Re: [refpolicy] Labeling home directories in refpolicy

["Justin P. Mattock" <justinmattock@gmail.com>]

On 05/12/2010 09:44 AM, Alan Rouse wrote:
> Running genhomedircon creates file_contexts.homedirs but it is pretty sparse:
>
>    
>> #
>> # Home Context for user unconfined_u
>> #
>>
>> /home/a?quota\.(user|group)	--	system_u:object_r:quota_db_t:s0
>> /home/lost\+found/.*	<<none>>
>> /home	-d	system_u:object_r:home_root_t:s0
>> /home/\.journal	<<none>>
>> /home/lost\+found	-d	system_u:object_r:lost_found_t:s0
>>      
> In the source rpm the file policy/modules/system/userdomain.fc differs between fedora and refpolicy.  The refpolicy version just has
>
>    
>> HOME_DIR	-d	gen_context(system_u:object_r:user_home_dir_t,s0-mls_systemhigh)
>> HOME_DIR/.+		gen_context(system_u:object_r:user_home_t,s0)
>>
>> /tmp/gconfd-USER -d	gen_context(system_u:object_r:user_tmp_t,s0)
>>      
> But the fedora version has
>
>    
>> HOME_DIR	-d	gen_context(system_u:object_r:user_home_dir_t,s0-mls_systemhigh)
>> HOME_DIR	-l	gen_context(system_u:object_r:user_home_dir_t,s0-mls_systemhigh)
>> HOME_DIR/.+		gen_context(system_u:object_r:user_home_t,s0)
>> /tmp/gconfd-USER -d	gen_context(system_u:object_r:user_tmp_t,s0)
>> /root(/.*)?	 	gen_context(system_u:object_r:admin_home_t,s0)
>> /dev/shm/pulse-shm.*	gen_context(system_u:object_r:user_tmpfs_t,s0)
>> /dev/shm/mono.*		gen_context(system_u:object_r:user_tmpfs_t,s0)
>> HOME_DIR/\.cert(/.*)?	gen_context(system_u:object_r:home_cert_t,s0)
>> HOME_DIR/\.pki(/.*)?    gen_context(system_u:object_r:home_cert_t,s0)
>> HOME_DIR/\.gvfs(/.*)?	<<none>>
>> /root/\.cert(/.*)?		gen_context(system_u:object_r:home_cert_t,s0)
>>      
> I don't see the answer to my labeling problems in the fedora version.  Am I missing something?  Or is there a different .fc that gets involved in correctly labeling user home directories?
>
> -----Original Message-----
> From: Stephen Smalley [mailto:sds@tycho.nsa.gov]
> Sent: Wednesday, May 12, 2010 10:48 AM
> To: Justin P. Mattock
> Cc: Alan Rouse; refpolicy@oss1.tresys.com; selinux@tycho.nsa.gov
> Subject: Re: [refpolicy] Labeling home directories in refpolicy
>
> On Wed, 2010-05-12 at 07:31 -0700, Justin P. Mattock wrote:
>    
>> On 05/12/2010 07:11 AM, Stephen Smalley wrote:
>>      
>>> On Wed, 2010-05-12 at 10:04 -0400, Alan Rouse wrote:
>>>
>>>        
>>>> I'm trying to adapt a recent refpolicy snapshot (May 4) to OpenSUSE.
>>>> (Previously I adapted the Fedora 12 policy, more as a learning
>>>> exercise.)  Now I'm finding that the refpolicy is not labeling home
>>>> directories properly (they all end up as default_t after "fixfiles -F
>>>> relabel").   I'm running unprivileged users as user_u and root as
>>>> sysadm_u, so I expect corresponding labels on files in the home
>>>> directory.  Is there a special mechanism for getting the home dirs
>>>> labeled consistent with the corresponding selinux user, or do I need
>>>> to define labeling for the files individually in a new module?   And
>>>> how do files in the home dir such as .ssh (which should have a type
>>>> other than user_t) get their types?
>>>>
>>>> Or perhaps something is broken in the distribution that is causing
>>>> labels from the refpolicy not to be applied in the home dir?
>>>>
>>>> Any insights would be appreciated!
>>>>
>>>>          
>>> Did you build with MONOLITHIC=n?
>>>
>>>
>>>        
>> I've noticed some funkyness with the home dir labels as well i.g.
>> id -Z
>> name:staff_r:staff_t:s0
>> but the labels go
>> name name user_r:object_r:user_home_t:s0 if I add a new file the
>> labels get set right name name name:object_r:user_home_t:s0
>>
>> maybe something is astray in genhomedircon!
>> (genhomedircon line#13)
>>      
> The genhomedircon functionality is part of libsemanage these days, and /usr/sbin/genhomedircon is just a compatibility script that does:
> #!/bin/sh
> /usr/sbin/semodule -Bn
>
> i.e. rebuild policy in order to regenerate the file_contexts.homedirs file.
>
> So if policy is monolithic, I'm not sure you get any file_contexts.homedirs at all.
>
> --
> Stephen Smalley
> National Security Agency
>
>
>    
hm.. what I can do is a bisect on refpolicy,
and userspace tools to see what I find.
(will be in a few days or so..)

Justin P. Mattock

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