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
17 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 default
96 iface eth0.1 dmz unsafe safe default
98 iface eth0.3 untrusted default
101 iface vpn-precision colobdry vpn
104 iface br-dmz dmz unsafe
105 iface br-unsafe unsafe
111 ## Colocated networks.
113 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
116 addr 172.29.199.176/28 2001:ba8:1d9:2::/64
118 defnet colohub virtual
119 forwards colobdry jump colo
120 defnet colobdry virtual
126 iface br-jump jump colo
127 iface br-colo jump colo
133 iface vpn-vampire housebdry vpn
146 forwards housebdry colobdry
147 defnet default untrusted
148 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
149 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
150 addr 2001:ba8:1d9::/48 #temporary
151 forwards dmz untrusted unsafe jump colo
154 ###--------------------------------------------------------------------------
155 ### Special forwarding exemptions.
160 ## Only allow these packets if they're not fragmented. (Don't trust safe
161 ## hosts's fragment reassembly to be robust against malicious fragments.)
162 ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
163 ## of `! -f', so we do the negation using early return from a subchain.
164 clearchain fwd-spec-nofrag
165 run iptables -A fwd-spec-nofrag -j RETURN --fragment
166 run ip6tables -A fwd-spec-nofrag -j RETURN \
167 -m ipv6header --soft --header frag
168 run ip46tables -A FORWARD -j fwd-spec-nofrag
170 ## Allow ping from safe/noloop to untrusted networks.
171 run iptables -A fwd-spec-nofrag -j ACCEPT \
172 -p icmp --icmp-type echo-request \
173 -m mark --mark $to_untrusted/$MASK_TO
174 run iptables -A fwd-spec-nofrag -j ACCEPT \
175 -p icmp --icmp-type echo-reply \
176 -m mark --mark $from_untrusted/$MASK_FROM \
177 -m state --state ESTABLISHED
178 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
179 -p icmpv6 --icmpv6-type echo-request \
180 -m mark --mark $to_untrusted/$MASK_TO
181 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
182 -p icmpv6 --icmpv6-type echo-reply \
183 -m mark --mark $from_untrusted/$MASK_FROM \
184 -m state --state ESTABLISHED
186 ## Allow SSH from safe/noloop to untrusted networks.
187 run iptables -A fwd-spec-nofrag -j ACCEPT \
188 -p tcp --destination-port $port_ssh \
189 -m mark --mark $to_untrusted/$MASK_TO
190 run iptables -A fwd-spec-nofrag -j ACCEPT \
191 -p tcp --source-port $port_ssh \
192 -m mark --mark $from_untrusted/$MASK_FROM \
193 -m state --state ESTABLISHED
194 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
195 -p tcp --destination-port $port_ssh \
196 -m mark --mark $to_untrusted/$MASK_TO
197 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
198 -p tcp --source-port $port_ssh \
199 -m mark --mark $from_untrusted/$MASK_FROM \
200 -m state --state ESTABLISHED
206 ###--------------------------------------------------------------------------
207 ### Kill things we don't understand properly.
209 ### I don't like having to do this, but since I don't know how to do proper
210 ### multicast filtering, I'm just going to ban it from being forwarded.
212 errorchain poorly-understood REJECT
214 ## Ban multicast destination addresses in forwarding.
217 run iptables -A FORWARD -g poorly-understood \
219 run ip6tables -A FORWARD -g poorly-understood \
225 ###--------------------------------------------------------------------------
226 ### Locally-bound packet inspection.
230 ## Track connections.
234 ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
236 run iptables -A inbound -j ACCEPT \
237 -s 0.0.0.0 -d 255.255.255.255 \
238 -p udp --source-port $port_bootpc --destination-port $port_bootps
239 run iptables -A inbound -j ACCEPT \
241 -p udp --source-port $port_bootpc --destination-port $port_bootps
243 ## Allow incoming ping. This is the only ICMP left.
244 run ip46tables -A inbound -j ACCEPT -p icmp
247 ## Allow unusual things.
250 ## Inspect inbound packets from untrusted sources.
251 run ip46tables -A inbound -j forbidden
252 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
254 ## Otherwise process as indicated by the mark.
255 for i in $inchains; do
256 run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
260 ###----- That's all, folks --------------------------------------------------