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
124 ###--------------------------------------------------------------------------
129 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
130 forwards unsafe untrusted
131 defnet unsafe trusted
132 addr 172.29.199.0/25 2001:470:9740:1::/64
135 addr 172.29.199.192/27 2001:470:9740:4001::/64
137 defnet untrusted untrusted
138 addr 172.29.198.0/25 2001:470:9740:8001::/64
141 defnet househub virtual
142 forwards housebdry dmz unsafe safe untrusted
143 defnet housebdry virtual
144 forwards househub hub
150 iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
151 iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
152 iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
153 iface eth3 untrusted vpn default
156 iface vpn-precision colobdry vpn sgo
160 iface eth0 dmz unsafe
161 iface eth1 dmz unsafe
163 iface eth0 dmz unsafe
164 iface eth1 dmz unsafe
167 iface eth0 dmz unsafe untrusted
168 iface eth1 dmz unsafe untrusted
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
176 iface vpn-precision colobdry vpn sgo
180 iface br-dmz dmz unsafe
181 iface br-unsafe unsafe
187 ## Colocated networks.
189 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
192 addr 172.29.199.176/28 2001:ba8:1d9:2::/64
194 defnet colohub virtual
195 forwards colobdry jump colo iodine
196 defnet colobdry virtual
199 defnet iodine untrusted
200 addr 172.29.198.128/28
205 iface br-jump jump colo
206 iface br-colo jump colo
209 iface eth0 jump colo sgo
210 iface eth1 jump colo sgo
211 iface vpn-radius housebdry vpn sgo
227 forwards housebdry colobdry
229 addr !172.29.198.0/23
233 forwards househub colohub
235 addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
236 forwards househub colohub
239 defnet anycast trusted
240 addr 172.29.199.224/27 2001:ba8:1d9:0::/64
241 forwards dmz unsafe safe untrusted jump colo vpn
242 defnet default untrusted
243 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
244 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
245 addr 2001:ba8:1d9::/48 #temporary
246 forwards dmz unsafe untrusted jump colo
249 ###--------------------------------------------------------------------------
250 ### Special forwarding exemptions.
255 ## Only allow these packets if they're not fragmented. (Don't trust safe
256 ## hosts's fragment reassembly to be robust against malicious fragments.)
257 ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
258 ## of `! -f', so we do the negation using early return from a subchain.
259 clearchain fwd-spec-nofrag
260 run iptables -A fwd-spec-nofrag -j RETURN --fragment
261 run ip6tables -A fwd-spec-nofrag -j RETURN \
262 -m ipv6header --soft --header frag
263 run ip46tables -A FORWARD -j fwd-spec-nofrag
265 ## Allow ping from safe/noloop to untrusted networks.
266 run iptables -A fwd-spec-nofrag -j ACCEPT \
267 -p icmp --icmp-type echo-request \
268 -m mark --mark $to_untrusted/$MASK_TO
269 run iptables -A fwd-spec-nofrag -j ACCEPT \
270 -p icmp --icmp-type echo-reply \
271 -m mark --mark $from_untrusted/$MASK_FROM \
272 -m state --state ESTABLISHED
273 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
274 -p icmpv6 --icmpv6-type echo-request \
275 -m mark --mark $to_untrusted/$MASK_TO
276 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
277 -p icmpv6 --icmpv6-type echo-reply \
278 -m mark --mark $from_untrusted/$MASK_FROM \
279 -m state --state ESTABLISHED
281 ## Allow SSH from safe/noloop to untrusted networks.
282 run ip46tables -A fwd-spec-nofrag -j ACCEPT \
283 -p tcp --destination-port $port_ssh \
284 -m mark --mark $to_untrusted/$MASK_TO
285 run ip46tables -A fwd-spec-nofrag -j ACCEPT \
286 -p tcp --source-port $port_ssh \
287 -m mark --mark $from_untrusted/$MASK_FROM \
288 -m state --state ESTABLISHED
294 ###--------------------------------------------------------------------------
295 ### Kill things we don't understand properly.
297 ### I don't like having to do this, but since I don't know how to do proper
298 ### multicast filtering, I'm just going to ban it from being forwarded.
300 errorchain poorly-understood REJECT
302 ## Ban multicast destination addresses in forwarding.
305 run iptables -A FORWARD -g poorly-understood \
307 run ip6tables -A FORWARD -g poorly-understood \
313 ###--------------------------------------------------------------------------
314 ### Locally-bound packet inspection.
318 ## Track connections.
322 ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
324 run iptables -A inbound -j ACCEPT \
325 -s 0.0.0.0 -d 255.255.255.255 \
326 -p udp --source-port $port_bootpc --destination-port $port_bootps
327 run iptables -A inbound -j ACCEPT \
329 -p udp --source-port $port_bootpc --destination-port $port_bootps
331 ## Allow incoming ping. This is the only ICMP left.
332 run ip46tables -A inbound -j ACCEPT -p icmp
335 ## Allow unusual things.
338 ## Inspect inbound packets from untrusted sources.
339 run ip46tables -A inbound -j forbidden
340 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
342 ## Otherwise process as indicated by the mark.
343 for i in $inchains; do
344 run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
348 ###----- That's all, folks --------------------------------------------------