~mdw / firewall / blame
| Commit | Line | Data |
|---|---|---|
| bfdc045d MW |
1 | ### -*-m4-*- |
| 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 | ###-------------------------------------------------------------------------- | |
| 25 | ### Packet classification. | |
| 26 | ||
| 27 | ## Define the available network classes. | |
| 28 | m4_divert(42)m4_dnl | |
| 29 | defnetclass untrusted untrusted trusted | |
| 30 | defnetclass trusted untrusted trusted safe noloop | |
| 31 | defnetclass safe trusted safe noloop | |
| 32 | defnetclass noloop trusted safe | |
| 33 | m4_divert(-1)m4_dnl | |
| 34 | ||
| 35 | ###-------------------------------------------------------------------------- | |
| 36 | ### Network layout. | |
| 37 | ||
| 38 | m4_divert(46)m4_dnl | |
| 39 | ## Networks and routing. | |
| 40 | ||
| 41 | defiface $if_trusted \ | |
| 42 | trusted:172.29.199.0/26 \ | |
| 43 | safe:172.29.199.64/27 \ | |
| 44 | untrusted:default | |
| 45 | defiface $if_untrusted \ | |
| 46 | untrusted:172.29.198.0/24 | |
| 47 | defvpn $if_vpn safe 172.29.199.128/27 \ | |
| 48 | crybaby:172.29.199.129 | |
| 49 | defiface $if_its_mz safe:172.29.199.160/30 | |
| 50 | defiface $if_its_pi safe:192.168.0.0/24 | |
| 51 | ||
| 52 | m4_divert(60)m4_dnl | |
| 53 | ###-------------------------------------------------------------------------- | |
| 54 | ### Special forwarding exemptions. | |
| 55 | ||
| 56 | ## Allow ping from safe/noloop to untrusted networks. | |
| 57 | run iptables -A FORWARD -j ACCEPT \ | |
| 58 | -p icmp --icmp-type echo-request \ | |
| 59 | -m mark --mark $to_untrusted/$MASK_TO | |
| 60 | run iptables -A FORWARD -j ACCEPT \ | |
| 61 | -p icmp --icmp-type echo-reply \ | |
| 62 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
| 63 | -m state --state ESTABLISHED | |
| 64 | ||
| 65 | ## Allow SSH from safe/noloop to untrusted networks. | |
| 66 | run iptables -A FORWARD -j ACCEPT \ | |
| 67 | -p tcp --destination-port $port_ssh \ | |
| 68 | -m mark --mark $to_untrusted/$MASK_TO | |
| 69 | run iptables -A FORWARD -j ACCEPT \ | |
| 70 | -p tcp --source-port $port_ssh \ | |
| 71 | -m mark --mark $from_untrusted/$MASK_FROM \ | |
| 72 | -m state --state ESTABLISHED | |
| 73 | ||
| 74 | m4_divert(80)m4_dnl | |
| 75 | ###-------------------------------------------------------------------------- | |
| 76 | ### Locally-bound packet inspection. | |
| 77 | ||
| 78 | clearchain inbound | |
| 79 | ||
| 80 | ## Track connections. | |
| 81 | conntrack inbound | |
| 82 | ||
| 83 | ## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a | |
| 84 | ## local request. | |
| 85 | run iptables -A inbound -j ACCEPT \ | |
| 86 | -s 0.0.0.0 -d 255.255.255.255 \ | |
| 87 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
| 88 | run iptables -A inbound -j ACCEPT \ | |
| 89 | -s 172.29.198.0/23 \ | |
| 90 | -p udp --source-port $port_bootpc --destination-port $port_bootps | |
| 91 | ||
| 92 | ## Allow incoming ping. This is the only ICMP left. | |
| 93 | run iptables -A inbound -j ACCEPT -p icmp | |
| 94 | ||
| 95 | m4_divert(88)m4_dnl | |
| 96 | ## Allow unusual things. | |
| 97 | openports inbound | |
| 98 | ||
| 99 | ## Inspect inbound packets from untrusted sources. | |
| 100 | run iptables -A inbound -j forbidden | |
| 101 | run iptables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound | |
| 102 | ||
| 103 | ## Otherwise process as indicated by the mark. | |
| 104 | for i in INPUT FORWARD; do | |
| 105 | run iptables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT | |
| 106 | done | |
| 107 | ||
| 108 | m4_divert(-1) | |
| 109 | ###----- That's all, folks -------------------------------------------------- |