nobody user

[Plisgyn]

After the last update "nobody" now appears as a login option, it never used to. Any ideas why?

[doktor5000]

Which login manager do you use, and what is the default shell for the nobody user ?

[Plisgyn]

I use KDM and in Control Centre - Users Groups there is no entry for nobody under Users

[doktor5000]

What Mageia release, mga5 ? And yes you won't find nobody under users in MCC unless you enable to show hidden system users.

[Plisgyn]

Sorry its mga5

[amigo7]

I confirm this bug in mga5.
Not only the user 'nobody', but also all users which were previously hidden are shown in the login screen.

[wildlynx]

Now MCC cannot see Nobody, even with "Filter out system users" checkbox ticked off. It happened after newest update, which was KDE-related.

[doktor5000]

Well, you didn't report here previously, and as far as I'm aware there was only one KDE update for mga5 recently: https://advisories.mageia.org/MGAA-2017-0066.html
Also, what is your issue about MCC not seeing the nobody user, where's the actual problem with that? As this thread was initially about the nobody user showing up in KDM login dialog.

@amigo7/Plisgyn: Can either of you please as root run

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updatedb
locate kdmrc

[amigo7]

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[root@komp amigo]# updatedb
[root@komp amigo]# locate kdmrc
/usr/share/config/kdm/kdmrc
/usr/share/doc/HTML/en/kdm/kdmrc-ref.docbook
/var/lib/mageia/kde4-profiles/Default/share/config/kdm/kdmrc

[Plisgyn]

Ran the above code, still the same what info do you require?

[amigo7]

I made the following changes in kdm settings (using graphical interface).
On the "users" tab:
(1) I unchecked "reverse choice"
(2) I checked user "amigo"
Then clicked the apply button and noticed that it works!
The user nobody and the previously hidden user (amigotest) disappeared in the login screen.

Below I list a few lines of the config file:

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/var/lib/mageia/kde4-profiles/Default/share/config/kdm/kdmrc

before applying changes:

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HiddenUsers=nobody,root,amigotest
SelectedUsers=
ShowUsers=NotHidden


and after applying changes:

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HiddenUsers=nobody,root,amigotest
SelectedUsers=amigo
ShowUsers=Selected


Edit:
I made the above changes yesterday and everything was OK (after logging out, rebooting not tested), but today both nobody and amigotest users appeared again in the login screen. After reversing the changes and applying them again, the hidden users disappeared (both logout and reboot tested). However they appeared again after 1 hour. I noticed that

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ShowUsers=Selected


was changed somehow to

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ShowUsers=NotHidden


I changed to ShowUsers=Selected manually and ran msec. The msec changed Selected to NotHidden!
I also changed the settings using System Settings->Login Screen->users and ran msec again. The result was the same (Selected changed to NotHidden).

[amigo7]

I worked out the workaround:
Become root and in the file

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/var/lib/mageia/kde4-profiles/Default/share/config/kdm/kdmrc

find the line

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SelectedUsers=

and write your username after =.
Then at the beginning of the file

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/etc/security/msec/security.conf

insert the following line

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ALLOW_USER_LIST=no

Finally, run

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msec

[deodric]

Just to say thank you amigo7, your workaround for this problem worked for me.