Enhance ICE handshake with session ID management and improve message handling

client/internal/engine.go

@@ -1336,19 +1336,21 @@ func (e *Engine) receiveSignalEvents() {
 			}
 
 			switch msg.GetBody().Type {
-			case sProto.Body_OFFER:
+			case sProto.Body_OFFER, sProto.Body_ANSWER:
 				remoteCred, err := signal.UnMarshalCredential(msg)
 				if err != nil {
 					return err
 				}
 
-				var rosenpassPubKey []byte
+				var (
-				rosenpassAddr := ""
+					rosenpassPubKey []byte
-				if msg.GetBody().GetRosenpassConfig() != nil {
+					rosenpassAddr   string
-					rosenpassPubKey = msg.GetBody().GetRosenpassConfig().GetRosenpassPubKey()
+				)
-					rosenpassAddr = msg.GetBody().GetRosenpassConfig().GetRosenpassServerAddr()
+				if cfg := msg.GetBody().GetRosenpassConfig(); cfg != nil {
+					rosenpassPubKey = cfg.GetRosenpassPubKey()
+					rosenpassAddr = cfg.GetRosenpassServerAddr()
 				}
-				conn.OnRemoteOffer(peer.OfferAnswer{
+				offerAnswer := peer.OfferAnswer{
 					IceCredentials: peer.IceCredentials{
 						UFrag: remoteCred.UFrag,
 						Pwd:   remoteCred.Pwd,
@@ -1358,30 +1360,14 @@ func (e *Engine) receiveSignalEvents() {
 					RosenpassPubKey: rosenpassPubKey,
 					RosenpassAddr:   rosenpassAddr,
 					RelaySrvAddress: msg.GetBody().GetRelayServerAddress(),
-				})
+					SessionID:       msg.GetBody().SessionId,
-			case sProto.Body_ANSWER:
-				remoteCred, err := signal.UnMarshalCredential(msg)
-				if err != nil {
-					return err
 				}
 
-				var rosenpassPubKey []byte
+				if msg.Body.Type == sProto.Body_OFFER {
-				rosenpassAddr := ""
+					conn.OnRemoteOffer(offerAnswer)
-				if msg.GetBody().GetRosenpassConfig() != nil {
+				} else {
-					rosenpassPubKey = msg.GetBody().GetRosenpassConfig().GetRosenpassPubKey()
+					conn.OnRemoteAnswer(offerAnswer)
-					rosenpassAddr = msg.GetBody().GetRosenpassConfig().GetRosenpassServerAddr()
 				}
-				conn.OnRemoteAnswer(peer.OfferAnswer{
-					IceCredentials: peer.IceCredentials{
-						UFrag: remoteCred.UFrag,
-						Pwd:   remoteCred.Pwd,
-					},
-					WgListenPort:    int(msg.GetBody().GetWgListenPort()),
-					Version:         msg.GetBody().GetNetBirdVersion(),
-					RosenpassPubKey: rosenpassPubKey,
-					RosenpassAddr:   rosenpassAddr,
-					RelaySrvAddress: msg.GetBody().GetRelayServerAddress(),
-				})
 			case sProto.Body_CANDIDATE:
 				candidate, err := ice.UnmarshalCandidate(msg.GetBody().Payload)
 				if err != nil {

client/internal/peer/conn.go

@@ -548,7 +548,6 @@ func (conn *Conn) onRelayDisconnected() {
 }
 
 func (conn *Conn) onGuardEvent() {
-	conn.Log.Debugf("send offer to peer")
 	conn.dumpState.SendOffer()
 	if err := conn.handshaker.SendOffer(); err != nil {
 		conn.Log.Errorf("failed to send offer: %v", err)

client/internal/peer/handshaker.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"sync"
+	"time"
 
 	log "github.com/sirupsen/logrus"
 
@@ -39,6 +40,11 @@ type OfferAnswer struct {
 
 	// relay server address
 	RelaySrvAddress string
+	// SessionID is the unique identifier of the session, used to discard old messages
+	SessionID *int64
+
+	// for debugging purposes
+	When time.Time
 }
 
 type Handshaker struct {
@@ -133,42 +139,35 @@ func (h *Handshaker) sendOffer() error {
 		return ErrSignalIsNotReady
 	}
 
-	iceUFrag, icePwd := h.ice.GetLocalUserCredentials()
+	offer := h.buildOfferAnswer()
-	offer := OfferAnswer{
+	h.log.Infof("sending offer: %s, %d", offer.When, offer.SessionID)
-		IceCredentials:  IceCredentials{iceUFrag, icePwd},
-		WgListenPort:    h.config.LocalWgPort,
-		Version:         version.NetbirdVersion(),
-		RosenpassPubKey: h.config.RosenpassConfig.PubKey,
-		RosenpassAddr:   h.config.RosenpassConfig.Addr,
-	}
-
-	addr, err := h.relay.RelayInstanceAddress()
-	if err == nil {
-		offer.RelaySrvAddress = addr
-	}
 
 	return h.signaler.SignalOffer(offer, h.config.Key)
 }
 
 func (h *Handshaker) sendAnswer() error {
-	h.log.Infof("sending answer")
+	answer := h.buildOfferAnswer()
-	uFrag, pwd := h.ice.GetLocalUserCredentials()
+	h.log.Infof("sending answer: %s, serial: %d", answer.When, answer.SessionID)
 
+	return h.signaler.SignalAnswer(answer, h.config.Key)
+}
+
+func (h *Handshaker) buildOfferAnswer() OfferAnswer {
+	uFrag, pwd := h.ice.GetLocalUserCredentials()
+	sid := h.ice.SessionID()
 	answer := OfferAnswer{
 		IceCredentials:  IceCredentials{uFrag, pwd},
 		WgListenPort:    h.config.LocalWgPort,
 		Version:         version.NetbirdVersion(),
 		RosenpassPubKey: h.config.RosenpassConfig.PubKey,
 		RosenpassAddr:   h.config.RosenpassConfig.Addr,
+		When:            time.Now(),
+		SessionID:       &sid,
 	}
-	addr, err := h.relay.RelayInstanceAddress()
+
-	if err == nil {
+	if addr, err := h.relay.RelayInstanceAddress(); err == nil {
 		answer.RelaySrvAddress = addr
 	}
 
-	if err = h.signaler.SignalAnswer(answer, h.config.Key); err != nil {
+	return answer
-		return err
-	}
-
-	return nil
 }

client/internal/peer/signaler.go

@@ -56,7 +56,8 @@ func (s *Signaler) signalOfferAnswer(offerAnswer OfferAnswer, remoteKey string,
 		bodyType,
 		offerAnswer.RosenpassPubKey,
 		offerAnswer.RosenpassAddr,
-		offerAnswer.RelaySrvAddress)
+		offerAnswer.RelaySrvAddress,
+		*offerAnswer.SessionID)
 	if err != nil {
 		return err
 	}

client/internal/peer/worker_ice.go

@@ -46,7 +46,14 @@ type WorkerICE struct {
 	agentDialerCancel context.CancelFunc
 	agentConnecting   bool      // while it is true, drop all incoming offers
 	lastSuccess       time.Time // with this avoid the too frequent ICE agent recreation
-	muxAgent          sync.Mutex
+	// remoteSessionID represents the peer's session identifier from the latest remote offer.
+	remoteSessionID int64
+	// sessionID is used to track the current session ID of the ICE agent
+	// increase by one when disconnecting the agent
+	// with it the remote peer can discard the already deprecated offer/answer
+	// Without it the remote peer may recreate a workable ICE connection
+	sessionID int64
+	muxAgent  sync.Mutex
 
 	StunTurn []*stun.URI
 
@@ -70,6 +77,7 @@ func NewWorkerICE(ctx context.Context, log *log.Entry, config ConnConfig, conn *
 		statusRecorder:    statusRecorder,
 		hasRelayOnLocally: hasRelayOnLocally,
 		lastKnownState:    ice.ConnectionStateDisconnected,
+		sessionID:         0,
 	}
 
 	localUfrag, localPwd, err := icemaker.GenerateICECredentials()
@@ -82,7 +90,7 @@ func NewWorkerICE(ctx context.Context, log *log.Entry, config ConnConfig, conn *
 }
 
 func (w *WorkerICE) OnNewOffer(remoteOfferAnswer *OfferAnswer) {
-	w.log.Debugf("OnNewOffer for ICE")
+	w.log.Debugf("OnNewOffer for ICE: %s, %s, serial: %d", time.Since(remoteOfferAnswer.When), remoteOfferAnswer.When, remoteOfferAnswer.SessionID)
 	w.muxAgent.Lock()
 
 	if w.agentConnecting {
@@ -92,8 +100,13 @@ func (w *WorkerICE) OnNewOffer(remoteOfferAnswer *OfferAnswer) {
 	}
 
 	if w.agent != nil {
-		if time.Since(w.lastSuccess) < 900*time.Millisecond {
+		// backward compatibility with old clients that do not send session ID
-			w.log.Debugf("agent is already connected, skipping the offer")
+		if remoteOfferAnswer.SessionID == nil {
+			w.log.Debugf("agent already exists, skipping the offer")
+			w.muxAgent.Unlock()
+			return
+		}
+		if w.remoteSessionID == *remoteOfferAnswer.SessionID {
 			w.muxAgent.Unlock()
 			return
 		}
@@ -194,6 +207,13 @@ func (w *WorkerICE) reCreateAgent(dialerCancel context.CancelFunc, candidates []
 	return agent, nil
 }
 
+func (w *WorkerICE) SessionID() int64 {
+	w.muxAgent.Lock()
+	defer w.muxAgent.Unlock()
+
+	return w.sessionID
+}
+
 // will block until connection succeeded
 // but it won't release if ICE Agent went into Disconnected or Failed state,
 // so we have to cancel it with the provided context once agent detected a broken connection
@@ -241,9 +261,13 @@ func (w *WorkerICE) connect(ctx context.Context, agent *ice.Agent, remoteOfferAn
 	}
 	w.log.Debugf("on ICE conn is ready to use")
 
+	w.log.Infof("connection successed with offer session: %d", remoteOfferAnswer.SessionID)
 	w.muxAgent.Lock()
 	w.agentConnecting = false
 	w.lastSuccess = time.Now()
+	if remoteOfferAnswer.SessionID != nil {
+		w.remoteSessionID = *remoteOfferAnswer.SessionID
+	}
 	w.muxAgent.Unlock()
 
 	// todo: the potential problem is a race between the onConnectionStateChange
@@ -257,6 +281,7 @@ func (w *WorkerICE) closeAgent(agent *ice.Agent, cancel context.CancelFunc) {
 	}
 
 	w.muxAgent.Lock()
+	w.sessionID++
 	if w.agent == agent {
 		w.agent = nil
 		w.agentConnecting = false

signal/client/client.go

@@ -52,7 +52,7 @@ func UnMarshalCredential(msg *proto.Message) (*Credential, error) {
 }
 
 // MarshalCredential marshal a Credential instance and returns a Message object
-func MarshalCredential(myKey wgtypes.Key, myPort int, remoteKey string, credential *Credential, t proto.Body_Type, rosenpassPubKey []byte, rosenpassAddr string, relaySrvAddress string) (*proto.Message, error) {
+func MarshalCredential(myKey wgtypes.Key, myPort int, remoteKey string, credential *Credential, t proto.Body_Type, rosenpassPubKey []byte, rosenpassAddr string, relaySrvAddress string, sessionID int64) (*proto.Message, error) {
 	return &proto.Message{
 		Key:       myKey.PublicKey().String(),
 		RemoteKey: remoteKey,
@@ -66,6 +66,7 @@ func MarshalCredential(myKey wgtypes.Key, myPort int, remoteKey string, credenti
 				RosenpassServerAddr: rosenpassAddr,
 			},
 			RelayServerAddress: relaySrvAddress,
+			SessionId:          &sessionID,
 		},
 	}, nil
 }

signal/client/grpc.go

@@ -45,19 +45,10 @@ type GrpcClient struct {
 	connStateCallbackLock sync.RWMutex
 
 	onReconnectedListenerFn func()
-}
 
-func (c *GrpcClient) StreamConnected() bool {
+	decryptionWorker       *Worker
-	return c.status == StreamConnected
+	decryptionWorkerCancel context.CancelFunc
-}
+	decryptionWg           sync.WaitGroup
-
-func (c *GrpcClient) GetStatus() Status {
-	return c.status
-}
-
-// Close Closes underlying connections to the Signal Exchange
-func (c *GrpcClient) Close() error {
-	return c.signalConn.Close()
 }
 
 // NewClient creates a new Signal client
@@ -93,6 +84,25 @@ func NewClient(ctx context.Context, addr string, key wgtypes.Key, tlsEnabled boo
 	}, nil
 }
 
+func (c *GrpcClient) StreamConnected() bool {
+	return c.status == StreamConnected
+}
+
+func (c *GrpcClient) GetStatus() Status {
+	return c.status
+}
+
+// Close Closes underlying connections to the Signal Exchange
+func (c *GrpcClient) Close() error {
+	if c.decryptionWorkerCancel != nil {
+		c.decryptionWorkerCancel()
+	}
+	c.decryptionWg.Wait()
+	c.decryptionWorker = nil
+
+	return c.signalConn.Close()
+}
+
 // SetConnStateListener set the ConnStateNotifier
 func (c *GrpcClient) SetConnStateListener(notifier ConnStateNotifier) {
 	c.connStateCallbackLock.Lock()
@@ -148,8 +158,12 @@ func (c *GrpcClient) Receive(ctx context.Context, msgHandler func(msg *proto.Mes
 
 		log.Infof("connected to the Signal Service stream")
 		c.notifyConnected()
+
+		// Start worker pool if not already started
+		c.startEncryptionWorker(ctx, msgHandler)
+
 		// start receiving messages from the Signal stream (from other peers through signal)
-		err = c.receive(stream, msgHandler)
+		err = c.receive(stream)
 		if err != nil {
 			if s, ok := status.FromError(err); ok && s.Code() == codes.Canceled {
 				log.Debugf("signal connection context has been canceled, this usually indicates shutdown")
@@ -174,6 +188,7 @@ func (c *GrpcClient) Receive(ctx context.Context, msgHandler func(msg *proto.Mes
 
 	return nil
 }
+
 func (c *GrpcClient) notifyStreamDisconnected() {
 	c.mux.Lock()
 	defer c.mux.Unlock()
@@ -382,11 +397,11 @@ func (c *GrpcClient) Send(msg *proto.Message) error {
 }
 
 // receive receives messages from other peers coming through the Signal Exchange
-func (c *GrpcClient) receive(stream proto.SignalExchange_ConnectStreamClient,
+// and distributes them to worker threads for processing
-	msgHandler func(msg *proto.Message) error) error {
+func (c *GrpcClient) receive(stream proto.SignalExchange_ConnectStreamClient) error {
-
 	for {
 		msg, err := stream.Recv()
+		// Handle errors immediately
 		switch s, ok := status.FromError(err); {
 		case ok && s.Code() == codes.Canceled:
 			log.Debugf("stream canceled (usually indicates shutdown)")
@@ -398,24 +413,36 @@ func (c *GrpcClient) receive(stream proto.SignalExchange_ConnectStreamClient,
 			log.Debugf("Signal Service stream closed by server")
 			return err
 		case err != nil:
+			log.Errorf("Stream receive error: %v", err)
 			return err
 		}
-		log.Tracef("received a new message from Peer [fingerprint: %s]", msg.Key)
 
-		decryptedMessage, err := c.decryptMessage(msg)
+		if msg == nil {
-		if err != nil {
+			continue
-			log.Errorf("failed decrypting message of Peer [key: %s] error: [%s]", msg.Key, err.Error())
 		}
 
-		err = msgHandler(decryptedMessage)
+		if err := c.decryptionWorker.AddMsg(msg); err != nil {
-
+			log.Errorf("failed to add message to decryption worker: %v", err)
-		if err != nil {
-			log.Errorf("error while handling message of Peer [key: %s] error: [%s]", msg.Key, err.Error())
-			// todo send something??
 		}
 	}
 }
 
+func (c *GrpcClient) startEncryptionWorker(ctx context.Context, handler func(msg *proto.Message) error) {
+	if c.decryptionWorker != nil {
+		return
+	}
+
+	c.decryptionWorker = NewWorker(c.decryptMessage, handler)
+	c.decryptionWg.Add(1)
+	go func() {
+		workerCtx, workerCancel := context.WithCancel(ctx)
+		defer workerCancel()
+
+		c.decryptionWorker.Work(workerCtx)
+		c.decryptionWg.Done()
+	}()
+}
+
 func (c *GrpcClient) notifyDisconnected(err error) {
 	c.connStateCallbackLock.RLock()
 	defer c.connStateCallbackLock.RUnlock()

signal/client/worker.go

@@ -0,0 +1,57 @@
+package client
+
+import (
+	"context"
+	"fmt"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/signal/proto"
+)
+
+type Worker struct {
+	decryptMessage func(msg *proto.EncryptedMessage) (*proto.Message, error)
+	handler        func(msg *proto.Message) error
+
+	encryptedMsgPool chan *proto.EncryptedMessage
+}
+
+func NewWorker(decryptFn func(msg *proto.EncryptedMessage) (*proto.Message, error), handlerFn func(msg *proto.Message) error) *Worker {
+	return &Worker{
+		decryptMessage:   decryptFn,
+		handler:          handlerFn,
+		encryptedMsgPool: make(chan *proto.EncryptedMessage, 1),
+	}
+}
+
+func (w *Worker) AddMsg(msg *proto.EncryptedMessage) error {
+	if w.encryptedMsgPool == nil {
+		return fmt.Errorf("worker is not initialized")
+	}
+
+	// this is blocker because do not want to drop messages here
+	w.encryptedMsgPool <- msg
+	return nil
+}
+
+func (w *Worker) Work(ctx context.Context) {
+	for {
+		select {
+		case msg := <-w.encryptedMsgPool:
+			decryptedMessage, err := w.decryptMessage(msg)
+			if err != nil {
+				log.Errorf("failed to decrypt message: %v", err)
+				continue
+			}
+
+			if err := w.handler(decryptedMessage); err != nil {
+				log.Errorf("failed to handle message: %v", err)
+				continue
+			}
+
+		case <-ctx.Done():
+			log.Debugf("Message worker stopping due to context cancellation")
+			return
+		}
+	}
+}

signal/proto/signalexchange.pb.go

@@ -230,6 +230,7 @@ type Body struct {
 	RosenpassConfig *RosenpassConfig `protobuf:"bytes,7,opt,name=rosenpassConfig,proto3" json:"rosenpassConfig,omitempty"`
 	// relayServerAddress is url of the relay server
 	RelayServerAddress string `protobuf:"bytes,8,opt,name=relayServerAddress,proto3" json:"relayServerAddress,omitempty"`
+	SessionId          *int64 `protobuf:"varint,9,opt,name=sessionId,proto3,oneof" json:"sessionId,omitempty"`
 }
 
 func (x *Body) Reset() {
@@ -320,6 +321,13 @@ func (x *Body) GetRelayServerAddress() string {
 	return ""
 }
 
+func (x *Body) GetSessionId() int64 {
+	if x != nil && x.SessionId != nil {
+		return *x.SessionId
+	}
+	return 0
+}
+
 // Mode indicates a connection mode
 type Mode struct {
 	state         protoimpl.MessageState
@@ -443,7 +451,7 @@ var file_signalexchange_proto_rawDesc = []byte{
 	0x52, 0x09, 0x72, 0x65, 0x6d, 0x6f, 0x74, 0x65, 0x4b, 0x65, 0x79, 0x12, 0x28, 0x0a, 0x04, 0x62,
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 	0x61, 0x6c, 0x65, 0x78, 0x63, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x2e, 0x42, 0x6f, 0x64, 0x79, 0x52,
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+	0x04, 0x62, 0x6f, 0x64, 0x79, 0x22, 0xe4, 0x03, 0x0a, 0x04, 0x42, 0x6f, 0x64, 0x79, 0x12, 0x2d,
 	0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x19, 0x2e, 0x73,
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@@ -466,34 +474,37 @@ var file_signalexchange_proto_rawDesc = []byte{
 	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x2e, 0x0a, 0x12, 0x72, 0x65, 0x6c, 0x61, 0x79, 0x53,
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 }
 
 var (
@@ -601,6 +612,7 @@ func file_signalexchange_proto_init() {
 			}
 		}
 	}
+	file_signalexchange_proto_msgTypes[2].OneofWrappers = []interface{}{}
 	file_signalexchange_proto_msgTypes[3].OneofWrappers = []interface{}{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{

signal/proto/signalexchange.proto

@@ -64,6 +64,8 @@ message Body {
 
   // relayServerAddress is url of the relay server
   string relayServerAddress = 8;
+
+  optional int64 sessionId = 9;
 }
 
 // Mode indicates a connection mode