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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 3041 2022-07-20 21:06:54Z rexy $
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);
2454 tom.houday 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.
2454 tom.houday 13
# The bootps/dhcp (67) port is always open on tun0/INTIF by coova
1469 richard 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
fi
783 richard 30
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
1588 richard 31
dns1=`grep ^DNS1= $CONF_FILE|cut -d"=" -f2`
32
dns2=`grep ^DNS2= $CONF_FILE|cut -d"=" -f2`
615 richard 33
dns1=${dns1:=208.67.220.220}
34
dns2=${dns2:=208.67.222.222}
1585 richard 35
DNSSERVERS="$dns1,$dns2"						# first and second public DNS servers
2688 lucas.echa 36
INT_DNS_IP=`grep INT_DNS_IP $CONF_FILE|cut -d"=" -f2`			# Adresse du serveur DNS interne
37
INT_DNS_ACTIVE=`grep INT_DNS_ACTIVE $CONF_FILE|cut -d"=" -f2`	# Activation de la redirection DNS interne
1332 richard 38
BL_IP_CAT="/usr/local/share/iptables-bl-enabled"			# categories files of the BlackListed IP
1932 richard 39
WL_IP_CAT="/usr/local/share/iptables-wl-enabled"			# categories files of the WhiteListed IP
2454 tom.houday 40
TMP_users_set_save="/tmp/users_set_save"				# tmp file for backup users set
1364 richard 41
TMP_set_save="/tmp/ipset_save"						# tmp file for blacklist and whitelist creation
2956 rexy 42
TMP_ip_gw_save="/tmp/ipset_ip_gw_save"				# tmp file for already connected ips
1469 richard 43
SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
615 richard 44
SSH=${SSH:=off}
3041 rexy 45
SSH_LAN=`grep ^SSH_LAN= $CONF_FILE|cut -d"=" -f2`			# local SSH active
46
SSH_LAN=${SSH_LAN:=off}
3040 rexy 47
SSH_PORT=`grep ^SSH_WAN= $CONF_FILE|cut -d"=" -f2`		#ssh WAN port
48
SSH_PORT=${SSH_PORT:=0}
1469 richard 49
SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
1063 richard 50
SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}			# WAN IP address to reduce ssh access (all ip allowed on LAN side)
612 richard 51
IPTABLES="/sbin/iptables"
2521 armand.ito 52
IP_REHABILITEES="/etc/e2guardian/lists/exceptioniplist"		# Rehabilitated IP
2841 rexy 53
SITE_DIRECT="/usr/local/etc/alcasar-site-direct"			# WEB Sites allowed for all (no av and no filtering for av_bl users)
2956 rexy 54
MULTIWAN=`grep ^MULTIWAN $CONF_FILE|cut -d"=" -f2`
55
PROXY=`grep ^PROXY= $CONF_FILE|cut -d"=" -f2`
56
PROXY_IP=`grep ^PROXY_IP= $CONF_FILE|cut -d"=" -f2`
57
nb_gw=`grep ^WAN $CONF_FILE|wc -l`
3040 rexy 58
HOST=`grep ^HOSTNAME= $CONF_FILE|cut -d"=" -f2`
59
DOM=`grep ^DOMAIN= $CONF_FILE|cut -d"=" -f2`
60
DOMAIN="$HOST.$DOM"
1 root 61
 
2688 lucas.echa 62
# Allow requests to internal DNS if activated
63
if [ "$INT_DNS_ACTIVE" = "on" ]
64
then
65
	DNSSERVERS="$DNSSERVERS,$INT_DNS_IP"
66
fi
67
 
2956 rexy 68
#ipset name list for load_balancing
69
gw_list="gw0"
70
if [ "$MULTIWAN" == "on" ] || [ "$MULTIWAN" == "On" ]; then
71
	for ((i=1 ; i<=$nb_gw ; i++)); do
72
		gw_list="${gw_list} gw$i"
73
	done
74
fi
75
 
76
 
1364 richard 77
# Sauvegarde des SET des utilisateurs connectés si ils existent
78
# Saving SET of connected users if it exists
1867 raphael.pi 79
ipset list not_filtered 1>/dev/null 2>&1
1364 richard 80
if [ $? -eq 0 ];
81
then
1867 raphael.pi 82
	ipset save not_filtered > $TMP_users_set_save
2841 rexy 83
	ipset save av >> $TMP_users_set_save
84
	ipset save av_bl >> $TMP_users_set_save
85
	ipset save av_wl >> $TMP_users_set_save
2006 raphael.pi 86
	ipset save proto_0 >> $TMP_users_set_save
87
	ipset save proto_1 >> $TMP_users_set_save
88
	ipset save proto_2 >> $TMP_users_set_save
89
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 90
fi
91
 
2956 rexy 92
# Sauvegarde de la liste de toutes les IP déjà connectées pour les réintégrer dans le load balancing
93
# Saving all of the already connected IP in order to put them back in the load balancing after
94
if [ ! -f $TMP_ip_gw_save ];then
95
	# Save only if alcasar-network.sh --save has not been executed before
96
	for i in $gw_list;do
97
		ipset list $i 1>/dev/null 2>&1
98
		if [ $? -eq 0 ]
99
		then
100
			# the cut -d":" -f5 deletes all the lines with a :, i.e all the lines execpt the members
101
			ipset list $i | cut -d":" -f5 | sed '/^[[:space:]]*$/d' >> $TMP_ip_gw_save
102
		fi
103
	done
104
fi
105
 
2668 rexy 106
# Chargement de la sonde NetFlow (module noyau ipt_NETFLOW)
1291 richard 107
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 108
modprobe ipt_NETFLOW destination=127.0.0.1:2055
109
 
498 richard 110
# Effacement des règles existantes
476 richard 111
# Flush all existing rules
1 root 112
$IPTABLES -F
113
$IPTABLES -t nat -F
114
$IPTABLES -t mangle -F
115
$IPTABLES -F INPUT
116
$IPTABLES -F FORWARD
117
$IPTABLES -F OUTPUT
118
 
498 richard 119
# Suppression des chaines utilisateurs sur les tables filter et nat
120
# Flush non default rules on filter and nat tables
121
$IPTABLES -X
122
$IPTABLES -t nat -X
123
 
124
# Stratégies par défaut
476 richard 125
# Default policies
1 root 126
$IPTABLES -P INPUT DROP
127
$IPTABLES -P FORWARD DROP
498 richard 128
$IPTABLES -P OUTPUT DROP
1 root 129
$IPTABLES -t nat -P PREROUTING ACCEPT
130
$IPTABLES -t nat -P POSTROUTING ACCEPT
131
$IPTABLES -t nat -P OUTPUT ACCEPT
132
 
1484 richard 133
 
134
#############################
135
#          IPSET            #
136
#############################
137
 
1291 richard 138
# destruction de tous les SET
1332 richard 139
# destroy all SET
1876 raphael.pi 140
ipset flush
1291 richard 141
ipset destroy
1855 raphael.pi 142
 
1484 richard 143
###### BL set  ###########
144
# Calcul de la taille / Compute the length
1932 richard 145
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 146
# Chargement / loading
1867 raphael.pi 147
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 148
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 149
do
1364 richard 150
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 151
done
1364 richard 152
ipset -! restore < $TMP_set_save
153
rm -f $TMP_set_save
1484 richard 154
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 155
for ip in $(cat $IP_REHABILITEES)
156
do
2688 lucas.echa 157
	ipset -q del bl_ip_blocked $ip
1339 richard 158
done
159
 
2841 rexy 160
# ipset for exception web sites (usefull for filtered users = av_bl)
2485 franck 161
ipset create site_direct hash:net hashsize 1024
162
for site in $(cat $SITE_DIRECT)
163
do
2688 lucas.echa 164
    ipset add site_direct $site
2485 franck 165
done
166
 
1484 richard 167
###### WL set  ###########
2688 lucas.echa 168
# taille fixe, car peuplé par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 169
wl_set_length=65536
1484 richard 170
# Chargement Loading
1867 raphael.pi 171
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 172
#get ip-wl files from ACC
1932 richard 173
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 174
do
1932 richard 175
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 176
done
1364 richard 177
ipset -! restore < $TMP_set_save
178
rm -f $TMP_set_save
179
 
2454 tom.houday 180
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 181
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 182
if [ -e $TMP_users_set_save ];
183
then
184
	ipset -! restore < $TMP_users_set_save
185
	rm -f $TMP_users_set_save
186
else
2386 tom.houday 187
	ipset create not_filtered hash:ip hashsize 1024
2841 rexy 188
	ipset create av hash:ip hashsize 1024
189
	ipset create av_bl hash:ip hashsize 1024
190
	ipset create av_wl hash:ip hashsize 1024
2668 rexy 191
	# pour les filtrages de protocole par utilisateur / For network protocols filtering by user
2386 tom.houday 192
	ipset create proto_0 hash:ip hashsize 1024
193
	ipset create proto_1 hash:ip hashsize 1024
194
	ipset create proto_2 hash:ip hashsize 1024
195
	ipset create proto_3 hash:ip hashsize 1024
1364 richard 196
fi
197
 
2956 rexy 198
#ipsets for load balancing
199
for i in $gw_list; do
200
	ipset create $i hash:ip
201
done
202
cat $TMP_ip_gw_save | while read ip; do
203
	gw_min="gw0"
204
	weight=`grep ^PUBLIC_WEIGHT= $CONF_FILE | cut -d"=" -f2`
205
	already=`ipset list $gw_min | grep Number\ of\ entries: | cut -d":" -f2`
206
	#The *1000 is here to avoid working on floats in bash
207
	gw_min_value=$((1000 * $already / $weight))
208
	i=1
209
	for gw in $gw_list;do
210
		if [ "$gw" != "gw0" ]; then
211
			weight=`grep ^WAN$i= $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F ',' '{ print $2 }'`
212
			already=`ipset list $gw | grep Number\ of\ entries: | cut -d":" -f2`
213
			value=$((1000 * $already / $weight))
214
			if [ $value -lt $gw_min_value ]
215
			then
216
				gw_min_value=$value
217
				gw_min=$gw
218
			fi
219
			i=$(($i+1))
220
		fi
221
	done
222
	ipset add $gw_min $ip
223
done
224
rm -f $TMP_ip_gw_save
225
 
226
 
227
 
472 richard 228
#############################
783 richard 229
#       PREROUTING          #
472 richard 230
#############################
1827 raphael.pi 231
 
2956 rexy 232
 
2840 rexy 233
# Marquage (et journalisation) des paquets qui tentent d'accéder directement aux ports d'écoute du proxy HTTP/HTTPS (E2Guardian) pour pouvoir les rejeter en INPUT
234
# Mark (and log) the direct attempts to E2guardian listen ports in order to REJECT them in INPUT rules
2841 rexy 235
# 8080 = ipset av_bl
2355 tom.houday 236
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8080 -j NFLOG --nflog-group 1 --nflog-prefix "RULE direct-proxy -- DENY "
783 richard 237
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
2841 rexy 238
# 8090 = ipset av_wl + av
2355 tom.houday 239
$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8090 -j NFLOG --nflog-group 1 --nflog-prefix "RULE direct-proxy -- DENY "
1486 richard 240
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
2844 rexy 241
# 8443 = tranparent HTTPS for ipsets av_bl + av_wl + av (future version)
242
#$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8443 -j NFLOG --nflog-group 1 --nflog-prefix "RULE direct-proxy -- DENY "
243
#$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8443 -j MARK --set-mark 6
1486 richard 244
 
2840 rexy 245
# Marquage des paquets qui tentent d'accéder directement aux ports d'écoute DNS (UNBOUND) pour pouvoir les rejeter en INPUT
246
# Mark the direct attempts to DNS ports (UNBOUND) in order to REJECT them in INPUT rules
2841 rexy 247
# 54 = ipset av_bl
1486 richard 248
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 249
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
2841 rexy 250
# 55 = ipset av_wl
1486 richard 251
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 252
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
2840 rexy 253
# 56 = blackall
1486 richard 254
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 255
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 256
 
2840 rexy 257
# redirection DNS des usagers
258
# users DNS redirection
2841 rexy 259
# 54 = ipset av_bl
260
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -p udp --dport domain -j REDIRECT --to-port 54
261
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -p tcp --dport domain -j REDIRECT --to-port 54
262
# 55 = ipset av_wl
263
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -p udp --dport domain -j REDIRECT --to-port 55
264
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -p tcp --dport domain -j REDIRECT --to-port 55
2956 rexy 265
# 53 = all other users
2517 rexy 266
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 53
267
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p tcp --dport domain -j REDIRECT --to-port 53
268
 
2844 rexy 269
# Redirection HTTP des usagers 'av_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
270
# Redirect HTTP of 'av_bl' users who want blacklist IP to ALCASAR ('access denied' page)
271
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -m set --match-set bl_ip_blocked dst -p tcp --dport http -j REDIRECT --to-port 80
272
 
273
# Redirection HTTP des usagers 'av_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
274
# Redirect HTTP of 'av_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
275
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -m set ! --match-set wl_ip_allowed dst -p tcp --dport http -j REDIRECT --to-port 80
276
 
277
# Journalisation des usagers "av_bl + av_wl + av" (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
278
# accounting of "av_bl + av_wl + av"  users (only syn packets). Other protocols are logged in FORWARD by netflow
279
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src ! -d $PRIVATE_IP -p tcp --dport http -m conntrack --ctstate NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE F_http -- ACCEPT "
280
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src ! -d $PRIVATE_IP -p tcp --dport http -m conntrack --ctstate NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE F_http -- ACCEPT "
281
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av src ! -d $PRIVATE_IP -p tcp --dport http -m conntrack --ctstate NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE F_http -- ACCEPT "
282
 
283
# Redirection des requêtes HTTP des usagers "av_bl + av_wl + av" vers E2guardian
284
# Redirect outbound "av_bl + av_wl +av" users HTTP requests to E2guardian
2841 rexy 285
# 8080 = ipset av_bl
2956 rexy 286
#$IPTABLES -A PREROUTING -t mangle -i $TUNIF -m set --match-set av_bl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport http -j MARK --set-mark 200
2841 rexy 287
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport http -j REDIRECT --to-port 8080
288
# 8090 = ipset av_wl & av
289
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
290
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av src ! -d $PRIVATE_IP -p tcp --dport http -j REDIRECT --to-port 8090
2840 rexy 291
 
2844 rexy 292
# Redirection des requêtes HTTPS sortantes des usagers av_bl + av_wl + av vers E2Guardian (in a future version - don't forget to set E2guardian as a tranparent HTTPS proxy)
2841 rexy 293
# Redirect outbound HTTPS requests of av_bl + av_wl + av users to E2Guardian
2844 rexy 294
#$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport https -j REDIRECT --to-port 8443
295
#$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport https -j REDIRECT --to-port 8443
296
#$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport https -j REDIRECT --to-port 8443
2840 rexy 297
 
783 richard 298
# Redirection des requêtes NTP vers le serveur NTP local
299
# Redirect NTP request in local NTP server
300
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
301
 
2956 rexy 302
#Récupération de la marque associée à une gw pour chaque connection
303
$IPTABLES -A PREROUTING -t mangle -j CONNMARK --restore-mark
304
 
305
if [ "$PROXY" == "on" ] || [ "$PROXY" == "On" ];then
306
	$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p tcp -m multiport --dports http,https -j DNAT --to-destination $PROXY_IP
307
fi
308
 
309
#Marquage pour le load balancing
310
if [ "$MULTIWAN" == "on" ] || [ "$MULTIWAN" == "On" ]; then
311
	temp_index=200
312
	for i in $gw_list; do
313
		$IPTABLES -A PREROUTING -t mangle -i $TUNIF -m set --match-set $i src -j MARK --set-mark $temp_index
314
		temp_index=$(($temp_index+1))
315
	done
316
fi
317
 
318
 
472 richard 319
#############################
783 richard 320
#         INPUT             #
472 richard 321
#############################
871 richard 322
 
783 richard 323
# Tout passe sur loopback
324
# accept all on loopback
325
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 326
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 327
 
328
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
2956 rexy 329
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST and NEW not SYN)
472 richard 330
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
331
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
332
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
333
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
2496 tom.houday 334
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m conntrack --ctstate NEW -j DROP
498 richard 335
 
2454 tom.houday 336
# Si configéré, on autorise les réponses DHCP
1587 richard 337
# Allow DHCP answers if configured
338
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
339
if [[ "$public_ip_mask" == "dhcp" ]]
340
then
341
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
342
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
343
fi
871 richard 344
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
2454 tom.houday 345
# Drop broadcast & multicast on EXTIF to avoid log
1629 richard 346
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 347
 
783 richard 348
# On autorise les retours de connexions légitimes par INPUT
349
# Conntrack on INPUT
2496 tom.houday 350
$IPTABLES -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
373 richard 351
 
2840 rexy 352
# On interdit les connexions directes aux ports d'écoute d'E2Guardian. Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
353
# Deny direct connections on E2Guardian listen ports. The concerned paquets have been marked and logged in mangle table (PREROUTING)
2841 rexy 354
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset # av_bl
355
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset # av_wl + av
2844 rexy 356
#$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8443 -m mark --mark 6 -j REJECT --reject-with tcp-reset # av_bl + av_wl + av (future version)
791 richard 357
 
2840 rexy 358
# On autorise les connexions HTTP/HTTPS légitimes vers E2Guardian
359
# Allow HTTP connections to E2Guardian
2496 tom.houday 360
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m conntrack --ctstate NEW --syn -j ACCEPT
361
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m conntrack --ctstate NEW --syn -j ACCEPT
2844 rexy 362
#$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8443 -m conntrack --ctstate NEW --syn -j ACCEPT # (future version)
1486 richard 363
 
2840 rexy 364
# On interdit les connexions directes aux ports d'écoupe DNS (UNBOUND). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
365
# Deny direct connections to DNS ports (UNBOUND). The concerned paquets are marked in mangle table (PREROUTING)
1962 richard 366
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
367
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
368
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
2840 rexy 369
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with tcp-reset
1962 richard 370
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
2840 rexy 371
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with tcp-reset
1472 richard 372
 
2840 rexy 373
# On autorise les connexion DNS légitime
374
# Allow DNS connections
2841 rexy 375
# ipset = av_bl
783 richard 376
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 377
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
2841 rexy 378
# ipset = av_wl
1364 richard 379
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 380
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
2840 rexy 381
# blackall
1472 richard 382
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 383
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 384
 
2840 rexy 385
# On accepte l'accès aux services internes
783 richard 386
# Internal services access
2454 tom.houday 387
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
1962 richard 388
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 389
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
390
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
391
$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
392
$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
2370 tom.houday 393
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 3990:3991 -j ACCEPT	# Requêtes de deconnexion usagers # Users logout requests
786 richard 394
$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 395
 
2668 rexy 396
# Accès au serveur SSHD si activé
397
# SSHD server access if enabled
783 richard 398
if [ $SSH = on ]
520 richard 399
	then
3041 rexy 400
	if [ $SSH_LAN = on ]
401
		then
402
		$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m conntrack --ctstate NEW -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-LAN -- ACCEPT"
403
		$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
404
	fi
3040 rexy 405
	if [ $SSH_PORT -gt 0 ]
406
		then
407
		$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport $SSH_PORT -m conntrack --ctstate NEW --syn -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT"
408
		$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport $SSH_PORT -m conntrack --ctstate NEW -j ACCEPT
409
	fi
520 richard 410
fi
783 richard 411
 
412
# Insertion de règles locales
413
# Here, we add local rules (i.e. VPN from Internet)
414
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
2454 tom.houday 415
	. /usr/local/etc/alcasar-iptables-local.sh
783 richard 416
fi
417
 
418
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
419
# Deny and log on INPUT from the LAN
2844 rexy 420
$IPTABLES -A INPUT -i $TUNIF -m conntrack --ctstate NEW -j NFLOG --nflog-group 3 --nflog-prefix "RULE rej-int -- REJECT "
783 richard 421
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
422
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
423
 
1393 richard 424
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 425
# Reject INTIF access (only when chilli is down)
2844 rexy 426
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 3 --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 427
$IPTABLES -A INPUT -i $INTIF -j REJECT
428
 
429
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
430
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
2496 tom.houday 431
$IPTABLES -A INPUT -i $EXTIF -m conntrack --ctstate NEW -j NFLOG --nflog-group 3 --nflog-threshold 10 --nflog-prefix "RULE rej-ext -- DROP"
783 richard 432
 
433
#############################
434
#        FORWARD            #
435
#############################
436
 
2841 rexy 437
# Blocage des IPs du SET bl_ip_blocked pour le SET av_bl
438
# Deny IPs of the SET bl_ip_blocked for the set av_bl
439
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set av_bl src -m set --match-set bl_ip_blocked dst -p icmp -j REJECT --reject-with icmp-host-prohibited
440
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set av_bl src -m set --match-set bl_ip_blocked dst -p udp -j REJECT --reject-with icmp-host-prohibited
441
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set av_bl src -m set --match-set bl_ip_blocked dst -p tcp -j REJECT --reject-with tcp-reset
1364 richard 442
 
2184 richard 443
# Active le suivi de session
444
# Allow Conntrack
2496 tom.houday 445
$IPTABLES -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
790 richard 446
 
2668 rexy 447
# Compute uamallowed IP (ie : IP address of equipments connected between ALCASAR and router like DMZ, own servers, etc.)
2006 raphael.pi 448
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
449
if [ $nb_uamallowed != "0" ]
450
then
2454 tom.houday 451
	while read ip_allowed_line
1488 richard 452
	do
2006 raphael.pi 453
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
2496 tom.houday 454
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j NETFLOW
455
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j ACCEPT
2006 raphael.pi 456
	done < /usr/local/etc/alcasar-uamallowed
457
fi
492 franck 458
 
2184 richard 459
# filtrage protocole par utilisateur (profile 1 : http, https)
460
# protocols filtering for users (profil 1 : http, https)
2496 tom.houday 461
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports http,https -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset
462
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_1 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports http,https -m conntrack --ctstate NEW -j REJECT --reject-with icmp-port-unreachable
2006 raphael.pi 463
 
2998 rexy 464
# filtrage protocole par utilisateur (profile 2 : http https smtp pop3 pop3s imap imaps ftp sftp ssh)
465
# protocols filtering for users (profil 2 : http https smtp pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 466
 
2998 rexy 467
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports smtp,http,https,pop3,pop3s,imap,imaps,ftp,ftp-data,sftp,ssh -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset
468
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports smtp,http,https,pop3,pop3s,imap,imaps,ftp,ftp-data,sftp,ssh -m conntrack --ctstate NEW -j REJECT --reject-with icmp-port-unreachable
2006 raphael.pi 469
 
2184 richard 470
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
471
# protocols filtering for users (profil 3 : customized with ACC)
472
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 473
while read svc_line
474
do
475
	svc_on=`echo $svc_line|cut -b1`
476
	if [ $svc_on != "#" ]
2688 lucas.echa 477
	then
2006 raphael.pi 478
		svc_name=`echo $svc_line|cut -d" " -f1`
479
		svc_port=`echo $svc_line|cut -d" " -f2`
480
		if [ $svc_name = "icmp" ]
481
		then
2184 richard 482
			svc_icmp="on"
2006 raphael.pi 483
		else
2184 richard 484
			if [ "$custom_tcp_protocols_list" == "" ]
485
			then
486
				custom_tcp_protocols_list=$svc_port
487
			else
488
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
489
			fi
490
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
491
			if [ $udp_svc = "1" ] # udp service exist
492
			then
493
				if [ "$custom_udp_protocols_list" == "" ]
494
				then
495
					custom_udp_protocols_list=$svc_port
496
				else
497
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
498
				fi
499
			fi
1488 richard 500
		fi
2006 raphael.pi 501
	fi
502
done < /usr/local/etc/alcasar-services
2184 richard 503
	if [ "$custom_tcp_protocols_list" == "" ]
504
	then
505
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
506
	else
507
		if [ "$svc_icmp" != "on" ]
508
		then
509
			$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p icmp -j REJECT --reject-with icmp-proto-unreachable
510
		fi
2496 tom.houday 511
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports $custom_tcp_protocols_list -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset
512
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports $custom_udp_protocols_list -m conntrack --ctstate NEW -j REJECT --reject-with icmp-port-unreachable
2184 richard 513
	fi
1488 richard 514
 
2841 rexy 515
# Blocage des usagers 'av_wl' cherchant à joindre les IP qui ne sont pas dans la WL
516
# Block 'av_wl' users who want IP not in the WL
517
$IPTABLES -A FORWARD -i $TUNIF -m set --match-set av_wl src -m set ! --match-set wl_ip_allowed dst -j DROP
2674 lucas.echa 518
 
2454 tom.houday 519
# journalisation et autorisation des connections sortant du LAN
476 richard 520
# Allow forward connections with log
2496 tom.houday 521
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j NETFLOW
522
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j ACCEPT
1 root 523
 
783 richard 524
#############################
525
#         OUTPUT            #
526
#############################
2844 rexy 527
# On laisse tout sortir sur la carte interne (voir les règles suivantes pour la carte externe)
528
# We let everything out on INTIF (see following rules for the EXTIF)
2213 richard 529
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 530
 
2468 richard 531
# Si configuré, on autorise les requêtes DHCP
1587 richard 532
# Allow DHCP requests if configured
533
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
534
if [[ "$public_ip_mask" == "dhcp" ]]
535
then
536
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
537
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
538
fi
539
 
2454 tom.houday 540
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 541
# Allow DNS requests to identified DNS servers
2496 tom.houday 542
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m conntrack --ctstate NEW -j ACCEPT
783 richard 543
 
2844 rexy 544
# On autorise les requêtes HTTP et HTTPS avec log Netflow (en provenance de E2guardian)
545
# HTTP & HTTPS requests are allowed with netflow log (from E2guardian)
1159 crox53 546
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 547
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
2956 rexy 548
#$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j NETFLOW # When E2guardian will be in HTTPS transparent proxy)
2259 tom.houday 549
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
550
 
1862 raphael.pi 551
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
2468 richard 552
# RSYNC requests are allowed (update of Toulouse BL)
1862 raphael.pi 553
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
554
 
2454 tom.houday 555
# On autorise les requêtes FTP
784 richard 556
# FTP requests are allowed
1705 richard 557
modprobe nf_conntrack_ftp
2642 rexy 558
$IPTABLES -t raw -A OUTPUT -p tcp --dport ftp -j CT --helper ftp
784 richard 559
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
2496 tom.houday 560
$IPTABLES -A OUTPUT -o $EXTIF -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
784 richard 561
 
2454 tom.houday 562
# On autorise les requêtes NTP
498 richard 563
# NTP requests are allowed
564
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 565
 
2454 tom.houday 566
# On autorise les requêtes ICMP (ping)
503 richard 567
# ICMP (ping) requests are allowed
568
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 569
 
2468 richard 570
# On autorise les requêtes LDAP
571
# LDAP requests are allowed
2496 tom.houday 572
$IPTABLES -A OUTPUT -o $EXTIF -p tcp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
573
$IPTABLES -A OUTPUT -o $EXTIF -p udp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
783 richard 574
 
575
#############################
576
#       POSTROUTING         #
577
#############################
498 richard 578
# Traduction dynamique d'adresse en sortie
476 richard 579
# Dynamic NAT on EXTIF
1 root 580
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
581
 
2956 rexy 582
#Sauvegarde de la marque associée à la connexion pour le load balancing
583
$IPTABLES -A POSTROUTING -t mangle -j CONNMARK --save-mark
584
 
2495 tom.houday 585
#############################
586
#          FAIL2BAN         #
587
#############################
588
# Reload Fail2Ban
2530 lucas.echa 589
if systemctl -q is-active fail2ban; then
2899 rexy 590
	/usr/bin/fail2ban-client ping &>/dev/null && /usr/bin/fail2ban-client -q reload &>/dev/null
2530 lucas.echa 591
fi