[users] Nagios 3.2.3 SELinux

Frank Bures lisfrank at chem.toronto.edu
Wed Jan 5 16:12:57 CET 2011


Scott Reese wrote:
> Greetings:
> 
> I've been looking at the SELinux policy as it relates to Nagios.  It's
> been a learning experience, and I now fully understand why people just
> turn SELinux off.  What a hassle.  In any event, I've isolated the
> issues, and I'm looking for advice from those of you who package
> software around here on which way of solving the problem is best.
> 
> RedHat is shipping a Nagios SELinux policy module as part of their base
> selinux-policy package.  It has a few problems, some major, some minor. 
> The major one, which causes Nagios to not be able to start if SELinux is
> set to Enforcing is that the policy expects certain Nagios files to be
> in one place, but they are somewhere else.  The problem is in the /var
> directory structures.  RedHat expects Nagios to put its files into the
> existing /var structures.  PID files go in /var/run, spool files (which
> Nagios is using to get results back from the plugins) in
> /var/spool/nagios, etc.  The way that Nagios is packaged, however, is
> different.  It creates a /var/nagios directory structure, and puts all
> of its files in there.  Since the files aren't where the SELinux policy
> expects them to be, it generates denials and Nagios doesn't work.
> 
> So, the options boil down to change the Nagios packages to fit the
> shipping RedHat SELinux policy, or modify the SELinux policy to match
> the shipping Nagios package.  My question is, which do you think is the
> best way to go?
> 
> Yury had previously asked if the SELinux policy could be packaged and
> shipped with the Nagios RPMs.  The infrastructure to do that is built
> into the RPM packaging system, so it would be a possibility.  What I
> haven't figured out is how that would interact with the policy module
> that RedHat is shipping as part of the base package.  I don't know if
> RedHat would have to remove that module from the package, or if just
> shipping a module with a higher version number would replace the RedHat
> module with the Nagios module.

One can leave the Nagios structure intact and just create a local SELinux
policy related to it.  Local policies are not wiped-out during SELinux
policy updates and as you stated, rpm provides tools for such purposes.

Cheers
Frank

-- 

<feeb at chem.toronto.edu>



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