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

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Date:	Sun, 10 Jun 2007 10:34:27 +0200
From:	Pavel Machek <pavel@....cz>
To:	david@...g.hm
Cc:	Greg KH <greg@...ah.com>, Andreas Gruenbacher <agruen@...e.de>,
	Stephen Smalley <sds@...ho.nsa.gov>, jjohansen@...e.de,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching

Hi!

> >So, AA developers, do you have such a document anywhere?  I know there
> >are some old research papers, do they properly describe the current
> >model you are trying to implement here?
> 
> Greg,
>   to implement the AA approach useing SELinux you need to have a way that 
> files that are renamed or created get tagged with the right label 
> automaticaly with no possible race condition.
> 
> If this can be done then it _may_ be possible to do the job that AA is 
> aimed at with SELinux, but the work nessasary to figure out what lables 
> are needed on what file would still make it a non-trivial task.
> 
> as I understand it SELinux puts one label on each file, so if you have 
> three files accessed by two programs such that
> program A accesses files X Y
> program B accesses files Y Z
> 
> then files X Y and Z all need seperate labels with the policy stateing 
> that program A need to access labels X, Y and program B needs to access 
> files Y Z
> 
> extended out this can come close to giving each file it's own label. AA 
> essentially does this and calls the label the path and computes it at 
> runtime instead of storing it somewhere.

Yes, and in the process, AA stores compiled regular expressions in
kernel. Ouch. I'll take "each file it's own label" over _that_ any time. 
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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