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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2485 2018-02-05 22:05:03Z franck $
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
675 richard 5
# 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);
2454 tom.houday 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.
2454 tom.houday 13
# The bootps/dhcp (67) port is always open on tun0/INTIF by coova
1469 richard 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}
783 richard 20
PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
604 richard 21
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
1332 richard 36
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1932 richard 37
WL_IP_CAT="/usr/local/share/iptables-wl-enabled"			# categories files of the WhiteListed IP
2454 tom.houday 38
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set
1364 richard 39
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
1469 richard 40
SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
615 richard 41
SSH=${SSH:=off}
1469 richard 42
SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
1063 richard 43
SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
612 richard 44
IPTABLES="/sbin/iptables"
1339 richard 45
IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
2485 franck 46
SITE_DIRECT="/usr/local/etc/alcasar-site-direct"			# Site Direct (no havp and no filtrage) for user BL
1 root 47
 
1364 richard 48
# Sauvegarde des SET des utilisateurs connectés si ils existent
49
# Saving SET of connected users if it exists
1867 raphael.pi 50
ipset list not_filtered 1>/dev/null 2>&1
1364 richard 51
if [ $? -eq 0 ];
52
then
1867 raphael.pi 53
	ipset save not_filtered > $TMP_users_set_save
1872 richard 54
	ipset save havp >> $TMP_users_set_save
55
	ipset save havp_bl >> $TMP_users_set_save
56
	ipset save havp_wl >> $TMP_users_set_save
2006 raphael.pi 57
	ipset save proto_0 >> $TMP_users_set_save
58
	ipset save proto_1 >> $TMP_users_set_save
59
	ipset save proto_2 >> $TMP_users_set_save
60
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 61
fi
62
 
1291 richard 63
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 64
modprobe ipt_NETFLOW destination=127.0.0.1:2055
65
 
498 richard 66
# Effacement des règles existantes
476 richard 67
# Flush all existing rules
1 root 68
$IPTABLES -F
69
$IPTABLES -t nat -F
70
$IPTABLES -t mangle -F
71
$IPTABLES -F INPUT
72
$IPTABLES -F FORWARD
73
$IPTABLES -F OUTPUT
74
 
498 richard 75
# Suppression des chaines utilisateurs sur les tables filter et nat
76
# Flush non default rules on filter and nat tables
77
$IPTABLES -X
78
$IPTABLES -t nat -X
79
 
80
# Stratégies par défaut
476 richard 81
# Default policies
1 root 82
$IPTABLES -P INPUT DROP
83
$IPTABLES -P FORWARD DROP
498 richard 84
$IPTABLES -P OUTPUT DROP
1 root 85
$IPTABLES -t nat -P PREROUTING ACCEPT
86
$IPTABLES -t nat -P POSTROUTING ACCEPT
87
$IPTABLES -t nat -P OUTPUT ACCEPT
88
 
1484 richard 89
 
90
#############################
91
#          IPSET            #
92
#############################
93
 
1291 richard 94
# destruction de tous les SET
1332 richard 95
# destroy all SET
1876 raphael.pi 96
ipset flush
1291 richard 97
ipset destroy
1855 raphael.pi 98
 
1484 richard 99
###### BL set  ###########
100
# Calcul de la taille / Compute the length
1932 richard 101
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 102
# Chargement / loading
1867 raphael.pi 103
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 104
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 105
do
1364 richard 106
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 107
done
1364 richard 108
ipset -! restore < $TMP_set_save
109
rm -f $TMP_set_save
1484 richard 110
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 111
for ip in $(cat $IP_REHABILITEES)
112
do
1867 raphael.pi 113
	ipset del bl_ip_blocked $ip
1339 richard 114
done
115
 
2485 franck 116
# rajout exception havp_bl --> Site en direct pour les Utilisateurs filtrés
117
ipset create site_direct hash:net hashsize 1024
118
for site in $(cat $SITE_DIRECT)
119
do
120
        ipset add site_direct $site
121
done
122
 
1484 richard 123
###### WL set  ###########
1932 richard 124
# taille fixe, car peupler par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 125
wl_set_length=65536
1484 richard 126
# Chargement Loading
1867 raphael.pi 127
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 128
#get ip-wl files from ACC
1932 richard 129
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 130
do
1932 richard 131
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 132
done
1364 richard 133
ipset -! restore < $TMP_set_save
134
rm -f $TMP_set_save
135
 
2454 tom.houday 136
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 137
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 138
if [ -e $TMP_users_set_save ];
139
then
140
	ipset -! restore < $TMP_users_set_save
141
	rm -f $TMP_users_set_save
142
else
2386 tom.houday 143
	ipset create not_filtered hash:ip hashsize 1024
144
	ipset create havp hash:ip hashsize 1024
145
	ipset create havp_bl hash:ip hashsize 1024
146
	ipset create havp_wl hash:ip hashsize 1024
2006 raphael.pi 147
	#pour les filtrages de protocole par utilisateur
2386 tom.houday 148
	ipset create proto_0 hash:ip hashsize 1024
149
	ipset create proto_1 hash:ip hashsize 1024
150
	ipset create proto_2 hash:ip hashsize 1024
151
	ipset create proto_3 hash:ip hashsize 1024
1364 richard 152
fi
153
 
472 richard 154
#############################
783 richard 155
#       PREROUTING          #
472 richard 156
#############################
1827 raphael.pi 157
 
1453 franck 158
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
159
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 160
#$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 161
 
1486 richard 162
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
1962 richard 163
# Mark (and log) the direct attempts to TCP port 8090 (dansguardian) in order to REJECT them in INPUT rules
2355 tom.houday 164
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j NFLOG --nflog-group 1 --nflog-prefix "RULE direct-proxy -- DENY "
783 richard 165
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 166
 
1486 richard 167
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
1962 richard 168
# Mark (and log) the direct attempts to TCP port 8090 (tinyproxy) in order to REJECT them in INPUT rules
2355 tom.houday 169
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8090 -j NFLOG --nflog-group 1 --nflog-prefix "RULE direct-proxy -- DENY "
1486 richard 170
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
171
 
1962 richard 172
# Marquage des paquets qui tentent d'accéder directement au port 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
173
# Mark the direct attempts to port 54 (DNS-blacklist) in order to REJECT them in INPUT rules
1486 richard 174
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 175
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
783 richard 176
 
1962 richard 177
# Marquage des paquets qui tentent d'accéder directement au port 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
178
# Mark the direct attempts to port 55 (DNS-whitelist) in order to REJECT them in INPUT rules
1486 richard 179
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 180
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
783 richard 181
 
1962 richard 182
# Marquage des paquets qui tentent d'accéder directement au port 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
183
# Mark the direct attempts to port 56 (DNS-blackhole) in order to REJECT them in INPUT rules
1486 richard 184
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 185
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 186
 
1544 richard 187
# redirection DNS des usagers 'havp_bl' vers le port 54
188
# redirect DNS of 'havp_bl' users to port 54
1872 richard 189
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
1393 richard 190
 
1544 richard 191
# redirection DNS des usagers 'havp_wl' vers le port 55
1872 richard 192
# redirect DNS of 'havp_wl' users to port 55
193
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 55
1364 richard 194
 
2454 tom.houday 195
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
1544 richard 196
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
2355 tom.houday 197
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE F_http -- ACCEPT "
1544 richard 198
 
199
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
200
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1872 richard 201
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p tcp --dport http -j REDIRECT --to-port 80
1364 richard 202
 
1544 richard 203
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
204
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1872 richard 205
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src -m set ! --match-set wl_ip_allowed dst -p tcp --dport http -j REDIRECT --to-port 80
1393 richard 206
 
1544 richard 207
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 208
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
2485 franck 209
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
210
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport http -j REDIRECT --to-port 8080
1544 richard 211
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 212
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1872 richard 213
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
214
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
1364 richard 215
 
783 richard 216
# Redirection des requêtes NTP vers le serveur NTP local
217
# Redirect NTP request in local NTP server
218
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
219
 
472 richard 220
#############################
783 richard 221
#         INPUT             #
472 richard 222
#############################
871 richard 223
 
783 richard 224
# Tout passe sur loopback
225
# accept all on loopback
226
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 227
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 228
 
229
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
230
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 231
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
232
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
233
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
234
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 235
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 236
 
2454 tom.houday 237
# Si configéré, on autorise les réponses DHCP
1587 richard 238
# Allow DHCP answers if configured
239
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
240
if [[ "$public_ip_mask" == "dhcp" ]]
241
then
242
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
243
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
244
fi
871 richard 245
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
2454 tom.houday 246
# Drop broadcast & multicast on EXTIF to avoid log
1629 richard 247
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 248
 
783 richard 249
# On autorise les retours de connexions légitimes par INPUT
250
# Conntrack on INPUT
251
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 252
 
1221 richard 253
# 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 254
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 255
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 256
 
2454 tom.houday 257
# Autorisation des connexions légitimes à DansGuardian
783 richard 258
# Allow connections for DansGuardian
259
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 260
 
1486 richard 261
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
262
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
263
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
264
 
2454 tom.houday 265
# Autorisation des connexions légitimes vers tinyproxy
1486 richard 266
# Allow connections to tinyproxy
267
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
268
 
1962 richard 269
# On interdit les connexions directes au port 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
270
# Deny direct connections on port 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
271
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
272
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
791 richard 273
 
1962 richard 274
# On interdit les connexions directes au port 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
275
# Deny direct connections on port 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
276
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
277
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1364 richard 278
 
1962 richard 279
# On interdit les connexions directes au port 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
280
# Deny direct connections on port 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
281
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
282
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1472 richard 283
 
1364 richard 284
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
285
# Allow connections for DNSMASQ (with blacklist)
783 richard 286
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 287
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
783 richard 288
 
1364 richard 289
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
290
# Allow connections for DNSMASQ (with whitelist)
291
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 292
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
1364 richard 293
 
1472 richard 294
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
295
# Allow connections for DNSMASQ (blackhole mode)
296
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 297
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 298
 
783 richard 299
# Accès direct aux services internes
300
# Internal services access
2454 tom.houday 301
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
1962 richard 302
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 303
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
304
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
305
$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
306
$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
2370 tom.houday 307
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 3990:3991 -j ACCEPT	# Requêtes de deconnexion usagers # Users logout requests
786 richard 308
$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 309
 
2454 tom.houday 310
# SSHD rules if activate
783 richard 311
if [ $SSH = on ]
520 richard 312
	then
1731 richard 313
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-LAN -- ACCEPT"
783 richard 314
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1731 richard 315
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT"
1161 richard 316
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 317
fi
783 richard 318
 
319
# Insertion de règles locales
320
# Here, we add local rules (i.e. VPN from Internet)
321
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
2454 tom.houday 322
	. /usr/local/etc/alcasar-iptables-local.sh
783 richard 323
fi
324
 
325
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
326
# Deny and log on INPUT from the LAN
2355 tom.houday 327
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-int -- REJECT "
783 richard 328
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
329
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
330
 
1393 richard 331
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 332
# Reject INTIF access (only when chilli is down)
2355 tom.houday 333
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 334
$IPTABLES -A INPUT -i $INTIF -j REJECT
335
 
336
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
337
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
1731 richard 338
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j NFLOG --nflog-group 3 --nflog-threshold 10 --nflog-prefix "RULE rej-ext -- DROP"
783 richard 339
 
340
#############################
341
#        FORWARD            #
342
#############################
343
 
1872 richard 344
# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl
345
# Deny IPs of the SET bl_ip_blocked for the set havp_bl
2187 richard 346
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p icmp -j REJECT --reject-with icmp-host-prohibited
347
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p udp -j REJECT --reject-with icmp-host-prohibited
1872 richard 348
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl src -m set --match-set bl_ip_blocked dst -p tcp -j REJECT --reject-with tcp-reset
1364 richard 349
 
783 richard 350
# Rejet des requêtes DNS vers Internet
351
# Deny forward DNS
352
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
353
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
354
 
2184 richard 355
# Active le suivi de session
356
# Allow Conntrack
815 richard 357
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 358
 
2454 tom.houday 359
# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
2006 raphael.pi 360
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
361
if [ $nb_uamallowed != "0" ]
362
then
2454 tom.houday 363
	while read ip_allowed_line
1488 richard 364
	do
2006 raphael.pi 365
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
366
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
367
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
368
	done < /usr/local/etc/alcasar-uamallowed
369
fi
492 franck 370
 
2184 richard 371
# filtrage protocole par utilisateur (profile 1 : http, https)
372
# protocols filtering for users (profil 1 : http, https)
373
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports http,https -m state --state NEW -j REJECT --reject-with tcp-reset
374
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports http,https -m state --state NEW -j REJECT --reject-with icmp-port-unreachable
2006 raphael.pi 375
 
2184 richard 376
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
377
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 378
 
2184 richard 379
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports http,https,pop3,pop3s,imap,imaps,ftp,ftp-data,sftp,ssh -m state --state NEW -j REJECT --reject-with tcp-reset
380
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports http,https,pop3,pop3s,imap,imaps,ssh -m state --state NEW -j REJECT --reject-with icmp-port-unreachable
2006 raphael.pi 381
 
2184 richard 382
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
383
# protocols filtering for users (profil 3 : customized with ACC)
2006 raphael.pi 384
#profile 3 personalisables via l'ACC
2184 richard 385
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 386
while read svc_line
387
do
388
	svc_on=`echo $svc_line|cut -b1`
389
	if [ $svc_on != "#" ]
390
	then
391
		svc_name=`echo $svc_line|cut -d" " -f1`
392
		svc_port=`echo $svc_line|cut -d" " -f2`
393
		if [ $svc_name = "icmp" ]
394
		then
2184 richard 395
			svc_icmp="on"
2006 raphael.pi 396
		else
2184 richard 397
			if [ "$custom_tcp_protocols_list" == "" ]
398
			then
399
				custom_tcp_protocols_list=$svc_port
400
			else
401
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
402
			fi
403
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
404
			if [ $udp_svc = "1" ] # udp service exist
405
			then
406
				if [ "$custom_udp_protocols_list" == "" ]
407
				then
408
					custom_udp_protocols_list=$svc_port
409
				else
410
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
411
				fi
412
			fi
1488 richard 413
		fi
2006 raphael.pi 414
	fi
415
done < /usr/local/etc/alcasar-services
2184 richard 416
	if [ "$custom_tcp_protocols_list" == "" ]
417
	then
418
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
419
	else
420
		if [ "$svc_icmp" != "on" ]
421
		then
422
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p icmp -j REJECT --reject-with icmp-proto-unreachable
423
		fi
424
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports $custom_tcp_protocols_list -m state --state NEW -j REJECT --reject-with tcp-reset
425
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports $custom_udp_protocols_list -m state --state NEW -j REJECT --reject-with icmp-port-unreachable
426
	fi
1488 richard 427
 
2454 tom.houday 428
# journalisation et autorisation des connections sortant du LAN
476 richard 429
# Allow forward connections with log
1159 crox53 430
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 431
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 432
 
783 richard 433
#############################
434
#         OUTPUT            #
435
#############################
2468 richard 436
# On laisse tout sortir à l'exception de la carte externe (cf ci-dessous)
437
# Everything is allowed apart from outside network interface (see bellow)
2213 richard 438
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 439
 
2468 richard 440
# Si configuré, on autorise les requêtes DHCP
1587 richard 441
# Allow DHCP requests if configured
442
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
443
if [[ "$public_ip_mask" == "dhcp" ]]
444
then
445
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
446
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
447
fi
448
 
2454 tom.houday 449
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 450
# Allow DNS requests to identified DNS servers
451
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 452
 
2468 richard 453
# On autorise les requêtes HTTP avec log Netflow (en provenance de Dansguardian)
454
# HTTPS requests are allowed with netflow log (from Dansguardian)
1159 crox53 455
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 456
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 457
 
2259 tom.houday 458
# On autorise les requêtes HTTPS sortantes
459
# HTTPS requests are allowed
460
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
461
 
1862 raphael.pi 462
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
2468 richard 463
# RSYNC requests are allowed (update of Toulouse BL)
1862 raphael.pi 464
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
465
 
2454 tom.houday 466
# On autorise les requêtes FTP
784 richard 467
# FTP requests are allowed
1705 richard 468
modprobe nf_conntrack_ftp
784 richard 469
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 470
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 471
 
2454 tom.houday 472
# On autorise les requêtes NTP
498 richard 473
# NTP requests are allowed
474
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 475
 
2454 tom.houday 476
# On autorise les requêtes ICMP (ping)
503 richard 477
# ICMP (ping) requests are allowed
478
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 479
 
2468 richard 480
# On autorise les requêtes LDAP
481
# LDAP requests are allowed
482
$IPTABLES -A OUTPUT -o $EXTIF -p tcp -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
483
$IPTABLES -A OUTPUT -o $EXTIF -p udp -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
783 richard 484
 
485
#############################
486
#       POSTROUTING         #
487
#############################
498 richard 488
# Traduction dynamique d'adresse en sortie
476 richard 489
# Dynamic NAT on EXTIF
1 root 490
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
491
 
476 richard 492
# End of script