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#!/bin/bash
 1 
#!/bin/bash
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# $Id: alcasar-iptables-bypass.sh 1469 2014-10-30 21:58:47Z richard $
 2 
# $Id: alcasar-iptables-bypass.sh 1523 2014-12-20 18:30:19Z franck $
3 
 
 3 
 
4 
# alcasar-iptables-bypass.sh
 4 
# alcasar-iptables-bypass.sh
5 
# by Rexy - 3abtux
 5 
# by Rexy - 3abtux
6 
# This script is distributed under the Gnu General Public License (GPL)
 6 
# This script is distributed under the Gnu General Public License (GPL)
7 
 
 7 
 
8 
# applique les regles du parefeu en mode ByPass
 8 
# applique les regles du parefeu en mode ByPass
9 
# put the firewall rules in 'ByPass' mode
 9 
# put the firewall rules in 'ByPass' mode
10 
 
 10 
 
11 
CONF_FILE="/usr/local/etc/alcasar.conf"
 11 
CONF_FILE="/usr/local/etc/alcasar.conf"
12 
private_ip_mask=`grep PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
 12 
private_ip_mask=`grep PRIVATE_IP= $CONF_FILE|cut -d"=" -f2`
13 
private_ip_mask=${private_ip_mask:=192.168.182.1/24}
 13 
private_ip_mask=${private_ip_mask:=192.168.182.1/24}
14 
private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
 14 
private_network=`/bin/ipcalc -n $private_ip_mask|cut -d"=" -f2`		# LAN IP address (ie.: 192.168.182.0)
15 
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
 15 
private_prefix=`/bin/ipcalc -p $private_ip_mask|cut -d"=" -f2`		# LAN prefix (ie. 24)
16 
IPTABLES="/sbin/iptables"
 16 
IPTABLES="/sbin/iptables"
17 
EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`				# EXTernal InterFace
 17 
EXTIF=`grep ^EXTIF= $CONF_FILE|cut -d"=" -f2`				# EXTernal InterFace
18 
INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2`				# INTernal InterFace
 18 
INTIF=`grep ^INTIF= $CONF_FILE|cut -d"=" -f2`				# INTernal InterFace
19 
PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
 19 
PRIVATE_NETWORK_MASK=$private_network/$private_prefix			# Lan IP address + prefix (192.168.182.0/24)
20 
PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
 20 
PRIVATE_IP=`echo $private_ip_mask | cut -d"/" -f1`			# ALCASAR LAN IP address
21 
public_ip_mask=`grep PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
 21 
public_ip_mask=`grep PUBLIC_IP= $CONF_FILE|cut -d"=" -f2`		# ALCASAR WAN IP address
22 
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
 22 
PUBLIC_IP=`echo $public_ip_mask | cut -d"/" -f1`
23 
SSH=`grep SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
 23 
SSH=`grep SSH= $CONF_FILE|cut -d"=" -f2`				# sshd active (on/off)
24 
SSH=${SSH:=off}
 24 
SSH=${SSH:=off}
25 
SSH_ADMIN_FROM=`grep SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
 25 
SSH_ADMIN_FROM=`grep SSH_ADMIN_FROM= $CONF_FILE|cut -d"=" -f2`
26 
SSH_ADMIN_FROM=${SSH_ADMIN_FROM:="0.0.0.0/0.0.0.0"}				# WAN IP address to reduce ssh access (all ip allowed on LAN side)
 26 
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)
- 
 
 27 
PROTOCOLS_FILTERING=`grep PROTOCOLS_FILTERING= $conf_file|cut -d"=" -f2`        # Network protocols filter (on/off)
- 
 
 28 
PROTOCOLS_FILTERING=${PROTOCOLS_FILTERING:=off}
27 
 
 29 
 
28 
 
 30 
 
29 
# On vide (flush) toutes les règles existantes
 31 
# On vide (flush) toutes les règles existantes
30 
# Flush all existing rules
 32 
# Flush all existing rules
31 
$IPTABLES -F
 33 
$IPTABLES -F
32 
$IPTABLES -t nat -F
 34 
$IPTABLES -t nat -F
33 
$IPTABLES -F INPUT
 35 
$IPTABLES -F INPUT
34 
$IPTABLES -F FORWARD
 36 
$IPTABLES -F FORWARD
35 
$IPTABLES -F OUTPUT
 37 
$IPTABLES -F OUTPUT
36 
 
 38 
 
37 
# On indique les politiques par défaut
 39 
# On indique les politiques par défaut
38 
# Default policies
 40 
# Default policies
39 
$IPTABLES -P INPUT DROP
 41 
$IPTABLES -P INPUT DROP
40 
$IPTABLES -P FORWARD DROP
 42 
$IPTABLES -P FORWARD DROP
41 
$IPTABLES -P OUTPUT ACCEPT
 43 
$IPTABLES -P OUTPUT ACCEPT
42 
$IPTABLES -t nat -P PREROUTING ACCEPT
 44 
$IPTABLES -t nat -P PREROUTING ACCEPT
43 
$IPTABLES -t nat -P POSTROUTING ACCEPT
 45 
$IPTABLES -t nat -P POSTROUTING ACCEPT
44 
$IPTABLES -t nat -P OUTPUT ACCEPT
 46 
$IPTABLES -t nat -P OUTPUT ACCEPT
45 
 
 47 
 
46 
# On efface toutes les chaînes qui ne sont pas par défaut dans les tables filter et nat
 48 
# On efface toutes les chaînes qui ne sont pas par défaut dans les tables filter et nat
47 
# Flush non default rules on filter and nat tables
 49 
# Flush non default rules on filter and nat tables
48 
$IPTABLES -X
 50 
$IPTABLES -X
49 
$IPTABLES -t nat -X
 51 
$IPTABLES -t nat -X
50 
 
 52 
 
51 
# On autorise tout sur loopback
 53 
# On autorise tout sur loopback
52 
# accept all on loopback
 54 
# accept all on loopback
53 
$IPTABLES -A OUTPUT -o lo -j ACCEPT
 55 
$IPTABLES -A OUTPUT -o lo -j ACCEPT
54 
$IPTABLES -A INPUT -i lo -j ACCEPT
 56 
$IPTABLES -A INPUT -i lo -j ACCEPT
55 
 
 57 
 
56 
# Insertion de règles de blocage (Devel)
 58 
# Insertion de règles de blocage (Devel)
57 
# Here, we add block rules (Devel)
 59 
# Here, we add block rules (Devel)
58 
if [ -s /usr/local/etc/alcasar-iptables-block ]; then
60 
if [ -s /usr/local/etc/alcasar-iptables-block ]; then
59 
	while read ip_line
 61 
	while read ip_line
60 
	do
 62 
	do
61 
		ip_on=`echo $ip_line|cut -b1`
 63 
		ip_on=`echo $ip_line|cut -b1`
62 
		if [ $ip_on != "#" ]
 64 
		if [ $ip_on != "#" ]
63 
		then
65 
		then
64 
			ip_blocked=`echo $ip_line|cut -d" " -f1`
 66 
			ip_blocked=`echo $ip_line|cut -d" " -f1`
65 
			$IPTABLES -A FORWARD -d $ip_blocked -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
 67 
			$IPTABLES -A FORWARD -d $ip_blocked -j ULOG --ulog-prefix "RULE IP-blocked -- REJECT "
66 
			$IPTABLES -A FORWARD -d $ip_blocked -j REJECT
 68 
			$IPTABLES -A FORWARD -d $ip_blocked -j REJECT
67 
		fi
 69 
		fi
68 
	done < /usr/local/etc/alcasar-iptables-block
 70 
	done < /usr/local/etc/alcasar-iptables-block
69 
fi
 71 
fi
70 
 
 72 
 
71 
# SSHD rules if activate
73 
# SSHD rules if activate
72 
if [ $SSH = on ]
 74 
if [ $SSH = on ]
73 
	then
 75 
	then
74 
	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
 76 
	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-LAN -- ACCEPT"
75 
	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
 77 
	$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -d $PRIVATE_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
76 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW --syn -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
 78 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ULOG --ulog-nlgroup 2 --ulog-prefix "RULE ssh-from-WAN -- ACCEPT"
77 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
 79 
	$IPTABLES -A INPUT -i $EXTIF -s $SSH_ADMIN_FROM -d $PUBLIC_IP -p tcp --dport ssh -m state --state NEW -j ACCEPT
78 
fi
 80 
fi
79 
 
 81 
 
80 
# Insertion de règles locales
 82 
# Insertion de règles locales
81 
# Here, we add local rules (i.e. VPN from Internet)
 83 
# Here, we add local rules (i.e. VPN from Internet)
82 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
 84 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
83 
        . /usr/local/etc/alcasar-iptables-local.sh
 85 
        . /usr/local/etc/alcasar-iptables-local.sh
84 
fi
 86 
fi
85 
 
 87 
 
- 
 
 88 
#  If protocols filter is activate
- 
 
 89 
if [ $PROTOCOLS_FILTERING = on ]; then
- 
 
 90 
        echo "PROTOCOL FILTERING = On"
- 
 
 91 
        # Compute exception IP (IP addresses that shouldn't be filtered)
- 
 
 92 
       nb_exceptions=`wc -l /usr/local/etc/alcasar-filter-exceptions | cut -d" " -f1`
- 
 
 93 
       if [ $nb_exceptions != "0" ]
- 
 
 94 
       then
- 
 
 95 
               while read ip_exception
- 
 
 96 
               do
- 
 
 97 
                       $IPTABLES -A FORWARD -i $INTIF -s $ip_exception -m state --state NEW -j ULOG --ulog-prefix "RULE IP-exception -- ACCEPT "
- 
 
 98 
#                       $IPTABLES -A FORWARD -i $INTIF -s $ip_exception -m state --state NEW -j NETFLOW
- 
 
 99 
                       $IPTABLES -A FORWARD -i $INTIF -s $ip_exception -m state --state NEW -j ACCEPT
- 
 
 100 
               done < /usr/local/etc/alcasar-filter-exceptions
- 
 
 101 
       fi
- 
 
 102 
#       # Compute uamallowed IP (IP address of equipments connected between ALCASAR and Internet (DMZ, own servers, ...)
- 
 
 103 
#       nb_uamallowed=`wc -l /usr/local/etc/alcasar-uamallowed | cut -d" "  -f1`
- 
 
 104 
#       if [ $nb_uamallowed != "0" ]
- 
 
 105 
#       then
- 
 
 106 
#               while read ip_allowed_line
- 
 
 107 
#               do
- 
 
 108 
#                       ip_allowed=`echo $ip_allowed_line|cut -d"\"" -f2`
- 
 
 109 
#                       $IPTABLES -A FORWARD -i $INTIF -d $ip_allowed -m state --state NEW -j ULOG --ulog-prefix "RULE IP-allowed -- ACCEPT "
- 
 
 110 
##                       $IPTABLES -A FORWARD -i $INTIF -d $ip_allowed -m state --state NEW -j NETFLOW
- 
 
 111 
#                       $IPTABLES -A FORWARD -i $INTIF -d $ip_allowed -m state --state NEW -j ACCEPT
- 
 
 112 
#               done < /usr/local/etc/alcasar-uamallowed
- 
 
 113 
#       fi
- 
 
 114 
        # Autorisation des protocoles non commentés
- 
 
 115 
        # Allow non comment protocols
- 
 
 116 
        while read svc_line
- 
 
 117 
        do
- 
 
 118 
                svc_on=`echo $svc_line|cut -b1`
- 
 
 119 
                if [ $svc_on != "#" ]
- 
 
 120 
                then
- 
 
 121 
                        svc_name=`echo $svc_line|cut -d" " -f1`
- 
 
 122 
                        svc_port=`echo $svc_line|cut -d" " -f2`
- 
 
 123 
                        if [ $svc_name = "icmp" ]
- 
 
 124 
                        then
- 
 
 125 
#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp -j NETFLOW
- 
 
 126 
                                $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp -j ACCEPT
- 
 
 127 
                        else
- 
 
 128 
                                echo "Service = $svc_port  pour $svc_name"
- 
 
 129 
                                $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-$svc_name -- ACCEPT "
- 
 
 130 
#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j NETFLOW
- 
 
 131 
                                $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport $svc_port -m state --state NEW -j ACCEPT
- 
 
 132 
#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ULOG --ulog-prefix "RULE F_UDP-$svc_name -- ACCEPT "
- 
 
 133 
##                              $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j NETFLOW
- 
 
 134 
#                               $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p udp --dport $svc_port -m state --state NEW -j ACCEPT
- 
 
 135 
                        fi
- 
 
 136 
                fi
- 
 
 137 
        done < /usr/local/etc/alcasar-services
- 
 
 138 
        # Don't forget the HTTP port
- 
 
 139 
	$IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 80 -m state --state NEW -j ULOG --ulog-prefix "RULE F_TCP-http -- ACCEPT "
- 
 
 140 
#       $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 80 -m state --state NEW -j NETFLOW
- 
 
 141 
        $IPTABLES -A FORWARD -i $INTIF -s $PRIVATE_NETWORK_MASK -p tcp --dport 80 -m state --state NEW -j ACCEPT
- 
 
 142 
 
- 
 
 143 
        # Rejet explicite des autres protocoles
- 
 
 144 
        # reject the others protocols
- 
 
 145 
        $IPTABLES -A FORWARD -i $INTIF -j ULOG --ulog-prefix "RULE F_filter -- REJECT "
- 
 
 146 
        $IPTABLES -A FORWARD -i $INTIF -p tcp -j REJECT --reject-with tcp-reset
- 
 
 147 
        $IPTABLES -A FORWARD -i $INTIF -p udp -j REJECT --reject-with icmp-port-unreachable
- 
 
 148 
        $IPTABLES -A FORWARD -i $INTIF -p icmp -j REJECT
- 
 
 149 
 
- 
 
 150 
else
- 
 
 151 
        ## On autorise les demandes de connexions sortantes
- 
 
 152 
        echo "PROTOCOL FILTERING = Off"
- 
 
 153 
        $IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ULOG --ulog-prefix "RULE Transfert -- ACCEPT "
- 
 
 154 
        $IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT
- 
 
 155 
fi
- 
 
 156 
 
86 
# on autorise les requêtes dhcp
 157 
# on autorise les requêtes dhcp
87 
# accept dhcp
 158 
# accept dhcp
88 
$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
 159 
$IPTABLES -A INPUT -i $INTIF -p udp -m udp --sport bootpc --dport bootps -j ACCEPT
89 
 
 160 
 
90 
# On drop le broadcast et le multicast sur les interfaces (sans Log)
 161 
# On drop le broadcast et le multicast sur les interfaces (sans Log)
91 
# Drop broadcast & multicast
 162 
# Drop broadcast & multicast
92 
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
 163 
$IPTABLES -A INPUT -m addrtype --dst-type BROADCAST,MULTICAST -j DROP
93 
 
 164 
 
94 
# On laisse passer les ICMP echo-request et echo-reply en provenance du LAN
 165 
# On laisse passer les ICMP echo-request et echo-reply en provenance du LAN
95 
# Allow ping (icmp N°0 & 8) from LAN
 166 
# Allow ping (icmp N°0 & 8) from LAN
96 
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT
 167 
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 0 -j ACCEPT
97 
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT
 168 
$IPTABLES -A INPUT -i $INTIF -s $PRIVATE_NETWORK_MASK -p icmp --icmp-type 8 -j ACCEPT
98 
 
 169 
 
99 
#  On ajoute ici les règles spécifiques de filtrage réseau (accès exterieur ...)
 - 
 
100 
if [ -f /usr/local/etc/alcasar-iptables-local.sh ]; then
 - 
 
101 
        . /usr/local/etc/alcasar-iptables-local.sh
 - 
 
102 
fi
 - 
 
103 
 
 - 
 
104 
# On autorise les retours de connexions légitimes par FORWARD
 170 
# On autorise les retours de connexions légitimes par FORWARD
105 
# Conntrack on forward
 171 
# Conntrack on forward
106 
$IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
 172 
$IPTABLES -A FORWARD -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT
107 
 
 - 
 
108 
# On autorise les demandes de connexions sortantes
 - 
 
109 
$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ULOG --ulog-prefix "RULE Transfert -- ACCEPT "
 - 
 
110 
$IPTABLES -A FORWARD -i $INTIF -m state --state NEW -j ACCEPT
 173 
$IPTABLES -A FORWARD -p udp -j DROP
111 
 
 174 
 
112 
# On autorise les flux entrant ntp et dns via INTIF
 175 
# On autorise les flux entrant ntp et dns via INTIF
113 
$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT
 176 
$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport domain -j ACCEPT
114 
$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
 177 
$IPTABLES -A INPUT -i $INTIF -d $PRIVATE_IP -p udp --dport ntp -j ACCEPT
115 
 
 178 
 
116 
# On autorise le retour des connexions entrante déjà acceptées
 179 
# On autorise le retour des connexions entrante déjà acceptées
117 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
 180 
$IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
118 
 
 181 
 
119 
# On interdit et on log le reste sur les 2 interfaces d'accès
 182 
# On interdit et on log le reste sur les 2 interfaces d'accès
120 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
 183 
$IPTABLES -A INPUT -i $INTIF -j ULOG --ulog-prefix "RULE rej-int -- REJECT "
121 
$IPTABLES -A INPUT -i $EXTIF -j ULOG --ulog-prefix "RULE rej-ext -- REJECT "
 184 
$IPTABLES -A INPUT -i $EXTIF -j ULOG --ulog-prefix "RULE rej-ext -- REJECT "
122 
$IPTABLES -A INPUT -p tcp -j REJECT --reject-with tcp-reset
 185 
$IPTABLES -A INPUT -p tcp -j REJECT --reject-with tcp-reset
123 
$IPTABLES -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
 186 
$IPTABLES -A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
124 
 
 187 
 
125 
# On active le masquage d'adresse par translation (NAT)
 188 
# On active le masquage d'adresse par translation (NAT)
126 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
 189 
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
127 
 
 190 
 
128 
# on ne sauvegarde pas les règles. En cas de reboot, on repasse ainsi automatiquement en mode normal (bypass -off)
 191 
# on ne sauvegarde pas les règles. En cas de reboot, on repasse ainsi automatiquement en mode normal (bypass -off)
129 
# Fin du script des regles du parefeu
 192 
# Fin du script des regles du parefeu
130 
 
 193 
 
131 
 
 194 
 
132 
Generated by GNU Enscript 1.6.6.
 195 
Generated by GNU Enscript 1.6.6.
133 
 
 196 
 
134 
 
 197 
 
135 
 
 198