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872 richard 1
#!/bin/bash
64 franck 2
# $Id: alcasar-iptables.sh 2841 2020-06-28 21:49:00Z 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
1469 richard 42
SSH=`grep ^SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
615 richard 43
SSH=${SSH:=off}
1469 richard 44
SSH_ADMIN_FROM=`grep ^SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
1063 richard 45
SSH_ADMIN_FROM=${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 46
IPTABLES="/sbin/iptables"
2521 armand.ito 47
IP_REHABILITEES="/etc/e2guardian/lists/exceptioniplist"		# Rehabilitated IP
2841 rexy 48
SITE_DIRECT="/usr/local/etc/alcasar-site-direct"			# WEB Sites allowed for all (no av and no filtering for av_bl users)
1 root 49
 
2688 lucas.echa 50
# Allow requests to internal DNS if activated
51
if [ "$INT_DNS_ACTIVE" = "on" ]
52
then
53
	DNSSERVERS="$DNSSERVERS,$INT_DNS_IP"
54
fi
55
 
1364 richard 56
# Sauvegarde des SET des utilisateurs connectés si ils existent
57
# Saving SET of connected users if it exists
1867 raphael.pi 58
ipset list not_filtered 1>/dev/null 2>&1
1364 richard 59
if [ $? -eq 0 ];
60
then
1867 raphael.pi 61
	ipset save not_filtered > $TMP_users_set_save
2841 rexy 62
	ipset save av >> $TMP_users_set_save
63
	ipset save av_bl >> $TMP_users_set_save
64
	ipset save av_wl >> $TMP_users_set_save
2006 raphael.pi 65
	ipset save proto_0 >> $TMP_users_set_save
66
	ipset save proto_1 >> $TMP_users_set_save
67
	ipset save proto_2 >> $TMP_users_set_save
68
	ipset save proto_3 >> $TMP_users_set_save
1364 richard 69
fi
70
 
2668 rexy 71
# Chargement de la sonde NetFlow (module noyau ipt_NETFLOW)
1291 richard 72
# loading of NetFlow probe (ipt_NETFLOW kernel module)
1159 crox53 73
modprobe ipt_NETFLOW destination=127.0.0.1:2055
74
 
498 richard 75
# Effacement des règles existantes
476 richard 76
# Flush all existing rules
1 root 77
$IPTABLES -F
78
$IPTABLES -t nat -F
79
$IPTABLES -t mangle -F
80
$IPTABLES -F INPUT
81
$IPTABLES -F FORWARD
82
$IPTABLES -F OUTPUT
83
 
498 richard 84
# Suppression des chaines utilisateurs sur les tables filter et nat
85
# Flush non default rules on filter and nat tables
86
$IPTABLES -X
87
$IPTABLES -t nat -X
88
 
89
# Stratégies par défaut
476 richard 90
# Default policies
1 root 91
$IPTABLES -P INPUT DROP
92
$IPTABLES -P FORWARD DROP
498 richard 93
$IPTABLES -P OUTPUT DROP
1 root 94
$IPTABLES -t nat -P PREROUTING ACCEPT
95
$IPTABLES -t nat -P POSTROUTING ACCEPT
96
$IPTABLES -t nat -P OUTPUT ACCEPT
97
 
1484 richard 98
 
99
#############################
100
#          IPSET            #
101
#############################
102
 
1291 richard 103
# destruction de tous les SET
1332 richard 104
# destroy all SET
1876 raphael.pi 105
ipset flush
1291 richard 106
ipset destroy
1855 raphael.pi 107
 
1484 richard 108
###### BL set  ###########
109
# Calcul de la taille / Compute the length
1932 richard 110
bl_set_length=$(wc -l $BL_IP_CAT/* | awk '{print $1}' | tail -n 1)
1484 richard 111
# Chargement / loading
1867 raphael.pi 112
echo "create bl_ip_blocked hash:net family inet hashsize 1024 maxelem $bl_set_length" > $TMP_set_save
1393 richard 113
for category in `ls -1 $BL_IP_CAT | cut -d '@' -f1`
1332 richard 114
do
1364 richard 115
	cat $BL_IP_CAT/$category >> $TMP_set_save
1332 richard 116
done
1364 richard 117
ipset -! restore < $TMP_set_save
118
rm -f $TMP_set_save
1484 richard 119
# Suppression des ip réhabilitées / Removing of rehabilitated ip
1339 richard 120
for ip in $(cat $IP_REHABILITEES)
121
do
2688 lucas.echa 122
	ipset -q del bl_ip_blocked $ip
1339 richard 123
done
124
 
2841 rexy 125
# ipset for exception web sites (usefull for filtered users = av_bl)
2485 franck 126
ipset create site_direct hash:net hashsize 1024
127
for site in $(cat $SITE_DIRECT)
128
do
2688 lucas.echa 129
    ipset add site_direct $site
2485 franck 130
done
131
 
1484 richard 132
###### WL set  ###########
2688 lucas.echa 133
# taille fixe, car peuplé par dnsmasq / fixe length due to dnsmasq dynamic loading
1896 raphael.pi 134
wl_set_length=65536
1484 richard 135
# Chargement Loading
1867 raphael.pi 136
echo "create wl_ip_allowed hash:net family inet hashsize 1024 maxelem $wl_set_length" > $TMP_set_save
1852 raphael.pi 137
#get ip-wl files from ACC
1932 richard 138
for category in `ls -1 $WL_IP_CAT |cut -d '@' -f1`
1852 raphael.pi 139
do
1932 richard 140
	cat $WL_IP_CAT/$category >> $TMP_set_save
1852 raphael.pi 141
done
1364 richard 142
ipset -! restore < $TMP_set_save
143
rm -f $TMP_set_save
144
 
2454 tom.houday 145
# Restoration des SET des utilisateurs connectés si ils existent sinon création des SET
1377 richard 146
# Restoring the connected users SETs if available, otherwise creating SETs
1364 richard 147
if [ -e $TMP_users_set_save ];
148
then
149
	ipset -! restore < $TMP_users_set_save
150
	rm -f $TMP_users_set_save
151
else
2386 tom.houday 152
	ipset create not_filtered hash:ip hashsize 1024
2841 rexy 153
	ipset create av hash:ip hashsize 1024
154
	ipset create av_bl hash:ip hashsize 1024
155
	ipset create av_wl hash:ip hashsize 1024
2668 rexy 156
	# pour les filtrages de protocole par utilisateur / For network protocols filtering by user
2386 tom.houday 157
	ipset create proto_0 hash:ip hashsize 1024
158
	ipset create proto_1 hash:ip hashsize 1024
159
	ipset create proto_2 hash:ip hashsize 1024
160
	ipset create proto_3 hash:ip hashsize 1024
1364 richard 161
fi
162
 
472 richard 163
#############################
783 richard 164
#       PREROUTING          #
472 richard 165
#############################
1827 raphael.pi 166
 
2840 rexy 167
# 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
168
# Mark (and log) the direct attempts to E2guardian listen ports in order to REJECT them in INPUT rules
2841 rexy 169
# 8080 = ipset av_bl
2355 tom.houday 170
$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 171
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8080 -j MARK --set-mark 1
2841 rexy 172
# 8090 = ipset av_wl + av
2355 tom.houday 173
$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 174
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8090 -j MARK --set-mark 2
2841 rexy 175
# 8443 = tranparent HTTPS for ipsets av_bl + av_wl + av
2840 rexy 176
$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 "
177
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp -m tcp --dport 8443 -j MARK --set-mark 6
1486 richard 178
 
2840 rexy 179
# Marquage des paquets qui tentent d'accéder directement aux ports d'écoute DNS (UNBOUND) pour pouvoir les rejeter en INPUT
180
# Mark the direct attempts to DNS ports (UNBOUND) in order to REJECT them in INPUT rules
2841 rexy 181
# 54 = ipset av_bl
1486 richard 182
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 54 -j MARK --set-mark 3
1962 richard 183
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 54 -j MARK --set-mark 3
2841 rexy 184
# 55 = ipset av_wl
1486 richard 185
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 55 -j MARK --set-mark 4
1962 richard 186
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 55 -j MARK --set-mark 4
2840 rexy 187
# 56 = blackall
1486 richard 188
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p tcp --dport 56 -j MARK --set-mark 5
1962 richard 189
$IPTABLES -A PREROUTING -t mangle -i $TUNIF -d $PRIVATE_IP -p udp --dport 56 -j MARK --set-mark 5
1472 richard 190
 
2840 rexy 191
# redirection DNS des usagers
192
# users DNS redirection
2841 rexy 193
# 54 = ipset av_bl
194
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -p udp --dport domain -j REDIRECT --to-port 54
195
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_bl src -p tcp --dport domain -j REDIRECT --to-port 54
196
# 55 = ipset av_wl
197
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -p udp --dport domain -j REDIRECT --to-port 55
198
$IPTABLES -A PREROUTING -t nat -i $TUNIF -m set --match-set av_wl src -p tcp --dport domain -j REDIRECT --to-port 55
2840 rexy 199
# 53 = all other users 
2517 rexy 200
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p udp --dport domain -j REDIRECT --to-port 53
201
$IPTABLES -A PREROUTING -t nat -i $TUNIF ! -d $PRIVATE_IP -p tcp --dport domain -j REDIRECT --to-port 53
202
 
2840 rexy 203
# Redirection des requêtes HTTP des usagers vers E2guardian
204
# Redirect outbound users HTTP requests to E2guardian
2841 rexy 205
# 8080 = ipset av_bl
206
$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
207
# 8090 = ipset av_wl & av
208
$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
209
$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 210
 
2841 rexy 211
# Redirection des requêtes HTTPS sortantes des usagers av_bl + av_wl + av vers E2Guardian
212
# Redirect outbound HTTPS requests of av_bl + av_wl + av users to E2Guardian
213
$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
214
$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
215
$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 216
 
2841 rexy 217
# Journalisation HTTP_Internet des usagers 'av_bl' (paquets SYN uniquement). Les autres protocoles sont journalisés en FORWARD par netflow.
218
# Log Internet HTTP of 'av_bl' users" (only syn packets). Other protocols are logged in FORWARD by netflow
219
$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 "
1544 richard 220
 
2841 rexy 221
# Redirection HTTP des usagers 'av_bl' cherchant à joindre les IP de la blacklist vers ALCASAR (page 'accès interdit')
222
# Redirect HTTP of 'av_bl' users who want blacklist IP to ALCASAR ('access denied' page)
223
$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
1364 richard 224
 
2841 rexy 225
# Redirection HTTP des usagers 'av_wl' cherchant à joindre les IP qui ne sont pas dans la WL vers ALCASAR (page 'accès interdit')
226
# Redirect HTTP of 'av_wl' users who want IP not in the WL to ALCASAR ('access denied' page)
227
$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
1393 richard 228
 
783 richard 229
# Redirection des requêtes NTP vers le serveur NTP local
230
# Redirect NTP request in local NTP server
231
$IPTABLES -A PREROUTING -t nat -i $TUNIF -s $PRIVATE_NETWORK_MASK ! -d $PRIVATE_IP -p udp --dport ntp -j REDIRECT --to-port 123
232
 
472 richard 233
#############################
783 richard 234
#         INPUT             #
472 richard 235
#############################
871 richard 236
 
783 richard 237
# Tout passe sur loopback
238
# accept all on loopback
239
$IPTABLES -A INPUT -i lo -j ACCEPT
990 franck 240
$IPTABLES -A OUTPUT -o lo -j ACCEPT
783 richard 241
 
242
# Rejet des demandes de connexions non conformes (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
243
# Drop non standard connexions (FIN-URG-PUSH, XMAS, NullScan, SYN-RST et NEW not SYN)
472 richard 244
$IPTABLES -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
245
$IPTABLES -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
246
$IPTABLES -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
247
$IPTABLES -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
2496 tom.houday 248
$IPTABLES -A INPUT -p tcp -m tcp ! --syn -m conntrack --ctstate NEW -j DROP
498 richard 249
 
2454 tom.houday 250
# Si configéré, on autorise les réponses DHCP
1587 richard 251
# Allow DHCP answers if configured
252
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
253
if [[ "$public_ip_mask" == "dhcp" ]]
254
then
255
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 68 -j ACCEPT
256
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 68 -j ACCEPT
257
fi
871 richard 258
# On rejette les trame en broadcast et en multicast sur EXTIF (évite leur journalisation)
2454 tom.houday 259
# Drop broadcast & multicast on EXTIF to avoid log
1629 richard 260
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
498 richard 261
 
783 richard 262
# On autorise les retours de connexions légitimes par INPUT
263
# Conntrack on INPUT
2496 tom.houday 264
$IPTABLES -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
373 richard 265
 
2840 rexy 266
# On interdit les connexions directes aux ports d'écoute d'E2Guardian. Les packets concernés ont été marqués et loggués dans la table mangle (PREROUTING)
267
# Deny direct connections on E2Guardian listen ports. The concerned paquets have been marked and logged in mangle table (PREROUTING)
2841 rexy 268
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8080 -m mark --mark 1 -j REJECT --reject-with tcp-reset # av_bl
269
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8090 -m mark --mark 2 -j REJECT --reject-with tcp-reset # av_wl + av
270
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 8443 -m mark --mark 6 -j REJECT --reject-with tcp-reset # av_bl + av_wl + av
791 richard 271
 
2840 rexy 272
# On autorise les connexions HTTP/HTTPS légitimes vers E2Guardian
273
# Allow HTTP connections to E2Guardian
2496 tom.houday 274
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8080 -m conntrack --ctstate NEW --syn -j ACCEPT
275
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8090 -m conntrack --ctstate NEW --syn -j ACCEPT
2840 rexy 276
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 8443 -m conntrack --ctstate NEW --syn -j ACCEPT
1486 richard 277
 
2840 rexy 278
# On interdit les connexions directes aux ports d'écoupe DNS (UNBOUND). Les packets concernés ont été marqués dans la table mangle (PREROUTING)
279
# Deny direct connections to DNS ports (UNBOUND). The concerned paquets are marked in mangle table (PREROUTING)
1962 richard 280
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 54 -m mark --mark 3 -j REJECT --reject-with icmp-port-unreachable
281
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 54 -m mark --mark 3 -j REJECT --reject-with tcp-reset
282
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 55 -m mark --mark 4 -j REJECT --reject-with icmp-port-unreachable
2840 rexy 283
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 55 -m mark --mark 4 -j REJECT --reject-with tcp-reset
1962 richard 284
$IPTABLES -A INPUT -i $TUNIF -p udp --dport 56 -m mark --mark 5 -j REJECT --reject-with icmp-port-unreachable
2840 rexy 285
$IPTABLES -A INPUT -i $TUNIF -p tcp --dport 56 -m mark --mark 5 -j REJECT --reject-with tcp-reset
1472 richard 286
 
2840 rexy 287
# On autorise les connexion DNS légitime
288
# Allow DNS connections
2841 rexy 289
# ipset = av_bl
783 richard 290
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 54 -j ACCEPT
1962 richard 291
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 54 -j ACCEPT
2841 rexy 292
# ipset = av_wl
1364 richard 293
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 55 -j ACCEPT
1962 richard 294
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 55 -j ACCEPT
2840 rexy 295
# blackall
1472 richard 296
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport 56 -j ACCEPT
1962 richard 297
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport 56 -j ACCEPT
1472 richard 298
 
2840 rexy 299
# On accepte l'accès aux services internes
783 richard 300
# Internal services access
2454 tom.houday 301
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p udp --dport domain -j ACCEPT	# DNS
1962 richard 302
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport domain -j ACCEPT	# DNS
786 richard 303
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 8 -j ACCEPT	# Réponse ping # ping responce
304
$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p icmp --icmp-type 0 -j ACCEPT	# Requête  ping # ping request
305
$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
306
$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 307
$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 308
$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 309
 
2668 rexy 310
# Accès au serveur SSHD si activé
311
# SSHD server access if enabled
783 richard 312
if [ $SSH = on ]
520 richard 313
	then
2496 tom.houday 314
	$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 315
	$IPTABLES -A INPUT -i $TUNIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -j ACCEPT
2496 tom.houday 316
	$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"
317
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m conntrack --ctstate NEW -j ACCEPT
520 richard 318
fi
783 richard 319
 
320
# Insertion de règles locales
321
# Here, we add local rules (i.e. VPN from Internet)
322
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
2454 tom.houday 323
	. /usr/local/etc/alcasar-iptables-local.sh
783 richard 324
fi
325
 
326
# Journalisation et rejet des connexions (autres que celles autorisées) effectuées depuis le LAN
327
# Deny and log on INPUT from the LAN
2496 tom.houday 328
$IPTABLES -A INPUT -i $TUNIF -m conntrack --ctstate NEW -j NFLOG --nflog-group 1 --nflog-prefix "RULE rej-int -- REJECT "
783 richard 329
$IPTABLES -A INPUT -i $TUNIF -p tcp -j REJECT --reject-with tcp-reset
330
$IPTABLES -A INPUT -i $TUNIF -p udp -j REJECT --reject-with icmp-port-unreachable
331
 
1393 richard 332
# Interdiction d'accès à INTIF (n'est utile que lorsque chilli est arrêté).
783 richard 333
# Reject INTIF access (only when chilli is down)
2355 tom.houday 334
$IPTABLES -A INPUT -i $INTIF -j NFLOG --nflog-group 1 --nflog-prefix "RULE Protect1 -- REJECT "
783 richard 335
$IPTABLES -A INPUT -i $INTIF -j REJECT
336
 
337
# Journalisation et rejet des connexions initiées depuis le réseau extérieur (test des effets du paramètre --limit en cours)
338
# On EXTIF, the access attempts are log in channel 2 (we should test --limit option to avoid deny of service)
2496 tom.houday 339
$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 340
 
341
#############################
342
#        FORWARD            #
343
#############################
344
 
2841 rexy 345
# Blocage des IPs du SET bl_ip_blocked pour le SET av_bl
346
# Deny IPs of the SET bl_ip_blocked for the set av_bl
347
$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
348
$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
349
$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 350
 
2184 richard 351
# Active le suivi de session
352
# Allow Conntrack
2496 tom.houday 353
$IPTABLES -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
790 richard 354
 
2668 rexy 355
# Compute uamallowed IP (ie : IP address of equipments connected between ALCASAR and router like DMZ, own servers, etc.)
2006 raphael.pi 356
nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
357
if [ $nb_uamallowed != "0" ]
358
then
2454 tom.houday 359
	while read ip_allowed_line
1488 richard 360
	do
2006 raphael.pi 361
		ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
2496 tom.houday 362
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j NETFLOW
363
		$IPTABLES -A FORWARD -i $TUNIF -d $ip_allowed -m conntrack --ctstate NEW -j ACCEPT
2006 raphael.pi 364
	done < /usr/local/etc/alcasar-uamallowed
365
fi
492 franck 366
 
2184 richard 367
# filtrage protocole par utilisateur (profile 1 : http, https)
368
# protocols filtering for users (profil 1 : http, https)
2496 tom.houday 369
	$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
370
	$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 371
 
2184 richard 372
# filtrage protocole par utilisateur (profile 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
373
# protocols filtering for users (profil 2 : http https pop3 pop3s imap imaps ftp sftp ssh)
2006 raphael.pi 374
 
2496 tom.houday 375
	$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
376
	$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 377
 
2184 richard 378
# filtrage protocole par utilisateur (profile 3 : personnalisable via l'ACC)
379
# protocols filtering for users (profil 3 : customized with ACC)
380
custom_tcp_protocols_list='';custom_udp_protocols_list=''
2006 raphael.pi 381
while read svc_line
382
do
383
	svc_on=`echo $svc_line|cut -b1`
384
	if [ $svc_on != "#" ]
2688 lucas.echa 385
	then
2006 raphael.pi 386
		svc_name=`echo $svc_line|cut -d" " -f1`
387
		svc_port=`echo $svc_line|cut -d" " -f2`
388
		if [ $svc_name = "icmp" ]
389
		then
2184 richard 390
			svc_icmp="on"
2006 raphael.pi 391
		else
2184 richard 392
			if [ "$custom_tcp_protocols_list" == "" ]
393
			then
394
				custom_tcp_protocols_list=$svc_port
395
			else
396
				custom_tcp_protocols_list=`echo $custom_tcp_protocols_list","$svc_port`
397
			fi
398
			udp_svc=`egrep "[[:space:]]$svc_port/udp" /etc/services|wc -l`
399
			if [ $udp_svc = "1" ] # udp service exist
400
			then
401
				if [ "$custom_udp_protocols_list" == "" ]
402
				then
403
					custom_udp_protocols_list=$svc_port
404
				else
405
					custom_udp_protocols_list=`echo $custom_udp_protocols_list","$svc_port`
406
				fi
407
			fi
1488 richard 408
		fi
2006 raphael.pi 409
	fi
410
done < /usr/local/etc/alcasar-services
2184 richard 411
	if [ "$custom_tcp_protocols_list" == "" ]
412
	then
413
		$IPTABLES -A FORWARD -i $TUNIF -m set --match-set proto_3 src -s $PRIVATE_NETWORK_MASK -j REJECT
414
	else
415
		if [ "$svc_icmp" != "on" ]
416
		then
417
			$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
418
		fi
2496 tom.houday 419
		$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
420
		$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 421
	fi
1488 richard 422
 
2841 rexy 423
# Blocage des usagers 'av_wl' cherchant à joindre les IP qui ne sont pas dans la WL
424
# Block 'av_wl' users who want IP not in the WL
425
$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 426
 
2454 tom.houday 427
# journalisation et autorisation des connections sortant du LAN
476 richard 428
# Allow forward connections with log
2496 tom.houday 429
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j NETFLOW
430
$IPTABLES -A FORWARD -i $TUNIF -s $PRIVATE_NETWORK_MASK -m conntrack --ctstate NEW -j ACCEPT
1 root 431
 
783 richard 432
#############################
433
#         OUTPUT            #
434
#############################
2468 richard 435
# On laisse tout sortir à l'exception de la carte externe (cf ci-dessous)
436
# Everything is allowed apart from outside network interface (see bellow)
2213 richard 437
$IPTABLES -A OUTPUT ! -o $EXTIF -j ACCEPT
520 richard 438
 
2468 richard 439
# Si configuré, on autorise les requêtes DHCP
1587 richard 440
# Allow DHCP requests if configured
441
public_ip_mask=`grep ^PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
442
if [[ "$public_ip_mask" == "dhcp" ]]
443
then
444
	$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport 67 -j ACCEPT
445
	$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport 67 -j ACCEPT
446
fi
447
 
2454 tom.houday 448
# On autorise les requêtes DNS vers les serveurs DNS identifiés
498 richard 449
# Allow DNS requests to identified DNS servers
2496 tom.houday 450
$IPTABLES -A OUTPUT -o $EXTIF -d $DNSSERVERS -p udp --dport domain -m conntrack --ctstate NEW -j ACCEPT
783 richard 451
 
2521 armand.ito 452
# On autorise les requêtes HTTP avec log Netflow (en provenance de E2guardian)
2668 rexy 453
# HTTP requests are allowed with netflow log (from E2guardian)
1159 crox53 454
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j NETFLOW
498 richard 455
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport http -j ACCEPT
783 richard 456
 
2259 tom.houday 457
# On autorise les requêtes HTTPS sortantes
458
# HTTPS requests are allowed
459
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport https -j ACCEPT
460
 
1862 raphael.pi 461
# On autorise les requêtes RSYNC sortantes (maj BL de Toulouse)
2468 richard 462
# RSYNC requests are allowed (update of Toulouse BL)
1862 raphael.pi 463
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport rsync -j ACCEPT
464
 
2454 tom.houday 465
# On autorise les requêtes FTP
784 richard 466
# FTP requests are allowed
1705 richard 467
modprobe nf_conntrack_ftp
2642 rexy 468
$IPTABLES -t raw -A OUTPUT -p tcp --dport ftp -j CT --helper ftp
784 richard 469
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --dport ftp -j ACCEPT
2496 tom.houday 470
$IPTABLES -A OUTPUT -o $EXTIF -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
784 richard 471
 
2454 tom.houday 472
# On autorise les requêtes NTP
498 richard 473
# NTP requests are allowed
474
$IPTABLES -A OUTPUT -o $EXTIF -p udp --dport ntp -j ACCEPT
783 richard 475
 
2454 tom.houday 476
# On autorise les requêtes ICMP (ping)
503 richard 477
# ICMP (ping) requests are allowed
478
$IPTABLES -A OUTPUT -o $EXTIF -p icmp --icmp-type 8 -j ACCEPT
783 richard 479
 
2468 richard 480
# On autorise les requêtes LDAP
481
# LDAP requests are allowed
2496 tom.houday 482
$IPTABLES -A OUTPUT -o $EXTIF -p tcp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
483
$IPTABLES -A OUTPUT -o $EXTIF -p udp -m multiport --dports ldap,ldaps -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
783 richard 484
 
485
#############################
486
#       POSTROUTING         #
487
#############################
498 richard 488
# Traduction dynamique d'adresse en sortie
476 richard 489
# Dynamic NAT on EXTIF
1 root 490
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
491
 
2495 tom.houday 492
#############################
493
#          FAIL2BAN         #
494
#############################
495
# Reload Fail2Ban
2530 lucas.echa 496
if systemctl -q is-active fail2ban; then
497
	/usr/bin/fail2ban-client ping &>/dev/null && /usr/bin/fail2ban-client -q reload
498
fi