Thanks Bill, this was very helpful.  I will take a look at Apache
Shiro and see if this will meet my needs.

On Wed, May 16, 2012 at 5:10 PM, William G. Thompson, Jr.
<wgt...@gmail.com> wrote:
> Jamie,
>
>> ...can support revoking a users access and having that take effect  
>> immediately.  Is there a way to do this in CAS?
>
> That somewhat depends on what "take effect immediately" means.  There
> is code in the community to do ABAC at the CAS server (there will be
> presentation on this at Jasig in June).   So a tweak to an LDAP
> attribute would "immediately" prevent further Service Tickets (i.e.
> access) form being vended to the application in question for that
> particular user.
>
> However, CAS is not an application session manager, so an already
> in-flight application session would not be effected.
>
> Apache Shiro claims to support this behavior and might be option for
> Java based applications.  Shiro also has some support for CAS.
>
> http://shiro.apache.org/
>
> Best,
> Bill
>
>
>
> On Wed, May 16, 2012 at 4:31 PM, Jamie Johnson <jej2...@gmail.com> wrote:
>> We currently are using CAS and Spring Security to secure several
>> applications and have been asked by our customer to investigate how we
>> can support revoking a users access and having that take effect
>> immediately.  Is there a way to do this in CAS?  My first thought was
>> to add a SAML Ticket Validator and a custom SAML Attribute Repository
>> which would have the most up to date roles/access controls.  Is this
>> appropriate?  Is there a better way to handle this?
>>
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