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/<user>/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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https://bugs.launchpad.net/bugs/1582242
Title:
Support a user-session mode for authenticating
Status in Light Display Manager:
Fix Committed
Status in lightdm package in Ubuntu:
Fix Committed
Bug 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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