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Guard: watch logs, ban misbehaving addresses in Housecarl

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Files and the journal, patterns with one <IP>, bounties within a window,
bans in a Housecarl ban list with repeat offenders' bans growing; presets
for sshd, jarl, housecarl, steward, bind-xfr, postfix-sasl, dovecot,
nginx-auth and housecarl-drops; guard run/check/test/status/bans/ban/unban;
a Debian package with a sandboxed unit; an end-to-end test with Housecarl.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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abrown38andClaude Opus 5.5 committed 2026-10-22 16:29:37 +01:00
commit d06bf8d531
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testdata/presets/bind-xfr.txt
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203.0.113.9 client @0x7f3a1c0e4168 203.0.113.9#41234 (example.com): view external: zone transfer 'example.com/AXFR/IN' denied
2001:db8::9 client @0x7f3a1c0e4168 2001:db8::9#41234 (example.com): zone transfer 'example.com/AXFR/IN' denied
- client @0x7f3a1c0e4168 203.0.113.9#41234 (example.com): view external: query (cache) 'example.com/ANY/IN' denied
- client @0x7f3a1c0e4168 10.0.10.2#41234 (example.com): transfer of 'example.com/IN': AXFR started