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872 richard 1 
#!/bin/bash
64 franck 2 
# $Id: alcasar-iptables.sh 1588 2015-03-08 23:00:08Z 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 :
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#	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)
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#	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"
1587 richard 15 
EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`				# EXTernal InterFace
16 
INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2`				# INTernal InterFace
17 
TUNIF="tun0"								# listen device for chilli daemon
1469 richard 18 
private_ip_mask=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
615 richard 19 
private_ip_mask=${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)
22 
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
783 richard 23 
PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
1469 richard 24 
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
1585 richard 25 
if [[ "$public_ip_mask" == "dhcp" ]]
26 
then
27 
	PTN="\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\/([012]?[0-9]|3[0-2])\b"
1587 richard 28 
	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`
1585 richard 29 
fi
783 richard 30 
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
1588 richard 31 
dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`
32 
dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`
615 richard 33 
dns1=${dns1:=208.67.220.220}
34 
dns2=${dns2:=208.67.222.222}
1585 richard 35 
DNSSERVERS="$dns1,$dns2"						# first and second public DNS servers
1469 richard 36 
PROTOCOLS_FILTERING=`grep ^PROTOCOLS_FILTERING= $CONF_FILE|cut -d"=" -f2`	# Network protocols filter (on/off)
615 richard 37 
PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
1332 richard 38 
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1339 richard 39 
BL_IP_OSSI="/usr/local/share/iptables-bl/ossi"				# ossi categoty
1377 richard 40 
WL_IP_OSSI="/usr/local/share/ossi-ip-wl"				# ip of the whitelist
1393 richard 41 
DNSMASQ_WL_ENABLED="/usr/local/share/dnsmasq-wl-enabled"		# enabled domain names for the Whitelist
1364 richard 42 
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set
43 
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
1469 richard 44 
QOS=`grep ^QOS= $CONF_FILE|cut -d"=" -f2`				# QOS (on/off)
615 richard 45 
QOS=${QOS:=off}
1469 richard 46 
SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
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SSH=${SSH:=off}
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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 50 
LDAP=`grep ^LDAP= $CONF_FILE|cut -d"=" -f2`				# LDAP external server active (on/off)
615 richard 51 
LDAP=${LDAP:=off}
1469 richard 52 
LDAP_IP=`grep ^LDAP_IP= $CONF_FILE|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
768 richard 53 
LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
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IPTABLES="/sbin/iptables"
1339 richard 55 
IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
1364 richard 56 
SAVE_DIR="/etc/sysconfig"						# Saving path
1 root 57 
 
1364 richard 58 
# Sauvegarde des SET des utilisateurs connectés si ils existent
59 
# Saving SET of connected users if it exists
60 
ipset list no_filtering_set 1>/dev/null 2>&1
61 
if [ $? -eq 0 ];
62 
then
63 
	ipset save no_filtering_set > $TMP_users_set_save
64 
	ipset save havp_set >> $TMP_users_set_save
65 
	ipset save havp_bl_set >> $TMP_users_set_save
66 
	ipset save havp_wl_set >> $TMP_users_set_save
67 
fi
68 
 
1291 richard 69 
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 70 
modprobe ipt_NETFLOW destination=127.0.0.1:2055
71 
 
498 richard 72 
# Effacement des règles existantes
476 richard 73 
# Flush all existing rules
1 root 74 
$IPTABLES -F
75 
$IPTABLES -t nat -F
76 
$IPTABLES -t mangle -F
77 
$IPTABLES -F INPUT
78 
$IPTABLES -F FORWARD
79 
$IPTABLES -F OUTPUT
80 
 
498 richard 81 
# Suppression des chaines utilisateurs sur les tables filter et nat
82 
# Flush non default rules on filter and nat tables
83 
$IPTABLES -X
84 
$IPTABLES -t nat -X
85 
 
86 
# Stratégies par défaut
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# Default policies
1 root 88 
$IPTABLES -P INPUT DROP
89 
$IPTABLES -P FORWARD DROP
498 richard 90 
$IPTABLES -P OUTPUT DROP
1 root 91 
$IPTABLES -t nat -P PREROUTING ACCEPT
92 
$IPTABLES -t nat -P POSTROUTING ACCEPT
93 
$IPTABLES -t nat -P OUTPUT ACCEPT
94 
 
1484 richard 95 
 
96 
#############################
97 
#          IPSET            #
98 
#############################
99 
 
1291 richard 100 
# destruction de tous les SET
1332 richard 101 
# destroy all SET
1291 richard 102 
ipset destroy
103 
 
1484 richard 104 
###### BL set  ###########
105 
# Calcul de la taille / Compute the length
1393 richard 106 
bl_set_length=$(($(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)+$(wc -l $BL_IP_OSSI | awk '{print $1}')))
1484 richard 107 
# Chargement / loading
1393 richard 108 
echo "create blacklist_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
109 
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 110 
do
1364 richard 111 
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 112 
done
1364 richard 113 
cat $BL_IP_OSSI >> $TMP_set_save
114 
ipset -! restore < $TMP_set_save
115 
rm -f $TMP_set_save
1484 richard 116 
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 117 
for ip in $(cat $IP_REHABILITEES)
118 
do
119 
	ipset del blacklist_ip_blocked $ip
120 
done
121 
 
1484 richard 122 
###### WL set  ###########
123 
# Calcul de la taille / Compute the length
1393 richard 124 
wl_set_length=$(($(wc -l $DNSMASQ_WL_ENABLED/* | awk '{print $1}' | tail -n 1)*3))
1484 richard 125 
# Chargement Loading
1393 richard 126 
echo "create whitelist_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1377 richard 127 
cat $WL_IP_OSSI >> $TMP_set_save
1364 richard 128 
ipset -! restore < $TMP_set_save
129 
rm -f $TMP_set_save
130 
 
131 
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 132 
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 133 
if [ -e $TMP_users_set_save ];
134 
then
135 
	ipset -! restore < $TMP_users_set_save
136 
	rm -f $TMP_users_set_save
137 
else
138 
	ipset create no_filtering_set hash:net hashsize 1024
139 
	ipset create havp_set hash:net hashsize 1024
140 
	ipset create havp_bl_set hash:net hashsize 1024
141 
	ipset create havp_wl_set hash:net hashsize 1024
142 
fi
143 
 
472 richard 144 
#############################
783 richard 145 
#       PREROUTING          #
472 richard 146 
#############################
1453 franck 147 
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
148 
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 149 
#$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 150 
 
1486 richard 151 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
783 richard 152 
# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
1221 richard 153 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
783 richard 154 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 155 
 
1486 richard 156 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
157 
# Mark (and log) the 8090 direct attempts to REJECT them in INPUT rules
1544 richard 158 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8090 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
1486 richard 159 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
160 
 
1484 richard 161 
# Marquage des paquets qui tentent d'accéder directement au port udp 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
162 
# Mark the udp 54 direct attempts (DNS-blacklist) to REJECT them in INPUT rules
1486 richard 163 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
783 richard 164 
 
1484 richard 165 
# Marquage des paquets qui tentent d'accéder directement au port udp 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
166 
# Mark the udp 55 direct attempts (DNS-whitelist) to REJECT them in INPUT rules
1486 richard 167 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
783 richard 168 
 
1484 richard 169 
# Marquage des paquets qui tentent d'accéder directement au port udp 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
170 
# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules
1486 richard 171 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1472 richard 172 
 
1544 richard 173 
# redirection DNS des usagers 'havp_bl' vers le port 54
174 
# redirect DNS of 'havp_bl' users to port 54
1364 richard 175 
$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 176 
 
1544 richard 177 
# redirection DNS des usagers 'havp_wl' vers le port 55
178 
# redirect DNS of 'havp_bl' users to port 55
1364 richard 179 
$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
180 
 
1544 richard 181 
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
182 
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
183 
$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 "
184 
 
185 
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
186 
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1364 richard 187 
$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
188 
 
1544 richard 189 
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
190 
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1393 richard 191 
$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
192 
 
1544 richard 193 
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 194 
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
195 
$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
196 
 
1544 richard 197 
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 198 
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1484 richard 199 
$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
1544 richard 200 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
1364 richard 201 
 
783 richard 202 
# Redirection des requêtes NTP vers le serveur NTP local
203 
# Redirect NTP request in local NTP server
204 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
205 
 
472 richard 206 
#############################
783 richard 207 
#         INPUT             #
472 richard 208 
#############################
871 richard 209 
 
783 richard 210 
# Tout passe sur loopback
211 
# accept all on loopback
212 
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 213 
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 214 
 
215 
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
216 
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 217 
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
218 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
219 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
220 
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 221 
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 222 
 
1587 richard 223 
# Si configéré, on autorise les réponses DHCP
224 
# Allow DHCP answers if configured
225 
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
226 
if [[ "$public_ip_mask" == "dhcp" ]]
227 
then
228 
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
229 
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
230 
fi
871 richard 231 
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
232 
# Drop broadcast & multicast on EXTIF to avoid log
783 richard 233 
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 234 
 
783 richard 235 
# On autorise les retours de connexions légitimes par INPUT
236 
# Conntrack on INPUT
237 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 238 
 
1221 richard 239 
# 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 240 
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 241 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 242 
 
783 richard 243 
# Autorisation des connexions légitimes à DansGuardian
244 
# Allow connections for DansGuardian
245 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 246 
 
1486 richard 247 
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
248 
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
249 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
250 
 
251 
# Autorisation des connexions légitimes vers tinyproxy
252 
# Allow connections to tinyproxy
253 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
254 
 
1472 richard 255 
# On interdit les connexions directes au port UDP 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
256 
# Deny direct connections on UDP 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 257 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
791 richard 258 
 
1472 richard 259 
# On interdit les connexions directes au port UDP 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
260 
# Deny direct connections on UDP 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 261 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
1364 richard 262 
 
1472 richard 263 
# On interdit les connexions directes au port UDP 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
264 
# Deny direct connections on UDP 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 265 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
1472 richard 266 
 
1364 richard 267 
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
268 
# Allow connections for DNSMASQ (with blacklist)
783 richard 269 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
270 
 
1364 richard 271 
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
272 
# Allow connections for DNSMASQ (with whitelist)
273 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
274 
 
1472 richard 275 
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
276 
# Allow connections for DNSMASQ (blackhole mode)
277 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
278 
 
783 richard 279 
# Accès direct aux services internes
280 
# Internal services access
1364 richard 281 
$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 282 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
283 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
284 
$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
285 
$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
286 
$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
287 
$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 288 
 
289 
# SSHD rules if activate
290 
if [ $SSH = on ]
520 richard 291 
	then
783 richard 292 
	$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"
293 
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1063 richard 294 
	$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 295 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 296 
fi
783 richard 297 
 
298 
# Insertion de règles locales
299 
# Here, we add local rules (i.e. VPN from Internet)
300 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
301 
        . /usr/local/etc/alcasar-iptables-local.sh
302 
fi
303 
 
304 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
305 
# Deny and log on INPUT from the LAN
306 
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
307 
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
308 
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
309 
 
1393 richard 310 
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 311 
# Reject INTIF access (only when chilli is down)
312 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
313 
$IPTABLES -A INPUT -i $INTIF -j REJECT
314 
 
315 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
316 
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
317 
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
318 
 
319 
#############################
320 
#        FORWARD            #
321 
#############################
322 
 
1364 richard 323 
# Blocage des IPs du SET blacklist_ip_blocked pour le SET havp_bl_set
324 
# Deny IPs of the SET blacklist_ip_blocked for the set havp_bl_set
325 
$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
326 
$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
327 
$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
328 
 
783 richard 329 
# Rejet des requêtes DNS vers Internet
330 
# Deny forward DNS
331 
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
332 
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
333 
 
815 richard 334 
# Autorisation des retours de connexions légitimes
335 
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 336 
 
1364 richard 337 
#  If protocols filter is activate
1488 richard 338 
if [ $PROTOCOLS_FILTERING = on ]; then
339 
	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
340 
	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
341 
	if [ $nb_uamallowed != "0" ]
342 
	then
343 
		while read ip_allowed_line
344 
		do
345 
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
346 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
347 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
348 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
349 
		done < /usr/local/etc/alcasar-uamallowed
350 
	fi
351 
	# Autorisation du HTTP et des protocoles non commentés
352 
	# Allow HTTP and non comment protocols
353 
	$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 "
354 
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NETFLOW
355 
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ACCEPT
356 
	while read svc_line
357 
	do
358 
		svc_on=`echo $svc_line|cut -b1`
359 
		if [ $svc_on != "#" ]
360 
		then
361 
			svc_name=`echo $svc_line|cut -d" " -f1`
362 
			svc_port=`echo $svc_line|cut -d" " -f2`
363 
			if [ $svc_name = "icmp" ]
364 
			then
365 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
366 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT
367 
			else
492 franck 368 
 
1488 richard 369 
				$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 "
370 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
371 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
372 
				$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 "
373 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
374 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
375 
			fi
376 
		fi
377 
	done < /usr/local/etc/alcasar-services
378 
	# Rejet explicite des autres protocoles
379 
	# reject the others protocols
380 
	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
381 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
382 
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
383 
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
384 
fi
385 
 
492 franck 386 
#  If QOS is activate  #
612 richard 387 
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 388 
	. /usr/local/etc/alcasar-iptables-qos.sh
389 
fi
390 
 
498 richard 391 
# Autorisation des connections sortant du LAN
476 richard 392 
# Allow forward connections with log
1221 richard 393 
#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
1159 crox53 394 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 395 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 396 
 
783 richard 397 
#############################
398 
#         OUTPUT            #
399 
#############################
1159 crox53 400 
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
401 
# Everything is allowed but traffic through outside network interface
498 richard 402 
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 403 
 
1587 richard 404 
# Si configéré, on autorise les requêtes DHCP
405 
# Allow DHCP requests if configured
406 
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
407 
if [[ "$public_ip_mask" == "dhcp" ]]
408 
then
409 
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
410 
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
411 
fi
412 
 
503 richard 413 
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 414 
# Allow DNS requests to identified DNS servers
415 
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 416 
 
615 richard 417 
# On autorise les requêtes HTTP sortantes
498 richard 418 
# HTTP requests are allowed
1159 crox53 419 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 420 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 421 
 
784 richard 422 
# On autorise les requêtes FTP
423 
# FTP requests are allowed
424 
modprobe ip_conntrack_ftp
425 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 426 
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 427 
 
615 richard 428 
# On autorise les requêtes NTP
498 richard 429 
# NTP requests are allowed
430 
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 431 
 
503 richard 432 
# On autorise les requêtes ICMP (ping)
433 
# ICMP (ping) requests are allowed
434 
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 435 
 
615 richard 436 
# On autorise les requêtes LDAP si un serveur externe est configué
437 
# LDAP requests are allowed if an external server is declared
438 
if [ $LDAP = on ]
439 
	then
694 franck 440 
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
441 
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 442 
fi
783 richard 443 
 
444 
#############################
445 
#       POSTROUTING         #
446 
#############################
498 richard 447 
# Traduction dynamique d'adresse en sortie
476 richard 448 
# Dynamic NAT on EXTIF
1 root 449 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
450 
 
476 richard 451 
# End of script
1 root 452