debian-cis/bin/hardening/99.4.0_enable_auditd_kernel.sh

#!/bin/bash

# run-shellcheck
#
# CIS Debian Hardening Bonus Check
#

#
# 99.4.0 Ensure CONFIG_AUDIT is enabled in your running kernel
#

set -e # One error, it's over
set -u # One variable unset, it's over

# shellcheck disable=2034
HARDENING_LEVEL=4
# shellcheck disable=2034
DESCRIPTION="Ensure CONFIG_AUDIT is enabled in your running kernel."

# Note : Not part of the CIS guide, but what's the point of configuring software not compatible with your kernel? :)

KERNEL_OPTION="CONFIG_AUDIT"

# This function will be called if the script status is on enabled / audit mode
audit() {
    is_kernel_option_enabled "$KERNEL_OPTION"
    if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
        ok "$KERNEL_OPTION is enabled"
    else
        crit "$KERNEL_OPTION is disabled, auditd will not work"
    fi
    :
}

# This function will be called if the script status is on enabled mode
apply() {
    is_kernel_option_enabled "$KERNEL_OPTION"
    if [ "$FNRET" = 0 ]; then # 0 means true in bash, so it IS activated
        ok "$KERNEL_OPTION is enabled"
    else
        warn "I cannot fix $KERNEL_OPTION disabled, to make auditd work, recompile your kernel please"
    fi
    :
}

# This function will check config parameters required
check_config() {
    :
}

# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
    # shellcheck source=../../debian/default
    . /etc/default/cis-hardening
fi
if [ -z "$CIS_ROOT_DIR" ]; then
    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
    echo "Cannot source CIS_ROOT_DIR variable, aborting."
    exit 128
fi

# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
    # shellcheck source=../../lib/main.sh
    . "$CIS_ROOT_DIR"/lib/main.sh
else
    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
    exit 128
fi