linux-kernel - Re: SMACK netfilter smacklabel socket match

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Message-ID: <48F8C3EC.1030607@collax.com>
Date:	Fri, 17 Oct 2008 18:57:16 +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

Hi Casey,

the last weeks I tried to come up with some way to circumvent my 
problems by aimlessly poking around in the code. Did not work though. 
Not yet at least. :)
Maybe it makes more sense for me to wait until you have a solution.
My whole project is stalled right now because of this and I'm not sure 
what next.
Do you plan to change something there soon? If so I would stop wasting 
my time with hopeless attempts.

My problem is at the moment that I don't really know what to do. If you 
can give some aim I would be glad if I could do something.

Thanks

Casey Schaufler wrote:
> Tilman Baumann wrote:
>> Casey Schaufler wrote:
>>> Tilman Baumann wrote:
>> This might work well in trusted networks.
>> But Internet is untrusted and needs to work too. At least in the most 
>> real world scenarios. :)
> 
> Yes. I'm pretty close to convinced that it needs to be included as
> part of the single-label host solution. Not that it can possibly be
> excused in any real secure environment mind you.
> 
>>>> If i set /smack/nltype to 'unlabled' i don't even get SYN packets 
>>>> out. (operation not permitted)
>>>
>>> That's probably a bug, but I think the "fix" is to disable the 
>>> ability to
>>> set the nltype to anything other than CIPSO at least for the time being.
>>
>> Well, there is a case statement in smack_lsm.c that checks for the 
>> nltype (smack_net_nltype) and omits net labeling if cipso is not set.
>> This seems to be a very sensible thing to do. I strongly advice for a 
>> way to omit netlabel based access control.
> 
> Yes, I hear you.


-- 
Tilman Baumann
Software Developer
Collax GmbH . Boetzinger Strasse 60 . 79111 Freiburg . Germany

p: +49 (0) 89-990157-0
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