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fedora-selinux: Re: eggdrop policy module

Re: eggdrop policy module

From: Dominick Grift <domg472_at_nospam>
Date: Wed Mar 30 2011 - 11:52:48 GMT
To: Luciano Furtado <lrfurtado@yahoo.com.br>

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On 03/30/2011 01:46 PM, Luciano Furtado wrote:
> On 11-03-28 05:06, Dominick Grift wrote:
>> On 03/28/2011 02:32 AM, Luciano Furtado wrote:
>
>>> Hi guys,
>
>>> I started creating my policy module for the eggdrop irc bot. I am
>>> getting stuck on simple task. I want to add a transition from
>>> unconfined_t to eggdrop_t when I run a eggdrop_exec_t file.
>
>>> This is what I have:
>
>>> policy_module(eggdrop, 1.0.0)
>
>>> ########################################
>>> ## Declarations#gen_require(`
>>> type unconfined_t;
>>> ')
>>> type eggdrop_t;
>>> type eggdrop_exec_t;
>
>>> application_executable_file(eggdrop_exec_t)
>
>> This is not required, it is in "application_domain() which you should
>> call. lack of application_domain(eggdrop_t, eggdrop_exec_t) is whats
>> causing the constraint violation.
>
>> Also allow the unconfined_r role the eggdrop_t domain:
>
>> role unconfined_r types eggdrop_t;
>
>> (you also will need to require "role unconfined_r;")
>
>
>>> type eggdrop_conf_t;
>>> files_config_file(eggdrop_conf_t)
>
>>> corenet_tcp_connect_ircd_port(eggdrop_t)
>>> corenet_tcp_sendrecv_ircd_port(eggdrop_t)
>
>>> domain_auto_trans(unconfined_t,eggdrop_exec_t,eggdrop_t)
>
>> Better use domtrans_pattern() instead of domain_auto_trans. It better
>> fits the requirements:
>
>> domtrans_pattern(unconfined_t, eggdrop_exec_t, eggdrop_t)
>
>
>> so a basic standard template to start is:
>
>> ----------->8--------------
>
>> policy_module(eggdrop, 1.0.0)
>
>> gen_require(`
>> type unconfined_t;
>> role unconfined_r;
>> ')
>
>> type eggdrop_t;
>> type eggdrop_exec_t;
>> application_domain(eggdrop_t, eggdrop_exec_t)
>> role unconfined_r types eggdrop_t;
>
>> type eggdrop_etc_t;
>> files_config_file(eggdrop_etc_t)
>
>> domtrans_pattern(unconfined_t, eggdrop_exec_t, eggdrop_t
>
>> -------------8<------------
>
>
>
>
>>> This is what I get when I try to load this policy module:
>
>
>>> lrfurtado:~/selinux/eggdrop# make load
>>> Loading default modules: eggdrop
>>> /usr/sbin/semodule -i eggdrop.pp
>>> libsepol.check_assertion_helper: neverallow violated by allow
>>> unconfined_t eggdrop_t:process { transition };
>>> libsemanage.semanage_expand_sandbox: Expand module failed
>>> /usr/sbin/semodule: Failed!
>>> make: *** [tmp/loaded] Error 1
>>> lrfurtado:~/selinux/eggdrop#
>
>
>>> What's the proper way of accomplishing this?
>
>
>
>>> On 11-03-25 15:24, Dominick Grift wrote:
>>>> On 03/25/2011 08:16 PM, Luciano Furtado wrote:
>>>>> Thanks Dominick,
>
>>>>> I will use this as an exercise on how to create a new policy module. I
>>>>> hope you guys can tolerate my newbie questions for a while.
>
>>>> I created some screen casts and put them on youtube that show some of this:
>
>>>> Write a policy module part 1 to 4 (on fedora):
>
>>>> part 1: http://www.youtube.com/watch?v=s4EyoW_7riQ
>>>> part 2: http://www.youtube.com/watch?v=G5gUt1-ttGg
>>>> part 3: http://www.youtube.com/watch?v=nbFnchVAgYs
>>>> part 4: http://www.youtube.com/watch?v=rUGBgzTr92A
>
>>>> Some other examples:
>
>>>> part 1: http://www.youtube.com/watch?v=sBI50O84NLo
>>>> part 2: http://www.youtube.com/watch?v=ATTJ5xUKH1E
>>>> part 3: http://www.youtube.com/watch?v=e3cQNi3bi70
>
>>>> may or may not be helpful.
>
>>>>> Best Regards.
>>>>> Luciano
>
>
>>>>> On 11-03-25 14:29, Dominick Grift wrote:
>>>>>> On 03/25/2011 07:09 PM, Luciano Furtado wrote:
>>>>>>> Hi Group,
>
>>>>>>> Does eggdrop has a selinux policy module? if so starting on which fedora
>>>>>>> version?
>
>
>>>>>> The only reference that i could find to it was:
>
>>>>>> "You can find a copy of my irssi policy here
>>>>>> http://pastebin.ca/768256?srch=irssi_exec_t it also includes policy for
>>>>>> eggdrop and manual pages"
>
>>>>>> - From my 2008 article
>>>>>> "http://domg472.blogspot.com/2008/05/how-to-create-integrate-and-rebuild.html"
>
>>>>>> Unfortunately seems "pastebin.ca" no longer exists. I can no longer
>>>>>> access the site.
>
>
>>>>>>> I am looking to get the sources for it , build / install it on my Debian
>>>>>>> installation which doesn't seem to have a module for it.
>
>
>>>>>>> Best Regards.
>>>>>>> Luciano
>
>
>
>
> On my policy right now I have this which I think would allow eggdrop to
> sendrecv packet to any host/port combination
>
> corenet_tcp_sendrecv_all_ports(eggdrop_t)
>
>
> If wanted to limit eggdrop to talk only to specific host/port would it
> possible to use iptables to label the packets to to something like
> eggdrop_packet_t and them add a rule like this.
>
> corenet_tcp_recvfrom_labeled(eggdrop_t, eggdrop_packet_t)
>
>
> Is this the right approach to accomplish this.

I am not into the selinux networking controls but dwalsh recently
published an article that may or may not inspire you:

http://www.linux.com/learn/tutorials/421152-using-selinux-and-iptables-together

>
> My WIP policy is locate at http://lrfurtado.vps.bitfolk.com/eggdrop/

I probably would have done it differently, but if it works; it works.

>
>
>
> Best Regards.
> Luciano
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