| 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 -------------------------------------------------- |