> is it possble to be
> authenticated by SPNEGO but
> authorized by LDAP?

In a word, you can absolutely mix sources of authentication and
attribute release, which is not the same as authorization.  It's
important to clarify that CAS has absolutely no support for
authorization.  It can _facilitate_ authorization via attribute
release using the SAML 1.1. protocol, but it does not perform any user
authorization functions in itself.

> Is SAML useable in this kind of scenarios? How and what your I take special
> care.

Every CAS-enabled application will need to perform its own
authorization, but the SAML-driven attribute release capability of CAS
can provide data from a centralized repository like LDAP to assist the
process.  Some helpful links to get you started:

 - https://wiki.jasig.org/display/CASUM/SAML+1.1
 - https://wiki.jasig.org/display/CASUM/Attributes

M

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