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shankar0123
15435ca02b
Closes HIGH-3 of the 2026-05-10 audit. Pre-fix the BCL handler
accepted any logout_token whose iat + jti were syntactically present
but never checked (a) that iat fell within a skew window or (b) that
jti hadn't been seen before. A captured logout_token was replayable
indefinitely; once CRIT-2 was fixed, every replay would revoke the
user's current sessions — persistent DoS. RFC 9700 §2.7 + OIDC BCL
1.0 §2.5 require jti replay defense.
- Migration 000040_bcl_replay_cache: oidc_bcl_consumed_jtis table with
composite PK on (jti, issuer_url) — RFC 7519 §4.1.7 per-issuer
uniqueness — and an expires_at index for the GC sweep.
- repository.BCLReplayRepository interface + ErrBCLJTIAlreadyConsumed
sentinel. Postgres impl uses INSERT...ON CONFLICT DO NOTHING
RETURNING true for atomic single-use semantics in one round-trip.
- handler.DefaultBCLVerifier gains WithMaxAge + nowFn clock seam. iat
freshness check rejects tokens whose iat is in the future beyond
max-age OR stale beyond it. Verifier signature extended:
Verify(ctx, jwt) (iss, sub, sid, jti string, iat int64, err error).
- handler.AuthSessionOIDCHandler gains BCLReplayConsumer (interface)
+ WithBCLReplayConsumer(consumer, maxAge) setter. BackChannelLogout
consumes the jti post-verify with TTL = max(24h, 2*maxAge):
- first-receive → 200, sessions revoked, audit outcome=revoked
- replay (ErrBCLJTIAlreadyConsumed) → 200 + Cache-Control: no-store,
audit outcome=jti_replayed, sessions NOT re-revoked
- transient (non-AlreadyConsumed error) → 503 so the IdP retries
- internal/scheduler/scheduler.go: SetBCLReplayGarbageCollector wires
SweepExpired into the existing session-GC tick (no separate ticker
for short-lived replay rows).
- cmd/server/main.go: bclMaxAge from cfg.Auth.OIDCBCLMaxAgeSeconds
(default 60s, env CERTCTL_OIDC_BCL_MAX_AGE_SECONDS); bclReplayRepo
wired into the verifier + handler + scheduler.
- Three regression tests in internal/api/handler/bcl_replay_test.go:
TestBackChannelLogout_FirstReceiveConsumesJTI,
TestBackChannelLogout_ReplayedJTIReturns200WithAudit,
TestBackChannelLogout_TransientConsumeFailureReturns503.
- internal/api/handler/auth_session_oidc_test.go: stubBCLVerifier
gains jti + iat fields; existing TestBackChannelLogout_* tests
rewritten for the new Verify return.
Verification gate green: gofmt clean, go vet clean, go test -short
-count=1 on internal/api/handler / internal/api/router /
internal/scheduler / cmd/server / internal/auth/oidc /
internal/auth/breakglass — all pass.
CRIT-1..CRIT-5 + HIGH-1 + HIGH-2 + HIGH-3 of the 2026-05-10 audit
now closed on this branch. Spec at
cowork/auth-bundles-fixes-2026-05-10/07-high-3-bcl-replay-defense.md.
Refs: cowork/auth-bundles-audit-2026-05-10.md HIGH-3
8 lines
200 B
PL/PgSQL
8 lines
200 B
PL/PgSQL
-- 000040_bcl_replay_cache.down.sql
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-- Reverse of 000040_bcl_replay_cache.up.sql.
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BEGIN;
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DROP INDEX IF EXISTS idx_oidc_bcl_consumed_jtis_expires;
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DROP TABLE IF EXISTS oidc_bcl_consumed_jtis;
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COMMIT;
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