linux-kernel - Re: [PATCH] Version 3 (2.6.23-rc8) Smack: Simplified Mandatory Access Control Kernel

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Date:	Sun, 30 Sep 2007 19:39:57 +0200
From:	Andi Kleen <ak@...e.de>
To:	Joshua Brindle <method@...icmethod.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, casey@...aufler-ca.com,
	torvalds@...ux-foundation.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>,
	Paul Moore <paul.moore@...com>
Subject: Re: [PATCH] Version 3 (2.6.23-rc8) Smack: Simplified Mandatory Access Control Kernel


> CIPSO is supported on SELinux as well.

That's no reason to extend that design mistake.

> It certainly has uses where IPSec  
> is excessive. One example is someone I talked to recently that basically 
> has a set of blade systems connected with a high speed backplane that 
> looks like a network interface. CIPSO is useful in this case because 
> they can't afford the overhead of IPSec but need to transfer the level 
> of the connection to the other machines. The backplane is a trusted 
> network and that isn't a dangerous assumption in this case.

If one of the boxes gets broken in all are compromised this way? 

> CIPSO also lets systems like SELinux and SMACK talk to other trusted 
> systems (eg., trusted solaris) in a way they understand. 

Perhaps, but is the result secure? I have severe doubts.

> I don't  
> regularly support CIPSO as I believe IPSec labeling is more useful in 
> more situations but that doesn't mean CIPSO is never useful.

Security that isn't secure is not really useful. You might as well not
bother.

-Andi

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