dotnet/runtime

NegotiateStreamPal.Unix.cs does not support default auth

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#66,633 opened on Mar 15, 2022

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 (4 comments) (0 reactions) (0 assignees)C# (5,445 forks)batch import
area-System.Net.Securityenhancementhelp wanted

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Description

Description

NegotiateStreamPal should support loading credential from NTLM_USER_FILE env var as per https://github.com/gssapi/gss-ntlmssp/blob/main/TESTING.txt

Delegating the credentials to gss-ntlmssp.

However, NegotiateStreamPal throws an exception before gss-ntlmssp has a chance to provide its own credentials.

Reproduction Steps

create an ntlm user file as per https://github.com/gssapi/gss-ntlmssp/blob/main/TESTING.txt Set NTLM_USER_FILE env var to point to said file. Then do an http get from an NTLM web server.

Expected behavior

HTTP 200

Actual behavior

System.PlatformNotSupportedException: NTLM authentication is not possible with default credentials on this platform.

Regression?

No response

Known Workarounds

Provide the credentials from dotnet. Which is a security risk that is advised against specifically.

Configuration

OS = Amazon Linux 2 Dotnet 3.1

Other information

No response

Contributor guide

Research direction
Investigate the code in NegotiateStreamPal.Unix.cs that throws PlatformNotSupportedException for NTLM default credentials. Modify it to allow gss ntlmssp to load credentials from NTLM USER FILE environment variable before failing.
Tech stack
csharp
Domain
backendauthentication
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C#NTLMUnix
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30