[refpolicy] fcontexts for XDG_RUNTIME_DIR /run/user

[cpebenito@tresys.com (Christopher J. PeBenito)]

On 4/12/2016 1:02 PM, Jason Zaman wrote:
> On Tue, Apr 12, 2016 at 10:43:33AM -0400, Christopher J. PeBenito wrote:
>> On 4/11/2016 1:11 PM, Jason Zaman wrote:
>>> Hi all,
>>>
>>> I submitted patches to add USERID and USERNAME to genhomedircon[1] and
>>> am now trying to fix refpol to work with it.
>>>
>>> What labels do we want for things in /run/user?
>>> Currently refpol has the following which seems pretty weird:
>>> /var/run/user(/.*)? gen_context(system_u:object_r:var_auth_t,s0)
>>> It was originally added from fedora but fedora has since dropped that.
>>>
>>> fedora now has:
>>> /var/run/user(/.*)? gen_context(system_u:object_r:user_tmp_t,s0)
>>>
>>> The problem with that fcontext is that users have write perms towards
>>> user_tmp_t so they would be able to do other things in /run/user/
>>> instead of only within /run/user/%{USERID}/.
>>>
>>> I think we should have some kind of _root_t and _home_t like how things
>>> are for /home and /home/USERNAME
>>
>> This makes sense.
> 
> so this?
> /var/run/user system_u:object_r:xdg_runtime_root_t:s0
> /var/run/user/1000 staff_u:object_r:xdg_runtime_home_t:s0
> 
> Once the patches get merged in to the userspace tools I will start
> preparing patches for this.
> 
[...]
>> Which group (if any) specified how /run/user/UID should be used? XDG?
> 
> https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
> 
> I think systemd started it, but ConsoleKit2 supports it too and it is
> officially a freedesktop/XDG spec.

I think it makes more sense for these not to be XDG-named types, since
XDG isn't the only one that uses it.  Perhaps something like
user_runtime_root_t and user_runtime_t, or maybe user_runtime_t and
user_tmp_t (I'm open to other suggestions).

-- 
Chris PeBenito
Tresys Technology, LLC
www.tresys.com | oss.tresys.com