Messages in this thread | | | Date | Sun, 10 Jun 2007 17:17:24 -0400 | From | Joshua Brindle <> | Subject | Re: [AppArmor 39/45] AppArmor: Profile loading and manipulation, pathname matching |
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Crispin Cowan wrote: > david@lang.hm wrote: > >> On Fri, 8 Jun 2007, Greg KH wrote: >> >>> I still want to see a definition of the AA "model" that we can then use >>> to try to implement using whatever solution works best. As that seems >>> to be missing the current argument of if AA can or can not be >>> implemented using SELinux or something totally different should be >>> stopped. >>> >> the way I would describe the difference betwen AA and SELinux is: >> >> SELinux is like a default allow IPS system, you have to describe >> EVERYTHING to the system so that it knows what to allow and what to stop. >> >> AA is like a default deny firewall, you describe what you want to >> happen, and it blocks everything else without you even having to >> realize that it's there. >> > That's not quite right: > > * SELinux Strict Policy is a default-deny system: it specifies > everything that is permitted system wide, and all else is denied. > * AA and the SELinux Targeted Policy are hybrid systems: > o default-deny within a policy or profile: confined processes > are only permitted to do what the policy says, and all else > is denied. > o default-allow system wide: unconfined processes are allowed > to do anything that classic DAC permissions allow. > Still not completely correct, though the targeted policy has an unconfined domain (unconfined_t) the policy still has allow rules for everything unconfined can do, 2 examples of things unconfined still can't do (because they aren't allowed by the targeted policy) is execmem and a while back when there was a /proc exploit that required setattr on /proc/self/environ; unconfined_t wasn't able to do that either (and therefore the exploit didn't work on a targeted system).
That said, the differentiation between strict and targeted is going away soon so that one can have some users be unconfined (but still with a few restrictions) and others can be fully restricted.
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