linux-kernel - Re: Linux Security *Module* Framework (Was: LSM conversion to static interface)

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Date:	Wed, 24 Oct 2007 19:59:15 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
CC:	Adrian Bunk <bunk@...nel.org>, Chris Wright <chrisw@...s-sol.org>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andreas Gruenbacher <agruen@...e.de>,
	Thomas Fricaccia <thomas_fricacci@...oo.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	James Morris <jmorris@...ei.org>,
	Crispin Cowan <crispin@...spincowan.com>,
	Giacomo Catenazzi <cate@...ian.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Linux Security *Module* Framework (Was: LSM conversion to static
 interface)

On 24/10/07 19:51, Jan Engelhardt wrote:
> On Oct 24 2007 19:11, Simon Arlott wrote:
>>
>>* (I've got a list of access rules which are scanned in order until one of 
>>them matches, and an array of one bit for every port for per-port default 
>>allow/deny - although the latter could be removed.
>>http://svn.lp0.eu/simon/portac/trunk/)
> 
> Besides the 'feature' of inhibiting port binding,
> is not this task of blocking connections something for a firewall?

The firewall blocks incoming connections where appropriate, yes, but it 
doesn't stop one user binding to a port that another user expected to be able 
to use. "Ownership" of ports (1-1023) shouldn't be something only root (via 
CAP_NET_BIND_SERVICE) has. Lots of services also don't have standard ports 
below 1024 and it's useful to be able to prevent users from binding to them 
too.

-- 
Simon Arlott
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