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https://github.com/freebsd/freebsd-src
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4d846d260e
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
#!/usr/bin/env python3
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#
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# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (c) 2019 Kristof Provost <kp@FreeBSD.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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import argparse
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import logging
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logging.getLogger("scapy").setLevel(logging.CRITICAL)
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import scapy.all as sp
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import sys
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from sniffer import Sniffer
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def check_icmp_error(args, packet):
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ip = packet.getlayer(sp.IP)
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if not ip:
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return False
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if ip.dst != args.to[0]:
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return False
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icmp = packet.getlayer(sp.ICMP)
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if not icmp:
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return False
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if icmp.type != 3 or icmp.code != 3:
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return False
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return True
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def main():
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parser = argparse.ArgumentParser("CVE-2019-icmp.py",
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description="CVE-2019-icmp test tool")
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parser.add_argument('--sendif', nargs=1,
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required=True,
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help='The interface through which the packet will be sent')
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parser.add_argument('--recvif', nargs=1,
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required=True,
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help='The interface on which to check for the packet')
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parser.add_argument('--src', nargs=1,
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required=True,
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help='The source IP address')
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parser.add_argument('--to', nargs=1,
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required=True,
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help='The destination IP address')
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args = parser.parse_args()
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# Send the allowed packet to establish state
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udp = sp.Ether() / \
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sp.IP(src=args.src[0], dst=args.to[0]) / \
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sp.UDP(dport=53, sport=1234)
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sp.sendp(udp, iface=args.sendif[0], verbose=False)
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# Start sniffing on recvif
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sniffer = Sniffer(args, check_icmp_error, args.recvif[0])
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# Send the bad error packet
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icmp_reachable = sp.Ether() / \
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sp.IP(src=args.src[0], dst=args.to[0]) / \
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sp.ICMP(type=3, code=3) / \
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sp.IP(src="4.3.2.1", dst="1.2.3.4") / \
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sp.UDP(dport=53, sport=1234)
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sp.sendp(icmp_reachable, iface=args.sendif[0], verbose=False)
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sniffer.join()
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if sniffer.correctPackets:
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sys.exit(1)
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sys.exit(0)
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if __name__ == '__main__':
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main()
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