Squid加IpTables实现网关防火墙的方法

红薯 发布于 2009/05/07 11:23
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需求说明:此服务器用作网关、MAIL(开启web、smtp、pop3)、FTP、DHCP服务器,内部一台机器(192.168.0.254)对外提供dns服务,为了不让无意者轻易看出此服务器开启了ssh服务器,故把ssh端口改为2018.另把proxy的端口改为60080 eth0:218.28.20.253,外网口
eth1:192.168.0.1/24,内网口
[jackylau@proxyserver init.d]$cat /etc/squid/squid.conf(部份如下) http_port 192.168.0.1:60080 httpd_accel_port 80 httpd_accel_host virtual httpd_accel_with_proxy on httpd_accel_uses_host_header on acl allow_lan src 192.168.0.0/24 http_access allow allow_lan visible_hostname proxyserver [jackylau@proxyserver init.d]$ cat firewall #!/bin/sh # Author: jackylau ; # chkconfig: 2345 08 92 # description: firewall # Time on 2005.08.02 # killproc # Set ENV INET_IP="218.28.20.253" INET_IFACE="eth0" LAN_IP="192.168.0.1" LAN_IP_RANGE="192.168.0.0/24" LAN_BROADCAST_ADDRESS="192.168.0.255" LAN_IFACE="eth1" LO_IFACE="lo" LO_IP="127.0.0.1" IPTABLES="/sbin/iptables" start(){ echo -n $"Starting firewall:" /sbin/depmod -a /sbin/modprobe ip_tables /sbin/modprobe ip_conntrack /sbin/modprobe iptable_filter /sbin/modprobe iptable_mangle /sbin/modprobe iptable_nat /sbin/modprobe ipt_LOG /sbin/modprobe ipt_limit /sbin/modprobe ipt_state echo "1" >; /proc/sys/net/ipv4/ip_forward # Set policies $IPTABLES -P INPUT DROP $IPTABLES -P OUTPUT DROP $IPTABLES -P FORWARD DROP # Add bad_tcp_packets, allowed and icmp_packets $IPTABLES -N bad_tcp_packets $IPTABLES -N tcp_packets $IPTABLES -N udp_packets $IPTABLES -N allowed $IPTABLES -N icmp_packets # bad_tcp_packets $IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j LOG --log-level INFO --log-prefix "New not syn:" $IPTABLES -A bad_tcp_packets -p TCP ! --syn -m state --state NEW -j DROP # allowed $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 $IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_BROADCAST_ADDRESS -j ACCEPT # TCP rules $IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 20 -j allowed $IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 21 -j allowed $IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 25 -j allowed $IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 80 -j allowed $IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 110 -j allowed $IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 2018 -j allowed # UDP rules $IPTABLES -A udp_packets -p UDP -s 0/0 --destination-port 67 -j ACCEPT # ICMP rules $IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 8 -j ACCEPT $IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT # INPUT chain $IPTABLES -A INPUT -p tcp -j bad_tcp_packets $IPTABLES -A INPUT -p ALL -i $LAN_IFACE -s $LAN_IP_RANGE -j ACCEPT $IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LO_IP -j ACCEPT $IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LAN_IP -j ACCEPT $IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $INET_IP -j ACCEPT $IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED -j ACCEPT $IPTABLES -A INPUT -p TCP -i $INET_IFACE -j tcp_packets $IPTABLES -A INPUT -p UDP -i $INET_IFACE -j udp_packets $IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets $IPTABLES -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT INPUT packet died: " # FORWARD chain $IPTABLES -A FORWARD -p tcp -j bad_tcp_packets $IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT $IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT $IPTABLES -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT FORWARD packet died: " # OUTPUT chain $IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets $IPTABLES -A OUTPUT -p ALL -s $LO_IP -j ACCEPT $IPTABLES -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT $IPTABLES -A OUTPUT -p ALL -s $INET_IP -j ACCEPT $IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT OUTPUT packet died: " # SNAT table $IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP # DNAT table $IPTABLES -t nat -A PREROUTING -p ! icmp -d $INET_IP -dport 53 -j DNAT --to-destination 192.168.0.254:53 # REDIRECT $IPTABLES -t nat -A PREROUTING -i $LAN_IFACE -p tcp -s $LAN_IP_RANGE --dport 80 -j REDIRECT --to-ports 60080 touch /var/lock/subsys/firewall } stop(){ echo -n $"Stoping firewall:" echo "0">;/proc/sys/net/ipv4/ip_forward $IPTABLES -P INPUT ACCEPT $IPTABLES -P FORWARD ACCEPT $IPTABLES -P OUTPUT ACCEPT $IPTABLES -t nat -P PREROUTING ACCEPT $IPTABLES -t nat -P POSTROUTING ACCEPT $IPTABLES -t nat -P OUTPUT ACCEPT $IPTABLES -t mangle -P PREROUTING ACCEPT $IPTABLES -t mangle -P OUTPUT ACCEPT $IPTABLES -F $IPTABLES -t nat -F $IPTABLES -t mangle -F $IPTABLES -X $IPTABLES -t nat -X $IPTABLES -t mangle -X rm -f /var/lock/subsys/firewall } status(){ clear echo "-------------------------------------------------------------------" $IPTABLES -L echo "-------------------------------------------------------------------" $IPTABLES -t nat -L POSTROUTING echo "-------------------------------------------------------------------" $IPTABLES -t nat -L PREROUTING } case "$1" in start) start ;; stop) stop ;; restart) stop start ;; *) echo "$0 [start|stop|restart|status]" ;; esac cp firewall /etc/init.d/ chmod 700 /etc/init.d/firewall chkconfig --add firewall (T002)

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