SmtpNtlmAuthenticationModule.cs

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using System.Collections.Generic;
using System.Security.Authentication.ExtendedProtection;
 
namespace System.Net.Mail;
 
internal sealed class SmtpNtlmAuthenticationModule : ISmtpAuthenticationModule
{
    private readonly Dictionary<object, System.Net.NTAuthentication> _sessions = new Dictionary<object, System.Net.NTAuthentication>();
 
    public string AuthenticationType => "ntlm";
 
    internal SmtpNtlmAuthenticationModule()
    {
    }
 
    public Authorization Authenticate(string challenge, NetworkCredential credential, object sessionCookie, string spn, ChannelBinding channelBindingToken)
    {
        try
        {
            lock (_sessions)
            {
                if (!_sessions.TryGetValue(sessionCookie, out var value))
                {
                    if (credential == null)
                    {
                        return null;
                    }
                    value = (_sessions[sessionCookie] = new System.Net.NTAuthentication(isServer: false, "Ntlm", credential, spn, System.Net.ContextFlagsPal.Connection, channelBindingToken));
                }
                string outgoingBlob = value.GetOutgoingBlob(challenge);
                if (!value.IsCompleted)
                {
                    return new Authorization(outgoingBlob, finished: false);
                }
                _sessions.Remove(sessionCookie);
                return new Authorization(outgoingBlob, finished: true);
            }
        }
        catch (NullReferenceException)
        {
            return null;
        }
    }
 
    public void CloseContext(object sessionCookie)
    {
    }
}