[Bug 2089198] [NEW] sshd-socket-generator incorrectly converts ListenAddress to ListenStream, sshd does not start due to "Address already in use"

[Jernej Jakob]

Public bug reported:

After upgrading from 22.04 to 24.04, ssh.socket failed to start.
I have overridden ListenAddress in /etc/ssh/sshd_config.d/listenaddress.conf, which contains:

ListenAddress 192.0.2.2
ListenAddress ::

This was converted into the following
/run/systemd/generator/ssh.socket.d/addresses.conf

# Automatically generated by sshd-socket-generator

[Socket]
ListenStream=
ListenStream=22
ListenStream=192.0.2.2:22

The two ListenStream definitions obviously conflict, causing the startup error.
Although my ListenAddress configuration doesn't do what I wanted it to either (listen on just one v4 address but all v6 addresses), it just listens on all addresses (*:22), sshd starts successfully with it.
As I don't need socket activation as RAM usage isn't an issue in my case, I disabled ssh.socket and reenabled ssh.service to make it work again.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: openssh-server 1:9.6p1-3ubuntu13.5
ProcVersionSignature:
 
Uname: Linux 6.8.12-4-pve x86_64
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Thu Nov 21 02:06:35 2024
ProcEnviron:
 PATH=(custom, no user)
 TERM=linux
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: openssh
UpgradeStatus: Upgraded to noble on 2024-11-21 (0 days ago)
modified.conffile..etc.init.d.apport: [modified]
mtime.conffile..etc.init.d.apport: 2024-07-22T16:59:07

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2089198

Title:
  sshd-socket-generator incorrectly converts ListenAddress to
  ListenStream, sshd does not start due to "Address already in use"

Status in openssh package in Ubuntu:
  New

Bug description:
  After upgrading from 22.04 to 24.04, ssh.socket failed to start.
  I have overridden ListenAddress in /etc/ssh/sshd_config.d/listenaddress.conf, which contains:

  ListenAddress 192.0.2.2
  ListenAddress ::

  This was converted into the following
  /run/systemd/generator/ssh.socket.d/addresses.conf

  # Automatically generated by sshd-socket-generator

  [Socket]
  ListenStream=
  ListenStream=22
  ListenStream=192.0.2.2:22

  The two ListenStream definitions obviously conflict, causing the startup error.
  Although my ListenAddress configuration doesn't do what I wanted it to either (listen on just one v4 address but all v6 addresses), it just listens on all addresses (*:22), sshd starts successfully with it.
  As I don't need socket activation as RAM usage isn't an issue in my case, I disabled ssh.socket and reenabled ssh.service to make it work again.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: openssh-server 1:9.6p1-3ubuntu13.5
  ProcVersionSignature:
   
  Uname: Linux 6.8.12-4-pve x86_64
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Thu Nov 21 02:06:35 2024
  ProcEnviron:
   PATH=(custom, no user)
   TERM=linux
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: openssh
  UpgradeStatus: Upgraded to noble on 2024-11-21 (0 days ago)
  modified.conffile..etc.init.d.apport: [modified]
  mtime.conffile..etc.init.d.apport: 2024-07-22T16:59:07

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