internal void ProcessGlobalRequest(System.String requestname, bool wantreply, byte[] requestdata) { #if DEBUG System.Diagnostics.Trace.WriteLine("Processing global request " + requestname); #endif try { bool success = false; GlobalRequest request = new GlobalRequest(requestname, requestdata); if (requesthandlers.ContainsKey(requestname)) { #if DEBUG System.Diagnostics.Trace.WriteLine("Found handler for request " + requestname); #endif success = ((GlobalRequestHandler)requesthandlers[requestname]).ProcessGlobalRequest(request); } #if DEBUG else { System.Diagnostics.Trace.WriteLine("Cannot find handler for request " + requestname); } #endif if (wantreply) { SSHPacket packet = GetPacket(); if (success) { packet.WriteByte(SSH_MSG_REQUEST_SUCCESS); if (request.Data != null) { packet.WriteBytes(requestdata); } #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_REQUEST_SUCCESS"); #endif transport.SendMessage(packet); } else { // Return a response packet.WriteByte(SSH_MSG_REQUEST_FAILURE); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_REQUEST_FAILURE"); #endif transport.SendMessage(packet); } } } catch (System.IO.IOException ex) { throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR); } }
/// <summary> /// Sends a global request. /// </summary> /// <param name="request"></param> /// <param name="wantreply"></param> /// <returns></returns> public bool SendGlobalRequest(GlobalRequest request, bool wantreply) { try { SSHPacket packet = GetPacket(); packet.WriteByte(SSH_MSG_GLOBAL_REQUEST); packet.WriteString(request.Name); packet.WriteBool(wantreply); if (request.Data != null) { packet.WriteBytes(request.Data); } #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_GLOBAL_REQUEST"); System.Diagnostics.Trace.WriteLine(request.Name); #endif SendMessage(packet); if (wantreply) { packet = GlobalMessages.NextMessage(GLOBAL_REQUEST_MESSAGES); if (packet.MessageID == SSH_MSG_REQUEST_SUCCESS) { if (packet.Available > 1) { byte[] tmp = new byte[packet.Available]; packet.ReadBytes(tmp); request.Data = tmp; } else { request.Data = null; } return(true); } else { return(false); } } else { return(true); } } catch (System.IO.IOException ex) { throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR); } }
internal void SendKeyExchangeInit() { try { FireStateChange(TransportProtocolState.PERFORMING_KEYEXCHANGE); numIncomingBytesSinceKEX = 0; numIncomingSSHPacketsSinceKEX = 0; numOutgoingBytesSinceKEX = 0; numOutgoingSSHPacketsSinceKEX = 0; currentState = TransportProtocolState.PERFORMING_KEYEXCHANGE; SSHPacket packet = GetSSHPacket(true); SSH2Context transportContext = (SSH2Context)client.Context; byte[] cookie = new byte[16]; rnd.GetBytes(cookie); packet.WriteByte((byte)SSH_MSG_KEX_INIT); packet.WriteBytes(cookie); packet.WriteString("diffie-hellman-group1-sha1"); packet.WriteString(transportContext.SupportedPublicKeys.List(transportContext.PreferredPublicKey)); packet.WriteString(transportContext.SupportedCiphers.List(transportContext.PreferredCipherCS)); packet.WriteString(transportContext.SupportedCiphers.List(transportContext.PreferredCipherSC)); packet.WriteString(transportContext.SupportedMACs.List(transportContext.PreferredMacCS)); packet.WriteString(transportContext.SupportedMACs.List(transportContext.PreferredMacSC)); packet.WriteString("none"); packet.WriteString("none"); packet.WriteString(""); packet.WriteString(""); packet.WriteByte((byte)0); packet.WriteUINT32(0); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_KEX_INIT"); #endif localkex = SendMessage(packet, true); } catch (System.IO.IOException ex) { throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR); } }
/// <summary> /// Sends a channel request. Many channels have extensions that are specific to that particular /// channel type, an example of which is requesting a pseudo terminal from an interactive session. /// </summary> /// <param name="requesttype">the name of the request, for example "pty-req"</param> /// <param name="wantreply">specifies whether the remote side should send a success/failure message</param> /// <param name="requestdata">the request data</param> /// <returns></returns> public bool SendRequest(System.String requesttype, bool wantreply, byte[] requestdata) { lock (this) { try { SSHPacket packet = connection.GetPacket(); packet.WriteByte((System.Byte)SSH_MSG_CHANNEL_REQUEST); packet.WriteUINT32(remoteid); packet.WriteString(requesttype); packet.WriteBool(wantreply); if (requestdata != null) { packet.WriteBytes(requestdata); } #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_REQUEST " + requesttype); System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID); #endif connection.SendMessage(packet); bool result = false; if (wantreply) { packet = ProcessMessages(CHANNEL_REQUEST_MESSAGES); return(packet.MessageID == SSH_MSG_CHANNEL_SUCCESS); } return(result); } catch (System.IO.IOException ex) { throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR); } } }
/// <summary> /// Send an authentication request. This method will be called from the <see cref="Maverick.SSH2.SSH2AuthenticationClient.Authenticate"/> /// method to initiate the authentication proceedure. /// </summary> /// <param name="username"></param> /// <param name="servicename"></param> /// <param name="methodname"></param> /// <param name="requestdata"></param> public void SendRequest(String username, String servicename, String methodname, byte[] requestdata) { try { SSHPacket packet = transport.GetSSHPacket(true); packet.WriteByte(SSH_MSG_USERAUTH_REQUEST); packet.WriteString(username); packet.WriteString(servicename); packet.WriteString(methodname); if (requestdata != null) { packet.WriteBytes(requestdata); } transport.SendMessage(packet); } catch (IOException ex) { throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR); } }
/// <summary> /// Send a message to the remote side of the connection. /// </summary> /// <param name="packet"></param> /// <param name="returnPayload">Return the unecrypted payload of this packet.</param> public byte[] SendMessage(SSHPacket packet, bool returnPayload) { byte[] payload = null; lock (this) { if (currentState == TransportProtocolState.PERFORMING_KEYEXCHANGE && !IsTransportMessage(packet.MessageID)) { lock (kexqueue) { kexqueue.Add(packet); return(payload); } } try { int padding = 4; // Compress the payload if necersary /*if (outgoingCompression != null) * { * msgdata = outgoingCompression.compress(msgdata, 0, msgdata.Length); * }*/ // Determine the padding length padding += ((outgoingCipherLength - ((packet.Length + padding) % outgoingCipherLength)) % outgoingCipherLength); packet.MoveToPosition(0); // Write the packet length field packet.WriteUINT32(packet.Length - 4 + padding); // Write the padding length packet.WriteByte((byte)padding); // Now skip back up to the end of the packet packet.MoveToEnd(); if (returnPayload) { payload = packet.Payload; } // Create some random data for the padding byte[] pad = new byte[padding]; rnd.GetBytes(pad); packet.WriteBytes(pad); // Generate the MAC if (outgoingMac != null) { outgoingMac.Generate(outgoingSequence, packet.Array, 0, packet.Length, packet.Array, packet.Length); } // Perfrom encrpytion if (encryption != null) { encryption.Transform(packet.Array, 0, packet.Array, 0, packet.Length); } packet.Skip(outgoingMacLength); outgoingBytes += packet.Length; // Send! packet.WriteToStream(transport.GetStream()); outgoingSequence++; numOutgoingBytesSinceKEX += (uint)packet.Length; numOutgoingSSHPacketsSinceKEX++; ReleaseSSHPacket(packet); if (outgoingSequence > 4294967295) { outgoingSequence = 0; } if (numOutgoingBytesSinceKEX >= MAX_NUM_BYTES_BEFORE_REKEY || numOutgoingSSHPacketsSinceKEX >= MAX_NUM_PACKETS_BEFORE_REKEY) { SendKeyExchangeInit(); } } catch (System.IO.IOException ex) { InternalDisconnect(); throw new SSHException("Unexpected termination: " + ex.Message, SSHException.UNEXPECTED_TERMINATION); } catch (System.ObjectDisposedException ex) { InternalDisconnect(); throw new SSHException("Unexpected terminaton: " + ex.Message, SSHException.UNEXPECTED_TERMINATION); } } return(payload); }
/// <summary> /// Process a channel open request. /// </summary> /// <param name="type"></param> /// <param name="remoteid"></param> /// <param name="remotewindow"></param> /// <param name="remotepacket"></param> /// <param name="requestdata"></param> internal void ProcessChannelOpenRequest(System.String type, int remoteid, int remotewindow, int remotepacket, byte[] requestdata) { try { SSHPacket packet = GetPacket(); if (channelfactories.ContainsKey(type)) { try { SSH2Channel channel = ((ChannelFactory)channelfactories[type]).CreateChannel(type, requestdata); // Allocate a channel int localid = AllocateChannel(channel); if (localid > -1) { try { channel.Init(this, localid); byte[] responsedata = channel.Create(); packet.WriteByte(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); packet.WriteUINT32(remoteid); packet.WriteUINT32(localid); packet.WriteUINT32(channel.WindowSize); packet.WriteUINT32(channel.PacketSize); if (responsedata != null) { packet.WriteBytes(requestdata); } #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_OPEN_CONFIRMATION"); System.Diagnostics.Trace.WriteLine("Channelid=" + localid); System.Diagnostics.Trace.WriteLine("Remoteid=" + remoteid); #endif transport.SendMessage(packet); channel.Open(remoteid, remotewindow, remotepacket); return; } catch (SSHException ex) { #if DEBUG System.Diagnostics.Trace.WriteLine("Exception occured whilst opening channel"); System.Diagnostics.Trace.WriteLine(ex.StackTrace); #endif packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE); packet.WriteUINT32(remoteid); packet.WriteUINT32(ChannelOpenException.CONNECT_FAILED); packet.WriteString(ex.Message); packet.WriteString(""); } } else { #if DEBUG System.Diagnostics.Trace.WriteLine("Maximum allowable open channel limit of " + MaximumNumChannels + " exceeded!"); #endif packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE); packet.WriteUINT32(remoteid); packet.WriteUINT32(ChannelOpenException.RESOURCE_SHORTAGE); packet.WriteString("Maximum allowable open channel limit of " + MaximumNumChannels + " exceeded!"); packet.WriteString(""); } } catch (ChannelOpenException ex) { #if DEBUG System.Diagnostics.Trace.WriteLine("Channel open exception occured whilst opening channel"); System.Diagnostics.Trace.WriteLine(ex.StackTrace); #endif packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE); packet.WriteUINT32(remoteid); packet.WriteUINT32(ex.Reason); packet.WriteString(ex.Message); packet.WriteString(""); } } else { #if DEBUG System.Diagnostics.Trace.WriteLine(type + " is not a supported channel type"); #endif packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE); packet.WriteUINT32(remoteid); packet.WriteUINT32(ChannelOpenException.UNKNOWN_CHANNEL_TYPE); packet.WriteString(type + " is not a supported channel type!"); packet.WriteString(""); } #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_OPEN_FAILURE"); System.Diagnostics.Trace.WriteLine("Remoteid=" + remoteid); System.Diagnostics.Trace.WriteLine("Name=" + type); #endif transport.SendMessage(packet); } catch (System.IO.IOException ex1) { throw new SSHException(ex1.Message, SSHException.INTERNAL_ERROR); } }
/// <summary> /// Opens a channel /// </summary> /// <param name="channel"></param> /// <param name="requestdata"></param> public void OpenChannel(SSH2Channel channel, byte[] requestdata) { lock (this) { try { int channelid = AllocateChannel(channel); if (channelid == -1) { throw new ChannelOpenException("Maximum number of channels exceeded", ChannelOpenException.RESOURCE_SHORTAGE); } channel.Init(this, channelid); SSHPacket packet = GetPacket(); packet.WriteByte(SSH_MSG_CHANNEL_OPEN); packet.WriteString(channel.Name); packet.WriteUINT32(channel.ChannelID); packet.WriteUINT32(channel.WindowSize); packet.WriteUINT32(channel.PacketSize); if (requestdata != null) { packet.WriteBytes(requestdata); } #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_OPEN"); System.Diagnostics.Trace.WriteLine("Channelid=" + channel.ChannelID); System.Diagnostics.Trace.WriteLine("Name=" + channel.Name); #endif transport.SendMessage(packet); packet = channel.MessageStore.NextMessage(CHANNEL_OPEN_RESPONSE_MESSAGES); #if DEBUG System.Diagnostics.Trace.WriteLine("Received reply to SSH_MSG_CHANNEL_OPEN"); channel.LogMessage(packet); #endif if (packet.MessageID == SSH_MSG_CHANNEL_OPEN_FAILURE) { FreeChannel(channel); int reason = (int)packet.ReadUINT32(); throw new ChannelOpenException(packet.ReadString(), reason); } else { int remoteid = (int)packet.ReadUINT32(); int remotewindow = (int)packet.ReadUINT32(); int remotepacket = (int)packet.ReadUINT32(); byte[] responsedata = new byte[packet.Available]; packet.ReadBytes(responsedata); channel.Open(remoteid, remotewindow, remotepacket, responsedata); return; } } catch (System.IO.IOException ex) { throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR); } } }