[Bug 2107356] [NEW] sshd -t check failed when sshd not running

[jinkangkang]

Public bug reported:

after stopped ssh service, the sshd -t will check failed, and a error
reported:  "Missing privilege separation directory: /run/sshd", but when
there is a invalid configrue in sshd_config, the check is working
properly

cat /etc/os-release 
PRETTY_NAME="Ubuntu 24.04.2 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.2 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo 


systemctl stop ssh

sshd -t
Missing privilege separation directory: /run/sshd

echo "invalid_test" >> /etc/ssh/sshd_config

sshd -t
/etc/ssh/sshd_config line 127: no argument after keyword "invalid_test"
/etc/ssh/sshd_config: terminating, 1 bad configuration options

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

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https://bugs.launchpad.net/bugs/2107356

Title:
  sshd -t check failed when sshd not running

Status in openssh package in Ubuntu:
  New

Bug description:
  after stopped ssh service, the sshd -t will check failed, and a error
  reported:  "Missing privilege separation directory: /run/sshd", but
  when there is a invalid configrue in sshd_config, the check is working
  properly

  cat /etc/os-release 
  PRETTY_NAME="Ubuntu 24.04.2 LTS"
  NAME="Ubuntu"
  VERSION_ID="24.04"
  VERSION="24.04.2 LTS (Noble Numbat)"
  VERSION_CODENAME=noble
  ID=ubuntu
  ID_LIKE=debian
  HOME_URL="https://www.ubuntu.com/"
  SUPPORT_URL="https://help.ubuntu.com/"
  BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
  PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
  UBUNTU_CODENAME=noble
  LOGO=ubuntu-logo 


  
  systemctl stop ssh 

  sshd -t
  Missing privilege separation directory: /run/sshd

  echo "invalid_test" >> /etc/ssh/sshd_config

  sshd -t
  /etc/ssh/sshd_config line 127: no argument after keyword "invalid_test"
  /etc/ssh/sshd_config: terminating, 1 bad configuration options

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