linux-kernel - Re: [linux-cifs-client] [RFC PATCH] CIFS posix acl permission checking

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Message-Id: <E1Npzvj-00AWaC-KI@intern.SerNet.DE>
Date:	Fri, 12 Mar 2010 09:09:11 +0100
From:	Michael Adam <obnox@...ba.org>
To:	Jeremy Allison <jra@...ba.org>
Cc:	Michael Adam <obnox@...ba.org>, Jeff Layton <jlayton@...ba.org>,
	Jon Severinsson <jon@...erinsson.net>,
	linux-cifs-client@...ts.samba.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, vl@...ba.org
Subject: Re: [linux-cifs-client] [RFC PATCH] CIFS posix acl permission checking

Jeremy Allison wrote:
> On Thu, Mar 11, 2010 at 11:45:29PM +0100, Michael Adam wrote:
> > 
> > When discussing this with Volker today, he had a different idea:
> > One could implement a trans2 impersonate call in samba (as a new
> > call in the unix extensions) that could be used to transfer the
> > session established by the privileged user (root, say) to a
> > different user specified as an argument to the call -- without
> > the need to give credentials! Then this call could be used in
> > the multi user mount scenario: when uid 1000 accesse the cifs
> > mount then the root-dispatcher mount would create a new session
> > initially as root and issue an impersonate call to user 1000
> > directly afterwards.
> > 
> > Wouldn't that be something worth considering?
> 
> This world work, but protocol cleanliness-wise it's
> *really* horrible :-).

Agreed. :-)


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