IdP authenticate against a REST API

[Peter Schober]

* Aaron Howell <aaron.howell at deakin.edu.au> [2017-02-02 06:53]:
> The users are stored in a propriety system - and I am looking how to
> authenticate them.

Also, assuming that system persists authentication data to an RDBMS
you may be able to use a JAAS JDBC module and authenticate against
that database directly from your existing IDP (or a new one, if you
insist).
-peter