Login to Your Salesforce Org with OpenID Connect in Winter ’14
The Winter ’14 release includes OpenID Connect Authentication Providers, allowing your org to be an OpenID Connect Client, and leverage an Authorization Server for user login. Let’s take a look at how this works: If you want to walk through the protocol in detail, there’s an excellent, detailed description on Google’s Developer site. (Source) http://blogs.developerforce.com/developer-relations/2013/09/login-to-your-salesforce-org-with-openid-connect-in-winter-14.html