Apache: Authentication and authorization against an LDAP server
mod_psldap is an Apache module for leveraging LDAP services built on the OpenLDAP library and the Apache APIs, to include web based A&A, web based updates to the LDAP store, server-side XSLT processing, and session management across servers.

Features
- Functions against a secure LDAP server
 - Does not require administrative access to the LDAP server
 - LDAP connection configurations can be set within a base URL
 - Multiple LDAP servers can be utilized for authentication
 - Management of search scope for identifying user to authenticate
 - Configurable user, group, and password attribute selection
 - Allows password comparison in the module or in the LDAP server
 - Kerberos authentication to the LDAP server
 - Identifies group membership based on an attribute value in the LDAP record
 - Leverages LDAP based groups for authentication
 - Is capable of cookie based authentication
 - Caches authentication results to avoid excessive LDAP related traffic
 - Integration of user account maintenance
 - Web based directory lookups
 - Improved look and feel with card based, tabular, and editable views of LDAP records
 - Tree based browse mechanism
 - VCF export capability
 - Handheld device support
 - Support for browsers that do not perform XSLT.