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#!/bin/sh
 1 
#!/bin/sh
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# $Id: alcasar-iptables.sh 493 2011-02-14 06:46:55Z franck $
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# $Id: alcasar-iptables.sh 498 2011-02-24 20:56:27Z richard $
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# script de mise en place des regles du parefeu d'Alcasar (mode normal)
 3 
# script de mise en place des regles du parefeu d'Alcasar (mode normal)
4 
# Rexy - 3abtux - CPN
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# Rexy - 3abtux - CPN
5 
# there are three channels for log : 1 (default) for tracability, 2 for secure admin (ssh), 3 for exterior access attempts,
 5 
# there are three channels for log :
- 
 
 6 
#	1 (default) for tracability;
- 
 
 7 
#	2 for secure admin (ssh);
- 
 
 8 
#	3 for exterior access attempts.
6 
 
 9 
 
7 
IPTABLES="/sbin/iptables"
 10 
IPTABLES="/sbin/iptables"
8 
FILTERING="no"
 11 
FILTERING="no"
9 
QOS="no"
 12 
QOS="no"
10 
EXTIF="eth0"
 13 
EXTIF="eth0"
11 
INTIF="eth1"
 14 
INTIF="eth1"
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TUNIF="tun0"
 15 
TUNIF="tun0"
13 
PRIVATE_NETWORK_MASK="192.168.182.0/24"
 16 
PRIVATE_NETWORK_MASK="192.168.182.0/24"
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PRIVATE_IP="192.168.182.1"
 17 
PRIVATE_IP="192.168.182.1"
- 
 
 18 
DNSSERVERS="208.67.220.220,208.67.222.222"
15 
 
 19 
 
- 
 
 20 
# Effacement des règles existantes
16 
# Flush all existing rules
 21 
# Flush all existing rules
17 
$IPTABLES -F
 22 
$IPTABLES -F
18 
$IPTABLES -t nat -F
 23 
$IPTABLES -t nat -F
19 
$IPTABLES -t mangle -F
 24 
$IPTABLES -t mangle -F
20 
$IPTABLES -F INPUT
 25 
$IPTABLES -F INPUT
21 
$IPTABLES -F FORWARD
 26 
$IPTABLES -F FORWARD
22 
$IPTABLES -F OUTPUT
 27 
$IPTABLES -F OUTPUT
23 
$IPTABLES -N SYN-FLOOD
 - 
 
24 
 
 28 
 
- 
 
 29 
# Suppression des chaines utilisateurs sur les tables filter et nat
- 
 
 30 
# Flush non default rules on filter and nat tables
- 
 
 31 
$IPTABLES -X
- 
 
 32 
$IPTABLES -t nat -X
- 
 
 33 
 
- 
 
 34 
# Stratégies par défaut
25 
# Default policies
 35 
# Default policies
26 
$IPTABLES -P INPUT DROP
 36 
$IPTABLES -P INPUT DROP
27 
$IPTABLES -P FORWARD DROP
 37 
$IPTABLES -P FORWARD DROP
28 
$IPTABLES -P OUTPUT ACCEPT
 38 
$IPTABLES -P OUTPUT DROP
29 
$IPTABLES -t nat -P PREROUTING ACCEPT
 39 
$IPTABLES -t nat -P PREROUTING ACCEPT
30 
$IPTABLES -t nat -P POSTROUTING ACCEPT
 40 
$IPTABLES -t nat -P POSTROUTING ACCEPT
31 
$IPTABLES -t nat -P OUTPUT ACCEPT
 41 
$IPTABLES -t nat -P OUTPUT ACCEPT
32 
 
 42 
 
33 
# Flush non default rules on filter and nat tables
 43 
# Création des chaînes utilisateur
34 
$IPTABLES -X
 44 
# User defined chains
35 
$IPTABLES -t nat -X
 45 
$IPTABLES -N SYN-FLOOD
36 
 
 46 
 
- 
 
 47 
# Tout passe sur loopback
37 
# accept all on loopback
 48 
# accept all on loopback
38 
$IPTABLES -A INPUT -i lo -j ACCEPT
 49 
$IPTABLES -A INPUT -i lo -j ACCEPT
39 
 
 50 
 
- 
 
 51 
# Blocage des tentatives de spoofing de l'adresse de loopback
40 
# Block all attempts to spoof the loopback address
 52 
# Block all attempts to spoof the loopback address
41 
$IPTABLES -A INPUT -s 127.0.0.0/8 -j DROP
 53 
$IPTABLES -A INPUT -s 127.0.0.0/8 -j DROP
42 
$IPTABLES -A INPUT -d 127.0.0.0/8 -j DROP
 54 
$IPTABLES -A INPUT -d 127.0.0.0/8 -j DROP
43 
 
 55 
 
- 
 
 56 
# Blocage des tentatives de spoofing de l'adresse IP côté interne
44 
# Block all attempts to spoof the local IP address
 57 
# Block all attempts to spoof the local IP address
45 
$IPTABLES -A INPUT -s $PRIVATE_IP -j DROP
 58 
$IPTABLES -A INPUT -s $PRIVATE_IP -j DROP
46 
 
 59
- 
 
 60 
# Blocage des attaques de type SYN FLOOD
47 
# Block Syn Flood attacks
 61 
# Block Syn Flood attacks
48 
$IPTABLES -A INPUT -p tcp -m tcp --syn -j SYN-FLOOD
 62 
#$IPTABLES -A INPUT -p tcp -m tcp --syn -j SYN-FLOOD
49 
 
 - 
 
50 
# Syn flood filtering chain
 - 
 
51 
$IPTABLES -A SYN-FLOOD -m limit --limit 1/s --limit-burst 4 -j RETURN
 63 
#$IPTABLES -A SYN-FLOOD -m limit --limit 1/s --limit-burst 4 -j RETURN
52 
$IPTABLES -A SYN-FLOOD -j DROP
 64 
#$IPTABLES -A SYN-FLOOD -j DROP
53 
 
 65 
 
- 
 
 66 
# On élimine les paquets "NEW not SYN"
54 
# Ensure that TCP connections start with syn packets
 67 
# Ensure that TCP connections start with syn packets
55 
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
 68 
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
56 
 
 69 
 
57 
#############################
 70 
#############################
58 
#       INTIF rules         #
 71 
#       INTIF rules         #
59 
#############################
 72 
#############################
- 
 
 73 
# les requètes dhcp entrantes sont acceptées
60 
# accept dhcp
 74 
# accept dhcp
61 
$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
 75 
$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
- 
 
 76 
 
- 
 
 77 
# La règle suivante interdit la sortie par INTIF. Elle n'est utile que lorsque chilli est arrêté.
62 
# INTIF is closed (all by TUNIF)
 78 
# INTIF is closed (all by TUNIF)
63 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
 79 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
64 
$IPTABLES -A INPUT -i $INTIF -j REJECT
 80 
$IPTABLES -A INPUT -i $INTIF -j REJECT
65 
 
 81 
 
66 
#############################
 82 
#############################
67 
#  Local protection rules   #
 83 
#  Local protection rules   #
68 
#############################
 84 
#############################
- 
 
 85 
# On stoppe les tentatives de NULLSCAN et XMAS (tous flags à 1)
69 
# Drop XMAS & NULLscans
86 
# Drop XMAS & NULLscans
70 
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
 87 
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
71 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
 88 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
72 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
 89 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
73 
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
 90 
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
- 
 
 91 
 
- 
 
 92 
# On stoppe les broadcasts et multicast
74 
# Drop broadcast & multicast
 93 
# Drop broadcast & multicast
75 
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
 94 
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
- 
 
 95 
 
- 
 
 96 
# Règles d'antispoofing
76 
# Antispoofing rules with log
 97 
# Antispoofing rules with log
77 
$IPTABLES -A INPUT -i $TUNIF ! -s $PRIVATE_NETWORK_MASK -j ULOG --ulog-prefix "RULE Antispoof1 -- DENY "
 98 
$IPTABLES -A INPUT -i $TUNIF ! -s $PRIVATE_NETWORK_MASK -j ULOG --ulog-prefix "RULE Antispoof1 -- DENY "
78 
$IPTABLES -A INPUT -i $TUNIF ! -s $PRIVATE_NETWORK_MASK -j DROP
 99 
$IPTABLES -A INPUT -i $TUNIF ! -s $PRIVATE_NETWORK_MASK -j DROP
79 
$IPTABLES -A INPUT -i $EXTIF -s $PRIVATE_NETWORK_MASK -j ULOG --ulog-prefix "RULE Antispoof2 -- DENY "
 100 
$IPTABLES -A INPUT -i $EXTIF -s $PRIVATE_NETWORK_MASK -j ULOG --ulog-prefix "RULE Antispoof2 -- DENY "
80 
$IPTABLES -A INPUT -i $EXTIF -s $PRIVATE_NETWORK_MASK -j DROP
 101 
$IPTABLES -A INPUT -i $EXTIF -s $PRIVATE_NETWORK_MASK -j DROP
- 
 
 102 
 
- 
 
 103 
# On laisse passer les ICMP echo-request et echo-reply en provenance du LAN
81 
# Allow ping (icmp N°0 & 8) from LAN
 104 
# Allow ping (icmp N°0 & 8) from LAN
82 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT
 105 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT
83 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT
 106 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT
84 
 
 107 
 
- 
 
 108 
# Insertion de règles locales
85 
#  Here, we add local rules (i.e. ssh from Internet)
 109 
# Here, we add local rules (i.e. ssh from Internet)
86 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
 110 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
87 
        . /usr/local/etc/alcasar-iptables-local.sh
 111 
        . /usr/local/etc/alcasar-iptables-local.sh
88 
fi
 112 
fi
89 
 
 113 
 
- 
 
 114 
# Rejet des tentatives de création de tunnels DNS (même pour les utilisateurs authentifiés)
90 
# Deny forward DNS (even for authenticated users ...)
 115 
# Deny forward DNS (even for authenticated users ...)
91 
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
 116 
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
92 
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
 117 
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
93 
 
 118 
 
- 
 
 119 
# On autorise les retours de connexions légitimes par FORWARD
94 
# Conntrack on forward
 120 
# Conntrack on forward
95 
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
 121 
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
96 
 
 122 
 
97 
#####################################
 123 
#####################################
98 
#  If protocols filter is activate  #
 124 
#  If protocols filter is activate  #
99 
#####################################
 125 
#####################################
100 
if [ $FILTERING = "yes" ]; then
 126 
if [ $FILTERING = "yes" ]; then
- 
 
 127 
	# Mise en place des exceptions (adresses IP des machines ne faisant pas l'objet de filtrage)
101 
	# Compute exception IP
 128 
	# Compute exception IP
102 
	nb_exceptions=`wc -w /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
 129 
	nb_exceptions=`wc -w /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
103 
	if [ $nb_exceptions != "0" ]
 130 
	if [ $nb_exceptions != "0" ]
104 
	then
 131 
	then
105 
		while read ip_exception
132 
		while read ip_exception
106 
		do
 133 
		do
107 
			echo $ip_exception
- 
 
108 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
 134 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
109 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ACCEPT
 135 
			$IPTABLES -A FORWARD -i $TUNIF -s $ip_exception -m state --state NEW -j ACCEPT
- 
 
 136 
			$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -s $ip_exception -d $PRIVATE_IP --dport domain -j REDIRECT --to-port 54
110 
		done < /usr/local/etc/alcasar-filter-exceptions
 137 
		done < /usr/local/etc/alcasar-filter-exceptions
111 
	fi
 138 
	fi
- 
 
 139 
	# Autorisation de protocoles non commentés
112 
	# Allow non comment protocols
 140 
	# Allow non comment protocols
113 
	while read svc_line
 141 
	while read svc_line
114 
	do
 142 
	do
115 
		svc_on=`echo $svc_line|cut -b1`
 143 
		svc_on=`echo $svc_line|cut -b1`
116 
		if [ $svc_on != "#" ]
 144 
		if [ $svc_on != "#" ]
Line 124... Line 152...
124 
				$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_$svc_name -- ACCEPT "
 152 
				$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_$svc_name -- ACCEPT "
125 
				$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
 153 
				$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
126 
			fi
 154 
			fi
127 
		fi
 155 
		fi
128 
	done < /usr/local/etc/alcasar-services
 156 
	done < /usr/local/etc/alcasar-services
- 
 
 157 
	# Rejet explicite (vers le LAN) des autres protocoles
129 
	# reject the others
 158 
	# reject the others
130 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
 159 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
131 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
 160 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
132 
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
 161 
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
133 
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
162 
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
Line 138... Line 167...
138 
########################
 167 
########################
139 
if [ $QOS = "yes" ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
 168 
if [ $QOS = "yes" ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
140 
	. /usr/local/etc/alcasar-iptables-qos.sh
169 
	. /usr/local/etc/alcasar-iptables-qos.sh
141 
fi
 170 
fi
142 
 
 171 
 
- 
 
 172 
# Autorisation des connections sortant du LAN
143 
# Allow forward connections with log
 173 
# Allow forward connections with log
144 
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
 174 
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
145 
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ACCEPT
 175 
$IPTABLES -A FORWARD -i $TUNIF -m state --state NEW -j ACCEPT
146 
 
 176 
 
147 
####################################################################################
 177 
###########################################################################################
148 
#  Imput from local network (dns, ntp, https, http, ssh and 3990 (user disconnect) #
 178 
#  Direct input from local network (dns, ntp, https, http, ssh and 3990 (user disconnect) #
149 
####################################################################################
 179 
###########################################################################################
150 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT
 180 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT # dnsmasq pour tous
151 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
 181 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
152 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport https -j ACCEPT
 182 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport https -j ACCEPT
153 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport http -j ACCEPT
 183 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport http -j ACCEPT
154 
$IPTABLES -A INPUT -i $TUNIF -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 -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
155 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
 185 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
156 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport 3990 -j ACCEPT
 186 
$IPTABLES -A INPUT -i $TUNIF -d $PRIVATE_IP -p tcp --dport 3990 -j ACCEPT
157 
 
 187 
 
- 
 
 188 
# On autorise les retours de connexions légitimes par INPUT
158 
# Conntrack on INPUT
 189 
# Conntrack on INPUT
159 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
 190 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
160 
 
 191 
 
- 
 
 192 
# On interdit les connexions directes au port utilisé par DansGuardian (8080) et par dnsmasq-forward (54)
- 
 
 193 
# Les packets concernés ont fait l'objet d'un marquage dans la table mangle
- 
 
 194 
# lors d'une règle de PREROUTING (voir plus bas)
161 
# Deny direct connections on DansGuardian port (8080)
 195 
# Deny direct connections on DansGuardian port (8080) and on dnsmasq-forward port (54)
162 
# The concerned paquets are marked by a pre-routing rule (see further)
 196 
# The concerned paquets are marked by a pre-routing rule (see further)
163 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j DROP
 197 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j DROP
- 
 
 198 
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 1 -j DROP
- 
 
 199 
# Autorisation des connexions à DansGuardian et dnsmasq-forward
164 
# Allow connections for DansGuardian
 200 
# Allow connections for DansGuardian and forward-mode dnsmasq
165 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
 201 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
- 
 
 202 
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -j ACCEPT
166 
 
 203 
 
- 
 
 204 
# Journalisation des requètes HTTP (seulement des paquets SYN)
167 
# Log HTTP requests (only syn)
 205 
# Log HTTP requests (only syn)
168 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
 206 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
- 
 
 207 
# On redirige les requêtes HTTP vers DansGuardian (transparent pour les utilisateurs)
169 
# Redirect HTTP request in DansGuardian (transparent proxy)
 208 
# Redirect HTTP request in DansGuardian (transparent proxy)
170 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -j REDIRECT --to-port 8080
 209 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp ! -d $PRIVATE_IP --dport http -j REDIRECT --to-port 8080
- 
 
 210 
# Journalisation et marquage des paquets qui tentent d'accéder directement à DansGuardian et à dnsmasq-forward
- 
 
 211 
# pour pouvoir les supprimer en INPUT (voir plus haut)
171 
# Mark the dansguardian bypass attempts
 212 
# Mark the dansguardian or dnsmasq bypass attempts
172 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
 213 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
- 
 
 214 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP -m udp --dport 54 -j ULOG --ulog-prefix "RULE direct-dns -- DENY "
173 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j MARK --set-mark 1
 215 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j MARK --set-mark 1
- 
 
 216 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -p udp -d $PRIVATE_IP -m udp --dport 54 -j MARK --set-mark 1
174 
 
 217 
 
- 
 
 218 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
175 
# Deny and log on INPUT from the LAN
 219 
# Deny and log on INPUT from the LAN
176 
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
 220 
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
177 
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
 221 
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
178 
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
 222 
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
179 
 
 223 
 
- 
 
 224 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
180 
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
 225 
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
181 
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
 226 
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
182 
# Drop on EXTIF
 - 
 
183 
$IPTABLES -A INPUT -i $EXTIF -j DROP
 - 
 
184 
 
 227 
 
- 
 
 228 
#############################
- 
 
 229 
# filtering outside OUTPUT. #
- 
 
 230 
#############################
- 
 
 231 
 
- 
 
 232 
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
- 
 
 233 
# Everything is allowed but traffic through outside network interface
- 
 
 234 
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
- 
 
 235 
 
- 
 
 236 
# On autorise le parefeu à requêter les DNS externes
- 
 
 237 
# Allow DNS requests to identified DNS servers
- 
 
 238 
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
- 
 
 239 
 
- 
 
 240 
# On autorise les requêtes http sortantes
- 
 
 241 
# HTTP requests are allowed
- 
 
 242 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
- 
 
 243 
 
- 
 
 244 
# On autorise les requêtes ntp
- 
 
 245 
# NTP requests are allowed
- 
 
 246 
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
- 
 
 247 
 
- 
 
 248 
# Traduction dynamique d'adresse en sortie
185 
# Dynamic NAT on EXTIF
 249 
# Dynamic NAT on EXTIF
186 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
 250 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
187 
 
 251 
 
188 
# Save all rules
 252 
# Save all rules
189 
/etc/init.d/iptables save
 253 
/etc/init.d/iptables save