From 002d08bf834ed6abfb402a040300bd17f2f3b21b Mon Sep 17 00:00:00 2001 From: dragonbreath2000 <168475359+dragonbreath2000@users.noreply.github.com> Date: Wed, 28 Aug 2024 14:10:11 -0700 Subject: [PATCH] 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 | 76 +++++++++++++++ proxy/freedom/config.pb.go | 188 +++++++++++++++++++++++++++++-------- proxy/freedom/config.proto | 8 ++ proxy/freedom/freedom.go | 60 ++++++++++++ 4 files changed, 295 insertions(+), 37 deletions(-) diff --git a/infra/conf/freedom.go b/infra/conf/freedom.go index d90b7c2d..e172afa8 100644 --- a/infra/conf/freedom.go +++ b/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 diff --git a/proxy/freedom/config.pb.go b/proxy/freedom/config.pb.go index 723d4de4..9d829251 100644 --- a/proxy/freedom/config.pb.go +++ b/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{ 0x6c, 0x5f, 0x6d, 0x69, 0x6e, 0x18, 0x05, 0x20, 0x01, 0x28, 0x04, 0x52, 0x0b, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x76, 0x61, 0x6c, 0x4d, 0x69, 0x6e, 0x12, 0x21, 0x0a, 0x0c, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x76, 0x61, 0x6c, 0x5f, 0x6d, 0x61, 0x78, 0x18, 0x06, 0x20, 0x01, 0x28, 0x04, 0x52, 0x0b, - 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(*Config)(nil), // 3: xray.proxy.freedom.Config - (*protocol.ServerEndpoint)(nil), // 4: xray.common.protocol.ServerEndpoint + (*Noise)(nil), // 3: xray.proxy.freedom.Noise + (*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 - 4, // [4:4] is the sub-list for method input_type - 4, // [4:4] is the sub-list for extension type_name - 4, // [4:4] is the sub-list for extension extendee - 0, // [0:4] is the sub-list for field type_name + 3, // 4: xray.proxy.freedom.Config.noise:type_name -> xray.proxy.freedom.Noise + 5, // [5:5] is the sub-list for method output_type + 5, // [5:5] is the sub-list for method input_type + 5, // [5:5] is the sub-list for extension 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, }, diff --git a/proxy/freedom/config.proto b/proxy/freedom/config.proto index 1eabedb7..85b71979 100644 --- a/proxy/freedom/config.proto +++ b/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; } diff --git a/proxy/freedom/freedom.go b/proxy/freedom/freedom.go index feee98c0..c387d158 100644 --- a/proxy/freedom/freedom.go +++ b/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 +}