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775bd287 | 1 | ### -*-sh-*- |
bfdc045d MW |
2 | ### |
3 | ### Local firewall configuration | |
4 | ### | |
5 | ### (c) 2008 Mark Wooding | |
6 | ### | |
7 | ||
8 | ###----- Licensing notice --------------------------------------------------- | |
9 | ### | |
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. | |
14 | ### | |
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. | |
19 | ### | |
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. | |
23 | ||
24 | ###-------------------------------------------------------------------------- | |
335b2afe MW |
25 | ### Local configuration. |
26 | ||
27 | m4_divert(6)m4_dnl | |
28 | ## Default NTP servers. | |
29 | defconf(ntp_servers, | |
30 | "158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232") | |
31 | ||
32 | m4_divert(-1) | |
33 | ###-------------------------------------------------------------------------- | |
bfdc045d MW |
34 | ### Packet classification. |
35 | ||
36 | ## Define the available network classes. | |
37 | m4_divert(42)m4_dnl | |
44f95827 MW |
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 | |
42 | defnetclass link | |
43 | defnetclass mcast | |
a4d8cae3 | 44 | m4_divert(-1) |
bfdc045d | 45 | |
a4d8cae3 | 46 | m4_divert(26)m4_dnl |
bfdc045d MW |
47 | ###-------------------------------------------------------------------------- |
48 | ### Network layout. | |
49 | ||
beb4f0ee MW |
50 | ## House networks. |
51 | defnet dmz trusted | |
b9e891b5 | 52 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
beb4f0ee MW |
53 | forwards unsafe untrusted |
54 | defnet unsafe trusted | |
b9e891b5 | 55 | addr 172.29.199.0/25 2001:470:9740:1::/64 |
beb4f0ee MW |
56 | forwards househub |
57 | defnet safe safe | |
216285e1 | 58 | addr 172.29.199.192/27 2001:470:9740:4001::/64 |
beb4f0ee MW |
59 | forwards househub |
60 | defnet untrusted untrusted | |
b9e891b5 | 61 | addr 172.29.198.0/25 2001:470:9740:8001::/64 |
beb4f0ee | 62 | forwards househub |
beb4f0ee MW |
63 | defnet iodine untrusted |
64 | addr 172.29.198.128/28 | |
bfdc045d | 65 | |
beb4f0ee MW |
66 | defnet househub virtual |
67 | forwards housebdry dmz unsafe safe untrusted | |
68 | defnet housebdry virtual | |
69 | forwards househub hub | |
70 | noxit dmz | |
71 | ||
72 | ## House hosts. | |
73 | defhost radius | |
4eb9f4df | 74 | hosttype router |
a7e48c06 MW |
75 | iface eth0 dmz unsafe safe default |
76 | iface eth1 dmz unsafe safe default | |
beb4f0ee | 77 | iface eth2 safe |
a7e48c06 MW |
78 | iface eth3 untrusted default |
79 | iface t6-he default | |
beb4f0ee | 80 | defhost roadstar |
ce6434f7 MW |
81 | iface eth0 dmz unsafe |
82 | iface eth1 dmz unsafe | |
beb4f0ee | 83 | defhost jem |
ce6434f7 MW |
84 | iface eth0 dmz unsafe |
85 | iface eth1 dmz unsafe | |
beb4f0ee | 86 | defhost artist |
ce6434f7 MW |
87 | iface eth0 dmz unsafe |
88 | iface eth1 dmz unsafe | |
beb4f0ee | 89 | defhost vampire |
4eb9f4df | 90 | hosttype router |
e66833d3 MW |
91 | iface eth0.0 dmz unsafe safe |
92 | iface eth0.1 dmz unsafe safe | |
93 | iface eth0.2 safe | |
beb4f0ee | 94 | iface eth0.3 untrusted |
ebaa31a7 | 95 | iface dns0 iodine |
beb4f0ee | 96 | iface vpn-precision colobdry vpn |
ebaa31a7 MW |
97 | iface vpn-chiark sgo |
98 | iface vpn-+ vpn | |
beb4f0ee | 99 | defhost ibanez |
06ff8082 | 100 | iface br-dmz dmz unsafe |
beb4f0ee MW |
101 | iface br-unsafe unsafe |
102 | ||
103 | defhost gibson | |
4eb9f4df | 104 | hosttype client |
beb4f0ee MW |
105 | iface eth0 unsafe |
106 | ||
107 | ## Colocated networks. | |
108 | defnet jump trusted | |
b9e891b5 | 109 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 |
beb4f0ee MW |
110 | forwards colohub |
111 | defnet colo trusted | |
b9e891b5 | 112 | addr 172.29.199.176/28 2001:ba8:1d9:2::/64 |
beb4f0ee MW |
113 | forwards colohub |
114 | defnet colohub virtual | |
115 | forwards colobdry jump colo | |
116 | defnet colobdry virtual | |
117 | forwards colohub hub | |
118 | noxit jump | |
119 | ||
120 | ## Colocated hosts. | |
121 | defhost fender | |
ce6434f7 MW |
122 | iface br-jump jump colo |
123 | iface br-colo jump colo | |
beb4f0ee | 124 | defhost precision |
4eb9f4df | 125 | hosttype router |
ce6434f7 MW |
126 | iface eth0 jump colo |
127 | iface eth1 jump colo | |
beb4f0ee | 128 | iface vpn-vampire housebdry vpn |
ebaa31a7 MW |
129 | iface vpn-chiark sgo |
130 | iface vpn-+ vpn | |
beb4f0ee | 131 | defhost telecaster |
ce6434f7 MW |
132 | iface eth0 jump colo |
133 | iface eth1 jump colo | |
beb4f0ee | 134 | defhost stratocaster |
ce6434f7 MW |
135 | iface eth0 jump colo |
136 | iface eth1 jump colo | |
beb4f0ee | 137 | defhost jazz |
ce6434f7 MW |
138 | iface eth0 jump colo |
139 | iface eth1 jump colo | |
beb4f0ee MW |
140 | |
141 | ## Other networks. | |
142 | defnet hub virtual | |
143 | forwards housebdry colobdry | |
ebaa31a7 MW |
144 | defnet sgo noloop |
145 | addr !172.29.198.0/23 | |
146 | addr 10.0.0.0/8 | |
147 | addr 172.16.0.0/12 | |
148 | addr 192.168.0.0/16 | |
149 | forwards househub colohub | |
7dff2754 MW |
150 | defnet vpn safe |
151 | addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 | |
152 | forwards househub colohub | |
153 | host crybaby 1 | |
154 | host terror 2 | |
c68b8ecc MW |
155 | defnet anycast trusted |
156 | addr 172.29.199.224/27 2001:ba8:1d9:0::/64 | |
157 | forwards dmz unsafe safe untrusted jump colo vpn | |
beb4f0ee | 158 | defnet default untrusted |
b9e891b5 MW |
159 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
160 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 | |
161 | addr 2001:ba8:1d9::/48 #temporary | |
793937d8 | 162 | forwards dmz unsafe untrusted jump colo |
1ee6211d | 163 | |
a4d8cae3 | 164 | m4_divert(80)m4_dnl |
bfdc045d MW |
165 | ###-------------------------------------------------------------------------- |
166 | ### Special forwarding exemptions. | |
167 | ||
78af294c MW |
168 | case $forward in |
169 | 1) | |
170 | ||
171 | ## Only allow these packets if they're not fragmented. (Don't trust safe | |
172 | ## hosts's fragment reassembly to be robust against malicious fragments.) | |
173 | ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning | |
174 | ## of `! -f', so we do the negation using early return from a subchain. | |
175 | clearchain fwd-spec-nofrag | |
176 | run iptables -A fwd-spec-nofrag -j RETURN --fragment | |
177 | run ip6tables -A fwd-spec-nofrag -j RETURN \ | |
178 | -m ipv6header --soft --header frag | |
87bf1592 | 179 | run ip46tables -A FORWARD -j fwd-spec-nofrag |
78af294c MW |
180 | |
181 | ## Allow ping from safe/noloop to untrusted networks. | |
182 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
183 | -p icmp --icmp-type echo-request \ | |
184 | -m mark --mark $to_untrusted/$MASK_TO | |
185 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
186 | -p icmp --icmp-type echo-reply \ | |
187 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
188 | -m state --state ESTABLISHED | |
189 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 190 | -p icmpv6 --icmpv6-type echo-request \ |
78af294c MW |
191 | -m mark --mark $to_untrusted/$MASK_TO |
192 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 193 | -p icmpv6 --icmpv6-type echo-reply \ |
78af294c MW |
194 | -m mark --mark $from_untrusted/$MASK_FROM \ |
195 | -m state --state ESTABLISHED | |
196 | ||
197 | ## Allow SSH from safe/noloop to untrusted networks. | |
198 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
199 | -p tcp --destination-port $port_ssh \ | |
200 | -m mark --mark $to_untrusted/$MASK_TO | |
201 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
202 | -p tcp --source-port $port_ssh \ | |
203 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
204 | -m state --state ESTABLISHED | |
205 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
206 | -p tcp --destination-port $port_ssh \ | |
207 | -m mark --mark $to_untrusted/$MASK_TO | |
208 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
209 | -p tcp --source-port $port_ssh \ | |
210 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
211 | -m state --state ESTABLISHED | |
212 | ||
213 | ;; | |
214 | esac | |
215 | ||
a4d8cae3 | 216 | m4_divert(80)m4_dnl |
ade2c052 MW |
217 | ###-------------------------------------------------------------------------- |
218 | ### Kill things we don't understand properly. | |
219 | ### | |
220 | ### I don't like having to do this, but since I don't know how to do proper | |
221 | ### multicast filtering, I'm just going to ban it from being forwarded. | |
222 | ||
223 | errorchain poorly-understood REJECT | |
224 | ||
225 | ## Ban multicast destination addresses in forwarding. | |
78af294c MW |
226 | case $forward in |
227 | 1) | |
228 | run iptables -A FORWARD -g poorly-understood \ | |
229 | -d 224.0.0.0/4 | |
230 | run ip6tables -A FORWARD -g poorly-understood \ | |
231 | -d ff::/8 | |
232 | ;; | |
233 | esac | |
ade2c052 | 234 | |
a4d8cae3 | 235 | m4_divert(84)m4_dnl |
bfdc045d MW |
236 | ###-------------------------------------------------------------------------- |
237 | ### Locally-bound packet inspection. | |
238 | ||
239 | clearchain inbound | |
240 | ||
241 | ## Track connections. | |
ecdca131 | 242 | commonrules inbound |
bfdc045d MW |
243 | conntrack inbound |
244 | ||
245 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
246 | ## local request. | |
247 | run iptables -A inbound -j ACCEPT \ | |
248 | -s 0.0.0.0 -d 255.255.255.255 \ | |
249 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
250 | run iptables -A inbound -j ACCEPT \ | |
251 | -s 172.29.198.0/23 \ | |
252 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
253 | ||
254 | ## Allow incoming ping. This is the only ICMP left. | |
0291d6d5 | 255 | run ip46tables -A inbound -j ACCEPT -p icmp |
bfdc045d MW |
256 | |
257 | m4_divert(88)m4_dnl | |
258 | ## Allow unusual things. | |
259 | openports inbound | |
260 | ||
261 | ## Inspect inbound packets from untrusted sources. | |
0291d6d5 MW |
262 | run ip46tables -A inbound -j forbidden |
263 | run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound | |
bfdc045d MW |
264 | |
265 | ## Otherwise process as indicated by the mark. | |
f0033e07 MW |
266 | for i in $inchains; do |
267 | run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT | |
268 | done | |
bfdc045d MW |
269 | |
270 | m4_divert(-1) | |
271 | ###----- That's all, folks -------------------------------------------------- |