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#!/bin/bash
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#!/bin/bash
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# $Id: alcasar-watchdog.sh 2113 2017-01-08 22:43:26Z richard $
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# $Id: alcasar-watchdog.sh 2250 2017-05-22 22:00:03Z tom.houdayer $
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# alcasar-watchdog.sh
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# alcasar-watchdog.sh
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# by Rexy
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# by Rexy
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# This script is distributed under the Gnu General Public License (GPL)
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# This script is distributed under the Gnu General Public License (GPL)
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# - Ce script prévient les usagers de l'indisponibilité de l'accès Internet
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# - Ce script prévient les usagers de l'indisponibilité de l'accès Internet
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# - Il déconnecte les usagers dont les équipements réseau ne répondent plus (leur onglet 'status.php' a été fermé)
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# - Il déconnecte les usagers dont les équipements réseau ne répondent plus (leur onglet 'status.php' a été fermé)
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# - Il deconnecte les usagers dont les adresses MAC sont usurpées
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# - Il deconnecte les usagers dont les adresses MAC sont usurpées
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#
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#
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# - This script tells users that Internet access is down
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# - This script tells users that Internet access is down
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# - It logs out users whose PCs are quiet (their status tab is closed)
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# - It logs out users whose PCs are quiet (their status tab is closed)
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# - It logs out users whose MAC address is used by other systems (usurped)
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# - It logs out users whose MAC address is used by other systems (usurped)
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CONF_FILE="/usr/local/etc/alcasar.conf"
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CONF_FILE="/usr/local/etc/alcasar.conf"
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EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2` # EXTernal InterFace
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EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2` # EXTernal InterFace
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INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2` # INTernal InterFace
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INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2` # INTernal InterFace
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private_ip_mask=`grep PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
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private_ip_mask=`grep PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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PRIVATE_IP=`echo "$private_ip_mask" |cut -d"/" -f1` # @ip du portail (côté LAN)
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PRIVATE_IP=`echo "$private_ip_mask" |cut -d"/" -f1` # @ip du portail (côté LAN)
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PRIVATE_IP=${PRIVATE_IP:=192.168.182.1}
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PRIVATE_IP=${PRIVATE_IP:=192.168.182.1}
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current_users_file="/var/tmp/havp/current_users.txt" # file containing active users with their "status.php" tab open
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current_users_file="/var/tmp/havp/current_users.txt" # file containing active users with their "status.php" tab open
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DIR_WEB="/var/www/html"
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DIR_WEB="/var/www/html"
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Index_Page="$DIR_WEB/index.php"
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Index_Page="$DIR_WEB/index.php"
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IPTABLES="/sbin/iptables"
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IPTABLES="/sbin/iptables"
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TUNIF="tun0" # listen device for chilli daemon
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TUNIF="tun0" # listen device for chilli daemon
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OLDIFS=$IFS
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OLDIFS=$IFS
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IFS=$'\n'
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IFS=$'\n'
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function lan_down_alert ()
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function lan_down_alert ()
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# users are redirected on ALCASAR IP address if a LAN problem is detected
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# users are redirected on ALCASAR IP address if a LAN problem is detected
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{
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{
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case $LAN_DOWN in
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case $LAN_DOWN in
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"1")
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"1")
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logger "$EXTIF (WAN card) link down"
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logger "$EXTIF (WAN card) link down"
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echo "$EXTIF (WAN card) link down"
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echo "$EXTIF (WAN card) link down"
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/bin/sed -i "s?diagnostic =.*?diagnostic = \"$EXTIF (WAN card) link down\";?g" $Index_Page
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/bin/sed -i "s?diagnostic =.*?diagnostic = \"$EXTIF (WAN card) link down\";?g" $Index_Page
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;;
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;;
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"2")
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"2")
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logger "can't contact the default router"
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logger "can't contact the default router"
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echo "can't contact the default router"
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echo "can't contact the default router"
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/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't contact the default router\";?g" $Index_Page
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/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't contact the default router\";?g" $Index_Page
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;;
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;;
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esac
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esac
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net_pb=`grep "network_pb = True;" $Index_Page|wc -l`
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net_pb=`grep "network_pb = true;" $Index_Page|wc -l`
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if [ $net_pb = "0" ] # user alert (only the first time)
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if [ $net_pb = "0" ] # user alert (only the first time)
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then
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then
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/bin/sed -i "s?^\$network_pb.*?\$network_pb = True;?g" $Index_Page
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/bin/sed -i "s?^\$network_pb.*?\$network_pb = true;?g" $Index_Page
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$IPTABLES -I PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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$IPTABLES -I PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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fi
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fi
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}
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}
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function lan_test ()
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function lan_test ()
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# LAN connectiivity testing
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# LAN connectiivity testing
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{
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{
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watchdog_process=`ps -C alcasar-watchdog.sh|wc -l`
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watchdog_process=`ps -C alcasar-watchdog.sh|wc -l`
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if [[ $(expr $watchdog_process) -gt 3 ]]
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if [[ $(expr $watchdog_process) -gt 3 ]]
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then
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then
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echo "ALCASAR watchdog is already running"
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echo "ALCASAR watchdog is already running"
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exit 0
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exit 0
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fi
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fi
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# EXTIF testing
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# EXTIF testing
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LAN_DOWN="0"
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LAN_DOWN="0"
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if [ `/sbin/ip link | grep $EXTIF|grep "NO-CARRIER" | wc -l` -eq "1" ]
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if [ `/sbin/ip link | grep $EXTIF|grep "NO-CARRIER" | wc -l` -eq "1" ]
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then
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then
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LAN_DOWN="1"
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LAN_DOWN="1"
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fi
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fi
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# Default GW testing
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# Default GW testing
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if [ $LAN_DOWN -eq "0" ]
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if [ $LAN_DOWN -eq "0" ]
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then
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then
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IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
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arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
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arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
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if [ $arp_reply -eq "0" ]
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if [ $arp_reply -eq "0" ]
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then
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then
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LAN_DOWN="2"
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LAN_DOWN="2"
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fi
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fi
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fi
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fi
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# if LAN pb detected, users are warned
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# if LAN pb detected, users are warned
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if [ $LAN_DOWN != "0" ]
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if [ $LAN_DOWN != "0" ]
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then
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then
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lan_down_alert
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lan_down_alert
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# else switch in normal mode
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# else switch in normal mode
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else
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else
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echo "Internet access is OK for now"
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echo "Internet access is OK for now"
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net_pb=`grep "network_pb = True;" $Index_Page|wc -l`
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net_pb=`grep "network_pb = true;" $Index_Page|wc -l`
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if [ $net_pb != "0" ]
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if [ $net_pb != "0" ]
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then
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then
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/bin/sed -i "s?^\$network_pb.*?\$network_pb = False;?g" $Index_Page
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/bin/sed -i "s?^\$network_pb.*?\$network_pb = false;?g" $Index_Page
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$IPTABLES -D PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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$IPTABLES -D PREROUTING -t nat -i $TUNIF -p udp --dport domain -j REDIRECT --to-port 56
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fi
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fi
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fi
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fi
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}
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}
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usage="Usage: alcasar-watchdog.sh {-lt --lan_test}"
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usage="Usage: alcasar-watchdog.sh {-lt --lan_test}"
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case $1 in
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case $1 in
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-\? | -h* | --h*)
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-\? | -h* | --h*)
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echo "$usage"
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echo "$usage"
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exit 0
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exit 0
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;;
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;;
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-lt | --lan_test)
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-lt | --lan_test)
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lan_test
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lan_test
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exit 0
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exit 0
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;;
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;;
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*)
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*)
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lan_test
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lan_test
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# We disconnect inactive users (its means that their 'status.php' tab has been closed --> their ip address isn't in $current_users_file)
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# We disconnect inactive users (its means that their 'status.php' tab has been closed --> their ip address isn't in $current_users_file)
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# process each equipment known by chilli to check if IP address is usurped (with arping)
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# process each equipment known by chilli to check if IP address is usurped (with arping)
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for system in `/usr/sbin/chilli_query list |grep -v "\.0\.0\.0"`
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for system in `/usr/sbin/chilli_query list |grep -v "\.0\.0\.0"`
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do
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do
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active_ip=`echo $system |cut -d" " -f2`
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active_ip=`echo $system |cut -d" " -f2`
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active_session=`echo $system |cut -d" " -f5`
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active_session=`echo $system |cut -d" " -f5`
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active_mac=`echo $system | cut -d" " -f1`
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active_mac=`echo $system | cut -d" " -f1`
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active_user=`echo $system |cut -d" " -f6`
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active_user=`echo $system |cut -d" " -f6`
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#We disconnect inactive user here :
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#We disconnect inactive user here :
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#We check if this is not an auth @MAC and if he is still connected
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#We check if this is not an auth @MAC and if he is still connected
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if [ "$active_user" != "$active_mac" ] && [ $(expr $active_session) -eq 1 ]; then
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if [ "$active_user" != "$active_mac" ] && [ $(expr $active_session) -eq 1 ]; then
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if [ -e $current_users_file ]; then
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if [ -e $current_users_file ]; then
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# We check if user @IP is in 'current_users.txt'
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# We check if user @IP is in 'current_users.txt'
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cmp_user_ok=$(cat $current_users_file | grep $active_ip | wc -w)
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cmp_user_ok=$(cat $current_users_file | grep $active_ip | wc -w)
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# If not we disconnect this user.
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# If not we disconnect this user.
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if [ $cmp_user_ok -eq 0 ]; then
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if [ $cmp_user_ok -eq 0 ]; then
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logger "alcasar-watchdog : $active_ip ($active_mac) can't be contact. We disconnects the user ($active_user)."
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logger "alcasar-watchdog : $active_ip ($active_mac) can't be contact. We disconnects the user ($active_user)."
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/usr/sbin/chilli_query logout $active_mac
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/usr/sbin/chilli_query logout $active_mac
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fi
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fi
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# Remove the user's IP from 'current_users.txt'. Every user need to insert their @IP everytime to prove their connectivity.
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# Remove the user's IP from 'current_users.txt'. Every user need to insert their @IP everytime to prove their connectivity.
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sed -i "/^$active_ip/d" $current_users_file
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sed -i "/^$active_ip/d" $current_users_file
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else # "/tmp/current_user.txt" does not exists. We disconnect every users.
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else # "/tmp/current_user.txt" does not exists. We disconnect every users.
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logger "alcasar-watchdog : The file /var/tmp/havp/current_users.txt doen't' exist. We disconnects the user $active_user"
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logger "alcasar-watchdog : The file /var/tmp/havp/current_users.txt doen't' exist. We disconnects the user $active_user"
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/usr/sbin/chilli_query logout $active_mac
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/usr/sbin/chilli_query logout $active_mac
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fi
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fi
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fi
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fi
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# IP usurpation test : process only equipment with an authenticated user
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# IP usurpation test : process only equipment with an authenticated user
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if [[ $(expr $active_session) -eq 1 ]]
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if [[ $(expr $active_session) -eq 1 ]]
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then
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then
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arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep "Unicast reply"|wc -l`
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arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep "Unicast reply"|wc -l`
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# disconnect users whose equipement is usurped. For example, if there are 2 same @MAC it will make 3 lines in output.
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# disconnect users whose equipement is usurped. For example, if there are 2 same @MAC it will make 3 lines in output.
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if [[ $(expr $arp_reply) -gt 2 ]]
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if [[ $(expr $arp_reply) -gt 2 ]]
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then
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then
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echo "$(date "+[%x-%X] : ")alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)." >> /var/Save/security/watchdog.log
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echo "$(date "+[%x-%X] : ")alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)." >> /var/Save/security/watchdog.log
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logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)."
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logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user ($active_user)."
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/usr/sbin/chilli_query logout $active_mac
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/usr/sbin/chilli_query logout $active_mac
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chmod 644 /var/Save/security/watchdog.log
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chmod 644 /var/Save/security/watchdog.log
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fi
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fi
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fi
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fi
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done
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done
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;;
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;;
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esac
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esac
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IFS=$OLDIFS
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IFS=$OLDIFS
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