One of the great advantages of openLDAP is that so many services can integrate with it. In this video we authenticate Apache http users to the openLDAP directory hosted SUSE 11.
The specific authentication options in the Directory section httpd,conf are
AuthType Basic AuthName "Test Login" AuthBasicProvider ldap AuthzLDAPAuthoritative off AuthLDAPURL ldap://serverip/ou=people,dc=domain,dc=com?uid?sub require valid-user
In addition to the authz_default_module, authz_basic_module the httpd server will also need the following modules loaded to support authentication to LDAP