mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-12-23 11:53:33 +02:00
576 lines
19 KiB
Go
576 lines
19 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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"io"
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"math/big"
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"runtime"
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"strconv"
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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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)
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const (
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Version = byte(0)
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)
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var (
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tls13SupportedVersions = []byte{0x00, 0x2b, 0x00, 0x02, 0x03, 0x04}
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tlsClientHandShakeStart = []byte{0x16, 0x03}
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tlsServerHandShakeStart = []byte{0x16, 0x03, 0x03}
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tlsApplicationDataStart = []byte{0x17, 0x03, 0x03}
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Tls13CipherSuiteDic = map[uint16]string{
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0x1301: "TLS_AES_128_GCM_SHA256",
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0x1302: "TLS_AES_256_GCM_SHA384",
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0x1303: "TLS_CHACHA20_POLY1305_SHA256",
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0x1304: "TLS_AES_128_CCM_SHA256",
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0x1305: "TLS_AES_128_CCM_8_SHA256",
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}
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)
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const (
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tlsHandshakeTypeClientHello byte = 0x01
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tlsHandshakeTypeServerHello byte = 0x02
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CommandPaddingContinue byte = 0x00
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CommandPaddingEnd byte = 0x01
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CommandPaddingDirect byte = 0x02
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)
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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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// 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,
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input *bytes.Reader, rawInput *bytes.Buffer,
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counter stats.Counter, ctx context.Context, userUUID []byte, numberOfPacketToFilter *int, enableXtls *bool,
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isTLS12orAbove *bool, isTLS *bool, cipher *uint16, remainingServerHello *int32,
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) error {
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err := func() error {
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var ct stats.Counter
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withinPaddingBuffers := 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 inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil && (runtime.GOOS == "linux" || runtime.GOOS == "android") {
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if _, ok := inbound.User.Account.(*vless.MemoryAccount); inbound.User.Account == nil || ok {
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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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}
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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 withinPaddingBuffers || *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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withinPaddingBuffers = false
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remainingContent = -1
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remainingPadding = -1 // set to initial state to parse the next padding
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} else if currentCommand == 2 {
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withinPaddingBuffers = false
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shouldSwitchToDirectCopy = true
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// XTLS Vision processes struct TLS Conn's input and rawInput
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if inputBuffer, err := buf.ReadFrom(input); err == nil {
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if !inputBuffer.IsEmpty() {
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buffer, _ = buf.MergeMulti(buffer, inputBuffer)
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}
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}
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if rawInputBuffer, err := buf.ReadFrom(rawInput); err == nil {
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if !rawInputBuffer.IsEmpty() {
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buffer, _ = buf.MergeMulti(buffer, rawInputBuffer)
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}
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}
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} else if currentCommand == 0 {
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withinPaddingBuffers = true
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} else {
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newError("XtlsRead unknown command ", currentCommand, buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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} else if remainingContent > 0 || remainingPadding > 0 {
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withinPaddingBuffers = true
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} else {
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withinPaddingBuffers = false
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}
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}
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if *numberOfPacketToFilter > 0 {
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XtlsFilterTls(buffer, numberOfPacketToFilter, enableXtls, isTLS12orAbove, isTLS, cipher, remainingServerHello, 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,
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ctx context.Context, numberOfPacketToFilter *int, enableXtls *bool, isTLS12orAbove *bool, isTLS *bool,
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cipher *uint16, remainingServerHello *int32,
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) error {
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err := func() error {
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var ct stats.Counter
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isPadding := 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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XtlsFilterTls(buffer, numberOfPacketToFilter, enableXtls, isTLS12orAbove, isTLS, cipher, remainingServerHello, ctx)
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}
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if isPadding {
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buffer = ReshapeMultiBuffer(ctx, buffer)
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var xtlsSpecIndex int
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for i, b := range buffer {
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if *isTLS && b.Len() >= 6 && bytes.Equal(tlsApplicationDataStart, b.BytesTo(3)) {
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var command byte = CommandPaddingEnd
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if *enableXtls {
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shouldSwitchToDirectCopy = true
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xtlsSpecIndex = i
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command = CommandPaddingDirect
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}
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isPadding = false
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buffer[i] = XtlsPadding(b, command, nil, *isTLS, ctx)
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break
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} else if !*isTLS12orAbove && *numberOfPacketToFilter <= 1 { // For compatibility with earlier vision receiver, we finish padding 1 packet early
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isPadding = false
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buffer[i] = XtlsPadding(b, CommandPaddingEnd, nil, *isTLS, ctx)
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break
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}
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buffer[i] = XtlsPadding(b, CommandPaddingContinue, nil, *isTLS, 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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// XtlsFilterTls filter and recognize tls 1.3 and other info
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func XtlsFilterTls(buffer buf.MultiBuffer, numberOfPacketToFilter *int, enableXtls *bool, isTLS12orAbove *bool, isTLS *bool,
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cipher *uint16, remainingServerHello *int32, ctx context.Context,
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) {
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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] == tlsHandshakeTypeServerHello {
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*remainingServerHello = (int32(startsBytes[3])<<8 | int32(startsBytes[4])) + 5
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*isTLS12orAbove = true
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*isTLS = true
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if b.Len() >= 79 && *remainingServerHello >= 79 {
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sessionIdLen := int32(b.Byte(43))
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cipherSuite := b.BytesRange(43+sessionIdLen+1, 43+sessionIdLen+3)
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*cipher = uint16(cipherSuite[0])<<8 | uint16(cipherSuite[1])
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} else {
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newError("XtlsFilterTls short server hello, tls 1.2 or older? ", b.Len(), " ", *remainingServerHello).WriteToLog(session.ExportIDToError(ctx))
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}
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} else if bytes.Equal(tlsClientHandShakeStart, startsBytes[:2]) && startsBytes[5] == tlsHandshakeTypeClientHello {
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*isTLS = true
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newError("XtlsFilterTls found tls client hello! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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if *remainingServerHello > 0 {
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end := *remainingServerHello
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if end > b.Len() {
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end = b.Len()
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}
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*remainingServerHello -= b.Len()
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if bytes.Contains(b.BytesTo(end), tls13SupportedVersions) {
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v, ok := Tls13CipherSuiteDic[*cipher]
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if !ok {
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v = "Old cipher: " + strconv.FormatUint(uint64(*cipher), 16)
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} else if v != "TLS_AES_128_CCM_8_SHA256" {
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*enableXtls = true
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}
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newError("XtlsFilterTls found tls 1.3! ", b.Len(), " ", v).WriteToLog(session.ExportIDToError(ctx))
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*numberOfPacketToFilter = 0
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return
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} else if *remainingServerHello <= 0 {
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newError("XtlsFilterTls found tls 1.2! ", b.Len()).WriteToLog(session.ExportIDToError(ctx))
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*numberOfPacketToFilter = 0
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return
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}
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newError("XtlsFilterTls inconclusive server hello ", b.Len(), " ", *remainingServerHello).WriteToLog(session.ExportIDToError(ctx))
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}
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if *numberOfPacketToFilter <= 0 {
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newError("XtlsFilterTls stop filtering", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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}
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// ReshapeMultiBuffer prepare multi buffer for padding stucture (max 21 bytes)
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func ReshapeMultiBuffer(ctx context.Context, buffer buf.MultiBuffer) buf.MultiBuffer {
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needReshape := 0
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for _, b := range buffer {
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if b.Len() >= buf.Size-21 {
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needReshape += 1
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}
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}
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if needReshape == 0 {
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return buffer
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}
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mb2 := make(buf.MultiBuffer, 0, len(buffer)+needReshape)
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toPrint := ""
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for i, buffer1 := range buffer {
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if buffer1.Len() >= buf.Size-21 {
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index := int32(bytes.LastIndex(buffer1.Bytes(), tlsApplicationDataStart))
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if index <= 0 || index > buf.Size-21 {
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index = buf.Size / 2
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}
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buffer2 := buf.New()
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buffer2.Write(buffer1.BytesFrom(index))
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buffer1.Resize(0, index)
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mb2 = append(mb2, buffer1, buffer2)
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toPrint += " " + strconv.Itoa(int(buffer1.Len())) + " " + strconv.Itoa(int(buffer2.Len()))
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} else {
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mb2 = append(mb2, buffer1)
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toPrint += " " + strconv.Itoa(int(buffer1.Len()))
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}
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buffer[i] = nil
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}
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buffer = buffer[:0]
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newError("ReshapeMultiBuffer ", toPrint).WriteToLog(session.ExportIDToError(ctx))
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return mb2
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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, longPadding bool, ctx context.Context) *buf.Buffer {
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var contentLen int32 = 0
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var paddingLen int32 = 0
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if b != nil {
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contentLen = b.Len()
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}
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if contentLen < 900 && longPadding {
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l, err := rand.Int(rand.Reader, big.NewInt(500))
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if err != nil {
|
|
newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
paddingLen = int32(l.Int64()) + 900 - contentLen
|
|
} else {
|
|
l, err := rand.Int(rand.Reader, big.NewInt(256))
|
|
if err != nil {
|
|
newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
paddingLen = int32(l.Int64())
|
|
}
|
|
if paddingLen > buf.Size-21-contentLen {
|
|
paddingLen = buf.Size - 21 - contentLen
|
|
}
|
|
newbuffer := buf.New()
|
|
if userUUID != nil {
|
|
newbuffer.Write(*userUUID)
|
|
*userUUID = nil
|
|
}
|
|
newbuffer.Write([]byte{command, byte(contentLen >> 8), byte(contentLen), byte(paddingLen >> 8), byte(paddingLen)})
|
|
if b != nil {
|
|
newbuffer.Write(b.Bytes())
|
|
b.Release()
|
|
b = nil
|
|
}
|
|
newbuffer.Extend(paddingLen)
|
|
newError("XtlsPadding ", contentLen, " ", paddingLen, " ", command).WriteToLog(session.ExportIDToError(ctx))
|
|
return newbuffer
|
|
}
|
|
|
|
// XtlsUnpadding remove padding and parse command
|
|
func XtlsUnpadding(ctx context.Context, buffer buf.MultiBuffer, userUUID []byte, remainingContent *int32, remainingPadding *int32, currentCommand *int) buf.MultiBuffer {
|
|
posindex := 0
|
|
var posByte int32 = 0
|
|
if *remainingContent == -1 && *remainingPadding == -1 {
|
|
for i, b := range buffer {
|
|
if b.Len() >= 21 && bytes.Equal(userUUID, b.BytesTo(16)) {
|
|
posindex = i
|
|
posByte = 16
|
|
*remainingContent = 0
|
|
*remainingPadding = 0
|
|
*currentCommand = 0
|
|
break
|
|
}
|
|
}
|
|
}
|
|
if *remainingContent == -1 && *remainingPadding == -1 {
|
|
return buffer
|
|
}
|
|
mb2 := make(buf.MultiBuffer, 0, len(buffer))
|
|
for i := 0; i < posindex; i++ {
|
|
newbuffer := buf.New()
|
|
newbuffer.Write(buffer[i].Bytes())
|
|
mb2 = append(mb2, newbuffer)
|
|
}
|
|
for i := posindex; i < len(buffer); i++ {
|
|
b := buffer[i]
|
|
for posByte < b.Len() {
|
|
if *remainingContent <= 0 && *remainingPadding <= 0 {
|
|
if *currentCommand == 1 { // possible buffer after padding, no need to worry about xtls (command 2)
|
|
len := b.Len() - posByte
|
|
newbuffer := buf.New()
|
|
newbuffer.Write(b.BytesRange(posByte, posByte+len))
|
|
mb2 = append(mb2, newbuffer)
|
|
posByte += len
|
|
} else {
|
|
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
|
|
}
|