From cde6e33ec96e301992023e59282e2a1c01fc53fa Mon Sep 17 00:00:00 2001 From: patterniha <71074308+patterniha@users.noreply.github.com> Date: Fri, 8 Aug 2025 01:56:09 +0200 Subject: [PATCH] Freedom: Add `maxSplit` fragment option; Add `applyTo` noises option (#4998) --- infra/conf/freedom.go | 25 ++++++- proxy/freedom/config.pb.go | 134 +++++++++++++++++++++++-------------- proxy/freedom/config.proto | 3 + proxy/freedom/freedom.go | 57 +++++++++++----- 4 files changed, 148 insertions(+), 71 deletions(-) diff --git a/infra/conf/freedom.go b/infra/conf/freedom.go index 15f1bcff..39b1a431 100644 --- a/infra/conf/freedom.go +++ b/infra/conf/freedom.go @@ -27,12 +27,14 @@ type Fragment struct { Packets string `json:"packets"` Length *Int32Range `json:"length"` Interval *Int32Range `json:"interval"` + MaxSplit *Int32Range `json:"maxSplit"` } type Noise struct { - Type string `json:"type"` - Packet string `json:"packet"` - Delay *Int32Range `json:"delay"` + Type string `json:"type"` + Packet string `json:"packet"` + Delay *Int32Range `json:"delay"` + ApplyTo string `json:"applyTo"` } // Build implements Buildable @@ -108,6 +110,13 @@ func (c *FreedomConfig) Build() (proto.Message, error) { config.Fragment.IntervalMin = uint64(c.Fragment.Interval.From) config.Fragment.IntervalMax = uint64(c.Fragment.Interval.To) } + + { + if c.Fragment.MaxSplit != nil { + config.Fragment.MaxSplitMin = uint64(c.Fragment.MaxSplit.From) + config.Fragment.MaxSplitMax = uint64(c.Fragment.MaxSplit.To) + } + } } if c.Noise != nil { @@ -193,5 +202,15 @@ func ParseNoise(noise *Noise) (*freedom.Noise, error) { NConfig.DelayMin = uint64(noise.Delay.From) NConfig.DelayMax = uint64(noise.Delay.To) } + switch strings.ToLower(noise.ApplyTo) { + case "", "ip", "all": + NConfig.ApplyTo = "ip" + case "ipv4": + NConfig.ApplyTo = "ipv4" + case "ipv6": + NConfig.ApplyTo = "ipv6" + default: + return nil, errors.New("Invalid applyTo, only ip/ipv4/ipv6 are supported") + } return NConfig, nil } diff --git a/proxy/freedom/config.pb.go b/proxy/freedom/config.pb.go index 83bb15d6..96855aec 100644 --- a/proxy/freedom/config.pb.go +++ b/proxy/freedom/config.pb.go @@ -150,6 +150,8 @@ type Fragment struct { LengthMax uint64 `protobuf:"varint,4,opt,name=length_max,json=lengthMax,proto3" json:"length_max,omitempty"` IntervalMin uint64 `protobuf:"varint,5,opt,name=interval_min,json=intervalMin,proto3" json:"interval_min,omitempty"` IntervalMax uint64 `protobuf:"varint,6,opt,name=interval_max,json=intervalMax,proto3" json:"interval_max,omitempty"` + MaxSplitMin uint64 `protobuf:"varint,7,opt,name=max_split_min,json=maxSplitMin,proto3" json:"max_split_min,omitempty"` + MaxSplitMax uint64 `protobuf:"varint,8,opt,name=max_split_max,json=maxSplitMax,proto3" json:"max_split_max,omitempty"` } func (x *Fragment) Reset() { @@ -224,6 +226,20 @@ func (x *Fragment) GetIntervalMax() uint64 { return 0 } +func (x *Fragment) GetMaxSplitMin() uint64 { + if x != nil { + return x.MaxSplitMin + } + return 0 +} + +func (x *Fragment) GetMaxSplitMax() uint64 { + if x != nil { + return x.MaxSplitMax + } + return 0 +} + type Noise struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -234,6 +250,7 @@ type Noise struct { 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"` Packet []byte `protobuf:"bytes,5,opt,name=packet,proto3" json:"packet,omitempty"` + ApplyTo string `protobuf:"bytes,6,opt,name=apply_to,json=applyTo,proto3" json:"apply_to,omitempty"` } func (x *Noise) Reset() { @@ -301,6 +318,13 @@ func (x *Noise) GetPacket() []byte { return nil } +func (x *Noise) GetApplyTo() string { + if x != nil { + return x.ApplyTo + } + return "" +} + type Config struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -399,7 +423,7 @@ var file_proxy_freedom_config_proto_rawDesc = []byte{ 0x72, 0x76, 0x65, 0x72, 0x18, 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= 4; bytes packet = 5; + string apply_to = 6; } message Config { diff --git a/proxy/freedom/freedom.go b/proxy/freedom/freedom.go index 1f9d5ae5..99b24fef 100644 --- a/proxy/freedom/freedom.go +++ b/proxy/freedom/freedom.go @@ -194,7 +194,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte if destination.Network == net.Network_TCP { if h.config.Fragment != nil { errors.LogDebug(ctx, "FRAGMENT", h.config.Fragment.PacketsFrom, h.config.Fragment.PacketsTo, h.config.Fragment.LengthMin, h.config.Fragment.LengthMax, - h.config.Fragment.IntervalMin, h.config.Fragment.IntervalMax) + h.config.Fragment.IntervalMin, h.config.Fragment.IntervalMax, h.config.Fragment.MaxSplitMin, h.config.Fragment.MaxSplitMax) writer = buf.NewWriter(&FragmentWriter{ fragment: h.config.Fragment, writer: conn, @@ -211,6 +211,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte noises: h.config.Noises, firstWrite: true, UDPOverride: UDPOverride, + remoteAddr: net.DestinationFromAddr(conn.RemoteAddr()).Address, } } } @@ -289,14 +290,13 @@ func NewPacketReader(conn net.Conn, UDPOverride net.Destination, DialDest net.De if UDPOverride.Address != nil || UDPOverride.Port != 0 { isOverridden = true } - changedAddress, _, _ := net.SplitHostPort(conn.RemoteAddr().String()) return &PacketReader{ PacketConnWrapper: c, Counter: counter, IsOverridden: isOverridden, InitUnchangedAddr: DialDest.Address, - InitChangedAddr: net.ParseAddress(changedAddress), + InitChangedAddr: net.DestinationFromAddr(conn.RemoteAddr()).Address, } } return &buf.PacketReader{Reader: conn} @@ -354,8 +354,7 @@ func NewPacketWriter(conn net.Conn, h *Handler, ctx context.Context, UDPOverride // check this behavior and add it to map resolvedUDPAddr := utils.NewTypedSyncMap[string, net.Address]() if DialDest.Address.Family().IsDomain() { - RemoteAddress, _, _ := net.SplitHostPort(conn.RemoteAddr().String()) - resolvedUDPAddr.Store(DialDest.Address.String(), net.ParseAddress(RemoteAddress)) + resolvedUDPAddr.Store(DialDest.Address.Domain(), net.DestinationFromAddr(conn.RemoteAddr()).Address) } return &PacketWriter{ PacketConnWrapper: c, @@ -456,6 +455,7 @@ type NoisePacketWriter struct { noises []*Noise firstWrite bool UDPOverride net.Destination + remoteAddr net.Address } // MultiBuffer writer with Noise before first packet @@ -468,8 +468,24 @@ func (w *NoisePacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error { } var noise []byte var err error + if w.remoteAddr.Family().IsDomain() { + panic("impossible, remoteAddr is always IP") + } for _, n := range w.noises { - //User input string or base64 encoded string + switch n.ApplyTo { + case "ipv4": + if w.remoteAddr.Family().IsIPv6() { + continue + } + case "ipv6": + if w.remoteAddr.Family().IsIPv4() { + continue + } + case "ip": + default: + panic("unreachable, applyTo is ip/ipv4/ipv6") + } + //User input string or base64 encoded string or hex string if n.Packet != nil { noise = n.Packet } else { @@ -509,23 +525,29 @@ func (f *FragmentWriter) Write(b []byte) (int, error) { return f.writer.Write(b) } data := b[5:recordLen] - buf := make([]byte, 1024) + buff := make([]byte, 2048) var hello []byte + maxSplit := crypto.RandBetween(int64(f.fragment.MaxSplitMin), int64(f.fragment.MaxSplitMax)) + var splitNum int64 for from := 0; ; { to := from + int(crypto.RandBetween(int64(f.fragment.LengthMin), int64(f.fragment.LengthMax))) - if to > len(data) { + splitNum++ + if to > len(data) || (maxSplit > 0 && splitNum >= maxSplit) { to = len(data) } - copy(buf[:3], b) - copy(buf[5:], data[from:to]) l := to - from + if 5+l > len(buff) { + buff = make([]byte, 5+l) + } + copy(buff[:3], b) + copy(buff[5:], data[from:to]) from = to - buf[3] = byte(l >> 8) - buf[4] = byte(l) + buff[3] = byte(l >> 8) + buff[4] = byte(l) if f.fragment.IntervalMax == 0 { // combine fragmented tlshello if interval is 0 - hello = append(hello, buf[:5+l]...) + hello = append(hello, buff[:5+l]...) } else { - _, err := f.writer.Write(buf[:5+l]) + _, err := f.writer.Write(buff[:5+l]) time.Sleep(time.Duration(crypto.RandBetween(int64(f.fragment.IntervalMin), int64(f.fragment.IntervalMax))) * time.Millisecond) if err != nil { return 0, err @@ -552,17 +574,20 @@ func (f *FragmentWriter) Write(b []byte) (int, error) { if f.fragment.PacketsFrom != 0 && (f.count < f.fragment.PacketsFrom || f.count > f.fragment.PacketsTo) { return f.writer.Write(b) } + maxSplit := crypto.RandBetween(int64(f.fragment.MaxSplitMin), int64(f.fragment.MaxSplitMax)) + var splitNum int64 for from := 0; ; { to := from + int(crypto.RandBetween(int64(f.fragment.LengthMin), int64(f.fragment.LengthMax))) - if to > len(b) { + splitNum++ + if to > len(b) || (maxSplit > 0 && splitNum >= maxSplit) { to = len(b) } n, err := f.writer.Write(b[from:to]) from += n - time.Sleep(time.Duration(crypto.RandBetween(int64(f.fragment.IntervalMin), int64(f.fragment.IntervalMax))) * time.Millisecond) if err != nil { return from, err } + time.Sleep(time.Duration(crypto.RandBetween(int64(f.fragment.IntervalMin), int64(f.fragment.IntervalMax))) * time.Millisecond) if from >= len(b) { return from, nil }