user fa3621806d feat: add per-listener SOCKS5 server authentication (RFC 1929) ...

Per-listener username/password auth via `auth:` config key. When set,
clients must negotiate method 0x02 and pass RFC 1929 subnegotiation;
no-auth (0x00) is rejected to prevent downgrade. Listeners without
`auth` keep current no-auth behavior.

Includes auth_failures metric, API integration (/status auth flag,
/config auth_users count without exposing passwords), config parsing
with YAML int coercion, integration tests (success, failure, method
rejection, no-auth unchanged), and documentation updates.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-21 17:03:03 +01:00

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