Adds two files mirroring the on-host install layout:
infra/fail2ban/filter.d/familienarchiv-auth.conf
infra/fail2ban/jail.d/familienarchiv.conf
Filter parses the JSON access log emitted by Caddy (previous commit) and
matches 401 responses on /api/auth/login. Jail bans the offending IP for
30 min after 10 attempts in a 10-minute window.
Verified the failregex against four sample log lines via fail2ban-regex
in an alpine container:
- 2 brute-force 401 attempts → matched (ban)
- 1 successful login (POST /api/auth/login 200) → not matched
- 1 unrelated GET /login 200 → not matched
Date template "ts":{EPOCH} parses Caddy's Unix-epoch ts field.
The previous review iteration described this jail in DEPLOYMENT.md prose
only; committing it makes the security posture reproducible from a
fresh server build.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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