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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 1370 2014-06-03 21:16:25Z richard $
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 :
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#	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) 
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#	3 SSH on ALCASAR with the Ulog group 2;
12
#	4 extern access attempts on ALCASAR with the Ulog group 3.
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# The bootps/dhcp (67) port is always open on tun0/eth1 by coova 
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conf_file="/usr/local/etc/alcasar.conf"
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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)
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`
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dns1=`grep DNS1= $conf_file|cut -d"=" -f2`				# first public DNS server
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dns1=${dns1:=208.67.220.220}
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dns2=`grep DNS2= $conf_file|cut -d"=" -f2`				# second public DNS server
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dns2=${dns2:=208.67.222.222}
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DNSSERVERS="$dns1,$dns2"						# first and second DNS IP servers addresses
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PROTOCOLS_FILTERING=`grep PROTOCOLS_FILTERING= $conf_file|cut -d"=" -f2`	# Network protocols filter (on/off)
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PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
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DNS_FILTERING=`grep DNS_FILTERING= $conf_file|cut -d"=" -f2`		# DNS and URLs filter (on/off)
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DNS_FILTERING=${DNS_FILTERING:=off}
1332 richard 32
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1339 richard 33
BL_IP_OSSI="/usr/local/share/iptables-bl/ossi"				# ossi categoty
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FILE_IP_WL="/usr/local/share/ossi_wl"					# ip of the whitelist
35
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set 
36
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
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QOS=`grep QOS= $conf_file|cut -d"=" -f2`				# QOS (on/off)
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QOS=${QOS:=off}
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SSH=`grep SSH= $conf_file|cut -d"=" -f2`				# sshd active (on/off)
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SSH=${SSH:=off}
1063 richard 41
SSH_ADMIN_FROM=`grep SSH_ADMIN_FROM= $conf_file|cut -d"=" -f2`
42
SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
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LDAP=`grep LDAP= $conf_file|cut -d"=" -f2`				# LDAP external server active (on/off)
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LDAP=${LDAP:=off}
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LDAP_IP=`grep LDAP_IP= $conf_file|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
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LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
675 richard 47
EXTIF="eth0"
1 root 48
INTIF="eth1"
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TUNIF="tun0"								# listen device for chilli daemon
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IPTABLES="/sbin/iptables"
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IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
1364 richard 52
SAVE_DIR="/etc/sysconfig"						# Saving path
1 root 53
 
1364 richard 54
# Sauvegarde des SET des utilisateurs connectés si ils existent
55
# Saving SET of connected users if it exists
56
ipset list no_filtering_set 1>/dev/null 2>&1
57
if [ $? -eq 0 ];
58
then
59
	ipset save no_filtering_set > $TMP_users_set_save
60
	ipset save havp_set >> $TMP_users_set_save
61
	ipset save havp_bl_set >> $TMP_users_set_save
62
	ipset save havp_wl_set >> $TMP_users_set_save
63
fi
64
 
1291 richard 65
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 66
modprobe ipt_NETFLOW destination=127.0.0.1:2055
67
 
498 richard 68
# Effacement des règles existantes
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# Flush all existing rules
1 root 70
$IPTABLES -F
71
$IPTABLES -t nat -F
72
$IPTABLES -t mangle -F
73
$IPTABLES -F INPUT
74
$IPTABLES -F FORWARD
75
$IPTABLES -F OUTPUT
76
 
498 richard 77
# Suppression des chaines utilisateurs sur les tables filter et nat
78
# Flush non default rules on filter and nat tables
79
$IPTABLES -X
80
$IPTABLES -t nat -X
81
 
82
# Stratégies par défaut
476 richard 83
# Default policies
1 root 84
$IPTABLES -P INPUT DROP
85
$IPTABLES -P FORWARD DROP
498 richard 86
$IPTABLES -P OUTPUT DROP
1 root 87
$IPTABLES -t nat -P PREROUTING ACCEPT
88
$IPTABLES -t nat -P POSTROUTING ACCEPT
89
$IPTABLES -t nat -P OUTPUT ACCEPT
90
 
1291 richard 91
# destruction de tous les SET
1332 richard 92
# destroy all SET
1291 richard 93
ipset destroy
94
 
1364 richard 95
# Calcul de la taille du set
1332 richard 96
cd $BL_IP_CAT
1364 richard 97
set_bl_length=$(($(wc -l * | awk '{print $1}' | tail -n 1)+$(wc -l $BL_IP_OSSI | awk '{print $1}')))
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1339 richard 99
# Création du fichier set temporaire, remplissage, chargement et suppression
1364 richard 100
echo "create blacklist_ip_blocked hash:net family inet hashsize 1024 maxelem $set_bl_length" > $TMP_set_save
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for category in `ls -1 | cut -d '@' -f1`
102
do
1364 richard 103
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 104
done
1364 richard 105
cat $BL_IP_OSSI >> $TMP_set_save
106
ipset -! restore < $TMP_set_save
107
rm -f $TMP_set_save
1332 richard 108
 
1339 richard 109
# Extraction des ip réhabilitées
110
for ip in $(cat $IP_REHABILITEES)
111
do
112
	ipset del blacklist_ip_blocked $ip
113
done
114
 
1364 richard 115
# Calcul de la taille du set de la whitelist
116
set_wl_length=$(wc -l $FILE_IP_WL | awk '{print $1}')
1332 richard 117
 
1364 richard 118
# Création du fichier set temporaire, remplissage, chargement et suppression
119
echo "create whitelist_ip_allowed hash:net family inet hashsize 1024 maxelem $set_wl_length" > $TMP_set_save
120
cat $FILE_IP_WL >> $TMP_set_save
121
ipset -! restore < $TMP_set_save
122
rm -f $TMP_set_save
123
 
124
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET 
125
if [ -e $TMP_users_set_save ];
126
then
127
	ipset -! restore < $TMP_users_set_save
128
	rm -f $TMP_users_set_save
129
else
130
	ipset create no_filtering_set hash:net hashsize 1024
131
	ipset create havp_set hash:net hashsize 1024
132
	ipset create havp_bl_set hash:net hashsize 1024
133
	ipset create havp_wl_set hash:net hashsize 1024
134
fi
135
 
136
# Sauvegarde de tous les set sauf ceux d'interception (pour restaurer après redémarrage)
137
ipset save blacklist_ip_blocked > $SAVE_DIR/ipset_save
138
ipset save whitelist_ip_allowed >> $SAVE_DIR/ipset_save
139
echo "create no_filtering_set hash:net family inet hashsize 1024 maxelem 65536" >> $SAVE_DIR/ipset_save
140
echo "create havp_set hash:net family inet hashsize 1024 maxelem 65536" >> $SAVE_DIR/ipset_save
141
echo "create havp_bl_set hash:net family inet hashsize 1024 maxelem 65536" >> $SAVE_DIR/ipset_save
142
echo "create havp_wl_set hash:net family inet hashsize 1024 maxelem 65536" >> $SAVE_DIR/ipset_save
143
 
472 richard 144
#############################
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#       PREROUTING          #
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#############################
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# Marquage (et journalisation) des paquets qui tentent d'accéder directement à DansGuardian pour pouvoir les rejeter en INPUT
148
# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
1221 richard 149
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 151
 
783 richard 152
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port udp 54 pour pouvoir les rejeter en INPUT
153
# Mark (and log) the udp 54 direct attempts to REJECT them in INPUT rules
154
# $IPTABLES -A PREROUTING -t nat -i $TUNIF -p udp -d $PRIVATE_IP -m udp --dport 54 -j ULOG --ulog-prefix "RULE DNS-proxy -- DENY "
155
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 2
156
 
1364 richard 157
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port udp 55 pour pouvoir les rejeter en INPUT
158
# Mark (and log) the udp 55 direct attempts to REJECT them in INPUT rules
159
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 3
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1364 richard 161
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 pour pouvoir les rejeter en INPUT
162
# Mark (and log) the 8090 direct attempts to REJECT them in INPUT rules
163
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 4
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1364 richard 165
# Aiguillage des flux DNS
166
# Switching DNS streams
167
# havp_bl_set --> redirection vers le port 54
168
# havp_bl_set --> redirect to port 54
169
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 54
170
# havp_wl_set --> redirection vers le port 55
171
# havp_wl_set --> redirect to port 55
172
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 55
173
 
174
# Redirection des requêtes HTTP des IP de la blacklist vers ALCASAR (page 'accès interdit') pour le set havp_bl_set
175
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p tcp --dport http -j REDIRECT --to-port 80
176
 
1291 richard 177
# Journalisation des requètes HTTP vers Internet (seulement les paquets SYN) - Les autres protocoles sont journalisés en FORWARD par netflow
178
## Log HTTP requests to Internet (only syn packets) - Other protocols are log in FORWARD by netflow
1230 crox53 179
$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 "
1221 richard 180
 
1364 richard 181
# Redirection des requêtes HTTP sortantes vers HAVP pour le set havp_set
182
# Redirect outbound HTTP requests to HAVP for the set havp_set
183
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
783 richard 184
 
1364 richard 185
# Redirection des requêtes HTTP sortantes vers DansGuardian (proxy transparent) pour le set havp_bl_set
186
# Redirect outbound HTTP requests to DansGuardian (transparent proxy) for the set havp_bl_set
187
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8080
188
 
189
# Redirection des requêtes HTTP sortantes vers HAVP pour le set havp_wl_set
190
# Redirect outbound HTTP requests to HAVP for the set havp_wl_set
191
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
192
 
783 richard 193
# Redirection des requêtes NTP vers le serveur NTP local
194
# Redirect NTP request in local NTP server
195
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
196
 
472 richard 197
#############################
783 richard 198
#         INPUT             #
472 richard 199
#############################
871 richard 200
 
783 richard 201
# Tout passe sur loopback
202
# accept all on loopback
203
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 204
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 205
 
206
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
207
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 208
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
209
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
210
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
211
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 212
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 213
 
871 richard 214
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
215
# Drop broadcast & multicast on EXTIF to avoid log 
783 richard 216
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 217
 
783 richard 218
# On autorise les retours de connexions légitimes par INPUT
219
# Conntrack on INPUT
220
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 221
 
1221 richard 222
# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
223
# Deny direct connections on DansGuardian port (8080). The concerned paquets are marked and logged in mangle table (PREROUTING)
783 richard 224
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 225
 
783 richard 226
# Autorisation des connexions légitimes à DansGuardian 
227
# Allow connections for DansGuardian
228
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 229
 
783 richard 230
# On interdit les connexions directes au port UDP 54. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
231
# Deny direct connections on UDP 54. The concerned paquets are marked in mangle table (PREROUTING)
1364 richard 232
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 2 -j REJECT --reject-with icmp-port-unreachable
791 richard 233
 
1364 richard 234
# On interdit les connexions directes au port UDP 55. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
235
# Deny direct connections on UDP 55. The concerned paquets are marked in mangle table (PREROUTING)
236
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
237
 
238
# On interdit les connexions directes au port 8090. Les packets concernés ont été marqués dans la table mangle (PREROUTING)
239
# Deny direct connections on 8090. The concerned paquets are marked in mangle table (PREROUTING)
240
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 4 -j REJECT --reject-with tcp-reset
241
 
242
# Autorisation des connexions légitimes à HAVP 
243
# Allow connections for HAVP
244
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
245
 
246
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
247
# Allow connections for DNSMASQ (with blacklist)
783 richard 248
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
249
 
1364 richard 250
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
251
# Allow connections for DNSMASQ (with whitelist)
252
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
253
 
783 richard 254
# Accès direct aux services internes
255
# Internal services access
1364 richard 256
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS non filtré # DNS without blacklist
786 richard 257
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
258
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
259
$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
260
$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
261
$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
262
$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 263
 
264
# SSHD rules if activate 
265
if [ $SSH = on ]
520 richard 266
	then
783 richard 267
	$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"
268
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1063 richard 269
	$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"
1161 richard 270
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 271
fi
783 richard 272
 
273
# Insertion de règles locales
274
# Here, we add local rules (i.e. VPN from Internet)
275
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
276
        . /usr/local/etc/alcasar-iptables-local.sh
277
fi
278
 
279
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
280
# Deny and log on INPUT from the LAN
281
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
282
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
283
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
284
 
285
# interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
286
# Reject INTIF access (only when chilli is down)
287
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
288
$IPTABLES -A INPUT -i $INTIF -j REJECT
289
 
290
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
291
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
292
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
293
 
294
#############################
295
#        FORWARD            #
296
#############################
297
 
1364 richard 298
# Blocage des IPs du SET blacklist_ip_blocked pour le SET havp_bl_set
299
# Deny IPs of the SET blacklist_ip_blocked for the set havp_bl_set
300
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p icmp -j REJECT --reject-with icmp-port-unreachable
301
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p udp -j REJECT --reject-with icmp-port-unreachable
302
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set havp_bl_set src -m set --match-set blacklist_ip_blocked dst -p tcp -j REJECT --reject-with tcp-reset
303
 
783 richard 304
# Rejet des requêtes DNS vers Internet
305
# Deny forward DNS
306
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
307
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
308
 
815 richard 309
# Autorisation des retours de connexions légitimes
310
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 311
 
1364 richard 312
#  If protocols filter is activate
313
#if [ $PROTOCOLS_FILTERING = on ]; then
314
#	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...) 
315
#	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
316
#	if [ $nb_uamallowed != "0" ]
317
#	then
318
#		while read ip_allowed_line 
319
#		do
320
#			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
1221 richard 321
#			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
1364 richard 322
#			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
323
#			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
324
#		done < /usr/local/etc/alcasar-uamallowed
325
#	fi
326
#	# Autorisation des protocoles non commentés
327
#	# Allow non comment protocols
328
#	while read svc_line
329
#	do
330
#		svc_on=`echo $svc_line|cut -b1`
331
#		if [ $svc_on != "#" ]
332
#		then	
333
#			svc_name=`echo $svc_line|cut -d" " -f1`
334
#			svc_port=`echo $svc_line|cut -d" " -f2`
335
#			if [ $svc_name = "icmp" ]
336
#			then
337
#				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
338
#				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT 
339
#			else
340
#
1221 richard 341
#				$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 "
1364 richard 342
#				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
343
#				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
1221 richard 344
#				$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 "
1364 richard 345
#				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
346
#				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
347
#			fi
348
#		fi
349
#	done < /usr/local/etc/alcasar-services
350
#	# Rejet explicite des autres protocoles
351
#	# reject the others protocols
1221 richard 352
#	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
1364 richard 353
#	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
354
#	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
355
#	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT 
356
#fi
492 franck 357
 
358
#  If QOS is activate  #
612 richard 359
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 360
	. /usr/local/etc/alcasar-iptables-qos.sh 	
361
fi
362
 
498 richard 363
# Autorisation des connections sortant du LAN  
476 richard 364
# Allow forward connections with log
1221 richard 365
#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
1159 crox53 366
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 367
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 368
 
783 richard 369
#############################
370
#         OUTPUT            #
371
#############################
1159 crox53 372
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
373
# Everything is allowed but traffic through outside network interface
498 richard 374
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 375
 
503 richard 376
# On autorise les requêtes DNS vers les serveurs DNS identifiés 
498 richard 377
# Allow DNS requests to identified DNS servers
378
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 379
 
615 richard 380
# On autorise les requêtes HTTP sortantes
498 richard 381
# HTTP requests are allowed
1159 crox53 382
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 383
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 384
 
784 richard 385
# On autorise les requêtes FTP 
386
# FTP requests are allowed
387
modprobe ip_conntrack_ftp
388
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 389
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 390
 
615 richard 391
# On autorise les requêtes NTP 
498 richard 392
# NTP requests are allowed
393
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 394
 
503 richard 395
# On autorise les requêtes ICMP (ping) 
396
# ICMP (ping) requests are allowed
397
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 398
 
615 richard 399
# On autorise les requêtes LDAP si un serveur externe est configué
400
# LDAP requests are allowed if an external server is declared
401
if [ $LDAP = on ]
402
	then
694 franck 403
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
404
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 405
fi
783 richard 406
 
407
#############################
408
#       POSTROUTING         #
409
#############################
498 richard 410
# Traduction dynamique d'adresse en sortie
476 richard 411
# Dynamic NAT on EXTIF
1 root 412
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
413
 
476 richard 414
# Save all rules
1370 richard 415
/usr/libexec/iptables.init save
1 root 416
 
476 richard 417
# End of script
1 root 418