linux-kernel - Re: [PATCH] Implement file posix capabilities

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Date:	Wed, 24 Jan 2007 12:24:18 -0800 (PST)
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Bill O'Donnell <billodo@....com>,
	KaiGai Kohei <kaigai@...gai.gr.jp>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Chris Friedhoff <chris@...edhoff.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: [PATCH] Implement file posix capabilities


--- Bill O'Donnell <billodo@....com> wrote:

> ... That said, can one expect, through
> the use of these enhanced capabilities,
> to be able to add some finer grain 
> capabilities based on a specific userid?

POSIX capabilities are explictly disjoint from
userids in the kernel, and this is by design.
You could provide limited capability sets to
users at the application layer.

> In Chris' ping example,
> the suid is removed from /bin/ping to restrict it to
> root, and a 
> capability added to allow any user to execute it. 
> Can that example
> be extended to make it so only a _particular_ user
> can execute it?

Give the file the capability and set an
ACL that allows only that user execute access.

> I realize with SELinux, one could achieve the goal,
> but as a stopgap,
> can capabilities be used to get there?

Certainly, as above.

> Thanks,
> Bill
> 
> -- 
> Bill O'Donnell
> SGI

Have a look in /etc/irix.cap on a Trix box
some time. I suspect there might be one in
your facility.



Casey Schaufler
casey@...aufler-ca.com
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