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shankar0123
4dc8d3fa5b
Closes the RFC 8555 + RFC 9773 surface beyond the issuance happy-path:
- POST /acme/profile/<id>/key-change (RFC 8555 §7.3.5)
- POST /acme/profile/<id>/revoke-cert (RFC 8555 §7.6)
- GET /acme/profile/<id>/renewal-info/<cert-id> (RFC 9773 ARI)
After this commit, ACME clients can rotate account keys, revoke certs
through the ACME surface (rather than only via the certctl GUI/API),
and fetch ARI for proactive renewal scheduling.
Architecture:
- Key rollover: outer JWS verified against the registered account key
(existing kid path); the inner JWS — embedded as the outer's payload
— verified against the embedded NEW jwk in a new dedicated routine
(ParseAndVerifyKeyChangeInner) that enforces RFC 8555 §7.3.5
inner-only invariants: MUST use jwk + MUST NOT use kid, payload
.account == outer.kid, payload.oldKey thumbprint-equals registered.
A single WithinTx swaps the stored thumbprint+pem and writes the
audit row. Concurrent-rollover safety via SELECT…FOR UPDATE on the
conflicting account row in UpdateAccountJWKWithTx; the loser
observes the winner's new thumbprint and is told to retry (409).
- Revocation: two auth paths. kid → AccountOwnsCertificate single-
indexed COUNT lookup over acme_orders. jwk → constant-time RFC 7638
thumbprint compare against the cert's pubkey. Both paths route
through service.RevocationSvc.RevokeCertificateWithActor so the
existing CRL/OCSP refresh + audit + metrics pipeline applies. RFC
5280 §5.3.1 numeric reason codes clamp to certctl's
domain.ValidRevocationReasons; codes 8 (removeFromCRL) + 10
(aACompromise) clamp to 'unspecified' since they aren't in the set.
- ARI is GET-only and unauth per RFC 9773 §4. Cert-id wire shape is
base64url(AKI).base64url(serial); ParseARICertID strict-decodes,
SerialHex emits the canonical certctl-shape lowercase-no-leading-
zeros hex used in certificate_versions.serial_number.
ComputeRenewalWindow has 3 branches: bound RenewalPolicy →
[notAfter - days, notAfter - days/2]; no policy → last 33% of
validity; past expiry → [now, now + 1d] (renew immediately).
Retry-After honors CERTCTL_ACME_SERVER_ARI_POLL_INTERVAL.
What ships:
- internal/api/acme/{keychange,ari}.go (+ phase4_test.go: 15 tests).
- internal/api/acme/order.go: RevokeCertRequest wire shape.
- internal/api/handler/acme.go: KeyChange, RevokeCert, RenewalInfo
+ 11 new writeServiceError mappings.
- internal/repository/postgres/acme.go: UpdateAccountJWKWithTx (FOR
UPDATE + expectedOldThumbprint precondition; ErrACMEAccountKey-
ConcurrentUpdate sentinel) + AccountOwnsCertificate.
- internal/service/acme.go: RotateAccountKey + RevokeCert +
RenewalInfo; CertificateRevoker + RenewalPolicyLookup interfaces;
SetRevocationDelegate + SetRenewalPolicyLookup wiring; 11 new
sentinels; 6 new metrics.
- internal/service/acme_phase4_test.go: service-layer tests for
RotateAccountKey (happy + duplicate-key) + RevokeCert (kid mismatch
+ jwk mismatch + jwk happy + already-revoked + reason-clamping) +
RenewalInfo (disabled + bad cert-id).
- internal/api/router/router.go: 6 new register calls (3 per-profile
+ 3 shorthand). Router parity exceptions extended in lockstep
(in-tree SpecParityExceptions + CI-only openapi-handler-exceptions
.yaml).
- cmd/server/main.go: SetRevocationDelegate(revocationSvc) +
SetRenewalPolicyLookup(renewalPolicyRepo) at startup.
- internal/config/config.go: CERTCTL_ACME_SERVER_ARI_ENABLED (default
true) + CERTCTL_ACME_SERVER_ARI_POLL_INTERVAL (default 6h);
BuildDirectory's ariEnabled flag now flips on under
cfg.ARIEnabled.
- docs/acme-server.md: phase status flipped to Phase 4; endpoints
table grows 6 rows (3 per-profile + 3 shorthand); FAQ section
appended explaining how to rotate keys, revoke certs, and consume
ARI.
Tests:
- 'go vet ./...' clean across the repo.
- 'go test -short -count=1 ./...' green across every package.
- phase4_test.go covers: keychange happy-path + 5 negatives +
MapKeyChangeErrorToProblem coverage; ARI cert-id round-trip + 6
malformed cases + BuildARICertID from a generated cert; window-
math 3 branches.
- service-layer tests confirm: RotateAccountKey atomically swaps the
thumbprint (verifies persisted state) and rejects duplicate keys;
RevokeCert routes through the stub RevocationSvc with the right
actor string + reason on the jwk path, rejects mismatched keys,
rejects already-revoked certs, clamps reason codes correctly;
RenewalInfo respects ARIEnabled + cert-id format.
Engineering history: cowork/WORKSPACE-CHANGELOG.md 'ACME-Server-4'.