linux-kernel - Re: [AppArmor 00/41] AppArmor security module overview

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Message-ID: <20070412135028.GE5881@ucw.cz>
Date:	Thu, 12 Apr 2007 13:50:29 +0000
From:	Pavel Machek <pavel@....cz>
To:	jjohansen@...e.de
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chrisw@...s-sol.org
Subject: Re: [AppArmor 00/41] AppArmor security module overview

Hi!

> AppArmor's Overall Design
> =========================
> 
> AppArmor protects systems from vulnerable software by confining
> processes, giving them "least privilege" access to the system's
> resources: with least privilege, processes are allowed exactly what they
> need, nothing more, and nothing less. Systems are thus protected from
> bugs in applications that would lead to privilege escalation, such as
> remote system access because of a buffer overflow in a web server, etc.
> 
> AppArmor does this by defining application profiles which list allowed
> accesses, and assigning those profiles to processes. AppArmor does *not*

You can do the same with ptrace. If that's not fast enough... improve
ptrace?

> The corollary to this is that attacks against AppArmor that start with
> "assume some unconfined process does ..." are outside the AppArmor
> threat model. Any process that might do something malicious to an

IOW AppArmor is broken by design. (One reason is: operations by unconfined
processes that did not use to be security sensitive before -- ln
shadow random_name -- are security sensitive now.)

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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