public void Start()
{
keyloader = new RSAKeyLoader("keys1024.txt");
TcpListener listener = new TcpListener(IPAddress.Parse(_ip), _port);
listener.Start();
Console.WriteLine("Listener initialized and listening to " + _ip + ":" + _port);
// System.Windows.Forms.MessageBox.Show("Listener initialized and listening to " + _ip + ":" + _port);
new Thread(() =>
{
RemoveExpiredSessions();
}).Start();
while (true)
{
TcpClient client = listener.AcceptTcpClient();
new Thread((cl) =>
{
try
{
NetworkStream networkStream = ((TcpClient)cl).GetStream();
byte[] bytesFrom = new byte[(int)((TcpClient)cl).ReceiveBufferSize];
MemoryStream requestStrm = new MemoryStream();
int bytesread = 0;
byte[] last_bytes = new byte[6];
do
{
bytesread = networkStream.Read(bytesFrom, 0, (int)((TcpClient)cl).ReceiveBufferSize);
requestStrm.Write(bytesFrom, 0, bytesread);
bytesFrom = new byte[(int)((TcpClient)cl).ReceiveBufferSize];
requestStrm.Seek((int)requestStrm.Length - 6, SeekOrigin.Begin);
requestStrm.Read(last_bytes, 0, 6);
requestStrm.Seek(0, SeekOrigin.End);
} while (
last_bytes[0] != 5 ||
last_bytes[1] != 6 ||
last_bytes[2] != 1 ||
last_bytes[3] != 100 ||
last_bytes[4] != 1 ||
last_bytes[5] != 123
);
string request = Encoding.UTF8.GetString(requestStrm.ToArray(), 0, (int)requestStrm.Length - 6);
byte[] sendBytes = new byte[0];
try
{
SN.RequestInfo info = Newtonsoft.Json.JsonConvert.DeserializeObject <SN.RequestInfo>(request);
bool isNewClient = true;
bool clientAuth = false;
bool badtoken = false;
if (info.sid != null)
{
if (SN.Sessions.Current.ContainsKey(info.sid))
{
if (SN.Sessions.Current[info.sid]["session.clientip"] == ((IPEndPoint)((TcpClient)cl).Client.RemoteEndPoint).Address.ToString())
{
if (SN.Sessions.Current[info.sid]["session.authflag"] == true)
{
string base64message = info.tkn;
string[] rsa_numbers = Encoding.ASCII.GetString(Convert.FromBase64String(base64message)).Split(' ');
rsa_numbers = rsa_numbers.Take(rsa_numbers.Count() - 1).ToArray();
string[] aes_token = Encoding.ASCII.GetString(((RSA)SN.Sessions.Current[info.sid]["RSA"]).Decrypt((rsa_numbers))).Split(' ');
if (aes_token[0].Length != 16 || aes_token[1].Length != 16)
{
isNewClient = false;
badtoken = true;
}
else
{
SN.Sessions.Current[info.sid]["AES_KEY"] = aes_token[0];
SN.Sessions.Current[info.sid]["AES_IV"] = aes_token[1];
SN.Sessions.Current[info.sid]["session.authflag"] = false;
sendBytes = System.Text.Encoding.UTF8.GetBytes("ok.");
isNewClient = false;
clientAuth = true;
}
}
else
{
isNewClient = false;
try
{
SN.Sessions.Current[info.sid]["session.activationdate"] = DateTime.Now;
info.msg = Newtonsoft.Json.JsonConvert.DeserializeObject(AES.Decrypt(info.msg, Encoding.ASCII.GetBytes((string)SN.Sessions.Current[info.sid]["AES_KEY"]), Encoding.ASCII.GetBytes((string)SN.Sessions.Current[info.sid]["AES_IV"])));
sendBytes = System.Text.Encoding.UTF8.GetBytes(AES.Encrypt(Newtonsoft.Json.JsonConvert.SerializeObject(SN.InvokeByAttribute.Invoke(info.attr, info)), Encoding.ASCII.GetBytes((string)SN.Sessions.Current[info.sid]["AES_KEY"]), Encoding.ASCII.GetBytes((string)SN.Sessions.Current[info.sid]["AES_IV"])));
clientAuth = true;
}
catch (Exception ex) { Console.WriteLine(ex.Message); }
}
}
}
}
if (isNewClient)
{
string session_id = CreateSession(((IPEndPoint)((TcpClient)cl).Client.RemoteEndPoint).Address.ToString());
ResponseInfo rinfo = new ResponseInfo();
rinfo.rsa_p_key = ((RSA)SN.Sessions.Current[session_id]["RSA"]).GetPublicKey();
rinfo.sid = session_id;
sendBytes = System.Text.Encoding.UTF8.GetBytes(Newtonsoft.Json.JsonConvert.SerializeObject(rinfo));
}
else
{
if (!clientAuth)
{
if (badtoken)
{
sendBytes = System.Text.Encoding.UTF8.GetBytes("Bad Token.");
}
else
{
sendBytes = System.Text.Encoding.UTF8.GetBytes("Authentication error.");
}
}
}
}
catch
{
sendBytes = System.Text.Encoding.UTF8.GetBytes("Protocol error.");
}
MemoryStream resstrm = new MemoryStream();
resstrm.Write(sendBytes, 0, sendBytes.Length);
resstrm.Write(eos, 0, 6);
networkStream.Write(resstrm.ToArray(), 0, (int)resstrm.Length);
networkStream.Flush();
((TcpClient)cl).Close();
}
catch (Exception ex) { Console.WriteLine(ex.Message); }
GC.Collect();
}).Start(client);
}
}