firewall: Allow blocking access to GREEN from GREEN.
[people/teissler/ipfire-2.x.git] / config / firewall / firewall-policy
1 #!/bin/sh
2 ###############################################################################
3 # #
4 # IPFire.org - A linux based firewall #
5 # Copyright (C) 2013 Alexander Marx <amarx@ipfire.org> #
6 # #
7 # This program is free software: you can redistribute it and/or modify #
8 # it under the terms of the GNU General Public License as published by #
9 # the Free Software Foundation, either version 3 of the License, or #
10 # (at your option) any later version. #
11 # #
12 # This program is distributed in the hope that it will be useful, #
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of #
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
15 # GNU General Public License for more details. #
16 # #
17 # You should have received a copy of the GNU General Public License #
18 # along with this program. If not, see <http://www.gnu.org/licenses/>. #
19 # #
20 ###############################################################################
21
22 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
23 eval $(/usr/local/bin/readhash /var/ipfire/firewall/settings)
24 eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
25
26 function iptables() {
27 /sbin/iptables --wait "$@"
28 }
29
30 iptables -F POLICYFWD
31 iptables -F POLICYOUT
32 iptables -F POLICYIN
33
34 if [ -f "/var/ipfire/red/iface" ]; then
35 IFACE="$(</var/ipfire/red/iface)"
36 fi
37
38 # Figure out what devices are configured.
39 HAVE_BLUE="false"
40 HAVE_ORANGE="false"
41
42 case "${CONFIG_TYPE}" in
43 2)
44 HAVE_ORANGE="true"
45 ;;
46 3)
47 HAVE_BLUE="true"
48 ;;
49 4)
50 HAVE_BLUE="true"
51 HAVE_ORANGE="true"
52 ;;
53 esac
54
55 HAVE_IPSEC="true"
56 HAVE_OPENVPN="true"
57
58 # INPUT
59
60 # Allow access from GREEN
61 iptables -A POLICYIN -i "${GREEN_DEV}" -j ACCEPT
62
63 # IPsec INPUT
64 case "${HAVE_IPSEC},${POLICY}" in
65 true,MODE1) ;;
66 true,*)
67 iptables -A POLICYIN -m policy --pol ipsec --dir in -j ACCEPT
68 ;;
69 esac
70
71 # OpenVPN INPUT
72 # Allow direct access to the internal IP addresses of the firewall
73 # from remote subnets if forward policy is allowed.
74 case "${HAVE_OPENVPN},${POLICY}" in
75 true,MODE1) ;;
76 true,*)
77 iptables -A POLICYIN -i tun+ -j ACCEPT
78 ;;
79 esac
80
81 case "${FWPOLICY2}" in
82 REJECT)
83 if [ "${DROPINPUT}" = "on" ]; then
84 iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "REJECT_INPUT "
85 fi
86 iptables -A POLICYIN -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_INPUT"
87 ;;
88 *) # DROP
89 if [ "${DROPINPUT}" = "on" ]; then
90 iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
91 fi
92 iptables -A POLICYIN -j DROP -m comment --comment "DROP_INPUT"
93 ;;
94 esac
95
96 # FORWARD
97 case "${POLICY}" in
98 MODE1)
99 case "${FWPOLICY}" in
100 REJECT)
101 if [ "${DROPFORWARD}" = "on" ]; then
102 iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "REJECT_FORWARD "
103 fi
104 iptables -A POLICYFWD -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_FORWARD"
105 ;;
106 *) # DROP
107 if [ "${DROPFORWARD}" = "on" ]; then
108 iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
109 fi
110 iptables -A POLICYFWD -j DROP -m comment --comment "DROP_FORWARD"
111 ;;
112 esac
113 ;;
114
115 *)
116 # Access from GREEN is granted to everywhere
117 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
118 # internet via green
119 # don't check source IP/NET if IFACE is GREEN
120 iptables -A POLICYFWD -i "${GREEN_DEV}" -j ACCEPT
121 else
122 iptables -A POLICYFWD -i "${GREEN_DEV}" -s "${GREEN_NETADDRESS}/${GREEN_NETMASK}" -j ACCEPT
123 fi
124
125 # Grant access for IPsec VPN connections
126 iptables -A POLICYFWD -m policy --pol ipsec --dir in -j ACCEPT
127
128 # Grant access for OpenVPN connections
129 iptables -A POLICYFWD -i tun+ -j ACCEPT
130
131 if [ -n "${IFACE}" ]; then
132 if [ "${HAVE_BLUE}" = "true" ] && [ -n "${BLUE_DEV}" ]; then
133 iptables -A POLICYFWD -i "${BLUE_DEV}" -s "${BLUE_NETADDRESS}/${BLUE_NETMASK}" -o "${IFACE}" -j ACCEPT
134 fi
135
136 if [ "${HAVE_ORANGE}" = "true" ] && [ -n "${ORANGE_DEV}" ]; then
137 iptables -A POLICYFWD -i "${ORANGE_DEV}" -s "${ORANGE_NETADDRESS}/${ORANGE_NETMASK}" -o "${IFACE}" -j ACCEPT
138 fi
139 fi
140
141 if [ "${DROPFORWARD}" = "on" ]; then
142 iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
143 fi
144 iptables -A POLICYFWD -m comment --comment "DROP_FORWARD" -j DROP
145 ;;
146 esac
147
148 # OUTGOING
149 case "${POLICY1}" in
150 MODE1)
151 case "${FWPOLICY1}" in
152 REJECT)
153 if [ "${DROPOUTGOING}" = "on" ]; then
154 iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "REJECT_OUTPUT "
155 fi
156 iptables -A POLICYOUT -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_OUTPUT"
157 ;;
158 *) # DROP
159 if [ "${DROPOUTGOING}" == "on" ]; then
160 iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
161 fi
162 iptables -A POLICYOUT -j DROP -m comment --comment "DROP_OUTPUT"
163 ;;
164 esac
165 ;;
166 *)
167 iptables -A POLICYOUT -j ACCEPT
168 iptables -A POLICYOUT -m comment --comment "DROP_OUTPUT" -j DROP
169 ;;
170 esac
171
172 exit 0