VuFind supports a variety of different mechanisms for controlling user login. You can build a plugin if you need to customize authentication behavior.
Default Namespace: \VuFind\Auth
Base Class: \VuFind\Auth\AbstractBase
Service Locator Configuration Section in module.config.php: ['vufind']['plugin_managers']['auth']
Service Manager Name for Service Locator: VuFind\AuthPluginManager (VuFind 2.x-4.x), VuFind\Auth\PluginManager (VuFind 5.0+)
See the General Plugin Information page for more details on VuFind plugins.