/// <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();
}
}
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>
/// 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);
}
}
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);
}
/// <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>
/// 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);
}
}
}
/// <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);
}
}
}
