public override void Close() { if(_connection.IsClosed) return; SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_CLOSE); wr.Write(_remoteID); TransmitPacket(wr.ToByteArray()); }
public override void ResizeTerminal(int width, int height, int pixel_width, int pixel_height) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST); wr.Write(_remoteID); wr.Write("window-change"); wr.Write(false); wr.Write(width); wr.Write(height); wr.Write(pixel_width); //no graphics wr.Write(pixel_height); TransmitPacket(wr.ToByteArray()); }
private void ProcessPortforwardingRequest(ISSHConnectionEventReceiver receiver, SSH2DataReader reader) { string method = Encoding.ASCII.GetString(reader.ReadString()); int remote_channel = reader.ReadInt32(); int window_size = reader.ReadInt32(); //skip initial window size int servermaxpacketsize = reader.ReadInt32(); string host = Encoding.ASCII.GetString(reader.ReadString()); int port = reader.ReadInt32(); string originator_ip = Encoding.ASCII.GetString(reader.ReadString()); int originator_port = reader.ReadInt32(); PortForwardingCheckResult r = receiver.CheckPortForwardingRequest(host,port,originator_ip,originator_port); SSH2DataWriter wr = new SSH2DataWriter(); if(r.allowed) { //send OPEN_CONFIRMATION SSH2Channel channel = new SSH2Channel(this, ChannelType.ForwardedRemoteToLocal, RegisterChannelEventReceiver(null, r.channel)._localID, remote_channel, servermaxpacketsize); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION); wr.Write(remote_channel); wr.Write(channel.LocalChannelID); wr.Write(_param.WindowSize); //initial window size wr.Write(_param.MaxPacketSize); //max packet size receiver.EstablishPortforwarding(r.channel, channel); } else { wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE); wr.Write(remote_channel); wr.Write(r.reason_code); wr.Write(r.reason_message); wr.Write(""); //lang tag } TransmitPacket(wr.ToByteArray()); }
public override void SendIgnorableData(string msg) { SSH2DataWriter w = new SSH2DataWriter(); w.WritePacketType(PacketType.SSH_MSG_IGNORE); w.Write(msg); TransmitPacket(w.ToByteArray()); }
public override SSHChannel OpenShell(ISSHChannelEventReceiver receiver) { //open channel SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN); wr.Write("session"); int local_channel = this.RegisterChannelEventReceiver(null, receiver)._localID; wr.Write(local_channel); wr.Write(_param.WindowSize); //initial window size int windowsize = _param.WindowSize; wr.Write(_param.MaxPacketSize); //max packet size SSH2Channel channel = new SSH2Channel(this, ChannelType.Shell, local_channel); TransmitPacket(wr.ToByteArray()); return channel; }
public override void ListenForwardedPort(string allowed_host, int bind_port) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_GLOBAL_REQUEST); wr.Write("tcpip-forward"); wr.Write(true); wr.Write(allowed_host); wr.Write(bind_port); _waitingForPortForwardingResponse = true; TransmitPacket(wr.ToByteArray()); }
//maybe this is SSH2 only feature public void SetEnvironmentVariable(string name, string value) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST); wr.Write(_remoteID); wr.Write("env"); wr.Write(false); wr.Write(name); wr.Write(value); TransmitPacket(wr.ToByteArray()); }
public override void CancelForwardedPort(string host, int port) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_GLOBAL_REQUEST); wr.Write("cancel-tcpip-forward"); wr.Write(true); wr.Write(host); wr.Write(port); TransmitPacket(wr.ToByteArray()); }
public override void Disconnect(string msg) { if(_closed) return; SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_DISCONNECT); wr.Write(0); wr.Write(msg); wr.Write(""); //language TransmitPacket(wr.ToByteArray()); _stream.Flush(); _closed = true; _stream.Close(); }
internal void ProcessPacket(ISSHChannelEventReceiver receiver, PacketType pt, int data_length, SSH2DataReader re) { //NOTE: the offset of 're' is next to 'receipiant channel' field _leftWindowSize -= data_length; if(pt!=PacketType.SSH_MSG_CHANNEL_EOF && pt!=PacketType.SSH_MSG_CHANNEL_CLOSE) { //window adjust is not necessary if the channel is being closed while(_leftWindowSize <= _windowSize) { SSH2DataWriter adj = new SSH2DataWriter(); adj.WritePacketType(PacketType.SSH_MSG_CHANNEL_WINDOW_ADJUST); adj.Write(_remoteID); adj.Write(_windowSize); TransmitPacket(adj.ToByteArray()); _leftWindowSize += _windowSize; //Debug.WriteLine("Window size is adjusted to " + _leftWindowSize); } } if(pt==PacketType.SSH_MSG_CHANNEL_WINDOW_ADJUST) { int w = re.ReadInt32(); //some servers may not send SSH_MSG_CHANNEL_WINDOW_ADJUST. //it is dangerous to wait this message in send procedure _allowedDataSize += w; //Debug.WriteLine(String.Format("Window Adjust +={0}",w)); } else if(_negotiationStatus!=0) { //when the negotiation is not completed if(_type==ChannelType.Shell) OpenShell(receiver, pt, re); else if(_type==ChannelType.ForwardedLocalToRemote) ReceivePortForwardingResponse(receiver, pt, re); else if(_type==ChannelType.Session) EstablishSession(receiver, pt, re); } else { switch(pt) { case PacketType.SSH_MSG_CHANNEL_DATA: { int len = re.ReadInt32(); receiver.OnData(re.Image, re.Offset, len); } break; case PacketType.SSH_MSG_CHANNEL_EXTENDED_DATA: { int t = re.ReadInt32(); byte[] data = re.ReadString(); receiver.OnExtendedData(t, data); } break; case PacketType.SSH_MSG_CHANNEL_REQUEST: { string request = Encoding.ASCII.GetString(re.ReadString()); bool reply = re.ReadBool(); if(request=="exit-status") { int status = re.ReadInt32(); } else if(reply) { //we reject unknown requests including keep-alive check SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_FAILURE); wr.Write(_remoteID); TransmitPacket(wr.ToByteArray()); } } break; case PacketType.SSH_MSG_CHANNEL_EOF: receiver.OnChannelEOF(); break; case PacketType.SSH_MSG_CHANNEL_CLOSE: _connection.UnregisterChannelEventReceiver(_localID); receiver.OnChannelClosed(); break; case PacketType.SSH_MSG_CHANNEL_FAILURE: case PacketType.SSH_MSG_CHANNEL_SUCCESS: receiver.OnMiscPacket((byte)pt, re.Image, re.Offset, re.Rest); break; default: receiver.OnMiscPacket((byte)pt, re.Image, re.Offset, re.Rest); Debug.WriteLine("Unknown Packet "+pt); break; } } }
private void OpenShell(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader reader) { if(_negotiationStatus==3) { if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) { if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE) receiver.OnChannelError(null, "opening channel failed; packet type="+pt); else { int errcode = reader.ReadInt32(); string msg = Encoding.ASCII.GetString(reader.ReadString()); receiver.OnChannelError(null, msg); } Close(); } else { _remoteID = reader.ReadInt32(); _allowedDataSize = reader.ReadInt32(); _serverMaxPacketSize = reader.ReadInt32(); //open pty SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST); wr.Write(_remoteID); wr.Write("pty-req"); wr.Write(true); wr.Write(_connection.Param.TerminalName); wr.Write(_connection.Param.TerminalWidth); wr.Write(_connection.Param.TerminalHeight); wr.Write(_connection.Param.TerminalPixelWidth); wr.Write(_connection.Param.TerminalPixelHeight); wr.WriteAsString(new byte[0]); TransmitPacket(wr.ToByteArray()); _negotiationStatus = 2; } } else if(_negotiationStatus==2) { if(pt!=PacketType.SSH_MSG_CHANNEL_SUCCESS) { receiver.OnChannelError(null, "opening pty failed"); Close(); } else { //open shell SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST); wr.Write(_remoteID); wr.Write("shell"); wr.Write(true); TransmitPacket(wr.ToByteArray()); _negotiationStatus = 1; } } else if(_negotiationStatus==1) { if(pt!=PacketType.SSH_MSG_CHANNEL_SUCCESS) { receiver.OnChannelError(null, "Opening shell failed: packet type="+pt.ToString()); Close(); } else { receiver.OnChannelReady(); _negotiationStatus = 0; //goal! } } else Debug.Assert(false); }
public override void Transmit(byte[] data, int offset, int length) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_DATA); wr.Write(_remoteID); wr.WriteAsString(data, offset, length); TransmitPacket(wr.ToByteArray()); }
public override void Transmit(byte[] data) { //!!it is better idea that we wait a WINDOW_ADJUST if the left size is lack SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_DATA); wr.Write(_remoteID); wr.WriteAsString(data); TransmitPacket(wr.ToByteArray()); }
private void SendKEXINIT() { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_KEXINIT); byte[] cookie = new byte[16]; _param.Random.NextBytes(cookie); wr.Write(cookie); wr.Write("diffie-hellman-group1-sha1"); // kex_algorithms wr.Write(FormatHostKeyAlgorithmDescription()); // server_host_key_algorithms wr.Write(FormatCipherAlgorithmDescription()); // encryption_algorithms_client_to_server wr.Write(FormatCipherAlgorithmDescription()); // encryption_algorithms_server_to_client wr.Write("hmac-sha1"); // mac_algorithms_client_to_server wr.Write("hmac-sha1"); // mac_algorithms_server_to_client wr.Write("none"); // compression_algorithms_client_to_server wr.Write("none"); // compression_algorithms_server_to_client wr.Write(""); // languages_client_to_server wr.Write(""); // languages_server_to_client wr.Write(false); //Indicates whether a guessed key exchange packet follows wr.Write(0); //reserved for future extension _clientKEXINITPayload = wr.ToByteArray(); _status = Status.WAIT_KEXINIT; TransmitPacket(_clientKEXINITPayload); }
private void ServiceRequest(string servicename) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_SERVICE_REQUEST); wr.Write(servicename); TransmitPacket(wr.ToByteArray()); byte[] response = ReceivePacket().Data; SSH2DataReader re = new SSH2DataReader(response); PacketType t = re.ReadPacketType(); if(t!=PacketType.SSH_MSG_SERVICE_ACCEPT) { throw new SSHException("service establishment failed "+t); } string s = Encoding.ASCII.GetString(re.ReadString()); if(servicename!=s) throw new SSHException("protocol error"); }
public AuthenticationResult DoKeyboardInteractiveAuth(string[] input) { if(_param.AuthenticationType!=AuthenticationType.KeyboardInteractive) throw new SSHException("DoKeyboardInteractiveAuth() must be called with keyboard-interactive authentication"); SSH2DataWriter re = new SSH2DataWriter(); re.WritePacketType(PacketType.SSH_MSG_USERAUTH_INFO_RESPONSE); re.Write(input.Length); foreach(string t in input) re.Write(t); TransmitPacket(re.ToByteArray()); _authenticationResult = ProcessAuthenticationResponse(); //try again on failure if(_authenticationResult==AuthenticationResult.Failure) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_USERAUTH_REQUEST); wr.Write(_param.UserName); wr.Write("ssh-connection"); wr.Write("keyboard-interactive"); wr.Write(""); //lang wr.Write(""); //submethod TransmitPacket(wr.ToByteArray()); _authenticationResult = ProcessAuthenticationResponse(); } return _authenticationResult; }
private AuthenticationResult UserAuth() { string sn = "ssh-connection"; SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_USERAUTH_REQUEST); wr.Write(_param.UserName); if(_param.AuthenticationType==AuthenticationType.Password) { //Password authentication wr.Write(sn); wr.Write("password"); wr.Write(false); wr.Write(_param.Password); } else if(_param.AuthenticationType==AuthenticationType.KeyboardInteractive) { wr.Write(sn); wr.Write("keyboard-interactive"); wr.Write(""); //lang wr.Write(""); //submethod } else { //public key authentication SSH2UserAuthKey kp = SSH2UserAuthKey.FromSECSHStyleFile(_param.IdentityFile, _param.Password); SSH2DataWriter signsource = new SSH2DataWriter(); signsource.WriteAsString(_sessionID); signsource.WritePacketType(PacketType.SSH_MSG_USERAUTH_REQUEST); signsource.Write(_param.UserName); signsource.Write(sn); signsource.Write("publickey"); signsource.Write(true); signsource.Write(SSH2Util.PublicKeyAlgorithmName(kp.Algorithm)); signsource.WriteAsString(kp.GetPublicKeyBlob()); SSH2DataWriter signpack = new SSH2DataWriter(); signpack.Write(SSH2Util.PublicKeyAlgorithmName(kp.Algorithm)); signpack.WriteAsString(kp.Sign(signsource.ToByteArray())); wr.Write(sn); wr.Write("publickey"); wr.Write(true); wr.Write(SSH2Util.PublicKeyAlgorithmName(kp.Algorithm)); wr.WriteAsString(kp.GetPublicKeyBlob()); wr.WriteAsString(signpack.ToByteArray()); } TransmitPacket(wr.ToByteArray()); _authenticationResult = ProcessAuthenticationResponse(); if(_authenticationResult==AuthenticationResult.Failure) throw new SSHException(Strings.GetString("AuthenticationFailed")); return _authenticationResult; }
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN); wr.Write("direct-tcpip"); int local_id = RegisterChannelEventReceiver(null, receiver)._localID; wr.Write(local_id); wr.Write(_param.WindowSize); //initial window size int windowsize = _param.WindowSize; wr.Write(_param.MaxPacketSize); //max packet size wr.Write(remote_host); wr.Write(remote_port); wr.Write(originator_host); wr.Write(originator_port); SSH2Channel channel = new SSH2Channel(this, ChannelType.ForwardedLocalToRemote, local_id); TransmitPacket(wr.ToByteArray()); return channel; }
public void SendBreak(int time) { SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST); wr.Write(_remoteID); wr.Write("break"); wr.Write(true); wr.Write(time); TransmitPacket(wr.ToByteArray()); }
private void SendKEXDHINIT() { //Round1 computes and sends [e] byte[] sx = new byte[16]; _param.Random.NextBytes(sx); _x = new BigInteger(sx); _e = new BigInteger(2).modPow(_x, DH_PRIME); SSH2DataWriter wr = new SSH2DataWriter(); wr.WritePacketType(PacketType.SSH_MSG_KEXDH_INIT); wr.Write(_e); _status = Status.WAIT_KEXDH_REPLY; TransmitPacket(wr.ToByteArray()); }