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#!/usr/bin/env python
# Copyright (c) 2019 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 IP
from scapy.layers.inet6 import IPv6, ICMPv6ND_NS
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_ipsec(pkt_recv, ip_layer, dst_tun, src_ip, dst_ip, sa_in):
"""Check received IPsec packet.
:param pkt_recv: Received packet to verify.
:param ip_layer: Scapy IP layer.
:param dst_tun: IPsec tunnel destination address.
:param src_ip: Source IP/IPv6 address of original IP/IPv6 packet.
:param dst_ip: Destination IP/IPv6 address of original IP/IPv6 packet.
:param sa_in: IPsec SA for packet decryption.
:type pkt_recv: scapy.Ether
:type ip_layer: scapy.layers.inet.IP or scapy.layers.inet6.IPv6
: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_layer):
raise RuntimeError('Not an {ip} packet received: {pkt}'.format(
ip=ip_layer.name, pkt=pkt_recv.__repr__()))
if pkt_recv[ip_layer.name].dst != dst_tun:
raise RuntimeError(
'Received packet has invalid destination address: {rec_ip} '
'should be: {exp_ip}'.format(
rec_ip=pkt_recv[ip_layer.name].dst, exp_ip=dst_tun))
if not pkt_recv.haslayer(ESP):
raise RuntimeError(
'Not an ESP packet received: {pkt}'.format(pkt=pkt_recv.__repr__()))
ip_pkt = pkt_recv[ip_layer]
d_pkt = sa_in.decrypt(ip_pkt)
if d_pkt[ip_layer].dst != dst_ip:
raise RuntimeError(
'Decrypted packet has invalid destination address: {rec_ip} '
'should be: {exp_ip}'.format(
rec_ip=d_pkt[ip_layer].dst, exp_ip=dst_ip))
if d_pkt[ip_layer].src != src_ip:
raise RuntimeError(
'Decrypted packet has invalid source address: {rec_ip} should be: '
'{exp_ip}'.format(rec_ip=d_pkt[ip_layer].src, exp_ip=src_ip))
if ip_layer == IP and d_pkt[ip_layer.name].proto != 61:
raise RuntimeError(
'Decrypted packet has invalid IP protocol: {rec_proto} '
'should be: 61'.format(rec_proto=d_pkt[ip_layer.name].proto))
def check_ip(pkt_recv, ip_layer, src_ip, dst_ip):
"""Check received IP/IPv6 packet.
:param pkt_recv: Received packet to verify.
:param ip_layer: Scapy IP layer.
:param src_ip: Source IP/IPv6 address.
:param dst_ip: Destination IP/IPv6 address.
:type pkt_recv: scapy.Ether
:type ip_layer: scapy.layers.inet.IP or scapy.layers.inet6.IPv6
:type src_ip: str
:type dst_ip: str
:raises RuntimeError: If received packet is invalid.
"""
if not pkt_recv.haslayer(ip_layer):
raise RuntimeError('Not an {ip} packet received: {pkt}'.format(
ip=ip_layer.name, pkt=pkt_recv.__repr__()))
if pkt_recv[ip_layer.name].dst != dst_ip:
raise RuntimeError(
'Received packet has invalid destination address: {rec_ip} '
'should be: {exp_ip}'.format(
rec_ip=pkt_recv[ip_layer.name].dst, exp_ip=dst_ip))
if pkt_recv[ip_layer.name].src != src_ip:
raise RuntimeError(
'Received packet has invalid destination address: {rec_ip} '
'should be: {exp_ip}'.format(
rec_ip=pkt_recv[ip_layer.name].dst, exp_ip=src_ip))
if ip_layer == IP and pkt_recv[ip_layer.name].proto != 61:
raise RuntimeError(
'Received packet has invalid IP protocol: {rec_proto} '
'should be: 61'.format(rec_proto=pkt_recv[ip_layer.name].proto))
# pylint: disable=too-many-locals
# pylint: disable=too-many-statements
def main():
"""Send and receive IPsec packet."""
args = TrafficScriptArg(
['tx_src_mac', 'tx_dst_mac', 'rx_src_mac', 'rx_dst_mac', 'src_ip',
'dst_ip','crypto_alg', 'crypto_key', 'integ_alg', 'integ_key',
'l_spi', 'r_spi'],
['src_tun', 'dst_tun']
)
tx_txq = TxQueue(args.get_arg('tx_if'))
tx_rxq = RxQueue(args.get_arg('tx_if'))
rx_txq = TxQueue(args.get_arg('rx_if'))
rx_rxq = RxQueue(args.get_arg('rx_if'))
tx_src_mac = args.get_arg('tx_src_mac')
tx_dst_mac = args.get_arg('tx_dst_mac')
rx_src_mac = args.get_arg('rx_src_mac')
rx_dst_mac = args.get_arg('rx_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')
if ip_address(unicode(src_ip)).version == 6:
ip_layer = IPv6
else:
ip_layer = IP
tunnel_out = ip_layer(src=src_tun, dst=dst_tun) if src_tun and dst_tun \
else None
tunnel_in = ip_layer(src=dst_tun, dst=src_tun) if src_tun and dst_tun \
else None
if not (src_tun and dst_tun):
src_tun = src_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)
ip_pkt = ip_layer(src=src_ip, dst=dst_ip, proto=61) if ip_layer == IP \
else ip_layer(src=src_ip, dst=dst_ip)
ip_pkt = ip_layer(str(ip_pkt))
e_pkt = sa_out.encrypt(ip_pkt)
tx_pkt_send = (Ether(src=tx_src_mac, dst=tx_dst_mac) /
e_pkt)
sent_packets = list()
sent_packets.append(tx_pkt_send)
tx_txq.send(tx_pkt_send)
while True:
rx_pkt_recv = rx_rxq.recv(2)
if rx_pkt_recv is None:
raise RuntimeError(
'{ip} packet Rx timeout'.format(ip=ip_layer.name))
if rx_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
check_ip(rx_pkt_recv, ip_layer, src_ip, dst_ip)
rx_ip_pkt = ip_layer(src=dst_ip, dst=src_ip, proto=61) if ip_layer == IP \
else ip_layer(src=dst_ip, dst=src_ip)
rx_pkt_send = (Ether(src=rx_dst_mac, dst=rx_src_mac) /
rx_ip_pkt)
rx_txq.send(rx_pkt_send)
while True:
tx_pkt_recv = tx_rxq.recv(2, sent_packets)
if tx_pkt_recv is None:
raise RuntimeError('ESP packet Rx timeout')
if rx_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
check_ipsec(tx_pkt_recv, ip_layer, src_tun, dst_ip, src_ip, sa_in)
sys.exit(0)
if __name__ == "__main__":
main()
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