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

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To: Pavel Machek <pavel@...>
Cc: <jjohansen@...>, <linux-kernel@...>, <linux-security-module@...>, <linux-fsdevel@...>
Date: Monday, June 4, 2007 - 5:03 pm

On Tuesday 15 May 2007 11:20, Pavel Machek wrote:

I assume you mean labels instead of handles.

AppArmor's design is around paths not labels, and independent of whether or 
not you like AppArmor, this design leads to a useful security model distinct 
from the SELinux security model (which is useful in its own ways). The 
differences between those models cannot be argued away, neither is a subset 
of the other, and neither is a misdesign. I would be thankful if you could 
stop spreading this lie.


You are quite mistaken. SELinux turns pathnames into labels when it initially 
labels all files (when a policy is rolled out), whereas AppArmor computes 
the "label" of each file when a file is opened. The two models start to 
diverge as soon as files are renamed: in SELinux, labels stick with the 
files. In AppArmor, "labels" stick with the names.

So what you advocate for is a hybrid between the SELinux and the AppArmor 
model, not a superset.

It could be that the SELinux folks will solve the issues they are having with 
new files using something better than restorecond in the future, perhaps even 
an in-kernel mechanism (although I somewhat doubt it). But then again, their 
basic model makes sense even without any live file relabeling, and so that's 
probably not very high up on the priority list.

Andreas
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Messages in current thread:
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Andreas Gruenbacher, (Mon Jun 4, 5:03 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Andreas Gruenbacher, (Fri Jun 8, 6:03 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Andreas Gruenbacher, (Sat Jun 9, 11:17 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Tue Jun 12, 1:03 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Andreas Gruenbacher, (Thu Jun 21, 11:54 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Thu Jun 21, 12:08 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Thu Jun 21, 3:35 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Thu Jun 21, 3:24 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Thu Jun 21, 3:54 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Fri Jun 22, 8:42 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Tue Jun 26, 4:50 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Thu Jun 21, 5:17 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Fri Jun 22, 6:49 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Thu Jun 21, 8:19 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Fri Jun 22, 7:37 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Fri Jun 22, 8:54 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Lars Marowsky-Bree, (Thu Jun 21, 4:21 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Andreas Gruenbacher, (Fri Jun 22, 5:59 am)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Andreas Gruenbacher, (Thu Jun 21, 12:01 pm)
Re: [AppArmor 39/45] AppArmor: Profile loading and manipulat..., Andreas Gruenbacher, (Sat Jun 9, 11:05 am)
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