Introduce a thread-safe RateLimiter that tracks attempts per key
(IP address) within a sliding time window, and wire it into the
authentication endpoints:
- Login: failed login attempts from an address are counted; once the
configured maximum is exceeded within the window, further logins
from that address are rejected with RespTooManyRequests. A
successful login clears the failed attempts for that address.
- Registration: implement the previously stubbed
tooManyRegistrationAttempts, limiting how many accounts can be
created per address per window.
- Forgot-password: throttle both the email-request and the
email-challenge paths per address.
New [security] settings with defaults:
max_login_attempts_per_ip=5 / login_attempt_window_seconds=900
max_registrations_per_ip=2 / registration_window_seconds=3600
max_forgot_password_requests_per_ip=3 / forgot_password_window_seconds=3600
Adds unit tests for the RateLimiter (window limit, over-limit
blocking, clearing, per-key independence).
Took 3 minutes
