public static void Main(string[] args)
{
if (args.Length < 1 || (args[0] != "client" && args[0] != "keygen"))
{
System.Console.WriteLine("Usage: proxy <server|client|keygen> [options...]");
return;
}
switch (args[0])
{
case "client":
if (args.Length < 4)
{
Console.WriteLine("Usage: proxy client <keyPath> <port> <remoteHost> <remotePort>");
return;
}
break;
}
if (args[0] == "keygen")
{
Random r = new Random();
byte[] randomNums = new byte[16];
r.NextBytes(randomNums);
System.Console.WriteLine(BitConverter.ToString(randomNums).Replace("-", String.Empty));
return;
}
var exitEvent = new ManualResetEvent(false);
Console.CancelKeyPress += (sender, eventArgs) => {
eventArgs.Cancel = true;
exitEvent.Set();
};
StreamReader reader = new StreamReader(args[1]);
byte[] key = Encoding.UTF8.GetBytes(reader.ReadToEnd());
var Client = new TLSHandshakeClient(Int16.Parse(args[4]), args[3], Int16.Parse(args[2]), key);
System.Console.WriteLine("Listening on port " + args[2]);
Client.start();
}
async void AsyncTcpProcess(object o)
{
TcpClient tc = (TcpClient)o;
NetworkStream stream = tc.GetStream();
byte[] outBuf = new byte[1024];
int numBytesRead = 0;
string ipAddr;
int port;
byte[] buff;
System.Console.WriteLine("Socket connection established");
int fd = (int)tc.Client.Handle;
if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
addr_type peerAddr = get_peer_name(fd);
if (peerAddr.port == -1)
{
throw new Exception();
}
string ip = TLSHandshakeClient.ParseIP(peerAddr.ip);
var originalAddr = TLSHandshakeClient.GetOriginalAddrMach(ip, peerAddr.port);
ipAddr = originalAddr.ip;
port = originalAddr.port;
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
addr_type originalAddr = get_original_addr(fd);
if (originalAddr.port == -1)
{
throw new Exception();
}
ipAddr = TLSHandshakeClient.ParseIP(originalAddr.ip);
port = originalAddr.port;
}
else
{
System.Console.WriteLine("OS Not supported!");
return;
}
int nBytes = 0;
using (var ms = new MemoryStream()) {
while (stream.DataAvailable && (numBytesRead = stream.Read(outBuf, 0, outBuf.Length)) > 0)
{
ms.Write(outBuf, 0, outBuf.Length);
nBytes += numBytesRead;
System.Console.WriteLine(numBytesRead);
}
buff = ms.ToArray();
}
System.Console.WriteLine(BitConverter.ToString(buff).Replace("-", " "));
if (nBytes <= 0)
{
return;
}
if (buff[0] == 0x16) // TLS Handshake packet
{
System.Console.WriteLine("Handshake");
var rand = new Random();
byte[] iv = new byte[16];
rand.NextBytes(iv);
byte[] encryptedData = SecurityModule.AESDecrypt256(buff, this.key, iv);
string bodyString = $"{ipAddr}|{port}|{Convert.ToBase64String(encryptedData)}";
byte[] encryptedInput, decryptedInput;
encryptedInput = await PostData($"http://{remoteIpAddr}:{remotePort}/tls", bodyString);
System.Console.WriteLine($"Received {encryptedInput.Length} bytes");
decryptedInput = SecurityModule.AESDecrypt256(encryptedInput, key, iv);
stream.Write(decryptedInput, 0, decryptedInput.Length);
}
else // IDK just bypass it
{
System.Console.WriteLine($"Normal Packet: Initiating connection to {ipAddr}:{port}");
TcpClient bypass = new TcpClient(ipAddr, port);
NetworkStream bypassStream = bypass.GetStream();
System.Console.WriteLine($"Writing {nBytes} bytes to stream");
bypassStream.Write(buff, 0, nBytes);
while (bypassStream.DataAvailable && (numBytesRead = bypassStream.Read(outBuf, 0, outBuf.Length)) > 0)
{
stream.Write(outBuf, 0, numBytesRead);
System.Console.WriteLine(bypassStream.DataAvailable);
}
System.Console.WriteLine("Normal Stream Closed");
}
stream.Flush();
stream.Close();
tc.Close();
}
