I learned to do this using an example from Dan's blog.  The comments happen to describe the exact scenario you're describing.

http://danwalsh.livejournal.com/66587.html?thread=397339#t397339

On Wed, Feb 18, 2015 at 2:53 AM, Cretu Adrian <adycrt@gmail.com> wrote:

Hi,
Is there a way I can permit a user confined by selinux to run rpm but the scriptlets to be executed in user's domain type instead of rpm_script_t ?

I have a use case where I need to permit some users to install rpms but in same time I need to confine them so would not interfere with files that define network interfaces/kernel and so on.

Thanks

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Jeremy Young, M.S., RHCSA