verzia 2.0, 2004/11/14 15:23:09 |
verzia 2.16, 2005/01/16 15:27:15 |
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# Can be started by init or by hand. |
# Can be started by init or by hand. |
# |
# |
# Developed by Lubomir Host 'rajo' <rajo AT platon.sk> |
# Developed by Lubomir Host 'rajo' <rajo AT platon.sk> |
# Copyright (c) 2003-2004 Platon SDG, http://platon.sk/ |
# Copyright (c) 2003-2005 Platon SDG, http://platon.sk/ |
# Licensed under terms of GNU General Public License. |
# Licensed under terms of GNU General Public License. |
# All rights reserved. |
# All rights reserved. |
# |
# |
# $Platon: scripts/shell/firewall/fw-universal.sh,v 1.1 2003/10/24 15:40:44 rajo Exp $ |
# $Platon: scripts/shell/firewall/fw-universal.sh,v 2.15 2005/01/16 12:13:32 rajo Exp $ |
# |
# |
# Changelog: |
# Changelog: |
# 2004-11-14 - created |
# 2003-10-24 - created |
# |
# |
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DESC="firewall" |
DESC="firewall" |
Riadok 33 DEFAULT_POLICY="${DEFAULT_POLICY:=DROP}" |
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Riadok 33 DEFAULT_POLICY="${DEFAULT_POLICY:=DROP}" |
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# which modules to load |
# which modules to load |
MODULES="${MODULES:=}" |
MODULES="${MODULES:=}" |
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LOG_LIMIT="${LOG_LIMIT:=-m limit --limit 12/h --limit-burst 10}" |
LOG_LIMIT="${LOG_LIMIT:=-m limit --limit 12/h --limit-burst 10 -j LOG --log-level notice --log-prefix}" |
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# Paths: |
# Paths: |
#IPTABLES=":" # for testing only - does nothing |
#IPTABLES=":" # for testing only - does nothing |
IPTABLES="${IPTABLES:=/sbin/iptables}" |
IPTABLES="${IPTABLES:=$DEBUG/sbin/iptables}" |
IFCONFIG="${IFCONFIG:=/sbin/ifconfig}" |
IFCONFIG="${IFCONFIG:=/sbin/ifconfig}" |
DEPMOD="${DEPMOD:=/sbin/depmod}" |
DEPMOD="${DEPMOD:=/sbin/depmod}" |
MODPROBE="${MODPROBE:=/sbin/modprobe}" |
MODPROBE="${MODPROBE:=/sbin/modprobe}" |
Riadok 48 AWK="${AWK:=/usr/bin/awk}" |
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Riadok 48 AWK="${AWK:=/usr/bin/awk}" |
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LO_IFACE="${LO_IFACE:=lo}" |
LO_IFACE="${LO_IFACE:=lo}" |
LO_IP="IP_$LO_IFACE" |
LO_IP="IP_$LO_IFACE" |
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# Which ports will be allowed on INPUT (TCP connections) |
# |
ALL_ACCEPT_INPUT_TCP="${ALL_ACCEPT_INPUT_TCP:=}" |
# CONSTANTS - Do not edit |
# interface eth0 |
# |
eth0_ACCEPT_INPUT_TCP="${eth0_ACCEPT_INPUT_TCP:=}" |
ANYWHERE="0.0.0.0/0" # Match any IP address |
# interface ppp0 |
BROADCAST_SRC="0.0.0.0" # Broadcast Source Address |
ppp0_ACCEPT_INPUT_TCP="${ppp0_ACCEPT_INPUT_TCP:=}" |
BROADCAST_DEST="255.255.255.255" # Broadcast Destination Address |
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CLASS_A="10.0.0.0/8" # Class-A Private (RFC-1918) Networks |
# Which ports will be allowed on INPUT (UDP connections) |
CLASS_B="172.16.0.0/12" # Class-B Private (RFC-1918) Networks |
# interface eth0 |
CLASS_C="192.168.0.0/16" # Class-C Private (RFC-1918) Networks |
eth0_ACCEPT_INPUT_UDP="${eth0_ACCEPT_INPUT_UDP:=}" |
CLASS_D_MULTICAST="224.0.0.0/4" # Class-D Multicast Addresses |
# interface ppp0 |
CLASS_E_RESERVED_NET="240.0.0.0/5" # Class-E Reserved Addresses |
ppp0_ACCEPT_INPUT_UDP="${ppp0_ACCEPT_INPUT_UDP:=}" |
PRIVPORTS="0:1023" # Well-Known, Privileged Port Range |
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UNPRIVPORTS="1024:65535" # Unprivileged Port Range |
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TRACEROUTE_SRC_PORTS="32769:65535" # Traceroute Source Ports |
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TRACEROUTE_DEST_PORTS="33434:33523" # Traceroute Destination Ports |
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# allow some ICMP packets - needed for ping etc. |
# allow some ICMP packets - needed for ping etc. |
ACCEPT_ICMP_PACKETS="${ACCEPT_ICMP_PACKETS:=echo-reply destination-unreachable echo-request time-exceeded}" |
ACCEPT_ICMP_PACKETS="${ACCEPT_ICMP_PACKETS:=echo-reply destination-unreachable echo-request time-exceeded}" |
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# load necessary modules from $MODULES variable |
# load necessary modules from $MODULES variable |
load_modules() |
load_modules() |
{ # {{{ |
{ # {{{ |
Riadok 116 antispoof_on() |
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Riadok 121 antispoof_on() |
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# clear status of iptable chains |
# clear status of iptable chains |
remove_chains() |
remove_chains() |
{ # {{{ |
{ # {{{ |
$IPTABLES -F # clear all chains |
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$IPTABLES -X # remove all chains |
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} # }}} |
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# all packets on loopback are accpted |
for table in filter nat mangle; do |
set_loopback() |
$IPTABLES -t $table -F # clear all chains |
{ # {{{ |
$IPTABLES -t $table -X # remove all chains |
$IPTABLES -A INPUT -j ACCEPT -i $LO_IFACE |
done |
$IPTABLES -A OUTPUT -j ACCEPT -o $LO_IFACE |
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} # }}} |
} # }}} |
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# DROP packages from nmap(1) |
# DROP packages from nmap(1) |
Riadok 135 nmap_scan_filter() |
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Riadok 137 nmap_scan_filter() |
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for chain in INPUT FORWARD; do |
for chain in INPUT FORWARD; do |
# Nie je nastaveny ziaden bit |
# Nie je nastaveny ziaden bit |
$IPTABLES -A $chain -p TCP --tcp-flags ALL NONE $LOG_LIMIT -j LOG --log-prefix "nmap scan $chain ALL NONE: " |
$IPTABLES -A $chain -p TCP --tcp-flags ALL NONE $LOG_LIMIT "nmap scan $chain ALL NONE: " |
echo -en "." |
echo -en "." |
$IPTABLES -A $chain -p TCP --tcp-flags ALL NONE -j DROP |
$IPTABLES -A $chain -p TCP --tcp-flags ALL NONE -j DROP |
echo -en "." |
echo -en "." |
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# dva odporujuuce si flagy su nastavene: |
# dva odporujuuce si flagy su nastavene: |
for flags in SYN,FIN SYN,RST FIN,RST ; do |
for flags in SYN,FIN SYN,RST FIN,RST ; do |
$IPTABLES -A $chain -p TCP --tcp-flags $flags $flags $LOG_LIMIT -j LOG --log-prefix "nmap scan $chain $flags: " |
$IPTABLES -A $chain -p TCP --tcp-flags $flags $flags $LOG_LIMIT "nmap scan $chain $flags: " |
echo -en "." |
echo -en "." |
$IPTABLES -A $chain -p TCP --tcp-flags $flags $flags -j DROP |
$IPTABLES -A $chain -p TCP --tcp-flags $flags $flags -j DROP |
echo -en "." |
echo -en "." |
Riadok 150 nmap_scan_filter() |
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Riadok 152 nmap_scan_filter() |
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# je nastavene len $flags bez predpokladaneho ACK |
# je nastavene len $flags bez predpokladaneho ACK |
for flags in FIN PSH URG ; do |
for flags in FIN PSH URG ; do |
$IPTABLES -A $chain -p TCP --tcp-flags ACK,$flags $flags $LOG_LIMIT -j LOG --log-prefix "nmap scan $chain ACK,$flags: " |
$IPTABLES -A $chain -p TCP --tcp-flags ACK,$flags $flags $LOG_LIMIT "nmap scan $chain ACK,$flags: " |
echo -en "." |
echo -en "." |
$IPTABLES -A $chain -p TCP --tcp-flags ACK,$flags $flags -j DROP |
$IPTABLES -A $chain -p TCP --tcp-flags ACK,$flags $flags -j DROP |
echo -en "." |
echo -en "." |
Riadok 167 invalid_packet_filter() |
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Riadok 169 invalid_packet_filter() |
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echo -en "Turning on INVALID packet filter " |
echo -en "Turning on INVALID packet filter " |
for chain in INPUT OUTPUT FORWARD; do |
for chain in INPUT OUTPUT FORWARD; do |
$IPTABLES -A $chain -m state --state INVALID $LOG_LIMIT -j LOG --log-prefix "INVALID $chain: " |
$IPTABLES -A $chain -m state --state INVALID $LOG_LIMIT "INVALID $chain: " |
echo -en "." |
echo -en "." |
$IPTABLES -A $chain -m state --state INVALID -j DROP |
$IPTABLES -A $chain -m state --state INVALID -j DROP |
echo -en "." |
echo -en "." |
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anti_spoof_filter() |
anti_spoof_filter() |
{ # {{{ |
{ # {{{ |
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# http://www.iana.com/assignments/ipv4-address-space |
# http://www.iana.com/assignments/ipv4-address-space |
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INET_IFACE=$1 |
if [ ! -z "$ANTISPOOF_IFACE" ]; then |
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$IPTABLES -N spoof |
echo -en "Turning on antispoof filter for interfaces: " |
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$IPTABLES -N spoof |
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echo "Turning on antispoof filter for interface $INET_IFACE " |
# Ochrana proti Spoogingu zo spatnej slucky |
# Ochrana proti Spoogingu zo spatnej slucky |
$IPTABLES -A spoof -s 127.0.0.0/8 $LOG_LIMIT "RESERVED:127.0.0.0/8 src" |
$IPTABLES -A spoof -i $INET_IFACE -s 127.0.0.0/8 $LOG_LIMIT -j LOG --log-prefix "Reserved IP:127.0.0.0/8 src" |
$IPTABLES -A spoof -s 127.0.0.0/8 -j DROP |
$IPTABLES -A spoof -i $INET_IFACE -s 127.0.0.0/8 -j DROP |
$IPTABLES -A spoof -d 127.0.0.0/8 $LOG_LIMIT "RESERVED:127.0.0.0/8 dest" |
$IPTABLES -A spoof -i $INET_IFACE -d 127.0.0.0/8 $LOG_LIMIT -j LOG --log-prefix "Reserved IP:127.0.0.0/8 dest" |
$IPTABLES -A spoof -d 127.0.0.0/8 -j DROP |
$IPTABLES -A spoof -i $INET_IFACE -d 127.0.0.0/8 -j DROP |
# Ochrana proti Spoofingu Internetu z adries urcenych pre lokalne siete |
# Ochrana proti Spoofingu Internetu z adries urcenych pre lokalne siete |
$IPTABLES -A spoof -s 192.168.0.0/16 $LOG_LIMIT "RESERVED:192.168.0.0/16 src" |
$IPTABLES -A spoof -i $INET_IFACE -s 192.168.0.0/16 $LOG_LIMIT -j LOG --log-prefix "Reserved IP:192.168.0.0/16 src" |
$IPTABLES -A spoof -s 192.168.0.0/16 -j DROP # RFC1918 |
$IPTABLES -A spoof -i $INET_IFACE -s 192.168.0.0/16 -j DROP # RFC1918 |
$IPTABLES -A spoof -s 172.16.0.0/12 $LOG_LIMIT "RESERVED:172.16.0.0/12 src" |
$IPTABLES -A spoof -i $INET_IFACE -s 172.16.0.0/12 $LOG_LIMIT -j LOG --log-prefix "Reserved IP:172.16.0.0/12 src" |
$IPTABLES -A spoof -s 172.16.0.0/12 -j DROP # RFC1918 |
$IPTABLES -A spoof -i $INET_IFACE -s 172.16.0.0/12 -j DROP # RFC1918 |
$IPTABLES -A spoof -s 10.0.0.0/8 $LOG_LIMIT "RESERVED:10.0.0.0/8 src" |
$IPTABLES -A spoof -i $INET_IFACE -s 10.0.0.0/8 $LOG_LIMIT -j LOG --log-prefix "Reserved IP:10.0.0.0/8 src" |
$IPTABLES -A spoof -s 10.0.0.0/8 -j DROP # RFC1918 len pre sietovy interface do Internetu, kedze 10.0.0.0 je adresa LAN |
$IPTABLES -A spoof -i $INET_IFACE -s 10.0.0.0/8 -j DROP # RFC1918 len pre sietovy interface do Internetu, kedze 10.0.0.0 je adresa LAN |
$IPTABLES -A spoof -s 96.0.0.0/4 $LOG_LIMIT "RESERVED:96.0.0.0/4 src" |
$IPTABLES -A spoof -i $INET_IFACE -s 96.0.0.0/4 $LOG_LIMIT -j LOG --log-prefix "Reserved IP:96.0.0.0/4 src" |
$IPTABLES -A spoof -s 96.0.0.0/4 -j DROP # IANA |
$IPTABLES -A spoof -i $INET_IFACE -s 96.0.0.0/4 -j DROP # IANA |
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echo " done." |
for iface in $ANTISPOOF_IFACE; do |
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echo -en " $iface" |
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$IPTABLES -A FORWARD -i $iface -j spoof |
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$IPTABLES -A INPUT -i $iface -j spoof |
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done |
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echo " done." |
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fi |
} # }}} |
} # }}} |
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mangle_prerouting() |
mangle_prerouting() |
Riadok 261 mangle_output() |
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Riadok 270 mangle_output() |
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} # }}} |
} # }}} |
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# Masquerade local subnet |
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masquerade() |
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{ # {{{ |
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if [ ! -z "$NAT_LAN_IFACE" ]; then |
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echo -en "NAT: Masquerading local subnet: $NAT_SUBNET_IFACE --> $NAT_LAN_IFACE" |
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ip="IP_$NAT_SUBNET_IFACE"; |
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netmask="Mask_$NAT_SUBNET_IFACE" |
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localnet="${!ip}/${!netmask}" |
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lan_ip="IP_$NAT_LAN_IFACE" |
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# alow packets from private subnet |
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$IPTABLES -A FORWARD -s ! $localnet -i $NAT_SUBNET_IFACE -j DROP |
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for redirect in $NAT_TCP_PORT_REDIRECT; do |
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eval `echo $redirect | awk -v FS=: '{ printf "remote_port=%s; local_port=%s;", $1, $2; }'` |
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echo -en " $remote_port:$local_port" |
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$IPTABLES -t nat -A PREROUTING -p TCP \ |
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-i ! $NAT_LAN_IFACE -d ! ${!lan_ip} \ |
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--dport $remote_port -j REDIRECT --to-port $local_port |
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done |
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#$IPTABLES -t nat -A POSTROUTING -s $localnet -o $NAT_LAN_IFACE -j MASQUERADE |
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$IPTABLES -t nat -A POSTROUTING -o $NAT_LAN_IFACE -j MASQUERADE |
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echo " done." |
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# don't forward Miscrosoft protocols - NOT RFC compliant packets |
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if [ ! -z "$NAT_FORWARD_MICROSOFT" ]; then |
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if [ "x$NAT_FORWARD_MICROSOFT" = "xno" ]; then |
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$IPTABLES -A FORWARD -p TCP ! --syn -m state --state NEW -j DROP |
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for port in 69 135 445 1434 6667; do |
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$IPTABLES -A FORWARD -p TCP --dport $port -j DROP |
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$IPTABLES -A FORWARD -p UDP --dport $port -j DROP |
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done |
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fi |
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fi |
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if [ ! -z "$NAT_FORWARD_TCP_PORTS" ]; then |
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echo -en "\tAccepting FORWARD TCP ports:" |
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for port in $NAT_FORWARD_TCP_PORTS; do |
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echo -en " $port" |
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$IPTABLES -A FORWARD -p TCP --dport $port -m state --state NEW -j ACCEPT |
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done |
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echo " done." |
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fi |
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if [ ! -z "$NAT_FORWARD_UDP_PORTS" ]; then |
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echo -en "\tAccepting FORWARD UDP ports:" |
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for port in $NAT_FORWARD_UDP_PORTS; do |
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echo -en " $port" |
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$IPTABLES -A FORWARD -p UDP --dport $port -m state --state NEW -j ACCEPT |
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done |
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echo " done." |
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fi |
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echo -en "\tAccepting ICMP packets:" |
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for type in $ACCEPT_ICMP_PACKETS; do |
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echo -en " $type" |
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$IPTABLES -A FORWARD -p ICMP --icmp-type $type -j ACCEPT |
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done |
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#$IPTABLES -A FORWARD -p ICMP -j LOG --log-prefix "FWD ICMP: " |
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echo " done." |
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# Keep state of connections from private subnets |
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$IPTABLES -A OUTPUT -m state --state NEW -o $NAT_LAN_IFACE -j ACCEPT |
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#$IPTABLES -A FORWARD -m state --state NEW -o $NAT_LAN_IFACE -j ACCEPT |
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$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT |
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fi |
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} # }}} |
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log_new_connections() |
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{ # {{{ |
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if [ ! -z "$NAT_LOG_NEW_CONNECTIONS" ]; then |
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if [ "x$NAT_LOG_NEW_CONNECTIONS" = "xyes" ]; then |
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echo -en "Logging new connections:" |
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$IPTABLES -A INPUT -m state --state NEW -j LOG --log-prefix "IN connection: " |
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$IPTABLES -A OUTPUT -m state --state NEW -j LOG --log-prefix "OUT connection: " |
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$IPTABLES -A FORWARD -m state --state NEW -j LOG --log-prefix "FWD connection: " |
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echo " done." |
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fi |
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fi |
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} # }}} |
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drop_output() |
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{ # {{{ |
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for iface in $INTERFACES; do |
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ip="IP_$iface"; |
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drop_output_tcp="${iface}_DROP_OUTPUT_TCP" |
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DROP_OUTPUT_TCP="${!drop_output_tcp}" |
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drop_output_udp="${iface}_DROP_OUTPUT_UDP" |
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DROP_OUTPUT_UDP="${!drop_output_udp}" |
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if [ ! -z "$DROP_OUTPUT_TCP" ]; then |
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echo -en "$iface: Dropping outgoing packets from ports:" |
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for port in $DROP_OUTPUT_TCP; do |
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echo -en " $port" |
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$IPTABLES -A FORWARD -p TCP --sport $port -o $iface -j DROP |
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$IPTABLES -A OUTPUT -p TCP --sport $port -o $iface -j DROP |
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done |
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echo " done." |
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fi |
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if [ ! -z "$DROP_OUTPUT_UDP" ]; then |
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echo -en "$iface: Dropping outgoing packets from ports:" |
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for port in $DROP_OUTPUT_UDP; do |
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echo -en " $port" |
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$IPTABLES -A FORWARD -p UDP --sport $port -o $iface -j DROP |
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$IPTABLES -A OUTPUT -p UDP --sport $port -o $iface -j DROP |
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done |
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echo " done." |
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fi |
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done |
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} # }}} |
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allow_accept_all() |
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{ # {{{ |
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if [ ! -z "$IFACE_ACCEPT_ALL" ]; then |
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echo -en "Accepting ALL packets on interfaces:" |
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for iface in $IFACE_ACCEPT_ALL; do |
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echo -en " $iface" |
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$IPTABLES -A INPUT -i $iface -j ACCEPT |
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$IPTABLES -A FORWARD -i $iface -j ACCEPT |
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$IPTABLES -A OUTPUT -o $iface -j ACCEPT |
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done |
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echo " done." |
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fi |
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} # }}} |
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allow_input() |
allow_input() |
{ # {{{ |
{ # {{{ |
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if [ ! -z "$ALL_ACCEPT_INPUT_TCP" ]; then |
if [ ! -z "$ALL_ACCEPT_INPUT_TCP" ]; then |
echo -en "Accepting ALL INPUT TCP connections on ports:" |
echo -en "Accepting ALL INPUT TCP connections on ports:" |
for port in $ALL_ACCEPT_INPUT_TCP; do |
for port in $ALL_ACCEPT_INPUT_TCP; do |
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done |
done |
echo " done." |
echo " done." |
fi |
fi |
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if [ ! -z "$ALL_ACCEPT_INPUT_UDP" ]; then |
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echo -en "Accepting ALL INPUT UDP connections on ports:" |
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for port in $ALL_ACCEPT_INPUT_UDP; do |
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for iface in $INTERFACES; do |
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ip="IP_$iface"; |
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echo -en " $port($iface)" |
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$IPTABLES -A INPUT -i $iface -p UDP --dport $port -j ACCEPT |
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done |
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done |
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echo " done." |
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fi |
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for iface in $INTERFACES; do |
for iface in $INTERFACES; do |
ip="IP_$iface"; |
ip="IP_$iface"; |
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ACCEPT_INPUT_UDP="${!accept_input_udp}" |
ACCEPT_INPUT_UDP="${!accept_input_udp}" |
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if [ ! -z "$ACCEPT_INPUT_TCP" ]; then |
if [ ! -z "$ACCEPT_INPUT_TCP" ]; then |
echo -en "$iface: Accepting INPUT TCP connections on ports: " |
echo -en "$iface: Accepting INPUT TCP connections on ports:" |
for port in $ACCEPT_INPUT_TCP; do |
for port in $ACCEPT_INPUT_TCP; do |
echo -en " $port" |
echo -en " $port" |
$IPTABLES -A INPUT -i $iface -d ${!ip} -p TCP --dport $port -j ACCEPT |
$IPTABLES -A INPUT -i $iface -d ${!ip} -p TCP --dport $port -j ACCEPT |
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fi |
fi |
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if [ ! -z "$ACCEPT_INPUT_UDP" ]; then |
if [ ! -z "$ACCEPT_INPUT_UDP" ]; then |
echo -en "$iface: Accepting INPUT UDP connections on ports: " |
echo -en "$iface: Accepting INPUT UDP connections on ports:" |
for port in $ACCEPT_INPUT_UDP; do |
for port in $ACCEPT_INPUT_UDP; do |
echo -en " $port" |
echo -en " $port" |
#$IPTABLES -A INPUT -i $iface -d ${!INET_IP} -p UDP --dport $port -j ACCEPT |
#$IPTABLES -A INPUT -i $iface -d ${!INET_IP} -p UDP --dport $port -j ACCEPT |
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fi |
fi |
done |
done |
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# Enable outgoing TRACEROUTE requests (required e.g. by Skype, http://www.skype.com) |
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if [ ! -z "$TRACEROUTE_IFACE" ]; then |
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ip="IP_$ANTISPOOF_IFACE"; |
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echo -en "Accepting traceroute:" |
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$IPTABLES -A OUTPUT -o $ANTISPOOF_IFACE -p UDP \ |
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--sport $TRACEROUTE_SRC_PORTS --dport $TRACEROUTE_DEST_PORTS \ |
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-s ${!ip} -d $ANYWHERE -j ACCEPT |
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for iface in $TRACEROUTE_IFACE; do |
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$IPTABLES -A FORWARD -p UDP -i $iface --sport $TRACEROUTE_SRC_PORTS \ |
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--dport $TRACEROUTE_DEST_PORTS -j ACCEPT |
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done |
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echo " done." |
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fi |
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} # }}} |
} # }}} |
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# ACCEPT all packets from our IP address |
# ACCEPT all packets from our IP address |
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$IPTABLES -A INPUT -p TCP --dport 113 -j REJECT --reject-with tcp-reset #AUTH server |
$IPTABLES -A INPUT -p TCP --dport 113 -j REJECT --reject-with tcp-reset #AUTH server |
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# accept only allowed ICMP packets |
# accept only allowed ICMP packets |
for type in echo-reply destination-unreachable echo-request time-exceeded; do |
for type in $ACCEPT_ICMP_PACKETS; do |
echo -en " $type" |
echo -en " $type" |
for iface in $INTERFACES; do |
for iface in $INTERFACES; do |
ip="IP_$iface"; |
ip="IP_$iface"; |
$IPTABLES -A INPUT -i $iface -d ${!ip} -p ICMP --icmp-type $type -j ACCEPT |
$IPTABLES -A INPUT -i $iface -d ${!ip} -p ICMP --icmp-type $type -j ACCEPT |
done |
done |
done |
done |
|
#$IPTABLES -A INPUT -p ICMP -j LOG --log-prefix "IN ICMP: " |
|
#$IPTABLES -A OUTPUT -p ICMP -j LOG --log-prefix "OUT ICMP: " |
echo " done." |
echo " done." |
|
|
} # }}} |
} # }}} |
Riadok 346 log_input_drop() |
|
Riadok 519 log_input_drop() |
|
|
|
prefix="input drop: " |
prefix="input drop: " |
echo "Input drop is logged with prefix '$prefix'" |
echo "Input drop is logged with prefix '$prefix'" |
$IPTABLES -A INPUT $LOG_LIMIT -j LOG --log-prefix "$prefix" |
$IPTABLES -A INPUT $LOG_LIMIT "$prefix" |
|
|
} # }}} |
} # }}} |
|
|
Riadok 355 log_output_drop() |
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Riadok 528 log_output_drop() |
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|
|
prefix="output drop: " |
prefix="output drop: " |
echo "Output drop is logged with prefix '$prefix'" |
echo "Output drop is logged with prefix '$prefix'" |
# Ostatní pakety logujeme (neměly by být žádné takové) |
$IPTABLES -A OUTPUT $LOG_LIMIT "$prefix" |
$IPTABLES -A OUTPUT $LOG_LIMIT -j LOG --log-prefix "$prefix" |
|
|
} # }}} |
|
|
|
log_forward_drop() |
|
{ # {{{ |
|
|
|
prefix="forward drop: " |
|
echo "Forward drop is logged with prefix '$prefix'" |
|
$IPTABLES -A FORWARD $LOG_LIMIT "$prefix" |
|
|
} # }}} |
} # }}} |
|
|
Riadok 367 accept_related() |
|
Riadok 548 accept_related() |
|
for iface in $INTERFACES; do |
for iface in $INTERFACES; do |
ip="IP_$iface"; |
ip="IP_$iface"; |
echo -en " ${!ip}($iface)" |
echo -en " ${!ip}($iface)" |
$IPTABLES -A INPUT -i $iface -d ${!ip} -m state --state ESTABLISHED,RELATED -j ACCEPT |
$IPTABLES -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT |
done |
done |
echo " done." |
echo " done." |
|
|
Riadok 430 parse_ifconfig() |
|
Riadok 611 parse_ifconfig() |
|
parse_ifconfig |
parse_ifconfig |
print_iface_status |
print_iface_status |
|
|
# $interfaces - all interfaces |
# |
|
# Split interfaces into 2 groups: |
|
# |
|
# $INTERFACES_ACCEPT_ALL - interfaces withouth restrictions |
|
# |
# $INTERFACES - all interfaces withouth loopback |
# $INTERFACES - all interfaces withouth loopback |
|
# and devices without restrictions (e.g. tun0 tun1 tap0 ...) |
|
# |
|
# list of all interfaces is in $interfaces variable |
|
# |
INTERFACES="" |
INTERFACES="" |
|
INTERFACES_ACCEPT_ALL="" |
|
regexp='^\('`echo $IFACE_ACCEPT_ALL | sed 's/ /\\\|/g; s/+/.*/g;'`'\)$' |
for iface in $interfaces; do |
for iface in $interfaces; do |
if [ "o$iface" = "olo" ]; then continue; fi |
#if [ "o$iface" = "olo" ]; then continue; fi |
INTERFACES="$INTERFACES $iface"; |
echo $iface | grep -q -e "$regexp" |
|
if [ $? = 0 ] || [ "o$iface" = "olo" ]; then # lo interface is always here |
|
INTERFACES_ACCEPT_ALL="$INTERFACES_ACCEPT_ALL $iface"; |
|
else |
|
INTERFACES="$INTERFACES $iface"; |
|
fi |
done |
done |
|
|
|
|
|
|
# Inicialize modules |
# Inicialize modules |
$DEPMOD -a |
$DEPMOD -a |
load_modules |
load_modules |
|
set_default_policy |
remove_chains |
remove_chains |
# |
# |
# (un)commnet next lines as needed |
# (un)commnet next lines as needed |
# |
# |
set_default_policy |
allow_accept_all |
set_loopback |
|
nmap_scan_filter |
nmap_scan_filter |
invalid_packet_filter |
invalid_packet_filter |
#anti_spoof_filter eth0 |
anti_spoof_filter |
syn_flood |
syn_flood |
mangle_prerouting |
mangle_prerouting |
mangle_output |
mangle_output |
|
log_new_connections |
|
drop_output |
allow_input |
allow_input |
allow_output |
allow_output |
allow_icmp |
allow_icmp |
accept_related |
accept_related |
accept_loopback |
accept_loopback |
|
masquerade |
log_input_drop |
log_input_drop |
log_output_drop |
log_output_drop |
|
log_forward_drop |
;; |
;; |
|
|
stop) |
stop) |
echo -n "Stopping $DESC: " |
echo -n "Stopping $DESC: " |
remove_chains |
|
set_default_policy |
set_default_policy |
|
remove_chains |
unload_modules |
unload_modules |
;; |
;; |
|
|