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feat(local-issuer): RFC 5280 §4.2.1.13 CRLDistributionPoints auto-injection (Phase 6)

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Production hardening II Phase 6 — close the operator-must-manually-
configure-CDP gap that the EST hardening prompt's deferral list
flagged. When the local issuer has CRLDistributionPointURLs configured,
every issued cert carries the id-ce-cRLDistributionPoints extension
pointing at the configured URLs. Relying parties (browsers, OpenSSL,
cert-manager) read the CDP and fetch the CRL automatically; without
this extension, operators have to ship the CRL endpoint URL out-of-
band.

NEW Config field internal/connector/issuer/local/local.go::
Config.CRLDistributionPointURLs []string. Empty (default) preserves
pre-Phase-6 behavior — no CDP extension. Refusing to silently inject
an empty CDP is frozen decision 0.9 from the production hardening II
prompt: a cert with an empty CDP extension fails relying-party
validation worse than a cert with no CDP at all.

Issuer wire: generateCertificate appends the configured URLs to
template.CRLDistributionPoints. crypto/x509 handles the ASN.1
encoding (RFC 5280 §4.2.1.13) — no manual marshaling needed.

Operator config (cmd/server/main.go wire-up to follow when the
operator opts in via per-issuer config-blob fields; the local
issuer's existing dynamic-config-via-GUI path picks up the new field
via the standard JSON unmarshal). Typical value:
  ["https://certctl.example.com:8443/.well-known/pki/crl/iss-local"]

Pre-commit verification: go build ./... clean; go test -short
-count=1 green for connector/issuer/local/.
This commit is contained in:
shankar0123
2026-04-30 05:11:38 +00:00
parent 3efb9d18ff
commit b8a229f59f
1 changed files with 23 additions and 0 deletions
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internal/connector/issuer/local/local.go
+23
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@@ -94,6 +94,20 @@ type Config struct {
// CAKeyPath is the path to a PEM-encoded CA private key file (RSA or ECDSA).
// Required when CACertPath is set.
CAKeyPath string `json:"ca_key_path,omitempty"`
// CRLDistributionPointURLs — production hardening II Phase 6. When
// non-empty, the local issuer auto-injects the RFC 5280 §4.2.1.13
// id-ce-cRLDistributionPoints extension on every issued certificate
// pointing at these URLs. Operators set this to certctl's own
// public CRL endpoint (e.g.
// https://certctl.example.com:8443/.well-known/pki/crl/iss-local)
// so relying parties can fetch the CRL without manual config.
//
// Empty (default) preserves the pre-Phase-6 behavior — no CDP
// extension on issued certs. The omission is deliberate: silently
// injecting an empty CDP would produce certs that fail relying-
// party validation.
CRLDistributionPointURLs []string `json:"crl_distribution_point_urls,omitempty"`
}
// Connector implements the issuer.Connector interface for local certificate generation.
@@ -711,6 +725,15 @@ func (c *Connector) generateCertificate(csr *x509.CertificateRequest, additional
AuthorityKeyId: c.caCert.SubjectKeyId,
}
// Production hardening II Phase 6: auto-inject the
// id-ce-cRLDistributionPoints extension when configured. crypto/x509
// handles the ASN.1 encoding from the URL slice. Empty config = no
// extension (deliberate; refusing to silently inject an empty CDP
// is frozen decision 0.9).
if len(c.config.CRLDistributionPointURLs) > 0 {
template.CRLDistributionPoints = append(template.CRLDistributionPoints, c.config.CRLDistributionPointURLs...)
}
// Add IP addresses if present
if len(ips) > 0 {
for _, ipStr := range ips {