Extract main functions
This commit is contained in:
parent
c48534146a
commit
72e3729a78
636
minifirewall
636
minifirewall
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@ -51,13 +51,6 @@ BROAD='255.255.255.255'
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PORTSROOT='0:1023'
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PORTSROOT='0:1023'
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PORTSUSER='1024:65535'
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PORTSUSER='1024:65535'
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chain_exists()
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{
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local chain_name="$1" ; shift
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[ $# -eq 1 ] && local intable="--table $1"
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iptables $intable -nL "$chain_name" >/dev/null 2>&1
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}
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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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configfile="/etc/default/minifirewall"
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configfile="/etc/default/minifirewall"
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@ -67,76 +60,17 @@ IPV6=$(grep "IPV6=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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DOCKER=$(grep "DOCKER=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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DOCKER=$(grep "DOCKER=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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INT=$(grep "INT=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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INT=$(grep "INT=" /etc/default/minifirewall | awk -F '=' -F "'" '{print $2}')
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case "$1" in
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chain_exists()
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start)
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{
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local chain_name="$1" ; shift
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echo "Start IPTables rules..."
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[ $# -eq 1 ] && local intable="--table $1"
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iptables $intable -nL "$chain_name" >/dev/null 2>&1
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# Stop and warn if error!
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}
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set -e
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trap 'echo "ERROR in minifirewall configuration (fix it now!) or script manipulation (fix yourself)." ' INT TERM EXIT
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# sysctl network security settings
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##################################
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# Don't answer to broadcast pings
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echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
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# Ignore bogus ICMP responses
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echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
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# Disable Source Routing
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for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do
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echo 0 > $i
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done
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# Enable TCP SYN cookies to avoid TCP-SYN-FLOOD attacks
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# cf http://cr.yp.to/syncookies.html
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echo 1 > /proc/sys/net/ipv4/tcp_syncookies
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# Disable ICMP redirects
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for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do
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echo 0 > $i
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done
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for i in /proc/sys/net/ipv4/conf/*/send_redirects; do
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echo 0 > $i
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done
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# Enable Reverse Path filtering : verify if responses use same network interface
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for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
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echo 1 > $i
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done
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# log des paquets avec adresse incoherente
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for i in /proc/sys/net/ipv4/conf/*/log_martians; do
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echo 1 > $i
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done
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# IPTables configuration
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########################
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$IPT -N LOG_DROP
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$IPT -A LOG_DROP -j LOG --log-prefix '[IPTABLES DROP] : '
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$IPT -A LOG_DROP -j DROP
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$IPT -N LOG_ACCEPT
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$IPT -A LOG_ACCEPT -j LOG --log-prefix '[IPTABLES ACCEPT] : '
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$IPT -A LOG_ACCEPT -j ACCEPT
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if test -f $oldconfigfile; then
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echo "$oldconfigfile is deprecated, rename to $configfile" >&2
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exit 1
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fi
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if ! test -f $configfile; then
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echo "$configfile does not exist" >&2
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exit 1
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fi
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source_file_or_error() {
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source_file_or_error() {
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file=$1
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file=$1
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echo "...sourcing '${file}\`"
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echo "...sourcing '${file}\`"
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tmpfile=$(mktemp --tmpdir=/tmp minifirewall.XXX)
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tmpfile=$(mktemp --tmpdir=/tmp minifirewall.XXX)
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. ${file} 2>${tmpfile} >&2
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. ${file} 2>${tmpfile} >&2
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if [ -s ${tmpfile} ]; then
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if [ -s ${tmpfile} ]; then
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@ -146,280 +80,346 @@ source_file_or_error() {
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fi
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fi
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rm ${tmpfile}
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rm ${tmpfile}
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}
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}
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source_file_or_error ${configfile}
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if [ -d "${includesdir}" ]; then
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includefiles=$(find ${includesdir} -type f -readable -not -name '*.*')
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for includefile in ${includefiles}; do
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source_file_or_error "${includefile}"
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done
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fi
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# Trusted ip addresses
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start() {
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$IPT -N ONLYTRUSTED
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echo "Start IPTables rules..."
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$IPT -A ONLYTRUSTED -j LOG_DROP
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for x in $TRUSTEDIPS
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# Stop and warn if error!
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do
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set -e
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$IPT -I ONLYTRUSTED -s $x -j ACCEPT
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trap 'echo "ERROR in minifirewall configuration (fix it now!) or script manipulation (fix yourself)." ' INT TERM EXIT
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# sysctl network security settings
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##################################
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# Don't answer to broadcast pings
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echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
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# Ignore bogus ICMP responses
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echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses
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# Disable Source Routing
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for i in /proc/sys/net/ipv4/conf/*/accept_source_route; do
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echo 0 > $i
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done
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done
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# Privilegied ip addresses
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# Enable TCP SYN cookies to avoid TCP-SYN-FLOOD attacks
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# (trusted ip addresses *are* privilegied)
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# cf http://cr.yp.to/syncookies.html
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$IPT -N ONLYPRIVILEGIED
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echo 1 > /proc/sys/net/ipv4/tcp_syncookies
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$IPT -A ONLYPRIVILEGIED -j ONLYTRUSTED
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for x in $PRIVILEGIEDIPS
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# Disable ICMP redirects
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do
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for i in /proc/sys/net/ipv4/conf/*/accept_redirects; do
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$IPT -I ONLYPRIVILEGIED -s $x -j ACCEPT
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echo 0 > $i
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done
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done
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# Chain for restrictions (blacklist IPs/ranges)
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for i in /proc/sys/net/ipv4/conf/*/send_redirects; do
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$IPT -N NEEDRESTRICT
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echo 0 > $i
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# We allow all on loopback interface
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$IPT -A INPUT -i lo -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -i lo -j ACCEPT
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# if OUTPUTDROP
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$IPT -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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# attacked windowsupdate.com and DNS was changed to 127.0.0.1
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# $IPT -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
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$IPT -A INPUT -s $LOOPBACK ! -i lo -j DROP
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if [ "$DOCKER" = "on" ]; then
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$IPT -N MINIFW-DOCKER-TRUSTED
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$IPT -A MINIFW-DOCKER-TRUSTED -j DROP
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$IPT -N MINIFW-DOCKER-PRIVILEGED
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$IPT -A MINIFW-DOCKER-PRIVILEGED -j MINIFW-DOCKER-TRUSTED
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$IPT -A MINIFW-DOCKER-PRIVILEGED -j RETURN
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$IPT -N MINIFW-DOCKER-PUB
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$IPT -A MINIFW-DOCKER-PUB -j MINIFW-DOCKER-PRIVILEGED
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$IPT -A MINIFW-DOCKER-PUB -j RETURN
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# Flush DOCKER-USER if exist, create it if absent
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if chain_exists 'DOCKER-USER'; then
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$IPT -F DOCKER-USER
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else
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$IPT -N DOCKER-USER
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fi;
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# Pipe new connection through MINIFW-DOCKER-PUB
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$IPT -A DOCKER-USER -i $INT -m state --state NEW -j MINIFW-DOCKER-PUB
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$IPT -A DOCKER-USER -j RETURN
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fi
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# Local services restrictions
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#############################
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# Allow services for $INTLAN (local server or local network)
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$IPT -A INPUT -s $INTLAN -j ACCEPT
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# Enable protection chain for sensible services
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for x in $SERVICESTCP1p
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do
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$IPT -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 $SERVICESUDP1p
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# Enable Reverse Path filtering : verify if responses use same network interface
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do
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for i in /proc/sys/net/ipv4/conf/*/rp_filter; do
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$IPT -A INPUT -p udp --dport $x -j NEEDRESTRICT
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echo 1 > $i
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done
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done
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# Public service
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# log des paquets avec adresse incoherente
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for x in $SERVICESTCP1
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for i in /proc/sys/net/ipv4/conf/*/log_martians; do
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do
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echo 1 > $i
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$IPT -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 $SERVICESUDP1
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# IPTables configuration
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do
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########################
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$IPT -A INPUT -p udp --dport $x -j ACCEPT
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p udp --dport $x -j ACCEPT
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done
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# Privilegied services
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$IPT -N LOG_DROP
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for x in $SERVICESTCP2
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$IPT -A LOG_DROP -j LOG --log-prefix '[IPTABLES DROP] : '
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do
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$IPT -A LOG_DROP -j DROP
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$IPT -A INPUT -p tcp --dport $x -j ONLYPRIVILEGIED
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$IPT -N LOG_ACCEPT
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done
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$IPT -A LOG_ACCEPT -j LOG --log-prefix '[IPTABLES ACCEPT] : '
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$IPT -A LOG_ACCEPT -j ACCEPT
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for x in $SERVICESUDP2
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if test -f $oldconfigfile; then
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do
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echo "$oldconfigfile is deprecated, rename to $configfile" >&2
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$IPT -A INPUT -p udp --dport $x -j ONLYPRIVILEGIED
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exit 1
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done
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fi
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# Private services
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if ! test -f $configfile; then
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for x in $SERVICESTCP3
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echo "$configfile does not exist" >&2
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do
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exit 1
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$IPT -A INPUT -p tcp --dport $x -j ONLYTRUSTED
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fi
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done
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for x in $SERVICESUDP3
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source_file_or_error ${configfile}
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do
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$IPT -A INPUT -p udp --dport $x -j ONLYTRUSTED
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done
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if [ -d "${includesdir}" ]; then
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includefiles=$(find ${includesdir} -type f -readable -not -name '*.*')
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for includefile in ${includefiles}; do
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source_file_or_error "${includefile}"
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done
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fi
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if [ "$DOCKER" = "on" ]; then
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# Trusted ip addresses
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$IPT -N ONLYTRUSTED
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# Public services defined in SERVICESTCP1 & SERVICESUDP1
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$IPT -A ONLYTRUSTED -j LOG_DROP
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for dstport in $SERVICESTCP1
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for x in $TRUSTEDIPS
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do
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do
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$IPT -I MINIFW-DOCKER-PUB -p tcp --dport "$dstport" -j RETURN
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$IPT -I ONLYTRUSTED -s $x -j ACCEPT
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done
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done
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for dstport in $SERVICESUDP1
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# Privilegied ip addresses
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# (trusted ip addresses *are* privilegied)
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$IPT -N ONLYPRIVILEGIED
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$IPT -A ONLYPRIVILEGIED -j ONLYTRUSTED
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for x in $PRIVILEGIEDIPS
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do
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do
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$IPT -I MINIFW-DOCKER-PUB -p udp --dport "$dstport" -j RETURN
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$IPT -I ONLYPRIVILEGIED -s $x -j ACCEPT
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done
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done
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# Privileged services (accessible from privileged & trusted IPs)
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# Chain for restrictions (blacklist IPs/ranges)
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for dstport in $SERVICESTCP2
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$IPT -N NEEDRESTRICT
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do
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for srcip in $PRIVILEGIEDIPS
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do
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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done
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for srcip in $TRUSTEDIPS
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# We allow all on loopback interface
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do
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$IPT -A INPUT -i lo -j ACCEPT
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
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[ "$IPV6" != "off" ] && $IPT6 -A INPUT -i lo -j ACCEPT
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done
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# if OUTPUTDROP
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$IPT -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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# attacked windowsupdate.com and DNS was changed to 127.0.0.1
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# $IPT -t NAT -I PREROUTING -s $LOOPBACK -i ! lo -j DROP
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$IPT -A INPUT -s $LOOPBACK ! -i lo -j DROP
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if [ "$DOCKER" = "on" ]; then
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$IPT -N MINIFW-DOCKER-TRUSTED
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$IPT -A MINIFW-DOCKER-TRUSTED -j DROP
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$IPT -N MINIFW-DOCKER-PRIVILEGED
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$IPT -A MINIFW-DOCKER-PRIVILEGED -j MINIFW-DOCKER-TRUSTED
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$IPT -A MINIFW-DOCKER-PRIVILEGED -j RETURN
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$IPT -N MINIFW-DOCKER-PUB
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$IPT -A MINIFW-DOCKER-PUB -j MINIFW-DOCKER-PRIVILEGED
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$IPT -A MINIFW-DOCKER-PUB -j RETURN
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# Flush DOCKER-USER if exist, create it if absent
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if chain_exists 'DOCKER-USER'; then
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$IPT -F DOCKER-USER
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else
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$IPT -N DOCKER-USER
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fi;
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# Pipe new connection through MINIFW-DOCKER-PUB
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$IPT -A DOCKER-USER -i $INT -m state --state NEW -j MINIFW-DOCKER-PUB
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$IPT -A DOCKER-USER -j RETURN
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fi
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# Local services restrictions
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#############################
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||||||
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# Allow services for $INTLAN (local server or local network)
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$IPT -A INPUT -s $INTLAN -j ACCEPT
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# Enable protection chain for sensible services
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||||||
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for x in $SERVICESTCP1p
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do
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$IPT -A INPUT -p tcp --dport $x -j NEEDRESTRICT
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done
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done
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for dstport in $SERVICESUDP2
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for x in $SERVICESUDP1p
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do
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do
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for srcip in $PRIVILEGIEDIPS
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$IPT -A INPUT -p udp --dport $x -j NEEDRESTRICT
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do
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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done
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for srcip in $TRUSTEDIPS
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do
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$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
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done
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done
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done
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# Trusted services (accessible from trusted IPs)
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# Public service
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for dstport in $SERVICESTCP3
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for x in $SERVICESTCP1
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do
|
do
|
||||||
for srcip in $TRUSTEDIPS
|
$IPT -A INPUT -p tcp --dport $x -j ACCEPT
|
||||||
do
|
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p tcp --dport $x -j ACCEPT
|
||||||
$IPT -I MINIFW-DOCKER-TRUSTED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
|
|
||||||
done
|
|
||||||
done
|
done
|
||||||
|
|
||||||
for dstport in $SERVICESUDP3
|
for x in $SERVICESUDP1
|
||||||
do
|
do
|
||||||
for srcip in $TRUSTEDIPS
|
$IPT -A INPUT -p udp --dport $x -j ACCEPT
|
||||||
do
|
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p udp --dport $x -j ACCEPT
|
||||||
$IPT -I MINIFW-DOCKER-TRUSTED -p udp -s "$srcip" --dport "$dstport" -j RETURN
|
|
||||||
done
|
|
||||||
done
|
|
||||||
fi
|
|
||||||
|
|
||||||
# External services
|
|
||||||
###################
|
|
||||||
|
|
||||||
# DNS authorizations
|
|
||||||
for x in $DNSSERVEURS
|
|
||||||
do
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
$IPT -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
|
|
||||||
$IPT -A OUTPUT -o $INT -p udp -d $x --dport 53 --match state --state NEW -j ACCEPT
|
|
||||||
done
|
|
||||||
|
|
||||||
# HTTP (TCP/80) authorizations
|
|
||||||
for x in $HTTPSITES
|
|
||||||
do
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
done
|
|
||||||
|
|
||||||
# HTTPS (TCP/443) authorizations
|
|
||||||
for x in $HTTPSSITES
|
|
||||||
do
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
done
|
|
||||||
|
|
||||||
# FTP (so complex protocol...) authorizations
|
|
||||||
for x in $FTPSITES
|
|
||||||
do
|
|
||||||
# requests on Control connection
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 21 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
# FTP port-mode on Data Connection
|
|
||||||
$IPT -A INPUT -p tcp --sport 20 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
# FTP passive-mode on Data Connection
|
|
||||||
# WARNING, this allow all connections on TCP ports > 1024
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport $PORTSUSER --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
done
|
|
||||||
|
|
||||||
# SSH authorizations
|
|
||||||
for x in $SSHOK
|
|
||||||
do
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
|
|
||||||
done
|
done
|
||||||
|
|
||||||
# SMTP authorizations
|
# Privilegied services
|
||||||
for x in $SMTPOK
|
for x in $SERVICESTCP2
|
||||||
do
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
done
|
|
||||||
|
|
||||||
# secure SMTP (TCP/465 et TCP/587) authorizations
|
|
||||||
for x in $SMTPSECUREOK
|
|
||||||
do
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
$IPT -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $x -j ACCEPT
|
|
||||||
done
|
|
||||||
|
|
||||||
# NTP authorizations
|
|
||||||
for x in $NTPOK
|
|
||||||
do
|
do
|
||||||
$IPT -A INPUT -p udp --sport 123 -s $x -j ACCEPT
|
$IPT -A INPUT -p tcp --dport $x -j ONLYPRIVILEGIED
|
||||||
$IPT -A OUTPUT -o $INT -p udp -d $x --dport 123 --match state --state NEW -j ACCEPT
|
|
||||||
done
|
done
|
||||||
|
|
||||||
# Always allow ICMP
|
for x in $SERVICESUDP2
|
||||||
$IPT -A INPUT -p icmp -j ACCEPT
|
do
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p icmpv6 -j ACCEPT
|
$IPT -A INPUT -p udp --dport $x -j ONLYPRIVILEGIED
|
||||||
|
done
|
||||||
|
|
||||||
|
# Private services
|
||||||
|
for x in $SERVICESTCP3
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p tcp --dport $x -j ONLYTRUSTED
|
||||||
|
done
|
||||||
|
|
||||||
|
for x in $SERVICESUDP3
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p udp --dport $x -j ONLYTRUSTED
|
||||||
|
done
|
||||||
|
|
||||||
|
|
||||||
# IPTables policy
|
if [ "$DOCKER" = "on" ]; then
|
||||||
#################
|
|
||||||
|
|
||||||
# by default DROP INPUT packets
|
# Public services defined in SERVICESTCP1 & SERVICESUDP1
|
||||||
$IPT -P INPUT DROP
|
for dstport in $SERVICESTCP1
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -P INPUT DROP
|
do
|
||||||
|
$IPT -I MINIFW-DOCKER-PUB -p tcp --dport "$dstport" -j RETURN
|
||||||
|
done
|
||||||
|
|
||||||
# by default, no FORWARING (deprecated for Virtual Machines)
|
for dstport in $SERVICESUDP1
|
||||||
#echo 0 > /proc/sys/net/ipv4/ip_forward
|
do
|
||||||
#$IPT -P FORWARD DROP
|
$IPT -I MINIFW-DOCKER-PUB -p udp --dport "$dstport" -j RETURN
|
||||||
#$IPT6 -P FORWARD DROP
|
done
|
||||||
|
|
||||||
# by default allow OUTPUT packets... but drop UDP packets (see OUTPUTDROP to drop OUTPUT packets)
|
# Privileged services (accessible from privileged & trusted IPs)
|
||||||
$IPT -P OUTPUT ACCEPT
|
for dstport in $SERVICESTCP2
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -P OUTPUT ACCEPT
|
do
|
||||||
$IPT -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
for srcip in $PRIVILEGIEDIPS
|
||||||
$IPT -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
do
|
||||||
$IPT -A OUTPUT -p udp -j DROP
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
done
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp -j DROP
|
|
||||||
|
|
||||||
trap - INT TERM EXIT
|
for srcip in $TRUSTEDIPS
|
||||||
|
do
|
||||||
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
|
||||||
|
done
|
||||||
|
done
|
||||||
|
|
||||||
|
for dstport in $SERVICESUDP2
|
||||||
|
do
|
||||||
|
for srcip in $PRIVILEGIEDIPS
|
||||||
|
do
|
||||||
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
|
||||||
|
done
|
||||||
|
|
||||||
|
for srcip in $TRUSTEDIPS
|
||||||
|
do
|
||||||
|
$IPT -I MINIFW-DOCKER-PRIVILEGED -p udp -s "$srcip" --dport "$dstport" -j RETURN
|
||||||
|
done
|
||||||
|
done
|
||||||
|
|
||||||
|
# Trusted services (accessible from trusted IPs)
|
||||||
|
for dstport in $SERVICESTCP3
|
||||||
|
do
|
||||||
|
for srcip in $TRUSTEDIPS
|
||||||
|
do
|
||||||
|
$IPT -I MINIFW-DOCKER-TRUSTED -p tcp -s "$srcip" --dport "$dstport" -j RETURN
|
||||||
|
done
|
||||||
|
done
|
||||||
|
|
||||||
|
for dstport in $SERVICESUDP3
|
||||||
|
do
|
||||||
|
for srcip in $TRUSTEDIPS
|
||||||
|
do
|
||||||
|
$IPT -I MINIFW-DOCKER-TRUSTED -p udp -s "$srcip" --dport "$dstport" -j RETURN
|
||||||
|
done
|
||||||
|
done
|
||||||
|
fi
|
||||||
|
|
||||||
|
# External services
|
||||||
|
###################
|
||||||
|
|
||||||
|
# DNS authorizations
|
||||||
|
for x in $DNSSERVEURS
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 53 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
$IPT -A INPUT -p udp --sport 53 --dport $PORTSUSER -s $x -m state --state ESTABLISHED,RELATED -j ACCEPT
|
||||||
|
$IPT -A OUTPUT -o $INT -p udp -d $x --dport 53 --match state --state NEW -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# HTTP (TCP/80) authorizations
|
||||||
|
for x in $HTTPSITES
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 80 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# HTTPS (TCP/443) authorizations
|
||||||
|
for x in $HTTPSSITES
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 443 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# FTP (so complex protocol...) authorizations
|
||||||
|
for x in $FTPSITES
|
||||||
|
do
|
||||||
|
# requests on Control connection
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 21 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
# FTP port-mode on Data Connection
|
||||||
|
$IPT -A INPUT -p tcp --sport 20 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
# FTP passive-mode on Data Connection
|
||||||
|
# WARNING, this allow all connections on TCP ports > 1024
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport $PORTSUSER --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# SSH authorizations
|
||||||
|
for x in $SSHOK
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 22 -s $x -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# SMTP authorizations
|
||||||
|
for x in $SMTPOK
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 25 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# secure SMTP (TCP/465 et TCP/587) authorizations
|
||||||
|
for x in $SMTPSECUREOK
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 465 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
$IPT -A INPUT -p tcp ! --syn --sport 587 --dport $PORTSUSER -s $x -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# NTP authorizations
|
||||||
|
for x in $NTPOK
|
||||||
|
do
|
||||||
|
$IPT -A INPUT -p udp --sport 123 -s $x -j ACCEPT
|
||||||
|
$IPT -A OUTPUT -o $INT -p udp -d $x --dport 123 --match state --state NEW -j ACCEPT
|
||||||
|
done
|
||||||
|
|
||||||
|
# Always allow ICMP
|
||||||
|
$IPT -A INPUT -p icmp -j ACCEPT
|
||||||
|
[ "$IPV6" != "off" ] && $IPT6 -A INPUT -p icmpv6 -j ACCEPT
|
||||||
|
|
||||||
|
|
||||||
|
# IPTables policy
|
||||||
|
#################
|
||||||
|
|
||||||
|
# by default DROP INPUT packets
|
||||||
|
$IPT -P INPUT DROP
|
||||||
|
[ "$IPV6" != "off" ] && $IPT6 -P INPUT DROP
|
||||||
|
|
||||||
|
# by default, no FORWARING (deprecated for Virtual Machines)
|
||||||
|
#echo 0 > /proc/sys/net/ipv4/ip_forward
|
||||||
|
#$IPT -P FORWARD DROP
|
||||||
|
#$IPT6 -P FORWARD DROP
|
||||||
|
|
||||||
|
# by default allow OUTPUT packets... but drop UDP packets (see OUTPUTDROP to drop OUTPUT packets)
|
||||||
|
$IPT -P OUTPUT ACCEPT
|
||||||
|
[ "$IPV6" != "off" ] && $IPT6 -P OUTPUT ACCEPT
|
||||||
|
$IPT -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
||||||
|
$IPT -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
||||||
|
$IPT -A OUTPUT -p udp -j DROP
|
||||||
|
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -o $INT -p udp --dport 33434:33523 --match state --state NEW -j ACCEPT
|
||||||
|
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp --match state --state ESTABLISHED,RELATED -j ACCEPT
|
||||||
|
[ "$IPV6" != "off" ] && $IPT6 -A OUTPUT -p udp -j DROP
|
||||||
|
|
||||||
|
trap - INT TERM EXIT
|
||||||
|
|
||||||
echo "...starting IPTables rules is now finish : OK"
|
echo "...starting IPTables rules is now finish : OK"
|
||||||
;;
|
}
|
||||||
|
|
||||||
stop)
|
|
||||||
|
|
||||||
|
stop() {
|
||||||
echo "Flush all rules and accept everything..."
|
echo "Flush all rules and accept everything..."
|
||||||
|
|
||||||
# Delete all rules
|
# Delete all rules
|
||||||
|
|
@ -465,19 +465,17 @@ trap - INT TERM EXIT
|
||||||
$IPT -X NEEDRESTRICT
|
$IPT -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
|
$IPT -L -n -v --line-numbers
|
||||||
$IPT -t nat -L -n -v --line-numbers
|
$IPT -t nat -L -n -v --line-numbers
|
||||||
$IPT -t mangle -L -n -v --line-numbers
|
$IPT -t mangle -L -n -v --line-numbers
|
||||||
$IPT6 -L -n -v --line-numbers
|
$IPT6 -L -n -v --line-numbers
|
||||||
$IPT6 -t mangle -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
|
$IPT -Z
|
||||||
|
|
@ -487,13 +485,29 @@ trap - INT TERM EXIT
|
||||||
[ "$IPV6" != "off" ] && $IPT6 -t mangle -Z
|
[ "$IPV6" != "off" ] && $IPT6 -t mangle -Z
|
||||||
|
|
||||||
echo "...reseting IPTables counters is now finish : OK"
|
echo "...reseting IPTables counters is now finish : OK"
|
||||||
;;
|
}
|
||||||
|
|
||||||
restart)
|
case "$1" in
|
||||||
|
start)
|
||||||
|
start
|
||||||
|
;;
|
||||||
|
|
||||||
$0 stop
|
stop)
|
||||||
$0 start
|
stop
|
||||||
;;
|
;;
|
||||||
|
|
||||||
|
status)
|
||||||
|
status
|
||||||
|
;;
|
||||||
|
|
||||||
|
reset)
|
||||||
|
reset
|
||||||
|
;;
|
||||||
|
|
||||||
|
restart)
|
||||||
|
stop
|
||||||
|
start
|
||||||
|
;;
|
||||||
|
|
||||||
*)
|
*)
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue