[Bug 1832110] Re: Resource Sharing with multiple sshd services

[Robie Basak]

You're going round in circles.

Let's take a step back. Please assume that Ubuntu does not want to make
any change right now because no change is currently considered
justified.

An open question here is if Ubuntu's patches on upstream are creating
any problem that you're reporting. That's why I'm asking.

If they are, then please explain how and why.

If they are not, then I see no reason to make any change.

There's no point discussing this any further unless you can demonstrate
how Ubuntu is introducing any kind of problem that is unique to the
packaging and not upstream.

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https://bugs.launchpad.net/bugs/1832110

Title:
  Resource Sharing with multiple sshd services

Status in openssh package in Ubuntu:
  Won't Fix

Bug description:
  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.

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