C# NTLM authentication function

Question

I need to programmatically rewrite NTLM authentication over http.

.Net does it by simple code like this:

public static byte [] downloadFile(string url){
  using (var client = new WebClient { Credentials = new NetworkCredential("username", "password", "domain") })
      {
           return client.DownloadData(url);
      }   }

But I want to modify NTLM over http that .Net implements and write a new class inherent by WebClient.

So which class in .Net implements NTLM over http or how .Net handle NTLM authentication?

Which class in .Net is responsible for NTLM Authentication in the back-end? — Robotech_Life, Mar 19 '19 at 22:21
@Robotech_Life - It depends which back-end you use... you showed client code.... — Milney, Mar 19 '19 at 23:06
https://referencesource.microsoft.com/#System/net/System/Net/_NtlmClient.cs,b300f9eab02ba4c8 — Milney, Mar 19 '19 at 23:16
P.S. you probably do not want to rewrite an NTLM implementation... — Milney, Mar 19 '19 at 23:17
I found a Microsoft sample that does it. https://learn.microsoft.com/en-us/dotnet/api/system.net.authenticationmanager?view=netframework-4.7.2#examples — Robotech_Life, Mar 20 '19 at 16:58

score 0 · Answer 1 · answered Mar 20 '19 at 14:46

0

SSPI does it all for you. If you want to roll your own NTLM, there is a lot of work to be done. What is SSPI not doing for you?

answered Mar 20 '19 at 14:46

markgamache

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C# NTLM authentication function

1 Answers1