Verify Group Who Owns /var/log/cloud-init.log* File

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Description

To properly set the group owner of /var/log/cloud-init.log*, run the command:

$ sudo chgrp adm /var/log/cloud-init.log*

or

$ sudo chgrp root /var/log/cloud-init.log*

Rationale

The /var/log/cloud-init.log* file contains detailed debugging information that helps users troubleshoot cloud-init and should only be accessed by authorized personnel.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

if getent group "adm" >/dev/null 2>&1; then
  newgroup="adm"
elif getent group "root" >/dev/null 2>&1; then
  newgroup="root"
fi
if [[ -z ${newgroup} ]]; then
  echo "adm and root is not a defined group on the system"
  exit 1
fi

find -L /var/log/ -maxdepth 1 -type f  ! -group adm ! -group root -regextype posix-extended -regex '.*cloud-init\.log.*' -exec chgrp -L $newgroup {} \;

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Check that the adm group is defined
  getent:
    database: group
    key: adm
  ignore_errors: true
  when: file_groupowner_var_log_cloud_init_newgroup is undefined
  tags:
  - configure_strategy
  - file_groupowner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set the file_groupowner_var_log_cloud_init_newgroup variable if adm found
  set_fact:
    file_groupowner_var_log_cloud_init_newgroup: adm
  when: ansible_facts.getent_group["adm"] is defined
  tags:
  - configure_strategy
  - file_groupowner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Check that the root group is defined
  getent:
    database: group
    key: root
  ignore_errors: true
  when: file_groupowner_var_log_cloud_init_newgroup is undefined
  tags:
  - configure_strategy
  - file_groupowner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set the file_groupowner_var_log_cloud_init_newgroup variable if root found
  set_fact:
    file_groupowner_var_log_cloud_init_newgroup: root
  when: ansible_facts.getent_group["root"] is defined
  tags:
  - configure_strategy
  - file_groupowner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Find /var/log/ file(s) matching .*cloud-init\.log.*
  command: find -L /var/log/ -maxdepth 1 -type f  ! -group adm ! -group root -regextype
    posix-extended -regex ".*cloud-init\.log.*"
  register: files_found
  changed_when: false
  failed_when: false
  check_mode: false
  tags:
  - configure_strategy
  - file_groupowner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure group owner on /var/log/ file(s) matching .*cloud-init\.log.*
  file:
    path: '{{ item }}'
    group: '{{ file_groupowner_var_log_cloud_init_newgroup }}'
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  tags:
  - configure_strategy
  - file_groupowner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed