### Authentication Model
    $config['auth_mechanism'] = "sso"; # default, other options: ldap, http-auth
    $ssoPrefix = "X-CAS-";
    $config['sso']['create_users'] = true;
    $config['sso']['update_users'] = false;
    #$config['sso']['email_attr'] = $ssoPrefix . "email_primary";
    $config['sso']['realname_attr'] = $ssoPrefix . "displayName";
    $config['sso']['descr_attr'] = $ssoPrefix . "displayName";
    $config['sso']['user_attr'] = $ssoPrefix . "User";
    $config['sso']['mode'] = "env";
    $config['sso']['group_strategy'] = "map";
    $config['sso']['group_attr'] = $ssoPrefix . "eduPersonScopedAffiliation";
    $config['sso']['group_delimeter'] = ",";
    $config['sso']['group_level_map'] = [
            'employee@psdept 123' => 5,
    ];