Set existing passwords a period of inactivity before they been locked

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Description

Configure user accounts that have been inactive for over a given period of time to be automatically disabled by running the following command:

$ sudo chage --inactive 30USER

Rationale

Inactive accounts pose a threat to system security since the users are not logging in to notice failed login attempts or other anomalies.

Remediation

Shell script

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

#!/bin/bash

var_account_disable_post_pw_expiration='30'


while IFS= read -r i; do
    chage --inactive $var_account_disable_post_pw_expiration $i
done <   <(awk -v var="$var_account_disable_post_pw_expiration" -F: '(($7 > var || $7 == "") && $2 ~ /^\$/) {print $1}' /etc/shadow)

Ansible playbook

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

- name: XCCDF Value var_account_disable_post_pw_expiration # promote to variable
  set_fact:
    var_account_disable_post_pw_expiration: !!str 30
  tags:
    - always

- name: Collect users with not correct INACTIVE parameter set
  ansible.builtin.command:
    cmd: awk -F':' '(($7 > {{ var_account_disable_post_pw_expiration }} || $7 == "")
      && $2 ~ /^\$/) {print $1}' /etc/shadow
  register: user_names
  changed_when: false
  tags:
  - CCE-86757-2
  - NIST-800-171-3.5.6
  - NIST-800-53-AC-2(3)
  - NIST-800-53-CM-6(a)
  - NIST-800-53-IA-4(e)
  - PCI-DSS-Req-8.1.4
  - PCI-DSSv4-8.2.6
  - accounts_set_post_pw_existing
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Change the period of inactivity
  ansible.builtin.command:
    cmd: chage --inactive {{ var_account_disable_post_pw_expiration }} {{ item }}
  with_items: '{{ user_names.stdout_lines }}'
  when: user_names.stdout_lines | length > 0
  tags:
  - CCE-86757-2
  - NIST-800-171-3.5.6
  - NIST-800-53-AC-2(3)
  - NIST-800-53-CM-6(a)
  - NIST-800-53-IA-4(e)
  - PCI-DSS-Req-8.1.4
  - PCI-DSSv4-8.2.6
  - accounts_set_post_pw_existing
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy