Using user data from another project

Hi,

i have 2 sites that use the standard Django authentication system.
I use the first site, say site A, as the site to manage logon's.
My point is to achieve that when a user is logged in on site A, he/she is automatically logged in on site B.

Now, when a user visits site B, he/she gets redirected to site A to get authenticated (Active Directory)
After I authenticate the user, i would want to use that User object in site B.

Sending the session key of site A to site B doesn't work as the projects have their own database.
I then tried to put the user object on the cache (i use memcached) and sending the cache key to site B.
I can get the user object in site B but when i want to log in using the standard
login(request, user); i get this error message:

django.core.exceptions.ImproperlyConfigured
ImproperlyConfigured: Error importing authentication backend siteA.auth.ldap_authenticate: "No module named siteA.auth.ldap_authenticate"

I need to set the user object in site B to get the user info (I display the username on every page amongst other data)

Is that even possible?
Are there other (easy) ways to achieve cross site login?

Thanks,
Benedict

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