1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
#!/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 template_ipsec import TemplateIpsec
class IPSecNATTestCase(TemplateIpsec):
""" IPSec/NAT
TUNNEL MODE:
public network | private network
--- encrypt --- plain ---
|pg0| <------- |VPP| <------ |pg1|
--- --- ---
--- decrypt --- plain ---
|pg0| -------> |VPP| ------> |pg1|
--- --- ---
"""
tcp_port_in = 6303
tcp_port_out = 6303
udp_port_in = 6304
udp_port_out = 6304
icmp_id_in = 6305
icmp_id_out = 6305
@classmethod
def setUpClass(cls):
super(IPSecNATTestCase, cls).setUpClass()
cls.tun_if = cls.pg0
cls.vapi.ipsec_spd_add_del(cls.tun_spd_id)
cls.vapi.ipsec_interface_add_del_spd(cls.tun_spd_id,
cls.tun_if.sw_if_index)
p = cls.ipv4_params
cls.config_esp_tun(p)
cls.logger.info(cls.vapi.ppcli("show ipsec"))
src = socket.inet_pton(p.addr_type, p.remote_tun_if_host)
cls.vapi.ip_add_del_route(src, p.addr_len,
cls.tun_if.remote_addr_n[p.addr_type],
is_ipv6=p.is_ipv6)
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 verify_capture_plain(self, capture):
for packet in capture:
try:
self.assert_packet_checksums_valid(packet)
self.assert_equal(packet[IP].src, self.tun_if.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")
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")
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:
copy = packet.__class__(str(packet))
del copy[UDP].len
copy = packet.__class__(str(copy))
self.assert_equal(packet[UDP].len, copy[UDP].len,
"UDP header length")
self.assert_packet_checksums_valid(packet)
self.assertIn(ESP, packet[IP])
decrypt_pkt = sa.decrypt(packet[IP])
self.assert_packet_checksums_valid(decrypt_pkt)
self.assert_equal(decrypt_pkt[IP].src, self.pg1.remote_ip4,
"encrypted packet source address")
self.assert_equal(decrypt_pkt[IP].dst, self.tun_if.remote_ip4,
"encrypted packet destination address")
except Exception:
self.logger.error(
ppp("Unexpected or invalid encrypted packet:", packet))
raise
@classmethod
def config_esp_tun(cls, params):
addr_type = params.addr_type
scapy_tun_sa_id = params.scapy_tun_sa_id
scapy_tun_spi = params.scapy_tun_spi
vpp_tun_sa_id = params.vpp_tun_sa_id
vpp_tun_spi = params.vpp_tun_spi
auth_algo_vpp_id = params.auth_algo_vpp_id
auth_key = params.auth_key
crypt_algo_vpp_id = params.crypt_algo_vpp_id
crypt_key = params.crypt_key
addr_any = params.addr_any
addr_bcast = params.addr_bcast
cls.vapi.ipsec_sad_add_del_entry(scapy_tun_sa_id, scapy_tun_spi,
auth_algo_vpp_id, auth_key,
crypt_algo_vpp_id, crypt_key,
cls.vpp_esp_protocol,
cls.pg1.remote_addr_n[addr_type],
cls.tun_if.remote_addr_n[addr_type],
udp_encap=1)
cls.vapi.ipsec_sad_add_del_entry(vpp_tun_sa_id, vpp_tun_spi,
auth_algo_vpp_id, auth_key,
crypt_algo_vpp_id, crypt_key,
cls.vpp_esp_protocol,
cls.tun_if.remote_addr_n[addr_type],
cls.pg1.remote_addr_n[addr_type],
udp_encap=1)
l_startaddr = r_startaddr = socket.inet_pton(addr_type, addr_any)
l_stopaddr = r_stopaddr = socket.inet_pton(addr_type, addr_bcast)
cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, scapy_tun_sa_id,
l_startaddr, l_stopaddr, r_startaddr,
r_stopaddr,
protocol=socket.IPPROTO_ESP)
cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, scapy_tun_sa_id,
l_startaddr, l_stopaddr, r_startaddr,
r_stopaddr, is_outbound=0,
protocol=socket.IPPROTO_ESP)
cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, scapy_tun_sa_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(cls.tun_spd_id, scapy_tun_sa_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.tun_if.remote_addr_n[addr_type]
r_startaddr = r_stopaddr = cls.pg1.remote_addr_n[addr_type]
cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, vpp_tun_sa_id,
l_startaddr, l_stopaddr, r_startaddr,
r_stopaddr, priority=10, policy=3,
is_outbound=0)
cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, scapy_tun_sa_id,
r_startaddr, r_stopaddr, l_startaddr,
l_stopaddr, priority=10, policy=3)
def test_ipsec_nat_tun(self):
""" IPSec/NAT tunnel test case """
p = self.ipv4_params
scapy_tun_sa = SecurityAssociation(ESP, spi=p.scapy_tun_spi,
crypt_algo=p.crypt_algo,
crypt_key=p.crypt_key,
auth_algo=p.auth_algo,
auth_key=p.auth_key,
tunnel_header=IP(
src=self.pg1.remote_ip4,
dst=self.tun_if.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.tun_if.remote_ip4)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.tun_if.get_capture(len(pkts))
self.verify_capture_encrypted(capture, scapy_tun_sa)
vpp_tun_sa = SecurityAssociation(ESP,
spi=p.vpp_tun_spi,
crypt_algo=p.crypt_algo,
crypt_key=p.crypt_key,
auth_algo=p.auth_algo,
auth_key=p.auth_key,
tunnel_header=IP(
src=self.tun_if.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.tun_if.remote_mac, self.tun_if.local_mac,
self.tun_if.remote_ip4, self.pg1.remote_ip4, vpp_tun_sa)
self.logger.info(ppc("Sending packets:", pkts))
self.tun_if.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)
|
