private void ProcessKEXINIT(DataFragment packet) {
SSH2DataReader re = null;
do {
_serverKEXINITPayload = packet.ToNewArray();
re = new SSH2DataReader(_serverKEXINITPayload);
byte[] head = re.Read(17); //Type and cookie
PacketType pt = (PacketType)head[0];
if(pt==PacketType.SSH_MSG_KEXINIT)
break; //successfully exit
else if(pt==PacketType.SSH_MSG_IGNORE || pt==PacketType.SSH_MSG_DEBUG) { //continue
packet = _connection.ReceivePacket();
}
else
throw new SSHException(String.Format("Server response is not SSH_MSG_KEXINIT but {0}", head[0]));
} while(true);
Encoding enc = Encoding.ASCII;
string kex = enc.GetString(re.ReadString());
_cInfo._supportedKEXAlgorithms = kex;
CheckAlgorithmSupport("keyexchange", kex, "diffie-hellman-group1-sha1");
string host_key = enc.GetString(re.ReadString());
_cInfo._supportedHostKeyAlgorithms = host_key;
_cInfo._algorithmForHostKeyVerification = DecideHostKeyAlgorithm(host_key);
string enc_cs = enc.GetString(re.ReadString());
_cInfo._supportedCipherAlgorithms = enc_cs;
_cInfo._algorithmForTransmittion = DecideCipherAlgorithm(enc_cs);
string enc_sc = enc.GetString(re.ReadString());
_cInfo._algorithmForReception = DecideCipherAlgorithm(enc_sc);
string mac_cs = enc.GetString(re.ReadString());
CheckAlgorithmSupport("mac", mac_cs, "hmac-sha1");
string mac_sc = enc.GetString(re.ReadString());
CheckAlgorithmSupport("mac", mac_sc, "hmac-sha1");
string comp_cs = enc.GetString(re.ReadString());
CheckAlgorithmSupport("compression", comp_cs, "none");
string comp_sc = enc.GetString(re.ReadString());
CheckAlgorithmSupport("compression", comp_sc, "none");
string lang_cs = enc.GetString(re.ReadString());
string lang_sc = enc.GetString(re.ReadString());
bool flag = re.ReadBool();
int reserved = re.ReadInt32();
Debug.Assert(re.Rest==0);
if(_connection.IsEventTracerAvailable) {
StringBuilder bld = new StringBuilder();
bld.Append("kex_algorithm="); bld.Append(kex);
bld.Append("; server_host_key_algorithms="); bld.Append(host_key);
bld.Append("; encryption_algorithms_client_to_server="); bld.Append(enc_cs);
bld.Append("; encryption_algorithms_server_to_client="); bld.Append(enc_sc);
bld.Append("; mac_algorithms_client_to_server="); bld.Append(mac_cs);
bld.Append("; mac_algorithms_server_to_client="); bld.Append(mac_sc);
bld.Append("; comression_algorithms_client_to_server="); bld.Append(comp_cs);
bld.Append("; comression_algorithms_server_to_client="); bld.Append(comp_sc);
TraceReceptionNegotiation(PacketType.SSH_MSG_KEXINIT, bld.ToString());
}
if(flag) throw new SSHException("Algorithm negotiation failed");
}
/// <summary>
/// Reads a multiple precision integer.
/// </summary>
/// <returns>a multiple precision integer</returns>
private BigInteger ReadBigIntWithBits(SSH2DataReader reader)
{
int bits = reader.ReadInt32();
int bytes = (bits + 7) / 8;
byte[] biData = reader.Read(bytes);
return new BigInteger(biData);
}
private void ProcessKEXINIT(DataFragment packet)
{
SSH2DataReader re = null;
do {
_serverKEXINITPayload = packet.GetBytes();
re = new SSH2DataReader(_serverKEXINITPayload);
byte[] head = re.Read(17); //Type and cookie
SSH2PacketType pt = (SSH2PacketType)head[0];
if (pt == SSH2PacketType.SSH_MSG_KEXINIT)
break; //successfully exit
if (pt == SSH2PacketType.SSH_MSG_IGNORE || pt == SSH2PacketType.SSH_MSG_DEBUG) { //continue
packet = _connection.ReceivePacket();
}
else {
throw new SSHException(String.Format("Server response is not SSH_MSG_KEXINIT but {0}", head[0]));
}
} while (true);
string kex = re.ReadString();
_cInfo.SupportedKEXAlgorithms = kex;
_cInfo.KEXAlgorithm = DecideKexAlgorithm(kex);
string host_key = re.ReadString();
_cInfo.SupportedHostKeyAlgorithms = host_key;
_cInfo.HostKeyAlgorithm = DecideHostKeyAlgorithm(host_key);
string enc_cs = re.ReadString();
_cInfo.SupportedEncryptionAlgorithmsClientToServer = enc_cs;
_cInfo.OutgoingPacketCipher = DecideCipherAlgorithm(enc_cs);
string enc_sc = re.ReadString();
_cInfo.SupportedEncryptionAlgorithmsServerToClient = enc_sc;
_cInfo.IncomingPacketCipher = DecideCipherAlgorithm(enc_sc);
string mac_cs = re.ReadString();
CheckAlgorithmSupport("mac", mac_cs, "hmac-sha1");
string mac_sc = re.ReadString();
CheckAlgorithmSupport("mac", mac_sc, "hmac-sha1");
string comp_cs = re.ReadString();
CheckAlgorithmSupport("compression", comp_cs, "none");
string comp_sc = re.ReadString();
CheckAlgorithmSupport("compression", comp_sc, "none");
string lang_cs = re.ReadString();
string lang_sc = re.ReadString();
bool flag = re.ReadBool();
int reserved = re.ReadInt32();
Debug.Assert(re.RemainingDataLength == 0);
if (_connection.IsEventTracerAvailable) {
StringBuilder bld = new StringBuilder();
bld.Append("kex_algorithm=");
bld.Append(kex);
bld.Append("; server_host_key_algorithms=");
bld.Append(host_key);
bld.Append("; encryption_algorithms_client_to_server=");
bld.Append(enc_cs);
bld.Append("; encryption_algorithms_server_to_client=");
bld.Append(enc_sc);
bld.Append("; mac_algorithms_client_to_server=");
bld.Append(mac_cs);
bld.Append("; mac_algorithms_server_to_client=");
bld.Append(mac_sc);
bld.Append("; comression_algorithms_client_to_server=");
bld.Append(comp_cs);
bld.Append("; comression_algorithms_server_to_client=");
bld.Append(comp_sc);
TraceReceptionNegotiation(SSH2PacketType.SSH_MSG_KEXINIT, bld.ToString());
}
if (flag)
throw new SSHException("Algorithm negotiation failed");
}