If sshd is configured with UsePAM yes, then after installing
libpam-systemd to a remote system and rebooting, ssh sessions are
cleanly terminated, but after purging libpam-systemd and rebooting, ssh
session are not cleanly terminated.
If sshd is configured with UsePAM no, then installing/purging
libpam-systemd has no effect, and ssh session are not cleanly terminated.
*When sshd is configured with UsePAM yes, and libpam-systemd is
installed, **/usr/share/pam-configs/systemd refers to registering user
sessions in the systemd control group hierarchy**.**Could this explain
how ssh sessions are being shutdown cleanly when using PAM? Does the
ssh service, apart from PAM, similarly register sessions in the systemd
control group hierarchy? If the ssh service does not register sessions
with the systemd control group hierarchy, could that explain this issue?*
Steps to reproduce (noting that the install/purge AND the reboot must be
completed before the ssh session behavior changes):
Use ssh to connect to a remote system where ssh sessions are not cleanly
terminated on remote system reboot.
Configure sshd with UsePAM yes.
Install libpam-systemd.
Reboot.
Observe ssh session is not cleanly terminated.
Use ssh to connect to remote system.
Reboot.
Observe ssh session is cleanly terminated.
Use ssh to connect to remote system.
Remove libpam-systemd.
Reboot.
Observe ssh session is cleanly terminated.
Use ssh to connect to remote system.
Reboot.
Observe ssh session is not cleanly terminated.
--
Daniel Kauffman
Lead Developer
Rock Solid Solutions, LLC
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208.699.9699 mobile
