version 2.38, 2006/01/15 15:07:45 |
version 2.47, 2006/09/24 16:17:10 |
Line 57 AWK="${AWK:=/usr/bin/awk}" |
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Line 57 AWK="${AWK:=/usr/bin/awk}" |
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# loopback interface |
# loopback interface |
LO_IFACE="${LO_IFACE:=lo}" |
LO_IFACE="${LO_IFACE:=lo}" |
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# Hide NAT clients behind firewall |
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NAT_SET_TTL="${NAT_SET_TTL:=no}" |
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# |
# |
# CONSTANTS - Do not edit |
# CONSTANTS - Do not edit |
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mkdir -p "$DEFAULT_CACHE_DIR"; |
mkdir -p "$DEFAULT_CACHE_DIR"; |
fi |
fi |
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config=`cat $DEFAULT_FIREWALL_CONFIG`; |
config=`cat $DEFAULT_FIREWALL_CONFIG $0`; # config file and firewalling script |
md5key=`echo "config = '$config' parsed_interfaces ='$parsed_interfaces' parsed_routes='$parsed_routes'" | md5sum | awk '{ print $1; }'`; |
md5key=`echo "config = '$config' parsed_interfaces ='$parsed_interfaces' parsed_routes='$parsed_routes'" | md5sum | $AWK '{ print $1; }'`; |
CACHE_FILE="$DEFAULT_CACHE_DIR/$md5key" |
CACHE_FILE="$DEFAULT_CACHE_DIR/$md5key" |
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#echo "CACHE_FILE=$CACHE_FILE" |
#echo "CACHE_FILE=$CACHE_FILE" |
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done |
done |
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for redirect in $NAT_TCP_PORT_REDIRECT; do |
for redirect in $NAT_TCP_PORT_REDIRECT; do |
eval `echo $redirect | awk -v FS=: '{ printf "remote_port=%s; local_port=%s;", $1, $2; }'` |
eval `echo $redirect | $AWK -v FS=: '{ printf "remote_port=%s; local_port=%s;", $1, $2; }'` |
echo -en " $remote_port:$local_port" |
echo -en " $remote_port:$local_port" |
$IPTABLES -t nat -A PREROUTING -p TCP \ |
$IPTABLES -t nat -A PREROUTING -p TCP \ |
-i ! $NAT_LAN_IFACE -d ! $lan_ip \ |
-i ! $NAT_LAN_IFACE -d ! $lan_ip \ |
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if [ ! -z "$NAT_TCP_PORT_FORWARD" ]; then |
if [ ! -z "$NAT_TCP_PORT_FORWARD" ]; then |
echo -en "\tForwarding ports to local machines:" |
echo -en "\tForwarding ports to local machines:" |
for redirect in $NAT_TCP_PORT_FORWARD; do |
for redirect in $NAT_TCP_PORT_FORWARD; do |
eval `echo $redirect | awk -v FS=: '{ printf "src_port=%s; local_machine=%s; dest_port=%s;", $1, $2, $3; }'` |
eval `echo $redirect | $AWK -v FS=: '{ printf "src_port=%s; local_machine=%s; dest_port=%s;", $1, $2, $3; }'` |
echo -en " $src_port -> $local_machine:$dest_port" |
echo -en " $src_port -> $local_machine:$dest_port" |
$IPTABLES -t nat -A PREROUTING -p TCP -i $NAT_LAN_IFACE -d $lan_ip \ |
$IPTABLES -t nat -A PREROUTING -p TCP -i $NAT_LAN_IFACE -d $lan_ip \ |
--dport $src_port -j DNAT --to $local_machine:$dest_port |
--dport $src_port -j DNAT --to $local_machine:$dest_port |
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#$IPTABLES -A FORWARD -m state --state NEW -o $NAT_LAN_IFACE -j ACCEPT |
#$IPTABLES -A FORWARD -m state --state NEW -o $NAT_LAN_IFACE -j ACCEPT |
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT |
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT |
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# hide NAT clients behind firewall: - set TTL |
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# XXX: warning: this breaks traceroute !!! |
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if [ ! "a$NAT_SET_TTL" = "ano" ]; then |
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echo "NAT: clients hidden behind firewall - setting TTL to $NAT_SET_TTL" |
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$IPTABLES -t mangle -A POSTROUTING -o $NAT_LAN_IFACE -j TTL --ttl-set $NAT_SET_TTL |
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fi |
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fi |
fi |
} # }}} |
} # }}} |
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$IPTABLES -A INPUT -s $client_ip -i $NAT_SUBNET_IFACE -j DROP |
$IPTABLES -A INPUT -s $client_ip -i $NAT_SUBNET_IFACE -j DROP |
done |
done |
fi |
fi |
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if [ ! -z "$ALL_DROP_INPUT_TCP" ]; then |
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echo -en "Drop ALL INPUT TCP connections on ports:" |
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for port in $ALL_DROP_INPUT_TCP; do |
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for iface in $INTERFACES; do |
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echo -en " $port($iface)" |
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IPS="IP_$iface"; |
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for ip in ${!IPS}; do |
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$IPTABLES -A INPUT -i $iface -d $ip -p TCP --dport $port -j DROP |
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done |
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done |
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done |
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echo " done." |
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fi |
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if [ ! -z "$ALL_DROP_INPUT_UDP" ]; then |
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echo -en "Drop ALL INPUT UDP connections on ports:" |
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for port in $ALL_DROP_INPUT_UDP; do |
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for iface in $INTERFACES; do |
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echo -en " $port($iface)" |
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IPS="IP_$iface"; |
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for ip in ${!IPS}; do |
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$IPTABLES -A INPUT -i $iface -d $ip -p UDP --dport $port -j DROP |
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done |
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done |
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done |
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echo " done." |
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fi |
if [ ! -z "$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 $ALL_ACCEPT_INPUT_TCP; do |
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ip="`get_first_ip_addr IP_$iface`"; |
ip="`get_first_ip_addr IP_$iface`"; |
for redirect in $REDIRECT_TCP; do |
for redirect in $REDIRECT_TCP; do |
eval `echo $redirect | \ |
eval `echo $redirect | \ |
awk -v FS=: ' (NF == 2) { remote_ip = "0.0.0.0/0"; from_port = $1; to_port = $2; } \ |
$AWK -v FS=: ' (NF == 2) { remote_ip = "0.0.0.0/0"; from_port = $1; to_port = $2; } \ |
(NF == 3) { remote_ip = $1; from_port = $2; to_port = $3; } \ |
(NF == 3) { remote_ip = $1; from_port = $2; to_port = $3; } \ |
END { printf "remote_ip=%s; from_port=%s; to_port=%s;", remote_ip, from_port, to_port; }'` |
END { printf "remote_ip=%s; from_port=%s; to_port=%s;", remote_ip, from_port, to_port; }'` |
echo -en " $remote_ip:$from_port->$to_port" |
echo -en " $remote_ip:$from_port->$to_port" |
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ip="`get_first_ip_addr IP_$iface`"; |
ip="`get_first_ip_addr IP_$iface`"; |
for redirect in $REDIRECT_UDP; do |
for redirect in $REDIRECT_UDP; do |
eval `echo $redirect | \ |
eval `echo $redirect | \ |
awk -v FS=: ' (NF == 2) { remote_ip = "0.0.0.0/0"; from_port = $1; to_port = $2; } \ |
$AWK -v FS=: ' (NF == 2) { remote_ip = "0.0.0.0/0"; from_port = $1; to_port = $2; } \ |
(NF == 3) { remote_ip = $1; from_port = $2; to_port = $3; } \ |
(NF == 3) { remote_ip = $1; from_port = $2; to_port = $3; } \ |
END { printf "remote_ip=%s; from_port=%s; to_port=%s;", remote_ip, from_port, to_port; }'` |
END { printf "remote_ip=%s; from_port=%s; to_port=%s;", remote_ip, from_port, to_port; }'` |
echo -en " $remote_ip:$from_port->$to_port" |
echo -en " $remote_ip:$from_port->$to_port" |
Line 713 log_forward_drop() |
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Line 749 log_forward_drop() |
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} # }}} |
} # }}} |
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configure_special_rules() |
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{ # {{{ |
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echo -en "Loading special rules: " |
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## |
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## for DSL from Slovanet (Slovak DSL provider) and DSL modem DLINK DSL-360T you must add following rule for proper ssh connect to your machine |
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## |
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# echo -en "slovanet " |
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# $IPTABLES -t mangle -A OUTPUT -s 0/0 -j DSCP --set-dscp 0 |
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echo " done."; |
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} # }}} |
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do_ip_accounting() |
do_ip_accounting() |
{ # {{{ |
{ # {{{ |
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Line 743 do_ip_accounting() |
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Line 793 do_ip_accounting() |
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done |
done |
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if [ ! "x$DO_LOCAL_IP_ACCOUNTING" = "xno" ]; then |
if [ ! "x$DO_LOCAL_IP_ACCOUNTING" = "xno" ]; then |
accountig_ports=`echo "$NAT_TCP_PORT_REDIRECT " | awk -v RS=' ' -v FS=: '{ print $2; }' | sort -u -r -g ` |
accountig_ports=`echo "$NAT_TCP_PORT_REDIRECT " | $AWK -v RS=' ' -v FS=: '{ print $2; }' | sort -u -r -g ` |
for port in $accountig_ports; do |
for port in $accountig_ports; do |
$IPTABLES -I INPUT -i $NAT_SUBNET_IFACE -p TCP --dport $port -j $IPACCT_NAME |
$IPTABLES -I INPUT -i $NAT_SUBNET_IFACE -p TCP --dport $port -j $IPACCT_NAME |
$IPTABLES -I INPUT -i $NAT_SUBNET_IFACE -p UDP --dport $port -j $IPACCT_NAME |
$IPTABLES -I INPUT -i $NAT_SUBNET_IFACE -p UDP --dport $port -j $IPACCT_NAME |
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split($0, fields, "[ \t:]+"); |
split($0, fields, "[ \t:]+"); |
ip[iface, ipcount[iface]] = fields[4]; |
ip[iface, ipcount[iface]] = fields[4]; |
bcast[iface] = fields[6]; # bad for loopback interface, but we don t need this |
bcast[iface] = fields[6]; # bad for loopback interface, but we don t need this |
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# try to upgrade gawk (3.1.4-2.0.1 => 3.1.5-1) if you experience problem on the next line |
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# awk: cmd. line:17: (FILENAME=- FNR=2) fatal: attempt to use array "fields" in a scalar context |
idx = length(fields); |
idx = length(fields); |
mask[iface] = fields[idx]; |
mask[iface] = fields[idx]; |
} |
} |
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nmap_scan_filter |
nmap_scan_filter |
invalid_packet_filter |
invalid_packet_filter |
anti_spoof_filter |
anti_spoof_filter |
syn_flood |
#syn_flood |
mangle_prerouting |
mangle_prerouting |
mangle_output |
mangle_output |
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accept_related |
log_new_connections |
log_new_connections |
drop_output |
drop_output |
allow_input |
allow_input |
allow_output |
allow_output |
allow_icmp |
allow_icmp |
accept_related |
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accept_loopback |
accept_loopback |
masquerade |
masquerade |
log_input_drop |
log_input_drop |
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log_forward_drop |
log_forward_drop |
forward_on |
forward_on |
do_ip_accounting |
do_ip_accounting |
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configure_special_rules |
$IPTABLES_SAVE -c > $CACHE_FILE |
$IPTABLES_SAVE -c > $CACHE_FILE |
;; |
;; |
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