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[Launchpad Bug Tracker <1582242@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.19.2-0ubuntu1

---------------
lightdm (1.19.2-0ubuntu1) yakkety; urgency=medium

  * New upstream release:
    * Add support for greeters running inside sessions. This is enabled by
      setting X-LightDM-Allow-Greeter inside the session .desktop file.
      The session can then use liblightdm to connect one greeter to the
      daemon. The communication is done using a socket
      (/var/run/lightdm/<user>/greeter-socket) that is accessible to any
      process run by that user. Consider controlling access to this socket
      using a MAC system such as AppArmor. (LP: #1582242)
    * Report errors for all liblightdm methods. This will require existing
      greeters to update their API usage. The ABI is unchanged.
    * Handle EAGAIN correctly when daemons communicate with the daemon.
    * Drop support for mir-container sessions - no-one ever used these.
  * debian/liblightdm-gobject-1-0.symbols:
    - Updated

 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>  Wed, 29 Jun 2016
15:29:17 +1200

** Changed in: lightdm (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1582242

Title:
  Support a user-session mode for authenticating

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.18 series:
  Fix Committed
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Xenial:
  Fix Committed
Status in lightdm source package in Yakkety:
  Fix Released

Bug description:
  [Impact]
  Ubuntu phone development requires in session greeter functionality to perform suitably. This functionality does not exist in current versions of LightDM.

  [Test Case]
  1. Install a session that supports in session greeter
  2. Log into that session
  3. Activate greeter functionality

  Expected result:
  It works

  Observed result:
  The functionality is not implemented.

  [Regression Potential]
  Some risk of changing existing behaviour, reduced by regression tests still passing. Functionality is only enabled for sessions that opt-in to this behaviour so additional security risks is limited to new sessions.

  Original description:

  We talked about this in person in Prague.

  Ideally a greeter could run as in the user's session and act as a
  lockscreen for the user as well as a way to authenticate/log-in as
  other users.

  This would let us avoid running a whole other session for the greeter
  on the phone, which is memory intensive.

  It might be easiest for unity8 if that API was still just liblightdm,
  just running in a special mode.  But I'm not picky on how it's done.

  There may be security questions around this.  I asked Jamie and Tyler
  about it, I'll post any concerns from them.

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