Commit | Line | Data |
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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 | ||
335b2afe MW |
24 | ###-------------------------------------------------------------------------- |
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) | |
bfdc045d MW |
33 | ###-------------------------------------------------------------------------- |
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 | ## | |
f01cdc79 | 42 | ## 81.2.113.195, 81.187.238.128/28 |
295959ea MW |
43 | ## House border network (dmz). We have all of these; the loose |
44 | ## address is for the router. | |
f01cdc79 | 45 | ## |
36e36cc7 MW |
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 | |
d0409c90 | 57 | ## .144/28 hippotat (IP-over-HTTP) network |
42f784e2 | 58 | ## .160/27 untrusted virtual network |
36e36cc7 MW |
59 | ## |
60 | ## 172.29.199.0/24 Trusted networks. | |
61 | ## .0/25 house wired network | |
62 | ## .128/27 mobile VPN hosts | |
63 | ## .160/28 reserved, except .160/30 allocated for ITS | |
64 | ## .176/28 internal colocated network | |
65 | ## .192/27 house safe network | |
66 | ## .224/27 anycast services | |
67 | ||
68 | ## IPv6 addressing. | |
69 | ## | |
70 | ## There are five blocks of publicly routable IPv6 addresses, though some of | |
71 | ## them aren't very interesting. The ranges are as follows. | |
72 | ## | |
f01cdc79 MW |
73 | ## 2001:8b0:c92::/48 |
74 | ## Main house range (aaisp). See below for allocation policy. | |
75 | ## There is no explicit DMZ allocation (and no need for one). | |
76 | ## | |
36e36cc7 MW |
77 | ## 2001:ba8:0:1d9::/64 |
78 | ## Jump border network (jump): :1 is the router (supplied by | |
79 | ## Jump); other addresses are ours. | |
80 | ## | |
81 | ## 2001:ba8:1d9::/48 | |
82 | ## Main colocated range. See below for allocation policy. | |
83 | ## | |
84 | ## Addresses in the /64 networks are simply allocated in ascending order. | |
85 | ## The /48s are split into /64s by appending a 16-bit network number. The | |
86 | ## top nibble of the network number classifies the network, as follows. | |
87 | ## | |
42f784e2 | 88 | ## axxx Virtual, untrusted |
36e36cc7 | 89 | ## 8xxx Untrusted |
2caaca79 | 90 | ## 6xxx Virtual, safe |
36e36cc7 MW |
91 | ## 4xxx Safe |
92 | ## 0xxx Unsafe, trusted | |
93 | ## | |
94 | ## These have been chosen so that network properties can be deduced by | |
95 | ## inspecting bits of the network number: | |
96 | ## | |
97 | ## Bit 15 If set, the network is untrusted; otherwise it is trusted. | |
98 | ## Bit 14 If set, the network is safe; otherwise it is unsafe. | |
99 | ## | |
100 | ## Finally, the low-order nibbles identify the site. | |
101 | ## | |
102 | ## 0 No specific site: mobile VPN endpoints or anycast addresses. | |
103 | ## 1 House. | |
104 | ## 2 Jump colocation. | |
295959ea | 105 | ## fff Local border network. |
36e36cc7 MW |
106 | ## |
107 | ## Usually site-0 networks are allocated from the Jump range to improve | |
108 | ## expected performance from/to external sites which don't engage in our | |
109 | ## dynamic routing protocols. | |
110 | ||
bfdc045d MW |
111 | ## Define the available network classes. |
112 | m4_divert(42)m4_dnl | |
8670c87d | 113 | defnetclass scary scary trusted mcast |
1b534b6a MW |
114 | defnetclass untrusted scary untrusted trusted mcast |
115 | defnetclass trusted scary untrusted trusted safe noloop mcast | |
116 | defnetclass safe trusted safe noloop mcast | |
117 | defnetclass noloop trusted safe mcast | |
951e7943 | 118 | |
44f95827 MW |
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 | |
295959ea | 129 | addr 81.2.113.195 81.187.238.128/28 2001:8b0:c92:fff::/64 |
17a45245 | 130 | via unsafe untrusted |
beb4f0ee | 131 | defnet unsafe trusted |
295959ea | 132 | addr 172.29.199.0/25 2001:8b0:c92:1::/64 |
17a45245 | 133 | via househub |
beb4f0ee | 134 | defnet safe safe |
295959ea | 135 | addr 172.29.199.192/27 2001:8b0:c92:4001::/64 |
17a45245 | 136 | via househub |
beb4f0ee | 137 | defnet untrusted untrusted |
295959ea | 138 | addr 172.29.198.0/25 2001:8b0:c92:8001::/64 |
17a45245 | 139 | via househub |
bfdc045d | 140 | |
beb4f0ee | 141 | defnet househub virtual |
17a45245 | 142 | via housebdry dmz unsafe safe untrusted |
beb4f0ee | 143 | defnet housebdry virtual |
17a45245 | 144 | via househub hub |
beb4f0ee MW |
145 | |
146 | ## House hosts. | |
147 | defhost radius | |
4eb9f4df | 148 | hosttype router |
68f0829f MW |
149 | iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default |
150 | iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default | |
960a9996 | 151 | iface eth2 dmz unsafe safe untrusted vpn sgo colobdry |
83cc1e6c | 152 | iface eth3 unsafe untrusted vpn default |
8506ff83 | 153 | iface ppp0 default |
a7e48c06 | 154 | iface t6-he default |
68f0829f MW |
155 | iface vpn-precision colobdry vpn sgo |
156 | iface vpn-chiark sgo | |
157 | iface vpn-+ vpn | |
beb4f0ee | 158 | defhost roadstar |
ce6434f7 MW |
159 | iface eth0 dmz unsafe |
160 | iface eth1 dmz unsafe | |
beb4f0ee | 161 | defhost jem |
ce6434f7 MW |
162 | iface eth0 dmz unsafe |
163 | iface eth1 dmz unsafe | |
97320b7d MW |
164 | defhost universe |
165 | iface eth0 dmz unsafe | |
166 | iface eth1 dmz unsafe | |
beb4f0ee | 167 | defhost artist |
564c6939 | 168 | hosttype router |
490003e4 MW |
169 | iface eth0 dmz unsafe untrusted |
170 | iface eth1 dmz unsafe untrusted | |
83cc1e6c | 171 | iface eth3 unsafe untrusted |
beb4f0ee | 172 | defhost vampire |
4eb9f4df | 173 | hosttype router |
2b17ac87 MW |
174 | iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry |
175 | iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry | |
176 | iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry | |
83cc1e6c | 177 | iface eth0.7 unsafe untrusted vpn |
68f0829f | 178 | iface vpn-precision colobdry vpn sgo |
ebaa31a7 MW |
179 | iface vpn-chiark sgo |
180 | iface vpn-+ vpn | |
beb4f0ee | 181 | defhost ibanez |
06ff8082 | 182 | iface br-dmz dmz unsafe |
beb4f0ee | 183 | iface br-unsafe unsafe |
6fd217ae MW |
184 | defhost orange |
185 | iface wlan0 untrusted | |
186 | iface vpn-radius unsafe | |
49b81a66 MW |
187 | defhost groove |
188 | iface eth0 unsafe | |
24ddb007 MW |
189 | iface wlan0 untrusted |
190 | iface vpn-radius unsafe | |
beb4f0ee MW |
191 | |
192 | defhost gibson | |
4eb9f4df | 193 | hosttype client |
d8e50664 | 194 | iface eth0 unsafe |
beb4f0ee MW |
195 | |
196 | ## Colocated networks. | |
197 | defnet jump trusted | |
b9e891b5 | 198 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 |
17a45245 | 199 | via colohub |
beb4f0ee | 200 | defnet colo trusted |
b9e891b5 | 201 | addr 172.29.199.176/28 2001:ba8:1d9:2::/64 |
17a45245 | 202 | via colohub |
beb4f0ee | 203 | defnet colohub virtual |
9853a66d | 204 | via colobdry jump colo |
beb4f0ee | 205 | defnet colobdry virtual |
17a45245 | 206 | via colohub hub |
148d527c MW |
207 | defnet iodine untrusted |
208 | addr 172.29.198.128/28 | |
17a45245 | 209 | via colohub |
d0409c90 MW |
210 | defnet hippotat untrusted |
211 | addr 172.29.198.144/28 | |
212 | via colohub | |
beb4f0ee MW |
213 | |
214 | ## Colocated hosts. | |
215 | defhost fender | |
ce6434f7 MW |
216 | iface br-jump jump colo |
217 | iface br-colo jump colo | |
beb4f0ee | 218 | defhost precision |
4eb9f4df | 219 | hosttype router |
560ae309 MW |
220 | iface eth0 jump colo vpn sgo |
221 | iface eth1 jump colo vpn sgo | |
1fd9cef9 | 222 | iface vpn-mango binswood |
68f0829f | 223 | iface vpn-radius housebdry vpn sgo |
ebaa31a7 | 224 | iface vpn-chiark sgo |
38e85ca3 | 225 | iface vpn-national upn |
ebaa31a7 | 226 | iface vpn-+ vpn |
beb4f0ee | 227 | defhost telecaster |
ce6434f7 MW |
228 | iface eth0 jump colo |
229 | iface eth1 jump colo | |
beb4f0ee | 230 | defhost stratocaster |
ce6434f7 MW |
231 | iface eth0 jump colo |
232 | iface eth1 jump colo | |
beb4f0ee | 233 | defhost jazz |
560ae309 MW |
234 | hosttype router |
235 | iface eth0 jump colo vpn | |
236 | iface eth1 jump colo vpn | |
148d527c | 237 | iface dns0 iodine |
d0409c90 | 238 | iface hippo-svc hippotat |
560ae309 | 239 | iface vpn-+ vpn |
beb4f0ee MW |
240 | |
241 | ## Other networks. | |
242 | defnet hub virtual | |
17a45245 | 243 | via housebdry colobdry |
ebaa31a7 MW |
244 | defnet sgo noloop |
245 | addr !172.29.198.0/23 | |
246 | addr 10.0.0.0/8 | |
247 | addr 172.16.0.0/12 | |
248 | addr 192.168.0.0/16 | |
17a45245 | 249 | via househub colohub |
57644f26 | 250 | defnet vpn trusted |
7dff2754 | 251 | addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 |
17a45245 | 252 | via househub colohub |
eec061c0 MW |
253 | host crybaby 1 ::1:1 |
254 | host terror 2 ::2:1 | |
255 | host orange 3 ::3:1 | |
a28edce0 | 256 | host haze 4 ::4:1 |
24ddb007 | 257 | host groove 5 ::5:1 |
c68b8ecc MW |
258 | defnet anycast trusted |
259 | addr 172.29.199.224/27 2001:ba8:1d9:0::/64 | |
17a45245 | 260 | via dmz unsafe safe untrusted jump colo vpn |
1b534b6a | 261 | defnet default scary |
295959ea | 262 | addr 81.2.113.195 81.187.238.128/28 2001:8b0:c92::/48 |
b9e891b5 MW |
263 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 |
264 | addr 2001:ba8:1d9::/48 #temporary | |
17a45245 | 265 | via dmz unsafe untrusted jump colo |
42f784e2 MW |
266 | defnet upn untrusted |
267 | addr 172.29.198.160/27 2001:ba8:1d9:a000::/64 | |
268 | via colohub | |
38e85ca3 MW |
269 | host national 1 ::1:1 |
270 | ||
271 | ## Linode hosts. | |
272 | defhost national | |
273 | iface eth0 default | |
274 | iface vpn-precision colohub | |
1ee6211d | 275 | |
1fd9cef9 MW |
276 | ## Satellite networks. |
277 | defnet binswood noloop | |
278 | addr 10.165.27.0/24 | |
279 | via colohub | |
31c0a107 MW |
280 | defhost mango |
281 | hosttype router | |
282 | iface eth0 binswood default | |
283 | iface vpn-precision colo | |
284 | ||
5c5fcd73 MW |
285 | m4_divert(80)m4_dnl |
286 | ###-------------------------------------------------------------------------- | |
287 | ### Connection tracking helper modules. | |
288 | ||
289 | for i in ftp; do | |
290 | modprobe nf_conntrack_$i | |
291 | done | |
292 | ||
a4d8cae3 | 293 | m4_divert(80)m4_dnl |
bfdc045d MW |
294 | ###-------------------------------------------------------------------------- |
295 | ### Special forwarding exemptions. | |
296 | ||
78af294c MW |
297 | case $forward in |
298 | 1) | |
299 | ||
300 | ## Only allow these packets if they're not fragmented. (Don't trust safe | |
301 | ## hosts's fragment reassembly to be robust against malicious fragments.) | |
302 | ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning | |
303 | ## of `! -f', so we do the negation using early return from a subchain. | |
304 | clearchain fwd-spec-nofrag | |
305 | run iptables -A fwd-spec-nofrag -j RETURN --fragment | |
306 | run ip6tables -A fwd-spec-nofrag -j RETURN \ | |
307 | -m ipv6header --soft --header frag | |
87bf1592 | 308 | run ip46tables -A FORWARD -j fwd-spec-nofrag |
78af294c MW |
309 | |
310 | ## Allow ping from safe/noloop to untrusted networks. | |
311 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
312 | -p icmp --icmp-type echo-request \ | |
313 | -m mark --mark $to_untrusted/$MASK_TO | |
314 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
315 | -p icmp --icmp-type echo-reply \ | |
316 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
317 | -m state --state ESTABLISHED | |
318 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 319 | -p icmpv6 --icmpv6-type echo-request \ |
78af294c MW |
320 | -m mark --mark $to_untrusted/$MASK_TO |
321 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 322 | -p icmpv6 --icmpv6-type echo-reply \ |
78af294c MW |
323 | -m mark --mark $from_untrusted/$MASK_FROM \ |
324 | -m state --state ESTABLISHED | |
325 | ||
326 | ## Allow SSH from safe/noloop to untrusted networks. | |
cbbd5e39 | 327 | run ip46tables -A fwd-spec-nofrag -j ACCEPT \ |
78af294c MW |
328 | -p tcp --destination-port $port_ssh \ |
329 | -m mark --mark $to_untrusted/$MASK_TO | |
cbbd5e39 | 330 | run ip46tables -A fwd-spec-nofrag -j ACCEPT \ |
78af294c MW |
331 | -p tcp --source-port $port_ssh \ |
332 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
333 | -m state --state ESTABLISHED | |
334 | ||
335 | ;; | |
336 | esac | |
337 | ||
a4d8cae3 | 338 | m4_divert(80)m4_dnl |
ade2c052 MW |
339 | ###-------------------------------------------------------------------------- |
340 | ### Kill things we don't understand properly. | |
341 | ### | |
342 | ### I don't like having to do this, but since I don't know how to do proper | |
343 | ### multicast filtering, I'm just going to ban it from being forwarded. | |
344 | ||
345 | errorchain poorly-understood REJECT | |
346 | ||
347 | ## Ban multicast destination addresses in forwarding. | |
78af294c MW |
348 | case $forward in |
349 | 1) | |
350 | run iptables -A FORWARD -g poorly-understood \ | |
351 | -d 224.0.0.0/4 | |
352 | run ip6tables -A FORWARD -g poorly-understood \ | |
353 | -d ff::/8 | |
354 | ;; | |
355 | esac | |
ade2c052 | 356 | |
7377aca7 MW |
357 | m4_divert(82)m4_dnl |
358 | ###-------------------------------------------------------------------------- | |
359 | ### Check for source routing. | |
360 | ||
361 | clearchain check-srcroute | |
362 | ||
363 | run iptables -A check-srcroute -g forbidden \ | |
364 | -m ipv4options --any --flags lsrr,ssrr | |
365 | run ip6tables -A check-srcroute -g forbidden \ | |
366 | -m rt | |
367 | ||
368 | for c in INPUT FORWARD; do | |
369 | for m in $from_scary $from_untrusted; do | |
370 | run ip46tables -A $c -m mark --mark $m/$MASK_FROM -j check-srcroute | |
371 | done | |
372 | done | |
373 | ||
a4d8cae3 | 374 | m4_divert(84)m4_dnl |
bfdc045d MW |
375 | ###-------------------------------------------------------------------------- |
376 | ### Locally-bound packet inspection. | |
377 | ||
378 | clearchain inbound | |
379 | ||
380 | ## Track connections. | |
ecdca131 | 381 | commonrules inbound |
bfdc045d MW |
382 | conntrack inbound |
383 | ||
384 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
385 | ## local request. | |
386 | run iptables -A inbound -j ACCEPT \ | |
387 | -s 0.0.0.0 -d 255.255.255.255 \ | |
388 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
389 | run iptables -A inbound -j ACCEPT \ | |
390 | -s 172.29.198.0/23 \ | |
391 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
392 | ||
393 | ## Allow incoming ping. This is the only ICMP left. | |
8bd7e0fe MW |
394 | run iptables -A inbound -j ACCEPT -p icmp |
395 | run ip6tables -A inbound -j ACCEPT -p icmpv6 | |
bfdc045d MW |
396 | |
397 | m4_divert(88)m4_dnl | |
398 | ## Allow unusual things. | |
399 | openports inbound | |
400 | ||
401 | ## Inspect inbound packets from untrusted sources. | |
994ac8d0 | 402 | run ip46tables -A inbound -g forbidden |
4f8c1989 | 403 | run ip46tables -A INPUT -m mark --mark $from_scary/$MASK_FROM -g inbound |
0291d6d5 | 404 | run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound |
bfdc045d | 405 | |
1b534b6a | 406 | ## Allow responses from the scary outside world into the untrusted net, but |
43e20546 | 407 | ## don't let untrusted things run services. |
1b534b6a MW |
408 | case $forward in |
409 | 1) | |
410 | run ip46tables -A FORWARD -j ACCEPT \ | |
411 | -m mark --mark $(( $from_scary | $to_untrusted ))/$(( $MASK_FROM | $MASK_TO )) \ | |
412 | -m state --state ESTABLISHED,RELATED | |
413 | ;; | |
414 | esac | |
415 | ||
bfdc045d | 416 | ## Otherwise process as indicated by the mark. |
f0033e07 MW |
417 | for i in $inchains; do |
418 | run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT | |
419 | done | |
bfdc045d MW |
420 | |
421 | m4_divert(-1) | |
422 | ###----- That's all, folks -------------------------------------------------- |