We have our PHP application that requires authentication, and for our clients that run SharePoint we'd like to offer some kind of SSO service, so that the users can use their SharePoint credentials (we did something similar with Google Apps, CAS, ...)
Note: Obviously, our app is not hosted on the same domain/premices as SharePoint
I can't find the litterature about it, so any pointer would be welcome !
NB: we'd like to implement a proper tier authentification mechanism, so that the user can log into our app directly by typing the URL, and choose to login using SharePoint, exactly like you'd do with OAuth and the like...
Thanks in advance !