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feat(M11c): crypto policy enforcement — CSR validation, MaxTTL caps, key metadata

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Enforce certificate profile crypto constraints across all 5 issuance paths
(renewal, agent CSR, EST, SCEP). ValidateCSRAgainstProfile() rejects CSRs
with key algorithm/size that don't match profile rules. MaxTTL enforcement
caps certificate validity per issuer connector (Local CA, Vault, step-ca
enforce directly; ACME/DigiCert/Sectigo pass through). Key algorithm and
size are now persisted in certificate_versions for audit compliance.

16 new tests (12 service-layer + 4 Local CA connector). Removes hardcoded
version number from GUI sidebar. Documentation updated across architecture,
features, connectors, and README.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
shankar0123
2026-04-15 21:05:14 -04:00
parent f16a9c767a
commit f2e60b93a3
22 changed files with 779 additions and 70 deletions
Download Patch File Download Diff File Expand all files Collapse all files
internal/connector/issuer/local/local.go
+17 -6
View File
@@ -184,8 +184,8 @@ func (c *Connector) IssueCertificate(ctx context.Context, request issuer.Issuanc
return nil, fmt.Errorf("CSR signature verification failed: %w", err)
}
// Generate certificate with EKUs from request
cert, certPEM, serial, err := c.generateCertificate(csr, request.SANs, request.EKUs)
// Generate certificate with EKUs and MaxTTL from request
cert, certPEM, serial, err := c.generateCertificate(csr, request.SANs, request.EKUs, request.MaxTTLSeconds)
if err != nil {
c.logger.Error("failed to generate certificate", "error", err)
return nil, fmt.Errorf("certificate generation failed: %w", err)
@@ -242,8 +242,8 @@ func (c *Connector) RenewCertificate(ctx context.Context, request issuer.Renewal
return nil, fmt.Errorf("CSR signature verification failed: %w", err)
}
// Generate certificate with EKUs from request
cert, certPEM, serial, err := c.generateCertificate(csr, request.SANs, request.EKUs)
// Generate certificate with EKUs and MaxTTL from request
cert, certPEM, serial, err := c.generateCertificate(csr, request.SANs, request.EKUs, request.MaxTTLSeconds)
if err != nil {
c.logger.Error("failed to generate certificate", "error", err)
return nil, fmt.Errorf("certificate generation failed: %w", err)
@@ -468,7 +468,8 @@ func parsePrivateKey(block *pem.Block) (crypto.Signer, error) {
// generateCertificate creates an X.509 certificate signed by the local CA.
// It uses the CSR subject and adds any additional SANs from the request.
// If ekus is non-empty, those EKUs are used instead of the default serverAuth+clientAuth.
func (c *Connector) generateCertificate(csr *x509.CertificateRequest, additionalSANs []string, ekus []string) (*x509.Certificate, string, string, error) {
// If maxTTLSeconds > 0, the certificate validity is capped to that duration.
func (c *Connector) generateCertificate(csr *x509.CertificateRequest, additionalSANs []string, ekus []string, maxTTLSeconds int) (*x509.Certificate, string, string, error) {
// Generate random serial number
serialNum, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 159))
if err != nil {
@@ -512,11 +513,21 @@ func (c *Connector) generateCertificate(csr *x509.CertificateRequest, additional
// Create certificate template
now := time.Now()
notAfter := now.AddDate(0, 0, c.config.ValidityDays)
// Cap validity to MaxTTLSeconds if profile specifies a maximum
if maxTTLSeconds > 0 {
maxNotAfter := now.Add(time.Duration(maxTTLSeconds) * time.Second)
if maxNotAfter.Before(notAfter) {
notAfter = maxNotAfter
}
}
template := &x509.Certificate{
SerialNumber: serialNum,
Subject: csr.Subject,
NotBefore: now,
NotAfter: now.AddDate(0, 0, c.config.ValidityDays),
NotAfter: notAfter,
KeyUsage: keyUsage,
ExtKeyUsage: resolvedEKUs,
DNSNames: dnsNames,