[Bug 2049860] Re: cloud-init cloud-config for ssh broken in jammy

[Steve Langasek]

Hello Thomas, or anyone else affected,

Accepted livecd-rootfs into jammy-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.765.38 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: livecd-rootfs (Ubuntu Jammy)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-jammy

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https://bugs.launchpad.net/bugs/2049860

Title:
  cloud-init cloud-config for ssh broken in jammy

Status in cloud-images:
  In Progress
Status in cloud-images focal series:
  New
Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Jammy:
  Fix Committed

Bug description:
  [impact]
  cloud-config overrides via cloud-init for ssh do no longer work. Eg.

  #cloud-config
  ssh_pwauth: True

  doesn't enable password authentication anymore.

  The reason is that https://git.launchpad.net/livecd-
  rootfs/commit/live-build/ubuntu-
  cpc/hooks.d/chroot/052-ssh_authentication.chroot?h=ubuntu/jammy&id=3b2eeb017153cbbfc8935f9447e00d196e34d983
  is a wrong backport using the wrong filename
  /etc/ssh/sshd_config.d/10-cloudimg-settings.conf . it needs to be
  /etc/ssh/sshd_config.d/60-cloudimg-settings.conf . See
  https://git.launchpad.net/livecd-rootfs/tree/live-build/ubuntu-
  cpc/hooks.d/chroot/052-ssh_authentication.chroot?h=ubuntu/master which
  is the correct change in the ubuntu/master branch.

  This bug needs only fixing in Jammy and Focal because the fix is
  correct in > Jammy. Jammy has this bug already in the -updates pocket
  but Focal only has the wrong fix in its git branch.

  [test plan]
  * build an image with the proposed fix
  * use a cloud-init cloud-config data to enable ssh password auth (which is disabled by default)
  * check after image boot with "sshd -T" if password authentication is enabled
  * make sure that the file written by cloud-init in /etc/ssh/sshd_config.d/ has a lower number than the file from the image (cloudimg-settings.conf)

  [ Where problems could occur ]
  The change does rename a single file to have correct ordering between the prebuilt cloud images and cloud-init. There are edge-cases where this could create problems but those are acceptable:

  - rebuilt images based on the Ubuntu image which try to delete
  10-cloudimg-settings.conf would no longer work

  But in general this is a bug fix for the changes introduced in
  LP:#1968873

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