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[Mateusz Stachowski <1413790@xxxxxxxxxxxxxxxxxx>]

** Tags removed: verification-needed
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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 7.2 series:
  In Progress
Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Trusty:
  Fix Committed

Bug description:
  [IMPACT]
  A user is presented with a password dialog even if a member of the nopasswdlogin group (and may not have a password).

  [TEST CASE]

  (1) Create a test user.
  (2) Add the test user to the nopasswdlogin group.
  (3) Log in to a Unity session using that acocunt.
  (4) Lock the screen.
  (5) Attempt to unlock the screen:  no password prompt should be presented.

  [REGRESSION POTENTIAL]

  Conceivably allowing a login with no authentication could present
  unexpected vulnerabilities in which unforseen code paths also exercise
  this function.  Care has been taken by the developer to avoid such
  cases.

  [OTHER INFO]

  The fix for Ubuntu 14.04 LTS was cherry picked from the Ubuntu "Vivid
  Vervet" dev release where it has been in production use for some time
  without apparent regression.

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