We have a wikifarm with a number of wikis and central media repositories. We are missing a single sign-on - presently, if someone is signed into a wiki and uploads a file, this one has to sign in a second time.
The "obvious" solution is to do the same as wikimedia, i.e. http://www.mediawiki.org/wiki/Extension:CentralAuth
However, the page above warns in no unclear words to rather use $wgSharedDB (which we already do). But while this offers single-authorization ("password storage"), it provides no single-sign on.
Advice? What are our options?
thanks!
Gregor