Re: FreeIPA Users cannot log in via GDM after upgrade to Fedora 32

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> Hello all,
> 
> I'm looking for some guidance for where to investigate next, I'm not sure
> exactly where the issue is. I suspect I'll eventually need to put in a bug
> report, but who to?
> 
> I upgraded a couple FreeIPA domain joined machines to Fedora 32 and after
> the upgrade IPA users cannot log in via GDM into Gnome. I can Kinit users
> fine, or log in via another TTY, but using GDM once you enter the password
> the screen goes grey for a few seconds then returns to the login prompt.
> 
> I then rebuilt and successfully joined a machine, but on login I can see
> the prompts once the password was entered for it creating the home dir etc,
> but again it just returned me to the select a user screen.
> 
> I set debug logging for GDM and the log is here:
> 
> https://paste.centos.org/view/7386a981
> 
> Any suggestions of where to look next? I tried looking up the errors that I
> could see, but I didn't see anything that fit quite what I was seeing.

I think you are stumbling upon systemd bug with unreasonably strict limitation of what characters could be part of a user or group name. This used to work fine for decades (literally, Samba/winbindd supports such names since around 1998, SSSD since 2009) but then systemd developers decided to tighten up what they consider user/group names without really taking attention to the real world practices.

This is tracked in https://github.com/systemd/systemd/issues/15149 and was fixed in systemd with https://github.com/systemd/systemd/commit/7a8867abfab10e5bbca10590ec2aa40c5b27d8fb. I don't think there is any upstream release yet.

Please open a bug against systemd in Fedora 32 and reference that issue.

P.S. I'm not subscribed to the users@ list.
-- 
/ Alexander Bokovoy
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