title: Is there a way in Magento to store/manage frontend user authentification outside ? (LDAP,etc.)
body: <p>I'm working on a multi-site project (half of them are Magento stores), and I'd like to have only one entry point for all the users, transparent for the user, everything in the same system/database for all the sites. </p>
  
  <p>I'd like to know if there's alternatives to the core user authentification ? I saw that there's LDAP plugins, but only for the backend access. Is there anything for the frontend authentification ?</p>