Verify User Who Owns /var/log/cloud-init.log File

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Description

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

$ sudo chown syslog /var/log/cloud-init.log

or

$ sudo chown 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

newown=""
if id "syslog" >/dev/null 2>&1; then
  newown="syslog"
elif id "root" >/dev/null 2>&1; then
  newown="root"
fi

if [[ -z "$newown" ]]; then
  >&2 echo "syslog and root is not a defined user on the system"
else

find -P /var/log/ -maxdepth 1 -type f  ! -user syslog ! -user root -regextype posix-extended -regex '.*cloud-init\.log.*' -exec chown --no-dereference "$newown" {} \;

fi

Ansible playbook

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

- name: Check that the syslog user is defined
  ansible.builtin.getent:
    database: passwd
    key: syslog
  ignore_errors: true
  tags:
  - configure_strategy
  - file_owner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set the file_owner_var_log_cloud_init_newown variable if syslog found
  ansible.builtin.set_fact:
    file_owner_var_log_cloud_init_newown: syslog
  when: ansible_facts.getent_passwd["syslog"] is defined
  tags:
  - configure_strategy
  - file_owner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Check that the root user is defined
  ansible.builtin.getent:
    database: passwd
    key: root
  ignore_errors: true
  when: file_owner_var_log_cloud_init_newown is undefined
  tags:
  - configure_strategy
  - file_owner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set the file_owner_var_log_cloud_init_newown variable if root found
  ansible.builtin.set_fact:
    file_owner_var_log_cloud_init_newown: root
  when: ansible_facts.getent_passwd["root"] is defined
  tags:
  - configure_strategy
  - file_owner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

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

- name: Ensure owner on /var/log/ file(s) matching .*cloud-init\.log.*
  ansible.builtin.file:
    path: '{{ item }}'
    follow: false
    owner: '{{ file_owner_var_log_cloud_init_newown }}'
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  tags:
  - configure_strategy
  - file_owner_var_log_cloud_init
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed