How to implement SSO in ruby

hi all i am trying to implement SSO in ruby on rails site . is there
any chance to implement SSO .
kindly help out

Thanks in advance

Check out

http://code.google.com/p/rubycas-server/

and

http://code.google.com/p/rubycas-client/

Also, if you’re using Devise, these work pretty well:

Overview here:

Walter