So in addition to installing the LDAP plugin for MediaWiki, I’ve also found a great page that discusses forcing users to login to MediaWiki.
http://www.mediawiki.org/wiki/Manual:$wgGroupPermissions

Basically copy and paste the code on that page into your LocalSettings.php file. I chose to stick with permissions for random users (*) and logged in users (users). You may actually have groups and what not that you want to do more with. This was simple enough to do…but it was RIDICULOUSLY hard to find this page, mostly because I kept searching for password protecting your MediaWiki. So I’m archiving it here for my own future reference.