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#!/usr/bin/env python
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Traffic script for IPsec verification."""
import sys
import logging
# pylint: disable=no-name-in-module
# pylint: disable=import-error
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy.all import Ether
from scapy.layers.inet import ICMP, IP
from scapy.layers.inet6 import IPv6, ICMPv6ND_NS
from scapy.layers.inet6 import ICMPv6EchoRequest, ICMPv6EchoReply
from scapy.layers.ipsec import SecurityAssociation, ESP
from ipaddress import ip_address
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
def check_ipv4(pkt_recv, dst_tun, src_ip, dst_ip, sa_in):
"""Check received IPv4 IPsec packet.
:param pkt_recv: Received packet to verify.
:param dst_tun: IPsec tunnel destination address.
:param src_ip: Source address of original IPv4 packet.
:param dst_ip: Destination address of original IPv4 packet.
:param sa_in: IPsec SA for packet decryption.
:type pkt_recv: scapy.Ether
:type dst_tun: str
:type src_ip: str
:type dst_ip: str
:type sa_in: scapy.layers.ipsec.SecurityAssociation
:raises RuntimeError: If received packet is invalid.
"""
if not pkt_recv.haslayer(IP):
raise RuntimeError(
'Not an IPv4 packet received: {0}'.format(pkt_recv.__repr__()))
if pkt_recv['IP'].dst != dst_tun:
raise RuntimeError(
'Received packet has invalid destination address: {0} '
'should be: {1}'.format(pkt_recv['IP'].dst, dst_tun))
if not pkt_recv.haslayer(ESP):
raise RuntimeError(
'Not an ESP packet received: {0}'.format(pkt_recv.__repr__()))
ip_pkt = pkt_recv[IP]
d_pkt = sa_in.decrypt(ip_pkt)
if d_pkt[IP].dst != dst_ip:
raise RuntimeError(
'Decrypted packet has invalid destination address: {0} '
'should be: {1}'.format(d_pkt['IP'].dst, dst_ip))
if d_pkt[IP].src != src_ip:
raise RuntimeError(
'Decrypted packet has invalid source address: {0} should be: {1}'
.format(d_pkt['IP'].src, src_ip))
if not d_pkt.haslayer(ICMP):
raise RuntimeError(
'Decrypted packet does not have ICMP layer: {0}'.format(
d_pkt.__repr__()))
def check_ipv6(pkt_recv, dst_tun, src_ip, dst_ip, sa_in):
"""Check received IPv6 IPsec packet.
:param pkt_recv: Received packet to verify.
:param dst_tun: IPsec tunnel destination address.
:param src_ip: Source address of original IPv6 packet.
:param dst_ip: Destination address of original IPv6 packet.
:param sa_in: IPsec SA for packet decryption.
:type pkt_recv: scapy.Ether
:type dst_tun: str
:type src_ip: str
:type dst_ip: str
:type sa_in: scapy.layers.ipsec.SecurityAssociation
:raises RuntimeError: If received packet is invalid.
"""
if not pkt_recv.haslayer(IPv6):
raise RuntimeError(
'Not an IPv6 packet received: {0}'.format(pkt_recv.__repr__()))
if pkt_recv[IPv6].dst != dst_tun:
raise RuntimeError(
'Received packet has invalid destination address: {0} '
'should be: {1}'.format(pkt_recv['IPv6'].dst, dst_tun))
if not pkt_recv.haslayer(ESP):
raise RuntimeError(
'Not an ESP packet received: {0}'.format(pkt_recv.__repr__()))
ip_pkt = pkt_recv[IPv6]
d_pkt = sa_in.decrypt(ip_pkt)
if d_pkt[IPv6].dst != dst_ip:
raise RuntimeError(
'Decrypted packet has invalid destination address {0}: '
'should be: {1}'.format(d_pkt['IPv6'].dst, dst_ip))
if d_pkt[IPv6].src != src_ip:
raise RuntimeError(
'Decrypted packet has invalid source address: {0} should be: {1}'
.format(d_pkt['IPv6'].src, src_ip))
if not d_pkt.haslayer(ICMPv6EchoReply):
raise RuntimeError(
'Decrypted packet does not have ICMP layer: {0}'.format(
d_pkt.__repr__()))
# pylint: disable=too-many-locals
# pylint: disable=too-many-statements
def main():
"""Send and receive IPsec packet."""
args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip',
'crypto_alg', 'crypto_key', 'integ_alg',
'integ_key', 'l_spi', 'r_spi'],
['src_tun', 'dst_tun'])
rxq = RxQueue(args.get_arg('rx_if'))
txq = TxQueue(args.get_arg('tx_if'))
src_mac = args.get_arg('src_mac')
dst_mac = args.get_arg('dst_mac')
src_ip = args.get_arg('src_ip')
dst_ip = args.get_arg('dst_ip')
crypto_alg = args.get_arg('crypto_alg')
crypto_key = args.get_arg('crypto_key')
integ_alg = args.get_arg('integ_alg')
integ_key = args.get_arg('integ_key')
l_spi = int(args.get_arg('l_spi'))
r_spi = int(args.get_arg('r_spi'))
src_tun = args.get_arg('src_tun')
dst_tun = args.get_arg('dst_tun')
is_ipv4 = True
if 6 == ip_address(unicode(src_ip)).version:
is_ipv4 = False
tunnel_out = None
tunnel_in = None
if src_tun and dst_tun:
if is_ipv4:
tunnel_out = IP(src=src_tun, dst=dst_tun)
tunnel_in = IP(src=dst_tun, dst=src_tun)
else:
tunnel_out = IPv6(src=src_tun, dst=dst_tun)
tunnel_in = IPv6(src=dst_tun, dst=src_tun)
else:
src_tun = src_ip
dst_tun = dst_ip
sa_in = SecurityAssociation(ESP, spi=r_spi, crypt_algo=crypto_alg,
crypt_key=crypto_key, auth_algo=integ_alg,
auth_key=integ_key, tunnel_header=tunnel_in)
sa_out = SecurityAssociation(ESP, spi=l_spi, crypt_algo=crypto_alg,
crypt_key=crypto_key, auth_algo=integ_alg,
auth_key=integ_key, tunnel_header=tunnel_out)
sent_packets = []
if is_ipv4:
ip_pkt = (IP(src=src_ip, dst=dst_ip) /
ICMP())
ip_pkt = IP(str(ip_pkt))
else:
ip_pkt = (IPv6(src=src_ip, dst=dst_ip) /
ICMPv6EchoRequest())
ip_pkt = IPv6(str(ip_pkt))
e_pkt = sa_out.encrypt(ip_pkt)
pkt_send = (Ether(src=src_mac, dst=dst_mac) /
e_pkt)
sent_packets.append(pkt_send)
txq.send(pkt_send)
while True:
pkt_recv = rxq.recv(2, sent_packets)
if pkt_recv is None:
raise RuntimeError('ESP packet Rx timeout')
if pkt_recv.haslayer(ICMPv6ND_NS):
# read another packet in the queue if the current one is ICMPv6ND_NS
continue
else:
# otherwise process the current packet
break
if is_ipv4:
check_ipv4(pkt_recv, src_tun, dst_ip, src_ip, sa_in)
else:
check_ipv6(pkt_recv, src_tun, dst_ip, src_ip, sa_in)
sys.exit(0)
if __name__ == "__main__":
main()
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