Running your own IdP?

[Tommy van der Vorst]

I'd like to run my own identity provider linked to (maybe) an LDAP or unix
directory backend. I found a lot of libraries for PHP and Python, but
neither of them seem to explain how to set up your own identity provider.
I've found no examples of setting up your own IdP whatsoever. 

Can someone explain me how I can set up my own IdP? I think this should be
made easier to allow incorporation of OpenID in existing authentication
structures.

Tommy.