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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2468 2017-12-27 17:22:39Z 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
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
1 root 46
 
1364 richard 47
# Sauvegarde des SET des utilisateurs connectés si ils existent
48
# Saving SET of connected users if it exists
1867 raphael.pi 49
ipset list not_filtered 1>/dev/null 2>&1
1364 richard 50
if [ $? -eq 0 ];
51
then
1867 raphael.pi 52
	ipset save not_filtered > $TMP_users_set_save
1872 richard 53
	ipset save havp >> $TMP_users_set_save
54
	ipset save havp_bl >> $TMP_users_set_save
55
	ipset save havp_wl >> $TMP_users_set_save
2006 raphael.pi 56
	ipset save proto_0 >> $TMP_users_set_save
57
	ipset save proto_1 >> $TMP_users_set_save
58
	ipset save proto_2 >> $TMP_users_set_save
59
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 60
fi
61
 
1291 richard 62
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 63
modprobe ipt_NETFLOW destination=127.0.0.1:2055
64
 
498 richard 65
# Effacement des règles existantes
476 richard 66
# Flush all existing rules
1 root 67
$IPTABLES -F
68
$IPTABLES -t nat -F
69
$IPTABLES -t mangle -F
70
$IPTABLES -F INPUT
71
$IPTABLES -F FORWARD
72
$IPTABLES -F OUTPUT
73
 
498 richard 74
# Suppression des chaines utilisateurs sur les tables filter et nat
75
# Flush non default rules on filter and nat tables
76
$IPTABLES -X
77
$IPTABLES -t nat -X
78
 
79
# Stratégies par défaut
476 richard 80
# Default policies
1 root 81
$IPTABLES -P INPUT DROP
82
$IPTABLES -P FORWARD DROP
498 richard 83
$IPTABLES -P OUTPUT DROP
1 root 84
$IPTABLES -t nat -P PREROUTING ACCEPT
85
$IPTABLES -t nat -P POSTROUTING ACCEPT
86
$IPTABLES -t nat -P OUTPUT ACCEPT
87
 
1484 richard 88
 
89
#############################
90
#          IPSET            #
91
#############################
92
 
1291 richard 93
# destruction de tous les SET
1332 richard 94
# destroy all SET
1876 raphael.pi 95
ipset flush
1291 richard 96
ipset destroy
1855 raphael.pi 97
 
1484 richard 98
###### BL set  ###########
99
# Calcul de la taille / Compute the length
1932 richard 100
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 101
# Chargement / loading
1867 raphael.pi 102
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 103
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 104
do
1364 richard 105
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 106
done
1364 richard 107
ipset -! restore < $TMP_set_save
108
rm -f $TMP_set_save
1484 richard 109
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 110
for ip in $(cat $IP_REHABILITEES)
111
do
1867 raphael.pi 112
	ipset del bl_ip_blocked $ip
1339 richard 113
done
114
 
1484 richard 115
###### WL set  ###########
1932 richard 116
# taille fixe, car peupler par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 117
wl_set_length=65536
1484 richard 118
# Chargement Loading
1867 raphael.pi 119
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 120
#get ip-wl files from ACC
1932 richard 121
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 122
do
1932 richard 123
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 124
done
1364 richard 125
ipset -! restore < $TMP_set_save
126
rm -f $TMP_set_save
127
 
2454 tom.houday 128
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 129
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 130
if [ -e $TMP_users_set_save ];
131
then
132
	ipset -! restore < $TMP_users_set_save
133
	rm -f $TMP_users_set_save
134
else
2386 tom.houday 135
	ipset create not_filtered hash:ip hashsize 1024
136
	ipset create havp hash:ip hashsize 1024
137
	ipset create havp_bl hash:ip hashsize 1024
138
	ipset create havp_wl hash:ip hashsize 1024
2006 raphael.pi 139
	#pour les filtrages de protocole par utilisateur
2386 tom.houday 140
	ipset create proto_0 hash:ip hashsize 1024
141
	ipset create proto_1 hash:ip hashsize 1024
142
	ipset create proto_2 hash:ip hashsize 1024
143
	ipset create proto_3 hash:ip hashsize 1024
1364 richard 144
fi
145
 
472 richard 146
#############################
783 richard 147
#       PREROUTING          #
472 richard 148
#############################
1827 raphael.pi 149
 
1453 franck 150
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
151
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 152
#$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 153
 
1486 richard 154
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
1962 richard 155
# Mark (and log) the direct attempts to TCP port 8090 (dansguardian) in order to REJECT them in INPUT rules
2355 tom.houday 156
$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 157
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 158
 
1486 richard 159
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
1962 richard 160
# Mark (and log) the direct attempts to TCP port 8090 (tinyproxy) in order to REJECT them in INPUT rules
2355 tom.houday 161
$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 162
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
163
 
1962 richard 164
# Marquage des paquets qui tentent d'accéder directement au port 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
165
# Mark the direct attempts to port 54 (DNS-blacklist) in order to REJECT them in INPUT rules
1486 richard 166
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 167
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
783 richard 168
 
1962 richard 169
# Marquage des paquets qui tentent d'accéder directement au port 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
170
# Mark the direct attempts to port 55 (DNS-whitelist) in order to REJECT them in INPUT rules
1486 richard 171
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 172
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
783 richard 173
 
1962 richard 174
# Marquage des paquets qui tentent d'accéder directement au port 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
175
# Mark the direct attempts to port 56 (DNS-blackhole) in order to REJECT them in INPUT rules
1486 richard 176
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 177
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 178
 
1544 richard 179
# redirection DNS des usagers 'havp_bl' vers le port 54
180
# redirect DNS of 'havp_bl' users to port 54
1872 richard 181
$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 182
 
1544 richard 183
# redirection DNS des usagers 'havp_wl' vers le port 55
1872 richard 184
# redirect DNS of 'havp_wl' users to port 55
185
$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 186
 
2454 tom.houday 187
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
1544 richard 188
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
2355 tom.houday 189
$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 190
 
191
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
192
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1872 richard 193
$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 194
 
1544 richard 195
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
196
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1872 richard 197
$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 198
 
1544 richard 199
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 200
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
1872 richard 201
$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
1484 richard 202
 
1544 richard 203
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 204
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1872 richard 205
$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
206
$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 207
 
783 richard 208
# Redirection des requêtes NTP vers le serveur NTP local
209
# Redirect NTP request in local NTP server
210
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
211
 
472 richard 212
#############################
783 richard 213
#         INPUT             #
472 richard 214
#############################
871 richard 215
 
783 richard 216
# Tout passe sur loopback
217
# accept all on loopback
218
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 219
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 220
 
221
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
222
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 223
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
224
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
225
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
226
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 227
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 228
 
2454 tom.houday 229
# Si configéré, on autorise les réponses DHCP
1587 richard 230
# Allow DHCP answers if configured
231
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
232
if [[ "$public_ip_mask" == "dhcp" ]]
233
then
234
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
235
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
236
fi
871 richard 237
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
2454 tom.houday 238
# Drop broadcast & multicast on EXTIF to avoid log
1629 richard 239
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 240
 
783 richard 241
# On autorise les retours de connexions légitimes par INPUT
242
# Conntrack on INPUT
243
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 244
 
1221 richard 245
# 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 246
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 247
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 248
 
2454 tom.houday 249
# Autorisation des connexions légitimes à DansGuardian
783 richard 250
# Allow connections for DansGuardian
251
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 252
 
1486 richard 253
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
254
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
255
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
256
 
2454 tom.houday 257
# Autorisation des connexions légitimes vers tinyproxy
1486 richard 258
# Allow connections to tinyproxy
259
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
260
 
1962 richard 261
# On interdit les connexions directes au port 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
262
# Deny direct connections on port 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
263
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
264
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
791 richard 265
 
1962 richard 266
# On interdit les connexions directes au port 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
267
# Deny direct connections on port 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
268
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
269
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1364 richard 270
 
1962 richard 271
# On interdit les connexions directes au port 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
272
# Deny direct connections on port 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
273
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
274
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1472 richard 275
 
1364 richard 276
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
277
# Allow connections for DNSMASQ (with blacklist)
783 richard 278
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 279
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
783 richard 280
 
1364 richard 281
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
282
# Allow connections for DNSMASQ (with whitelist)
283
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 284
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
1364 richard 285
 
1472 richard 286
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
287
# Allow connections for DNSMASQ (blackhole mode)
288
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 289
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 290
 
783 richard 291
# Accès direct aux services internes
292
# Internal services access
2454 tom.houday 293
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
1962 richard 294
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 295
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
296
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
297
$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
298
$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 299
$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 300
$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 301
 
2454 tom.houday 302
# SSHD rules if activate
783 richard 303
if [ $SSH = on ]
520 richard 304
	then
1731 richard 305
	$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 306
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1731 richard 307
	$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 308
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 309
fi
783 richard 310
 
311
# Insertion de règles locales
312
# Here, we add local rules (i.e. VPN from Internet)
313
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
2454 tom.houday 314
	. /usr/local/etc/alcasar-iptables-local.sh
783 richard 315
fi
316
 
317
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
318
# Deny and log on INPUT from the LAN
2355 tom.houday 319
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-int -- REJECT "
783 richard 320
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
321
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
322
 
1393 richard 323
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 324
# Reject INTIF access (only when chilli is down)
2355 tom.houday 325
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 326
$IPTABLES -A INPUT -i $INTIF -j REJECT
327
 
328
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
329
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
1731 richard 330
$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 331
 
332
#############################
333
#        FORWARD            #
334
#############################
335
 
1872 richard 336
# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl
337
# Deny IPs of the SET bl_ip_blocked for the set havp_bl
2187 richard 338
$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
339
$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 340
$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 341
 
783 richard 342
# Rejet des requêtes DNS vers Internet
343
# Deny forward DNS
344
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
345
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
346
 
2184 richard 347
# Active le suivi de session
348
# Allow Conntrack
815 richard 349
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 350
 
2454 tom.houday 351
# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
2006 raphael.pi 352
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
353
if [ $nb_uamallowed != "0" ]
354
then
2454 tom.houday 355
	while read ip_allowed_line
1488 richard 356
	do
2006 raphael.pi 357
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
358
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
359
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
360
	done < /usr/local/etc/alcasar-uamallowed
361
fi
492 franck 362
 
2184 richard 363
# filtrage protocole par utilisateur (profile 1 : http, https)
364
# protocols filtering for users (profil 1 : http, https)
365
	$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
366
	$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 367
 
2184 richard 368
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
369
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 370
 
2184 richard 371
	$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
372
	$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 373
 
2184 richard 374
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
375
# protocols filtering for users (profil 3 : customized with ACC)
2006 raphael.pi 376
#profile 3 personalisables via l'ACC
2184 richard 377
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 378
while read svc_line
379
do
380
	svc_on=`echo $svc_line|cut -b1`
381
	if [ $svc_on != "#" ]
382
	then	
383
		svc_name=`echo $svc_line|cut -d" " -f1`
384
		svc_port=`echo $svc_line|cut -d" " -f2`
385
		if [ $svc_name = "icmp" ]
386
		then
2184 richard 387
			svc_icmp="on"
2006 raphael.pi 388
		else
2184 richard 389
			if [ "$custom_tcp_protocols_list" == "" ]
390
			then
391
				custom_tcp_protocols_list=$svc_port
392
			else
393
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
394
			fi
395
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
396
			if [ $udp_svc = "1" ] # udp service exist
397
			then
398
				if [ "$custom_udp_protocols_list" == "" ]
399
				then
400
					custom_udp_protocols_list=$svc_port
401
				else
402
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
403
				fi
404
			fi
1488 richard 405
		fi
2006 raphael.pi 406
	fi
407
done < /usr/local/etc/alcasar-services
2184 richard 408
	if [ "$custom_tcp_protocols_list" == "" ]
409
	then
410
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
411
	else
412
		if [ "$svc_icmp" != "on" ]
413
		then
414
			$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
415
		fi
416
		$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
417
		$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
418
	fi
1488 richard 419
 
2454 tom.houday 420
# journalisation et autorisation des connections sortant du LAN
476 richard 421
# Allow forward connections with log
1159 crox53 422
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 423
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 424
 
783 richard 425
#############################
426
#         OUTPUT            #
427
#############################
2468 richard 428
# On laisse tout sortir à l'exception de la carte externe (cf ci-dessous)
429
# Everything is allowed apart from outside network interface (see bellow)
2213 richard 430
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 431
 
2468 richard 432
# Si configuré, on autorise les requêtes DHCP
1587 richard 433
# Allow DHCP requests if configured
434
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
435
if [[ "$public_ip_mask" == "dhcp" ]]
436
then
437
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
438
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
439
fi
440
 
2454 tom.houday 441
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 442
# Allow DNS requests to identified DNS servers
443
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 444
 
2468 richard 445
# On autorise les requêtes HTTP avec log Netflow (en provenance de Dansguardian)
446
# HTTPS requests are allowed with netflow log (from Dansguardian)
1159 crox53 447
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 448
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 449
 
2259 tom.houday 450
# On autorise les requêtes HTTPS sortantes
451
# HTTPS requests are allowed
452
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
453
 
1862 raphael.pi 454
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
2468 richard 455
# RSYNC requests are allowed (update of Toulouse BL)
1862 raphael.pi 456
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
457
 
2454 tom.houday 458
# On autorise les requêtes FTP
784 richard 459
# FTP requests are allowed
1705 richard 460
modprobe nf_conntrack_ftp
784 richard 461
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 462
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 463
 
2454 tom.houday 464
# On autorise les requêtes NTP
498 richard 465
# NTP requests are allowed
466
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 467
 
2454 tom.houday 468
# On autorise les requêtes ICMP (ping)
503 richard 469
# ICMP (ping) requests are allowed
470
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 471
 
2468 richard 472
# On autorise les requêtes LDAP
473
# LDAP requests are allowed
474
$IPTABLES -A OUTPUT -o $EXTIF -p tcp -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
475
$IPTABLES -A OUTPUT -o $EXTIF -p udp -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
783 richard 476
 
477
#############################
478
#       POSTROUTING         #
479
#############################
498 richard 480
# Traduction dynamique d'adresse en sortie
476 richard 481
# Dynamic NAT on EXTIF
1 root 482
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
483
 
476 richard 484
# End of script