Make the auditd Configuration Immutable
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Description
If the auditd
daemon is configured to use the
augenrules
program to read audit rules during daemon startup (the
default), add the following line to a file with suffix .rules
in the
directory /etc/audit/rules.d
in order to make the auditd configuration
immutable:
If the auditd
daemon is configured to use the auditctl
utility to read audit rules during daemon startup, add the following line to
/etc/audit/audit.rules
file in order to make the auditd configuration
immutable:
With this setting, a reboot will be required to change any audit rules.
Rationale
Making the audit configuration immutable prevents accidental as
well as malicious modification of the audit rules, although it may be
problematic if legitimate changes are needed during system
operation.
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Gather the package facts
package_facts:
manager: auto
tags:
- CJIS-5.4.1.1
- NIST-800-171-3.3.1
- NIST-800-171-3.4.3
- NIST-800-53-AC-6(9)
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-10.5.2
- PCI-DSSv4-10.3.2
- audit_rules_immutable
- low_complexity
- low_disruption
- medium_severity
- reboot_required
- restrict_strategy
- name: Collect all files from /etc/audit/rules.d with .rules extension
find:
paths: /etc/audit/rules.d/
patterns: '*.rules'
register: find_rules_d
when:
- '"audit" in ansible_facts.packages'
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- CJIS-5.4.1.1
- NIST-800-171-3.3.1
- NIST-800-171-3.4.3
- NIST-800-53-AC-6(9)
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-10.5.2
- PCI-DSSv4-10.3.2
- audit_rules_immutable
- low_complexity
- low_disruption
- medium_severity
- reboot_required
- restrict_strategy
- name: Remove the -e option from all Audit config files
lineinfile:
path: '{{ item }}'
regexp: ^\s*(?:-e)\s+.*$
state: absent
loop: '{{ find_rules_d.files | map(attribute=''path'') | list + [''/etc/audit/audit.rules'']
}}'
when:
- '"audit" in ansible_facts.packages'
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- CJIS-5.4.1.1
- NIST-800-171-3.3.1
- NIST-800-171-3.4.3
- NIST-800-53-AC-6(9)
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-10.5.2
- PCI-DSSv4-10.3.2
- audit_rules_immutable
- low_complexity
- low_disruption
- medium_severity
- reboot_required
- restrict_strategy
- name: Add Audit -e option into /etc/audit/rules.d/immutable.rules and /etc/audit/audit.rules
lineinfile:
path: '{{ item }}'
create: true
line: -e 2
mode: o-rwx
loop:
- /etc/audit/audit.rules
- /etc/audit/rules.d/immutable.rules
when:
- '"audit" in ansible_facts.packages'
- ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- CJIS-5.4.1.1
- NIST-800-171-3.3.1
- NIST-800-171-3.4.3
- NIST-800-53-AC-6(9)
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-10.5.2
- PCI-DSSv4-10.3.2
- audit_rules_immutable
- low_complexity
- low_disruption
- medium_severity
- reboot_required
- restrict_strategy