File: openvpn.rules

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sagan-rules 1:20170725-1
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# Sagan openvpn.rules
# Copyright (c) 2009-2017, Quadrant Information Security <www.quadrantsec.com>
# All rights reserved.
#
# Please submit any custom rules or ideas to sagan-submit@quadrantsec.com or the sagan-sigs mailing list
#
#*************************************************************
# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
# following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
# disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
# following disclaimer in the documentation and/or other materials provided with the distribution.
# * Neither the name of the nor the names of its contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#*************************************************************
# OpenVPN rules. Created by Robert Nunley (rnunley@quadrantsec.com)
# 03/11/2013

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENVPN] Authentication failure [0/5]"; content: "Decrypt packet error"; parse_src_ip: 1; default_proto: udp; default_dst_port: $OPENVPN_PORT; classtype: unsuccessful-user; reference: url,wiki.quadrantsec.com/bin/view/Main/5001651; program: openvpn; threshold:type limit, track by_src, count 5, seconds 300; sid: 5001651; rev:3;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENVPN] Authentication success"; content: "Initialization Sequence Completed"; parse_src_ip: 1; default_proto: udp; default_dst_port: $OPENVPN_PORT; classtype: successful-user; reference: url,wiki.quadrantsec.com/bin/view/Main/5001652; program: openvpn; sid: 5001652; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENVPN] Unencrypted VPN connection initiated"; content: "tunnelled as cleartext"; parse_src_ip: 1; default_proto: udp; default_dst_port: $OPENVPN_PORT; classtype: network-event; reference: url,wiki.quadrantsec.com/bin/view/Main/5001653; program: openvpn; sid: 5001653; rev:3;)