/// <summary>
/// Metoda sluzaca do logowanie klienta
/// </summary>
/// <param name="login"></param>
/// <param name="password"></param>
/// <param name="n"></param>
/// <returns></returns>
public bool LogClient(string login, byte[] password, int n)
{
foreach (Client client in database)
{
if (login == client.login)
{
string pass = null;
foreach (byte b in password)
{
pass += (b.ToString() + " ");
}
--n;
byte[] hash = CryptoModule.HashNTimes(client.passwordHash, n);
string h = null;
foreach (byte b in hash)
{
h += (b.ToString() + " ");
}
if (h.Equals(pass))
{
Console.WriteLine("LOG: Logged {0}", login);
client.isOnline = true;
return(true);
}
}
}
return(false);
}
/// <summary>
/// Konstruktor
/// </summary>
/// <param name="login"></param>
/// <param name="password"></param>
/// <param name="pesel"></param>
public Client(string login, byte[] password, byte[] pesel)
{
this.login = login;
passwordHash = password;
peselHash = pesel;
n = 1;
generator = new Random();
isOnline = false;
isRunning = false;
isConnected = false;
certificate = CryptoModule.GenerateCeriticate(login);
}
/// <summary>
/// Metoda umozliwiajaca pobranie certyfikatu
/// </summary>
/// <param name="login"></param>
/// <returns></returns>
public X509Certificate2 GetCertificate(string login)
{
X509Certificate2 certificate = CryptoModule.GenerateCeriticate(login);
foreach (Client c in database)
{
if (c.login == login)
{
c.certificate = certificate;
return(c.certificate);
}
}
X509Certificate2 wrong = null;
return(wrong);
}
/// <summary>
/// Metoda do przetwarzania zgloszen
/// </summary>
/// <param name="client"></param>
private void ProcessClient(TcpClient client)
{
SslStream sslStream = new SslStream(client.GetStream(), false);
try
{
sslStream.AuthenticateAsServer(serverCertificate, false, SslProtocols.Tls, true);
int register = ReadOpeningMessage(sslStream, (IPEndPoint)client.Client.RemoteEndPoint);
if (register == 2)
{
byte[] result = Encoding.UTF8.GetBytes("1");
sslStream.Write(result);
sslStream.Flush();
sslStream.Close();
client.Close();
return;
}
else if (register == 1)
{
byte[] buffer = new byte[128];
int bytes = sslStream.Read(buffer, 0, buffer.Length);
char[] chars = new char[Encoding.UTF8.GetCharCount(buffer, 0, bytes)];
Encoding.UTF8.GetChars(buffer, 0, bytes, chars, 0);
StringBuilder messageData = new StringBuilder();
messageData.Append(chars);
string msg = messageData.ToString();
string login = msg.Substring(3);
X509Certificate2 cer = database.GetCertificate(login);
byte[] certificate;
if (cer != null)
{
certificate = CryptoModule.PreparePrivateCertToSend(cer);
}
else
{
throw new Exception();
}
sslStream.Write(certificate);
sslStream.Flush();
database.RunClient();
}
else
{
throw new Exception("Something went wrong");
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
byte[] result = Encoding.UTF8.GetBytes("0");
sslStream.Write(result);
sslStream.Flush();
sslStream.Close();
client.Close();
}
}
/// <summary>
/// Metoda do obslugi wiadomosci miedzy klientami
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MsgService(object sender, MsgEvent e)
{
StringBuilder sb = new StringBuilder();
Decoder decoder = Encoding.UTF8.GetDecoder();
char[] chars = new char[decoder.GetCharCount(e.msg, 0, e.msg.Length)];
decoder.GetChars(e.msg, 0, e.msg.Length, chars, 0);
sb.Append(chars);
string message = sb.ToString();
if (String.Compare("ONL", 0, message, 0, 3) == 0)
{
string result = null;
foreach (Client c in database)
{
if (c.isRunning && !c.isConnected)
{
result += c.login + " ";
}
}
byte[] msg;
if (result == null)
{
msg = Encoding.UTF8.GetBytes("ONLRNikt nie jest online");
}
else
{
msg = Encoding.UTF8.GetBytes("ONLR" + result);
}
foreach (Client c in database)
{
if (c.login == e.login)
{
c.Send(msg);
}
}
return;
}
else if (String.Compare("ISO", 0, message, 0, 3) == 0)
{
string login = message.Substring(3);
bool isOn = false;
string result;
foreach (Client c in database)
{
if (c.login == login && c.isRunning && !c.isConnected)
{
isOn = true;
break;
}
}
if (isOn)
{
result = "ISORTrue";
foreach (Client c in database)
{
if (c.login == e.login)
{
c.connectedTo = login;
break;
}
}
}
else
{
result = "ISORFalse";
}
byte[] msg = Encoding.UTF8.GetBytes(result);
foreach (Client c in database)
{
if (c.login == e.login)
{
c.Send(msg);
}
}
return;
}
else if (String.Compare("GCR", 0, message, 0, 3) == 0)
{
X509Certificate2 cerAlice = null;
X509Certificate2 cerBob = null;
string alice = e.login;
string bob = null;
foreach (Client c in database)
{
if (c.login == alice)
{
bob = c.connectedTo;
break;
}
}
foreach (Client c in database)
{
if (c.login == bob)
{
c.connectedTo = alice;
break;
}
}
Console.WriteLine("ALICE is {0}", alice);
Console.WriteLine("BOB is {0}", bob);
//Pobranie odpowiednich certyfikatow
foreach (Client c in database)
{
if (c.login == alice)
{
cerAlice = c.certificate;
}
else if (c.login == bob)
{
cerBob = c.certificate;
}
}
//Przygotowanie wiadomości dla Boba
//sb.Clear();
string prefix = "GCRB";
int bytes = Encoding.UTF8.GetByteCount(prefix);
//sb.Append(prefix).Append(bytes);
//prefix = sb.ToString();
//bytes = Encoding.UTF8.GetByteCount(prefix);
byte[] pre = Encoding.UTF8.GetBytes(prefix);
byte[] rawData = CryptoModule.PreparePublicCertToSend(cerAlice);
byte[] bobMsg = new byte[rawData.Length + bytes];
pre.CopyTo(bobMsg, 0);
rawData.CopyTo(bobMsg, bytes);
//Przygotowanie wiadomości dla Alice
//sb.Clear();
prefix = "GCRA";
bytes = Encoding.UTF8.GetByteCount(prefix);
//sb.Append(prefix).Append(bytes);
//prefix = sb.ToString();
//bytes = Encoding.UTF8.GetByteCount(prefix);
byte[] preA = Encoding.UTF8.GetBytes(prefix);
byte[] rawDataA = CryptoModule.PreparePublicCertToSend(cerBob);
byte[] aliceMsg = new byte[rawDataA.Length + bytes];
preA.CopyTo(aliceMsg, 0);
rawDataA.CopyTo(aliceMsg, bytes);
//Wyslanie wiadomosci
foreach (Client c in database)
{
if (c.login == alice)
{
c.Send(aliceMsg);
c.isConnected = true;
break;
}
}
Console.WriteLine("BOB certificate send to ALICE");
foreach (Client c in database)
{
if (c.login == bob)
{
c.Send(bobMsg);
c.isConnected = true;
break;
}
}
Console.WriteLine("ALICE certificate send to BOB");
return;
}
else if (String.Compare("DIS", 0, message, 0, 3) == 0)
{
Console.WriteLine("Logging {0} out", e.login);
string con = null;
bool conect = false;
foreach (Client c in database)
{
if (c.login == e.login)
{
if (c.isConnected)
{
con = c.connectedTo;
conect = true;
}
c.Stop();
Console.WriteLine("Client {0} disconnected", c.login);
break;
}
}
if (conect)
{
foreach (Client c in database)
{
if (c.login == con)
{
c.Send(Encoding.UTF8.GetBytes("DIC"));
c.isConnected = false;
c.connectedTo = null;
break;
}
}
}
}
else if (String.Compare("DIC", 0, message, 0, 3) == 0)
{
string log = null;
foreach (Client c in database)
{
if (c.login == e.login)
{
log = c.connectedTo;
c.isConnected = false;
c.connectedTo = null;
break;
}
}
foreach (Client c in database)
{
if (c.login == log)
{
c.Send(e.msg);
c.isConnected = false;
c.connectedTo = null;
break;
}
}
}
else if (String.Compare("MSG", 0, message, 0, 3) == 0)
{
Console.WriteLine("Message from {0}", e.login);
string log = null;
foreach (Client c in database)
{
if (c.login == e.login)
{
log = c.connectedTo;
break;
}
}
foreach (Client c in database)
{
if (c.login == log)
{
c.Send(e.msg);
break;
}
}
Console.WriteLine("Message sent to {0}", log);
}
}
