From: Casey Schaufler <casey@schaufler-ca.com>
To: Tilman Baumann <tilman.baumann@collax.com>
Cc: Linux-Kernel <linux-kernel@vger.kernel.org>,
linux-security-module@vger.kernel.org
Subject: Re: SMACK netfilter smacklabel socket match
Date: Wed, 10 Dec 2008 16:03:11 -0800 [thread overview]
Message-ID: <494058BF.9010801@schaufler-ca.com> (raw)
In-Reply-To: <4909DB7A.7040209@collax.com>
Tilman Baumann wrote:
>
>
> Casey Schaufler wrote:
>> Tilman Baumann wrote:
>>>> If you're up to trying out something that you know is going to get
>>>> rewhacked before it goes in anywhere let me know.
>>>
>>> Sure. I will be happy to use that.
>>> Just tell me where to find it and how to use it and what I should
>>> look out for.
>>>
>>
>> You'll need to start out with Paul Moore's testing tree:
>>
>> % git clone git://git.infradead.org/users/pcmoore/lblnet-2.6_testing
>>
>> Apply the attached patch (attachments are discouraged for review
>> purposes,
>> but this is handier for this purpose) and compile.
>>
>> This is NOT production code. Again, we're hashing out the netlabel
>> api and
>> we know that they are going to change. This is demo only. The amount of
>> testing it's gotten is really small.
>>
>> I have created a new system label "@", pronounced "at" and referred
>> to as
>> the internet label. Processes cannot be assigned the internet label. A
>> subject with the internet label (as identified by a packet thus labeled)
>> can write to any object and any subject can write to an object thus
>> labeled,
>> thereby explicitly blowing a hole in the Access Control Policy.
>>
>> Have fun, let me know what you hit next.
>
> Sorry for the long delay. I was annoyingly occupied with other things.
My turn!
>
> I just tried this out. But one thing makes me wonder if I had
> understood what it should do.
> The syntax for /smack/slhost is IP[/MASK] LABEL.
> When I give one host (in my case generously 0.0.0.0/0 *g*) a label
> what is the significance of the @ label?
> First I used the _ label here which had the effect that everything
> seems to work but labeled processes still produced labeled packet
> which got slaughtered in different ways and degrees over the internet.
> If I gave my slhost the @ label my machine was offline and did not
> even get pings out locally.
>
> I get the feeling I did not understand the concept yet.
> Sorry but if you don't mind giving me a hint...
>
OK, Paul and I knocked our heads together until we got the behavior and
interfaces ironed out if not to our mutual satisfaction at least to a
workable level. Paul's next tree:
% git clone git://git.infradead.org/users/pcmoore/lblnet-2.6_next
has the current version. There are a couple interesting things going on.
- /smack/nltype is gone. It never lived up to its promise and is no
longer required to determine the labeling scheme.
- /smack/netlabel replaces the earlier /smack/slhost because it better
describes what it gets used for.
- The "@" label (pronounced "web") has been added to the list of special
labels. A packet with the web label will get delivered anywhere. A
network address specified to have the web label can be written to by
any process. Processes can not have the web label.
- An incoming packet from an address in the netlabel list that has a
CIPSO
label attached will still use the label from the CIPSO packet.
- An unlabeled packet coming from an address in the netlabel list
will be
given the label associated with that address.
- A process that wants to send a packet to an address on the list needs
write access to the label associated with that address. The packet
will
be sent unlabeled if it is allowed.
So, if I want my old Sony to be treated as a single-label host with the
label "Pop" I can say:
# echo 192.168.1.102/32 Pop > /smack/netlabel
If I want the secondary network for my development machines to be
single-label
# echo 192.168.2.0/24 Snap > /smack/netlabel
And if I want everyone to be able to communicate with my spam server
# echo 207.69.188.187 '@' > /smack/netlabel
next prev parent reply other threads:[~2008-12-11 0:10 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-25 17:25 SMACK netfilter smacklabel socket match Tilman Baumann
2008-09-25 18:26 ` Paul Moore
2008-09-25 19:26 ` Tilman Baumann
2008-09-25 19:57 ` Paul Moore
2008-09-25 20:32 ` Tilman Baumann
2008-09-26 12:35 ` Tilman Baumann
2008-09-26 19:55 ` Paul Moore
2008-09-26 3:43 ` Casey Schaufler
2008-09-26 8:19 ` Tilman Baumann
2008-09-27 5:01 ` Casey Schaufler
2008-09-29 16:21 ` Tilman Baumann
2008-09-30 3:29 ` Casey Schaufler
2008-10-01 11:29 ` Tilman Baumann
2008-10-01 15:21 ` Casey Schaufler
2008-10-01 16:55 ` Tilman Baumann
2008-10-01 18:22 ` Casey Schaufler
2008-10-06 12:57 ` Tilman Baumann
2008-10-06 23:05 ` Ahmed S. Darwish
2008-10-07 2:42 ` Casey Schaufler
2008-10-17 16:57 ` Tilman Baumann
2008-10-17 17:53 ` Casey Schaufler
2008-10-20 12:06 ` Tilman Baumann
2008-10-20 15:01 ` Casey Schaufler
2008-10-22 3:36 ` Casey Schaufler
2008-10-30 16:06 ` Tilman Baumann
2008-10-31 3:46 ` Casey Schaufler
2008-12-11 0:03 ` Casey Schaufler [this message]
2008-12-11 10:18 ` Tilman Baumann
2008-12-11 16:29 ` Casey Schaufler
2008-10-23 11:55 ` Paul Moore
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=494058BF.9010801@schaufler-ca.com \
--to=casey@schaufler-ca.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=tilman.baumann@collax.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).