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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2006 2016-07-22 13:07:10Z raphael.pion $
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
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= $CONF_FILE|cut -d"=" -f2`
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private_ip_mask=${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= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
1585 richard 25
if [[ "$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= $CONF_FILE|cut -d"=" -f2`
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dns1=${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
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
1867 raphael.pi 61
	ipset save not_auth_yet >> $TMP_users_set_save
62
	ipset save users_list >> $TMP_users_set_save
2006 raphael.pi 63
	ipset save proto_0 >> $TMP_users_set_save
64
	ipset save proto_1 >> $TMP_users_set_save
65
	ipset save proto_2 >> $TMP_users_set_save
66
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 67
fi
68
 
1291 richard 69
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 70
modprobe ipt_NETFLOW destination=127.0.0.1:2055
71
 
498 richard 72
# Effacement des règles existantes
476 richard 73
# Flush all existing rules
1 root 74
$IPTABLES -F
75
$IPTABLES -t nat -F
76
$IPTABLES -t mangle -F
77
$IPTABLES -F INPUT
78
$IPTABLES -F FORWARD
79
$IPTABLES -F OUTPUT
80
 
498 richard 81
# Suppression des chaines utilisateurs sur les tables filter et nat
82
# Flush non default rules on filter and nat tables
83
$IPTABLES -X
84
$IPTABLES -t nat -X
85
 
86
# Stratégies par défaut
476 richard 87
# Default policies
1 root 88
$IPTABLES -P INPUT DROP
89
$IPTABLES -P FORWARD DROP
498 richard 90
$IPTABLES -P OUTPUT DROP
1 root 91
$IPTABLES -t nat -P PREROUTING ACCEPT
92
$IPTABLES -t nat -P POSTROUTING ACCEPT
93
$IPTABLES -t nat -P OUTPUT ACCEPT
94
 
1484 richard 95
 
96
#############################
97
#          IPSET            #
98
#############################
99
 
1291 richard 100
# destruction de tous les SET
1332 richard 101
# destroy all SET
1876 raphael.pi 102
ipset flush
1291 richard 103
ipset destroy
1855 raphael.pi 104
 
1484 richard 105
###### BL set  ###########
106
# Calcul de la taille / Compute the length
1932 richard 107
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 108
# Chargement / loading
1867 raphael.pi 109
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 110
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 111
do
1364 richard 112
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 113
done
1364 richard 114
ipset -! restore < $TMP_set_save
115
rm -f $TMP_set_save
1484 richard 116
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 117
for ip in $(cat $IP_REHABILITEES)
118
do
1867 raphael.pi 119
	ipset del bl_ip_blocked $ip
1339 richard 120
done
121
 
1484 richard 122
###### WL set  ###########
1932 richard 123
# taille fixe, car peupler par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 124
wl_set_length=65536
1484 richard 125
# Chargement Loading
1867 raphael.pi 126
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 127
#get ip-wl files from ACC
1932 richard 128
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 129
do
1932 richard 130
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 131
done
1364 richard 132
ipset -! restore < $TMP_set_save
133
rm -f $TMP_set_save
134
 
135
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET 
1377 richard 136
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 137
if [ -e $TMP_users_set_save ];
138
then
139
	ipset -! restore < $TMP_users_set_save
140
	rm -f $TMP_users_set_save
141
else
1867 raphael.pi 142
	ipset create not_filtered hash:net hashsize 1024
1872 richard 143
	ipset create havp hash:net hashsize 1024
144
	ipset create havp_bl hash:net hashsize 1024
145
	ipset create havp_wl hash:net hashsize 1024
1818 raphael.pi 146
	#utilisé pour l'interception des utilisateurs non authentifiés au réseau
147
	#used for intercepting users not connected to the network
1867 raphael.pi 148
	ipset create not_auth_yet hash:net hashsize 1024
149
	ipset create users_list list:set
1872 richard 150
	ipset add users_list havp
151
	ipset add users_list havp_wl
152
	ipset add users_list havp_bl
1867 raphael.pi 153
	ipset add users_list not_filtered
154
	ipset add users_list not_auth_yet
2006 raphael.pi 155
	#pour les filtrages de protocole par utilisateur
156
	ipset create proto_0 hash:net hashsize 1024
157
	ipset create proto_1 hash:net hashsize 1024
158
	ipset create proto_2 hash:net hashsize 1024
159
	ipset create proto_3 hash:net hashsize 1024
1364 richard 160
fi
161
 
472 richard 162
#############################
783 richard 163
#       PREROUTING          #
472 richard 164
#############################
1827 raphael.pi 165
 
166
# Redirection des requetes DNS des utilisateurs non connectés dans le DNS-Blackhole
167
# Redirect users not connected DNS requests in DNS-Blackhole
1867 raphael.pi 168
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set ! --match-set users_list src -d $PRIVATE_IP -p tcp --dport domain -j REDIRECT --to-port 56
169
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set ! --match-set users_list src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 56
1827 raphael.pi 170
 
171
 
1453 franck 172
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
173
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 174
#$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 175
 
1486 richard 176
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
1962 richard 177
# Mark (and log) the direct attempts to TCP port 8090 (dansguardian) in order to REJECT them in INPUT rules
1731 richard 178
$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 179
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 180
 
1486 richard 181
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
1962 richard 182
# Mark (and log) the direct attempts to TCP port 8090 (tinyproxy) in order to REJECT them in INPUT rules
1704 richard 183
$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 184
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
185
 
1962 richard 186
# Marquage des paquets qui tentent d'accéder directement au port 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
187
# Mark the direct attempts to port 54 (DNS-blacklist) in order to REJECT them in INPUT rules
1486 richard 188
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 189
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
783 richard 190
 
1962 richard 191
# Marquage des paquets qui tentent d'accéder directement au port 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
192
# Mark the direct attempts to port 55 (DNS-whitelist) in order to REJECT them in INPUT rules
1486 richard 193
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 194
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
783 richard 195
 
1962 richard 196
# Marquage des paquets qui tentent d'accéder directement au port 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
197
# Mark the direct attempts to port 56 (DNS-blackhole) in order to REJECT them in INPUT rules
1486 richard 198
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 199
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 200
 
1544 richard 201
# redirection DNS des usagers 'havp_bl' vers le port 54
202
# redirect DNS of 'havp_bl' users to port 54
1872 richard 203
$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 204
 
1544 richard 205
# redirection DNS des usagers 'havp_wl' vers le port 55
1872 richard 206
# redirect DNS of 'havp_wl' users to port 55
207
$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 208
 
1544 richard 209
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow. 
210
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
1872 richard 211
$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 212
 
213
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
214
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1872 richard 215
$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 216
 
1544 richard 217
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
218
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1872 richard 219
$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 220
 
1544 richard 221
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 222
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
1872 richard 223
$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 224
 
1544 richard 225
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 226
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1872 richard 227
$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
228
$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 229
 
783 richard 230
# Redirection des requêtes NTP vers le serveur NTP local
231
# Redirect NTP request in local NTP server
232
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
233
 
472 richard 234
#############################
783 richard 235
#         INPUT             #
472 richard 236
#############################
871 richard 237
 
783 richard 238
# Tout passe sur loopback
239
# accept all on loopback
240
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 241
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 242
 
243
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
244
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 245
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
246
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
247
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
248
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 249
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 250
 
1587 richard 251
# Si configéré, on autorise les réponses DHCP 
252
# Allow DHCP answers if configured
253
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
254
if [[ "$public_ip_mask" == "dhcp" ]]
255
then
256
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
257
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
258
fi
871 richard 259
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
260
# Drop broadcast & multicast on EXTIF to avoid log 
1629 richard 261
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 262
 
783 richard 263
# On autorise les retours de connexions légitimes par INPUT
264
# Conntrack on INPUT
265
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 266
 
1221 richard 267
# 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 268
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 269
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 270
 
783 richard 271
# Autorisation des connexions légitimes à DansGuardian 
272
# Allow connections for DansGuardian
273
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 274
 
1486 richard 275
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
276
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
277
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
278
 
279
# Autorisation des connexions légitimes vers tinyproxy 
280
# Allow connections to tinyproxy
281
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
282
 
1962 richard 283
# On interdit les connexions directes au port 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
284
# Deny direct connections on port 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
285
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
286
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
791 richard 287
 
1962 richard 288
# On interdit les connexions directes au port 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
289
# Deny direct connections on port 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
290
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
291
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1364 richard 292
 
1962 richard 293
# On interdit les connexions directes au port 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
294
# Deny direct connections on port 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
295
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
296
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 3 -j REJECT --reject-with tcp-reset
1472 richard 297
 
1364 richard 298
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
299
# Allow connections for DNSMASQ (with blacklist)
783 richard 300
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 301
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
783 richard 302
 
1364 richard 303
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
304
# Allow connections for DNSMASQ (with whitelist)
305
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 306
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
1364 richard 307
 
1472 richard 308
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
309
# Allow connections for DNSMASQ (blackhole mode)
310
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 311
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 312
 
783 richard 313
# Accès direct aux services internes
314
# Internal services access
1962 richard 315
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS 
316
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 317
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
318
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
319
$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
320
$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
321
$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
322
$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 323
 
324
# SSHD rules if activate 
325
if [ $SSH = on ]
520 richard 326
	then
1731 richard 327
	$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 328
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1731 richard 329
	$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 330
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 331
fi
783 richard 332
 
333
# Insertion de règles locales
334
# Here, we add local rules (i.e. VPN from Internet)
335
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
336
        . /usr/local/etc/alcasar-iptables-local.sh
337
fi
338
 
339
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
340
# Deny and log on INPUT from the LAN
1704 richard 341
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j NFLOG --nflog-prefix "RULE rej-int -- REJECT "
783 richard 342
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
343
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
344
 
1393 richard 345
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 346
# Reject INTIF access (only when chilli is down)
1704 richard 347
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 348
$IPTABLES -A INPUT -i $INTIF -j REJECT
349
 
350
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
351
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
1731 richard 352
$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 353
 
354
#############################
355
#        FORWARD            #
356
#############################
357
 
1872 richard 358
# Blocage des IPs du SET bl_ip_blocked pour le SET havp_bl
359
# Deny IPs of the SET bl_ip_blocked for the set havp_bl
360
$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-port-unreachable
361
$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-port-unreachable
362
$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 363
 
783 richard 364
# Rejet des requêtes DNS vers Internet
365
# Deny forward DNS
366
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
367
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
368
 
815 richard 369
# Autorisation des retours de connexions légitimes
370
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 371
 
2006 raphael.pi 372
# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...) 
373
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
374
if [ $nb_uamallowed != "0" ]
375
then
376
	while read ip_allowed_line 
1488 richard 377
	do
2006 raphael.pi 378
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
379
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NFLOG --nflog-prefix "RULE IP-allowed -- ACCEPT "
380
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
381
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
382
	done < /usr/local/etc/alcasar-uamallowed
383
fi
492 franck 384
 
2006 raphael.pi 385
 
386
 
387
#filtrage protocole par utilisateur (on autorise le HTTP pour tous)
388
#profile 1 : HTTP/S only
389
for proto in $(echo http https)
390
do
391
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $proto -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-P1$proto -- ACCEPT "
392
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $proto -m state --state NEW -j NETFLOW
393
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $proto -m state --state NEW -j ACCEPT
394
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p udp --dport $proto -m state --state NEW -j NFLOG --nflog-prefix "RULE F_UDP-P1$proto -- ACCEPT "
395
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p udp --dport $proto -m state --state NEW -j NETFLOW
396
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p udp --dport $proto -m state --state NEW -j ACCEPT
397
done
398
 
399
#profile 2 : HTTP/S, POP3S, IMAP/S, FTP, SSH/SFTP
400
for proto in $(echo http https pop3 pop3s imap imaps ftp sftp ssh)
401
do
402
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $proto -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-P2$proto -- ACCEPT "
403
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $proto -m state --state NEW -j NETFLOW
404
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $proto -m state --state NEW -j ACCEPT
405
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p udp --dport $proto -m state --state NEW -j NFLOG --nflog-prefix "RULE F_UDP-P2$proto -- ACCEPT "
406
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p udp --dport $proto -m state --state NEW -j NETFLOW
407
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p udp --dport $proto -m state --state NEW -j ACCEPT
408
done
409
 
410
#profile 3 personalisables via l'ACC
411
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-P3http -- ACCEPT "
412
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NETFLOW
413
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ACCEPT
414
while read svc_line
415
do
416
	svc_on=`echo $svc_line|cut -b1`
417
	if [ $svc_on != "#" ]
418
	then	
419
		svc_name=`echo $svc_line|cut -d" " -f1`
420
		svc_port=`echo $svc_line|cut -d" " -f2`
421
		if [ $svc_name = "icmp" ]
422
		then
423
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
424
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT 
425
		else
426
 
427
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-P3$svc_name -- ACCEPT "
428
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
429
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
430
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NFLOG --nflog-prefix "RULE F_UDP-P3$svc_name -- ACCEPT "
431
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
432
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
1488 richard 433
		fi
2006 raphael.pi 434
	fi
435
done < /usr/local/etc/alcasar-services
1488 richard 436
 
2006 raphael.pi 437
# Rejet explicite des autres protocoles pour P1, P2, P3 et les autres
438
# reject the others protocols for P1,P2, P3 and other
439
$IPTABLES -A FORWARD -i $TUNIF -m set ! --match-set proto_0 src -j NFLOG --nflog-prefix "RULE F_filterP1 -- REJECT "
440
$IPTABLES -A FORWARD -i $TUNIF -m set ! --match-set proto_0 src -p tcp -j REJECT --reject-with tcp-reset
441
$IPTABLES -A FORWARD -i $TUNIF -m set ! --match-set proto_0 src -p udp -j REJECT --reject-with icmp-port-unreachable
442
$IPTABLES -A FORWARD -i $TUNIF -m set ! --match-set proto_0 src -p icmp -j REJECT 
443
 
444
 
445
 
498 richard 446
# Autorisation des connections sortant du LAN  
476 richard 447
# Allow forward connections with log
1221 richard 448
#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
1159 crox53 449
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 450
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 451
 
783 richard 452
#############################
453
#         OUTPUT            #
454
#############################
1159 crox53 455
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
456
# Everything is allowed but traffic through outside network interface
498 richard 457
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 458
 
1587 richard 459
# Si configéré, on autorise les requêtes DHCP 
460
# Allow DHCP requests if configured
461
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
462
if [[ "$public_ip_mask" == "dhcp" ]]
463
then
464
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
465
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
466
fi
467
 
503 richard 468
# On autorise les requêtes DNS vers les serveurs DNS identifiés 
498 richard 469
# Allow DNS requests to identified DNS servers
470
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 471
 
615 richard 472
# On autorise les requêtes HTTP sortantes
498 richard 473
# HTTP requests are allowed
1159 crox53 474
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 475
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 476
 
1862 raphael.pi 477
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
478
# RSYNC requests are allowed (to update BL of Toulouse)
479
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
480
 
784 richard 481
# On autorise les requêtes FTP 
482
# FTP requests are allowed
1705 richard 483
modprobe nf_conntrack_ftp
784 richard 484
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 485
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 486
 
615 richard 487
# On autorise les requêtes NTP 
498 richard 488
# NTP requests are allowed
489
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 490
 
503 richard 491
# On autorise les requêtes ICMP (ping) 
492
# ICMP (ping) requests are allowed
493
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 494
 
615 richard 495
# On autorise les requêtes LDAP si un serveur externe est configué
496
# LDAP requests are allowed if an external server is declared
497
if [ $LDAP = on ]
498
	then
694 franck 499
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
500
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 501
fi
783 richard 502
 
503
#############################
504
#       POSTROUTING         #
505
#############################
498 richard 506
# Traduction dynamique d'adresse en sortie
476 richard 507
# Dynamic NAT on EXTIF
1 root 508
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
509
 
476 richard 510
# End of script
1 root 511