public AuthMechanismProcessorStatus ProcessResponse(string data)
{
if (_challenge == null)
{
StringBuilder challenge = new StringBuilder();
challenge.Append(_random.Next(Int16.MaxValue));
challenge.Append(".");
challenge.Append(DateTime.Now.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 = 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 CramMd5AuthenticationRequest(username, _challenge, hash);
AuthenticationResult result =
Connection.Server.Behaviour.ValidateAuthenticationCredentials(Connection, Credentials);
switch (result)
{
case AuthenticationResult.Success:
return AuthMechanismProcessorStatus.Success;
default:
return AuthMechanismProcessorStatus.Failed;
}
}
}