* security(auth): per-IP rate limit on auth endpoints + generalize last-admin guard
Closes#45 and #151.
#45 — every auth endpoint was unthrottled (login, magic-link, token,
bootstrap), leaving us open to password brute-force and SMTP
email-bombing. Wires slowapi (new dep) into the middleware chain with
per-route limits: 10/min on login + token, 5/min on send-link, 3/min on
bootstrap. Returns 429 with Retry-After: 60 once exceeded. Per-IP key
respects the leftmost X-Forwarded-For hop (Caddy in front of the app
strips client-supplied XFF). Operator escape hatch:
AGNES_AUTH_RATELIMIT_ENABLED=0. Test suite disables the limiter via
autouse conftest fixture so existing auth tests that hammer endpoints
in tight loops are unaffected.
#151 — DELETE /api/admin/users/{id}/memberships/{group_id} and the
mirror DELETE /api/admin/groups/{group_id}/members/{user_id} only
guarded against self-removal as last admin. Generalizes to refuse
removing anyone from the seeded Admin group when they are the only
remaining active admin (mirrors the existing
count_admins(active_only=True) <= 1 check on delete_user / update_user).
Recovery from zero admins requires direct DB access, so this closes
a path where a scheduler/bootstrap actor that bypasses normal admin
checks could otherwise empty the group.
* security(auth): throttle remaining email-bombing + token-confirm endpoints
Address code-review gap on PR #165 — the first commit covered /send-link
but missed two endpoints with the IDENTICAL email-bombing surface:
- POST /auth/password/reset — sends reset mail, anti-enum response
- POST /auth/password/setup/request — sends setup mail, anti-enum response
Both now share the 5/min limit with /send-link.
Also add 10/min to the token-confirm surfaces — high-entropy tokens but
partial leaks via logs / referer have surfaced before, and unbounded
guess rate would let an attacker exhaust the keyspace adjacent to a
leaked prefix:
- POST /auth/email/verify
- GET /auth/email/verify — closes the click-through bypass
- POST /auth/password/reset/confirm
- POST /auth/password/setup/confirm
Doc fix: rate_limit.py module docstring + CHANGELOG entry no longer
claim "disable without a redeploy" (misleading). The Limiter constructor
freezes `enabled` from env at import time, matching every other Agnes
env knob — operators set the flag and bounce the container.
Tests: 4 new cases in test_auth_rate_limit.py covering
/reset, /setup/request, /reset/confirm, GET /verify. Full suite:
2583 passed, 32 skipped, 0 failed.
* security(auth): throttle JSON /auth/password/setup — closes form-throttle bypass
Second code-review pass on PR #165 caught a fifth gap: POST /auth/password/setup
(JSON variant, kept for backward compat) consumes the same setup_token as
the web form /setup/confirm but was unthrottled — an attacker brute-forcing
the token just switches from the form path to the JSON path and resumes
at unbounded RPS. Apply the same 10/min limit and signature shape used
on /setup/confirm.
Also extend CHANGELOG note about the JSON-variant bypass for future
operators reading the security entry.
Test: 1 new case (test_password_setup_json_rate_limited_after_10_requests),
9 rate-limit tests + 28 password-flow tests + 41 auth-provider tests pass,
no regressions.
* chore(release): cut 0.30.1 — auth security hardening (rate limit + last-admin guard)
91caefaca9