[PATCH 8/9] kerberos: Don't include GSS_C_DCE_STYLE in default gss_init_sec_context() flags.

Dmitry Timoshkov dmitry at baikal.ru
Tue Jan 30 03:47:22 CST 2018

Hans Leidekker <hans at codeweavers.com> wrote:

> On Thu, 2018-01-25 at 20:51 +0800, Dmitry Timoshkov wrote:
> > Sure, I can take a look. Can you show me how to reproduce your failure?
> > 
> > Just run the tester, type http://wintest2.test.local in the "Url:" field
> > and press "Test" button. Make sure that you have a valid TGT in the cache.
> > (I assume that SPN "HTTP/wintest2.test.local" from the log you've provided
> > ealier exists on the server, otherwise you may need to list available SPNs
> > on the Windows side using 'setspn -T yourdomain.com - Q */*' and find one
> > starting with HTTP/ prefix).
> The tool expects a web server with a specific configuration. I
> installed IIS 7.0, added the 'Windows Authentication' feature and
> enabled it for the test site.
> It turns out that it's testing the Negotiate provider, which doesn't do
> the same three-leg authentication as the Kerberos provider.

Thanks for the ongoing efforts.

The Negotiate provider is just a thin layer that switches between NTLM
and Kerberos, probabaly IIS doesn't use Kerberos for some reason and
falls back to NTLM. Inspecting HTTP headers in Kerberos Tester or HTTP
exchange in Wireshark may help. I have created a simple test app that
replicates in plain C what Kerberos Tester is doing and does some
additional logging/HTTP headers dumping.

On the other hand since I have a working server with proper Kerberos
support and dedicated SPNs I could try to take care of the problem
on my own, and you then may switch to reviewing secur32 patches in
the queue. Just let me know if you prefer going this way.


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