3 ### Local firewall configuration
5 ### (c) 2008 Mark Wooding
8 ###----- Licensing notice ---------------------------------------------------
10 ### This program is free software; you can redistribute it and/or modify
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12 ### the Free Software Foundation; either version 2 of the License, or
13 ### (at your option) any later version.
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18 ### GNU General Public License for more details.
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22 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ###--------------------------------------------------------------------------
25 ### Local configuration.
28 ## Default NTP servers.
30 "158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232")
33 ###--------------------------------------------------------------------------
34 ### Packet classification.
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.
43 ## House border network (dmz). We have all of these, but .145
44 ## is reserved for the router.
47 ## Jump colocated network (jump). .65--68 are used by Jump
48 ## network infrastructure; we get the rest.
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.
54 ## 172.29.198.0/24 Untrusted networks.
55 ## .0/25 house wireless net
56 ## .128/28 iodine (IP-over-DNS) network
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
68 ## There are five blocks of publicly routable IPv6 addresses, though some of
69 ## them aren't very interesting. The ranges are as follows.
71 ## 2001:470:1f08:1b98::/64
72 ## Hurricane Electric tunnel network: only :1 (HE) and :2
75 ## 2001:470:1f09:1b98::/64
76 ## House border network (dmz).
79 ## Main house range. See below for allocation policy.
81 ## 2001:ba8:0:1d9::/64
82 ## Jump border network (jump): :1 is the router (supplied by
83 ## Jump); other addresses are ours.
86 ## Main colocated range. See below for allocation policy.
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.
95 ## 0xxx Unsafe, trusted
97 ## These have been chosen so that network properties can be deduced by
98 ## inspecting bits of the network number:
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.
103 ## Finally, the low-order nibbles identify the site.
105 ## 0 No specific site: mobile VPN endpoints or anycast addresses.
107 ## 2 Jump colocation.
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.
113 ## Define the available network classes.
115 defnetclass scary scary trusted mcast
116 defnetclass untrusted scary untrusted trusted mcast
117 defnetclass trusted scary untrusted trusted safe noloop mcast
118 defnetclass safe trusted safe noloop mcast
119 defnetclass noloop trusted safe mcast
126 ###--------------------------------------------------------------------------
131 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
133 defnet unsafe trusted
134 addr 172.29.199.0/25 2001:470:9740:1::/64
137 addr 172.29.199.192/27 2001:470:9740:4001::/64
139 defnet untrusted untrusted
140 addr 172.29.198.0/25 2001:470:9740:8001::/64
143 defnet househub virtual
144 via housebdry dmz unsafe safe untrusted
145 defnet housebdry virtual
151 iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
152 iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
153 iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
154 iface eth3 unsafe untrusted vpn default
157 iface vpn-precision colobdry vpn sgo
161 iface eth0 dmz unsafe
162 iface eth1 dmz unsafe
164 iface eth0 dmz unsafe
165 iface eth1 dmz unsafe
168 iface eth0 dmz unsafe untrusted
169 iface eth1 dmz unsafe untrusted
170 iface eth3 unsafe untrusted
173 iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry
174 iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry
175 iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry
176 iface eth0.7 unsafe untrusted vpn
177 iface vpn-precision colobdry vpn sgo
181 iface br-dmz dmz unsafe
182 iface br-unsafe unsafe
184 iface wlan0 untrusted
185 iface vpn-radius unsafe
188 iface wlan0 untrusted
189 iface vpn-radius unsafe
195 ## Colocated networks.
197 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
200 addr 172.29.199.176/28 2001:ba8:1d9:2::/64
202 defnet colohub virtual
203 via colobdry jump colo
204 defnet colobdry virtual
206 defnet iodine untrusted
207 addr 172.29.198.128/28
212 iface br-jump jump colo
213 iface br-colo jump colo
216 iface eth0 jump colo vpn sgo
217 iface eth1 jump colo vpn sgo
218 iface vpn-mango binswood
219 iface vpn-radius housebdry vpn sgo
232 iface eth0 jump colo vpn
233 iface eth1 jump colo vpn
239 via housebdry colobdry
241 addr !172.29.198.0/23
247 addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
254 defnet anycast trusted
255 addr 172.29.199.224/27 2001:ba8:1d9:0::/64
256 via dmz unsafe safe untrusted jump colo vpn
258 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
259 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
260 addr 2001:ba8:1d9::/48 #temporary
261 via dmz unsafe untrusted jump colo
263 ## Satellite networks.
264 defnet binswood noloop
270 iface eth0 binswood default
271 iface vpn-precision colo
274 ###--------------------------------------------------------------------------
275 ### Connection tracking helper modules.
278 modprobe nf_conntrack_$i
282 ###--------------------------------------------------------------------------
283 ### Special forwarding exemptions.
288 ## Only allow these packets if they're not fragmented. (Don't trust safe
289 ## hosts's fragment reassembly to be robust against malicious fragments.)
290 ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
291 ## of `! -f', so we do the negation using early return from a subchain.
292 clearchain fwd-spec-nofrag
293 run iptables -A fwd-spec-nofrag -j RETURN --fragment
294 run ip6tables -A fwd-spec-nofrag -j RETURN \
295 -m ipv6header --soft --header frag
296 run ip46tables -A FORWARD -j fwd-spec-nofrag
298 ## Allow ping from safe/noloop to untrusted networks.
299 run iptables -A fwd-spec-nofrag -j ACCEPT \
300 -p icmp --icmp-type echo-request \
301 -m mark --mark $to_untrusted/$MASK_TO
302 run iptables -A fwd-spec-nofrag -j ACCEPT \
303 -p icmp --icmp-type echo-reply \
304 -m mark --mark $from_untrusted/$MASK_FROM \
305 -m state --state ESTABLISHED
306 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
307 -p icmpv6 --icmpv6-type echo-request \
308 -m mark --mark $to_untrusted/$MASK_TO
309 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
310 -p icmpv6 --icmpv6-type echo-reply \
311 -m mark --mark $from_untrusted/$MASK_FROM \
312 -m state --state ESTABLISHED
314 ## Allow SSH from safe/noloop to untrusted networks.
315 run ip46tables -A fwd-spec-nofrag -j ACCEPT \
316 -p tcp --destination-port $port_ssh \
317 -m mark --mark $to_untrusted/$MASK_TO
318 run ip46tables -A fwd-spec-nofrag -j ACCEPT \
319 -p tcp --source-port $port_ssh \
320 -m mark --mark $from_untrusted/$MASK_FROM \
321 -m state --state ESTABLISHED
327 ###--------------------------------------------------------------------------
328 ### Kill things we don't understand properly.
330 ### I don't like having to do this, but since I don't know how to do proper
331 ### multicast filtering, I'm just going to ban it from being forwarded.
333 errorchain poorly-understood REJECT
335 ## Ban multicast destination addresses in forwarding.
338 run iptables -A FORWARD -g poorly-understood \
340 run ip6tables -A FORWARD -g poorly-understood \
346 ###--------------------------------------------------------------------------
347 ### Locally-bound packet inspection.
351 ## Track connections.
355 ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
357 run iptables -A inbound -j ACCEPT \
358 -s 0.0.0.0 -d 255.255.255.255 \
359 -p udp --source-port $port_bootpc --destination-port $port_bootps
360 run iptables -A inbound -j ACCEPT \
362 -p udp --source-port $port_bootpc --destination-port $port_bootps
364 ## Allow incoming ping. This is the only ICMP left.
365 run ip46tables -A inbound -j ACCEPT -p icmp
368 ## Allow unusual things.
371 ## Inspect inbound packets from untrusted sources.
372 run ip46tables -A inbound -j forbidden
373 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
375 ## Allow responses from the scary outside world into the untrusted net, but
376 ## don't let untrusted things run services.
379 run ip46tables -A FORWARD -j ACCEPT \
380 -m mark --mark $(( $from_scary | $to_untrusted ))/$(( $MASK_FROM | $MASK_TO )) \
381 -m state --state ESTABLISHED,RELATED
385 ## Otherwise process as indicated by the mark.
386 for i in $inchains; do
387 run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
391 ###----- That's all, folks --------------------------------------------------