriteString("\t\tcounter comment \"fw\"\n")
+	}
+	b.WriteString("\t}\n}\n")
+	now := b.String()
+	then := strings.Replace(now, "\t\tcounter comment \"in\"\n\t}", "\t\tcounter comment \"in\"\n\t\taccept comment \"new in\"\n\t}", 1)
+	then = strings.Replace(then, "\t\tcounter comment \"fw\"\n\t}", "\t\taccept comment \"new fw\"\n\t}", 1)
+
+	diff := blockHeaders(udiff.Unified("a", "b", now, then), now, then)
+	var heads []string
+	for _, l := range strings.Split(diff, "\n") {
+		if strings.HasPrefix(l, "@@") {
+			heads = append(heads, l)
+		}
+	}
+	if len(heads) != 2 || !strings.HasSuffix(heads[0], "@@ chain input") || !strings.HasSuffix(heads[1], "@@ chain forward") {
+		t.Fatalf("hunk headers %q, want chain input then chain forward\n%s", heads, diff)
+	}
+	if blockHeaders("", now, then) != "" {
+		t.Fatal("no diff should stay empty")
+	}
+}
+
+// TestHistoryDiff: an entry's diff is its own change, rebuilt from the
+// current configuration however many entries came after it.
+func TestHistoryDiff(t *testing.T) {
+	e := newEnv(t)
+	var mr api.MutationResponse
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "lan", Interfaces: []string{"eth1"}}, nil)
+	e.call(e.token, "POST", "/rules", model.Rule{Chain: "input", Match: model.Match{Services: []string{"ssh"}}, Comment: "first"}, &mr)
+	first := mr.HistoryID
+	e.call(e.token, "POST", "/rules", model.Rule{Chain: "forward", Match: model.Match{Services: []string{"http"}}, Comment: "second"}, nil)
+	e.call(e.token, "PATCH", "/settings", map[string]any{"builtins": map[string]any{"drop_invalid": true}}, nil)
+
+	var out struct{ Diff string }
+	if code := e.call(e.token, "GET", "/history/"+itoa(first)+"/diff", nil, &out); code != 200 {
+		t.Fatalf("diff: %d", code)
+	}
+	var added []string
+	for _, l := range strings.Split(out.Diff, "\n") {
+		if strings.HasPrefix(l, "+") && !strings.HasPrefix(l, "+++") {
+			added = append(added, l)
+		}
+	}
+	if len(added) == 0 || !strings.Contains(strings.Join(added, "\n"), ` first"`) || strings.Contains(out.Diff, ` second"`) || !strings.Contains(out.Diff, "@@ chain input") {
+		t.Errorf("entry %d's diff:\n%s", first, out.Diff)
+	}
+	if code := e.call(e.token, "GET", "/history/9999/diff", nil, nil); code != 404 {
+		t.Errorf("unknown entry: %d", code)
+	}
+}
+
+// TestHunkStarts: after a hunk with unchanged lines between its edits (a
+// moved line), the later hunks' new sides start where they do.
+func TestHunkStarts(t *testing.T) {
+	var a, b strings.Builder
+	for i := 1; i <= 20; i++ {
+		fmt.Fprintf(&a, "%d\n", i)
+		switch i {
+		case 4:
+		case 6:
+			b.WriteString("6\n4\n")
+		case 14:
+		default:
+			fmt.Fprintf(&b, "%d\n", i)
+		}
+	}
+	diff := hunkStarts(udiff.Unified("a", "b", a.String(), b.String()))
+	var heads []string
+	for _, l := range strings.Split(diff, "\n") {
+		if strings.HasPrefix(l, "@@") {
+			heads = append(heads, l)
+		}
+	}
+	// diff -u: the move nets nothing, the deleted 14 one line.
+	if want := []string{"@@ -1,9 +1,9 @@", "@@ -11,7 +11,6 @@"}; strings.Join(heads, "|") != strings.Join(want, "|") {
+		t.Fatalf("hunk headers %q, want %q\n%s", heads, want, diff)
+	}
+}
+
+// TestHistoryDiffUpdate: an update's diff is only what it changed; the
+// object stepped back to its old form stays where it was.
+func TestHistoryDiffUpdate(t *testing.T) {
+	e := newEnv(t)
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "lan", Interfaces: []string{"eth1"}}, nil)
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "wan", Interfaces: []string{"wan"}, External: true}, nil)
+	var ids []int64
+	for i, port := range []string{"8096", "443", "50300", "7777", "25"} {
+		var mr api.MutationResponse
+		e.call(e.token, "POST", "/forwards", map[string]any{"name": "f" + port, "ports": port, "to": fmt.Sprintf("10.0.10.%d", 30+i),
+			"public_addresses": []string{"203.0.113.1"}, "hairpin": true}, &mr)
+		var f model.PortForward
+		if err := json.Unmarshal(mr.Object, &f); err != nil {
+			t.Fatal(err)
+		}
+		ids = append(ids, f.ID)
+	}
+	var mr api.MutationResponse
+	if code := e.call(e.token, "PATCH", "/forwards/"+itoa(ids[2]), map[string]any{"hairpin": false}, &mr); code != 200 {
+		t.Fatalf("update: %d", code)
+	}
+	var out struct{ Diff string }
+	if code := e.call(e.token, "GET", "/history/"+itoa(mr.HistoryID)+"/diff", nil, &out); code != 200 {
+		t.Fatalf("diff: %d", code)
+	}
+	var changed []string
+	for _, l := range strings.Split(out.Diff, "\n") {
+		if (strings.HasPrefix(l, "+") || strings.HasPrefix(l, "-")) && !strings.HasPrefix(l, "+++") && !strings.HasPrefix(l, "---") {
+			changed = append(changed, l)
+		}
+	}
+	if len(changed) != 1 || !strings.HasPrefix(changed[0], "-") || !strings.Contains(changed[0], "-hairpin") ||
+		!strings.Contains(out.Diff, "(before "+itoa(mr.HistoryID)+")") || !strings.Contains(out.Diff, "@@ chain srcnat") {
+		t.Errorf("entry %d's diff, want only the hairpin line gone, in chain srcnat:\n%s", mr.HistoryID, out.Diff)
+	}
+}

internal/server/h_bans.go

@@ -0,0 +1,555 @@
+package server
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/netip"
+	"strconv"
+	"strings"
+	"time"
+
+	"housecarl/internal/api"
+	"housecarl/internal/auth"
+	"housecarl/internal/model"
+	"housecarl/internal/render"
+	"housecarl/internal/store"
+)
+
+// Ban lists (docs/bans.md): the lists are configuration objects; their
+// bans are kept apart, like a dynamic set's entries, audited but not in
+// the history or on probation. A ban is saved first, then put in force;
+// every apply puts all of them back (ActiveBans).
+
+// banList finds a ban list the principal may read or ban into.
+func (s *Server) banList(r *http.Request, p *auth.Principal, write bool) (*model.BanList, error) {
+	ref := r.PathValue("ref")
+	o := s.eng.State().Find(model.KindBanList, ref)
+	if o == nil {
+		if !p.CanBan(ref, write) {
+			return nil, banForbidden(ref, write)
+		}
+		return nil, notFound("no ban list %s", ref)
+	}
+	b := o.(*model.BanList)
+	if !p.CanBan(b.Name, write) {
+		return nil, banForbidden(b.Name, write)
+	}
+	return b, nil
+}
+
+func banForbidden(list string, write bool) error {
+	access := "read"
+	if write {
+		access = "write"
+	}
+	return forbidden("permission denied: this needs bans:%s for %s", access, list)
+}
+
+// ActiveBans are the bans to put back with every apply (nft.Firewall's
+// Bans).
+func ActiveBans(ctx context.Context, st *store.Store) []render.Ban {
+	list, err := st.ListBans(ctx, 0)
+	if err != nil {
+		return nil
+	}
+	out := make([]render.Ban, 0, len(list))
+	for _, b := range list {
+		if rb, ok := renderBan(b); ok {
+			out = append(out, rb)
+		}
+	}
+	return out
+}
+
+func renderBan(b *model.Ban) (render.Ban, bool) {
+	p, err := b.Prefix()
+	if err != nil {
+		return render.Ban{}, false
+	}
+	return render.Ban{List: b.ListID, Addr: p, Proto: b.Protocol, Port: b.Port, Timeout: b.Timeout}, true
+}
+
+// listBans answers GET /banlists/{ref}/bans, and GET /bans: every list's
+// the principal may read.
+func (s *Server) listBans(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	st := s.eng.State()
+	var id int64
+	if r.PathValue("ref") != "" {
+		b, err := s.banList(r, p, false)
+		if err != nil {
+			return err
+		}
+		id = b.ID
+	}
+	all, err := s.store.ListBans(r.Context(), id)
+	if err != nil {
+		return err
+	}
+	out := []*model.Ban{}
+	for _, b := range all {
+		o := st.ByID(model.KindBanList, b.ListID)
+		if o == nil || !p.CanBan(o.Label(), false) {
+			continue
+		}
+		b.List = o.Label()
+		out = append(out, b)
+	}
+	writeJSON(w, http.StatusOK, out)
+	return nil
+}
+
+// addBan answers POST /banlists/{ref}/bans.
+func (s *Server) addBan(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	list, err := s.banList(r, p, true)
+	if err != nil {
+		return err
+	}
+	var in api.BanInput
+	if err := decodeJSON(r, &in); err != nil {
+		return err
+	}
+	st := s.eng.State()
+	if list.Disabled {
+		return conflict("ban list %s is disabled: enable it first", list.Name)
+	}
+	addr, err := netip.ParseAddr(strings.Trim(strings.TrimSpace(in.Address), "[]"))
+	if err != nil {
+		return badRequest("%q isn't an address", in.Address)
+	}
+	addr = addr.Unmap().WithZone("")
+	bits := 32
+	if addr.Is6() {
+		bits = list.V6Group()
+	}
+	prefix := netip.PrefixFrom(addr, bits).Masked()
+	if why := s.neverBan(r.Context(), st, list, p, addr, prefix); why != "" {
+		s.eng.Audit(r.Context(), p, "ban.add", list.Name+" "+model.BanAddress(prefix), "failure", why)
+		return &httpError{http.StatusUnprocessableEntity, "never_ban", fmt.Sprintf("%s isn't banned: %s", model.BanAddress(prefix), why)}
+	}
+	ports, err := banPorts(st, in.Protocol, in.Ports)
+	if err != nil {
+		return badRequest("%v", err)
+	}
+	var expires *time.Time
+	switch secs := banSeconds(list, in.Time); {
+	case secs > 0:
+		t := s.nowFn().Add(time.Duration(secs) * time.Second)
+		expires = &t
+	}
+	if n, err := s.store.CountBans(r.Context(), list.ID); err != nil {
+		return err
+	} else if n+len(ports) > list.Entries() {
+		existing := 0
+		for _, pp := range ports {
+			if s.banExists(r.Context(), list.ID, model.BanAddress(prefix), pp) {
+				existing++
+			}
+		}
+		if n+len(ports)-existing > list.Entries() {
+			return &httpError{http.StatusUnprocessableEntity, "list_full", fmt.Sprintf("ban list %s holds its most bans (%d, max_entries); wait for some to end, or raise it", list.Name, list.Entries())}
+		}
+	}
+	out := api.BanResult{Bans: []api.BanMade{}}
+	for _, pp := range ports {
+		b := &model.Ban{ListID: list.ID, List: list.Name, Address: model.BanAddress(prefix), Protocol: pp.proto, Port: pp.port,
+			Expires: expires, Who: p.Name(), Source: clip(in.Source, 100), Reason: clip(in.Reason, 500)}
+		existing, err := s.store.PutBan(r.Context(), b)
+		if err != nil {
+			return err
+		}
+		if expires != nil {
+			b.Timeout = int(time.Until(*expires).Round(time.Second) / time.Second)
+		}
+		rb, _ := renderBan(b)
+		if err := s.fw.AddBan(r.Context(), rb); err != nil {
+			s.log.Warn("putting a ban in force failed; the next change or restart adds it", "list", list.Name, "address", b.Address, "err", err)
+		}
+		out.Bans = append(out.Bans, api.BanMade{Ban: *b, Existing: existing})
+		detail := b.Source
+		if b.Reason != "" {
+			detail = strings.TrimSpace(detail + ": " + b.Reason)
+		}
+		s.eng.Audit(r.Context(), p, "ban.add", list.Name+" "+banLabel(b), "success", detail)
+	}
+	out.Closed = s.closeBanned(r.Context(), st, list, prefix, ports)
+	writeJSON(w, http.StatusCreated, out)
+	return nil
+}
+
+func (s *Server) banExists(ctx context.Context, list int64, addr string, pp banPort) bool {
+	bans, _ := s.store.ListBans(ctx, list)
+	for _, b := range bans {
+		if b.Address == addr && b.Protocol == pp.proto && b.Port == pp.port {
+			return true
+		}
+	}
+	return false
+}
+
+// banSeconds is a ban's length: what was asked (0 the list's default, -1
+// its longest), cut to the list's longest. 0 means it doesn't end.
+func banSeconds(list *model.BanList, asked int) int {
+	max := list.BanMaxTime()
+	secs := asked
+	switch {
+	case asked == 0:
+		secs = list.BanTime()
+	case asked < 0:
+		secs = max
+	}
+	if max > 0 && secs > max {
+		secs = max
+	}
+	return secs
+}
+
+func banLabel(b *model.Ban) string {
+	if b.Protocol == "" {
+		return b.Address
+	}
+	return fmt.Sprintf("%s %s/%d", b.Address, b.Protocol, b.Port)
+}
+
+func clip(s string, n int) string {
+	s = strings.TrimSpace(s)
+	if len(s) > n {
+		return s[:n]
+	}
+	return s
+}
+
+// banPort is one protocol and port banned; proto "" is every port.
+type banPort struct {
+	proto string
+	port  int
+}
+
+// maxBanPorts is the most ports one ban request may name: a range in a
+// service counts each port.
+const maxBanPorts = 64
+
+// banPorts reads a ban request's protocol and ports (api.BanInput).
+func banPorts(st *model.State, protocol string, raw json.RawMessage) ([]banPort, error) {
+	protocol = strings.ToLower(strings.TrimSpace(protocol))
+	if protocol != "" && protocol != "tcp" && protocol != "udp" && protocol != "all" {
+		return nil, fmt.Errorf("protocol %q: use tcp, udp, or leave it out for every port", protocol)
+	}
+	if protocol == "all" {
+		protocol = ""
+	}
+	var words []string
+	if len(raw) > 0 && string(raw) != "null" {
+		var list []json.RawMessage
+		if json.Unmarshal(raw, &list) != nil {
+			list = []json.RawMessage{raw}
+		}
+		for _, item := range list {
+			var n int
+			var str string
+			switch {
+			case json.Unmarshal(item, &n) == nil:
+				words = append(words, strconv.Itoa(n))
+			case json.Unmarshal(item, &str) == nil:
+				words = append(words, strings.FieldsFunc(str, func(c rune) bool { return c == ',' || c == ' ' })...)
+			default:
+				return nil, fmt.Errorf("ports: give numbers or service names, in a list or a string")
+			}
+		}
+	}
+	if len(words) == 0 {
+		if protocol != "" {
+			return nil, fmt.Errorf("protocol %s without ports: give the ports, or leave the protocol out for every port", protocol)
+		}
+		return []banPort{{}}, nil
+	}
+	protos := []string{"tcp", "udp"}
+	if protocol != "" {
+		protos = []string{protocol}
+	}
+	var out []banPort
+	seen := map[banPort]bool{}
+	add := func(proto string, port int) {
+		bp := banPort{proto, port}
+		if !seen[bp] {
+			seen[bp] = true
+			out = append(out, bp)
+		}
+	}
+	for _, w := range words {
+		lw := strings.ToLower(w)
+		switch lw {
+		case "all", "any", "0:65535", "1:65535", "0-65535", "1-65535":
+			return []banPort{{}}, nil
+		}
+		if n, err := strconv.Atoi(w); err == nil {
+			if n < 1 || n > 65535 {
+				return nil, fmt.Errorf("port %d: use 1 to 65535", n)
+			}
+			for _, p := range protos {
+				add(p, n)
+			}
+			continue
+		}
+		svc := st.Service(w)
+		if svc == nil {
+			return nil, fmt.Errorf("%q is neither a port nor a service (built-in or yours)", w)
+		}
+		matched := false
+		for _, e := range st.ServiceEntries([]string{svc.Name}) {
+			if e.Proto != "tcp" && e.Proto != "udp" || protocol != "" && e.Proto != protocol {
+				continue
+			}
+			for _, part := range strings.Split(e.Ports, ",") {
+				lo, hi, _ := strings.Cut(strings.TrimSpace(part), "-")
+				a, err1 := strconv.Atoi(lo)
+				b := a
+				var err2 error
+				if hi != "" {
+					b, err2 = strconv.Atoi(hi)
+				}
+				if err1 != nil || err2 != nil || b-a >= maxBanPorts {
+					return nil, fmt.Errorf("service %s has the range %s: ban every port instead", svc.Name, part)
+				}
+				for port := a; port <= b; port++ {
+					add(e.Proto, port)
+					matched = true
+				}
+			}
+		}
+		if !matched {
+			return nil, fmt.Errorf("service %s has no %s ports", svc.Name, map[bool]string{true: protocol, false: "tcp or udp"}[protocol != ""])
+		}
+	}
+	if len(out) > maxBanPorts {
+		return nil, fmt.Errorf("%d ports in one ban: ban every port instead (up to %d)", len(out), maxBanPorts)
+	}
+	return out, nil
+}
+
+// neverBan says why an address (banned as prefix) must not be banned, or
+// "": it is the firewall's, an inside network's, the client's own, in the
+// list's never, or not an address one bans.
+func (s *Server) neverBan(ctx context.Context, st *model.State, list *model.BanList, p *auth.Principal, addr netip.Addr, prefix netip.Prefix) string {
+	switch {
+	case addr.IsLoopback(), addr.IsUnspecified(), addr.IsMulticast(), addr.IsLinkLocalUnicast(), addr.IsLinkLocalMulticast():
+		return "it is a loopback, link-local, multicast or unspecified address"
+	}
+	if own, err := netip.ParseAddr(p.IP); err == nil && prefix.Contains(own.Unmap()) {
+		return "it is the address of whoever asked (" + own.Unmap().String() + ")"
+	}
+	inside := s.insideNetworks(st)
+	if inside(addr) || inside(prefix.Addr()) {
+		return "it is inside: in a network of an inside zone, or private"
+	}
+	external := map[string]bool{}
+	for _, z := range st.Zones {
+		external[z.Name] = z.External
+	}
+	for net, zone := range s.connected(st) {
+		if !external[zone] && net.Overlaps(prefix) {
+			return fmt.Sprintf("it overlaps %s, a network of zone %s", net, zone)
+		}
+	}
+	if s.ifaces != nil {
+		if all, err := s.ifaces.All(); err == nil {
+			for name, ps := range all {
+				for _, a := range ps {
+					if prefix.Contains(a.Addr()) {
+						return fmt.Sprintf("it is the firewall's own (%s on %s)", a.Addr(), name)
+					}
+				}
+			}
+		}
+	}
+	for _, o := range st.Settings.OwnPrefixes {
+		if op, err := netip.ParsePrefix(o); err == nil && op.Overlaps(prefix) {
+			return "it is in the firewall's own prefix " + o + " (settings)"
+		}
+	}
+	for _, ref := range list.Never {
+		if why := s.inNever(ctx, st, ref, prefix); why != "" {
+			return why + " (the list's never)"
+		}
+	}
+	return ""
+}
+
+// inNever: is prefix in a never entry (an address, or a set)?
+func (s *Server) inNever(ctx context.Context, st *model.State, ref string, prefix netip.Prefix) string {
+	overlaps := func(entry string) bool {
+		a, err := model.ParseAddress(entry)
+		return err == nil && a.Overlaps(prefix)
+	}
+	if model.IsLiteral(ref) {
+		if overlaps(ref) {
+			return "it is in " + ref
+		}
+		return ""
+	}
+	set := st.Set(ref)
+	if set == nil {
+		return ""
+	}
+	entries := set.Entries
+	if set.Runtime() {
+		if t, err := s.fw.Table(ctx); err == nil {
+			for _, e := range t.Elements[set.Name] {
+				entries = append(entries, e.Addr)
+			}
+		}
+	}
+	for _, e := range entries {
+		if overlaps(e) {
+			return fmt.Sprintf("it is in set %s (%s)", set.Name, e)
+		}
+	}
+	return ""
+}
+
+// closeBanned closes the banned address's connections the list's bans
+// now drop: offloaded to the flowtable, they would go on without
+// reaching the rules. Not in shadow mode, which changes no traffic.
+func (s *Server) closeBanned(ctx context.Context, st *model.State, list *model.BanList, prefix netip.Prefix, ports []banPort) int {
+	if s.cfg.Shadow || s.conns == nil {
+		return 0
+	}
+	conns, err := s.conns.List(ctx)
+	if err != nil {
+		s.log.Warn("listing connections to close a ban's failed", "err", err)
+		return 0
+	}
+	own := map[netip.Addr]bool{}
+	if s.ifaces != nil {
+		if all, err := s.ifaces.All(); err == nil {
+			for _, ps := range all {
+				for _, a := range ps {
+					own[a.Addr()] = true
+				}
+			}
+		}
+	}
+	h4, h6 := st.SplitRefs(list.Hosts)
+	hosts := append(append([]string{}, h4.Literals...), h6.Literals...)
+	for _, name := range append(h4.Sets, h6.Sets...) {
+		if set := st.Set(name); set != nil {
+			hosts = append(hosts, set.Entries...)
+		}
+	}
+	isHost := func(a netip.Addr) bool {
+		for _, h := range hosts {
+			if x, err := model.ParseAddress(h); err == nil && x.Contains(a) {
+				return true
+			}
+		}
+		return false
+	}
+	closed := 0
+	for _, c := range conns {
+		src, err := netip.ParseAddr(c.Source)
+		if err != nil || !prefix.Contains(src.Unmap()) {
+			continue
+		}
+		dst, _ := netip.ParseAddr(c.Destination)
+		port := c.DestinationPort
+		if c.DNATTo != "" {
+			dst, _ = netip.ParseAddr(c.DNATTo)
+			if c.DNATPort != 0 {
+				port = c.DNATPort
+			}
+		}
+		toFirewall := own[dst.Unmap()]
+		switch list.Scope {
+		case model.BanScopeFirewall:
+			if !toFirewall {
+				continue
+			}
+		case model.BanScopeHosts:
+			if toFirewall || !isHost(dst.Unmap()) {
+				continue
+			}
+		}
+		hit := false
+		for _, pp := range ports {
+			hit = hit || pp.proto == "" || pp.proto == c.Protocol && pp.port == port
+		}
+		if !hit {
+			continue
+		}
+		if err := s.conns.Close(ctx, c); err == nil {
+			closed++
+		}
+	}
+	return closed
+}
+
+// deleteBans answers DELETE /banlists/{ref}/bans/{id}, and DELETE
+// /banlists/{ref}/bans?address=A: every ban of that address (any of its
+// grouping), of every port and of each.
+func (s *Server) deleteBans(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	list, err := s.banList(r, p, true)
+	if err != nil {
+		return err
+	}
+	var gone []*model.Ban
+	if idText := r.PathValue("id"); idText != "" {
+		id, err := strconv.ParseInt(idText, 10, 64)
+		if err != nil {
+			return badRequest("ban ID %q isn't a number", idText)
+		}
+		b, err := s.store.GetBan(r.Context(), id)
+		if errors.Is(err, store.ErrNotFound) || err == nil && b.ListID != list.ID {
+			return notFound("no ban %d in ban list %s", id, list.Name)
+		}
+		if err != nil {
+			return err
+		}
+		gone = append(gone, b)
+	} else {
+		q := strings.Trim(strings.TrimSpace(r.URL.Query().Get("address")), "[]")
+		a, err := netip.ParseAddr(q)
+		if err != nil {
+			return badRequest("say which ban: DELETE …/bans/ID, or …/bans?address=ADDRESS")
+		}
+		a = a.Unmap()
+		bans, err := s.store.ListBans(r.Context(), list.ID)
+		if err != nil {
+			return err
+		}
+		for _, b := range bans {
+			if pre, err := b.Prefix(); err == nil && pre.Contains(a) {
+				gone = append(gone, b)
+			}
+		}
+		if len(gone) == 0 {
+			return notFound("%s isn't banned in ban list %s", a, list.Name)
+		}
+	}
+	for _, b := range gone {
+		if err := s.store.DeleteBan(r.Context(), b.ID); err != nil {
+			return err
+		}
+		if rb, ok := renderBan(b); ok {
+			if err := s.fw.DeleteBan(r.Context(), rb); err != nil {
+				s.log.Warn("lifting a ban failed; the next change or restart drops it", "list", list.Name, "address", b.Address, "err", err)
+			}
+		}
+		s.eng.Audit(r.Context(), p, "ban.remove", list.Name+" "+banLabel(b), "success", "")
+	}
+	writeJSON(w, http.StatusOK, map[string]int{"removed": len(gone)})
+	return nil
+}
+
+// pruneBans forgets the bans that ended, and those of lists st no longer
+// has.
+func (s *Server) pruneBans(ctx context.Context, st *model.State) {
+	var ids []int64
+	for _, b := range st.BanLists {
+		ids = append(ids, b.ID)
+	}
+	if _, err := s.store.PruneBans(ctx, ids); err != nil {
+		s.log.Warn("pruning bans failed", "err", err)
+	}
+}

internal/server/h_config.go

@@ -3,9 +3,11 @@ package server
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"net/http"
 	"net/netip"
 	"sort"
+	"strconv"
 	"strings"
 
 	udiff "github.com/aymanbagabas/go-udiff"
@@ -15,6 +17,7 @@ import (
 	"housecarl/internal/engine"
 	"housecarl/internal/matrix"
 	"housecarl/internal/model"
+	"housecarl/internal/nft"
 	"housecarl/internal/store"
 )
 
@@ -96,16 +99,138 @@ func (s *Server) respondChange(w http.ResponseWriter, r *http.Request, p *auth.P
 // rulesetDiff is the unified diff of the rulesets two configurations
 // make: the file housecarl-ruleset.service loads, now and after.
 func (s *Server) rulesetDiff(before, after *model.State) string {
+	return s.labeledDiff(before, after, "now", "after")
+}
+
+// labeledDiff is rulesetDiff with its own names for the two sides.
+func (s *Server) labeledDiff(before, after *model.State, from, to string) string {
 	if before == nil || after == nil {
 		return ""
 	}
-	return udiff.Unified("ruleset.nft (now)", "ruleset.nft (after)", s.fw.Render(before).Text, s.fw.Render(after).Text)
+	now, then := s.fw.Render(before).Text, s.fw.Render(after).Text
+	diff := hunkStarts(udiff.Unified("ruleset.nft ("+from+")", "ruleset.nft ("+to+")", now, then))
+	return blockHeaders(diff, now, then)
+}
+
+// hunkStarts numbers each hunk's new side again, from its old side and
+// the lines the hunks before it added and removed. go-udiff (v0.4.1)
+// leaves out of its count the unchanged lines between two edits of one
+// hunk, so after a hunk like a moved line every later one started too
+// early ("@@ -76,9 +74,9 @@" for "+76,9"), and blockHeaders named the
+// chain before it.
+func hunkStarts(diff string) string {
+	lines := strings.SplitAfter(diff, "\n")
+	delta := 0
+	for i := 0; i < len(lines); i++ {
+		f := strings.Fields(lines[i])
+		if !strings.HasPrefix(lines[i], "@@ ") || len(f) < 4 || f[3] != "@@" {
+			continue
+		}
+		start, _, _ := strings.Cut(f[1][1:], ",")
+		from, err := strconv.Atoi(start)
+		if err != nil {
+			continue
+		}
+		oldN, newN := 0, 0
+		for _, l := range lines[i+1:] {
+			if strings.HasPrefix(l, "@@ ") {
+				break
+			}
+			switch {
+			case strings.HasPrefix(l, "-"):
+				oldN++
+			case strings.HasPrefix(l, "+"):
+				newN++
+			case strings.HasPrefix(l, " "):
+				oldN++
+				newN++
+			}
+		}
+		// An empty side is numbered by the line before it.
+		first := from
+		if oldN == 0 {
+			first++
+		}
+		to := first + delta
+		if newN == 0 {
+			to--
+		}
+		side := "+" + strconv.Itoa(to)
+		if newN > 1 {
+			side += "," + strconv.Itoa(newN)
+		}
+		f[2] = side
+		lines[i] = strings.Join(f, " ") + "\n"
+		delta += newN - oldN
+	}
+	return strings.Join(lines, "")
+}
+
+// blockHeaders names, after each hunk's @@ line, the chain (or other
+// block of the table) the hunk starts in, as git names the function:
+// "@@ -40,6 +40,8 @@ chain forward". Without it a change deep in a long
+// chain doesn't say which chain it is in.
+func blockHeaders(diff, now, then string) string {
+	if diff == "" {
+		return diff
+	}
+	oldBlocks, newBlocks := enclosingBlocks(now), enclosingBlocks(then)
+	lines := strings.SplitAfter(diff, "\n")
+	for i, l := range lines {
+		if !strings.HasPrefix(l, "@@ ") {
+			continue
+		}
+		// "@@ -a,b +c,d @@": the new side's start, or the old side's
+		// when nothing of the hunk is left.
+		f := strings.Fields(l)
+		if len(f) < 4 || f[3] != "@@" {
+			continue
+		}
+		block := blockAt(newBlocks, f[2])
+		if block == "" {
+			block = blockAt(oldBlocks, f[1])
+		}
+		if block != "" {
+			lines[i] = strings.TrimRight(l, "\n") + " " + block + "\n"
+		}
+	}
+	return strings.Join(lines, "")
+}
+
+// enclosingBlocks gives each line of a rendered ruleset the block of the
+// table it is in ("chain input"), "" outside one. A block opens with a
+// line of one tab ending in "{" and closes with "\t}".
+func enclosingBlocks(text string) []string {
+	var out []string
+	cur := ""
+	for _, l := range strings.Split(text, "\n") {
+		if strings.HasPrefix(l, "\t") && !strings.HasPrefix(l, "\t\t") && strings.HasSuffix(l, "{") {
+			cur = strings.TrimSpace(strings.TrimSuffix(l, "{"))
+		}
+		out = append(out, cur)
+		if l == "\t}" {
+			cur = ""
+		}
+	}
+	return out
+}
+
+// blockAt is the block at a hunk side's start ("+40,8" or "-40"); lines
+// count from 1, and an empty side (",0") sits after its line.
+func blockAt(blocks []string, side string) string {
+	start, _, _ := strings.Cut(side[1:], ",")
+	n, err := strconv.Atoi(start)
+	if err != nil || n < 1 || n > len(blocks) {
+		return ""
+	}
+	return blocks[n-1]
 }
 
 // kindOf maps the API's plural path names to kinds.
 var kindOf = map[string]string{
 	"zones": model.KindZone, "sets": model.KindSet, "services": model.KindService, "rules": model.KindRule,
 	"forwards": model.KindForward, "snats": model.KindSNAT, "redirects": model.KindRedirect,
+	"banlists": model.KindBanList,
 }
 
 func pathKind(r *http.Request) (string, error) {
@@ -126,13 +251,16 @@ func findObject(st *model.State, kind, ref string) (model.Object, error) {
 // ---- objects
 
 func (s *Server) listObjects(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	if err := require(p, auth.ResConfig, false); err != nil {
-		return err
-	}
 	kind, err := pathKind(r)
 	if err != nil {
 		return err
 	}
+	if kind == model.KindBanList && !p.Can(auth.ResConfig, false) {
+		return s.listOwnBanLists(w, p)
+	}
+	if err := require(p, auth.ResConfig, false); err != nil {
+		return err
+	}
 	cur, st, draft, err := s.viewState(w, r)
 	if err != nil {
 		return err
@@ -178,13 +306,22 @@ func (s *Server) listObjects(w http.ResponseWriter, r *http.Request, p *auth.Pri
 }
 
 func (s *Server) getObject(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
-	if err := require(p, auth.ResConfig, false); err != nil {
-		return err
-	}
 	kind, err := pathKind(r)
 	if err != nil {
 		return err
 	}
+	// A program that bans into a list may read it (its grouping, times).
+	if kind == model.KindBanList && !p.Can(auth.ResConfig, false) {
+		b, err := s.banList(r, p, false)
+		if err != nil {
+			return err
+		}
+		writeJSON(w, http.StatusOK, b)
+		return nil
+	}
+	if err := require(p, auth.ResConfig, false); err != nil {
+		return err
+	}
 	_, st, _, err := s.viewState(w, r)
 	if err != nil {
 		return err
@@ -221,6 +358,8 @@ func decodeObject(kind string, data []byte) (model.Object, error) {
 		o = &model.SourceNAT{}
 	case model.KindRedirect:
 		o = &model.Redirect{}
+	case model.KindBanList:
+		o = &model.BanList{}
 	}
 	dec := json.NewDecoder(strings.NewReader(string(data)))
 	dec.DisallowUnknownFields()
@@ -272,6 +411,8 @@ func setID(o model.Object, id int64) {
 		x.ID = id
 	case *model.Redirect:
 		x.ID = id
+	case *model.BanList:
+		x.ID = id
 	}
 }
 
@@ -309,7 +450,19 @@ func (s *Server) createObject(w http.ResponseWriter, r *http.Request, p *auth.Pr
 	if _, err := decodeObject(kind, raw); err != nil {
 		return err
 	}
-	return s.change(w, r, p, model.Op{Op: model.OpCreate, Kind: kind, Data: raw})
+	op := model.Op{Op: model.OpCreate, Kind: kind, Data: raw}
+	// ?before=ID, ?after=ID or ?first=1: where it goes in its order.
+	q := r.URL.Query()
+	var place api.MoveInput
+	place.Before, _ = strconv.ParseInt(q.Get("before"), 10, 64)
+	place.After, _ = strconv.ParseInt(q.Get("after"), 10, 64)
+	if queryBool(r, "first") {
+		place.To = "start"
+	}
+	if place.Before != 0 || place.After != 0 || place.To != "" {
+		op.Place, _ = json.Marshal(place)
+	}
+	return s.change(w, r, p, op)
 }
 
 func (s *Server) updateObject(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
@@ -377,6 +530,11 @@ func usedBy(st *model.State, kind string, o model.Object) string {
 				return f.Label()
 			}
 		}
+		for _, b := range st.BanLists {
+			if has(b.Hosts) || has(b.Never) {
+				return "ban list " + b.Name
+			}
+		}
 	}
 	return ""
 }
@@ -419,6 +577,10 @@ func renameRefs(st *model.State, kind, old, now string) {
 			fix(f.PublicAddresses)
 			fix(f.HairpinSources)
 		}
+		for _, b := range st.BanLists {
+			fix(b.Hosts)
+			fix(b.Never)
+		}
 	}
 }
 
@@ -471,12 +633,45 @@ func (s *Server) zoneMatrix(w http.ResponseWriter, r *http.Request, p *auth.Prin
 	if err != nil {
 		return err
 	}
-	writeJSON(w, http.StatusOK, matrix.Build(st, matrix.Options{Connected: s.connected(st)}))
+	m := matrix.Build(st, matrix.Options{Connected: s.connected(st)})
+	if t, err := s.fw.Table(r.Context()); err == nil {
+		matrixHits(&m, t.Counters)
+	}
+	writeJSON(w, http.StatusOK, m)
 	return nil
 }
 
+// matrixHits fills in the hits of the matrix's rules, built-ins and
+// policies from the counters.
+func matrixHits(m *api.Matrix, counters map[string]nft.Counter) {
+	hits := func(marks []string) *uint64 {
+		var n uint64
+		found := false
+		for _, mk := range marks {
+			if c, ok := counters[mk]; ok {
+				n, found = n+c.Packets, true
+			}
+		}
+		if !found {
+			return nil
+		}
+		return &n
+	}
+	for i := range m.Cells {
+		c := &m.Cells[i]
+		c.Hits = hits(c.Marks)
+		for j := range c.Exceptions {
+			c.Exceptions[j].Hits = hits(c.Exceptions[j].Marks)
+		}
+	}
+}
+
 // connected maps the networks on the firewall's interfaces (link-local
 // and loopback aside) to their zones.
+// Connected are the networks connected to the firewall's interfaces,
+// with their zones (link-local and loopback left out).
+func (s *Server) Connected(st *model.State) map[netip.Prefix]string { return s.connected(st) }
+
 func (s *Server) connected(st *model.State) map[netip.Prefix]string {
 	out := map[netip.Prefix]string{}
 	for _, i := range s.hostInterfaces(st) {
@@ -547,6 +742,39 @@ func (s *Server) getHistory(w http.ResponseWriter, r *http.Request, p *auth.Prin
 	return nil
 }
 
+// historyDiff is the ruleset's diff for one history entry: the
+// configurations before and after it, got back by stepping back from
+// the current one through every later entry, rendered by this version.
+func (s *Server) historyDiff(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	if err := require(p, auth.ResConfig, false); err != nil {
+		return err
+	}
+	id, err := pathID(r, "id")
+	if err != nil {
+		return err
+	}
+	hs, err := s.store.HistorySince(r.Context(), id)
+	if err != nil {
+		return err
+	}
+	if len(hs) == 0 || hs[len(hs)-1].ID != id {
+		return notFound("history entry %d not found", id)
+	}
+	st := s.eng.State()
+	var after *model.State
+	for _, h := range hs {
+		if h.ID == id {
+			after = st.Clone()
+		}
+		if err := engine.Rewind(st, h); err != nil {
+			return err
+		}
+	}
+	before, done := fmt.Sprintf("before %d", id), fmt.Sprintf("after %d", id)
+	writeJSON(w, http.StatusOK, map[string]string{"diff": s.labeledDiff(st, after, before, done)})
+	return nil
+}
+
 func (s *Server) revertHistory(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
 	if err := require(p, auth.ResConfig, true); err != nil {
 		return err
@@ -626,3 +854,19 @@ func (s *Server) rollbackChanges(w http.ResponseWriter, r *http.Request, p *auth
 	writeJSON(w, http.StatusOK, map[string]int{"rolled_back": n})
 	return nil
 }
+
+// listOwnBanLists lists the ban lists a principal without config:read
+// may use.
+func (s *Server) listOwnBanLists(w http.ResponseWriter, p *auth.Principal) error {
+	out := []*model.BanList{}
+	for _, b := range s.eng.State().BanLists {
+		if p.CanBan(b.Name, false) {
+			out = append(out, b)
+		}
+	}
+	if len(out) == 0 && !p.Can(auth.ResBans, false) {
+		return require(p, auth.ResConfig, false)
+	}
+	writeJSON(w, http.StatusOK, out)
+	return nil
+}

internal/server/h_status.go

@@ -84,16 +84,21 @@ var nftablesUnitLinks = []string{
 
 // hostProblems are warnings about the machine rather than the
 // configuration: another ruleset that still loads at boot, or the table
-// an import came from, still in force beside Housecarl's. ruleset is the
+// an import came from, still in force beside Housecarl's, and the Jarl
+// sets' names that give no addresses. ruleset is the
 // machine's (nft -j list ruleset; nil: not read). In shadow mode those
 // are expected; the warnings are that nothing else filters, and the raw
 // rules left out.
 func (s *Server) hostProblems(ctx context.Context, ruleset []byte) []validate.Problem {
+	var jarl []validate.Problem
+	if s.cfg.JarlSets != nil {
+		jarl = s.cfg.JarlSets.Problems(s.eng.State())
+	}
 	if s.cfg.Shadow {
-		return s.shadowProblems(ruleset)
+		return append(s.shadowProblems(ruleset), jarl...)
 	}
 	others := otherTables(ruleset)
-	var out []validate.Problem
+	out := jarl
 	for _, link := range s.unitLinks {
 		if _, err := os.Lstat(link); err == nil {
 			out = append(out, validate.Problem{Severity: validate.Warning, Code: "nftables_service", Object: "nftables.service",
@@ -284,6 +289,53 @@ func (s *Server) deleteElement(w http.ResponseWriter, r *http.Request, p *auth.P
 	return nil
 }
 
+// ---- Jarl sets
+
+// jarlSet is the Jarl set a request names.
+func (s *Server) jarlSet(r *http.Request, p *auth.Principal) (*model.State, *model.AddressSet, error) {
+	name := r.PathValue("ref")
+	if !p.CanSet(name, false) {
+		return nil, nil, forbidden("permission denied: this needs sets:read for %s", name)
+	}
+	st := s.eng.State()
+	set := st.Set(name)
+	if set == nil {
+		return nil, nil, notFound("no set %s", name)
+	}
+	if set.Jarl == nil {
+		return nil, nil, badRequest("set %s doesn't take its addresses from Jarl", set.Name)
+	}
+	if s.cfg.JarlSets == nil {
+		return nil, nil, conflict("this housecarld doesn't read Jarl sets")
+	}
+	return st, set, nil
+}
+
+// jarlStatus: GET /sets/{ref}/jarl.
+func (s *Server) jarlStatus(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	st, set, err := s.jarlSet(r, p)
+	if err != nil {
+		return err
+	}
+	writeJSON(w, http.StatusOK, s.cfg.JarlSets.Status(st, set))
+	return nil
+}
+
+// jarlRefresh: POST /sets/{ref}/jarl/refresh reads Jarl now (every Jarl
+// set) and answers as GET does.
+func (s *Server) jarlRefresh(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	if _, _, err := s.jarlSet(r, p); err != nil {
+		return err
+	}
+	s.cfg.JarlSets.Refresh(r.Context())
+	st, set, err := s.jarlSet(r, p)
+	if err != nil {
+		return err
+	}
+	writeJSON(w, http.StatusOK, s.cfg.JarlSets.Status(st, set))
+	return nil
+}
+
 // ---- the log
 
 // logRing keeps the latest logged packets.

internal/server/h_traffic.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"net/netip"
 	"sort"
 	"strconv"
 	"strings"
@@ -88,6 +89,83 @@ func (s *Server) listConnections(w http.ResponseWriter, r *http.Request, p *auth
 	return nil
 }
 
+// lookupNames finds the names of the inside addresses asked about
+// (docs/configuration.md#names), waiting at most a second for lookups.
+func (s *Server) lookupNames(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
+	if err := require(p, auth.ResLog, false); err != nil {
+		return err
+	}
+	var in api.NamesInput
+	if err := decodeJSON(r, &in); err != nil {
+		return err
+	}
+	if len(in.Addresses) > maxNames {
+		return badRequest("ask for at most %d addresses at once", maxNames)
+	}
+	out := api.Names{Enabled: s.cfg.Names != nil, Names: map[string]string{}}
+	if s.cfg.Names == nil {
+		writeJSON(w, http.StatusOK, out)
+		return nil
+	}
+	inside := s.insideNetworks(s.eng.State())
+	asked := map[netip.Addr][]string{}
+	var addrs []netip.Addr
+	for _, a := range in.Addresses {
+		ad, err := netip.ParseAddr(a)
+		if err != nil || !inside(ad.Unmap()) {
+			continue
+		}
+		ad = ad.Unmap()
+		if _, ok := asked[ad]; !ok {
+			addrs = append(addrs, ad)
+		}
+		asked[ad] = append(asked[ad], a)
+	}
+	for a, n := range s.cfg.Names.Names(r.Context(), addrs, time.Second) {
+		for _, as := range asked[a] {
+			out.Names[as] = n
+		}
+	}
+	writeJSON(w, http.StatusOK, out)
+	return nil
+}
+
+// maxNames is the most addresses one POST /names may ask about.
+const maxNames = 2000
+
+// insideNetworks tells inside addresses: in a network connected to an
+// inside zone's interface, or private and not in an external zone's.
+func (s *Server) insideNetworks(st *model.State) func(netip.Addr) bool {
+	external := map[string]bool{}
+	for _, z := range st.Zones {
+		external[z.Name] = z.External
+	}
+	var in, out []netip.Prefix
+	for p, zone := range s.connected(st) {
+		if external[zone] {
+			out = append(out, p)
+		} else {
+			in = append(in, p)
+		}
+	}
+	return func(a netip.Addr) bool {
+		if a.IsLoopback() || a.IsUnspecified() || a.IsMulticast() || a.IsLinkLocalUnicast() {
+			return false
+		}
+		for _, p := range in {
+			if p.Contains(a) {
+				return true
+			}
+		}
+		for _, p := range out {
+			if p.Contains(a) {
+				return false
+			}
+		}
+		return a.IsPrivate()
+	}
+}
+
 // closeConnections deletes tracking entries: the rules check those
 // connections again with their next packet.
 func (s *Server) closeConnections(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {

internal/server/jarlsets_test.go

@@ -0,0 +1,104 @@
+package server
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"housecarl/internal/api"
+	"housecarl/internal/jarl"
+	"housecarl/internal/jarlsets"
+	"housecarl/internal/model"
+	"housecarl/internal/store"
+)
+
+// TestJarlSets: a set from Jarl, through Housecarl's Jarl client against a
+// fake Jarl, filled after a change, with its status and warnings.
+func TestJarlSets(t *testing.T) {
+	records := []map[string]string{
+		{"name": "nas.example.com.", "type": "A", "data": "10.0.10.20"},
+		{"name": "nas.example.com.", "type": "AAAA", "data": "2001:db8:10::20"},
+		{"name": "files.example.com.", "type": "CNAME", "data": "nas.example.com."},
+		{"name": "far.example.com.", "type": "A", "data": "192.0.2.9"},
+	}
+	fake := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Authorization") != "Bearer jarl-token" {
+			w.WriteHeader(401)
+			return
+		}
+		switch r.URL.Path {
+		case "/api/v1/zones":
+			json.NewEncoder(w).Encode([]map[string]any{{"id": 1, "name": "example.com.", "view": "internal", "type": "primary"}})
+		case "/api/v1/zones/1/records":
+			if r.URL.Query().Get("disabled") != "0" {
+				t.Errorf("records asked without disabled=0: %s", r.URL)
+			}
+			json.NewEncoder(w).Encode(records)
+		default:
+			w.WriteHeader(404)
+		}
+	}))
+	t.Cleanup(fake.Close)
+	jc, err := jarl.New(fake.URL, "jarl-token", "", false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	js := &jarlsets.Resolver{Source: jc}
+	e := newEnvWith(t, Config{JarlSets: js})
+	js.State, js.Connected = e.eng.State, e.srv.Connected
+	js.Apply = func(ctx context.Context) error { return e.eng.ApplyCurrent(ctx) }
+	js.Audit = func(ctx context.Context, set, detail string) {
+		e.eng.Audit(ctx, nil, "set.jarl", set, "success", detail)
+	}
+	ctx := context.Background()
+
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "lan", Interfaces: []string{"eth1"}}, nil) // 10.0.10.0/24
+	set := model.AddressSet{Name: "nas", Jarl: &model.JarlSource{Names: []model.JarlName{{Name: "files.example.com"}, {Name: "far.example.com", View: "internal"}}, Within: []string{"lan"}}}
+	if code := e.call(e.token, "POST", "/sets", set, nil); code != 201 {
+		t.Fatalf("create: %d", code)
+	}
+	if code := e.call(e.token, "POST", "/sets", model.AddressSet{Name: "bad", Entries: []string{"10.0.0.1"}, Jarl: set.Jarl}, nil); code != 422 {
+		t.Errorf("entries in a Jarl set: %d", code)
+	}
+	var st api.JarlSet
+	if code := e.call(e.token, "POST", "/sets/nas/jarl/refresh", nil, &st); code != 200 {
+		t.Fatalf("refresh: %d", code)
+	}
+	if strings.Join(st.Entries, ",") != "10.0.10.20" || len(st.Names) != 2 || !st.Configured || st.Read == nil {
+		t.Fatalf("status %+v", st)
+	}
+	files := st.Names[0]
+	if files.Found != "internal" || strings.Join(files.Chain, ",") != "nas.example.com" || len(files.Addresses) != 2 ||
+		!files.Addresses[0].Used || files.Addresses[1].Used || !strings.Contains(files.Addresses[1].Why, "not within lan") {
+		t.Errorf("files: %+v", files)
+	}
+	var status api.Status
+	e.call(e.token, "GET", "/status", nil, &status)
+	n := 0
+	for _, p := range status.Problems {
+		if p.Code == "jarl_outside" {
+			n++
+		}
+	}
+	if n != 2 {
+		t.Errorf("jarl_outside warnings: %d (%+v)", n, status.Problems)
+	}
+	// A Jarl set can be renamed (its addresses go by its names in Jarl).
+	if code := e.call(e.token, "PATCH", "/sets/nas", map[string]any{"name": "storage"}, nil); code != 200 {
+		t.Errorf("rename: %d", code)
+	}
+	if code := e.call(e.token, "GET", "/sets/trusted/jarl", nil, nil); code != 404 {
+		t.Errorf("no such set: %d", code)
+	}
+	e.call(e.token, "POST", "/sets", model.AddressSet{Name: "trusted", Entries: []string{"10.0.10.0/24"}}, nil)
+	if code := e.call(e.token, "GET", "/sets/trusted/jarl", nil, nil); code != 400 {
+		t.Errorf("a set not from Jarl: %d", code)
+	}
+	evs, _ := e.srv.store.ListAudit(ctx, store.AuditFilter{Action: "set.jarl"})
+	if len(evs) != 1 || evs[0].Detail != "added 10.0.10.20" {
+		t.Errorf("audit %+v", evs)
+	}
+}

internal/server/ops.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"sort"
+	"strconv"
 	"strings"
 
 	"housecarl/internal/api"
@@ -63,7 +64,16 @@ func createOp(st *model.State, op *model.Op) (int64, error) {
 		*pos = lastPosition(st, op.Kind, chainOf(o))
 	}
 	data, _ := json.Marshal(o)
-	return op.ID, st.Put(op.Kind, op.ID, data)
+	if err := st.Put(op.Kind, op.ID, data); err != nil {
+		return 0, err
+	}
+	// Placed in the same change, so it is never in force anywhere else.
+	if len(op.Place) > 0 {
+		if _, err := moveOp(st, &model.Op{Op: model.OpMove, Kind: op.Kind, Ref: strconv.FormatInt(op.ID, 10), Data: op.Place}); err != nil {
+			return 0, err
+		}
+	}
+	return op.ID, nil
 }
 
 func updateOp(st *model.State, op *model.Op) (int64, error) {
@@ -94,6 +104,9 @@ func updateOp(st *model.State, op *model.Op) (int64, error) {
 		return 0, err
 	}
 	setID(next, id)
+	if old, now := o.Label(), next.Label(); old != now && op.Kind == model.KindBanList {
+		return 0, conflict("ban list %s can't be renamed: the API tokens and programs (Guard, fail2ban) that ban into it go by its name; make a new list instead", old)
+	}
 	if old, now := o.Label(), next.Label(); old != now && isNamed(op.Kind) {
 		if set, ok := o.(*model.AddressSet); ok && set.Dynamic {
 			return 0, conflict("set %s is dynamic: its entries, and the API tokens and programs that fill it, go by its name; make a new set instead", old)

internal/server/quota.go

@@ -4,8 +4,11 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"math"
 	"net/http"
+	"net/netip"
 	"sort"
+	"strings"
 	"time"
 
 	"housecarl/internal/api"
@@ -237,7 +240,8 @@ func (s *Server) listQuotas(w http.ResponseWriter, r *http.Request, p *auth.Prin
 	return nil
 }
 
-// resetQuota starts a rule's quota again now.
+// resetQuota starts a rule's quota again now: all of it, or one
+// address's; or gives some of what it used back, until its next reset.
 func (s *Server) resetQuota(w http.ResponseWriter, r *http.Request, p *auth.Principal) error {
 	if err := require(p, auth.ResConfig, true); err != nil {
 		return err
@@ -250,14 +254,103 @@ func (s *Server) resetQuota(w http.ResponseWriter, r *http.Request, p *auth.Prin
 	if rule.Quota == nil {
 		return badRequest("%s has no quota", rule.Label())
 	}
-	if err := s.fw.ResetQuota(r.Context(), rule.ID, rule.Quota.PerAddress() != ""); err != nil {
+	var in api.QuotaReset
+	if err := decodeOptional(r, &in); err != nil {
 		return err
 	}
-	resets := s.quotaResets(r.Context())
-	resets[fmt.Sprintf("r%d", rule.ID)] = s.nowFn()
-	s.saveQuotaResets(r.Context(), resets)
-	s.forgetQuotaUsage(r.Context(), rule.ID)
-	s.eng.Audit(r.Context(), p, "quota.reset", rule.Label(), "success", "")
-	writeJSON(w, http.StatusOK, map[string]any{"reset": rule.Label()})
+	if in.Give < 0 {
+		return badRequest("give a number of bytes to give back, 1 or more")
+	}
+	if in.Address == "" && in.Give == 0 {
+		if err := s.fw.ResetQuota(r.Context(), rule.ID, rule.Quota.PerAddress() != ""); err != nil {
+			return err
+		}
+		resets := s.quotaResets(r.Context())
+		resets[fmt.Sprintf("r%d", rule.ID)] = s.nowFn()
+		s.saveQuotaResets(r.Context(), resets)
+		s.forgetQuotaUsage(r.Context(), rule.ID)
+		s.eng.Audit(r.Context(), p, "quota.reset", rule.Label(), "success", "")
+		writeJSON(w, http.StatusOK, map[string]any{"reset": rule.Label()})
+		return nil
+	}
+	name := render.QuotaName(rule.ID)
+	adj := nft.QuotaAdjust{Name: name, Give: in.Give}
+	if in.Address != "" {
+		if rule.Quota.PerAddress() == "" {
+			return badRequest("%s has one quota for everything it matches, not one per address: leave out the address", rule.Label())
+		}
+		key, err := quotaKey(rule, in.Address)
+		if err != nil {
+			return err
+		}
+		if !s.quotaHas(r.Context(), name, key) {
+			return notFound("%s hasn't used the quota of %s since its last reset", in.Address, rule.Label())
+		}
+		adj.Addr = key
+	}
+	if adj.Give == 0 {
+		adj.Give = math.MaxInt64 // all of it: the address starts again
+	}
+	// The next apply writes the quota's new usage into the ruleset.
+	s.fw.AdjustQuota(adj)
+	if err := s.eng.ApplyCurrent(r.Context()); err != nil {
+		return fmt.Errorf("putting the ruleset in force with the quota's new usage: %w", err)
+	}
+	s.SaveQuotaUsage(r.Context())
+	detail, out := "", map[string]any{}
+	if in.Give > 0 {
+		detail = fmt.Sprintf("gave back %d bytes", in.Give)
+		out["given"] = in.Give
+	}
+	if in.Address != "" {
+		detail = strings.TrimSpace(detail + " " + in.Address)
+		out["address"] = in.Address
+	}
+	action := "quota.reset"
+	if in.Give > 0 {
+		action = "quota.give"
+	}
+	s.eng.Audit(r.Context(), p, action, rule.Label(), "success", detail)
+	out["reset"] = rule.Label()
+	writeJSON(w, http.StatusOK, out)
 	return nil
 }
+
+// quotaKey is the entry of a per-address quota an address counts under:
+// the address, or its group's first address (10.0.10.0 for a /24; an
+// IPv6 address's /64).
+func quotaKey(rule *model.Rule, s string) (string, error) {
+	var a netip.Addr
+	if p, err := netip.ParsePrefix(s); err == nil {
+		a = p.Addr()
+	} else if a, err = netip.ParseAddr(s); err != nil {
+		return "", badRequest("%q isn't an address", s)
+	}
+	a = a.Unmap()
+	v4, v6 := rule.Groups()
+	bits := v4
+	if a.Is6() {
+		bits = v6
+	}
+	p, err := a.Prefix(bits)
+	if err != nil {
+		return "", badRequest("%q: %v", s, err)
+	}
+	return p.Addr().String(), nil
+}
+
+// quotaHas reports whether a per-address quota has an entry for key.
+func (s *Server) quotaHas(ctx context.Context, name, key string) bool {
+	t, err := s.fw.Table(ctx)
+	if err != nil {
+		return false
+	}
+	for _, set := range []string{name + "_v4", name + "_v6"} {
+		for _, e := range t.QuotaSets[set] {
+			if e.Addr == key {
+				return true
+			}
+		}
+	}
+	return false
+}

internal/server/routes.go

@@ -38,9 +38,17 @@ func (s *Server) routes() {
 	m.HandleFunc("GET "+p+"/sets/{ref}/elements", s.authed(s.listElements))
 	m.HandleFunc("POST "+p+"/sets/{ref}/elements", s.authed(s.addElement))
 	m.HandleFunc("DELETE "+p+"/sets/{ref}/elements/{addr}", s.authed(s.deleteElement))
+	m.HandleFunc("GET "+p+"/sets/{ref}/jarl", s.authed(s.jarlStatus))
+	m.HandleFunc("POST "+p+"/sets/{ref}/jarl/refresh", s.authed(s.jarlRefresh))
+	m.HandleFunc("GET "+p+"/bans", s.authed(s.listBans))
+	m.HandleFunc("GET "+p+"/banlists/{ref}/bans", s.authed(s.listBans))
+	m.HandleFunc("POST "+p+"/banlists/{ref}/bans", s.authed(s.addBan))
+	m.HandleFunc("DELETE "+p+"/banlists/{ref}/bans", s.authed(s.deleteBans))
+	m.HandleFunc("DELETE "+p+"/banlists/{ref}/bans/{id}", s.authed(s.deleteBans))
 	m.HandleFunc("GET "+p+"/quotas", s.authed(s.listQuotas))
 	m.HandleFunc("GET "+p+"/connections", s.authed(s.listConnections))
 	m.HandleFunc("POST "+p+"/connections/close", s.authed(s.closeConnections))
+	m.HandleFunc("POST "+p+"/names", s.authed(s.lookupNames))
 	m.HandleFunc("GET "+p+"/trace", s.authed(s.getTrace))
 	m.HandleFunc("POST "+p+"/trace", s.authed(s.startTrace))
 	m.HandleFunc("DELETE "+p+"/trace", s.authed(s.stopTrace))
@@ -69,6 +77,7 @@ func (s *Server) routes() {
 	m.HandleFunc("GET "+p+"/stats/heatmap", s.authed(s.statsHeatmap))
 	m.HandleFunc("GET "+p+"/history", s.authed(s.listHistory))
 	m.HandleFunc("GET "+p+"/history/{id}", s.authed(s.getHistory))
+	m.HandleFunc("GET "+p+"/history/{id}/diff", s.authed(s.historyDiff))
 	m.HandleFunc("POST "+p+"/history/{id}/revert", s.authed(s.revertHistory))
 	m.HandleFunc("GET "+p+"/probation", s.authed(s.getProbation))
 	m.HandleFunc("POST "+p+"/confirm", s.authed(s.confirmChanges))

internal/server/server.go

@@ -22,7 +22,9 @@ import (
 	"housecarl/internal/auth"
 	"housecarl/internal/certs"
 	"housecarl/internal/engine"
+	"housecarl/internal/jarlsets"
 	"housecarl/internal/model"
+	"housecarl/internal/names"
 	"housecarl/internal/nft"
 	"housecarl/internal/render"
 	"housecarl/internal/stats"
@@ -51,6 +53,10 @@ type Config struct {
 	// after or before, for the status.
 	Shadow         bool
 	ShadowPosition string
+	// Names looks up inside addresses' names (nil: names are off).
+	Names *names.Resolver
+	// JarlSets fills the sets whose addresses come from Jarl (nil: none).
+	JarlSets *jarlsets.Resolver
 }
 
 // Interfaces lists the host's interfaces with their addresses, and
@@ -69,6 +75,8 @@ type Firewall interface {
 	Table(ctx context.Context) (*nft.Table, error)
 	AddElement(ctx context.Context, set, addr string, timeout int) error
 	DeleteElement(ctx context.Context, set, addr string) error
+	AddBan(ctx context.Context, b render.Ban) error
+	DeleteBan(ctx context.Context, b render.Ban) error
 	ListRuleset(ctx context.Context) ([]byte, error)
 	DeleteTable(ctx context.Context, family, name string) error
 	TableText(ctx context.Context, family, name string) (string, error)
@@ -76,6 +84,8 @@ type Firewall interface {
 	SaveBoot(st *model.State) error
 	// ResetQuota starts a rule's quota again (perAddress: its sets).
 	ResetQuota(ctx context.Context, ruleID int64, perAddress bool) error
+	// AdjustQuota has the next apply change what a quota used.
+	AdjustQuota(a nft.QuotaAdjust)
 	// Trace follows packets (internal/trace) until ctx ends.
 	Trace(ctx context.Context, script string, line func(string)) error
 }
@@ -136,6 +146,20 @@ func New(cfg Config, eng *engine.Engine, fw Firewall, ifaces Interfaces, log *sl
 	s := &Server{cfg: cfg, eng: eng, fw: fw, ifaces: ifaces, store: eng.Store(), log: log, mux: http.NewServeMux(), limiter: newRateLimiter(),
 		web: web, started: time.Now(), logs: newLogRing(2000), nowFn: time.Now, unitLinks: nftablesUnitLinks}
 	s.routes()
+	// What the quotas used is saved after every change too, not only every
+	// five minutes: a change that counts a quota differently converts its
+	// usage, and a restart must not bring back the old kind.
+	prev := eng.OnChange
+	eng.OnChange = func(st *model.State) {
+		if prev != nil {
+			prev(st)
+		}
+		s.SaveQuotaUsage(context.Background())
+		s.pruneBans(context.Background(), st) // the engine is locked: not s.eng.State()
+		if cfg.JarlSets != nil {
+			cfg.JarlSets.Kick() // a new name: read it now
+		}
+	}
 	return s
 }
 
@@ -309,6 +333,7 @@ func (s *Server) housekeeping(ctx context.Context) {
 				s.log.Warn("purging sessions failed", "err", err)
 			}
 			s.limiter.cleanup()
+			s.pruneBans(ctx, s.eng.State())
 			if s.certs != nil {
 				s.certs.reloadIfChanged()
 			}

internal/server/server_test.go

@@ -7,11 +7,13 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math"
 	"net/http"
 	"net/http/cookiejar"
 	"net/http/httptest"
 	"net/netip"
 	"os"
+	"reflect"
 	"strings"
 	"sync"
 	"testing"
@@ -21,6 +23,7 @@ import (
 	"housecarl/internal/auth"
 	"housecarl/internal/engine"
 	"housecarl/internal/model"
+	"housecarl/internal/names"
 	"housecarl/internal/nft"
 	"housecarl/internal/render"
 	"housecarl/internal/stats"
@@ -43,9 +46,27 @@ type fakeFW struct {
 	fallback   bool // the boot fallback is in force
 	shadow     bool
 	ruleset    string // nft -j list ruleset ("": a default)
+	quotas     nft.QuotaUsage
+	adjusted   []nft.QuotaAdjust
+	bans       map[string]render.Ban // by element (set and key)
 }
 
 func (f *fakeFW) Check(_ context.Context, st *model.State) error { return nil }
+func (f *fakeFW) AddBan(_ context.Context, b render.Ban) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if f.bans == nil {
+		f.bans = map[string]render.Ban{}
+	}
+	f.bans[render.BanSet(b.List, b.Addr.Addr().Is6(), b.Proto != "")+" "+render.BanElement(b)] = b
+	return nil
+}
+func (f *fakeFW) DeleteBan(_ context.Context, b render.Ban) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	delete(f.bans, render.BanSet(b.List, b.Addr.Addr().Is6(), b.Proto != "")+" "+render.BanElement(b))
+	return nil
+}
 func (f *fakeFW) Apply(_ context.Context, st *model.State) error {
 	f.mu.Lock()
 	defer f.mu.Unlock()
@@ -72,7 +93,12 @@ func (f *fakeFW) Table(context.Context) (*nft.Table, error) {
 	if len(f.applied) == 0 {
 		return nil, errors.New("No such file or directory: list table inet housecarl")
 	}
-	return &nft.Table{Counters: map[string]nft.Counter{"r1": {Packets: 3, Bytes: 180}}, Elements: f.elements, Fallback: f.fallback}, nil
+	return &nft.Table{Counters: map[string]nft.Counter{"r1": {Packets: 3, Bytes: 180}}, Elements: f.elements, Fallback: f.fallback, QuotaUsage: f.quotas}, nil
+}
+func (f *fakeFW) AdjustQuota(a nft.QuotaAdjust) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.adjusted = append(f.adjusted, a)
 }
 func (f *fakeFW) AddElement(_ context.Context, set, addr string, timeout int) error {
 	f.mu.Lock()
@@ -748,9 +774,53 @@ func TestQuotaResets(t *testing.T) {
 	if len(qs) != 1 || qs[0].NextReset == nil || qs[0].NextReset.Day() != 21 {
 		t.Errorf("quotas %+v", qs)
 	}
-	if code := e.call(e.token, "POST", "/rules/"+itoa(created.ID)+"/reset-quota", nil, nil); code != 200 || len(e.fw.resets) != 2 {
+	reset := "/rules/" + itoa(created.ID) + "/reset-quota"
+	if code := e.call(e.token, "POST", reset, nil, nil); code != 200 || len(e.fw.resets) != 2 {
 		t.Errorf("reset by hand: %d %v", code, e.fw.resets)
 	}
+
+	// One address started again, or some given back: the next apply
+	// (made at once) writes the new usage.
+	name := render.QuotaName(created.ID)
+	e.fw.quotas = nft.QuotaUsage{QuotaSets: map[string][]render.Element{name + "_v4": {{Addr: "10.0.10.23", Used: 6 << 30}},
+		name + "_v6": {{Addr: "2001:db8:1:2::", Used: 1 << 30}}}}
+	applies := len(e.fw.applied)
+	if code := e.call(e.token, "POST", reset, api.QuotaReset{Address: "10.0.10.23"}, nil); code != 200 {
+		t.Errorf("reset one address: %d", code)
+	}
+	if code := e.call(e.token, "POST", reset, api.QuotaReset{Address: "2001:db8:1:2:aaaa::7", Give: 2 << 30}, nil); code != 200 {
+		t.Errorf("give back to an IPv6 address (its /64): %d", code)
+	}
+	if code := e.call(e.token, "POST", reset, api.QuotaReset{Give: 1 << 30}, nil); code != 200 {
+		t.Errorf("give back to everyone: %d", code)
+	}
+	want3 := []nft.QuotaAdjust{{Name: name, Addr: "10.0.10.23", Give: math.MaxInt64}, {Name: name, Addr: "2001:db8:1:2::", Give: 2 << 30}, {Name: name, Give: 1 << 30}}
+	if !reflect.DeepEqual(e.fw.adjusted, want3) || len(e.fw.applied) != applies+3 || len(e.fw.resets) != 2 {
+		t.Errorf("adjusted %+v, applied %d more, resets %v", e.fw.adjusted, len(e.fw.applied)-applies, e.fw.resets)
+	}
+	for _, c := range []struct {
+		in   api.QuotaReset
+		code int
+	}{{api.QuotaReset{Address: "10.0.10.99"}, 404}, {api.QuotaReset{Address: "nonsense"}, 400}, {api.QuotaReset{Give: -5}, 400}} {
+		if code := e.call(e.token, "POST", reset, c.in, nil); code != c.code {
+			t.Errorf("%+v: %d, want %d", c.in, code, c.code)
+		}
+	}
+}
+
+// TestQuotaUsageSavedOnChange: a change saves what the quotas used at
+// once (a restart must not bring back usage counted the old way).
+func TestQuotaUsageSavedOnChange(t *testing.T) {
+	e := newEnv(t)
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "lan", Interfaces: []string{"eth1"}}, nil)
+	e.fw.mu.Lock()
+	e.fw.quotas = nft.QuotaUsage{Quotas: map[string]int64{"quota_r7": 4242}}
+	e.fw.mu.Unlock()
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "dmz", Interfaces: []string{"eth2"}}, nil)
+	v, err := e.eng.Store().GetMeta(context.Background(), QuotaUsageKey)
+	if err != nil || !strings.Contains(v, `"quota_r7":4242`) {
+		t.Errorf("saved usage %q %v", v, err)
+	}
 }
 
 // TestAutoConfirm: the client that made a change confirms it by itself:
@@ -891,6 +961,13 @@ func TestMatrixEndpoint(t *testing.T) {
 	if c := cell("lan", "wan"); c.Verdict != "allowed" {
 		t.Errorf("lan → wan with the changeset: %+v", c)
 	}
+	// Hits: summed over an object's counters; none without a counter.
+	hm := api.Matrix{Cells: []api.MatrixCell{{Marks: []string{"p-forward"}, Exceptions: []api.MatrixException{
+		{Marks: []string{"b-antispoof", "b-antispoof6"}}, {Marks: []string{"r9"}}}}}}
+	matrixHits(&hm, map[string]nft.Counter{"p-forward": {Packets: 4}, "b-antispoof": {Packets: 2}, "b-antispoof6": {Packets: 3}})
+	if c := hm.Cells[0]; c.Hits == nil || *c.Hits != 4 || c.Exceptions[0].Hits == nil || *c.Exceptions[0].Hits != 5 || c.Exceptions[1].Hits != nil {
+		t.Errorf("hits: %+v", c)
+	}
 }
 
 // TestHostProblems: an enabled nftables.service, and an imported table
@@ -975,6 +1052,41 @@ func TestConnections(t *testing.T) {
 	}
 }
 
+// TestNames: names only for inside addresses (an inside zone's network,
+// or private outside the external zones'), under the address as asked.
+func TestNames(t *testing.T) {
+	var asked []string
+	var mu sync.Mutex
+	e := newEnvWith(t, Config{Names: names.NewFunc(func(_ context.Context, a string) ([]string, error) {
+		mu.Lock()
+		asked = append(asked, a)
+		mu.Unlock()
+		return []string{"host-" + strings.ReplaceAll(a, ".", "-") + ".example.net."}, nil
+	}, time.Hour)})
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "wan", Interfaces: []string{"wan"}, External: true}, nil)
+	e.call(e.token, "POST", "/zones", model.Zone{Name: "lan", Interfaces: []string{"eth1"}}, nil)
+	var out api.Names
+	e.call(e.token, "POST", "/names", api.NamesInput{Addresses: []string{"10.0.10.5", "::ffff:10.0.10.5", "192.168.7.7", "217.155.8.194", "8.8.8.8", "fe80::1", "nonsense"}}, &out)
+	want := map[string]string{"10.0.10.5": "host-10-0-10-5.example.net", "::ffff:10.0.10.5": "host-10-0-10-5.example.net", "192.168.7.7": "host-192-168-7-7.example.net"}
+	if !out.Enabled || !reflect.DeepEqual(out.Names, want) {
+		t.Errorf("names: %+v", out)
+	}
+	if len(asked) != 2 {
+		t.Errorf("looked up %v, want the two inside addresses once each", asked)
+	}
+	var tok api.Token
+	e.call(e.token, "POST", "/me/tokens", api.TokenInput{Name: "monitor", Role: "log"}, &tok)
+	var one, none api.Names
+	if code := e.call(tok.Secret, "POST", "/names", api.NamesInput{Addresses: []string{"10.0.10.5"}}, &one); code != 200 || len(one.Names) != 1 {
+		t.Errorf("with log:read: %d %+v", code, one)
+	}
+	off := newEnv(t)
+	off.call(off.token, "POST", "/names", api.NamesInput{Addresses: []string{"10.0.10.5"}}, &none)
+	if none.Enabled || len(none.Names) != 0 {
+		t.Errorf("names off: %+v", none)
+	}
+}
+
 // TestTrace: a trace runs with the filter's table, collects packets named
 // after Housecarl's objects, and stops when asked; one at a time.
 func TestTrace(t *testing.T) {
@@ -1177,3 +1289,76 @@ func (e *env) text(path string) string {
 	b, _ := io.ReadAll(resp.Body)
 	return string(b)
 }
+
+// TestCreatePlaced: a rule created ?before= another is placed in the same
+// change (one history entry), also when staged in a changeset.
+func TestCreatePlaced(t *testing.T) {
+	e := newEnv(t)
+	var a, b, c api.MutationResponse
+	e.call(e.token, "POST", "/rules", model.Rule{Chain: "input", Match: model.Match{Services: []string{"ssh"}}}, &a)
+	e.call(e.token, "POST", "/rules", model.Rule{Chain: "input", Match: model.Match{Services: []string{"dns"}}}, &b)
+	var first model.Rule
+	json.Unmarshal(a.Object, &first)
+	if code := e.call(e.token, "POST", "/rules?before="+itoa(first.ID), model.Rule{Chain: "input", Match: model.Match{Services: []string{"http"}}, Comment: "placed"}, &c); code != 201 {
+		t.Fatalf("create placed: %d %+v", code, c)
+	}
+	order := func() string {
+		var out []string
+		for _, r := range e.eng.State().Rules {
+			out = append(out, strings.Join(r.Services, ""))
+		}
+		return strings.Join(out, ",")
+	}
+	if o := order(); o != "http,ssh,dns" {
+		t.Errorf("order: %s", o)
+	}
+	var hs []model.HistoryEntry
+	e.call(e.token, "GET", "/history", nil, &hs)
+	if len(hs) != 3 || len(hs[0].Changes) != 1 || hs[0].Changes[0].Action() != "create" {
+		t.Errorf("history: %d entries, newest %+v", len(hs), hs[0])
+	}
+	// Staged, the place goes with it.
+	var cs model.Changeset
+	e.call(e.token, "POST", "/changesets", nil, &cs)
+	e.call(e.token, "POST", "/rules?first=1&changeset="+itoa(cs.ID), model.Rule{Chain: "input", Match: model.Match{Services: []string{"ntp"}}}, nil)
+	if code := e.call(e.token, "POST", "/changesets/"+itoa(cs.ID)+"/apply", nil, nil); code != 200 {
+		t.Fatalf("apply: %d", code)
+	}
+	if o := order(); o != "ntp,http,ssh,dns" {
+		t.Errorf("order after the changeset: %s", o)
+	}
+	// A bad place: refused, nothing created.
+	if code := e.call(e.token, "POST", "/rules?before=99999", model.Rule{Chain: "input"}, nil); code != 400 {
+		t.Errorf("before a rule that isn't there: %d", code)
+	}
+	if n := len(e.eng.State().Rules); n != 4 {
+		t.Errorf("%d rules", n)
+	}
+}
+
+// TestTokenForUser: an administrator makes a token for another user (the
+// web UI's New token on a user's row); that user can't make one for
+// someone else.
+func TestTokenForUser(t *testing.T) {
+	e := newEnv(t)
+	var u api.User
+	if code := e.call(e.token, "POST", "/users", api.UserInput{Username: ptr("portal"), Grants: &[]string{"sets:write"}}, &u); code != 201 {
+		t.Fatalf("user: %d", code)
+	}
+	var tok api.Token
+	if code := e.call(e.token, "POST", "/users/"+itoa(u.ID)+"/tokens", api.TokenInput{Name: "portal", ExpiresIn: "30d"}, &tok); code != 201 || tok.Secret == "" || tok.UserID != u.ID {
+		t.Fatalf("token for portal: %d %+v", code, tok)
+	}
+	if code := e.call(tok.Secret, "GET", "/rules", nil, nil); code != 403 {
+		t.Errorf("the token can do more than its user: %d", code)
+	}
+	var users []api.User
+	e.call(e.token, "GET", "/users", nil, &users)
+	for _, o := range users {
+		if o.ID != u.ID {
+			if code := e.call(tok.Secret, "POST", "/users/"+itoa(o.ID)+"/tokens", api.TokenInput{Name: "x"}, nil); code != 403 {
+				t.Errorf("a token for another user, made by a non-administrator: %d", code)
+			}
+		}
+	}
+}

internal/stats/collector.go

@@ -402,7 +402,10 @@ func (c *Collector) sample(ctx context.Context, minute int64) map[string]int64 {
 			for set, es := range t.QuotaSets {
 				kind := strings.TrimSuffix(strings.TrimSuffix(set, "_v4"), "_v6")
 				for _, e := range es {
-					addTop(kind, e.Addr, c.table.of(set+"/"+e.Addr, e.Used))
+					d := c.table.of(set+"/"+e.Addr, e.Used)
+					addTop(kind, e.Addr, d)
+					// A per-address quota's series is its addresses' sum.
+					add("quota:"+strings.TrimPrefix(kind, "quota_"), d)
 				}
 			}
 			for set, es := range t.DeviceSets {

internal/stats/collector_test.go

@@ -85,6 +85,10 @@ func TestCollector(t *testing.T) {
 	h.table.Counters["r1"] = nft.Counter{Packets: 10, Bytes: 1000}
 	h.table.Counters["r2"] = nft.Counter{Packets: 100, Bytes: 9000}
 	h.table.Quotas["quota_r5"] = 1 << 20
+	if h.table.QuotaSets == nil {
+		h.table.QuotaSets = map[string][]render.Element{}
+	}
+	h.table.QuotaSets["quota_r6_v4"] = []render.Element{{Addr: "10.0.10.5", Used: 1000}}
 	h.table.DeviceSets["stats_up_v4"] = []render.Element{{Addr: "10.0.10.5", Bytes: 5000}}
 
 	store, err := OpenStore(":memory:")
@@ -104,6 +108,7 @@ func TestCollector(t *testing.T) {
 	h.table.Counters["r1"] = nft.Counter{Packets: 25, Bytes: 2500}
 	h.table.Counters["p-input"] = nft.Counter{Packets: 3, Bytes: 180} // a new counter counts whole
 	h.table.Quotas["quota_r5"] = 3 << 20
+	h.table.QuotaSets["quota_r6_v4"] = []render.Element{{Addr: "10.0.10.5", Used: 2000}, {Addr: "10.0.10.6", Used: 500}} // a new entry counts whole
 	h.table.DeviceSets["stats_up_v4"] = []render.Element{{Addr: "10.0.10.5", Bytes: 8000}}
 	h.table.DeviceSets["stats_down_v6"] = []render.Element{{Addr: "2001:db8:1:2::", Bytes: 70000}}
 	for range 2 {
@@ -142,6 +147,7 @@ func TestCollector(t *testing.T) {
 	check("drop:forward", sum("drop:")["forward"], 15)
 	check("drop:input", sum("drop:")["input"], 3)
 	check("quota:r5", sum("quota:")["r5"], 2<<20)
+	check("quota:r6 (per address: the sum)", sum("quota:")["r6"], 1500)
 
 	s, err := q.Summary(ctx, time.Hour, 10)
 	if err != nil {

internal/store/bans.go

@@ -0,0 +1,135 @@
+package store
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"time"
+
+	"housecarl/internal/model"
+)
+
+const banCols = `id, list_id, address, protocol, port, expires_at, created_at, who, source, reason`
+
+func scanBan(sc interface{ Scan(...any) error }, now time.Time) (*model.Ban, error) {
+	b := &model.Ban{}
+	var expires sql.NullString
+	var created string
+	if err := sc.Scan(&b.ID, &b.ListID, &b.Address, &b.Protocol, &b.Port, &expires, &created, &b.Who, &b.Source, &b.Reason); err != nil {
+		return nil, err
+	}
+	b.Created = parseTS(created)
+	b.Expires = parseTSPtr(expires)
+	if b.Expires != nil {
+		b.Timeout = max(int(b.Expires.Sub(now).Round(time.Second)/time.Second), 1)
+	}
+	return b, nil
+}
+
+// PutBan saves a ban, or renews the same ban (list, address, protocol
+// and port) with its new end, who and why (an empty source or reason
+// keeps the old). existing tells which; b gets
+// its ID either way.
+func (s *Store) PutBan(ctx context.Context, b *model.Ban) (existing bool, err error) {
+	now := time.Now()
+	err = s.db.QueryRowContext(ctx, `SELECT id FROM bans WHERE list_id = ? AND address = ? AND protocol = ? AND port = ?
+		AND (expires_at IS NULL OR expires_at > ?)`, b.ListID, b.Address, b.Protocol, b.Port, ts(now)).Scan(&b.ID)
+	existing = err == nil
+	if err != nil && !errors.Is(err, sql.ErrNoRows) {
+		return false, err
+	}
+	b.Created = now
+	err = s.db.QueryRowContext(ctx, `INSERT INTO bans (list_id, address, protocol, port, expires_at, created_at, who, source, reason)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+		ON CONFLICT (list_id, address, protocol, port) DO UPDATE SET expires_at = excluded.expires_at,
+			who = excluded.who, source = COALESCE(NULLIF(excluded.source, ''), bans.source),
+			reason = COALESCE(NULLIF(excluded.reason, ''), bans.reason),
+			created_at = CASE WHEN bans.expires_at IS NULL OR bans.expires_at > excluded.created_at THEN bans.created_at ELSE excluded.created_at END
+		RETURNING id, created_at`,
+		b.ListID, b.Address, b.Protocol, b.Port, tsPtr(b.Expires), ts(now), b.Who, b.Source, b.Reason).Scan(&b.ID, new(string))
+	return existing, err
+}
+
+// ListBans lists the active bans of a list (0: of all lists), oldest
+// first.
+func (s *Store) ListBans(ctx context.Context, listID int64) ([]*model.Ban, error) {
+	now := time.Now()
+	q := `SELECT ` + banCols + ` FROM bans WHERE (expires_at IS NULL OR expires_at > ?)`
+	args := []any{ts(now)}
+	if listID != 0 {
+		q += ` AND list_id = ?`
+		args = append(args, listID)
+	}
+	rows, err := s.db.QueryContext(ctx, q+` ORDER BY id`, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := []*model.Ban{}
+	for rows.Next() {
+		b, err := scanBan(rows, now)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, b)
+	}
+	return out, rows.Err()
+}
+
+// GetBan loads an active ban.
+func (s *Store) GetBan(ctx context.Context, id int64) (*model.Ban, error) {
+	now := time.Now()
+	b, err := scanBan(s.db.QueryRowContext(ctx, `SELECT `+banCols+` FROM bans WHERE id = ? AND (expires_at IS NULL OR expires_at > ?)`, id, ts(now)), now)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrNotFound
+	}
+	return b, err
+}
+
+// DeleteBan removes a ban.
+func (s *Store) DeleteBan(ctx context.Context, id int64) error {
+	_, err := s.db.ExecContext(ctx, `DELETE FROM bans WHERE id = ?`, id)
+	return err
+}
+
+// CountBans counts a list's active bans.
+func (s *Store) CountBans(ctx context.Context, listID int64) (int, error) {
+	var n int
+	err := s.db.QueryRowContext(ctx, `SELECT COUNT(*) FROM bans WHERE list_id = ? AND (expires_at IS NULL OR expires_at > ?)`, listID, ts(time.Now())).Scan(&n)
+	return n, err
+}
+
+// PruneBans deletes the bans that ended, and those of lists that no
+// longer exist (lists names the ones that do).
+func (s *Store) PruneBans(ctx context.Context, lists []int64) (int64, error) {
+	res, err := s.db.ExecContext(ctx, `DELETE FROM bans WHERE expires_at <= ?`, ts(time.Now()))
+	if err != nil {
+		return 0, err
+	}
+	n, _ := res.RowsAffected()
+	rows, err := s.db.QueryContext(ctx, `SELECT DISTINCT list_id FROM bans`)
+	if err != nil {
+		return n, err
+	}
+	var gone []int64
+	keep := map[int64]bool{}
+	for _, id := range lists {
+		keep[id] = true
+	}
+	for rows.Next() {
+		var id int64
+		if rows.Scan(&id) == nil && !keep[id] {
+			gone = append(gone, id)
+		}
+	}
+	rows.Close()
+	for _, id := range gone {
+		res, err := s.db.ExecContext(ctx, `DELETE FROM bans WHERE list_id = ?`, id)
+		if err != nil {
+			return n, err
+		}
+		m, _ := res.RowsAffected()
+		n += m
+	}
+	return n, nil
+}

internal/store/history.go

@@ -63,3 +63,21 @@ func (s *Store) GetHistory(ctx context.Context, id int64) (*model.HistoryEntry,
 	}
 	return e, err
 }
+
+// HistorySince lists the entries from id on, newest first.
+func (s *Store) HistorySince(ctx context.Context, id int64) ([]*model.HistoryEntry, error) {
+	rows, err := s.db.QueryContext(ctx, `SELECT `+historyCols+` FROM history WHERE id >= ? ORDER BY id DESC`, id)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []*model.HistoryEntry
+	for rows.Next() {
+		e, err := scanHistory(rows)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, e)
+	}
+	return out, rows.Err()
+}

internal/store/store.go

@@ -179,6 +179,23 @@ CREATE TABLE changesets (
 	history_id INTEGER
 );
 CREATE INDEX changesets_status ON changesets (status);
+`,
+	// 3: ban lists' bans (the lists are objects)
+	`
+CREATE TABLE bans (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	list_id INTEGER NOT NULL,
+	address TEXT NOT NULL,
+	protocol TEXT NOT NULL DEFAULT '',
+	port INTEGER NOT NULL DEFAULT 0,
+	expires_at TEXT,
+	created_at TEXT NOT NULL,
+	who TEXT NOT NULL DEFAULT '',
+	source TEXT NOT NULL DEFAULT '',
+	reason TEXT NOT NULL DEFAULT '',
+	UNIQUE (list_id, address, protocol, port)
+);
+CREATE INDEX bans_expires ON bans (expires_at);
 `,
 }
 

internal/store/store_test.go

@@ -103,3 +103,60 @@ func TestUsersAndAudit(t *testing.T) {
 		t.Errorf("audit %+v", evs)
 	}
 }
+
+func TestBans(t *testing.T) {
+	ctx := context.Background()
+	s, err := Open(filepath.Join(t.TempDir(), "housecarl.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer s.Close()
+	in := func(d time.Duration) *time.Time { t := time.Now().Add(d); return &t }
+	b := &model.Ban{ListID: 7, Address: "203.0.113.9", Expires: in(time.Hour), Who: "guard", Source: "guard/ssh"}
+	if existing, err := s.PutBan(ctx, b); err != nil || existing {
+		t.Fatalf("new ban: %v %v", existing, err)
+	}
+	id := b.ID
+	again := &model.Ban{ListID: 7, Address: "203.0.113.9", Expires: in(2 * time.Hour), Who: "guard", Reason: "again"}
+	if existing, err := s.PutBan(ctx, again); err != nil || !existing || again.ID != id {
+		t.Fatalf("renewed ban: %v %v id %d, want %d", existing, err, again.ID, id)
+	}
+	port := &model.Ban{ListID: 7, Address: "2001:db8:1:2::/64", Protocol: "tcp", Port: 22}
+	if _, err := s.PutBan(ctx, port); err != nil {
+		t.Fatal(err)
+	}
+	gone := &model.Ban{ListID: 7, Address: "198.51.100.1", Expires: in(-time.Second)}
+	if _, err := s.PutBan(ctx, gone); err != nil {
+		t.Fatal(err)
+	}
+	other := &model.Ban{ListID: 8, Address: "198.51.100.2"}
+	if _, err := s.PutBan(ctx, other); err != nil {
+		t.Fatal(err)
+	}
+	list, err := s.ListBans(ctx, 7)
+	if err != nil || len(list) != 2 {
+		t.Fatalf("list 7: %v %+v", err, list)
+	}
+	if list[0].Reason != "again" || list[0].Timeout < 7100 || list[0].Timeout > 7200 || list[1].Expires != nil || list[1].Timeout != 0 {
+		t.Errorf("bans: %+v %+v", list[0], list[1])
+	}
+	if n, _ := s.CountBans(ctx, 7); n != 2 {
+		t.Errorf("count %d", n)
+	}
+	// An ended ban is renewed as new.
+	if existing, _ := s.PutBan(ctx, &model.Ban{ListID: 7, Address: "198.51.100.1", Expires: in(time.Minute)}); existing {
+		t.Error("an ended ban counted as existing")
+	}
+	if n, err := s.PruneBans(ctx, []int64{7}); err != nil || n != 1 {
+		t.Errorf("prune: %d %v (list 8's ban)", n, err)
+	}
+	if all, _ := s.ListBans(ctx, 0); len(all) != 3 {
+		t.Errorf("after pruning: %+v", all)
+	}
+	if err := s.DeleteBan(ctx, id); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.GetBan(ctx, id); !errors.Is(err, ErrNotFound) {
+		t.Errorf("deleted ban: %v", err)
+	}
+}

internal/validate/validate.go

@@ -82,6 +82,7 @@ func Check(st *model.State, env *Env) []Problem {
 	for _, x := range st.Redirects {
 		c.redirect(x)
 	}
+	c.banLists()
 	return c.out
 }
 
@@ -233,9 +234,9 @@ func (c *checker) sets() {
 	for _, s := range c.st.Sets {
 		obj := "set " + s.Name
 		c.name("set", obj, s.Name, seen)
-		for _, pre := range []string{"meter_", "conn_", "quota_", "stats_"} {
+		for _, pre := range []string{"meter_", "conn_", "quota_", "stats_", "ban_"} {
 			if strings.HasPrefix(strings.ToLower(s.Name), pre) {
-				c.add(Error, "set_name_reserved", obj, "set names starting with %s are Housecarl's own (rate limits, quotas, statistics); choose another name", pre)
+				c.add(Error, "set_name_reserved", obj, "set names starting with %s are Housecarl's own (rate limits, quotas, statistics, ban lists); choose another name", pre)
 			}
 		}
 		for _, e := range s.Entries {
@@ -246,15 +247,79 @@ func (c *checker) sets() {
 		if len(s.Entries) > 0 && s.Dynamic {
 			c.add(Error, "set_dynamic_entries", obj, "a dynamic set gets its entries at run time (hc set entries add, the Entries button), each with its timeout; leave out the configured ones, or make it a set that isn't dynamic")
 		}
-		if len(s.Entries) == 0 && !s.Dynamic {
+		if len(s.Entries) == 0 && !s.Runtime() {
 			c.add(Warning, "set_empty", obj, "the set is empty: rules using it match nothing")
 		}
+		if s.Jarl != nil {
+			c.jarlSet(obj, s)
+		}
 		if s.Timeout < 0 || s.Timeout > 0 && !s.Dynamic {
 			c.add(Error, "set_timeout", obj, "only a dynamic set has a timeout, of 1 second or more")
 		}
 	}
 }
 
+// dnsLabel is one label of a name in Jarl (underscores allowed, as in
+// _service names).
+var dnsLabel = regexp.MustCompile(`^[a-z0-9_]([a-z0-9_-]{0,61}[a-z0-9_])?$`)
+
+// jarlSet checks a set whose entries come from Jarl.
+func (c *checker) jarlSet(obj string, s *model.AddressSet) {
+	j := s.Jarl
+	if len(s.Entries) > 0 {
+		c.add(Error, "set_jarl_entries", obj, "a Jarl set's entries are the addresses of its names in Jarl; leave out the configured ones, or make it a set that doesn't come from Jarl")
+	}
+	if s.Dynamic {
+		c.add(Error, "set_jarl_dynamic", obj, "a set is dynamic or comes from Jarl, not both")
+	}
+	if len(j.Names) == 0 {
+		c.add(Error, "set_jarl_names", obj, "name at least one name in Jarl, such as nas.example.com (or nas.example.com@internal for one view)")
+	}
+	seen := map[string]bool{}
+	for _, n := range j.Names {
+		if !validDNSName(n.Name) {
+			c.add(Error, "set_jarl_names", obj, "%q isn't a DNS name; give the full name, such as nas.example.com (wildcards aren't followed)", n.Name)
+			continue
+		}
+		if strings.ContainsAny(n.View, " \t@") {
+			c.add(Error, "set_jarl_names", obj, "%q isn't a view name: write NAME@VIEW, such as nas.example.com@internal", n.View)
+			continue
+		}
+		if seen[n.String()] {
+			c.add(Error, "set_jarl_names", obj, "%s is listed twice", n)
+		}
+		seen[n.String()] = true
+	}
+	if len(j.Within) == 0 {
+		c.add(Error, "set_jarl_within", obj, "say where its addresses may be (within): zones, whose connected networks count, or networks such as 10.10.0.0/24; an address from Jarl elsewhere is left out, so a changed record can't open the firewall to anything")
+	}
+	for _, w := range j.Within {
+		if a, err := model.ParseAddress(w); err == nil {
+			if a.Prefix.IsValid() && a.Prefix.Bits() == 0 && !a.First.IsValid() {
+				c.add(Warning, "set_jarl_anywhere", obj, "within %s lets any address in: whoever can change the names in Jarl decides what the set holds; name zones or networks instead", w)
+			}
+			continue
+		}
+		if c.st.Zone(w) == nil {
+			c.add(Error, "set_jarl_within", obj, "within %q: no such zone, and not an address or network", w)
+		}
+	}
+}
+
+// validDNSName reports whether n is a name a Jarl set can look up: LDH
+// labels (and underscores), no wildcard, without the final dot.
+func validDNSName(n string) bool {
+	if n == "" || len(n) > 253 {
+		return false
+	}
+	for _, l := range strings.Split(n, ".") {
+		if !dnsLabel.MatchString(l) {
+			return false
+		}
+	}
+	return true
+}
+
 func (c *checker) services() {
 	seen := map[string]string{}
 	for _, s := range c.st.Services {
@@ -612,3 +677,48 @@ func (c *checker) redirect(x *model.Redirect) {
 		}
 	}
 }
+
+func (c *checker) banLists() {
+	seen := map[string]string{}
+	for _, b := range c.st.BanLists {
+		obj := "ban list " + b.Name
+		c.name("banlist", obj, b.Name, seen)
+		known := false
+		for _, sc := range model.BanScopes {
+			known = known || b.Scope == sc
+		}
+		if !known {
+			c.add(Error, "banlist_scope", obj, "the scope is %q; use firewall (the firewall itself), hosts (the list's hosts) or everything", b.Scope)
+		}
+		switch {
+		case b.Scope == model.BanScopeHosts && len(b.Hosts) == 0:
+			c.add(Error, "banlist_hosts", obj, "a list with scope hosts needs its hosts: the addresses, or sets, of the machines it protects")
+		case b.Scope != model.BanScopeHosts && len(b.Hosts) > 0:
+			c.add(Error, "banlist_hosts", obj, "only a list with scope hosts has hosts; leave them out, or use scope hosts")
+		}
+		refs := func(what string, list []string) {
+			for _, r := range list {
+				if !model.IsLiteral(r) && c.st.Set(r) == nil {
+					if _, err := model.ParseAddress(r); strings.ContainsAny(r, "./:") {
+						c.add(Error, "banlist_address", obj, "%s: %v", what, err)
+					} else {
+						c.add(Error, "unknown_set", obj, "%s: there is no set %s", what, r)
+					}
+				}
+			}
+		}
+		refs("hosts", b.Hosts)
+		refs("never", b.Never)
+		if b.DefaultTime < 0 || b.MaxTime < -1 {
+			c.add(Error, "banlist_time", obj, "ban times are seconds: default_time 0 (an hour) or more, max_time 0 (a week), more, or -1 for no limit")
+		} else if max := b.BanMaxTime(); max > 0 && b.BanTime() > max {
+			c.add(Error, "banlist_time", obj, "the default ban time (%ds) is longer than the longest (%ds)", b.BanTime(), max)
+		}
+		if b.MaxEntries < 0 || b.MaxEntries > 1000000 {
+			c.add(Error, "banlist_entries", obj, "max_entries is %d; use 1 to 1000000, or 0 for 10000", b.MaxEntries)
+		}
+		if b.GroupV6 != 0 && (b.GroupV6 < 16 || b.GroupV6 > 128) {
+			c.add(Error, "banlist_group", obj, "group_v6 is /%d; use 16 to 128 (64 bans what one customer usually gets, 128 one address)", b.GroupV6)
+		}
+	}
+}

internal/validate/validate_test.go

@@ -24,7 +24,21 @@ func base() *model.State {
 		},
 		Forwards: []*model.PortForward{{ID: 7, Position: 1, Name: "jellyfin", Protocols: []string{"tcp"}, Ports: "8096", To: "10.0.10.57",
 			PublicAddresses: []string{"203.0.113.7"}, Hairpin: true}},
-		SNATs: []*model.SourceNAT{{ID: 8, Position: 1, Match: model.Match{OutZones: []string{"wan"}, Sources: []string{"trusted"}}}},
+		SNATs:    []*model.SourceNAT{{ID: 8, Position: 1, Match: model.Match{OutZones: []string{"wan"}, Sources: []string{"trusted"}}}},
+		BanLists: []*model.BanList{{ID: 9, Name: "web", Scope: model.BanScopeHosts, Hosts: []string{"10.0.10.57"}, Never: []string{"trusted"}}},
+	}
+}
+
+func jarlSource() *model.JarlSource {
+	return &model.JarlSource{Names: []model.JarlName{{Name: "nas.example.com", View: "internal"}}, Within: []string{"lan", "10.9.0.0/16"}}
+}
+
+func TestJarlSetValid(t *testing.T) {
+	st := base()
+	st.Sets[0].Entries, st.Sets[0].Jarl = nil, jarlSource()
+	st.Sets[0].Jarl.Names = append(st.Sets[0].Jarl.Names, model.JarlName{Name: "_svc.files.example.com"})
+	if ps := Check(st, nil); len(ps) > 0 {
+		t.Fatalf("problems: %+v", ps)
 	}
 }
 
@@ -76,6 +90,33 @@ func TestCodes(t *testing.T) {
 		}},
 		{"set_timeout", func(st *model.State) { st.Sets[0].Timeout = 60 }},
 		{"set_dynamic_entries", func(st *model.State) { st.Sets[0].Dynamic = true }},
+		{"set_jarl_entries", func(st *model.State) { st.Sets[0].Jarl = jarlSource() }},
+		{"set_jarl_dynamic", func(st *model.State) {
+			st.Sets[0].Entries, st.Sets[0].Dynamic, st.Sets[0].Jarl = nil, true, jarlSource()
+		}},
+		{"set_jarl_names", func(st *model.State) {
+			st.Sets[0].Entries, st.Sets[0].Jarl = nil, &model.JarlSource{Within: []string{"lan"}}
+		}},
+		{"set_jarl_names", func(st *model.State) {
+			st.Sets[0].Entries, st.Sets[0].Jarl = nil, jarlSource()
+			st.Sets[0].Jarl.Names[0].Name = "*.example.com"
+		}},
+		{"set_jarl_names", func(st *model.State) {
+			st.Sets[0].Entries, st.Sets[0].Jarl = nil, jarlSource()
+			st.Sets[0].Jarl.Names = append(st.Sets[0].Jarl.Names, st.Sets[0].Jarl.Names[0])
+		}},
+		{"set_jarl_within", func(st *model.State) {
+			st.Sets[0].Entries, st.Sets[0].Jarl = nil, jarlSource()
+			st.Sets[0].Jarl.Within = nil
+		}},
+		{"set_jarl_within", func(st *model.State) {
+			st.Sets[0].Entries, st.Sets[0].Jarl = nil, jarlSource()
+			st.Sets[0].Jarl.Within = []string{"dmz"}
+		}},
+		{"set_jarl_anywhere", func(st *model.State) {
+			st.Sets[0].Entries, st.Sets[0].Jarl = nil, jarlSource()
+			st.Sets[0].Jarl.Within = []string{"::/0"}
+		}},
 		{"service_empty", func(st *model.State) { st.Services[0].Entries = nil }},
 		{"service_entry", func(st *model.State) { st.Services[0].Entries = []string{"tcp/99999"} }},
 		{"unknown_zone", func(st *model.State) { st.Rules[1].InZones = []string{"dmz"} }},
@@ -136,6 +177,17 @@ func TestCodes(t *testing.T) {
 		{"redirect_service", func(st *model.State) {
 			st.Redirects = []*model.Redirect{{ID: 11, Position: 1, Match: model.Match{InZones: []string{"lan"}}}}
 		}},
+		{"banlist_name", func(st *model.State) { st.BanLists[0].Name = "web list" }},
+		{"banlist_scope", func(st *model.State) { st.BanLists[0].Scope = "world" }},
+		{"banlist_hosts", func(st *model.State) { st.BanLists[0].Hosts = nil }},
+		{"banlist_hosts", func(st *model.State) { st.BanLists[0].Scope = model.BanScopeFirewall }},
+		{"banlist_address", func(st *model.State) { st.BanLists[0].Never = []string{"10.0.0.300"} }},
+		{"unknown_set", func(st *model.State) { st.BanLists[0].Hosts = []string{"webservers"} }},
+		{"banlist_time", func(st *model.State) { st.BanLists[0].MaxTime = -2 }},
+		{"banlist_time", func(st *model.State) { st.BanLists[0].DefaultTime, st.BanLists[0].MaxTime = 7200, 3600 }},
+		{"banlist_entries", func(st *model.State) { st.BanLists[0].MaxEntries = -1 }},
+		{"banlist_group", func(st *model.State) { st.BanLists[0].GroupV6 = 8 }},
+		{"set_name_reserved", func(st *model.State) { st.Sets[0].Name = "ban_3" }},
 		{"redirect_to_port", func(st *model.State) {
 			st.Redirects = []*model.Redirect{{ID: 11, Position: 1, Match: model.Match{InZones: []string{"lan"}, Services: []string{"dns"}}, ToPort: "53-54"}}
 		}},

internal/web/static/assets/app.js

@@ -4,6 +4,7 @@ import { wordmark, logo } from "./brand.js";
 import { api, get, state, can, setUnauthorizedHandler, setChangeHandler, loadDraft, onDraftChange, setImmediate, useDraft } from "./api.js";
 import * as changes from "./pages/changes.js";
 import * as connections from "./pages/connections.js";
+import * as bans from "./pages/bans.js";
 import * as tracePage from "./pages/trace.js";
 import * as matrixPage from "./pages/matrix.js";
 import * as statsPage from "./pages/stats.js";
@@ -32,6 +33,7 @@ const routes = [
   { pattern: /^services$/, page: services, nav: "services" },
   { pattern: /^log$/, page: log, nav: "log" },
   { pattern: /^connections$/, page: connections, nav: "connections" },
+  { pattern: /^bans$/, page: bans, nav: "bans" },
   { pattern: /^trace$/, page: tracePage, nav: "trace" },
   { pattern: /^stats$/, page: statsPage, nav: "stats" },
   { pattern: /^settings$/, page: settings, nav: "settings" },
@@ -60,6 +62,7 @@ const navItems = [
     ["stats", "#/stats", "Statistics", "log"],
     ["log", "#/log", "Log", "log"],
     ["connections", "#/connections", "Connections", "log"],
+    ["bans", "#/bans", "Bans", "bans"],
     ["trace", "#/trace", "Trace", "log"],
   ] },
   ["changes", "#/changes", "Changes", "config"],

internal/web/static/assets/charts.js

@@ -331,7 +331,7 @@ export function heatmapTable(hm, unit) {
 // so the list is its own table view.
 // extra(key), when given, adds something after an entry's label (e.g. a
 // link that excludes it).
-export function barList(entries, { total, label = (k) => k, empty = "No data yet.", href, extra, format = compact } = {}) {
+export function barList(entries, { total, label = (k) => k, empty = "No data yet.", href, extra, format = compact, share: showShare = true } = {}) {
   if (!entries.length) return h("div", { class: "empty" }, empty);
   // Entries may be in a natural order (e.g. latency buckets), not by size.
   const peak = Math.max(1, ...entries.map((e) => e.count));
@@ -345,7 +345,7 @@ export function barList(entries, { total, label = (k) => k, empty = "No data yet
     return h("li", { title: (e.name ? e.name + " (" + name + ")" : name) + ": " + format(e.count) + " (" + share.toFixed(1) + "%)" },
       h("div", { class: "bar-text" },
         link ? h("a", { href: link, class: "bar-label" }, shown) : h("span", { class: "bar-label" }, shown),
-        h("span", { class: "bar-value" }, extra ? [extra(e.key), " "] : null, format(e.count), h("span", { class: "muted" }, " · " + share.toFixed(share < 10 ? 1 : 0) + "%"))),
+        h("span", { class: "bar-value" }, extra ? [extra(e.key), " "] : null, format(e.count), showShare ? h("span", { class: "muted" }, " · " + share.toFixed(share < 10 ? 1 : 0) + "%") : null)),
       h("div", { class: "bar-track" }, h("div", { class: "bar-fill", style: { width: Math.max(0.5, (e.count / peak) * 100) + "%" } })));
   }));
 }

internal/web/static/assets/pages/account.js

@@ -1,8 +1,8 @@
 // Your account: password and API tokens.
-import { h, mount, table, time, modal, input, field, select, errorBox, toast, copyBox } from "../ui.js";
-import { get, api, state, catalog, can } from "../api.js";
+import { h, mount, table, time, input, field, errorBox, toast } from "../ui.js";
+import { get, api, state, catalog } from "../api.js";
 import { rerender } from "../app.js";
-import { revoke, rotateDialog } from "./users.js";
+import { revoke, rotateDialog, tokenDialog } from "./users.js";
 
 export async function render(el) {
   const me = state.me;
@@ -30,7 +30,7 @@ export async function render(el) {
     h("div", { class: "panel" },
       h("div", { class: "page-head" }, h("div", { class: "grow" }, h("h2", null, "API tokens"),
         h("div", { class: "muted" }, "For the hc CLI and scripts: 'hc config set token'.")),
-        h("button", { onclick: () => newToken(cat) }, "New token")),
+        h("button", { onclick: () => tokenDialog(cat) }, "New token")),
       table([
         { label: "Name", render: (t) => t.name },
         { label: "May", render: (t) => h("span", { class: "mono small" }, t.grant_strings.join(" ")) },
@@ -41,31 +41,3 @@ export async function render(el) {
           h("button", { class: "small reveal", onclick: () => revoke(t) }, "Revoke")] },
       ], tokens, { empty: "No tokens." })));
 }
-
-async function newToken(cat) {
-  const name = input({ placeholder: "laptop, backup script…" });
-  // Only roles within what the user may do: a token can never do more
-  // than its user, so offering more would only mislead.
-  const roles = Object.keys(cat.roles).filter((r) => cat.roles[r].every((g) => {
-    const [res, acc] = g.split(":");
-    return can(res, acc === "write");
-  }));
-  const role = select([["", "everything you may do"], ...roles.map((r) => [r, r + ": " + cat.roles[r].join(" ")])], "");
-  const expires = select([["", "never"], ["30d", "30 days"], ["90d", "90 days"], ["365d", "a year"]], "90d");
-  const err = h("div");
-  await modal("New API token", h("div", null, h("div", { class: "form-grid" }, field("Name", name), field("May do", role), field("Expires", expires)), err), [
-    { label: "Cancel", value: null },
-    { label: "Create", kind: "primary", onclick: async () => {
-      mount(err);
-      try {
-        const t = await api("POST", "/me/tokens", { body: { name: name.value.trim(), role: role.value || undefined, expires_in: expires.value || undefined } });
-        await modal("Token created", h("div", null, h("p", null, "Copy it now: it is not shown again."), copyBox(t.secret)));
-        rerender();
-        return true;
-      } catch (e) {
-        mount(err, errorBox(e));
-        return false;
-      }
-    } },
-  ]);
-}

internal/web/static/assets/pages/bans.js

@@ -0,0 +1,146 @@
+// Ban lists, and the addresses banned in them (docs/bans.md).
+import { h, mount, table, modal, errorBox, field, input, select, checkbox, confirmDialog, badge, toast, relTime } from "../ui.js";
+import { get, api, change, can } from "../api.js";
+import { rerender, onLeave } from "../app.js";
+import { listEditor, fmtSeconds, parseSeconds, rowClass, lookupNames, named, hits, counters } from "../widgets.js";
+
+const scopes = {
+  firewall: "the firewall itself",
+  hosts: "its hosts, behind the firewall",
+  everything: "the firewall and everything behind it",
+};
+
+export async function render(el) {
+  const config = can("config", false);
+  const write = can("config", true);
+  const lists = await get("/banlists");
+  const out = h("div");
+  const draw = async () => {
+    const [bans, cs] = await Promise.all([get("/bans"), counters()]);
+    const names = await lookupNames(bans.map((b) => b.address));
+    const count = {};
+    for (const b of bans) count[b.list_id] = (count[b.list_id] || 0) + 1;
+    mount(out,
+      h("h2", null, "Ban lists"),
+      h("div", { class: "panel" }, table([
+        { label: "Name", render: (l) => h("strong", null, l.name) },
+        { label: "Keeps banned addresses from", render: (l) => [scopes[l.scope] || l.scope, l.hosts && l.hosts.length ? h("span", { class: "mono small" }, ": " + l.hosts.join(", ")) : null] },
+        { label: "Never bans", render: (l) => h("span", { class: "mono small" }, (l.never || []).join(", ") || "–") },
+        { label: "Bans", render: (l) => String(count[l.id] || 0) },
+        { label: "Dropped", render: (l) => hits(cs, "ban" + l.id) },
+        { label: "Comment", render: (l) => l.comment },
+        write ? { label: "", tdClass: "actions-cell", render: (l) => l.pending === "deleted" ? badge("deleted", "err") : [
+          h("button", { class: "small reveal", onclick: () => listDialog(l) }, "Edit"), " ",
+          h("button", { class: "small reveal", onclick: () => del(l) }, "Delete")] } : null,
+      ].filter(Boolean), lists, { empty: "No ban lists yet.", rowClass })),
+      h("h2", null, "Banned addresses"),
+      h("div", { class: "panel" }, table([
+        { label: "Address", render: (b) => h("span", { class: "mono" }, named(names, b.address)) },
+        { label: "List", render: (b) => b.list },
+        { label: "Ports", render: (b) => b.protocol ? b.protocol + "/" + b.port : "all" },
+        { label: "Ends in", render: (b) => b.timeout ? fmtSeconds(b.timeout) : "never" },
+        { label: "Banned", render: (b) => relTime(b.created) },
+        { label: "By", render: (b) => [b.who, b.source ? h("span", { class: "muted small" }, " " + b.source) : null] },
+        { label: "Reason", render: (b) => h("span", { class: "small", title: b.reason || "" }, (b.reason || "").length > 80 ? b.reason.slice(0, 79) + "…" : b.reason || "") },
+        { label: "", tdClass: "actions-cell", render: (b) => mayBan() ? h("button", { class: "small reveal", onclick: () => unban(b, draw) }, "Unban") : null },
+      ], bans, { empty: "Nothing is banned." })));
+  };
+  mount(el,
+    h("div", { class: "page-head" },
+      h("div", { class: "grow" }, h("h1", null, "Bans"), h("div", { class: "muted" },
+        "Programs such as Guard and fail2ban ban addresses into a ban list; the list says what a banned address is kept from. Bans are dropped ahead of every rule, established connections too, and end by themselves.")),
+      h("div", { class: "actions" },
+        lists.length && mayBan() ? h("button", { onclick: () => banDialog(lists, draw) }, "Ban an address…") : null,
+        write ? h("button", { class: "primary", onclick: () => listDialog(null) }, "Add ban list") : null)),
+    config || lists.length ? out : h("div", { class: "empty" }, "No ban lists you may see."));
+  await draw();
+  const t = setInterval(() => { if (!document.hidden && !document.querySelector(".modal")) draw().catch(() => {}); }, 15000);
+  onLeave(() => clearInterval(t));
+}
+
+// mayBan: a bans:write grant may name its lists; the server checks.
+function mayBan() { return can("bans", true); }
+
+async function unban(b, draw) {
+  const what = b.address + (b.protocol ? " (" + b.protocol + "/" + b.port + ")" : "");
+  if (!await confirmDialog("Unban", "Lift the ban on " + what + " in " + b.list + "?", "Unban")) return;
+  try { await api("DELETE", "/banlists/" + encodeURIComponent(b.list) + "/bans/" + b.id); toast("Unbanned " + what); draw(); } catch (e) { toast(e.message, "err"); }
+}
+
+async function del(l) {
+  if (!await confirmDialog("Delete ban list", "Delete ban list " + l.name + "? Its bans are lifted, and programs banning into it are refused.", "Delete", "danger")) return;
+  try { await change("DELETE", "/banlists/" + l.id); rerender(); } catch (e) { modal("Not deleted", errorBox(e)); }
+}
+
+async function banDialog(lists, draw) {
+  const list = select(lists.map((l) => [l.name, l.name + " (" + l.scope + ")"]), lists[0].name);
+  const addr = input({ placeholder: "203.0.113.9 or 2001:db8::9", class: "mono" });
+  const proto = select([["", "every port"], ["tcp", "TCP"], ["udp", "UDP"]], "");
+  const ports = input({ placeholder: "22, ssh, http,https" });
+  const t = input({ placeholder: "the list's default", class: "short" });
+  const reason = input({ placeholder: "why, for the record" });
+  const err = h("div");
+  await modal("Ban an address", h("div", null, h("div", { class: "form-grid" },
+    field("Ban list", list), field("Address", addr, "An IPv6 address is banned with the list's grouping: its /64 unless the list says otherwise."),
+    field("Ports", h("div", { class: "filter-row" }, proto, ports), "Every port, or a protocol's ports (numbers or service names)."),
+    field("For", t, "1h, 1d; empty: the list's default."), field("Reason", reason)), err), [
+    { label: "Cancel", value: null },
+    { label: "Ban", kind: "danger", onclick: async () => {
+      mount(err);
+      const secs = parseSeconds(t.value);
+      if (secs === null) { mount(err, h("div", { class: "msg err" }, "Write the time as 1h, 30m or 1d.")); return false; }
+      if (proto.value && !ports.value.trim()) { mount(err, h("div", { class: "msg err" }, "Give the ports, or ban every port.")); return false; }
+      try {
+        const r = await api("POST", "/banlists/" + encodeURIComponent(list.value) + "/bans", { body: { address: addr.value.trim(), protocol: proto.value,
+          ports: proto.value ? ports.value.trim() : undefined, time: secs || 0, reason: reason.value.trim(), source: "web" } });
+        toast("Banned " + r.bans.map((b) => b.address + (b.protocol ? " " + b.protocol + "/" + b.port : "")).join(", ") + (r.closed ? "; " + r.closed + " connections closed" : ""));
+        draw();
+        return true;
+      } catch (e) { mount(err, errorBox(e)); return false; }
+    } },
+  ], { wide: true });
+}
+
+async function listDialog(l) {
+  l = l || { scope: "firewall", hosts: [], never: [] };
+  const name = input({ value: l.name || "", placeholder: "web", disabled: !!l.id });
+  const scope = select(Object.entries(scopes).map(([k, v]) => [k, k + ": " + v]), l.scope);
+  const hostsEd = listEditor(l.hosts || [], { placeholder: "10.0.10.57, 2001:db8:10::57, or a set", addLabel: "Add host" });
+  const never = listEditor(l.never || [], { placeholder: "198.51.100.0/24, or a set", addLabel: "Add address" });
+  const hostFields = field("Hosts", hostsEd, "The machines this list protects: their addresses, IPv4 and IPv6, or sets. Port forwards to them are covered too.").filter(Boolean);
+  const showHosts = () => { for (const n of hostFields) n.classList.toggle("hidden", scope.value !== "hosts"); };
+  scope.addEventListener("change", showHosts);
+  showHosts();
+  const time = input({ value: l.default_time ? fmtSeconds(l.default_time) : "", placeholder: "1h", class: "short" });
+  const maxTime = input({ value: l.max_time > 0 ? fmtSeconds(l.max_time) : "", placeholder: "7d", class: "short" });
+  const forever = checkbox("no limit: bans may last for ever", l.max_time < 0);
+  const entries = input({ value: l.max_entries || "", placeholder: "10000", class: "short", type: "number" });
+  const group = input({ value: l.group_v6 || "", placeholder: "64", class: "short", type: "number" });
+  const disabled = checkbox("disabled: the list's bans aren't in force", !!l.disabled);
+  const comment = input({ value: l.comment || "" });
+  const err = h("div");
+  await modal(l.id ? "Edit ban list " + l.name : "Add ban list", h("div", null, h("div", { class: "form-grid" },
+    field("Name", name, l.id ? "Programs and tokens know the list by its name, so it can't be changed." : "Programs ban into the list by this name; give each a token for it alone (bans:write:NAME)."),
+    field("Scope", scope, "What a banned address is kept from."), ...hostFields,
+    field("Never ban", never, "Besides what is never banned anyway: inside networks, the firewall's own addresses and whoever asks."),
+    field("Ban time", time, "A ban's length when the program asks for none."),
+    field("Longest ban", maxTime, "Longer bans are cut to this."), h("label"), forever,
+    field("Most bans", entries), field("IPv6 banned by", group, "Prefix length: 64 bans what one customer usually gets, 128 one address."),
+    h("label"), disabled, field("Comment", comment)), err), [
+    { label: "Cancel", value: null },
+    { label: l.id ? "Save" : "Add ban list", kind: "primary", onclick: async () => {
+      mount(err);
+      const t = parseSeconds(time.value), m = parseSeconds(maxTime.value);
+      if (t === null || m === null) { mount(err, h("div", { class: "msg err" }, "Write times as 1h, 30m or 7d.")); return false; }
+      const body = { scope: scope.value, hosts: scope.value === "hosts" ? hostsEd.value() : [], never: never.value(),
+        default_time: t || 0, max_time: forever.input.checked ? -1 : m || 0, max_entries: parseInt(entries.value, 10) || 0,
+        group_v6: parseInt(group.value, 10) || 0, disabled: disabled.input.checked, comment: comment.value.trim() };
+      if (!l.id) body.name = name.value.trim();
+      try {
+        await change(l.id ? "PATCH" : "POST", l.id ? "/banlists/" + l.id : "/banlists", body);
+        rerender();
+        return true;
+      } catch (e) { mount(err, errorBox(e)); return false; }
+    } },
+  ], { wide: true, sticky: true });
+}

internal/web/static/assets/pages/connections.js

@@ -3,7 +3,7 @@
 import { h, mount, input, debounce, toast, confirmDialog, badge } from "../ui.js";
 import { get, api, can } from "../api.js";
 import { onLeave } from "../app.js";
-import { fmtSeconds } from "../widgets.js";
+import { fmtSeconds, lookupNames, named } from "../widgets.js";
 
 export async function render(el, params, query) {
   const search = input({ type: "search", placeholder: "address, :port, protocol, state…", value: query.get("q") || "" });
@@ -22,14 +22,15 @@ export async function render(el, params, query) {
   };
   const draw = async () => {
     shown = await get("/connections", { q: search.value.trim(), limit: 500 });
+    const names = await lookupNames(shown.flatMap((c) => [c.source, c.destination, c.dnat_to]));
     count.textContent = shown.length === 1 ? "1 connection" : shown.length + " connections";
     mount(out, shown.length ? h("div", { class: "table-wrap" }, h("table", null,
       h("thead", null, h("tr", null, ["Protocol", "From", "To", "NAT", "State", "Expires", ""].map((t) => h("th", null, t)))),
       h("tbody", null, shown.map((c) => h("tr", null,
         h("td", null, c.protocol),
-        h("td", { class: "mono" }, hostPort(c.source, c.source_port)),
-        h("td", { class: "mono" }, hostPort(c.destination, c.destination_port)),
-        h("td", { class: "mono small" }, c.dnat_to ? "to " + hostPort(c.dnat_to, c.dnat_port || c.destination_port) : "", c.snat_to ? (c.dnat_to ? ", " : "") + "as " + c.snat_to : ""),
+        h("td", { class: "mono" }, named(names, c.source, hostPort(c.source, c.source_port))),
+        h("td", { class: "mono" }, named(names, c.destination, hostPort(c.destination, c.destination_port))),
+        h("td", { class: "mono small" }, c.dnat_to ? ["to ", named(names, c.dnat_to, hostPort(c.dnat_to, c.dnat_port || c.destination_port))] : "", c.snat_to ? (c.dnat_to ? ", " : "") + "as " + c.snat_to : ""),
         h("td", null, c.state || "", c.assured ? null : [" ", badge("one way", "")]),
         h("td", { class: "small" }, fmtSeconds(c.timeout)),
         h("td", { class: "actions-cell" }, write ? h("button", { class: "small reveal", onclick: () => close([c], "this connection") }, "Close") : null)))))) :

internal/web/static/assets/pages/dashboard.js

@@ -1,9 +1,9 @@
-// Dashboard: the ruleset's state, problems, interfaces, the busiest rules
-// and the latest drops.
-import { h, mount, table, badge, problemsList, time } from "../ui.js";
+// Dashboard: the ruleset's state, problems, interfaces, the busiest rules,
+// the quotas and the latest drops.
+import { h, mount, table, badge, problemsList, time, plural } from "../ui.js";
 import { get, can } from "../api.js";
 import { onLeave } from "../app.js";
-import { describe, hits, humanCount } from "../widgets.js";
+import { describe, hits, humanCount, fmtBytes, usageBar, lookupNames, named, pct } from "../widgets.js";
 import { lineChart, chartCard, legend, timeTable, stepSeconds } from "../charts.js";
 import { bytes } from "./stats.js";
 
@@ -11,12 +11,13 @@ export async function render(el) {
   const draw = async () => {
     const st = await get("/status");
     const config = can("config", false), logs = can("log", false);
-    const [rules, cs, log, tl, zones] = await Promise.all([
+    const [rules, cs, log, tl, zones, quotas] = await Promise.all([
       config ? get("/rules") : [],
       logs ? get("/counters").then((c) => c.counters).catch(() => ({})) : {},
       logs ? get("/log", { limit: 8 }).catch(() => []) : [],
       logs ? get("/stats/timeline", { since: "24h", step: "1h", keys: "zrx:*,ztx:*,drops" }).catch(() => null) : null,
       config ? get("/zones").catch(() => []) : [],
+      logs ? get("/quotas").catch(() => []) : [],
     ]);
     const busiest = rules.filter((r) => cs["r" + r.id] && cs["r" + r.id].packets > 0)
       .sort((a, b) => cs["r" + b.id].packets - cs["r" + a.id].packets).slice(0, 8);
@@ -49,11 +50,12 @@ export async function render(el) {
         h("div", { class: "panel-head" }, h("h2", null, "Busiest rules"), h("a", { class: "button small", href: "#/rules" }, "All rules")),
         table([
           { label: "Chain", render: (r) => r.chain },
-          { label: "Rule", render: (r) => r.raw || describe(r) },
+          { label: "Rule", render: (r) => h("a", { href: "#/rules?chain=" + r.chain + "&rule=" + r.id }, "#" + r.id + " ", r.raw || describe(r)) },
           { label: "Action", render: (r) => badge(r.action, { accept: "ok", drop: "err", reject: "warn" }[r.action]) },
           { label: "Hits", render: (r) => hits(cs, "r" + r.id) },
           { label: "Comment", render: (r) => r.comment },
         ], busiest)) : null,
+      quotas.length ? quotaPanel(quotas, await lookupNames(quotas.map((q) => (q.addresses || [])[0]).filter(Boolean).map((a) => a.address))) : null,
       log.length ? h("div", { class: "panel" },
         h("div", { class: "panel-head" }, h("h2", null, "Latest logged packets"), h("a", { class: "button small", href: "#/log" }, "The log")),
         table([
@@ -69,6 +71,31 @@ export async function render(el) {
   onLeave(() => clearInterval(t));
 }
 
+// quotaPanel lists every rule's quota with what it used: the total, or
+// for a per-address quota how many addresses used theirs up and the
+// busiest (the rest are on the rule). A per-address quota's bar is all
+// its addresses together, so one address alone can't fill it.
+function quotaPanel(quotas, names) {
+  const perAddress = (q) => q.quota.per_source || q.quota.per_destination;
+  const addrs = (q) => q.addresses || [];
+  const usedUp = (q) => addrs(q).filter((a) => a.used >= q.quota.bytes).length;
+  const bar = (q) => perAddress(q)
+    ? usageBar(addrs(q).reduce((n, a) => n + Math.min(a.used, q.quota.bytes), 0), addrs(q).length * q.quota.bytes)
+    : usageBar(q.used, q.quota.bytes);
+  return h("div", { class: "panel" },
+    h("div", { class: "panel-head" }, h("h2", null, "Quotas"), h("a", { class: "button small", href: "#/stats" }, "Statistics")),
+    table([
+      { label: "Rule", render: (q) => h("a", { href: "#/rules?rule=" + q.rule_id }, q.rule) },
+      { label: "Allowance", render: (q) => fmtBytes(q.quota.bytes) + (q.quota.per_source ? " each source" : q.quota.per_destination ? " each destination" : "") },
+      { label: "Used", render: (q) => perAddress(q)
+        ? [plural(addrs(q).length, "address", "addresses"), usedUp(q) ? ", " + usedUp(q) + " used up" : "",
+          addrs(q).length ? [", busiest ", named(names, addrs(q)[0].address), " " + fmtBytes(addrs(q)[0].used) + " (" + pct(addrs(q)[0].used, q.quota.bytes) + ")"] : ""]
+        : fmtBytes(q.used) + " (" + pct(q.used, q.quota.bytes) + ")" },
+      { label: "", render: (q) => addrs(q).length || !perAddress(q) ? bar(q) : "" },
+      { label: "Next reset", render: (q) => q.next_reset ? time(q.next_reset) : h("span", { class: "muted" }, "by hand") },
+    ], quotas));
+}
+
 // statsCharts: the last 24 hours' traffic with the internet and drops,
 // per hour (the Statistics page has the rest).
 function statsCharts(tl, zones) {

internal/web/static/assets/pages/history.js

@@ -1,5 +1,5 @@
 // History: every configuration change, with undo.
-import { h, mount, table, time, confirmDialog, modal, errorBox, badge } from "../ui.js";
+import { h, mount, table, time, confirmDialog, modal, errorBox, badge, diffView } from "../ui.js";
 import { get, change, can, state } from "../api.js";
 import { rerender } from "../app.js";
 
@@ -29,7 +29,7 @@ async function undo(e) {
 }
 
 async function entry(el, id) {
-  const e = await get("/history/" + id);
+  const [e, d] = await Promise.all([get("/history/" + id), get("/history/" + id + "/diff").catch(() => null)]);
   mount(el,
     h("nav", { class: "back-link" }, h("a", { href: "#/history" }, "← History")),
     h("div", { class: "page-head" },
@@ -40,7 +40,11 @@ async function entry(el, id) {
       can("config", true) && !e.reverted_by ? h("div", { class: "actions" }, h("button", { onclick: () => undo(e) }, "Undo")) : null),
     e.changes.map((c) => h("div", { class: "panel" },
       h("h3", null, action(c) + " " + c.kind + " ", h("span", { class: "mono" }, c.label)),
-      fieldsTable(c))));
+      fieldsTable(c))),
+    d ? h("div", { class: "panel" },
+      h("h3", null, "Ruleset"),
+      h("p", { class: "muted small" }, "What this change did to the ruleset, rendered by this version of Housecarl."),
+      diffView(d.diff)) : null);
 }
 
 function action(c) {
@@ -50,9 +54,10 @@ function action(c) {
 }
 
 // fieldsTable lists the fields that differ (all of them for a create or
-// delete).
+// delete). An object within (settings' builtins) is listed by its own
+// fields, "builtins.drop_invalid", so only what changed shows.
 function fieldsTable(c) {
-  const a = c.before || {}, b = c.after || {};
+  const a = flatten(c.before || {}), b = flatten(c.after || {});
   const keys = [...new Set([...Object.keys(a), ...Object.keys(b)])].sort();
   const show = (v, k) => {
     if (v === undefined || v === "") return "–";
@@ -68,3 +73,14 @@ function fieldsTable(c) {
     c.after ? { label: c.before ? "After" : "Value", render: (k) => h("span", { class: "mono small" }, show(b[k], k)) } : null,
   ].filter(Boolean), rows);
 }
+
+// flatten lifts the fields of objects within an object to dotted keys
+// ({builtins: {loopback: true}} → {"builtins.loopback": true}); lists
+// stay whole.
+function flatten(o, prefix = "", out = {}) {
+  for (const [k, v] of Object.entries(o)) {
+    if (v && typeof v === "object" && !Array.isArray(v) && Object.keys(v).length) flatten(v, prefix + k + ".", out);
+    else out[prefix + k] = v;
+  }
+  return out;
+}

internal/web/static/assets/pages/log.js

@@ -3,6 +3,7 @@
 import { h, mount, input, debounce, badge } from "../ui.js";
 import { get, state } from "../api.js";
 import { onLeave } from "../app.js";
+import { lookupNames, named } from "../widgets.js";
 
 export async function render(el, params, query) {
   const search = input({ type: "search", placeholder: "address, interface, rule…", value: query.get("q") || "" });
@@ -12,14 +13,16 @@ export async function render(el, params, query) {
   const addr = (a, port) => port ? (a.includes(":") ? "[" + a + "]:" + port : a + ":" + port) : a;
   const draw = async () => {
     const es = await get("/log", { limit: 300, q: search.value.trim() });
+    const names = await lookupNames(es.flatMap((e) => [e.source, e.destination]));
     mount(out, es.length ? h("div", { class: "table-wrap" }, h("table", { class: "activity" },
       h("thead", null, h("tr", null, ["Time", "Why", "In", "Out", "From", "To", "Protocol"].map((t) => h("th", null, t)))),
       h("tbody", null, es.map((e) => h("tr", null,
         h("td", { class: "mono small" }, new Date(e.time).toLocaleTimeString(undefined, { hourCycle: "h23" })),
-        h("td", null, e.mark && e.mark.startsWith("r") ? h("a", { href: "#/rules", title: "rule " + e.mark.slice(1) }, e.prefix) : e.prefix,
+        h("td", null, e.mark && e.mark.startsWith("r") ? h("a", { href: "#/rules?rule=" + e.mark.slice(1), title: "rule #" + e.mark.slice(1) }, e.prefix) : e.prefix,
           e.shadow && /^(drop|reject)$/.test(e.verdict) ? [" ", badge("would " + e.verdict, "warn")] : null),
         h("td", { class: "mono" }, e.in || ""), h("td", { class: "mono" }, e.out || ""),
-        h("td", { class: "mono" }, addr(e.source, e.source_port)), h("td", { class: "mono" }, addr(e.destination, e.destination_port)),
+        h("td", { class: "mono" }, named(names, e.source, addr(e.source, e.source_port))),
+        h("td", { class: "mono" }, named(names, e.destination, addr(e.destination, e.destination_port))),
         h("td", null, e.protocol, e.icmp_type ? " " + e.icmp_type : "", e.tcp_flags ? h("span", { class: "muted small" }, " " + e.tcp_flags) : null)))))) :
       h("div", { class: "empty" }, state.me.mode === "shadow"
         ? "Nothing logged yet. In shadow mode, what the policies would drop is logged; turn logging on for a rule with Edit → Log."

internal/web/static/assets/pages/matrix.js

@@ -11,7 +11,7 @@ export async function render(el) {
   const name = (z) => z === "firewall" ? h("em", null, "firewall") : z;
   mount(el,
     h("div", { class: "page-head" }, h("div", { class: "grow" }, h("h1", null, "Zone matrix"),
-      h("div", { class: "muted" }, "What happens to a new connection from a zone (rows) to a zone (columns), or to and from the firewall itself, worked out from the rules in order: allowed or blocked, and how many rules decide for part of the traffic first (some services, addresses, times). Click a cell for the rules."))),
+      h("div", { class: "muted" }, "What happens to a new connection from a zone (rows) to a zone (columns), or to and from the firewall itself, worked out from the rules in order: all allowed, all blocked, or partly (some services, addresses or times let through, the rest not). Click a cell for the rules."))),
     pending ? h("div", { class: "msg info" }, "Shown with your pending changes.") : null,
     !m.zones.length ? h("div", { class: "panel" }, h("div", { class: "empty" }, "No zones yet: add them under Objects → Zones.")) :
     h("div", { class: "panel" }, h("div", { class: "table-wrap" }, h("table", { class: "matrix" },
@@ -19,20 +19,32 @@ export async function render(el) {
       h("tbody", null, cols.map((from) => h("tr", null, h("th", null, name(from)), cols.map((to) => {
         const c = cells.get(from + "\u0000" + to);
         if (!c) return h("td", { class: "matrix-none" }, "–");
-        const n = c.exceptions.length;
-        return h("td", { class: "matrix-" + c.verdict + (n ? " matrix-some" : ""), title: c.verdict + " by " + c.decided_by + (n ? ", " + n + " exception" + (n === 1 ? "" : "s") + " first" : "") },
-          h("button", { type: "button", class: "matrix-cell", onclick: () => detail(c) }, c.verdict, n ? h("span", { class: "matrix-n" }, "+" + n) : null));
+        const open = c.open || [];
+        const counts = [c.allowed ? "+" + c.allowed : "", c.blocked ? "−" + c.blocked : ""].filter(Boolean).join(" ");
+        const title = (c.same_zone ? c.note + ". " : "") + "The rest: " + c.verdict + " by " + c.decided_by +
+          (c.allowed ? "; " + c.allowed + " rule(s) let part of it through" : "") + (c.blocked ? "; " + c.blocked + " block part of it" : "");
+        return h("td", { class: "matrix-" + c.summary + (c.same_zone ? " matrix-same" : ""), title },
+          h("button", { type: "button", class: "matrix-cell", onclick: () => detail(c) },
+            c.summary === "partly" ? "partly" : c.verdict, counts ? h("span", { class: "matrix-n" }, counts) : null,
+            open.length && !c.same_zone ? h("span", { class: "matrix-open" }, open.slice(0, 3).join(" · ") + (open.length > 3 ? " · +" + (open.length - 3) + " more" : "")) : null));
       })))))),
-      h("p", { class: "muted small" }, "Zone to zone is the forward chain; to the firewall, input; from it, output. Exceptions are rules (and built-ins such as ping or port forwards) that decide for some of the traffic before the rest falls to the deciding rule or the policy. Replies and established connections aren't shown: the built-in lets those through.")));
+      h("p", { class: "muted small" }, "Zone to zone is the forward chain; to the firewall, input; from it, output. +N: rules (and built-ins such as ping or port forwards) that let part of the traffic through before the rest falls to the deciding rule or the policy; −N: those that block part of it. Under each cell, what is let through. A zone to itself (faded): only traffic routed between its interfaces passes the firewall. Replies and established connections aren't shown: the built-in lets those through.")));
 }
 
 function detail(c) {
-  const ruleLink = (id, chain, label) => id ? h("a", { href: "#/rules?chain=" + chain, onclick: () => document.querySelector(".modal-back") && document.querySelector(".modal-back").remove() }, label) : label;
+  const ruleLink = (id, chain, label) => id ? h("a", { href: "#/rules?chain=" + chain + "&rule=" + id, onclick: () => document.querySelector(".modal-back") && document.querySelector(".modal-back").remove() }, label) : label;
   const v = (verdict) => badge(verdict, { allowed: "ok", blocked: "err", logged: "", unknown: "warn" }[verdict]);
+  const hits = (n) => h("td", { class: "small num" }, n === undefined || n === null ? "–" : n.toLocaleString());
+  const summary = { allowed: "all allowed", blocked: "all blocked", partly: "partly allowed" }[c.summary];
   modal(c.from + " → " + c.to, h("div", null,
-    h("p", { class: "muted" }, "New connections, checked in this order (the " + c.chain + " chain):"),
-    h("div", { class: "table-wrap" }, h("table", null, h("tbody", null,
-      c.exceptions.map((e) => h("tr", null, h("td", null, v(e.verdict)), h("td", null, e.what), h("td", { class: "small" }, ruleLink(e.rule_id, e.chain, e.label)))),
-      h("tr", { class: "matrix-rest" }, h("td", null, v(c.verdict)), h("td", null, h("strong", null, c.exceptions.length ? "the rest" : "everything")),
-        h("td", { class: "small" }, ruleLink(c.rule_id, c.chain, c.decided_by))))))), [{ label: "Close", value: null }], { wide: true });
+    h("p", null, h("strong", null, summary), h("span", { class: "muted" }, " · new connections, checked in this order (the " + c.chain + " chain):")),
+    c.note ? h("div", { class: "msg info" }, c.note[0].toUpperCase() + c.note.slice(1) + ".") : null,
+    h("div", { class: "table-wrap" }, h("table", null,
+      h("thead", null, h("tr", null, h("th", null, ""), h("th", null, "What"), h("th", null, "By"), h("th", { class: "num" }, "Hits"))),
+      h("tbody", null,
+        c.exceptions.map((e) => h("tr", null, h("td", null, v(e.verdict)), h("td", null, e.what), h("td", { class: "small" }, ruleLink(e.rule_id, e.chain, e.label)), hits(e.hits))),
+        h("tr", { class: "matrix-rest" }, h("td", null, v(c.verdict)), h("td", null, h("strong", null, c.exceptions.length ? "the rest" : "everything")),
+          h("td", { class: "small" }, ruleLink(c.rule_id, c.chain, c.decided_by)), hits(c.hits))))),
+    h("p", { class: "muted small" }, "Hits: each rule's packets since housecarld started, in all its traffic: a rule can cover several pairs.")),
+    [{ label: "Close", value: null }], { wide: true });
 }

internal/web/static/assets/pages/rules.js

@@ -2,7 +2,7 @@
 import { h, mount, table, modal, errorBox, field, input, select, checkbox, confirmDialog, badge, textarea, toast } from "../ui.js";
 import { get, api, change, can } from "../api.js";
 import { rerender } from "../app.js";
-import { names, matchEditor, describe, hits, counters, listEditor, rowClass, live, fmtBytes, quotas } from "../widgets.js";
+import { names, matchEditor, describe, hits, counters, listEditor, rowClass, live, fmtBytes, quotas, usageBar, lookupNames, named, pct } from "../widgets.js";
 
 const chains = [
   ["input", "Input", "Traffic to the firewall itself."],
@@ -24,7 +24,14 @@ const builtins = {
 };
 
 export async function render(el, params, query) {
-  const chain = query.get("chain") || "input";
+  // ?rule=ID (from the matrix, the log, the tracer, statistics): show
+  // that rule, in its chain, highlighted.
+  const target = Number(query.get("rule")) || 0;
+  let chain = query.get("chain");
+  if (!chain && target) {
+    try { chain = (await get("/rules/" + target)).chain; } catch { /* gone: the default chain */ }
+  }
+  chain = chain || "input";
   const [all, settings, cs, qs] = await Promise.all([get("/rules", { chain }), get("/settings"), counters(), quotas()]);
   // As nftables checks them: the rules that count traffic first.
   const rules = [...all.filter(everyPacket), ...all.filter((r) => !everyPacket(r))];
@@ -40,7 +47,8 @@ export async function render(el, params, query) {
     h("div", { class: "panel" },
       builtinsRow(chain, settings, cs),
       table([
-        { label: "#", render: (r) => r.pending === "deleted" ? "" : String(live(rules).indexOf(r) + 1) },
+        { label: "Order", render: (r) => r.pending === "deleted" ? "" : String(live(rules).indexOf(r) + 1) },
+        { label: "ID", render: (r) => r.id ? h("span", { class: "muted mono small" }, "#" + r.id) : "" },
         { label: "Match", render: (r) => r.raw ? [badge("raw", ""), " ", h("span", { class: "mono small" }, r.raw)]
           : [everyPacket(r) ? [badge("every packet", "accent"), " "] : null, describe(r), extras(r, qs[r.id])] },
         { label: "Action", render: actionBadge },
@@ -59,10 +67,15 @@ export async function render(el, params, query) {
           h("button", { class: "small reveal", onclick: () => del(r) }, "Delete"),
         ];
         } } : null,
-      ].filter(Boolean), rules, { empty: "No rules in this chain yet.", rowClass }),
+      ].filter(Boolean), rules, { empty: "No rules in this chain yet.", rowClass: (r) => rowClass(r) + (target && r.id === target ? " row-target" : "") }),
       rules.some(everyPacket) ? h("div", { class: "muted small" }, "Rules marked “every packet” are checked before established connections are accepted: they see all of a connection's traffic, not only its first packet, so a quota counts all of it and a block stops connections already open. They can drop, reject or log, not accept.") : null,
       h("div", { class: "policy small" }, "Then the policy: ", badge(policy, policy === "drop" ? "err" : "ok"),
         policy === "drop" ? [" — ", hits(cs, "p-" + chain), " packets reached it"] : null)));
+  if (target) {
+    const row = el.querySelector("tr.row-target");
+    if (row) requestAnimationFrame(() => row.scrollIntoView({ block: "center" }));
+    else el.querySelector(".tabs").after(h("div", { class: "msg warn" }, "There is no rule #" + target + " (any more)."));
+  }
 }
 
 // everyPacket: checked before established connections are accepted (as
@@ -145,46 +158,87 @@ function extras(r, q) {
   return out;
 }
 
-// quotaLine shows a quota, and what it used: in total, or per address
-// (the busiest, and the rest in a dialog).
+// quotaLine sums up a quota on the rule's row: what it used (in total,
+// or how many addresses and the busiest); the rest is in its dialog.
 function quotaLine(r, q) {
   const qt = r.quota;
   const each = qt.per_source ? " each source" : qt.per_destination ? " each destination" : "";
-  const resets = qt.reset === "monthly" ? "monthly on day " + (qt.day || 1) : qt.reset || "by hand";
-  let used = null;
-  if (q && !qt.per_source && !qt.per_destination) {
-    used = [h("strong", null, fmtBytes(q.used)), " of " + fmtBytes(qt.bytes) + " used"];
-  } else if (q) {
-    const n = (q.addresses || []).length;
-    used = [n === 1 ? "1 address" : n + " addresses", n ? [", busiest ", h("strong", null, fmtBytes(q.addresses[0].used))] : null, " ",
-      n ? h("button", { class: "small", onclick: () => usageDialog(r, q) }, "Usage…") : null];
+  const resets = qt.reset === "monthly" ? "monthly" : qt.reset || "reset by hand";
+  let used = fmtBytes(qt.bytes) + each;
+  if (q && !each) used = fmtBytes(q.used) + " of " + fmtBytes(qt.bytes) + " used (" + pct(q.used, qt.bytes) + ")";
+  else if (q) {
+    const a = q.addresses || [], n = a.length;
+    const up = a.filter((x) => x.used >= qt.bytes).length;
+    used += " · " + (n === 1 ? "1 address" : n + " addresses") + (up ? ", " + up + " used up" : "") + (n ? ", busiest " + fmtBytes(a[0].used) + " (" + pct(a[0].used, qt.bytes) + ")" : "");
   }
-  return h("div", { class: "muted small" }, (qt.over ? "quota over " : "quota ") + fmtBytes(qt.bytes) + each + ", resets " + resets,
-    used ? [" · ", used] : null,
-    q && q.next_reset ? " · next reset " + new Date(q.next_reset).toLocaleString() : null,
-    can("config", true) && q && r.pending !== "new" ? [" ", h("button", { class: "small", onclick: () => resetQuota(r) }, "Reset")] : null);
+  const text = "quota " + used + " · " + resets;
+  return h("div", { class: "muted small" }, q && r.pending !== "new"
+    ? h("button", { class: "link small", title: "Usage, reset and give back", onclick: () => quotaDialog(r, q) }, text) : text);
 }
 
-async function usageDialog(r, q) {
-  await modal("Quota usage of " + (r.comment || "rule #" + r.id), h("div", null,
-    h("p", { class: "muted" }, "Each " + (r.quota.per_source ? "source" : "destination") + " has " + fmtBytes(r.quota.bytes) + "."),
-    table([
-      { label: "Address", render: (a) => h("span", { class: "mono" }, a.address) },
+// quotaDialog shows a quota in full: what it used (each address's, for a
+// per-address one), its resets, and resetting or giving back.
+async function quotaDialog(r, q) {
+  const qt = r.quota;
+  const perAddress = qt.per_source || qt.per_destination;
+  const write = can("config", true);
+  const resets = qt.reset === "monthly" ? "monthly on day " + (qt.day || 1) : qt.reset || "only by hand";
+  const when = (t) => t ? new Date(t).toLocaleString() : "–";
+  const names = perAddress ? await lookupNames((q.addresses || []).map((a) => a.address)) : {};
+  // A row's action closes this dialog first: it opens one of its own.
+  const then = (f) => (e) => { e.target.closest(".modal").querySelector(".buttons button:last-child").click(); f(); }; // Close
+  const v = await modal("Quota of " + (r.comment || "rule #" + r.id), h("div", null,
+    h("p", null, fmtBytes(qt.bytes) + (perAddress ? (qt.per_source ? " for each source" : " for each destination") : " in all") + "; the rule matches " +
+      (qt.over ? "once it is used up" : "while it lasts") + ". Resets " + resets + "."),
+    h("p", { class: "muted small" }, "Last reset " + when(q.last_reset) + " · next reset " + when(q.next_reset)),
+    perAddress ? table([
+      { label: "Address", render: (a) => h("span", { class: "mono" }, named(names, a.address)) },
       { label: "Used", render: (a) => fmtBytes(a.used) },
-      { label: "", render: (a) => h("div", { class: "usage" }, h("div", { class: "usage-bar" + (a.used >= r.quota.bytes ? " full" : "") }, bar(a.used / r.quota.bytes))) },
-    ], q.addresses)), [{ label: "Close", value: null }], { wide: true });
+      { label: "", class: "num", tdClass: "num", render: (a) => pct(a.used, qt.bytes) },
+      { label: "", render: (a) => usageBar(a.used, qt.bytes) },
+      write ? { label: "", render: (a) => h("span", { class: "nowrap" },
+        h("button", { class: "small", onclick: then(() => resetQuota(r, a.address)) }, "Reset"), " ",
+        h("button", { class: "small", onclick: then(() => giveBack(r, a.address)) }, "Give back…")) } : null,
+    ].filter(Boolean), q.addresses || [], { empty: "No address has used it since the last reset." })
+      : h("div", null, h("strong", null, fmtBytes(q.used)), " of " + fmtBytes(qt.bytes) + " used (" + pct(q.used, qt.bytes) + ")", usageBar(q.used, qt.bytes))),
+  [
+    ...(write ? [{ label: perAddress ? "Reset all" : "Reset", value: "reset" }, { label: perAddress ? "Give back to all…" : "Give back…", value: "give" }] : []),
+    { label: "Close", value: null },
+  ], { wide: perAddress });
+  if (v === "reset") resetQuota(r);
+  if (v === "give") giveBack(r);
 }
 
-function bar(f) {
-  const seg = h("div", { class: "seg leased" });
-  seg.style.width = Math.min(100, f * 100) + "%";
-  return seg;
+// giveBack takes an amount off what a quota used (one address's, or
+// everyone's): extra allowance until its next reset.
+async function giveBack(r, address) {
+  const amount = input({ type: "number", min: 1, value: "1", class: "short" });
+  const unit = select([["mb", "MB"], ["gb", "GB"]], "gb", { class: "inline" });
+  const perAddress = r.quota.per_source || r.quota.per_destination;
+  const who = address ? " for " + address : perAddress ? " for every address" : "";
+  await modal("Give back quota", h("div", null,
+    h("p", null, "Take this much off what " + (r.comment || "rule #" + r.id) + "'s quota used" + who + ": extra allowance until its next reset, without changing the rule. This is done at once, not staged."),
+    field("Amount", h("div", null, amount, " ", unit))), [
+    { label: "Cancel", value: null },
+    { label: "Give back", kind: "primary", onclick: async () => {
+      const n = parseInt(amount.value, 10);
+      if (!(n > 0)) { toast("Give an amount of 1 or more", "err"); return false; }
+      const give = n * (unit.value === "gb" ? 1 << 30 : 1 << 20);
+      try {
+        await api("POST", "/rules/" + r.id + "/reset-quota", { body: address ? { give, address } : { give } });
+        toast("Gave back " + fmtBytes(give)); rerender();
+      } catch (e) { modal("Not given back", errorBox(e)); return false; }
+    } },
+  ]);
 }
 
-async function resetQuota(r) {
+async function resetQuota(r, address) {
   if (!await confirmDialog("Reset the quota", "Start the quota of " + (r.comment || "rule #" + r.id) + " again now" +
-    (r.quota.per_source || r.quota.per_destination ? ", for every address" : "") + "? This is done at once, not staged.", "Reset")) return;
-  try { await api("POST", "/rules/" + r.id + "/reset-quota"); toast("Quota reset"); rerender(); } catch (e) { modal("Not reset", errorBox(e)); }
+    (address ? " for " + address : r.quota.per_source || r.quota.per_destination ? ", for every address" : "") + "? This is done at once, not staged.", "Reset")) return;
+  try {
+    await api("POST", "/rules/" + r.id + "/reset-quota", address ? { body: { address } } : {});
+    toast("Quota reset"); rerender();
+  } catch (e) { modal("Not reset", errorBox(e)); }
 }
 
 async function move(r, where) {
@@ -206,6 +260,9 @@ export async function ruleDialog(r, chain) {
   r = r || { chain, action: "accept" };
   const ch = select(["input", "forward", "output", "early"], r.chain || chain);
   const match = matchEditor(r, n);
+  const chainZones = () => match.zones(ch.value !== "output", ch.value === "forward" || ch.value === "output");
+  ch.addEventListener("change", chainZones);
+  chainZones();
   const action = select([["accept", "accept"], ["drop", "drop"], ["reject", "reject"], ["log", "log only (and go on)"]], r.action);
   const rejectWith = select([["", "with an ICMP error"], ["tcp-reset", "with a TCP reset (TCP rules only)"]], r.reject_with || "");
   const every = checkbox("every packet: also stop connections already open, not just new ones", r.every_packet);
@@ -317,6 +374,7 @@ export async function ruleDialog(r, chain) {
   const addersLabel = h("label");
   sections.raw.onShow = (on) => {
     for (const n of [...matchNodes, ...actionField, ...logField]) n.classList.toggle("hidden", on);
+    if (!on) chainZones();
     for (const [k, sec] of Object.entries(sections)) {
       if (k === "raw") continue;
       if (on && sec.open) for (const n of sec.nodes) n.classList.add("hidden");

internal/web/static/assets/pages/sets.js

@@ -1,5 +1,5 @@
-// Address sets, and dynamic sets' entries.
-import { h, mount, table, modal, errorBox, field, input, checkbox, confirmDialog, badge, toast } from "../ui.js";
+// Address sets, dynamic sets' entries, and what Jarl sets hold.
+import { h, mount, table, modal, errorBox, field, input, select, confirmDialog, badge, toast, fmtTime } from "../ui.js";
 import { get, api, change, can } from "../api.js";
 import { rerender } from "../app.js";
 import { listEditor, fmtSeconds, parseSeconds, rowClass } from "../widgets.js";
@@ -9,11 +9,14 @@ export async function render(el) {
   const write = can("config", true);
   mount(el,
     h("div", { class: "page-head" },
-      h("div", { class: "grow" }, h("h1", null, "Address sets"), h("div", { class: "muted" }, "Named lists of IPv4 and IPv6 addresses, prefixes and ranges, mixed. A dynamic set takes entries at run time, each with a timeout (a captive portal's signed-in clients).")),
+      h("div", { class: "grow" }, h("h1", null, "Address sets"), h("div", { class: "muted" }, "Named lists of IPv4 and IPv6 addresses, prefixes and ranges, mixed. A dynamic set takes entries at run time, each with a timeout (a captive portal's signed-in clients). A Jarl set holds the addresses of names in Jarl, kept up to date.")),
       write ? h("div", { class: "actions" }, h("button", { class: "primary", onclick: () => setDialog(null) }, "Add set")) : null),
     h("div", { class: "panel" }, table([
       { label: "Name", render: (s) => h("strong", null, s.name) },
-      { label: "Entries", render: (s) => s.dynamic ? [badge("dynamic", "accent"), s.timeout ? " timeout " + fmtSeconds(s.timeout) : "", " ",
+      { label: "Entries", render: (s) => s.jarl ? [badge("Jarl", "accent"), " ", h("span", { class: "mono small" }, jarlNames(s).join(", ")),
+        h("span", { class: "muted small" }, " within " + s.jarl.within.join(", ")), " ",
+        s.pending ? null : h("button", { class: "small", onclick: () => jarlStatus(s) }, "Addresses…")]
+        : s.dynamic ? [badge("dynamic", "accent"), s.timeout ? " timeout " + fmtSeconds(s.timeout) : "", " ",
         s.pending ? null : h("button", { class: "small", onclick: () => entries(s) }, "Entries…")] : h("span", { class: "mono small" }, s.entries.join(", ")) },
       { label: "Comment", render: (s) => s.comment },
       write ? { label: "", tdClass: "actions-cell", render: (s) => s.pending === "deleted" ? badge("deleted", "err") : [
@@ -27,33 +30,52 @@ async function del(s) {
   try { await change("DELETE", "/sets/" + s.id); rerender(); } catch (e) { modal("Not deleted", errorBox(e)); }
 }
 
+const nameOf = (n) => n.view ? n.name + "@" + n.view : n.name;
+const jarlNames = (s) => (s.jarl.names || []).map(nameOf);
+
+// parseJarlName reads "name" or "name@view".
+function parseJarlName(v) {
+  const i = v.indexOf("@");
+  return i < 0 ? { name: v } : { name: v.slice(0, i), view: v.slice(i + 1) };
+}
+
 async function setDialog(s) {
   s = s || { entries: [] };
+  const zones = (await get("/zones")).map((z) => z.name);
   const name = input({ value: s.name || "", placeholder: "trusted" });
   const list = listEditor(s.entries, { placeholder: "192.168.1.0/24, 2001:db8:1::/64, 192.168.1.100-192.168.1.199", addLabel: "Add entry" });
-  const dynamic = checkbox("dynamic: entries are added at run time (the Entries button, hc set entries, a program with a token), each for a time", s.dynamic);
-  // A dynamic set has no configured entries; only it has a timeout.
+  const kind = select([["list", "addresses listed here"], ["dynamic", "dynamic: entries added at run time, each for a time"], ["jarl", "from Jarl: the addresses of names in Jarl"]],
+    s.jarl ? "jarl" : s.dynamic ? "dynamic" : "list");
+  const names = listEditor(s.jarl ? jarlNames(s) : [], { placeholder: "nas.example.com@internal", addLabel: "Add name" });
+  const within = listEditor(s.jarl ? s.jarl.within : [], { placeholder: "lan, or 10.10.0.0/24", addLabel: "Add zone or network", suggestions: zones });
+  const timeout = input({ value: s.timeout ? fmtSeconds(s.timeout) : "", placeholder: "1h, 1d (none: until removed)", class: "short" });
+  // Each kind shows its own fields.
   const entryFields = field("Entries", list).filter(Boolean);
   const timeoutFields = field("Entry timeout", timeout, "How long an entry stays unless it is added with its own. Empty: until removed (or a reboot).").filter(Boolean);
+  const jarlFields = [
+    ...field("Names in Jarl", names, "The set holds their A and AAAA records' addresses (all of them), CNAMEs followed. Write NAME@VIEW, or just NAME if only one of Jarl's views has it. Read again every minute.").filter(Boolean),
+    ...field("Within", within, "Where its addresses may be: zones (the networks connected to their interfaces) or networks. An address elsewhere is left out, so a changed record in Jarl can't let anything else in.").filter(Boolean),
+  ];
   const showKind = () => {
-    for (const n of entryFields) n.classList.toggle("hidden", dynamic.input.checked);
-    for (const n of timeoutFields) n.classList.toggle("hidden", !dynamic.input.checked);
+    for (const n of entryFields) n.classList.toggle("hidden", kind.value !== "list");
+    for (const n of timeoutFields) n.classList.toggle("hidden", kind.value !== "dynamic");
+    for (const n of jarlFields) n.classList.toggle("hidden", kind.value !== "jarl");
   };
-  dynamic.input.addEventListener("change", showKind);
+  kind.addEventListener("change", showKind);
   showKind();
-  const timeout = input({ value: s.timeout ? fmtSeconds(s.timeout) : "", placeholder: "1h, 1d (none: until removed)", class: "short" });
   const comment = input({ value: s.comment || "" });
   const err = h("div");
   await modal(s.id ? "Edit set " + s.name : "Add set", h("div", null, h("div", { class: "form-grid" },
-    field("Name", name), ...entryFields, h("label"), dynamic, ...timeoutFields, field("Comment", comment)), err), [
+    field("Name", name), ...field("Kind", kind), ...entryFields, ...timeoutFields, ...jarlFields, field("Comment", comment)), err), [
     { label: "Cancel", value: null },
     { label: s.id ? "Save" : "Add set", kind: "primary", onclick: async () => {
       mount(err);
       const t = parseSeconds(timeout.value);
       if (t === null) { mount(err, h("div", { class: "msg err" }, "Write the timeout as 1h, 30m or 1d.")); return false; }
+      const k = kind.value;
       try {
-        await change(s.id ? "PATCH" : "POST", s.id ? "/sets/" + s.id : "/sets", { name: name.value.trim(), entries: dynamic.input.checked ? [] : list.value(), dynamic: dynamic.input.checked,
-          timeout: dynamic.input.checked ? t : 0, comment: comment.value.trim() });
+        await change(s.id ? "PATCH" : "POST", s.id ? "/sets/" + s.id : "/sets", { name: name.value.trim(), entries: k === "list" ? list.value() : [], dynamic: k === "dynamic",
+          timeout: k === "dynamic" ? t : 0, jarl: k === "jarl" ? { names: names.value().map(parseJarlName), within: within.value() } : null, comment: comment.value.trim() });
         rerender();
         return true;
       } catch (e) { mount(err, errorBox(e)); return false; }
@@ -61,6 +83,44 @@ async function setDialog(s) {
   ], { wide: true, sticky: true });
 }
 
+// jarlStatus shows what a Jarl set holds: each name's addresses in Jarl,
+// used or left out (and why).
+async function jarlStatus(s) {
+  const body = h("div");
+  const path = "/sets/" + encodeURIComponent(s.name) + "/jarl";
+  const draw = (js) => {
+    const rows = [];
+    for (const n of js.names) {
+      // A new node for each row: a node can only be in one place.
+      const label = () => [h("span", { class: "mono" }, n.name), n.chain && n.chain.length ? h("span", { class: "muted small" }, " → " + n.chain.join(" → ")) : null];
+      const view = n.view || n.found_view || "";
+      if (n.problem) rows.push({ label, view, address: "", used: h("span", null, badge("no addresses", "err"), " " + n.problem) });
+      else if (!n.addresses.length) rows.push({ label, view, address: "", used: n.error ? "not read: " + n.error : "not read yet" });
+      for (const a of n.addresses) rows.push({ label, view, address: a.address, used: a.used ? badge("used", "ok") : h("span", null, badge("left out", "warn"), " " + a.why) });
+      if (n.error && n.addresses.length) rows.push({ label, view, address: "", used: h("span", { class: "muted" }, "The last read failed (" + n.error + "): these are from " + (n.checked ? fmtTime(n.checked) : "before") + ".") });
+    }
+    mount(body,
+      !js.configured ? h("div", { class: "msg warn" }, "Jarl isn't configured (jarl.server in housecarl.yaml): the set keeps the addresses it last had.") : null,
+      js.error ? h("div", { class: "msg warn" }, "Reading Jarl failed: " + js.error + ". The set keeps the addresses it had.") : null,
+      h("p", null, "Holds ", h("span", { class: "mono" }, js.entries.length ? js.entries.join(", ") : "nothing"), " · within " + js.within.join(", "),
+        js.read ? h("span", { class: "muted" }, " · Jarl read " + fmtTime(js.read)) : null),
+      table([
+        { label: "Name", render: (r) => r.label() },
+        { label: "View", render: (r) => r.view },
+        { label: "Address", render: (r) => h("span", { class: "mono" }, r.address) },
+        { label: "", render: (r) => r.used },
+      ], rows, { empty: "No names." }));
+  };
+  draw(await get(path));
+  await modal("Addresses of " + s.name, body, [
+    { label: "Read Jarl now", onclick: async () => {
+      try { draw(await api("POST", path + "/refresh")); } catch (x) { toast(x.message, "err"); }
+      return false;
+    } },
+    { label: "Close", value: null },
+  ], { wide: true });
+}
+
 // entries shows and changes a dynamic set's entries.
 async function entries(s) {
   const body = h("div");

internal/web/static/assets/pages/stats.js

@@ -3,6 +3,7 @@
 import { h, mount, fmtTime, errorBox } from "../ui.js";
 import { get } from "../api.js";
 import { lineChart, chartCard, legend, timeTable, heatmap, heatmapTable, barList, compact, stepSeconds, endLabelWidth } from "../charts.js";
+import { withNames } from "../widgets.js";
 
 const ranges = [["1h", "1 hour"], ["6h", "6 hours"], ["24h", "24 hours"], ["7d", "7 days"], ["30d", "30 days"], ["90d", "90 days"], ["365d", "a year"]];
 const rangeSecs = { "1h": 3600, "6h": 6 * 3600, "24h": 86400, "7d": 7 * 86400, "30d": 30 * 86400, "90d": 90 * 86400, "365d": 365 * 86400 };
@@ -103,7 +104,7 @@ export async function render(el, params, query) {
     listCard("What they tried", "the logged drops' protocol and port", barList(s.blocked_ports, { empty: "No logged drops " + rangeLabel + "." })),
     listCard("Devices, received", "bytes from external zones, by inside address (IPv6 per /64)", s.devices_down.length ? barList(s.devices_down, { format: bytes, href: connHref }) : devHint),
     listCard("Devices, sent", "bytes to external zones", s.devices_up.length ? barList(s.devices_up, { format: bytes, href: connHref }) : devHint.cloneNode(true)),
-    d.quotas.length ? listCard("Quotas", "bytes counted against each rule's quota, " + rangeLabel, barList(d.quotas, { format: bytes, label: (k) => "rule #" + k.slice(1), href: () => "#/rules" })) : null,
+    d.quotas.length ? listCard("Quotas", "bytes counted against each rule's quota, " + rangeLabel, barList(d.quotas, { format: bytes, label: (k) => (d.hits.find((x) => x.key === k) || {}).name || "rule #" + k.slice(1), href: ruleHref, share: false })) : null,
     listCard("Rules that matched nothing", "in the last 30 days (or since statistics started): candidates to remove",
       unused.length ? h("div", null, h("ul", { class: "plain-list" }, unused.slice(0, 12).map((e) => h("li", null, h("a", { href: ruleHref(e.key) }, e.name || e.key)))),
         unused.length > 12 ? h("div", { class: "muted small" }, "and " + (unused.length - 12) + " more: hc stats rules --unused") : null) : h("div", { class: "empty" }, "Every rule matched something."))));
@@ -142,6 +143,7 @@ async function loadAll(since, heatSince) {
     get("/stats/timeline", { since, keys: "g:conntrack,g:conntrack_max,g:mem,g:rss,g:load,g:cpu" }),
     get("/stats/timeline", { since, keys: "quota:*" }),
   ]);
+  await withNames(summary.devices_down, summary.devices_up, summary.blocked_sources);
   return { summary, zones, traffic, drops, heat, hits, gauges,
     quotas: quotas.series.map((x) => ({ key: x.key.slice(6), count: x.values.reduce((a, v) => a + Math.max(v, 0), 0) })).filter((e) => e.count > 0).sort((a, b) => b.count - a.count) };
 }
@@ -180,7 +182,7 @@ function rangeRow(since) {
 // ruleHref: a counter's mark to its page ("r12" → the rules, "b-…" → the
 // built-ins under Settings).
 function ruleHref(mark) {
-  if (/^r\d/.test(mark)) return "#/rules";
+  if (/^r\d+$/.test(mark)) return "#/rules?rule=" + mark.slice(1);
   if (mark.startsWith("b-") || mark.startsWith("p-")) return "#/settings";
   if (mark.startsWith("f")) return "#/nat";
   return null;

internal/web/static/assets/pages/trace.js

@@ -60,7 +60,7 @@ export async function render(el, params, query) {
         h("strong", null, p.would_drop.label || [p.would_drop.chain, p.would_drop.mark].filter(Boolean).join(" "))) : null,
       h("table", { class: "trace-steps" }, h("tbody", null, p.steps.map((s) => h("tr", { class: /^(drop|reject)/.test(s.verdict) || /\[would (drop|reject)\]/.test(s.rule || "") ? "step-drop" : s.verdict === "accept" ? "step-accept" : "" },
         h("td", { class: "muted small" }, s.table + " " + s.chain),
-        h("td", null, s.label ? (s.mark && s.mark.startsWith("r") ? h("a", { href: "#/rules?chain=" + s.chain }, s.label) : s.label)
+        h("td", null, s.label ? (s.mark && s.mark.startsWith("r") ? h("a", { href: "#/rules?chain=" + s.chain + "&rule=" + s.mark.slice(1).split("-")[0] }, s.label) : s.label)
           : s.kind === "policy" ? s.chain + " policy" : h("span", { class: "mono small" }, s.rule)),
         h("td", { class: "small" }, s.verdict))))));
   }

internal/web/static/assets/pages/users.js

@@ -1,6 +1,6 @@
 // Users and everyone's tokens (administrators).
 import { h, mount, table, time, fmtTime, modal, input, field, checkbox, select, errorBox, confirmDialog, toast, badge, copyBox } from "../ui.js";
-import { get, api, catalog } from "../api.js";
+import { get, api, catalog, can } from "../api.js";
 import { rerender } from "../app.js";
 
 export async function render(el) {
@@ -16,6 +16,7 @@ export async function render(el) {
       { label: "Last login", render: (u) => u.last_login_at ? time(u.last_login_at) : "never" },
       { label: "Comment", render: (u) => u.comment },
       { label: "", tdClass: "actions-cell", render: (u) => [
+        h("button", { class: "small reveal", onclick: () => tokenDialog(cat, u) }, "New token"), " ",
         h("button", { class: "small reveal", onclick: () => userDialog(u, cat) }, "Edit"), " ",
         h("button", { class: "small reveal", onclick: () => del(u) }, "Delete")] },
     ], users)),
@@ -32,6 +33,42 @@ export async function render(el) {
     ], tokens, { empty: "No tokens." })));
 }
 
+// tokenDialog makes an API token: the viewer's own, or (administrators)
+// another user's. It shows the secret once.
+export async function tokenDialog(cat, user) {
+  const name = input({ placeholder: "laptop, backup script…" });
+  // Only roles within what the user may do: a token can never do more
+  // than its user, so offering more would only mislead.
+  const may = (res, write) => {
+    if (!user) return can(res, write);
+    if (user.admin) return true;
+    const gs = user.grant_strings || [];
+    return gs.includes(res + ":write") || !write && gs.includes(res + ":read");
+  };
+  const roles = Object.keys(cat.roles).filter((r) => cat.roles[r].every((g) => {
+    const [res, acc] = g.split(":");
+    return may(res, acc === "write");
+  }));
+  const role = select([["", user ? "everything " + user.username + " may do" : "everything you may do"], ...roles.map((r) => [r, r + ": " + cat.roles[r].join(" ")])], "");
+  const expires = select([["", "never"], ["30d", "30 days"], ["90d", "90 days"], ["365d", "a year"]], "90d");
+  const err = h("div");
+  await modal(user ? "New API token for " + user.username : "New API token", h("div", null, h("div", { class: "form-grid" }, field("Name", name), field("May do", role), field("Expires", expires)), err), [
+    { label: "Cancel", value: null },
+    { label: "Create", kind: "primary", onclick: async () => {
+      mount(err);
+      try {
+        const t = await api("POST", user ? "/users/" + user.id + "/tokens" : "/me/tokens", { body: { name: name.value.trim(), role: role.value || undefined, expires_in: expires.value || undefined } });
+        await modal("Token created", h("div", null, h("p", null, "Copy it now: it is not shown again." + (user ? " Give it to " + user.username + "; 'hc config set token' sets it in the CLI." : "")), copyBox(t.secret)));
+        rerender();
+        return true;
+      } catch (e) {
+        mount(err, errorBox(e));
+        return false;
+      }
+    } },
+  ]);
+}
+
 // rotateDialog gives a token a new secret. It keeps its name, ID and
 // permissions; only the programs that use it need the new secret.
 export async function rotateDialog(t) {

internal/web/static/assets/style.css

@@ -85,6 +85,7 @@ h1 { font-size: 20px; margin: 0 0 4px; }
 h2 { font-size: 16px; margin: 18px 0 8px; }
 h3 { font-size: 14px; margin: 14px 0 6px; }
 .muted { color: var(--muted); }
+.host-name { font-weight: 600; }
 .small { font-size: 12px; }
 .nowrap { white-space: nowrap; }
 .warn-text { color: var(--warn); }
@@ -378,6 +379,10 @@ pre.wrap { white-space: pre-wrap; word-break: break-all; font-size: 12px; }
 .list-rows { display: flex; flex-direction: column; gap: 6px; margin-bottom: 6px; }
 .list-row { display: flex; gap: 6px; align-items: center; }
 .list-row input { width: 26em; max-width: 100%; }
+.negatable { display: flex; gap: 8px; align-items: flex-start; flex-wrap: wrap; }
+.negatable > .list-editor { flex: 1; min-width: 0; }
+.negatable.negated > select { color: var(--err); border-color: var(--err); font-weight: 600; }
+.negatable.negated .list-rows { border-left: 3px solid var(--err); padding-left: 8px; }
 input.short { width: 7em; }
 .builtins { margin-bottom: 10px; line-height: 1.6; }
 .policy { margin-top: 10px; }
@@ -408,6 +413,7 @@ input.wide { width: 100%; }
 .diff .add { background: var(--add); color: var(--add-text); }
 .diff .del { background: var(--del); color: var(--del-text); }
 .diff .hunk { background: var(--hunk); color: var(--accent); }
+.diff .hunk .block { font-weight: 700; color: var(--text); }
 .diff .file { font-weight: 700; padding-top: 6px; }
 select.inline { width: auto; display: inline-block; }
 /* The rule dialog's optional parts: "+" buttons, and ✕ to close one. */
@@ -425,10 +431,18 @@ table.matrix th, table.matrix td { text-align: center; }
 table.matrix tbody th { text-align: left; }
 table.matrix th.corner { font-weight: 400; color: var(--muted); text-transform: none; }
 table.matrix td { padding: 4px; }
-.matrix-cell { width: 100%; min-width: 7em; border: 0; background: transparent; color: inherit; font-weight: 600; padding: 6px 8px; cursor: pointer; }
+table.matrix { table-layout: fixed; width: 100%; min-width: 640px; }
+table.matrix thead th:first-child, table.matrix tbody th { width: 8em; }
+.matrix-cell { display: block; width: 100%; min-width: 7em; border: 0; background: transparent; color: inherit; font-weight: 600; padding: 6px 8px; cursor: pointer; white-space: normal; text-align: center; }
 td.matrix-allowed { background: var(--add); color: var(--add-text); }
 td.matrix-blocked { background: var(--del); color: var(--del-text); }
-.matrix-n { margin-left: 6px; font-weight: 400; font-size: 12px; color: var(--warn); }
+.matrix-n { margin-left: 6px; font-weight: 400; font-size: 12px; }
+td.matrix-partly { background: var(--warn-soft); color: var(--text); }
+td.matrix-same { opacity: 0.55; }
+/* The rule a link pointed at (?rule=ID). */
+tr.row-target td { background: var(--accent-soft); font-weight: 600; }
+tr.row-target td:first-child { box-shadow: inset 3px 0 0 var(--accent); }
+.matrix-open { display: block; font-weight: 400; font-size: 12px; opacity: 0.85; margin-top: 2px; }
 td.matrix-none { color: var(--muted); }
 tr.matrix-rest td { border-top: 2px solid var(--border); }
 

internal/web/static/assets/ui.js

@@ -200,7 +200,12 @@ export function diffView(text) {
     if (line.startsWith("+++") || line.startsWith("---")) cls = "file";
     else if (line.startsWith("+")) cls = "add";
     else if (line.startsWith("-")) cls = "del";
-    else if (line.startsWith("@@")) cls = "hunk";
+    else if (line.startsWith("@@")) {
+      // "@@ -a,b +c,d @@ chain forward": the chain the hunk is in.
+      const m = line.match(/^(@@ .*? @@)(?: (.+))?$/);
+      box.append(h("div", { class: "hunk" }, m ? [m[1], m[2] ? [" ", h("span", { class: "block" }, m[2])] : null] : line));
+      continue;
+    }
     box.append(h("div", { class: cls }, line || " "));
   }
   return box;

internal/web/static/assets/widgets.js

@@ -1,7 +1,7 @@
 // Widgets shared by several pages: list editors with suggestions, the
 // match editor of rules and NAT, descriptions, hit counts, durations.
-import { h, input, select, field, checkbox } from "./ui.js";
-import { get } from "./api.js";
+import { h, input, select, field } from "./ui.js";
+import { get, api } from "./api.js";
 
 // ---- durations
 
@@ -65,44 +65,76 @@ export function listEditor(values, opts = {}) {
 
 // ---- matches
 
+// negatable puts "any of" / "any but" in front of a list editor, so a
+// field says first whether it matches its entries or everything else;
+// "any but" marks the list. The choice shows once the list has a row
+// (empty is "any"), and an empty list is never negated. value() is the
+// list, negated() the choice.
+function negatable(list, not) {
+  const mode = select([["", "any of"], ["not", "any but"]], not ? "not" : "", { class: "inline" });
+  const box = h("div", { class: "negatable" }, mode, list);
+  const rows = () => list.querySelector(".list-rows").children.length;
+  const update = () => {
+    mode.classList.toggle("hidden", rows() === 0);
+    box.classList.toggle("negated", mode.value === "not" && rows() > 0);
+  };
+  mode.addEventListener("change", update);
+  // Add and remove act on their own click first; this runs after.
+  list.addEventListener("click", update);
+  update();
+  box.value = list.value;
+  box.negated = () => mode.value === "not" && list.value().length > 0;
+  return box;
+}
+
 // matchEditor edits what a rule, source NAT or redirect matches. It
 // returns the form-grid fields; value() is the match's fields.
 export function matchEditor(m, n, opts = {}) {
   m = m || {};
   const zones = (list) => listEditor(list, { suggestions: n.zones, placeholder: "zone", mono: false, addLabel: "Add zone" });
   const addrs = (list) => listEditor(list, { suggestions: n.sets, placeholder: "a set, 192.168.1.0/24, 2001:db8:1::/64, 192.168.1.100-192.168.1.199", addLabel: "Add" });
-  const inZ = zones(m.in_zones), outZ = zones(m.out_zones);
-  const notIn = checkbox("any zone but these", m.not_in), notOut = checkbox("any zone but these", m.not_out);
-  const src = addrs(m.sources), dst = addrs(m.destinations);
-  const notSrc = checkbox("any source but these", m.not_sources), notDst = checkbox("any destination but these", m.not_destinations);
+  const inZ = negatable(zones(m.in_zones), m.not_in), outZ = negatable(zones(m.out_zones), m.not_out);
+  const src = negatable(addrs(m.sources), m.not_sources), dst = negatable(addrs(m.destinations), m.not_destinations);
   const svc = listEditor(m.services, { suggestions: n.services, placeholder: "ssh, https, tcp/8080, udp/1000-2000, icmp/echo-request", addLabel: "Add service" });
   const fam = select([["", "IPv4 and IPv6"], ["ipv4", "IPv4 only"], ["ipv6", "IPv6 only"]], m.family || "");
+  const inField = opts.in !== false ? field("Coming in on", inZ) : null;
+  const outField = opts.out !== false ? field("Going out on", outZ) : null;
   const fields = [
-    opts.in !== false ? field("Coming in on", h("div", null, inZ, notIn)) : null,
-    opts.out !== false ? field("Going out on", h("div", null, outZ, notOut)) : null,
-    field("From", h("div", null, src, notSrc), "Sets, addresses, prefixes or ranges, IPv4 and IPv6 mixed. Empty: any."),
-    field("To", h("div", null, dst, notDst)),
+    inField,
+    outField,
+    field("From", src, "Sets, addresses, prefixes or ranges, IPv4 and IPv6 mixed. Empty: any."),
+    field("To", dst),
     field("Services", svc, "Named services (built in, or yours) or entries such as tcp/8080. Empty: any traffic."),
     field("Family", fam),
   ];
   fields.value = () => {
-    const v = { sources: src.value(), not_sources: notSrc.input.checked, destinations: dst.value(), not_destinations: notDst.input.checked,
+    const v = { sources: src.value(), not_sources: src.negated(), destinations: dst.value(), not_destinations: dst.negated(),
       services: svc.value(), family: fam.value };
-    if (opts.in !== false) Object.assign(v, { in_zones: inZ.value(), not_in: notIn.input.checked });
-    if (opts.out !== false) Object.assign(v, { out_zones: outZ.value(), not_out: notOut.input.checked });
+    // A hidden zone field (the chain has no such interface) matches nothing.
+    if (inField) Object.assign(v, inField[1].classList.contains("hidden") ? { in_zones: [], not_in: false } : { in_zones: inZ.value(), not_in: inZ.negated() });
+    if (outField) Object.assign(v, outField[1].classList.contains("hidden") ? { out_zones: [], not_out: false } : { out_zones: outZ.value(), not_out: outZ.negated() });
     return v;
   };
+  // zones shows the zone fields a chain can use: input and early have no
+  // outgoing interface, output no incoming one.
+  const show = (f, on) => f && f.filter(Boolean).forEach((e) => e.classList.toggle("hidden", !on));
+  fields.zones = (inOn, outOn) => { show(inField, inOn); show(outField, outOn); };
   return fields;
 }
 
 // describe sums up a match: "in lan · from trusted · ssh, dns".
 export function describe(m) {
   const parts = [];
-  const side = (word, not, list) => { if (list && list.length) parts.push(word + (not ? " not " : " ") + list.join(", ")); };
-  side("in", m.not_in, m.in_zones);
-  side("out", m.not_out, m.out_zones);
-  side("from", m.not_sources, m.sources);
-  side("to", m.not_destinations, m.destinations);
+  const list = (not, xs) => (not ? "any but " : "") + xs.join(", ");
+  // Zones are a direction, "lan → wan"; the firewall itself is the other
+  // end of the input and output chains.
+  const ins = m.in_zones || [], outs = m.out_zones || [];
+  if (ins.length || outs.length) {
+    parts.push((m.chain === "output" ? "firewall" : ins.length ? list(m.not_in, ins) : "any") + " → " +
+      (m.chain === "input" ? "firewall" : outs.length ? list(m.not_out, outs) : "any"));
+  }
+  if (m.sources && m.sources.length) parts.push("from " + list(m.not_sources, m.sources));
+  if (m.destinations && m.destinations.length) parts.push("to " + list(m.not_destinations, m.destinations));
   if (m.services && m.services.length) parts.push(m.services.join(", "));
   if (m.family) parts.push(m.family + " only");
   return parts.length ? parts.join(" · ") : "everything";
@@ -156,6 +188,41 @@ export function fmtBytes(n) {
   return n + " bytes";
 }
 
+// pct writes used as a share of total: "25%", "<1%" for a little.
+export function pct(used, total) {
+  if (!total || used <= 0) return "0%";
+  const p = used / total * 100;
+  return p < 1 ? "<1%" : Math.floor(p) + "%";
+}
+
+// usageBar draws used out of total as a bar, red once it is all used.
+export function usageBar(used, total) {
+  const seg = h("div", { class: "seg leased" });
+  seg.style.width = Math.min(100, used / total * 100) + "%";
+  return h("div", { class: "usage" }, h("div", { class: "usage-bar" + (used >= total ? " full" : "") }, seg));
+}
+
+// lookupNames asks for inside addresses' names (docs/configuration.md):
+// {address: name}, {} when names are off or can't be had.
+export async function lookupNames(addrs) {
+  const list = [...new Set(addrs.filter(Boolean))];
+  if (!list.length) return {};
+  try { return (await api("POST", "/names", { body: { addresses: list } })).names || {}; } catch { return {}; }
+}
+
+// named shows an address (or text with it, such as address:port) after
+// its name's first label; the whole name is in the tooltip.
+export function named(names, addr, text = addr) {
+  const n = names[addr];
+  return n ? h("span", { title: n + " (" + addr + ")" }, h("span", { class: "host-name" }, n.split(".")[0]), " ", h("span", { class: "muted" }, text)) : text;
+}
+
+// withNames sets each top-list entry's name from its key (an address).
+export async function withNames(...lists) {
+  const names = await lookupNames(lists.flat().map((e) => e.key));
+  for (const e of lists.flat()) if (names[e.key]) e.name = names[e.key].split(".")[0];
+}
+
 // quotas loads what the rules' quotas used, by rule ID ({} without
 // log:read).
 export async function quotas() {

scripts/e2e.sh

@@ -20,7 +20,8 @@ IMAGE=${E2E_IMAGE:-housecarl-nft}
 WORK=${WORK:-$(mktemp -d "${TMPDIR:-/tmp}/housecarl-e2e.XXXXXX")}
 docker info >/dev/null 2>&1 || { echo "Docker isn't reachable (set DOCKER_HOST?)"; exit 2; }
 
-(cd "$ROOT" && CGO_ENABLED=0 go build -o "$WORK/housecarld" ./cmd/housecarld && CGO_ENABLED=0 go build -o "$WORK/hc" ./cmd/hc) || exit 1
+(cd "$ROOT" && CGO_ENABLED=0 go build -o "$WORK/housecarld" ./cmd/housecarld && CGO_ENABLED=0 go build -o "$WORK/hc" ./cmd/hc &&
+	CGO_ENABLED=0 go build -o "$WORK/fakejarl" ./scripts/fakejarl) || exit 1
 # The image: Debian 13 with nftables and network tools. 'docker build'
 # can't reach the network on some hosts, so it is made with run + commit.
 if ! docker image inspect "$IMAGE" >/dev/null 2>&1; then
@@ -55,6 +56,9 @@ docker run -d --name ${P}-router --hostname router --cap-add NET_ADMIN $sysctls
 	--network ${P}-wan --ip $WAN4 --ip6 $WAN6 -v "$WORK:/w" "$IMAGE" sleep infinity >/dev/null || exit 1
 docker network connect --ip $LAN4 --ip6 $LAN6 ${P}-lan ${P}-router || exit 1
 docker network connect --ip 10.88.50.1 ${P}-wg ${P}-router || exit 1
+# The client has a name for housecarld's reverse lookups (/etc/hosts
+# here, a PTR record in real life); the addresses outside get none.
+docker exec ${P}-router sh -c "echo '$CLIENT4 e2e-client.lab' >> /etc/hosts" || exit 1
 # The router's interfaces get the names of the real one: wan, enp2s0, wg0
 # (attached in that order: eth0, eth1, eth2).
 docker exec ${P}-router sh -c 'for p in eth0:wan eth1:enp2s0 eth2:wg0; do i=${p%:*} n=${p#*:}; ip link set $i down && ip link set $i name $n && ip link set $n up; done
@@ -101,6 +105,7 @@ ruleset: /w/data/ruleset.nft
 backup: {dir: /w/backups}
 log: {level: debug}
 stats: {database: /w/data/stats.db}
+jarl: {server: "http://127.0.0.1:8053", token: e2e-jarl-token, refresh: 10s}
 EOF
 { cat "$WORK/housecarl.yaml"; echo "shadow: {enabled: true}"; } > "$WORK/housecarl-shadow.yaml"
 CONF=housecarl.yaml
@@ -319,28 +324,52 @@ send 2000000 >/dev/null 2>&1
 run "used up: the device is cut off" 1 send 1000
 run "the usage" 0 H quotas
 contains "e2e quota.*1.0 MB each.*by hand"
-contains "$CLIENT4  *1\.[0-9] MB"
+contains "$CLIENT4 (e2e-client)  *1\.[0-9] MB (1[0-9][0-9]%)"
 stop; start
 run "after a restart, still used up" 1 send 1000
 run "the usage after a restart" 0 H quotas
-contains "$CLIENT4  *1\.[0-9] MB"
+contains "$CLIENT4 (e2e-client)  *1\.[0-9] MB"
+# A top-up: some given back (more than the cut-off packets added), then
+# used up again; one address started again; then the whole quota.
+run "a top-up for the device" 0 H rule reset-quota "$QR" --give 10mbytes --address $CLIENT4
+contains "gave back 10.0 MB"
+run "topped up: the device is back" 0 send 1000
+send 30000000 >/dev/null 2>&1
+run "used up again" 1 send 1000
+run "an address that used nothing" 4 H rule reset-quota "$QR" --address 10.88.10.99
+run "one address started again" 0 H rule reset-quota "$QR" --address $CLIENT4
+run "back again" 0 send 1000
 run "reset by hand" 0 H rule reset-quota "$QR"
 run "the device is back" 0 send 1000
 run "the reset is audited" 0 H audit --action quota.
 contains "quota.reset"
+contains "quota.give"
+# Counted in total now: what the device used carries over; per
+# destination can't take it, and says so.
+run "within the quota" 0 send 300000
+run "to one total" 0 H rule update "$QR" --quota 1mbytes,over
+not_contains "quota_restarts"
+run "the total carried over" 0 H quotas
+contains "e2e quota)  *[0-9.]* KB ([0-9]*%)"
+run "per destination starts again" 0 H rule update "$QR" --quota 1mbytes,over,per-destination
+contains "quota_restarts"
 run "the quota rule goes" 0 H rule delete -y "$QR"
 
 # ---- the zone matrix, of the imported ruleset
 
 run "the matrix" 0 H matrix
 contains "^firewall  *allow"
+contains "^dhcp  *partly +[0-9]"
+contains "dhcp → wan  *.*from trusted_ips"
 run "LAN to the internet" 0 H matrix dhcp wan
-contains "allowed  *from trusted_ips  *rule forward #[0-9]* (Forward from trusted IPs)"
-contains "blocked  *the rest  *forward policy"
+contains "new connections: partly allowed"
+contains "allowed  *from trusted_ips  *rule forward #[0-9]* (Forward from trusted IPs)  *[0-9]"
+contains "blocked  *the rest  *forward policy  *[0-9]"
 not_contains "wg0_net"
 run "the internet to the firewall" 0 H matrix wan firewall
 contains "blocked  *sources that can't come from outside"
 contains "allowed  *udp/51820"
+contains "allowed  *raw: icmpv6 type"
 
 # ---- statistics (sampled every 3 seconds here)
 
@@ -358,7 +387,8 @@ contains "Dropped:  *[1-9]"
 run "traffic per zone over time" 0 H stats traffic --since 1h --step 1m
 contains "wan ↓"
 run "the devices" 0 H stats top devices --since 1h
-contains "^$CLIENT4  *[0-9.]* KB  *[0-9.]* KB"
+contains "^$CLIENT4 (e2e-client)  *[0-9.]* KB  *[0-9.]* KB"
+run "each device once" 0 sh -c "docker exec ${P}-router /w/hc stats top devices --since 1h | grep -c '^$CLIENT4 ' | grep -qx 1"
 run "the sources blocked" 0 H stats top blocked --since 1h
 contains "^$NET4  *[1-9]"
 run "what they tried" 0 H stats top tried --since 1h
@@ -375,6 +405,8 @@ contains "^[0-9-]* [0-9:]*  *[0-9]*  *[0-9]*"
 docker exec -d ${P}-client sh -c "sleep 30 | nc $NET4 9000"
 sleep 1
 run "the connection is tracked" 0 H connections --search "$CLIENT4 :9000"
+contains "$CLIENT4:[0-9]* (e2e-client)  *$NET4:9000  *as $WAN4"
+run "without names" 0 H connections --search "$CLIENT4 :9000" --no-names
 contains "$CLIENT4:[0-9]*  *$NET4:9000  *as $WAN4"
 run "closed" 0 H connections close --search "$CLIENT4 :9000" -y
 contains "closed [1-9][0-9]* connection"
@@ -450,6 +482,96 @@ run "the VLAN rule goes" 0 H rule delete -y "$VR"
 run "the VLAN zone goes" 0 H zone delete -y iot
 R ip link del enp2s0.30
 
+# ---- ban lists: bans kept from the firewall, a host, or everything
+
+# DNS is open to the internet on the router (tcp/53): a listener answers.
+docker exec -d ${P}-router sh -c 'while [ ! -f /tmp/nodns ]; do echo dns | nc -N -l 0.0.0.0 53; done'
+sleep 1
+run "the router's tcp/53 from the internet" 0 connect net $WAN4 53
+contains "^dns$"
+run "a ban list for the firewall" 0 H banlist add router --scope firewall
+# The lab's internet host shares the router's WAN /64: ban IPv6 addresses
+# alone (a /64 would hold the router's own, and is refused).
+run "a ban list for jellyfin" 0 H banlist add jf --scope hosts --host $JF4 --host $JF6 --group-v6 128
+run "a ban list for everything" 0 H banlist add edge --scope everything --max-time 1h
+run "the lists" 0 H banlist list
+contains "jf  *hosts  *10.88.10.57, 2001:db8:7f3d:10::57  *0"
+# The firewall's own DNS, for the internet host.
+run "ban from the firewall's tcp/53" 0 H ban router $NET4 --tcp dns --reason "e2e"
+contains "banned $NET4, tcp/53, in router"
+run "the router's DNS is cut for it" 1 connect net $WAN4 53
+run "the port forward isn't (scope firewall)" 0 connect net $WAN4 8096
+contains "^jellyfin$"
+run "the ban in the ruleset" 0 R nft list ruleset
+contains "ip saddr . meta l4proto . th dport @ban_[0-9]*_v4_svc counter packets [1-9]"
+run "lift it" 0 H unban router $NET4
+contains "1 bans lifted"
+run "DNS again" 0 connect net $WAN4 53
+contains "^dns$"
+# fail2ban on jellyfin, with Housecarl's action and a token for its list.
+run "a user for jellyfin's fail2ban" 0 H user add f2b-jf --no-password --grant bans:write:jf
+R sh -c "/w/hc token create jf --user f2b-jf > /w/f2b.token 2>/dev/null"
+run "its token" 0 test -s "$WORK/f2b.token"
+# f2b ACTION ip=… port=…: the action's command from contrib/, with the
+# jail's values, as fail2ban runs it (on jellyfin).
+f2b() {
+	local conf="$ROOT/contrib/fail2ban/action.d/housecarl.conf" a=$1; shift
+	local cmd curl
+	cmd=$(awk -v a="$a" '$0 ~ "^"a" *=" {sub(/^[^=]*= */,""); print; on=1; next} on && /^[ \t]/ {sub(/^[ \t]+/,""); print; next} {on=0}' "$conf" | tr '\n' ' ')
+	curl=$(sed -n 's/^_curl *= *//p' "$conf")
+	cmd=${cmd//<_curl>/$curl}
+	local kv
+	for kv in "$@" "list=jf" "url=http://$LAN4:8070" "tokenfile=/w/f2b.token" "curlopts=" "protocol=tcp" "bantime=600" "name=jellyfin"; do
+		cmd=${cmd//<${kv%%=*}>/${kv#*=}}
+	done
+	docker exec ${P}-jf sh -c "$cmd"
+}
+run "fail2ban bans the internet host's https" 0 f2b actionban ip=$NET4 port=https
+run "the port forward to jellyfin is cut for it" 1 connect net $WAN4 8096
+run "the router's DNS isn't (scope hosts)" 0 connect net $WAN4 53
+run "fail2ban bans its IPv6 address" 0 f2b actionban ip=$NET6 port=https
+run "IPv6 to jellyfin's 443 is cut" 1 connect net $JF6 443
+run "the bans" 0 H bans jf
+contains "$NET4  *tcp/443 .*f2b-jf  *fail2ban/jellyfin"
+contains "$NET6  *tcp/443"
+run "never the inside" 22 f2b actionban ip=$CLIENT4 port=https
+run "refused, audited" 0 H audit --action ban.add
+contains "failure.*inside"
+run "fail2ban unbans" 0 f2b actionunban ip=$NET4
+run "the port forward works again" 0 connect net $WAN4 8096
+contains "^jellyfin$"
+run "unbanning what Housecarl already let go is no error" 0 f2b actionunban ip=$NET4
+run "and the IPv6 ban" 0 f2b actionunban ip=$NET6
+run "jellyfin by IPv6 again" 0 connect net $JF6 443
+contains "jellyfin6"
+run "the token can't ban elsewhere" 22 f2b actionban ip=$NET4 port=https list=router
+# Everything, cutting a connection that is open, and kept over a restart.
+R touch /tmp/nodns
+connect net $WAN4 53 >/dev/null 2>&1
+docker exec -d ${P}-router sh -c 'nc -l 0.0.0.0 53 > /w/held.out'
+sleep 1
+docker exec -d ${P}-net sh -c "sleep 30 | nc $WAN4 53"
+sleep 1
+run "an open connection from the internet host" 0 H connections --search "$NET4 :53"
+contains "$NET4:[0-9]*  *$WAN4:53"
+run "ban it from everything" 0 H ban edge $NET4 --time 1d
+contains "banned $NET4, every port, in edge (ends in 1h)"
+contains "[1-9][0-9]* connections closed"
+run "its connection is gone" 0 H connections --search "$NET4 :53"
+not_contains ":53"
+run "nothing gets through for it" 1 connect net $WAN4 8096
+stop
+run "restart housecarld" 0 start
+run "the ban is back after the restart" 0 R nft list ruleset
+contains "$NET4 timeout [0-9hms]* expires"
+run "still nothing for it" 1 connect net $WAN4 8096
+run "lift it" 0 H unban edge $NET4
+run "the ban is out of the ruleset" 0 R nft list ruleset
+not_contains "$NET4 timeout"
+run "the port forward again" 0 connect net $WAN4 8096
+contains "^jellyfin$"
+run "the lists go" 0 sh -c "docker exec ${P}-router /w/hc banlist delete -y router && docker exec ${P}-router /w/hc banlist delete -y jf && docker exec ${P}-router /w/hc banlist delete -y edge"
+
 # ---- renaming a zone others refer to
 
 run "rename the imported dhcp zone" 0 H zone update dhcp --name lan
@@ -459,6 +581,77 @@ not_contains "dhcp "
 run "the ruleset is unchanged by it" 0 R nft list chain inet housecarl input
 contains 'iifname "enp2s0" udp dport 67'
 
+# ---- a set from Jarl: names' addresses, kept up to date
+
+# A fake Jarl on the router: example.com in views internal and external.
+# jf's AAAA is jellyfin's; ssh.example.com is a CNAME for it; the internet
+# host's address is outside the LAN.
+jarl_data() { # JF_AAAA
+	cat > "$WORK/jarl.json" <<EOJ
+{"zones": [{"id": 1, "name": "example.com.", "view": "internal", "type": "primary"},
+           {"id": 2, "name": "example.com.", "view": "external", "type": "primary"}],
+ "records": {"1": [{"name": "jf.example.com.", "type": "A", "data": "$JF4"},
+                   {"name": "jf.example.com.", "type": "AAAA", "data": "$1"},
+                   {"name": "ssh.example.com.", "type": "CNAME", "data": "jf.example.com."},
+                   {"name": "net.example.com.", "type": "AAAA", "data": "$NET6"}],
+             "2": [{"name": "ssh.example.com.", "type": "AAAA", "data": "$NET6"}]}}
+EOJ
+}
+jarl_data $JF6
+docker exec -d ${P}-router sh -c '/w/fakejarl -listen 127.0.0.1:8053 -data /w/jarl.json -token e2e-jarl-token >> /w/fakejarl.log 2>&1'
+sleep 1
+run "IPv6 ssh to jellyfin is dropped" 1 connect net $JF6 22
+run "a set from Jarl" 0 H set add jfssh --jarl ssh.example.com --within lan
+run "a name in two views needs its view" 0 H set jarl jfssh --refresh
+contains "in Jarl's views external, internal: name the view"
+run "name the views" 0 H set update jfssh --jarl ssh.example.com@internal --jarl net.example.com@internal
+JR=$(H -o id rule add forward --in wan --to jfssh --service ssh --first --comment "e2e jarl")
+run "the set's addresses, CNAME followed" 0 H set jarl jfssh --refresh
+contains "ssh.example.com → jf.example.com  *internal  *$JF4  *yes"
+contains "ssh.example.com → jf.example.com  *internal  *$JF6  *yes"
+contains "net.example.com  *internal  *$NET6  *no: not within lan"
+run "in the ruleset" 0 R nft list set inet housecarl jfssh_v6
+contains "$JF6"
+not_contains "$NET6"
+run "the address outside is warned of" 0 H status
+contains "jarl_outside"
+run "IPv6 ssh to jellyfin through the Jarl set" 0 connect net $JF6 22
+contains "^ssh$"
+# The record changes in Jarl: within the refresh, the set follows.
+jarl_data 2001:db8:7f3d:10::99
+sleep 12
+run "the new address, without a change in Housecarl" 0 R nft list set inet housecarl jfssh_v6
+contains "2001:db8:7f3d:10::99"
+not_contains "$JF6"
+run "ssh to the old address is dropped again" 1 connect net $JF6 22
+run "no history entry for it" 0 H history list
+contains "update set jfssh"
+not_contains "10::99"
+run "an audit record" 0 H audit --action set.jarl
+contains "added 2001:db8:7f3d:10::99"
+# Jarl goes away: the set keeps what it had, over a restart too.
+jarl_data $JF6
+H set jarl jfssh --refresh >/dev/null
+R sh -c 'kill $(pidof fakejarl)'
+run "Jarl down: the set keeps its addresses" 0 H set jarl jfssh --refresh
+contains "Reading Jarl failed"
+contains "$JF6  *yes"
+run "still through" 0 connect net $JF6 22
+contains "^ssh$"
+run "warned" 0 H status
+contains "jarl_unreachable"
+stop
+run "restart housecarld, Jarl still down" 0 start
+run "the set is back from the database" 0 R nft list set inet housecarl jfssh_v6
+contains "$JF6"
+run "the boot ruleset has its addresses" 0 R grep -q "$JF6" /w/data/ruleset.nft
+run "still through after the restart" 0 connect net $JF6 22
+contains "^ssh$"
+run "the Jarl rule goes" 0 H rule delete -y "$JR"
+run "the Jarl set goes" 0 H set delete -y jfssh
+run "no Jarl warning left" 0 H status
+not_contains "jarl_"
+
 # ---- restart and boot
 
 stop

scripts/fakejarl/main.go

@@ -0,0 +1,63 @@
+// Command fakejarl answers the part of Jarl's API that Housecarl's Jarl
+// sets read (GET /zones, GET /zones/{id}/records), from a JSON file read
+// again on each request, so the e2e test can change records:
+//
+//	{"zones": [{"id": 1, "name": "example.com.", "view": "internal", "type": "primary"}],
+//	 "records": {"1": [{"name": "nas.example.com.", "type": "A", "data": "10.0.0.5"}]}}
+//
+// Usage: fakejarl -listen 127.0.0.1:8053 -data jarl.json -token SECRET
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+)
+
+type data struct {
+	Zones   []map[string]any            `json:"zones"`
+	Records map[string][]map[string]any `json:"records"`
+}
+
+func main() {
+	listen := flag.String("listen", "127.0.0.1:8053", "address to listen on")
+	file := flag.String("data", "jarl.json", "the zones and records")
+	token := flag.String("token", "", "the API token Housecarl must send")
+	flag.Parse()
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Authorization") != "Bearer "+*token {
+			w.WriteHeader(http.StatusUnauthorized)
+			w.Write([]byte(`{"error": {"code": "unauthorized", "message": "bad token"}}`))
+			return
+		}
+		b, err := os.ReadFile(*file)
+		var d data
+		if err == nil {
+			err = json.Unmarshal(b, &d)
+		}
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		p := strings.TrimPrefix(r.URL.Path, "/api/v1")
+		switch {
+		case p == "/zones":
+			json.NewEncoder(w).Encode(d.Zones)
+		case strings.HasPrefix(p, "/zones/") && strings.HasSuffix(p, "/records"):
+			id := strings.TrimSuffix(strings.TrimPrefix(p, "/zones/"), "/records")
+			recs := d.Records[id]
+			if recs == nil {
+				recs = []map[string]any{}
+			}
+			json.NewEncoder(w).Encode(recs)
+		default:
+			w.WriteHeader(http.StatusNotFound)
+			w.Write([]byte(`{"error": {"code": "not_found", "message": "not found"}}`))
+		}
+	})
+	log.Fatal(http.ListenAndServe(*listen, nil))
+}

scripts/gitea-release.sh

@@ -114,7 +114,7 @@ done
 files="$files dist/SHA256SUMS"
 
 # The release (created, or found when publishing again).
-release=$(call 404 "$api/releases/tags/$tag")
+release=$(call 404 "$api/releases/tags/$(printf '%s' "$tag" | sed 's/+/%2B/g')")
 id=$(printf '%s\n' "$release" | jq -r '.id // empty')
 if [ -z "$id" ]; then
 	body=$(jq -n --arg tag "$tag" --arg notes "$notes" --argjson pre "$prerelease" \
@@ -127,7 +127,8 @@ for f in $files; do
 	name=${f#dist/}
 	old=$(printf '%s\n' "$release" | jq -r --arg n "$name" '.assets[]? | select(.name == $n) | .id')
 	[ -z "$old" ] || call "" -X DELETE "$api/releases/$id/assets/$old" >/dev/null
-	call "" -X POST -F "attachment=@$f" "$api/releases/$id/assets?name=$name" >/dev/null
+	# A + (build metadata, 0.2.0-rc.3+1a2b3c4) would be a space in a query.
+	call "" -X POST -F "attachment=@$f" "$api/releases/$id/assets?name=$(printf '%s' "$name" | sed 's/+/%2B/g')" >/dev/null
 	echo "gitea-release: attached $name"
 done