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-rw-r--r--test/test_ipsec_nat.py260
1 files changed, 260 insertions, 0 deletions
diff --git a/test/test_ipsec_nat.py b/test/test_ipsec_nat.py
new file mode 100644
index 00000000000..9c22fbb559a
--- /dev/null
+++ b/test/test_ipsec_nat.py
@@ -0,0 +1,260 @@
+#!/usr/bin/env python
+
+import socket
+
+from scapy.layers.l2 import Ether
+from scapy.layers.inet import ICMP, IP, TCP, UDP
+from scapy.layers.ipsec import SecurityAssociation, ESP
+from util import ppp, ppc
+from framework import VppTestCase
+
+
+class IPSecNATTestCase(VppTestCase):
+ """ IPSec/NAT
+
+ TRANSPORT MODE:
+
+ --- encrypt ---
+ |pg2| <-------> |VPP|
+ --- decrypt ---
+
+ TUNNEL MODE:
+
+
+ public network | private network
+ --- encrypt --- plain ---
+ |pg0| <------- |VPP| <------ |pg1|
+ --- --- ---
+
+ --- decrypt --- plain ---
+ |pg0| -------> |VPP| ------> |pg1|
+ --- --- ---
+ """
+
+ remote_pg0_client_addr = '1.1.1.1'
+
+ @classmethod
+ def setUpClass(cls):
+ super(IPSecNATTestCase, cls).setUpClass()
+ cls.create_pg_interfaces(range(2))
+ for i in cls.pg_interfaces:
+ i.configure_ipv4_neighbors()
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+
+ cls.tcp_port_in = 6303
+ cls.tcp_port_out = 6303
+ cls.udp_port_in = 6304
+ cls.udp_port_out = 6304
+ cls.icmp_id_in = 6305
+ cls.icmp_id_out = 6305
+ cls.config_esp_tun()
+ cls.logger.info(cls.vapi.ppcli("show ipsec"))
+
+ def create_stream_plain(self, src_mac, dst_mac, src_ip, dst_ip):
+ return [
+ # TCP
+ Ether(src=src_mac, dst=dst_mac) /
+ IP(src=src_ip, dst=dst_ip) /
+ TCP(sport=self.tcp_port_in, dport=20),
+ # UDP
+ Ether(src=src_mac, dst=dst_mac) /
+ IP(src=src_ip, dst=dst_ip) /
+ UDP(sport=self.udp_port_in, dport=20),
+ # ICMP
+ Ether(src=src_mac, dst=dst_mac) /
+ IP(src=src_ip, dst=dst_ip) /
+ ICMP(id=self.icmp_id_in, type='echo-request')
+ ]
+
+ def create_stream_encrypted(self, src_mac, dst_mac, src_ip, dst_ip, sa):
+ return [
+ # TCP
+ Ether(src=src_mac, dst=dst_mac) /
+ sa.encrypt(IP(src=src_ip, dst=dst_ip) /
+ TCP(dport=self.tcp_port_out, sport=20)),
+ # UDP
+ Ether(src=src_mac, dst=dst_mac) /
+ sa.encrypt(IP(src=src_ip, dst=dst_ip) /
+ UDP(dport=self.udp_port_out, sport=20)),
+ # ICMP
+ Ether(src=src_mac, dst=dst_mac) /
+ sa.encrypt(IP(src=src_ip, dst=dst_ip) /
+ ICMP(id=self.icmp_id_out, type='echo-request'))
+ ]
+
+ def check_checksum(self, pkt, layer):
+ """ Check checksum of the packet on given layer """
+ new = pkt.__class__(str(pkt))
+ del new[layer].chksum
+ new = new.__class__(str(new))
+ self.assertEqual(new[layer].chksum, pkt[layer].chksum)
+
+ def check_ip_checksum(self, pkt):
+ return self.check_checksum(pkt, 'IP')
+
+ def check_tcp_checksum(self, pkt):
+ return self.check_checksum(pkt, 'TCP')
+
+ def check_udp_checksum(self, pkt):
+ return self.check_checksum(pkt, 'UDP')
+
+ def check_icmp_checksum(self, pkt):
+ return self.check_checksum(pkt, 'ICMP')
+
+ def verify_capture_plain(self, capture):
+ for packet in capture:
+ try:
+ self.check_ip_checksum(packet)
+ self.assert_equal(packet[IP].src, self.pg0.remote_ip4,
+ "decrypted packet source address")
+ self.assert_equal(packet[IP].dst, self.pg1.remote_ip4,
+ "decrypted packet destination address")
+ if packet.haslayer(TCP):
+ self.assertFalse(
+ packet.haslayer(UDP),
+ "unexpected UDP header in decrypted packet")
+ self.assert_equal(packet[TCP].dport, self.tcp_port_in,
+ "decrypted packet TCP destination port")
+ self.check_tcp_checksum(packet)
+ elif packet.haslayer(UDP):
+ if packet[UDP].payload:
+ self.assertFalse(
+ packet[UDP][1].haslayer(UDP),
+ "unexpected UDP header in decrypted packet")
+ self.assert_equal(packet[UDP].dport, self.udp_port_in,
+ "decrypted packet UDP destination port")
+ else:
+ self.assertFalse(
+ packet.haslayer(UDP),
+ "unexpected UDP header in decrypted packet")
+ self.assert_equal(packet[ICMP].id, self.icmp_id_in,
+ "decrypted packet ICMP ID")
+ self.check_icmp_checksum(packet)
+ except Exception:
+ self.logger.error(
+ ppp("Unexpected or invalid plain packet:", packet))
+ raise
+
+ def verify_capture_encrypted(self, capture, sa):
+ for packet in capture:
+ try:
+ self.assertIn(ESP, packet[IP])
+ decrypt_pkt = sa.decrypt(packet[IP])
+ self.assert_equal(decrypt_pkt[IP].src, self.pg1.remote_ip4,
+ "encrypted packet source address")
+ self.assert_equal(decrypt_pkt[IP].dst, self.pg0.remote_ip4,
+ "encrypted packet destination address")
+ # if decrypt_pkt.haslayer(TCP):
+ # self.tcp_port_out = decrypt_pkt[TCP].sport
+ # elif decrypt_pkt.haslayer(UDP):
+ # self.udp_port_out = decrypt_pkt[UDP].sport
+ # else:
+ # self.icmp_id_out = decrypt_pkt[ICMP].id
+ except Exception:
+ self.logger.error(
+ ppp("Unexpected or invalid encrypted packet:", packet))
+ raise
+
+ @classmethod
+ def config_esp_tun(cls):
+ spd_id = 1
+ remote_sa_id = 10
+ local_sa_id = 20
+ remote_tun_spi = 1001
+ local_tun_spi = 1000
+ client = socket.inet_pton(socket.AF_INET, cls.remote_pg0_client_addr)
+ cls.vapi.ip_add_del_route(client, 32, cls.pg0.remote_ip4n)
+ cls.vapi.ipsec_sad_add_del_entry(remote_sa_id, remote_tun_spi,
+ cls.pg1.remote_ip4n,
+ cls.pg0.remote_ip4n,
+ integrity_key_length=20,
+ crypto_key_length=16,
+ protocol=1, udp_encap=1)
+ cls.vapi.ipsec_sad_add_del_entry(local_sa_id, local_tun_spi,
+ cls.pg0.remote_ip4n,
+ cls.pg1.remote_ip4n,
+ integrity_key_length=20,
+ crypto_key_length=16,
+ protocol=1, udp_encap=1)
+ cls.vapi.ipsec_spd_add_del(spd_id)
+ cls.vapi.ipsec_interface_add_del_spd(spd_id, cls.pg0.sw_if_index)
+ l_startaddr = r_startaddr = socket.inet_pton(socket.AF_INET,
+ "0.0.0.0")
+ l_stopaddr = r_stopaddr = socket.inet_pton(socket.AF_INET,
+ "255.255.255.255")
+ cls.vapi.ipsec_spd_add_del_entry(spd_id, l_startaddr, l_stopaddr,
+ r_startaddr, r_stopaddr,
+ protocol=socket.IPPROTO_ESP)
+ cls.vapi.ipsec_spd_add_del_entry(spd_id, l_startaddr, l_stopaddr,
+ r_startaddr, r_stopaddr,
+ protocol=socket.IPPROTO_ESP,
+ is_outbound=0)
+ cls.vapi.ipsec_spd_add_del_entry(spd_id, l_startaddr, l_stopaddr,
+ r_startaddr, r_stopaddr,
+ remote_port_start=4500,
+ remote_port_stop=4500,
+ protocol=socket.IPPROTO_UDP)
+ cls.vapi.ipsec_spd_add_del_entry(spd_id, l_startaddr, l_stopaddr,
+ r_startaddr, r_stopaddr,
+ remote_port_start=4500,
+ remote_port_stop=4500,
+ protocol=socket.IPPROTO_UDP,
+ is_outbound=0)
+ l_startaddr = l_stopaddr = cls.pg0.remote_ip4n
+ r_startaddr = r_stopaddr = cls.pg1.remote_ip4n
+ cls.vapi.ipsec_spd_add_del_entry(spd_id, l_startaddr, l_stopaddr,
+ r_startaddr, r_stopaddr,
+ priority=10, policy=3,
+ is_outbound=0, sa_id=local_sa_id)
+ cls.vapi.ipsec_spd_add_del_entry(spd_id, r_startaddr, r_stopaddr,
+ l_startaddr, l_stopaddr,
+ priority=10, policy=3,
+ sa_id=remote_sa_id)
+
+ def test_ipsec_nat_tun(self):
+ """ IPSec/NAT tunnel test case """
+ local_tun_sa = SecurityAssociation(ESP, spi=0x000003e9,
+ crypt_algo='AES-CBC',
+ crypt_key='JPjyOWBeVEQiMe7h',
+ auth_algo='HMAC-SHA1-96',
+ auth_key='C91KUR9GYMm5GfkEvNjX',
+ tunnel_header=IP(
+ src=self.pg1.remote_ip4,
+ dst=self.pg0.remote_ip4),
+ nat_t_header=UDP(
+ sport=4500,
+ dport=4500))
+ # in2out - from private network to public
+ pkts = self.create_stream_plain(
+ self.pg1.remote_mac, self.pg1.local_mac,
+ self.pg1.remote_ip4, self.pg0.remote_ip4)
+ self.pg1.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg0.get_capture(len(pkts))
+ self.verify_capture_encrypted(capture, local_tun_sa)
+
+ remote_tun_sa = SecurityAssociation(ESP, spi=0x000003e8,
+ crypt_algo='AES-CBC',
+ crypt_key='JPjyOWBeVEQiMe7h',
+ auth_algo='HMAC-SHA1-96',
+ auth_key='C91KUR9GYMm5GfkEvNjX',
+ tunnel_header=IP(
+ src=self.pg0.remote_ip4,
+ dst=self.pg1.remote_ip4),
+ nat_t_header=UDP(
+ sport=4500,
+ dport=4500))
+
+ # out2in - from public network to private
+ pkts = self.create_stream_encrypted(
+ self.pg0.remote_mac, self.pg0.local_mac,
+ self.pg0.remote_ip4, self.pg1.remote_ip4, remote_tun_sa)
+ self.logger.info(ppc("Sending packets:", pkts))
+ self.pg0.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg1.get_capture(len(pkts))
+ self.verify_capture_plain(capture)