Decoy registration sharing bug fix (#245)

fix c2s used when sharing decoy registrations over the api and track debug tools on master

.gitignore

@@ -9,3 +9,4 @@ cmd/registration-server/regserver
 target
 bin/
 Cargo.lock
+__pycache__/

pkg/station/lib/registration.go

@@ -278,6 +278,8 @@ func (regManager *RegistrationManager) Cleanup() {
 
 // DecoyRegistration is a struct for tracking individual sessions that are expecting or tracking connections.
 type DecoyRegistration struct {
+	originalC2S *pb.ClientToStation
+
 	PhantomIp    net.IP
 	PhantomPort  uint16
 	PhantomProto pb.IPProto
@@ -409,44 +411,28 @@ func (reg *DecoyRegistration) IDString() string {
 	return string(secret[:regIDLen])
 }
 
-// GenerateClientToStation creates a clientToStation struct. This is used in registration sharing
-// between stations where the station notifies other stations of a registration.
-func (reg *DecoyRegistration) GenerateClientToStation() *pb.ClientToStation {
-	v4 := false
-	if reg.PhantomIp.To4() != nil {
-		v4 = true
-	}
-	v6 := !v4
+// GenerateC2SWrapper creates a C2SWrapper struct. This is used in registration sharing between
+// stations where the station notifies other stations of a registration.
+func (reg *DecoyRegistration) GenerateC2SWrapper() *pb.C2SWrapper {
 
-	//[reference] Generate ClientToStation protobuf
-	// transition := pb.C2S_Transition_C2S_SESSION_INIT
-	initProto := &pb.ClientToStation{
-		CovertAddress:       &reg.Covert,
-		DecoyListGeneration: &reg.DecoyListVersion,
-		V6Support:           &v6,
-		V4Support:           &v4,
-		Transport:           &reg.Transport,
+	if reg.originalC2S == nil {
+		return nil
 	}
 
-	for (proto.Size(initProto)+AES_GCM_TAG_SIZE)%3 != 0 {
-		initProto.Padding = append(initProto.Padding, byte(0))
+	// This prevents double sharing of the registration over the API when the original C2S creates
+	// two registrations, one for IPv4 and one for IPv6.
+	if reg.PhantomIp.To4() == nil && reg.originalC2S.GetV4Support() {
+		return nil
 	}
 
-	return initProto
-}
-
-// GenerateC2SWrapper creates a C2SWrapper struct. This is used in registration sharing between
-// stations where the station notifies other stations of a registration.
-func (reg *DecoyRegistration) GenerateC2SWrapper() *pb.C2SWrapper {
-	boolHolder := true
-	c2s := reg.GenerateClientToStation()
+	c2s := proto.Clone(reg.originalC2S).(*pb.ClientToStation)
 
 	if c2s.GetFlags() == nil {
 		c2s.Flags = &pb.RegistrationFlags{
-			Prescanned: &boolHolder,
+			Prescanned: proto.Bool(true),
 		}
 	} else {
-		c2s.Flags.Prescanned = &boolHolder
+		c2s.Flags.Prescanned = proto.Bool(true)
 	}
 
 	source := pb.RegistrationSource_DetectorPrescan

pkg/station/lib/registration_ingest.go

@@ -164,7 +164,6 @@ func (rm *RegistrationManager) ingestRegistration(reg *DecoyRegistration) {
 		logger.Errorln("error tracking registration: ", err)
 		Stat().AddErrReg()
 		rm.AddErrReg()
-
 	}
 
 	// If registration is trying to connect to a covert address that
@@ -238,6 +237,9 @@ func (rm *RegistrationManager) ingestRegistration(reg *DecoyRegistration) {
 
 func tryShareRegistrationOverAPI(reg *DecoyRegistration, apiEndpoint string, logger *log.Logger) {
 	c2a := reg.GenerateC2SWrapper()
+	if c2a == nil {
+		return
+	}
 
 	payload, err := proto.Marshal(c2a)
 	if err != nil {
@@ -294,10 +296,11 @@ func (rm *RegistrationManager) parseRegMessage(msg []byte) ([]*DecoyRegistration
 		parsed.DecoyAddress = make([]byte, 16)
 	}
 
-	// If client IP logging is disabled DO NOT parse source IP.
-	var sourceAddr, phantomAddr net.IP
+	// If client IP logging is disabled DO NOT parse source IP. The decoy address is only used when
+	// he client registered using the decoy registrar - indicating the IP of the decoy site used.
+	var sourceAddr, decoyAddress net.IP
 	sourceAddr = net.IP(parsed.GetRegistrationAddress())
-	phantomAddr = net.IP(parsed.GetDecoyAddress())
+	decoyAddress = net.IP(parsed.GetDecoyAddress())
 
 	// Register one or both of v4 and v6 based on support specified by the client
 	var newRegs []*DecoyRegistration
@@ -329,7 +332,7 @@ func (rm *RegistrationManager) parseRegMessage(msg []byte) ([]*DecoyRegistration
 
 	// log decoy connection and id string if debug logging is enabled.
 	if len(newRegs) > 0 {
-		logger.Debugf("received registration: '%v' -> '%v' %v %s\n", sourceAddr, phantomAddr, newRegs[0].IDString(), parsed.GetRegistrationSource())
+		logger.Debugf("received registration: '%v' -> '%v' %v %s\n", sourceAddr, decoyAddress, newRegs[0].IDString(), parsed.GetRegistrationSource())
 	}
 	return newRegs, nil
 }
@@ -372,6 +375,8 @@ func (rm *RegistrationManager) NewRegistration(c2s *pb.ClientToStation, conjureK
 	}
 
 	reg := DecoyRegistration{
+		originalC2S: proto.Clone(c2s).(*pb.ClientToStation),
+
 		DecoyListVersion: c2s.GetDecoyListGeneration(),
 		Keys:             conjureKeys,
 		Covert:           c2s.GetCovertAddress(),

proto/Makefile

@@ -6,6 +6,7 @@ SRC		= signalling.proto
 
 GO_OUT		= signalling.pb.go
 RUST_OUT	= signalling.rs
+PYTHON_OUT	= signalling_pb2.py
 RUST_OUT_PATH	= ../src/$(RUST_OUT)
 
 default: $(RUST_OUT_PATH) $(GO_OUT)
@@ -16,8 +17,8 @@ $(GO_OUT):	$(SRC)
 $(RUST_OUT_PATH): $(SRC)
 	$(PROTOC) $(SRC) --rust_out . && cp $(RUST_OUT) $(RUST_OUT_PATH)
 
-$(PYTHON_OUT_PATH): $(SRC)
-	$(PROTOC) --python_out=. $(SRC) && cp $(PYTHON_OUT) $(PYTHON_OUT_PATH)
+$(PYTHON_OUT): $(SRC)
+	$(PROTOC) -I . --python_out=. $(SRC)
 
 clean:
-	rm -f $(GO_OUT) $(RUST_OUT) $(RUST_OUT_PATH) $(PYTHON_OUT) $(PYTHON_OUT_PATH)
+	rm -f $(GO_OUT) $(RUST_OUT) $(RUST_OUT_PATH) $(PYTHON_OUT)

util/station-debug/README

@@ -0,0 +1,9 @@
+Script to subscribe to the redis Station-to-Detector channel for registered phantoms
+
+sudo apt install python3 pip
+pip3 install redis
+pip3 install protobuf
+
+
+./run.sh
+

util/station-debug/go.mod

@@ -0,0 +1,40 @@
+module zmqsub
+
+go 1.20
+
+require (
+	github.com/pebbe/zmq4 v1.2.10
+	github.com/refraction-networking/conjure v0.7.6
+	google.golang.org/protobuf v1.31.0
+)
+
+require (
+	github.com/BurntSushi/toml v1.3.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dchest/siphash v1.2.3 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/go-redis/redis/v8 v8.11.5 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/gopacket v1.1.19 // indirect
+	github.com/hashicorp/golang-lru v1.0.2 // indirect
+	github.com/libp2p/go-reuseport v0.4.0 // indirect
+	github.com/mroth/weightedrand v1.0.0 // indirect
+	github.com/oschwald/geoip2-golang v1.9.0 // indirect
+	github.com/oschwald/maxminddb-golang v1.12.0 // indirect
+	github.com/pelletier/go-toml v1.9.5 // indirect
+	github.com/pion/dtls/v2 v2.2.7 // indirect
+	github.com/pion/logging v0.2.2 // indirect
+	github.com/pion/randutil v0.1.0 // indirect
+	github.com/pion/sctp v1.8.8 // indirect
+	github.com/pion/stun v0.6.1 // indirect
+	github.com/pion/transport/v2 v2.2.3 // indirect
+	github.com/refraction-networking/ed25519 v0.1.2 // indirect
+	github.com/refraction-networking/obfs4 v0.1.2 // indirect
+	gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/goptlib v1.5.0 // indirect
+	golang.org/x/crypto v0.13.0 // indirect
+	golang.org/x/sys v0.12.0 // indirect
+)
+
+replace github.com/pion/dtls/v2 => github.com/mingyech/dtls/v2 v2.0.0
+
+replace github.com/pion/transport/v2 => github.com/mingyech/transport/v2 v2.0.0

util/station-debug/go.sum

@@ -0,0 +1,135 @@
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