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[Launchpad Bug Tracker <1940233@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init - 21.3-1-g6803368d-0ubuntu1

---------------
cloud-init (21.3-1-g6803368d-0ubuntu1) impish; urgency=medium

  * New upstream snapshot.
    - testing: Fix ssh keys integration test (#992)
    - Release 21.3 (#993) (LP: #1940839)
    - Azure: During primary nic detection, check interface status continuously
      before rebinding again (#990) [aswinrajamannar]
    - Fix home permissions modified by ssh module (SC-338) (#984)
      (LP: #1940233)
    - Add integration test for sensitive jinja substitution (#986)
    - Ignore hotplug socket when collecting logs (#985) (LP: #1940235)
    - testing: Add missing mocks to test_vmware.py (#982)
    - add Zadara Edge Cloud Platform to the supported clouds list (#963)
      [sarahwzadara]
    - testing: skip upgrade tests on LXD VMs (#980)

 -- James Falcon <james.falcon@xxxxxxxxxxxxx>  Mon, 23 Aug 2021 16:53:23
-0500

** Changed in: cloud-init (Ubuntu Impish)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1940233

Title:
  cloud-init   in impish makes /home/ubuntu/.ssh root.root

Status in cloud-init:
  Fix Released
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Bionic:
  New
Status in cloud-init source package in Focal:
  New
Status in cloud-init source package in Hirsute:
  New
Status in cloud-init source package in Impish:
  Fix Released

Bug description:
  Hi,
  I got to this by my systems complaining to be unable to do ssh-keygen
  after deployment. Example:
  $ uvt-kvm ssh --insecure impish-kvm 'ssh-keygen -b 2048 -t rsa -f ~/.ssh/id_rsa -q -N '\'''\'''
  Saving key "/home/ubuntu/.ssh/id_rsa" failed: Permission denied

  I found that is due to permissions after guest spawning:
  /home/ubuntu/.ssh changed

  Old:
  drwx------ 2 ubuntu ubuntu 4096 Aug 17 08:20 .ssh/

  New:
  drwxr-xr-x 2 root   root   4096 Aug 17 08:17 .ssh/

  That beaks later things like ssh-keygen.

  uvt-kvm only does instruct cloud-init to place a key.
  This uses ssh_authorized_keys from
  https://cloudinit.readthedocs.io/en/latest/topics/modules.html?highlight=ssh_authorized_keys#authorized-keys

  Checked a few guests:
  I've seen this on
  - impish x86
  - impish s390x

  I've not seen this on
  - bionic
  - focal
  - impish

  You might say - wait a minute impish in both lists.
  But it is the date:

  Bad
  com.ubuntu.cloud.daily:server:21.10:amd64 20210815
  cloud-init     21.2-69-g65607405-0ubuntu1

  Good
  com.ubuntu.cloud.daily:server:21.10:amd64 20210706
  cloud-init     21.2-3-g899bfaa9-0ubuntu2

  And either this cloud-init version is broken or the underlying new impish image.
  I mounted the underlying cloud-image (without customization by cloud-init)
  and found that /home is empty (true for all those images).

  So to me that seems to be an issue in the new cloud-init that now is in
  those images.

  Steps to reproduce
  # if your host has no keys to push to the guest run ssh-keygen
  # sync the latest broken images
  $ uvt-simplestreams-libvirt --verbose sync --source http://cloud-images.ubuntu.com/daily arch=amd64 label=daily release=impish
  # spawn guest
  $ uvt-kvm create --password=ubuntu i release=impish arch=amd64 label=daily
  # wait for it and check the permissions
  $ uvt-kvm wait i
  $ uvt-kvm ssh i "ls -laF /home/ubuntu/"
  drwxr-xr-x 2 root   root   4096 Aug 17 08:17 .ssh/

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