Dear experts,
I've been struggling to find out information on 3rd party authentication integration to the ACS. I know that ACS can use external databases, but this is not what I'm looking for.
I have someone, who wishes to use ACS for user authentication and at the same time develop real single sign-on to their corporate infrastructure. I have the product that can deliver this Single Sign-On, but thus far I've been able to reduce Sign-Ons to two (ACS and then Single Sign-On).
What I would like to know is, that can I implement a third party authentication _before_ ACS authentication. In this scenario the 3rd party authentication server would be the first point of contact. After successfully receiving the user credentials from the user, the authentication server would forward this inforamtion to ACS. So is there any kind of descriptions / API documentation on how to implement this? If this is possible, my customer could get real single sign-on to multitude of Intranet services and continue utilizing the ACS investment.
