In VMware Integrated OpenStack, authentication and identity management are provided by the Keystone component. In addition to SQL-backed OpenStack users, you can also configure authentication through LDAP or through identity federation.
For more information about Keystone, see the OpenStack Keystone documentation.
VMware Integrated OpenStack supports identity federation with VMware Identity Manager as the identity provider. You can also implement federation with a third-party identity provider over the SAML 2.0 protocol, but this is not supported by VMware.