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402 lines
12 KiB
402 lines
12 KiB
package shadowsocks
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import (
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"bytes"
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"crypto/rand"
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"io"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/crypto"
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"v2ray.com/core/common/errors"
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v2net "v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/common/serial"
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)
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const (
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Version = 1
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RequestOptionOneTimeAuth = protocol.RequestOption(101)
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AddrTypeIPv4 = 1
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AddrTypeIPv6 = 4
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AddrTypeDomain = 3
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)
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func ReadTCPSession(user *protocol.User, reader io.Reader) (*protocol.RequestHeader, buf.Reader, error) {
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rawAccount, err := user.GetTypedAccount()
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to parse account.")
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}
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account := rawAccount.(*ShadowsocksAccount)
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buffer := buf.NewLocal(512)
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defer buffer.Release()
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ivLen := account.Cipher.IVSize()
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err = buffer.AppendSupplier(buf.ReadFullFrom(reader, ivLen))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IV.")
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}
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iv := append([]byte(nil), buffer.BytesTo(ivLen)...)
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stream, err := account.Cipher.NewDecodingStream(account.Key, iv)
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to initialize decoding stream.")
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}
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reader = crypto.NewCryptionReader(stream, reader)
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authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
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request := &protocol.RequestHeader{
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Version: Version,
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User: user,
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Command: protocol.RequestCommandTCP,
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}
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buffer.Clear()
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err = buffer.AppendSupplier(buf.ReadFullFrom(reader, 1))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read address type.")
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}
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addrType := (buffer.Byte(0) & 0x0F)
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if (buffer.Byte(0) & 0x10) == 0x10 {
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request.Option |= RequestOptionOneTimeAuth
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}
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if request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Disabled {
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return nil, nil, errors.New("Shadowsocks|TCP: Rejecting connection with OTA enabled, while server disables OTA.")
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}
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if !request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Enabled {
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return nil, nil, errors.New("Shadowsocks|TCP: Rejecting connection with OTA disabled, while server enables OTA.")
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}
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switch addrType {
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case AddrTypeIPv4:
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err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 4))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IPv4 address.")
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}
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request.Address = v2net.IPAddress(buffer.BytesFrom(-4))
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case AddrTypeIPv6:
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err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 16))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IPv6 address.")
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}
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request.Address = v2net.IPAddress(buffer.BytesFrom(-16))
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case AddrTypeDomain:
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err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 1))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read domain lenth.")
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}
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domainLength := int(buffer.BytesFrom(-1)[0])
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err = buffer.AppendSupplier(buf.ReadFullFrom(reader, domainLength))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read domain.")
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}
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request.Address = v2net.DomainAddress(string(buffer.BytesFrom(-domainLength)))
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default:
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// Check address validity after OTA verification.
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}
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err = buffer.AppendSupplier(buf.ReadFullFrom(reader, 2))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read port.")
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}
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request.Port = v2net.PortFromBytes(buffer.BytesFrom(-2))
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if request.Option.Has(RequestOptionOneTimeAuth) {
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actualAuth := make([]byte, AuthSize)
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authenticator.Authenticate(buffer.Bytes())(actualAuth)
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err := buffer.AppendSupplier(buf.ReadFullFrom(reader, AuthSize))
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read OTA.")
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}
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if !bytes.Equal(actualAuth, buffer.BytesFrom(-AuthSize)) {
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return nil, nil, errors.New("Shadowsocks|TCP: Invalid OTA")
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}
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}
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if request.Address == nil {
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return nil, nil, errors.New("Shadowsocks|TCP: Invalid remote address.")
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}
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var chunkReader buf.Reader
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if request.Option.Has(RequestOptionOneTimeAuth) {
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chunkReader = NewChunkReader(reader, NewAuthenticator(ChunkKeyGenerator(iv)))
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} else {
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chunkReader = buf.NewReader(reader)
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}
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return request, chunkReader, nil
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}
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func WriteTCPRequest(request *protocol.RequestHeader, writer io.Writer) (buf.Writer, error) {
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user := request.User
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rawAccount, err := user.GetTypedAccount()
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to parse account.")
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}
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account := rawAccount.(*ShadowsocksAccount)
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iv := make([]byte, account.Cipher.IVSize())
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rand.Read(iv)
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_, err = writer.Write(iv)
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to write IV.")
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}
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stream, err := account.Cipher.NewEncodingStream(account.Key, iv)
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to create encoding stream.")
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}
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writer = crypto.NewCryptionWriter(stream, writer)
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header := buf.NewLocal(512)
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switch request.Address.Family() {
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case v2net.AddressFamilyIPv4:
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header.AppendBytes(AddrTypeIPv4)
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header.Append([]byte(request.Address.IP()))
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case v2net.AddressFamilyIPv6:
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header.AppendBytes(AddrTypeIPv6)
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header.Append([]byte(request.Address.IP()))
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case v2net.AddressFamilyDomain:
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header.AppendBytes(AddrTypeDomain, byte(len(request.Address.Domain())))
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header.Append([]byte(request.Address.Domain()))
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default:
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return nil, errors.New("Shadowsocks|TCP: Unsupported address type: ", request.Address.Family())
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}
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header.AppendSupplier(serial.WriteUint16(uint16(request.Port)))
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if request.Option.Has(RequestOptionOneTimeAuth) {
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header.SetByte(0, header.Byte(0)|0x10)
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authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
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header.AppendSupplier(authenticator.Authenticate(header.Bytes()))
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}
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_, err = writer.Write(header.Bytes())
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to write header.")
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}
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var chunkWriter buf.Writer
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if request.Option.Has(RequestOptionOneTimeAuth) {
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chunkWriter = NewChunkWriter(writer, NewAuthenticator(ChunkKeyGenerator(iv)))
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} else {
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chunkWriter = buf.NewWriter(writer)
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}
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return chunkWriter, nil
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}
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func ReadTCPResponse(user *protocol.User, reader io.Reader) (buf.Reader, error) {
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rawAccount, err := user.GetTypedAccount()
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to parse account.")
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}
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account := rawAccount.(*ShadowsocksAccount)
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iv := make([]byte, account.Cipher.IVSize())
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_, err = io.ReadFull(reader, iv)
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to read IV.")
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}
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stream, err := account.Cipher.NewDecodingStream(account.Key, iv)
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to initialize decoding stream.")
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}
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return buf.NewReader(crypto.NewCryptionReader(stream, reader)), nil
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}
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func WriteTCPResponse(request *protocol.RequestHeader, writer io.Writer) (buf.Writer, error) {
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user := request.User
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rawAccount, err := user.GetTypedAccount()
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to parse account.")
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}
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account := rawAccount.(*ShadowsocksAccount)
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iv := make([]byte, account.Cipher.IVSize())
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rand.Read(iv)
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_, err = writer.Write(iv)
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to write IV.")
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}
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stream, err := account.Cipher.NewEncodingStream(account.Key, iv)
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to create encoding stream.")
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}
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return buf.NewWriter(crypto.NewCryptionWriter(stream, writer)), nil
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}
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func EncodeUDPPacket(request *protocol.RequestHeader, payload *buf.Buffer) (*buf.Buffer, error) {
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user := request.User
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rawAccount, err := user.GetTypedAccount()
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|UDP: Failed to parse account.")
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}
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account := rawAccount.(*ShadowsocksAccount)
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buffer := buf.NewSmall()
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ivLen := account.Cipher.IVSize()
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buffer.AppendSupplier(buf.ReadFullFrom(rand.Reader, ivLen))
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iv := buffer.Bytes()
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switch request.Address.Family() {
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case v2net.AddressFamilyIPv4:
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buffer.AppendBytes(AddrTypeIPv4)
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buffer.Append([]byte(request.Address.IP()))
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case v2net.AddressFamilyIPv6:
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buffer.AppendBytes(AddrTypeIPv6)
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buffer.Append([]byte(request.Address.IP()))
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case v2net.AddressFamilyDomain:
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buffer.AppendBytes(AddrTypeDomain, byte(len(request.Address.Domain())))
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buffer.Append([]byte(request.Address.Domain()))
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default:
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return nil, errors.New("Shadowsocks|UDP: Unsupported address type: ", request.Address.Family())
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}
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buffer.AppendSupplier(serial.WriteUint16(uint16(request.Port)))
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buffer.Append(payload.Bytes())
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if request.Option.Has(RequestOptionOneTimeAuth) {
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authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
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buffer.SetByte(ivLen, buffer.Byte(ivLen)|0x10)
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buffer.AppendSupplier(authenticator.Authenticate(buffer.BytesFrom(ivLen)))
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}
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stream, err := account.Cipher.NewEncodingStream(account.Key, iv)
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if err != nil {
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return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to create encoding stream.")
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}
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stream.XORKeyStream(buffer.BytesFrom(ivLen), buffer.BytesFrom(ivLen))
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return buffer, nil
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}
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func DecodeUDPPacket(user *protocol.User, payload *buf.Buffer) (*protocol.RequestHeader, *buf.Buffer, error) {
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rawAccount, err := user.GetTypedAccount()
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|UDP: Failed to parse account.")
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}
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account := rawAccount.(*ShadowsocksAccount)
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ivLen := account.Cipher.IVSize()
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iv := payload.BytesTo(ivLen)
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payload.SliceFrom(ivLen)
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stream, err := account.Cipher.NewDecodingStream(account.Key, iv)
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if err != nil {
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return nil, nil, errors.Base(err).Message("Shadowsocks|UDP: Failed to initialize decoding stream.")
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}
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stream.XORKeyStream(payload.Bytes(), payload.Bytes())
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authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
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request := &protocol.RequestHeader{
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Version: Version,
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User: user,
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Command: protocol.RequestCommandUDP,
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}
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addrType := (payload.Byte(0) & 0x0F)
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if (payload.Byte(0) & 0x10) == 0x10 {
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request.Option |= RequestOptionOneTimeAuth
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}
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if request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Disabled {
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return nil, nil, errors.New("Shadowsocks|UDP: Rejecting packet with OTA enabled, while server disables OTA.")
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}
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if !request.Option.Has(RequestOptionOneTimeAuth) && account.OneTimeAuth == Account_Enabled {
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return nil, nil, errors.New("Shadowsocks|UDP: Rejecting packet with OTA disabled, while server enables OTA.")
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}
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if request.Option.Has(RequestOptionOneTimeAuth) {
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payloadLen := payload.Len() - AuthSize
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authBytes := payload.BytesFrom(payloadLen)
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actualAuth := make([]byte, AuthSize)
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authenticator.Authenticate(payload.BytesTo(payloadLen))(actualAuth)
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if !bytes.Equal(actualAuth, authBytes) {
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return nil, nil, errors.New("Shadowsocks|UDP: Invalid OTA.")
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}
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payload.Slice(0, payloadLen)
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}
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payload.SliceFrom(1)
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switch addrType {
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case AddrTypeIPv4:
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request.Address = v2net.IPAddress(payload.BytesTo(4))
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payload.SliceFrom(4)
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case AddrTypeIPv6:
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request.Address = v2net.IPAddress(payload.BytesTo(16))
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payload.SliceFrom(16)
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case AddrTypeDomain:
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domainLength := int(payload.Byte(0))
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request.Address = v2net.DomainAddress(string(payload.BytesRange(1, 1+domainLength)))
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payload.SliceFrom(1 + domainLength)
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default:
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return nil, nil, errors.New("Shadowsocks|UDP: Unknown address type: ", addrType)
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}
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request.Port = v2net.PortFromBytes(payload.BytesTo(2))
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payload.SliceFrom(2)
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return request, payload, nil
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}
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type UDPReader struct {
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Reader io.Reader
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User *protocol.User
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}
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func (v *UDPReader) Read() (*buf.Buffer, error) {
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buffer := buf.NewSmall()
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err := buffer.AppendSupplier(buf.ReadFrom(v.Reader))
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if err != nil {
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buffer.Release()
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return nil, err
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}
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_, payload, err := DecodeUDPPacket(v.User, buffer)
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if err != nil {
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buffer.Release()
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return nil, err
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}
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return payload, nil
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}
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func (v *UDPReader) Release() {
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}
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type UDPWriter struct {
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Writer io.Writer
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Request *protocol.RequestHeader
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}
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func (v *UDPWriter) Write(buffer *buf.Buffer) error {
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payload, err := EncodeUDPPacket(v.Request, buffer)
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if err != nil {
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return err
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}
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_, err = v.Writer.Write(payload.Bytes())
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payload.Release()
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return err
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}
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func (v *UDPWriter) Release() {
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}
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