Problem storing credentials with pam_cifscreds on desktop systems

Problem storing credentials with pam_cifscreds on desktop systems

[Kim Henriksen]

I wish to store CIFS credentials during login on a desktop, but I've
hit a brick wall, and my google foo has failed me.

When I login via the desktop environment no CIFS credentials are
available, but it works fine using SSH.

I have tried with Ubuntu 20.04 and Fedora 34, but same result.

This is how my Fedora installation is configured:

pam_cifscreds.x86_64      6.11-3.fc34

I have added these lines to: /etc/pam.d/{gdm-password,login,sshd}

auth          optional      pam_cifscreds.so debug
session     optional      pam_keyinit.so force revoke
session     optional      pam_cifscreds.so host=<myserver> debug

From the journal log when logging in can see the credentials gets stored:

gdm-password][3362]: pam_cifscreds(gdm-password:session): credential
key for \\<myserver>\<myuser> added
sshd[2835]: pam_cifscreds(sshd:session): credential key for
\\<myserver>\<myuser added

But I can't see the CIFS credentials in my desktop session:

$ keyctl show
Session Keyring
 882498672 --alswrv   1000  1000  keyring: _ses
1026128626 --alswrv   1000 65534   \_ keyring: _uid.1000

But when I login using SSH they are there:

$ keyctl show
Session Keyring
 145928652 --alswrv   1000  1000  keyring: _ses
1026128626 --alswrv   1000 65534   \_ keyring: _uid.1000
 802829928 ----sw-v      0     0   \_ logon: cifs:a:<myserver>

I'm not totally sure, but I think the problem in general is related to
this: https://github.com/systemd/systemd/issues/1299

-- 
Mvh.
Kim Henriksen