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https://github.com/vincentmli/bpfire.git
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80fbd89949
If an IPsec VPN connections is not established, there are rare cases when packets are supposed to be sent through that said tunnel and incorrectly handled. Those packets are sent to the default gateway an entry for this connection is created in the connection tracking table (usually only happens to UDP). All following packets are sent the same route even after the tunnel has been brought up. That leads to SIP phones not being able to register among other things. This patch adds firewall rules that these packets are rejected. That will sent a notification to the client that the tunnel is not up and avoid the connection to be added to the connection tracking table. Apart from a small performance penalty there should be no other side-effects. Fixes: #10908 Signed-off-by: Michael Tremer <michael.tremer@ipfire.org> Cc: tomvend@rymes.com Cc: daniel.weismueller@ipfire.org Cc: morlix@morlix.de Reviewed-by: Timo Eissler <timo.eissler@ipfire.org>
60 lines
2.5 KiB
Bash
60 lines
2.5 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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block_subnet() {
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local subnet="${1}"
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# Don't block a wildcard subnet
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if [ "${subnet}" = "0.0.0.0/0" ] || [ "${subnet}" = "0.0.0.0/0.0.0.0" ]; then
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return 0
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fi
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iptables -A IPSECBLOCK -d "${subnet}" -j REJECT --reject-with icmp-net-unreachable
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}
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block_ipsec() {
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# Flush all exists rules
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iptables -F IPSECBLOCK
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local id status name lefthost type ctype unknown1 unknown2 unknown3
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local leftsubnets unknown4 righthost rightsubnets rest
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while IFS="," read -r id status name lefthost type ctype unkown1 unknown2 unknown3 \
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leftsubnets unknown4 righthost rightsubnets rest; 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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# Split multiple subnets
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rightsubnets="${rightsubnets//\|/ }"
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local rightsubnet
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for rightsubnet in ${rightsubnets}; do
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block_subnet "${rightsubnet}"
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done
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done < "${VPN_CONFIG}"
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}
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block_ipsec || exit $?
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