Subversion Repositories ALCASAR

Rev

Rev 1585 | Rev 1588 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log

Rev Author Line No. Line
872 richard 1 
#!/bin/bash
64 franck 2 
# $Id: alcasar-iptables.sh 1587 2015-03-08 22:34:21Z 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
675 richard 5 
# Rexy - 3abtux - CPN
6 
#
7 
# Reminders
1221 richard 8 
# There are four channels for log :
1294 richard 9 
#	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)
1294 richard 11 
#	3 SSH on ALCASAR with the Ulog group 2;
12 
#	4 extern access attempts on ALCASAR with the Ulog group 3.
1469 richard 13 
# The bootps/dhcp (67) port is always open on tun0/INTIF by coova
14 
CONF_FILE="/usr/local/etc/alcasar.conf"
1587 richard 15 
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
1469 richard 18 
private_ip_mask=`grep ^PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
615 richard 19 
private_ip_mask=${private_ip_mask:=192.168.182.1/24}
783 richard 20 
PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
604 richard 21 
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= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
1585 richard 25 
if [[ "$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"
1587 richard 28 
	public_ip_mask=`ip addr show $EXTIF | egrep -o $PTN`
1585 richard 29 
	dns1=`grep ^nameserver /etc/resolv.conf|cut -d" " -f2|head -n 1`
30 
	nb_dns=`grep ^nameserver /etc/resolv.conf|wc -l`
31 
	if [ $nb_dns == 2 ]
32 
	then
33 
		dns2=`grep ^nameserver /etc/resolv.conf|cut -d" " -f2|tail -n 1`
34 
	fi
35 
else
36 
	dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`
37 
	dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`
38 
fi
783 richard 39 
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
615 richard 40 
dns1=${dns1:=208.67.220.220}
41 
dns2=${dns2:=208.67.222.222}
1585 richard 42 
DNSSERVERS="$dns1,$dns2"						# first and second public DNS servers
1469 richard 43 
PROTOCOLS_FILTERING=`grep ^PROTOCOLS_FILTERING= $CONF_FILE|cut -d"=" -f2`	# Network protocols filter (on/off)
615 richard 44 
PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
1332 richard 45 
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1339 richard 46 
BL_IP_OSSI="/usr/local/share/iptables-bl/ossi"				# ossi categoty
1377 richard 47 
WL_IP_OSSI="/usr/local/share/ossi-ip-wl"				# ip of the whitelist
1393 richard 48 
DNSMASQ_WL_ENABLED="/usr/local/share/dnsmasq-wl-enabled"		# enabled domain names for the Whitelist
1364 richard 49 
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set
50 
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
1469 richard 51 
QOS=`grep ^QOS= $CONF_FILE|cut -d"=" -f2`				# QOS (on/off)
615 richard 52 
QOS=${QOS:=off}
1469 richard 53 
SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
615 richard 54 
SSH=${SSH:=off}
1469 richard 55 
SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
1063 richard 56 
SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
1469 richard 57 
LDAP=`grep ^LDAP= $CONF_FILE|cut -d"=" -f2`				# LDAP external server active (on/off)
615 richard 58 
LDAP=${LDAP:=off}
1469 richard 59 
LDAP_IP=`grep ^LDAP_IP= $CONF_FILE|cut -d"=" -f2`			# WAN IP address to reduce LDAP WAN access (all ip allowed on LAN side)
768 richard 60 
LDAP_IP=${LDAP_IP:="0.0.0.0/0.0.0.0"}
612 richard 61 
IPTABLES="/sbin/iptables"
1339 richard 62 
IP_REHABILITEES="/etc/dansguardian/lists/exceptioniplist"		# Rehabilitated IP
1364 richard 63 
SAVE_DIR="/etc/sysconfig"						# Saving path
1 root 64 
 
1364 richard 65 
# Sauvegarde des SET des utilisateurs connectés si ils existent
66 
# Saving SET of connected users if it exists
67 
ipset list no_filtering_set 1>/dev/null 2>&1
68 
if [ $? -eq 0 ];
69 
then
70 
	ipset save no_filtering_set > $TMP_users_set_save
71 
	ipset save havp_set >> $TMP_users_set_save
72 
	ipset save havp_bl_set >> $TMP_users_set_save
73 
	ipset save havp_wl_set >> $TMP_users_set_save
74 
fi
75 
 
1291 richard 76 
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 77 
modprobe ipt_NETFLOW destination=127.0.0.1:2055
78 
 
498 richard 79 
# Effacement des règles existantes
476 richard 80 
# Flush all existing rules
1 root 81 
$IPTABLES -F
82 
$IPTABLES -t nat -F
83 
$IPTABLES -t mangle -F
84 
$IPTABLES -F INPUT
85 
$IPTABLES -F FORWARD
86 
$IPTABLES -F OUTPUT
87 
 
498 richard 88 
# Suppression des chaines utilisateurs sur les tables filter et nat
89 
# Flush non default rules on filter and nat tables
90 
$IPTABLES -X
91 
$IPTABLES -t nat -X
92 
 
93 
# Stratégies par défaut
476 richard 94 
# Default policies
1 root 95 
$IPTABLES -P INPUT DROP
96 
$IPTABLES -P FORWARD DROP
498 richard 97 
$IPTABLES -P OUTPUT DROP
1 root 98 
$IPTABLES -t nat -P PREROUTING ACCEPT
99 
$IPTABLES -t nat -P POSTROUTING ACCEPT
100 
$IPTABLES -t nat -P OUTPUT ACCEPT
101 
 
1484 richard 102 
 
103 
#############################
104 
#          IPSET            #
105 
#############################
106 
 
1291 richard 107 
# destruction de tous les SET
1332 richard 108 
# destroy all SET
1291 richard 109 
ipset destroy
110 
 
1484 richard 111 
###### BL set  ###########
112 
# Calcul de la taille / Compute the length
1393 richard 113 
bl_set_length=$(($(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)+$(wc -l $BL_IP_OSSI | awk '{print $1}')))
1484 richard 114 
# Chargement / loading
1393 richard 115 
echo "create blacklist_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
116 
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 117 
do
1364 richard 118 
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 119 
done
1364 richard 120 
cat $BL_IP_OSSI >> $TMP_set_save
121 
ipset -! restore < $TMP_set_save
122 
rm -f $TMP_set_save
1484 richard 123 
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 124 
for ip in $(cat $IP_REHABILITEES)
125 
do
126 
	ipset del blacklist_ip_blocked $ip
127 
done
128 
 
1484 richard 129 
###### WL set  ###########
130 
# Calcul de la taille / Compute the length
1393 richard 131 
wl_set_length=$(($(wc -l $DNSMASQ_WL_ENABLED/* | awk '{print $1}' | tail -n 1)*3))
1484 richard 132 
# Chargement Loading
1393 richard 133 
echo "create whitelist_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1377 richard 134 
cat $WL_IP_OSSI >> $TMP_set_save
1364 richard 135 
ipset -! restore < $TMP_set_save
136 
rm -f $TMP_set_save
137 
 
138 
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 139 
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 140 
if [ -e $TMP_users_set_save ];
141 
then
142 
	ipset -! restore < $TMP_users_set_save
143 
	rm -f $TMP_users_set_save
144 
else
145 
	ipset create no_filtering_set hash:net hashsize 1024
146 
	ipset create havp_set hash:net hashsize 1024
147 
	ipset create havp_bl_set hash:net hashsize 1024
148 
	ipset create havp_wl_set hash:net hashsize 1024
149 
fi
150 
 
472 richard 151 
#############################
783 richard 152 
#       PREROUTING          #
472 richard 153 
#############################
1453 franck 154 
# Marquage des paquets qui tentent d'accéder directement à un serveur sans authentification en mode proxy pour pouvoir les rejeter en INPUT
155 
# Mark packets that attempt to directly access a server without authentication with proxy client to reject them in INPUT rules
1459 franck 156 
#$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 157 
 
1486 richard 158 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au 8080 (DansGuardian) pour pouvoir les rejeter en INPUT
783 richard 159 
# mark (and log) the dansguardian bypass attempts in order to DROP them in INPUT rules
1221 richard 160 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
783 richard 161 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
1 root 162 
 
1486 richard 163 
# Marquage (et journalisation) des paquets qui tentent d'accéder directement au port 8090 (tinyproxy) pour pouvoir les rejeter en INPUT
164 
# Mark (and log) the 8090 direct attempts to REJECT them in INPUT rules
1544 richard 165 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8090 -j ULOG --ulog-prefix "RULE direct-proxy -- DENY "
1486 richard 166 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
167 
 
1484 richard 168 
# Marquage des paquets qui tentent d'accéder directement au port udp 54 (DNS-blacklist) pour pouvoir les rejeter en INPUT
169 
# Mark the udp 54 direct attempts (DNS-blacklist) to REJECT them in INPUT rules
1486 richard 170 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
783 richard 171 
 
1484 richard 172 
# Marquage des paquets qui tentent d'accéder directement au port udp 55 (DNS-Whitelist) pour pouvoir les rejeter en INPUT
173 
# Mark the udp 55 direct attempts (DNS-whitelist) to REJECT them in INPUT rules
1486 richard 174 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
783 richard 175 
 
1484 richard 176 
# Marquage des paquets qui tentent d'accéder directement au port udp 56 (DNS-Blackhole) pour pouvoir les rejeter en INPUT
177 
# Mark the udp 56 direct attempts (DNS-blackhole) to REJECT them in INPUT rules
1486 richard 178 
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1472 richard 179 
 
1544 richard 180 
# redirection DNS des usagers 'havp_bl' vers le port 54
181 
# redirect DNS of 'havp_bl' users to port 54
1364 richard 182 
$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 183 
 
1544 richard 184 
# redirection DNS des usagers 'havp_wl' vers le port 55
185 
# redirect DNS of 'havp_bl' users to port 55
1364 richard 186 
$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
187 
 
1544 richard 188 
# Journalisation HTTP_Internet des usagers 'havp_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
189 
# Log Internet HTTP of 'havp_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
190 
$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 "
191 
 
192 
# Redirection HTTP des usagers 'havp_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
193 
# Redirect HTTP of 'havp_bl' users who want blacklist IP to ALCASAR ('access denied' page)
1364 richard 194 
$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
195 
 
1544 richard 196 
# Redirection HTTP des usagers 'havp_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
197 
# Redirect HTTP of 'havp_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
1393 richard 198 
$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
199 
 
1544 richard 200 
# Redirection des requêtes HTTP sortantes des usagers 'havp_bl' vers DansGuardian
1484 richard 201 
# Redirect outbound HTTP requests of "BL" users to DansGuardian (transparent proxy)
202 
$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
203 
 
1544 richard 204 
# Redirection des requêtes HTTP sortantes des usager 'havp_wl' et 'havp' vers Tinyproxy
1486 richard 205 
# Redirect outbound HTTP requests for "WL-antivirus" users to Tinyproxy
1484 richard 206 
$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 207 
$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 208 
 
783 richard 209 
# Redirection des requêtes NTP vers le serveur NTP local
210 
# Redirect NTP request in local NTP server
211 
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
212 
 
472 richard 213 
#############################
783 richard 214 
#         INPUT             #
472 richard 215 
#############################
871 richard 216 
 
783 richard 217 
# Tout passe sur loopback
218 
# accept all on loopback
219 
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 220 
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 221 
 
222 
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
223 
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 224 
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
225 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
226 
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
227 
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
675 richard 228 
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m state --state NEW -j DROP
498 richard 229 
 
1587 richard 230 
# Si configéré, on autorise les réponses DHCP
231 
# Allow DHCP answers if configured
232 
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
233 
if [[ "$public_ip_mask" == "dhcp" ]]
234 
then
235 
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
236 
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
237 
fi
871 richard 238 
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
239 
# Drop broadcast & multicast on EXTIF to avoid log
783 richard 240 
$IPTABLES -A INPUT -i $EXTIF -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 241 
 
783 richard 242 
# On autorise les retours de connexions légitimes par INPUT
243 
# Conntrack on INPUT
244 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
373 richard 245 
 
1221 richard 246 
# 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 247 
# Deny direct connections on DansGuardian port (8080). The concerned paquets have been marked and logged in mangle table (PREROUTING)
783 richard 248 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset
791 richard 249 
 
783 richard 250 
# Autorisation des connexions légitimes à DansGuardian
251 
# Allow connections for DansGuardian
252 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m state --state NEW --syn -j ACCEPT
373 richard 253 
 
1486 richard 254 
# On interdit les connexions directes au port utilisé par tinyproxy (8090). Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
255 
# Deny direct connections on tinyproxy port (8090). The concerned paquets have been marked in mangle table (PREROUTING)
256 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset
257 
 
258 
# Autorisation des connexions légitimes vers tinyproxy
259 
# Allow connections to tinyproxy
260 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m state --state NEW --syn -j ACCEPT
261 
 
1472 richard 262 
# On interdit les connexions directes au port UDP 54 (DNS-blacklist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
263 
# Deny direct connections on UDP 54 (DNS-blacklist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 264 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
791 richard 265 
 
1472 richard 266 
# On interdit les connexions directes au port UDP 55 (DNS-whitelist). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
267 
# Deny direct connections on UDP 55 (DNS-whitelist). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 268 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
1364 richard 269 
 
1472 richard 270 
# On interdit les connexions directes au port UDP 56 (DNS-Blackhole). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
271 
# Deny direct connections on UDP 56 (DNS-blackhole). The concerned paquets are marked in mangle table (PREROUTING)
1486 richard 272 
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
1472 richard 273 
 
1364 richard 274 
# autorisation des connexion légitime à DNSMASQ (avec blacklist)
275 
# Allow connections for DNSMASQ (with blacklist)
783 richard 276 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
277 
 
1364 richard 278 
# autorisation des connexion légitime à DNSMASQ (avec whitelist)
279 
# Allow connections for DNSMASQ (with whitelist)
280 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
281 
 
1472 richard 282 
# autorisation des connexion légitime à DNSMASQ (mode blackhole)
283 
# Allow connections for DNSMASQ (blackhole mode)
284 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
285 
 
783 richard 286 
# Accès direct aux services internes
287 
# Internal services access
1364 richard 288 
$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 289 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
290 
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
291 
$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
292 
$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
293 
$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
294 
$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 295 
 
296 
# SSHD rules if activate
297 
if [ $SSH = on ]
520 richard 298 
	then
783 richard 299 
	$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"
300 
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
1063 richard 301 
	$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 302 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
520 richard 303 
fi
783 richard 304 
 
305 
# Insertion de règles locales
306 
# Here, we add local rules (i.e. VPN from Internet)
307 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
308 
        . /usr/local/etc/alcasar-iptables-local.sh
309 
fi
310 
 
311 
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
312 
# Deny and log on INPUT from the LAN
313 
$IPTABLES -A INPUT -i $TUNIF -m state --state NEW -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
314 
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
315 
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
316 
 
1393 richard 317 
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 318 
# Reject INTIF access (only when chilli is down)
319 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE Protect1 -- REJECT "
320 
$IPTABLES -A INPUT -i $INTIF -j REJECT
321 
 
322 
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
323 
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
324 
$IPTABLES -A INPUT -i $EXTIF -m state --state NEW -j ULOG --ulog-nlgroup 3 --ulog-qthreshold 10 --ulog-prefix "RULE rej-ext -- DROP"
325 
 
326 
#############################
327 
#        FORWARD            #
328 
#############################
329 
 
1364 richard 330 
# Blocage des IPs du SET blacklist_ip_blocked pour le SET havp_bl_set
331 
# Deny IPs of the SET blacklist_ip_blocked for the set havp_bl_set
332 
$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
333 
$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
334 
$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
335 
 
783 richard 336 
# Rejet des requêtes DNS vers Internet
337 
# Deny forward DNS
338 
$IPTABLES -A FORWARD -i $TUNIF -p udp --dport domain -j REJECT --reject-with icmp-port-unreachable
339 
$IPTABLES -A FORWARD -i $TUNIF -p tcp --dport domain -j REJECT --reject-with tcp-reset
340 
 
815 richard 341 
# Autorisation des retours de connexions légitimes
342 
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
790 richard 343 
 
1364 richard 344 
#  If protocols filter is activate
1488 richard 345 
if [ $PROTOCOLS_FILTERING = on ]; then
346 
	# Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
347 
	nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
348 
	if [ $nb_uamallowed != "0" ]
349 
	then
350 
		while read ip_allowed_line
351 
		do
352 
			ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
353 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
354 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j NETFLOW
355 
			$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m state --state NEW -j ACCEPT
356 
		done < /usr/local/etc/alcasar-uamallowed
357 
	fi
358 
	# Autorisation du HTTP et des protocoles non commentés
359 
	# Allow HTTP and non comment protocols
360 
	$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 "
361 
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j NETFLOW
362 
	$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport http -m state --state NEW -j ACCEPT
363 
	while read svc_line
364 
	do
365 
		svc_on=`echo $svc_line|cut -b1`
366 
		if [ $svc_on != "#" ]
367 
		then
368 
			svc_name=`echo $svc_line|cut -d" " -f1`
369 
			svc_port=`echo $svc_line|cut -d" " -f2`
370 
			if [ $svc_name = "icmp" ]
371 
			then
372 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
373 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT
374 
			else
492 franck 375 
 
1488 richard 376 
				$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 "
377 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
378 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
379 
				$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 "
380 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
381 
				$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
382 
			fi
383 
		fi
384 
	done < /usr/local/etc/alcasar-services
385 
	# Rejet explicite des autres protocoles
386 
	# reject the others protocols
387 
	$IPTABLES -A FORWARD -i $TUNIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
388 
	$IPTABLES -A FORWARD -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
389 
	$IPTABLES -A FORWARD -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
390 
	$IPTABLES -A FORWARD -i $TUNIF -p icmp -j REJECT
391 
fi
392 
 
492 franck 393 
#  If QOS is activate  #
612 richard 394 
if [ $QOS = on ] && [ -e /usr/local/etc/alcasar-iptables-qos.sh ]; then
492 franck 395 
	. /usr/local/etc/alcasar-iptables-qos.sh
396 
fi
397 
 
498 richard 398 
# Autorisation des connections sortant du LAN
476 richard 399 
# Allow forward connections with log
1221 richard 400 
#$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ULOG --ulog-prefix "RULE F_all -- ACCEPT "
1159 crox53 401 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j NETFLOW
859 richard 402 
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m state --state NEW -j ACCEPT
1 root 403 
 
783 richard 404 
#############################
405 
#         OUTPUT            #
406 
#############################
1159 crox53 407 
# On laisse tout sortir sur toutes les cartes sauf celle qui est connectée sur l'extérieur
408 
# Everything is allowed but traffic through outside network interface
498 richard 409 
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 410 
 
1587 richard 411 
# Si configéré, on autorise les requêtes DHCP
412 
# Allow DHCP requests if configured
413 
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
414 
if [[ "$public_ip_mask" == "dhcp" ]]
415 
then
416 
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
417 
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
418 
fi
419 
 
503 richard 420 
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 421 
# Allow DNS requests to identified DNS servers
422 
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m state --state NEW -j ACCEPT
783 richard 423 
 
615 richard 424 
# On autorise les requêtes HTTP sortantes
498 richard 425 
# HTTP requests are allowed
1159 crox53 426 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 427 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 428 
 
784 richard 429 
# On autorise les requêtes FTP
430 
# FTP requests are allowed
431 
modprobe ip_conntrack_ftp
432 
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
1159 crox53 433 
$IPTABLES -A OUTPUT -o $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
784 richard 434 
 
615 richard 435 
# On autorise les requêtes NTP
498 richard 436 
# NTP requests are allowed
437 
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 438 
 
503 richard 439 
# On autorise les requêtes ICMP (ping)
440 
# ICMP (ping) requests are allowed
441 
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 442 
 
615 richard 443 
# On autorise les requêtes LDAP si un serveur externe est configué
444 
# LDAP requests are allowed if an external server is declared
445 
if [ $LDAP = on ]
446 
	then
694 franck 447 
	$IPTABLES -A OUTPUT -p tcp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
448 
	$IPTABLES -A OUTPUT -p udp -d $LDAP_IP -m multiport --dports ldap,ldaps -m state --state NEW,ESTABLISHED -j ACCEPT
615 richard 449 
fi
783 richard 450 
 
451 
#############################
452 
#       POSTROUTING         #
453 
#############################
498 richard 454 
# Traduction dynamique d'adresse en sortie
476 richard 455 
# Dynamic NAT on EXTIF
1 root 456 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
457 
 
476 richard 458 
# End of script
1 root 459