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shankar0123
1d6c7a0552
Closes Audit-2026-04-25 H-008 (High), M-017 (Medium), M-022 (Medium).
Hardens audit-trail tamper-resistance + minimizes PII leakage in one
cohesive change, with both controls applying automatically and no
operator action required at install time.
What changed
- internal/service/audit_redact.go (NEW) — RedactDetailsForAudit:
* credentialKeys deny-list (api_key, password, *_pem, eab_secret, ...)
* piiKeys deny-list (email, phone, ssn, name, address, ip_address, ...)
* case-insensitive key match; recurses into nested maps + arrays
* mutation-free; surfaces redacted_keys array for operator visibility
* nil/empty input → nil out (preserves pre-Bundle-6 behaviour)
- internal/service/audit.go — RecordEvent now routes details through
RedactDetailsForAudit BEFORE marshaling. No call-site changes required.
- internal/service/audit_redact_test.go (NEW) — full coverage:
* credential keys (~30 entries)
* PII keys (~20 entries)
* nested maps + arrays
* case-insensitivity
* mutation-free invariant
* JSON round-trip (catches type-assertion regressions)
* scalar pass-through (no panic on int/bool/nil)
- migrations/000018_audit_events_worm.up.sql (NEW) — DB-level WORM:
* BEFORE UPDATE OR DELETE trigger raises check_violation with
diagnostic citing the rationale + compliance-superuser hint
* REVOKE UPDATE,DELETE ON audit_events FROM certctl (defence-in-depth)
* REVOKE wrapped in pg_roles existence check so test fixtures
without the certctl role stay idempotent
- migrations/000018_audit_events_worm.down.sql (NEW) — clean teardown
for dev resets; not for production use.
- internal/repository/postgres/audit_worm_test.go (NEW, testcontainers,
-short gated) — INSERT succeeds; UPDATE + DELETE fail with
check_violation; second INSERT after blocked modification still
succeeds (no trigger-state corruption).
- docs/compliance.md — new section "Audit-Trail Integrity & Privacy
(Bundle 6)" with verification psql snippet, compliance-superuser
pattern (NOT auto-created), redactor before/after example, and a
maintenance note for adding new credential keys.
Compliance mapping
- H-008 (CWE-532 Insertion of Sensitive Information into Log File)
- M-017 (HIPAA Technical Safeguards §164.312(b) — audit controls)
- M-022 (GDPR Art. 32 — data minimization)
Threat model: TB-3 (audit log tampering), TB-1 (operator/orchestrator).
Verification
- go vet ./... → clean
- go build ./... → clean
- go test -short -count=1 ./... → all packages pass
- go test -count=1 -run TestRedactDetailsForAudit ./internal/service/...
→ all pass
- (testcontainers, gated by -short) audit_worm_test.go pins WORM contract
- npx tsc --noEmit (web) → clean (no frontend changes)
- python3 yaml.safe_load(api/openapi.yaml) → 89 paths
Backward compatibility
- Trigger applies forward only — existing rows unchanged.
- nil/empty details from RecordEvent callers → nil out (preserves prior
behaviour for the many existing call sites that pass nil).
- Compliance superusers (provisioned out-of-band) bypass the trigger.
Bundle 6 of the 2026-04-25 comprehensive audit.