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 # Allow access from GREEN
  61 iptables -A POLICYIN -i "${GREEN_DEV}" -j ACCEPT
  62
  63 # IPsec INPUT
  64 case "${HAVE_IPSEC},${POLICY}" in
  65         true,MODE1) ;;
  66         true,*)
  67                 iptables -A POLICYIN -m policy --pol ipsec --dir in -j ACCEPT
  68                 ;;
  69 esac
  70
  71 # OpenVPN INPUT
  72 # Allow direct access to the internal IP addresses of the firewall
  73 # from remote subnets if forward policy is allowed.
  74 case "${HAVE_OPENVPN},${POLICY}" in
  75         true,MODE1) ;;
  76         true,*)
  77                 iptables -A POLICYIN -i tun+ -j ACCEPT
  78                 ;;
  79 esac
  80
  81 case "${FWPOLICY2}" in
  82         REJECT)
  83                 if [ "${DROPINPUT}" = "on" ]; then
  84                         iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "REJECT_INPUT "
  85                 fi
  86                 iptables -A POLICYIN -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_INPUT"
  87                 ;;
  88         *) # DROP
  89                 if [ "${DROPINPUT}" = "on" ]; then
  90                         iptables -A POLICYIN -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
  91                 fi
  92                 iptables -A POLICYIN -j DROP -m comment --comment "DROP_INPUT"
  93                 ;;
  94 esac
  95
  96 # FORWARD
  97 case "${POLICY}" in
  98         MODE1)
  99                 case "${FWPOLICY}" in
 100                         REJECT)
 101                                 if [ "${DROPFORWARD}" = "on" ]; then
 102                                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "REJECT_FORWARD "
 103                                 fi
 104                                 iptables -A POLICYFWD -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_FORWARD"
 105                                 ;;
 106                         *) # DROP
 107                                 if [ "${DROPFORWARD}" = "on" ]; then
 108                                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
 109                                 fi
 110                                 iptables -A POLICYFWD -j DROP -m comment --comment "DROP_FORWARD"
 111                                 ;;
 112                 esac
 113                 ;;
 114
 115         *)
 116                 # Access from GREEN is granted to everywhere
 117                 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
 118                         # internet via green
 119                         # don't check source IP/NET if IFACE is GREEN
 120                         iptables -A POLICYFWD -i "${GREEN_DEV}" -j ACCEPT
 121                 else
 122                         iptables -A POLICYFWD -i "${GREEN_DEV}" -s "${GREEN_NETADDRESS}/${GREEN_NETMASK}" -j ACCEPT
 123                 fi
 124
 125                 # Grant access for IPsec VPN connections
 126                 iptables -A POLICYFWD -m policy --pol ipsec --dir in -j ACCEPT
 127
 128                 # Grant access for OpenVPN connections
 129                 iptables -A POLICYFWD -i tun+ -j ACCEPT
 130
 131                 if [ -n "${IFACE}" ]; then
 132                         if [ "${HAVE_BLUE}" = "true" ] && [ -n "${BLUE_DEV}" ]; then
 133                                 iptables -A POLICYFWD -i "${BLUE_DEV}" -s "${BLUE_NETADDRESS}/${BLUE_NETMASK}" -o "${IFACE}" -j ACCEPT
 134                         fi
 135
 136                         if [ "${HAVE_ORANGE}" = "true" ] && [ -n "${ORANGE_DEV}" ]; then
 137                                 iptables -A POLICYFWD -i "${ORANGE_DEV}" -s "${ORANGE_NETADDRESS}/${ORANGE_NETMASK}" -o "${IFACE}" -j ACCEPT
 138                         fi
 139                 fi
 140
 141                 if [ "${DROPFORWARD}" = "on" ]; then
 142                         iptables -A POLICYFWD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD "
 143                 fi
 144                 iptables -A POLICYFWD -m comment --comment "DROP_FORWARD" -j DROP
 145                 ;;
 146 esac
 147
 148 # OUTGOING
 149 case "${POLICY1}" in
 150         MODE1)
 151                 case "${FWPOLICY1}" in
 152                         REJECT)
 153                                 if [ "${DROPOUTGOING}" = "on" ]; then
 154                                         iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "REJECT_OUTPUT "
 155                                 fi
 156                                 iptables -A POLICYOUT -j REJECT --reject-with icmp-host-unreachable -m comment --comment "DROP_OUTPUT"
 157                                 ;;
 158                         *) # DROP
 159                                 if [ "${DROPOUTGOING}" == "on" ]; then
 160                                         iptables -A POLICYOUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
 161                                 fi
 162                                 iptables -A POLICYOUT -j DROP -m comment --comment "DROP_OUTPUT"
 163                                 ;;
 164                 esac
 165                 ;;
 166         *)
 167                 iptables -A POLICYOUT -j ACCEPT
 168                 iptables -A POLICYOUT -m comment --comment "DROP_OUTPUT" -j DROP
 169                 ;;
 170 esac
 171
 172 exit 0