Linux - статьи



              

I.2. Пример rc.DMZ.firewall - часть 4


# # HTTP server #

$IPTABLES -A FORWARD -p TCP -i $INET_IFACE
-o $DMZ_IFACE -d $DMZ_HTTP_IP \ --dport 80 -j allowed $IPTABLES -A FORWARD -p ICMP -i $INET_IFACE
-o $DMZ_IFACE -d $DMZ_HTTP_IP \ -j icmp_packets

# # DNS server #

$IPTABLES -A FORWARD -p TCP -i $INET_IFACE
-o $DMZ_IFACE -d $DMZ_DNS_IP \ --dport 53 -j allowed $IPTABLES -A FORWARD -p UDP -i $INET_IFACE
-o $DMZ_IFACE -d $DMZ_DNS_IP \ --dport 53 -j ACCEPT $IPTABLES -A FORWARD -p ICMP -i $INET_IFACE
-o $DMZ_IFACE -d $DMZ_DNS_IP \ -j icmp_packets

# # LAN section #

$IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT $IPTABLES -A FORWARD -m state --state
ESTABLISHED,RELATED -j ACCEPT

# # Log weird packets that don't match the above. #

$IPTABLES -A FORWARD -m limit --limit 3/minute
--limit-burst 3 -j LOG \ --log-level DEBUG --log-prefix "IPT FORWARD packet died: "

# # 4.1.6 OUTPUT chain #

# # Bad TCP packets we don't want. #

$IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets

# # Special OUTPUT rules to
decide which IP's to allow. #

$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

# # Log weird packets that don't
match the above. #

$IPTABLES -A OUTPUT -m limit --limit 3/minute
--limit-burst 3 -j LOG \ --log-level DEBUG --log-prefix
"IPT OUTPUT packet died: "

###### # 4.2 nat table #

# # 4.2.1 Set policies #

# # 4.2.2 Create user specified chains #

# # 4.2.3 Create content in user specified chains #

# # 4.2.4 PREROUTING chain #

$IPTABLES -t nat -A PREROUTING -p TCP -i
$INET_IFACE -d $HTTP_IP --dport 80 \ -j DNAT --to-destination $DMZ_HTTP_IP $IPTABLES -t nat -A PREROUTING -p TCP -i
$INET_IFACE -d $DNS_IP --dport 53 \ -j DNAT --to-destination $DMZ_DNS_IP $IPTABLES -t nat -A PREROUTING -p UDP -i
$INET_IFACE -d $DNS_IP --dport 53 \ -j DNAT --to-destination $DMZ_DNS_IP

# # 4.2.5 POSTROUTING chain #

# # Enable simple IP Forwarding and Network
Address Translation #

$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE
-j SNAT --to-source $INET_IP

# # 4.2.6 OUTPUT chain #

###### # 4.3 mangle table #

# # 4.3.1 Set policies #

# # 4.3.2 Create user specified chains #

# # 4.3.3 Create content in user specified chains #

# # 4.3.4 PREROUTING chain #

# # 4.3.5 INPUT chain #

# # 4.3.6 FORWARD chain #

# # 4.3.7 OUTPUT chain #

# # 4.3.8 POSTROUTING chain #






Содержание  Назад  Вперед