Verify Group Who Owns /var/log/waagent.log File

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Description

To properly set the group owner of /var/log/waagent.log, run the command:

$ sudo chgrp adm /var/log/waagent.log

or

$ sudo chgrp root /var/log/waagent.log

Rationale

The /var/log/waagent.log file contains Azure Linux Guest Agent records events that can be used for troubleshooting 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

newgroup=""
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 "${newgroup}" ]]; then
  >&2 echo "adm and root is not a defined group on the system"
else
find -P /var/log/ -maxdepth 1 -type f  ! -group adm ! -group root -regextype posix-extended -regex '.*waagent.log.*' -exec chgrp --no-dereference "$newgroup" {} \;

fi

Ansible playbook

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

- name: Check that the adm group is defined
  ansible.builtin.getent:
    database: group
    key: adm
  ignore_errors: true
  when: file_groupowner_var_log_waagent_newgroup is undefined
  tags:
  - configure_strategy
  - file_groupowner_var_log_waagent
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

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

- name: Check that the root group is defined
  ansible.builtin.getent:
    database: group
    key: root
  ignore_errors: true
  when: file_groupowner_var_log_waagent_newgroup is undefined
  tags:
  - configure_strategy
  - file_groupowner_var_log_waagent
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

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

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

- name: Ensure group owner on /var/log/ file(s) matching .*waagent.log.*
  ansible.builtin.file:
    path: '{{ item }}'
    follow: false
    group: '{{ file_groupowner_var_log_waagent_newgroup }}'
    state: file
  with_items:
  - '{{ files_found.stdout_lines }}'
  tags:
  - configure_strategy
  - file_groupowner_var_log_waagent
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed