netdev - Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

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Message-ID: <20100114092250.GA11500@atrey.karlin.mff.cuni.cz>
Date:	Thu, 14 Jan 2010 10:22:51 +0100
From:	Pavel Machek <pavel@....cz>
To:	Valdis.Kletnieks@...edu
Cc:	Michael Stone <michael@...top.org>,
	James Morris <jmorris@...ei.org>, 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>,
	Bryan Donlan <bdonlan@...il.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	"C. Scott Ananian" <cscott@...ott.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Bernie Innocenti <bernie@...ewiz.org>,
	Mark Seaborn <mrs@...hic-beasts.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Am?rico 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>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

> On Tue, 12 Jan 2010 08:59:27 +0100, Pavel Machek said:
> 
> > Well, maybe, but mailer system where first user starts is as a daemon
> > makes sense...
> 
> Does it?  How do you get port 25 open for listening if the first user isn't
> root?  Most *actual* schemes to "launch at first use" that require privs for
> something have used inetd or similar - that program exists for a
> *reason*.

Remember sendmail is setuid root... so it already has the permissions.

Except that proposed disablenetwork would take network connectivity
even from setuid apps.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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