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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 | ||
36e36cc7 MW |
36 | ## IPv4 addressing. |
37 | ## | |
38 | ## There are two small blocks of publicly routable IPv4 addresses, and a | |
39 | ## block of RFC1918 private-use addresses allocated from the Cambridge G-RIN. | |
40 | ## The former are as follows. | |
41 | ## | |
42 | ## 62.49.204.144/28 | |
43 | ## House border network (dmz). We have all of these, but .145 | |
44 | ## is reserved for the router. | |
45 | ## | |
46 | ## 212.13.18.64/28 | |
47 | ## Jump colocated network (jump). .65--68 are used by Jump | |
48 | ## network infrastructure; we get the rest. | |
49 | ## | |
50 | ## The latter is the block 172.29.196.0/22. Currently the low half is | |
51 | ## unallocated (and may be returned to the G-RIN); the remaining addresses | |
52 | ## are allocated as follows. | |
53 | ## | |
54 | ## 172.29.198.0/24 Untrusted networks. | |
55 | ## .0/25 house wireless net | |
56 | ## .128/28 iodine (IP-over-DNS) network | |
57 | ## | |
58 | ## 172.29.199.0/24 Trusted networks. | |
59 | ## .0/25 house wired network | |
60 | ## .128/27 mobile VPN hosts | |
61 | ## .160/28 reserved, except .160/30 allocated for ITS | |
62 | ## .176/28 internal colocated network | |
63 | ## .192/27 house safe network | |
64 | ## .224/27 anycast services | |
65 | ||
66 | ## IPv6 addressing. | |
67 | ## | |
68 | ## There are five blocks of publicly routable IPv6 addresses, though some of | |
69 | ## them aren't very interesting. The ranges are as follows. | |
70 | ## | |
71 | ## 2001:470:1f08:1b98::/64 | |
72 | ## Hurricane Electric tunnel network: only :1 (HE) and :2 | |
73 | ## (radius) are used. | |
74 | ## | |
75 | ## 2001:470:1f09:1b98::/64 | |
76 | ## House border network (dmz). | |
77 | ## | |
78 | ## 2001:470:9740::/48 | |
79 | ## Main house range. See below for allocation policy. | |
80 | ## | |
81 | ## 2001:ba8:0:1d9::/64 | |
82 | ## Jump border network (jump): :1 is the router (supplied by | |
83 | ## Jump); other addresses are ours. | |
84 | ## | |
85 | ## 2001:ba8:1d9::/48 | |
86 | ## Main colocated range. See below for allocation policy. | |
87 | ## | |
88 | ## Addresses in the /64 networks are simply allocated in ascending order. | |
89 | ## The /48s are split into /64s by appending a 16-bit network number. The | |
90 | ## top nibble of the network number classifies the network, as follows. | |
91 | ## | |
92 | ## 8xxx Untrusted | |
93 | ## 6xxx Virtual | |
94 | ## 4xxx Safe | |
95 | ## 0xxx Unsafe, trusted | |
96 | ## | |
97 | ## These have been chosen so that network properties can be deduced by | |
98 | ## inspecting bits of the network number: | |
99 | ## | |
100 | ## Bit 15 If set, the network is untrusted; otherwise it is trusted. | |
101 | ## Bit 14 If set, the network is safe; otherwise it is unsafe. | |
102 | ## | |
103 | ## Finally, the low-order nibbles identify the site. | |
104 | ## | |
105 | ## 0 No specific site: mobile VPN endpoints or anycast addresses. | |
106 | ## 1 House. | |
107 | ## 2 Jump colocation. | |
108 | ## | |
109 | ## Usually site-0 networks are allocated from the Jump range to improve | |
110 | ## expected performance from/to external sites which don't engage in our | |
111 | ## dynamic routing protocols. | |
112 | ||
bfdc045d MW |
113 | ## Define the available network classes. |
114 | m4_divert(42)m4_dnl | |
44f95827 MW |
115 | defnetclass untrusted untrusted trusted mcast |
116 | defnetclass trusted untrusted trusted safe noloop mcast | |
117 | defnetclass safe trusted safe noloop mcast | |
118 | defnetclass noloop trusted safe mcast | |
119 | defnetclass link | |
120 | defnetclass mcast | |
a4d8cae3 | 121 | m4_divert(-1) |
bfdc045d | 122 | |
a4d8cae3 | 123 | m4_divert(26)m4_dnl |
bfdc045d MW |
124 | ###-------------------------------------------------------------------------- |
125 | ### Network layout. | |
126 | ||
beb4f0ee MW |
127 | ## House networks. |
128 | defnet dmz trusted | |
b9e891b5 | 129 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
beb4f0ee MW |
130 | forwards unsafe untrusted |
131 | defnet unsafe trusted | |
b9e891b5 | 132 | addr 172.29.199.0/25 2001:470:9740:1::/64 |
beb4f0ee MW |
133 | forwards househub |
134 | defnet safe safe | |
216285e1 | 135 | addr 172.29.199.192/27 2001:470:9740:4001::/64 |
beb4f0ee MW |
136 | forwards househub |
137 | defnet untrusted untrusted | |
b9e891b5 | 138 | addr 172.29.198.0/25 2001:470:9740:8001::/64 |
beb4f0ee | 139 | forwards househub |
bfdc045d | 140 | |
beb4f0ee MW |
141 | defnet househub virtual |
142 | forwards housebdry dmz unsafe safe untrusted | |
143 | defnet housebdry virtual | |
144 | forwards househub hub | |
145 | noxit dmz | |
146 | ||
147 | ## House hosts. | |
148 | defhost radius | |
4eb9f4df | 149 | hosttype router |
68f0829f MW |
150 | iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default |
151 | iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default | |
960a9996 | 152 | iface eth2 dmz unsafe safe untrusted vpn sgo colobdry |
68f0829f | 153 | iface eth3 untrusted vpn default |
8506ff83 | 154 | iface ppp0 default |
a7e48c06 | 155 | iface t6-he default |
68f0829f MW |
156 | iface vpn-precision colobdry vpn sgo |
157 | iface vpn-chiark sgo | |
158 | iface vpn-+ vpn | |
beb4f0ee | 159 | defhost roadstar |
ce6434f7 MW |
160 | iface eth0 dmz unsafe |
161 | iface eth1 dmz unsafe | |
beb4f0ee | 162 | defhost jem |
ce6434f7 MW |
163 | iface eth0 dmz unsafe |
164 | iface eth1 dmz unsafe | |
beb4f0ee | 165 | defhost artist |
564c6939 | 166 | hosttype router |
490003e4 MW |
167 | iface eth0 dmz unsafe untrusted |
168 | iface eth1 dmz unsafe untrusted | |
564c6939 | 169 | iface eth3 untrusted |
beb4f0ee | 170 | defhost vampire |
4eb9f4df | 171 | hosttype router |
2b17ac87 MW |
172 | iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry |
173 | iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry | |
174 | iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry | |
175 | iface eth0.7 untrusted | |
68f0829f | 176 | iface vpn-precision colobdry vpn sgo |
ebaa31a7 MW |
177 | iface vpn-chiark sgo |
178 | iface vpn-+ vpn | |
beb4f0ee | 179 | defhost ibanez |
06ff8082 | 180 | iface br-dmz dmz unsafe |
beb4f0ee MW |
181 | iface br-unsafe unsafe |
182 | ||
183 | defhost gibson | |
4eb9f4df | 184 | hosttype client |
beb4f0ee MW |
185 | iface eth0 unsafe |
186 | ||
187 | ## Colocated networks. | |
188 | defnet jump trusted | |
b9e891b5 | 189 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 |
beb4f0ee MW |
190 | forwards colohub |
191 | defnet colo trusted | |
b9e891b5 | 192 | addr 172.29.199.176/28 2001:ba8:1d9:2::/64 |
beb4f0ee MW |
193 | forwards colohub |
194 | defnet colohub virtual | |
148d527c | 195 | forwards colobdry jump colo iodine |
beb4f0ee MW |
196 | defnet colobdry virtual |
197 | forwards colohub hub | |
198 | noxit jump | |
148d527c MW |
199 | defnet iodine untrusted |
200 | addr 172.29.198.128/28 | |
201 | forwards colohub | |
beb4f0ee MW |
202 | |
203 | ## Colocated hosts. | |
204 | defhost fender | |
ce6434f7 MW |
205 | iface br-jump jump colo |
206 | iface br-colo jump colo | |
beb4f0ee | 207 | defhost precision |
4eb9f4df | 208 | hosttype router |
560ae309 MW |
209 | iface eth0 jump colo vpn sgo |
210 | iface eth1 jump colo vpn sgo | |
68f0829f | 211 | iface vpn-radius housebdry vpn sgo |
ebaa31a7 MW |
212 | iface vpn-chiark sgo |
213 | iface vpn-+ vpn | |
beb4f0ee | 214 | defhost telecaster |
ce6434f7 MW |
215 | iface eth0 jump colo |
216 | iface eth1 jump colo | |
beb4f0ee | 217 | defhost stratocaster |
ce6434f7 MW |
218 | iface eth0 jump colo |
219 | iface eth1 jump colo | |
beb4f0ee | 220 | defhost jazz |
560ae309 MW |
221 | hosttype router |
222 | iface eth0 jump colo vpn | |
223 | iface eth1 jump colo vpn | |
148d527c | 224 | iface dns0 iodine |
560ae309 | 225 | iface vpn-+ vpn |
beb4f0ee MW |
226 | |
227 | ## Other networks. | |
228 | defnet hub virtual | |
229 | forwards housebdry colobdry | |
ebaa31a7 MW |
230 | defnet sgo noloop |
231 | addr !172.29.198.0/23 | |
232 | addr 10.0.0.0/8 | |
233 | addr 172.16.0.0/12 | |
234 | addr 192.168.0.0/16 | |
235 | forwards househub colohub | |
7dff2754 MW |
236 | defnet vpn safe |
237 | addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 | |
238 | forwards househub colohub | |
239 | host crybaby 1 | |
240 | host terror 2 | |
c68b8ecc MW |
241 | defnet anycast trusted |
242 | addr 172.29.199.224/27 2001:ba8:1d9:0::/64 | |
243 | forwards dmz unsafe safe untrusted jump colo vpn | |
beb4f0ee | 244 | defnet default untrusted |
b9e891b5 MW |
245 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
246 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 | |
247 | addr 2001:ba8:1d9::/48 #temporary | |
793937d8 | 248 | forwards dmz unsafe untrusted jump colo |
1ee6211d | 249 | |
a4d8cae3 | 250 | m4_divert(80)m4_dnl |
bfdc045d MW |
251 | ###-------------------------------------------------------------------------- |
252 | ### Special forwarding exemptions. | |
253 | ||
78af294c MW |
254 | case $forward in |
255 | 1) | |
256 | ||
257 | ## Only allow these packets if they're not fragmented. (Don't trust safe | |
258 | ## hosts's fragment reassembly to be robust against malicious fragments.) | |
259 | ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning | |
260 | ## of `! -f', so we do the negation using early return from a subchain. | |
261 | clearchain fwd-spec-nofrag | |
262 | run iptables -A fwd-spec-nofrag -j RETURN --fragment | |
263 | run ip6tables -A fwd-spec-nofrag -j RETURN \ | |
264 | -m ipv6header --soft --header frag | |
87bf1592 | 265 | run ip46tables -A FORWARD -j fwd-spec-nofrag |
78af294c MW |
266 | |
267 | ## Allow ping from safe/noloop to untrusted networks. | |
268 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
269 | -p icmp --icmp-type echo-request \ | |
270 | -m mark --mark $to_untrusted/$MASK_TO | |
271 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
272 | -p icmp --icmp-type echo-reply \ | |
273 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
274 | -m state --state ESTABLISHED | |
275 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 276 | -p icmpv6 --icmpv6-type echo-request \ |
78af294c MW |
277 | -m mark --mark $to_untrusted/$MASK_TO |
278 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 279 | -p icmpv6 --icmpv6-type echo-reply \ |
78af294c MW |
280 | -m mark --mark $from_untrusted/$MASK_FROM \ |
281 | -m state --state ESTABLISHED | |
282 | ||
283 | ## Allow SSH from safe/noloop to untrusted networks. | |
cbbd5e39 | 284 | run ip46tables -A fwd-spec-nofrag -j ACCEPT \ |
78af294c MW |
285 | -p tcp --destination-port $port_ssh \ |
286 | -m mark --mark $to_untrusted/$MASK_TO | |
cbbd5e39 | 287 | run ip46tables -A fwd-spec-nofrag -j ACCEPT \ |
78af294c MW |
288 | -p tcp --source-port $port_ssh \ |
289 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
290 | -m state --state ESTABLISHED | |
291 | ||
292 | ;; | |
293 | esac | |
294 | ||
a4d8cae3 | 295 | m4_divert(80)m4_dnl |
ade2c052 MW |
296 | ###-------------------------------------------------------------------------- |
297 | ### Kill things we don't understand properly. | |
298 | ### | |
299 | ### I don't like having to do this, but since I don't know how to do proper | |
300 | ### multicast filtering, I'm just going to ban it from being forwarded. | |
301 | ||
302 | errorchain poorly-understood REJECT | |
303 | ||
304 | ## Ban multicast destination addresses in forwarding. | |
78af294c MW |
305 | case $forward in |
306 | 1) | |
307 | run iptables -A FORWARD -g poorly-understood \ | |
308 | -d 224.0.0.0/4 | |
309 | run ip6tables -A FORWARD -g poorly-understood \ | |
310 | -d ff::/8 | |
311 | ;; | |
312 | esac | |
ade2c052 | 313 | |
a4d8cae3 | 314 | m4_divert(84)m4_dnl |
bfdc045d MW |
315 | ###-------------------------------------------------------------------------- |
316 | ### Locally-bound packet inspection. | |
317 | ||
318 | clearchain inbound | |
319 | ||
320 | ## Track connections. | |
ecdca131 | 321 | commonrules inbound |
bfdc045d MW |
322 | conntrack inbound |
323 | ||
324 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
325 | ## local request. | |
326 | run iptables -A inbound -j ACCEPT \ | |
327 | -s 0.0.0.0 -d 255.255.255.255 \ | |
328 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
329 | run iptables -A inbound -j ACCEPT \ | |
330 | -s 172.29.198.0/23 \ | |
331 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
332 | ||
333 | ## Allow incoming ping. This is the only ICMP left. | |
0291d6d5 | 334 | run ip46tables -A inbound -j ACCEPT -p icmp |
bfdc045d MW |
335 | |
336 | m4_divert(88)m4_dnl | |
337 | ## Allow unusual things. | |
338 | openports inbound | |
339 | ||
340 | ## Inspect inbound packets from untrusted sources. | |
0291d6d5 MW |
341 | run ip46tables -A inbound -j forbidden |
342 | run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound | |
bfdc045d MW |
343 | |
344 | ## Otherwise process as indicated by the mark. | |
f0033e07 MW |
345 | for i in $inchains; do |
346 | run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT | |
347 | done | |
bfdc045d MW |
348 | |
349 | m4_divert(-1) | |
350 | ###----- That's all, folks -------------------------------------------------- |