| keystone | Provide authentication using OpenStack Keystone |
| ldap | Provide authentication using simple LDAP binds |
| pam | Authenticate against PAM Provides an authenticate function that will allow the caller to authenticate a user against the Pluggable Authentication Modules (PAM) on the system. |
| stormpath_mod | Salt Stormpath Authentication Module to provide authentication using Stormpath as the backend. |
