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
63 defnet iodine untrusted
64 addr 172.29.198.128/28
66 defnet househub virtual
67 forwards housebdry dmz unsafe safe untrusted
68 defnet housebdry virtual
75 iface eth0 dmz unsafe safe default
76 iface eth1 dmz unsafe safe default
78 iface eth3 untrusted default
93 iface eth0.0 dmz unsafe safe
94 iface eth0.1 dmz unsafe safe
96 iface eth0.3 untrusted
98 iface vpn-precision colobdry vpn
102 iface br-dmz dmz unsafe
103 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
130 iface vpn-vampire housebdry vpn
145 forwards housebdry colobdry
147 addr !172.29.198.0/23
151 forwards househub colohub
153 addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
154 forwards househub colohub
157 defnet anycast trusted
158 addr 172.29.199.224/27 2001:ba8:1d9:0::/64
159 forwards dmz unsafe safe untrusted jump colo vpn
160 defnet default untrusted
161 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
162 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
163 addr 2001:ba8:1d9::/48 #temporary
164 forwards dmz unsafe untrusted jump colo
167 ###--------------------------------------------------------------------------
168 ### Special forwarding exemptions.
173 ## Only allow these packets if they're not fragmented. (Don't trust safe
174 ## hosts's fragment reassembly to be robust against malicious fragments.)
175 ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
176 ## of `! -f', so we do the negation using early return from a subchain.
177 clearchain fwd-spec-nofrag
178 run iptables -A fwd-spec-nofrag -j RETURN --fragment
179 run ip6tables -A fwd-spec-nofrag -j RETURN \
180 -m ipv6header --soft --header frag
181 run ip46tables -A FORWARD -j fwd-spec-nofrag
183 ## Allow ping from safe/noloop to untrusted networks.
184 run iptables -A fwd-spec-nofrag -j ACCEPT \
185 -p icmp --icmp-type echo-request \
186 -m mark --mark $to_untrusted/$MASK_TO
187 run iptables -A fwd-spec-nofrag -j ACCEPT \
188 -p icmp --icmp-type echo-reply \
189 -m mark --mark $from_untrusted/$MASK_FROM \
190 -m state --state ESTABLISHED
191 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
192 -p icmpv6 --icmpv6-type echo-request \
193 -m mark --mark $to_untrusted/$MASK_TO
194 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
195 -p icmpv6 --icmpv6-type echo-reply \
196 -m mark --mark $from_untrusted/$MASK_FROM \
197 -m state --state ESTABLISHED
199 ## Allow SSH from safe/noloop to untrusted networks.
200 run iptables -A fwd-spec-nofrag -j ACCEPT \
201 -p tcp --destination-port $port_ssh \
202 -m mark --mark $to_untrusted/$MASK_TO
203 run iptables -A fwd-spec-nofrag -j ACCEPT \
204 -p tcp --source-port $port_ssh \
205 -m mark --mark $from_untrusted/$MASK_FROM \
206 -m state --state ESTABLISHED
207 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
208 -p tcp --destination-port $port_ssh \
209 -m mark --mark $to_untrusted/$MASK_TO
210 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
211 -p tcp --source-port $port_ssh \
212 -m mark --mark $from_untrusted/$MASK_FROM \
213 -m state --state ESTABLISHED
219 ###--------------------------------------------------------------------------
220 ### Kill things we don't understand properly.
222 ### I don't like having to do this, but since I don't know how to do proper
223 ### multicast filtering, I'm just going to ban it from being forwarded.
225 errorchain poorly-understood REJECT
227 ## Ban multicast destination addresses in forwarding.
230 run iptables -A FORWARD -g poorly-understood \
232 run ip6tables -A FORWARD -g poorly-understood \
238 ###--------------------------------------------------------------------------
239 ### Locally-bound packet inspection.
243 ## Track connections.
247 ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
249 run iptables -A inbound -j ACCEPT \
250 -s 0.0.0.0 -d 255.255.255.255 \
251 -p udp --source-port $port_bootpc --destination-port $port_bootps
252 run iptables -A inbound -j ACCEPT \
254 -p udp --source-port $port_bootpc --destination-port $port_bootps
256 ## Allow incoming ping. This is the only ICMP left.
257 run ip46tables -A inbound -j ACCEPT -p icmp
260 ## Allow unusual things.
263 ## Inspect inbound packets from untrusted sources.
264 run ip46tables -A inbound -j forbidden
265 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
267 ## Otherwise process as indicated by the mark.
268 for i in $inchains; do
269 run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
273 ###----- That's all, folks --------------------------------------------------