linux-kernel - Re: AppArmor FAQ

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Message-ID: <Pine.LNX.4.63.0704201144160.4634@qynat.qvtvafvgr.pbz>
Date:	Fri, 20 Apr 2007 11:45:34 -0700 (PDT)
From:	David Lang <david.lang@...italinsight.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
cc:	Andi Kleen <andi@...stfloor.org>,
	Karl MacMillan <kmacmill@...hat.com>,
	David Safford <safford@...son.ibm.com>,
	James Morris <jmorris@...ei.org>,
	John Johansen <jjohansen@...e.de>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: AppArmor FAQ

On Thu, 19 Apr 2007, Stephen Smalley wrote:

> already happened to integrate such support into userland.
>
> To look at it in a slightly different way, the AA emphasis on not
> modifying applications could be viewed as a limitation.  Ultimately,
> users have security goals that go beyond just what the OS can directly
> enforce and at least some applications (notably things like X, D-BUS,
> PostgreSQL, etc) need to likewise support strong domain separation and
> controlled information flow through their own internal objects and
> operations.  SELinux provides APIs and infrastructure for such
> applications, and has already done quite a bit of work in that space
> (D-BUS support, XACE/XSELinux, SE-PostgreSQL), whereas AA seems to have
> no interest in going there (and would have to recant its emphasis on no
> application mods to do so).  If you actually want to truly confine a
> desktop application, you can't limit yourself to the kernel.  And the
   ^^^^^^^^^^^^^^^^^^^

> label model provides a unifying abstraction for dealing with all of
> these various objects, whereas the path/"natural abstraction" model has
> no unifying abstraction at all.


AA isn't aimed at confineing desktop applications. it's aimed at confining 
server applications. this really is a easier task (if it happens to be useful 
for some desktop apps as well, so much the better)

David Lang
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