--- /dev/null
+#!/usr/bin/env python3
+
+# Copyright (c) 2020 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
+
+from ipaddress import ip_address
+from scapy.layers.inet import IP
+from scapy.layers.inet6 import IPv6, ICMPv6ND_NS
+from scapy.layers.ipsec import SecurityAssociation, ESP
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+
+from .PacketVerifier import RxQueue, TxQueue
+from .TrafficScriptArg import TrafficScriptArg
+
+
+def check_ipsec(
+ pkt_recv, ip_layer, src_mac, dst_mac, src_tun, 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 src_mac: Source MAC address.
+ :param dst_mac: Destination MAC address.
+ :param src_tun: IPsec tunnel source address.
+ :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 src_mac: str
+ :type dst_mac: str
+ :type src_tun: str
+ :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 pkt_recv[Ether].src != src_mac:
+ raise RuntimeError(
+ f"Received frame has invalid source MAC address: "
+ f"{pkt_recv[Ether].src} should be: {src_mac}"
+ )
+
+ if pkt_recv[Ether].dst != dst_mac:
+ raise RuntimeError(
+ f"Received frame has invalid destination MAC address: "
+ f"{pkt_recv[Ether].dst} should be: {dst_mac}"
+ )
+
+ if not pkt_recv.haslayer(ip_layer):
+ raise RuntimeError(
+ f"Not an {ip_layer.name} packet received: {pkt_recv!r}"
+ )
+
+ if pkt_recv[ip_layer].src != src_tun:
+ raise RuntimeError(
+ f"Received packet has invalid source address: "
+ f"{pkt_recv[ip_layer].src} should be: {src_tun}"
+ )
+
+ if pkt_recv[ip_layer].dst != dst_tun:
+ raise RuntimeError(
+ f"Received packet has invalid destination address: "
+ f"{pkt_recv[ip_layer].dst} should be: {dst_tun}"
+ )
+
+ if not pkt_recv.haslayer(ESP):
+ raise RuntimeError(f"Not an ESP packet received: {pkt_recv!r}")
+
+ ip_pkt = pkt_recv[ip_layer]
+ d_pkt = sa_in.decrypt(ip_pkt)
+
+ if d_pkt[ip_layer].dst != dst_ip:
+ raise RuntimeError(
+ f"Decrypted packet has invalid destination address: "
+ f"{d_pkt[ip_layer].dst} should be: {dst_ip}"
+ )
+
+ if d_pkt[ip_layer].src != src_ip:
+ raise RuntimeError(
+ f"Decrypted packet has invalid source address: "
+ f"{d_pkt[ip_layer].src} should be: {src_ip}"
+ )
+
+ if ip_layer == IP and d_pkt[ip_layer].proto != 61:
+ raise RuntimeError(
+ f"Decrypted packet has invalid IP protocol: "
+ f"{d_pkt[ip_layer].proto} should be: 61"
+ )
+
+
+def check_ip(pkt_recv, ip_layer, src_mac, dst_mac, src_ip, dst_ip):
+ """Check received IP/IPv6 packet.
+
+ :param pkt_recv: Received packet to verify.
+ :param ip_layer: Scapy IP layer.
+ :param src_mac: Source MAC address.
+ :param dst_mac: Destination MAC address.
+ :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_mac: str
+ :type dst_mac: str
+ :type src_ip: str
+ :type dst_ip: str
+ :raises RuntimeError: If received packet is invalid.
+ """
+ if pkt_recv[Ether].src != src_mac:
+ raise RuntimeError(
+ f"Received frame has invalid source MAC address: "
+ f"{pkt_recv[Ether].src} should be: {src_mac}"
+ )
+
+ if pkt_recv[Ether].dst != dst_mac:
+ raise RuntimeError(
+ f"Received frame has invalid destination MAC address: "
+ f"{pkt_recv[Ether].dst} should be: {dst_mac}"
+ )
+
+ if not pkt_recv.haslayer(ip_layer):
+ raise RuntimeError(
+ f"Not an {ip_layer.name} packet received: {pkt_recv!r}"
+ )
+
+ if pkt_recv[ip_layer].dst != dst_ip:
+ raise RuntimeError(
+ f"Received packet has invalid destination address: "
+ f"{pkt_recv[ip_layer.name].dst} should be: {dst_ip}"
+ )
+
+ if pkt_recv[ip_layer].src != src_ip:
+ raise RuntimeError(
+ f"Received packet has invalid destination address: "
+ f"{pkt_recv[ip_layer.name].dst} should be: {src_ip}"
+ )
+
+ if ip_layer == IP and pkt_recv[ip_layer].proto != 61:
+ raise RuntimeError(
+ f"Received packet has invalid IP protocol: "
+ f"{pkt_recv[ip_layer].proto} should be: 61"
+ )
+
+
+def main():
+ """Send and receive IPsec packet."""
+
+ args = TrafficScriptArg(
+ [
+ u"tx_src_mac", u"tx_dst_mac", u"rx_src_mac", u"rx_dst_mac",
+ u"src_ip", u"dst_ip", u"src_tun", u"dst_tun", u"crypto_alg",
+ u"crypto_key", u"integ_alg", u"integ_key", u"l_spi", u"r_spi"
+ ]
+ )
+
+ tx_txq = TxQueue(args.get_arg(u"tx_if"))
+ tx_rxq = RxQueue(args.get_arg(u"tx_if"))
+ rx_txq = TxQueue(args.get_arg(u"rx_if"))
+ rx_rxq = RxQueue(args.get_arg(u"rx_if"))
+
+ tx_src_mac = args.get_arg(u"tx_src_mac")
+ tx_dst_mac = args.get_arg(u"tx_dst_mac")
+ rx_src_mac = args.get_arg(u"rx_src_mac")
+ rx_dst_mac = args.get_arg(u"rx_dst_mac")
+ src_ip = args.get_arg(u"src_ip")
+ dst_ip = args.get_arg(u"dst_ip")
+ src_tun = args.get_arg(u"src_tun")
+ dst_tun = args.get_arg(u"dst_tun")
+ crypto_alg = args.get_arg(u"crypto_alg")
+ crypto_key = args.get_arg(u"crypto_key")
+ integ_alg = args.get_arg(u"integ_alg")
+ integ_key = args.get_arg(u"integ_key")
+ l_spi = int(args.get_arg(u"l_spi"))
+ r_spi = int(args.get_arg(u"r_spi"))
+
+ ip_layer = IP if ip_address(src_ip).version == 4 else IPv6
+ 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)
+
+ tunnel_in = ip_layer(src=src_tun, dst=dst_tun)
+ tunnel_out = ip_layer(src=dst_tun, dst=src_tun)
+
+ sa_in = SecurityAssociation(
+ ESP, spi=l_spi, crypt_algo=crypto_alg,
+ crypt_key=crypto_key.encode(encoding=u"utf-8"), auth_algo=integ_alg,
+ auth_key=integ_key.encode(encoding=u"utf-8"),
+ tunnel_header=tunnel_in
+ )
+
+ sa_out = SecurityAssociation(
+ ESP, spi=r_spi, crypt_algo=crypto_alg,
+ crypt_key=crypto_key.encode(encoding=u"utf-8"), auth_algo=integ_alg,
+ auth_key=integ_key.encode(encoding=u"utf-8"),
+ tunnel_header=tunnel_out
+ )
+
+ sent_packets = list()
+ tx_pkt_send = (Ether(src=tx_src_mac, dst=tx_dst_mac) / ip_pkt)
+ tx_pkt_send /= Raw()
+ size_limit = 78 if ip_layer == IPv6 else 64
+ if len(tx_pkt_send) < size_limit:
+ tx_pkt_send[Raw].load += (b"\0" * (size_limit - len(tx_pkt_send)))
+ 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(f"{ip_layer.name} 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(
+ rx_pkt_recv, ip_layer, rx_src_mac, rx_dst_mac, src_tun, dst_tun, src_ip,
+ dst_ip, sa_in
+ )
+
+ 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)
+ ip_pkt /= Raw()
+ if len(ip_pkt) < (size_limit - 14):
+ ip_pkt[Raw].load += (b"\0" * (size_limit - 14 - len(ip_pkt)))
+ e_pkt = sa_out.encrypt(ip_pkt)
+ rx_pkt_send = (Ether(src=rx_dst_mac, dst=rx_src_mac) /
+ e_pkt)
+ rx_txq.send(rx_pkt_send)
+
+ while True:
+ tx_pkt_recv = tx_rxq.recv(2, ignore=sent_packets)
+
+ if tx_pkt_recv is None:
+ raise RuntimeError(f"{ip_layer.name} packet Rx timeout")
+
+ if tx_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(tx_pkt_recv, ip_layer, tx_dst_mac, tx_src_mac, dst_ip, src_ip)
+
+ sys.exit(0)
+
+
+if __name__ == u"__main__":
+ main()
Code Review / csit.git / blobdiff