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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 | ||
335b2afe MW |
24 | ###-------------------------------------------------------------------------- |
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) | |
bfdc045d MW |
33 | ###-------------------------------------------------------------------------- |
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 |
bfdc045d | 63 | |
beb4f0ee MW |
64 | defnet househub virtual |
65 | forwards housebdry dmz unsafe safe untrusted | |
66 | defnet housebdry virtual | |
67 | forwards househub hub | |
68 | noxit dmz | |
69 | ||
70 | ## House hosts. | |
71 | defhost radius | |
4eb9f4df | 72 | hosttype router |
68f0829f MW |
73 | iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default |
74 | iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default | |
960a9996 | 75 | iface eth2 dmz unsafe safe untrusted vpn sgo colobdry |
68f0829f | 76 | iface eth3 untrusted vpn default |
8506ff83 | 77 | iface ppp0 default |
a7e48c06 | 78 | iface t6-he default |
68f0829f MW |
79 | iface vpn-precision colobdry vpn sgo |
80 | iface vpn-chiark sgo | |
81 | iface vpn-+ vpn | |
beb4f0ee | 82 | defhost roadstar |
ce6434f7 MW |
83 | iface eth0 dmz unsafe |
84 | iface eth1 dmz unsafe | |
beb4f0ee | 85 | defhost jem |
ce6434f7 MW |
86 | iface eth0 dmz unsafe |
87 | iface eth1 dmz unsafe | |
beb4f0ee | 88 | defhost artist |
564c6939 | 89 | hosttype router |
490003e4 MW |
90 | iface eth0 dmz unsafe untrusted |
91 | iface eth1 dmz unsafe untrusted | |
564c6939 | 92 | iface eth3 untrusted |
beb4f0ee | 93 | defhost vampire |
4eb9f4df | 94 | hosttype router |
2b17ac87 MW |
95 | iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry |
96 | iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry | |
97 | iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry | |
98 | iface eth0.7 untrusted | |
68f0829f | 99 | iface vpn-precision colobdry vpn sgo |
ebaa31a7 MW |
100 | iface vpn-chiark sgo |
101 | iface vpn-+ vpn | |
beb4f0ee | 102 | defhost ibanez |
06ff8082 | 103 | iface br-dmz dmz unsafe |
beb4f0ee MW |
104 | iface br-unsafe unsafe |
105 | ||
106 | defhost gibson | |
4eb9f4df | 107 | hosttype client |
beb4f0ee MW |
108 | iface eth0 unsafe |
109 | ||
110 | ## Colocated networks. | |
111 | defnet jump trusted | |
b9e891b5 | 112 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 |
beb4f0ee MW |
113 | forwards colohub |
114 | defnet colo trusted | |
b9e891b5 | 115 | addr 172.29.199.176/28 2001:ba8:1d9:2::/64 |
beb4f0ee MW |
116 | forwards colohub |
117 | defnet colohub virtual | |
148d527c | 118 | forwards colobdry jump colo iodine |
beb4f0ee MW |
119 | defnet colobdry virtual |
120 | forwards colohub hub | |
121 | noxit jump | |
148d527c MW |
122 | defnet iodine untrusted |
123 | addr 172.29.198.128/28 | |
124 | forwards colohub | |
beb4f0ee MW |
125 | |
126 | ## Colocated hosts. | |
127 | defhost fender | |
ce6434f7 MW |
128 | iface br-jump jump colo |
129 | iface br-colo jump colo | |
beb4f0ee | 130 | defhost precision |
4eb9f4df | 131 | hosttype router |
68f0829f MW |
132 | iface eth0 jump colo sgo |
133 | iface eth1 jump colo sgo | |
134 | iface vpn-radius housebdry vpn sgo | |
ebaa31a7 MW |
135 | iface vpn-chiark sgo |
136 | iface vpn-+ vpn | |
beb4f0ee | 137 | defhost telecaster |
ce6434f7 MW |
138 | iface eth0 jump colo |
139 | iface eth1 jump colo | |
beb4f0ee | 140 | defhost stratocaster |
ce6434f7 MW |
141 | iface eth0 jump colo |
142 | iface eth1 jump colo | |
beb4f0ee | 143 | defhost jazz |
ce6434f7 MW |
144 | iface eth0 jump colo |
145 | iface eth1 jump colo | |
148d527c | 146 | iface dns0 iodine |
beb4f0ee MW |
147 | |
148 | ## Other networks. | |
149 | defnet hub virtual | |
150 | forwards housebdry colobdry | |
ebaa31a7 MW |
151 | defnet sgo noloop |
152 | addr !172.29.198.0/23 | |
153 | addr 10.0.0.0/8 | |
154 | addr 172.16.0.0/12 | |
155 | addr 192.168.0.0/16 | |
156 | forwards househub colohub | |
7dff2754 MW |
157 | defnet vpn safe |
158 | addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 | |
159 | forwards househub colohub | |
160 | host crybaby 1 | |
161 | host terror 2 | |
c68b8ecc MW |
162 | defnet anycast trusted |
163 | addr 172.29.199.224/27 2001:ba8:1d9:0::/64 | |
164 | forwards dmz unsafe safe untrusted jump colo vpn | |
beb4f0ee | 165 | defnet default untrusted |
b9e891b5 MW |
166 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
167 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 | |
168 | addr 2001:ba8:1d9::/48 #temporary | |
793937d8 | 169 | forwards dmz unsafe untrusted jump colo |
1ee6211d | 170 | |
a4d8cae3 | 171 | m4_divert(80)m4_dnl |
bfdc045d MW |
172 | ###-------------------------------------------------------------------------- |
173 | ### Special forwarding exemptions. | |
174 | ||
78af294c MW |
175 | case $forward in |
176 | 1) | |
177 | ||
178 | ## Only allow these packets if they're not fragmented. (Don't trust safe | |
179 | ## hosts's fragment reassembly to be robust against malicious fragments.) | |
180 | ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning | |
181 | ## of `! -f', so we do the negation using early return from a subchain. | |
182 | clearchain fwd-spec-nofrag | |
183 | run iptables -A fwd-spec-nofrag -j RETURN --fragment | |
184 | run ip6tables -A fwd-spec-nofrag -j RETURN \ | |
185 | -m ipv6header --soft --header frag | |
87bf1592 | 186 | run ip46tables -A FORWARD -j fwd-spec-nofrag |
78af294c MW |
187 | |
188 | ## Allow ping from safe/noloop to untrusted networks. | |
189 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
190 | -p icmp --icmp-type echo-request \ | |
191 | -m mark --mark $to_untrusted/$MASK_TO | |
192 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
193 | -p icmp --icmp-type echo-reply \ | |
194 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
195 | -m state --state ESTABLISHED | |
196 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 197 | -p icmpv6 --icmpv6-type echo-request \ |
78af294c MW |
198 | -m mark --mark $to_untrusted/$MASK_TO |
199 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
8b021091 | 200 | -p icmpv6 --icmpv6-type echo-reply \ |
78af294c MW |
201 | -m mark --mark $from_untrusted/$MASK_FROM \ |
202 | -m state --state ESTABLISHED | |
203 | ||
204 | ## Allow SSH from safe/noloop to untrusted networks. | |
cbbd5e39 | 205 | run ip46tables -A fwd-spec-nofrag -j ACCEPT \ |
78af294c MW |
206 | -p tcp --destination-port $port_ssh \ |
207 | -m mark --mark $to_untrusted/$MASK_TO | |
cbbd5e39 | 208 | run ip46tables -A fwd-spec-nofrag -j ACCEPT \ |
78af294c MW |
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 -------------------------------------------------- |