9435baa09dab228e5565bdde1c4dfb270b468956
2 Commits
| Author | SHA1 | Message | Date | |
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 Ronni Baslund
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9435baa09d |
feat(audit): hash-chain tamper evidence + signed checkpoints (Phase 3)
The audit log now carries cryptographic chain-of-custody. Every chained
event references the previous event's sha256, and periodic checkpoints
sign the head with HMAC-SHA-256. An attacker who modifies a historical
row must also forge every checkpoint signature past it — which requires
the AUDIT_SIGNING_KEY, kept outside Mongo.
Schema (services/platform-api/src/schemas/):
- audit-event.schema.ts: new `seq` (monotonic) + `chained` (Phase-3-or-
later flag) + `prevHash` + `hash`. Compound unique index on seq with
partial filter so pre-Phase-3 rows don't collide on null.
- audit-counter.schema.ts: single doc `_id='audit_seq'`, incremented
atomically by findOneAndUpdate($inc).
- audit-checkpoint.schema.ts: { at, headSeq, headHash, signature,
sigAlg, reason }. Reason ∈ {startup, interval, threshold, manual}.
Audit module (services/platform-api/src/audit/):
- canonical.ts: stable JSON form + hashCanonical (sha256) +
checkpointSignature (HMAC-SHA-256) + verifyCheckpointSignature
(timingSafeEqual). Single source of truth for hash inputs — schema
additions land here at the same time as the field.
- audit.service.ts: record() now allocates seq → looks up lastHash() →
computes hash → inserts. Per-process write mutex serializes the
allocate+lookup so concurrent writers don't both chain off the same
predecessor. Documented multi-instance caveat (needs Mongo replica
set + transactions OR a distributed lock).
- checkpoint.service.ts: scheduler triggers on startup + every 5min
+ threshold of 100 events accumulated. Skips when no new chained
events since the last anchor.
- verifier.service.ts: walks chain in seq order, recomputes each
hash, validates checkpoint signatures. Returns a precise break:
'event-hash-mismatch' (in-place modification), 'event-prev-hash-
mismatch' (insertion/deletion), or 'checkpoint-signature-mismatch'.
- audit.controller.ts: GET /audit/verify, GET /audit/checkpoint/latest,
POST /audit/checkpoint (manual force).
Operator UI (apps/operator/):
- 3 new proxies under /api/audit/{verify, checkpoint/latest, checkpoint}.
- pages/audit.vue: new "Tamper evidence" card with "Force checkpoint"
+ "Verify chain" buttons. Header shows live head seq; result line
shows verified count or a precise break (kind + seq + expected vs
actual hash). Background tinted green/red on ok/broken.
Env (.env + docker-compose.yml):
- new AUDIT_SIGNING_KEY (32-byte hex HMAC secret). Prod swaps this for
ed25519 from an HSM/KMS; verifier code stays the same because sigAlg
is on the checkpoint doc.
Smoke-tested all three break paths against a clean chain of 5 events:
- normal verify: ok=true, 5/5 events verified, 1 checkpoint signed
- modified seq=3 in Mongo directly: verify returns ok=false with
break = { kind: 'event-hash-mismatch', seq: 3, expected, actual }
- restored, nuked checkpoint signature: break = { kind:
'checkpoint-signature-mismatch', headSeq: 5 }
- operator UI's verify panel reflects all three states correctly.
Legacy data: pre-Phase-3 events stay `chained: false` and are excluded
from the chain walk. Retroactive chaining of historical entries is a
one-off migration script we can run if we ever care to.
Out of scope (Phase 4 etc.):
- TTL + cold-storage archival to Hetzner Object Storage
- GDPR right-to-erasure tooling
- ed25519 / HSM signing (swap is well-defined; sigAlg field is ready)
- Multi-instance write coordination (Mongo transaction OR distributed
lock when we scale platform-api beyond 1 replica)
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Ronni Baslund
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02341d8ba5 |
feat(audit): platform-api audit log + operator UI wired to real events
Phase 1 of the audit work — capture everything we control today, ingest from
external systems (Authentik / OCIS / Stalwart) in a later phase. The mock
OP_AUDIT fixture is gone; both the /audit page and Overview's activity card
now show real events recorded by AuditService.record() in platform-api.
Schema (services/platform-api/src/schemas/audit-event.schema.ts):
AuditEvent { at, actorType, actorId, actorEmail, actorIp, action, outcome,
resourceType, resourceId, resourceName, tenantSlug, partnerSlug, source,
metadata, prevHash, hash }
Indexes: {at:-1}, {tenantSlug,at:-1}, {actorId,at:-1}, {action,at:-1}.
prevHash/hash are nullable now; hash-chain tamper evidence is a later phase.
AuditService:
- record() — best-effort write, swallows errors so the underlying mutation
that succeeded isn't failed by a downstream log issue. Surfaces failures
via Logger.
- list() — filters: since/until/before, action (exact OR prefix match
via leading-anchor regex), tenantSlug, partnerSlug, actorEmail, outcome,
free-text q across action/resourceName/actorEmail/tenantSlug, limit
(default 100, max 500). Cursor pagination via `before`.
- No UPDATE/DELETE surface — entries are append-only by construction.
AuditController: GET /audit, behind JwtAuthGuard + OperatorGuard. No mutations
exposed; entries written internally by other modules.
X-Forwarded-For threading:
- apps/operator/server/utils/platform-api.ts forwards the originating
client IP to platform-api so audit entries carry a real address.
- services/platform-api/src/auth/client-ip.ts extracts leftmost
X-Forwarded-For, falls back to socket.remoteAddress.
Instrumented mutations (every one threads actor + IP through):
Tenants: create, update, softDelete, setStatus(suspend/resume)
Partners: create, update, terminate
Flags: create, update (incl. flag.killed verb when state=off+note=kill-switch),
remove
Users: deactivate
Each controller resolves the User doc via ActorService, extracts IP via
clientIp(req), and passes { userId, email, ip } as AuditActor to the service.
FlagsService's local ActorRef collapses to AuditActor so flag history and the
audit log share one shape.
Operator UI:
- /api/audit proxy that forwards query params verbatim
- types/audit.ts
- pages/audit.vue: real list with quick-pick action chips (All/Tenants/
Partners/Flags/Users), outcome filter, free-text search, "Load older
events" cursor pagination
- pages/index.vue: Overview activity card swaps mock OP_AUDIT for the
same /api/audit endpoint, rows link into /audit
- data/fixtures.ts: OP_AUDIT / AuditEntry / AuditTone exports removed
Verified end-to-end: suspended + resumed acme, flipped oci_versioning through
rollout → kill → on, then /audit returned all 5 events with the right action
verbs (tenant.suspended, tenant.resumed, flag.updated, flag.killed,
flag.updated), actor admin@dezky.local, IP 192.168.65.1. Filters (action
prefix + free-text q) narrow correctly.
Out of scope for this commit (each gets its own conversation):
- Authentik / OCIS / Stalwart ingest adapters (Phase 2)
- Hash-chain tamper evidence (Phase 3)
- TTL + cold-storage archival to Hetzner Object Storage (Phase 4)
- GDPR right-to-erasure tooling
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