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
76 iface eth1 dmz unsafe safe
90 iface eth0.0 dmz unsafe safe default
91 iface eth0.1 dmz unsafe safe default
93 iface eth0.3 untrusted default
95 iface vpn-precision colobdry vpn
99 iface br-dmz dmz unsafe
100 iface br-unsafe unsafe
106 ## Colocated networks.
108 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
111 addr 172.29.199.176/28 2001:ba8:1d9:2::/64
113 defnet colohub virtual
114 forwards colobdry jump colo
115 defnet colobdry virtual
121 iface br-jump jump colo
122 iface br-colo jump colo
127 iface vpn-vampire housebdry vpn
142 forwards housebdry colobdry
144 addr !172.29.198.0/23
148 forwards househub colohub
150 addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
151 forwards househub colohub
154 defnet anycast trusted
155 addr 172.29.199.224/27 2001:ba8:1d9:0::/64
156 forwards dmz unsafe safe untrusted jump colo vpn
157 defnet default untrusted
158 addr 62.49.204.144/28 2001:470:1f09:1b98::/64
159 addr 212.13.198.64/28 2001:ba8:0:1d9::/64
160 addr 2001:ba8:1d9::/48 #temporary
161 forwards dmz unsafe untrusted jump colo
164 ###--------------------------------------------------------------------------
165 ### Special forwarding exemptions.
170 ## Only allow these packets if they're not fragmented. (Don't trust safe
171 ## hosts's fragment reassembly to be robust against malicious fragments.)
172 ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
173 ## of `! -f', so we do the negation using early return from a subchain.
174 clearchain fwd-spec-nofrag
175 run iptables -A fwd-spec-nofrag -j RETURN --fragment
176 run ip6tables -A fwd-spec-nofrag -j RETURN \
177 -m ipv6header --soft --header frag
178 run ip46tables -A FORWARD -j fwd-spec-nofrag
180 ## Allow ping from safe/noloop to untrusted networks.
181 run iptables -A fwd-spec-nofrag -j ACCEPT \
182 -p icmp --icmp-type echo-request \
183 -m mark --mark $to_untrusted/$MASK_TO
184 run iptables -A fwd-spec-nofrag -j ACCEPT \
185 -p icmp --icmp-type echo-reply \
186 -m mark --mark $from_untrusted/$MASK_FROM \
187 -m state --state ESTABLISHED
188 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
189 -p icmpv6 --icmpv6-type echo-request \
190 -m mark --mark $to_untrusted/$MASK_TO
191 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
192 -p icmpv6 --icmpv6-type echo-reply \
193 -m mark --mark $from_untrusted/$MASK_FROM \
194 -m state --state ESTABLISHED
196 ## Allow SSH from safe/noloop to untrusted networks.
197 run iptables -A fwd-spec-nofrag -j ACCEPT \
198 -p tcp --destination-port $port_ssh \
199 -m mark --mark $to_untrusted/$MASK_TO
200 run iptables -A fwd-spec-nofrag -j ACCEPT \
201 -p tcp --source-port $port_ssh \
202 -m mark --mark $from_untrusted/$MASK_FROM \
203 -m state --state ESTABLISHED
204 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
205 -p tcp --destination-port $port_ssh \
206 -m mark --mark $to_untrusted/$MASK_TO
207 run ip6tables -A fwd-spec-nofrag -j ACCEPT \
208 -p tcp --source-port $port_ssh \
209 -m mark --mark $from_untrusted/$MASK_FROM \
210 -m state --state ESTABLISHED
216 ###--------------------------------------------------------------------------
217 ### Kill things we don't understand properly.
219 ### I don't like having to do this, but since I don't know how to do proper
220 ### multicast filtering, I'm just going to ban it from being forwarded.
222 errorchain poorly-understood REJECT
224 ## Ban multicast destination addresses in forwarding.
227 run iptables -A FORWARD -g poorly-understood \
229 run ip6tables -A FORWARD -g poorly-understood \
235 ###--------------------------------------------------------------------------
236 ### Locally-bound packet inspection.
240 ## Track connections.
244 ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
246 run iptables -A inbound -j ACCEPT \
247 -s 0.0.0.0 -d 255.255.255.255 \
248 -p udp --source-port $port_bootpc --destination-port $port_bootps
249 run iptables -A inbound -j ACCEPT \
251 -p udp --source-port $port_bootpc --destination-port $port_bootps
253 ## Allow incoming ping. This is the only ICMP left.
254 run ip46tables -A inbound -j ACCEPT -p icmp
257 ## Allow unusual things.
260 ## Inspect inbound packets from untrusted sources.
261 run ip46tables -A inbound -j forbidden
262 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
264 ## Otherwise process as indicated by the mark.
265 for i in $inchains; do
266 run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
270 ###----- That's all, folks --------------------------------------------------