SSO via a separate authenticating application?

SSO via a separate authenticating application?

We have a need to authenticate users via a separate web application then pass the user on to other trusted web applications, one of which is ServiceDesk Plus.  In other words, we need SSO where another application is performing authentication, then (for example) passing the trusted token on to ServiceDesk.  A federated security solution looks like it might be a good fit for our other applications (for example Windows Identity Foundation services) and I wanted to know if this could be made to work with ServiceDesk, or if support for this type of authentication is planned.
 
Thanks,
 
Mike

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