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[windowsguy <2006052@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Host OS is Ubuntu 22.04 LTS.

Guest info:

- Ubuntu 22.04 LTS KVM guest: https://cloud-images.ubuntu.com/releases/22.04/release/ubuntu-22.04-server-cloudimg-amd64-disk-kvm.img (also tried with https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64-disk-kvm.img)
- cloud-init package: 22.4.2-0ubuntu0~22.04.1

I use this to configure password for the Ubuntu user:

users:
  - name: ubuntu
    gecos: Ubuntu User
    sudo: ALL=(ALL) NOPASSWD:ALL
    shell: /bin/bash
    groups: sudo
    lock_passwd: false
    # mkpasswd --method=SHA-512 --rounds=4096 -S "1234asdf"
    passwd: $6$rounds=4096$1234asdf$3Ym7weobJp/ORkJML66e54IyCEOGKM8C1zfQj4NRngDgJJGdEJn3O9rocWy0uVc84PbEvSnzji3a54X5FOb230


While provisioning is still running, I can log in as root (configured separately) and observe the hash in /etc/shadow is identical to this (as expected). Also 'ubuntu' can login.

After provisioning is complete and the VM reboots, I cannot login as
'ubuntu'.

I log in as root and find that now a '!' was prefixed to password hash
in /etc/shadow:

ubuntu:!$6$rounds=4096$1....

If I remove that '!', I can login as the ubuntu user.

I tried surrounding the password with single and double quotes, no
difference. Initially it's provisioned correctly, so it's something that
injects that '!' after that.

** Affects: cloud-init
     Importance: Undecided
         Status: New


** Tags: exclamation password

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https://bugs.launchpad.net/bugs/2006052

Title:
  cloud init prefixes password hash adds exclamation mark

Status in cloud-init:
  New

Bug description:
  Host OS is Ubuntu 22.04 LTS.

  Guest info:

  - Ubuntu 22.04 LTS KVM guest: https://cloud-images.ubuntu.com/releases/22.04/release/ubuntu-22.04-server-cloudimg-amd64-disk-kvm.img (also tried with https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64-disk-kvm.img)
  - cloud-init package: 22.4.2-0ubuntu0~22.04.1

  I use this to configure password for the Ubuntu user:

  users:
    - name: ubuntu
      gecos: Ubuntu User
      sudo: ALL=(ALL) NOPASSWD:ALL
      shell: /bin/bash
      groups: sudo
      lock_passwd: false
      # mkpasswd --method=SHA-512 --rounds=4096 -S "1234asdf"
      passwd: $6$rounds=4096$1234asdf$3Ym7weobJp/ORkJML66e54IyCEOGKM8C1zfQj4NRngDgJJGdEJn3O9rocWy0uVc84PbEvSnzji3a54X5FOb230

  
  While provisioning is still running, I can log in as root (configured separately) and observe the hash in /etc/shadow is identical to this (as expected). Also 'ubuntu' can login.

  After provisioning is complete and the VM reboots, I cannot login as
  'ubuntu'.

  I log in as root and find that now a '!' was prefixed to password hash
  in /etc/shadow:

  ubuntu:!$6$rounds=4096$1....

  If I remove that '!', I can login as the ubuntu user.

  I tried surrounding the password with single and double quotes, no
  difference. Initially it's provisioned correctly, so it's something
  that injects that '!' after that.

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