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9bc845304e561a8b01b7297383728c3b47a89666
4 Commits
| Author | SHA1 | Message | Date | |
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 shankar0123
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9bc845304e |
acme-server: HTTP-01 + DNS-01 + TLS-ALPN-01 challenge validation (Phase 3/7)
Wires up the actual challenge-validation machinery so profiles in
acme_auth_mode='challenge' resolve end-to-end. After this commit,
cert-manager 1.15+ with `solver: http01: ingress` against a
challenge-mode profile completes a real HTTP-01 flow and gets a cert.
DNS-01 + TLS-ALPN-01 share the same code path with the appropriate
validator selection.
Architecture (the load-bearing parts):
- 3 separate semaphore-bounded worker pools (one per challenge type),
so HTTP-01 and DNS-01 can't starve each other under load. Default
weight 10 per type; tunable via CERTCTL_ACME_SERVER_HTTP01_CONCURRENCY,
DNS01_CONCURRENCY, TLSALPN01_CONCURRENCY.
- 30s per-challenge timeout (configurable via PoolConfig.PerChallengeTimeout).
- HTTP-01 validator runs validation.IsReservedIPForDial (newly
exported wrapper preserving the existing private impl byte-for-byte
for the network scanner + ValidateSafeURL paths) on the resolved
IP — both at the initial dial and every redirect hop. SSRF probes
into private IP space are refused before the connect.
- DNS-01 validator uses a dedicated resolver pointed at
CERTCTL_ACME_SERVER_DNS01_RESOLVER (default 8.8.8.8:53) — does
NOT use the system resolver to keep behavior deterministic across
deployments. Wildcard handling: `*.example.com` queries
_acme-challenge.example.com.
- TLS-ALPN-01 validator (RFC 8737) connects with ALPN `acme-tls/1`,
inspects the id-pe-acmeIdentifier extension (OID 1.3.6.1.5.5.7.1.31),
asserts the ASN.1 OCTET STRING value equals SHA-256 of the key
authorization. Cert chain is intentionally NOT validated
(InsecureSkipVerify=true is correct per RFC 8737 — the proof is
in the extension, not the chain). Documented in docs/tls.md L-001
table + the //nolint:gosec comment carries the justification.
SSRF guard: same posture as HTTP-01.
- Validation is asynchronous: handler accepts the POST and returns
200 immediately with status=processing; the worker-pool fires a
callback that updates challenge → authz → order in a fresh
background-context WithinTx. The order auto-promotes to `ready`
when ALL authzs become valid; auto-fails to `invalid` when ANY
authz becomes invalid.
What ships:
- internal/api/acme/challenge.go: KeyAuthorization (RFC 8555 §8.1) +
DNS01TXTRecordValue (§8.4) + TLSALPN01ExtensionValue (RFC 8737 §3)
helpers; IDPEAcmeIdentifierOID; ChallengeProblemFromError mapper
(4-way: connection / dns / tls / incorrectResponse); 9 sentinel
errors covering every named failure mode.
- internal/api/acme/validators.go: ChallengeValidator interface;
Pool dispatcher with 3 semaphores + per-type in-flight + peak
gauges; HTTP01Validator + DNS01Validator + TLSALPN01Validator
implementations; Drain method called from cmd/server/main.go's
shutdown sequence.
- internal/api/acme/validators_test.go: KeyAuthorization round-trip,
DNS01 / TLS-ALPN-01 helper tests, SSRF rejection, bounded-
concurrency saturation test (peak-in-flight ≤ cap), type-isolation
test (HTTP-01 saturation doesn't block DNS-01), UnknownType test,
7-case ChallengeProblemFromError mapping.
- internal/repository/postgres/acme.go: GetChallengeByID +
UpdateChallengeWithTx + UpdateAuthzStatusWithTx.
- internal/service/acme.go: SetValidatorPool wires the *acme.Pool;
RespondToChallenge dispatches with account-ownership assertion +
KeyAuthorization computation + processing-status transition (atomic
+ audit); recordChallengeOutcome callback persists the final
challenge + cascading authz + order-promote/-fail in one WithinTx +
audit row. 4 new metrics.
- internal/api/handler/acme.go: Challenge handler; round-trips
account.JWKPEM through ParseJWKFromPEM to recover the *jose.JSONWebKey
the validator pool needs.
- internal/api/router/router.go + openapi_parity_test.go +
api/openapi-handler-exceptions.yaml: 2 new routes (per-profile +
shorthand for challenge/{chall_id}) with parity exceptions.
- cmd/server/main.go: constructs the Pool at startup with the
per-type concurrency caps from cfg.ACMEServer; ACMEService.ValidatorPool()
accessor exposed for the shutdown drain sequence.
- internal/validation/ssrf.go: exported IsReservedIPForDial wrapper
(private impl unchanged; network scanner + ValidateSafeURL paths
byte-identical with prior behavior).
- docs/tls.md: L-001 InsecureSkipVerify table extended with the
TLS-ALPN-01 validator justification (RFC 8737 §3).
- docs/acme-server.md: phase status updated; endpoints table grows
the challenge row; phases-cross-reference flips Phase 3 → live.
Tests:
- 80%+ coverage on the new files.
- BoundedConcurrency test: 10 challenges submitted against an
HTTP-01 pool of weight 3; observed peak-in-flight ≤ 3, all 10
eventually complete, post-Drain in-flight returns to 0.
- TypeIsolation test: HTTP-01 saturation does NOT block a DNS-01
submission; DNS-01 callback fires within 2s.
- SSRF rejection test: a Validate against `localhost` is refused
before the dial (ErrChallengeReservedIP or ErrChallengeConnection).
Engineering history: cowork/WORKSPACE-CHANGELOG.md "ACME-Server-3".
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shankar0123
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c351bba41a |
acme-server: orders + authorizations + finalize + cert download (Phase 2/7)
Closes the issuance loop in trust_authenticated mode (commits |
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shankar0123
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44a85d6f85 |
acme-server: account resource + JWS verifier (Phase 1b/7)
Layers JWS-authenticated POST machinery onto the Phase 1a foundation
(commit
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shankar0123
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ec88a61274 |
acme-server: foundation — directory + new-nonce + per-profile routing (Phase 1a/7)
First slice of the RFC 8555 ACME server endpoint (master plan at cowork/acme-server-endpoint-prompt.md, per-phase prompts at cowork/acme-server-prompts/). This commit lands the smallest viable end-to-end deployable slice: an ACME client running curl -sk https://certctl/acme/profile/<id>/directory curl -sk -I https://certctl/acme/profile/<id>/new-nonce successfully fetches the directory document and a Replay-Nonce. Account creation, JWS verification, orders, challenges, and revocation are all out of scope for this phase and arrive in Phases 1b–4. Closes the Rank 1 LHF from the 2026-05-03 Infisical deep-research (cowork/infisical-deep-research-results.md). Pre-fix, certctl was an ACME consumer only — no /acme/directory endpoint, no JWS verifier, no challenge validators. K8s customers running cert-manager could not point at certctl as an ACME issuer; they had to deploy a certctl agent on every node. What ships: - internal/api/acme/{directory,nonce,errors}.go (+ tests). - internal/api/handler/acme.go + acme_handler_test.go. - internal/repository/postgres/acme.go (nonce ops only — Phase 1b extends with account CRUD; Phases 2-4 extend with order / authz / challenge CRUD). - internal/service/acme.go (BuildDirectory + IssueNonce stubs; Phase 1b adds VerifyJWS / NewAccount / etc.). - migrations/000025_acme_server.{up,down}.sql ships the full 5-table ACME schema (acme_accounts / acme_orders / acme_authorizations / acme_challenges / acme_nonces) PLUS the per-profile certificate_profiles.acme_auth_mode column. Phase 1a actively uses only acme_nonces; remaining tables are empty until Phases 1b-4 plug in. - internal/config/config.go: ACMEServerConfig struct + ACMEServer field on Config. Env vars use CERTCTL_ACME_SERVER_* prefix to avoid colliding with the existing consumer-side ACMEConfig at config.go:1746 (CERTCTL_ACME_DIRECTORY_URL / PROFILE / CHALLENGE_TYPE etc.). Phase 1a wires Enabled + DefaultAuthMode + DefaultProfileID + NonceTTL + DirectoryMeta; Order/Authz TTLs + per-challenge-type concurrency caps + DNS01 resolver are reserved fields parsed in 1a so operators can set them ahead of Phases 2/3. - cmd/server/main.go: wire ACMEHandler into the HandlerRegistry literal alongside the existing certificate / EST / SCEP / etc. handlers. - internal/api/router/router.go: HandlerRegistry.ACME field + 6 Register calls (3 per-profile + 3 shorthand). - internal/api/router/openapi_parity_test.go: 6 new entries in SpecParityExceptions. ACME is a wire-protocol surface (JWS-signed JSON over HTTPS per RFC 7515) whose semantics are dictated by RFC 8555 + RFC 9773 rather than by an OpenAPI document, same precedent as SCEP/EST. The canonical reference is docs/acme-server.md. - docs/acme-server.md: Phase-1a-shaped reference. Configuration table for every CERTCTL_ACME_SERVER_* env var. Per-profile auth-mode decision tree skeleton. TLS trust bootstrap section flagging cert-manager's ClusterIssuer.spec.acme.caBundle requirement (the single biggest first-time-deploy footgun; the full cert-manager walkthrough lands in Phase 6 but the requirement is documented up front). Architecture decisions baked in: - URL family is /acme/profile/<id>/* (per-profile, canonical) with /acme/* shorthand active when CERTCTL_ACME_SERVER_DEFAULT_PROFILE_ID is set. Path matches existing per-profile precedent in EST + SCEP. - Auth mode is per-profile (acme_auth_mode column on certificate_profiles), NOT server-wide. One certctl-server can serve trust_authenticated for an internal-PKI profile and challenge for a public-trust-style profile simultaneously. The column is read at request time, not cached at server start — operators flipping a profile's mode via SQL take effect on the next order without restart. - Nonces are DB-backed (acme_nonces table). Survive server restart. The RFC 8555 §6.5 replay defense requires the store to outlast the client's nonce caching window; an in-memory-only nonce store would lose every in-flight order on restart. - Per-op atomic counters on service.ACMEService.Metrics() — certctl_acme_directory_total, certctl_acme_directory_failures_total, certctl_acme_new_nonce_total, certctl_acme_new_nonce_failures_total. Naming follows certctl frozen decision 0.10 cardinality discipline. Phase 1b will extend with new_account counters; Phase 2 with order / finalize / cert; Phase 3 with per-challenge-type counters. Audit fixes #11 + #12 (cowork/acme-server-prompts/audit-additions.md) applied: - #11: CERTCTL_ACME_SERVER_* prefix avoids the consumer-side CERTCTL_ACME_* namespace collision. - #12: prior-attempt WIP from two failed Phase-1 dispatches was discarded at phase start; this commit starts from a clean tree. Tests: - 14 unit tests in internal/api/acme/ (directory, nonce, errors). - 7 handler-level tests via httptest.NewServer + mockACMEService (mirrors the mockSCEPService pattern at scep_handler_test.go). - 7 service-layer tests with mocked repo + injected profileLookup. - All pass under -race -count=1 -short. Deferred to Phase 1b: - JWS verification (go-jose v4 — see master-prompt §8a for the API surface and audit doc for the speculation pitfalls). - new-account / account/<id> endpoints + AccountService. - Nonce *consumption* path (issue path is in this commit; consume is only invoked by JWS-verified POSTs which Phase 1b adds). Engineering history: cowork/WORKSPACE-CHANGELOG.md "ACME-Server-1a". Per-phase implementation plan: cowork/acme-server-prompts/. Master plan + audit fixes: cowork/acme-server-endpoint-prompt.md + cowork/acme-server-prompt-audit.md + cowork/acme-server-prompts/audit-additions.md. |