Public bug reported:
Ubuntu: 18.04.2 LTS
OpenSSH: 7.6p1
I am having a problem starting multiple sshd processes. The default
location of the sshd privilege separation directory is hard-coded to
/run/sshd (see man page). If I want to have 2 sshd services using
systemd, I need to write 2 service files, let's call them
sshd_wan.service ans sshd_lan.service. Both of these services need to
have their own "RuntimeDirectory=sshd_wan" and
"RuntimeDirectory=sshd_lan". If you do not have separate
RuntimeDirectory definitions for the 2 services, then when one service
is killed/faults/restarts/stops/etc. the systemd (or init) process
deletes the RuntimeDirectory and causes the other service to crash since
a RuntimeDirectory does not exist.
The problem is the hard-coding of the sshd Privilege Separation
Directory. We need to modify the OpenBSD/OpenSSH sshd code to provision
command line assignment of the privilege separation directory.
I have attempted to contact the OpenSSH team (i.e. OpenSSH.com) and they
say it is a Ubuntu problem. I reported this in Ubuntu bug #1831765 and
Ubuntu (e.g. Paride Legovini, June 6, 2019 @ 2:55AM PDT) rejected it
because I described the problem using the init.d example.
I know how to modify the sshd.c file in OpenSSH 7.6p1, the problem is
getting Ubuntu and OpenSSH to admit there is a problem and it needs to
be fixed.
The problem is still there regardless if you are using Upstart (i.e.
init.d) or systemd.
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1832110
Title:
Resource Sharing with multiple sshd services
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