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