[linux-cifs-client] Linux CIFS NTLMSSP mount failing against win2k8

Jeff Layton jlayton at samba.org
Sat Apr 10 16:19:31 MDT 2010

On Sat, 10 Apr 2010 18:17:30 -0400
Jeff Layton <jlayton at samba.org> wrote:

> I've been playing with NTLMSSP today in CIFS, and have run across a
> problem. The Session Setup using Raw NTLMSSP succeeds, but then afterward
> the tree connect fails with STATUS_ACCESS_DENIED. The odd thing is that
> if authenticate as the same user using krb5, then it works fine.
> smbclient does SPNEGO encapsulated NTLMSSP and the tree connect it does
> works fine as well.
> Attached is a capture that shows two "mount attempts". The first one
> fails (that the Linux CIFS one). The second succeeds -- that's the
> Linux CIFS one.
> The code I'm using is slightly modified so that the tree connect is
> closer to identical to what smbclient does. That doesn't get around the
> problem though. I assume that there must be something wrong with the
> session setup, but since it succeeds it seems like it ought to work...
> Does anyone have any clue as to what the problem is? Or does anyone
> know how to make win2k8 tell me why it's refusing the tree connect? The
> event viewer seems to be pretty useless for this, but maybe I'm just
> not looking in the right place?

Oops, forgot to attach the capture. Any help would be appreciated.

I should also note that NTLMSSP authenticated mounts seem to work fine
against samba too. It's just my win2k8 box that seems to not like
something here. I'm just not sure how to tell what's wrong.

Jeff Layton <jlayton at samba.org>
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