[Bug 1582242] Re: Support a user-session mode for authenticating

[Launchpad Bug Tracker]

This bug was fixed in the package lightdm - 1.18.3-0ubuntu1

---
lightdm (1.18.3-0ubuntu1) xenial; urgency=medium

  * New upstream release:
- Fix error that caused stdin to be closed. This seems to have lots of bad
  side effects (greeter not working correctly, multi-seat failing).
- 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//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)
- Fix various memory management issues exposed by the use of in-session
  greeters.
  * debian/patches/lp1605117.patch:
- Applied upstream

 -- Robert Ancell   Fri, 12 Aug 2016
11:37:43 +1200

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

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Title:
  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

** Tags removed: verification-needed
** Tags added: verification-done

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Title:
  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Michael Terry]

Oh, I think I remember confirming it at one point yeah.

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  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

Michael - can you confirm if this is fixed in the SRU?

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

1.18.3 should contain all those changes backported...

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  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Michael Terry]

Can we not backport 1.19.3?  That has a few crashing issues with in-
session greeters.  There are fixes in trunk though, so 1.19.4 would be
better.

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Title:
  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Timo Aaltonen]

Hello Michael, or anyone else affected,

Accepted lightdm into xenial-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/lightdm/1.18.3-0ubuntu1 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Tags added: verification-needed

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

** Changed in: lightdm/1.18
   Status: Fix Committed => Fix Released

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  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

** Changed in: lightdm/1.18
Milestone: None => 1.18.3

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  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Launchpad Bug Tracker]

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//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   Wed, 29 Jun 2016
15:29:17 +1200

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

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Title:
  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

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

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Title:
  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

** Also affects: lightdm/1.18
   Importance: Undecided
   Status: New

** Changed in: lightdm/1.18
   Status: New => Fix Committed

** Changed in: lightdm/1.18
   Importance: Undecided => Medium

** Changed in: lightdm/1.18
 Assignee: (unassigned) => Robert Ancell (robert-ancell)

** Changed in: lightdm (Ubuntu Xenial)
   Status: New => Fix Committed

** Changed in: lightdm (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: lightdm (Ubuntu Xenial)
 Assignee: (unassigned) => Robert Ancell (robert-ancell)

** Changed in: lightdm (Ubuntu Xenial)
   Importance: Medium => Critical

** Changed in: lightdm (Ubuntu Xenial)
   Importance: Critical => High

** Description changed:

+ [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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[Bug 1582242] Re: Support a user-session mode for authenticating

[Launchpad Bug Tracker]

** Branch linked: lp:lightdm/1.18

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

** Also affects: lightdm (Ubuntu Yakkety)
   Importance: High
 Assignee: Robert Ancell (robert-ancell)
   Status: Fix Committed

** Also affects: lightdm (Ubuntu Xenial)
   Importance: Undecided
   Status: New

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

This is now in lp:lightdm. To make an in-session greeter you need to set
X-LightDM-Allow-Greeter=true in the session .desktop file. Then you can
run a greeter using liblightdm from inside that session.

Only one greeter is allowed at once. Any process from the logged in user
can connect (so there is a denial of service risk if the correct process
doesn't get the socket first or loses it).

The socket is called /var/run/lightdm//greeter-socket. For
security purposes it's probably worth locking this down with AppArmor
rules.

** Changed in: lightdm (Ubuntu)
   Status: In Progress => Fix Committed

** Also affects: lightdm
   Importance: Undecided
   Status: New

** Changed in: lightdm
   Status: New => Fix Committed

** Changed in: lightdm
Milestone: None => 1.19.2

** Changed in: lightdm
   Importance: Undecided => Medium

** Changed in: lightdm
 Assignee: (unassigned) => Robert Ancell (robert-ancell)

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  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Launchpad Bug Tracker]

** Branch linked: lp:lightdm

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Title:
  Support a user-session mode for authenticating

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[Bug 1582242] Re: Support a user-session mode for authenticating

[Robert Ancell]

** Changed in: lightdm (Ubuntu)
   Status: New => Triaged

** Changed in: lightdm (Ubuntu)
   Importance: Undecided => High

** Changed in: lightdm (Ubuntu)
   Status: Triaged => In Progress

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