Re: Mounting the news spool

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On Sat, 2006-09-30 at 01:16 +0200, Davide Bolcioni wrote:
> Greetings,
> while attempting to set up leafnode <http://leafnode.sourceforge.net> I 
> had a problem with mounting its spool, /var/spool/news:
> 
> Sep 14 00:36:11 camelot kernel: audit(1158186712.955:375): avc:  denied 
>   { mounton } for  pid=1353 comm="mount" name="news" dev=dm-3 ino=65600 
> scontext=system_u:system_r:mount_t:s0 
> tcontext=system_u:object_r:news_spool_t:s0 tclass=dir
> 
> Using audit2why and then audit2allow I was able to come up with the
> following .te policy:
> 
> module news 1.0;
> 
> require {
>          class dir mounton;
>          type mount_t;
>          type news_spool_t;
>          role system_r;
> };
> 
> allow mount_t news_spool_t:dir mounton;
> 
> which to my untrained eye looked good. Researching the archives before
> writing this, however, I came upon the answer for a similar problem:
> 
>  
> https://www.redhat.com/archives/fedora-selinux-list/2006-August/msg00096.html
> 
> and found out that it would probably have been enough to label the
> mount point mnt_t (haven't tried it yet). Assuming it works, how should 
> I have found out about it ? I tried rpm -qd and found out about the
> selinux-policy documentation, but nothing showed up for the targeted
> policy. In this context, isn't audit2allow somewhat ... dangerous ?
> 
> Or was it just a shortcoming in the leafnode RPM, so I should be looking
> at what INN is doing instead ?

This sort of problem only usually crops up when you add a mountpoint
post-installation. It's not really something that can be anticipated by
packagers of general applications like leafnode (in fact it's a problem
for mount rather than a problem for leafnode). It might be useful for
SELinux diagnostic tools to note that "mounton" problems are usually the
result of a labelling problem rather than a policy problem though.

Labelling the mountpoint as mnt_t should indeed fix this problem.

Paul.

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