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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 | 62 | forwards househub |
beb4f0ee MW |
63 | defnet iodine untrusted |
64 | addr 172.29.198.128/28 | |
bfdc045d | 65 | |
beb4f0ee MW |
66 | defnet househub virtual |
67 | forwards housebdry dmz unsafe safe untrusted | |
68 | defnet housebdry virtual | |
69 | forwards househub hub | |
70 | noxit dmz | |
71 | ||
72 | ## House hosts. | |
73 | defhost radius | |
4eb9f4df | 74 | hosttype router |
c353339c MW |
75 | iface eth0 dmz unsafe safe untrusted default |
76 | iface eth1 dmz unsafe safe untrusted default | |
beb4f0ee | 77 | iface eth2 safe |
a7e48c06 MW |
78 | iface eth3 untrusted default |
79 | iface t6-he default | |
beb4f0ee | 80 | defhost roadstar |
ce6434f7 MW |
81 | iface eth0 dmz unsafe |
82 | iface eth1 dmz unsafe | |
beb4f0ee | 83 | defhost jem |
ce6434f7 MW |
84 | iface eth0 dmz unsafe |
85 | iface eth1 dmz unsafe | |
beb4f0ee | 86 | defhost artist |
564c6939 | 87 | hosttype router |
ce6434f7 MW |
88 | iface eth0 dmz unsafe |
89 | iface eth1 dmz unsafe | |
564c6939 | 90 | iface eth3 untrusted |
beb4f0ee | 91 | defhost vampire |
4eb9f4df | 92 | hosttype router |
c353339c MW |
93 | iface eth0.0 dmz unsafe untrusted safe |
94 | iface eth0.1 dmz unsafe untrusted safe | |
e66833d3 | 95 | iface eth0.2 safe |
beb4f0ee | 96 | iface eth0.3 untrusted |
ebaa31a7 | 97 | iface dns0 iodine |
beb4f0ee | 98 | iface vpn-precision colobdry vpn |
ebaa31a7 MW |
99 | iface vpn-chiark sgo |
100 | iface vpn-+ vpn | |
beb4f0ee | 101 | defhost ibanez |
06ff8082 | 102 | iface br-dmz dmz unsafe |
beb4f0ee MW |
103 | iface br-unsafe unsafe |
104 | ||
105 | defhost gibson | |
4eb9f4df | 106 | hosttype client |
beb4f0ee MW |
107 | iface eth0 unsafe |
108 | ||
109 | ## Colocated networks. | |
110 | defnet jump trusted | |
b9e891b5 | 111 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 |
beb4f0ee MW |
112 | forwards colohub |
113 | defnet colo trusted | |
b9e891b5 | 114 | addr 172.29.199.176/28 2001:ba8:1d9:2::/64 |
beb4f0ee MW |
115 | forwards colohub |
116 | defnet colohub virtual | |
117 | forwards colobdry jump colo | |
118 | defnet colobdry virtual | |
119 | forwards colohub hub | |
120 | noxit jump | |
121 | ||
122 | ## Colocated hosts. | |
123 | defhost fender | |
ce6434f7 MW |
124 | iface br-jump jump colo |
125 | iface br-colo jump colo | |
beb4f0ee | 126 | defhost precision |
4eb9f4df | 127 | hosttype router |
ce6434f7 MW |
128 | iface eth0 jump colo |
129 | iface eth1 jump colo | |
beb4f0ee | 130 | iface vpn-vampire housebdry vpn |
ebaa31a7 MW |
131 | iface vpn-chiark sgo |
132 | iface vpn-+ vpn | |
beb4f0ee | 133 | defhost telecaster |
ce6434f7 MW |
134 | iface eth0 jump colo |
135 | iface eth1 jump colo | |
beb4f0ee | 136 | defhost stratocaster |
ce6434f7 MW |
137 | iface eth0 jump colo |
138 | iface eth1 jump colo | |
beb4f0ee | 139 | defhost jazz |
ce6434f7 MW |
140 | iface eth0 jump colo |
141 | iface eth1 jump colo | |
beb4f0ee MW |
142 | |
143 | ## Other networks. | |
144 | defnet hub virtual | |
145 | forwards housebdry colobdry | |
ebaa31a7 MW |
146 | defnet sgo noloop |
147 | addr !172.29.198.0/23 | |
148 | addr 10.0.0.0/8 | |
149 | addr 172.16.0.0/12 | |
150 | addr 192.168.0.0/16 | |
151 | forwards househub colohub | |
7dff2754 MW |
152 | defnet vpn safe |
153 | addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 | |
154 | forwards househub colohub | |
155 | host crybaby 1 | |
156 | host terror 2 | |
c68b8ecc MW |
157 | defnet anycast trusted |
158 | addr 172.29.199.224/27 2001:ba8:1d9:0::/64 | |
159 | forwards dmz unsafe safe untrusted jump colo vpn | |
beb4f0ee | 160 | defnet default untrusted |
b9e891b5 MW |
161 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
162 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 | |
163 | addr 2001:ba8:1d9::/48 #temporary | |
793937d8 | 164 | forwards dmz unsafe untrusted jump colo |
1ee6211d | 165 | |
a4d8cae3 | 166 | m4_divert(80)m4_dnl |
bfdc045d MW |
167 | ###-------------------------------------------------------------------------- |
168 | ### Special forwarding exemptions. | |
169 | ||
78af294c MW |
170 | case $forward in |
171 | 1) | |
172 | ||
173 | ## Only allow these packets if they're not fragmented. (Don't trust safe | |
174 | ## hosts's fragment reassembly to be robust against malicious fragments.) | |
175 | ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning | |
176 | ## of `! -f', so we do the negation using early return from a subchain. | |
177 | clearchain fwd-spec-nofrag | |
178 | run iptables -A fwd-spec-nofrag -j RETURN --fragment | |
179 | run ip6tables -A fwd-spec-nofrag -j RETURN \ | |
180 | -m ipv6header --soft --header frag | |
87bf1592 | 181 | run ip46tables -A FORWARD -j fwd-spec-nofrag |
78af294c MW |
182 | |
183 | ## Allow ping from safe/noloop to untrusted networks. | |
184 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
185 | -p icmp --icmp-type echo-request \ | |
186 | -m mark --mark $to_untrusted/$MASK_TO | |
187 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
188 | -p icmp --icmp-type echo-reply \ | |
189 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
190 | -m state --state ESTABLISHED | |
191 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 192 | -p icmpv6 --icmpv6-type echo-request \ |
78af294c MW |
193 | -m mark --mark $to_untrusted/$MASK_TO |
194 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 195 | -p icmpv6 --icmpv6-type echo-reply \ |
78af294c MW |
196 | -m mark --mark $from_untrusted/$MASK_FROM \ |
197 | -m state --state ESTABLISHED | |
198 | ||
199 | ## Allow SSH from safe/noloop to untrusted networks. | |
200 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
201 | -p tcp --destination-port $port_ssh \ | |
202 | -m mark --mark $to_untrusted/$MASK_TO | |
203 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
204 | -p tcp --source-port $port_ssh \ | |
205 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
206 | -m state --state ESTABLISHED | |
207 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
208 | -p tcp --destination-port $port_ssh \ | |
209 | -m mark --mark $to_untrusted/$MASK_TO | |
210 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
211 | -p tcp --source-port $port_ssh \ | |
212 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
213 | -m state --state ESTABLISHED | |
214 | ||
215 | ;; | |
216 | esac | |
217 | ||
a4d8cae3 | 218 | m4_divert(80)m4_dnl |
ade2c052 MW |
219 | ###-------------------------------------------------------------------------- |
220 | ### Kill things we don't understand properly. | |
221 | ### | |
222 | ### I don't like having to do this, but since I don't know how to do proper | |
223 | ### multicast filtering, I'm just going to ban it from being forwarded. | |
224 | ||
225 | errorchain poorly-understood REJECT | |
226 | ||
227 | ## Ban multicast destination addresses in forwarding. | |
78af294c MW |
228 | case $forward in |
229 | 1) | |
230 | run iptables -A FORWARD -g poorly-understood \ | |
231 | -d 224.0.0.0/4 | |
232 | run ip6tables -A FORWARD -g poorly-understood \ | |
233 | -d ff::/8 | |
234 | ;; | |
235 | esac | |
ade2c052 | 236 | |
a4d8cae3 | 237 | m4_divert(84)m4_dnl |
bfdc045d MW |
238 | ###-------------------------------------------------------------------------- |
239 | ### Locally-bound packet inspection. | |
240 | ||
241 | clearchain inbound | |
242 | ||
243 | ## Track connections. | |
ecdca131 | 244 | commonrules inbound |
bfdc045d MW |
245 | conntrack inbound |
246 | ||
247 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
248 | ## local request. | |
249 | run iptables -A inbound -j ACCEPT \ | |
250 | -s 0.0.0.0 -d 255.255.255.255 \ | |
251 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
252 | run iptables -A inbound -j ACCEPT \ | |
253 | -s 172.29.198.0/23 \ | |
254 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
255 | ||
256 | ## Allow incoming ping. This is the only ICMP left. | |
0291d6d5 | 257 | run ip46tables -A inbound -j ACCEPT -p icmp |
bfdc045d MW |
258 | |
259 | m4_divert(88)m4_dnl | |
260 | ## Allow unusual things. | |
261 | openports inbound | |
262 | ||
263 | ## Inspect inbound packets from untrusted sources. | |
0291d6d5 MW |
264 | run ip46tables -A inbound -j forbidden |
265 | run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound | |
bfdc045d MW |
266 | |
267 | ## Otherwise process as indicated by the mark. | |
f0033e07 MW |
268 | for i in $inchains; do |
269 | run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT | |
270 | done | |
bfdc045d MW |
271 | |
272 | m4_divert(-1) | |
273 | ###----- That's all, folks -------------------------------------------------- |