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

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Date:	Sun, 10 Jan 2010 20:45:30 -0500
From:	Michael Stone <michael@...top.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
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>,
	Michael Stone <michael@...top.org>
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

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
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