[Bug 1627304] Re: User locking problems - guest login crashing

[Launchpad Bug Tracker]

This bug was fixed in the package lightdm - 1.19.5-0ubuntu1

---
lightdm (1.19.5-0ubuntu1) yakkety; urgency=medium

  * New upstream release:
- Fix errors in documentation generation
- Improve documentation
- Fix guest AppArmor profile to allow guest sessions more access to the
  upstart session socket (LP: #1627304)
- Fix small memory leak in liblightdm-gobject keyboard layout code
  * debian/control:
- Drop duplicate dependency on gobject-introspection
- Alphabetically order dependencies
  * debian/guest-session-auto.sh:
- Don't show guest session dialog in MATE (LP: #1627395)

 -- Robert Ancell   Fri, 30 Sep 2016
14:56:00 +1300

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

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[Bug 1627304] Re: User locking problems - guest login crashing

[Robert Ancell]

Uploaded an updated version to Yakkety (1.19.5-0ubuntu1)

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

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[Bug 1627304] Re: User locking problems - guest login crashing

[Gunnar Hjalmarsson]

** No longer affects: gnome-session (Ubuntu)

** No longer affects: lightdm-gtk-greeter (Ubuntu)

** No longer affects: unity-greeter (Ubuntu)

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[Bug 1627304] Re: User locking problems - guest login crashing

[Tyler Hicks]

Assigning the lightdm task to Robert for now since he's already fixed it
upstream.

** Changed in: lightdm (Ubuntu)
 Assignee: Ubuntu Security Team (ubuntu-security) => Robert Ancell 
(robert-ancell)

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[Bug 1627304] Re: User locking problems - guest login crashing

[Tyler Hicks]

@robert-ancell I tested your proposed change to the lightdm AppArmor
abstraction and can confirm that it allows the guest session to start
for me. Thanks for looking into the denials and getting that fixed!

I see that you committed the fix upstream. Do you plan on making another
lightdm upload before Yakkety is released in order to fix this bug?

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

** No longer affects: xubuntu-default-settings (Ubuntu)

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

@robert-ancell - reverted (Xubuntu) to our old default settings, undid
this change and everything works as before.

Change to xubuntu-default-settings was something pitti appears to have
done

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

@robert-ancell - tested that on Xubuntu (bug 1627310) works fine there
using something other than light-locker (we have a seperate issue there
bug 1622303)

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[Bug 1627304] Re: User locking problems - guest login crashing

[Robert Ancell]

Note you can test changes like this by running:
$ sudoedit /etc/apparmor.d/abstractions/lightdm
$ sudo systemctl reload apparmor.service

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[Bug 1627304] Re: User locking problems - guest login crashing

[Launchpad Bug Tracker]

** Branch linked: lp:lightdm

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[Bug 1627304] Re: User locking problems - guest login crashing

[Robert Ancell]

The following fix to the abstraction seems to fix the issue:

=== modified file 'data/apparmor/abstractions/lightdm'
--- data/apparmor/abstractions/lightdm  2015-10-19 10:44:23 +
+++ data/apparmor/abstractions/lightdm  2016-09-28 03:39:54 +
@@ -95,7 +95,7 @@
   unix (receive) peer=(label=unconfined),
   unix (create),
   unix (getattr, getopt, setopt, shutdown),
-  unix (bind, listen) type=stream addr="@/com/ubuntu/upstart-session/**",
+  unix (bind, listen, accept, receive, send) type=stream 
addr="@/com/ubuntu/upstart-session/**",
   unix (bind, listen) type=stream addr="@/tmp/dbus-*",
   unix (bind, listen) type=stream addr="@/tmp/.ICE-unix/[0-9]*",
   unix (bind, listen) type=stream addr="@/dbus-vfs-daemon/*",

I figure that something (Unity?) is now making more use of the upstart
session. So we need to allow all operations on it.

I'm not an upstart expert but I figure this is safe to allow?

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[Bug 1627304] Re: User locking problems - guest login crashing

[Tyler Hicks]

Marking the apparmor task as invalid since the changes will likely need
to be made to the profile shipped by lightdm.

** Changed in: apparmor (Ubuntu)
   Status: Incomplete => Invalid

** Changed in: lightdm (Ubuntu)
 Assignee: (unassigned) => Ubuntu Security Team (ubuntu-security)

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[Bug 1627304] Re: User locking problems - guest login crashing

[Tyler Hicks]

Thanks, I gave it a shot (after putting the profile into complain mode)
and here are the unique denials that I see when starting the guest
session:

operation="mknod" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/1295/fd/2" pid=1295 comm="lightdm-session" requested_mask="c" 
denied_mask="c" fsuid=998 ouid=998
operation="mknod" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/1297/fd/2" pid=1297 comm="lightdm-session" requested_mask="c" 
denied_mask="c" fsuid=998 ouid=998
operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1446 
comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send 
receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/1293" peer_addr=none peer="unconfined"
operation="file_perm" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1293 
comm="upstart" family="unix" sock_type="stream" protocol=0 requested_mask="send 
receive" denied_mask="send" addr="@/com/ubuntu/upstart-session/998/1293" 
peer_addr=none peer="unconfined"
operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1709 
comm="unity-panel-ser" family="unix" sock_type="stream" protocol=0 
requested_mask="send receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/1293" peer_addr=none peer="unconfined"

and when logging out of the guest session:

operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=2042 
comm="dbus-send" family="unix" sock_type="stream" protocol=0 
requested_mask="send receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/1293" peer_addr=none peer="unconfined"
operation="file_perm" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1293 
comm="upstart" family="unix" sock_type="stream" protocol=0 requested_mask="send 
receive" denied_mask="send" addr="@/com/ubuntu/upstart-session/998/1293" 
peer_addr=none peer="unconfined"
operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=2046 
comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send 
receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/1293" peer_addr=none peer="unconfined"
operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1709 
comm="unity-panel-ser" family="unix" sock_type="stream" protocol=0 
requested_mask="send receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/1293" peer_addr=none peer="unconfined"

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

Sep 23 21:42:38 wolf-wolf kernel: [   69.411731] audit: type=1400
audit(1474663358.636:31): apparmor="DENIED" operation="connect"
profile="/usr/lib/lightdm/lightdm-guest-session" pid=3713 comm="initctl"
family="unix" sock_type="stream" protocol=0 requested_mask="send receive
accept" denied_mask="send accept" addr="@/com/ubuntu/upstart-
session/999/3321" peer_addr=none peer="unconfined"

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[Bug 1627304] Re: User locking problems - guest login crashing

[Tyler Hicks]

Hi - are there any AppArmor denials in the syslog? To check, you can
trigger this bug and then look in /var/log/syslog for lines that contain
'apparmor="DENIED"'.  Thanks!

** Changed in: apparmor (Ubuntu)
   Importance: Critical => Undecided

** Changed in: apparmor (Ubuntu)
   Status: Triaged => Incomplete

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[Bug 1627304] Re: User locking problems - guest login crashing

[Iain Lane]

(The security team will look soon)

** Changed in: lightdm-gtk-greeter (Ubuntu)
   Status: Confirmed => Incomplete

** Changed in: xubuntu-default-settings (Ubuntu)
   Status: Confirmed => Incomplete

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[Bug 1627304] Re: User locking problems - guest login crashing

[Iain Lane]

I think this is an issue with the lightdm(-guest-session) apparmor
profiles.

In dmesg:

laney@yakkety-vm:~$ dmesg | grep DENIED
[  142.273990] audit: type=1400 audit(1474905574.718:125): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/sys/kernel/osrelease" pid=2167 comm="pkill" requested_mask="r" 
denied_mask="r" fsuid=998 ouid=0
[  142.274396] audit: type=1400 audit(1474905574.718:126): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/1/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274428] audit: type=1400 audit(1474905574.718:127): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/2/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274457] audit: type=1400 audit(1474905574.718:128): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/3/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274484] audit: type=1400 audit(1474905574.718:129): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/4/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274513] audit: type=1400 audit(1474905574.718:130): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/5/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274542] audit: type=1400 audit(1474905574.718:131): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/6/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274569] audit: type=1400 audit(1474905574.718:132): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/7/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274598] audit: type=1400 audit(1474905574.718:133): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/8/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  142.274626] audit: type=1400 audit(1474905574.718:134): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/9/cmdline" pid=2167 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  147.434462] audit: type=1400 audit(1474905579.878:282): apparmor="DENIED" 
operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=2843 
comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send 
receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/2526" peer_addr=none peer="unconfined"
[  147.450970] audit: type=1400 audit(1474905579.894:283): apparmor="DENIED" 
operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=2855 
comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send 
receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/2526" peer_addr=none peer="unconfined"
[  147.494563] audit: type=1400 audit(1474905579.938:284): apparmor="DENIED" 
operation="connect" profile="/usr/lib/lightdm/lightdm-guest-session" pid=2871 
comm="initctl" family="unix" sock_type="stream" protocol=0 requested_mask="send 
receive accept" denied_mask="send accept" 
addr="@/com/ubuntu/upstart-session/998/2526" peer_addr=none peer="unconfined"
[  147.511922] audit: type=1400 audit(1474905579.954:285): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/sys/kernel/osrelease" pid=2879 comm="pkill" requested_mask="r" 
denied_mask="r" fsuid=998 ouid=0
[  147.512279] audit: type=1400 audit(1474905579.958:286): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/1/cmdline" pid=2879 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  147.512303] audit: type=1400 audit(1474905579.958:287): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/2/cmdline" pid=2879 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  147.512322] audit: type=1400 audit(1474905579.958:288): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/3/cmdline" pid=2879 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  147.512340] audit: type=1400 audit(1474905579.958:289): apparmor="DENIED" 
operation="open" profile="/usr/lib/lightdm/lightdm-guest-session" 
name="/proc/4/cmdline" pid=2879 comm="pkill" requested_mask="r" denied_mask="r" 
fsuid=998 ouid=0
[  147.512356] audit: type=1400 audit(1474905579.958:290): apparmor="DENIED" 
operation="open" 

[Bug 1627304] Re: User locking problems - guest login crashing

[Gunnar Hjalmarsson]

Tested with Ubuntu MATE, and the guest session works fine there, so the
issue is probably not caused by lightdm.

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

>From Xubuntu, see same symptoms as seen previously - that is, can log in
to Guest - logout fails.

Dialogue looks ok for us.

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[Bug 1627304] Re: User locking problems - guest login crashing

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gnome-session (Ubuntu)
   Status: New => Confirmed

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[Bug 1627304] Re: User locking problems - guest login crashing

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xubuntu-default-settings (Ubuntu)
   Status: New => Confirmed

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[Bug 1627304] Re: User locking problems - guest login crashing

[Gunnar Hjalmarsson]

I could reproduce the issue on Ubuntu 16.10. Additional observations:

* Logging in to a guest session fails also when you do it from the
  login screen without being logged in as a regular user, so I doubt
  that the issue is related to screen locking.

* The zenity warning dialog shows up, but without its title bar - can
  it possibly be compiz related? (The rest of the screen is simply
  black.)

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

In Xubuntu we can login to the gues user desktop - but it crashes on
logout rather than logging in.

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

** Also affects: gnome-session (Ubuntu)
   Importance: Undecided
   Status: New

** Also affects: xubuntu-default-settings (Ubuntu)
   Importance: Undecided
   Status: New

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  User locking problems - guest login crashing

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[Bug 1627304] Re: User locking problems - guest login crashing

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: unity-greeter (Ubuntu)
   Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1627304

Title:
  User locking problems - guest login crashing

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[Bug 1627304] Re: User locking problems - guest login crashing

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: lightdm-gtk-greeter (Ubuntu)
   Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1627304

Title:
  User locking problems - guest login crashing

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[Bug 1627304] Re: User locking problems - guest login crashing

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

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

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https://bugs.launchpad.net/bugs/1627304

Title:
  User locking problems - guest login crashing

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[Bug 1627304] Re: User locking problems - guest login crashing

[flocculant]

A similar issue exists in Xubuntu.

Default xubuntu install however does not allow to resume a locked
session at all.

We've experimented with changing locker from light-locker to gnome-
screensaver and xscreensaver - when using gnome-screensaver we see the
same as with the Ubuntu issue.

bug 1622303

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Title:
  User locking problems - guest login crashing

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