// Callback which is called when a client sends the login message.
// It shall verify the login and return the handshake message.
private static object GetHandshakeMessage(string channelId,
string responseReceiverId,
object loginMessage)
{
// Find the login name and password in "database"
// and encrypt the handshake message.
if (loginMessage is string)
{
string aLoginName = (string)loginMessage;
Console.WriteLine("Received login: "******"Login was not ok. The connection will be closed.");
return(null);
}
}
}
else
{
return(null);
}
}
// Callback which is called when a client sends the handshake response message.
private static bool Authenticate(string channelId,
string responseReceiverId,
object loginMessage,
object handshakeMessage,
object handshakeResponseMessage)
{
string aPassword;
if (loginMessage is string)
{
using (LogstorOEEEntities db = new TestLogin.LogstorOEEEntities())
{
string aLoginName = (string)loginMessage;
Users_Security users_Security = db.Users_Security.Where((x) => x.Login == aLoginName).FirstOrDefault();
if (!String.IsNullOrEmpty(users_Security.Password))
{
aPassword = users_Security.Password;
}
else
{
return(false);
}
}
// Get the password associated with the user.
// Decrypt the handshake response message.
// Handshake response message is one more time encrypted handshake message.
// Therefore if the handshake response is decrypted two times it should be
// the originaly generated GUID.
try
{
ISerializer aSerializer = new AesSerializer(aPassword);
// Decrypt handshake response to get original GUID.
string aDecodedHandshakeResponse1 = aSerializer.Deserialize <string>(handshakeResponseMessage);
byte[] temp = ConvertHandshakeToBytes(aDecodedHandshakeResponse1);
string aDecodedHandshakeResponse2 = aSerializer.Deserialize <string>(temp);
// Decrypt original handshake message.
string anOriginalGuid = aSerializer.Deserialize <string>(handshakeMessage);
// If GUIDs are equal then the identity of the client is verified.
if (anOriginalGuid == aDecodedHandshakeResponse2)
{
Console.WriteLine("Client authenticated.");
// The handshake response is correct so the connection can be established.
return(true);
}
}
catch (Exception err)
{
// Decoding of the response message failed.
// The authentication will not pass.
Console.WriteLine("Decoding handshake message failed.", err);
}
}
// Authentication did not pass.
Console.WriteLine("Authentication did not pass. The connection will be closed.");
return(false);
}