linux-kernel - Re: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching

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Date:	Thu, 28 Jun 2007 18:31:22 +0000
From:	Pavel Machek <pavel@....cz>
To:	David Wagner <daw-usenet@...erner.cs.berkeley.edu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching

Hi!

> >What you do with AppArmor, instead of addressing the problem, is just 
> >redefine the environment along the lines of "set your house into a rock 
> >wall so there is only one path to it".
> 
> Harrumph.  Those analogies sound good but aren't a very good guide.
> 
> Let's take a concrete example.  Consider the following fragment of a
> policy for Mozilla:
>     allow ~/.mozilla
>     deny ~
> Ignore the syntax; the goal is to allow Mozilla to access files under
> ~/.mozilla but nothing else under my home directory.  This is a perfectly
> reasonable policy fragment to want to enforce.  And enforcing it in
> the obvious way using pathname-based access control is not a ridiculous
> thing to do.

Unfortunately, mozilla needs temporary files IIRC. And when you add
allow /tmp

to your config files, you get system where your fellow users can 
ln HOME/.ssh/identity /tmp/to-steal (or
ln HOME/.profile /tmp/put-evil-code-here)
and AA protection is not effective any more.

Would _you_ do this mistake?

Would our users do this mistake?

Is it right to provide them with auto-learning tools to make this
mistake really easy?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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