title: How to authorize user who logged in using external login in Asp.Net MVC
body: <p><strong>Introduction</strong>
  I am working with authorization in application, registered users are authorized on role based for some actions/controllers i.e </p>
  
  <pre><code>[Authorize(Roles = "Developer,Admin,User")]
  </code></pre>
  
  <p>My question is, What if a user is logged in using external login method like facebook or google, how to authorize him.</p>
  
  <p>What should be or can be done to achieve this, if someone know about that then please do help. Thanks for your time.</p>