public AuthMechanismProcessorStatus ProcessResponse(string data)
{
if (data != null)
{
State = States.WaitingForUsername;
}
switch (State)
{
case States.Initial:
Connection.WriteResponse(new SmtpResponse(StandardSmtpResponseCode.AuthenticationContinue,
Convert.ToBase64String(
Encoding.ASCII.GetBytes("Username:"******"Password:"))));
State = States.WaitingForPassword;
return(AuthMechanismProcessorStatus.Continue);
case States.WaitingForPassword:
string password = ServerUtility.DecodeBase64(data);
State = States.Completed;
Credentials = new LoginAuthenticationCredentials(_username, password);
AuthenticationResult result =
Connection.Server.Behaviour.ValidateAuthenticationCredentials(Connection,
Credentials);
switch (result)
{
case AuthenticationResult.Success:
return(AuthMechanismProcessorStatus.Success);
break;
default:
return(AuthMechanismProcessorStatus.Failed);
break;
}
default:
throw new NotImplementedException();
}
}
public AuthMechanismProcessorStatus ProcessResponse(string data)
{
if (_challenge == null)
{
StringBuilder challenge = new StringBuilder();
challenge.Append(_random.GenerateRandomInteger(0, Int16.MaxValue));
challenge.Append(".");
challenge.Append(_dateTimeProvider.GetCurrentDateTime().Ticks.ToString());
challenge.Append("@");
challenge.Append(Connection.Server.Behaviour.DomainName);
_challenge = challenge.ToString();
string base64Challenge = Convert.ToBase64String(Encoding.ASCII.GetBytes(challenge.ToString()));
Connection.WriteResponse(new SmtpResponse(StandardSmtpResponseCode.AuthenticationContinue,
base64Challenge));
return(AuthMechanismProcessorStatus.Continue);
}
else
{
string response = ServerUtility.DecodeBase64(data);
string[] responseparts = response.Split(' ');
if (responseparts.Length != 2)
{
throw new SmtpServerException(new SmtpResponse(StandardSmtpResponseCode.AuthenticationFailure,
"Response in incorrect format - should be USERNAME RESPONSE"));
}
string username = responseparts[0];
string hash = responseparts[1];
Credentials = new CramMd5AuthenticationCredentials(username, _challenge, hash);
AuthenticationResult result =
Connection.Server.Behaviour.ValidateAuthenticationCredentials(Connection, Credentials);
switch (result)
{
case AuthenticationResult.Success:
return(AuthMechanismProcessorStatus.Success);
break;
default:
return(AuthMechanismProcessorStatus.Failed);
break;
}
}
}
public AuthMechanismProcessorStatus ProcessResponse(string data)
{
if (string.IsNullOrEmpty(data))
{
if (State == States.AwaitingResponse)
{
throw new SmtpServerException(new SmtpResponse(StandardSmtpResponseCode.AuthenticationFailure,
"Missing auth data"));
}
Connection.WriteResponse(new SmtpResponse(StandardSmtpResponseCode.AuthenticationContinue, ""));
State = States.AwaitingResponse;
return(AuthMechanismProcessorStatus.Continue);
}
string decodedData = ServerUtility.DecodeBase64(data);
string[] decodedDataParts = decodedData.Split('\0');
if (decodedDataParts.Length != 3)
{
throw new SmtpServerException(new SmtpResponse(StandardSmtpResponseCode.AuthenticationFailure,
"Auth data in incorrect format"));
}
string username = decodedDataParts[1];
string password = decodedDataParts[2];
Credentials = new PlainAuthenticationCredentials(username, password);
AuthenticationResult result =
Connection.Server.Behaviour.ValidateAuthenticationCredentials(Connection, Credentials);
switch (result)
{
case AuthenticationResult.Success:
return(AuthMechanismProcessorStatus.Success);
break;
default:
return(AuthMechanismProcessorStatus.Failed);
break;
}
}
