Custom extended key usage for PKI

builtin/logical/pki/cert_util.go

@@ -62,6 +62,7 @@ type creationParameters struct {
 	NotAfter                      time.Time
 	KeyUsage                      x509.KeyUsage
 	ExtKeyUsage                   certExtKeyUsage
+	ExtKeyUsageOIDs               []string
 	PolicyIdentifiers             []string
 	BasicConstraintsValidForNonCA bool
 
@@ -918,6 +919,7 @@ func generateCreationBundle(b *backend, data *dataBundle) error {
 		NotAfter:                      notAfter,
 		KeyUsage:                      x509.KeyUsage(parseKeyUsages(data.role.KeyUsage)),
 		ExtKeyUsage:                   extUsage,
+		ExtKeyUsageOIDs:               data.role.ExtKeyUsageOIDs,
 		PolicyIdentifiers:             data.role.PolicyIdentifiers,
 		BasicConstraintsValidForNonCA: data.role.BasicConstraintsValidForNonCA,
 	}
@@ -989,6 +991,16 @@ func addPolicyIdentifiers(data *dataBundle, certTemplate *x509.Certificate) {
 	}
 }
 
+// addExtKeyUsageOids adds custom extended key usage OIDs to certificate
+func addExtKeyUsageOids(data *dataBundle, certTemplate *x509.Certificate) {
+	for _, oidstr := range data.params.ExtKeyUsageOIDs {
+		oid, err := stringToOid(oidstr)
+		if err == nil {
+			certTemplate.UnknownExtKeyUsage = append(certTemplate.UnknownExtKeyUsage, oid)
+		}
+	}
+}
+
 // Performs the heavy lifting of creating a certificate. Returns
 // a fully-filled-in ParsedCertBundle.
 func createCertificate(data *dataBundle) (*certutil.ParsedCertBundle, error) {
@@ -1045,6 +1057,8 @@ func createCertificate(data *dataBundle) (*certutil.ParsedCertBundle, error) {
 
 	addKeyUsages(data, certTemplate)
 
+	addExtKeyUsageOids(data, certTemplate)
+
 	certTemplate.IssuingCertificateURL = data.params.URLs.IssuingCertificates
 	certTemplate.CRLDistributionPoints = data.params.URLs.CRLDistributionPoints
 	certTemplate.OCSPServer = data.params.URLs.OCSPServers
@@ -1254,6 +1268,8 @@ func signCertificate(data *dataBundle) (*certutil.ParsedCertBundle, error) {
 
 	addKeyUsages(data, certTemplate)
 
+  addExtKeyUsageOids(data, certTemplate)
+
 	var certBytes []byte
 
 	certTemplate.IssuingCertificateURL = data.params.URLs.IssuingCertificates

builtin/logical/pki/path_roles.go

@@ -166,6 +166,12 @@ To remove all key usages from being set, set
 this value to an empty list.`,
 			},
 
+			"ext_key_usage_oids": &framework.FieldSchema{
+				Type:        framework.TypeCommaStringSlice,
+				Default:     []string{},
+				Description: `A comma-separated string or list of extended key usage oids.`,
+			},
+
 			"use_csr_common_name": &framework.FieldSchema{
 				Type:    framework.TypeBool,
 				Default: true,
@@ -451,6 +457,7 @@ func (b *backend) pathRoleCreate(ctx context.Context, req *logical.Request, data
 		UseCSRCommonName:              data.Get("use_csr_common_name").(bool),
 		UseCSRSANs:                    data.Get("use_csr_sans").(bool),
 		KeyUsage:                      data.Get("key_usage").([]string),
+		ExtKeyUsageOIDs:               data.Get("ext_key_usage_oids").([]string),
 		OU:                            data.Get("ou").([]string),
 		Organization:                  data.Get("organization").([]string),
 		Country:                       data.Get("country").([]string),
@@ -495,6 +502,15 @@ func (b *backend) pathRoleCreate(ctx context.Context, req *logical.Request, data
 		return errResp, nil
 	}
 
+	if len(entry.ExtKeyUsageOIDs) > 0 {
+		for _, oidstr := range entry.ExtKeyUsageOIDs {
+			_, err := stringToOid(oidstr)
+			if err != nil {
+				return logical.ErrorResponse(fmt.Sprintf("%q could not be parsed as a valid oid for an extended key usage", oidstr)), nil
+			}
+		}
+	}
+
 	if len(entry.PolicyIdentifiers) > 0 {
 		for _, oidstr := range entry.PolicyIdentifiers {
 			_, err := stringToOid(oidstr)
@@ -588,6 +604,7 @@ type roleEntry struct {
 	RequireCN                     bool          `json:"require_cn" mapstructure:"require_cn"`
 	AllowedOtherSANs              []string      `json:"allowed_other_sans" mapstructure:"allowed_other_sans"`
 	PolicyIdentifiers             []string      `json:"policy_identifiers" mapstructure:"policy_identifiers"`
+	ExtKeyUsageOIDs               []string      `json:"ext_key_usage_oids" mapstructure:"ext_key_usage_oids"`
 	BasicConstraintsValidForNonCA bool          `json:"basic_constraints_valid_for_non_ca" mapstructure:"basic_constraints_valid_for_non_ca"`
 
 	// Used internally for signing intermediates
@@ -616,6 +633,7 @@ func (r *roleEntry) ToResponseData() map[string]interface{} {
 		"key_type":                           r.KeyType,
 		"key_bits":                           r.KeyBits,
 		"key_usage":                          r.KeyUsage,
+		"ext_key_usage_oids":                 r.ExtKeyUsageOIDs,
 		"ou":                                 r.OU,
 		"organization":                       r.Organization,
 		"country":                            r.Country,

ui/app/models/role-pki.js

@@ -55,6 +55,10 @@ export default DS.Model.extend({
     defaultValue: 'DigitalSignature,KeyAgreement,KeyEncipherment',
     editType: 'stringArray',
   }),
+  extKeyUsageOids: attr({
+    label: 'Custom extended key usage OIDs',
+    editType: 'stringArray',
+  }),
   requireCn: attr('boolean', {
     label: 'Require common name',
     defaultValue: true,
@@ -223,7 +227,7 @@ export default DS.Model.extend({
           'allowedDomains',
         ],
       },
-      { 'Extended Key Usage': ['serverFlag', 'clientFlag', 'codeSigningFlag', 'emailProtectionFlag'] },
+      { 'Extended Key Usage': ['serverFlag', 'clientFlag', 'codeSigningFlag', 'emailProtectionFlag', 'extKeyUsageOids'] },
       {
         Advanced: ['generateLease', 'noStore', 'basicConstraintsValidForNonCA', 'policyIdentifiers'],
       },