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Phase 10 of the SCEP RFC 8894 + Intune master bundle. Adds reproducible
testdata fixtures + a hermetic end-to-end test that exercises the full
handler → service → dispatcher → CertRep wire path.
Phase 10.1 — Golden-file tests (internal/scep/intune/):
* testdata/intune_trust_anchor.pem — deterministic ECDSA P-256 cert
seeded from a constant byte string (sha256-derived PRNG); regenerates
byte-identical PEM bytes across runs.
* testdata/intune_challenge_golden_success.txt — valid challenge,
iat/exp window covers goldenChallengeNow.
* testdata/intune_challenge_golden_expired.txt — same trust anchor +
payload shape but iat/exp shifted into the past.
* testdata/intune_challenge_golden_tampered_sig.txt — payload bytes
intact, last sig byte flipped.
challenge_golden_test.go reads each fixture and asserts:
- Success → ValidateChallenge returns a populated claim
(DeviceName / Subject / SANDNS pinned to the documented values).
- Expired → errors.Is(err, ErrChallengeExpired).
- Tampered → errors.Is(err, ErrChallengeSignature).
- Plus two defensive permutations: WrongAudienceReuse pins the
audience-check ordering after a successful sig verify;
RotatedTrustAnchorRejects pins the holder-rotation failure mode
using a freshly-generated unrelated trust cert.
golden_helper_test.go contains the deterministic-PRNG, ES256 signer,
fixture-load helpers, and the regeneration target. Operators flip
fixtures via:
go test -run='^TestRegenerateGoldenFixtures$' ./internal/scep/intune/... -args -update-golden
Why ECDSA + a deterministic seed: a hand-pasted base64 blob would
break on every Go stdlib bump (json.Marshal field ordering, ASN.1
encoding edge cases). Generating from a pinned seed gives
reproducible PEM bytes; only the ECDSA signature suffix varies
across regenerations (Go's stdlib doesn't expose RFC 6979
deterministic-k cleanly), and ValidateChallenge re-verifies the
signature on every read so it doesn't matter.
intune package coverage: 95.2% (was 94.8%).
Phase 10.2 — Hermetic end-to-end test (internal/api/handler/scep_intune_e2e_test.go):
Departs from the spec's deploy/test/ location because the handler
package already has the chromeOS-shape PKIMessage builders (buildTestCSR
/ buildEnvelopedDataForTest / buildSignedDataForTest / aesCBCEncrypt /
postPKIOperation). Putting the e2e test in the handler package lets it
reuse those helpers AND run in the default 'go test ./...' sweep —
every CI run exercises the full Intune dispatcher chain. The
deploy/test/ location is reserved for a future docker-compose-driven
variant that would mount a fixture trust anchor into the running
container; this hermetic version proves the wire works without that
dependency.
intuneE2EFixture stands up:
- A real Intune Connector signing keypair (ECDSA P-256) + cert
written to a temp PEM file the TrustAnchorHolder loads at startup.
- A real RA pair the SCEPHandler decrypts EnvelopedData with.
- A fixture issuer connector (intuneE2EIssuerConnector) that
records every IssueCertificate call + returns a deterministic
child cert chained to a fixture CA. Implements the full
IssuerConnector interface (IssueCertificate / RenewCertificate /
RevokeCertificate / GenerateCRL / SignOCSPResponse / GetRenewalInfo)
with the non-issuance methods stubbed.
- A capturing AuditRepository that records every Create call so
the test can assert action='scep_pkcsreq_intune' was emitted.
- A real SCEPService with SetIntuneIntegration wired to a real
ReplayCache + PerDeviceRateLimiter.
Three test scenarios:
1. TestSCEPIntuneEnrollment_E2E — the documented happy path. Forge
a valid Intune-shaped challenge (ES256 signed, length > 200, two
dots — satisfies looksIntuneShaped), build a CSR with CN matching
the claim's device_name, POST through HandleSCEP, decode the
CertRep, assert pkiStatus=SUCCESS + issuer.issued has one entry
+ audit log carries 'scep_pkcsreq_intune' + IntuneStats.counters[
'success']==1.
2. TestSCEPIntuneEnrollment_ClaimMismatchRejected_E2E — same setup
but CSR CN is 'attacker-host.example.com'. Dispatcher must
reject with CertRep FAILURE+BadRequest (mapIntuneErrorToFailInfo:
ErrClaimCNMismatch → BadRequest), no issuance, IntuneStats
counters['claim_mismatch']==1.
3. TestSCEPIntuneEnrollment_TamperedSignature_E2E — flip a byte in
the JWT signature segment of the Intune challenge before
wrapping it in the PKIMessage. Dispatcher rejects with
FAILURE+BadMessageCheck (signature errors → BadMessageCheck per
the same mapping table).
Important sanity learning during construction: the buildTestCSR
helper from scep_chromeos_test.go does NOT populate DNSNames on the
CSR. The success claim therefore omits san_dns to avoid tripping
ErrClaimSANDNSMismatch (claim says ['x'], CSR has nothing). The
claim_mismatch sibling test exercises the SAN-dimension via the
CN mismatch path; coverage of explicit SANDNS mismatches stays in
the unit tests in claim_test.go where the helper builds CSRs with
full SANs.
Verification:
* gofmt clean on touched files
* go vet ./internal/scep/intune/... ./internal/api/handler/...: clean
* staticcheck: clean
* go test -count=1 -cover ./internal/scep/intune/...: 95.2%
* 5 golden tests + 3 e2e tests all pass
* No new env vars (G-3 docs guard not triggered)
* No new HTTP routes (openapi-parity guard not triggered)
* Sibling test packages (service + router) still green
Refs: cowork/scep-rfc8894-intune-master-prompt.md::Phase 10
cowork/scep-rfc8894-intune/progress.md