linux-kernel - Re: SMACK netfilter smacklabel socket match

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Date:	Fri, 26 Sep 2008 10:19:40 +0200
From:	Tilman Baumann <tilman.baumann@...lax.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org
Subject: Re: SMACK netfilter smacklabel socket match

Am 26.09.2008 um 05:43 schrieb Casey Schaufler:

> Tilman Baumann wrote:
>> Hi all,
>>
>> i made some SMACK related patches. I hope this list is the right  
>> place to post them.
>
> Here and, probably more importantly linux-security-module@...r.kernel.org 
>  as that's
> my primary hang out.
>
>> The intention behind this patch is that i needed a way to  
>> (firewall) match for packets originating from specific processes.
>> The existing owner match did not work well enough, especially since  
>> the cmd-owner part is removed.
>> Then i thought about a way to tag processes and somehow match this  
>> tag in the firewall.
>> I recalled that SELinux can do this (SECMARK) but SELinux would  
>> have been way to complex for what i want. But the idea was born, i  
>> just needed something more simple.
>>
>> SMACK seemed to be the right way. So i made a little primitive  
>> netfilter match to match against the security context of sockets.
>> SMACK does CIPSO labels, but this was not what i wanted, i wanted  
>> to label the socket not the packet (on the wire).
>> This of course only works for packets with a local socket, but this  
>> was my intention anyway.
>>
>> This way i can label a process and all it's sockets carry the same  
>> label which i then can use to match against in the firewall.
>>
>
> Hmm. It looks as if your code will do what you're asking it to do.
> Are you going to be happy with the access restrictions that will be
> imposed by Smack?

I helped myself with rules like this.
_ foo rwx
But i wanted to add some security stuff like selinux for years,
and SMACK seems to be just great.
So i will spend some time making security rules after i got this routing
stuff to work. :)

Regards
  Tilman
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