Wordpress MediaWiki Cookie Integration

The primary problem you are going to run into is that you'll have two login forms, and two logout methods. What you need to do is pick one of the login forms as the default, and redirect the other one over to it.

I've been able to successfully integrate bbPress + MediaWiki + WordPress + WordPress MU, but I wrote a lot of custom code to do it.

I'm using the bbPress login page as the default (and .htaccess rewrite to /login/), and then I created my own MediaWiki authentication plugin (which looks a lot like the one you are using), except my plugin checks the WordPress/bbPress cookie for the login information and automatically logs the user in.

I created a customized /logout/ link that runs the bbPress logout, and also kills the MediaWiki cookies at the same time.

Then the last step was to redirect all of the other logout / login links for bbpress, mediawiki, etc, over to my consolidated one. I used .htaccess rewrites for this rather than mess with core code.

Still a work in progress, but it works fairly well.

You could consider some kind of single-sign-on software. I am unaware of any that are free and I've only ever used SiteMinder which is neither free nor good. Crowd may be better (but is again not free).

I've seen a setup going through Invision Power Board, using IpbWiki and a Wordpress integration mod. Mind you, it's expensive and excessive.