private void ProcessPortforwardingRequest(ISSHConnectionEventReceiver receiver, SSH1Packet packet)
        {
            SSH1DataReader reader         = new SSH1DataReader(packet.Data);
            int            server_channel = reader.ReadInt32();
            string         host           = Encoding.Default.GetString(reader.ReadString());
            int            port           = reader.ReadInt32();

            SSH1DataWriter            writer = new SSH1DataWriter();
            PortForwardingCheckResult result = receiver.CheckPortForwardingRequest(host, port, "", 0);

            if (result.allowed)
            {
                int local_id = this.RegisterChannelEventReceiver(null, result.channel)._localID;
                _eventReceiver.EstablishPortforwarding(result.channel, new SSH1Channel(this, ChannelType.ForwardedRemoteToLocal, local_id, server_channel));

                writer.Write(server_channel);
                writer.Write(local_id);
                SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION, writer.ToByteArray());
                p.WriteTo(_stream, _tCipher);
            }
            else
            {
                writer.Write(server_channel);
                SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE, writer.ToByteArray());
                p.WriteTo(_stream, _tCipher);
            }
        }
        private void ExecShell()
        {
            //System.out.println("EXEC SHELL");
            SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_EXEC_SHELL);

            SSH1Packet.WriteTo(_stream, _tCipher);
        }
        private void SendPlainPassword()
        {
            SSH1DataWriter writer = new SSH1DataWriter();

            writer.Write(_param.Password);
            SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_AUTH_PASSWORD, writer.ToByteArray());

            SSH1Packet.WriteTo(_stream, _tCipher);
        }
        private void SendUserName(string username)
        {
            SSH1DataWriter writer = new SSH1DataWriter();

            writer.Write(username);
            SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_USER, writer.ToByteArray());

            SSH1Packet.WriteTo(_stream, _tCipher);
        }
        //RSA authentication
        private void DoRSAChallengeResponse()
        {
            //read key
            SSH1UserAuthKey key = new SSH1UserAuthKey(_param.IdentityFile, _param.Password);
            SSH1DataWriter  w   = new SSH1DataWriter();

            w.Write(key.PublicModulus);
            SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_AUTH_RSA, w.ToByteArray());

            p.WriteTo(_stream, _tCipher);

            p = ReceivePacket();
            if (p.Type == PacketType.SSH_SMSG_FAILURE)
            {
                throw new SSHException(Strings.GetString("ServerRefusedRSA"));
            }
            else if (p.Type != PacketType.SSH_SMSG_AUTH_RSA_CHALLENGE)
            {
                throw new SSHException(String.Format(Strings.GetString("UnexpectedResponse"), p.Type));
            }

            //creating challenge
            SSH1DataReader r         = new SSH1DataReader(p.Data);
            BigInteger     challenge = key.decryptChallenge(r.ReadMPInt());

            byte[] rawchallenge = RSAUtil.StripPKCS1Pad(challenge, 2).getBytes();

            //building response
            MemoryStream bos = new MemoryStream();

            bos.Write(rawchallenge, 0, rawchallenge.Length);             //!!mindtermでは頭が0かどうかで変なハンドリングがあった
            bos.Write(_sessionID, 0, _sessionID.Length);
            byte[] response = new MD5CryptoServiceProvider().ComputeHash(bos.ToArray());

            w = new SSH1DataWriter();
            w.Write(response);
            p = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_AUTH_RSA_RESPONSE, w.ToByteArray());
            p.WriteTo(_stream, _tCipher);
        }
        private void SendRequestPTY()
        {
            SSH1DataWriter writer = new SSH1DataWriter();

            writer.Write(_param.TerminalName);
            writer.Write(_param.TerminalHeight);
            writer.Write(_param.TerminalWidth);
            writer.Write(_param.TerminalPixelWidth);
            writer.Write(_param.TerminalPixelHeight);
            writer.Write(new byte[1]);             //TTY_OP_END
            SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_REQUEST_PTY, writer.ToByteArray());

            SSH1Packet.WriteTo(_stream, _tCipher);
        }
        public override void Disconnect(string msg)
        {
            if (_closed)
            {
                return;
            }
            SSH1DataWriter w = new SSH1DataWriter();

            w.Write(msg);
            SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_MSG_DISCONNECT, w.ToByteArray());

            p.WriteTo(_stream, _tCipher);
            _stream.Flush();
            _closed = true;
            _stream.Close();
        }
        public override void ListenForwardedPort(string allowed_host, int bind_port)
        {
            SSH1DataWriter writer = new SSH1DataWriter();

            writer.Write(bind_port);
            writer.Write(allowed_host);
            writer.Write(0);
            SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_PORT_FORWARD_REQUEST, writer.ToByteArray());

            p.WriteTo(_stream, _tCipher);

            if (_shellID == -1)
            {
                ExecShell();
                _shellID = RegisterChannelEventReceiver(null, new SSH1DummyReceiver())._localID;
            }
        }
        public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port)
        {
            if (_shellID == -1)
            {
                ExecShell();
                _shellID = RegisterChannelEventReceiver(null, new SSH1DummyReceiver())._localID;
            }

            int local_id = this.RegisterChannelEventReceiver(null, receiver)._localID;

            SSH1DataWriter writer = new SSH1DataWriter();

            writer.Write(local_id);             //channel id is fixed to 0
            writer.Write(remote_host);
            writer.Write(remote_port);
            //originator is specified only if SSH_PROTOFLAG_HOST_IN_FWD_OPEN is specified
            //writer.Write(originator_host);
            SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_MSG_PORT_OPEN, writer.ToByteArray());

            SSH1Packet.WriteTo(_stream, _tCipher);

            return(new SSH1Channel(this, ChannelType.ForwardedLocalToRemote, local_id));
        }
        private void SendSessionKey(byte[] session_key)
        {
            try
            {
                //step1 XOR with session_id
                byte[] working_data = new byte[session_key.Length];
                byte[] session_id   = CalcSessionID();
                Array.Copy(session_key, 0, working_data, 0, session_key.Length);
                for (int i = 0; i < session_id.Length; i++)
                {
                    working_data[i] ^= session_id[i];
                }

                //step2 decrypts with RSA
                RSAPublicKey  first_encryption;
                RSAPublicKey  second_encryption;
                SSHServerInfo si = _cInfo._serverinfo;
                int           first_key_bytelen, second_key_bytelen;
                if (si.server_key_bits < si.host_key_bits)
                {
                    first_encryption   = new RSAPublicKey(si.server_key_public_exponent, si.server_key_public_modulus);
                    second_encryption  = new RSAPublicKey(si.host_key_public_exponent, si.host_key_public_modulus);
                    first_key_bytelen  = (si.server_key_bits + 7) / 8;
                    second_key_bytelen = (si.host_key_bits + 7) / 8;
                }
                else
                {
                    first_encryption   = new RSAPublicKey(si.host_key_public_exponent, si.host_key_public_modulus);
                    second_encryption  = new RSAPublicKey(si.server_key_public_exponent, si.server_key_public_modulus);
                    first_key_bytelen  = (si.host_key_bits + 7) / 8;
                    second_key_bytelen = (si.server_key_bits + 7) / 8;
                }

                BigInteger first_result  = RSAUtil.PKCS1PadType2(new BigInteger(working_data), first_key_bytelen, _param.Random).modPow(first_encryption.Exponent, first_encryption.Modulus);
                BigInteger second_result = RSAUtil.PKCS1PadType2(first_result, second_key_bytelen, _param.Random).modPow(second_encryption.Exponent, second_encryption.Modulus);

                //output
                SSH1DataWriter writer = new SSH1DataWriter();
                writer.Write((byte)_cInfo._algorithmForTransmittion);
                writer.Write(si.anti_spoofing_cookie);
                writer.Write(second_result);
                writer.Write(0);                 //protocol flags

                //send
                SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_SESSION_KEY, writer.ToByteArray());
                SSH1Packet.WriteTo(_stream);

                _sessionID = session_id;
            }
            catch (Exception e)
            {
                if (e is IOException)
                {
                    throw (IOException)e;
                }
                else
                {
                    string t = e.StackTrace;
                    throw new SSHException(e.Message);                     //IOException以外はみなSSHExceptionにしてしまう
                }
            }
        }
 internal void Transmit(SSH1Packet p)
 {
     lock (this) {
         p.WriteTo(_stream, _tCipher);
     }
 }
 internal void Transmit(SSH1Packet p)
 {
     lock(this) {
         p.WriteTo(_stream, _tCipher);
     }
 }