title: passwordless ssh authentication using active directory
body: <p>Our current infrastructure uses ssh keys for passwordless login to our Linux servers.
  As our infrastructure grows, managing these authorised keys is getting harder.</p>
  
  <p>As we also have an Active Directory (AD) server, I would like to authenticate the users over ssh using this mechanism, but maintain the passwordless nature of ssh keys.</p>
  
  <p>Is it possible to authenticate the users over ssh without password, using some AD mechanism?</p>