Set type of computer node name logging in audit logs

An XCCDF Rule

Description

To configure Audit daemon to use a unique identifier as computer node name in the audit events, set name_format to in /etc/audit/auditd.conf.

warning alert: Warning

Whenever the variable

var_auditd_name_format

uses a multiple value option, for example

A|B|C

, the first value will be used when remediating this rule.

Rationale

If option name_format is left at its default value of none, audit events from different computers may be hard to distinguish.

ID: xccdf_org.ssgproject.content_rule_auditd_name_format
Severity: Medium
References: CCI-001851

AU-3 CM-6

FAU_GEN.1.2

SRG-OS-000039-GPOS-00017 SRG-OS-000342-GPOS-00133 SRG-OS-000479-GPOS-00224

OL08-00-030062

SV-248730r877390_rule
Updated: 8 months ago

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - DISA-STIG-OL08-00-030062
  - NIST-800-53-AU-3  - NIST-800-53-CM-6
  - auditd_name_format
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
- name: XCCDF Value var_auditd_name_format # promote to variable
  set_fact:
    var_auditd_name_format: !!str <xccdf-1.2:sub xmlns:xccdf-1.2="http://checklists.nist.gov/xccdf/1.2" idref="xccdf_org.ssgproject.content_value_var_auditd_name_format" use="legacy"/>
  tags:
    - always

- name: Set type of computer node name logging in audit logs - Define Value to Be
    Used in the Remediation
  ansible.builtin.set_fact: auditd_name_format_split="{{ var_auditd_name_format.split('|')[0]
    }}"
  when:
  - '"audit" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - DISA-STIG-OL08-00-030062
  - NIST-800-53-AU-3
  - NIST-800-53-CM-6
  - auditd_name_format
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Set type of computer node name logging in audit logs
  block:

  - name: Check for duplicate values
    lineinfile:
      path: /etc/audit/auditd.conf
      create: true
      regexp: (?i)^\s*name_format\s*=\s*
      state: absent
    check_mode: true
    changed_when: false
    register: dupes

  - name: Deduplicate values from /etc/audit/auditd.conf
    lineinfile:
      path: /etc/audit/auditd.conf
      create: true
      regexp: (?i)^\s*name_format\s*=\s*
      state: absent
    when: dupes.found is defined and dupes.found > 1

  - name: Insert correct line to /etc/audit/auditd.conf
    lineinfile:
      path: /etc/audit/auditd.conf
      create: true
      regexp: (?i)^\s*name_format\s*=\s*
      line: name_format = {{ auditd_name_format_split }}
      state: present
  when:
  - '"audit" in ansible_facts.packages'
  - ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  tags:
  - DISA-STIG-OL08-00-030062
  - NIST-800-53-AU-3
  - NIST-800-53-CM-6
  - auditd_name_format
  - 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_name_format='<xccdf-1.2:sub xmlns:xccdf-1.2="http://checklists.nist.gov/xccdf/1.2" idref="xccdf_org.ssgproject.content_value_var_auditd_name_format" use="legacy"/>'

var_auditd_name_format="$(echo $var_auditd_name_format | cut -d \| -f 1)"

if [ -e "/etc/audit/auditd.conf" ] ; then
    
    LC_ALL=C sed -i "/^\s*name_format\s*=\s*/Id" "/etc/audit/auditd.conf"
else
    touch "/etc/audit/auditd.conf"
fi
# make sure file has newline at the end
sed -i -e '$a\' "/etc/audit/auditd.conf"

cp "/etc/audit/auditd.conf" "/etc/audit/auditd.conf.bak"
# Insert at the end of the file
printf '%s\n' "name_format = $var_auditd_name_format" >> "/etc/audit/auditd.conf"
# Clean up after ourselves.
rm "/etc/audit/auditd.conf.bak"

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

Set type of computer node name logging in audit logs

Description

Rationale

Remediation - Ansible

Remediation - Shell Script