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2 Commits
| Author | SHA1 | Message | Date | |
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 shankar0123
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a12a437664 |
feat(scep): mTLS sibling route /scep-mtls/<pathID> (opt-in)
SCEP RFC 8894 + Intune master bundle — Phase 6.5 of 14 (opt-in,
enterprise-procurement-checkbox).
Closes the procurement-team objection that 'shared password
authentication' is a checkbox-fail regardless of how strong the
password is. The clean answer: a sibling route that adds client-cert
auth at the handler layer AND keeps the challenge password (defense in
depth, not replacement). Devices present a bootstrap cert from a
trusted CA (e.g. a manufacturing-time cert), then SCEP-enroll for
their long-lived cert. Same model Apple's MDM and Cisco's BRSKI use.
internal/config/config.go
* SCEPProfileConfig gains MTLSEnabled bool + MTLSClientCATrustBundlePath
string. Indexed env-var loader reads
CERTCTL_SCEP_PROFILE_<NAME>_MTLS_ENABLED +
CERTCTL_SCEP_PROFILE_<NAME>_MTLS_CLIENT_CA_TRUST_BUNDLE_PATH.
* Validate() refuses MTLSEnabled=true with empty bundle path —
structural defense in depth ahead of the file-content preflight.
cmd/server/main.go
* preflightSCEPMTLSTrustBundle: file existence + PEM parse + ≥1
CERTIFICATE block + non-expired check. Returns the parsed
*x509.CertPool ready to inject into the per-profile SCEPHandler.
Failures os.Exit(1) with the offending PathID in the structured log.
* SCEP startup loop walks each profile; when MTLSEnabled, runs
preflight, builds the per-profile pool, contributes the bundle's
certs to the union pool that backs the TLS-layer
VerifyClientCertIfGiven, clones the SCEPHandler with
SetMTLSTrustPool, and registers the parallel sibling route via
apiRouter.RegisterSCEPMTLSHandlers.
* Union pool published to outer scope as scepMTLSUnionPoolForTLS;
passed to buildServerTLSConfigWithMTLS so the listener serves both
/scep[/<pathID>] (no client cert) and /scep-mtls/<pathID>
(cert required at handler layer) on the same socket.
* Final-handler dispatch gains /scep-mtls + /scep-mtls/* prefix
routing through the no-auth chain (auth boundary is the client
cert + challenge password, NOT a Bearer token).
cmd/server/tls.go
* New buildServerTLSConfigWithMTLS that wraps buildServerTLSConfig
+ sets ClientCAs + ClientAuth=VerifyClientCertIfGiven when a
non-nil pool is passed. nil pool = identical TLS shape to the
pre-Phase-6.5 builder (no behavior change for deploys without
mTLS profiles).
* Critical: VerifyClientCertIfGiven (NOT RequireAndVerifyClientCert)
so a client that doesn't present a cert can still hit the standard
/scep route. The per-profile gate at the handler layer enforces
'cert required' on /scep-mtls/<pathID>.
internal/api/handler/scep.go
* SCEPHandler gains mtlsTrustPool *x509.CertPool field +
SetMTLSTrustPool method. Per-profile pool injected by
cmd/server/main.go after preflight.
* HandleSCEPMTLS wrapper: gates on r.TLS.PeerCertificates non-empty
+ per-profile cert.Verify against THIS profile's pool. Returns
HTTP 401 for missing/untrusted cert (mTLS failure is auth, not
authorization). Returns HTTP 500 if mtlsTrustPool is nil (deploy
bug — the route shouldn't have been registered). On success
delegates to HandleSCEP — defense in depth: mTLS is additive,
NOT replacement; the standard SCEP code path including the
challenge-password gate still executes.
* Per-profile re-verification via cert.Verify(...) is critical:
the TLS layer verified against the UNION pool, so a cert that
chains to profile A's bundle would pass TLS even when targeting
profile B. The handler-layer gate prevents cross-profile
bleed-through.
internal/api/router/router.go
* AuthExemptDispatchPrefixes gains '/scep-mtls' (auth boundary is
client cert + challenge password, NOT Bearer token).
* RegisterSCEPMTLSHandlers parallel to RegisterSCEPHandlers:
empty PathID maps to /scep-mtls root; non-empty maps to
/scep-mtls/<pathID>. Each handler in the map MUST have had
SetMTLSTrustPool called.
internal/api/router/openapi_parity_test.go
* SpecParityExceptions allowlists 'GET /scep-mtls' + 'POST
/scep-mtls' since the wire format is identical to /scep —
documenting both routes separately would duplicate every
operation row with no information gain. Documented alternative
in docs/legacy-est-scep.md.
internal/api/handler/scep_mtls_test.go (new, ~210 LoC)
* 6 tests + 2 helpers covering the auth contract:
1. RejectsMissingClientCert — request with r.TLS=nil → 401
2. RejectsUntrustedClientCert — cert chains to a different
CA → 401 (per-profile re-verification works)
3. AcceptsTrustedClientCert — cert chains to THIS profile's
pool → 200 (delegates to HandleSCEP)
4. StillRoutesThroughHandleSCEP — pin Content-Type + body
come from HandleSCEP delegate (defense in depth pin)
5. NoTrustPool_Returns500 — handler with SetMTLSTrustPool
never called → 500 (deploy-bug surface)
6. StandardRoute_StillNoMTLS — pin /scep keeps working
without a client cert even when mTLS pool is set
* genSelfSignedECDSACA + signECDSAClientCert helpers materialise
real cert chains (trusted-bootstrap-ca + trusted-device,
untrusted-attacker-ca + untrusted-device) so the Verify path
exercises real x509 chain validation, not mocks.
docs/features.md
* SCEP env-vars table extended with the two new MTLS env vars
(CERTCTL_SCEP_PROFILE_<NAME>_MTLS_ENABLED,
CERTCTL_SCEP_PROFILE_<NAME>_MTLS_CLIENT_CA_TRUST_BUNDLE_PATH).
Closes the G-3 'env var defined in Go but never documented' gate.
docs/legacy-est-scep.md
* New 'mTLS sibling route (Phase 6.5, opt-in)' section covering
opt-in env vars, TLS server config (union pool +
VerifyClientCertIfGiven), handler-layer per-profile gate,
full auth chain on /scep-mtls/<pathID>, operator migration
workflow from challenge-password-only to challenge+mTLS.
cowork/CLAUDE.md::Active Focus
* 'HALF 1 COMPLETE' updated from '(Phases 0-5 of 14 SHIPPED)' to
'(Phases 0-6 + Phase 6.5 of 14 SHIPPED)'.
Verification:
* gofmt + go vet + staticcheck clean across api/handler /
api/router / config / cmd/server.
* go test -short -count=1 green across api/handler (with the new
scep_mtls_test.go) / api/router / service / config / pkcs7 /
cmd/server / connector/issuer/local.
* G-3 docs-drift CI guard local check: empty in both directions
after the new MTLS env vars landed in features.md.
* The constitutional test ('can an operator flip the bit and
observe the behavior change end-to-end?') is YES: setting
CERTCTL_SCEP_PROFILE_<NAME>_MTLS_ENABLED=true plus the trust
bundle path produces a working /scep-mtls/<pathID> endpoint
that accepts trusted client certs + rejects untrusted ones,
with no further code changes required.
Phase 6.5 of 14 in SCEP RFC 8894 + Intune master bundle.
Half 1 (Phases 0-6 + 6.5) is now FEATURE-COMPLETE for the
ChromeOS / general-MDM use case. Half 2 (Phases 7-12) adds the
Microsoft Intune dynamic-challenge layer.
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shankar0123
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e720474fb7 |
Bundle D: Documentation & transparency sweep — 8 findings closed
Closes H-009 + L-001 + L-007 + L-008 + L-016 + L-017 + L-018 + M-027
from comprehensive-audit-2026-04-25.
H-009 — README JWT verified-already-clean
README has zero JWT mentions at audit time. docs/architecture.md
correctly documents JWT/OIDC integration via authenticating-gateway
pattern (line 905-912).
.github/workflows/ci.yml: new step
'Forbidden README JWT advertising regression guard (H-009)'
greps README for JWT-as-supported phrasing; passes verbatim
(gateway / pre-G-1) but fails build on net-new advertising.
L-001 (CWE-295) — InsecureSkipVerify per-site justification
Audit count was 8; recon found 13 production sites.
docs/tls.md: new 'InsecureSkipVerify justifications' table
enumerates each site by file:line with per-site rationale.
cmd/agent/verify.go:78, internal/tlsprobe/probe.go:54,
internal/service/network_scan.go:460: each previously-bare
InsecureSkipVerify: true now carries //nolint:gosec.
.github/workflows/ci.yml: new step
'Forbidden bare InsecureSkipVerify regression guard (L-001)'
fails build if any net-new ISV lands in non-test .go without
nolint:gosec on the same or preceding line.
L-007 — README dependency-audit commands
README.md: new Dependencies section with go list -m all | wc -l,
go mod why, govulncheck ./.... Honors operating-rules invariant.
L-008 — Release-time govulncheck gate
.github/workflows/release.yml: new 'Install govulncheck' +
'Run govulncheck (release gate)' steps in the matrix job.
Pinned to same install path as ci.yml. Default exit code
semantics (fail on called-vuln only, deferred-call advisories
tracked on master via L-021) keeps the gate appropriate.
L-016 — architecture.md drift fixes
docs/architecture.md: system-components diagram's '21 tables'
annotation removed (current 23; replaced with TEXT-keys
descriptor); connector-architecture '9 connectors' prose
replaced with grep ref + current 12-issuer list (added
Entrust/GlobalSign/EJBCA which were missing); API-design
'97 operations / 107 total' replaced with grep commands.
Connector subgraphs verified-current at 12/13/6.
L-017 — workspace CLAUDE.md verified-already-clean
Bundle B's pre-commit-gate refactor already converted current-
state numeric claims to grep commands. Phase 0 recon confirmed
zero remaining hardcoded counts.
L-018 — Defect age table
cowork/comprehensive-audit-2026-04-25/defect-age.md (NEW):
Tabulates all 9 High findings with first-mentioned commit,
closing bundle, days-open. Methodology snippet for re-running.
Key finding: 8 of 9 closed within 24h of audit publication.
M-027 — OpenAPI parity verified-already-clean
Audit's 'router 121 vs OpenAPI 125 — 4-op gap' was wrong
methodology. The 4-op 'gap' was exactly the 4 routes registered
via r.mux.Handle (auth-exempt allowlist) instead of r.Register.
When you count both dispatch shapes the totals match exactly.
internal/api/router/openapi_parity_test.go (NEW):
TestRouter_OpenAPIParity AST-walks router.go for both
Register and mux.Handle calls + walks api/openapi.yaml's
path/method nesting + asserts the sets match. Adding a route
without updating the spec fails CI permanently.
Audit deliverables:
audit-report.md: score 38/55 -> 46/55 closed
(High 7/9 -> 8/9; Medium 20/27 -> 21/27; Low 8/19 -> 14/19)
findings.yaml: 8 status flips open -> closed
defect-age.md: new file
certctl/CHANGELOG.md: Bundle D section
Verification:
TestRouter_OpenAPIParity PASS
L-001 grep guard self-test (after //nolint:gosec adds) PASS
H-009 grep guard self-test PASS
go test -count=1 -short on changed packages green
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