Subversion Repositories ALCASAR

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Ignore whitespace Rev 772 → Rev 783

/scripts/alcasar-iptables.sh
9,37 → 9,38
# 1 (default) for tracability;
# 2 for secure admin (ssh);
# 3 for exterior access attempts.
# The French Security Agency (ANSSI) rules was applied by 'alcasar.sh' script
# The French Security Agency (ANSSI) rules was applied by 'this script
# The bootps/dhcp (67) port is always open on tun0/eth1 by coova
 
conf_file="/usr/local/etc/alcasar.conf"
private_ip_mask=`grep PRIVATE_IP= $conf_file|cut -d"=" -f2`
private_ip_mask=${private_ip_mask:=192.168.182.1/24}
PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1` # ALCASAR LAN IP address
private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2` # LAN IP address (ie.: 192.168.182.0)
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2` # LAN prefix (ie. 24)
PRIVATE_NETWORK_MASK=$private_network/$private_prefix # Lan IP address + prefix (192.168.182.0/24)
public_ip_mask=`grep PUBLIC_IP= $conf_file|cut -d"=" -f2` # ALCASAR WAN IP address
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
dns1=`grep DNS1= $conf_file|cut -d"=" -f2` # first public DNS server
dns1=${dns1:=208.67.220.220}
dns2=`grep DNS2= $conf_file|cut -d"=" -f2` # second public DNS server
dns2=${dns2:=208.67.222.222}
DNSSERVERS="$dns1,$dns2" # first and second DNS IP servers addresses
PROTOCOLS_FILTERING=`grep PROTOCOLS_FILTERING= $conf_file|cut -d"=" -f2` # Network protocols filter (on/off)
PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
DNS_FILTERING=`grep DNS_FILTERING= $conf_file|cut -d"=" -f2` # DNS and URLs filter (on/off)
DNS_FILTERING=${DNS_FILTERING:=off}
QOS=`grep QOS= $conf_file|cut -d"=" -f2` # QOS (on/off)
QOS=`grep QOS= $conf_file|cut -d"=" -f2` # QOS (on/off)
QOS=${QOS:=off}
SSH=`grep SSH= $conf_file|cut -d"=" -f2` # sshd active (on/off)
SSH=`grep SSH= $conf_file|cut -d"=" -f2` # sshd active (on/off)
SSH=${SSH:=off}
Admin_from_IP=${Admin_from_IP:="0.0.0.0/0.0.0.0"} # Une @IP fixe peut-être fournie pour restreindre l'accès en ssh depuis l'extérieur (ex: 80.22.21.53/24) ( 0.0.0.0/0.0.0.0 = de n'importe où ! )
LDAP=`grep LDAP= $conf_file|cut -d"=" -f2` # ldap external server active (on/off)
Admin_from_IP=${Admin_from_IP:="0.0.0.0/0.0.0.0"} # WAN IP address to reduce ssh access (all ip allowed on LAN side)
LDAP=`grep LDAP= $conf_file|cut -d"=" -f2` # LDAP external server active (on/off)
LDAP=${LDAP:=off}
LDAP_IP=`grep LDAP_IP= $conf_file|cut -d"=" -f2` # ldap external server IP address
LDAP_IP=`grep LDAP_IP= $conf_file|cut -d"=" -f2` # WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
PRIVATE_NETWORK_MASK=$private_network/$private_prefix # Lan IP address + prefix (192.168.182.0/24)
PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1` # ALCASAR LAN IP address
DNSSERVERS="$dns1,$dns2" # first and second DNS IP servers addresses
EXTIF="eth0"
INTIF="eth1"
TUNIF="tun0" # listen card for chilli daemon
TUNIF="tun0" # listen device for chilli daemon
IPTABLES="/sbin/iptables"
 
# Effacement des règles existantes
65,23 → 66,56
$IPTABLES -t nat -P POSTROUTING ACCEPT
$IPTABLES -t nat -P OUTPUT ACCEPT
 
# Tout passe sur loopback
# accept all on loopback
$IPTABLES -A INPUT -i lo -j ACCEPT
 
#############################
# INTIF rules #
# PREROUTING #
#############################
# interdit l'accès à INTIF (n'est utile que lorsque chilli est arrêté).
# Reject INTIF access (only when chilli is down)
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
$IPTABLES -A INPUT -i $INTIF -j REJECT
# Marquage (et journalisation) des paquets qui tentent d'accéder directement à DansGuardian pour pouvoir les rejeter en INPUT
# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port udp 54 pour pouvoir les rejeter en INPUT
# Mark (and log) the udp 54 direct attempts to REJECT them in INPUT rules
# Remarque : Ce port n'est ouvert que lorsque le filtrage est activé
# Remark : this port is only open when filtering is on
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP -m udp --dport 54 -j ULOG --ulog-prefix "RULE DNS-proxy -- DENY "
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 2
 
# Si le filtrage est activé, redirection des flux DNS vers le port 54 (dns+blackhole) sauf pour les IP en exceptions
# If DNS filter is on, redirect DNS request to udp 54 (dns+blackhole) except for exception IP addresses
if [ $DNS_FILTERING = on ]; then
# Compute exception IP
nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
if [ $nb_exceptions != "0" ]
then
while read ip_exception
do
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -s $ip_exception -d $PRIVATE_IP --dport domain -j ACCEPT
done < /usr/local/etc/alcasar-filter-exceptions
fi
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
fi
 
# Journalisation des requètes HTTP vers Internet (seulement les paquets SYN) - Les autres protocoles sont journalisés en FORWARD
# Log HTTP requests to Internet (only syn packets) - Other protocols are log in FORWARD
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
# Redirection des requêtes HTTP vers DansGuardian (proxy transparent)
# Redirect HTTP requests in DansGuardian (transparent proxy)
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
 
# Redirection des requêtes NTP vers le serveur NTP local
# Redirect NTP request in local NTP server
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
 
#############################
# Local protection rules #
# INPUT #
#############################
# On stoppe les demande de connexions non conformes (NullScan, XMAS (tous flags à 1), NEW not SYN, etc.)
# Drop non standard connexions (NULLscans, XMAS, "NEW not SYN", etc.)
# Tout passe sur loopback
# accept all on loopback
$IPTABLES -A INPUT -i lo -j ACCEPT
 
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
88,38 → 122,81
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
 
# On ne traite pas les broadcasts et multicast
# Drop broadcast & multicast
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
# On rejète les trame en broadcast et en multicast sur EXTIF (pour ne pas les journaliser)
# Drop broadcast & multicast on EXTIF to not be logged
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
 
# Rejet des tentatives de création de tunnels DNS (même pour les utilisateurs authentifiés)
# Deny forward DNS (even for authenticated users ...)
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
# On autorise les retours de connexions légitimes par INPUT
# Conntrack on INPUT
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
 
# On autorise les retours de connexions légitimes par FORWARD
# Conntrack on forward
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on DansGuardian port (8080). The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
# Autorisation des connexions légitimes à DansGuardian
# Allow connections for DansGuardian
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
 
###############################
# If DNS filter is activate #
###############################
# Redirection des flux DNS vers le port 54 (dns+blackhole) sauf pour les IP en exceptions
if [ $DNS_FILTERING = on ]; then
# Compute exception IP
nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
if [ $nb_exceptions != "0" ]
# On interdit les connexions directes au port UDP 54. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
# Deny direct connections on UDP 54. The concerned paquets are marked in mangle table (PREROUTING)
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 2 -j REJECT --reject-with icmp-port-unreachable
# autorisation des connexion légitime à DNSMASQ (avec blackhole)
# Allow connections for DNSMASQ (with blackhole)
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
 
# Accès direct aux services internes
# Internal services access
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT # DNS non filtré # DNS without blackhole
#$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT # Requête ping # ping request
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT # Réponse ping # ping reply
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport https -j ACCEPT # Pages d'authentification et MCC # authentication pages and MCC
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport http -j ACCEPT # Page d'avertissement filtrage # Filtering warning pages
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 3990 -j ACCEPT # Requêtes de deconnexion usagers # Users logout requests
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT # Serveur local de temps # local time server
 
# SSHD rules if activate
if [ $SSH = on ]
then
while read ip_exception
do
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -s $ip_exception -d $PRIVATE_IP --dport domain -j ACCEPT
done < /usr/local/etc/alcasar-filter-exceptions
fi
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP --dport domain -j REDIRECT --to-port 54
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
$IPTABLES -A INPUT -i $EXTIF -s $Admin_from_IP -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
$IPTABLES -A INPUT -i $EXTIF -s $Admin_from_IP -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW,ESTABLISHED -j ACCEPT
fi
#####################################
# If protocols filter is activate #
#####################################
 
# Insertion de règles locales
# Here, we add local rules (i.e. VPN from Internet)
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
. /usr/local/etc/alcasar-iptables-local.sh
fi
 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
# Deny and log on INPUT from the LAN
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
 
# interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
# Reject INTIF access (only when chilli is down)
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
$IPTABLES -A INPUT -i $INTIF -j REJECT
 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
 
#############################
# FORWARD #
#############################
# Autorisation des retours de connexions légitimes
# Allow conntrack
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
 
# Rejet des requêtes DNS vers Internet
# Deny forward DNS
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
 
# If protocols filter is activate
if [ $PROTOCOLS_FILTERING = on ]; then
# Compute exception IP (IP addresses that shouldn't be filtered)
nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
155,14 → 232,16
then
$IPTABLES -A FORWARD -i $TUNIF -p icmp -j ACCEPT
else
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_$svc_name -- ACCEPT "
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_UDP-$svc_name -- ACCEPT "
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport $svc_port -m state --state NEW -j ACCEPT
fi
fi
done < /usr/local/etc/alcasar-services
# Rejet explicite (vers le LAN) des autres protocoles
# reject the others
$IPTABLES -A FORWARD -i $TUNIF -p tcp -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
# Rejet explicite des autres protocoles
# reject the others protocols
$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
180,75 → 259,14
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ACCEPT
 
#################################################################################################
# Direct input from local network (icmp, dns, ntp, https, http, ssh and 3990 (user disconnect) #
#################################################################################################
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT # ping reply
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT # ping request
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT # dnsmasq without forward
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT # dnsmasq with blackhole
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport https -j ACCEPT
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport http -j ACCEPT
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport 3990 -j ACCEPT
#############################
# OUTPUT #
#############################
# SSHD rules if activate
if [ $SSH = on ]
then
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport ssh -s $Admin_from_IP -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport ssh -s $Admin_from_IP -m state --state NEW,ESTABLISHED -j ACCEPT
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport ssh -m state --state ESTABLISHED -j ACCEPT
fi
 
# Insertion de règles locales
# Here, we add local rules (i.e. VPN from Internet)
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
. /usr/local/etc/alcasar-iptables-local.sh
fi
 
# On autorise les retours de connexions légitimes par INPUT
# Conntrack on INPUT
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
 
# On interdit les connexions directes au port utilisé par DansGuardian (8080)
# Les packets concernés ont fait l'objet d'un marquage dans la table mangle
# lors d'une règle de PREROUTING (voir plus bas)
# Deny direct connections on DansGuardian port (8080)
# The concerned paquets are marked by a pre-routing rule (see further)
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
# Autorisation des connexions à DansGuardian
# Allow connections for DansGuardian
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
 
# Journalisation des requètes HTTP (seulement des paquets SYN)
# Log HTTP requests (only syn)
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
# On redirige les requêtes HTTP vers DansGuardian (transparent pour les utilisateurs)
# Redirect HTTP request in DansGuardian (transparent proxy)
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -j REDIRECT --to-port 8080
# Journalisation et marquage des paquets qui tentent d'accéder directement à DansGuardian
# pour pouvoir les supprimer en INPUT (voir plus haut)
# Mark the dansguardian bypass attempts
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j MARK --set-mark 1
# On redirige les requêtes NTP vers le serveur NTP local
# Redirect NTP request in local NTP server
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp ! -d $PRIVATE_IP --dport ntp -j REDIRECT --to-port 123
 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
# Deny and log on INPUT from the LAN
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
 
#############################
# filtering outside OUTPUT. #
#############################
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
# Everything is allowed but traffic through outside network interface
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
256,15 → 274,19
# On autorise les requêtes DNS vers les serveurs DNS identifiés
# Allow DNS requests to identified DNS servers
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
 
# On autorise les requêtes HTTP sortantes
# HTTP requests are allowed
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
 
# On autorise les requêtes NTP
# NTP requests are allowed
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
 
# On autorise les requêtes ICMP (ping)
# ICMP (ping) requests are allowed
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
 
# On autorise les requêtes LDAP si un serveur externe est configué
# LDAP requests are allowed if an external server is declared
if [ $LDAP = on ]
274,6 → 296,11
# $IPTABLES -A INPUT -p tcp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
# $IPTABLES -A INPUT -p udp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
fi
 
 
#############################
# POSTROUTING #
#############################
# Traduction dynamique d'adresse en sortie
# Dynamic NAT on EXTIF
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
/scripts/alcasar-watchdog.sh
23,11 → 23,10
OLDIFS=$IFS
IFS=$'\n'
 
# Fonction appelée si un Pb de connectivité Internet
# On fait pointer les usagers sur l'adresse locale
function ext_down_alert ()
function lan_down_alert ()
# users are redirected on ALCASAR IP address if LAN Pb detected
{
case $EXT_DOWN in
case $LAN_DOWN in
"1")
logger "eth0 link down"
/bin/sed -i "s?diagnostic =.*?diagnostic = \"eth0 link down\";?g" $Index_Page
36,10 → 35,6
logger "can't contact the default router"
/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't contact the default router\";?g" $Index_Page
;;
"3")
logger "can't contact the Internet DNS"
/bin/sed -i "s?diagnostic =.*?diagnostic = \"can't contact the Internet DNS\";?g" $Index_Page
;;
esac
net_pb=`cat /etc/dnsmasq.conf|grep "address=/#/"|wc -l`
if [ $net_pb = "0" ] # on alerte les usagers (si ce n'est pas déjà le cas).
51,76 → 46,92
fi
}
 
# On teste la connectivité réseau
# On teste l'état d'EXTIF
EXT_DOWN="0"
if [ "`/usr/sbin/ethtool $EXTIF|grep Link|cut -d' ' -f3`" != "yes" ]
then
EXT_DOWN="1"
fi
# si EXTIF ok, on teste la connectivité vers le routeur par défaut (Box FAI)
if [ $EXT_DOWN -eq "0" ]
then
IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
if [ $arp_reply -eq "0" ]
then
EXT_DOWN="2"
function lan_test ()
# LAN connectiivity testing
{
# EXTIF testing
LAN_DOWN="0"
if [ "`/usr/sbin/ethtool $EXTIF|grep Link|cut -d' ' -f3`" != "yes" ]
then
LAN_DOWN="1"
fi
fi
# si routeur OK, on teste la connectivité vers les DNS externes
# + tard (EXT_DOWN=3)
# si Pb réseau, on avertit les usagers
if [ $EXT_DOWN != "0" ]
then
ext_down_alert
else
# sinon, le cas échéant, on rebascule en mode normal
net_pb=`cat /etc/dnsmasq.conf|grep "address=/#/"|wc -l`
if [ $net_pb != "0" ]
# Default GW testing
if [ $LAN_DOWN -eq "0" ]
then
/bin/sed -i "s?^\$network_pb.*?\$network_pb = False;?g" $Index_Page
/bin/sed -i "s?^address=\/#\/.*?conf-dir=/usr/local/etc/alcasar-dnsfilter-enabled?g" /etc/dnsmasq-blackhole.conf
/bin/sed -i "/^address=/d" /etc/dnsmasq.conf
/etc/init.d/dnsmasq restart
IP_GW=`/sbin/ip route list|grep ^default|cut -d" " -f3`
arp_reply=`/usr/sbin/arping -I$EXTIF -c1 $IP_GW|grep response|cut -d" " -f2`
if [ $arp_reply -eq "0" ]
then
LAN_DOWN="2"
fi
fi
fi
# if LAN pb detected, users are warned
if [ $LAN_DOWN != "0" ]
then
lan_down_alert
# else switch in normal mode
else
net_pb=`cat /etc/dnsmasq.conf|grep "address=/#/"|wc -l`
if [ $net_pb != "0" ]
then
/bin/sed -i "s?^\$network_pb.*?\$network_pb = False;?g" $Index_Page
/bin/sed -i "s?^address=\/#\/.*?conf-dir=/usr/local/etc/alcasar-dnsfilter-enabled?g" /etc/dnsmasq-blackhole.conf
/bin/sed -i "/^address=/d" /etc/dnsmasq.conf
/etc/init.d/dnsmasq restart
fi
fi
}
 
usage="Usage: alcasar-watchdog.sh {-lt --lan_test}"
case $1 in
-\? | -h* | --h*)
echo "$usage"
exit 0
;;
-lt | --lan_test)
lan_test
exit 0
;;
*)
lan_test
# lecture du fichier contenant les adresses IP des stations muettes
if [ -e $tmp_file ]; then
cat $tmp_file | while read noresponse
do
noresponse_ip=`echo $noresponse | cut -d" " -f1`
noresponse_mac=`echo $noresponse | cut -d" " -f2`
arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $noresponse_ip|grep response|cut -d" " -f2`
if [[ $(expr $arp_reply) -eq 0 ]]
then
logger "alcasar-watchdog $noresponse_ip ($noresponse_mac) can't be contact. Alcasar disconnects the user."
/usr/sbin/chilli_query logout $noresponse_mac
if [ -e $tmp_file ]; then
cat $tmp_file | while read noresponse
do
noresponse_ip=`echo $noresponse | cut -d" " -f1`
noresponse_mac=`echo $noresponse | cut -d" " -f2`
arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c1 -w4 $noresponse_ip|grep response|cut -d" " -f2`
if [[ $(expr $arp_reply) -eq 0 ]]
then
logger "alcasar-watchdog $noresponse_ip ($noresponse_mac) can't be contact. Alcasar disconnects the user."
/usr/sbin/chilli_query logout $noresponse_mac
fi
done
rm $tmp_file
fi
done
rm $tmp_file
fi
# on traite chaque équipements connus de chilli
for system in `/usr/sbin/chilli_query list |grep -v "\.0\.0\.0"`
do
active_ip=`echo $system |cut -d" " -f2`
active_session=`echo $system |cut -d" " -f5`
active_mac=`echo $system | cut -d" " -f1`
for system in `/usr/sbin/chilli_query list |grep -v "\.0\.0\.0"`
do
active_ip=`echo $system |cut -d" " -f2`
active_session=`echo $system |cut -d" " -f5`
active_mac=`echo $system | cut -d" " -f1`
# on ne traite que les équipements exploitées par un usager authentifié (test de 2 réponses en 4 secondes)
if [[ $(expr $active_session) -eq 1 ]]
then
arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep "Unicast reply"|wc -l`
if [[ $(expr $active_session) -eq 1 ]]
then
arp_reply=`/usr/sbin/arping -b -I$INTIF -s$PRIVATE_IP -c2 -w4 $active_ip|grep "Unicast reply"|wc -l`
# on stocke les adresses IP des stations muettes
if [[ $(expr $arp_reply) -eq 0 ]]
then
echo "$active_ip $active_mac" >> $tmp_file
fi
if [[ $(expr $arp_reply) -eq 0 ]]
then
echo "$active_ip $active_mac" >> $tmp_file
fi
# on deconnecte l'usager d'une stations usurpée (@MAC)
if [[ $(expr $arp_reply) -gt 2 ]]
then
logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user."
/usr/sbin/chilli_query logout $active_mac
fi
fi
done
if [[ $(expr $arp_reply) -gt 2 ]]
then
logger "alcasar-watchdog : $active_ip is usurped ($active_mac). Alcasar disconnect the user."
/usr/sbin/chilli_query logout $active_mac
fi
fi
done
;;
esac
IFS=$OLDIFS