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

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Date:	Sat, 09 Jun 2007 11:33:07 -0400
From:	Joshua Brindle <method@...icmethod.com>
To:	david@...g.hm
CC:	Sean <seanlkml@...patico.ca>, Greg KH <greg@...ah.com>,
	Andreas Gruenbacher <agruen@...e.de>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Pavel Machek <pavel@....cz>, 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

david@...g.hm wrote:
> On Sat, 9 Jun 2007, Sean wrote:
> <snip>
>
> what SELinux cannot do is figure out what label to assign a new file.
>

Nit: SELinux figures out what to label new files fine, just not based on 
the name. This works in most cases, eg., when user_t creates a file in 
/tmp it becomes user_tmp_t, incidentally this is something that AA 
cannot handle, if the filenames aren't normalized (they normally 
aren't). For example, my ssh agent socket is stored in 
/tmp/ssh-XXXXXXXX, where the X's are random characters, AA can't 
differentiate admin ssh agents from unprivileged user ssh agents, 
showing a serious flaw in their model.

The complaint is that name-based labeling doesn't currently exist (and 
as Sean has stated that doesn't mean it _can't_ exist, just that it 
doesn't currently). In practice this has not been as big of an issue as 
you are making it out to be. Granted restorecond has a tiny race, and I 
wouldn't recommend using it on very security sensitive files but for 
usability having it relabel user_home_t to user_http_content_t isn't a 
problem (and causes no security issues).

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