Iptables Tutorial 1.2.2

ОглавлениеДобавить в закладки К обложке

# 4.1.3 Create content in userspecified chains

#

#

# 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 LOG \

--log-prefix "New not syn:"

$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -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 0/0 --dport 21 -j allowed

$IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 22 -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 113 -j allowed

#

# UDP ports

#

#$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 53 -j ACCEPT

#$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 123 -j ACCEPT

#$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 2074 -j ACCEPT

#$IPTABLES -A udp_packets -p UDP -s 0/0 --source-port 4000 -j ACCEPT

#

# In Microsoft Networks you will be swamped by broadcasts. These lines

# will prevent them from showing up in the logs.

#

#$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d $INET_BROADCAST \

#--destination-port 135:139 -j DROP

#

# If we get DHCP requests from the Outside of our network, our logs will

# be swamped as well. This rule will block them from getting logged.

#

#$IPTABLES -A udp_packets -p UDP -i $INET_IFACE -d 255.255.255.255 \

#--destination-port 67:68 -j DROP

#

# 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

#

# 4.1.4 INPUT chain

#

#

# Bad TCP packets we don't want.

#

$IPTABLES -A INPUT -p tcp -j bad_tcp_packets

#

# Rules for special networks not part of the Internet

#

$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

#

# Rules for incoming packets from anywhere.

#

$IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED \

-j ACCEPT

$IPTABLES -A INPUT -p TCP -j tcp_packets

$IPTABLES -A INPUT -p UDP -j udp_packets

$IPTABLES -A INPUT -p ICMP -j icmp_packets

#

# If you have a Microsoft Network on the outside of your firewall, you may

# also get flooded by Multicasts. We drop them so we do not get flooded by

# logs

#

#$IPTABLES -A INPUT -i $INET_IFACE -d 224.0.0.0/8 -j DROP

#

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

#

$IPTABLES -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG \

--log-level DEBUG --log-prefix "IPT INPUT packet died: "

#

# 4.1.5 FORWARD chain

#

#

# Bad TCP packets we don't want

#

$IPTABLES -A FORWARD -p tcp -j bad_tcp_packets

#

# Accept the packets we actually want to forward

#

$IPTABLES -A FORWARD -p tcp --dport 21 -i $LAN_IFACE -j ACCEPT

$IPTABLES -A FORWARD -p tcp --dport 80 -i $LAN_IFACE -j ACCEPT

$IPTABLES -A FORWARD -p tcp --dport 110 -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.


-= 295 =-
Регистрация.
Забыли пароль?
Логин
Пароль
Запомнить меня