Merge branch 'totp'

Both branches added database migration 3: DNSSEC (merged first) keeps 3
and TOTP becomes migration 4.

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

internal/config/config.go

@@ -30,6 +30,7 @@ type Config struct {
 	StagingDir string  `yaml:"staging_dir"`
 	Log        Log     `yaml:"log"`
 	Session    Session `yaml:"session"`
+	TOTP       TOTP    `yaml:"totp"`
 	BIND       BIND    `yaml:"bind"`
 	Audit      Audit   `yaml:"audit"`
 	Backup     Backup  `yaml:"backup"`
@@ -150,6 +151,28 @@ type Session struct {
 }
 
 // BIND says where BIND's files and tools are.
+// TOTP configures two-factor login to the web UI (docs/permissions.md).
+type TOTP struct {
+	// Require is who must use it: none (each user decides), admins or
+	// all (every user who logs in with a password).
+	Require string `yaml:"require"`
+	// Issuer is the name authenticator apps show for the account ("" is
+	// "Jarl <hostname>").
+	Issuer string `yaml:"issuer"`
+}
+
+// IssuerName is Issuer, or "Jarl <short hostname>".
+func (t TOTP) IssuerName() string {
+	if t.Issuer != "" {
+		return t.Issuer
+	}
+	h, _ := os.Hostname()
+	if h, _, _ = strings.Cut(h, "."); h == "" {
+		return "Jarl"
+	}
+	return "Jarl " + h
+}
+
 type BIND struct {
 	MainConfig string `yaml:"main_config"`
 	ConfigDir  string `yaml:"config_dir"`
@@ -254,6 +277,7 @@ func Default() *Config {
 		StagingDir: "/var/lib/jarl/staging",
 		Log:        Log{Level: "info", Format: "text"},
 		Session:    Session{Lifetime: Duration(12 * time.Hour), IdleTimeout: Duration(2 * time.Hour), CookieSecure: "auto"},
+		TOTP:       TOTP{Require: "none"},
 		BIND: BIND{
 			MainConfig:     "/etc/bind/named.conf",
 			ConfigDir:      "/etc/bind/jarl",
@@ -328,6 +352,14 @@ func (c *Config) check() error {
 	default:
 		return fmt.Errorf("session.cookie_secure must be auto, always or never")
 	}
+	switch c.TOTP.Require {
+	case "none", "admins", "all":
+	default:
+		return fmt.Errorf("totp.require must be none, admins or all")
+	}
+	if len(c.TOTP.Issuer) > 64 || strings.ContainsAny(c.TOTP.Issuer, ":") {
+		return fmt.Errorf("totp.issuer must be at most 64 characters, without ':'")
+	}
 	if err := c.Stats.check(); err != nil {
 		return fmt.Errorf("stats: %w", err)
 	}
@@ -468,6 +500,15 @@ session:
   idle_timeout: 2h   # ...or after this long without activity
   cookie_secure: auto  # auto, always or never
 
+# Two-factor login to the web UI with an authenticator app (TOTP). Each
+# user can turn it on under Account. require makes it compulsory: none,
+# admins, or all (every user with a password). A user who must use it and
+# hasn't set it up can only set it up after logging in. API tokens and
+# the local socket are not affected. See docs/permissions.md.
+totp:
+  require: none
+  issuer: ""         # the name in the app; "" is "Jarl <hostname>"
+
 bind:
   # The file named loads. 'jarld adopt' makes it include Jarl's config.
   main_config: /etc/bind/named.conf