linux-kernel - Re: [RFC] Privilege dropping security module

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Message-ID: <20091001073853.GA1330@ucw.cz>
Date:	Thu, 1 Oct 2009 09:38:53 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andy Spencer <andy753421@...il.com>
Cc:	Casey Schaufler <casey@...aufler-ca.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Privilege dropping security module

On Wed 2009-09-23 22:31:10, Andy Spencer wrote:
> > Hi Andy. Git is a wonderful tool, but if you want people to review
> > your work you need to post patches.
> 
> Thanks for letting me know, I've posted a separate message with patch.
> 
> 
> > And what do you propose as an interesting use case for dpriv?
> 
> I think the two most important things about dpriv is that it can be used
> by ordinary users and that is can create policies programmatically.
> 
> Being able to use dpriv as a non root user is pretty strait forward. For
> example, a user of a multi-user system may want to try some untrusted
> code without risking access to the rest of the system:
> 
>   $ cd ~/my_project
>   $ echo rxRX   /                > /sys/kernel/security/dpriv/stage
>   $ echo X      $HOME            > /sys/kernel/security/dpriv/stage
>   $ echo rwxRWX $HOME/my_project > /sys/kernel/security/dpriv/stage
>   $ echo commit                  > /sys/kernel/security/dpriv/control
>   $ patch < untrusted.patch
>   $ make && ./src/some_exe

Yeah, and now your ~/.ssh/identity is being uploaded to remote server.

I believe people are already sandboxing apps with selinux...

...and subterfugue certainly does what you want, using
ptrace... no kernel mods needed and should already be secure.

								Pavel 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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