mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-13 04:13:16 +00:00
340 lines
9.3 KiB
Go
340 lines
9.3 KiB
Go
package vless
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import (
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"bytes"
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"crypto/rand"
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"crypto/tls"
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"io"
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"math/big"
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"net"
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"reflect"
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"time"
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"unsafe"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/buf"
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"github.com/sagernet/sing/common/bufio"
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E "github.com/sagernet/sing/common/exceptions"
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"github.com/sagernet/sing/common/logger"
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N "github.com/sagernet/sing/common/network"
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)
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var tlsRegistry []func(conn net.Conn) (loaded bool, netConn net.Conn, reflectType reflect.Type, reflectPointer uintptr)
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func init() {
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tlsRegistry = append(tlsRegistry, func(conn net.Conn) (loaded bool, netConn net.Conn, reflectType reflect.Type, reflectPointer uintptr) {
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tlsConn, loaded := conn.(*tls.Conn)
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if !loaded {
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return
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}
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return true, tlsConn.NetConn(), reflect.TypeOf(tlsConn).Elem(), uintptr(unsafe.Pointer(tlsConn))
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})
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}
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type VisionConn struct {
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net.Conn
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writer N.VectorisedWriter
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input *bytes.Reader
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rawInput *bytes.Buffer
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netConn net.Conn
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logger logger.Logger
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userUUID [16]byte
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isTLS bool
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numberOfPacketToFilter int
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isTLS12orAbove bool
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remainingServerHello int32
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cipher uint16
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enableXTLS bool
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isPadding bool
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directWrite bool
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writeUUID bool
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withinPaddingBuffers bool
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remainingContent int
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remainingPadding int
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currentCommand int
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directRead bool
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remainingReader io.Reader
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}
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func NewVisionConn(conn net.Conn, userUUID [16]byte, logger logger.Logger) (*VisionConn, error) {
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var (
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loaded bool
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reflectType reflect.Type
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reflectPointer uintptr
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netConn net.Conn
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)
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for _, tlsCreator := range tlsRegistry {
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loaded, netConn, reflectType, reflectPointer = tlsCreator(conn)
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if loaded {
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break
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}
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}
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if !loaded {
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return nil, C.ErrTLSRequired
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}
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input, _ := reflectType.FieldByName("input")
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rawInput, _ := reflectType.FieldByName("rawInput")
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return &VisionConn{
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Conn: conn,
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writer: bufio.NewVectorisedWriter(conn),
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input: (*bytes.Reader)(unsafe.Pointer(reflectPointer + input.Offset)),
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rawInput: (*bytes.Buffer)(unsafe.Pointer(reflectPointer + rawInput.Offset)),
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netConn: netConn,
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logger: logger,
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userUUID: userUUID,
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numberOfPacketToFilter: 8,
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remainingServerHello: -1,
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isPadding: true,
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writeUUID: true,
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withinPaddingBuffers: true,
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remainingContent: -1,
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remainingPadding: -1,
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}, nil
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}
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func (c *VisionConn) Read(p []byte) (n int, err error) {
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if c.remainingReader != nil {
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n, err = c.remainingReader.Read(p)
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if err == io.EOF {
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c.remainingReader = nil
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if n > 0 {
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err = nil
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return
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}
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}
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}
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if c.directRead {
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return c.netConn.Read(p)
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}
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n, err = c.Conn.Read(p)
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if err != nil {
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return
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}
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buffer := p[:n]
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if c.withinPaddingBuffers || c.numberOfPacketToFilter > 0 {
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buffers := c.unPadding(buffer)
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if c.remainingContent == 0 && c.remainingPadding == 0 {
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if c.currentCommand == 1 {
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c.withinPaddingBuffers = false
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c.remainingContent = -1
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c.remainingPadding = -1
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} else if c.currentCommand == 2 {
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c.withinPaddingBuffers = false
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c.directRead = true
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inputBuffer, err := io.ReadAll(c.input)
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if err != nil {
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return 0, err
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}
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buffers = append(buffers, inputBuffer)
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rawInputBuffer, err := io.ReadAll(c.rawInput)
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if err != nil {
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return 0, err
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}
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buffers = append(buffers, rawInputBuffer)
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c.logger.Trace("XtlsRead readV")
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} else if c.currentCommand == 0 {
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c.withinPaddingBuffers = true
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} else {
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return 0, E.New("unknown command ", c.currentCommand)
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}
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} else if c.remainingContent > 0 || c.remainingPadding > 0 {
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c.withinPaddingBuffers = true
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} else {
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c.withinPaddingBuffers = false
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}
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if c.numberOfPacketToFilter > 0 {
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c.filterTLS(buffers)
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}
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c.remainingReader = io.MultiReader(common.Map(buffers, func(it []byte) io.Reader { return bytes.NewReader(it) })...)
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return c.remainingReader.Read(p)
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} else {
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if c.numberOfPacketToFilter > 0 {
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c.filterTLS([][]byte{buffer})
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}
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return
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}
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}
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func (c *VisionConn) Write(p []byte) (n int, err error) {
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if c.numberOfPacketToFilter > 0 {
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c.filterTLS([][]byte{p})
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}
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if c.isPadding {
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inputLen := len(p)
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buffers := reshapeBuffer(p)
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var specIndex int
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for i, buffer := range buffers {
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if c.isTLS && buffer.Len() > 6 && bytes.Equal(tlsApplicationDataStart, buffer.To(3)) {
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var command byte = commandPaddingEnd
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if c.enableXTLS {
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c.directWrite = true
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specIndex = i
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command = commandPaddingDirect
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}
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c.isPadding = false
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buffers[i] = c.padding(buffer, command)
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break
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} else if !c.isTLS12orAbove && c.numberOfPacketToFilter <= 1 {
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c.isPadding = false
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buffers[i] = c.padding(buffer, commandPaddingEnd)
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break
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}
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buffers[i] = c.padding(buffer, commandPaddingContinue)
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}
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if c.directWrite {
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encryptedBuffer := buffers[:specIndex+1]
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err = c.writer.WriteVectorised(encryptedBuffer)
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if err != nil {
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return
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}
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buffers = buffers[specIndex+1:]
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c.writer = bufio.NewVectorisedWriter(c.netConn)
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c.logger.Trace("XtlsWrite writeV ", specIndex, " ", buf.LenMulti(encryptedBuffer), " ", len(buffers))
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time.Sleep(5 * time.Millisecond) // wtf
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}
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err = c.writer.WriteVectorised(buffers)
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if err == nil {
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n = inputLen
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}
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return
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}
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if c.directWrite {
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return c.netConn.Write(p)
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} else {
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return c.Conn.Write(p)
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}
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}
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func (c *VisionConn) filterTLS(buffers [][]byte) {
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for _, buffer := range buffers {
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c.numberOfPacketToFilter--
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if len(buffer) > 6 {
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if buffer[0] == 22 && buffer[1] == 3 && buffer[2] == 3 {
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c.isTLS = true
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if buffer[5] == 2 {
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c.isTLS12orAbove = true
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c.remainingServerHello = (int32(buffer[3])<<8 | int32(buffer[4])) + 5
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if len(buffer) >= 79 && c.remainingServerHello >= 79 {
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sessionIdLen := int32(buffer[43])
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cipherSuite := buffer[43+sessionIdLen+1 : 43+sessionIdLen+3]
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c.cipher = uint16(cipherSuite[0])<<8 | uint16(cipherSuite[1])
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} else {
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c.logger.Trace("XtlsFilterTls short server hello, tls 1.2 or older? ", len(buffer), " ", c.remainingServerHello)
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}
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}
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} else if bytes.Equal(tlsClientHandShakeStart, buffer[:2]) && buffer[5] == 1 {
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c.isTLS = true
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c.logger.Trace("XtlsFilterTls found tls client hello! ", len(buffer))
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}
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}
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if c.remainingServerHello > 0 {
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end := int(c.remainingServerHello)
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if end > len(buffer) {
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end = len(buffer)
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}
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c.remainingServerHello -= int32(end)
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if bytes.Contains(buffer[:end], tls13SupportedVersions) {
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cipher, ok := tls13CipherSuiteDic[c.cipher]
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if ok && cipher != "TLS_AES_128_CCM_8_SHA256" {
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c.enableXTLS = true
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}
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c.logger.Trace("XtlsFilterTls found tls 1.3! ", len(buffer), " ", c.cipher, " ", c.enableXTLS)
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c.numberOfPacketToFilter = 0
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return
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} else if c.remainingServerHello == 0 {
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c.logger.Trace("XtlsFilterTls found tls 1.2! ", len(buffer))
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c.numberOfPacketToFilter = 0
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return
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}
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}
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if c.numberOfPacketToFilter == 0 {
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c.logger.Trace("XtlsFilterTls stop filtering ", len(buffer))
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}
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}
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}
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func (c *VisionConn) padding(buffer *buf.Buffer, command byte) *buf.Buffer {
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contentLen := 0
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paddingLen := 0
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if buffer != nil {
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contentLen = buffer.Len()
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}
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if contentLen < 900 && c.isTLS {
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l, _ := rand.Int(rand.Reader, big.NewInt(500))
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paddingLen = int(l.Int64()) + 900 - contentLen
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} else {
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l, _ := rand.Int(rand.Reader, big.NewInt(256))
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paddingLen = int(l.Int64())
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}
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newBuffer := buf.New()
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if c.writeUUID {
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newBuffer.Write(c.userUUID[:])
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c.writeUUID = false
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}
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newBuffer.Write([]byte{command, byte(contentLen >> 8), byte(contentLen), byte(paddingLen >> 8), byte(paddingLen)})
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if buffer != nil {
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newBuffer.Write(buffer.Bytes())
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buffer.Release()
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}
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newBuffer.Extend(paddingLen)
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c.logger.Trace("XtlsPadding ", contentLen, " ", paddingLen, " ", command)
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return newBuffer
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}
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func (c *VisionConn) unPadding(buffer []byte) [][]byte {
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var bufferIndex int
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if c.remainingContent == -1 && c.remainingPadding == -1 {
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if len(buffer) >= 21 && bytes.Equal(c.userUUID[:], buffer[:16]) {
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bufferIndex = 16
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c.remainingContent = 0
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c.remainingPadding = 0
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c.currentCommand = 0
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}
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}
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if c.remainingContent == -1 && c.remainingPadding == -1 {
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return [][]byte{buffer}
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}
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var buffers [][]byte
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for bufferIndex < len(buffer) {
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if c.remainingContent <= 0 && c.remainingPadding <= 0 {
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if c.currentCommand == 1 {
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buffers = append(buffers, buffer[bufferIndex:])
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break
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} else {
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paddingInfo := buffer[bufferIndex : bufferIndex+5]
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c.currentCommand = int(paddingInfo[0])
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c.remainingContent = int(paddingInfo[1])<<8 | int(paddingInfo[2])
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c.remainingPadding = int(paddingInfo[3])<<8 | int(paddingInfo[4])
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bufferIndex += 5
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c.logger.Trace("Xtls Unpadding new block ", bufferIndex, " ", c.remainingContent, " padding ", c.remainingPadding, " ", c.currentCommand)
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}
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} else if c.remainingContent > 0 {
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end := c.remainingContent
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if end > len(buffer)-bufferIndex {
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end = len(buffer) - bufferIndex
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}
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buffers = append(buffers, buffer[bufferIndex:bufferIndex+end])
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c.remainingContent -= end
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bufferIndex += end
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} else {
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end := c.remainingPadding
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if end > len(buffer)-bufferIndex {
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end = len(buffer) - bufferIndex
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}
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c.remainingPadding -= end
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bufferIndex += end
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}
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if bufferIndex == len(buffer) {
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break
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}
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}
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return buffers
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}
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