Support for mapping user from TLS client certificate

server/auth.go

@@ -261,6 +261,7 @@ func (s *Server) isClientAuthorized(c *client) bool {
 	authorization := s.opts.Authorization
 	username := s.opts.Username
 	password := s.opts.Password
+	tlsMap := s.opts.TLSMap
 	s.optsMu.RUnlock()
 
 	// Check custom auth first, then jwts, then nkeys, then multiple users, then token, then single user/pass.
@@ -318,11 +319,48 @@ func (s *Server) isClientAuthorized(c *client) bool {
 			s.mu.Unlock()
 			return false
 		}
-	} else if hasUsers && c.opts.Username != "" {
-		user, ok = s.users[c.opts.Username]
-		if !ok {
-			s.mu.Unlock()
-			return false
+	} else if hasUsers {
+		// Check if we are tls verify and are mapping users from the client_certificate
+		if tlsMap {
+			tlsState := c.GetTLSConnectionState()
+			if tlsState == nil {
+				c.Debugf("User required in cert, no TLS connection state")
+				s.mu.Unlock()
+				return false
+			}
+			if len(tlsState.PeerCertificates) == 0 {
+				c.Debugf("User required in cert, no peer certificates found")
+				s.mu.Unlock()
+				return false
+			}
+			cert := tlsState.PeerCertificates[0]
+			if len(tlsState.PeerCertificates) > 1 {
+				c.Debugf("Multiple peer certificates found, selecting first")
+			}
+			if len(cert.EmailAddresses) == 0 {
+				c.Debugf("User required in cert, none found")
+				s.mu.Unlock()
+				return false
+			}
+			euser := cert.EmailAddresses[0]
+			user, ok = s.users[euser]
+			if !ok {
+				c.Debugf("User in cert [%q], not found", euser)
+				s.mu.Unlock()
+				return false
+			}
+			if len(cert.EmailAddresses) > 1 {
+				c.Debugf("Multiple users found in cert, selecting first [%q]", euser)
+			}
+			if c.opts.Username != "" {
+				s.Warnf("User found in connect proto, but user required from cert - %v", c)
+			}
+		} else if c.opts.Username != "" {
+			user, ok = s.users[c.opts.Username]
+			if !ok {
+				s.mu.Unlock()
+				return false
+			}
 		}
 	}
 	s.mu.Unlock()

server/config_check_test.go

@@ -612,33 +612,6 @@ func TestConfigCheck(t *testing.T) {
 			errorLine: 14,
 			errorPos:  11,
 		},
-		{
-			name: "when account user within accounts block has no user, pass",
-			config: `
-		accounts {
-
-		  #
-		  # synadia > nats.io, cncf
-		  #
-		  synadia {
-		    # SAADJL5XAEM6BDYSWDTGVILJVY54CQXZM5ZLG4FRUAKB62HWRTPNSGXOHA
-		    nkey = "AC5GRL36RQV7MJ2GT6WQSCKDKJKYTK4T2LGLWJ2SEJKRDHFOQQWGGFQL"
-
-		    users [
-		      {
-		      }
-		    ]
-
-		    exports = [
-		      { service: "synadia.requests", accounts: [nats, cncf] }
-		    ]
-		  }
-		}
-				`,
-			err:       errors.New(`User entry requires a user and a password`),
-			errorLine: 13,
-			errorPos:  10,
-		},
 		{
 			name: "when accounts block has unknown fields",
 			config: `

server/opts.go

@@ -123,6 +123,7 @@ type Options struct {
 	TLSTimeout       float64       `json:"tls_timeout"`
 	TLS              bool          `json:"-"`
 	TLSVerify        bool          `json:"-"`
+	TLSMap           bool          `json:"-"`
 	TLSCert          string        `json:"-"`
 	TLSKey           string        `json:"-"`
 	TLSCaCert        string        `json:"-"`
@@ -227,6 +228,7 @@ type TLSConfigOpts struct {
 	KeyFile          string
 	CaFile           string
 	Verify           bool
+	Map              bool
 	Timeout          float64
 	Ciphers          []uint16
 	CurvePreferences []tls.CurveID
@@ -238,10 +240,11 @@ TLS configuration is specified in the tls section of a configuration file:
 e.g.
 
     tls {
-        cert_file: "./certs/server-cert.pem"
-        key_file:  "./certs/server-key.pem"
-        ca_file:   "./certs/ca.pem"
-        verify:    true
+        cert_file:      "./certs/server-cert.pem"
+        key_file:       "./certs/server-key.pem"
+        ca_file:        "./certs/ca.pem"
+        verify:         true
+        verify_and_map: true
 
         cipher_suites: [
             "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
@@ -457,6 +460,7 @@ func (o *Options) ProcessConfigFile(configFile string) error {
 				continue
 			}
 			o.TLSTimeout = tc.Timeout
+			o.TLSMap = tc.Map
 		case "write_deadline":
 			wd, ok := v.(string)
 			if ok {
@@ -1610,9 +1614,9 @@ func parseUsers(mv interface{}, opts *Options, errors *[]error, warnings *[]erro
 			}
 		}
 
-		// Check to make sure we have at least username and password if defined.
-		if nkey.Nkey == "" && (user.Username == "" || user.Password == "") {
-			return nil, nil, &configErr{tk, fmt.Sprintf("User entry requires a user and a password")}
+		// Check to make sure we have at least an nkey or username <password> defined.
+		if nkey.Nkey == "" && user.Username == "" {
+			return nil, nil, &configErr{tk, fmt.Sprintf("User entry requires a user")}
 		} else if nkey.Nkey != "" {
 			// Make sure the nkey a proper public nkey for a user..
 			if !nkeys.IsValidPublicUserKey(nkey.Nkey) {
@@ -1871,6 +1875,13 @@ func parseTLS(v interface{}) (*TLSConfigOpts, error) {
 				return nil, &configErr{tk, fmt.Sprintf("error parsing tls config, expected 'verify' to be a boolean")}
 			}
 			tc.Verify = verify
+		case "verify_and_map":
+			verify, ok := mv.(bool)
+			if !ok {
+				return nil, &configErr{tk, fmt.Sprintf("error parsing tls config, expected 'verify_and_map' to be a boolean")}
+			}
+			tc.Verify = verify
+			tc.Map = verify
 		case "cipher_suites":
 			ra := mv.([]interface{})
 			if len(ra) == 0 {

test/configs/certs/client-id-auth-cert.pem

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIE7DCCAtSgAwIBAgIJAO+k4G7bNTy5MA0GCSqGSIb3DQEBBQUAMIGLMQswCQYD
+VQQGEwJVUzELMAkGA1UECBMCQ0ExFjAUBgNVBAcTDVNhbiBGcmFuY2lzY28xEzAR
+BgNVBAoTCkFwY2VyYSBJbmMxEDAOBgNVBAsTB25hdHMuaW8xEjAQBgNVBAMTCWxv
+Y2FsaG9zdDEcMBoGCSqGSIb3DQEJARYNZGVyZWtAbmF0cy5pbzAeFw0xODEyMjAw
+MDQwMjZaFw0xOTAxMTkwMDQwMjZaMIGaMQswCQYDVQQGEwJVUzELMAkGA1UECAwC
+Q0ExFDASBgNVBAcMC0xvcyBBbmdlbGVzMSQwIgYDVQQKDBtTeW5hZGlhIENvbW11
+bmljYXRpb25zIEluYy4xEDAOBgNVBAsMB05BVFMuaW8xEjAQBgNVBAMMCWxvY2Fs
+aG9zdDEcMBoGCSqGSIb3DQEJARYNZGVyZWtAbmF0cy5pbzCCASIwDQYJKoZIhvcN
+AQEBBQADggEPADCCAQoCggEBAJzsochRXgyF2qQsVNfL/H84pvhDYTqMarYSijUe
+CHUxVi4nNxQsr9Z0SrtzjaeiJ9uOH1vDpzTevsI1Akv6tUiZxgFhxUv79cbO1WNF
+fzwXANzDHwOxyEnSSl3X5HN+L67cgc+chof7tc+c1KqVYXPpJy0hSvCY6o1W0IbE
+4KeR7m6kNh6jPvQAPz00jZeUVIenE3zuMrLeLnTqdhWrZwjme8FybH1sxMQu1T3v
+SI0mhl7Xmkct0UTH11dJ4azrgmddxI0ZBIXAlQA3PTY4QyKiqR4V95wkEwn5hq3a
+XCB5YT9XHYGI/An8Dkotqn/7fjQ2h7BqW6qevQOu8ce52B0CAwEAAaNCMEAwKQYD
+VR0RBCIwIIIJbG9jYWxob3N0hwR/AAABgQ1kZXJla0BuYXRzLmlvMBMGA1UdJQQM
+MAoGCCsGAQUFBwMCMA0GCSqGSIb3DQEBBQUAA4ICAQBbBvhUFoVOgP+1qTUMIYCQ
+hjtLOogW/tOXO6FIxFr3WEtf5WOc+Ko/FiwfsLyS0HTXvz7C7S4KRtgXLBVRjSy+
+FJdUKiCVeuZ3ZjUl2b7rLj/36N+cClz0Ipy7FKyN0ww1sscWDL1F1E65tv+LnnQ1
+p0dDIsHEbz968t0hVoUzPs1DJNKdU1K482mTPjjTbwEvt59keITRy2rV+vKxt1n2
+szfovqllHDGrvlZnT7kGYTvWHa3NkL5AdLmVb51PFcN+LpWykyQsZN1Zr5x5GbHj
+UQVhrnJUJOWtI5HmXfhlwUZZtUezgAvpTEkjqT+yrL1PbN61uvBXHI8piZG3Vnu1
+QS/KT2aptmb/W5KH2EkrldvVKYOSyo0lDxBu8ZGYQCJnaI+vtpCIVZSv9LkMJNDf
+NQSCjwoVfqSlaOg/b+HMaDmOaGtpYyHEJ45WgtZxU+GYdJX9XLgef/1WyG9wP9fg
+/Uki2D5QqRhWZ1SA3C8zItcfLhfVbOj3RX69FRO8RcxEjLOJzQztbOdpesbEMFmV
+rBYnOP4N4lBtou0f8m5TZu8tbTk1UypdS/TqZNPk/XC/xU/oj+XRcOxg7fK5MJLw
+xKF/EjGP5K81KnE140uvaeoVkD5MbxFygUuvArXzuiLEf5Kydf9zT/AymNc6ySEi
+kt4g8+vpo1BX4/lTyI6dKQ==
+-----END CERTIFICATE-----

test/configs/certs/client-id-auth-key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

test/configs/tls_cert_id.conf

@@ -0,0 +1,24 @@
+# TLS config file
+# We require client certs and pull the user from the cert itself.
+
+listen: 127.0.0.1:9333
+
+tls {
+  # Server cert
+  cert_file: "./configs/certs/server-cert.pem"
+  # Server private key
+  key_file:  "./configs/certs/server-key.pem"
+  # Specified time for handshake to complete
+  timeout: 2
+  # Optional certificate authority for clients
+  ca_file:   "./configs/certs/ca.pem"
+  # Require a client certificate and map user id from certificate
+  verify_and_map: true
+}
+
+# User authenticated from above in certificate.
+authorization {
+  users = [
+    {user: derek@nats.io, permissions: { publish:"foo" }}
+  ]
+}

test/tls_test.go

@@ -117,6 +117,19 @@ func TestTLSClientCertificate(t *testing.T) {
 	defer nc.Close()
 }
 
+func TestTLSClientCertificateHasUserID(t *testing.T) {
+	srv, opts := RunServerWithConfig("./configs/tls_cert_id.conf")
+	defer srv.Shutdown()
+	nurl := fmt.Sprintf("tls://%s:%d", opts.Host, opts.Port)
+	nc, err := nats.Connect(nurl,
+		nats.ClientCert("./configs/certs/client-id-auth-cert.pem", "./configs/certs/client-id-auth-key.pem"),
+		nats.RootCAs("./configs/certs/ca.pem"))
+	if err != nil {
+		t.Fatalf("Expected to connect, got %v", err)
+	}
+	defer nc.Close()
+}
+
 func TestTLSVerifyClientCertificate(t *testing.T) {
 	srv, opts := RunServerWithConfig("./configs/tlsverify_noca.conf")
 	defer srv.Shutdown()