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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2956 2021-05-24 19:57:17Z 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}
1469 richard 45
SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
1063 richard 46
SSH_ADMIN_FROM=${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 47
IPTABLES="/sbin/iptables"
2521 armand.ito 48
IP_REHABILITEES="/etc/e2guardian/lists/exceptioniplist"		# Rehabilitated IP
2841 rexy 49
SITE_DIRECT="/usr/local/etc/alcasar-site-direct"			# WEB Sites allowed for all (no av and no filtering for av_bl users)
2956 rexy 50
MULTIWAN=`grep ^MULTIWAN $CONF_FILE|cut -d"=" -f2`
51
PROXY=`grep ^PROXY= $CONF_FILE|cut -d"=" -f2`
52
PROXY_IP=`grep ^PROXY_IP= $CONF_FILE|cut -d"=" -f2`
53
nb_gw=`grep ^WAN $CONF_FILE|wc -l`
1 root 54
 
2688 lucas.echa 55
# Allow requests to internal DNS if activated
56
if [ "$INT_DNS_ACTIVE" = "on" ]
57
then
58
	DNSSERVERS="$DNSSERVERS,$INT_DNS_IP"
59
fi
60
 
2956 rexy 61
#ipset name list for load_balancing
62
gw_list="gw0"
63
if [ "$MULTIWAN" == "on" ] || [ "$MULTIWAN" == "On" ]; then
64
	for ((i=1 ; i<=$nb_gw ; i++)); do
65
		gw_list="${gw_list} gw$i"
66
	done
67
fi
68
 
69
 
1364 richard 70
# Sauvegarde des SET des utilisateurs connectés si ils existent
71
# Saving SET of connected users if it exists
1867 raphael.pi 72
ipset list not_filtered 1>/dev/null 2>&1
1364 richard 73
if [ $? -eq 0 ];
74
then
1867 raphael.pi 75
	ipset save not_filtered > $TMP_users_set_save
2841 rexy 76
	ipset save av >> $TMP_users_set_save
77
	ipset save av_bl >> $TMP_users_set_save
78
	ipset save av_wl >> $TMP_users_set_save
2006 raphael.pi 79
	ipset save proto_0 >> $TMP_users_set_save
80
	ipset save proto_1 >> $TMP_users_set_save
81
	ipset save proto_2 >> $TMP_users_set_save
82
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 83
fi
84
 
2956 rexy 85
# Sauvegarde de la liste de toutes les IP déjà connectées pour les réintégrer dans le load balancing
86
# Saving all of the already connected IP in order to put them back in the load balancing after
87
if [ ! -f $TMP_ip_gw_save ];then
88
	# Save only if alcasar-network.sh --save has not been executed before
89
	for i in $gw_list;do
90
		ipset list $i 1>/dev/null 2>&1
91
		if [ $? -eq 0 ]
92
		then
93
			# the cut -d":" -f5 deletes all the lines with a :, i.e all the lines execpt the members
94
			ipset list $i | cut -d":" -f5 | sed '/^[[:space:]]*$/d' >> $TMP_ip_gw_save
95
		fi
96
	done
97
fi
98
 
2668 rexy 99
# Chargement de la sonde NetFlow (module noyau ipt_NETFLOW)
1291 richard 100
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 101
modprobe ipt_NETFLOW destination=127.0.0.1:2055
102
 
498 richard 103
# Effacement des règles existantes
476 richard 104
# Flush all existing rules
1 root 105
$IPTABLES -F
106
$IPTABLES -t nat -F
107
$IPTABLES -t mangle -F
108
$IPTABLES -F INPUT
109
$IPTABLES -F FORWARD
110
$IPTABLES -F OUTPUT
111
 
498 richard 112
# Suppression des chaines utilisateurs sur les tables filter et nat
113
# Flush non default rules on filter and nat tables
114
$IPTABLES -X
115
$IPTABLES -t nat -X
116
 
117
# Stratégies par défaut
476 richard 118
# Default policies
1 root 119
$IPTABLES -P INPUT DROP
120
$IPTABLES -P FORWARD DROP
498 richard 121
$IPTABLES -P OUTPUT DROP
1 root 122
$IPTABLES -t nat -P PREROUTING ACCEPT
123
$IPTABLES -t nat -P POSTROUTING ACCEPT
124
$IPTABLES -t nat -P OUTPUT ACCEPT
125
 
1484 richard 126
 
127
#############################
128
#          IPSET            #
129
#############################
130
 
1291 richard 131
# destruction de tous les SET
1332 richard 132
# destroy all SET
1876 raphael.pi 133
ipset flush
1291 richard 134
ipset destroy
1855 raphael.pi 135
 
1484 richard 136
###### BL set  ###########
137
# Calcul de la taille / Compute the length
1932 richard 138
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 139
# Chargement / loading
1867 raphael.pi 140
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 141
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 142
do
1364 richard 143
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 144
done
1364 richard 145
ipset -! restore < $TMP_set_save
146
rm -f $TMP_set_save
1484 richard 147
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 148
for ip in $(cat $IP_REHABILITEES)
149
do
2688 lucas.echa 150
	ipset -q del bl_ip_blocked $ip
1339 richard 151
done
152
 
2841 rexy 153
# ipset for exception web sites (usefull for filtered users = av_bl)
2485 franck 154
ipset create site_direct hash:net hashsize 1024
155
for site in $(cat $SITE_DIRECT)
156
do
2688 lucas.echa 157
    ipset add site_direct $site
2485 franck 158
done
159
 
1484 richard 160
###### WL set  ###########
2688 lucas.echa 161
# taille fixe, car peuplé par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 162
wl_set_length=65536
1484 richard 163
# Chargement Loading
1867 raphael.pi 164
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 165
#get ip-wl files from ACC
1932 richard 166
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 167
do
1932 richard 168
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 169
done
1364 richard 170
ipset -! restore < $TMP_set_save
171
rm -f $TMP_set_save
172
 
2454 tom.houday 173
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 174
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 175
if [ -e $TMP_users_set_save ];
176
then
177
	ipset -! restore < $TMP_users_set_save
178
	rm -f $TMP_users_set_save
179
else
2386 tom.houday 180
	ipset create not_filtered hash:ip hashsize 1024
2841 rexy 181
	ipset create av hash:ip hashsize 1024
182
	ipset create av_bl hash:ip hashsize 1024
183
	ipset create av_wl hash:ip hashsize 1024
2668 rexy 184
	# pour les filtrages de protocole par utilisateur / For network protocols filtering by user
2386 tom.houday 185
	ipset create proto_0 hash:ip hashsize 1024
186
	ipset create proto_1 hash:ip hashsize 1024
187
	ipset create proto_2 hash:ip hashsize 1024
188
	ipset create proto_3 hash:ip hashsize 1024
1364 richard 189
fi
190
 
2956 rexy 191
#ipsets for load balancing
192
for i in $gw_list; do
193
	ipset create $i hash:ip
194
done
195
cat $TMP_ip_gw_save | while read ip; do
196
	gw_min="gw0"
197
	weight=`grep ^PUBLIC_WEIGHT= $CONF_FILE | cut -d"=" -f2`
198
	already=`ipset list $gw_min | grep Number\ of\ entries: | cut -d":" -f2`
199
	#The *1000 is here to avoid working on floats in bash
200
	gw_min_value=$((1000 * $already / $weight))
201
	i=1
202
	for gw in $gw_list;do
203
		if [ "$gw" != "gw0" ]; then
204
			weight=`grep ^WAN$i= $CONF_FILE | awk -F'"' '{ print $2 }' | awk -F ',' '{ print $2 }'`
205
			already=`ipset list $gw | grep Number\ of\ entries: | cut -d":" -f2`
206
			value=$((1000 * $already / $weight))
207
			if [ $value -lt $gw_min_value ]
208
			then
209
				gw_min_value=$value
210
				gw_min=$gw
211
			fi
212
			i=$(($i+1))
213
		fi
214
	done
215
	ipset add $gw_min $ip
216
done
217
rm -f $TMP_ip_gw_save
218
 
219
 
220
 
472 richard 221
#############################
783 richard 222
#       PREROUTING          #
472 richard 223
#############################
1827 raphael.pi 224
 
2956 rexy 225
 
2840 rexy 226
# 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
227
# Mark (and log) the direct attempts to E2guardian listen ports in order to REJECT them in INPUT rules
2841 rexy 228
# 8080 = ipset av_bl
2355 tom.houday 229
$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 230
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
2841 rexy 231
# 8090 = ipset av_wl + av
2355 tom.houday 232
$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 233
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
2844 rexy 234
# 8443 = tranparent HTTPS for ipsets av_bl + av_wl + av (future version)
235
#$IPTABLES -A PREROUTING -t nat -i $TUNIF -p tcp -d $PRIVATE_IP -m tcp --dport 8443 -j NFLOG --nflog-group 1 --nflog-prefix "RULE direct-proxy -- DENY "
236
#$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8443 -j MARK --set-mark 6
1486 richard 237
 
2840 rexy 238
# Marquage des paquets qui tentent d'accéder directement aux ports d'écoute DNS (UNBOUND) pour pouvoir les rejeter en INPUT
239
# Mark the direct attempts to DNS ports (UNBOUND) in order to REJECT them in INPUT rules
2841 rexy 240
# 54 = ipset av_bl
1486 richard 241
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 242
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
2841 rexy 243
# 55 = ipset av_wl
1486 richard 244
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 245
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
2840 rexy 246
# 56 = blackall
1486 richard 247
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 248
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 249
 
2840 rexy 250
# redirection DNS des usagers
251
# users DNS redirection
2841 rexy 252
# 54 = ipset av_bl
253
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -p udp --dport domain -j REDIRECT --to-port 54
254
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -p tcp --dport domain -j REDIRECT --to-port 54
255
# 55 = ipset av_wl
256
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -p udp --dport domain -j REDIRECT --to-port 55
257
$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 258
# 53 = all other users
2517 rexy 259
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 53
260
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p tcp --dport domain -j REDIRECT --to-port 53
261
 
2844 rexy 262
# Redirection HTTP des usagers 'av_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
263
# Redirect HTTP of 'av_bl' users who want blacklist IP to ALCASAR ('access denied' page)
264
$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
265
 
266
# Redirection HTTP des usagers 'av_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
267
# Redirect HTTP of 'av_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
268
$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
269
 
270
# Journalisation des usagers "av_bl + av_wl + av" (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
271
# accounting of "av_bl + av_wl + av"  users (only syn packets). Other protocols are logged in FORWARD by netflow
272
$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 "
273
$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 "
274
$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 "
275
 
276
# Redirection des requêtes HTTP des usagers "av_bl + av_wl + av" vers E2guardian
277
# Redirect outbound "av_bl + av_wl +av" users HTTP requests to E2guardian
2841 rexy 278
# 8080 = ipset av_bl
2956 rexy 279
#$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 280
$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
281
# 8090 = ipset av_wl & av
282
$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
283
$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 284
 
2844 rexy 285
# 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 286
# Redirect outbound HTTPS requests of av_bl + av_wl + av users to E2Guardian
2844 rexy 287
#$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport https -j REDIRECT --to-port 8443
288
#$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -m set ! --match-set site_direct dst ! -d $PRIVATE_IP  -p tcp --dport https -j REDIRECT --to-port 8443
289
#$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 290
 
783 richard 291
# Redirection des requêtes NTP vers le serveur NTP local
292
# Redirect NTP request in local NTP server
293
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
294
 
2956 rexy 295
#Récupération de la marque associée à une gw pour chaque connection
296
$IPTABLES -A PREROUTING -t mangle -j CONNMARK --restore-mark
297
 
298
if [ "$PROXY" == "on" ] || [ "$PROXY" == "On" ];then
299
	$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p tcp -m multiport --dports http,https -j DNAT --to-destination $PROXY_IP
300
fi
301
 
302
#Marquage pour le load balancing
303
if [ "$MULTIWAN" == "on" ] || [ "$MULTIWAN" == "On" ]; then
304
	temp_index=200
305
	for i in $gw_list; do
306
		$IPTABLES -A PREROUTING -t mangle -i $TUNIF -m set --match-set $i src -j MARK --set-mark $temp_index
307
		temp_index=$(($temp_index+1))
308
	done
309
fi
310
 
311
 
472 richard 312
#############################
783 richard 313
#         INPUT             #
472 richard 314
#############################
871 richard 315
 
783 richard 316
# Tout passe sur loopback
317
# accept all on loopback
318
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 319
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 320
 
321
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
2956 rexy 322
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST and NEW not SYN)
472 richard 323
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
324
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
325
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
326
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
2496 tom.houday 327
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m conntrack --ctstate NEW -j DROP
498 richard 328
 
2454 tom.houday 329
# Si configéré, on autorise les réponses DHCP
1587 richard 330
# Allow DHCP answers if configured
331
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
332
if [[ "$public_ip_mask" == "dhcp" ]]
333
then
334
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
335
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
336
fi
871 richard 337
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
2454 tom.houday 338
# Drop broadcast & multicast on EXTIF to avoid log
1629 richard 339
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 340
 
783 richard 341
# On autorise les retours de connexions légitimes par INPUT
342
# Conntrack on INPUT
2496 tom.houday 343
$IPTABLES -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
373 richard 344
 
2840 rexy 345
# On interdit les connexions directes aux ports d'écoute d'E2Guardian. Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
346
# Deny direct connections on E2Guardian listen ports. The concerned paquets have been marked and logged in mangle table (PREROUTING)
2841 rexy 347
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset # av_bl
348
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset # av_wl + av
2844 rexy 349
#$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 350
 
2840 rexy 351
# On autorise les connexions HTTP/HTTPS légitimes vers E2Guardian
352
# Allow HTTP connections to E2Guardian
2496 tom.houday 353
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m conntrack --ctstate NEW --syn -j ACCEPT
354
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m conntrack --ctstate NEW --syn -j ACCEPT
2844 rexy 355
#$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8443 -m conntrack --ctstate NEW --syn -j ACCEPT # (future version)
1486 richard 356
 
2840 rexy 357
# On interdit les connexions directes aux ports d'écoupe DNS (UNBOUND). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
358
# Deny direct connections to DNS ports (UNBOUND). The concerned paquets are marked in mangle table (PREROUTING)
1962 richard 359
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
360
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
361
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
2840 rexy 362
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with tcp-reset
1962 richard 363
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
2840 rexy 364
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with tcp-reset
1472 richard 365
 
2840 rexy 366
# On autorise les connexion DNS légitime
367
# Allow DNS connections
2841 rexy 368
# ipset = av_bl
783 richard 369
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 370
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
2841 rexy 371
# ipset = av_wl
1364 richard 372
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 373
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
2840 rexy 374
# blackall
1472 richard 375
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 376
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 377
 
2840 rexy 378
# On accepte l'accès aux services internes
783 richard 379
# Internal services access
2454 tom.houday 380
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
1962 richard 381
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 382
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
383
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
384
$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
385
$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 386
$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 387
$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 388
 
2668 rexy 389
# Accès au serveur SSHD si activé
390
# SSHD server access if enabled
783 richard 391
if [ $SSH = on ]
520 richard 392
	then
2496 tom.houday 393
	$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"
783 richard 394
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
2496 tom.houday 395
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m conntrack --ctstate NEW --syn -j NFLOG --nflog-group 2 --nflog-prefix "RULE ssh-from-WAN -- ACCEPT"
396
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m conntrack --ctstate NEW -j ACCEPT
520 richard 397
fi
783 richard 398
 
399
# Insertion de règles locales
400
# Here, we add local rules (i.e. VPN from Internet)
401
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
2454 tom.houday 402
	. /usr/local/etc/alcasar-iptables-local.sh
783 richard 403
fi
404
 
405
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
406
# Deny and log on INPUT from the LAN
2844 rexy 407
$IPTABLES -A INPUT -i $TUNIF -m conntrack --ctstate NEW -j NFLOG --nflog-group 3 --nflog-prefix "RULE rej-int -- REJECT "
783 richard 408
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
409
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
410
 
1393 richard 411
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 412
# Reject INTIF access (only when chilli is down)
2844 rexy 413
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 3 --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 414
$IPTABLES -A INPUT -i $INTIF -j REJECT
415
 
416
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
417
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
2496 tom.houday 418
$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 419
 
420
#############################
421
#        FORWARD            #
422
#############################
423
 
2841 rexy 424
# Blocage des IPs du SET bl_ip_blocked pour le SET av_bl
425
# Deny IPs of the SET bl_ip_blocked for the set av_bl
426
$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
427
$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
428
$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 429
 
2184 richard 430
# Active le suivi de session
431
# Allow Conntrack
2496 tom.houday 432
$IPTABLES -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
790 richard 433
 
2668 rexy 434
# Compute uamallowed IP (ie : IP address of equipments connected between ALCASAR and router like DMZ, own servers, etc.)
2006 raphael.pi 435
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
436
if [ $nb_uamallowed != "0" ]
437
then
2454 tom.houday 438
	while read ip_allowed_line
1488 richard 439
	do
2006 raphael.pi 440
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
2496 tom.houday 441
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j NETFLOW
442
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j ACCEPT
2006 raphael.pi 443
	done < /usr/local/etc/alcasar-uamallowed
444
fi
492 franck 445
 
2184 richard 446
# filtrage protocole par utilisateur (profile 1 : http, https)
447
# protocols filtering for users (profil 1 : http, https)
2496 tom.houday 448
	$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
449
	$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 450
 
2184 richard 451
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
452
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 453
 
2496 tom.houday 454
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p tcp -m multiport ! --dports http,https,pop3,pop3s,imap,imaps,ftp,ftp-data,sftp,ssh -m conntrack --ctstate NEW -j REJECT --reject-with tcp-reset
455
	$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_2 src -s $PRIVATE_NETWORK_MASK -p udp -m multiport ! --dports http,https,pop3,pop3s,imap,imaps,ssh -m conntrack --ctstate NEW -j REJECT --reject-with icmp-port-unreachable
2006 raphael.pi 456
 
2184 richard 457
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
458
# protocols filtering for users (profil 3 : customized with ACC)
459
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 460
while read svc_line
461
do
462
	svc_on=`echo $svc_line|cut -b1`
463
	if [ $svc_on != "#" ]
2688 lucas.echa 464
	then
2006 raphael.pi 465
		svc_name=`echo $svc_line|cut -d" " -f1`
466
		svc_port=`echo $svc_line|cut -d" " -f2`
467
		if [ $svc_name = "icmp" ]
468
		then
2184 richard 469
			svc_icmp="on"
2006 raphael.pi 470
		else
2184 richard 471
			if [ "$custom_tcp_protocols_list" == "" ]
472
			then
473
				custom_tcp_protocols_list=$svc_port
474
			else
475
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
476
			fi
477
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
478
			if [ $udp_svc = "1" ] # udp service exist
479
			then
480
				if [ "$custom_udp_protocols_list" == "" ]
481
				then
482
					custom_udp_protocols_list=$svc_port
483
				else
484
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
485
				fi
486
			fi
1488 richard 487
		fi
2006 raphael.pi 488
	fi
489
done < /usr/local/etc/alcasar-services
2184 richard 490
	if [ "$custom_tcp_protocols_list" == "" ]
491
	then
492
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
493
	else
494
		if [ "$svc_icmp" != "on" ]
495
		then
496
			$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
497
		fi
2496 tom.houday 498
		$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
499
		$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 500
	fi
1488 richard 501
 
2841 rexy 502
# Blocage des usagers 'av_wl' cherchant à joindre les IP qui ne sont pas dans la WL
503
# Block 'av_wl' users who want IP not in the WL
504
$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 505
 
2454 tom.houday 506
# journalisation et autorisation des connections sortant du LAN
476 richard 507
# Allow forward connections with log
2496 tom.houday 508
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j NETFLOW
509
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j ACCEPT
1 root 510
 
783 richard 511
#############################
512
#         OUTPUT            #
513
#############################
2844 rexy 514
# On laisse tout sortir sur la carte interne (voir les règles suivantes pour la carte externe)
515
# We let everything out on INTIF (see following rules for the EXTIF)
2213 richard 516
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 517
 
2468 richard 518
# Si configuré, on autorise les requêtes DHCP
1587 richard 519
# Allow DHCP requests if configured
520
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
521
if [[ "$public_ip_mask" == "dhcp" ]]
522
then
523
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
524
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
525
fi
526
 
2454 tom.houday 527
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 528
# Allow DNS requests to identified DNS servers
2496 tom.houday 529
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m conntrack --ctstate NEW -j ACCEPT
783 richard 530
 
2844 rexy 531
# On autorise les requêtes HTTP et HTTPS avec log Netflow (en provenance de E2guardian)
532
# HTTP & HTTPS requests are allowed with netflow log (from E2guardian)
1159 crox53 533
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 534
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
2956 rexy 535
#$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j NETFLOW # When E2guardian will be in HTTPS transparent proxy)
2259 tom.houday 536
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
537
 
1862 raphael.pi 538
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
2468 richard 539
# RSYNC requests are allowed (update of Toulouse BL)
1862 raphael.pi 540
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
541
 
2454 tom.houday 542
# On autorise les requêtes FTP
784 richard 543
# FTP requests are allowed
1705 richard 544
modprobe nf_conntrack_ftp
2642 rexy 545
$IPTABLES -t raw -A OUTPUT -p tcp --dport ftp -j CT --helper ftp
784 richard 546
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
2496 tom.houday 547
$IPTABLES -A OUTPUT -o $EXTIF -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
784 richard 548
 
2454 tom.houday 549
# On autorise les requêtes NTP
498 richard 550
# NTP requests are allowed
551
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 552
 
2454 tom.houday 553
# On autorise les requêtes ICMP (ping)
503 richard 554
# ICMP (ping) requests are allowed
555
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 556
 
2468 richard 557
# On autorise les requêtes LDAP
558
# LDAP requests are allowed
2496 tom.houday 559
$IPTABLES -A OUTPUT -o $EXTIF -p tcp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
560
$IPTABLES -A OUTPUT -o $EXTIF -p udp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
783 richard 561
 
562
#############################
563
#       POSTROUTING         #
564
#############################
498 richard 565
# Traduction dynamique d'adresse en sortie
476 richard 566
# Dynamic NAT on EXTIF
1 root 567
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
568
 
2956 rexy 569
#Sauvegarde de la marque associée à la connexion pour le load balancing
570
$IPTABLES -A POSTROUTING -t mangle -j CONNMARK --save-mark
571
 
2495 tom.houday 572
#############################
573
#          FAIL2BAN         #
574
#############################
575
# Reload Fail2Ban
2530 lucas.echa 576
if systemctl -q is-active fail2ban; then
2899 rexy 577
	/usr/bin/fail2ban-client ping &>/dev/null && /usr/bin/fail2ban-client -q reload &>/dev/null
2530 lucas.echa 578
fi