version 2.3, 2004/12/30 23:16:20 |
version 2.9, 2005/01/04 19:58:42 |
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# 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 2.2 2004/12/12 18:00:11 rajo Exp $ |
# $Platon: scripts/shell/firewall/fw-universal.sh,v 2.8 2005/01/04 19:57:14 rajo Exp $ |
# |
# |
# Changelog: |
# Changelog: |
# 2004-11-14 - created |
# 2004-11-14 - created |
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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 |
for table in filter nat mangle; do |
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$IPTABLES -t $table -F # clear all chains |
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$IPTABLES -t $table -X # remove all chains |
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done |
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} # }}} |
} # }}} |
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# all packets on loopback are accpted |
# all packets on loopback are accpted |
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masquerade() |
masquerade() |
{ # {{{ |
{ # {{{ |
if [ ! -z "$NAT_LAN_IFACE" ]; then |
if [ ! -z "$NAT_LAN_IFACE" ]; then |
echo -en "Masquerading local subnet: $NAT_SUBNET_IFACE --> $NAT_LAN_IFACE" |
echo -en "NAT: Masquerading local subnet: $NAT_SUBNET_IFACE --> $NAT_LAN_IFACE" |
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ip="IP_$NAT_SUBNET_IFACE"; |
ip="IP_$NAT_SUBNET_IFACE"; |
netmask="Mask_$NAT_SUBNET_IFACE" |
netmask="Mask_$NAT_SUBNET_IFACE" |
localnet="${!ip}/${!netmask}" |
localnet="${!ip}/${!netmask}" |
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lan_ip="IP_$NAT_LAN_IFACE" |
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# alow packets from private subnet |
# alow packets from private subnet |
$IPTABLES -A FORWARD -s ! $localnet -i $NAT_SUBNET_IFACE -j DROP |
$IPTABLES -A FORWARD -s ! $localnet -i $NAT_SUBNET_IFACE -j DROP |
$IPTABLES -A INPUT -i $NAT_SUBNET_IFACE -j ACCEPT |
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$IPTABLES -A FORWARD -i $NAT_SUBNET_IFACE -j ACCEPT |
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$IPTABLES -t nat -A POSTROUTING -s $localnet -o $NAT_LAN_IFACE -j MASQUERADE |
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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# 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 $NAT_LAN_IFACE -j ACCEPT |
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iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT |
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echo " done." |
echo " done." |
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# don't forward Miscrosoft protocols - NOT RFC compliant packets |
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if [ ! -z "$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 $type -j ACCEPT |
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done |
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echo " done." |
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# Keep state of connections from private subnets |
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$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 |
fi |
fi |
} # }}} |
} # }}} |
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echo -en " $iface" |
echo -en " $iface" |
$IPTABLES -A INPUT -i $iface -j ACCEPT |
$IPTABLES -A INPUT -i $iface -j ACCEPT |
$IPTABLES -A FORWARD -i $iface -j ACCEPT |
$IPTABLES -A FORWARD -i $iface -j ACCEPT |
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$IPTABLES -A OUTPUT -o $iface -j ACCEPT |
done |
done |
echo " done." |
echo " done." |
fi |
fi |
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$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"; |
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syn_flood |
syn_flood |
mangle_prerouting |
mangle_prerouting |
mangle_output |
mangle_output |
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log_new_connections |
drop_output |
drop_output |
allow_input |
allow_input |
allow_output |
allow_output |