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网络环境:学校通过教育城域网中心接入互联网
iptables脚本如下:
#!/bin/sh
INET_IFACE1="eth0"
LAN_IFACE1="eth1"
LO_IFACE="lo"
LO_IP="127.0.0.1"
IPTABLES="/sbin/iptables"
#
# Needed to initially load modules
#
/sbin/depmod -a
/sbin/modprobe ipt_multiport
/sbin/modprobe ip_tables
/sbin/modprobe iptable_filter
/sbin/modprobe iptable_mangle
/sbin/modprobe iptable_nat
/sbin/modprobe ipt_LOG
/sbin/modprobe ipt_limit
/sbin/modprobe ipt_state
/sbin/iptables -F
/sbin/iptables -X
/sbin/iptables -Z
/sbin/iptables -F -t nat
/sbin/iptables -F -t mangle
echo "1" > /proc/sys/net/ipv4/ip_forward
echo "1" > /proc/sys/net/ipv4/tcp_syncookies
echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -P FORWARD DROP
$IPTABLES -N bad_tcp_packets
$IPTABLES -N allowed
$IPTABLES -N tcp_packets
$IPTABLES -N udp_packets
$IPTABLES -N icmp_packets
#
# bad_tcp_packets chain
#
$IPTABLES -A bad_tcp_packets -p tcp --tcp-flags SYN,ACK SYN,ACK \
-m state --state NEW -j REJECT --reject-with tcp-reset
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j DROP
$IPTABLES -A bad_tcp_packets -p tcp -m multiport --dport 135,137,138,139 -j DROP
$IPTABLES -A bad_tcp_packets -p tcp -m multiport --dport 445,1022,1023,1433,1434 -j DROP
$IPTABLES -A bad_tcp_packets -p tcp -m multiport --dport 2500,2745,3128,3332,4444,5000 -j DROP
$IPTABLES -A bad_tcp_packets -p tcp -m multiport --dport 5238,5300,5554,6346,6667,9393 -j DROP
# allowed chain
$IPTABLES -A allowed -p TCP --syn -j ACCEPT
$IPTABLES -A allowed -p TCP -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A allowed -p TCP -j DROP
#
# TCP rules
#
$IPTABLES -A tcp_packets -p TCP -s 10.122.0.0/255.255.255.0 --dport 22 -j ACCEPT
$IPTABLES -A tcp_packets -p TCP -s 10.112.20.0/255.255.255.0 --dport 22 -j ACCEPT
#
# UDP ports
#
$IPTABLES -A udp_packets -p UDP --destination-port 135:139 -j DROP
$IPTABLES -A udp_packets -p UDP --destination-port 445 -j DROP
$IPTABLES -A udp_packets -p UDP --destination-port 69 -j DROP
$IPTABLES -A udp_packets -p UDP --destination-port 593 -j DROP
$IPTABLES -A udp_packets -p UDP --destination-port 1343 -j DROP
$IPTABLES -A udp_packets -p UDP --destination-port 4444 -j DROP
$IPTABLES -A udp_packets -p UDP --destination-port 1029 -j DROP
$IPTABLES -A udp_packets -p UDP --destination-port 1068 -j DROP
#
# ICMP rules
#
$IPTABLES -A icmp_packets -p ICMP --icmp-type 8 -j ACCEPT
$IPTABLES -A icmp_packets -p ICMP --icmp-type 0 -j ACCEPT
#
# INPUT chain
#
#
# Bad TCP packets we don't want.
#
$IPTABLES -A INPUT -p tcp -j bad_tcp_packets
$IPTABLES -A INPUT -p udp -j udp_packets
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -j ACCEPT
#
# Rules for incoming packets from the internet.
#
$IPTABLES -A INPUT -p ICMP -j icmp_packets
$IPTABLES -A INPUT -p ALL -j tcp_packets
#$IPTABLES -A INPUT -p TCP -j allowed
#
# FORWARD chain
#
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -p udp -j udp_packets
$IPTABLES -A FORWARD -p tcp -j bad_tcp_packets
$IPTABLES -A FORWARD -p tcp -d 10.112.20.6 --dport 80 -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 20 -j ACCEPT
$IPTABLES -A FORWARD -p tcp --dport 21 -j ACCEPT
$IPTABLES -A FORWARD -p TCP -i $LAN_IFACE1 -j ACCEPT
$IPTABLES -A FORWARD -p udp -j ACCEPT
$IPTABLES -A FORWARD -p icmp -j icmp_packets
#
# OUTPUT chain
#
#
# Bad TCP packets we don't want.
#
$IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets
$IPTABLES -A OUTPUT -p udp -j udp_packets |
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发表于 2007-12-05 14:07
发表于 2007-12-06 10:06