linux-kernel - Re: [PATCH 3/4] security: capabilities patch (version 0.4.4), part 3/4: introduce new capabilities

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Message-ID: <20060917180619.GB2225@elf.ucw.cz>
Date:	Sun, 17 Sep 2006 20:06:19 +0200
From:	Pavel Machek <pavel@....cz>
To:	Joshua Brindle <method@...too.org>
Cc:	James Morris <jmorris@...ei.org>,
	David Madore <david.madore@....fr>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel mailing-list <linux-kernel@...r.kernel.org>,
	LSM mailing-list <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 3/4] security: capabilities patch (version 0.4.4), part 3/4: introduce new capabilities

Hi!

> >>Can a non-root user create limited-rights processes without assistance
> >>from the sysadmin, under SElinux?
> >
> >SELinux uses a restrictive model, where privileges can only be removed, 
> >not added.
> >
> >  
> I think he was asking if a non-admin user can create processes of less 
> privilege without becoming root. The answer is yes, however, it is 
> policy driven. Users will have numerous 'derived' types that are less 
> privilege than, for example, their interactive shell. For example, 
> user_irc_t or user_evolution_t. The transitions will happen when the 
> user runs irc or evolution and those apps will be limited to the rights 
> they require. These are fine grained though, and mandatory. These 
> capabilities are so course grained I just can't see anyone ever using them.

Andrea already has his "seccomp" thing in kernel.... which is
basically "running without _any_ rights". So yes, this is useful.

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