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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2688 2019-01-18 23:15:49Z lucas.echard $
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}
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PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
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private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
22
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
783 richard 23
PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
1469 richard 24
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
1585 richard 25
if [[ "$public_ip_mask" == "dhcp" ]]
26
then
27
	PTN="\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\/([012]?[0-9]|3[0-2])\b"
1587 richard 28
	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`
1585 richard 29
fi
783 richard 30
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
1588 richard 31
dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`
32
dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`
615 richard 33
dns1=${dns1:=208.67.220.220}
34
dns2=${dns2:=208.67.222.222}
1585 richard 35
DNSSERVERS="$dns1,$dns2"						# first and second public DNS servers
2688 lucas.echa 36
INT_DNS_IP=`grep INT_DNS_IP $CONF_FILE|cut -d"=" -f2`			# Adresse du serveur DNS interne
37
INT_DNS_ACTIVE=`grep INT_DNS_ACTIVE $CONF_FILE|cut -d"=" -f2`	# Activation de la redirection DNS interne
1332 richard 38
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1932 richard 39
WL_IP_CAT="/usr/local/share/iptables-wl-enabled"			# categories files of the WhiteListed IP
2454 tom.houday 40
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set
1364 richard 41
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
1469 richard 42
SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
615 richard 43
SSH=${SSH:=off}
1469 richard 44
SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
1063 richard 45
SSH_ADMIN_FROM=${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 46
IPTABLES="/sbin/iptables"
2521 armand.ito 47
IP_REHABILITEES="/etc/e2guardian/lists/exceptioniplist"		# Rehabilitated IP
2485 franck 48
SITE_DIRECT="/usr/local/etc/alcasar-site-direct"			# Site Direct (no havp and no filtrage) for user BL
1 root 49
 
2688 lucas.echa 50
# Allow requests to internal DNS if activated
51
if [ "$INT_DNS_ACTIVE" = "on" ]
52
then
53
	DNSSERVERS="$DNSSERVERS,$INT_DNS_IP"
54
fi
55
 
1364 richard 56
# Sauvegarde des SET des utilisateurs connectés si ils existent
57
# Saving SET of connected users if it exists
1867 raphael.pi 58
ipset list not_filtered 1>/dev/null 2>&1
1364 richard 59
if [ $? -eq 0 ];
60
then
1867 raphael.pi 61
	ipset save not_filtered > $TMP_users_set_save
1872 richard 62
	ipset save havp >> $TMP_users_set_save
63
	ipset save havp_bl >> $TMP_users_set_save
64
	ipset save havp_wl >> $TMP_users_set_save
2006 raphael.pi 65
	ipset save proto_0 >> $TMP_users_set_save
66
	ipset save proto_1 >> $TMP_users_set_save
67
	ipset save proto_2 >> $TMP_users_set_save
68
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 69
fi
70
 
2668 rexy 71
# Chargement de la sonde NetFlow (module noyau ipt_NETFLOW)
1291 richard 72
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 73
modprobe ipt_NETFLOW destination=127.0.0.1:2055
74
 
498 richard 75
# Effacement des règles existantes
476 richard 76
# Flush all existing rules
1 root 77
$IPTABLES -F
78
$IPTABLES -t nat -F
79
$IPTABLES -t mangle -F
80
$IPTABLES -F INPUT
81
$IPTABLES -F FORWARD
82
$IPTABLES -F OUTPUT
83
 
498 richard 84
# Suppression des chaines utilisateurs sur les tables filter et nat
85
# Flush non default rules on filter and nat tables
86
$IPTABLES -X
87
$IPTABLES -t nat -X
88
 
89
# Stratégies par défaut
476 richard 90
# Default policies
1 root 91
$IPTABLES -P INPUT DROP
92
$IPTABLES -P FORWARD DROP
498 richard 93
$IPTABLES -P OUTPUT DROP
1 root 94
$IPTABLES -t nat -P PREROUTING ACCEPT
95
$IPTABLES -t nat -P POSTROUTING ACCEPT
96
$IPTABLES -t nat -P OUTPUT ACCEPT
97
 
1484 richard 98
 
99
#############################
100
#          IPSET            #
101
#############################
102
 
1291 richard 103
# destruction de tous les SET
1332 richard 104
# destroy all SET
1876 raphael.pi 105
ipset flush
1291 richard 106
ipset destroy
1855 raphael.pi 107
 
1484 richard 108
###### BL set  ###########
109
# Calcul de la taille / Compute the length
1932 richard 110
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 111
# Chargement / loading
1867 raphael.pi 112
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 113
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 114
do
1364 richard 115
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 116
done
1364 richard 117
ipset -! restore < $TMP_set_save
118
rm -f $TMP_set_save
1484 richard 119
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 120
for ip in $(cat $IP_REHABILITEES)
121
do
2688 lucas.echa 122
	ipset -q del bl_ip_blocked $ip
1339 richard 123
done
124
 
2485 franck 125
# rajout exception havp_bl --> Site en direct pour les Utilisateurs filtrés
126
ipset create site_direct hash:net hashsize 1024
127
for site in $(cat $SITE_DIRECT)
128
do
2688 lucas.echa 129
    ipset add site_direct $site
2485 franck 130
done
131
 
1484 richard 132
###### WL set  ###########
2688 lucas.echa 133
# taille fixe, car peuplé par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 134
wl_set_length=65536
1484 richard 135
# Chargement Loading
1867 raphael.pi 136
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 137
#get ip-wl files from ACC
1932 richard 138
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 139
do
1932 richard 140
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 141
done
1364 richard 142
ipset -! restore < $TMP_set_save
143
rm -f $TMP_set_save
144
 
2454 tom.houday 145
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 146
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 147
if [ -e $TMP_users_set_save ];
148
then
149
	ipset -! restore < $TMP_users_set_save
150
	rm -f $TMP_users_set_save
151
else
2386 tom.houday 152
	ipset create not_filtered hash:ip hashsize 1024
153
	ipset create havp hash:ip hashsize 1024
154
	ipset create havp_bl hash:ip hashsize 1024
155
	ipset create havp_wl hash:ip hashsize 1024
2668 rexy 156
	# pour les filtrages de protocole par utilisateur / For network protocols filtering by user
2386 tom.houday 157
	ipset create proto_0 hash:ip hashsize 1024
158
	ipset create proto_1 hash:ip hashsize 1024
159
	ipset create proto_2 hash:ip hashsize 1024
160
	ipset create proto_3 hash:ip hashsize 1024
1364 richard 161
fi
162
 
472 richard 163
#############################
783 richard 164
#       PREROUTING          #
472 richard 165
#############################
1827 raphael.pi 166
 
2521 armand.ito 167
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (E2Guardian) pour pouvoir les rejeter en INPUT
168
# Mark (and log) the direct attempts to TCP port 8090 (e2guardian) in order to REJECT them in INPUT rules
2355 tom.houday 169
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j NFLOG --nflog-group 1 --nflog-prefix "RULE direct-proxy -- DENY "
783 richard 170
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 171
 
1486 richard 172
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
1962 richard 173
# Mark (and log) the direct attempts to TCP port 8090 (tinyproxy) in order to REJECT them in INPUT rules
2355 tom.houday 174
$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 175
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
176
 
1962 richard 177
# Marquage des paquets qui tentent d'accéder directement au port 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
178
# Mark the direct attempts to port 54 (DNS-blacklist) in order to REJECT them in INPUT rules
1486 richard 179
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 180
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
783 richard 181
 
1962 richard 182
# Marquage des paquets qui tentent d'accéder directement au port 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
183
# Mark the direct attempts to port 55 (DNS-whitelist) in order to REJECT them in INPUT rules
1486 richard 184
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 185
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
783 richard 186
 
1962 richard 187
# Marquage des paquets qui tentent d'accéder directement au port 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
188
# Mark the direct attempts to port 56 (DNS-blackhole) in order to REJECT them in INPUT rules
1486 richard 189
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 190
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 191
 
2517 rexy 192
# redirection DNS des usagers 'havp_bl' vers le port local 54 (en évitant le contournement)
193
# redirect DNS of 'havp_bl' users to the local port 54 (avoiding bypass)
194
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -p udp --dport domain -j REDIRECT --to-port 54
195
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -p tcp --dport domain -j REDIRECT --to-port 54
1393 richard 196
 
2517 rexy 197
# redirection DNS des usagers 'havp_wl' vers le port local 55 (en évitant le contournement)
198
# redirect DNS of 'havp_wl' users to the local port 55 (avoiding bypass)
199
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src -p udp --dport domain -j REDIRECT --to-port 55
200
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl src -p tcp --dport domain -j REDIRECT --to-port 55
1364 richard 201
 
2517 rexy 202
# redirection des requêtes DNS de contournement vers le port local 53
203
# redirect of bypass DNS requests to the local port 53
204
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 53
205
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p tcp --dport domain -j REDIRECT --to-port 53
206
 
2454 tom.houday 207
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
1544 richard 208
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
2496 tom.houday 209
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src ! -d $PRIVATE_IP -p tcp --dport http -m conntrack --ctstate NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE F_http -- ACCEPT "
1544 richard 210
 
211
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
212
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1872 richard 213
$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 214
 
1544 richard 215
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
216
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1872 richard 217
$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 218
 
2521 armand.ito 219
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers E2Guardian
220
# Redirect outbound HTTP requests of "BL" users to E2Guardian (transparent proxy)
2485 franck 221
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport http -j REDIRECT --to-port 8080
2668 rexy 222
 
1544 richard 223
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 224
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1872 richard 225
$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
226
$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 227
 
783 richard 228
# Redirection des requêtes NTP vers le serveur NTP local
229
# Redirect NTP request in local NTP server
230
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
231
 
472 richard 232
#############################
783 richard 233
#         INPUT             #
472 richard 234
#############################
871 richard 235
 
783 richard 236
# Tout passe sur loopback
237
# accept all on loopback
238
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 239
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 240
 
241
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
242
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 243
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
244
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
245
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
246
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
2496 tom.houday 247
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m conntrack --ctstate NEW -j DROP
498 richard 248
 
2454 tom.houday 249
# Si configéré, on autorise les réponses DHCP
1587 richard 250
# Allow DHCP answers if configured
251
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
252
if [[ "$public_ip_mask" == "dhcp" ]]
253
then
254
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
255
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
256
fi
871 richard 257
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
2454 tom.houday 258
# Drop broadcast & multicast on EXTIF to avoid log
1629 richard 259
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 260
 
783 richard 261
# On autorise les retours de connexions légitimes par INPUT
262
# Conntrack on INPUT
2496 tom.houday 263
$IPTABLES -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
373 richard 264
 
2521 armand.ito 265
# On interdit les connexions directes au port utilisé par E2Guardian (8080). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
266
# Deny direct connections on E2Guardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 267
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 268
 
2521 armand.ito 269
# Autorisation des connexions légitimes à E2Guardian
270
# Allow connections for E2Guardian
2496 tom.houday 271
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m conntrack --ctstate NEW --syn -j ACCEPT
373 richard 272
 
1486 richard 273
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
274
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
275
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
276
 
2454 tom.houday 277
# Autorisation des connexions légitimes vers tinyproxy
1486 richard 278
# Allow connections to tinyproxy
2496 tom.houday 279
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m conntrack --ctstate NEW --syn -j ACCEPT
1486 richard 280
 
1962 richard 281
# On interdit les connexions directes au port 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
282
# Deny direct connections on port 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
283
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
284
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
791 richard 285
 
1962 richard 286
# On interdit les connexions directes au port 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
287
# Deny direct connections on port 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
288
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
289
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1364 richard 290
 
1962 richard 291
# On interdit les connexions directes au port 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
292
# Deny direct connections on port 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
293
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
294
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1472 richard 295
 
2688 lucas.echa 296
# autorisation des connexion légitime à Unbound (avec blacklist)
297
# Allow connections for Unbound (with blacklist)
783 richard 298
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 299
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
783 richard 300
 
2688 lucas.echa 301
# autorisation des connexion légitime à Unbound (avec whitelist)
302
# Allow connections for Unbound (with whitelist)
1364 richard 303
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 304
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
1364 richard 305
 
2688 lucas.echa 306
# autorisation des connexion légitime à Unbound (mode blackhole)
307
# Allow connections for Unbound (blackhole mode)
1472 richard 308
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 309
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 310
 
783 richard 311
# Accès direct aux services internes
312
# Internal services access
2454 tom.houday 313
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
1962 richard 314
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 315
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
316
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
317
$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
318
$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 319
$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 320
$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 321
 
2668 rexy 322
# Accès au serveur SSHD si activé
323
# SSHD server access if enabled
783 richard 324
if [ $SSH = on ]
520 richard 325
	then
2496 tom.houday 326
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m conntrack --ctstate NEW -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-LAN -- ACCEPT"
783 richard 327
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
2496 tom.houday 328
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m conntrack --ctstate NEW --syn -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT"
329
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m conntrack --ctstate NEW -j ACCEPT
520 richard 330
fi
783 richard 331
 
332
# Insertion de règles locales
333
# Here, we add local rules (i.e. VPN from Internet)
334
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
2454 tom.houday 335
	. /usr/local/etc/alcasar-iptables-local.sh
783 richard 336
fi
337
 
338
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
339
# Deny and log on INPUT from the LAN
2496 tom.houday 340
$IPTABLES -A INPUT -i $TUNIF -m conntrack --ctstate NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-int -- REJECT "
783 richard 341
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
342
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
343
 
1393 richard 344
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 345
# Reject INTIF access (only when chilli is down)
2355 tom.houday 346
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 347
$IPTABLES -A INPUT -i $INTIF -j REJECT
348
 
349
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
350
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
2496 tom.houday 351
$IPTABLES -A INPUT -i $EXTIF -m conntrack --ctstate NEW -j NFLOG --nflog-group 3 --nflog-threshold 10 --nflog-prefix "RULE rej-ext -- DROP"
783 richard 352
 
353
#############################
354
#        FORWARD            #
355
#############################
356
 
1872 richard 357
# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl
358
# Deny IPs of the SET bl_ip_blocked for the set havp_bl
2187 richard 359
$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
360
$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 361
$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 362
 
2184 richard 363
# Active le suivi de session
364
# Allow Conntrack
2496 tom.houday 365
$IPTABLES -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
790 richard 366
 
2668 rexy 367
# Compute uamallowed IP (ie : IP address of equipments connected between ALCASAR and router like DMZ, own servers, etc.)
2006 raphael.pi 368
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
369
if [ $nb_uamallowed != "0" ]
370
then
2454 tom.houday 371
	while read ip_allowed_line
1488 richard 372
	do
2006 raphael.pi 373
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
2496 tom.houday 374
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j NETFLOW
375
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j ACCEPT
2006 raphael.pi 376
	done < /usr/local/etc/alcasar-uamallowed
377
fi
492 franck 378
 
2184 richard 379
# filtrage protocole par utilisateur (profile 1 : http, https)
380
# protocols filtering for users (profil 1 : http, https)
2496 tom.houday 381
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports http,https -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset
382
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports http,https -m conntrack --ctstate NEW -j REJECT --reject-with icmp-port-unreachable
2006 raphael.pi 383
 
2184 richard 384
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
385
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 386
 
2496 tom.houday 387
	$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 conntrack --ctstate NEW -j REJECT --reject-with tcp-reset
388
	$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 conntrack --ctstate NEW -j REJECT --reject-with icmp-port-unreachable
2006 raphael.pi 389
 
2184 richard 390
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
391
# protocols filtering for users (profil 3 : customized with ACC)
392
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 393
while read svc_line
394
do
395
	svc_on=`echo $svc_line|cut -b1`
396
	if [ $svc_on != "#" ]
2688 lucas.echa 397
	then
2006 raphael.pi 398
		svc_name=`echo $svc_line|cut -d" " -f1`
399
		svc_port=`echo $svc_line|cut -d" " -f2`
400
		if [ $svc_name = "icmp" ]
401
		then
2184 richard 402
			svc_icmp="on"
2006 raphael.pi 403
		else
2184 richard 404
			if [ "$custom_tcp_protocols_list" == "" ]
405
			then
406
				custom_tcp_protocols_list=$svc_port
407
			else
408
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
409
			fi
410
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
411
			if [ $udp_svc = "1" ] # udp service exist
412
			then
413
				if [ "$custom_udp_protocols_list" == "" ]
414
				then
415
					custom_udp_protocols_list=$svc_port
416
				else
417
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
418
				fi
419
			fi
1488 richard 420
		fi
2006 raphael.pi 421
	fi
422
done < /usr/local/etc/alcasar-services
2184 richard 423
	if [ "$custom_tcp_protocols_list" == "" ]
424
	then
425
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
426
	else
427
		if [ "$svc_icmp" != "on" ]
428
		then
429
			$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
430
		fi
2496 tom.houday 431
		$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 conntrack --ctstate NEW -j REJECT --reject-with tcp-reset
432
		$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 conntrack --ctstate NEW -j REJECT --reject-with icmp-port-unreachable
2184 richard 433
	fi
1488 richard 434
 
2674 lucas.echa 435
# Blocage des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL
436
# Block 'havp_wl' users who want IP not in the WL
437
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_wl src -m set ! --match-set wl_ip_allowed dst -j DROP
438
 
2454 tom.houday 439
# journalisation et autorisation des connections sortant du LAN
476 richard 440
# Allow forward connections with log
2496 tom.houday 441
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j NETFLOW
442
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j ACCEPT
1 root 443
 
783 richard 444
#############################
445
#         OUTPUT            #
446
#############################
2468 richard 447
# On laisse tout sortir à l'exception de la carte externe (cf ci-dessous)
448
# Everything is allowed apart from outside network interface (see bellow)
2213 richard 449
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 450
 
2468 richard 451
# Si configuré, on autorise les requêtes DHCP
1587 richard 452
# Allow DHCP requests if configured
453
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
454
if [[ "$public_ip_mask" == "dhcp" ]]
455
then
456
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
457
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
458
fi
459
 
2454 tom.houday 460
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 461
# Allow DNS requests to identified DNS servers
2496 tom.houday 462
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m conntrack --ctstate NEW -j ACCEPT
783 richard 463
 
2521 armand.ito 464
# On autorise les requêtes HTTP avec log Netflow (en provenance de E2guardian)
2668 rexy 465
# HTTP requests are allowed with netflow log (from E2guardian)
1159 crox53 466
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 467
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 468
 
2259 tom.houday 469
# On autorise les requêtes HTTPS sortantes
470
# HTTPS requests are allowed
471
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
472
 
1862 raphael.pi 473
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
2468 richard 474
# RSYNC requests are allowed (update of Toulouse BL)
1862 raphael.pi 475
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
476
 
2454 tom.houday 477
# On autorise les requêtes FTP
784 richard 478
# FTP requests are allowed
1705 richard 479
modprobe nf_conntrack_ftp
2642 rexy 480
$IPTABLES -t raw -A OUTPUT -p tcp --dport ftp -j CT --helper ftp
784 richard 481
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
2496 tom.houday 482
$IPTABLES -A OUTPUT -o $EXTIF -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
784 richard 483
 
2454 tom.houday 484
# On autorise les requêtes NTP
498 richard 485
# NTP requests are allowed
486
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 487
 
2454 tom.houday 488
# On autorise les requêtes ICMP (ping)
503 richard 489
# ICMP (ping) requests are allowed
490
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 491
 
2468 richard 492
# On autorise les requêtes LDAP
493
# LDAP requests are allowed
2496 tom.houday 494
$IPTABLES -A OUTPUT -o $EXTIF -p tcp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
495
$IPTABLES -A OUTPUT -o $EXTIF -p udp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
783 richard 496
 
497
#############################
498
#       POSTROUTING         #
499
#############################
498 richard 500
# Traduction dynamique d'adresse en sortie
476 richard 501
# Dynamic NAT on EXTIF
1 root 502
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
503
 
2495 tom.houday 504
 
505
#############################
506
#          FAIL2BAN         #
507
#############################
508
# Reload Fail2Ban
2530 lucas.echa 509
if systemctl -q is-active fail2ban; then
510
	/usr/bin/fail2ban-client ping &>/dev/null && /usr/bin/fail2ban-client -q reload
511
fi