title: Zend Framework 2 - Global check for authentication with ZFCUser
body: <p>I installed <code>ZFCUser</code> successfully. Now I wonder if there is a way to <strong>globally</strong> check for authentication.</p>
  
  <p>As outlined <a href="https://github.com/ZF-Commons/ZfcUser/wiki/How-to-check-if-the-user-is-logged-in">in the wiki</a> there are several ways to check for auth. They all work but do I have to put the check-if-clause really in <strong>every single</strong> action? All my sites should be only accessable when beeing logged in and if not, you should be rerouted to the login page.</p>
  
  <p>Does anybody know if there's a central place where I can put this logic?</p>