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| Thread | Thread Starter | Forum | Replies | Last Post |
| Arno's IPTABLES Firewall Script 1.9.0-beta3 (Default branch) | iBot | Software Releases - RSS News | 0 | 05-26-2008 10:20 AM |
| Arno's IPTABLES Firewall Script 1.8.8o (Stable branch) | iBot | Software Releases - RSS News | 0 | 03-04-2008 05:10 PM |
| Arno's IPTABLES Firewall Script 1.8.8n (Stable branch) | iBot | Software Releases - RSS News | 0 | 02-20-2008 03:10 PM |
| Arno's IPTABLES Firewall Script 1.8.8m (Stable branch) | iBot | Software Releases - RSS News | 0 | 02-17-2008 02:20 AM |
| Arno's IPTABLES Firewall Script 1.8.8l (Stable branch) | iBot | Software Releases - RSS News | 0 | 12-25-2007 03:20 AM |
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08-01-2002
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The Best Script For Iptables Firewall
UTIN Firewall script for Linux 2.4.x and iptables
============================================== #!/bin/sh # # rc.firewall - UTIN 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="194.236.50.155" INET_IFACE="eth0" # # 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 adress. the same as netmask 255.255.255.0 # LAN_IP="192.168.0.2" LAN_IP_RANGE="192.168.0.0/16" LAN_BCAST_ADRESS="192.168.255.255" LAN_IFACE="eth1" # # 1.3 DMZ Configuration. # # # 1.4 Localhost Configuration. # LO_IFACE="lo" LO_IP="127.0.0.1" # # 1.5 IPTables Configuration. # IPTABLES="/usr/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 ########################################################################### # # 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 icmp_packets $IPTABLES -N tcp_packets $IPTABLES -N udpincoming_packets # # 4.1.3 Create content in userspecified chains # # # bad_tcp_packets chain # $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 udpincoming_packets -p UDP -s 0/0 --source-port 53 -j ACCEPT #$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 123 -j ACCEPT $IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 2074 -j ACCEPT $IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 4000 -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 # # 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 udpincoming_packets $IPTABLES -A INPUT -p ICMP -j icmp_packets # # 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. # $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 # # 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 # |
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08-01-2002
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DMZ IP Firewall script for Linux 2.4.x and iptables
#!/bin/sh
# # rc.DMZ.firewall - DMZ 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="194.236.50.152" HTTP_IP="194.236.50.153" DNS_IP="194.236.50.154" INET_IFACE="eth0" # # 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 adress. the same as netmask 255.255.255.0 # LAN_IP="192.168.0.2" LAN_IP_RANGE="192.168.0.0/16" LAN_BCAST_ADRESS="192.168.255.255" LAN_IFACE="eth1" # # 1.3 DMZ Configuration. # DMZ_HTTP_IP="192.168.1.2" DMZ_DNS_IP="192.168.1.3" DMZ_IP="192.168.1.1" DMZ_IFACE="eth2" # # 1.4 Localhost Configuration. # LO_IFACE="lo" LO_IP="127.0.0.1" # # 1.5 IPTables Configuration. # IPTABLES="/usr/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 ########################################################################### # # 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 icmp_packets $IPTABLES -N tcp_packets $IPTABLES -N udpincoming_packets # # 4.1.3 Create content in userspecified chains # # # bad_tcp_packets chain # $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 # # ICMP rules # # Changed rules totally $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 # # Packets from the Internet to this box # $IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets # # Packets from LAN, DMZ or LOCALHOST # # # From DMZ Interface to DMZ firewall IP # $IPTABLES -A INPUT -p ALL -i $DMZ_IFACE -d $DMZ_IP -j ACCEPT # # From LAN Interface to LAN firewall IP # $IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_IP -j ACCEPT $IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_BCAST_ADRESS -j ACCEPT # # From Localhost interface to Localhost IP's # $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 # # All established and related packets incoming from the internet to the # firewall # $IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED \ -j ACCEPT # # 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 # # DMZ section # # General rules # $IPTABLES -A FORWARD -i $DMZ_IFACE -o $INET_IFACE -j ACCEPT $IPTABLES -A FORWARD -i $INET_IFACE -o $DMZ_IFACE -m state \ --state ESTABLISHED,RELATED -j ACCEPT $IPTABLES -A FORWARD -i $LAN_IFACE -o $DMZ_IFACE -j ACCEPT $IPTABLES -A FORWARD -i $DMZ_IFACE -o $LAN_IFACE -j ACCEPT # # 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 # |
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08-01-2002
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DHCP IP Firewall script for Linux 2.4.x and iptables
#!/bin/sh
# # rc.firewall - DHCP 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_IFACE="eth0" # # 1.1.1 DHCP # # # Information pertaining to DHCP over the Internet, if needed. # # Set DHCP variable to no if you don't get IP from DHCP. If you get DHCP # over the Internet set this variable to yes, and set up the proper IP # adress for the DHCP server in the DHCP_SERVER variable. # DHCP="no" DHCP_SERVER="195.22.90.65" # # 1.1.2 PPPoE # # Configuration options pertaining to PPPoE. # # If you have problem with your PPPoE connection, such as large mails not # getting through while small mail get through properly etc, you may set # this option to "yes" which may fix the problem. This option will set a # rule in the PREROUTING chain of the mangle table which will clamp # (resize) all routed packets to PMTU (Path Maximum Transmit Unit). # # Note that it is better to set this up in the PPPoE package itself, since # the PPPoE configuration option will give less overhead. # PPPOE_PMTU="no" # # 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 adress. the same as netmask 255.255.255.0 # LAN_IP="192.168.0.2" LAN_IP_RANGE="192.168.0.0/16" LAN_BCAST_ADRESS="192.168.255.255" LAN_IFACE="eth1" # # 1.3 DMZ Configuration. # # # 1.4 Localhost Configuration. # LO_IFACE="lo" LO_IP="127.0.0.1" # # 1.5 IPTables Configuration. # IPTABLES="/usr/sbin/iptables" # # 1.6 Other Configuration. # ########################################################################### # # 2. Module loading. # # # Needed to initially load modules # /sbin/depmod -a # # 2.1 Required modules # /sbin/modprobe ip_conntrack /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_MASQUERADE # # 2.2 Non-Required modules # #/sbin/modprobe ipt_owner #/sbin/modprobe ipt_REJECT #/sbin/modprobe ip_conntrack_ftp #/sbin/modprobe ip_conntrack_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 icmp_packets $IPTABLES -N tcp_packets $IPTABLES -N udpincoming_packets # # 4.1.3 Create content in userspecified chains # # # bad_tcp_packets chain # $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 udpincoming_packets -p UDP -s 0/0 --source-port 53 -j ACCEPT if [ $DHCP == "yes" ] ; then $IPTABLES -A udpincoming_packets -p UDP -s $DHCP_SERVER --sport 67 \ --dport 68 -j ACCEPT fi #$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 53 -j ACCEPT #$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 123 -j ACCEPT $IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 2074 -j ACCEPT $IPTABLES -A udpincoming_packets -p UDP -s 0/0 --source-port 4000 -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 # # 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 -j ACCEPT $IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_BCAST_ADRESS -j ACCEPT # # Rules for incoming packets from the internet. # $IPTABLES -A INPUT -p ALL -i $INET_IFACE -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 udpincoming_packets $IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets # # 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 -o $INET_IFACE -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 # if [ $PPPOE_PMTU == "yes" ] ; then $IPTABLES -t nat -A POSTROUTING -p tcp --tcp-flags SYN,RST SYN \ -j TCPMSS --clamp-mss-to-pmtu fi $IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j MASQUERADE # # 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 # |
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08-01-2002
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Resets iptables to default values
#!/bin/sh
# # rc.flush-iptables - Resets iptables to default values. # # 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 # # Configurations # IPTABLES="/usr/sbin/iptables" # # reset the default policies in the filter table. # $IPTABLES -P INPUT ACCEPT $IPTABLES -P FORWARD ACCEPT $IPTABLES -P OUTPUT ACCEPT # # reset the default policies in the nat table. # $IPTABLES -t nat -P PREROUTING ACCEPT $IPTABLES -t nat -P POSTROUTING ACCEPT $IPTABLES -t nat -P OUTPUT ACCEPT # # reset the default policies in the mangle table. # $IPTABLES -t mangle -P PREROUTING ACCEPT $IPTABLES -t mangle -P OUTPUT ACCEPT # # flush all the rules in the filter and nat tables. # $IPTABLES -F $IPTABLES -t nat -F $IPTABLES -t mangle -F # # erase all chains that's not default in filter and nat table. # $IPTABLES -X $IPTABLES -t nat -X $IPTABLES -t mangle -X -------------------------------------------------------------------------------- Example rc.test-iptables script #!/bin/bash # # rc.test-iptables - test script for iptables chains and tables. # # 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 # # # Filter table, all chains # iptables -t filter -A INPUT -p icmp --icmp-type echo-request \ -j LOG --log-prefix="filter INPUT:" iptables -t filter -A INPUT -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="filter INPUT:" iptables -t filter -A OUTPUT -p icmp --icmp-type echo-request \ -j LOG --log-prefix="filter OUTPUT:" iptables -t filter -A OUTPUT -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="filter OUTPUT:" iptables -t filter -A FORWARD -p icmp --icmp-type echo-request \ -j LOG --log-prefix="filter FORWARD:" iptables -t filter -A FORWARD -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="filter FORWARD:" # # NAT table, all chains except OUTPUT which don't work. # iptables -t nat -A PREROUTING -p icmp --icmp-type echo-request \ -j LOG --log-prefix="nat PREROUTING:" iptables -t nat -A PREROUTING -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="nat PREROUTING:" iptables -t nat -A POSTROUTING -p icmp --icmp-type echo-request \ -j LOG --log-prefix="nat POSTROUTING:" iptables -t nat -A POSTROUTING -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="nat POSTROUTING:" iptables -t nat -A OUTPUT -p icmp --icmp-type echo-request \ -j LOG --log-prefix="nat OUTPUT:" iptables -t nat -A OUTPUT -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="nat OUTPUT:" # # Mangle table, all chains # iptables -t mangle -A PREROUTING -p icmp --icmp-type echo-request \ -j LOG --log-prefix="mangle PREROUTING:" iptables -t mangle -A PREROUTING -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="mangle PREROUTING:" iptables -t mangle -A OUTPUT -p icmp --icmp-type echo-request \ -j LOG --log-prefix="mangle OUTPUT:" iptables -t mangle -A OUTPUT -p icmp --icmp-type echo-reply \ -j LOG --log-prefix="mangle OUTPUT:" |
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08-01-2002
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Initial SIMPLE IP Firewall script for Linux 2.4.x and iptables
#!/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="194.236.50.155" INET_IFACE="eth0" # # 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 adress. the same as netmask 255.255.255.0 # LAN_IP="192.168.0.2" LAN_IP_RANGE="192.168.0.0/16" LAN_BCAST_ADRESS="192.168.255.255" LAN_IFACE="eth1" # # 1.3 DMZ Configuration. # # # 1.4 Localhost Configuration. # LO_IFACE="lo" LO_IP="127.0.0.1" # # 1.5 IPTables Configuration. # IPTABLES="/usr/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 ########################################################################### # # 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 icmp_packets $IPTABLES -N tcp_packets $IPTABLES -N udpincoming_packets # # 4.1.3 Create content in userspecified chains # # # bad_tcp_packets chain # $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 udpincoming_packets -p UDP -s 0/0 --destination-port 53 -j ACCEPT #$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --destination-port 123 -j ACCEPT $IPTABLES -A udpincoming_packets -p UDP -s 0/0 --destination-port 2074 -j ACCEPT $IPTABLES -A udpincoming_packets -p UDP -s 0/0 --destination-port 4000 -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 # # 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 $IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_BCAST_ADRESS -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 udpincoming_packets $IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets # # 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 # # 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 # |
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08-01-2002
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Any Question on this? It seems like Scripting contest here. Hope the Q&A Rules of the forum can be understand.
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Hybrid Mode
