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[Bug 1413790] Re: It's possible to bypasss lockscreen if user is in nopasswdlogin group.

To: dx-packages@xxxxxxxxxxxxxxxxxxx
From: "Stephen M. Webb" <stephen.webb@xxxxxxxxxxxxx>
Date: Wed, 11 Feb 2015 16:17:00 -0000
Reply-to: Bug 1413790 <1413790@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: unity
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1413790

Title:
  It's possible to bypasss lockscreen if user is in nopasswdlogin group.

Status in Unity:
  Fix Released
Status in unity package in Ubuntu:
  Fix Released

Bug description:
  Lightdm should not emit logind "unlock" signal when the user is not
  prompted for a password. This can lead to a security issue:

  # Log-in (unity session).
  # Add the current user to nopasswdlogin group.
  # Lock the sessions.
  # Session indicator->Switch account...
  # "Login" in again.

  Expected behavior:
  The lockscreen is still active.

  Current behavior:
  The session in unlocked.

  We could workaround the issue directly in unity, but IMHO would be
  cleaner to avoid that lightdm is emitting the logind signal.

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