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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 1147 2013-07-02 22:00:21Z richard $
675 richard 3
# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
568 richard 4
# This script write the netfilter rules for ALCASAR
675 richard 5
# Rexy - 3abtux - CPN
6
#
7
# Reminders
568 richard 8
# There are three channels for log :
498 richard 9
#	1 (default) for tracability;
10
#	2 for secure admin (ssh);
11
#	3 for exterior access attempts.
783 richard 12
# The French Security Agency (ANSSI) rules was applied by 'this script
675 richard 13
# The bootps/dhcp (67) port is always open on tun0/eth1 by coova 
612 richard 14
conf_file="/usr/local/etc/alcasar.conf"
766 richard 15
private_ip_mask=`grep PRIVATE_IP= $conf_file|cut -d"=" -f2`
615 richard 16
private_ip_mask=${private_ip_mask:=192.168.182.1/24}
783 richard 17
PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
604 richard 18
private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
19
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
783 richard 20
PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
21
public_ip_mask=`grep PUBLIC_IP= $conf_file|cut -d"=" -f2`		# ALCASAR WAN IP address
22
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
766 richard 23
dns1=`grep DNS1= $conf_file|cut -d"=" -f2`				# first public DNS server
615 richard 24
dns1=${dns1:=208.67.220.220}
766 richard 25
dns2=`grep DNS2= $conf_file|cut -d"=" -f2`				# second public DNS server
615 richard 26
dns2=${dns2:=208.67.222.222}
783 richard 27
DNSSERVERS="$dns1,$dns2"						# first and second DNS IP servers addresses
766 richard 28
PROTOCOLS_FILTERING=`grep PROTOCOLS_FILTERING= $conf_file|cut -d"=" -f2`	# Network protocols filter (on/off)
615 richard 29
PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
766 richard 30
DNS_FILTERING=`grep DNS_FILTERING= $conf_file|cut -d"=" -f2`		# DNS and URLs filter (on/off)
615 richard 31
DNS_FILTERING=${DNS_FILTERING:=off}
1072 richard 32
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
783 richard 33
QOS=`grep QOS= $conf_file|cut -d"=" -f2`				# QOS (on/off)
615 richard 34
QOS=${QOS:=off}
783 richard 35
SSH=`grep SSH= $conf_file|cut -d"=" -f2`				# sshd active (on/off)
615 richard 36
SSH=${SSH:=off}
1063 richard 37
SSH_ADMIN_FROM=`grep SSH_ADMIN_FROM= $conf_file|cut -d"=" -f2`
38
SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
783 richard 39
LDAP=`grep LDAP= $conf_file|cut -d"=" -f2`				# LDAP external server active (on/off)
615 richard 40
LDAP=${LDAP:=off}
783 richard 41
LDAP_IP=`grep LDAP_IP= $conf_file|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
768 richard 42
LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
675 richard 43
EXTIF="eth0"
1 root 44
INTIF="eth1"
783 richard 45
TUNIF="tun0"								# listen device for chilli daemon
612 richard 46
IPTABLES="/sbin/iptables"
1 root 47
 
498 richard 48
# Effacement des règles existantes
476 richard 49
# Flush all existing rules
1 root 50
$IPTABLES -F
51
$IPTABLES -t nat -F
52
$IPTABLES -t mangle -F
53
$IPTABLES -F INPUT
54
$IPTABLES -F FORWARD
55
$IPTABLES -F OUTPUT
56
 
498 richard 57
# Suppression des chaines utilisateurs sur les tables filter et nat
58
# Flush non default rules on filter and nat tables
59
$IPTABLES -X
60
$IPTABLES -t nat -X
61
 
62
# Stratégies par défaut
476 richard 63
# Default policies
1 root 64
$IPTABLES -P INPUT DROP
65
$IPTABLES -P FORWARD DROP
498 richard 66
$IPTABLES -P OUTPUT DROP
1 root 67
$IPTABLES -t nat -P PREROUTING ACCEPT
68
$IPTABLES -t nat -P POSTROUTING ACCEPT
69
$IPTABLES -t nat -P OUTPUT ACCEPT
70
 
472 richard 71
#############################
783 richard 72
#       PREROUTING          #
472 richard 73
#############################
783 richard 74
# Marquage (et journalisation) des paquets qui tentent d'accéder directement à DansGuardian pour pouvoir les rejeter en INPUT
75
# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
76
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
77
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 78
 
783 richard 79
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port udp 54 pour pouvoir les rejeter en INPUT
80
# Mark (and log) the udp 54 direct attempts to REJECT them in INPUT rules
81
# Remarque : Ce port n'est ouvert que lorsque le filtrage est activé
82
# Remark : this port is only open when filtering is on
83
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP -m udp --dport 54 -j ULOG --ulog-prefix "RULE DNS-proxy -- DENY "
84
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 2
85
 
1072 richard 86
# Si le filtrage DNS est activé, redirection des flux DNS vers le port 54 (dns+blackhole) sauf pour les IP en exceptions 
783 richard 87
# If DNS filter is on, redirect DNS request to udp 54 (dns+blackhole) except for exception IP addresses
88
if [ $DNS_FILTERING = on ]; then
89
	# Compute exception IP
90
	nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
91
	if [ $nb_exceptions != "0" ]
92
	then
93
		while read ip_exception 
94
		do
95
			$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -s $ip_exception -d $PRIVATE_IP --dport domain -j ACCEPT
96
		done < /usr/local/etc/alcasar-filter-exceptions
97
	fi
98
		$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
99
fi
100
 
101
# Journalisation des requètes HTTP vers Internet (seulement les paquets SYN) - Les autres protocoles sont journalisés en FORWARD
102
# Log HTTP requests to Internet (only syn packets) - Other protocols are log in FORWARD
103
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
104
# Redirection des requêtes HTTP vers DansGuardian (proxy transparent)
105
# Redirect HTTP requests in DansGuardian (transparent proxy)
106
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
107
 
108
# Redirection des requêtes NTP vers le serveur NTP local
109
# Redirect NTP request in local NTP server
110
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
111
 
472 richard 112
#############################
783 richard 113
#         INPUT             #
472 richard 114
#############################
871 richard 115
 
783 richard 116
# Tout passe sur loopback
117
# accept all on loopback
118
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 119
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 120
 
121
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
122
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 123
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
124
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
125
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
126
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 127
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 128
 
871 richard 129
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
130
# Drop broadcast & multicast on EXTIF to avoid log 
783 richard 131
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 132
 
783 richard 133
# On autorise les retours de connexions légitimes par INPUT
134
# Conntrack on INPUT
135
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 136
 
783 richard 137
# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
138
# Deny direct connections on DansGuardian port (8080). The concerned paquets are marked in mangle table (PREROUTING)
139
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 140
 
859 richard 141
# Insertion des règles de blocage IP
142
# Here, we add IP block rules 
143
if [ -s /usr/local/etc/alcasar-ip-blocked ]; then 
144
	while read ip_line
145
	do
146
		ip_on=`echo $ip_line|cut -b1`
147
		if [ $ip_on != "#" ]
148
		then	
149
			ip_blocked=`echo $ip_line|cut -d" " -f1`
150
			$IPTABLES -A INPUT -i $TUNIF -d $ip_blocked -p tcp --dport 8080 -m state --state NEW --syn -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
151
			$IPTABLES -A INPUT -i $TUNIF -d $ip_blocked -p tcp --dport 8080 -m state --state NEW --syn -j REJECT 
152
		fi
153
	done < /usr/local/etc/alcasar-ip-blocked
154
fi
783 richard 155
# Autorisation des connexions légitimes à DansGuardian 
156
# Allow connections for DansGuardian
157
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 158
 
783 richard 159
# On interdit les connexions directes au port UDP 54. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
160
# Deny direct connections on UDP 54. The concerned paquets are marked in mangle table (PREROUTING)
161
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 2 -j REJECT --reject-with icmp-port-unreachable
791 richard 162
 
783 richard 163
# autorisation des connexion légitime à DNSMASQ (avec blackhole)
164
# Allow connections for DNSMASQ (with blackhole)
165
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
166
 
167
# Accès direct aux services internes
168
# Internal services access
786 richard 169
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS non filtré # DNS without blackhole
170
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
171
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
172
$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
173
$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
174
$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
175
$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 176
 
177
# SSHD rules if activate 
178
if [ $SSH = on ]
520 richard 179
	then
783 richard 180
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
181
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1063 richard 182
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
183
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW,ESTABLISHED -j ACCEPT
520 richard 184
fi
783 richard 185
 
186
# Insertion de règles locales
187
# Here, we add local rules (i.e. VPN from Internet)
188
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
189
        . /usr/local/etc/alcasar-iptables-local.sh
190
fi
191
 
192
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
193
# Deny and log on INPUT from the LAN
194
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
195
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
196
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
197
 
198
# interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
199
# Reject INTIF access (only when chilli is down)
200
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
201
$IPTABLES -A INPUT -i $INTIF -j REJECT
202
 
203
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
204
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
205
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
206
 
871 richard 207
 
783 richard 208
#############################
209
#        FORWARD            #
210
#############################
211
 
212
# Rejet des requêtes DNS vers Internet
213
# Deny forward DNS
214
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
215
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
216
 
859 richard 217
# Insertion des règles de blocage IP
1072 richard 218
# Here, we add local IP block rules 
859 richard 219
if [ -s /usr/local/etc/alcasar-ip-blocked ]; then 
220
	while read ip_line
221
	do
222
		ip_on=`echo $ip_line|cut -b1`
223
		if [ $ip_on != "#" ]
224
		then	
225
			ip_blocked=`echo $ip_line|cut -d" " -f1`
226
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
227
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p udp -j REJECT --reject-with icmp-port-unreachable
228
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p icmp -j REJECT --reject-with icmp-port-unreachable
229
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p tcp -j REJECT --reject-with tcp-reset
230
		fi
231
	done < /usr/local/etc/alcasar-ip-blocked
790 richard 232
fi
859 richard 233
 
1072 richard 234
# Si le filtrage de domain est activé, blocage des IP de la BL 
235
# If DNS filter is on, reject IP of BL
236
# Comment : loading time is too long and iptables should become oveloaded !!!
237
#if [ $DNS_FILTERING = on ]; then
238
#	cd $BL_IP_CAT
239
#	for category in `ls -1 | cut -d"@" -f1`
240
#	do
241
#		while read ip_blocked
242
#		do
243
#			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
244
#			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p udp -j REJECT --reject-with icmp-port-unreachable
245
#			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p icmp -j REJECT --reject-with icmp-port-unreachable
246
#			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p tcp -j REJECT --reject-with tcp-reset
247
#		done < $BL_IP_CAT/$category
248
#	done
249
#fi
250
 
815 richard 251
# Autorisation des retours de connexions légitimes
252
# Allow conntrack
253
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 254
 
783 richard 255
#  If protocols filter is activate 
612 richard 256
if [ $PROTOCOLS_FILTERING = on ]; then
688 richard 257
	# Compute exception IP (IP addresses that shouldn't be filtered)
258
	nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
373 richard 259
	if [ $nb_exceptions != "0" ]
260
	then
261
		while read ip_exception 
262
		do
263
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
264
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ACCEPT
265
		done < /usr/local/etc/alcasar-filter-exceptions
266
	fi
871 richard 267
	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...) 
268
	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
269
	if [ $nb_uamallowed != "0" ]
688 richard 270
	then
271
		while read ip_allowed_line 
272
		do
273
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
274
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
275
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
276
		done < /usr/local/etc/alcasar-uamallowed
277
	fi
520 richard 278
	# Autorisation des protocoles non commentés
476 richard 279
	# Allow non comment protocols
373 richard 280
	while read svc_line
281
	do
282
		svc_on=`echo $svc_line|cut -b1`
283
		if [ $svc_on != "#" ]
284
		then	
285
			svc_name=`echo $svc_line|cut -d" " -f1`
286
			svc_port=`echo $svc_line|cut -d" " -f2`
287
			if [ $svc_name = "icmp" ]
288
			then
859 richard 289
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT 
373 richard 290
			else
859 richard 291
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
292
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
293
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_UDP-$svc_name -- ACCEPT "
294
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
373 richard 295
			fi
296
		fi
297
	done < /usr/local/etc/alcasar-services
783 richard 298
	# Rejet explicite des autres protocoles
299
	# reject the others protocols
300
	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
373 richard 301
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
302
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
303
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT 
1 root 304
fi
492 franck 305
 
306
#  If QOS is activate  #
612 richard 307
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 308
	. /usr/local/etc/alcasar-iptables-qos.sh 	
309
fi
310
 
498 richard 311
# Autorisation des connections sortant du LAN  
476 richard 312
# Allow forward connections with log
859 richard 313
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
314
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 315
 
783 richard 316
#############################
317
#         OUTPUT            #
318
#############################
1147 richard 319
 
320
# On autorise les retours de connexions légitimes par OUTPUT
321
# Conntrack on OUTPUT
322
$IPTABLES -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
323
 
324
# On laisse tout sortir sur INTIF
325
# Everything is allowed only on INTIF
498 richard 326
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 327
 
503 richard 328
# On autorise les requêtes DNS vers les serveurs DNS identifiés 
498 richard 329
# Allow DNS requests to identified DNS servers
330
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 331
 
615 richard 332
# On autorise les requêtes HTTP sortantes
498 richard 333
# HTTP requests are allowed
334
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 335
 
784 richard 336
# On autorise les requêtes FTP 
337
# FTP requests are allowed
338
modprobe ip_conntrack_ftp
339
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
340
 
615 richard 341
# On autorise les requêtes NTP 
498 richard 342
# NTP requests are allowed
343
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 344
 
503 richard 345
# On autorise les requêtes ICMP (ping) 
346
# ICMP (ping) requests are allowed
347
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 348
 
615 richard 349
# On autorise les requêtes LDAP si un serveur externe est configué
350
# LDAP requests are allowed if an external server is declared
351
if [ $LDAP = on ]
352
	then
694 franck 353
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
354
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
355
#	$IPTABLES -A INPUT  -p tcp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
356
#	$IPTABLES -A INPUT  -p udp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
615 richard 357
fi
783 richard 358
 
359
#############################
360
#       POSTROUTING         #
361
#############################
498 richard 362
# Traduction dynamique d'adresse en sortie
476 richard 363
# Dynamic NAT on EXTIF
1 root 364
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
365
 
476 richard 366
# Save all rules
1 root 367
/etc/init.d/iptables save
368
 
476 richard 369
# End of script
1 root 370