Creating "dynamically configured" directories on a per-user basis

["Sebastian J. Bronner" <waschtl@sbronner.com>]

I want to offer an addressbook-service for the users of my system similar to 
the what IMAP does for email:

With IMAP, users' mail is delivered into a special directory in their home 
directory, and they may retrieve it at their whim (without any need for setup 
on their part, besides configuring their client).

So, I want to have another special directory in users' home directories 
(perhaps named LDAPdir) which will hold the database files for their 
addressbook.  I currently have an LDAP namespace that looks like:

dc=sbronner,dc=com
	ou=groups
		gid=...
	ou=users
		uid=...

stored in /usr/var/openldap.  The users' addressbooks would be added to the 
namespace as follows:

uid=john,ou=users,dc=sbronner,dc=com
	ou=addressbook
		cn=...

This requires that I configure in /etc/openldap/slapd.conf access to each 
users' directory by the corresponding user.  Now, this is where the dynamic 
comes in: I don't want to put an entry for each user in this file, but rather 
some sort of formula that would tell slapd to allow john access to the 
directory in /home/john/LDAPdir.

All pointers and suggestions welcome.
-- 
Sebastian J. Bronner
waschtl@sbronner.com