Opplet

Opplet (Russian: Оплёт; hereinafter, the Software) is user management software, which is integrated through API with authorization and authentication systems. Opplet.net is its user interface.

OpenStack

The Software shall be integrated with the native OpenStack Keystone authorization system of OpenStack using the output on the LDAP protocol.

Keystone is an OpenStack's Identity API. It supports LDAP, OAuth, OpenID Connect, SAML and SQL. ... [Keystone] does not actually implement any user-management functions; rather, it provides plug-in interfaces so that organizations can leverage their current authentication services.

Currently, the programming interface of Opplet is simpleSAMLphp, but, if required, it will be replaced with LDAP.