LDAP Authentication

I am currently setting up various environments to allow our developers to
login to Postgresql using their LDAP password. Also limiting the servers
they can access.

I have successfully setup LDAP and setup simple authentication using simple
bind. This was my test case. Now I need to move to the next lever which
would be search and bind. This will allow me to grant access to particular
servers for some people. I am not sure where or how the ldapsearchattibute
comes into play.

For example, this would be the search filter I will
use: (&(objectClass=posixAccount)(uid=$username)(|(host=$hostname)(host=$fqdn)(host=\\*)))

So it makes sure that the object class is possixAccount and the user id is
$username, next match is, host = $hostname or host = $fqdn or host = *.
These are attributes on the user's account.

How will Postgres match the username? How does it pass it to the query,
everything else I can hardcode into the search filter.

Would an ldapurl be better here? But again how will I pass the uid to the
ldapurl?

Thanks,
-Joseph Kregloh