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

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Date:	Sun, 10 Jun 2007 02:04:25 -0700 (PDT)
From:	david@...g.hm
To:	Pavel Machek <pavel@....cz>
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

On Sun, 10 Jun 2007, Pavel Machek wrote:

> 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.

and if each file has it's own label you are going to need regex or similar 
to deal with them as well.

David Lang
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