> 1) is it possible to use ldap groups in cas as a way for limiting/allowing
> user access?

It sounds like you are describing a centralized authorization system,
for which CAS has no direct support.  The CAS authorization model is
decentralized where services are responsible for making their own
authorization decisions.  CAS can facilitate authorization by
providing data via the SAML attribute release feature,
http://www.ja-sig.org/wiki/display/CASUM/Attributes.

It's straightforward to send group membership data from your LDAP via
attribute release and let your CAS-enabled services make authorization
decisions.  We do this and it works splendidly.

> 2) is it possible to define user exclusion lists?

Again, this is a concern for each CAS-enabled service.

M

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