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); } }
internal void SendChannelData(byte[] buf, int offset, int len) { try { if (state != CHANNEL_OPEN) { throw new SSHException("The channel is closed", SSHException.CHANNEL_FAILURE); } if (len > 0) { SSHPacket packet = connection.GetPacket(); packet.WriteByte((System.Byte)SSH_MSG_CHANNEL_DATA); packet.WriteUINT32(remoteid); packet.WriteBinaryString(buf, offset, len); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_DATA"); System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID); #endif connection.SendMessage(packet); } } catch (System.IO.IOException ex) { throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR); } }
/// <summary> /// Disconnect the SSH transport protocol. /// </summary> /// <param name="disconnectReason">A descriptive reason for the disconnection.</param> /// <param name="reason">The SSH reason code.</param> public void Disconnect(String disconnectReason, DisconnectionReason reason) { try { this.disconnectReason = disconnectReason; SSHPacket packet = GetSSHPacket(true); packet.WriteByte(SSH_MSG_DISCONNECT); packet.WriteUINT32((int)reason); packet.WriteString(disconnectReason); packet.WriteString(""); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_DISCONNECT"); System.Diagnostics.Trace.WriteLine(disconnectReason); #endif SendMessage(packet); } catch { } finally { InternalDisconnect(); } }
/// <summary> /// Close down the output side of the stream. /// </summary> /// <remarks> /// This method sends an SSH_MSG_CHANNEL_EOF message to the remote side. /// </remarks> public override void CloseOutput() { if (!channel.IsClosed && !outputEOF && !channel.closing && !channel.remoteClosed) { SSHPacket packet = channel.connection.GetPacket(); packet.WriteByte(SSH_MSG_CHANNEL_EOF); packet.WriteUINT32(channel.remoteid); try { #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_EOF"); System.Diagnostics.Trace.WriteLine("Channelid=" + channel.ChannelID); #endif channel.connection.SendMessage(packet); } finally { outputEOF = true; channel.FireEvent(channel, ChannelState.LOCAL_EOF); } } outputEOF = true; }
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 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); } }
/// <summary> /// Process a channel request /// </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> protected internal virtual void ChannelRequest(String requesttype, bool wantreply, byte[] requestdata) { if (wantreply) { SSHPacket packet = connection.GetPacket(); packet.WriteByte(SSH_MSG_CHANNEL_FAILURE); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_FAILURE"); System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID); #endif connection.SendMessage(packet); } }
/// <summary> /// /// </summary> /// <param name="clientId"></param> /// <param name="serverId"></param> /// <param name="clientKexInit"></param> /// <param name="serverKexInit"></param> public override void PerformClientExchange(String clientId, String serverId, byte[] clientKexInit, byte[] serverKexInit) { this.clientId = clientId; this.serverId = serverId; this.clientKexInit = clientKexInit; this.serverKexInit = serverKexInit; BigInteger q = p.subtract(BigInteger.ONE).divide(g); do { x = new BigInteger(p.bitLength(), new RNGCryptoServiceProvider()); }while((x.compareTo(BigInteger.ONE) < 0) && (x.compareTo(q) > 0)); e = g.modPow(x, p); if (e.compareTo(BigInteger.ONE) < 0 || e.compareTo(p.subtract(BigInteger.ONE)) > 0) { throw new SSHException("Key exchange failed to generate e value", SSHException.INTERNAL_ERROR); } SSHPacket packet = transport.GetSSHPacket(true); packet.WriteByte(SSH_MSG_KEXDH_INIT); packet.WriteBigInteger(e); transport.SendMessage(packet); packet = transport.NextMessage(); if (packet.MessageID != SSH_MSG_KEXDH_REPLY) { throw new SSHException("Expected SSH_MSG_KEXDH_REPLY but got message id " + packet.MessageID, SSHException.KEY_EXCHANGE_FAILED); } hostKey = packet.ReadBinaryString(); f = packet.ReadBigInteger(); signature = packet.ReadBinaryString(); secret = f.modPow(x, p); CalculateExchangeHash(); }
/// <summary> /// Sends a close message to the remote side without waiting for a reply /// </summary> public override void SendAsyncClose() { bool performClose = false; lock (this) { if (!closing) { performClose = closing = true; } } if (state == CHANNEL_OPEN && performClose) { try { // Close the ChannelOutputStream stream.Close(); // Send our close message SSHPacket packet = connection.GetPacket(); packet.WriteByte((System.Byte)SSH_MSG_CHANNEL_CLOSE); packet.WriteUINT32(remoteid); try { #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_CLOSE"); System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID); #endif connection.SendMessage(packet); } catch (SSHException) { } } catch (System.IO.EndOfStreamException) { // Ignore this is the message store informing of close/eof } catch (System.IO.IOException ex) { // IO Error during close so the connection has dropped connection.SignalClosingState(); connection.transport.Disconnect("IOException during channel close: " + ex.Message, DisconnectionReason.CONNECTION_LOST); } } }
internal void StartService(String serviceName) { SSHPacket packet = GetSSHPacket(true); packet.WriteByte(SSH_MSG_SERVICE_REQUEST); packet.WriteString(serviceName); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_SERVICE_REQUEST"); System.Diagnostics.Trace.WriteLine(serviceName); #endif SendMessage(packet); do { packet = ReadMessage(); }while(ProcessMessage(packet) || packet.MessageID != SSH_MSG_SERVICE_ACCEPT); }
internal void AdjustWindow(int increment) { try { SSHPacket packet = connection.GetPacket(); packet.WriteByte((System.Byte)SSH_MSG_WINDOW_ADJUST); packet.WriteUINT32(remoteid); packet.WriteUINT32(increment); localwindow.adjust(increment); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_WINDOW_ADJUST"); System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID); #endif connection.SendMessage(packet); } 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); }
internal void PerformKeyExchange(SSHPacket packet) { lock (kexlock) { if (localkex == null) { SendKeyExchangeInit(); } SSH2Context context = (SSH2Context)client.Context; currentState = TransportProtocolState.PERFORMING_KEYEXCHANGE; remotekex = packet.Payload; // Ignore the cookie packet.Skip(16); String remoteKeyExchanges = packet.ReadString(); String remotePublicKeys = packet.ReadString(); String remoteCiphersCS = packet.ReadString(); String remoteCiphersSC = packet.ReadString(); String remoteHMacCS = packet.ReadString(); String remoteHMacSC = packet.ReadString(); String cipherCS = SelectNegotiatedComponent(context.SupportedCiphers.List( context.PreferredCipherCS), remoteCiphersCS); String cipherSC = SelectNegotiatedComponent(context.SupportedCiphers.List( context.PreferredCipherSC), remoteCiphersSC); Cipher encryption = (Cipher)context.SupportedCiphers.GetInstance(cipherCS); Cipher decryption = (Cipher)context.SupportedCiphers.GetInstance(cipherSC); String macCS = SelectNegotiatedComponent(context.SupportedMACs.List( context.PreferredMacCS), remoteHMacCS); String macSC = SelectNegotiatedComponent(context.SupportedMACs.List( context.PreferredMacSC), remoteHMacSC); SSH2Hmac outgoingMac = (SSH2Hmac)context.SupportedMACs.GetInstance(macCS); SSH2Hmac incomingMac = (SSH2Hmac)context.SupportedMACs.GetInstance(macSC); // Ignore compression and languages as were not interested in that atm // Create a Key Exchange instance String kex = SelectNegotiatedComponent(context.SupportedKeyExchanges.List( context.PreferredKeyExchange), remoteKeyExchanges); String publickey = SelectNegotiatedComponent(context.SupportedPublicKeys.List( context.PreferredPublicKey), remotePublicKeys); #if DEBUG // Output the local settings System.Diagnostics.Trace.WriteLine("Local Key exchange settings follow:"); System.Diagnostics.Trace.WriteLine("Key exchange: " + context.SupportedKeyExchanges.List( context.PreferredKeyExchange)); System.Diagnostics.Trace.WriteLine("Public keys : " + context.SupportedPublicKeys.List( context.PreferredPublicKey)); System.Diagnostics.Trace.WriteLine("Ciphers client->server: " + context.SupportedCiphers.List( context.PreferredCipherCS)); System.Diagnostics.Trace.WriteLine("Ciphers server->client: " + context.SupportedCiphers.List( context.PreferredCipherSC)); System.Diagnostics.Trace.WriteLine("HMAC client->server: " + context.SupportedMACs.List( context.PreferredMacCS)); System.Diagnostics.Trace.WriteLine("HMAC server->client: " + context.SupportedMACs.List( context.PreferredMacSC)); // Output the remote settings System.Diagnostics.Trace.WriteLine("Remote Key exchange settings follow:"); System.Diagnostics.Trace.WriteLine("Key exchange: " + remoteKeyExchanges); System.Diagnostics.Trace.WriteLine("Public keys : " + remotePublicKeys); System.Diagnostics.Trace.WriteLine("Ciphers client->server: " + remoteCiphersCS); System.Diagnostics.Trace.WriteLine("Ciphers server->client: " + remoteCiphersSC); System.Diagnostics.Trace.WriteLine("HMAC client->server: " + remoteHMacCS); System.Diagnostics.Trace.WriteLine("HMAC server->client: " + remoteHMacSC); // Output the selected settigns System.Diagnostics.Trace.WriteLine("Selected kex exchange: " + kex); System.Diagnostics.Trace.WriteLine("Selected public key: " + publickey); System.Diagnostics.Trace.WriteLine("Selected cipher client->server: " + cipherCS); System.Diagnostics.Trace.WriteLine("Selected cipher server->client: " + cipherSC); System.Diagnostics.Trace.WriteLine("Selected HMAC client->server: " + macCS); System.Diagnostics.Trace.WriteLine("Selected HMAC server->client: " + macSC); #endif keyexchange = (SSH2KeyExchange)context.SupportedKeyExchanges.GetInstance(kex); keyexchange.Init(this); // Perform the key exchange keyexchange.PerformClientExchange(client.LocalIdentification, client.RemoteIdentification, localkex, remotekex); SSHPublicKey hostkey = (SSHPublicKey)context.SupportedPublicKeys.GetInstance(publickey); hostkey.Init(keyexchange.HostKey, 0, keyexchange.HostKey.Length); if (context.KnownHosts != null) { if (!context.KnownHosts.VerifyHost(transport.Hostname, hostkey)) { Disconnect("Host key not accepted", DisconnectionReason.HOST_KEY_NOT_VERIFIABLE); throw new SSHException("The host key was not accepted", SSHException.CANCELLED_CONNECTION); } } if (!hostkey.VerifySignature(keyexchange.Signature, keyexchange.ExchangeHash)) { Disconnect("The host key signature is invalid", DisconnectionReason.HOST_KEY_NOT_VERIFIABLE); throw new SSHException("The host key signature is invalid", SSHException.PROTOCOL_VIOLATION); } if (sessionIdentifier == null) { sessionIdentifier = keyexchange.ExchangeHash; } packet = GetSSHPacket(true); packet.WriteByte(SSH_MSG_NEWKEYS); #if DEBUG System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_NEWKEYS"); #endif SendMessage(packet); encryption.Init(Cipher.ENCRYPT_MODE, MakeSSHKey('A'), MakeSSHKey('C')); outgoingCipherLength = encryption.BlockSize; outgoingMac.Init(MakeSSHKey('E')); outgoingMacLength = outgoingMac.MacLength; this.encryption = encryption; this.outgoingMac = outgoingMac; do { packet = ReadMessage(); // Process the transport protocol message, must only be // SSH_MSH_INGORE, SSH_MSG_DEBUG, SSH_MSG_DISCONNECT or SSH_MSG_NEWKEYS if (!ProcessMessage(packet)) { Disconnect("Invalid message received during key exchange", DisconnectionReason.PROTOCOL_ERROR); throw new SSHException( "Invalid message received during key exchange", SSHException.PROTOCOL_VIOLATION); } }while(packet.MessageID != SSH_MSG_NEWKEYS); // Put the incoming components into use decryption.Init(Cipher.DECRYPT_MODE, MakeSSHKey('B'), MakeSSHKey('D')); incomingCipherLength = decryption.BlockSize; incomingMac.Init(MakeSSHKey('F')); incomingMacLength = incomingMac.MacLength; this.decryption = decryption; this.incomingMac = incomingMac; //this.incomingCompression = incomingCompression; currentState = TransportProtocolState.CONNECTED; FireStateChange(TransportProtocolState.CONNECTED); lock (kexqueue) { #if DEBUG System.Diagnostics.Trace.WriteLine("Sending queued messages"); #endif for (System.Collections.IEnumerator e = kexqueue.GetEnumerator(); e.MoveNext();) { SendMessage((SSHPacket)e.Current); } kexqueue.Clear(); } // Clean up and reset any parameters localkex = null; remotekex = null; } }
/// <summary> /// Start the authentication request. /// </summary> /// <param name="authentication">The authentication protocol instance.</param> /// <param name="serviceName">The name of the service to start upon a successful authentication.</param> public void Authenticate(AuthenticationProtocol authentication, String serviceName) { if (InteractivePrompt == null) { throw new SSHException("An interactive prompt event must be set!", SSHException.BAD_API_USAGE); } ByteBuffer baw = new ByteBuffer(); baw.WriteString(""); baw.WriteString(""); authentication.SendRequest(username, serviceName, "keyboard-interactive", baw.ToByteArray()); while (true) { SSHPacket msg = authentication.ReadMessage(); if (msg.MessageID != SSH_MSG_USERAUTH_INFO_REQUEST) { authentication.transport.Disconnect("Unexpected authentication message received!", DisconnectionReason.PROTOCOL_ERROR); throw new SSHException("Unexpected authentication message received!", SSHException.PROTOCOL_VIOLATION); } String name = msg.ReadString(); String instruction = msg.ReadString(); String langtag = msg.ReadString(); int num = (int)msg.ReadInt(); String prompt; bool echo; KBIPrompt[] prompts = new KBIPrompt[num]; for (int i = 0; i < num; i++) { prompt = msg.ReadString(); echo = (msg.ReadBool()); prompts[i] = new KBIPrompt(prompt, echo); } if (InteractivePrompt(name, instruction, prompts)) { msg = authentication.transport.GetSSHPacket(true); msg.WriteByte(SSH_MSG_USERAUTH_INFO_RESPONSE); msg.WriteInt(prompts.Length); for (int i = 0; i < prompts.Length; i++) { msg.WriteString(prompts[i].Response); } authentication.transport.SendMessage(msg); } else { throw new SSHException("User cancelled during authentication", SSHException.USER_CANCELATION); } } }
/// <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); } } }