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_IPSEC="true"
  56 HAVE_OPENVPN="true"
  57
  58 # INPUT
  59
  60 # IPsec INPUT
  61 case "${HAVE_IPSEC},${POLICY}" in
  62         true,MODE1) ;;
  63         true,*)
  64                 iptables -A POLICYIN -m policy --pol ipsec --dir in -j ACCEPT
  65                 ;;
  66 esac
  67
  68 # OpenVPN INPUT
  69 # Allow direct access to the internal IP addresses of the firewall
  70 # from remote subnets if forward policy is allowed.
  71 case "${HAVE_OPENVPN},${POLICY}" in
  72         true,MODE1) ;;
  73         true,*)
  74                 iptables -A POLICYIN -i tun+ -j ACCEPT
  75                 ;;
  76 esac
  77
  78 case "${FWPOLICY2}" in
  79         REJECT)
  80                 if [ "${DROPINPUT}" = "on" ]; then
  81                         iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "REJECT_INPUT "
  82                 fi
  83                 iptables -A POLICYIN -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_INPUT"
  84                 ;;
  85         *) # DROP
  86                 if [ "${DROPINPUT}" = "on" ]; then
  87                         iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
  88                 fi
  89                 iptables -A POLICYIN -j DROP -m comment --comment "DROP_INPUT"
  90                 ;;
  91 esac
  92
  93 # FORWARD
  94 case "${POLICY}" in
  95         MODE1)
  96                 case "${FWPOLICY}" in
  97                         REJECT)
  98                                 if [ "${DROPFORWARD}" = "on" ]; then
  99                                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "REJECT_FORWARD "
 100                                 fi
 101                                 iptables -A POLICYFWD -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_FORWARD"
 102                                 ;;
 103                         *) # DROP
 104                                 if [ "${DROPFORWARD}" = "on" ]; then
 105                                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
 106                                 fi
 107                                 iptables -A POLICYFWD -j DROP -m comment --comment "DROP_FORWARD"
 108                                 ;;
 109                 esac
 110                 ;;
 111
 112         *)
 113                 # Access from GREEN is granted to everywhere
 114                 iptables -A POLICYFWD -i "${GREEN_DEV}" -s "${GREEN_NETADDRESS}/${GREEN_NETMASK}" -j ACCEPT
 115
 116                 # Grant access for IPsec VPN connections
 117                 iptables -A POLICYFWD -m policy --pol ipsec --dir in -j ACCEPT
 118
 119                 # Grant access for OpenVPN connections
 120                 iptables -A POLICYFWD -i tun+ -j ACCEPT
 121
 122                 if [ -n "${IFACE}" ]; then
 123                         if [ "${HAVE_BLUE}" = "true" ] && [ -n "${BLUE_DEV}" ]; then
 124                                 iptables -A POLICYFWD -i "${BLUE_DEV}" -s "${BLUE_NETADDRESS}/${BLUE_NETMASK}" -o "${IFACE}" -j ACCEPT
 125                         fi
 126
 127                         if [ "${HAVE_ORANGE}" = "true" ] && [ -n "${ORANGE_DEV}" ]; then
 128                                 iptables -A POLICYFWD -i "${ORANGE_DEV}" -s "${ORANGE_NETADDRESS}/${ORANGE_NETMASK}" -o "${IFACE}" -j ACCEPT
 129                         fi
 130                 fi
 131
 132                 if [ "${DROPFORWARD}" = "on" ]; then
 133                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
 134                 fi
 135                 iptables -A POLICYFWD -m comment --comment "DROP_FORWARD" -j DROP
 136                 ;;
 137 esac
 138
 139 # OUTGOING
 140 case "${POLICY1}" in
 141         MODE1)
 142                 case "${FWPOLICY1}" in
 143                         REJECT)
 144                                 if [ "${DROPOUTGOING}" = "on" ]; then
 145                                         iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "REJECT_OUTPUT "
 146                                 fi
 147                                 iptables -A POLICYOUT -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_OUTPUT"
 148                                 ;;
 149                         *) # DROP
 150                                 if [ "${DROPOUTGOING}" == "on" ]; then
 151                                         iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
 152                                 fi
 153                                 iptables -A POLICYOUT -j DROP -m comment --comment "DROP_OUTPUT"
 154                                 ;;
 155                 esac
 156                 ;;
 157         *)
 158                 iptables -A POLICYOUT -j ACCEPT
 159                 iptables -A POLICYOUT -m comment --comment "DROP_OUTPUT" -j DROP
 160                 ;;
 161 esac
 162
 163 exit 0