public static int Establish(ref byte[] EncryptionKeyServer, ref byte[] Salt, HenkTcpClient Client, string Password, string UserName, RSAKey RSAKey)
{
try
{
EncryptionKeyServer = Encryption.RSA.Decrypt(Client.WriteAndGetReply(CombineBytes(new byte[] { 42, 1 }, RSAKey.PublicKey), TimeSpan.FromSeconds(TIMESPAN)).Data, RSAKey.PrivateKey);
Client.SetEncryption(Aes.Create(), EncryptionKeyServer);
Salt = Client.WriteAndGetReply(new byte[] { 42, 2 }, TimeSpan.FromSeconds(1)).DecryptedData;
Rfc2898DeriveBytes HashedPassword = new Rfc2898DeriveBytes(Password, Salt, 250000);
byte ValidPassword = Client.WriteAndGetReply(CombineBytes(new byte[] { 42, 3 }, HenkTcp.Encryption.Encrypt(Aes.Create(), HashedPassword.GetBytes(20), EncryptionKeyServer)), TimeSpan.FromSeconds(TIMESPAN)).Data[0];
if (ValidPassword.Equals(1))
{
byte ValidUserName = Client.WriteAndGetReply(CombineBytes(new byte[] { 42, 4 }, AES256.encrypt(UserName, Password, Salt)), TimeSpan.FromSeconds(TIMESPAN)).Data[0];
if (ValidUserName.Equals(1))
{
return(3); //evrything ok
}
else
{
Client.Disconnect(); return(2);
} //UserName already taken
}
else
{
Client.Disconnect(); return(1);
} //Wrong password
}
catch { return(0); }//server did not reply on a message
}
public static string SendCommand(string Text, HenkTcpClient Client, byte[] EncryptionKeyServer, string Password, byte[] Salt)
{
if (Text.Equals("!users"))
{
int Online = BitConverter.ToInt32(Client.WriteAndGetReply(new byte[] { 42, 6, 1 }, TimeSpan.FromSeconds(1)).DecryptedData, 0);
string Users = string.Empty;
for (int x = 0; x < Online; x++)
{
Users += ", " + AES256.decrypt(Client.WriteAndGetReply(CombineBytes(new byte[] { 42, 6, 1 }, BitConverter.GetBytes(x)), TimeSpan.FromSeconds(1)).Data, Password, Salt);
}
return($"({Online}) {Users.Remove(0, 2)}");
}
if (Text.StartsWith("!admin "))
{
Rfc2898DeriveBytes HashedAdminPassword = new Rfc2898DeriveBytes(Text.Remove(0, 7), Salt, 500000);
return(_SendCommand(CombineBytes(new byte[] { 42, 6 }, HenkTcp.Encryption.Encrypt(Aes.Create(), Encoding.UTF8.GetBytes("!admin " + Convert.ToBase64String(HashedAdminPassword.GetBytes(20))), EncryptionKeyServer)), Client));
}
else if (Text.StartsWith("!kick "))
{
return(_SendCommand(CombineBytes(new byte[] { 42, 6, 2 }, AES256.encrypt(Text.Remove(0, 6), Password, Salt)), Client));
}
else if (Text.StartsWith("!ban "))
{
return(_SendCommand(CombineBytes(new byte[] { 42, 6, 3 }, AES256.encrypt(Text.Remove(0, 5), Password, Salt)), Client));
}
else
{
return(_SendCommand(CombineBytes(new byte[] { 42, 6 }, HenkTcp.Encryption.Encrypt(Aes.Create(), Encoding.UTF8.GetBytes(Text), EncryptionKeyServer)), Client));
}
}
private async void _OnDisconnect(object sender, HenkTcpClient e)
{
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
Chat_GRD.Visibility = Visibility.Collapsed;
Connect_GRD.Visibility = Visibility.Visible;
Messages_LV.Items.Clear();
Message_TB.Text = string.Empty;
_Client.DataReceived -= _DataReceived;
_Client.OnDisconnect -= _OnDisconnect;
});
}
private void _Connect(object sender, RoutedEventArgs e)
{
if (Popup_GRD.Visibility == Visibility.Visible)
{
Popup_Text.Text = "You are trying to quick"; return;
}
Settings.SetIp(ServerName_TB.Text);
Settings.SetUsername(UserName_TB.Text);
_Client = new HenkTcpClient();
int x = Connection.Connect(ServerName_TB.Text, _Client);
if (x.Equals(0))
{
_ShowPopup("Could not connect to NameServer"); return;
}
else if (x.Equals(1))
{
_ShowPopup("Server does not exists"); return;
}
else if (x.Equals(2))
{
_ShowPopup("Could not connect to server"); return;
}
x = Connection.Establish(ref EncryptionKeyServer, ref Salt, _Client, Password_PWB.Password, UserName_TB.Text, _RSAKey);
if (x.Equals(0))
{
_ShowPopup("Server timed out");
}
else if (x.Equals(1))
{
_ShowPopup("Wrong password");
}
else if (x.Equals(2))
{
_ShowPopup("UserName is already taken");
}
else if (x.Equals(3))
{
_Connected();
}
}
private static string _SendCommand(byte[] Data, HenkTcpClient Client) => Encoding.UTF8.GetString(Client.WriteAndGetReply(Data, TimeSpan.FromSeconds(1)).DecryptedData);
public static int Connect(string ServerName, HenkTcpClient Client)
{
if (ServerName.StartsWith("!"))
{
string[] Credentials = ServerName.Split('/');
if (Credentials.Length.Equals(2))
{
int Port;
if (!int.TryParse(Credentials[1], out Port))
{
return(2);
}
return(Client.Connect(Credentials[0].Remove(0, 1), Port, TimeSpan.FromSeconds(TIMESPAN)) ? 3 : 2);//2 = could not connect to server,3= ok
}
else if (Credentials.Length.Equals(3))
{
int Port;
if (!int.TryParse(Credentials[1], out Port))
{
return(2);
}
if (!Client.Connect(Credentials[0].Remove(0, 1), Port, TimeSpan.FromSeconds(TIMESPAN)))
{
return(0); //could not connect to name server
}
var Reply = Client.WriteAndGetReply(new Rfc2898DeriveBytes(Credentials[2].ToLower(), new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }, 10000).GetBytes(20), TimeSpan.FromSeconds(TIMESPAN));
if (Reply == null)
{
return(0);
}
else if (Reply.Data[0].Equals(0))
{
return(1);
}
int ServerPort = BitConverter.ToInt32(Reply.Data, 0);
return(Client.Connect(Credentials[0].Remove(0, 1), ServerPort, TimeSpan.FromSeconds(TIMESPAN)) ? 3 : 2);//2 = could not connect to server,3= ok
}
else
{
return(2);//could not connect to server, invalid credentials
}
}
else
{
if (!Client.Connect(IP, NAME_SERVER_PORT, TimeSpan.FromSeconds(TIMESPAN)))
{
return(0); //could not connect to name server
}
var Reply = Client.WriteAndGetReply(new Rfc2898DeriveBytes(ServerName.ToLower(), new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }, 10000).GetBytes(20), TimeSpan.FromSeconds(TIMESPAN));
if (Reply == null)
{
return(0);
}
else if (Reply.Data[0].Equals(0))
{
return(1);
}
int ServerPort = BitConverter.ToInt32(Reply.Data, 0);
return(Client.Connect(IP, ServerPort, TimeSpan.FromSeconds(TIMESPAN)) ? 3 : 2);//2 = could not connect to server,3= ok
}
}
