func (this *AuthChunkReader) Read() (*alloc.Buffer, error) {
buffer := alloc.NewBuffer()
if _, err := io.ReadFull(this.reader, buffer.Value[:2]); err != nil {
buffer.Release()
return nil, err
}
length := serial.BytesLiteral(buffer.Value[:2]).Uint16Value()
if _, err := io.ReadFull(this.reader, buffer.Value[:length]); err != nil {
buffer.Release()
return nil, err
}
buffer.Slice(0, int(length))
fnvHash := fnv.New32a()
fnvHash.Write(buffer.Value[4:])
expAuth := serial.BytesLiteral(fnvHash.Sum(nil))
actualAuth := serial.BytesLiteral(buffer.Value[:4])
if !actualAuth.Equals(expAuth) {
buffer.Release()
return nil, transport.ErrorCorruptedPacket
}
buffer.SliceFrom(4)
return buffer, nil
}
func (this *ChunkReader) Read() (*alloc.Buffer, error) {
buffer := alloc.NewLargeBuffer()
if _, err := io.ReadFull(this.reader, buffer.Value[:2]); err != nil {
buffer.Release()
return nil, err
}
// There is a potential buffer overflow here. Large buffer is 64K bytes,
// while uin16 + 10 will be more than that
length := serial.BytesLiteral(buffer.Value[:2]).Uint16Value() + AuthSize
if _, err := io.ReadFull(this.reader, buffer.Value[:length]); err != nil {
buffer.Release()
return nil, err
}
buffer.Slice(0, int(length))
authBytes := buffer.Value[:AuthSize]
payload := buffer.Value[AuthSize:]
actualAuthBytes := this.auth.Authenticate(nil, payload)
if !serial.BytesLiteral(authBytes).Equals(serial.BytesLiteral(actualAuthBytes)) {
buffer.Release()
log.Debug("AuthenticationReader: Unexpected auth: ", authBytes)
return nil, transport.ErrorCorruptedPacket
}
buffer.Value = payload
return buffer, nil
}
func (this *VMessOutboundHandler) handleCommand(dest v2net.Destination, cmdId byte, data []byte) {
if len(data) < 4 {
return
}
fnv1hash := fnv.New32a()
fnv1hash.Write(data[4:])
actualHashValue := fnv1hash.Sum32()
expectedHashValue := serial.BytesLiteral(data[:4]).Uint32Value()
if actualHashValue != expectedHashValue {
return
}
data = data[4:]
cmd, err := command.CreateResponseCommand(cmdId)
if err != nil {
log.Warning("VMessOut: Unknown response command (", cmdId, "): ", err)
return
}
if err := cmd.Unmarshal(data); err != nil {
log.Warning("VMessOut: Failed to parse response command: ", err)
return
}
switch typedCommand := cmd.(type) {
case *command.SwitchAccount:
if typedCommand.Host == nil {
typedCommand.Host = dest.Address()
}
this.handleSwitchAccount(typedCommand)
default:
}
}
func (this *SwitchAccount) Unmarshal(data []byte) error {
lenHost := int(data[0])
if len(data) < lenHost+1 {
return transport.CorruptedPacket
}
this.Host = v2net.ParseAddress(string(data[1 : 1+lenHost]))
portStart := 1 + lenHost
if len(data) < portStart+2 {
return transport.CorruptedPacket
}
this.Port = v2net.PortFromBytes(data[portStart : portStart+2])
idStart := portStart + 2
if len(data) < idStart+16 {
return transport.CorruptedPacket
}
this.ID, _ = uuid.ParseBytes(data[idStart : idStart+16])
alterIdStart := idStart + 16
if len(data) < alterIdStart+2 {
return transport.CorruptedPacket
}
this.AlterIds = serial.ParseUint16(data[alterIdStart : alterIdStart+2])
timeStart := alterIdStart + 2
if len(data) < timeStart+8 {
return transport.CorruptedPacket
}
this.ValidUntil = time.Unix(serial.BytesLiteral(data[timeStart:timeStart+8]).Int64Value(), 0)
return nil
}
func (this *SwitchAccount) Unmarshal(data []byte) error {
if len(data) != 24 {
return transport.CorruptedPacket
}
this.ID, _ = uuid.ParseBytes(data[0:16])
this.ValidUntil = time.Unix(serial.BytesLiteral(data[16:24]).Int64Value(), 0)
return nil
}
// IPAddress creates an Address with given IP and port.
func IPAddress(ip []byte) Address {
switch len(ip) {
case net.IPv4len:
var addr IPv4Address = [4]byte{ip[0], ip[1], ip[2], ip[3]}
return &addr
case net.IPv6len:
if serial.BytesLiteral(ip[0:10]).All(0) && serial.BytesLiteral(ip[10:12]).All(0xff) {
return IPAddress(ip[12:16])
}
var addr IPv6Address = [16]byte{
ip[0], ip[1], ip[2], ip[3],
ip[4], ip[5], ip[6], ip[7],
ip[8], ip[9], ip[10], ip[11],
ip[12], ip[13], ip[14], ip[15],
}
return &addr
default:
log.Error("Invalid IP format: ", ip)
return nil
}
}
func (this *PortRange) UnmarshalJSON(data []byte) error {
var maybeint int
err := json.Unmarshal(data, &maybeint)
if err == nil {
if maybeint <= 0 || maybeint >= 65535 {
log.Error("Invalid port [", serial.BytesLiteral(data), "]")
return ErrorInvalidPortRange
}
this.From = Port(maybeint)
this.To = Port(maybeint)
return nil
}
var maybestring string
err = json.Unmarshal(data, &maybestring)
if err == nil {
pair := strings.SplitN(maybestring, "-", 2)
if len(pair) == 1 {
value, err := strconv.Atoi(pair[0])
if err != nil || value <= 0 || value >= 65535 {
log.Error("Invalid from port ", pair[0])
return ErrorInvalidPortRange
}
this.From = Port(value)
this.To = Port(value)
return nil
} else if len(pair) == 2 {
from, err := strconv.Atoi(pair[0])
if err != nil || from <= 0 || from >= 65535 {
log.Error("Invalid from port ", pair[0])
return ErrorInvalidPortRange
}
this.From = Port(from)
to, err := strconv.Atoi(pair[1])
if err != nil || to <= 0 || to >= 65535 {
log.Error("Invalid to port ", pair[1])
return ErrorInvalidPortRange
}
this.To = Port(to)
if this.From > this.To {
log.Error("Invalid port range ", this.From, " -> ", this.To)
return ErrorInvalidPortRange
}
return nil
}
}
return ErrorInvalidPortRange
}
func (this *HttpProxyServer) handlePlainHTTP(request *http.Request, dest v2net.Destination, reader *bufio.Reader, writer io.Writer) {
if len(request.URL.Host) <= 0 {
hdr := http.Header(make(map[string][]string))
hdr.Set("Connection", "close")
response := &http.Response{
Status: "400 Bad Request",
StatusCode: 400,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: hdr,
Body: nil,
ContentLength: 0,
Close: false,
}
buffer := alloc.NewSmallBuffer().Clear()
response.Write(buffer)
writer.Write(buffer.Value)
buffer.Release()
return
}
request.Host = request.URL.Host
stripHopByHopHeaders(request)
requestBuffer := alloc.NewBuffer().Clear() // Don't release this buffer as it is passed into a Packet.
request.Write(requestBuffer)
log.Debug("Request to remote:\n", serial.BytesLiteral(requestBuffer.Value))
packet := v2net.NewPacket(dest, requestBuffer, true)
ray := this.packetDispatcher.DispatchToOutbound(packet)
defer close(ray.InboundInput())
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
responseReader := bufio.NewReader(NewChanReader(ray.InboundOutput()))
response, err := http.ReadResponse(responseReader, request)
if err != nil {
return
}
responseBuffer := alloc.NewBuffer().Clear()
defer responseBuffer.Release()
response.Write(responseBuffer)
writer.Write(responseBuffer.Value)
response.Body.Close()
}()
wg.Wait()
}
func (this *SwitchAccount) Unmarshal(data []byte) error {
if len(data) == 0 {
return transport.ErrorCorruptedPacket
}
lenHost := int(data[0])
if len(data) < lenHost+1 {
return transport.ErrorCorruptedPacket
}
if lenHost > 0 {
this.Host = v2net.ParseAddress(string(data[1 : 1+lenHost]))
}
portStart := 1 + lenHost
if len(data) < portStart+2 {
return transport.ErrorCorruptedPacket
}
this.Port = v2net.PortFromBytes(data[portStart : portStart+2])
idStart := portStart + 2
if len(data) < idStart+16 {
return transport.ErrorCorruptedPacket
}
this.ID, _ = uuid.ParseBytes(data[idStart : idStart+16])
alterIdStart := idStart + 16
if len(data) < alterIdStart+2 {
return transport.ErrorCorruptedPacket
}
this.AlterIds = serial.BytesLiteral(data[alterIdStart : alterIdStart+2]).Uint16()
levelStart := alterIdStart + 2
if len(data) < levelStart+1 {
return transport.ErrorCorruptedPacket
}
this.Level = vmess.UserLevel(data[levelStart])
timeStart := levelStart + 1
if len(data) < timeStart {
return transport.ErrorCorruptedPacket
}
this.ValidMin = data[timeStart]
return nil
}
func ReadRequest(reader io.Reader, auth *Authenticator, udp bool) (*Request, error) {
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
_, err := io.ReadFull(reader, buffer.Value[:1])
if err != nil {
log.Error("Shadowsocks: Failed to read address type: ", err)
return nil, transport.ErrorCorruptedPacket
}
lenBuffer := 1
request := new(Request)
addrType := (buffer.Value[0] & 0x0F)
if (buffer.Value[0] & 0x10) == 0x10 {
request.OTA = true
}
switch addrType {
case AddrTypeIPv4:
_, err := io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+4])
if err != nil {
log.Error("Shadowsocks: Failed to read IPv4 address: ", err)
return nil, transport.ErrorCorruptedPacket
}
request.Address = v2net.IPAddress(buffer.Value[lenBuffer : lenBuffer+4])
lenBuffer += 4
case AddrTypeIPv6:
_, err := io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+16])
if err != nil {
log.Error("Shadowsocks: Failed to read IPv6 address: ", err)
return nil, transport.ErrorCorruptedPacket
}
request.Address = v2net.IPAddress(buffer.Value[lenBuffer : lenBuffer+16])
lenBuffer += 16
case AddrTypeDomain:
_, err := io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+1])
if err != nil {
log.Error("Shadowsocks: Failed to read domain lenth: ", err)
return nil, transport.ErrorCorruptedPacket
}
domainLength := int(buffer.Value[lenBuffer])
lenBuffer++
_, err = io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+domainLength])
if err != nil {
log.Error("Shadowsocks: Failed to read domain: ", err)
return nil, transport.ErrorCorruptedPacket
}
request.Address = v2net.DomainAddress(string(buffer.Value[lenBuffer : lenBuffer+domainLength]))
lenBuffer += domainLength
default:
log.Error("Shadowsocks: Unknown address type: ", addrType)
return nil, transport.ErrorCorruptedPacket
}
_, err = io.ReadFull(reader, buffer.Value[lenBuffer:lenBuffer+2])
if err != nil {
log.Error("Shadowsocks: Failed to read port: ", err)
return nil, transport.ErrorCorruptedPacket
}
request.Port = v2net.PortFromBytes(buffer.Value[lenBuffer : lenBuffer+2])
lenBuffer += 2
var authBytes []byte
if udp {
nBytes, err := reader.Read(buffer.Value[lenBuffer:])
if err != nil {
log.Error("Shadowsocks: Failed to read UDP payload: ", err)
}
buffer.Slice(0, lenBuffer+nBytes)
if request.OTA {
authBytes = buffer.Value[lenBuffer+nBytes-AuthSize:]
request.UDPPayload = alloc.NewSmallBuffer().Clear().Append(buffer.Value[lenBuffer : lenBuffer+nBytes-AuthSize])
lenBuffer = lenBuffer + nBytes - AuthSize
} else {
request.UDPPayload = alloc.NewSmallBuffer().Clear().Append(buffer.Value[lenBuffer:])
}
} else {
if request.OTA {
authBytes = buffer.Value[lenBuffer : lenBuffer+AuthSize]
_, err = io.ReadFull(reader, authBytes)
if err != nil {
log.Error("Shadowsocks: Failed to read OTA: ", err)
return nil, transport.ErrorCorruptedPacket
}
}
}
if request.OTA {
actualAuth := auth.Authenticate(nil, buffer.Value[0:lenBuffer])
if !serial.BytesLiteral(actualAuth).Equals(serial.BytesLiteral(authBytes)) {
log.Error("Shadowsocks: Invalid OTA: ", actualAuth)
return nil, transport.ErrorCorruptedPacket
}
}
return request, nil
}
// PortFromBytes converts a byte array to a Port, assuming bytes are in big endian order.
// @unsafe Caller must ensure that the byte array has at least 2 elements.
func PortFromBytes(port []byte) Port {
return Port(serial.BytesLiteral(port).Uint16Value())
}
func TestCmdKey(t *testing.T) {
v2testing.Current(t)
id := NewID(uuid.New())
assert.Bool(serial.BytesLiteral(id.CmdKey()).AllZero()).IsFalse()
}
func (this *ServerSession) DecodeRequestHeader(reader io.Reader) (*protocol.RequestHeader, error) {
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
_, err := io.ReadFull(reader, buffer.Value[:protocol.IDBytesLen])
if err != nil {
log.Error("Raw: Failed to read request header: ", err)
return nil, err
}
user, timestamp, valid := this.userValidator.Get(buffer.Value[:protocol.IDBytesLen])
if !valid {
return nil, protocol.ErrorInvalidUser
}
timestampHash := md5.New()
timestampHash.Write(hashTimestamp(timestamp))
iv := timestampHash.Sum(nil)
aesStream := crypto.NewAesDecryptionStream(user.ID.CmdKey(), iv)
decryptor := crypto.NewCryptionReader(aesStream, reader)
nBytes, err := io.ReadFull(decryptor, buffer.Value[:41])
if err != nil {
log.Debug("Raw: Failed to read request header (", nBytes, " bytes): ", err)
return nil, err
}
bufferLen := nBytes
request := &protocol.RequestHeader{
User: user,
Version: buffer.Value[0],
}
if request.Version != Version {
log.Warning("Raw: Invalid protocol version ", request.Version)
return nil, protocol.ErrorInvalidVersion
}
this.requestBodyIV = append([]byte(nil), buffer.Value[1:17]...) // 16 bytes
this.requestBodyKey = append([]byte(nil), buffer.Value[17:33]...) // 16 bytes
this.responseHeader = buffer.Value[33] // 1 byte
request.Option = protocol.RequestOption(buffer.Value[34]) // 1 byte + 2 bytes reserved
request.Command = protocol.RequestCommand(buffer.Value[37])
request.Port = v2net.PortFromBytes(buffer.Value[38:40])
switch buffer.Value[40] {
case AddrTypeIPv4:
nBytes, err = io.ReadFull(decryptor, buffer.Value[41:45]) // 4 bytes
bufferLen += 4
if err != nil {
log.Debug("VMess: Failed to read target IPv4 (", nBytes, " bytes): ", err)
return nil, err
}
request.Address = v2net.IPAddress(buffer.Value[41:45])
case AddrTypeIPv6:
nBytes, err = io.ReadFull(decryptor, buffer.Value[41:57]) // 16 bytes
bufferLen += 16
if err != nil {
log.Debug("VMess: Failed to read target IPv6 (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
request.Address = v2net.IPAddress(buffer.Value[41:57])
case AddrTypeDomain:
nBytes, err = io.ReadFull(decryptor, buffer.Value[41:42])
if err != nil {
log.Debug("VMess: Failed to read target domain (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
domainLength := int(buffer.Value[41])
if domainLength == 0 {
return nil, transport.ErrorCorruptedPacket
}
nBytes, err = io.ReadFull(decryptor, buffer.Value[42:42+domainLength])
if err != nil {
log.Debug("VMess: Failed to read target domain (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
bufferLen += 1 + domainLength
domainBytes := append([]byte(nil), buffer.Value[42:42+domainLength]...)
request.Address = v2net.DomainAddress(string(domainBytes))
}
nBytes, err = io.ReadFull(decryptor, buffer.Value[bufferLen:bufferLen+4])
if err != nil {
log.Debug("VMess: Failed to read checksum (", nBytes, " bytes): ", nBytes, err)
return nil, err
}
fnv1a := fnv.New32a()
fnv1a.Write(buffer.Value[:bufferLen])
actualHash := fnv1a.Sum32()
expectedHash := serial.BytesLiteral(buffer.Value[bufferLen : bufferLen+4]).Uint32Value()
if actualHash != expectedHash {
return nil, transport.ErrorCorruptedPacket
}
return request, nil
}
