mdw@git.distorted.org.uk Git - firewall/blob - radius.m4

   1 ### -*-sh-*-
   2 ###
   3 ### Firewall configuration for radius
   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 ### radius-specific rules.
  26
  27 m4_divert(86)m4_dnl
  28 ## Externally visible services.
  29 allowservices inbound tcp \
  30         ident \
  31         ssh
  32 allowservices inbound udp \
  33         tripe
  34
  35 ## Provide syslog for evolution.
  36 run iptables -A inbound -j ACCEPT \
  37         -s 172.29.198.2 \
  38         -p udp --destination-port $port_syslog
  39
  40 ## Other interesting things.
  41 dnsresolver inbound
  42 dnsserver inbound
  43
  44 ## IPv6 6-in-4 tunnel.
  45 run iptables -A inbound -j ACCEPT \
  46         -p $proto_ipv6 -s 216.66.80.26
  47
  48 ## Permitted special forwarding.
  49 makeset fwd-allow-http nethash || :
  50 iptables -A fwd-spec-nofrag -j ACCEPT \
  51         -m set --match-set fwd-allow-http dst \
  52         -p tcp --destination-port $port_http \
  53         -m mark --mark $to_untrusted/$MASK_TO
  54 iptables -A fwd-spec-nofrag -j ACCEPT \
  55         -m set --match-set fwd-allow-http src \
  56         -p tcp --destination-port $port_http \
  57         -m mark --mark $from_untrusted/$MASK_FROM \
  58         -m state --state ESTABLISHED
  59
  60 ## BCP38 filtering.  Note that addresses here are seen before NAT is applied.
  61 bcp38 4 ppp0 62.49.204.144/28 172.29.198.0/23
  62 bcp38 6 t6-he \
  63         2001:470:1f08:1b98::2 2001:470:1f09:1b98::/64 \
  64         2001:470:9740::/48
  65
  66 ## NAT for RFC1918 addresses.
  67 for i in PREROUTING OUTPUT POSTROUTING; do
  68   run iptables -t nat -P $i ACCEPT 2>/dev/null || :
  69   run iptables -t nat -F $i 2>/dev/null || :
  70 done
  71 run iptables -t nat -F
  72 run iptables -t nat -X
  73
  74 run iptables -t nat -N outbound
  75 run iptables -t nat -A outbound -j RETURN ! -o ppp0
  76 run iptables -t nat -A outbound -j RETURN ! -s 172.29.198.0/23
  77 run iptables -t nat -A outbound -j RETURN -d 62.49.204.144/28
  78 run iptables -t nat -A outbound -j RETURN -d 172.29.198.0/23
  79
  80 ## An awful hack.
  81 ##run iptables -t nat -A outbound -j DNETMAP --reuse \
  82 ##      -s 172.29.199.44 --prefix 62.49.204.157
  83 ##run iptables -t nat -A outbound -j DNETMAP --reuse \
  84 ##      -s 172.29.198.34 --prefix 62.49.204.157
  85 ##run iptables -t nat -A outbound -j DNETMAP --reuse \
  86 ##      -s 172.29.198.11 --prefix 62.49.204.157
  87 ##run iptables -t nat -A PREROUTING -j DNETMAP
  88
  89 run iptables -t nat -A outbound -j SNAT --to-source 62.49.204.158
  90 run iptables -t nat -A POSTROUTING -j outbound
  91
  92 ## Set up NAT protocol helpers.  In particular, SIP needs some special
  93 ## twiddling.
  94 run modprobe nf_conntrack_sip \
  95   ports=5060 \
  96   sip_direct_signalling=0 \
  97   sip_direct_media=0
  98 for p in ftp sip h323; do
  99   run modprobe nf_nat_$p
 100 done
 101
 102 ## Forbid anything complicated to the NAT address.  Be sure to allow ident,
 103 ## though.
 104 run iptables -A INPUT -d 62.49.204.158 -p tcp -j ACCEPT \
 105         -m multiport --destination-ports=113
 106 run iptables -A INPUT -d 62.49.204.158 ! -p icmp -j REJECT
 107
 108 m4_divert(-1)
 109 ###----- That's all, folks --------------------------------------------------