Closes#503.
Debian's fail2ban package ships defaults-debian.conf with
`[DEFAULT] backend = systemd`. Without an explicit override, our
familienarchiv-auth jail inherits the systemd backend at runtime,
reads from journald, and never inspects /var/log/caddy/access.log.
A live login brute-force would not be banned.
Add `backend = polling` to the jail and a CI step that links the jail
into /etc/fail2ban/ and asserts `fail2ban-client -d` resolves it to
the polling backend, not the inherited systemd backend.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The filter only watched /api/auth/login 401 — leaving the forgot-password
endpoint open to:
- email enumeration (slow brute-force probing which addresses exist)
- password-reset brute-force against accounts whose addresses leak
Widens the failregex to /api/auth/(login|forgot-password) and adds 429 to
the status alternation so a future in-app rate-limiter response is also
caught by the jail (defense in depth).
CI assertions extended to cover both new dimensions plus a negative case
on an unrelated 401 endpoint (/api/documents) — pins that the widening
did not over-match.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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>
