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i have 2 sites (example.com, ex2.com). Fisical is a 1 site with 1 db. When user sing in ex2.com, he was sing in example.com too. How do this?
P.S. Can do this with ZF?
I found a very interesting article on this topic. The author gives some ideas how to implement Multidomain authentication.
http://codeutopia.net/blog/2008/09/25/sharing-authentication-over-multiple-sites-single-sign-on/
Have you looked into OpenID? You could lock OpenID consumer “ex2” to allow logins only from your “example.com” OpenID provider.
I am also digging the subject. Some time ago, I already did my own implementation and got it terribly wrong.
At the moment I am wondering whether to setup an own OpenID provider and locking consumer sites to accept only it. Another alternative would be yet another own implementation with a CAS style setup, where only a hash is passed via the browser, and the user verification is done server-to-server in the background using the hash as a disposable key.
I am not yet sure which one to pick or would some third alternative be better.