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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 $ntp_servers | |
35 | ||
f052839b MW |
36 | ## Provide NTP service to untrusted clients. |
37 | iptables -A inbound -p udp -j ACCEPT \ | |
38 | --source-port 123 --destination-port 123 \ | |
39 | -s 172.29.198.0/23 | |
40 | ip6tables -A inbound -p udp -j ACCEPT \ | |
41 | --source-port 123 --destination-port 123 \ | |
42 | -s 2001:470:9740::/48 | |
43 | ||
e35b80fa MW |
44 | ## Guaranteed black hole. Put this at the very front of the chain. |
45 | run iptables -I INPUT -d 212.13.198.78 -j DROP | |
46 | run ip6tables -I INPUT -d 2001:ba8:0:1d9::ffff -j DROP | |
47 | ||
e7de4e98 MW |
48 | ## Ethernet bridge-level filtering for source addresses. |
49 | run ebtables -F | |
8f58d37f MW |
50 | for i in log limit ip ip6; do run modprobe ebt-$i; done |
51 | ||
4782bcca | 52 | for c in bad-source-addr check-eth0 bcp38 check-bcp38; do |
e7de4e98 MW |
53 | run ebtables -X $c >/dev/null 2>&1 || : |
54 | done | |
8f58d37f | 55 | |
4782bcca MW |
56 | for ch in bad-source-addr bcp38; do |
57 | run ebtables -N $ch | |
58 | run ebtables -A $ch \ | |
59 | --limit 20/second --limit-burst 100 \ | |
60 | --log-prefix "fw: $ch(br)" --log-ip --log-ip6 | |
61 | run ebtables -A $ch -j DROP | |
62 | done | |
8f58d37f | 63 | |
e7de4e98 MW |
64 | run ebtables -N check-eth0 |
65 | run ebtables -A check-eth0 -j RETURN -p ip --ip-source ! 212.13.198.64/28 | |
66 | run ebtables -A check-eth0 -j RETURN -p ip6 --ip6-source 2001:ba8:0:1d9::1 | |
67 | run ebtables -A check-eth0 -j bad-source-addr \ | |
68 | -p ip6 --ip6-source 2001:ba8:1d9::/48 | |
69 | run ebtables -A check-eth0 -j bad-source-addr \ | |
70 | -p ip6 --ip6-source 2001:ba8:0:1d9::/64 | |
71 | run ebtables -A check-eth0 -j RETURN -p ip6 | |
72 | run ebtables -A check-eth0 -j RETURN -p ip --ip-source 212.13.198.64/30 | |
73 | run ebtables -A check-eth0 -j RETURN -p ip --ip-source 212.13.198.68 | |
74 | run ebtables -A check-eth0 -j bad-source-addr -p ip | |
75 | run ebtables -A INPUT -j check-eth0 -i bond0 | |
76 | run ebtables -A FORWARD -j check-eth0 -i bond0 | |
77 | ||
4782bcca MW |
78 | run ebtables -N check-bcp38 |
79 | run ebtables -A check-bcp38 -j RETURN -p ip --ip-source 212.13.198.64/28 | |
80 | run ebtables -A check-bcp38 -j bcp38 -p ip | |
81 | run ebtables -A check-bcp38 -j RETURN -p ip6 --ip6-source 2001:ba8:0:1d9::/64 | |
82 | run ebtables -A check-bcp38 -j RETURN -p ip6 --ip6-source 2001:ba8:1d9::/48 | |
83 | run ebtables -A check-bcp38 -j RETURN -p ip6 --ip6-source fe80::/10 | |
84 | run ebtables -A check-bcp38 -j bcp38 -p ip6 | |
85 | run ebtables -A FORWARD -j check-bcp38 -o bond0 | |
86 | ||
87 | ## There's a hideous bug in Linux' 3.2.51-1's ebtables: for some reason it | |
88 | ## misparses (at least) locally originated multicast packets, and tries to | |
89 | ## extract IP header fields relative to the start of the Ethernet frame. The | |
90 | ## result is obviously a hideous mess. Don't try to do BCP38 checking for | |
91 | ## locally originated packets until this is fixed. | |
92 | ##run ebtables -A OUTPUT -j check-bcp38 -o bond0 | |
93 | ||
b5aae782 MW |
94 | m4_divert(-1) |
95 | ###----- That's all, folks -------------------------------------------------- |