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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2454 2017-12-09 18:59:31Z tom.houdayer $
675 richard 3
# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
1339 richard 4
# This script writes the netfilter rules for ALCASAR
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# Rexy - 3abtux - CPN
6
#
7
# Reminders
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# There are four channels for log :
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#	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)
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#	3 SSH on ALCASAR with the Ulog group 2;
12
#	4 extern access attempts on ALCASAR with the Ulog group 3.
2454 tom.houday 13
# The bootps/dhcp (67) port is always open on tun0/INTIF by coova
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CONF_FILE="/usr/local/etc/alcasar.conf"
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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= $CONF_FILE|cut -d"=" -f2`
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private_ip_mask=${private_ip_mask:=192.168.182.1/24}
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PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
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private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
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= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
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if [[ "$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"
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	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`
1585 richard 29
fi
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PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
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dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`
32
dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`
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dns1=${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= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
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SSH=${SSH:=off}
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SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
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SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
1469 richard 44
LDAP=`grep ^LDAP= $CONF_FILE|cut -d"=" -f2`				# LDAP external server active (on/off)
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LDAP=${LDAP:=off}
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LDAP_IP=`grep ^LDAP_IP= $CONF_FILE|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
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LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
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IPTABLES="/sbin/iptables"
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IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
1 root 50
 
1364 richard 51
# Sauvegarde des SET des utilisateurs connectés si ils existent
52
# Saving SET of connected users if it exists
1867 raphael.pi 53
ipset list not_filtered 1>/dev/null 2>&1
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if [ $? -eq 0 ];
55
then
1867 raphael.pi 56
	ipset save not_filtered > $TMP_users_set_save
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	ipset save havp >> $TMP_users_set_save
58
	ipset save havp_bl >> $TMP_users_set_save
59
	ipset save havp_wl >> $TMP_users_set_save
2006 raphael.pi 60
	ipset save proto_0 >> $TMP_users_set_save
61
	ipset save proto_1 >> $TMP_users_set_save
62
	ipset save proto_2 >> $TMP_users_set_save
63
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 64
fi
65
 
1291 richard 66
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 67
modprobe ipt_NETFLOW destination=127.0.0.1:2055
68
 
498 richard 69
# Effacement des règles existantes
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# Flush all existing rules
1 root 71
$IPTABLES -F
72
$IPTABLES -t nat -F
73
$IPTABLES -t mangle -F
74
$IPTABLES -F INPUT
75
$IPTABLES -F FORWARD
76
$IPTABLES -F OUTPUT
77
 
498 richard 78
# Suppression des chaines utilisateurs sur les tables filter et nat
79
# Flush non default rules on filter and nat tables
80
$IPTABLES -X
81
$IPTABLES -t nat -X
82
 
83
# Stratégies par défaut
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# Default policies
1 root 85
$IPTABLES -P INPUT DROP
86
$IPTABLES -P FORWARD DROP
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$IPTABLES -P OUTPUT DROP
1 root 88
$IPTABLES -t nat -P PREROUTING ACCEPT
89
$IPTABLES -t nat -P POSTROUTING ACCEPT
90
$IPTABLES -t nat -P OUTPUT ACCEPT
91
 
1484 richard 92
 
93
#############################
94
#          IPSET            #
95
#############################
96
 
1291 richard 97
# destruction de tous les SET
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# destroy all SET
1876 raphael.pi 99
ipset flush
1291 richard 100
ipset destroy
1855 raphael.pi 101
 
1484 richard 102
###### BL set  ###########
103
# Calcul de la taille / Compute the length
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bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
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# Chargement / loading
1867 raphael.pi 106
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
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for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 108
do
1364 richard 109
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 110
done
1364 richard 111
ipset -! restore < $TMP_set_save
112
rm -f $TMP_set_save
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# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 114
for ip in $(cat $IP_REHABILITEES)
115
do
1867 raphael.pi 116
	ipset del bl_ip_blocked $ip
1339 richard 117
done
118
 
1484 richard 119
###### WL set  ###########
1932 richard 120
# taille fixe, car peupler par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 121
wl_set_length=65536
1484 richard 122
# Chargement Loading
1867 raphael.pi 123
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
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#get ip-wl files from ACC
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for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 126
do
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	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 128
done
1364 richard 129
ipset -! restore < $TMP_set_save
130
rm -f $TMP_set_save
131
 
2454 tom.houday 132
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 133
# Restoring the connected users SETs if available, otherwise creating SETs
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if [ -e $TMP_users_set_save ];
135
then
136
	ipset -! restore < $TMP_users_set_save
137
	rm -f $TMP_users_set_save
138
else
2386 tom.houday 139
	ipset create not_filtered hash:ip hashsize 1024
140
	ipset create havp hash:ip hashsize 1024
141
	ipset create havp_bl hash:ip hashsize 1024
142
	ipset create havp_wl hash:ip hashsize 1024
2006 raphael.pi 143
	#pour les filtrages de protocole par utilisateur
2386 tom.houday 144
	ipset create proto_0 hash:ip hashsize 1024
145
	ipset create proto_1 hash:ip hashsize 1024
146
	ipset create proto_2 hash:ip hashsize 1024
147
	ipset create proto_3 hash:ip hashsize 1024
1364 richard 148
fi
149
 
472 richard 150
#############################
783 richard 151
#       PREROUTING          #
472 richard 152
#############################
1827 raphael.pi 153
 
1453 franck 154
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
155
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 156
#$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 157
 
1486 richard 158
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
1962 richard 159
# Mark (and log) the direct attempts to TCP port 8090 (dansguardian) in order to REJECT them in INPUT rules
2355 tom.houday 160
$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 161
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 162
 
1486 richard 163
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
1962 richard 164
# Mark (and log) the direct attempts to TCP port 8090 (tinyproxy) in order to REJECT them in INPUT rules
2355 tom.houday 165
$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 166
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
167
 
1962 richard 168
# Marquage des paquets qui tentent d'accéder directement au port 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
169
# Mark the direct attempts to port 54 (DNS-blacklist) in order to REJECT them in INPUT rules
1486 richard 170
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 171
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
783 richard 172
 
1962 richard 173
# Marquage des paquets qui tentent d'accéder directement au port 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
174
# Mark the direct attempts to port 55 (DNS-whitelist) in order to REJECT them in INPUT rules
1486 richard 175
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 176
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
783 richard 177
 
1962 richard 178
# Marquage des paquets qui tentent d'accéder directement au port 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
179
# Mark the direct attempts to port 56 (DNS-blackhole) in order to REJECT them in INPUT rules
1486 richard 180
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 181
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 182
 
1544 richard 183
# redirection DNS des usagers 'havp_bl' vers le port 54
184
# redirect DNS of 'havp_bl' users to port 54
1872 richard 185
$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 186
 
1544 richard 187
# redirection DNS des usagers 'havp_wl' vers le port 55
1872 richard 188
# redirect DNS of 'havp_wl' users to port 55
189
$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 190
 
2454 tom.houday 191
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
1544 richard 192
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
2355 tom.houday 193
$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 194
 
195
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
196
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1872 richard 197
$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 198
 
1544 richard 199
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
200
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1872 richard 201
$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 202
 
1544 richard 203
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 204
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
1872 richard 205
$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 206
 
1544 richard 207
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 208
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1872 richard 209
$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
210
$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 211
 
783 richard 212
# Redirection des requêtes NTP vers le serveur NTP local
213
# Redirect NTP request in local NTP server
214
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
215
 
472 richard 216
#############################
783 richard 217
#         INPUT             #
472 richard 218
#############################
871 richard 219
 
783 richard 220
# Tout passe sur loopback
221
# accept all on loopback
222
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 223
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 224
 
225
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
226
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 227
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
228
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
229
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
230
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 231
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 232
 
2454 tom.houday 233
# Si configéré, on autorise les réponses DHCP
1587 richard 234
# Allow DHCP answers if configured
235
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
236
if [[ "$public_ip_mask" == "dhcp" ]]
237
then
238
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
239
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
240
fi
871 richard 241
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
2454 tom.houday 242
# Drop broadcast & multicast on EXTIF to avoid log
1629 richard 243
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 244
 
783 richard 245
# On autorise les retours de connexions légitimes par INPUT
246
# Conntrack on INPUT
247
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 248
 
1221 richard 249
# 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 250
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 251
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 252
 
2454 tom.houday 253
# Autorisation des connexions légitimes à DansGuardian
783 richard 254
# Allow connections for DansGuardian
255
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 256
 
1486 richard 257
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
258
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
259
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
260
 
2454 tom.houday 261
# Autorisation des connexions légitimes vers tinyproxy
1486 richard 262
# Allow connections to tinyproxy
263
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
264
 
1962 richard 265
# On interdit les connexions directes au port 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
266
# Deny direct connections on port 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
267
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
268
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
791 richard 269
 
1962 richard 270
# On interdit les connexions directes au port 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
271
# Deny direct connections on port 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
272
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
273
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1364 richard 274
 
1962 richard 275
# On interdit les connexions directes au port 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
276
# Deny direct connections on port 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
277
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
278
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1472 richard 279
 
1364 richard 280
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
281
# Allow connections for DNSMASQ (with blacklist)
783 richard 282
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 283
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
783 richard 284
 
1364 richard 285
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
286
# Allow connections for DNSMASQ (with whitelist)
287
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 288
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
1364 richard 289
 
1472 richard 290
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
291
# Allow connections for DNSMASQ (blackhole mode)
292
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 293
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 294
 
783 richard 295
# Accès direct aux services internes
296
# Internal services access
2454 tom.houday 297
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
1962 richard 298
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 299
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
300
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
301
$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
302
$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 303
$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 304
$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 305
 
2454 tom.houday 306
# SSHD rules if activate
783 richard 307
if [ $SSH = on ]
520 richard 308
	then
1731 richard 309
	$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 310
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1731 richard 311
	$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 312
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 313
fi
783 richard 314
 
315
# Insertion de règles locales
316
# Here, we add local rules (i.e. VPN from Internet)
317
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
2454 tom.houday 318
	. /usr/local/etc/alcasar-iptables-local.sh
783 richard 319
fi
320
 
321
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
322
# Deny and log on INPUT from the LAN
2355 tom.houday 323
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-int -- REJECT "
783 richard 324
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
325
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
326
 
1393 richard 327
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 328
# Reject INTIF access (only when chilli is down)
2355 tom.houday 329
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 330
$IPTABLES -A INPUT -i $INTIF -j REJECT
331
 
332
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
333
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
1731 richard 334
$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 335
 
336
#############################
337
#        FORWARD            #
338
#############################
339
 
1872 richard 340
# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl
341
# Deny IPs of the SET bl_ip_blocked for the set havp_bl
2187 richard 342
$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
343
$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 344
$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 345
 
783 richard 346
# Rejet des requêtes DNS vers Internet
347
# Deny forward DNS
348
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
349
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
350
 
2184 richard 351
# Active le suivi de session
352
# Allow Conntrack
815 richard 353
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 354
 
2454 tom.houday 355
# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
2006 raphael.pi 356
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
357
if [ $nb_uamallowed != "0" ]
358
then
2454 tom.houday 359
	while read ip_allowed_line
1488 richard 360
	do
2006 raphael.pi 361
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
362
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
363
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
364
	done < /usr/local/etc/alcasar-uamallowed
365
fi
492 franck 366
 
2184 richard 367
# filtrage protocole par utilisateur (profile 1 : http, https)
368
# protocols filtering for users (profil 1 : http, https)
369
	$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
370
	$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 371
 
2184 richard 372
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
373
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 374
 
2184 richard 375
	$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
376
	$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 377
 
2184 richard 378
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
379
# protocols filtering for users (profil 3 : customized with ACC)
2006 raphael.pi 380
#profile 3 personalisables via l'ACC
2184 richard 381
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 382
while read svc_line
383
do
384
	svc_on=`echo $svc_line|cut -b1`
385
	if [ $svc_on != "#" ]
386
	then	
387
		svc_name=`echo $svc_line|cut -d" " -f1`
388
		svc_port=`echo $svc_line|cut -d" " -f2`
389
		if [ $svc_name = "icmp" ]
390
		then
2184 richard 391
			svc_icmp="on"
2006 raphael.pi 392
		else
2184 richard 393
			if [ "$custom_tcp_protocols_list" == "" ]
394
			then
395
				custom_tcp_protocols_list=$svc_port
396
			else
397
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
398
			fi
399
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
400
			if [ $udp_svc = "1" ] # udp service exist
401
			then
402
				if [ "$custom_udp_protocols_list" == "" ]
403
				then
404
					custom_udp_protocols_list=$svc_port
405
				else
406
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
407
				fi
408
			fi
1488 richard 409
		fi
2006 raphael.pi 410
	fi
411
done < /usr/local/etc/alcasar-services
2184 richard 412
	if [ "$custom_tcp_protocols_list" == "" ]
413
	then
414
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
415
	else
416
		if [ "$svc_icmp" != "on" ]
417
		then
418
			$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
419
		fi
420
		$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
421
		$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
422
	fi
1488 richard 423
 
2454 tom.houday 424
# journalisation et autorisation des connections sortant du LAN
476 richard 425
# Allow forward connections with log
1159 crox53 426
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 427
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 428
 
783 richard 429
#############################
430
#         OUTPUT            #
431
#############################
1159 crox53 432
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
433
# Everything is allowed but traffic through outside network interface
2213 richard 434
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 435
 
2454 tom.houday 436
# Si configéré, on autorise les requêtes DHCP
1587 richard 437
# Allow DHCP requests if configured
438
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
439
if [[ "$public_ip_mask" == "dhcp" ]]
440
then
441
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
442
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
443
fi
444
 
2454 tom.houday 445
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 446
# Allow DNS requests to identified DNS servers
447
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 448
 
615 richard 449
# On autorise les requêtes HTTP sortantes
498 richard 450
# HTTP requests are allowed
1159 crox53 451
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 452
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 453
 
2259 tom.houday 454
# On autorise les requêtes HTTPS sortantes
455
# HTTPS requests are allowed
456
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
457
 
1862 raphael.pi 458
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
459
# RSYNC requests are allowed (to update BL of Toulouse)
460
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
461
 
2454 tom.houday 462
# On autorise les requêtes FTP
784 richard 463
# FTP requests are allowed
1705 richard 464
modprobe nf_conntrack_ftp
784 richard 465
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 466
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 467
 
2454 tom.houday 468
# On autorise les requêtes NTP
498 richard 469
# NTP requests are allowed
470
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 471
 
2454 tom.houday 472
# On autorise les requêtes ICMP (ping)
503 richard 473
# ICMP (ping) requests are allowed
474
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 475
 
615 richard 476
# On autorise les requêtes LDAP si un serveur externe est configué
477
# LDAP requests are allowed if an external server is declared
478
if [ $LDAP = on ]
479
	then
694 franck 480
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
481
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 482
fi
783 richard 483
 
484
#############################
485
#       POSTROUTING         #
486
#############################
498 richard 487
# Traduction dynamique d'adresse en sortie
476 richard 488
# Dynamic NAT on EXTIF
1 root 489
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
490
 
476 richard 491
# End of script