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:

https://github.com/joshsoftware/sso-devise-omniauth-provider
https://github.com/joshsoftware/sso-devise-omniauth-client

Overview here:

http://blog.joshsoftware.com/2010/12/16/multiple-applications-with-devise-omniauth-and-single-sign-on/

Walter