- oauth_login_callback's integrated-mode token-exchange branch now reuses
the shared discovery cache via get_oidc_discovery (round-2 finding 1).
- AS proxy flow now generates an OIDC nonce in oauth_authorize, stores it
on ASProxySession, forwards it to the IdP, and passes it as
expected_nonce to verify_id_token in _oauth_callback_as_proxy
(round-2 finding 2).
- Consolidate the two parallel discovery caches: oauth_routes' local
_discovery_cache and _get_cached_discovery are removed; all callers
now go through token_utils.get_oidc_discovery, which acquires the
follow_redirects=True knob it needs for Nextcloud installs without
pretty URLs (round-2 finding 3).
- Demote per-user INFO logs in oauth_tools.py (check_logged_in,
get_provisioning_status) to DEBUG; the elicitation auth URL is no
longer logged because it contains a sensitive state token
(round-2 finding 4).
Also pin nonce binding behaviour with a new unit test that asserts
_oauth_callback_as_proxy forwards session.nonce to verify_id_token, and
update test mocks to track the cache consolidation.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Blocking:
- AS proxy callback now calls verify_id_token before caching the proxy
code so a tampered IdP response can't smuggle identity claims.
Important:
- Browser OAuth flow generates and verifies an OIDC nonce; new alembic
migration 006 adds the nonce column to oauth_sessions.
- _origin_matches_self logs a warning when CSRF check is bypassed.
- oauth_tools.py uses get_shared_storage instead of fresh handles.
Nits:
- New token_utils.get_oidc_discovery shares the 5-minute cache with
verify_id_token; oauth_login (integrated) and _revoke_refresh_token_at_idp
now use it instead of issuing fresh discovery fetches.
- Drop typing.Optional from oauth_tools.py in favour of X | None.
CI:
- test.yml generates an ephemeral Fernet TOKEN_ENCRYPTION_KEY per run
with openssl, removing the dependency on a missing repo secret.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Addresses the two remaining 🟡 findings from the PR #758 follow-up review:
1. extract_user_id_from_token previously fell back to "default_user" when
the verified access token had no sub claim. In a multi-tenant deployment
a malformed IdP token could have bucketed every request under a single
sentinel user, risking cross-tenant data exposure. The function now
raises McpError on that branch; the BasicAuth no-token sentinel path is
preserved.
2. oauth_callback_nextcloud (Flow 2) read the PKCE code_verifier from
oauth_sessions but never deleted the row, leaving the verifier valid for
the full 10-minute TTL. The row is now deleted eagerly inside the same
branch, mirroring oauth_login_callback in browser_oauth_routes.
Also wires TOKEN_ENCRYPTION_KEY through the docker-compose step in the CI
test workflow so the integration matrix can boot — every job had been
failing fast on the ${TOKEN_ENCRYPTION_KEY:?...} interpolation guard added
in PR #758 finding 5.
Tests pin both fixes (test_token_utils_user_id.py,
test_oauth_callback_session_cleanup.py).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
