Compare commits
1 commit
Author | SHA1 | Date | |
---|---|---|---|
Victor LABORIE | 4cce49988b |
233
minifirewall
233
minifirewall
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@ -41,6 +41,7 @@ IPT6=/sbin/ip6tables
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# TCP/IP variables
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# TCP/IP variables
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LOOPBACK='127.0.0.0/8'
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LOOPBACK='127.0.0.0/8'
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LOOPBACK6='::1'
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CLASSA='10.0.0.0/8'
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CLASSA='10.0.0.0/8'
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CLASSB='172.16.0.0/12'
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CLASSB='172.16.0.0/12'
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CLASSC='192.168.0.0/16'
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CLASSC='192.168.0.0/16'
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@ -52,6 +53,47 @@ PORTSROOT='0:1023'
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PORTSUSER='1024:65535'
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PORTSUSER='1024:65535'
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ipxtables() {
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set +e
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ip=$1
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echo "$ip"|grep -q ":"
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if [ $? -ne 0 ]; then
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echo $IPT
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else
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echo $IPT6
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fi
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set -e
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}
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ipalltables() {
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iptables $@
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ip6tables $@
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}
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check_addr() {
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set +e
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addr=$1
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echo $addr|grep -q "/"
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if [ $? -eq 0 ]; then
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echo $addr
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else
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host=$(host $addr)
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if [ $? -ne 0 ]; then
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echo "WARNING: $addr is invalid !" >&2
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else
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echo "$host"|grep -q "address"
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if [ $? -eq 0 ]; then
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echo "$host"|grep -v "mail"|awk '{ print $NF }'|while read ip; do
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echo $ip
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done
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else
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echo $addr
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fi
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fi
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fi
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set -e
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}
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case "$1" in
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case "$1" in
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start)
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start)
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@ -102,12 +144,12 @@ done
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# IPTables configuration
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# IPTables configuration
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########################
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########################
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$IPT -N LOG_DROP
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ipalltables -N LOG_DROP
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$IPT -A LOG_DROP -j LOG --log-prefix '[IPTABLES DROP] : '
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ipalltables -A LOG_DROP -j LOG #--log-prefix '[IPTABLES DROP] : '
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$IPT -A LOG_DROP -j DROP
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ipalltables -A LOG_DROP -j DROP
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$IPT -N LOG_ACCEPT
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ipalltables -N LOG_ACCEPT
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$IPT -A LOG_ACCEPT -j LOG --log-prefix '[IPTABLES ACCEPT] : '
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ipalltables -A LOG_ACCEPT -j LOG #--log-prefix '[IPTABLES ACCEPT] : '
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$IPT -A LOG_ACCEPT -j ACCEPT
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ipalltables -A LOG_ACCEPT -j ACCEPT
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# Configuration
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# Configuration
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oldconfigfile="/etc/firewall.rc"
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oldconfigfile="/etc/firewall.rc"
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@ -133,36 +175,37 @@ fi
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rm $tmpfile
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rm $tmpfile
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# Trusted ip addresses
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# Trusted ip addresses
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$IPT -N ONLYTRUSTED
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ipalltables -N ONLYTRUSTED
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$IPT -A ONLYTRUSTED -j LOG_DROP
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ipalltables -A ONLYTRUSTED -j LOG_DROP
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for x in $TRUSTEDIPS
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for addr in $TRUSTEDIPS; do
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do
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check_addr $addr|while read ip; do
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$IPT -I ONLYTRUSTED -s $x -j ACCEPT
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$(ipxtables $ip) -I ONLYTRUSTED -s $ip -j ACCEPT
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done
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done
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done
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# Privilegied ip addresses
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# Privilegied ip addresses
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# (trusted ip addresses *are* privilegied)
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# (trusted ip addresses *are* privilegied)
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$IPT -N ONLYPRIVILEGIED
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ipalltables -N ONLYPRIVILEGIED
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$IPT -A ONLYPRIVILEGIED -j ONLYTRUSTED
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ipalltables -A ONLYPRIVILEGIED -j ONLYTRUSTED
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for x in $PRIVILEGIEDIPS
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for addr in $PRIVILEGIEDIPS; do
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do
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check_addr $addr|while read ip; do
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$IPT -I ONLYPRIVILEGIED -s $x -j ACCEPT
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$(ipxtables $ip) -I ONLYPRIVILEGIED -s $ip -j ACCEPT
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done
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done
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done
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# Chain for restrictions (blacklist IPs/ranges)
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# Chain for restrictions (blacklist IPs/ranges)
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$IPT -N NEEDRESTRICT
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ipalltables -N NEEDRESTRICT
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# We allow all on loopback interface
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# We allow all on loopback interface
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$IPT -A INPUT -i lo -j ACCEPT
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ipalltables -A INPUT -i lo -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -i lo -j ACCEPT
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# if OUTPUTDROP
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# if OUTPUTDROP
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$IPT -A OUTPUT -o lo -j ACCEPT
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ipalltables -A OUTPUT -o lo -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o lo -j ACCEPT
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# We avoid "martians" packets, typical when W32/Blaster virus
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# We avoid "martians" packets, typical when W32/Blaster virus
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# attacked windowsupdate.com and DNS was changed to 127.0.0.1
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# attacked windowsupdate.com and DNS was changed to 127.0.0.1
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# $IPT -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
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# ipalltables -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
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$IPT -A INPUT -s $LOOPBACK ! -i lo -j DROP
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$IPT -A INPUT -s $LOOPBACK ! -i lo -j DROP
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$IPT6 -A INPUT -s $LOOPBACK6 ! -i lo -j DROP
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# Local services restrictions
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# Local services restrictions
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@ -174,47 +217,45 @@ $IPT -A INPUT -s $INTLAN -j ACCEPT
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# Enable protection chain for sensible services
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# Enable protection chain for sensible services
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for x in $SERVICESTCP1p
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for x in $SERVICESTCP1p
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do
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do
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$IPT -A INPUT -p tcp --dport $x -j NEEDRESTRICT
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ipalltables -A INPUT -p tcp --dport $x -j NEEDRESTRICT
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done
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done
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for x in $SERVICESUDP1p
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for x in $SERVICESUDP1p
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do
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do
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$IPT -A INPUT -p udp --dport $x -j NEEDRESTRICT
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ipalltables -A INPUT -p udp --dport $x -j NEEDRESTRICT
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done
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done
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# Public service
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# Public service
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for x in $SERVICESTCP1
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for x in $SERVICESTCP1
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do
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do
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$IPT -A INPUT -p tcp --dport $x -j ACCEPT
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ipalltables -A INPUT -p tcp --dport $x -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p tcp --dport $x -j ACCEPT
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done
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done
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for x in $SERVICESUDP1
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for x in $SERVICESUDP1
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do
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do
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$IPT -A INPUT -p udp --dport $x -j ACCEPT
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ipalltables -A INPUT -p udp --dport $x -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p udp --dport $x -j ACCEPT
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done
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done
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# Privilegied services
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# Privilegied services
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for x in $SERVICESTCP2
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for x in $SERVICESTCP2
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do
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do
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$IPT -A INPUT -p tcp --dport $x -j ONLYPRIVILEGIED
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ipalltables -A INPUT -p tcp --dport $x -j ONLYPRIVILEGIED
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done
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done
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for x in $SERVICESUDP2
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for x in $SERVICESUDP2
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do
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do
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$IPT -A INPUT -p udp --dport $x -j ONLYPRIVILEGIED
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ipalltables -A INPUT -p udp --dport $x -j ONLYPRIVILEGIED
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done
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done
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# Private services
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# Private services
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for x in $SERVICESTCP3
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for x in $SERVICESTCP3
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do
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do
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$IPT -A INPUT -p tcp --dport $x -j ONLYTRUSTED
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ipalltables -A INPUT -p tcp --dport $x -j ONLYTRUSTED
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done
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done
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for x in $SERVICESUDP3
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for x in $SERVICESUDP3
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do
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do
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$IPT -A INPUT -p udp --dport $x -j ONLYTRUSTED
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ipalltables -A INPUT -p udp --dport $x -j ONLYTRUSTED
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done
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done
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@ -224,87 +265,89 @@ for x in $SERVICESUDP3
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# DNS authorizations
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# DNS authorizations
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for x in $DNSSERVEURS
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for x in $DNSSERVEURS
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do
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do
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$IPT -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
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ipalltables -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
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$IPT -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
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ipalltables -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
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$IPT -A OUTPUT -o $INT -p udp -d $x --dport 53 --match state --state NEW -j ACCEPT
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ipalltables -A OUTPUT -o $INT -p udp -d $x --dport 53 --match state --state NEW -j ACCEPT
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done
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done
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# HTTP (TCP/80) authorizations
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# HTTP (TCP/80) authorizations
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for x in $HTTPSITES
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for addr in $HTTPSITES
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do
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do
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$IPT -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $x -j ACCEPT
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check_addr $addr|while read ip; do
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$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $ip -j ACCEPT
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done
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done
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done
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# HTTPS (TCP/443) authorizations
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# HTTPS (TCP/443) authorizations
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for x in $HTTPSSITES
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for addr in $HTTPSSITES
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do
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do
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$IPT -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $x -j ACCEPT
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check_addr $addr|while read ip; do
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$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $ip -j ACCEPT
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done
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done
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done
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# FTP (so complex protocol...) authorizations
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# FTP (so complex protocol...) authorizations
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for x in $FTPSITES
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for x in $FTPSITES
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do
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do
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# requests on Control connection
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# requests on Control connection
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$IPT -A INPUT -p tcp ! --syn --sport 21 --dport $PORTSUSER -s $x -j ACCEPT
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ipalltables -A INPUT -p tcp ! --syn --sport 21 --dport $PORTSUSER -s $x -j ACCEPT
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# FTP port-mode on Data Connection
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# FTP port-mode on Data Connection
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$IPT -A INPUT -p tcp --sport 20 --dport $PORTSUSER -s $x -j ACCEPT
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ipalltables -A INPUT -p tcp --sport 20 --dport $PORTSUSER -s $x -j ACCEPT
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# FTP passive-mode on Data Connection
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# FTP passive-mode on Data Connection
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# WARNING, this allow all connections on TCP ports > 1024
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# WARNING, this allow all connections on TCP ports > 1024
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$IPT -A INPUT -p tcp ! --syn --sport $PORTSUSER --dport $PORTSUSER -s $x -j ACCEPT
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ipalltables -A INPUT -p tcp ! --syn --sport $PORTSUSER --dport $PORTSUSER -s $x -j ACCEPT
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done
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done
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# SSH authorizations
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# SSH authorizations
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for x in $SSHOK
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for x in $SSHOK
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do
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do
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$IPT -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
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ipalltables -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
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done
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done
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# SMTP authorizations
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# SMTP authorizations
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for x in $SMTPOK
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for addr in $SMTPOK
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do
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do
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$IPT -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $x -j ACCEPT
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check_addr $addr|while read ip; do
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$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $ip -j ACCEPT
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done
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done
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done
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# secure SMTP (TCP/465 et TCP/587) authorizations
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# secure SMTP (TCP/465 et TCP/587) authorizations
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for x in $SMTPSECUREOK
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for addr in $SMTPSECUREOK
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do
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do
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$IPT -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $x -j ACCEPT
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check_addr $addr|while read ip; do
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$IPT -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $x -j ACCEPT
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$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $ip -j ACCEPT
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$(ipxtables $ip) -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $ip -j ACCEPT
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done
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done
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done
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# NTP authorizations
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# NTP authorizations
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for x in $NTPOK
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for x in $NTPOK
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do
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do
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$IPT -A INPUT -p udp --sport 123 -s $x -j ACCEPT
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ipalltables -A INPUT -p udp --sport 123 -s $x -j ACCEPT
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$IPT -A OUTPUT -o $INT -p udp -d $x --dport 123 --match state --state NEW -j ACCEPT
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ipalltables -A OUTPUT -o $INT -p udp -d $x --dport 123 --match state --state NEW -j ACCEPT
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done
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done
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# Always allow ICMP
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# Always allow ICMP
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$IPT -A INPUT -p icmp -j ACCEPT
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ipalltables -A INPUT -p icmp -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p icmpv6 -j ACCEPT
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# IPTables policy
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# IPTables policy
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#################
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#################
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# by default DROP INPUT packets
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# by default DROP INPUT packets
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$IPT -P INPUT DROP
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ipalltables -P INPUT DROP
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[ "$IPV6" != "off" ] && $IPT6 -P INPUT DROP
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# by default, no FORWARING (deprecated for Virtual Machines)
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# by default, no FORWARING (deprecated for Virtual Machines)
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#echo 0 > /proc/sys/net/ipv4/ip_forward
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#echo 0 > /proc/sys/net/ipv4/ip_forward
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#$IPT -P FORWARD DROP
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#ipalltables -P FORWARD DROP
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#$IPT6 -P FORWARD DROP
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#ipalltables6 -P FORWARD DROP
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# by default allow OUTPUT packets... but drop UDP packets (see OUTPUTDROP to drop OUTPUT packets)
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# by default allow OUTPUT packets... but drop UDP packets (see OUTPUTDROP to drop OUTPUT packets)
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$IPT -P OUTPUT ACCEPT
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ipalltables -P OUTPUT ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -P OUTPUT ACCEPT
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ipalltables -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
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$IPT -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
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ipalltables -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
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||||||
$IPT -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
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ipalltables -A OUTPUT -p udp -j DROP
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||||||
$IPT -A OUTPUT -p udp -j DROP
|
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||||||
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp -j DROP
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trap - INT TERM EXIT
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trap - INT TERM EXIT
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@ -316,55 +359,47 @@ trap - INT TERM EXIT
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echo "Flush all rules and accept everything..."
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echo "Flush all rules and accept everything..."
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||||||
# Delete all rules
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# Delete all rules
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$IPT -F INPUT
|
ipalltables -F INPUT
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$IPT -F OUTPUT
|
ipalltables -F OUTPUT
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$IPT -F LOG_DROP
|
ipalltables -F LOG_DROP
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$IPT -F LOG_ACCEPT
|
ipalltables -F LOG_ACCEPT
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$IPT -F ONLYTRUSTED
|
ipalltables -F ONLYTRUSTED
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||||||
$IPT -F ONLYPRIVILEGIED
|
ipalltables -F ONLYPRIVILEGIED
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||||||
$IPT -F NEEDRESTRICT
|
ipalltables -F NEEDRESTRICT
|
||||||
$IPT -t nat -F
|
ipalltables -t nat -F
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||||||
$IPT -t mangle -F
|
ipalltables -t mangle -F
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||||||
[ "$IPV6" != "off" ] && $IPT6 -F INPUT
|
|
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[ "$IPV6" != "off" ] && $IPT6 -F OUTPUT
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|
||||||
|
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||||||
# Accept all
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# Accept all
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||||||
$IPT -P INPUT ACCEPT
|
ipalltables -P INPUT ACCEPT
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||||||
$IPT -P OUTPUT ACCEPT
|
ipalltables -P OUTPUT ACCEPT
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -P INPUT ACCEPT
|
#ipalltables -P FORWARD ACCEPT
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||||||
[ "$IPV6" != "off" ] && $IPT6 -P OUTPUT ACCEPT
|
#ipalltables -t nat -P PREROUTING ACCEPT
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||||||
#$IPT -P FORWARD ACCEPT
|
#ipalltables -t nat -P POSTROUTING ACCEPT
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||||||
#$IPT -t nat -P PREROUTING ACCEPT
|
|
||||||
#$IPT -t nat -P POSTROUTING ACCEPT
|
|
||||||
|
|
||||||
# Delete non-standard chains
|
# Delete non-standard chains
|
||||||
$IPT -X LOG_DROP
|
ipalltables -X LOG_DROP
|
||||||
$IPT -X LOG_ACCEPT
|
ipalltables -X LOG_ACCEPT
|
||||||
$IPT -X ONLYPRIVILEGIED
|
ipalltables -X ONLYPRIVILEGIED
|
||||||
$IPT -X ONLYTRUSTED
|
ipalltables -X ONLYTRUSTED
|
||||||
$IPT -X NEEDRESTRICT
|
ipalltables -X NEEDRESTRICT
|
||||||
|
|
||||||
echo "...flushing IPTables rules is now finish : OK"
|
echo "...flushing IPTables rules is now finish : OK"
|
||||||
;;
|
;;
|
||||||
|
|
||||||
status)
|
status)
|
||||||
|
|
||||||
$IPT -L -n -v --line-numbers
|
ipalltables -L -n -v --line-numbers
|
||||||
$IPT -t nat -L -n -v --line-numbers
|
ipalltables -t nat -L -n -v --line-numbers
|
||||||
$IPT -t mangle -L -n -v --line-numbers
|
ipalltables -t mangle -L -n -v --line-numbers
|
||||||
$IPT6 -L -n -v --line-numbers
|
|
||||||
$IPT6 -t mangle -L -n -v --line-numbers
|
|
||||||
;;
|
;;
|
||||||
|
|
||||||
reset)
|
reset)
|
||||||
|
|
||||||
echo "Reset all IPTables counters..."
|
echo "Reset all IPTables counters..."
|
||||||
|
|
||||||
$IPT -Z
|
ipalltables -Z
|
||||||
$IPT -t nat -Z
|
ipalltables -t nat -Z
|
||||||
$IPT -t mangle -Z
|
ipalltables -t mangle -Z
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -Z
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -t mangle -Z
|
|
||||||
|
|
||||||
echo "...reseting IPTables counters is now finish : OK"
|
echo "...reseting IPTables counters is now finish : OK"
|
||||||
;;
|
;;
|
||||||
|
|
|
@ -5,15 +5,12 @@
|
||||||
# Main interface
|
# Main interface
|
||||||
INT='eth0'
|
INT='eth0'
|
||||||
|
|
||||||
# IPv6
|
|
||||||
IPV6=on
|
|
||||||
|
|
||||||
# Trusted IPv4 local network
|
# Trusted IPv4 local network
|
||||||
# ...will be often IP/32 if you don't trust anything
|
# ...will be often IP/32 if you don't trust anything
|
||||||
INTLAN='192.168.0.2/32'
|
INTLAN='192.168.0.2/32'
|
||||||
|
|
||||||
# Trusted IPv4 addresses for private and semi-public services
|
# Trusted IPv4 addresses for private and semi-public services
|
||||||
TRUSTEDIPS='62.212.121.90 88.179.18.233 31.170.8.4 31.170.9.129'
|
TRUSTEDIPS='62.212.121.90 88.179.18.233 31.170.8.4 31.170.9.129 2a01:9500:37:129::/64'
|
||||||
|
|
||||||
# Privilegied IPv4 addresses for semi-public services
|
# Privilegied IPv4 addresses for semi-public services
|
||||||
# (no need to add again TRUSTEDIPS)
|
# (no need to add again TRUSTEDIPS)
|
||||||
|
|
Loading…
Reference in a new issue