Ensure Sufficient Audit Log Storage (STIGs - ubuntu2204)

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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 SIZE_in_MB appropriately:

space_left = SIZE_in_MB

Set this value to the appropriate size in Megabytes 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.

Remediation

Shell script

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

#!/bin/bash

# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ] && dpkg-query --show --showformat='${db:Status-Status}\n' 'auditd' 2>/dev/null | grep -q installed; then

var_auditd_space_left='100'


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

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