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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2234 2017-05-18 21:20:10Z 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);
1221 richard 10
#	2 protection of ALCASAR with the Ulog group 1 (default group) 
1294 richard 11
#	3 SSH on ALCASAR with the Ulog group 2;
12
#	4 extern access attempts on ALCASAR with the Ulog group 3.
1469 richard 13
# The bootps/dhcp (67) port is always open on tun0/INTIF by coova 
14
CONF_FILE="/usr/local/etc/alcasar.conf"
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
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
1364 richard 38
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set 
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)
1469 richard 44
LDAP=`grep ^LDAP= $CONF_FILE|cut -d"=" -f2`				# LDAP external server active (on/off)
615 richard 45
LDAP=${LDAP:=off}
1469 richard 46
LDAP_IP=`grep ^LDAP_IP= $CONF_FILE|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
768 richard 47
LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
612 richard 48
IPTABLES="/sbin/iptables"
1339 richard 49
IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
1364 richard 50
SAVE_DIR="/etc/sysconfig"						# Saving path
1 root 51
 
1364 richard 52
# Sauvegarde des SET des utilisateurs connectés si ils existent
53
# Saving SET of connected users if it exists
1867 raphael.pi 54
ipset list not_filtered 1>/dev/null 2>&1
1364 richard 55
if [ $? -eq 0 ];
56
then
1867 raphael.pi 57
	ipset save not_filtered > $TMP_users_set_save
1872 richard 58
	ipset save havp >> $TMP_users_set_save
59
	ipset save havp_bl >> $TMP_users_set_save
60
	ipset save havp_wl >> $TMP_users_set_save
2006 raphael.pi 61
	ipset save proto_0 >> $TMP_users_set_save
62
	ipset save proto_1 >> $TMP_users_set_save
63
	ipset save proto_2 >> $TMP_users_set_save
64
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 65
fi
66
 
1291 richard 67
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 68
modprobe ipt_NETFLOW destination=127.0.0.1:2055
69
 
498 richard 70
# Effacement des règles existantes
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# Flush all existing rules
1 root 72
$IPTABLES -F
73
$IPTABLES -t nat -F
74
$IPTABLES -t mangle -F
75
$IPTABLES -F INPUT
76
$IPTABLES -F FORWARD
77
$IPTABLES -F OUTPUT
78
 
498 richard 79
# Suppression des chaines utilisateurs sur les tables filter et nat
80
# Flush non default rules on filter and nat tables
81
$IPTABLES -X
82
$IPTABLES -t nat -X
83
 
84
# Stratégies par défaut
476 richard 85
# Default policies
1 root 86
$IPTABLES -P INPUT DROP
87
$IPTABLES -P FORWARD DROP
498 richard 88
$IPTABLES -P OUTPUT DROP
1 root 89
$IPTABLES -t nat -P PREROUTING ACCEPT
90
$IPTABLES -t nat -P POSTROUTING ACCEPT
91
$IPTABLES -t nat -P OUTPUT ACCEPT
92
 
1484 richard 93
 
94
#############################
95
#          IPSET            #
96
#############################
97
 
1291 richard 98
# destruction de tous les SET
1332 richard 99
# destroy all SET
1876 raphael.pi 100
ipset flush
1291 richard 101
ipset destroy
1855 raphael.pi 102
 
1484 richard 103
###### BL set  ###########
104
# Calcul de la taille / Compute the length
1932 richard 105
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 106
# Chargement / loading
1867 raphael.pi 107
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 108
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 109
do
1364 richard 110
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 111
done
1364 richard 112
ipset -! restore < $TMP_set_save
113
rm -f $TMP_set_save
1484 richard 114
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 115
for ip in $(cat $IP_REHABILITEES)
116
do
1867 raphael.pi 117
	ipset del bl_ip_blocked $ip
1339 richard 118
done
119
 
1484 richard 120
###### WL set  ###########
1932 richard 121
# taille fixe, car peupler par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 122
wl_set_length=65536
1484 richard 123
# Chargement Loading
1867 raphael.pi 124
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 125
#get ip-wl files from ACC
1932 richard 126
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 127
do
1932 richard 128
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 129
done
1364 richard 130
ipset -! restore < $TMP_set_save
131
rm -f $TMP_set_save
132
 
133
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET 
1377 richard 134
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 135
if [ -e $TMP_users_set_save ];
136
then
137
	ipset -! restore < $TMP_users_set_save
138
	rm -f $TMP_users_set_save
139
else
1867 raphael.pi 140
	ipset create not_filtered hash:net hashsize 1024
1872 richard 141
	ipset create havp hash:net hashsize 1024
142
	ipset create havp_bl hash:net hashsize 1024
143
	ipset create havp_wl hash:net hashsize 1024
2006 raphael.pi 144
	#pour les filtrages de protocole par utilisateur
145
	ipset create proto_0 hash:net hashsize 1024
146
	ipset create proto_1 hash:net hashsize 1024
147
	ipset create proto_2 hash:net hashsize 1024
148
	ipset create proto_3 hash:net hashsize 1024
1364 richard 149
fi
150
 
472 richard 151
#############################
783 richard 152
#       PREROUTING          #
472 richard 153
#############################
1827 raphael.pi 154
 
1453 franck 155
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
156
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 157
#$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 158
 
1486 richard 159
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
1962 richard 160
# Mark (and log) the direct attempts to TCP port 8090 (dansguardian) in order to REJECT them in INPUT rules
1731 richard 161
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j NFLOG --nflog-prefix "RULE direct-proxy -- DENY "
783 richard 162
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 163
 
1486 richard 164
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
1962 richard 165
# Mark (and log) the direct attempts to TCP port 8090 (tinyproxy) in order to REJECT them in INPUT rules
1704 richard 166
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8090 -j NFLOG --nflog-prefix "RULE direct-proxy -- DENY "
1486 richard 167
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
168
 
1962 richard 169
# Marquage des paquets qui tentent d'accéder directement au port 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
170
# Mark the direct attempts to port 54 (DNS-blacklist) in order to REJECT them in INPUT rules
1486 richard 171
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 172
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
783 richard 173
 
1962 richard 174
# Marquage des paquets qui tentent d'accéder directement au port 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
175
# Mark the direct attempts to port 55 (DNS-whitelist) in order to REJECT them in INPUT rules
1486 richard 176
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 177
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
783 richard 178
 
1962 richard 179
# Marquage des paquets qui tentent d'accéder directement au port 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
180
# Mark the direct attempts to port 56 (DNS-blackhole) in order to REJECT them in INPUT rules
1486 richard 181
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 182
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 183
 
1544 richard 184
# redirection DNS des usagers 'havp_bl' vers le port 54
185
# redirect DNS of 'havp_bl' users to port 54
1872 richard 186
$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 187
 
1544 richard 188
# redirection DNS des usagers 'havp_wl' vers le port 55
1872 richard 189
# redirect DNS of 'havp_wl' users to port 55
190
$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 191
 
1544 richard 192
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow. 
193
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
1872 richard 194
$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-prefix "RULE F_http -- ACCEPT "
1544 richard 195
 
196
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
197
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1872 richard 198
$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 199
 
1544 richard 200
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
201
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1872 richard 202
$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 203
 
1544 richard 204
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 205
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
1872 richard 206
$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 207
 
1544 richard 208
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 209
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1872 richard 210
$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
211
$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 212
 
783 richard 213
# Redirection des requêtes NTP vers le serveur NTP local
214
# Redirect NTP request in local NTP server
215
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
216
 
472 richard 217
#############################
783 richard 218
#         INPUT             #
472 richard 219
#############################
871 richard 220
 
783 richard 221
# Tout passe sur loopback
222
# accept all on loopback
223
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 224
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 225
 
226
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
227
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 228
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
229
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
230
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
231
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 232
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 233
 
1587 richard 234
# Si configéré, on autorise les réponses DHCP 
235
# Allow DHCP answers if configured
236
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
237
if [[ "$public_ip_mask" == "dhcp" ]]
238
then
239
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
240
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
241
fi
871 richard 242
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
243
# Drop broadcast & multicast on EXTIF to avoid log 
1629 richard 244
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 245
 
783 richard 246
# On autorise les retours de connexions légitimes par INPUT
247
# Conntrack on INPUT
248
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 249
 
1221 richard 250
# 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 251
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 252
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 253
 
783 richard 254
# Autorisation des connexions légitimes à DansGuardian 
255
# Allow connections for DansGuardian
256
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 257
 
1486 richard 258
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
259
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
260
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
261
 
262
# Autorisation des connexions légitimes vers tinyproxy 
263
# Allow connections to tinyproxy
264
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
265
 
1962 richard 266
# On interdit les connexions directes au port 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
267
# Deny direct connections on port 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
268
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
269
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
791 richard 270
 
1962 richard 271
# On interdit les connexions directes au port 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
272
# Deny direct connections on port 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
273
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
274
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1364 richard 275
 
1962 richard 276
# On interdit les connexions directes au port 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
277
# Deny direct connections on port 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
278
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
279
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1472 richard 280
 
1364 richard 281
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
282
# Allow connections for DNSMASQ (with blacklist)
783 richard 283
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 284
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
783 richard 285
 
1364 richard 286
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
287
# Allow connections for DNSMASQ (with whitelist)
288
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 289
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
1364 richard 290
 
1472 richard 291
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
292
# Allow connections for DNSMASQ (blackhole mode)
293
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 294
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 295
 
783 richard 296
# Accès direct aux services internes
297
# Internal services access
1962 richard 298
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS 
299
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 300
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
301
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
302
$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
303
$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
304
$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
305
$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 306
 
307
# SSHD rules if activate 
308
if [ $SSH = on ]
520 richard 309
	then
1731 richard 310
	$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 311
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1731 richard 312
	$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 313
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 314
fi
783 richard 315
 
316
# Insertion de règles locales
317
# Here, we add local rules (i.e. VPN from Internet)
318
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
319
        . /usr/local/etc/alcasar-iptables-local.sh
320
fi
321
 
322
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
323
# Deny and log on INPUT from the LAN
1704 richard 324
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j NFLOG --nflog-prefix "RULE rej-int -- REJECT "
783 richard 325
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
326
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
327
 
1393 richard 328
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 329
# Reject INTIF access (only when chilli is down)
1704 richard 330
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 331
$IPTABLES -A INPUT -i $INTIF -j REJECT
332
 
333
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
334
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
1731 richard 335
$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 336
 
337
#############################
338
#        FORWARD            #
339
#############################
340
 
1872 richard 341
# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl
342
# Deny IPs of the SET bl_ip_blocked for the set havp_bl
2187 richard 343
$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
344
$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 345
$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 346
 
783 richard 347
# Rejet des requêtes DNS vers Internet
348
# Deny forward DNS
349
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
350
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
351
 
2184 richard 352
# Active le suivi de session
353
# Allow Conntrack
815 richard 354
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 355
 
2006 raphael.pi 356
# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...) 
357
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
358
if [ $nb_uamallowed != "0" ]
359
then
360
	while read ip_allowed_line 
1488 richard 361
	do
2006 raphael.pi 362
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
363
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
364
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
365
	done < /usr/local/etc/alcasar-uamallowed
366
fi
492 franck 367
 
2184 richard 368
# filtrage protocole par utilisateur (profile 1 : http, https)
369
# protocols filtering for users (profil 1 : http, https)
370
	$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
371
	$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 372
 
2184 richard 373
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
374
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 375
 
2184 richard 376
	$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
377
	$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 378
 
2184 richard 379
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
380
# protocols filtering for users (profil 3 : customized with ACC)
2006 raphael.pi 381
#profile 3 personalisables via l'ACC
2184 richard 382
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 383
while read svc_line
384
do
385
	svc_on=`echo $svc_line|cut -b1`
386
	if [ $svc_on != "#" ]
387
	then	
388
		svc_name=`echo $svc_line|cut -d" " -f1`
389
		svc_port=`echo $svc_line|cut -d" " -f2`
390
		if [ $svc_name = "icmp" ]
391
		then
2184 richard 392
			svc_icmp="on"
2006 raphael.pi 393
		else
2184 richard 394
			if [ "$custom_tcp_protocols_list" == "" ]
395
			then
396
				custom_tcp_protocols_list=$svc_port
397
			else
398
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
399
			fi
400
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
401
			if [ $udp_svc = "1" ] # udp service exist
402
			then
403
				if [ "$custom_udp_protocols_list" == "" ]
404
				then
405
					custom_udp_protocols_list=$svc_port
406
				else
407
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
408
				fi
409
			fi
1488 richard 410
		fi
2006 raphael.pi 411
	fi
412
done < /usr/local/etc/alcasar-services
2184 richard 413
	if [ "$custom_tcp_protocols_list" == "" ]
414
	then
415
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
416
	else
417
		if [ "$svc_icmp" != "on" ]
418
		then
419
			$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
420
		fi
421
		$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
422
		$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
423
	fi
1488 richard 424
 
2184 richard 425
# journalisation et autorisation des connections sortant du LAN  
476 richard 426
# Allow forward connections with log
1159 crox53 427
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 428
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 429
 
783 richard 430
#############################
431
#         OUTPUT            #
432
#############################
1159 crox53 433
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
434
# Everything is allowed but traffic through outside network interface
2213 richard 435
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 436
 
1587 richard 437
# Si configéré, on autorise les requêtes DHCP 
438
# Allow DHCP requests if configured
439
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
440
if [[ "$public_ip_mask" == "dhcp" ]]
441
then
442
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
443
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
444
fi
445
 
503 richard 446
# On autorise les requêtes DNS vers les serveurs DNS identifiés 
498 richard 447
# Allow DNS requests to identified DNS servers
448
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 449
 
615 richard 450
# On autorise les requêtes HTTP sortantes
498 richard 451
# HTTP requests are allowed
1159 crox53 452
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 453
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 454
 
1862 raphael.pi 455
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
456
# RSYNC requests are allowed (to update BL of Toulouse)
457
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
458
 
784 richard 459
# On autorise les requêtes FTP 
460
# FTP requests are allowed
1705 richard 461
modprobe nf_conntrack_ftp
784 richard 462
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 463
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 464
 
615 richard 465
# On autorise les requêtes NTP 
498 richard 466
# NTP requests are allowed
467
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 468
 
503 richard 469
# On autorise les requêtes ICMP (ping) 
470
# ICMP (ping) requests are allowed
471
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 472
 
615 richard 473
# On autorise les requêtes LDAP si un serveur externe est configué
474
# LDAP requests are allowed if an external server is declared
475
if [ $LDAP = on ]
476
	then
694 franck 477
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
478
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 479
fi
783 richard 480
 
481
#############################
482
#       POSTROUTING         #
483
#############################
498 richard 484
# Traduction dynamique d'adresse en sortie
476 richard 485
# Dynamic NAT on EXTIF
1 root 486
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
487
 
476 richard 488
# End of script
1 root 489