Phase 2 of the CRL/OCSP responder bundle. Stops signing OCSP responses
with the CA private key directly; the local issuer now bootstraps a
dedicated responder cert + key per issuer, persists them, and rotates
within a grace window before expiry.
Why this matters:
- Every relying-party OCSP poll today triggers a CA-key signing op.
With this change those polls hit a cheap responder key; the CA key
only signs at responder bootstrap / rotation (rare).
- When the CA key lives on an HSM (PKCS#11 driver, V3-Pro item 3),
the dedicated responder removes the per-poll-HSM-op pressure.
- Carries id-pkix-ocsp-nocheck (RFC 6960 §4.2.2.2.1) so OCSP clients
do NOT recursively check the responder cert's revocation status.
What landed:
* migration 000020_ocsp_responder.up.sql (+down) — ocsp_responders table
keyed by issuer_id; rotated_from records the prior cert serial for
audit; not_after index drives the rotation scheduler query
* internal/domain/ocsp_responder.go — OCSPResponder type + NeedsRotation
helper (configurable grace window; default 7 days before expiry)
* internal/repository/postgres/ocsp_responder.go — Postgres impl with
upsert-on-Put + ListExpiring for the future rotation scheduler
* internal/repository/interfaces.go — OCSPResponderRepository interface
* internal/connector/issuer/local/ocsp_responder.go — bootstrap +
rotation logic; under c.mu so concurrent first-call OCSP requests
don't double-bootstrap; recovers gracefully from corrupt key ref
or corrupt cert PEM rather than failing the OCSP request
* internal/connector/issuer/local/local.go:
- Connector struct gains optional dependencies (ocspResponderRepo,
signerDriver, issuerID, rotation grace, validity, key dir)
- Set*() helpers for each dep matching the existing SCEPService
pattern (SetProfileRepo / SetProfileID)
- SignOCSPResponse refactored: ensureOCSPResponder dispatches on
whether deps are wired; fallback path (deps unset) preserves
pre-Phase-2 behavior of signing with CA key directly
* internal/connector/issuer/local/ocsp_responder_test.go — bootstrap
happy path; reuse-across-calls; fallback (no deps wired); rotation
on grace window; corrupt-key-ref recovery; corrupt-cert-PEM recovery;
SetOCSPResponderKeyDir setter
Coverage: local issuer 86.3% (above CI floor of 86; was 86.5% before
Phase 2 added ~140 LoC of new code). The recovered-from-drop tests are
real behavior tests of the new error paths I introduced, not
coverage-game artifacts.
Backward compat: unchanged for any caller that doesn't wire the
responder deps. The factory at internal/connector/issuerfactory/factory.go
still calls local.New(&cfg, logger) with no responder wiring; OCSP
responses continue to be signed by the CA key directly until the
operator wires the deps. cmd/server/main.go wiring lands in Phase 3
alongside the CRL cache service.
shankar0123