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

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Message-ID: <20100111174922.GA17285@us.ibm.com>
Date:	Mon, 11 Jan 2010 11:49:22 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Michael Stone <michael@...top.org>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	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>,
	Samir Bellabes <sam@...ack.fr>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Pavel Machek <pavel@....cz>, Al Viro <viro@...IV.linux.org.uk>,
	Kyle Moffett <kyle@...fetthome.net>
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

Quoting Michael Stone (michael@...top.org):
> Tetsuo Handa wrote:
> 
> >Michael Stone wrote:
> >>Examples of software that I want to be able to gain privileges normally include:
> >>
> >>   rainbow, which requires privilege in order to add new accounts to the system
> >>   and in order to call setuid() but which does not require networking
> >>   privileges.
> >
> >If the system is not using local files (i.e. /etc/passwd and /etc/shadow),
> >the process who wants to add new accounts to the system might need network
> >access (e.g. to LDAP server), doesn't it?
> 
> General purpose account manipulation tools might need network access but
> rainbow handles all its account manipulations via state stored in
> /var/spool/rainbow/2. This state is made available to the rest of the system
> via libnss_rainbow.
> 
> Michael

Michael, I'm sorry, I should go back and search the thread for the
answer, but don't have time right now - do you really need
disablenetwork to be available to unprivileged users?  Or is it ok
to require CAP_SETPCAP (same thing required for dropping privs from
bounding set)?  Surely rainbow could be started either with that
capability, or even from a smaller, easier-to-audit wrapper that
has the capability, calls disablenetwork, then launches rainbow?

-serge
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