Use gateway feature:
http://www.ja-sig.org/wiki/display/CAS/gateway

2007/10/2, Pablo Gra~na <[EMAIL PROTECTED]>:
> Hi there. I need to do something very specific with CAS. I want to know
> in certain service if I am already logged in to CAS. Let me expand a
> little bit:
>
> Suppose I have two services. One of them (service1) forces me to log in
> to CAS. The other one (service2) has two modes: an anonymous mode and a
> logged in mode. The problem is that I need to know in service2 if I am
> logged in service1 (or in CAS).
>
> One option would be, when a user has no session in service2, redirect to
> CAS with some request parameter. This parameter indicates CAS that it
> should not present the user a login page, just redirect with the token
> if the user has already logged in, or with some other parameter to
> notify that the user has not logged in.
>
> Is this possible? Any hints?
>
> Thanks a lot.
>
> --
> Pablo Gra\~na
> Chief Architect
> Globant
> Arg Office: +54 (11) 4109 1743
> UK  Office: +44 (20) 7043 8269 int 8043
> US  Office: +1 (212) 400 7686 int 8043
>
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