netdev - Re: Real networking namespace

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Date:	Fri, 09 Oct 2009 12:37:26 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	linux-security-module@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>, netdev@...r.kernel.org,
	Paul Moore <paul.moore@...com>,
	James Morris <jmorris@...ei.org>
Subject: Re: Real networking namespace

On Fri, 2009-10-09 at 08:38 -0700, Stephen Hemminger wrote:
> The existing networking namespace model is unattractive for what I want,
> has anyone investigated better alternatives?
> 
> I would like to be able to allow access to a network interface and associated objects
> (routing tables etc), to be controlled by Mandatory Access Control API's.
> I.e grant access to eth0 and to only certain processes.  Some the issues
> with the existing models are:
>   * eth0 and associated objects don't really exist in filesystem so
>     not subject to LSM style control (SeLinux/SMACK/TOMOYO)
>   * network namespaces do not allow object to exist in multiple namespaces.
>     The current model is more restrictive than chroot jails. At least with
>     chroot, put filesystem objects in multiple jails.
> 
> Since one of the first rules of security is "don't reinvent", surely
> others have dealt with this issue. Any good ideas?

Is there something that prevents you from using the existing SELinux
network access controls?  netif is a security class governed by SELinux
policy, and routing table operations would be covered by the SELinux
checks on netlink_route_socket.  SELinux uses a combination of LSM hooks
and netfilter hooks to mediate network operations.

-- 
Stephen Smalley
National Security Agency

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