[Zope] Doing authentification on my own

[Florian Lindner]

Hello,
I want to do authentification whithout a userfolder.
It should work like this:
The login credentials are submitted from a form to a script. This script 
  looks up the user data in a SQL-database and redirect to a 
login-failed page if the form-data is wrong. If the form-data is right 
is constructs a userObject and redirects a a loginok page or to 
$destination.
Problems:
- Constructing a userObject? How to do that? How to make it clear to 
Zope that this session is authentificated? Is this done with the 
construction of the userObjekt?
- How to define the login-page to which Zope redirects if a anon-user 
tries to  access protected content? The requested URL should be passed 
as a parameter ($destination) to the login-page.

Is this possible?
Thanks,
Florian