How can I transfer a logged in user's login data from one server to another?

Posted by Martin on Server Fault See other posts from Server Fault or by Martin
Published on 2011-01-30T20:50:49Z Indexed on 2011/01/30 23:27 UTC
Read the original article Hit count: 267

Filed under:

php

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webserver

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authentication

I have one server "A" where users can login. Login is verified by an LDAP server "L". I have a different server "B" were users can log in, too. Login is verified by the same LDAP server as before. Both servers are standard web servers with PHP.

My goal is: If a user is logged in to server "A", and if he clicks a link to log in to server "B", the user should automatically be logged in without re-entering username and password. What is a good and secure way to achieve this? I can't submit username and crypted password to server "B". I can't use the PHP session of server "A", because it does not exit on "B". Cookies won't work either.

I think that there is a way, but I just can't see it. Any help is very much appreciated.

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