3 ### Local firewall configuration
5 ### (c) 2008 Mark Wooding
8 ###----- Licensing notice ---------------------------------------------------
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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 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
125 ###--------------------------------------------------------------------------
130 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
132 defnet unsafe trusted
133 addr 172.29.199.0/25 2001:470:9740:1::/64
136 addr 172.29.199.192/27 2001:470:9740:4001::/64
138 defnet untrusted untrusted
139 addr 172.29.198.0/25 2001:470:9740:8001::/64
142 defnet househub virtual
143 via housebdry dmz unsafe safe untrusted
144 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
191 ## Colocated networks.
193 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
196 addr 172.29.199.176/28 2001:ba8:1d9:2::/64
198 defnet colohub virtual
199 via colobdry jump colo
200 defnet colobdry virtual
203 defnet iodine untrusted
204 addr 172.29.198.128/28
209 iface br-jump jump colo
210 iface br-colo jump colo
213 iface eth0 jump colo vpn sgo
214 iface eth1 jump colo vpn sgo
215 iface vpn-mango binswood
216 iface vpn-radius housebdry vpn sgo
229 iface eth0 jump colo vpn
230 iface eth1 jump colo vpn
236 via housebdry colobdry
238 addr !172.29.198.0/23
244 addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
249 defnet anycast trusted
250 addr 172.29.199.224/27 2001:ba8:1d9:0::/64
251 via dmz unsafe safe untrusted jump colo vpn
252 defnet default untrusted
253 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
254 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
255 addr 2001:ba8:1d9::/48 #temporary
256 via dmz unsafe untrusted jump colo
258 ## Satellite networks.
259 defnet binswood noloop
265 iface eth0 binswood default
266 iface vpn-precision colo
269 ###--------------------------------------------------------------------------
270 ### Special forwarding exemptions.
275 ## Only allow these packets if they're not fragmented. (Don't trust safe
276 ## hosts's fragment reassembly to be robust against malicious fragments.)
277 ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
278 ## of `! -f', so we do the negation using early return from a subchain.
279 clearchain fwd-spec-nofrag
280 run iptables -A fwd-spec-nofrag -j RETURN --fragment
281 run ip6tables -A fwd-spec-nofrag -j RETURN \
282 -m ipv6header --soft --header frag
283 run ip46tables -A FORWARD -j fwd-spec-nofrag
285 ## Allow ping from safe/noloop to untrusted networks.
286 run iptables -A fwd-spec-nofrag -j ACCEPT \
287 -p icmp --icmp-type echo-request \
288 -m mark --mark $to_untrusted/$MASK_TO
289 run iptables -A fwd-spec-nofrag -j ACCEPT \
290 -p icmp --icmp-type echo-reply \
291 -m mark --mark $from_untrusted/$MASK_FROM \
292 -m state --state ESTABLISHED
293 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
294 -p icmpv6 --icmpv6-type echo-request \
295 -m mark --mark $to_untrusted/$MASK_TO
296 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
297 -p icmpv6 --icmpv6-type echo-reply \
298 -m mark --mark $from_untrusted/$MASK_FROM \
299 -m state --state ESTABLISHED
301 ## Allow SSH from safe/noloop to untrusted networks.
302 run ip46tables -A fwd-spec-nofrag -j ACCEPT \
303 -p tcp --destination-port $port_ssh \
304 -m mark --mark $to_untrusted/$MASK_TO
305 run ip46tables -A fwd-spec-nofrag -j ACCEPT \
306 -p tcp --source-port $port_ssh \
307 -m mark --mark $from_untrusted/$MASK_FROM \
308 -m state --state ESTABLISHED
314 ###--------------------------------------------------------------------------
315 ### Kill things we don't understand properly.
317 ### I don't like having to do this, but since I don't know how to do proper
318 ### multicast filtering, I'm just going to ban it from being forwarded.
320 errorchain poorly-understood REJECT
322 ## Ban multicast destination addresses in forwarding.
325 run iptables -A FORWARD -g poorly-understood \
327 run ip6tables -A FORWARD -g poorly-understood \
333 ###--------------------------------------------------------------------------
334 ### Locally-bound packet inspection.
338 ## Track connections.
342 ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
344 run iptables -A inbound -j ACCEPT \
345 -s 0.0.0.0 -d 255.255.255.255 \
346 -p udp --source-port $port_bootpc --destination-port $port_bootps
347 run iptables -A inbound -j ACCEPT \
349 -p udp --source-port $port_bootpc --destination-port $port_bootps
351 ## Allow incoming ping. This is the only ICMP left.
352 run ip46tables -A inbound -j ACCEPT -p icmp
355 ## Allow unusual things.
358 ## Inspect inbound packets from untrusted sources.
359 run ip46tables -A inbound -j forbidden
360 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
362 ## Otherwise process as indicated by the mark.
363 for i in $inchains; do
364 run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
368 ###----- That's all, folks --------------------------------------------------