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shankar0123
ca1e135aa3
Closes CRIT-2 of the 2026-05-10 audit. The BCL handler previously called
sessionSvc.RevokeAllForActor(sub, "User") but session rows are keyed by
user.ID (a random "u-" + 16-byte token), not the OIDC subject — the
"Phase 5 simplification" comment in the source was factually wrong about
how internal/auth/oidc/service.go::upsertUser seeds user.ID. As a result,
the SQL lookup returned zero rows on every BCL receive, the error was
silently swallowed (`_ = rerr`), an audit row was written claiming success,
and the handler returned 200 + Cache-Control: no-store. OIDC BCL 1.0 §2.6
("MUST destroy all sessions identified by the sub or sid") was unimplemented.
CWE-613.
This commit:
- Adds userRepo (repository.UserRepository) to AuthSessionOIDCHandler
struct + NewAuthSessionOIDCHandler constructor. cmd/server/main.go
injects the existing oidcUserRepo (no new repository instance).
- Replaces the broken sub-as-actor-id path with:
1. providerRepo.List(ctx, tenantID) + IssuerURL filter to map
claims.iss → provider row (N is small; typically 1-5).
2. userRepo.GetByOIDCSubject(ctx, provider.ID, sub) to resolve the
OIDC subject → user.ID.
3. sessionSvc.RevokeAllForActor(user.ID, "User") with the RESOLVED
actor_id (not the OIDC subject).
- Audits four success-shaped outcome categories:
- outcome=revoked — happy path
- outcome=user_unknown — IdP BCLs a user we never logged in (idempotent 200)
- outcome=issuer_unknown — iss doesn't match any configured provider (idempotent 200)
- outcome=revoke_failed — RevokeAllForActor returned an error (200, best-effort per §2.8)
And two transient outcomes that return 503 (IdP retries per §2.8):
- outcome=provider_lookup_failed — providerRepo.List error
- outcome=user_lookup_failed — non-NotFound userRepo error
- Removes the misleading "Phase 5 simplification" comment block; replaces
with a doc explaining the resolution path + outcome taxonomy + spec refs.
- Adds 5 regression tests in internal/api/handler/auth_session_oidc_test.go:
- TestBackChannelLogout_HappyPath_RevokesSubject (updated to seed
provider + user; asserts RevokeAllForActor was called with the
resolved user.ID, not the raw OIDC subject — the test that would
have caught CRIT-2 had it existed)
- TestBackChannelLogout_UnknownUserReturns200WithAudit
- TestBackChannelLogout_IssuerUnknownReturns200WithAudit
- TestBackChannelLogout_TransientUserRepoErrorReturns503
- TestBackChannelLogout_RevokeFailureReturns200WithAuditFailureOutcome
- Introduces stubUserRepo in the handler test file (matching the four
repository.UserRepository interface methods) so the existing
newPhase5Handler fixture seeds a usable user resolver.
Verification gate green:
- gofmt -l . clean
- go vet ./... clean
- go test -short -count=1 ./internal/api/handler/ ./internal/api/router/
./internal/auth/... ./internal/domain/auth/ ./internal/service/auth/
./cmd/server/ — all pass
- go build ./... clean
CRIT-1 from the same audit is already closed on this branch (commit
68ca42f); CRIT-3 / CRIT-4 / CRIT-5 remain open and continue to block
the v2.1.0 tag. Spec: cowork/auth-bundles-fixes-2026-05-10/02-crit-2-bcl-sub-lookup.md.
Refs: cowork/auth-bundles-audit-2026-05-10.md CRIT-2