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872 richard 1
#!/bin/bash
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# $Id: alcasar-iptables.sh 1588 2015-03-08 23:00:08Z richard $
675 richard 3
# Script de mise en place des regles du parefeu d'Alcasar (mode normal)
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# This script writes the netfilter rules for ALCASAR
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# Rexy - 3abtux - CPN
6
#
7
# Reminders
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# There are four channels for log :
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#	1 tracability of the consultation equipment with The 'Netflow' kernel module (iptables target = NETFLOW);
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#	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/INTIF by coova 
14
CONF_FILE="/usr/local/etc/alcasar.conf"
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EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`				# EXTernal InterFace
16
INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2`				# INTernal InterFace
17
TUNIF="tun0"								# listen device for chilli daemon
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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)
22
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
783 richard 23
PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
1469 richard 24
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
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if [[ "$public_ip_mask" == "dhcp" ]]
26
then
27
	PTN="\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\/([012]?[0-9]|3[0-2])\b"
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	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`
1585 richard 29
fi
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PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
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dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`
32
dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`
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dns1=${dns1:=208.67.220.220}
34
dns2=${dns2:=208.67.222.222}
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DNSSERVERS="$dns1,$dns2"						# first and second public DNS servers
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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}
1332 richard 38
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1339 richard 39
BL_IP_OSSI="/usr/local/share/iptables-bl/ossi"				# ossi categoty
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WL_IP_OSSI="/usr/local/share/ossi-ip-wl"				# ip of the whitelist
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DNSMASQ_WL_ENABLED="/usr/local/share/dnsmasq-wl-enabled"		# enabled domain names for the Whitelist
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TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set 
43
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}
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SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
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SSH_ADMIN_FROM=${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"}
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IPTABLES="/sbin/iptables"
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IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
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SAVE_DIR="/etc/sysconfig"						# Saving path
1 root 57
 
1364 richard 58
# Sauvegarde des SET des utilisateurs connectés si ils existent
59
# Saving SET of connected users if it exists
60
ipset list no_filtering_set 1>/dev/null 2>&1
61
if [ $? -eq 0 ];
62
then
63
	ipset save no_filtering_set > $TMP_users_set_save
64
	ipset save havp_set >> $TMP_users_set_save
65
	ipset save havp_bl_set >> $TMP_users_set_save
66
	ipset save havp_wl_set >> $TMP_users_set_save
67
fi
68
 
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# loading of NetFlow probe (ipt_NETFLOW kernel module)
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modprobe ipt_NETFLOW destination=127.0.0.1:2055
71
 
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# Effacement des règles existantes
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# Flush all existing rules
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$IPTABLES -F
75
$IPTABLES -t nat -F
76
$IPTABLES -t mangle -F
77
$IPTABLES -F INPUT
78
$IPTABLES -F FORWARD
79
$IPTABLES -F OUTPUT
80
 
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# Suppression des chaines utilisateurs sur les tables filter et nat
82
# Flush non default rules on filter and nat tables
83
$IPTABLES -X
84
$IPTABLES -t nat -X
85
 
86
# Stratégies par défaut
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# Default policies
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$IPTABLES -P INPUT DROP
89
$IPTABLES -P FORWARD DROP
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$IPTABLES -P OUTPUT DROP
1 root 91
$IPTABLES -t nat -P PREROUTING ACCEPT
92
$IPTABLES -t nat -P POSTROUTING ACCEPT
93
$IPTABLES -t nat -P OUTPUT ACCEPT
94
 
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96
#############################
97
#          IPSET            #
98
#############################
99
 
1291 richard 100
# destruction de tous les SET
1332 richard 101
# destroy all SET
1291 richard 102
ipset destroy
103
 
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###### BL set  ###########
105
# Calcul de la taille / Compute the length
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bl_set_length=$(($(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)+$(wc -l $BL_IP_OSSI | awk '{print $1}')))
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# Chargement / loading
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echo "create blacklist_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
109
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
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do
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	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 112
done
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cat $BL_IP_OSSI >> $TMP_set_save
114
ipset -! restore < $TMP_set_save
115
rm -f $TMP_set_save
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# Suppression des ip réhabilitées / Removing of rehabilitated ip
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for ip in $(cat $IP_REHABILITEES)
118
do
119
	ipset del blacklist_ip_blocked $ip
120
done
121
 
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###### WL set  ###########
123
# Calcul de la taille / Compute the length
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wl_set_length=$(($(wc -l $DNSMASQ_WL_ENABLED/* | awk '{print $1}' | tail -n 1)*3))
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# Chargement Loading
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echo "create whitelist_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
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cat $WL_IP_OSSI >> $TMP_set_save
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ipset -! restore < $TMP_set_save
129
rm -f $TMP_set_save
130
 
131
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET 
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# Restoring the connected users SETs if available, otherwise creating SETs
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if [ -e $TMP_users_set_save ];
134
then
135
	ipset -! restore < $TMP_users_set_save
136
	rm -f $TMP_users_set_save
137
else
138
	ipset create no_filtering_set hash:net hashsize 1024
139
	ipset create havp_set hash:net hashsize 1024
140
	ipset create havp_bl_set hash:net hashsize 1024
141
	ipset create havp_wl_set hash:net hashsize 1024
142
fi
143
 
472 richard 144
#############################
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#       PREROUTING          #
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#############################
1453 franck 147
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
148
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 149
#$IPTABLES -A PREROUTING -t mangle -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp -m tcp --dport 80 -m string --string 'GET http' --algo bm --from 50 --to 70 -j MARK --set-mark 10
1453 franck 150
 
1486 richard 151
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
783 richard 152
# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
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$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 155
 
1486 richard 156
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
157
# Mark (and log) the 8090 direct attempts to REJECT them in INPUT rules
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$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8090 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
160
 
1484 richard 161
# Marquage des paquets qui tentent d'accéder directement au port udp 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
162
# Mark the udp 54 direct attempts (DNS-blacklist) to REJECT them in INPUT rules
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
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1484 richard 165
# Marquage des paquets qui tentent d'accéder directement au port udp 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
166
# Mark the udp 55 direct attempts (DNS-whitelist) to REJECT them in INPUT rules
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
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1484 richard 169
# Marquage des paquets qui tentent d'accéder directement au port udp 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
170
# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
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1544 richard 173
# redirection DNS des usagers 'havp_bl' vers le port 54
174
# redirect DNS of 'havp_bl' users to port 54
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$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
1393 richard 176
 
1544 richard 177
# redirection DNS des usagers 'havp_wl' vers le port 55
178
# redirect DNS of 'havp_bl' users to port 55
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$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
180
 
1544 richard 181
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow. 
182
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
183
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_bl_set src ! -d $PRIVATE_IP -p tcp --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_http -- ACCEPT "
184
 
185
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
186
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
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$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
188
 
1544 richard 189
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
190
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1393 richard 191
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set havp_wl_set src -m set ! --match-set whitelist_ip_allowed dst -p tcp --dport http -j REDIRECT --to-port 80
192
 
1544 richard 193
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 194
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
195
$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
196
 
1544 richard 197
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 198
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1484 richard 199
$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
1544 richard 200
$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
1364 richard 201
 
783 richard 202
# Redirection des requêtes NTP vers le serveur NTP local
203
# Redirect NTP request in local NTP server
204
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
205
 
472 richard 206
#############################
783 richard 207
#         INPUT             #
472 richard 208
#############################
871 richard 209
 
783 richard 210
# Tout passe sur loopback
211
# accept all on loopback
212
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 213
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 214
 
215
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
216
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 217
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
218
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
219
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
220
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 221
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 222
 
1587 richard 223
# Si configéré, on autorise les réponses DHCP 
224
# Allow DHCP answers if configured
225
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
226
if [[ "$public_ip_mask" == "dhcp" ]]
227
then
228
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
229
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
230
fi
871 richard 231
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
232
# Drop broadcast & multicast on EXTIF to avoid log 
783 richard 233
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 234
 
783 richard 235
# On autorise les retours de connexions légitimes par INPUT
236
# Conntrack on INPUT
237
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 238
 
1221 richard 239
# On interdit les connexions directes au port utilisé par DansGuardian (8080). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
1486 richard 240
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 241
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 242
 
783 richard 243
# Autorisation des connexions légitimes à DansGuardian 
244
# Allow connections for DansGuardian
245
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 246
 
1486 richard 247
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
248
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
249
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
250
 
251
# Autorisation des connexions légitimes vers tinyproxy 
252
# Allow connections to tinyproxy
253
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
254
 
1472 richard 255
# On interdit les connexions directes au port UDP 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
256
# Deny direct connections on UDP 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 257
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
791 richard 258
 
1472 richard 259
# On interdit les connexions directes au port UDP 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
260
# Deny direct connections on UDP 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 261
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
1364 richard 262
 
1472 richard 263
# On interdit les connexions directes au port UDP 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
264
# Deny direct connections on UDP 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 265
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
1472 richard 266
 
1364 richard 267
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
268
# Allow connections for DNSMASQ (with blacklist)
783 richard 269
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
270
 
1364 richard 271
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
272
# Allow connections for DNSMASQ (with whitelist)
273
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
274
 
1472 richard 275
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
276
# Allow connections for DNSMASQ (blackhole mode)
277
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
278
 
783 richard 279
# Accès direct aux services internes
280
# Internal services access
1364 richard 281
$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 282
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
283
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
284
$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
285
$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
286
$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
287
$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 288
 
289
# SSHD rules if activate 
290
if [ $SSH = on ]
520 richard 291
	then
783 richard 292
	$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"
293
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1063 richard 294
	$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 295
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 296
fi
783 richard 297
 
298
# Insertion de règles locales
299
# Here, we add local rules (i.e. VPN from Internet)
300
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
301
        . /usr/local/etc/alcasar-iptables-local.sh
302
fi
303
 
304
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
305
# Deny and log on INPUT from the LAN
306
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
307
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
308
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
309
 
1393 richard 310
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 311
# Reject INTIF access (only when chilli is down)
312
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
313
$IPTABLES -A INPUT -i $INTIF -j REJECT
314
 
315
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
316
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
317
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
318
 
319
#############################
320
#        FORWARD            #
321
#############################
322
 
1364 richard 323
# Blocage des IPs du SET blacklist_ip_blocked pour le SET havp_bl_set
324
# Deny IPs of the SET blacklist_ip_blocked for the set havp_bl_set
325
$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
326
$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
327
$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
328
 
783 richard 329
# Rejet des requêtes DNS vers Internet
330
# Deny forward DNS
331
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
332
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
333
 
815 richard 334
# Autorisation des retours de connexions légitimes
335
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 336
 
1364 richard 337
#  If protocols filter is activate
1488 richard 338
if [ $PROTOCOLS_FILTERING = on ]; then
339
	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...) 
340
	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
341
	if [ $nb_uamallowed != "0" ]
342
	then
343
		while read ip_allowed_line 
344
		do
345
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
346
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
347
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
348
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
349
		done < /usr/local/etc/alcasar-uamallowed
350
	fi
351
	# Autorisation du HTTP et des protocoles non commentés
352
	# Allow HTTP and non comment protocols
353
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
354
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NETFLOW
355
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ACCEPT
356
	while read svc_line
357
	do
358
		svc_on=`echo $svc_line|cut -b1`
359
		if [ $svc_on != "#" ]
360
		then	
361
			svc_name=`echo $svc_line|cut -d" " -f1`
362
			svc_port=`echo $svc_line|cut -d" " -f2`
363
			if [ $svc_name = "icmp" ]
364
			then
365
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
366
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT 
367
			else
492 franck 368
 
1488 richard 369
				$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 "
370
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
371
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
372
				$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 "
373
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
374
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
375
			fi
376
		fi
377
	done < /usr/local/etc/alcasar-services
378
	# Rejet explicite des autres protocoles
379
	# reject the others protocols
380
	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
381
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
382
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
383
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT 
384
fi
385
 
492 franck 386
#  If QOS is activate  #
612 richard 387
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 388
	. /usr/local/etc/alcasar-iptables-qos.sh 	
389
fi
390
 
498 richard 391
# Autorisation des connections sortant du LAN  
476 richard 392
# Allow forward connections with log
1221 richard 393
#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
1159 crox53 394
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 395
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 396
 
783 richard 397
#############################
398
#         OUTPUT            #
399
#############################
1159 crox53 400
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
401
# Everything is allowed but traffic through outside network interface
498 richard 402
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 403
 
1587 richard 404
# Si configéré, on autorise les requêtes DHCP 
405
# Allow DHCP requests if configured
406
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
407
if [[ "$public_ip_mask" == "dhcp" ]]
408
then
409
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
410
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
411
fi
412
 
503 richard 413
# On autorise les requêtes DNS vers les serveurs DNS identifiés 
498 richard 414
# Allow DNS requests to identified DNS servers
415
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 416
 
615 richard 417
# On autorise les requêtes HTTP sortantes
498 richard 418
# HTTP requests are allowed
1159 crox53 419
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 420
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 421
 
784 richard 422
# On autorise les requêtes FTP 
423
# FTP requests are allowed
424
modprobe ip_conntrack_ftp
425
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 426
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 427
 
615 richard 428
# On autorise les requêtes NTP 
498 richard 429
# NTP requests are allowed
430
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 431
 
503 richard 432
# On autorise les requêtes ICMP (ping) 
433
# ICMP (ping) requests are allowed
434
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 435
 
615 richard 436
# On autorise les requêtes LDAP si un serveur externe est configué
437
# LDAP requests are allowed if an external server is declared
438
if [ $LDAP = on ]
439
	then
694 franck 440
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
441
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 442
fi
783 richard 443
 
444
#############################
445
#       POSTROUTING         #
446
#############################
498 richard 447
# Traduction dynamique d'adresse en sortie
476 richard 448
# Dynamic NAT on EXTIF
1 root 449
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
450
 
476 richard 451
# End of script
1 root 452