> I was wondering if anyone has had any success sending ldap groups as 
> authorities through cas.

I believe you mean authority in the sense of authorization data.  CAS
has no direct support for user authorization services of any kind.  As
you noted, however, you can make CAS release attributes that can be
consumed as a source of authorization data on the client.  Many CAS
client applications have support for treating arbitrary attributes as
role data; the Spring Security CAS client does this nicely,
http://static.springsource.org/spring-security/site/docs/3.0.x/reference/cas.html.

> I have setup cas to authenticate and send selected ldap attributes to a test 
> application via the Cas20 protocol.

I hope you will reconsider using the CAS protocol for this.  CAS has
support for releasing attributes via SAML 1.1 protocol,
https://wiki.jasig.org/display/CASUM/SAML+1.1, and many of the clients
have been designed to consume SAML data for integration with
authorization frameworks.  In fact, all the clients that support
authorization (Java, phpCAS, .NET, mod_auth_cas) that I'm aware of use
SAML.

M

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