debian-cis/bin/hardening/3.5.1.1_enable_firewall.sh
GoldenKiwi 5370ec2ef6
feat: add nftables to firewall software allow list (#203)
* feat: add nftables to firewall software allow list

fixes #191

* fix: enhance 3.5.4.1.1_net_fw_default_policy_drop.sh iptables output check, disable associated test
2023-09-07 14:36:08 +02:00

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#!/bin/bash
# run-shellcheck
#
# CIS Debian Hardening
#
#
# 3.5.1.1 Ensure Firewall is active (Scored)
#
set -e # One error, it's over
set -u # One variable unset, it's over
# shellcheck disable=2034
HARDENING_LEVEL=2
# shellcheck disable=2034
DESCRIPTION="Ensure firewall is active (either nftables or iptables is installed, does not check for its configuration)."
# Note: CIS recommends your iptables rules to be persistent.
# Do as you want, but this script does not handle this
PACKAGES='iptables nftables'
# This function will be called if the script status is on enabled / audit mode
audit() {
FOUND=false
for PACKAGE in $PACKAGES; do
is_pkg_installed "$PACKAGE"
if [ "$FNRET" = 0 ]; then
ok "$PACKAGE provides firewalling feature"
FOUND=true
fi
done
if [ "$FOUND" = false ]; then
crit "None of the following firewall packages are installed: $PACKAGES"
fi
}
# This function will be called if the script status is on enabled mode
apply() {
for PACKAGE in $PACKAGES; do
is_pkg_installed "$PACKAGE"
if [ "$FNRET" = 0 ]; then
ok "$PACKAGE provides firewalling feature"
FOUND=true
fi
done
if [ "$FOUND" = false ]; then
crit "None of the following firewall packages are installed: $PACKAGES, installing them"
# FIXME : iptables is hardcoded, we will have to change this in the future
# This will install nftables and iptables
apt_install "iptables"
fi
}
# This function will check config parameters required
check_config() {
:
}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
# shellcheck source=../../debian/default
. /etc/default/cis-hardening
fi
if [ -z "$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