php - Single Session Login in Laravel

Question

I'm trying to implement a user policy whereby only one user can login at a time. I'm trying to build this on top of Laravel's Auth driver.

I've thought of using the Session driver to store the sessions in the database and make the keys constant for each username. This is probably a terrible implementation because of session fixation.

What would the implementation be like? What methods in the Auth driver should I be editing? Where would the common session key be stored?

Answer 1

I recently did this.

My solution was to set the session value when a user logs in. Then I had a small class checking if the session ID stored is the same as the current user who is logged in.

If the user logs in from somewhere else the session ID in the DB will update and the "older" user will be logged out.

I didn't alter the Auth driver or anything, just put it on top when the user logs in. Below happens when login is successful:

$user->last_session = session_id();
$user->save();

To check if the session is valid I used below

if(session_id() != Auth::user()->last_session){
   Auth::logout();
   return true;
}

As you can see I added a column in the users table called last_session