[Bug 2077576] Re: SSH client doesn't handle properly non-ASCII chars

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~3v1n0/ubuntu/+source/openssh/+git/openssh/+merge/471761

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https://bugs.launchpad.net/bugs/2077576

Title:
  SSH client doesn't handle properly non-ASCII chars

Status in openssh package in Ubuntu:
  Fix Released
Status in openssh source package in Focal:
  In Progress
Status in openssh source package in Jammy:
  In Progress
Status in openssh source package in Noble:
  Fix Released

Bug description:
  [ Impact ]

  Non-ascii visible chars are not properly rendered by clients, showing
  their octal visualization.

  Such as:

  Hello SSHD! We love \360\237\215\225!

  [ Test case ]

  ## Server preparation

  Enable PAM and keyboard interactive authentication in a ssh server:

  Add a configuration file such as:
   /etc/ssh/sshd_config.d/test-ssh-pam.conf

  Containing:

  UsePAM yes
  KbdInteractiveAuthentication yes

  
  Restart the server:

    sudo systemctl restart ssh.service

  Edit the sshd PAM configuration file, adding as first line:

    auth    requisite pam_echo.so Hello SSHD! We love 🍕!

  Can be done with the command:
    sudo sed '1 i\auth    requisite pam_echo.so Hello SSHD! We love 🍕!' -i /etc/pam.d/sshd

  
  ## Client test

  In the same host:

   ssh -o PubkeyAuthentication=no \
       -o PasswordAuthentication=no \
       -o PreferredAuthentications=keyboard-interactive \
       $USER at localhost

  The client should show:

  Hello SSHD-dev in devel schroot! Want some 🍕?
  ($USER at localhost) Password:

  
  ## Cleanup

  Revert the changes done in the cleanup phase, after test is done

  sudo sed '/pam_echo\.so/d' -i /etc/pam.d/sshd
  sudo rm /etc/ssh/sshd_config.d/test-ssh-pam.conf

  [ Regression potential ]

  SSH info messages are not shown by the client

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