Verify Permissions on /var/log/auth.log File

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Description

To properly set the permissions of /var/log/auth.log, run the command:

$ sudo chmod 0640 /var/log/auth.log

Rationale

The /var/log/auth.log file contains records information about user login attempts and authentication processes 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

chmod u-xs,g-xws,o-xwrt /var/log/auth.log

Ansible playbook

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

- name: Test for existence /var/log/auth.log
  stat:
    path: /var/log/auth.log
  register: file_exists
  tags:
  - configure_strategy
  - file_permissions_var_log_auth
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure permission u-xs,g-xws,o-xwrt on /var/log/auth.log
  file:
    path: /var/log/auth.log
    mode: u-xs,g-xws,o-xwrt
  when: file_exists.stat is defined and file_exists.stat.exists
  tags:
  - configure_strategy
  - file_permissions_var_log_auth
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed