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872 richard 1
#!/bin/bash
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# $Id: alcasar-iptables.sh 1854 2016-05-02 08:15:14Z raphael.pion $
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# 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 $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
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PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
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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}
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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
1852 raphael.pi 40
DIR_WL_IP_ENABLED="/usr/local/share/iptables-wl-enabled/"				# ip files repository of the WL (feature : imported wl file from ACC)
1364 richard 41
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set 
42
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
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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 54
 
1364 richard 55
# Sauvegarde des SET des utilisateurs connectés si ils existent
56
# Saving SET of connected users if it exists
57
ipset list no_filtering_set 1>/dev/null 2>&1
58
if [ $? -eq 0 ];
59
then
60
	ipset save no_filtering_set > $TMP_users_set_save
61
	ipset save havp_set >> $TMP_users_set_save
62
	ipset save havp_bl_set >> $TMP_users_set_save
63
	ipset save havp_wl_set >> $TMP_users_set_save
1818 raphael.pi 64
	ipset save user_not_connected_yet >> $TMP_users_set_save
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	ipset save ipset_users_list >> $TMP_users_set_save
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fi
67
 
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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
70
 
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# Effacement des règles existantes
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# Flush all existing rules
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$IPTABLES -F
74
$IPTABLES -t nat -F
75
$IPTABLES -t mangle -F
76
$IPTABLES -F INPUT
77
$IPTABLES -F FORWARD
78
$IPTABLES -F OUTPUT
79
 
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# Suppression des chaines utilisateurs sur les tables filter et nat
81
# Flush non default rules on filter and nat tables
82
$IPTABLES -X
83
$IPTABLES -t nat -X
84
 
85
# Stratégies par défaut
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# Default policies
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$IPTABLES -P INPUT DROP
88
$IPTABLES -P FORWARD DROP
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$IPTABLES -P OUTPUT DROP
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$IPTABLES -t nat -P PREROUTING ACCEPT
91
$IPTABLES -t nat -P POSTROUTING ACCEPT
92
$IPTABLES -t nat -P OUTPUT ACCEPT
93
 
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95
#############################
96
#          IPSET            #
97
#############################
98
 
1291 richard 99
# destruction de tous les SET
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# destroy all SET
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ipset destroy
1854 raphael.pi 102
ipset flush blacklist_ip_blocked
103
ipset destroy blacklist_ip_blocked
104
ipset flush whitelist_ip_allowed
105
ipset destroy whitelist_ip_allowed
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1854 raphael.pi 107
 
1484 richard 108
###### BL set  ###########
109
# 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}')))
1854 raphael.pi 111
 
112
 
1484 richard 113
# Chargement / loading
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echo "create blacklist_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
115
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
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do
1364 richard 117
	cat $BL_IP_CAT/$category >> $TMP_set_save
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done
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cat $BL_IP_OSSI >> $TMP_set_save
120
ipset -! restore < $TMP_set_save
121
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)
124
do
125
	ipset del blacklist_ip_blocked $ip
126
done
127
 
1484 richard 128
###### WL set  ###########
129
# Calcul de la taille / Compute the length
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wl_set_length=$(($(wc -l $DIR_WL_IP_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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#get ip-wl files from ACC
134
for ossi in `ls -1 $DIR_WL_IP_ENABLED`
135
do
136
	echo $ossi
137
	cat $DIR_WL_IP_ENABLED/$ossi >> $TMP_set_save
138
done
1364 richard 139
ipset -! restore < $TMP_set_save
140
rm -f $TMP_set_save
141
 
142
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET 
1377 richard 143
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 144
if [ -e $TMP_users_set_save ];
145
then
146
	ipset -! restore < $TMP_users_set_save
147
	rm -f $TMP_users_set_save
148
else
149
	ipset create no_filtering_set hash:net hashsize 1024
150
	ipset create havp_set hash:net hashsize 1024
151
	ipset create havp_bl_set hash:net hashsize 1024
152
	ipset create havp_wl_set hash:net hashsize 1024
1818 raphael.pi 153
	#utilisé pour l'interception des utilisateurs non authentifiés au réseau
154
	#used for intercepting users not connected to the network
155
	ipset create user_not_connected_yet hash:net hashsize 1024
156
	ipset create ipset_users_list list:set
157
	ipset add ipset_users_list havp_set
158
	ipset add ipset_users_list havp_wl_set
159
	ipset add ipset_users_list havp_bl_set
160
	ipset add ipset_users_list no_filtering_set
161
	ipset add ipset_users_list user_not_connected_yet
1364 richard 162
fi
163
 
472 richard 164
#############################
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#       PREROUTING          #
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#############################
1827 raphael.pi 167
 
168
# Redirection des requetes DNS des utilisateurs non connectés dans le DNS-Blackhole
169
# Redirect users not connected DNS requests in DNS-Blackhole
170
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set ! --match-set ipset_users_list src -d $PRIVATE_IP -p tcp --dport domain -j REDIRECT --to-port 56
171
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set ! --match-set ipset_users_list src -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 56
172
 
173
 
1453 franck 174
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
175
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 176
#$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 177
 
1486 richard 178
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
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# 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 $PRIVATE_IP -m tcp --dport 8080 -j NFLOG --nflog-prefix "RULE direct-proxy -- DENY "
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$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 182
 
1486 richard 183
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
184
# 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 NFLOG --nflog-prefix "RULE direct-proxy -- DENY "
1486 richard 186
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
187
 
1484 richard 188
# Marquage des paquets qui tentent d'accéder directement au port udp 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
189
# Mark the udp 54 direct attempts (DNS-blacklist) to REJECT them in INPUT rules
1486 richard 190
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
783 richard 191
 
1484 richard 192
# Marquage des paquets qui tentent d'accéder directement au port udp 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
193
# Mark the udp 55 direct attempts (DNS-whitelist) to REJECT them in INPUT rules
1486 richard 194
$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 196
# Marquage des paquets qui tentent d'accéder directement au port udp 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
197
# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules
1486 richard 198
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1472 richard 199
 
1544 richard 200
# redirection DNS des usagers 'havp_bl' vers le port 54
201
# redirect DNS of 'havp_bl' users to port 54
1364 richard 202
$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 203
 
1544 richard 204
# redirection DNS des usagers 'havp_wl' vers le port 55
205
# redirect DNS of 'havp_bl' users to port 55
1364 richard 206
$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
207
 
1544 richard 208
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow. 
209
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
1704 richard 210
$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 NFLOG --nflog-prefix "RULE F_http -- ACCEPT "
1544 richard 211
 
212
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
213
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1364 richard 214
$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
215
 
1544 richard 216
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
217
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1393 richard 218
$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
219
 
1544 richard 220
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 221
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
222
$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
223
 
1544 richard 224
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 225
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1484 richard 226
$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 227
$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 228
 
783 richard 229
# Redirection des requêtes NTP vers le serveur NTP local
230
# Redirect NTP request in local NTP server
231
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
232
 
472 richard 233
#############################
783 richard 234
#         INPUT             #
472 richard 235
#############################
871 richard 236
 
783 richard 237
# Tout passe sur loopback
238
# accept all on loopback
239
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 240
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 241
 
242
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
243
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 244
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
245
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
246
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
247
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 248
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 249
 
1587 richard 250
# Si configéré, on autorise les réponses DHCP 
251
# Allow DHCP answers if configured
252
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
253
if [[ "$public_ip_mask" == "dhcp" ]]
254
then
255
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
256
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
257
fi
871 richard 258
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
259
# Drop broadcast & multicast on EXTIF to avoid log 
1629 richard 260
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 261
 
783 richard 262
# On autorise les retours de connexions légitimes par INPUT
263
# Conntrack on INPUT
264
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 265
 
1221 richard 266
# 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 267
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 268
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 269
 
783 richard 270
# Autorisation des connexions légitimes à DansGuardian 
271
# Allow connections for DansGuardian
272
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 273
 
1486 richard 274
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
275
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
276
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
277
 
278
# Autorisation des connexions légitimes vers tinyproxy 
279
# Allow connections to tinyproxy
280
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
281
 
1472 richard 282
# On interdit les connexions directes au port UDP 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
283
# Deny direct connections on UDP 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 284
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
791 richard 285
 
1472 richard 286
# On interdit les connexions directes au port UDP 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
287
# Deny direct connections on UDP 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 288
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
1364 richard 289
 
1472 richard 290
# On interdit les connexions directes au port UDP 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
291
# Deny direct connections on UDP 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 292
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
1472 richard 293
 
1364 richard 294
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
295
# Allow connections for DNSMASQ (with blacklist)
783 richard 296
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
297
 
1364 richard 298
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
299
# Allow connections for DNSMASQ (with whitelist)
300
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
301
 
1472 richard 302
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
303
# Allow connections for DNSMASQ (blackhole mode)
304
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
305
 
783 richard 306
# Accès direct aux services internes
307
# Internal services access
1364 richard 308
$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 309
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
310
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
311
$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
312
$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
313
$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
314
$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 315
 
316
# SSHD rules if activate 
317
if [ $SSH = on ]
520 richard 318
	then
1731 richard 319
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-LAN -- ACCEPT"
783 richard 320
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1731 richard 321
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT"
1161 richard 322
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 323
fi
783 richard 324
 
325
# Insertion de règles locales
326
# Here, we add local rules (i.e. VPN from Internet)
327
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
328
        . /usr/local/etc/alcasar-iptables-local.sh
329
fi
330
 
331
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
332
# Deny and log on INPUT from the LAN
1704 richard 333
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j NFLOG --nflog-prefix "RULE rej-int -- REJECT "
783 richard 334
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
335
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
336
 
1393 richard 337
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 338
# Reject INTIF access (only when chilli is down)
1704 richard 339
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 340
$IPTABLES -A INPUT -i $INTIF -j REJECT
341
 
342
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
343
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
1731 richard 344
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j NFLOG --nflog-group 3 --nflog-threshold 10 --nflog-prefix "RULE rej-ext -- DROP"
783 richard 345
 
346
#############################
347
#        FORWARD            #
348
#############################
349
 
1364 richard 350
# Blocage des IPs du SET blacklist_ip_blocked pour le SET havp_bl_set
351
# Deny IPs of the SET blacklist_ip_blocked for the set havp_bl_set
352
$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
353
$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
354
$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
355
 
783 richard 356
# Rejet des requêtes DNS vers Internet
357
# Deny forward DNS
358
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
359
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
360
 
815 richard 361
# Autorisation des retours de connexions légitimes
362
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 363
 
1364 richard 364
#  If protocols filter is activate
1488 richard 365
if [ $PROTOCOLS_FILTERING = on ]; then
366
	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...) 
367
	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
368
	if [ $nb_uamallowed != "0" ]
369
	then
370
		while read ip_allowed_line 
371
		do
372
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
1704 richard 373
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NFLOG --nflog-prefix "RULE IP-allowed -- ACCEPT "
1488 richard 374
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
375
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
376
		done < /usr/local/etc/alcasar-uamallowed
377
	fi
378
	# Autorisation du HTTP et des protocoles non commentés
379
	# Allow HTTP and non comment protocols
1704 richard 380
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
1488 richard 381
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NETFLOW
382
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ACCEPT
383
	while read svc_line
384
	do
385
		svc_on=`echo $svc_line|cut -b1`
386
		if [ $svc_on != "#" ]
387
		then	
388
			svc_name=`echo $svc_line|cut -d" " -f1`
389
			svc_port=`echo $svc_line|cut -d" " -f2`
390
			if [ $svc_name = "icmp" ]
391
			then
392
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
393
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT 
394
			else
492 franck 395
 
1704 richard 396
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NFLOG --nflog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
1488 richard 397
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
398
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
1704 richard 399
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NFLOG --nflog-prefix "RULE F_UDP-$svc_name -- ACCEPT "
1488 richard 400
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
401
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
402
			fi
403
		fi
404
	done < /usr/local/etc/alcasar-services
405
	# Rejet explicite des autres protocoles
406
	# reject the others protocols
1704 richard 407
	$IPTABLES -A FORWARD -i $TUNIF -j NFLOG --nflog-prefix "RULE F_filter -- REJECT "
1488 richard 408
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
409
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
410
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT 
411
fi
412
 
498 richard 413
# Autorisation des connections sortant du LAN  
476 richard 414
# Allow forward connections with log
1221 richard 415
#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
1159 crox53 416
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 417
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 418
 
783 richard 419
#############################
420
#         OUTPUT            #
421
#############################
1159 crox53 422
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
423
# Everything is allowed but traffic through outside network interface
498 richard 424
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 425
 
1587 richard 426
# Si configéré, on autorise les requêtes DHCP 
427
# Allow DHCP requests if configured
428
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
429
if [[ "$public_ip_mask" == "dhcp" ]]
430
then
431
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
432
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
433
fi
434
 
503 richard 435
# On autorise les requêtes DNS vers les serveurs DNS identifiés 
498 richard 436
# Allow DNS requests to identified DNS servers
437
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 438
 
615 richard 439
# On autorise les requêtes HTTP sortantes
498 richard 440
# HTTP requests are allowed
1159 crox53 441
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 442
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 443
 
784 richard 444
# On autorise les requêtes FTP 
445
# FTP requests are allowed
1705 richard 446
modprobe nf_conntrack_ftp
784 richard 447
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 448
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 449
 
615 richard 450
# On autorise les requêtes NTP 
498 richard 451
# NTP requests are allowed
452
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 453
 
503 richard 454
# On autorise les requêtes ICMP (ping) 
455
# ICMP (ping) requests are allowed
456
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 457
 
615 richard 458
# On autorise les requêtes LDAP si un serveur externe est configué
459
# LDAP requests are allowed if an external server is declared
460
if [ $LDAP = on ]
461
	then
694 franck 462
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
463
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 464
fi
783 richard 465
 
466
#############################
467
#       POSTROUTING         #
468
#############################
498 richard 469
# Traduction dynamique d'adresse en sortie
476 richard 470
# Dynamic NAT on EXTIF
1 root 471
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
472
 
476 richard 473
# End of script
1 root 474