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872 richard 1 
#!/bin/bash
64 franck 2 
# $Id: alcasar-iptables.sh 1062 2013-04-01 21:20:12Z 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}
783 richard 32 
QOS=`grep QOS= $conf_file|cut -d"=" -f2`				# QOS (on/off)
615 richard 33 
QOS=${QOS:=off}
783 richard 34 
SSH=`grep SSH= $conf_file|cut -d"=" -f2`				# sshd active (on/off)
615 richard 35 
SSH=${SSH:=off}
1062 richard 36 
SSH_ADMIN_IP=`grep SSH_ADMIN_IP= $conf_file|cut -d"=" -f2`
37 
SSH_ADMIN_IP=${SSH_ADMIN_IP:="0.0.0.0/0.0.0.0"}				# WAN IP address to reduce ssh access (all ip allowed on LAN side)
783 richard 38 
LDAP=`grep LDAP= $conf_file|cut -d"=" -f2`				# LDAP external server active (on/off)
615 richard 39 
LDAP=${LDAP:=off}
783 richard 40 
LDAP_IP=`grep LDAP_IP= $conf_file|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
768 richard 41 
LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
675 richard 42 
EXTIF="eth0"
1 root 43 
INTIF="eth1"
783 richard 44 
TUNIF="tun0"								# listen device for chilli daemon
612 richard 45 
IPTABLES="/sbin/iptables"
1 root 46 
 
498 richard 47 
# Effacement des règles existantes
476 richard 48 
# Flush all existing rules
1 root 49 
$IPTABLES -F
50 
$IPTABLES -t nat -F
51 
$IPTABLES -t mangle -F
52 
$IPTABLES -F INPUT
53 
$IPTABLES -F FORWARD
54 
$IPTABLES -F OUTPUT
55 
 
498 richard 56 
# Suppression des chaines utilisateurs sur les tables filter et nat
57 
# Flush non default rules on filter and nat tables
58 
$IPTABLES -X
59 
$IPTABLES -t nat -X
60 
 
61 
# Stratégies par défaut
476 richard 62 
# Default policies
1 root 63 
$IPTABLES -P INPUT DROP
64 
$IPTABLES -P FORWARD DROP
498 richard 65 
$IPTABLES -P OUTPUT DROP
1 root 66 
$IPTABLES -t nat -P PREROUTING ACCEPT
67 
$IPTABLES -t nat -P POSTROUTING ACCEPT
68 
$IPTABLES -t nat -P OUTPUT ACCEPT
69 
 
472 richard 70 
#############################
783 richard 71 
#       PREROUTING          #
472 richard 72 
#############################
783 richard 73 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement à DansGuardian pour pouvoir les rejeter en INPUT
74 
# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
75 
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
76 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 77 
 
783 richard 78 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port udp 54 pour pouvoir les rejeter en INPUT
79 
# Mark (and log) the udp 54 direct attempts to REJECT them in INPUT rules
80 
# Remarque : Ce port n'est ouvert que lorsque le filtrage est activé
81 
# Remark : this port is only open when filtering is on
82 
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP -m udp --dport 54 -j ULOG --ulog-prefix "RULE DNS-proxy -- DENY "
83 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 2
84 
 
85 
# Si le filtrage est activé, redirection des flux DNS vers le port 54 (dns+blackhole) sauf pour les IP en exceptions
86 
# If DNS filter is on, redirect DNS request to udp 54 (dns+blackhole) except for exception IP addresses
87 
if [ $DNS_FILTERING = on ]; then
88 
	# Compute exception IP
89 
	nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
90 
	if [ $nb_exceptions != "0" ]
91 
	then
92 
		while read ip_exception
93 
		do
94 
			$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -s $ip_exception -d $PRIVATE_IP --dport domain -j ACCEPT
95 
		done < /usr/local/etc/alcasar-filter-exceptions
96 
	fi
97 
		$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
98 
fi
99 
 
100 
# Journalisation des requètes HTTP vers Internet (seulement les paquets SYN) - Les autres protocoles sont journalisés en FORWARD
101 
# Log HTTP requests to Internet (only syn packets) - Other protocols are log in FORWARD
102 
$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 "
103 
# Redirection des requêtes HTTP vers DansGuardian (proxy transparent)
104 
# Redirect HTTP requests in DansGuardian (transparent proxy)
105 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
106 
 
107 
# Redirection des requêtes NTP vers le serveur NTP local
108 
# Redirect NTP request in local NTP server
109 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
110 
 
472 richard 111 
#############################
783 richard 112 
#         INPUT             #
472 richard 113 
#############################
871 richard 114 
 
783 richard 115 
# Tout passe sur loopback
116 
# accept all on loopback
117 
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 118 
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 119 
 
120 
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
121 
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 122 
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
123 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
124 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
125 
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 126 
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 127 
 
871 richard 128 
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
129 
# Drop broadcast & multicast on EXTIF to avoid log
783 richard 130 
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 131 
 
783 richard 132 
# On autorise les retours de connexions légitimes par INPUT
133 
# Conntrack on INPUT
134 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 135 
 
783 richard 136 
# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
137 
# Deny direct connections on DansGuardian port (8080). The concerned paquets are marked in mangle table (PREROUTING)
138 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 139 
 
859 richard 140 
# Insertion des règles de blocage IP
141 
# Here, we add IP block rules
142 
if [ -s /usr/local/etc/alcasar-ip-blocked ]; then
143 
	while read ip_line
144 
	do
145 
		ip_on=`echo $ip_line|cut -b1`
146 
		if [ $ip_on != "#" ]
147 
		then
148 
			ip_blocked=`echo $ip_line|cut -d" " -f1`
149 
			$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 "
150 
			$IPTABLES -A INPUT -i $TUNIF -d $ip_blocked -p tcp --dport 8080 -m state --state NEW --syn -j REJECT
151 
		fi
152 
	done < /usr/local/etc/alcasar-ip-blocked
153 
fi
783 richard 154 
# Autorisation des connexions légitimes à DansGuardian
155 
# Allow connections for DansGuardian
156 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 157 
 
783 richard 158 
# On interdit les connexions directes au port UDP 54. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
159 
# Deny direct connections on UDP 54. The concerned paquets are marked in mangle table (PREROUTING)
160 
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 2 -j REJECT --reject-with icmp-port-unreachable
791 richard 161 
 
783 richard 162 
# autorisation des connexion légitime à DNSMASQ (avec blackhole)
163 
# Allow connections for DNSMASQ (with blackhole)
164 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
165 
 
166 
# Accès direct aux services internes
167 
# Internal services access
786 richard 168 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS non filtré # DNS without blackhole
169 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
170 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
171 
$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
172 
$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
173 
$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
174 
$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 175 
 
176 
# SSHD rules if activate
177 
if [ $SSH = on ]
520 richard 178 
	then
783 richard 179 
	$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"
180 
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
181 
	$IPTABLES -A INPUT -i $EXTIF -s $Admin_from_IP -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
182 
	$IPTABLES -A INPUT -i $EXTIF -s $Admin_from_IP -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW,ESTABLISHED -j ACCEPT
520 richard 183 
fi
783 richard 184 
 
185 
# Insertion de règles locales
186 
# Here, we add local rules (i.e. VPN from Internet)
187 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
188 
        . /usr/local/etc/alcasar-iptables-local.sh
189 
fi
190 
 
191 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
192 
# Deny and log on INPUT from the LAN
193 
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
194 
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
195 
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
196 
 
197 
# interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
198 
# Reject INTIF access (only when chilli is down)
199 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
200 
$IPTABLES -A INPUT -i $INTIF -j REJECT
201 
 
202 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
203 
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
204 
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
205 
 
871 richard 206 
 
783 richard 207 
#############################
208 
#        FORWARD            #
209 
#############################
210 
 
211 
# Rejet des requêtes DNS vers Internet
212 
# Deny forward DNS
213 
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
214 
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
215 
 
859 richard 216 
# Insertion des règles de blocage IP
217 
# Here, we add IP block rules
218 
if [ -s /usr/local/etc/alcasar-ip-blocked ]; then
219 
	while read ip_line
220 
	do
221 
		ip_on=`echo $ip_line|cut -b1`
222 
		if [ $ip_on != "#" ]
223 
		then
224 
			ip_blocked=`echo $ip_line|cut -d" " -f1`
225 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
226 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p udp -j REJECT --reject-with icmp-port-unreachable
227 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p icmp -j REJECT --reject-with icmp-port-unreachable
228 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_blocked -p tcp -j REJECT --reject-with tcp-reset
229 
		fi
230 
	done < /usr/local/etc/alcasar-ip-blocked
790 richard 231 
fi
859 richard 232 
 
815 richard 233 
# Autorisation des retours de connexions légitimes
234 
# Allow conntrack
235 
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 236 
 
783 richard 237 
#  If protocols filter is activate
612 richard 238 
if [ $PROTOCOLS_FILTERING = on ]; then
688 richard 239 
	# Compute exception IP (IP addresses that shouldn't be filtered)
240 
	nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
373 richard 241 
	if [ $nb_exceptions != "0" ]
242 
	then
243 
		while read ip_exception
244 
		do
245 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
246 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ACCEPT
247 
		done < /usr/local/etc/alcasar-filter-exceptions
248 
	fi
871 richard 249 
	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
250 
	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
251 
	if [ $nb_uamallowed != "0" ]
688 richard 252 
	then
253 
		while read ip_allowed_line
254 
		do
255 
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
256 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
257 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
258 
		done < /usr/local/etc/alcasar-uamallowed
259 
	fi
520 richard 260 
	# Autorisation des protocoles non commentés
476 richard 261 
	# Allow non comment protocols
373 richard 262 
	while read svc_line
263 
	do
264 
		svc_on=`echo $svc_line|cut -b1`
265 
		if [ $svc_on != "#" ]
266 
		then
267 
			svc_name=`echo $svc_line|cut -d" " -f1`
268 
			svc_port=`echo $svc_line|cut -d" " -f2`
269 
			if [ $svc_name = "icmp" ]
270 
			then
859 richard 271 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT
373 richard 272 
			else
859 richard 273 
				$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 "
274 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
275 
				$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 "
276 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
373 richard 277 
			fi
278 
		fi
279 
	done < /usr/local/etc/alcasar-services
783 richard 280 
	# Rejet explicite des autres protocoles
281 
	# reject the others protocols
282 
	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
373 richard 283 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
284 
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
285 
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
1 root 286 
fi
492 franck 287 
 
288 
#  If QOS is activate  #
612 richard 289 
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 290 
	. /usr/local/etc/alcasar-iptables-qos.sh
291 
fi
292 
 
498 richard 293 
# Autorisation des connections sortant du LAN
476 richard 294 
# Allow forward connections with log
859 richard 295 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
296 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 297 
 
783 richard 298 
#############################
299 
#         OUTPUT            #
300 
#############################
604 richard 301 
# SSHD rules if activate
612 richard 302 
if [ $SSH = on ]
604 richard 303 
	then
304 
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport ssh -m state --state ESTABLISHED -j ACCEPT
305 
fi
498 richard 306 
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
307 
# Everything is allowed but traffic through outside network interface
308 
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 309 
 
503 richard 310 
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 311 
# Allow DNS requests to identified DNS servers
312 
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 313 
 
615 richard 314 
# On autorise les requêtes HTTP sortantes
498 richard 315 
# HTTP requests are allowed
316 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 317 
 
784 richard 318 
# On autorise les requêtes FTP
319 
# FTP requests are allowed
320 
modprobe ip_conntrack_ftp
321 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
322 
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
323 
 
615 richard 324 
# On autorise les requêtes NTP
498 richard 325 
# NTP requests are allowed
326 
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 327 
 
503 richard 328 
# On autorise les requêtes ICMP (ping)
329 
# ICMP (ping) requests are allowed
330 
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 331 
 
615 richard 332 
# On autorise les requêtes LDAP si un serveur externe est configué
333 
# LDAP requests are allowed if an external server is declared
334 
if [ $LDAP = on ]
335 
	then
694 franck 336 
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
337 
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
338 
#	$IPTABLES -A INPUT  -p tcp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
339 
#	$IPTABLES -A INPUT  -p udp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
615 richard 340 
fi
783 richard 341 
 
342 
 
343 
#############################
344 
#       POSTROUTING         #
345 
#############################
498 richard 346 
# Traduction dynamique d'adresse en sortie
476 richard 347 
# Dynamic NAT on EXTIF
1 root 348 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
349 
 
476 richard 350 
# Save all rules
1 root 351 
/etc/init.d/iptables save
352 
 
476 richard 353 
# End of script
1 root 354