268 lines
7.8 KiB
Bash
268 lines
7.8 KiB
Bash
#!/bin/bash
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### iptables.sh for ipv4
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SYSCTL="/sbin/sysctl -w"
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IPT="/sbin/iptables"
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IPTS="/sbin/iptables-save"
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IPTR="/sbin/iptables-restore"
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# Internet Interface
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INET_IFACE="pub"
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#INET_IFACE2="pub2"
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INET_ADMIN="1.2.3.4"
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INET_ORB="2.3.4.5"
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# Local Interface Information
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LOCAL_IFACE="dmz"
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LOCAL_IP="192.168.0.5"
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LOCAL_NET="192.168.0.0/24"
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LOCAL_BCAST="192.168.0.255"
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# Localhost Interface
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LO_IFACE="lo"
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LO_IP="127.0.0.1"
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# Save and Restore arguments handled here
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if [ "$1" = "save" ]
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then
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echo -n "Saving firewall to /etc/sysconfig/iptables ... "
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$IPTS > /etc/scripts/iptables
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echo "done"
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exit 0
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elif [ "$1" = "restore" ]
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then
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echo -n "Restoring firewall from /etc/sysconfig/iptables ... "
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$IPTR < /etc/scripts/iptables
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echo "done"
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exit 0
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fi
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echo "Loading kernel modules ..."
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/sbin/modprobe ip_tables
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/sbin/modprobe ip_conntrack
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# /sbin/modprobe iptable_filter
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# /sbin/modprobe iptable_mangle
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# /sbin/modprobe iptable_nat
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# /sbin/modprobe ipt_LOG
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# /sbin/modprobe ipt_limit
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# /sbin/modprobe ipt_MASQUERADE
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# /sbin/modprobe ipt_owner
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# /sbin/modprobe ipt_REJECT
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# /sbin/modprobe ipt_mark
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# /sbin/modprobe ipt_tcpmss
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# /sbin/modprobe multiport
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# /sbin/modprobe ipt_state
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# /sbin/modprobe ipt_unclean
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/sbin/modprobe ip_nat_ftp
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/sbin/modprobe ip_conntrack_ftp
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/sbin/modprobe ip_conntrack_irc
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if [ "$SYSCTL" = "" ]
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then
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echo "1" > /proc/sys/net/ipv4/ip_forward
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else
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$SYSCTL net.ipv4.ip_forward="1"
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fi
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if [ "$SYSCTL" = "" ]
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then
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echo "1" > /proc/sys/net/ipv4/tcp_syncookies
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else
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$SYSCTL net.ipv4.tcp_syncookies="1"
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fi
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if [ "$SYSCTL" = "" ]
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then
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echo "1" > /proc/sys/net/ipv4/conf/all/rp_filter
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else
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$SYSCTL net.ipv4.conf.all.rp_filter="1"
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fi
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if [ "$SYSCTL" = "" ]
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then
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echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
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else
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$SYSCTL net.ipv4.icmp_echo_ignore_broadcasts="1"
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fi
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if [ "$SYSCTL" = "" ]
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then
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echo "0" > /proc/sys/net/ipv4/conf/all/accept_source_route
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else
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$SYSCTL net.ipv4.conf.all.accept_source_route="0"
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fi
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if [ "$SYSCTL" = "" ]
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then
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echo "1" > /proc/sys/net/ipv4/conf/all/secure_redirects
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else
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$SYSCTL net.ipv4.conf.all.secure_redirects="1"
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fi
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#if [ "$SYSCTL" = "" ]
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#then
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# echo "1" > /proc/sys/net/ipv4/conf/all/log_martians
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#else
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# $SYSCTL net.ipv4.conf.all.log_martians="1"
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#fi
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###############################################################################
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echo "Flushing Tables ..."
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# Reset Default Policies
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$IPT -P INPUT ACCEPT
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$IPT -P FORWARD ACCEPT
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$IPT -P OUTPUT ACCEPT
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$IPT -t nat -P PREROUTING ACCEPT
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$IPT -t nat -P POSTROUTING ACCEPT
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$IPT -t nat -P OUTPUT ACCEPT
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$IPT -t mangle -P PREROUTING ACCEPT
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$IPT -t mangle -P OUTPUT ACCEPT
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$IPT -F
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$IPT -t nat -F
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$IPT -t mangle -F
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$IPT -X
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$IPT -t nat -X
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$IPT -t mangle -X
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if [ "$1" = "stop" ]
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then
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echo "Firewall completely flushed! Now running with no firewall."
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exit 0
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fi
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$IPT -P INPUT DROP
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$IPT -P OUTPUT DROP
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$IPT -P FORWARD DROP
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###############################################################################
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$IPT -N bad_packets
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$IPT -N bad_tcp_packets
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$IPT -N icmp_packets
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$IPT -N udp_inbound
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$IPT -N udp_outbound
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$IPT -N tcp_inbound
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$IPT -N tcp_outbound
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$IPT -A bad_packets -p ALL -i $INET_IFACE -s $LOCAL_NET -j LOG --log-prefix "fp=bad_packets:2 a=DROP "
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$IPT -A bad_packets -p ALL -i $INET_IFACE -s $LOCAL_NET -j DROP
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$IPT -A bad_packets -p ALL -m state --state INVALID -j LOG --log-prefix "fp=bad_packets:1 a=DROP "
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$IPT -A bad_packets -p ALL -m state --state INVALID -j DROP
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$IPT -A bad_packets -p tcp -j bad_tcp_packets
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$IPT -A bad_packets -p ALL -j RETURN
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$IPT -A bad_tcp_packets -p tcp -i $LOCAL_IFACE -j RETURN
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$IPT -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j LOG --log-prefix "fp=bad_tcp_packets:1 a=DROP "
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$IPT -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j DROP
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL NONE -j LOG --log-prefix "fp=bad_tcp_packets:2 a=DROP "
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL NONE -j DROP
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL ALL -j LOG --log-prefix "fp=bad_tcp_packets:3 a=DROP "
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL ALL -j DROP
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL FIN,URG,PSH -j LOG --log-prefix "fp=bad_tcp_packets:4 a=DROP "
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j LOG --log-prefix "fp=bad_tcp_packets:5 a=DROP "
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$IPT -A bad_tcp_packets -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP
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$IPT -A bad_tcp_packets -p tcp --tcp-flags SYN,RST SYN,RST -j LOG --log-prefix "fp=bad_tcp_packets:6 a=DROP "
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$IPT -A bad_tcp_packets -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
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$IPT -A bad_tcp_packets -p tcp --tcp-flags SYN,FIN SYN,FIN -j LOG --log-prefix "fp=bad_tcp_packets:7 a=DROP "
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$IPT -A bad_tcp_packets -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
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$IPT -A bad_tcp_packets -p tcp -j RETURN
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### ICMP
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#$IPT -A icmp_packets --fragment -p ICMP -j LOG \
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# --log-prefix "fp=icmp_packets:1 a=DROP "
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#$IPT -A icmp_packets --fragment -p ICMP -j DROP
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#$IPT -A icmp_packets -p ICMP -s 0/0 --icmp-type 8 -j DROP
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#$IPT -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT
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#$IPT -A icmp_packets -p ICMP -j RETURN
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$IPT -A icmp_packets -p ICMP -j ACCEPT
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$IPT -A udp_inbound -p UDP -s 0/0 --destination-port 137 -j DROP
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$IPT -A udp_inbound -p UDP -s 0/0 --destination-port 138 -j DROP
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$IPT -A udp_inbound -p UDP -s 0/0 --source-port 67 --destination-port 68 -j ACCEPT
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$IPT -A udp_inbound -p UDP -s 0/0 --destination-port 53 -j ACCEPT
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$IPT -A udp_inbound -p UDP -j RETURN
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$IPT -A tcp_inbound -p TCP -s $INET_ORB --destination-port 10000 -j ACCEPT
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$IPT -A tcp_inbound -p TCP -s $INET_ORB --destination-port 10001 -j ACCEPT
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$IPT -A tcp_inbound -p TCP -s $INET_ADMIN --destination-port 22 -j ACCEPT
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$IPT -A tcp_inbound -p TCP -j RETURN
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$IPT -A udp_outbound -p UDP -s 0/0 -j ACCEPT
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$IPT -A tcp_outbound -p TCP -s 0/0 -j ACCEPT
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###############################################################################
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echo "Process INPUT chain ..."
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$IPT -A INPUT -p ALL -i $LO_IFACE -j ACCEPT
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$IPT -A INPUT -p ALL -j bad_packets
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$IPT -A INPUT -p ALL -i $LOCAL_IFACE -s $LOCAL_NET -j ACCEPT
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$IPT -A INPUT -p ALL -i $LOCAL_IFACE -d $LOCAL_BCAST -j ACCEPT
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$IPT -A INPUT -p ALL -i $INET_IFACE -m state --state ESTABLISHED,RELATED \
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-j ACCEPT
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$IPT -A INPUT -p TCP -i $INET_IFACE -j tcp_inbound
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#$IPT -A INPUT -p TCP -i $INET_IFACE2 -j tcp_inbound
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$IPT -A INPUT -p UDP -i $INET_IFACE -j udp_inbound
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$IPT -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets
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$IPT -A INPUT -m pkttype --pkt-type broadcast -j DROP
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$IPT -A INPUT -j LOG --log-prefix "fp=INPUT:99 a=DROP "
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###############################################################################
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echo "Process FORWARD chain ..."
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$IPT -A FORWARD -p ALL -j bad_packets
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$IPT -A FORWARD -p tcp -i $LOCAL_IFACE -j tcp_outbound
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$IPT -A FORWARD -p udp -i $LOCAL_IFACE -j udp_outbound
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$IPT -A FORWARD -p ALL -i $LOCAL_IFACE -j ACCEPT
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$IPT -A FORWARD -i $INET_IFACE -m state --state ESTABLISHED,RELATED \
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-j ACCEPT
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$IPT -A FORWARD -j LOG --log-prefix "fp=FORWARD:99 a=DROP "
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###############################################################################
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echo "Process OUTPUT chain ..."
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#$IPT -A OUTPUT -m state -p icmp --state INVALID -j DROP
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$IPT -A OUTPUT -p ALL -s $LO_IP -j ACCEPT
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$IPT -A OUTPUT -p ALL -o $LO_IFACE -j ACCEPT
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$IPT -A OUTPUT -p ALL -s $LOCAL_IP -j ACCEPT
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$IPT -A OUTPUT -p ALL -o $LOCAL_IFACE -j ACCEPT
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$IPT -A OUTPUT -p ALL -o $INET_IFACE -j ACCEPT
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#$IPT -A OUTPUT -p ALL -o $INET_IFACE2 -j ACCEPT
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$IPT -A OUTPUT -j LOG --log-prefix "fp=OUTPUT:99 a=DROP "
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###############################################################################
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echo "Load rules for nat table ..."
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### MASQUERADE
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$IPT -t nat -A POSTROUTING -o $INET_IFACE -j MASQUERADE
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###
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###
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###
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echo "Loading additiona rules ..."
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### VPN
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#$IPT -I INPUT -i tun+ -j ACCEPT
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#$IPT -I OUTPUT -o tun+ -j ACCEPT
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