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775bd287 | 1 | ### -*-sh-*- |
bfdc045d MW |
2 | ### |
3 | ### Local firewall configuration | |
4 | ### | |
5 | ### (c) 2008 Mark Wooding | |
6 | ### | |
7 | ||
8 | ###----- Licensing notice --------------------------------------------------- | |
9 | ### | |
10 | ### This program is free software; you can redistribute it and/or modify | |
11 | ### it under the terms of the GNU General Public License as published by | |
12 | ### the Free Software Foundation; either version 2 of the License, or | |
13 | ### (at your option) any later version. | |
14 | ### | |
15 | ### This program is distributed in the hope that it will be useful, | |
16 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ### GNU General Public License for more details. | |
19 | ### | |
20 | ### You should have received a copy of the GNU General Public License | |
21 | ### along with this program; if not, write to the Free Software Foundation, | |
22 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | ||
24 | ###-------------------------------------------------------------------------- | |
25 | ### Packet classification. | |
26 | ||
27 | ## Define the available network classes. | |
28 | m4_divert(42)m4_dnl | |
29 | defnetclass untrusted untrusted trusted | |
30 | defnetclass trusted untrusted trusted safe noloop | |
31 | defnetclass safe trusted safe noloop | |
32 | defnetclass noloop trusted safe | |
33 | m4_divert(-1)m4_dnl | |
34 | ||
35 | ###-------------------------------------------------------------------------- | |
36 | ### Network layout. | |
37 | ||
38 | m4_divert(46)m4_dnl | |
39 | ## Networks and routing. | |
40 | ||
bfdc045d | 41 | defiface $if_untrusted \ |
f98dfdf6 | 42 | untrusted:172.29.198.0/25 |
bfdc045d | 43 | defvpn $if_vpn safe 172.29.199.128/27 \ |
9ec5456a MW |
44 | crybaby:172.29.199.129 \ |
45 | terror:172.29.199.130 | |
f98dfdf6 | 46 | defiface $if_iodine untrusted:172.29.198.128/28 |
bfdc045d MW |
47 | defiface $if_its_mz safe:172.29.199.160/30 |
48 | defiface $if_its_pi safe:192.168.0.0/24 | |
422ec1b2 MW |
49 | defiface $if_trusted \ |
50 | trusted:172.29.199.0/26 \ | |
51 | safe:172.29.199.64/27 \ | |
52 | untrusted:default | |
bfdc045d | 53 | |
1ee6211d MW |
54 | ## Default NTP servers. |
55 | ntp_servers="158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232" | |
56 | ||
bfdc045d MW |
57 | m4_divert(60)m4_dnl |
58 | ###-------------------------------------------------------------------------- | |
59 | ### Special forwarding exemptions. | |
60 | ||
61 | ## Allow ping from safe/noloop to untrusted networks. | |
62 | run iptables -A FORWARD -j ACCEPT \ | |
ecdca131 | 63 | -p icmp ! -f --icmp-type echo-request \ |
bfdc045d MW |
64 | -m mark --mark $to_untrusted/$MASK_TO |
65 | run iptables -A FORWARD -j ACCEPT \ | |
ecdca131 | 66 | -p icmp ! -f --icmp-type echo-reply \ |
bfdc045d MW |
67 | -m mark --mark $from_untrusted/$MASK_FROM \ |
68 | -m state --state ESTABLISHED | |
0291d6d5 MW |
69 | run ip6tables -A FORWARD -j ACCEPT \ |
70 | -p ipv6-icmp --icmpv6-type echo-request \ | |
71 | -m ipv6header --soft ! --header frag \ | |
72 | -m mark --mark $to_untrusted/$MASK_TO | |
73 | run ip6tables -A FORWARD -j ACCEPT \ | |
74 | -p ipv6-icmp --icmpv6-type echo-reply \ | |
75 | -m ipv6header --soft ! --header frag \ | |
76 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
77 | -m state --state ESTABLISHED | |
bfdc045d MW |
78 | |
79 | ## Allow SSH from safe/noloop to untrusted networks. | |
80 | run iptables -A FORWARD -j ACCEPT \ | |
12ac65a1 | 81 | -p tcp ! -f --destination-port $port_ssh \ |
bfdc045d MW |
82 | -m mark --mark $to_untrusted/$MASK_TO |
83 | run iptables -A FORWARD -j ACCEPT \ | |
ecdca131 | 84 | -p tcp ! -f --source-port $port_ssh \ |
bfdc045d MW |
85 | -m mark --mark $from_untrusted/$MASK_FROM \ |
86 | -m state --state ESTABLISHED | |
0291d6d5 MW |
87 | run ip6tables -A FORWARD -j ACCEPT \ |
88 | -p tcp --destination-port $port_ssh \ | |
89 | -m ipv6header --soft ! --header frag \ | |
90 | -m mark --mark $to_untrusted/$MASK_TO | |
91 | run ip6tables -A FORWARD -j ACCEPT \ | |
92 | -p tcp --source-port $port_ssh \ | |
93 | -m ipv6header --soft ! --header frag \ | |
94 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
95 | -m state --state ESTABLISHED | |
bfdc045d | 96 | |
ade2c052 MW |
97 | m4_divert(60)m4_dnl |
98 | ###-------------------------------------------------------------------------- | |
99 | ### Kill things we don't understand properly. | |
100 | ### | |
101 | ### I don't like having to do this, but since I don't know how to do proper | |
102 | ### multicast filtering, I'm just going to ban it from being forwarded. | |
103 | ||
104 | errorchain poorly-understood REJECT | |
105 | ||
106 | ## Ban multicast destination addresses in forwarding. | |
107 | run iptables -A FORWARD -g poorly-understood \ | |
108 | -d 224.0.0.0/4 | |
109 | run ip6tables -A FORWARD -g poorly-understood \ | |
110 | -d ff::/8 | |
111 | ||
bfdc045d MW |
112 | m4_divert(80)m4_dnl |
113 | ###-------------------------------------------------------------------------- | |
114 | ### Locally-bound packet inspection. | |
115 | ||
116 | clearchain inbound | |
117 | ||
118 | ## Track connections. | |
ecdca131 | 119 | commonrules inbound |
bfdc045d MW |
120 | conntrack inbound |
121 | ||
122 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
123 | ## local request. | |
124 | run iptables -A inbound -j ACCEPT \ | |
125 | -s 0.0.0.0 -d 255.255.255.255 \ | |
126 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
127 | run iptables -A inbound -j ACCEPT \ | |
128 | -s 172.29.198.0/23 \ | |
129 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
130 | ||
429f4314 MW |
131 | ## Incoming broadcast multicast on a network interface associated with the |
132 | ## trusted network is OK, since it must have originated there (or been | |
133 | ## forwarded, but we don't do that yet). | |
134 | run iptables -A inbound -j ACCEPT \ | |
135 | -s 0.0.0.0 -d 224.0.0.0/24 \ | |
136 | -i $if_trusted | |
137 | ||
bfdc045d | 138 | ## Allow incoming ping. This is the only ICMP left. |
0291d6d5 | 139 | run ip46tables -A inbound -j ACCEPT -p icmp |
bfdc045d MW |
140 | |
141 | m4_divert(88)m4_dnl | |
142 | ## Allow unusual things. | |
143 | openports inbound | |
144 | ||
145 | ## Inspect inbound packets from untrusted sources. | |
0291d6d5 MW |
146 | run ip46tables -A inbound -j forbidden |
147 | run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound | |
bfdc045d MW |
148 | |
149 | ## Otherwise process as indicated by the mark. | |
150 | for i in INPUT FORWARD; do | |
0291d6d5 | 151 | run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT |
bfdc045d MW |
152 | done |
153 | ||
154 | m4_divert(-1) | |
155 | ###----- That's all, folks -------------------------------------------------- |