def setup_authentication(pau):
    """Set up pluggable authentication utility.

    Sets up an :py:class:`zope.pluggableauth.interfaces.IAuthenticatorPlugin` and
    :py:class:`zope.pluggableauth.interfaces.ICredentialsPlugin` (for the authentication mechanism)
    """
    pau.credentialsPlugins = ['credentials']
    pau.authenticatorPlugins = ['users']
