mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-09-20 10:37:51 +00:00
340 lines
9.3 KiB
Go
340 lines
9.3 KiB
Go
package vless
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/rand"
|
|
"crypto/tls"
|
|
"io"
|
|
"math/big"
|
|
"net"
|
|
"reflect"
|
|
"time"
|
|
"unsafe"
|
|
|
|
C "github.com/sagernet/sing-box/constant"
|
|
"github.com/sagernet/sing/common"
|
|
"github.com/sagernet/sing/common/buf"
|
|
"github.com/sagernet/sing/common/bufio"
|
|
E "github.com/sagernet/sing/common/exceptions"
|
|
"github.com/sagernet/sing/common/logger"
|
|
N "github.com/sagernet/sing/common/network"
|
|
)
|
|
|
|
var tlsRegistry []func(conn net.Conn) (loaded bool, netConn net.Conn, reflectType reflect.Type, reflectPointer uintptr)
|
|
|
|
func init() {
|
|
tlsRegistry = append(tlsRegistry, func(conn net.Conn) (loaded bool, netConn net.Conn, reflectType reflect.Type, reflectPointer uintptr) {
|
|
tlsConn, loaded := conn.(*tls.Conn)
|
|
if !loaded {
|
|
return
|
|
}
|
|
return true, tlsConn.NetConn(), reflect.TypeOf(tlsConn).Elem(), uintptr(unsafe.Pointer(tlsConn))
|
|
})
|
|
}
|
|
|
|
type VisionConn struct {
|
|
net.Conn
|
|
writer N.VectorisedWriter
|
|
input *bytes.Reader
|
|
rawInput *bytes.Buffer
|
|
netConn net.Conn
|
|
logger logger.Logger
|
|
|
|
userUUID [16]byte
|
|
isTLS bool
|
|
numberOfPacketToFilter int
|
|
isTLS12orAbove bool
|
|
remainingServerHello int32
|
|
cipher uint16
|
|
enableXTLS bool
|
|
isPadding bool
|
|
directWrite bool
|
|
writeUUID bool
|
|
withinPaddingBuffers bool
|
|
remainingContent int
|
|
remainingPadding int
|
|
currentCommand int
|
|
directRead bool
|
|
remainingReader io.Reader
|
|
}
|
|
|
|
func NewVisionConn(conn net.Conn, userUUID [16]byte, logger logger.Logger) (*VisionConn, error) {
|
|
var (
|
|
loaded bool
|
|
reflectType reflect.Type
|
|
reflectPointer uintptr
|
|
netConn net.Conn
|
|
)
|
|
for _, tlsCreator := range tlsRegistry {
|
|
loaded, netConn, reflectType, reflectPointer = tlsCreator(conn)
|
|
if loaded {
|
|
break
|
|
}
|
|
}
|
|
if !loaded {
|
|
return nil, C.ErrTLSRequired
|
|
}
|
|
input, _ := reflectType.FieldByName("input")
|
|
rawInput, _ := reflectType.FieldByName("rawInput")
|
|
return &VisionConn{
|
|
Conn: conn,
|
|
writer: bufio.NewVectorisedWriter(conn),
|
|
input: (*bytes.Reader)(unsafe.Pointer(reflectPointer + input.Offset)),
|
|
rawInput: (*bytes.Buffer)(unsafe.Pointer(reflectPointer + rawInput.Offset)),
|
|
netConn: netConn,
|
|
logger: logger,
|
|
|
|
userUUID: userUUID,
|
|
numberOfPacketToFilter: 8,
|
|
remainingServerHello: -1,
|
|
isPadding: true,
|
|
writeUUID: true,
|
|
withinPaddingBuffers: true,
|
|
remainingContent: -1,
|
|
remainingPadding: -1,
|
|
}, nil
|
|
}
|
|
|
|
func (c *VisionConn) Read(p []byte) (n int, err error) {
|
|
if c.remainingReader != nil {
|
|
n, err = c.remainingReader.Read(p)
|
|
if err == io.EOF {
|
|
c.remainingReader = nil
|
|
if n > 0 {
|
|
err = nil
|
|
return
|
|
}
|
|
}
|
|
}
|
|
if c.directRead {
|
|
return c.netConn.Read(p)
|
|
}
|
|
n, err = c.Conn.Read(p)
|
|
if err != nil {
|
|
return
|
|
}
|
|
buffer := p[:n]
|
|
if c.withinPaddingBuffers || c.numberOfPacketToFilter > 0 {
|
|
buffers := c.unPadding(buffer)
|
|
if c.remainingContent == 0 && c.remainingPadding == 0 {
|
|
if c.currentCommand == 1 {
|
|
c.withinPaddingBuffers = false
|
|
c.remainingContent = -1
|
|
c.remainingPadding = -1
|
|
} else if c.currentCommand == 2 {
|
|
c.withinPaddingBuffers = false
|
|
c.directRead = true
|
|
|
|
inputBuffer, err := io.ReadAll(c.input)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
buffers = append(buffers, inputBuffer)
|
|
|
|
rawInputBuffer, err := io.ReadAll(c.rawInput)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
buffers = append(buffers, rawInputBuffer)
|
|
|
|
c.logger.Trace("XtlsRead readV")
|
|
} else if c.currentCommand == 0 {
|
|
c.withinPaddingBuffers = true
|
|
} else {
|
|
return 0, E.New("unknown command ", c.currentCommand)
|
|
}
|
|
} else if c.remainingContent > 0 || c.remainingPadding > 0 {
|
|
c.withinPaddingBuffers = true
|
|
} else {
|
|
c.withinPaddingBuffers = false
|
|
}
|
|
if c.numberOfPacketToFilter > 0 {
|
|
c.filterTLS(buffers)
|
|
}
|
|
c.remainingReader = io.MultiReader(common.Map(buffers, func(it []byte) io.Reader { return bytes.NewReader(it) })...)
|
|
return c.remainingReader.Read(p)
|
|
} else {
|
|
if c.numberOfPacketToFilter > 0 {
|
|
c.filterTLS([][]byte{buffer})
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
func (c *VisionConn) Write(p []byte) (n int, err error) {
|
|
if c.numberOfPacketToFilter > 0 {
|
|
c.filterTLS([][]byte{p})
|
|
}
|
|
if c.isPadding {
|
|
inputLen := len(p)
|
|
buffers := reshapeBuffer(p)
|
|
var specIndex int
|
|
for i, buffer := range buffers {
|
|
if c.isTLS && buffer.Len() > 6 && bytes.Equal(tlsApplicationDataStart, buffer.To(3)) {
|
|
var command byte = commandPaddingEnd
|
|
if c.enableXTLS {
|
|
c.directWrite = true
|
|
specIndex = i
|
|
command = commandPaddingDirect
|
|
}
|
|
c.isPadding = false
|
|
buffers[i] = c.padding(buffer, command)
|
|
break
|
|
} else if !c.isTLS12orAbove && c.numberOfPacketToFilter <= 1 {
|
|
c.isPadding = false
|
|
buffers[i] = c.padding(buffer, commandPaddingEnd)
|
|
break
|
|
}
|
|
buffers[i] = c.padding(buffer, commandPaddingContinue)
|
|
}
|
|
if c.directWrite {
|
|
encryptedBuffer := buffers[:specIndex+1]
|
|
err = c.writer.WriteVectorised(encryptedBuffer)
|
|
if err != nil {
|
|
return
|
|
}
|
|
buffers = buffers[specIndex+1:]
|
|
c.writer = bufio.NewVectorisedWriter(c.netConn)
|
|
c.logger.Trace("XtlsWrite writeV ", specIndex, " ", buf.LenMulti(encryptedBuffer), " ", len(buffers))
|
|
time.Sleep(5 * time.Millisecond) // wtf
|
|
}
|
|
err = c.writer.WriteVectorised(buffers)
|
|
if err == nil {
|
|
n = inputLen
|
|
}
|
|
return
|
|
}
|
|
if c.directWrite {
|
|
return c.netConn.Write(p)
|
|
} else {
|
|
return c.Conn.Write(p)
|
|
}
|
|
}
|
|
|
|
func (c *VisionConn) filterTLS(buffers [][]byte) {
|
|
for _, buffer := range buffers {
|
|
c.numberOfPacketToFilter--
|
|
if len(buffer) > 6 {
|
|
if buffer[0] == 22 && buffer[1] == 3 && buffer[2] == 3 {
|
|
c.isTLS = true
|
|
if buffer[5] == 2 {
|
|
c.isTLS12orAbove = true
|
|
c.remainingServerHello = (int32(buffer[3])<<8 | int32(buffer[4])) + 5
|
|
if len(buffer) >= 79 && c.remainingServerHello >= 79 {
|
|
sessionIdLen := int32(buffer[43])
|
|
cipherSuite := buffer[43+sessionIdLen+1 : 43+sessionIdLen+3]
|
|
c.cipher = uint16(cipherSuite[0])<<8 | uint16(cipherSuite[1])
|
|
} else {
|
|
c.logger.Trace("XtlsFilterTls short server hello, tls 1.2 or older? ", len(buffer), " ", c.remainingServerHello)
|
|
}
|
|
}
|
|
} else if bytes.Equal(tlsClientHandShakeStart, buffer[:2]) && buffer[5] == 1 {
|
|
c.isTLS = true
|
|
c.logger.Trace("XtlsFilterTls found tls client hello! ", len(buffer))
|
|
}
|
|
}
|
|
if c.remainingServerHello > 0 {
|
|
end := int(c.remainingServerHello)
|
|
if end > len(buffer) {
|
|
end = len(buffer)
|
|
}
|
|
c.remainingServerHello -= int32(end)
|
|
if bytes.Contains(buffer[:end], tls13SupportedVersions) {
|
|
cipher, ok := tls13CipherSuiteDic[c.cipher]
|
|
if ok && cipher != "TLS_AES_128_CCM_8_SHA256" {
|
|
c.enableXTLS = true
|
|
}
|
|
c.logger.Trace("XtlsFilterTls found tls 1.3! ", len(buffer), " ", c.cipher, " ", c.enableXTLS)
|
|
c.numberOfPacketToFilter = 0
|
|
return
|
|
} else if c.remainingServerHello == 0 {
|
|
c.logger.Trace("XtlsFilterTls found tls 1.2! ", len(buffer))
|
|
c.numberOfPacketToFilter = 0
|
|
return
|
|
}
|
|
}
|
|
if c.numberOfPacketToFilter == 0 {
|
|
c.logger.Trace("XtlsFilterTls stop filtering ", len(buffer))
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *VisionConn) padding(buffer *buf.Buffer, command byte) *buf.Buffer {
|
|
contentLen := 0
|
|
paddingLen := 0
|
|
if buffer != nil {
|
|
contentLen = buffer.Len()
|
|
}
|
|
if contentLen < 900 && c.isTLS {
|
|
l, _ := rand.Int(rand.Reader, big.NewInt(500))
|
|
paddingLen = int(l.Int64()) + 900 - contentLen
|
|
} else {
|
|
l, _ := rand.Int(rand.Reader, big.NewInt(256))
|
|
paddingLen = int(l.Int64())
|
|
}
|
|
newBuffer := buf.New()
|
|
if c.writeUUID {
|
|
newBuffer.Write(c.userUUID[:])
|
|
c.writeUUID = false
|
|
}
|
|
newBuffer.Write([]byte{command, byte(contentLen >> 8), byte(contentLen), byte(paddingLen >> 8), byte(paddingLen)})
|
|
if buffer != nil {
|
|
newBuffer.Write(buffer.Bytes())
|
|
buffer.Release()
|
|
}
|
|
newBuffer.Extend(paddingLen)
|
|
c.logger.Trace("XtlsPadding ", contentLen, " ", paddingLen, " ", command)
|
|
return newBuffer
|
|
}
|
|
|
|
func (c *VisionConn) unPadding(buffer []byte) [][]byte {
|
|
var bufferIndex int
|
|
if c.remainingContent == -1 && c.remainingPadding == -1 {
|
|
if len(buffer) >= 21 && bytes.Equal(c.userUUID[:], buffer[:16]) {
|
|
bufferIndex = 16
|
|
c.remainingContent = 0
|
|
c.remainingPadding = 0
|
|
c.currentCommand = 0
|
|
}
|
|
}
|
|
if c.remainingContent == -1 && c.remainingPadding == -1 {
|
|
return [][]byte{buffer}
|
|
}
|
|
var buffers [][]byte
|
|
for bufferIndex < len(buffer) {
|
|
if c.remainingContent <= 0 && c.remainingPadding <= 0 {
|
|
if c.currentCommand == 1 {
|
|
buffers = append(buffers, buffer[bufferIndex:])
|
|
break
|
|
} else {
|
|
paddingInfo := buffer[bufferIndex : bufferIndex+5]
|
|
c.currentCommand = int(paddingInfo[0])
|
|
c.remainingContent = int(paddingInfo[1])<<8 | int(paddingInfo[2])
|
|
c.remainingPadding = int(paddingInfo[3])<<8 | int(paddingInfo[4])
|
|
bufferIndex += 5
|
|
c.logger.Trace("Xtls Unpadding new block ", bufferIndex, " ", c.remainingContent, " padding ", c.remainingPadding, " ", c.currentCommand)
|
|
}
|
|
} else if c.remainingContent > 0 {
|
|
end := c.remainingContent
|
|
if end > len(buffer)-bufferIndex {
|
|
end = len(buffer) - bufferIndex
|
|
}
|
|
buffers = append(buffers, buffer[bufferIndex:bufferIndex+end])
|
|
c.remainingContent -= end
|
|
bufferIndex += end
|
|
} else {
|
|
end := c.remainingPadding
|
|
if end > len(buffer)-bufferIndex {
|
|
end = len(buffer) - bufferIndex
|
|
}
|
|
c.remainingPadding -= end
|
|
bufferIndex += end
|
|
}
|
|
if bufferIndex == len(buffer) {
|
|
break
|
|
}
|
|
}
|
|
return buffers
|
|
}
|