Facebook, OpenID and Decrypting SSL
I was excited to see Facebook (FB) supporting login via OpenID (FB is a relying party), and I decided to give it a whirl. Here I list the results of my investigation, which describe the odd use of OpenID, as well as my wire level analysis which I hope you find informative. This post doesn't go into details of how OpenID works, if you're interested in that leave a comment and I'll put up such a post. FB uses OpenID in a way I've never seen before. In the "common" OpenID login model, you get a login page that shows you some sort of login via OpenID buttons. When you go to the FB login page there is no login via OpenID. This confused me, but I went to my FB account settings and linked my google account to my FB account. (Attempts to link my MyOpenID account failed with a strange error message). After some trial and error I realized that if I was logged into my Google account and went to the FB page than I'd automatically get logged into FB. Debugging