OAuth Protocol

You can configure the CAS server with:

• OAuth client support, which means authentication can be delegated through a link on the login page to a CAS, OpenID or OAuth provider.
• OAuthn server support, which means you will be able to communicate with your CAS server through the OAuth 2.0 protocol, using the Authorization Code grant type.

CAS OAuth Server Support

Three new urls will be available:

• /oauth2.0/authorize
  It’s the url to call to authorize the user: the CAS login page will be displayed and the user will authenticate. After successful authentication, the user will be redirected to the OAuth callback url with a code. Input GET parameters required: client_id and redirect_uri.

• /oauth2.0/accessToken
  It’s the url to call to exchange the code for an access token. Input GET parameters required: client_id, redirect_uri, client_secret and code.

• /oauth2.0/profile
  It’s the url to call to get the profile of the authorized user. Input GET parameter required: access_token. The response is in JSON format with all attributes of the user.

Delegate to an OAuth Provider

Using the OAuth protocol, the CAS server can also be configured to delegate the authentication to an OAuth provider (like Facebook, Twitter, Google, Yahoo…)