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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 | |
38 | defnetclass untrusted untrusted trusted | |
39 | defnetclass trusted untrusted trusted safe noloop | |
40 | defnetclass safe trusted safe noloop | |
41 | defnetclass noloop trusted safe | |
a4d8cae3 | 42 | m4_divert(-1) |
bfdc045d | 43 | |
a4d8cae3 | 44 | m4_divert(26)m4_dnl |
bfdc045d MW |
45 | ###-------------------------------------------------------------------------- |
46 | ### Network layout. | |
47 | ||
beb4f0ee MW |
48 | ## House networks. |
49 | defnet dmz trusted | |
b9e891b5 | 50 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
beb4f0ee MW |
51 | forwards unsafe untrusted |
52 | defnet unsafe trusted | |
b9e891b5 | 53 | addr 172.29.199.0/25 2001:470:9740:1::/64 |
beb4f0ee MW |
54 | forwards househub |
55 | defnet safe safe | |
216285e1 | 56 | addr 172.29.199.192/27 2001:470:9740:4001::/64 |
beb4f0ee MW |
57 | forwards househub |
58 | defnet untrusted untrusted | |
b9e891b5 | 59 | addr 172.29.198.0/25 2001:470:9740:8001::/64 |
beb4f0ee MW |
60 | forwards househub |
61 | defnet vpn safe | |
b9e891b5 | 62 | addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 |
f967aa21 | 63 | forwards househub colohub |
beb4f0ee MW |
64 | host crybaby 1 |
65 | host terror 2 | |
66 | defnet iodine untrusted | |
67 | addr 172.29.198.128/28 | |
bfdc045d | 68 | |
beb4f0ee MW |
69 | defnet househub virtual |
70 | forwards housebdry dmz unsafe safe untrusted | |
71 | defnet housebdry virtual | |
72 | forwards househub hub | |
73 | noxit dmz | |
74 | ||
75 | ## House hosts. | |
76 | defhost radius | |
77 | router | |
e66833d3 MW |
78 | iface eth0 dmz unsafe safe |
79 | iface eth1 dmz unsafe safe | |
beb4f0ee MW |
80 | iface eth2 safe |
81 | iface eth3 untrusted | |
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 |
ce6434f7 MW |
89 | iface eth0 dmz unsafe |
90 | iface eth1 dmz unsafe | |
beb4f0ee MW |
91 | defhost vampire |
92 | router | |
e66833d3 MW |
93 | iface eth0.0 dmz unsafe safe |
94 | iface eth0.1 dmz unsafe safe | |
95 | iface eth0.2 safe | |
beb4f0ee MW |
96 | iface eth0.3 untrusted |
97 | iface dns0 dns | |
98 | iface vpn-+ vpn | |
99 | iface vpn-precision colobdry vpn | |
100 | defhost ibanez | |
06ff8082 | 101 | iface br-dmz dmz unsafe |
beb4f0ee MW |
102 | iface br-unsafe unsafe |
103 | ||
104 | defhost gibson | |
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 MW |
124 | defhost precision |
125 | router | |
ce6434f7 MW |
126 | iface eth0 jump colo |
127 | iface eth1 jump colo | |
beb4f0ee MW |
128 | iface vpn-+ vpn |
129 | iface vpn-vampire housebdry vpn | |
130 | defhost telecaster | |
ce6434f7 MW |
131 | iface eth0 jump colo |
132 | iface eth1 jump colo | |
beb4f0ee | 133 | defhost stratocaster |
ce6434f7 MW |
134 | iface eth0 jump colo |
135 | iface eth1 jump colo | |
beb4f0ee | 136 | defhost jazz |
ce6434f7 MW |
137 | iface eth0 jump colo |
138 | iface eth1 jump colo | |
beb4f0ee MW |
139 | |
140 | ## Other networks. | |
141 | defnet hub virtual | |
142 | forwards housebdry colobdry | |
143 | defnet default untrusted | |
b9e891b5 MW |
144 | addr 62.49.204.144/28 2001:470:1f09:1b98::/64 |
145 | addr 212.13.198.64/28 2001:ba8:0:1d9::/64 | |
146 | addr 2001:ba8:1d9::/48 #temporary | |
beb4f0ee | 147 | forwards dmz untrusted unsafe jump colo |
1ee6211d | 148 | |
a4d8cae3 | 149 | m4_divert(80)m4_dnl |
bfdc045d MW |
150 | ###-------------------------------------------------------------------------- |
151 | ### Special forwarding exemptions. | |
152 | ||
78af294c MW |
153 | case $forward in |
154 | 1) | |
155 | ||
156 | ## Only allow these packets if they're not fragmented. (Don't trust safe | |
157 | ## hosts's fragment reassembly to be robust against malicious fragments.) | |
158 | ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning | |
159 | ## of `! -f', so we do the negation using early return from a subchain. | |
160 | clearchain fwd-spec-nofrag | |
161 | run iptables -A fwd-spec-nofrag -j RETURN --fragment | |
162 | run ip6tables -A fwd-spec-nofrag -j RETURN \ | |
163 | -m ipv6header --soft --header frag | |
164 | run iptables -A FORWARD -j fwd-spec-nofrag | |
165 | ||
166 | ## Allow ping from safe/noloop to untrusted networks. | |
167 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
168 | -p icmp --icmp-type echo-request \ | |
169 | -m mark --mark $to_untrusted/$MASK_TO | |
170 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
171 | -p icmp --icmp-type echo-reply \ | |
172 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
173 | -m state --state ESTABLISHED | |
174 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
175 | -p ipv6-icmp --icmpv6-type echo-request \ | |
176 | -m mark --mark $to_untrusted/$MASK_TO | |
177 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
178 | -p ipv6-icmp --icmpv6-type echo-reply \ | |
179 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
180 | -m state --state ESTABLISHED | |
181 | ||
182 | ## Allow SSH from safe/noloop to untrusted networks. | |
183 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
184 | -p tcp --destination-port $port_ssh \ | |
185 | -m mark --mark $to_untrusted/$MASK_TO | |
186 | run iptables -A fwd-spec-nofrag -j ACCEPT \ | |
187 | -p tcp --source-port $port_ssh \ | |
188 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
189 | -m state --state ESTABLISHED | |
190 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
191 | -p tcp --destination-port $port_ssh \ | |
192 | -m mark --mark $to_untrusted/$MASK_TO | |
193 | run ip6tables -A fwd-spec-nofrag -j ACCEPT \ | |
194 | -p tcp --source-port $port_ssh \ | |
195 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
196 | -m state --state ESTABLISHED | |
197 | ||
198 | ;; | |
199 | esac | |
200 | ||
a4d8cae3 | 201 | m4_divert(80)m4_dnl |
ade2c052 MW |
202 | ###-------------------------------------------------------------------------- |
203 | ### Kill things we don't understand properly. | |
204 | ### | |
205 | ### I don't like having to do this, but since I don't know how to do proper | |
206 | ### multicast filtering, I'm just going to ban it from being forwarded. | |
207 | ||
208 | errorchain poorly-understood REJECT | |
209 | ||
210 | ## Ban multicast destination addresses in forwarding. | |
78af294c MW |
211 | case $forward in |
212 | 1) | |
213 | run iptables -A FORWARD -g poorly-understood \ | |
214 | -d 224.0.0.0/4 | |
215 | run ip6tables -A FORWARD -g poorly-understood \ | |
216 | -d ff::/8 | |
217 | ;; | |
218 | esac | |
ade2c052 | 219 | |
a4d8cae3 | 220 | m4_divert(84)m4_dnl |
bfdc045d MW |
221 | ###-------------------------------------------------------------------------- |
222 | ### Locally-bound packet inspection. | |
223 | ||
224 | clearchain inbound | |
225 | ||
226 | ## Track connections. | |
ecdca131 | 227 | commonrules inbound |
bfdc045d MW |
228 | conntrack inbound |
229 | ||
230 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
231 | ## local request. | |
232 | run iptables -A inbound -j ACCEPT \ | |
233 | -s 0.0.0.0 -d 255.255.255.255 \ | |
234 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
235 | run iptables -A inbound -j ACCEPT \ | |
236 | -s 172.29.198.0/23 \ | |
237 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
238 | ||
08926d25 MW |
239 | ## Incoming multicast on a network interface associated with a trusted |
240 | ## network is OK, since it must have originated there (or been forwarded, but | |
241 | ## we don't do that yet). | |
fc489c16 MW |
242 | seen=:-: |
243 | for net in $allnets; do | |
244 | eval class=\$net_class_$net | |
245 | case $class in trusted) ;; *) continue ;; esac | |
246 | for iface in $(net_interfaces FWHOST $net); do | |
247 | case "$seen" in *:$iface:*) continue ;; esac | |
248 | seen=$seen$iface: | |
08926d25 | 249 | run iptables -A inbound -j ACCEPT \ |
429f4314 | 250 | -s 0.0.0.0 -d 224.0.0.0/24 \ |
fc489c16 | 251 | -i $iface |
08926d25 | 252 | done |
fc489c16 | 253 | done |
429f4314 | 254 | |
bfdc045d | 255 | ## Allow incoming ping. This is the only ICMP left. |
0291d6d5 | 256 | run ip46tables -A inbound -j ACCEPT -p icmp |
bfdc045d MW |
257 | |
258 | m4_divert(88)m4_dnl | |
259 | ## Allow unusual things. | |
260 | openports inbound | |
261 | ||
262 | ## Inspect inbound packets from untrusted sources. | |
0291d6d5 MW |
263 | run ip46tables -A inbound -j forbidden |
264 | run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound | |
bfdc045d MW |
265 | |
266 | ## Otherwise process as indicated by the mark. | |
f0033e07 MW |
267 | for i in $inchains; do |
268 | run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT | |
269 | done | |
bfdc045d MW |
270 | |
271 | m4_divert(-1) | |
272 | ###----- That's all, folks -------------------------------------------------- |