xarmian
3f69b76b06
feat(security): enforce session UA binding under strict mode (TASK-2056) ( #912 )
...
Session IP/User-Agent binding was log-only by default, so a stolen
session token granted durable any-origin access. IP-change enforcement
already existed behind PAD_IP_CHANGE_ENFORCE=strict; this extends the
same single toggle to also enforce the User-Agent-hash binding.
When strict enforce is ON, a request whose client IP OR User-Agent hash
no longer matches the session's stored binding now revokes the session
(DeleteSessionIfExists) and rejects the request (401 for API,
revoked-passthrough for public/browser paths), killing the stolen token.
When enforce is OFF (default), behavior is unchanged: UA mismatch is
logged (slog only, no new audit row) and the request proceeds, so
existing self-host users see no behavior change and routine client churn
(browser/WebView updates, DevTools emulation, mobile-app rebuilds) is
tolerated.
The UA hash is stable within a real session, so UA-mismatch enforce
carries fewer false positives than IP enforce (mobile roaming, VPN
toggles, carrier NAT) — documented in the handler comment. Adds the
ActionSessionUAChanged audit action, emitted only in strict mode.
No DB migration: reuses the existing IPChangeEnforce config flag and the
existing session store primitives.
Claude-Session: https://claude.ai/code/session_015yuBJQYfDj95cgX3DaD8SF
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