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shankar0123
81f6321326
Closes Top-10 fix #1 of the 2026-05-03 issuer-coverage audit (see cowork/issuer-coverage-audit-2026-05-03/RESULTS.md). Pre-fix, ejbca.go::New called tls.LoadX509KeyPair once at construction and configured the keypair into *http.Transport.TLSClientConfig with no mtime watch. mTLS rotation required a server restart — quarterly rotation per any reasonable security policy = quarterly deploy outage. Bundle M from the prior 2026-05-01 audit shipped the mtlscache helper at internal/connector/issuer/mtlscache/cache.go and wired it into Entrust + GlobalSign. EJBCA was missed in Bundle M's scope. This commit ports the same helper onto EJBCA's auth_mode=mtls path. The OAuth2 path is unchanged. Implementation: - New imports internal/connector/issuer/mtlscache. - Connector struct gains an mtls *mtlscache.Cache field (mirroring Entrust + GlobalSign). - New()'s case 'mtls': replaces tls.LoadX509KeyPair + manual *http.Transport with mtlscache.New(certPath, keyPath, Options{HTTPTimeout: 30s}). Cache build happens at construction so misconfigured operators fail fast (matches pre-fix behaviour). - New helper getHTTPClient() returns the cached client; on the mTLS path it calls RefreshIfStale before returning so the next request uses the new keypair if disk has rotated. On OAuth2 / test paths (c.mtls == nil), returns c.httpClient as-is. - All 3 c.httpClient.Do call sites (IssueCertificate enroll, RevokeCertificate revoke, GetOrderStatus cert lookup) replaced with c.getHTTPClient() + client.Do. - crypto/tls import removed (no longer used at this layer). Tests: - TestEJBCA_MTLSKeypairRotation_PicksUpNewCertWithoutRestart (new, ejbca_mtls_rotation_test.go): generates two CAs (caA, caB), signs leafA + leafB, spins up an httptest TLS server that trusts both CAs and records the issuer DN of every presented client cert, writes leafA, makes request 1, writes leafB + advances mtime by 2s, makes request 2. Asserts the server saw caA's DN on req 1 and caB's DN on req 2 — the cache picked up the rotation without ejbca.New re-running. - export_test.go: GetHTTPClientForTest helper exposes the private getHTTPClient so the rotation test drives the production code path. - All existing EJBCA tests still pass (TestNew_MTLSWiresClientCert, TestNew_MTLSCertLoadFailure, TestNew_OAuth2NoTransportTuning, TestNew_InvalidAuthMode). Verified locally: - gofmt clean across the repo. - go vet ./... clean across the repo. - go test -race -count=1 -short ./internal/connector/issuer/ejbca/... ./internal/connector/issuer/mtlscache/... green. Audit reference: cowork/issuer-coverage-audit-2026-05-03/ RESULTS.md Top-10 fix #1.