public byte[] ProcessChallenge(byte[] Challenge)
{
byte[] bytes;
RdpPacket packet = new RdpPacket();
this.m_ChallengeMsg = Challenge;
packet.Write(Challenge, 0, Challenge.Length);
packet.Position = 0L;
long position = packet.Position;
if (packet.ReadString(8) != "NTLMSSP\0")
{
throw new Exception("Invalid negotiation token!");
}
if (packet.getLittleEndian32() != 2)
{
throw new Exception("Expected challenge!");
}
int count = packet.getLittleEndian16();
packet.getLittleEndian16();
int num4 = packet.getLittleEndian32();
uint flags = (uint)packet.getLittleEndian32();
DumpFlags(flags);
byte[] buffer = new byte[8];
packet.Read(buffer, 0, 8);
byte[] buffer2 = new byte[8];
packet.Read(buffer2, 0, 8);
int num5 = packet.getLittleEndian16();
packet.getLittleEndian16();
int num6 = packet.getLittleEndian32();
if ((flags & 0x2000000) != 0)
{
byte[] buffer3 = new byte[8];
packet.Read(buffer3, 0, 8);
}
if ((flags & 0x20000000) == 0)
{
throw new Exception("Strong Encryption not supported by server");
}
byte[] buffer4 = null;
if (count > 0)
{
buffer4 = new byte[count];
packet.Position = position + num4;
packet.Read(buffer4, 0, count);
Encoding.Unicode.GetString(buffer4, 0, buffer4.Length);
}
AV_PAIRS av_pairs = new AV_PAIRS();
byte[] buffer5 = null;
if (num5 <= 0)
{
throw new Exception("No TargetInfo!");
}
packet.Position = position + num6;
buffer5 = new byte[num5];
packet.Read(buffer5, 0, num5);
packet = new RdpPacket();
packet.Write(buffer5, 0, buffer5.Length);
packet.Position = 0L;
av_pairs.Parse(packet);
byte[] data = nTOWFv2(this.m_sDomain, this.m_sUsername, this.m_sPassword);
m_Socket.AddBlob(PacketLogger.PacketType.NTLM_ResponseKeyNT, data);
byte[] blob = new byte[8];
RNGCryptoServiceProvider provider = new RNGCryptoServiceProvider();
provider.GetBytes(blob);
m_Socket.AddBlob(PacketLogger.PacketType.NTLM_ClientChallenge, blob);
byte[] buffer8 = getLMv2Response(data, buffer, blob);
if (this.m_bNTLMv2)
{
Array.Clear(buffer8, 0, buffer8.Length);
}
bool bGenerateMIC = false;
if ((av_pairs.Timestamp.length <= 0) || !this.m_bNTLMv2)
{
bytes = BitConverter.GetBytes(DateTime.UtcNow.ToFileTimeUtc());
}
else
{
bytes = av_pairs.Timestamp.value;
bGenerateMIC = true;
av_pairs.ProcessForNTLMv2();
buffer5 = av_pairs.Serialise();
}
byte[] keyExchangeKey = null;
byte[] buffer11 = getNTLMv2Response(data, buffer, blob, bytes, buffer5, out keyExchangeKey);
m_Socket.AddBlob(PacketLogger.PacketType.NTLM_KeyExchangeKey, keyExchangeKey);
byte[] encryptedRandomSessionKey = null;
byte[] buffer13 = null;
buffer13 = new byte[0x10];
provider.GetBytes(buffer13);
m_Socket.AddBlob(PacketLogger.PacketType.NTLM_ExportedSessionKey, buffer13);
encryptedRandomSessionKey = new byte[0x10];
RC4 rc = new RC4();
rc.engineInitEncrypt(keyExchangeKey);
encryptedRandomSessionKey = rc.crypt(buffer13);
if ((flags & 0x40000000) == 0)
{
encryptedRandomSessionKey = new byte[0];
buffer13 = keyExchangeKey;
}
this.InitSignKeys(buffer13);
return(this.Authenticate(buffer8, buffer11, this.m_sDomain, this.m_sUsername, this.m_sWorkstation, encryptedRandomSessionKey, buffer13, bGenerateMIC));
}
