linux-kernel - Re: AppArmor Security Goal

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Message-ID: <4738E8A2.1060004@crispincowan.com>
Date:	Mon, 12 Nov 2007 15:58:26 -0800
From:	Crispin Cowan <crispin@...spincowan.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	david@...g.hm, "Dr. David Alan Gilbert" <linux@...blig.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	LSM ML <linux-security-module@...r.kernel.org>,
	apparmor-dev <apparmor-dev@...ge.novell.com>
Subject: Re: AppArmor Security Goal

Alan Cox wrote:
>> but how can the system know if the directory the user wants to add is 
>> reasonable or not? what if the user says they want to store their 
>> documents in /etc?
>>     
> A more clear example is wanting to wrap a specific tool with temporary
> rules. Those rules would depend on the exact file being edited at this
> moment - something root cannot know in advance
> (although with apparmor I guess mv $my_file apparmour_magic.name ; foo;
> mv it back might work 8))
>   
If you have unconfined root privilege on an AppArmor box, then setting
up a temporary profile is trivial. As Alan suggests, you could just have
a standard profile for /home/crispin/bin/foo and fun with mv would
switch programs in and out of it. Or for more control, just draft a new
policy and load it; it just takes a few seconds to cp the profile for
something else and edit it a bit, and then load it.

The big difference between the former and latter is that the former is
inflexible (it either works or it doesn't) and the latter requires
privilege.

Crispin

-- 
Crispin Cowan, Ph.D.               http://crispincowan.com/~crispin
CEO, Mercenary Linux		   http://mercenarylinux.com/
	       Itanium. Vista. GPLv3. Complexity at work

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