UDP noise (#3711)

* added udp noise

* adding protobuf settings

* freedom json parser and clean up

* resolve confict

* fix and clean up

* use net.conn instead of packetconnwrapper

* avoid constructing SequentialWriter directly

---------

Co-authored-by: mmmray <142015632+mmmray@users.noreply.github.com>

infra/conf/freedom.go

@@ -18,6 +18,7 @@ type FreedomConfig struct {
 	Redirect       string    `json:"redirect"`
 	UserLevel      uint32    `json:"userLevel"`
 	Fragment       *Fragment `json:"fragment"`
+	Noise          *Noise    `json:"noise"`
 	ProxyProtocol  uint32    `json:"proxyProtocol"`
 }
 
@@ -27,6 +28,11 @@ type Fragment struct {
 	Interval string `json:"interval"`
 }
 
+type Noise struct {
+	Packet string `json:"packet"`
+	Delay  string `json:"delay"`
+}
+
 // Build implements Buildable
 func (c *FreedomConfig) Build() (proto.Message, error) {
 	config := new(freedom.Config)
@@ -143,6 +149,76 @@ func (c *FreedomConfig) Build() (proto.Message, error) {
 			}
 		}
 	}
+	if c.Noise != nil {
+		config.Noise = new(freedom.Noise)
+		var err, err2 error
+		p := strings.Split(strings.ToLower(c.Noise.Packet), ":")
+		if len(p) != 2 {
+			return nil, errors.New("invalid type for packet")
+		}
+		switch p[0] {
+		case "rand":
+			randValue := strings.Split(p[1], "-")
+			if len(randValue) > 2 {
+				return nil, errors.New("Only 2 values are allowed for rand")
+			}
+			if len(randValue) == 2 {
+				config.Noise.LengthMin, err = strconv.ParseUint(randValue[0], 10, 64)
+				config.Noise.LengthMax, err2 = strconv.ParseUint(randValue[1], 10, 64)
+			}
+			if len(randValue) == 1 {
+				config.Noise.LengthMin, err = strconv.ParseUint(randValue[0], 10, 64)
+				config.Noise.LengthMax = config.Noise.LengthMin
+			}
+			if err != nil {
+				return nil, errors.New("invalid value for rand LengthMin").Base(err)
+			}
+			if err2 != nil {
+				return nil, errors.New("invalid value for rand LengthMax").Base(err2)
+			}
+			if config.Noise.LengthMin > config.Noise.LengthMax {
+				config.Noise.LengthMin, config.Noise.LengthMax = config.Noise.LengthMax, config.Noise.LengthMin
+			}
+			if config.Noise.LengthMin == 0 {
+				return nil, errors.New("rand lengthMin or lengthMax cannot be 0")
+			}
+
+		case "str":
+			//user input string
+			config.Noise.StrNoise = strings.TrimSpace(p[1])
+
+		default:
+			return nil, errors.New("Invalid packet,only rand and str are supported")
+		}
+		if c.Noise.Delay != "" {
+			d := strings.Split(strings.ToLower(c.Noise.Delay), "-")
+			if len(d) > 2 {
+				return nil, errors.New("Invalid delay value")
+			}
+			if len(d) == 2 {
+				config.Noise.DelayMin, err = strconv.ParseUint(d[0], 10, 64)
+				config.Noise.DelayMax, err2 = strconv.ParseUint(d[1], 10, 64)
+
+			} else {
+				config.Noise.DelayMin, err = strconv.ParseUint(d[0], 10, 64)
+				config.Noise.DelayMax = config.Noise.DelayMin
+			}
+			if err != nil {
+				return nil, errors.New("Invalid value for DelayMin").Base(err)
+			}
+			if err2 != nil {
+				return nil, errors.New("Invalid value for DelayMax").Base(err2)
+			}
+			if config.Noise.DelayMin > config.Noise.DelayMax {
+				config.Noise.DelayMin, config.Noise.DelayMax = config.Noise.DelayMax, config.Noise.DelayMin
+			}
+			if config.Noise.DelayMin == 0 {
+				return nil, errors.New("DelayMin or DelayMax cannot be 0")
+			}
+		} else {
+			config.Noise.DelayMin = 0
+		}
+	}
 
 	if c.Timeout != nil {
 		config.Timeout = *c.Timeout

proxy/freedom/config.pb.go

@@ -91,7 +91,7 @@ func (x Config_DomainStrategy) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use Config_DomainStrategy.Descriptor instead.
 func (Config_DomainStrategy) EnumDescriptor() ([]byte, []int) {
-	return file_proxy_freedom_config_proto_rawDescGZIP(), []int{2, 0}
+	return file_proxy_freedom_config_proto_rawDescGZIP(), []int{3, 0}
 }
 
 type DestinationOverride struct {
@@ -228,6 +228,85 @@ func (x *Fragment) GetIntervalMax() uint64 {
 	return 0
 }
 
+type Noise struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	LengthMin uint64 `protobuf:"varint,1,opt,name=length_min,json=lengthMin,proto3" json:"length_min,omitempty"`
+	LengthMax uint64 `protobuf:"varint,2,opt,name=length_max,json=lengthMax,proto3" json:"length_max,omitempty"`
+	DelayMin  uint64 `protobuf:"varint,3,opt,name=delay_min,json=delayMin,proto3" json:"delay_min,omitempty"`
+	DelayMax  uint64 `protobuf:"varint,4,opt,name=delay_max,json=delayMax,proto3" json:"delay_max,omitempty"`
+	StrNoise  string `protobuf:"bytes,5,opt,name=str_noise,json=strNoise,proto3" json:"str_noise,omitempty"`
+}
+
+func (x *Noise) Reset() {
+	*x = Noise{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_freedom_config_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Noise) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Noise) ProtoMessage() {}
+
+func (x *Noise) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_freedom_config_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Noise.ProtoReflect.Descriptor instead.
+func (*Noise) Descriptor() ([]byte, []int) {
+	return file_proxy_freedom_config_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *Noise) GetLengthMin() uint64 {
+	if x != nil {
+		return x.LengthMin
+	}
+	return 0
+}
+
+func (x *Noise) GetLengthMax() uint64 {
+	if x != nil {
+		return x.LengthMax
+	}
+	return 0
+}
+
+func (x *Noise) GetDelayMin() uint64 {
+	if x != nil {
+		return x.DelayMin
+	}
+	return 0
+}
+
+func (x *Noise) GetDelayMax() uint64 {
+	if x != nil {
+		return x.DelayMax
+	}
+	return 0
+}
+
+func (x *Noise) GetStrNoise() string {
+	if x != nil {
+		return x.StrNoise
+	}
+	return ""
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -240,12 +319,13 @@ type Config struct {
 	UserLevel           uint32               `protobuf:"varint,4,opt,name=user_level,json=userLevel,proto3" json:"user_level,omitempty"`
 	Fragment            *Fragment            `protobuf:"bytes,5,opt,name=fragment,proto3" json:"fragment,omitempty"`
 	ProxyProtocol       uint32               `protobuf:"varint,6,opt,name=proxy_protocol,json=proxyProtocol,proto3" json:"proxy_protocol,omitempty"`
+	Noise               *Noise               `protobuf:"bytes,7,opt,name=noise,proto3" json:"noise,omitempty"`
 }
 
 func (x *Config) Reset() {
 	*x = Config{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_proxy_freedom_config_proto_msgTypes[2]
+		mi := &file_proxy_freedom_config_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -258,7 +338,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_proxy_freedom_config_proto_msgTypes[2]
+	mi := &file_proxy_freedom_config_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -271,7 +351,7 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_proxy_freedom_config_proto_rawDescGZIP(), []int{2}
+	return file_proxy_freedom_config_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *Config) GetDomainStrategy() Config_DomainStrategy {
@@ -317,6 +397,13 @@ func (x *Config) GetProxyProtocol() uint32 {
 	return 0
 }
 
+func (x *Config) GetNoise() *Noise {
+	if x != nil {
+		return x.Noise
+	}
+	return nil
+}
+
 var File_proxy_freedom_config_proto protoreflect.FileDescriptor
 
 var file_proxy_freedom_config_proto_rawDesc = []byte{
@@ -343,29 +430,42 @@ var file_proxy_freedom_config_proto_rawDesc = []byte{
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@@ -398,24 +498,26 @@ func file_proxy_freedom_config_proto_rawDescGZIP() []byte {
 }
 
 var file_proxy_freedom_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_proxy_freedom_config_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_proxy_freedom_config_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
 var file_proxy_freedom_config_proto_goTypes = []any{
 	(Config_DomainStrategy)(0),      // 0: xray.proxy.freedom.Config.DomainStrategy
 	(*DestinationOverride)(nil),     // 1: xray.proxy.freedom.DestinationOverride
 	(*Fragment)(nil),                // 2: xray.proxy.freedom.Fragment
-	(*Config)(nil),                  // 3: xray.proxy.freedom.Config
+	(*Noise)(nil),                   // 3: xray.proxy.freedom.Noise
-	(*protocol.ServerEndpoint)(nil), // 4: xray.common.protocol.ServerEndpoint
+	(*Config)(nil),                  // 4: xray.proxy.freedom.Config
+	(*protocol.ServerEndpoint)(nil), // 5: xray.common.protocol.ServerEndpoint
 }
 var file_proxy_freedom_config_proto_depIdxs = []int32{
-	4, // 0: xray.proxy.freedom.DestinationOverride.server:type_name -> xray.common.protocol.ServerEndpoint
+	5, // 0: xray.proxy.freedom.DestinationOverride.server:type_name -> xray.common.protocol.ServerEndpoint
 	0, // 1: xray.proxy.freedom.Config.domain_strategy:type_name -> xray.proxy.freedom.Config.DomainStrategy
 	1, // 2: xray.proxy.freedom.Config.destination_override:type_name -> xray.proxy.freedom.DestinationOverride
 	2, // 3: xray.proxy.freedom.Config.fragment:type_name -> xray.proxy.freedom.Fragment
-	4, // [4:4] is the sub-list for method output_type
+	3, // 4: xray.proxy.freedom.Config.noise:type_name -> xray.proxy.freedom.Noise
-	4, // [4:4] is the sub-list for method input_type
+	5, // [5:5] is the sub-list for method output_type
-	4, // [4:4] is the sub-list for extension type_name
+	5, // [5:5] is the sub-list for method input_type
-	4, // [4:4] is the sub-list for extension extendee
+	5, // [5:5] is the sub-list for extension type_name
-	0, // [0:4] is the sub-list for field type_name
+	5, // [5:5] is the sub-list for extension extendee
+	0, // [0:5] is the sub-list for field type_name
 }
 
 func init() { file_proxy_freedom_config_proto_init() }
@@ -449,6 +551,18 @@ func file_proxy_freedom_config_proto_init() {
 			}
 		}
 		file_proxy_freedom_config_proto_msgTypes[2].Exporter = func(v any, i int) any {
+			switch v := v.(*Noise); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proxy_freedom_config_proto_msgTypes[3].Exporter = func(v any, i int) any {
 			switch v := v.(*Config); i {
 			case 0:
 				return &v.state
@@ -467,7 +581,7 @@ func file_proxy_freedom_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_proxy_freedom_config_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   3,
+			NumMessages:   4,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

proxy/freedom/config.proto

@@ -20,6 +20,13 @@ message Fragment {
   uint64 interval_min = 5;
   uint64 interval_max = 6;
 }
+message Noise {
+  uint64 length_min = 1;
+  uint64 length_max = 2;
+  uint64 delay_min = 3;
+  uint64 delay_max = 4;
+  string str_noise = 5;
+}
 
 message Config {
   enum DomainStrategy {
@@ -41,4 +48,5 @@ message Config {
   uint32 user_level = 4;
   Fragment fragment = 5;
   uint32 proxy_protocol = 6;
+  Noise noise = 7;
 }

proxy/freedom/freedom.go

@@ -208,6 +208,16 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 			}
 		} else {
 			writer = NewPacketWriter(conn, h, ctx, UDPOverride)
+			if h.config.Noise != nil {
+				errors.LogDebug(ctx, "NOISE", h.config.Noise.StrNoise, h.config.Noise.LengthMin, h.config.Noise.LengthMax,
+					h.config.Noise.DelayMin, h.config.Noise.DelayMax)
+				writer = &NoisePacketWriter{
+					Writer:      writer,
+					noise:       h.config.Noise,
+					firstWrite:  true,
+					UDPOverride: UDPOverride,
+				}
+			}
 		}
 
 		if err := buf.Copy(input, writer, buf.UpdateActivity(timer)); err != nil {
@@ -329,6 +339,7 @@ func NewPacketWriter(conn net.Conn, h *Handler, ctx context.Context, UDPOverride
 			UDPOverride: UDPOverride,
 			Conn:        iConn,
 		}
+
 	}
 	return &buf.SequentialWriter{Writer: conn}
 }
@@ -385,6 +396,45 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 	return nil
 }
 
+type NoisePacketWriter struct {
+	buf.Writer
+	noise       *Noise
+	firstWrite  bool
+	UDPOverride net.Destination
+}
+
+// MultiBuffer writer with Noise in first packet
+func (w *NoisePacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	if w.firstWrite {
+		w.firstWrite = false
+		//Do not send Noise for dns requests(just to be safe)
+		if w.UDPOverride.Port == 53 {
+			return w.Writer.WriteMultiBuffer(mb)
+		}
+		var noise []byte
+		var err error
+		//User input string
+		if w.noise.StrNoise != "" {
+			noise = []byte(w.noise.StrNoise)
+		} else {
+			//Random noise
+			noise, err = GenerateRandomBytes(randBetween(int64(w.noise.LengthMin),
+				int64(w.noise.LengthMax)))
+		}
+
+		if err != nil {
+			return err
+		}
+		w.Writer.WriteMultiBuffer(buf.MultiBuffer{buf.FromBytes(noise)})
+
+		if w.noise.DelayMin != 0 {
+			time.Sleep(time.Duration(randBetween(int64(w.noise.DelayMin), int64(w.noise.DelayMax))) * time.Millisecond)
+		}
+
+	}
+	return w.Writer.WriteMultiBuffer(mb)
+}
+
 type FragmentWriter struct {
 	fragment *Fragment
 	writer   io.Writer
@@ -471,3 +521,13 @@ func randBetween(left int64, right int64) int64 {
 	bigInt, _ := rand.Int(rand.Reader, big.NewInt(right-left))
 	return left + bigInt.Int64()
 }
+func GenerateRandomBytes(n int64) ([]byte, error) {
+	b := make([]byte, n)
+	_, err := rand.Read(b)
+	// Note that err == nil only if we read len(b) bytes.
+	if err != nil {
+		return nil, err
+	}
+
+	return b, nil
+}