private DataFragment ReceivePacket()
{
while (true)
{
DataFragment data = _packetReceiver.WaitResponse();
PacketType pt = (PacketType)data.ByteAt(0); //shortcut
if (pt == PacketType.SSH_MSG_IGNORE)
{
SSH1DataReader r = new SSH1DataReader(data);
r.ReadPacketType();
if (_eventReceiver != null)
{
_eventReceiver.OnIgnoreMessage(r.ReadString());
}
}
else if (pt == PacketType.SSH_MSG_DEBUG)
{
SSH1DataReader r = new SSH1DataReader(data);
r.ReadPacketType();
if (_eventReceiver != null)
{
_eventReceiver.OnDebugMessage(false, r.ReadString());
}
}
else
{
return(data);
}
}
}
private bool ReceiveAuthenticationResult()
{
DataFragment packet = ReceivePacket();
SSH1DataReader r = new SSH1DataReader(packet);
PacketType type = r.ReadPacketType();
TraceReceptionEvent(type, "user authentication response");
if (type == PacketType.SSH_MSG_DEBUG)
{
//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("unexpected type: " + type);
}
}
/// <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)
{
#if PODEROSA_KEYFORMAT
PrivateKeyLoader loader = new PrivateKeyLoader(path);
loader.LoadSSH1PrivateKey(
passphrase,
out _modulus,
out _publicExponent,
out _privateExponent,
out _primeP,
out _primeQ,
out _crtCoefficient,
out _comment);
#else
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();
_comment = reader.ReadString();
byte[] prvt = reader.GetRemainingDataView().GetBytes();
//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();
#endif
}
/// <summary>
/// Read SSH1 private key parameters.
/// </summary>
/// <param name="passphrase">passphrase for decrypt the key file</param>
/// <param name="modulus">private key parameter</param>
/// <param name="publicExponent">private key parameter</param>
/// <param name="privateExponent">private key parameter</param>
/// <param name="primeP">private key parameter</param>
/// <param name="primeQ">private key parameter</param>
/// <param name="crtCoefficient">private key parameter</param>
/// <exception cref="SSHException">failed to parse</exception>
public void Load(
string passphrase,
out BigInteger modulus,
out BigInteger publicExponent,
out BigInteger privateExponent,
out BigInteger primeP,
out BigInteger primeQ,
out BigInteger crtCoefficient)
{
if (keyFile == null)
{
throw new SSHException("A key file is not loaded yet");
}
byte[] hdr = Encoding.ASCII.GetBytes(PrivateKeyFileHeader.SSH1_HEADER);
if (!ByteArrayUtil.ByteArrayStartsWith(keyFile, hdr))
{
throw new SSHException(Strings.GetString("NotValidPrivateKeyFile"));
}
SSH1DataReader reader = new SSH1DataReader(keyFile);
reader.Read(hdr.Length);
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, SSH1PassphraseToKey(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();
}
/// <summary>
/// Process forwarded message.
/// </summary>
/// <param name="message">a forwarded message</param>
private void ProcessMessage(DataFragment message)
{
if (_authKeyProvider == null || !_authKeyProvider.IsAuthKeyProviderEnabled)
{
SendFailure();
return;
}
SSH1DataReader reader = new SSH1DataReader(message);
OpenSSHAgentForwardingMessageType messageType = (OpenSSHAgentForwardingMessageType)reader.ReadByte();
switch (messageType)
{
// for SSH1 keys
case OpenSSHAgentForwardingMessageType.SSH_AGENTC_REQUEST_RSA_IDENTITIES:
SSH1Identities();
break;
case OpenSSHAgentForwardingMessageType.SSH_AGENTC_RSA_CHALLENGE: {
reader.ReadUInt32(); // ignored
BigInteger e = reader.ReadMPInt();
BigInteger n = reader.ReadMPInt();
BigInteger encryptedChallenge = reader.ReadMPInt();
byte[] sessionId = reader.Read(16);
uint responseType = reader.ReadUInt32();
SSH1IRSAChallenge(e, n, encryptedChallenge, sessionId, responseType);
}
break;
// for SSH2 keys
case OpenSSHAgentForwardingMessageType.SSH2_AGENTC_REQUEST_IDENTITIES:
SSH2Identities();
break;
case OpenSSHAgentForwardingMessageType.SSH2_AGENTC_SIGN_REQUEST: {
byte[] blob = reader.ReadByteString();
byte[] data = reader.ReadByteString();
uint flags = reader.ReadUInt32();
SSH2Sign(blob, data, flags);
}
break;
default:
SendFailure();
break;
}
}
//RSA authentication
private void DoRSAChallengeResponse()
{
//read key
SSH1UserAuthKey key = new SSH1UserAuthKey(_param.IdentityFile, _param.Password);
SSH1DataWriter w = new SSH1DataWriter();
w.WriteBigInteger(key.PublicModulus);
SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_AUTH_RSA, w.ToByteArray());
p.WriteTo(_stream, _tCipher);
TraceTransmissionEvent(PacketType.SSH_CMSG_AUTH_RSA, "RSA challenge-reponse");
DataFragment response = ReceivePacket();
SSH1DataReader reader = new SSH1DataReader(response);
PacketType pt = reader.ReadPacketType();
if (pt == PacketType.SSH_SMSG_FAILURE)
{
throw new SSHException(Strings.GetString("ServerRefusedRSA"));
}
else if (pt != PacketType.SSH_SMSG_AUTH_RSA_CHALLENGE)
{
throw new SSHException(String.Format(Strings.GetString("UnexpectedResponse"), pt));
}
TraceReceptionEvent(PacketType.SSH_SMSG_AUTH_RSA_CHALLENGE, "received challenge");
//creating challenge
BigInteger challenge = key.decryptChallenge(reader.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[] reply = new MD5CryptoServiceProvider().ComputeHash(bos.ToArray());
w = new SSH1DataWriter();
w.Write(reply);
p = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_AUTH_RSA_RESPONSE, w.ToByteArray());
p.WriteTo(_stream, _tCipher);
TraceReceptionEvent(PacketType.SSH_CMSG_AUTH_RSA_RESPONSE, "received response");
}
internal void AsyncReceivePacket(DataFragment data)
{
try {
int len = 0, channel = 0;
SSH1DataReader re = new SSH1DataReader(data);
PacketType pt = re.ReadPacketType();
switch (pt)
{
case PacketType.SSH_SMSG_STDOUT_DATA:
len = re.ReadInt32();
_channel_collection.FindChannelEntry(_shellID).Receiver.OnData(re.Image, re.Offset, len);
break;
case PacketType.SSH_SMSG_STDERR_DATA: {
_channel_collection.FindChannelEntry(_shellID).Receiver.OnExtendedData((int)PacketType.SSH_SMSG_STDERR_DATA, re.ReadString());
}
break;
case PacketType.SSH_MSG_CHANNEL_DATA:
channel = re.ReadInt32();
len = re.ReadInt32();
_channel_collection.FindChannelEntry(channel).Receiver.OnData(re.Image, re.Offset, len);
break;
case PacketType.SSH_MSG_PORT_OPEN:
ProcessPortforwardingRequest(_eventReceiver, re);
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE: {
channel = re.ReadInt32();
ISSHChannelEventReceiver r = _channel_collection.FindChannelEntry(channel).Receiver;
_channel_collection.UnregisterChannelEventReceiver(channel);
r.OnChannelClosed();
}
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE_CONFIRMATION:
channel = re.ReadInt32();
break;
case PacketType.SSH_MSG_DISCONNECT:
_eventReceiver.OnConnectionClosed();
break;
case PacketType.SSH_SMSG_EXITSTATUS:
_channel_collection.FindChannelEntry(_shellID).Receiver.OnChannelClosed();
break;
case PacketType.SSH_MSG_DEBUG:
_eventReceiver.OnDebugMessage(false, re.ReadString());
break;
case PacketType.SSH_MSG_IGNORE:
_eventReceiver.OnIgnoreMessage(re.ReadString());
break;
case PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION: {
int local = re.ReadInt32();
int remote = re.ReadInt32();
_channel_collection.FindChannelEntry(local).Receiver.OnChannelReady();
}
break;
case PacketType.SSH_SMSG_SUCCESS:
if (_executingShell)
{
ExecShell();
_channel_collection.FindChannelEntry(_shellID).Receiver.OnChannelReady();
_executingShell = false;
}
break;
default:
_eventReceiver.OnUnknownMessage((byte)pt, re.ReadAll());
break;
}
}
catch (Exception ex) {
_eventReceiver.OnError(ex);
}
}
private void ProcessPortforwardingRequest(ISSHConnectionEventReceiver receiver, SSH1DataReader reader)
{
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 = _channel_collection.RegisterChannelEventReceiver(null, result.channel).LocalID;
_eventReceiver.EstablishPortforwarding(result.channel, new SSH1Channel(this, ChannelType.ForwardedRemoteToLocal, local_id, server_channel));
writer.WriteInt32(server_channel);
writer.WriteInt32(local_id);
SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION, writer.ToByteArray());
p.WriteTo(_stream, _tCipher);
}
else
{
writer.WriteInt32(server_channel);
SSH1Packet p = SSH1Packet.FromPlainPayload(PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE, writer.ToByteArray());
p.WriteTo(_stream, _tCipher);
}
}
private void ReceiveServerKeys()
{
DataFragment packet = ReceivePacket();
SSH1DataReader reader = new SSH1DataReader(packet);
PacketType pt = reader.ReadPacketType();
if (pt != PacketType.SSH_SMSG_PUBLIC_KEY)
{
throw new SSHException("unexpected SSH SSH1Packet type " + pt, reader.ReadAll());
}
_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", reader.ReadAll());
}
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")), reader.ReadAll());
}
if (_param.AuthenticationType == AuthenticationType.PublicKey && (supported_authentications_mask & (1 << (int)AuthenticationType.PublicKey)) == 0)
{
throw new SSHException(String.Format(Strings.GetString("ServerNotSupportedRSA")), reader.ReadAll());
}
TraceReceptionEvent(pt, "received server key");
}
/// <summary>
/// Process packet about this channel.
/// </summary>
/// <param name="packetType">a packet type (message number)</param>
/// <param name="packetFragment">a packet image except message number and recipient channel.</param>
public override void ProcessPacket(SSH1PacketType packetType, DataFragment packetFragment)
{
if (_state == State.Closed)
{
return; // ignore
}
DataFragment dataFragmentArg;
lock (_stateSync) {
switch (_state)
{
case State.Initial:
break;
case State.WaitStartPTYResponse:
if (packetType == SSH1PacketType.SSH_SMSG_SUCCESS)
{
_state = State.StartPTYSuccess;
Monitor.PulseAll(_stateSync); // notifies state change
_receivedPacket.TrySet(packetFragment, PASSING_TIMEOUT);
}
else if (packetType == SSH1PacketType.SSH_SMSG_FAILURE)
{
_state = State.StartPTYFailure;
Monitor.PulseAll(_stateSync); // notifies state change
_receivedPacket.TrySet(packetFragment, PASSING_TIMEOUT);
}
break;
case State.Established:
break;
case State.Ready:
switch (packetType)
{
case SSH1PacketType.SSH_SMSG_STDOUT_DATA: {
SSH1DataReader reader = new SSH1DataReader(packetFragment);
int len = reader.ReadInt32();
dataFragmentArg = reader.GetRemainingDataView(len);
}
goto OnData; // do it out of the lock block
case SSH1PacketType.SSH_SMSG_STDERR_DATA: {
SSH1DataReader reader = new SSH1DataReader(packetFragment);
int len = reader.ReadInt32();
dataFragmentArg = reader.GetRemainingDataView(len);
}
goto OnData; // do it out of the lock block
case SSH1PacketType.SSH_SMSG_EXITSTATUS:
Transmit(
new SSH1Packet(SSH1PacketType.SSH_CMSG_EXIT_CONFIRMATION)
);
goto SetStateClosedByServer; // do it out of the lock block
}
goto OnUnhandledPacket; // do it out of the lock block
}
}
return;
OnData:
Handler.OnData(dataFragmentArg);
return;
SetStateClosedByServer:
Trace("CH[{0}] closed by server", LocalChannel);
SetStateClosed(true);
return;
OnUnhandledPacket:
Handler.OnUnhandledPacket((byte)packetType, packetFragment);
return;
}
/// <summary>
/// Process packet about this channel.
/// </summary>
/// <param name="packetType">a packet type (message number)</param>
/// <param name="packetFragment">a packet image except message number and recipient channel.</param>
public override void ProcessPacket(SSH1PacketType packetType, DataFragment packetFragment)
{
if (_state == State.Closed)
{
return; // ignore
}
DataFragment dataFragmentArg;
lock (_stateSync) {
switch (_state)
{
case State.InitiatedByServer:
break;
case State.InitiatedByClient:
if (packetType == SSH1PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION)
{
SSH1DataReader reader = new SSH1DataReader(packetFragment);
SetRemoteChannel(reader.ReadUInt32());
_state = State.Established;
Monitor.PulseAll(_stateSync); // notifies state change
dataFragmentArg = new DataFragment(0);
goto OnEstablished; // do it out of the lock block
}
if (packetType == SSH1PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
{
goto RequestFailed; // do it out of the lock block
}
break;
case State.Closing:
if (packetType == SSH1PacketType.SSH_MSG_CHANNEL_CLOSE_CONFIRMATION)
{
goto SetStateClosedByClient; // do it out of the lock block
}
break;
case State.Established:
case State.Ready:
if (ProcessPacketSub(packetType, packetFragment) == SubPacketProcessResult.Consumed)
{
return;
}
switch (packetType)
{
case SSH1PacketType.SSH_MSG_CHANNEL_DATA: {
SSH1DataReader reader = new SSH1DataReader(packetFragment);
int len = reader.ReadInt32();
dataFragmentArg = reader.GetRemainingDataView(len);
}
goto OnData; // do it out of the lock block
case SSH1PacketType.SSH_MSG_CHANNEL_CLOSE:
Transmit(
new SSH1Packet(SSH1PacketType.SSH_MSG_CHANNEL_CLOSE_CONFIRMATION)
.WriteUInt32(RemoteChannel)
);
goto SetStateClosedByServer; // do it out of the lock block
}
goto OnUnhandledPacket; // do it out of the lock block
}
}
return;
OnEstablished:
Trace("CH[{0}] channel opend : remoteChannel={1}", LocalChannel, RemoteChannel);
Handler.OnEstablished(dataFragmentArg);
OnChannelEstablished();
return;
RequestFailed:
Trace("CH[{0}] request failed", LocalChannel);
RequestFailed();
return;
SetStateClosedByClient:
Trace("CH[{0}] closed by client", LocalChannel);
SetStateClosed(false);
return;
SetStateClosedByServer:
Trace("CH[{0}] closed by server", LocalChannel);
SetStateClosed(true);
return;
OnData:
Handler.OnData(dataFragmentArg);
return;
OnUnhandledPacket:
Handler.OnUnhandledPacket((byte)packetType, packetFragment);
return;
}
