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Authentication problem when connecting to Git in TFS after migrating from JGit 3.2 to 4.1 [message #1779309]

Fri, 05 January 2018 08:28

Lars Heinemann

Messages: 1
Registered: January 2018

Junior Member

We are using JGit to access a Git within a Microsoft Team Foundation Server (TFS). This used to work fine with JGit 3.2.

We recently migrated to JGit 4.1 and now get the following error when performing a fetch:
org.eclipse.jgit.api.errors.TransportException: [...]: cannot open git-upload-pack

Internally this is caused by the following exception:

GSSException: No valid credentials provided (Mechanism level: No valid credentials provided (Mechanism level: Attempt to obtain new INITIATE credentials failed! (null)))

As far as we understand the following happens:

When trying to establish the connection, the server sends the following header
WWW-Authenticate=[NTLM, Negotiate, Basic realm="[...]"]
indicating the supported authentication schemes.
With 3.2, JGit would choose Basic and the connection is established. However with JGit 4.1, Negotiate is chosen leading to the error above, which is expected as we haven't set up Kerberos since we want to use Basic authentication.

The problem is that there does not seem to be a way to tell JGit to use Basic authentication even if the server would support a more secure scheme.

Any ideas how to address this problem?

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