Cloned from launchpad blueprint https://blueprints.launchpad.net/keystone/+spec/ldap-authentication-using-compare-method. Description: Scenario: Enterprise utilises a centralised LDAP Direcory for SSO purposes. User management (creation, update, deletion etc... ) realised via LDAP BUI app. Keystone configured to authenticate against the Enterprise LDAP directory (read-only mode). To minimise ldap traffic & simplify the authentication process is it possible to implement a switch (in conf file) and update python code enabling keystone to use the compare() method for authentication purposes. Specification URL (additional information): None