Load WgPort from config file and exchange via signal (#449)

Added additional common blacklisted interfaces

Updated the signal protocol to pass the peer port and netbird version

Co-authored-by: braginini <bangvalo@gmail.com>

client/internal/config.go

@@ -37,6 +37,7 @@ type Config struct {
 	ManagementURL  *url.URL
 	AdminURL       *url.URL
 	WgIface        string
+	WgPort         int
 	IFaceBlackList []string
 	// SSHKey is a private SSH key in a PEM format
 	SSHKey string
@@ -49,7 +50,13 @@ func createNewConfig(managementURL, adminURL, configPath, preSharedKey string) (
 	if err != nil {
 		return nil, err
 	}
-	config := &Config{SSHKey: string(pem), PrivateKey: wgKey, WgIface: iface.WgInterfaceDefault, IFaceBlackList: []string{}}
+	config := &Config{
+		SSHKey:         string(pem),
+		PrivateKey:     wgKey,
+		WgIface:        iface.WgInterfaceDefault,
+		WgPort:         iface.DefaultWgPort,
+		IFaceBlackList: []string{},
+	}
 	if managementURL != "" {
 		URL, err := ParseURL("Management URL", managementURL)
 		if err != nil {
@@ -72,8 +79,8 @@ func createNewConfig(managementURL, adminURL, configPath, preSharedKey string) (
 		config.AdminURL = newURL
 	}
 
-	config.IFaceBlackList = []string{iface.WgInterfaceDefault, "tun0", "zt", "ZeroTier", "utun", "wg", "ts",
-		"Tailscale", "tailscale"}
+	config.IFaceBlackList = []string{iface.WgInterfaceDefault, "wt", "utun", "tun0", "zt", "ZeroTier", "utun", "wg", "ts",
+		"Tailscale", "tailscale", "docker", "vet"}
 
 	err = util.WriteJson(configPath, config)
 	if err != nil {
@@ -150,6 +157,11 @@ func ReadConfig(managementURL, adminURL, configPath string, preSharedKey *string
 		refresh = true
 	}
 
+	if config.WgPort == 0 {
+		config.WgPort = iface.DefaultWgPort
+		refresh = true
+	}
+
 	if refresh {
 		// since we have new management URL, we need to update config file
 		if err := util.WriteJson(configPath, config); err != nil {

client/internal/connect.go

@@ -188,7 +188,7 @@ func createEngineConfig(key wgtypes.Key, config *Config, peerConfig *mgmProto.Pe
 		WgAddr:         peerConfig.Address,
 		IFaceBlackList: config.IFaceBlackList,
 		WgPrivateKey:   key,
-		WgPort:         iface.DefaultWgPort,
+		WgPort:         config.WgPort,
 		SSHKey:         []byte(config.SSHKey),
 	}
 

client/internal/engine.go

@@ -388,17 +388,18 @@ func signalCandidate(candidate ice.Candidate, myKey wgtypes.Key, remoteKey wgtyp
 	return nil
 }
 
-func signalAuth(uFrag string, pwd string, myKey wgtypes.Key, remoteKey wgtypes.Key, s signal.Client, isAnswer bool) error {
+// SignalOfferAnswer signals either an offer or an answer to remote peer
+func SignalOfferAnswer(offerAnswer peer.OfferAnswer, myKey wgtypes.Key, remoteKey wgtypes.Key, s signal.Client, isAnswer bool) error {
 	var t sProto.Body_Type
 	if isAnswer {
 		t = sProto.Body_ANSWER
 	} else {
 		t = sProto.Body_OFFER
 	}
 
-	msg, err := signal.MarshalCredential(myKey, remoteKey, &signal.Credential{
-		UFrag: uFrag,
-		Pwd:   pwd,
+	msg, err := signal.MarshalCredential(myKey, offerAnswer.WgListenPort, remoteKey, &signal.Credential{
+		UFrag: offerAnswer.IceCredentials.UFrag,
+		Pwd:   offerAnswer.IceCredentials.Pwd,
 	}, t)
 	if err != nil {
 		return err
@@ -726,6 +727,7 @@ func (e Engine) createPeerConn(pubKey string, allowedIPs string) (*peer.Conn, er
 		UDPMux:             e.udpMux,
 		UDPMuxSrflx:        e.udpMuxSrflx,
 		ProxyConfig:        proxyConfig,
+		LocalWgPort:        e.config.WgPort,
 	}
 
 	peerConn, err := peer.NewConn(config, e.statusRecorder)
@@ -738,16 +740,16 @@ func (e Engine) createPeerConn(pubKey string, allowedIPs string) (*peer.Conn, er
 		return nil, err
 	}
 
-	signalOffer := func(uFrag string, pwd string) error {
-		return signalAuth(uFrag, pwd, e.config.WgPrivateKey, wgPubKey, e.signal, false)
+	signalOffer := func(offerAnswer peer.OfferAnswer) error {
+		return SignalOfferAnswer(offerAnswer, e.config.WgPrivateKey, wgPubKey, e.signal, false)
 	}
 
 	signalCandidate := func(candidate ice.Candidate) error {
 		return signalCandidate(candidate, e.config.WgPrivateKey, wgPubKey, e.signal)
 	}
 
-	signalAnswer := func(uFrag string, pwd string) error {
-		return signalAuth(uFrag, pwd, e.config.WgPrivateKey, wgPubKey, e.signal, true)
+	signalAnswer := func(offerAnswer peer.OfferAnswer) error {
+		return SignalOfferAnswer(offerAnswer, e.config.WgPrivateKey, wgPubKey, e.signal, true)
 	}
 
 	peerConn.SetSignalCandidate(signalCandidate)
@@ -776,18 +778,26 @@ func (e *Engine) receiveSignalEvents() {
 				if err != nil {
 					return err
 				}
-				conn.OnRemoteOffer(peer.IceCredentials{
-					UFrag: remoteCred.UFrag,
-					Pwd:   remoteCred.Pwd,
+				conn.OnRemoteOffer(peer.OfferAnswer{
+					IceCredentials: peer.IceCredentials{
+						UFrag: remoteCred.UFrag,
+						Pwd:   remoteCred.Pwd,
+					},
+					WgListenPort: int(msg.GetBody().GetWgListenPort()),
+					Version:      msg.GetBody().GetNetBirdVersion(),
 				})
 			case sProto.Body_ANSWER:
 				remoteCred, err := signal.UnMarshalCredential(msg)
 				if err != nil {
 					return err
 				}
-				conn.OnRemoteAnswer(peer.IceCredentials{
-					UFrag: remoteCred.UFrag,
-					Pwd:   remoteCred.Pwd,
+				conn.OnRemoteAnswer(peer.OfferAnswer{
+					IceCredentials: peer.IceCredentials{
+						UFrag: remoteCred.UFrag,
+						Pwd:   remoteCred.Pwd,
+					},
+					WgListenPort: int(msg.GetBody().GetWgListenPort()),
+					Version:      msg.GetBody().GetNetBirdVersion(),
 				})
 			case sProto.Body_CANDIDATE:
 				candidate, err := ice.UnmarshalCandidate(msg.GetBody().Payload)

client/internal/peer/conn.go

@@ -3,6 +3,7 @@ package peer
 import (
 	"context"
 	nbStatus "github.com/netbirdio/netbird/client/status"
+	"github.com/netbirdio/netbird/client/system"
 	"github.com/netbirdio/netbird/iface"
 	"golang.zx2c4.com/wireguard/wgctrl"
 	"net"
@@ -36,6 +37,20 @@ type ConnConfig struct {
 
 	UDPMux      ice.UDPMux
 	UDPMuxSrflx ice.UniversalUDPMux
+
+	LocalWgPort int
+}
+
+// OfferAnswer represents a session establishment offer or answer
+type OfferAnswer struct {
+	IceCredentials IceCredentials
+	// WgListenPort is a remote WireGuard listen port.
+	// This field is used when establishing a direct WireGuard connection without any proxy.
+	// We can set the remote peer's endpoint with this port.
+	WgListenPort int
+
+	// Version of NetBird Agent
+	Version string
 }
 
 // IceCredentials ICE protocol credentials struct
@@ -51,13 +66,13 @@ type Conn struct {
 	// signalCandidate is a handler function to signal remote peer about local connection candidate
 	signalCandidate func(candidate ice.Candidate) error
 	// signalOffer is a handler function to signal remote peer our connection offer (credentials)
-	signalOffer  func(uFrag string, pwd string) error
-	signalAnswer func(uFrag string, pwd string) error
+	signalOffer  func(OfferAnswer) error
+	signalAnswer func(OfferAnswer) error
 
 	// remoteOffersCh is a channel used to wait for remote credentials to proceed with the connection
-	remoteOffersCh chan IceCredentials
+	remoteOffersCh chan OfferAnswer
 	// remoteAnswerCh is a channel used to wait for remote credentials answer (confirmation of our offer) to proceed with the connection
-	remoteAnswerCh     chan IceCredentials
+	remoteAnswerCh     chan OfferAnswer
 	closeCh            chan struct{}
 	ctx                context.Context
 	notifyDisconnected context.CancelFunc
@@ -88,8 +103,8 @@ func NewConn(config ConnConfig, statusRecorder *nbStatus.Status) (*Conn, error)
 		mu:             sync.Mutex{},
 		status:         StatusDisconnected,
 		closeCh:        make(chan struct{}),
-		remoteOffersCh: make(chan IceCredentials),
-		remoteAnswerCh: make(chan IceCredentials),
+		remoteOffersCh: make(chan OfferAnswer),
+		remoteAnswerCh: make(chan OfferAnswer),
 		statusRecorder: statusRecorder,
 	}, nil
 }
@@ -200,23 +215,24 @@ func (conn *Conn) Open() error {
 	// Only continue once we got a connection confirmation from the remote peer.
 	// The connection timeout could have happened before a confirmation received from the remote.
 	// The connection could have also been closed externally (e.g. when we received an update from the management that peer shouldn't be connected)
-	var remoteCredentials IceCredentials
+	var remoteOfferAnswer OfferAnswer
 	select {
-	case remoteCredentials = <-conn.remoteOffersCh:
+	case remoteOfferAnswer = <-conn.remoteOffersCh:
 		// received confirmation from the remote peer -> ready to proceed
 		err = conn.sendAnswer()
 		if err != nil {
 			return err
 		}
-	case remoteCredentials = <-conn.remoteAnswerCh:
+	case remoteOfferAnswer = <-conn.remoteAnswerCh:
 	case <-time.After(conn.config.Timeout):
 		return NewConnectionTimeoutError(conn.config.Key, conn.config.Timeout)
 	case <-conn.closeCh:
 		// closed externally
 		return NewConnectionClosedError(conn.config.Key)
 	}
 
-	log.Debugf("received connection confirmation from peer %s", conn.config.Key)
+	log.Debugf("received connection confirmation from peer %s running version %s and with remote WireGuard listen port %d",
+		conn.config.Key, remoteOfferAnswer.Version, remoteOfferAnswer.WgListenPort)
 
 	// at this point we received offer/answer and we are ready to gather candidates
 	conn.mu.Lock()
@@ -245,16 +261,21 @@ func (conn *Conn) Open() error {
 	isControlling := conn.config.LocalKey > conn.config.Key
 	var remoteConn *ice.Conn
 	if isControlling {
-		remoteConn, err = conn.agent.Dial(conn.ctx, remoteCredentials.UFrag, remoteCredentials.Pwd)
+		remoteConn, err = conn.agent.Dial(conn.ctx, remoteOfferAnswer.IceCredentials.UFrag, remoteOfferAnswer.IceCredentials.Pwd)
 	} else {
-		remoteConn, err = conn.agent.Accept(conn.ctx, remoteCredentials.UFrag, remoteCredentials.Pwd)
+		remoteConn, err = conn.agent.Accept(conn.ctx, remoteOfferAnswer.IceCredentials.UFrag, remoteOfferAnswer.IceCredentials.Pwd)
 	}
 	if err != nil {
 		return err
 	}
 
+	// dynamically set remote WireGuard port is other side specified a different one from the default one
+	remoteWgPort := iface.DefaultWgPort
+	if remoteOfferAnswer.WgListenPort != 0 {
+		remoteWgPort = remoteOfferAnswer.WgListenPort
+	}
 	// the ice connection has been established successfully so we are ready to start the proxy
-	err = conn.startProxy(remoteConn)
+	err = conn.startProxy(remoteConn, remoteWgPort)
 	if err != nil {
 		return err
 	}
@@ -319,7 +340,7 @@ func IsPublicIP(ip net.IP) bool {
 }
 
 // startProxy starts proxying traffic from/to local Wireguard and sets connection status to StatusConnected
-func (conn *Conn) startProxy(remoteConn net.Conn) error {
+func (conn *Conn) startProxy(remoteConn net.Conn, remoteWgPort int) error {
 	conn.mu.Lock()
 	defer conn.mu.Unlock()
 
@@ -336,7 +357,7 @@ func (conn *Conn) startProxy(remoteConn net.Conn) error {
 		p = proxy.NewWireguardProxy(conn.config.ProxyConfig)
 		peerState.Direct = false
 	} else {
-		p = proxy.NewNoProxy(conn.config.ProxyConfig)
+		p = proxy.NewNoProxy(conn.config.ProxyConfig, remoteWgPort)
 		peerState.Direct = true
 	}
 	conn.proxy = p
@@ -409,12 +430,12 @@ func (conn *Conn) cleanup() error {
 }
 
 // SetSignalOffer sets a handler function to be triggered by Conn when a new connection offer has to be signalled to the remote peer
-func (conn *Conn) SetSignalOffer(handler func(uFrag string, pwd string) error) {
+func (conn *Conn) SetSignalOffer(handler func(offer OfferAnswer) error) {
 	conn.signalOffer = handler
 }
 
 // SetSignalAnswer sets a handler function to be triggered by Conn when a new connection answer has to be signalled to the remote peer
-func (conn *Conn) SetSignalAnswer(handler func(uFrag string, pwd string) error) {
+func (conn *Conn) SetSignalAnswer(handler func(answer OfferAnswer) error) {
 	conn.signalAnswer = handler
 }
 
@@ -459,8 +480,12 @@ func (conn *Conn) sendAnswer() error {
 		return err
 	}
 
-	log.Debugf("sending asnwer to %s", conn.config.Key)
-	err = conn.signalAnswer(localUFrag, localPwd)
+	log.Debugf("sending answer to %s", conn.config.Key)
+	err = conn.signalAnswer(OfferAnswer{
+		IceCredentials: IceCredentials{localUFrag, localPwd},
+		WgListenPort:   conn.config.LocalWgPort,
+		Version:        system.NetbirdVersion(),
+	})
 	if err != nil {
 		return err
 	}
@@ -477,7 +502,11 @@ func (conn *Conn) sendOffer() error {
 	if err != nil {
 		return err
 	}
-	err = conn.signalOffer(localUFrag, localPwd)
+	err = conn.signalOffer(OfferAnswer{
+		IceCredentials: IceCredentials{localUFrag, localPwd},
+		WgListenPort:   conn.config.LocalWgPort,
+		Version:        system.NetbirdVersion(),
+	})
 	if err != nil {
 		return err
 	}
@@ -518,11 +547,11 @@ func (conn *Conn) Status() ConnStatus {
 
 // OnRemoteOffer handles an offer from the remote peer and returns true if the message was accepted, false otherwise
 // doesn't block, discards the message if connection wasn't ready
-func (conn *Conn) OnRemoteOffer(remoteAuth IceCredentials) bool {
+func (conn *Conn) OnRemoteOffer(offer OfferAnswer) bool {
 	log.Debugf("OnRemoteOffer from peer %s on status %s", conn.config.Key, conn.status.String())
 
 	select {
-	case conn.remoteOffersCh <- remoteAuth:
+	case conn.remoteOffersCh <- offer:
 		return true
 	default:
 		log.Debugf("OnRemoteOffer skipping message from peer %s on status %s because is not ready", conn.config.Key, conn.status.String())
@@ -533,11 +562,11 @@ func (conn *Conn) OnRemoteOffer(remoteAuth IceCredentials) bool {
 
 // OnRemoteAnswer handles an offer from the remote peer and returns true if the message was accepted, false otherwise
 // doesn't block, discards the message if connection wasn't ready
-func (conn *Conn) OnRemoteAnswer(remoteAuth IceCredentials) bool {
+func (conn *Conn) OnRemoteAnswer(answer OfferAnswer) bool {
 	log.Debugf("OnRemoteAnswer from peer %s on status %s", conn.config.Key, conn.status.String())
 
 	select {
-	case conn.remoteAnswerCh <- remoteAuth:
+	case conn.remoteAnswerCh <- answer:
 		return true
 	default:
 		// connection might not be ready yet to receive so we ignore the message

client/internal/peer/conn_test.go

@@ -18,6 +18,7 @@ var connConf = ConnConfig{
 	InterfaceBlackList: nil,
 	Timeout:            time.Second,
 	ProxyConfig:        proxy.Config{},
+	LocalWgPort:        51820,
 }
 
 func TestNewConn_interfaceFilter(t *testing.T) {
@@ -59,9 +60,13 @@ func TestConn_OnRemoteOffer(t *testing.T) {
 
 	go func() {
 		for {
-			accepted := conn.OnRemoteOffer(IceCredentials{
-				UFrag: "test",
-				Pwd:   "test",
+			accepted := conn.OnRemoteOffer(OfferAnswer{
+				IceCredentials: IceCredentials{
+					UFrag: "test",
+					Pwd:   "test",
+				},
+				WgListenPort: 0,
+				Version:      "",
 			})
 			if accepted {
 				wg.Done()
@@ -89,9 +94,13 @@ func TestConn_OnRemoteAnswer(t *testing.T) {
 
 	go func() {
 		for {
-			accepted := conn.OnRemoteAnswer(IceCredentials{
-				UFrag: "test",
-				Pwd:   "test",
+			accepted := conn.OnRemoteAnswer(OfferAnswer{
+				IceCredentials: IceCredentials{
+					UFrag: "test",
+					Pwd:   "test",
+				},
+				WgListenPort: 0,
+				Version:      "",
 			})
 			if accepted {
 				wg.Done()