mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-04 12:09:19 +02:00
524 lines
16 KiB
Go
524 lines
16 KiB
Go
package encoding
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//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
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import (
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"bytes"
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"context"
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"crypto/rand"
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"fmt"
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"io"
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"math/big"
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"runtime"
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"syscall"
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"time"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/common/signal"
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"github.com/xtls/xray-core/features/stats"
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"github.com/xtls/xray-core/proxy/vless"
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"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/xtls/xray-core/transport/internet/tls"
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"github.com/xtls/xray-core/transport/internet/xtls"
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)
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const (
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Version = byte(0)
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)
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var tls13SupportedVersions = []byte{0x00, 0x2b, 0x00, 0x02, 0x03, 0x04}
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var tlsClientHandShakeStart = []byte{0x16, 0x03}
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var tlsServerHandShakeStart = []byte{0x16, 0x03, 0x03}
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var tlsApplicationDataStart = []byte{0x17, 0x03, 0x03}
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var addrParser = protocol.NewAddressParser(
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protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv4), net.AddressFamilyIPv4),
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protocol.AddressFamilyByte(byte(protocol.AddressTypeDomain), net.AddressFamilyDomain),
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protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv6), net.AddressFamilyIPv6),
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protocol.PortThenAddress(),
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)
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// EncodeRequestHeader writes encoded request header into the given writer.
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func EncodeRequestHeader(writer io.Writer, request *protocol.RequestHeader, requestAddons *Addons) error {
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buffer := buf.StackNew()
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defer buffer.Release()
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if err := buffer.WriteByte(request.Version); err != nil {
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return newError("failed to write request version").Base(err)
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}
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if _, err := buffer.Write(request.User.Account.(*vless.MemoryAccount).ID.Bytes()); err != nil {
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return newError("failed to write request user id").Base(err)
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}
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if err := EncodeHeaderAddons(&buffer, requestAddons); err != nil {
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return newError("failed to encode request header addons").Base(err)
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}
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if err := buffer.WriteByte(byte(request.Command)); err != nil {
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return newError("failed to write request command").Base(err)
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}
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if request.Command != protocol.RequestCommandMux {
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if err := addrParser.WriteAddressPort(&buffer, request.Address, request.Port); err != nil {
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return newError("failed to write request address and port").Base(err)
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}
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}
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if _, err := writer.Write(buffer.Bytes()); err != nil {
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return newError("failed to write request header").Base(err)
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}
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return nil
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}
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// DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream.
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func DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validator *vless.Validator) (*protocol.RequestHeader, *Addons, bool, error) {
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buffer := buf.StackNew()
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defer buffer.Release()
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request := new(protocol.RequestHeader)
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if isfb {
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request.Version = first.Byte(0)
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} else {
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if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
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return nil, nil, false, newError("failed to read request version").Base(err)
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}
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request.Version = buffer.Byte(0)
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}
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switch request.Version {
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case 0:
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var id [16]byte
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if isfb {
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copy(id[:], first.BytesRange(1, 17))
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} else {
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buffer.Clear()
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if _, err := buffer.ReadFullFrom(reader, 16); err != nil {
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return nil, nil, false, newError("failed to read request user id").Base(err)
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}
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copy(id[:], buffer.Bytes())
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}
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if request.User = validator.Get(id); request.User == nil {
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return nil, nil, isfb, newError("invalid request user id")
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}
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if isfb {
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first.Advance(17)
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}
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requestAddons, err := DecodeHeaderAddons(&buffer, reader)
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if err != nil {
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return nil, nil, false, newError("failed to decode request header addons").Base(err)
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}
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buffer.Clear()
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if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
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return nil, nil, false, newError("failed to read request command").Base(err)
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}
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request.Command = protocol.RequestCommand(buffer.Byte(0))
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switch request.Command {
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case protocol.RequestCommandMux:
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request.Address = net.DomainAddress("v1.mux.cool")
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request.Port = 0
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case protocol.RequestCommandTCP, protocol.RequestCommandUDP:
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if addr, port, err := addrParser.ReadAddressPort(&buffer, reader); err == nil {
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request.Address = addr
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request.Port = port
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}
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}
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if request.Address == nil {
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return nil, nil, false, newError("invalid request address")
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}
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return request, requestAddons, false, nil
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default:
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return nil, nil, isfb, newError("invalid request version")
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}
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}
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// EncodeResponseHeader writes encoded response header into the given writer.
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func EncodeResponseHeader(writer io.Writer, request *protocol.RequestHeader, responseAddons *Addons) error {
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buffer := buf.StackNew()
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defer buffer.Release()
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if err := buffer.WriteByte(request.Version); err != nil {
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return newError("failed to write response version").Base(err)
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}
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if err := EncodeHeaderAddons(&buffer, responseAddons); err != nil {
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return newError("failed to encode response header addons").Base(err)
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}
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if _, err := writer.Write(buffer.Bytes()); err != nil {
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return newError("failed to write response header").Base(err)
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}
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return nil
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}
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// DecodeResponseHeader decodes and returns (if successful) a ResponseHeader from an input stream.
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func DecodeResponseHeader(reader io.Reader, request *protocol.RequestHeader) (*Addons, error) {
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buffer := buf.StackNew()
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defer buffer.Release()
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if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
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return nil, newError("failed to read response version").Base(err)
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}
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if buffer.Byte(0) != request.Version {
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return nil, newError("unexpected response version. Expecting ", int(request.Version), " but actually ", int(buffer.Byte(0)))
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}
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responseAddons, err := DecodeHeaderAddons(&buffer, reader)
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if err != nil {
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return nil, newError("failed to decode response header addons").Base(err)
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}
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return responseAddons, nil
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}
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func ReadV(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn *xtls.Conn, rawConn syscall.RawConn, counter stats.Counter, ctx context.Context) error {
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err := func() error {
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var ct stats.Counter
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for {
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if conn.DirectIn {
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conn.DirectIn = false
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if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil {
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iConn := inbound.Conn
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statConn, ok := iConn.(*stat.CounterConnection)
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if ok {
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iConn = statConn.Connection
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}
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if xc, ok := iConn.(*xtls.Conn); ok {
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iConn = xc.NetConn()
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}
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if tc, ok := iConn.(*net.TCPConn); ok {
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if conn.SHOW {
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fmt.Println(conn.MARK, "Splice")
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}
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runtime.Gosched() // necessary
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w, err := tc.ReadFrom(conn.NetConn())
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if counter != nil {
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counter.Add(w)
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}
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if statConn != nil && statConn.WriteCounter != nil {
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statConn.WriteCounter.Add(w)
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}
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return err
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} else {
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panic("XTLS Splice: not TCP inbound")
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}
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}
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reader = buf.NewReadVReader(conn.NetConn(), rawConn, nil)
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ct = counter
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if conn.SHOW {
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fmt.Println(conn.MARK, "ReadV")
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}
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}
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buffer, err := reader.ReadMultiBuffer()
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if !buffer.IsEmpty() {
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if ct != nil {
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ct.Add(int64(buffer.Len()))
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}
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timer.Update()
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if werr := writer.WriteMultiBuffer(buffer); werr != nil {
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return werr
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}
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}
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if err != nil {
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return err
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}
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}
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}()
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if err != nil && errors.Cause(err) != io.EOF {
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return err
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}
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return nil
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}
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// XtlsRead filter and read xtls protocol
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func XtlsRead(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, rawConn syscall.RawConn, counter stats.Counter, ctx context.Context, userUUID []byte, numberOfPacketToFilter *int, isTLS13 *bool, isTLS12 *bool, isTLS *bool) error {
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err := func() error {
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var ct stats.Counter
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filterUUID := true
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shouldSwitchToDirectCopy := false
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var remainingContent int32 = -1
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var remainingPadding int32 = -1
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currentCommand := 0
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for {
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if shouldSwitchToDirectCopy {
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shouldSwitchToDirectCopy = false
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if runtime.GOOS == "linux" || runtime.GOOS == "android" {
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if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil {
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iConn := inbound.Conn
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statConn, ok := iConn.(*stat.CounterConnection)
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if ok {
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iConn = statConn.Connection
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}
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if xc, ok := iConn.(*tls.Conn); ok {
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iConn = xc.NetConn()
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}
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if tc, ok := iConn.(*net.TCPConn); ok {
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newError("XtlsRead splice").WriteToLog(session.ExportIDToError(ctx))
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runtime.Gosched() // necessary
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w, err := tc.ReadFrom(conn)
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if counter != nil {
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counter.Add(w)
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}
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if statConn != nil && statConn.WriteCounter != nil {
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statConn.WriteCounter.Add(w)
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}
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return err
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} else {
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panic("XTLS Splice: not TCP inbound")
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}
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} else {
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// panic("XTLS Splice: nil inbound or nil inbound.Conn")
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}
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}
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reader = buf.NewReadVReader(conn, rawConn, nil)
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ct = counter
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newError("XtlsRead readV").WriteToLog(session.ExportIDToError(ctx))
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}
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buffer, err := reader.ReadMultiBuffer()
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if !buffer.IsEmpty() {
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if filterUUID && (*isTLS || *numberOfPacketToFilter > 0) {
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buffer = XtlsUnpadding(ctx, buffer, userUUID, &remainingContent, &remainingPadding, ¤tCommand)
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if remainingContent == 0 && remainingPadding == 0 {
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if currentCommand == 1 {
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filterUUID = false
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} else if currentCommand == 2 {
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filterUUID = false
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shouldSwitchToDirectCopy = true
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} else if currentCommand != 0 {
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newError("XtlsRead unknown command ", currentCommand, buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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}
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if *numberOfPacketToFilter > 0 {
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XtlsFilterTls13(buffer, numberOfPacketToFilter, isTLS13, isTLS12, isTLS, ctx)
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}
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if ct != nil {
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ct.Add(int64(buffer.Len()))
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}
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timer.Update()
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if werr := writer.WriteMultiBuffer(buffer); werr != nil {
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return werr
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}
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}
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if err != nil {
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return err
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}
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}
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}()
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if err != nil && errors.Cause(err) != io.EOF {
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return err
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}
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return nil
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}
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// XtlsWrite filter and write xtls protocol
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func XtlsWrite(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, counter stats.Counter, ctx context.Context, userUUID *[]byte, numberOfPacketToFilter *int, isTLS13 *bool, isTLS12 *bool, isTLS *bool) error {
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err := func() error {
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var ct stats.Counter
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filterTlsApplicationData := true
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shouldSwitchToDirectCopy := false
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for {
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buffer, err := reader.ReadMultiBuffer()
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if !buffer.IsEmpty() {
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if *numberOfPacketToFilter > 0 {
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XtlsFilterTls13(buffer, numberOfPacketToFilter, isTLS13, isTLS12, isTLS, ctx)
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}
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if filterTlsApplicationData && *isTLS {
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var xtlsSpecIndex int
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for i, b := range buffer {
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if b.Len() >= 6 && bytes.Equal(tlsApplicationDataStart, b.BytesTo(3)) {
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var command byte = 0x01
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if *isTLS13 {
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shouldSwitchToDirectCopy = true
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xtlsSpecIndex = i
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command = 0x02
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}
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filterTlsApplicationData = false
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buffer[i] = XtlsPadding(b, command, userUUID, ctx)
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break
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} else if !*isTLS12 && !*isTLS13 && *numberOfPacketToFilter <= 0 {
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//maybe tls 1.1 or 1.0
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filterTlsApplicationData = false
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buffer[i] = XtlsPadding(b, 0x01, userUUID, ctx)
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break
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}
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buffer[i] = XtlsPadding(b, 0x00, userUUID, ctx)
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}
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if shouldSwitchToDirectCopy {
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encryptBuffer, directBuffer := buf.SplitMulti(buffer, xtlsSpecIndex+1)
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length := encryptBuffer.Len()
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if !encryptBuffer.IsEmpty() {
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timer.Update()
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if werr := writer.WriteMultiBuffer(encryptBuffer); werr != nil {
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return werr
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}
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}
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buffer = directBuffer
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writer = buf.NewWriter(conn)
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ct = counter
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newError("XtlsWrite writeV ", xtlsSpecIndex, " ", length, " ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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time.Sleep(5 * time.Millisecond) // for some device, the first xtls direct packet fails without this delay
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}
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}
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if !buffer.IsEmpty() {
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if ct != nil {
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ct.Add(int64(buffer.Len()))
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}
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timer.Update()
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if werr := writer.WriteMultiBuffer(buffer); werr != nil {
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return werr
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}
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}
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}
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if err != nil {
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return err
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}
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}
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}()
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if err != nil && errors.Cause(err) != io.EOF {
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return err
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}
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return nil
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}
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// XtlsFilterTls13 filter and recognize tls 1.3
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func XtlsFilterTls13(buffer buf.MultiBuffer, numberOfPacketToFilter *int, isTLS13 *bool, isTLS12 *bool, isTLS *bool, ctx context.Context) {
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for _, b := range buffer {
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*numberOfPacketToFilter--
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if b.Len() >= 6 {
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startsBytes := b.BytesTo(6)
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if bytes.Equal(tlsServerHandShakeStart, startsBytes[:3]) && startsBytes[5] == 0x02 {
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total := (int(startsBytes[3])<<8 | int(startsBytes[4])) + 5
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if b.Len() >= int32(total) {
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if bytes.Contains(b.BytesTo(int32(total)), tls13SupportedVersions) {
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*isTLS13 = true
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*isTLS = true
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newError("XtlsFilterTls13 found tls 1.3! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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} else {
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*isTLS12 = true
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*isTLS = true
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newError("XtlsFilterTls13 found tls 1.2! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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*numberOfPacketToFilter = 0
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return
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}
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} else if bytes.Equal(tlsClientHandShakeStart, startsBytes[:2]) && startsBytes[5] == 0x01 {
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*isTLS = true
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newError("XtlsFilterTls13 found tls client hello! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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if *numberOfPacketToFilter <= 0 {
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newError("XtlsFilterTls13 stop filtering", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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}
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// XtlsPadding add padding to eliminate length siganature during tls handshake
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func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, ctx context.Context) *buf.Buffer {
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var length int32 = 0
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if b.Len() < 900 {
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l, err := rand.Int(rand.Reader, big.NewInt(500))
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if err != nil {
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newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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length = int32(l.Int64()) + 900 - b.Len()
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}
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newbuffer := buf.New()
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if userUUID != nil {
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newbuffer.Write(*userUUID)
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*userUUID = nil
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}
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newbuffer.Write([]byte{command, byte(b.Len() >> 8), byte(b.Len()), byte(length >> 8), byte(length)})
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newbuffer.Write(b.Bytes())
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newbuffer.Extend(length)
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newError("XtlsPadding ", b.Len(), " ", length, " ", command).WriteToLog(session.ExportIDToError(ctx))
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b.Release()
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b = nil
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return newbuffer
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}
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// XtlsUnpadding remove padding and parse command
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func XtlsUnpadding(ctx context.Context, buffer buf.MultiBuffer, userUUID []byte, remainingContent *int32, remainingPadding *int32, currentCommand *int) buf.MultiBuffer {
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posindex := 0
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var posByte int32 = 0
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if *remainingContent == -1 && *remainingPadding == -1 {
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for i, b := range buffer {
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if b.Len() >= 21 && bytes.Equal(userUUID, b.BytesTo(16)) {
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posindex = i
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posByte = 16
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*remainingContent = 0
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*remainingPadding = 0
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break
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}
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}
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}
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if *remainingContent == -1 && *remainingPadding == -1 {
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return buffer
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}
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mb2 := make(buf.MultiBuffer, 0, len(buffer))
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for i := 0; i < posindex; i++ {
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newbuffer := buf.New()
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newbuffer.Write(buffer[i].Bytes())
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mb2 = append(mb2, newbuffer)
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}
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for i := posindex; i < len(buffer); i++ {
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b := buffer[i]
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for posByte < b.Len() {
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if *remainingContent <= 0 && *remainingPadding <= 0 {
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if *currentCommand == 1 {
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len := b.Len() - posByte
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newbuffer := buf.New()
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newbuffer.Write(b.BytesRange(posByte, posByte+len))
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mb2 = append(mb2, newbuffer)
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posByte += len
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} else {
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|
paddingInfo := b.BytesRange(posByte, posByte+5)
|
|
*currentCommand = int(paddingInfo[0])
|
|
*remainingContent = int32(paddingInfo[1])<<8 | int32(paddingInfo[2])
|
|
*remainingPadding = int32(paddingInfo[3])<<8 | int32(paddingInfo[4])
|
|
newError("Xtls Unpadding new block", i, " ", posByte, " content ", *remainingContent, " padding ", *remainingPadding, " ", paddingInfo[0]).WriteToLog(session.ExportIDToError(ctx))
|
|
posByte += 5
|
|
}
|
|
} else if *remainingContent > 0 {
|
|
len := *remainingContent
|
|
if b.Len() < posByte+*remainingContent {
|
|
len = b.Len() - posByte
|
|
}
|
|
newbuffer := buf.New()
|
|
newbuffer.Write(b.BytesRange(posByte, posByte+len))
|
|
mb2 = append(mb2, newbuffer)
|
|
*remainingContent -= len
|
|
posByte += len
|
|
} else { // remainingPadding > 0
|
|
len := *remainingPadding
|
|
if b.Len() < posByte+*remainingPadding {
|
|
len = b.Len() - posByte
|
|
}
|
|
*remainingPadding -= len
|
|
posByte += len
|
|
}
|
|
if posByte == b.Len() {
|
|
posByte = 0
|
|
break
|
|
}
|
|
}
|
|
}
|
|
buf.ReleaseMulti(buffer)
|
|
return mb2
|
|
}
|