{"record":{"id":"c8436110f6896ed9","repo":"hashicorp/nomad","slug":"error-generating-ca-certificate-s","errorCode":null,"errorMessage":"error generating CA certificate: %s","messagePattern":"error generating CA certificate: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"helper/tlsutil/generate.go","lineNumber":195,"sourceCode":"\t\t\tCommonName:         opts.Name,\n\t\t},\n\t\tBasicConstraintsValid: true,\n\t\tKeyUsage:              x509.KeyUsageCertSign | x509.KeyUsageCRLSign | x509.KeyUsageDigitalSignature,\n\t\tIsCA:                  true,\n\t\tNotAfter:              time.Now().AddDate(0, 0, opts.Days),\n\t\tNotBefore:             time.Now(),\n\t\tAuthorityKeyId:        id,\n\t\tSubjectKeyId:          id,\n\t}\n\n\tif len(opts.PermittedDNSDomains) > 0 {\n\t\ttemplate.PermittedDNSDomainsCritical = true\n\t\ttemplate.PermittedDNSDomains = opts.PermittedDNSDomains\n\t}\n\tbs, err := x509.CreateCertificate(\n\t\trand.Reader, &template, &template, signer.Public(), signer)\n\tif err != nil {\n\t\treturn \"\", \"\", fmt.Errorf(\"error generating CA certificate: %s\", err)\n\t}\n\n\tvar buf bytes.Buffer\n\terr = pem.Encode(&buf, &pem.Block{Type: \"CERTIFICATE\", Bytes: bs})\n\tif err != nil {\n\t\treturn \"\", \"\", fmt.Errorf(\"error encoding private key: %s\", err)\n\t}\n\n\treturn buf.String(), pk, nil\n}\n\n// GenerateCert generates a new certificate for agent TLS (not to be confused with Connect TLS)\nfunc GenerateCert(opts CertOpts) (string, string, error) {\n\tparent, err := parseCert(opts.CA)\n\tif err != nil {\n\t\treturn \"\", \"\", err\n\t}\n","sourceCodeStart":177,"sourceCodeEnd":213,"githubUrl":"https://github.com/hashicorp/nomad/blob/482b49bf1aec006f089bcfc7e632d8f6ac303e5e/helper/tlsutil/generate.go#L177-L213","documentation":"GenerateCA failed at the x509.CreateCertificate step when building the self-signed CA certificate. The crypto/x509 layer rejected the template/signer combination, and the underlying Go error is wrapped into this message. It means the CA could not be minted at all, so no cert or key material is returned.","triggerScenarios":"Calling helper/tlsutil.GenerateCA with a template the x509 package rejects: invalid validity window (NotAfter before NotBefore), malformed PermittedDNSDomains with PermittedDNSDomainsCritical=true, unsupported key type for the signer, or rand.Reader failure.","commonSituations":"Passing zero/negative Duration so NotAfter precedes NotBefore; misconfigured name-constraint domains; generating CAs on systems with a broken entropy source; custom callers building templates with unsupported extensions.","solutions":["Read the wrapped %s detail from x509.CreateCertificate and fix the offending template field (most often the validity window or PermittedDNSDomains).","Ensure opts.Duration is positive so template.NotAfter is after NotBefore.","Verify PermittedDNSDomains entries are valid DNS names (no schemes, wildcards only as leading *.).","Check the signer passed to GenerateCA is a valid ecdsa or rsa key generated with the matching GeneratePrivateKey.","Confirm the host entropy/PRNG is functional (rand.Reader errors are rare but possible)."],"exampleFix":"// before\ncaCert, _, err := tlsutil.GenerateCA(tlsutil.CAOpts{Duration: 0})\n// after\ncaCert, _, err := tlsutil.GenerateCA(tlsutil.CAOpts{Duration: 6 * 30 * 24 * time.Hour})","handlingStrategy":"validation","validationCode":"func validCAOpts(o tlsutil.CAOpts) error {\n\tif o.Duration <= 0 { return fmt.Errorf(\"CA duration must be positive\") }\n\tfor _, d := range o.PermittedDNSDomains {\n\t\tif d == \"\" { return fmt.Errorf(\"empty permitted DNS domain\") }\n\t}\n\tswitch o.Name {\n\tcase \"\": return fmt.Errorf(\"CA name required\")\n\t}\n\treturn nil\n}","typeGuard":null,"tryCatchPattern":"caCert, pk, err := tlsutil.GenerateCA(opts)\nif err != nil {\n\tif strings.Contains(err.Error(), \"error generating CA certificate\") {\n\t\treturn fmt.Errorf(\"CA template rejected by x509: %w\", err)\n\t}\n\treturn err\n}","preventionTips":["Always pass a positive Duration to GenerateCA.","Use the library's GeneratePrivateKey for the signer so the key type is supported.","Validate PermittedDNSDomains entries are plain DNS names.","Log the wrapped x509 error detail when diagnosing template problems."],"tags":["tls","x509","certificate-generation"],"backgroundTag":"x509-certificate-creation-failed","analyzedSha":"482b49bf1aec006f089bcfc7e632d8f6ac303e5e","analyzedAt":"2026-09-04T07:54:14.808Z","contentChangedAt":"2026-09-04T07:54:14.808Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}