SSO with CAS or OAuth?

Question

I wonder if I should use the CAS protocol or OAuth + some authentication provider for single sign-on.

Example Scenario:

1. A User tries to access a protec

Answer 1

I tend to think of it this way:

Use CAS if you control/own the user authentication system and need to support a heterogenous set of servers and apps that need centralized authentication.

Use OAuth if you want to support user authentication from systems that you don't own/support (ie Google, Facebook, etc).