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shankar0123
b0c4ed1ae2
Closes Top-10 fix #3 of the 2026-05-03 issuer-coverage audit (see cowork/issuer-coverage-audit-2026-05-03/RESULTS.md). Pre-fix, the OpenSSL adapter (497 LOC, certctl's highest-risk issuer surface) had openssl_test.go (8 happy-path funcs + 20 subtests) but no dedicated _failure_test.go. Compare to ACME, Vault, DigiCert, Sectigo, Entrust, GlobalSign, EJBCA — all peers have one. An acquirer's diligence team flags this as an immediate blocker on the highest-risk issuer surface. This commit adds 6 failure-mode tests: 1. TestOpenSSL_Issue_ScriptNotFound_OperatorActionableError — SignScript path doesn't exist; error wraps os.ErrNotExist (errors.Is); message contains 'no such file' / 'not found' so the operator's grep finds it in journalctl. 2. TestOpenSSL_Issue_PermissionDenied_OperatorActionableError — SignScript exists with mode 0o600 (non-executable); error wraps os.ErrPermission; message contains 'permission'. Skipped under root (uid 0 bypasses chmod gating). 3. TestOpenSSL_Issue_MalformedStdout_DistinguishedFromCSRReject — script exits 0 + writes garbage (no PEM markers) to the cert output file; error mentions PEM/certificate/parse so operators distinguish output-parsing failure from a script- side fault. 4. TestOpenSSL_Issue_NonZeroExit_DistinguishesCAReject_From_ ScriptError — script writes 'policy violation: …' to stderr and exits 2 (CA-side rejection convention); the script's stderr surfaces in the error message; errors.Unwrap returns non-nil (proving the underlying *exec.ExitError chain survives). 5. TestOpenSSL_Issue_TimeoutEnforced_ContextCancellationPropagates — script does 'exec sleep 30' (not 'sleep 30 ' as a child; exec replaces bash so SIGKILL goes directly to the sleeper, avoiding the orphan-pipes corner case where a killed bash leaves sleep holding stdout/stderr open and CombinedOutput blocks); ctx with 100ms deadline; call returns within ~5s wall-clock; either errors.Is(err, context.DeadlineExceeded) or the error message names 'killed' / 'signal'. 6. TestOpenSSL_Issue_SignalKilled_PartialOutputDiscarded — script writes a half-PEM ('-----BEGIN CERTIFICATE-----\nMII…') then 'kill -KILL $$'; assertion: result is nil OR CertPEM is empty (no half-cert leaks to caller); error names 'signal' / 'killed' OR 'PEM' / 'parse' (both are operator-actionable). Each test pins the operator-actionable error message contract: the message names the failure mode (so journalctl + grep find it) and proves no half-state was created (no partial cert returned). errors.Is / errors.Unwrap checks confirm the wrapping chain survives. The OpenSSL adapter has no commandRunner abstraction (production code uses exec.CommandContext directly); these tests use real operator-supplied scripts written to t.TempDir (matches the adapter's actual production code path; no os/exec mocking). The 'exec sleep 30' technique in Test 5 is the load-bearing fix for the bash-orphans-sleep-and-pipes-stay-open corner case that otherwise makes the test take 30s instead of 100ms. Coverage delta: - Before this commit: openssl_test.go + openssl_stubs_test.go covered 8 happy-path funcs. - After: 79.8% statement coverage of openssl.go (up from operator-pre-existing baseline; the 6 new tests exercise every error path through callSignScript + parseCertificate). Tests pass clean under '-race -count=10' (Test 5's deadline tolerance is the only timing-sensitive case; the 5s wall-clock budget vs the 100ms ctx deadline gives ample slack on slow CI without masking deadline-not-enforced bugs). Test-only commit; no production code changes. Hardening fixes (per-call concurrency semaphore, threat-model docs) are separate Top-10 entries. Verified locally: - gofmt clean across the repo. - go vet ./... clean across the repo. - go test -race -count=10 -short ./internal/connector/issuer/openssl/... green. Audit reference: cowork/issuer-coverage-audit-2026-05-03/ RESULTS.md Top-10 fix #3.