I have a simple question - are there any free extensions for Joomla 2.5.x or 3.x that can incorporate Single sign-on using a Shibboleth in Joomla? I can even consider ActiveDirectory as a possibility.
Well the one I'm aware of is JMapMyLDAP, it supports SSO with HTTP for LDAP directories and has support for OpenLDAP as well as commercial solutions such as Microsoft Active Directory and Novell eDirectory.
Had the same issue but not just for Shibboleth, ADFS and for some other Identity Providers too.
Came across this plugin - Joomla Plugin
It serves my purpose and supports way more IDPs than I even know about.