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675 richard 1 
#!/bin/sh
64 franck 2 
# $Id: alcasar-iptables.sh 848 2012-04-03 17:43:10Z franck $
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}
790 richard 30 
EXT_LAN_FILTERING=`grep EXT_LAN_FILTERING= $conf_file|cut -d"=" -f2`	# filter acces to the lan on alcasar/eth0 (on/off)
31 
EXT_LAN_FILTERING=${EXT_LAN_FILTERING:=off}
766 richard 32 
DNS_FILTERING=`grep DNS_FILTERING= $conf_file|cut -d"=" -f2`		# DNS and URLs filter (on/off)
615 richard 33 
DNS_FILTERING=${DNS_FILTERING:=off}
783 richard 34 
QOS=`grep QOS= $conf_file|cut -d"=" -f2`				# QOS (on/off)
615 richard 35 
QOS=${QOS:=off}
783 richard 36 
SSH=`grep SSH= $conf_file|cut -d"=" -f2`				# sshd active (on/off)
615 richard 37 
SSH=${SSH:=off}
783 richard 38 
Admin_from_IP=${Admin_from_IP:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
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 
 
86 
# Si le filtrage est activé, redirection des flux DNS vers le port 54 (dns+blackhole) sauf pour les IP en exceptions
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 
#############################
783 richard 115 
# Tout passe sur loopback
116 
# accept all on loopback
117 
$IPTABLES -A INPUT -i lo -j ACCEPT
118 
 
810 franck 119 
# Insertion de règles de blocage (Devel)
120 
# Here, we add block rules (Devel)
848 franck 121 
if [ -s /usr/local/etc/alcasar-iptables-block ]; then
122 
    while read ip_blocked
123 
    do
124 
      echo "Network Address blocked : $ip_blocked"
125 
      $IPTABLES -A FORWARD -d $ip_blocked -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
126 
      $IPTABLES -A FORWARD -d $ip_blocked -j REJECT
127 
      $IPTABLES -A FORWARD -s $ip_blocked -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
128 
      $IPTABLES -A FORWARD -s $ip_blocked -j REJECT
129 
    done < /usr/local/etc/alcasar-iptables-block
810 franck 130 
fi
131 
 
783 richard 132 
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
133 
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 134 
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
135 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
136 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
137 
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 138 
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 139 
 
810 franck 140 
# On rejette les trame en broadcast et en multicast sur EXTIF (pour ne pas les journaliser)
783 richard 141 
# Drop broadcast & multicast on EXTIF to not be logged
142 
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 143 
 
783 richard 144 
# On autorise les retours de connexions légitimes par INPUT
145 
# Conntrack on INPUT
146 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 147 
 
783 richard 148 
# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
149 
# Deny direct connections on DansGuardian port (8080). The concerned paquets are marked in mangle table (PREROUTING)
150 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 151 
 
152 
# Filtrage de l'accès au LAN connecté sur EXTIF (eth0)
153 
# EXTIF (eth0) connected LAN filtering
154 
if [ $EXT_LAN_FILTERING = on ]; then
155 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $public_ip_mask -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
156 
else
783 richard 157 
# Autorisation des connexions légitimes à DansGuardian
158 
# Allow connections for DansGuardian
159 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
791 richard 160 
fi
373 richard 161 
 
783 richard 162 
# On interdit les connexions directes au port UDP 54. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
163 
# Deny direct connections on UDP 54. The concerned paquets are marked in mangle table (PREROUTING)
164 
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 2 -j REJECT --reject-with icmp-port-unreachable
791 richard 165 
 
783 richard 166 
# autorisation des connexion légitime à DNSMASQ (avec blackhole)
167 
# Allow connections for DNSMASQ (with blackhole)
168 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
169 
 
170 
# Accès direct aux services internes
171 
# Internal services access
786 richard 172 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS non filtré # DNS without blackhole
173 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
174 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
175 
$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
176 
$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
177 
$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
178 
$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 179 
 
180 
# SSHD rules if activate
181 
if [ $SSH = on ]
520 richard 182 
	then
783 richard 183 
	$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"
184 
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
185 
	$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"
186 
	$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 187 
fi
783 richard 188 
 
189 
# Insertion de règles locales
190 
# Here, we add local rules (i.e. VPN from Internet)
191 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
192 
        . /usr/local/etc/alcasar-iptables-local.sh
193 
fi
194 
 
195 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
196 
# Deny and log on INPUT from the LAN
197 
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
198 
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
199 
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
200 
 
201 
# interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
202 
# Reject INTIF access (only when chilli is down)
203 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
204 
$IPTABLES -A INPUT -i $INTIF -j REJECT
205 
 
206 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
207 
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
208 
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
209 
 
210 
#############################
211 
#        FORWARD            #
212 
#############################
213 
 
214 
# Rejet des requêtes DNS vers Internet
215 
# Deny forward DNS
216 
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
217 
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
218 
 
790 richard 219 
# Filtrage de l'accès au LAN connecté sur EXTIF (eth0)
220 
# EXTIF (eth0) connected LAN filtering
221 
if [ $EXT_LAN_FILTERING = on ]; then
222 
$IPTABLES -A FORWARD -i $TUNIF -p udp -d $public_ip_mask -j REJECT --reject-with icmp-port-unreachable
223 
$IPTABLES -A FORWARD -i $TUNIF -p icmp -d $public_ip_mask -j REJECT --reject-with icmp-port-unreachable
224 
$IPTABLES -A FORWARD -i $TUNIF -p tcp -d $public_ip_mask -j REJECT --reject-with tcp-reset
225 
fi
815 richard 226 
# Autorisation des retours de connexions légitimes
227 
# Allow conntrack
228 
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 229 
 
783 richard 230 
#  If protocols filter is activate
612 richard 231 
if [ $PROTOCOLS_FILTERING = on ]; then
688 richard 232 
	# Compute exception IP (IP addresses that shouldn't be filtered)
233 
	nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
373 richard 234 
	if [ $nb_exceptions != "0" ]
235 
	then
236 
		while read ip_exception
237 
		do
238 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
239 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ACCEPT
240 
		done < /usr/local/etc/alcasar-filter-exceptions
241 
	fi
688 richard 242 
	# Compute uamallowed IP (IP address of equipments connect between ALCASAR and Internet (DMZ, own servers, ...)
243 
	nb_exceptions=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
244 
	if [ $nb_exceptions != "0" ]
245 
	then
246 
		while read ip_allowed_line
247 
		do
248 
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
249 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
250 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
251 
		done < /usr/local/etc/alcasar-uamallowed
252 
	fi
520 richard 253 
	# Autorisation des protocoles non commentés
476 richard 254 
	# Allow non comment protocols
373 richard 255 
	while read svc_line
256 
	do
257 
		svc_on=`echo $svc_line|cut -b1`
258 
		if [ $svc_on != "#" ]
259 
		then
260 
			svc_name=`echo $svc_line|cut -d" " -f1`
261 
			svc_port=`echo $svc_line|cut -d" " -f2`
262 
			if [ $svc_name = "icmp" ]
263 
			then
264 
				$IPTABLES -A FORWARD -i $TUNIF -p icmp -j ACCEPT
265 
			else
783 richard 266 
				$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
373 richard 267 
				$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
783 richard 268 
				$IPTABLES -A FORWARD -i $TUNIF -p udp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_UDP-$svc_name -- ACCEPT "
269 
				$IPTABLES -A FORWARD -i $TUNIF -p udp --dport $svc_port -m state --state NEW -j ACCEPT
373 richard 270 
			fi
271 
		fi
272 
	done < /usr/local/etc/alcasar-services
783 richard 273 
	# Rejet explicite des autres protocoles
274 
	# reject the others protocols
275 
	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
373 richard 276 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
277 
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
278 
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
1 root 279 
fi
492 franck 280 
 
281 
#  If QOS is activate  #
612 richard 282 
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 283 
	. /usr/local/etc/alcasar-iptables-qos.sh
284 
fi
285 
 
498 richard 286 
# Autorisation des connections sortant du LAN
476 richard 287 
# Allow forward connections with log
288 
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
411 richard 289 
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ACCEPT
1 root 290 
 
783 richard 291 
#############################
292 
#         OUTPUT            #
293 
#############################
604 richard 294 
# SSHD rules if activate
612 richard 295 
if [ $SSH = on ]
604 richard 296 
	then
297 
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport ssh -m state --state ESTABLISHED -j ACCEPT
298 
fi
498 richard 299 
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
300 
# Everything is allowed but traffic through outside network interface
301 
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 302 
 
503 richard 303 
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 304 
# Allow DNS requests to identified DNS servers
305 
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 306 
 
615 richard 307 
# On autorise les requêtes HTTP sortantes
498 richard 308 
# HTTP requests are allowed
309 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 310 
 
784 richard 311 
# On autorise les requêtes FTP
312 
# FTP requests are allowed
313 
modprobe ip_conntrack_ftp
314 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
315 
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
316 
 
615 richard 317 
# On autorise les requêtes NTP
498 richard 318 
# NTP requests are allowed
319 
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 320 
 
503 richard 321 
# On autorise les requêtes ICMP (ping)
322 
# ICMP (ping) requests are allowed
323 
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 324 
 
615 richard 325 
# On autorise les requêtes LDAP si un serveur externe est configué
326 
# LDAP requests are allowed if an external server is declared
327 
if [ $LDAP = on ]
328 
	then
694 franck 329 
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
330 
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
331 
#	$IPTABLES -A INPUT  -p tcp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
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#	$IPTABLES -A INPUT  -p udp -s $LDAP_IP -m multiports --sports ldap,ldaps -m state --state ESTABLISHED -j ACCEPT
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fi
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#############################
337 
#       POSTROUTING         #
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#############################
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# Traduction dynamique d'adresse en sortie
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# Dynamic NAT on EXTIF
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$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
342 
 
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# Save all rules
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/etc/init.d/iptables save
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# End of script
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