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872 richard 1 
#!/bin/bash
64 franck 2 
# $Id: alcasar-iptables.sh 1488 2014-11-16 23:10:57Z richard $
675 richard 3 
# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
1339 richard 4 
# This script writes the netfilter rules for ALCASAR
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# Rexy - 3abtux - CPN
6 
#
7 
# Reminders
1221 richard 8 
# There are four channels for log :
1294 richard 9 
#	1 tracability of the consultation equipment with The 'Netflow' kernel module (iptables target = NETFLOW);
1221 richard 10 
#	2 protection of ALCASAR with the Ulog group 1 (default group)
1294 richard 11 
#	3 SSH on ALCASAR with the Ulog group 2;
12 
#	4 extern access attempts on ALCASAR with the Ulog group 3.
1469 richard 13 
# The bootps/dhcp (67) port is always open on tun0/INTIF by coova
14 
CONF_FILE="/usr/local/etc/alcasar.conf"
15 
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=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
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private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
19 
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
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PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
1469 richard 21 
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
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PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
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dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`				# first public DNS server
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dns1=${dns1:=208.67.220.220}
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dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`				# second public DNS server
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dns2=${dns2:=208.67.222.222}
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DNSSERVERS="$dns1,$dns2"						# first and second DNS IP servers addresses
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PROTOCOLS_FILTERING=`grep ^PROTOCOLS_FILTERING= $CONF_FILE|cut -d"=" -f2`	# Network protocols filter (on/off)
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PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
1332 richard 30 
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1339 richard 31 
BL_IP_OSSI="/usr/local/share/iptables-bl/ossi"				# ossi categoty
1377 richard 32 
WL_IP_OSSI="/usr/local/share/ossi-ip-wl"				# ip of the whitelist
1393 richard 33 
DNSMASQ_WL_ENABLED="/usr/local/share/dnsmasq-wl-enabled"		# enabled domain names for the Whitelist
1364 richard 34 
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set
35 
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
1469 richard 36 
QOS=`grep ^QOS= $CONF_FILE|cut -d"=" -f2`				# QOS (on/off)
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QOS=${QOS:=off}
1469 richard 38 
SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
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SSH=${SSH:=off}
1469 richard 40 
SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
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SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
1469 richard 42 
LDAP=`grep ^LDAP= $CONF_FILE|cut -d"=" -f2`				# LDAP external server active (on/off)
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LDAP=${LDAP:=off}
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LDAP_IP=`grep ^LDAP_IP= $CONF_FILE|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
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LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
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EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`				# EXTernal InterFace
47 
INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2`				# INTernal InterFace
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TUNIF="tun0"								# listen device for chilli daemon
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IPTABLES="/sbin/iptables"
1339 richard 50 
IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
1364 richard 51 
SAVE_DIR="/etc/sysconfig"						# Saving path
1 root 52 
 
1364 richard 53 
# Sauvegarde des SET des utilisateurs connectés si ils existent
54 
# Saving SET of connected users if it exists
55 
ipset list no_filtering_set 1>/dev/null 2>&1
56 
if [ $? -eq 0 ];
57 
then
58 
	ipset save no_filtering_set > $TMP_users_set_save
59 
	ipset save havp_set >> $TMP_users_set_save
60 
	ipset save havp_bl_set >> $TMP_users_set_save
61 
	ipset save havp_wl_set >> $TMP_users_set_save
62 
fi
63 
 
1291 richard 64 
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 65 
modprobe ipt_NETFLOW destination=127.0.0.1:2055
66 
 
498 richard 67 
# Effacement des règles existantes
476 richard 68 
# Flush all existing rules
1 root 69 
$IPTABLES -F
70 
$IPTABLES -t nat -F
71 
$IPTABLES -t mangle -F
72 
$IPTABLES -F INPUT
73 
$IPTABLES -F FORWARD
74 
$IPTABLES -F OUTPUT
75 
 
498 richard 76 
# Suppression des chaines utilisateurs sur les tables filter et nat
77 
# Flush non default rules on filter and nat tables
78 
$IPTABLES -X
79 
$IPTABLES -t nat -X
80 
 
81 
# Stratégies par défaut
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# Default policies
1 root 83 
$IPTABLES -P INPUT DROP
84 
$IPTABLES -P FORWARD DROP
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$IPTABLES -P OUTPUT DROP
1 root 86 
$IPTABLES -t nat -P PREROUTING ACCEPT
87 
$IPTABLES -t nat -P POSTROUTING ACCEPT
88 
$IPTABLES -t nat -P OUTPUT ACCEPT
89 
 
1484 richard 90 
 
91 
#############################
92 
#          IPSET            #
93 
#############################
94 
 
1291 richard 95 
# destruction de tous les SET
1332 richard 96 
# destroy all SET
1291 richard 97 
ipset destroy
98 
 
1484 richard 99 
###### BL set  ###########
100 
# Calcul de la taille / Compute the length
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bl_set_length=$(($(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)+$(wc -l $BL_IP_OSSI | awk '{print $1}')))
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# Chargement / loading
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echo "create blacklist_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
104 
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
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do
1364 richard 106 
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 107 
done
1364 richard 108 
cat $BL_IP_OSSI >> $TMP_set_save
109 
ipset -! restore < $TMP_set_save
110 
rm -f $TMP_set_save
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# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 112 
for ip in $(cat $IP_REHABILITEES)
113 
do
114 
	ipset del blacklist_ip_blocked $ip
115 
done
116 
 
1484 richard 117 
###### WL set  ###########
118 
# Calcul de la taille / Compute the length
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wl_set_length=$(($(wc -l $DNSMASQ_WL_ENABLED/* | awk '{print $1}' | tail -n 1)*3))
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# Chargement Loading
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echo "create whitelist_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1377 richard 122 
cat $WL_IP_OSSI >> $TMP_set_save
1364 richard 123 
ipset -! restore < $TMP_set_save
124 
rm -f $TMP_set_save
125 
 
126 
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 127 
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 128 
if [ -e $TMP_users_set_save ];
129 
then
130 
	ipset -! restore < $TMP_users_set_save
131 
	rm -f $TMP_users_set_save
132 
else
133 
	ipset create no_filtering_set hash:net hashsize 1024
134 
	ipset create havp_set hash:net hashsize 1024
135 
	ipset create havp_bl_set hash:net hashsize 1024
136 
	ipset create havp_wl_set hash:net hashsize 1024
137 
fi
138 
 
472 richard 139 
#############################
783 richard 140 
#       PREROUTING          #
472 richard 141 
#############################
1453 franck 142 
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
143 
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 144 
#$IPTABLES -A PREROUTING -t mangle -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp -m tcp --dport 80 -m string --string 'GET http' --algo bm --from 50 --to 70 -j MARK --set-mark 10
1453 franck 145 
 
1486 richard 146 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
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# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 150 
 
1486 richard 151 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
152 
# Mark (and log) the 8090 direct attempts to REJECT them in INPUT rules
153 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
154 
 
1484 richard 155 
# Marquage des paquets qui tentent d'accéder directement au port udp 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
156 
# Mark the udp 54 direct attempts (DNS-blacklist) to REJECT them in INPUT rules
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
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1484 richard 159 
# Marquage des paquets qui tentent d'accéder directement au port udp 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
160 
# Mark the udp 55 direct attempts (DNS-whitelist) to REJECT them in INPUT rules
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
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1484 richard 163 
# Marquage des paquets qui tentent d'accéder directement au port udp 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
164 
# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules
1486 richard 165 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1472 richard 166 
 
1364 richard 167 
# havp_bl_set --> redirection vers le port 54
168 
# havp_bl_set --> redirect to port 54
169 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
1393 richard 170 
 
1364 richard 171 
# havp_wl_set --> redirection vers le port 55
172 
# havp_wl_set --> redirect to port 55
173 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 55
174 
 
1486 richard 175 
# Redirection des requêtes HTTP des IP de la blacklist vers ALCASAR (page 'accès interdit') pour le set havp_bl_set
1393 richard 176 
# Redirect outbound HTTP requests from blacklist IP to ALCASAR ('access denied' page) for the set havp_bl_set
1364 richard 177 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p tcp --dport http -j REDIRECT --to-port 80
178 
 
1486 richard 179 
# Resirection des requêtes HTTP vers les IP qui ne sont pas dans la WL. Redirection vers ALCASAR : page 'accès interdit'
1484 richard 180 
# Redirect outbound HTTP requests to IP which are not in the WL. Redirection to ALCASAR : 'access denied' paae
1393 richard 181 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -m set ! --match-set whitelist_ip_allowed dst -p tcp --dport http -j REDIRECT --to-port 80
182 
 
1484 richard 183 
# Journalisation des requètes HTTP sortante des usagers "BL" (seulement les paquets SYN) - Les autres protocoles sont journalisés en FORWARD par netflow
184 
# Log HTTP requests to Internet of "BL users" (only syn packets) - Other protocols are logged in FORWARD by netflow
185 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
1221 richard 186 
 
1486 richard 187 
# Redirection des requêtes HTTP sortantes des usagers "BL+antivirus" vers DansGuardian
1484 richard 188 
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
189 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
190 
 
1486 richard 191 
# Redirection des requêtes HTTP sortantes des usager "WL+antivirus" vers Tinyproxy
192 
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1484 richard 193 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
1364 richard 194 
 
783 richard 195 
# Redirection des requêtes NTP vers le serveur NTP local
196 
# Redirect NTP request in local NTP server
197 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
198 
 
472 richard 199 
#############################
783 richard 200 
#         INPUT             #
472 richard 201 
#############################
871 richard 202 
 
783 richard 203 
# Tout passe sur loopback
204 
# accept all on loopback
205 
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 206 
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 207 
 
208 
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
209 
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 210 
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
211 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
212 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
213 
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 214 
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 215 
 
871 richard 216 
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
217 
# Drop broadcast & multicast on EXTIF to avoid log
783 richard 218 
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 219 
 
783 richard 220 
# On autorise les retours de connexions légitimes par INPUT
221 
# Conntrack on INPUT
222 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 223 
 
1221 richard 224 
# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
1486 richard 225 
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 226 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 227 
 
783 richard 228 
# Autorisation des connexions légitimes à DansGuardian
229 
# Allow connections for DansGuardian
230 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 231 
 
1486 richard 232 
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
233 
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
234 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
235 
 
236 
# Autorisation des connexions légitimes vers tinyproxy
237 
# Allow connections to tinyproxy
238 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
239 
 
1472 richard 240 
# On interdit les connexions directes au port UDP 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
241 
# Deny direct connections on UDP 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 242 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
791 richard 243 
 
1472 richard 244 
# On interdit les connexions directes au port UDP 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
245 
# Deny direct connections on UDP 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 246 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
1364 richard 247 
 
1472 richard 248 
# On interdit les connexions directes au port UDP 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
249 
# Deny direct connections on UDP 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 250 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
1472 richard 251 
 
1364 richard 252 
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
253 
# Allow connections for DNSMASQ (with blacklist)
783 richard 254 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
255 
 
1364 richard 256 
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
257 
# Allow connections for DNSMASQ (with whitelist)
258 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
259 
 
1472 richard 260 
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
261 
# Allow connections for DNSMASQ (blackhole mode)
262 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
263 
 
783 richard 264 
# Accès direct aux services internes
265 
# Internal services access
1364 richard 266 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS non filtré # DNS without blacklist
786 richard 267 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
268 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
269 
$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
270 
$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
271 
$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
272 
$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
783 richard 273 
 
274 
# SSHD rules if activate
275 
if [ $SSH = on ]
520 richard 276 
	then
783 richard 277 
	$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"
278 
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1063 richard 279 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
1161 richard 280 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 281 
fi
783 richard 282 
 
283 
# Insertion de règles locales
284 
# Here, we add local rules (i.e. VPN from Internet)
285 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
286 
        . /usr/local/etc/alcasar-iptables-local.sh
287 
fi
288 
 
289 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
290 
# Deny and log on INPUT from the LAN
291 
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
292 
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
293 
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
294 
 
1393 richard 295 
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 296 
# Reject INTIF access (only when chilli is down)
297 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
298 
$IPTABLES -A INPUT -i $INTIF -j REJECT
299 
 
300 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
301 
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
302 
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
303 
 
304 
#############################
305 
#        FORWARD            #
306 
#############################
307 
 
1364 richard 308 
# Blocage des IPs du SET blacklist_ip_blocked pour le SET havp_bl_set
309 
# Deny IPs of the SET blacklist_ip_blocked for the set havp_bl_set
310 
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p icmp -j REJECT --reject-with icmp-port-unreachable
311 
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p udp -j REJECT --reject-with icmp-port-unreachable
312 
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p tcp -j REJECT --reject-with tcp-reset
313 
 
783 richard 314 
# Rejet des requêtes DNS vers Internet
315 
# Deny forward DNS
316 
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
317 
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
318 
 
815 richard 319 
# Autorisation des retours de connexions légitimes
320 
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 321 
 
1364 richard 322 
#  If protocols filter is activate
1488 richard 323 
if [ $PROTOCOLS_FILTERING = on ]; then
324 
	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
325 
	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
326 
	if [ $nb_uamallowed != "0" ]
327 
	then
328 
		while read ip_allowed_line
329 
		do
330 
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
331 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
332 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
333 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
334 
		done < /usr/local/etc/alcasar-uamallowed
335 
	fi
336 
	# Autorisation du HTTP et des protocoles non commentés
337 
	# Allow HTTP and non comment protocols
338 
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
339 
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NETFLOW
340 
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ACCEPT
341 
	while read svc_line
342 
	do
343 
		svc_on=`echo $svc_line|cut -b1`
344 
		if [ $svc_on != "#" ]
345 
		then
346 
			svc_name=`echo $svc_line|cut -d" " -f1`
347 
			svc_port=`echo $svc_line|cut -d" " -f2`
348 
			if [ $svc_name = "icmp" ]
349 
			then
350 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
351 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT
352 
			else
492 franck 353 
 
1488 richard 354 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
355 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
356 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
357 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_UDP-$svc_name -- ACCEPT "
358 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
359 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
360 
			fi
361 
		fi
362 
	done < /usr/local/etc/alcasar-services
363 
	# Rejet explicite des autres protocoles
364 
	# reject the others protocols
365 
	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
366 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
367 
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
368 
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
369 
fi
370 
 
492 franck 371 
#  If QOS is activate  #
612 richard 372 
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 373 
	. /usr/local/etc/alcasar-iptables-qos.sh
374 
fi
375 
 
498 richard 376 
# Autorisation des connections sortant du LAN
476 richard 377 
# Allow forward connections with log
1221 richard 378 
#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
1159 crox53 379 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 380 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 381 
 
783 richard 382 
#############################
383 
#         OUTPUT            #
384 
#############################
1159 crox53 385 
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
386 
# Everything is allowed but traffic through outside network interface
498 richard 387 
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 388 
 
503 richard 389 
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 390 
# Allow DNS requests to identified DNS servers
391 
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 392 
 
615 richard 393 
# On autorise les requêtes HTTP sortantes
498 richard 394 
# HTTP requests are allowed
1159 crox53 395 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 396 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 397 
 
784 richard 398 
# On autorise les requêtes FTP
399 
# FTP requests are allowed
400 
modprobe ip_conntrack_ftp
401 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 402 
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 403 
 
615 richard 404 
# On autorise les requêtes NTP
498 richard 405 
# NTP requests are allowed
406 
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 407 
 
503 richard 408 
# On autorise les requêtes ICMP (ping)
409 
# ICMP (ping) requests are allowed
410 
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 411 
 
615 richard 412 
# On autorise les requêtes LDAP si un serveur externe est configué
413 
# LDAP requests are allowed if an external server is declared
414 
if [ $LDAP = on ]
415 
	then
694 franck 416 
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
417 
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 418 
fi
783 richard 419 
 
420 
#############################
421 
#       POSTROUTING         #
422 
#############################
498 richard 423 
# Traduction dynamique d'adresse en sortie
476 richard 424 
# Dynamic NAT on EXTIF
1 root 425 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
426 
 
476 richard 427 
# End of script
1 root 428