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Code Issues Releases Wiki Activity

Freedom: Add `maxSplit` fragment option; Add `applyTo` noises option (#4998)

pull/5001/head
patterniha 2025-08-08 01:56:09 +02:00 committed by GitHub
parent 5dce7e4e25
commit cde6e33ec9
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
4 changed files with 148 additions and 71 deletions
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25
infra/conf/freedom.go
View File

@ -27,12 +27,14 @@ type Fragment struct {
Packets string `json:"packets"` Packets string `json:"packets"`
Length *Int32Range `json:"length"` Length *Int32Range `json:"length"`
Interval *Int32Range `json:"interval"` Interval *Int32Range `json:"interval"`
MaxSplit *Int32Range `json:"maxSplit"`
} }
type Noise struct { type Noise struct {
Type string `json:"type"` Type string `json:"type"`
Packet string `json:"packet"` Packet string `json:"packet"`
Delay *Int32Range `json:"delay"` Delay *Int32Range `json:"delay"`
ApplyTo string `json:"applyTo"`
} }
// Build implements Buildable // Build implements Buildable
@ -108,6 +110,13 @@ func (c *FreedomConfig) Build() (proto.Message, error) {
config.Fragment.IntervalMin = uint64(c.Fragment.Interval.From) config.Fragment.IntervalMin = uint64(c.Fragment.Interval.From)
config.Fragment.IntervalMax = uint64(c.Fragment.Interval.To) 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 { if c.Noise != nil {
@ -193,5 +202,15 @@ func ParseNoise(noise *Noise) (*freedom.Noise, error) {
NConfig.DelayMin = uint64(noise.Delay.From) NConfig.DelayMin = uint64(noise.Delay.From)
NConfig.DelayMax = uint64(noise.Delay.To) 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 return NConfig, nil
} }

134
proxy/freedom/config.pb.go
View File

@ -150,6 +150,8 @@ type Fragment struct {
LengthMax uint64 `protobuf:"varint,4,opt,name=length_max,json=lengthMax,proto3" json:"length_max,omitempty"` 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"` 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"` 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() { func (x *Fragment) Reset() {
@ -224,6 +226,20 @@ func (x *Fragment) GetIntervalMax() uint64 {
return 0 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 { type Noise struct {
state protoimpl.MessageState state protoimpl.MessageState
sizeCache protoimpl.SizeCache 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"` 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"` 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"` 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() { func (x *Noise) Reset() {
@ -301,6 +318,13 @@ func (x *Noise) GetPacket() []byte {
return nil return nil
} }
func (x *Noise) GetApplyTo() string {
if x != nil {
return x.ApplyTo
}
return ""
}
type Config struct { type Config struct {
state protoimpl.MessageState state protoimpl.MessageState
sizeCache protoimpl.SizeCache sizeCache protoimpl.SizeCache
@ -399,7 +423,7 @@ var file_proxy_freedom_config_proto_rawDesc = []byte{
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@ -412,57 +436,63 @@ var file_proxy_freedom_config_proto_rawDesc = []byte{
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} }
var ( var (

3
proxy/freedom/config.proto
View File

@ -19,6 +19,8 @@ message Fragment {
uint64 length_max = 4; uint64 length_max = 4;
uint64 interval_min = 5; uint64 interval_min = 5;
uint64 interval_max = 6; uint64 interval_max = 6;
uint64 max_split_min = 7;
uint64 max_split_max = 8;
} }
message Noise { message Noise {
uint64 length_min = 1; uint64 length_min = 1;
@ -26,6 +28,7 @@ message Noise {
uint64 delay_min = 3; uint64 delay_min = 3;
uint64 delay_max = 4; uint64 delay_max = 4;
bytes packet = 5; bytes packet = 5;
string apply_to = 6;
} }
message Config { message Config {

57
proxy/freedom/freedom.go
View File

@ -194,7 +194,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
if destination.Network == net.Network_TCP { if destination.Network == net.Network_TCP {
if h.config.Fragment != nil { 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, 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{ writer = buf.NewWriter(&FragmentWriter{
fragment: h.config.Fragment, fragment: h.config.Fragment,
writer: conn, writer: conn,
@ -211,6 +211,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
noises: h.config.Noises, noises: h.config.Noises,
firstWrite: true, firstWrite: true,
UDPOverride: UDPOverride, 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 { if UDPOverride.Address != nil || UDPOverride.Port != 0 {
isOverridden = true isOverridden = true
} }
changedAddress, _, _ := net.SplitHostPort(conn.RemoteAddr().String())
return &PacketReader{ return &PacketReader{
PacketConnWrapper: c, PacketConnWrapper: c,
Counter: counter, Counter: counter,
IsOverridden: isOverridden, IsOverridden: isOverridden,
InitUnchangedAddr: DialDest.Address, InitUnchangedAddr: DialDest.Address,
InitChangedAddr: net.ParseAddress(changedAddress), InitChangedAddr: net.DestinationFromAddr(conn.RemoteAddr()).Address,
} }
} }
return &buf.PacketReader{Reader: conn} 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 // check this behavior and add it to map
resolvedUDPAddr := utils.NewTypedSyncMap[string, net.Address]() resolvedUDPAddr := utils.NewTypedSyncMap[string, net.Address]()
if DialDest.Address.Family().IsDomain() { if DialDest.Address.Family().IsDomain() {
RemoteAddress, _, _ := net.SplitHostPort(conn.RemoteAddr().String()) resolvedUDPAddr.Store(DialDest.Address.Domain(), net.DestinationFromAddr(conn.RemoteAddr()).Address)
resolvedUDPAddr.Store(DialDest.Address.String(), net.ParseAddress(RemoteAddress))
} }
return &PacketWriter{ return &PacketWriter{
PacketConnWrapper: c, PacketConnWrapper: c,
@ -456,6 +455,7 @@ type NoisePacketWriter struct {
noises []*Noise noises []*Noise
firstWrite bool firstWrite bool
UDPOverride net.Destination UDPOverride net.Destination
remoteAddr net.Address
} }
// MultiBuffer writer with Noise before first packet // MultiBuffer writer with Noise before first packet
@ -468,8 +468,24 @@ func (w *NoisePacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
} }
var noise []byte var noise []byte
var err error var err error
if w.remoteAddr.Family().IsDomain() {
panic("impossible, remoteAddr is always IP")
}
for _, n := range w.noises { 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 { if n.Packet != nil {
noise = n.Packet noise = n.Packet
} else { } else {
@ -509,23 +525,29 @@ func (f *FragmentWriter) Write(b []byte) (int, error) {
return f.writer.Write(b) return f.writer.Write(b)
} }
data := b[5:recordLen] data := b[5:recordLen]
buf := make([]byte, 1024) buff := make([]byte, 2048)
var hello []byte var hello []byte
maxSplit := crypto.RandBetween(int64(f.fragment.MaxSplitMin), int64(f.fragment.MaxSplitMax))
var splitNum int64
for from := 0; ; { for from := 0; ; {
to := from + int(crypto.RandBetween(int64(f.fragment.LengthMin), int64(f.fragment.LengthMax))) 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) to = len(data)
} }
copy(buf[:3], b)
copy(buf[5:], data[from:to])
l := to - from 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 from = to
buf[3] = byte(l >> 8) buff[3] = byte(l >> 8)
buf[4] = byte(l) buff[4] = byte(l)
if f.fragment.IntervalMax == 0 { // combine fragmented tlshello if interval is 0 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 { } 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) time.Sleep(time.Duration(crypto.RandBetween(int64(f.fragment.IntervalMin), int64(f.fragment.IntervalMax))) * time.Millisecond)
if err != nil { if err != nil {
return 0, err 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) { if f.fragment.PacketsFrom != 0 && (f.count < f.fragment.PacketsFrom || f.count > f.fragment.PacketsTo) {
return f.writer.Write(b) return f.writer.Write(b)
} }
maxSplit := crypto.RandBetween(int64(f.fragment.MaxSplitMin), int64(f.fragment.MaxSplitMax))
var splitNum int64
for from := 0; ; { for from := 0; ; {
to := from + int(crypto.RandBetween(int64(f.fragment.LengthMin), int64(f.fragment.LengthMax))) 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) to = len(b)
} }
n, err := f.writer.Write(b[from:to]) n, err := f.writer.Write(b[from:to])
from += n from += n
time.Sleep(time.Duration(crypto.RandBetween(int64(f.fragment.IntervalMin), int64(f.fragment.IntervalMax))) * time.Millisecond)
if err != nil { if err != nil {
return from, err return from, err
} }
time.Sleep(time.Duration(crypto.RandBetween(int64(f.fragment.IntervalMin), int64(f.fragment.IntervalMax))) * time.Millisecond)
if from >= len(b) { if from >= len(b) {
return from, nil return from, nil
} }