private void ProcessPortforwardingRequest(ISSHConnectionEventReceiver receiver, SSH1Packet packet)
{
SSH1DataReader reader = new SSH1DataReader(packet.Data);
int server_channel = reader.ReadInt32();
string host = Encoding.ASCII.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);
}
}
/// <summary>
/// constructs from file
/// </summary>
/// <param name="path">file name</param>
/// <param name="passphrase">passphrase or empty string if passphrase is not required</param>
public SSH1UserAuthKey(string path, string passphrase)
{
Stream s = File.Open(path, FileMode.Open);
byte[] header = new byte[32];
s.Read(header, 0, header.Length);
if (Encoding.ASCII.GetString(header) != "SSH PRIVATE KEY FILE FORMAT 1.1\n")
{
throw new SSHException(String.Format(Strings.GetString("BrokenKeyFile"), path));
}
SSH1DataReader reader = new SSH1DataReader(ReadAll(s));
s.Close();
byte[] cipher = reader.Read(2); //first 2 bytes indicates algorithm and next 8 bytes is space
reader.Read(8);
_modulus = reader.ReadMPInt();
_publicExponent = reader.ReadMPInt();
byte[] comment = reader.ReadString();
byte[] prvt = reader.ReadAll();
//必要なら復号
CipherAlgorithm algo = (CipherAlgorithm)cipher[1];
if (algo != 0)
{
Cipher c = CipherFactory.CreateCipher(SSHProtocol.SSH1, algo, ConvertToKey(passphrase));
byte[] buf = new byte[prvt.Length];
c.Decrypt(prvt, 0, prvt.Length, buf, 0);
prvt = buf;
}
SSH1DataReader prvtreader = new SSH1DataReader(prvt);
byte[] mark = prvtreader.Read(4);
if (mark[0] != mark[2] || mark[1] != mark[3])
{
throw new SSHException(Strings.GetString("WrongPassphrase"));
}
_privateExponent = prvtreader.ReadMPInt();
_crtCoefficient = prvtreader.ReadMPInt();
_primeP = prvtreader.ReadMPInt();
_primeQ = prvtreader.ReadMPInt();
}
private SSH1Packet ReceivePacket()
{
while (true)
{
SSH1Packet p = null;
SynchronizedSSH1PacketHandler handler = (SynchronizedSSH1PacketHandler)_packetBuilder.Handler;
if (!handler.HasPacket)
{
handler.Wait();
if (handler.State == ReceiverState.Error)
{
throw new SSHException(handler.ErrorMessage);
}
else if (handler.State == ReceiverState.Closed)
{
throw new SSHException("socket closed");
}
}
p = handler.PopPacket();
SSH1DataReader r = new SSH1DataReader(p.Data);
PacketType pt = p.Type;
if (pt == PacketType.SSH_MSG_IGNORE)
{
if (_eventReceiver != null)
{
_eventReceiver.OnIgnoreMessage(r.ReadString());
}
}
else if (pt == PacketType.SSH_MSG_DEBUG)
{
if (_eventReceiver != null)
{
_eventReceiver.OnDebugMessage(false, r.ReadString());
}
}
else
{
return(p);
}
}
}
//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 bool ReceiveAuthenticationResult()
{
SSH1Packet SSH1Packet = ReceivePacket();
PacketType type = SSH1Packet.Type;
if (type == PacketType.SSH_MSG_DEBUG)
{
SSH1DataReader r = new SSH1DataReader(SSH1Packet.Data);
//Debug.WriteLine("receivedd debug message:"+Encoding.ASCII.GetString(r.ReadString()));
return(ReceiveAuthenticationResult());
}
else if (type == PacketType.SSH_SMSG_SUCCESS)
{
return(true);
}
else if (type == PacketType.SSH_SMSG_FAILURE)
{
return(false);
}
else
{
throw new SSHException("type: " + type, SSH1Packet.Data);
}
}
internal void AsyncReceivePacket(SSH1Packet p)
{
try {
int len = 0, channel = 0;
switch (p.Type)
{
case PacketType.SSH_SMSG_STDOUT_DATA:
len = SSHUtil.ReadInt32(p.Data, 0);
FindChannelEntry(_shellID)._receiver.OnData(p.Data, 4, len);
break;
case PacketType.SSH_SMSG_STDERR_DATA: {
SSH1DataReader re = new SSH1DataReader(p.Data);
FindChannelEntry(_shellID)._receiver.OnExtendedData((int)PacketType.SSH_SMSG_STDERR_DATA, re.ReadString());
}
break;
case PacketType.SSH_MSG_CHANNEL_DATA:
channel = SSHUtil.ReadInt32(p.Data, 0);
len = SSHUtil.ReadInt32(p.Data, 4);
FindChannelEntry(channel)._receiver.OnData(p.Data, 8, len);
break;
case PacketType.SSH_MSG_PORT_OPEN:
this.ProcessPortforwardingRequest(_eventReceiver, p);
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE: {
channel = SSHUtil.ReadInt32(p.Data, 0);
ISSHChannelEventReceiver r = FindChannelEntry(channel)._receiver;
UnregisterChannelEventReceiver(channel);
r.OnChannelClosed();
}
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE_CONFIRMATION:
channel = SSHUtil.ReadInt32(p.Data, 0);
break;
case PacketType.SSH_MSG_DISCONNECT:
_eventReceiver.OnConnectionClosed();
break;
case PacketType.SSH_SMSG_EXITSTATUS:
FindChannelEntry(_shellID)._receiver.OnChannelClosed();
break;
case PacketType.SSH_MSG_DEBUG: {
SSH1DataReader re = new SSH1DataReader(p.Data);
_eventReceiver.OnDebugMessage(false, re.ReadString());
}
break;
case PacketType.SSH_MSG_IGNORE: {
SSH1DataReader re = new SSH1DataReader(p.Data);
_eventReceiver.OnIgnoreMessage(re.ReadString());
}
break;
case PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION: {
int local = SSHUtil.ReadInt32(p.Data, 0);
int remote = SSHUtil.ReadInt32(p.Data, 4);
FindChannelEntry(local)._receiver.OnChannelReady();
}
break;
case PacketType.SSH_SMSG_SUCCESS:
if (_executingShell)
{
ExecShell();
this.FindChannelEntry(_shellID)._receiver.OnChannelReady();
_executingShell = false;
}
break;
default:
_eventReceiver.OnUnknownMessage((byte)p.Type, p.Data);
break;
}
}
catch (Exception ex) {
if (!_closed)
{
_eventReceiver.OnError(ex, ex.Message);
}
}
}
private void ReceiveServerKeys()
{
SSH1Packet SSH1Packet = ReceivePacket();
if (SSH1Packet.Type != PacketType.SSH_SMSG_PUBLIC_KEY)
{
throw new SSHException("unexpected SSH SSH1Packet type " + SSH1Packet.Type, SSH1Packet.Data);
}
SSH1DataReader reader = new SSH1DataReader(SSH1Packet.Data);
_cInfo._serverinfo = new SSHServerInfo(reader);
_cInfo._hostkey = new RSAPublicKey(_cInfo._serverinfo.host_key_public_exponent, _cInfo._serverinfo.host_key_public_modulus);
//read protocol support parameters
int protocol_flags = reader.ReadInt32();
int supported_ciphers_mask = reader.ReadInt32();
_cInfo.SetSupportedCipherAlgorithms(supported_ciphers_mask);
int supported_authentications_mask = reader.ReadInt32();
//Debug.WriteLine(String.Format("ServerOptions {0} {1} {2}", protocol_flags, supported_ciphers_mask, supported_authentications_mask));
if (reader.Rest > 0)
{
throw new SSHException("data length mismatch", SSH1Packet.Data);
}
//Debug Info
/*
* System.out.println("Flags="+protocol_flags);
* System.out.println("Cipher="+supported_ciphers_mask);
* System.out.println("Auth="+supported_authentications_mask);
*/
bool found = false;
foreach (CipherAlgorithm a in _param.PreferableCipherAlgorithms)
{
if (a != CipherAlgorithm.Blowfish && a != CipherAlgorithm.TripleDES)
{
continue;
}
else if (a == CipherAlgorithm.Blowfish && (supported_ciphers_mask & (1 << (int)CipherAlgorithm.Blowfish)) == 0)
{
continue;
}
else if (a == CipherAlgorithm.TripleDES && (supported_ciphers_mask & (1 << (int)CipherAlgorithm.TripleDES)) == 0)
{
continue;
}
_cInfo._algorithmForReception = _cInfo._algorithmForTransmittion = a;
found = true;
break;
}
if (!found)
{
throw new SSHException(String.Format(Strings.GetString("ServerNotSupportedX"), "Blowfish/TripleDES"));
}
if (_param.AuthenticationType == AuthenticationType.Password && (supported_authentications_mask & (1 << (int)AuthenticationType.Password)) == 0)
{
throw new SSHException(String.Format(Strings.GetString("ServerNotSupportedPassword")), SSH1Packet.Data);
}
if (_param.AuthenticationType == AuthenticationType.PublicKey && (supported_authentications_mask & (1 << (int)AuthenticationType.PublicKey)) == 0)
{
throw new SSHException(String.Format(Strings.GetString("ServerNotSupportedRSA")), SSH1Packet.Data);
}
}