PR C of SECURITY_PLAN.md: after 5 failed /login attempts an IP is refused
for 30 s, and each failure after that refuses it for twice as long, up
to 15 min. A success resets it, as does an hour without a failure.
- LoginThrottle.h holds the schedule and 8 IPs, with the time passed in
so native tests cover it. While all 8 hold recent failures, every
other IP shares one more slot, so many addresses don't each get five
free tries.
- A refused IP gets 429 with Retry-After before its credentials are
checked, so a right guess during a lockout reveals nothing. Home
Assistant retries a 429 instead of asking for new credentials.
- The web UI's login panel shows a 401's or 429's message, where it
popped a service error.
- test/e2e --lockout checks it on a Secured device and waits it out.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
