I would like to implement/use (if it already exists) an SSO solution for drupal and status.net. Something like AuthDrupal for Mediawiki. A google search did not bring up anything.
When a user signs in on status.net it also does in drupal and vice-versa. It also has to change the status.net register and login links to the corresponding drupal pages
Any ideas?
CAS is a good choice. Drupal and StatusNet have their own CAS Authentication plugin. And you should setup Tomcat for CAS server.