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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 | ###-------------------------------------------------------------------------- | |
335b2afe MW |
25 | ### Local configuration. |
26 | ||
27 | m4_divert(6)m4_dnl | |
28 | ## Default NTP servers. | |
29 | defconf(ntp_servers, | |
30 | "158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232") | |
31 | ||
32 | m4_divert(-1) | |
33 | ###-------------------------------------------------------------------------- | |
bfdc045d MW |
34 | ### Packet classification. |
35 | ||
36 | ## Define the available network classes. | |
37 | m4_divert(42)m4_dnl | |
44f95827 MW |
38 | defnetclass untrusted untrusted trusted mcast |
39 | defnetclass trusted untrusted trusted safe noloop mcast | |
40 | defnetclass safe trusted safe noloop mcast | |
41 | defnetclass noloop trusted safe mcast | |
42 | defnetclass link | |
43 | defnetclass mcast | |
a4d8cae3 | 44 | m4_divert(-1) |
bfdc045d | 45 | |
a4d8cae3 | 46 | m4_divert(26)m4_dnl |
bfdc045d MW |
47 | ###-------------------------------------------------------------------------- |
48 | ### Network layout. | |
49 | ||
beb4f0ee MW |
50 | ## House networks. |
51 | defnet dmz trusted | |
b9e891b5 | 52 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
beb4f0ee MW |
53 | forwards unsafe untrusted |
54 | defnet unsafe trusted | |
b9e891b5 | 55 | addr 172.29.199.0/25 2001:470:9740:1::/64 |
beb4f0ee MW |
56 | forwards househub |
57 | defnet safe safe | |
216285e1 | 58 | addr 172.29.199.192/27 2001:470:9740:4001::/64 |
beb4f0ee MW |
59 | forwards househub |
60 | defnet untrusted untrusted | |
b9e891b5 | 61 | addr 172.29.198.0/25 2001:470:9740:8001::/64 |
beb4f0ee MW |
62 | forwards househub |
63 | defnet vpn safe | |
b9e891b5 | 64 | addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 |
f967aa21 | 65 | forwards househub colohub |
beb4f0ee MW |
66 | host crybaby 1 |
67 | host terror 2 | |
68 | defnet iodine untrusted | |
69 | addr 172.29.198.128/28 | |
bfdc045d | 70 | |
beb4f0ee MW |
71 | defnet househub virtual |
72 | forwards housebdry dmz unsafe safe untrusted | |
73 | defnet housebdry virtual | |
74 | forwards househub hub | |
75 | noxit dmz | |
76 | ||
77 | ## House hosts. | |
78 | defhost radius | |
183dccdc | 79 | hosttype router |
e66833d3 MW |
80 | iface eth0 dmz unsafe safe |
81 | iface eth1 dmz unsafe safe | |
beb4f0ee MW |
82 | iface eth2 safe |
83 | iface eth3 untrusted | |
84 | defhost roadstar | |
ce6434f7 MW |
85 | iface eth0 dmz unsafe |
86 | iface eth1 dmz unsafe | |
beb4f0ee | 87 | defhost jem |
ce6434f7 MW |
88 | iface eth0 dmz unsafe |
89 | iface eth1 dmz unsafe | |
beb4f0ee | 90 | defhost artist |
ce6434f7 MW |
91 | iface eth0 dmz unsafe |
92 | iface eth1 dmz unsafe | |
beb4f0ee | 93 | defhost vampire |
183dccdc | 94 | hosttype router |
c8dab9d2 MW |
95 | iface eth0.0 dmz unsafe safe default |
96 | iface eth0.1 dmz unsafe safe default | |
e66833d3 | 97 | iface eth0.2 safe |
9ae82479 | 98 | iface eth0.3 untrusted default |
beb4f0ee MW |
99 | iface dns0 dns |
100 | iface vpn-+ vpn | |
101 | iface vpn-precision colobdry vpn | |
9ae82479 | 102 | iface t6-he default |
beb4f0ee | 103 | defhost ibanez |
06ff8082 | 104 | iface br-dmz dmz unsafe |
beb4f0ee MW |
105 | iface br-unsafe unsafe |
106 | ||
107 | defhost gibson | |
183dccdc | 108 | hosttype client |
beb4f0ee MW |
109 | iface eth0 unsafe |
110 | ||
111 | ## Colocated networks. | |
112 | defnet jump trusted | |
b9e891b5 | 113 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 |
beb4f0ee MW |
114 | forwards colohub |
115 | defnet colo trusted | |
b9e891b5 | 116 | addr 172.29.199.176/28 2001:ba8:1d9:2::/64 |
beb4f0ee MW |
117 | forwards colohub |
118 | defnet colohub virtual | |
119 | forwards colobdry jump colo | |
120 | defnet colobdry virtual | |
121 | forwards colohub hub | |
122 | noxit jump | |
123 | ||
124 | ## Colocated hosts. | |
125 | defhost fender | |
ce6434f7 MW |
126 | iface br-jump jump colo |
127 | iface br-colo jump colo | |
beb4f0ee | 128 | defhost precision |
183dccdc | 129 | hosttype router |
ce6434f7 MW |
130 | iface eth0 jump colo |
131 | iface eth1 jump colo | |
beb4f0ee MW |
132 | iface vpn-+ vpn |
133 | iface vpn-vampire housebdry vpn | |
134 | defhost telecaster | |
ce6434f7 MW |
135 | iface eth0 jump colo |
136 | iface eth1 jump colo | |
beb4f0ee | 137 | defhost stratocaster |
ce6434f7 MW |
138 | iface eth0 jump colo |
139 | iface eth1 jump colo | |
beb4f0ee | 140 | defhost jazz |
ce6434f7 MW |
141 | iface eth0 jump colo |
142 | iface eth1 jump colo | |
beb4f0ee MW |
143 | |
144 | ## Other networks. | |
145 | defnet hub virtual | |
146 | forwards housebdry colobdry | |
147 | defnet default untrusted | |
b9e891b5 MW |
148 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
149 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 | |
150 | addr 2001:ba8:1d9::/48 #temporary | |
beb4f0ee | 151 | forwards dmz untrusted unsafe jump colo |
1ee6211d | 152 | |
a4d8cae3 | 153 | m4_divert(80)m4_dnl |
bfdc045d MW |
154 | ###-------------------------------------------------------------------------- |
155 | ### Special forwarding exemptions. | |
156 | ||
78af294c MW |
157 | case $forward in |
158 | 1) | |
159 | ||
160 | ## Only allow these packets if they're not fragmented. (Don't trust safe | |
161 | ## hosts's fragment reassembly to be robust against malicious fragments.) | |
162 | ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning | |
163 | ## of `! -f', so we do the negation using early return from a subchain. | |
164 | clearchain fwd-spec-nofrag | |
165 | run iptables -A fwd-spec-nofrag -j RETURN --fragment | |
166 | run ip6tables -A fwd-spec-nofrag -j RETURN \ | |
167 | -m ipv6header --soft --header frag | |
87bf1592 | 168 | run ip46tables -A FORWARD -j fwd-spec-nofrag |
78af294c MW |
169 | |
170 | ## Allow ping from safe/noloop to untrusted networks. | |
171 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
172 | -p icmp --icmp-type echo-request \ | |
173 | -m mark --mark $to_untrusted/$MASK_TO | |
174 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
175 | -p icmp --icmp-type echo-reply \ | |
176 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
177 | -m state --state ESTABLISHED | |
178 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 179 | -p icmpv6 --icmpv6-type echo-request \ |
78af294c MW |
180 | -m mark --mark $to_untrusted/$MASK_TO |
181 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 182 | -p icmpv6 --icmpv6-type echo-reply \ |
78af294c MW |
183 | -m mark --mark $from_untrusted/$MASK_FROM \ |
184 | -m state --state ESTABLISHED | |
185 | ||
186 | ## Allow SSH from safe/noloop to untrusted networks. | |
187 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
188 | -p tcp --destination-port $port_ssh \ | |
189 | -m mark --mark $to_untrusted/$MASK_TO | |
190 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
191 | -p tcp --source-port $port_ssh \ | |
192 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
193 | -m state --state ESTABLISHED | |
194 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
195 | -p tcp --destination-port $port_ssh \ | |
196 | -m mark --mark $to_untrusted/$MASK_TO | |
197 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
198 | -p tcp --source-port $port_ssh \ | |
199 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
200 | -m state --state ESTABLISHED | |
201 | ||
202 | ;; | |
203 | esac | |
204 | ||
a4d8cae3 | 205 | m4_divert(80)m4_dnl |
ade2c052 MW |
206 | ###-------------------------------------------------------------------------- |
207 | ### Kill things we don't understand properly. | |
208 | ### | |
209 | ### I don't like having to do this, but since I don't know how to do proper | |
210 | ### multicast filtering, I'm just going to ban it from being forwarded. | |
211 | ||
212 | errorchain poorly-understood REJECT | |
213 | ||
214 | ## Ban multicast destination addresses in forwarding. | |
78af294c MW |
215 | case $forward in |
216 | 1) | |
217 | run iptables -A FORWARD -g poorly-understood \ | |
218 | -d 224.0.0.0/4 | |
219 | run ip6tables -A FORWARD -g poorly-understood \ | |
220 | -d ff::/8 | |
221 | ;; | |
222 | esac | |
ade2c052 | 223 | |
a4d8cae3 | 224 | m4_divert(84)m4_dnl |
bfdc045d MW |
225 | ###-------------------------------------------------------------------------- |
226 | ### Locally-bound packet inspection. | |
227 | ||
228 | clearchain inbound | |
229 | ||
230 | ## Track connections. | |
ecdca131 | 231 | commonrules inbound |
bfdc045d MW |
232 | conntrack inbound |
233 | ||
234 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
235 | ## local request. | |
236 | run iptables -A inbound -j ACCEPT \ | |
237 | -s 0.0.0.0 -d 255.255.255.255 \ | |
238 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
239 | run iptables -A inbound -j ACCEPT \ | |
240 | -s 172.29.198.0/23 \ | |
241 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
242 | ||
243 | ## Allow incoming ping. This is the only ICMP left. | |
0291d6d5 | 244 | run ip46tables -A inbound -j ACCEPT -p icmp |
bfdc045d MW |
245 | |
246 | m4_divert(88)m4_dnl | |
247 | ## Allow unusual things. | |
248 | openports inbound | |
249 | ||
250 | ## Inspect inbound packets from untrusted sources. | |
0291d6d5 MW |
251 | run ip46tables -A inbound -j forbidden |
252 | run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound | |
bfdc045d MW |
253 | |
254 | ## Otherwise process as indicated by the mark. | |
f0033e07 MW |
255 | for i in $inchains; do |
256 | run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT | |
257 | done | |
bfdc045d MW |
258 | |
259 | m4_divert(-1) | |
260 | ###----- That's all, folks -------------------------------------------------- |