harbian-audit/bin/hardening/7.7.3_ensure_firewall_set_protect_dos_attacks.sh

#!/bin/bash

#
# harbian audit 9 Hardening
#

#
# 7.7.3 Ensure the Firewall is set rules of protect DOS attacks (Scored)
# Include ipv4 and ipv6
# Add this feature:Authors : Samson wen, Samson <sccxboy@gmail.com>
#

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

HARDENING_LEVEL=2

IPS4=$(which iptables)
IPS6=$(which ip6tables)

# Quick note here : CIS recommends your iptables rules to be persistent. 
# Do as you want, but this script does not handle this

# This function will be called if the script status is on enabled / audit mode
audit () {
    if [ $(${IPS4} -S | grep -E "\-m.*limit" | grep -Ec "\-\-limit-burst") -eq 0 ]; then
		crit "Ip4tables is not set rules of protect DOS attacks!"
		if [ $(${IPS6} -S | grep -Ec "^-A|^-I") -eq 0 ]; then
			crit "Ip6tables is not set rule!"
			FNRET=1
		else
			ok "Ip6tables rules are set!"
			FNRET=0
		fi
	else
		ok "Ip4tables has set rules for protect DOS attacks!"
		FNRET=0
	fi
}

# This function will be called if the script status is on enabled mode
apply () {
    if [ $FNRET = 0 ]; then
        ok "Ip4tables/Ip6tables has set rules for protect DOS attacks!"
    else
        warn "Ip4tables/Ip6tables is not set rules of protect DOS attacks! need the administrator to manually add it."
    fi
}

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

# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
    . /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
    . $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