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
|
#!/usr/bin/env python
# Impacket - Collection of Python classes for working with network protocols.
#
# Copyright Fortra, LLC and its affiliated companies
#
# All rights reserved.
#
# This software is provided under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
import unittest
from impacket import IP6, ImpactDecoder, ICMP6
class TestICMP6(unittest.TestCase):
def setUp(self):
self.packet_list = self.generate_icmp6_constructed_packets()
self.message_description_list = [
"Echo Request",
"Echo Reply",
"Parameter problem - Erroneous header field",
"Parameter problem - Unrecognized Next Header",
"Parameter problem - Unrecognized IP6 Option",
"Destination unreachable - No route to destination",
"Destination unreachable - Administratively prohibited",
"Destination unreachable - Beyond scope of source address",
"Destination unreachable - Address unreachable ",
"Destination unreachable - Port unreachable",
"Destination unreachable - Src addr failed due to policy",
"Destination unreachable - Reject route",
"Time exceeded - Hop limit exceeded in transit",
"Time exceeded - Fragment reassembly time exceeded",
"Packet too big"
]
self.reference_data_list = [
[0x80, 0x00, 0xA2, 0xA6, 0x00, 0x01, 0x00, 0x02, 0xFE, 0x56, 0x88],#Echo Request
[0x81, 0x00, 0xA1, 0xA6, 0x00, 0x01, 0x00, 0x02, 0xFE, 0x56, 0x88],#Echo Reply
[0x04, 0x00, 0x1E, 0xA8, 0x00, 0x00, 0x00, 0x02, 0xFE, 0x56, 0x88],#Parameter problem
[0x04, 0x01, 0x1E, 0xA7, 0x00, 0x00, 0x00, 0x02, 0xFE, 0x56, 0x88],
[0x04, 0x02, 0x1E, 0xA6, 0x00, 0x00, 0x00, 0x02, 0xFE, 0x56, 0x88],
[0x01, 0x00, 0x21, 0xAA, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],#Dest. unreachable
[0x01, 0x01, 0x21, 0xA9, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],
[0x01, 0x02, 0x21, 0xA8, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],
[0x01, 0x03, 0x21, 0xA7, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],
[0x01, 0x04, 0x21, 0xA6, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],
[0x01, 0x05, 0x21, 0xA5, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],
[0x01, 0x06, 0x21, 0xA4, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],
[0x03, 0x00, 0x1F, 0xAA, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],#Time exceeded
[0x03, 0x01, 0x1F, 0xA9, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x56, 0x88],
[0x02, 0x00, 0x1B, 0x96, 0x00, 0x00, 0x05, 0x14, 0xFE, 0x56, 0x88]#Packet too big
]
def encapsulate_icmp6_packet_in_ip6_packet(self, icmp6_packet):
#Build IP6 reference packet (which will be used to construct the pseudo-header and checksum)
ip6_packet = IP6.IP6()
ip6_packet.set_traffic_class(0)
ip6_packet.set_flow_label(0)
ip6_packet.set_hop_limit(1)
ip6_packet.set_ip_src("FE80::78F8:89D1:30FF:256B")
ip6_packet.set_ip_dst("FF02::1")
#Encapsulate ICMP6 packet in IP6 packet, calculate the checksum using the pseudo-header
ip6_packet.contains(icmp6_packet)
ip6_packet.set_next_header(ip6_packet.child().get_ip_protocol_number())
ip6_packet.set_payload_length(ip6_packet.child().get_size())
icmp6_packet.calculate_checksum()
return ip6_packet
def compare_icmp6_packet_with_reference_buffer(self, icmp6_packet, reference_buffer, test_fail_message):
#Encapsulate the packet, in order to compute the checksum
ip6_packet = self.encapsulate_icmp6_packet_in_ip6_packet(icmp6_packet)
#Extract the header and payload bytes
icmp6_header_buffer = ip6_packet.child().get_bytes().tolist()
icmp6_payload_buffer = icmp6_packet.child().get_bytes().tolist()
generated_buffer = icmp6_header_buffer + icmp6_payload_buffer
self.assertEqual(generated_buffer, reference_buffer, test_fail_message)
def generate_icmp6_constructed_packets(self):
packet_list = []
arbitrary_data = [0xFE, 0x56, 0x88]
echo_id = 1
echo_sequence_number = 2
icmp6_packet = ICMP6.ICMP6.Echo_Request(echo_id, echo_sequence_number, arbitrary_data)
packet_list.append(icmp6_packet)
icmp6_packet = ICMP6.ICMP6.Echo_Reply(echo_id, echo_sequence_number, arbitrary_data)
packet_list.append(icmp6_packet)
originating_packet_data = arbitrary_data
for code in range(0, 3):
problem_pointer = 2
icmp6_packet = ICMP6.ICMP6.Parameter_Problem(code, problem_pointer, originating_packet_data)
packet_list.append(icmp6_packet)
for code in range(0, 7):
icmp6_packet = ICMP6.ICMP6.Destination_Unreachable(code, originating_packet_data)
packet_list.append(icmp6_packet)
for code in range(0, 2):
icmp6_packet = ICMP6.ICMP6.Time_Exceeded(code, originating_packet_data)
packet_list.append(icmp6_packet)
icmp6_packet = ICMP6.ICMP6.Packet_Too_Big(1300, originating_packet_data)
packet_list.append(icmp6_packet)
return packet_list
def test_message_construction(self):
for packet, reference, msg in zip(self.packet_list, self.reference_data_list, self.message_description_list):
self.compare_icmp6_packet_with_reference_buffer(packet, reference, "ICMP6 creation of " + msg + " - Buffer mismatch")
def test_message_decoding(self):
d = ImpactDecoder.ICMP6Decoder()
msg_types = [
ICMP6.ICMP6.ECHO_REQUEST,
ICMP6.ICMP6.ECHO_REPLY,
ICMP6.ICMP6.PARAMETER_PROBLEM,
ICMP6.ICMP6.PARAMETER_PROBLEM,
ICMP6.ICMP6.PARAMETER_PROBLEM,
ICMP6.ICMP6.DESTINATION_UNREACHABLE,
ICMP6.ICMP6.DESTINATION_UNREACHABLE,
ICMP6.ICMP6.DESTINATION_UNREACHABLE,
ICMP6.ICMP6.DESTINATION_UNREACHABLE,
ICMP6.ICMP6.DESTINATION_UNREACHABLE,
ICMP6.ICMP6.DESTINATION_UNREACHABLE,
ICMP6.ICMP6.DESTINATION_UNREACHABLE,
ICMP6.ICMP6.TIME_EXCEEDED,
ICMP6.ICMP6.TIME_EXCEEDED,
ICMP6.ICMP6.PACKET_TOO_BIG
]
msg_codes = [
0,
0,
ICMP6.ICMP6.ERRONEOUS_HEADER_FIELD_ENCOUNTERED,
ICMP6.ICMP6.UNRECOGNIZED_NEXT_HEADER_TYPE_ENCOUNTERED,
ICMP6.ICMP6.UNRECOGNIZED_IPV6_OPTION_ENCOUNTERED,
ICMP6.ICMP6.NO_ROUTE_TO_DESTINATION,
ICMP6.ICMP6.ADMINISTRATIVELY_PROHIBITED,
ICMP6.ICMP6.BEYOND_SCOPE_OF_SOURCE_ADDRESS,
ICMP6.ICMP6.ADDRESS_UNREACHABLE,
ICMP6.ICMP6.PORT_UNREACHABLE,
ICMP6.ICMP6.SOURCE_ADDRESS_FAILED_INGRESS_EGRESS_POLICY,
ICMP6.ICMP6.REJECT_ROUTE_TO_DESTINATION,
ICMP6.ICMP6.HOP_LIMIT_EXCEEDED_IN_TRANSIT,
ICMP6.ICMP6.FRAGMENT_REASSEMBLY_TIME_EXCEEDED,
0
]
for i in range (0, len(self.reference_data_list)):
p = d.decode(self.reference_data_list[i])
self.assertEqual(p.get_type(), msg_types[i], self.message_description_list[i] + " - Msg type mismatch")
self.assertEqual(p.get_code(), msg_codes[i], self.message_description_list[i] + " - Msg code mismatch")
if i in range(0, 2):
self.assertEqual(p.get_echo_id(), 1, self.message_description_list[i] + " - ID mismatch")
self.assertEqual(p.get_echo_sequence_number(), 2, self.message_description_list[i] + " - Sequence number mismatch")
self.assertEqual(p.get_echo_arbitrary_data().tolist(), [0xFE, 0x56, 0x88], self.message_description_list[i] + " - Arbitrary data mismatch")
if i in range(2, 5):
self.assertEqual(p.get_parm_problem_pointer(), 2, self.message_description_list[i] + " - Pointer mismatch")
if i in range(5, 15):
self.assertEqual(p.get_originating_packet_data().tolist(), [0xFE, 0x56, 0x88], self.message_description_list[i] + " - Originating packet data mismatch")
if i in range(14, 15):
self.assertEqual(p.get_mtu(), 1300, self.message_description_list[i] + " - MTU mismatch")
if __name__ == '__main__':
unittest.main(verbosity=1)
|
