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fedora-selinux: Re: nginx policy

Re: nginx policy

From: Dominick Grift <domg472_at_nospam>
Date: Fri Mar 18 2011 - 19:14:41 GMT
To: Kurian Thayil <kurianmthayil@gmail.com>

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On 03/18/2011 08:07 PM, Kurian Thayil wrote:
> Hi Dominick,
>
> How can we say that confining nginx with Apache Module policy works? Both

It was tested by Mossburg and he confirmed that httpd policy works for
nginx.

> are http server. But they both work in different ways, libraries, functions
> they look up are different.

libraries are labelled with generic types (lib_t, shlib_t), and so these
can be used by any domain. These libraries do not have module specific
types. This is a design property of refpolicy.

 So shouldn't we need to write a new policy for
> nginx (eventhough its quite hectic and too too complex)? Just a thought.

No, not if httpd_t domain works fine for it. Currently lighttpd also
runs in the httpd_t domain.

>
> Regards,
> --Kurian.
>
> On Fri, Mar 18, 2011 at 4:35 PM, Dominick Grift <domg472@gmail.com> wrote:
>
> On 03/18/2011 11:41 AM, Mossburg wrote:
>>>> On Mon, Mar 14, 2011 at 11:58 AM, Mossburg <mossburg79@gmail.com> wrote:
>>>>>>>> On 03/14/2011 10:07 AM, Mossburg wrote:
>>>>>>>>> I'm currently trying to write a policy for the nginx webserver.
>>>>>>>>
>>>>>>>> It is probably better to make this webserver run in the httpd_t
> domain.
>>>>>>>
>>>>>>> It was my first idea but i didn't if it was a good idea to use an
>>>>>>> existing policy, written for a specific process.
>>>>>>>
>>>>>>>> That means that you would have to add file context specifications for
>>>>>>>> some files included with the nginx package:
>>>>>>>>
>>>>>>>> its executable file, configuration file, pid file, log, lib and init
>>>>>>>> script file.
>>>>>>>
>>>>>>> To make it permanent i would have to write a policy only with a .fc
> file ?
>>>>>>>
>>>>>>>> You did not include your nginx.fc file and so i cannot suggest these
>>>>>>>> changes.
>>>>>>>
>>>>>>> # nginx executable will have:
>>>>>>> # label: system_u:object_r:nginx_exec_t
>>>>>>> # MLS sensitivity: s0
>>>>>>> # MCS categories: <none>
>>>>>>>
>>>>>>> /usr/sbin/nginx --
> gen_context(system_u:object_r:nginx_exec_t,s0)
>>>>>>
>>>>>> to test (temporary label)
>>>>>> chcon -t httpd_exec_t /usr/sbin/nginx
>>>>>>
>>>>>> to make it permanent locally
>>>>>> semanage fcontext -a -t httpd_exec_t /usr/sbin/nginx
>>>>>>
>>>>>>> /var/run/nginx.pid
> gen_context(system_u:object_r:nginx_var_run_t,s0)
>>>>>>
>>>>>> semanage fcontext -a -t httpd_var_run_t /var/run/nginx.pid
>>>>>>
>>>>>>> /var/log/nginx(/.*)?
> gen_context(system_u:object_r:nginx_var_log_t,s0)
>>>>>>
>>>>>> to test (temporary label)
>>>>>>
>>>>>> chcon -R -t httpd_log_t /var/log/nginx
>>>>>>
>>>>>> to make permanent locally
>>>>>>
>>>>>> semanage fcontext -a -t httpd_log_t "/var/log/nginx(/.*)?"
>>>>>>
>>>>>>> /var/lib/nginx(/.*)?
> gen_context(system_u:object_r:nginx_var_lib_t,s0)
>>>>>>
>>>>>> chcon -R -t httpd_var_lib_t /var/lib/nginx
>>>>>>
>>>>>> semanage fcontext -a -t httpd_var_lib_t "/var/lib/nginx(/.*)?"
>>>>>>
>>>>>>> /etc/nginx(/.*)?
> gen_context(system_u:object_r:nginx_conf_t,s0)
>>>>>>
>>>>>> chcon -R -t httpd_config_t /etc/nginx
>>>>>>
>>>>>> semanage fcontext -a -t httpd_config_t "/etc/nginx(/.*)?"
>>>>>>
>>>>>> use existing apache locations/types:
>>>>>>
>>>>>> default system webroot:
>>>>>>
>>>>>> /var/www
>>>>>>
>>>>>>
>>>>>> you can also just add the above fc specs to a .fc file (you may need to
>>>>>> require the types used in the fc file in your te file)
>>>>>>
>>>>>> Instead i would just use chcon or semanage fcontext plus restorecon.
>>>>>> Once you confirmed that it works, you can suggest your changes upstream
>>>>>> so that Fedora /refpolicy can make the changes to the apache module.
>>>>
>>>>
>>>> Hi Dominick,
>>>>
>>>> What you suggested seems to work. Thanks again for your help.
>>>> How can i suggest this changes upstream ?
>>>>
>
> I have submitted a patch upstream here:
>
> http://oss.tresys.com/pipermail/refpolicy/2011-March/004135.html
>
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