Inability to shutdown or reboot from gnome

[Shahms King]

This bug isn't related to SELinux (it appears with SELinux enabled,
disabled and permissive).  Additionally, the ability to shut down the
computer as a regular user is only available to local logins, meaning it
is an almost non-existent security problem.  If a user has physical
access to the computer, they have complete control of the computer. 
Allowing them to shutdown and reboot becomes a data integrity issue at
that point (if a user, present at the console, cannot restart the
computer in the "proper" way, they can *always* power cycle it.)  All of
that being said, the "unknown user" bug is really irritating ...
-- 
Shahms King <shahms at shahms.com>