Блокирование https трафика в rc.firewall

#!/bin/sh # # rc.firewall - Initial SIMPLE IP Firewall script for Linux 2.4.x and iptables # # Copyright (C) 2001 Oskar Andreasson <bluefluxATkoffeinDOTnet> # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; version 2 of the License. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program or from the site that you downloaded it # from; if not, write to the Free Software Foundation, Inc., 59 Temple # Place, Suite 330, Boston, MA 02111-1307 USA #

########################################################################### # # 1. Configuration options. #

# # 1.1 Internet Configuration. #

INET_IP=«213.138.66.22» INET_IFACE=«eth1» INET_BROADCAST=«213.138.66.255» # # 1.1.1 DHCP #

# # 1.1.2 PPPoE #

# # 1.2 Local Area Network configuration. # # your LAN's IP range and localhost IP. /24 means to only use the first 24 # bits of the 32 bit IP address. the same as netmask 255.255.255.0 #

LAN_IP=«172.22.42.50» LAN_IP_RANGE=«172.22.42.0/25» LAN_IFACE=«eth0»

# # 1.3 DMZ Configuration. #

# # 1.4 Localhost Configuration. #

LO_IFACE=«lo» LO_IP=«127.0.0.1»

# # 1.5 IPTables Configuration. #

IPTABLES=«/sbin/iptables»

# # 1.6 Other Configuration. #

########################################################################### # # 2. Module loading. #

# # Needed to initially load modules #

/sbin/depmod -a

# # 2.1 Required modules #

/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

# # 2.2 Non-Required modules #

#/sbin/modprobe ipt_owner #/sbin/modprobe ipt_REJECT #/sbin/modprobe ipt_MASQUERADE #/sbin/modprobe ip_conntrack_ftp #/sbin/modprobe ip_conntrack_irc #/sbin/modprobe ip_nat_ftp #/sbin/modprobe ip_nat_irc

########################################################################### # # 3. /proc set up. #

# # 3.1 Required proc configuration #

#echo «1» > /proc/sys/net/ipv4/ip_forward

# # 3.2 Non-Required proc configuration #

#echo «1» > /proc/sys/net/ipv4/conf/all/rp_filter #echo «1» > /proc/sys/net/ipv4/conf/all/proxy_arp #echo «1» > /proc/sys/net/ipv4/ip_dynaddr

########################################################################### # # 4. rules set up. #

###### # 4.1 Filter table #

# # 4.1.1 Set policies #

$IPTABLES -P INPUT DROP $IPTABLES -P OUTPUT DROP $IPTABLES -P FORWARD DROP

# # 4.1.2 Create userspecified chains #

# # Create chain for bad tcp packets #

$IPTABLES -N bad_tcp_packets

# # Create separate chains for ICMP, TCP and UDP to traverse #

$IPTABLES -N allowed $IPTABLES -N tcp_packets $IPTABLES -N udp_packets $IPTABLES -N icmp_packets

# # 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 $IPTABLES -A tcp_packets -p TCP -d 172.22.42.0/25 --dport 443 -j allowed $IPTABLES -A tcp_packets -p TCP -s 0/0 --dport 5190 -j allowed

# # UDP ports #

#$IPTABLES -A udp_packets -p UDP -s 0/0 --destination-port 53 -j ACCEPT #$IPTABLES -A udp_packets -p UDP -s 0/0 --destination-port 123 -j ACCEPT $IPTABLES -A udp_packets -p UDP -s 0/0 --destination-port 2074 -j ACCEPT $IPTABLES -A udp_packets -p UDP -s 0/0 --destination-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 $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

# # Special rule for DHCP requests from LAN, which are not caught properly # otherwise. #

$IPTABLES -A INPUT -p UDP -i $LAN_IFACE --dport 67 --sport 68 -j ACCEPT

# # Rules for incoming packets from the internet. #

$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

# # 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 -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 #

# # 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 $IPTABLES -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128 # # 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 #