config/firewall/firewall-policy

   1 #!/bin/sh
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2013 Alexander Marx <amarx@ipfire.org>                        #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
  23 eval $(/usr/local/bin/readhash /var/ipfire/firewall/settings)
  24 eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
  25
  26 function iptables() {
  27         /sbin/iptables --wait "$@"
  28 }
  29
  30 iptables -F POLICYFWD
  31 iptables -F POLICYOUT
  32 iptables -F POLICYIN
  33
  34 if [ -f "/var/ipfire/red/iface" ]; then
  35         IFACE="$(</var/ipfire/red/iface)"
  36 fi
  37
  38 # Figure out what devices are configured.
  39 HAVE_BLUE="false"
  40 HAVE_ORANGE="false"
  41
  42 case "${CONFIG_TYPE}" in
  43         2)
  44                 HAVE_ORANGE="true"
  45                 ;;
  46         3)
  47                 HAVE_BLUE="true"
  48                 ;;
  49         4)
  50                 HAVE_BLUE="true"
  51                 HAVE_ORANGE="true"
  52                 ;;
  53 esac
  54
  55 HAVE_OPENVPN="true"
  56
  57 # INPUT
  58
  59 # OpenVPN INPUT
  60 # Allow direct access to the internal IP addresses of the firewall
  61 # from remote subnets if forward policy is allowed.
  62 case "${HAVE_OPENVPN},${POLICY}" in
  63         true,MODE1) ;;
  64         true,*)
  65                 iptables -A POLICYIN -i tun+ -j ACCEPT
  66                 ;;
  67 esac
  68
  69 case "${FWPOLICY2}" in
  70         REJECT)
  71                 if [ "${DROPINPUT}" = "on" ]; then
  72                         iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "REJECT_INPUT "
  73                 fi
  74                 iptables -A POLICYIN -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_INPUT"
  75                 ;;
  76         *) # DROP
  77                 if [ "${DROPINPUT}" = "on" ]; then
  78                         iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
  79                 fi
  80                 iptables -A POLICYIN -j DROP -m comment --comment "DROP_INPUT"
  81                 ;;
  82 esac
  83
  84 # FORWARD
  85 case "${POLICY}" in
  86         MODE1)
  87                 case "${FWPOLICY}" in
  88                         REJECT)
  89                                 if [ "${DROPFORWARD}" = "on" ]; then
  90                                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "REJECT_FORWARD "
  91                                 fi
  92                                 iptables -A POLICYFWD -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_FORWARD"
  93                                 ;;
  94                         *) # DROP
  95                                 if [ "${DROPFORWARD}" = "on" ]; then
  96                                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
  97                                 fi
  98                                 iptables -A POLICYFWD -j DROP -m comment --comment "DROP_FORWARD"
  99                                 ;;
 100                 esac
 101                 ;;
 102
 103         *)
 104                 if [ -n "${IFACE}" ]; then
 105                         if [ "${HAVE_BLUE}" = "true" ] && [ -n "${BLUE_DEV}" ]; then
 106                                 iptables -A POLICYFWD -i "${BLUE_DEV}" ! -o "${IFACE}" -j DROP
 107                         fi
 108                         if [ "${HAVE_ORANGE}" = "true" ] && [ -n "${ORANGE_DEV}" ]; then
 109                                 iptables -A POLICYFWD -i "${ORANGE_DEV}" ! -o "${IFACE}" -j DROP
 110                         fi
 111                 fi
 112                 iptables -A POLICYFWD -j ACCEPT
 113                 iptables -A POLICYFWD -m comment --comment "DROP_FORWARD" -j DROP
 114                 ;;
 115 esac
 116
 117 # OUTGOING
 118 case "${POLICY1}" in
 119         MODE1)
 120                 case "${FWPOLICY1}" in
 121                         REJECT)
 122                                 if [ "${DROPOUTGOING}" = "on" ]; then
 123                                         iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "REJECT_OUTPUT "
 124                                 fi
 125                                 iptables -A POLICYOUT -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_OUTPUT"
 126                                 ;;
 127                         *) # DROP
 128                                 if [ "${DROPOUTGOING}" == "on" ]; then
 129                                         iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
 130                                 fi
 131                                 iptables -A POLICYOUT -j DROP -m comment --comment "DROP_OUTPUT"
 132                                 ;;
 133                 esac
 134                 ;;
 135         *)
 136                 iptables -A POLICYOUT -j ACCEPT
 137                 iptables -A POLICYOUT -m comment --comment "DROP_OUTPUT" -j DROP
 138                 ;;
 139 esac
 140
 141 exit 0