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b5aae782 MW |
1 | ### -*-sh-*- |
2 | ### | |
3 | ### Firewall configuration for fender actual | |
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 | ###-------------------------------------------------------------------------- | |
b5aae782 MW |
25 | ### fender-specific rules. |
26 | ||
1a42af95 | 27 | m4_divert(86)m4_dnl |
b5aae782 MW |
28 | ## Externally visible services. |
29 | allowservices inbound tcp \ | |
30 | ssh \ | |
31 | ident | |
32 | ||
33 | ## We have to provide NTP service. The guests sync to our clock. | |
34 | ntpclient inbound $ntp_servers | |
35 | ||
f052839b | 36 | ## Provide NTP service to untrusted clients. |
94ce6e76 MW |
37 | run ip46tables -A inbound-untrusted -p udp -j ACCEPT \ |
38 | --source-port 123 --destination-port 123 | |
f052839b | 39 | |
e35b80fa | 40 | ## Guaranteed black hole. Put this at the very front of the chain. |
ddbe1eaa MW |
41 | run iptables -I INPUT -d 217.169.12.78 -j DROP |
42 | run ip6tables -I INPUT -d 2001:8b0:c92:fff::ffff -j DROP | |
e35b80fa | 43 | |
e7de4e98 MW |
44 | ## Ethernet bridge-level filtering for source addresses. |
45 | run ebtables -F | |
8f58d37f MW |
46 | for i in log limit ip ip6; do run modprobe ebt-$i; done |
47 | ||
4782bcca | 48 | for c in bad-source-addr check-eth0 bcp38 check-bcp38; do |
e7de4e98 MW |
49 | run ebtables -X $c >/dev/null 2>&1 || : |
50 | done | |
8f58d37f | 51 | |
4782bcca MW |
52 | for ch in bad-source-addr bcp38; do |
53 | run ebtables -N $ch | |
54 | run ebtables -A $ch \ | |
55 | --limit 20/second --limit-burst 100 \ | |
56 | --log-prefix "fw: $ch(br)" --log-ip --log-ip6 | |
57 | run ebtables -A $ch -j DROP | |
58 | done | |
8f58d37f | 59 | |
4782bcca | 60 | run ebtables -N check-bcp38 |
ddbe1eaa MW |
61 | run ebtables -A check-bcp38 -j RETURN -p ip --ip-source 81.187.238.128/28 |
62 | run ebtables -A check-bcp38 -j RETURN -p ip --ip-source 217.169.12.64/28 | |
4782bcca | 63 | run ebtables -A check-bcp38 -j bcp38 -p ip |
ddbe1eaa | 64 | run ebtables -A check-bcp38 -j RETURN -p ip6 --ip6-source 2001:8b0:c92::/48 |
4782bcca MW |
65 | run ebtables -A check-bcp38 -j RETURN -p ip6 --ip6-source 2001:ba8:1d9::/48 |
66 | run ebtables -A check-bcp38 -j RETURN -p ip6 --ip6-source fe80::/10 | |
67 | run ebtables -A check-bcp38 -j bcp38 -p ip6 | |
ddbe1eaa | 68 | run ebtables -A FORWARD -j check-bcp38 -o br-dmz |
4782bcca | 69 | |
da36fc7d | 70 | ## There's a hideous bug in Linux 3.2.51-1's ebtables: for some reason it |
4782bcca MW |
71 | ## misparses (at least) locally originated multicast packets, and tries to |
72 | ## extract IP header fields relative to the start of the Ethernet frame. The | |
73 | ## result is obviously a hideous mess. Don't try to do BCP38 checking for | |
74 | ## locally originated packets until this is fixed. | |
75 | ##run ebtables -A OUTPUT -j check-bcp38 -o bond0 | |
76 | ||
b5aae782 MW |
77 | m4_divert(-1) |
78 | ###----- That's all, folks -------------------------------------------------- |