mirror of https://github.com/v2ray/v2ray-core
167 lines
5.0 KiB
Go
167 lines
5.0 KiB
Go
package encoding
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import (
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"crypto/md5"
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"errors"
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"hash/fnv"
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"io"
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"v2ray.com/core/common/crypto"
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"v2ray.com/core/common/log"
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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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"v2ray.com/core/proxy/vmess"
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)
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type ServerSession struct {
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userValidator protocol.UserValidator
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requestBodyKey []byte
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requestBodyIV []byte
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responseBodyKey []byte
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responseBodyIV []byte
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responseHeader byte
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responseWriter io.Writer
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}
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// NewServerSession creates a new ServerSession, using the given UserValidator.
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// The ServerSession instance doesn't take ownership of the validator.
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func NewServerSession(validator protocol.UserValidator) *ServerSession {
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return &ServerSession{
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userValidator: validator,
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}
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}
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// Release implements common.Releaseable.
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func (v *ServerSession) Release() {
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v.userValidator = nil
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v.requestBodyIV = nil
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v.requestBodyKey = nil
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v.responseBodyIV = nil
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v.responseBodyKey = nil
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v.responseWriter = nil
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}
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func (v *ServerSession) DecodeRequestHeader(reader io.Reader) (*protocol.RequestHeader, error) {
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buffer := make([]byte, 512)
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_, err := io.ReadFull(reader, buffer[:protocol.IDBytesLen])
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if err != nil {
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log.Info("Raw: Failed to read request header: ", err)
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return nil, io.EOF
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}
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user, timestamp, valid := v.userValidator.Get(buffer[:protocol.IDBytesLen])
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if !valid {
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return nil, protocol.ErrInvalidUser
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}
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timestampHash := md5.New()
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timestampHash.Write(hashTimestamp(timestamp))
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iv := timestampHash.Sum(nil)
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account, err := user.GetTypedAccount()
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if err != nil {
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return nil, errors.New("VMess|Server: Failed to get user account: " + err.Error())
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}
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aesStream := crypto.NewAesDecryptionStream(account.(*vmess.InternalAccount).ID.CmdKey(), iv)
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decryptor := crypto.NewCryptionReader(aesStream, reader)
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nBytes, err := io.ReadFull(decryptor, buffer[:41])
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if err != nil {
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return nil, errors.New("VMess|Server: Failed to read request header: " + err.Error())
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}
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bufferLen := nBytes
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request := &protocol.RequestHeader{
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User: user,
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Version: buffer[0],
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}
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if request.Version != Version {
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log.Info("VMess|Server: Invalid protocol version ", request.Version)
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return nil, protocol.ErrInvalidVersion
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}
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v.requestBodyIV = append([]byte(nil), buffer[1:17]...) // 16 bytes
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v.requestBodyKey = append([]byte(nil), buffer[17:33]...) // 16 bytes
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v.responseHeader = buffer[33] // 1 byte
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request.Option = protocol.RequestOption(buffer[34]) // 1 byte + 2 bytes reserved
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request.Command = protocol.RequestCommand(buffer[37])
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request.Port = v2net.PortFromBytes(buffer[38:40])
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switch buffer[40] {
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case AddrTypeIPv4:
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nBytes, err = io.ReadFull(decryptor, buffer[41:45]) // 4 bytes
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bufferLen += 4
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if err != nil {
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return nil, errors.New("VMess|Server: Failed to read IPv4: " + err.Error())
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}
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request.Address = v2net.IPAddress(buffer[41:45])
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case AddrTypeIPv6:
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nBytes, err = io.ReadFull(decryptor, buffer[41:57]) // 16 bytes
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bufferLen += 16
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if err != nil {
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return nil, errors.New("VMess|Server: Failed to read IPv6 address: " + err.Error())
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}
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request.Address = v2net.IPAddress(buffer[41:57])
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case AddrTypeDomain:
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_, err = io.ReadFull(decryptor, buffer[41:42])
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if err != nil {
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return nil, errors.New("VMess:Server: Failed to read domain: " + err.Error())
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}
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domainLength := int(buffer[41])
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if domainLength == 0 {
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return nil, errors.New("VMess|Server: Zero domain length.")
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}
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nBytes, err = io.ReadFull(decryptor, buffer[42:42+domainLength])
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if err != nil {
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return nil, errors.New("VMess|Server: Failed to read domain: " + err.Error())
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}
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bufferLen += 1 + domainLength
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request.Address = v2net.DomainAddress(string(buffer[42 : 42+domainLength]))
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}
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nBytes, err = io.ReadFull(decryptor, buffer[bufferLen:bufferLen+4])
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if err != nil {
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return nil, errors.New("VMess|Server: Failed to read checksum: " + err.Error())
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}
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fnv1a := fnv.New32a()
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fnv1a.Write(buffer[:bufferLen])
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actualHash := fnv1a.Sum32()
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expectedHash := serial.BytesToUint32(buffer[bufferLen : bufferLen+4])
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if actualHash != expectedHash {
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return nil, errors.New("VMess|Server: Invalid auth.")
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}
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return request, nil
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}
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func (v *ServerSession) DecodeRequestBody(reader io.Reader) io.Reader {
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aesStream := crypto.NewAesDecryptionStream(v.requestBodyKey, v.requestBodyIV)
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return crypto.NewCryptionReader(aesStream, reader)
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}
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func (v *ServerSession) EncodeResponseHeader(header *protocol.ResponseHeader, writer io.Writer) {
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responseBodyKey := md5.Sum(v.requestBodyKey)
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responseBodyIV := md5.Sum(v.requestBodyIV)
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v.responseBodyKey = responseBodyKey[:]
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v.responseBodyIV = responseBodyIV[:]
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aesStream := crypto.NewAesEncryptionStream(v.responseBodyKey, v.responseBodyIV)
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encryptionWriter := crypto.NewCryptionWriter(aesStream, writer)
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v.responseWriter = encryptionWriter
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encryptionWriter.Write([]byte{v.responseHeader, byte(header.Option)})
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err := MarshalCommand(header.Command, encryptionWriter)
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if err != nil {
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encryptionWriter.Write([]byte{0x00, 0x00})
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}
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}
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func (v *ServerSession) EncodeResponseBody(writer io.Writer) io.Writer {
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return v.responseWriter
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}
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