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https://github.com/vincentmli/bpfire.git
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053a582d3a
This is not necessary and gets in the way if users have SNAT rules or other things that make the check be in the wrong place. Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
131 lines
3.8 KiB
Bash
131 lines
3.8 KiB
Bash
#!/bin/bash
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###############################################################################
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# #
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# IPFire.org - A linux based firewall #
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# Copyright (C) 2015 IPFire Team #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <http://www.gnu.org/licenses/>. #
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# #
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###############################################################################
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VPN_CONFIG="/var/ipfire/vpn/config"
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eval $(/usr/local/bin/readhash /var/ipfire/vpn/settings)
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VARS=(
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id status name lefthost type ctype psk local local_id leftsubnets
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remote_id remote rightsubnets x3 x4 x5 x6 x7 x8 x9 x10 x11 x12
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x13 x14 x15 x16 x17 x18 x19 proto x20 x21 x22
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route x23 mode interface_mode interface_address interface_mtu rest
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)
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block_subnet() {
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local subnet="${1}"
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local action="${2}"
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# Nothing to be done if no action is requested
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if [ "${action}" = "none" ]; then
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return 0
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fi
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# Don't block a wildcard subnet
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if [ "${subnet}" = "0.0.0.0/0" ] || [ "${subnet}" = "0.0.0.0/0.0.0.0" ]; then
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return 0
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fi
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case "${action}" in
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reject)
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iptables -A IPSECBLOCK -d "${subnet}" -j REJECT --reject-with icmp-net-unreachable
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;;
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drop)
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iptables -A IPSECBLOCK -d "${subnet}" -j DROP
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;;
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*)
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return 1
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;;
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esac
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return 0
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}
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install_policy() {
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# Flush existing rules
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iptables -F IPSECINPUT
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iptables -F IPSECOUTPUT
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iptables -F IPSECBLOCK
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# We are done when IPsec is not enabled
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[ "${ENABLED}" = "on" ] || exit 0
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# IKE
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iptables -A IPSECINPUT -p udp --dport 500 -j ACCEPT
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iptables -A IPSECOUTPUT -p udp --dport 500 -j ACCEPT
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# IKE NAT
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iptables -A IPSECINPUT -p udp --dport 4500 -j ACCEPT
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iptables -A IPSECOUTPUT -p udp --dport 4500 -j ACCEPT
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# Register local variables
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local "${VARS[@]}"
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local action
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while IFS="," read -r "${VARS[@]}"; do
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# Check if the connection is enabled
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[ "${status}" = "on" ] || continue
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# Check if this a net-to-net connection
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[ "${type}" = "net" ] || continue
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# Default local to 0.0.0.0/0
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if [ "${local}" = "" -o "${local}" = "off" ]; then
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local="0.0.0.0/0"
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fi
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# Install permissions for GRE traffic
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case "${interface_mode}" in
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gre)
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if [ -n "${remote}" ]; then
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iptables -A IPSECINPUT -p gre \
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-s "${remote}" -d "${local}" -j ACCEPT
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iptables -A IPSECOUTPUT -p gre \
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-s "${local}" -d "${remote}" -j ACCEPT
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fi
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;;
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esac
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# Install firewall rules only for interfaces without interface
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[ -n "${interface_mode}" ] && continue
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# Split multiple subnets
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rightsubnets="${rightsubnets//\|/ }"
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case "${route}" in
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route)
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action="none"
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;;
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*)
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action="reject"
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;;
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esac
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local rightsubnet
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for rightsubnet in ${rightsubnets}; do
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block_subnet "${rightsubnet}" "${action}"
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done
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done < "${VPN_CONFIG}"
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}
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install_policy || exit $?
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