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
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.
15 ### This program is distributed in the hope that it will be useful,
16 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ### GNU General Public License for more details.
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.
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.
36 ## Define the available network classes.
38 defnetclass untrusted untrusted trusted mcast
39 defnetclass trusted untrusted trusted safe noloop mcast
40 defnetclass safe trusted safe noloop mcast
41 defnetclass noloop trusted safe mcast
47 ###--------------------------------------------------------------------------
52 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
53 forwards unsafe untrusted
55 addr 172.29.199.0/25 2001:470:9740:1::/64
58 addr 172.29.199.192/27 2001:470:9740:4001::/64
60 defnet untrusted untrusted
61 addr 172.29.198.0/25 2001:470:9740:8001::/64
64 addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
65 forwards househub colohub
68 defnet iodine untrusted
69 addr 172.29.198.128/28
71 defnet househub virtual
72 forwards housebdry dmz unsafe safe untrusted
73 defnet housebdry virtual
80 iface eth0 dmz unsafe safe
81 iface eth1 dmz unsafe safe
95 iface eth0.0 dmz unsafe safe
96 iface eth0.1 dmz unsafe safe
98 iface eth0.3 untrusted
101 iface vpn-precision colobdry vpn
103 iface br-dmz dmz unsafe
104 iface br-unsafe unsafe
109 ## Colocated networks.
111 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
114 addr 172.29.199.176/28 2001:ba8:1d9:2::/64
116 defnet colohub virtual
117 forwards colobdry jump colo
118 defnet colobdry virtual
124 iface br-jump jump colo
125 iface br-colo jump colo
131 iface vpn-vampire housebdry vpn
144 forwards housebdry colobdry
145 defnet default untrusted
146 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
147 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
148 addr 2001:ba8:1d9::/48 #temporary
149 forwards dmz untrusted unsafe jump colo
152 ###--------------------------------------------------------------------------
153 ### Special forwarding exemptions.
158 ## Only allow these packets if they're not fragmented. (Don't trust safe
159 ## hosts's fragment reassembly to be robust against malicious fragments.)
160 ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
161 ## of `! -f', so we do the negation using early return from a subchain.
162 clearchain fwd-spec-nofrag
163 run iptables -A fwd-spec-nofrag -j RETURN --fragment
164 run ip6tables -A fwd-spec-nofrag -j RETURN \
165 -m ipv6header --soft --header frag
166 run ip46tables -A FORWARD -j fwd-spec-nofrag
168 ## Allow ping from safe/noloop to untrusted networks.
169 run iptables -A fwd-spec-nofrag -j ACCEPT \
170 -p icmp --icmp-type echo-request \
171 -m mark --mark $to_untrusted/$MASK_TO
172 run iptables -A fwd-spec-nofrag -j ACCEPT \
173 -p icmp --icmp-type echo-reply \
174 -m mark --mark $from_untrusted/$MASK_FROM \
175 -m state --state ESTABLISHED
176 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
177 -p icmpv6 --icmpv6-type echo-request \
178 -m mark --mark $to_untrusted/$MASK_TO
179 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
180 -p icmpv6 --icmpv6-type echo-reply \
181 -m mark --mark $from_untrusted/$MASK_FROM \
182 -m state --state ESTABLISHED
184 ## Allow SSH from safe/noloop to untrusted networks.
185 run iptables -A fwd-spec-nofrag -j ACCEPT \
186 -p tcp --destination-port $port_ssh \
187 -m mark --mark $to_untrusted/$MASK_TO
188 run iptables -A fwd-spec-nofrag -j ACCEPT \
189 -p tcp --source-port $port_ssh \
190 -m mark --mark $from_untrusted/$MASK_FROM \
191 -m state --state ESTABLISHED
192 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
193 -p tcp --destination-port $port_ssh \
194 -m mark --mark $to_untrusted/$MASK_TO
195 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
196 -p tcp --source-port $port_ssh \
197 -m mark --mark $from_untrusted/$MASK_FROM \
198 -m state --state ESTABLISHED
204 ###--------------------------------------------------------------------------
205 ### Kill things we don't understand properly.
207 ### I don't like having to do this, but since I don't know how to do proper
208 ### multicast filtering, I'm just going to ban it from being forwarded.
210 errorchain poorly-understood REJECT
212 ## Ban multicast destination addresses in forwarding.
215 run iptables -A FORWARD -g poorly-understood \
217 run ip6tables -A FORWARD -g poorly-understood \
223 ###--------------------------------------------------------------------------
224 ### Locally-bound packet inspection.
228 ## Track connections.
232 ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
234 run iptables -A inbound -j ACCEPT \
235 -s 0.0.0.0 -d 255.255.255.255 \
236 -p udp --source-port $port_bootpc --destination-port $port_bootps
237 run iptables -A inbound -j ACCEPT \
239 -p udp --source-port $port_bootpc --destination-port $port_bootps
241 ## Allow incoming ping. This is the only ICMP left.
242 run ip46tables -A inbound -j ACCEPT -p icmp
245 ## Allow unusual things.
248 ## Inspect inbound packets from untrusted sources.
249 run ip46tables -A inbound -j forbidden
250 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
252 ## Otherwise process as indicated by the mark.
253 for i in $inchains; do
254 run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
258 ###----- That's all, folks --------------------------------------------------