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
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
#!/usr/bin/python3
import sys
import os
import socket
import base64
import itertools
import collections
from ssh import *
import agenttestdata
assert sys.version_info[:2] >= (3,0), "This is Python 3 code"
test_session_id = b'Test16ByteSessId'
assert len(test_session_id) == 16
test_message_to_sign = b'test message to sign'
TestSig2 = collections.namedtuple("TestSig2", "flags sig")
class Key2(collections.namedtuple("Key2", "comment public sigs openssh")):
def public_only(self):
return Key2(self.comment, self.public, None, None)
def Add(self):
alg = ssh_decode_string(self.public)
msg = (ssh_byte(SSH2_AGENTC_ADD_IDENTITY) +
ssh_string(alg) +
self.openssh +
ssh_string(self.comment))
return agent_query(msg)
verb = "sign"
def Use(self, flags):
msg = (ssh_byte(SSH2_AGENTC_SIGN_REQUEST) +
ssh_string(self.public) +
ssh_string(test_message_to_sign))
if flags is not None:
msg += ssh_uint32(flags)
rsp = agent_query(msg)
t, rsp = ssh_decode_byte(rsp, True)
assert t == SSH2_AGENT_SIGN_RESPONSE
sig, rsp = ssh_decode_string(rsp, True)
assert len(rsp) == 0
return sig
def Del(self):
msg = (ssh_byte(SSH2_AGENTC_REMOVE_IDENTITY) +
ssh_string(self.public))
return agent_query(msg)
@staticmethod
def DelAll():
msg = (ssh_byte(SSH2_AGENTC_REMOVE_ALL_IDENTITIES))
return agent_query(msg)
@staticmethod
def List():
msg = (ssh_byte(SSH2_AGENTC_REQUEST_IDENTITIES))
rsp = agent_query(msg)
t, rsp = ssh_decode_byte(rsp, True)
assert t == SSH2_AGENT_IDENTITIES_ANSWER
nk, rsp = ssh_decode_uint32(rsp, True)
keylist = []
for _ in range(nk):
p, rsp = ssh_decode_string(rsp, True)
c, rsp = ssh_decode_string(rsp, True)
keylist.append(Key2(c, p, None, None))
assert len(rsp) == 0
return keylist
@classmethod
def make_examples(cls):
cls.examples = agenttestdata.key2examples(cls, TestSig2)
def iter_testsigs(self):
for testsig in self.sigs:
if testsig.flags == 0:
yield testsig._replace(flags=None)
yield testsig
def iter_tests(self):
for testsig in self.iter_testsigs():
yield ([testsig.flags],
" (flags={})".format(testsig.flags),
testsig.sig)
class Key1(collections.namedtuple(
"Key1", "comment public challenge response private")):
def public_only(self):
return Key1(self.comment, self.public, None, None, None)
def Add(self):
msg = (ssh_byte(SSH1_AGENTC_ADD_RSA_IDENTITY) +
self.private +
ssh_string(self.comment))
return agent_query(msg)
verb = "decrypt"
def Use(self, challenge):
msg = (ssh_byte(SSH1_AGENTC_RSA_CHALLENGE) +
self.public +
ssh1_mpint(challenge) +
test_session_id +
ssh_uint32(1))
rsp = agent_query(msg)
t, rsp = ssh_decode_byte(rsp, True)
assert t == SSH1_AGENT_RSA_RESPONSE
assert len(rsp) == 16
return rsp
def Del(self):
msg = (ssh_byte(SSH1_AGENTC_REMOVE_RSA_IDENTITY) +
self.public)
return agent_query(msg)
@staticmethod
def DelAll():
msg = (ssh_byte(SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES))
return agent_query(msg)
@staticmethod
def List():
msg = (ssh_byte(SSH1_AGENTC_REQUEST_RSA_IDENTITIES))
rsp = agent_query(msg)
t, rsp = ssh_decode_byte(rsp, True)
assert t == SSH1_AGENT_RSA_IDENTITIES_ANSWER
nk, rsp = ssh_decode_uint32(rsp, True)
keylist = []
for _ in range(nk):
b, rsp = ssh_decode_uint32(rsp, True)
e, rsp = ssh1_get_mpint(rsp, True)
m, rsp = ssh1_get_mpint(rsp, True)
c, rsp = ssh_decode_string(rsp, True)
keylist.append(Key1(c, ssh_uint32(b)+e+m, None, None, None))
assert len(rsp) == 0
return keylist
@classmethod
def make_examples(cls):
cls.examples = agenttestdata.key1examples(cls)
def iter_tests(self):
yield [self.challenge], "", self.response
def agent_query(msg):
msg = ssh_string(msg)
s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
s.connect(os.environ["SSH_AUTH_SOCK"])
s.send(msg)
length = ssh_decode_uint32(s.recv(4))
assert length < AGENT_MAX_MSGLEN
return s.recv(length)
def enumerate_bits(iterable):
return ((1<<j, item) for j,item in enumerate(iterable))
def gray_code(nbits):
old = 0
for i in itertools.chain(range(1, 1 << nbits), [0]):
new = i ^ (i>>1)
diff = new ^ old
assert diff != 0 and (diff & (diff-1)) == 0
yield old, new, diff
old = new
assert old == 0
class TestRunner:
def __init__(self):
self.ok = True
@staticmethod
def fmt_response(response):
return "'{}'".format(
base64.encodebytes(response).decode("ASCII").replace("\n",""))
@staticmethod
def fmt_keylist(keys):
return "{{{}}}".format(
",".join(key.comment.decode("ASCII") for key in sorted(keys)))
def expect_success(self, text, response):
if response == ssh_byte(SSH_AGENT_SUCCESS):
print(text, "=> success")
elif response == ssh_byte(SSH_AGENT_FAILURE):
print("FAIL!", text, "=> failure")
self.ok = False
else:
print("FAIL!", text, "=>", self.fmt_response(response))
self.ok = False
def check_keylist(self, K, expected_keys):
keys = K.List()
print("list keys =>", self.fmt_keylist(keys))
if set(keys) != set(expected_keys):
print("FAIL! Should have been", self.fmt_keylist(expected_keys))
self.ok = False
def gray_code_test(self, K):
bks = list(enumerate_bits(K.examples))
self.check_keylist(K, {})
for old, new, diff in gray_code(len(K.examples)):
bit, key = next((bit, key) for bit, key in bks if diff & bit)
if new & bit:
self.expect_success("insert " + key.comment.decode("ASCII"),
key.Add())
else:
self.expect_success("delete " + key.comment.decode("ASCII"),
key.Del())
self.check_keylist(K, [key.public_only() for bit, key in bks
if new & bit])
def sign_test(self, K):
for key in K.examples:
for params, message, expected_answer in key.iter_tests():
key.Add()
actual_answer = key.Use(*params)
key.Del()
record = "{} with {}{}".format(
K.verb, key.comment.decode("ASCII"), message)
if actual_answer == expected_answer:
print(record, "=> success")
else:
print("FAIL!", record, "=> {} but expected {}".format(
self.fmt_response(actual_answer),
self.fmt_response(expected_answer)))
self.ok = False
def run(self):
self.expect_success("init: delete all ssh2 keys", Key2.DelAll())
for K in [Key2, Key1]:
self.gray_code_test(K)
self.sign_test(K)
# TODO: negative tests of all kinds.
def main():
Key2.make_examples()
Key1.make_examples()
tr = TestRunner()
tr.run()
if tr.ok:
print("Test run passed")
else:
sys.exit("Test run failed!")
if __name__ == "__main__":
main()
|
