netdev - Re: disablenetwork (v5): Require CAP

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Date:	Sat, 16 Jan 2010 20:58:27 -0800
From:	"Andrew G. Morgan" <morgan@...nel.org>
To:	Michael Stone <michael@...top.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, David Lang <david@...g.hm>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Bryan Donlan <bdonlan@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	James Morris <jmorris@...ei.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Bernie Innocenti <bernie@...ewiz.org>,
	Mark Seaborn <mrs@...hic-beasts.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Samir Bellabes <sam@...ack.fr>,
	Casey Schaufler <casey@...aufler-ca.com>,
	"Serge E. Hallyn" <serue@...ibm.com>, Pavel Machek <pavel@....cz>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kyle Moffett <kyle@...fetthome.net>
Subject: Re: disablenetwork (v5): Require CAP_SETPCAP to enable

On Sat, Jan 16, 2010 at 8:48 PM, Michael Stone <michael@...top.org> wrote:
> Andrew Morgan wrote:
>>
>> Please use CAP_NET_ADMIN for this feature (and add the corresponding
>> comment in include/linux/capabilities.h).
>
> Sure.
> However, to make sure I understand the purpose of the adjustment, would you
> mind saying a word or two about what considerations cause you to recommend
> CAP_NET_ADMIN instead of (or in addition to?) CAP_SETPCAP?

If you take a look at the capabilities.h file, you'll see that each of
the capabilities is preceded by an explanation of what privilege it
enables.

CAP_SETPCAP refers to privileged manipulation of capabilities
(permission to violate the normal capability rules) and nothing to do
with the network.

You are adding something akin to a per-process tree firewall setting -
deny/enable network access to this process. I think you'll agree that
the CAP_NET_ADMIN description is a much better match for this.

Cheers

Andrew

>
> Thanks for your feedback,
>
> Michael
>
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