Configure auditd space_left on Low Disk Space

An XCCDF Rule

Description

The auditd service can be configured to take an action when disk space is running low but prior to running out of space completely. Edit the file /etc/audit/auditd.conf. Add or modify the following line, substituting PERCENTAGE appropriately:

space_left = PERCENTAGE%

Set this value to at least 25 to cause the system to notify the user of an issue.

Rationale

Notifying administrators of an impending disk space problem may allow them to take corrective action prior to any disruption.

ID: xccdf_org.ssgproject.content_rule_auditd_data_retention_space_left_percentage
Severity: Medium
References: 1 11 12 13 14 15 16 19 2 3 4 5 6 7 8

APO11.04 APO12.06 APO13.01 BAI03.05 BAI04.04 BAI08.02 DSS02.02 DSS02.04 DSS02.07 DSS03.01 DSS05.04 DSS05.07 MEA02.01

CCI-001855

4.2.3.10 4.3.3.3.9 4.3.3.5.8 4.3.4.4.7 4.3.4.5.6 4.3.4.5.7 4.3.4.5.8 4.4.2.1 4.4.2.2 4.4.2.4

SR 2.10 SR 2.11 SR 2.12 SR 2.8 SR 2.9 SR 6.1 SR 7.1 SR 7.2

A.12.1.3 A.12.4.1 A.12.4.2 A.12.4.3 A.12.4.4 A.12.7.1 A.16.1.4 A.16.1.5 A.16.1.7 A.17.2.1

AU-5(1) AU-5(2) AU-5(4) AU-5(b) CM-6(a)

DE.AE-3 DE.AE-5 PR.DS-4 PR.PT-1 RS.AN-1 RS.AN-4

Req-10.7

SRG-OS-000343-GPOS-00134
Updated: about 1 year ago

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - NIST-800-53-AU-5(1)
  - NIST-800-53-AU-5(2)  - NIST-800-53-AU-5(4)
  - NIST-800-53-AU-5(b)
  - NIST-800-53-CM-6(a)
  - PCI-DSS-Req-10.7
  - auditd_data_retention_space_left_percentage
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
- name: XCCDF Value var_auditd_space_left_percentage # promote to variable
  set_fact:
    var_auditd_space_left_percentage: !!str <xccdf-1.2:sub xmlns:xccdf-1.2="http://checklists.nist.gov/xccdf/1.2" idref="xccdf_org.ssgproject.content_value_var_auditd_space_left_percentage" use="legacy"/>
  tags:
    - always

- name: Configure auditd space_left on Low Disk Space
  lineinfile:
    dest: /etc/audit/auditd.conf
    line: space_left = {{ var_auditd_space_left_percentage }}%
    regexp: ^\s*space_left\s*=\s*.*$
    state: present
    create: true
  when:
  - '"audit" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - NIST-800-53-AU-5(1)
  - NIST-800-53-AU-5(2)
  - NIST-800-53-AU-5(4)
  - NIST-800-53-AU-5(b)
  - NIST-800-53-CM-6(a)
  - PCI-DSS-Req-10.7
  - auditd_data_retention_space_left_percentage
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] && rpm --quiet -q audit; then

var_auditd_space_left_percentage='<xccdf-1.2:sub xmlns:xccdf-1.2="http://checklists.nist.gov/xccdf/1.2" idref="xccdf_org.ssgproject.content_value_var_auditd_space_left_percentage" use="legacy"/>'

grep -q "^space_left[[:space:]]*=.*$" /etc/audit/auditd.conf && \
  sed -i "s/^space_left[[:space:]]*=.*$/space_left = $var_auditd_space_left_percentage%/g" /etc/audit/auditd.conf || \
  echo "space_left = $var_auditd_space_left_percentage%" >> /etc/audit/auditd.conf

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Configure auditd space_left on Low Disk Space

Description

Rationale

Remediation - Ansible

Remediation - Shell Script