124 lines
3.5 KiB
Bash
Executable File
124 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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#
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# harbian-audit for Debian GNU/Linux 9/10/11/12 Hardening
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#
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#
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# 7.7.3 Ensure the Firewall is set rules of protect DOS attacks (Scored)
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# Include ipv4 and ipv6
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# Add this feature:Author : Samson wen, Samson <sccxboy@gmail.com>
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#
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#set -e # One error, it's over
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set -u # One variable unset, it's over
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HARDENING_LEVEL=2
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IPS4=$(which iptables)
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IPS6=$(which ip6tables)
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PACKAGE_NFT='nftables'
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IPV4_RET=1
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IPV6_RET=1
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IPV6_ISENABLE=1
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# Quick note here : CIS recommends your iptables rules to be persistent.
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# Do as you want, but this script does not handle this
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# This function will be called if the script status is on enabled / audit mode
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audit () {
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is_pkg_installed $PACKAGE_NFT
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if [ $FNRET != 0 ]; then
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# ipv4
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if [ $(${IPS4} -S | grep -E "\-m.*limit" | grep -Ec "\-\-limit-burst") -eq 0 ]; then
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info "Iptables is not set rules of protect DOS attacks!"
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IPV4_RET=1
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else
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info "Iptables has set rules for protect DOS attacks!"
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IPV4_RET=0
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fi
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# ipv6
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check_ipv6_is_enable
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IPV6_ISENABLE=$FNRET
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if [ $IPV6_ISENABLE = 0 ]; then
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if [ $(${IPS6} -S | grep -E "\-m.*limit" | grep -Ec "\-\-limit-burst") -eq 0 ]; then
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info "Ip6tables is not set rules of protect DOS attacks!"
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IPV6_RET=1
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else
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info "Ip6tables has set rules for protect DOS attacks!"
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IPV6_RET=0
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fi
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fi
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if [ $IPV6_ISENABLE -eq 0 ]; then
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if [ $IPV4_RET -eq 1 -o $IPV6_RET -eq 1 ]; then
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crit "Iptables/ip6tables is not set rules of protect DOS attacks!"
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FNRET=1
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else
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ok "Iptables/ip6tables has set rules for protect DOS attacks!"
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FNRET=0
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fi
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else
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if [ $IPV4_RET -eq 1 ]; then
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crit "Iptables is not set rules of protect DOS attacks!"
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FNRET=1
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else
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ok "Iptables has set rules for protect DOS attacks!"
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FNRET=0
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fi
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fi
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else
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if [ $(nft list ruleset 2>/dev/null | grep -v '^$' | grep -c 'limit.*burst') -gt 0 ]; then
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FNRET=10
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ok "nftables has set rules for protect DOS attacks!"
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else
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FNRET=11
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crit "nftables is not set rules for protect DOS attacks!"
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fi
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fi
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}
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# This function will be called if the script status is on enabled mode
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apply () {
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if [ $FNRET = 10 ]; then
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ok "nftables has set rules for protect DOS attacks!"
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elif [ $FNRET = 11 ]; then
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crit "nftables is not set rules for protect DOS attacks!"
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elif [ $FNRET = 0 ]; then
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if [ $IPV6_ISENABLE -eq 0 ]; then
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ok "Iptables/Ip6tables has set rules for protect DOS attacks!"
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else
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ok "Iptables has set rules for protect DOS attacks!"
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fi
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else
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if [ $IPV6_ISENABLE -eq 0 ]; then
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warn "Iptables/Ip6tables is not set rules of protect DOS attacks! need the administrator to manually add it."
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else
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warn "Iptables is not set rules of protect DOS attacks! need the administrator to manually add it."
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fi
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fi
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}
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# This function will check config parameters required
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check_config() {
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:
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}
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# Source Root Dir Parameter
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if [ -r /etc/default/cis-hardening ]; then
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. /etc/default/cis-hardening
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fi
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if [ -z "$CIS_ROOT_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
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echo "Cannot source CIS_ROOT_DIR variable, aborting."
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exit 128
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fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
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if [ -r $CIS_ROOT_DIR/lib/main.sh ]; then
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. $CIS_ROOT_DIR/lib/main.sh
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else
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echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
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exit 128
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fi
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