Re: Linux CIFS and Nexenta compatibility issue

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On Fri, 7 Jun 2013 13:15:53 +0200
Ketil Froyn <ketil@xxxxxxxxxx> wrote:

> Hi,
> 
> I have a Nexenta system (based on OpenSolaris/IllumOS) running ZFS
> shared with CIFS. After upgrading to Ubuntu 13.04, I'm unable to mount
> the Nexenta CIFS shares. I've posted an Ubuntu bug report here with
> details (though I'm not sure cifs-utils was the right place to report
> this), including cifsFYI enabled trace of the mount operation:
> 
> https://bugs.launchpad.net/ubuntu/+source/cifs-utils/+bug/1185025
> 
> In the test results shown, I had specified my username and password to
> mount. I have since discovered that when specifying my
> username/password directly to mount, I am able to mount the shares
> with the sec=ntlm or sec=ntlmv2 options. However, I've used
> Likewise-Open to sign my desktop into the AD domain, so that any AD
> user ID can log on to Ubuntu, and then get CIFS shares automounted
> with the user's credentials. I guess mount uses sec=krb5 to mount
> these shares.  That still fails with the same log output. This works
> fine on all the shares except Nexenta shares, and with Ubuntu 12.10
> the Nexenta shares worked fine.
> 
> So there appears to be some sort of CIFS compatibility issue between
> Nexenta OS 3.1.3.5 and Ubuntu 13.04. In short, all other OS-es
> (Windows, Mac, other versions of Ubuntu) work with the Nexenta OS
> 3.1.3.5 CIFS server and all other CIFS servers in the domain, and
> Ubuntu 13.04 works with all other CIFS servers in the domain, but not
> the Nexenta 3.1.3.5 server. So something in the linux CIFS codebase
> between Ubuntu 12.10 and 13.04 appears to have triggered this error.
> 
> Is there anything else I can do to find out exactly what is happening,
> and whether this is linux CIFS' or Nexenta OS's fault, or a
> combination?
> 
> Ubuntu 13.04 uses cifs-utils 5.5, presumably with some Ubuntu patches,
> and linux kernel 3.8.0, presumably also with Ubuntu patches.
> 
> Regards, Ketil

Likely more fallout from the change to sec=ntlmssp by default. I wonder
if the nexenta server doesn't support extended security? In any case,
does this work if you mount with sec=ntlmv2 in the options? If that
doesn't work, can you try sec=ntlm?

-- 
Jeff Layton <jlayton@xxxxxxxxx>
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