[LightDM] LightDM preloads all users from LDAP

[Kamil Wilczek]

I solved my own problem.

This weird(?) behaviour happens only when accountsservice packet
is not installed. When present, users are no longer preloaded
and logging in behaves sane again :)

Maybe it should be a systemd dependency? gmd3 pulls it by default.
But this is question to the Debian team I guess.

Kind Regards
-- 

W dniu 06.09.2021 o 10:46, Kamil Wilczek pisze:
> Dear Users,
> 
> I setup a Debian Bullseye system with users database in LDAP. I can
> successfully log in, but I have problems with the LightDM.
> 
> On the greeter GUI page when I try to change the focus from the login
> field to the password field, the form freezes and I cannot do
> anything for about 20-30 seconds, then focus changes to password field
> as expected.
> 
> In logs I can see that behind the scenes LightDM loads/adds *all* users
> from my LDAP. All of them, about 10k.
> 
> How to disable this behaviour? Is this an expected behaviour?
> 
> 
> 
> I tried this configuration, but it didn't change anything:
> 
> # lightdm --show-config
>     [Seat:*]
> A  greeter-session=lightdm-greeter
> B  greeter-hide-users=true
> B  session-wrapper=/etc/X11/Xsession
> B  greeter-allow-guest=false
> B  greeter-show-manual-login=true
> B  greeter-show-remote-login=false
> B  allow-guest=false
> 
> Sources:
> A  /usr/share/lightdm/lightdm.conf.d/01_debian.conf
> B  /etc/lightdm/lightdm.conf
> 
> 
> 
> lightm.log shows (I did not set DEBUG anywhere, don't know where it
> comes from):
> 
> [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
> [+0.00s] DEBUG: Starting Light Display Manager 1.26.0, UID=0 PID=523
> [+0.00s] DEBUG: Loading configuration dirs from 
> /usr/share/lightdm/lightdm.conf.d
> [+0.00s] DEBUG: Loading configuration from 
> /usr/share/lightdm/lightdm.conf.d/01_debian.conf
> [+0.00s] DEBUG: Loading configuration dirs from 
> /usr/local/share/lightdm/lightdm.conf.d
> [+0.00s] DEBUG: Loading configuration dirs from 
> /etc/xdg/lightdm/lightdm.conf.d
> [+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
> [+0.00s] DEBUG: Registered seat module local
> [+0.00s] DEBUG: Registered seat module xremote
> [+0.00s] DEBUG: Registered seat module unity
> [+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
> [+0.00s] DEBUG: _g_io_module_get_default: Found default implementation 
> local (GLocalVfs) for ‘gio-vfs’
> [+0.01s] DEBUG: Monitoring logind for seats
> [+0.01s] DEBUG: New seat added from logind: seat0
> [+0.01s] DEBUG: Seat seat0: Loading properties from config section Seat:*
> [+0.01s] DEBUG: Seat seat0 has property CanMultiSession=no
> [+0.01s] DEBUG: Seat seat0: Starting
> [+0.01s] DEBUG: Seat seat0: Creating greeter session
> [+0.01s] DEBUG: Seat seat0: Creating display server of type x
> [+0.02s] DEBUG: Seat seat0: Plymouth is running on VT 1, but this is 
> less than the configured minimum of 7 so not replacing it
> [+0.02s] DEBUG: Quitting Plymouth
> [+0.04s] DEBUG: Using VT 7
> [+0.04s] DEBUG: Seat seat0: Starting local X display on VT 7
> [+0.04s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
> [+0.05s] DEBUG: XServer 0: Writing X server authority to 
> /var/run/lightdm/root/:0
> [+0.05s] DEBUG: XServer 0: Launching X Server
> [+0.05s] DEBUG: Launching process 543: /usr/bin/X :0 -seat seat0 -auth 
> /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
> [+0.05s] DEBUG: XServer 0: Waiting for ready signal from X server :0
> [+0.05s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
> [+0.05s] DEBUG: Registering seat with bus path 
> /org/freedesktop/DisplayManager/Seat0
> [+0.05s] WARNING: Could not enumerate user data directory 
> /var/lib/lightdm/data: Error opening directory '/var/lib/lightdm/data': 
> No such file or directory
> [+1.94s] DEBUG: Got signal 10 from process 543
> [+1.94s] DEBUG: XServer 0: Got signal from X server :0
> [+1.94s] DEBUG: XServer 0: Connecting to XServer :0
> [+1.97s] DEBUG: Seat seat0: Display server ready, starting session 
> authentication
> [+1.97s] DEBUG: Session pid=599: Started with service 'lightdm-greeter', 
> username 'lightdm'
> [+7.82s] DEBUG: Session pid=599: Authentication complete with return 
> value 0: Success
> [+7.82s] DEBUG: Seat seat0: Session authenticated, running command
> [+7.82s] DEBUG: Session pid=599: Running command 
> /usr/sbin/lightdm-gtk-greeter
> [+7.83s] WARNING: Error getting user list from org.freedesktop.Accounts: 
> GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
> org.freedesktop.Accounts was not provided by any .service files
> [+7.83s] DEBUG: Loading user config from /etc/lightdm/users.conf
> DEBUG: .. user ... added
> DEBUG: .. user ... added
> DEBUG: .. user ... added
> DEBUG: .. user ... added
> (10k times)
> ...
> 
> 
> Kind Regards

-- 
Kamil Wilczek  [https://keys.openpgp.org/]
[D415917E84B8DA5A60E853B6E676ED061316B69B]
Laboratorium Komputerowe
Wydział Matematyki, Informatyki i Mechaniki
Uniwersytet Warszawski

ul. Banacha 2
02-097 Warszawa

Tel.: 22 55 44 392
https://www.mimuw.edu.pl/
https://www.uw.edu.pl/

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