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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
|
#!/usr/bin/env python
"""Unit tests for M2Crypto.SMIME.
Copyright (C) 2006 Open Source Applications Foundation. All Rights Reserved.
"""
import os.path
from M2Crypto import BIO, EVP, Rand, SMIME, X509
from tests import unittest
# Various callbacks to set by X509_Store.set_verify_cb() for
# testing with SMIME.verify() afterwards.
# NOTE: if the Python callback function contains compile-time or run-time
# errors, then SMIME.verify() can fail with a mysterious error which can be
# hard to trace back.
# Python exceptions in callbacks do *not* propagate to verify() call.
def verify_cb_dummy_function(ok, ctx):
return ok
def verify_cb_rejects_cert_from_heikki_toivonen(ok, ctx):
cert = ctx.get_current_cert()
return "Heikki Toivonen" not in cert.get_issuer().as_text()
class SMIMETestCase(unittest.TestCase):
cleartext = b"some text to manipulate"
def setUp(self):
# XXX Ugly, but not sure what would be better
self.signed = self.do_test_sign()
self.encrypted = self.do_test_encrypt()
def test_load_bad(self):
s = SMIME.SMIME()
with self.assertRaises(EVP.EVPError):
s.load_key("tests/signer.pem", "tests/signer.pem")
with self.assertRaises(BIO.BIOError):
SMIME.load_pkcs7("nosuchfile-dfg456")
with self.assertRaises(SMIME.PKCS7_Error):
SMIME.load_pkcs7("tests/signer.pem")
with self.assertRaises(SMIME.PKCS7_Error):
SMIME.load_pkcs7_bio(BIO.MemoryBuffer(b"no pkcs7"))
with self.assertRaises(BIO.BIOError):
SMIME.load_pkcs7_der("nosuchfile-dfg456")
with self.assertRaises(SMIME.PKCS7_Error):
SMIME.load_pkcs7_der("tests/signer.pem")
with self.assertRaises(SMIME.PKCS7_Error):
SMIME.load_pkcs7_bio_der(BIO.MemoryBuffer(b"no pkcs7"))
with self.assertRaises(SMIME.SMIME_Error):
SMIME.smime_load_pkcs7("tests/signer.pem")
with self.assertRaises(SMIME.SMIME_Error):
SMIME.smime_load_pkcs7_bio(BIO.MemoryBuffer(b"no pkcs7"))
def test_crlf(self):
self.assertEqual(
SMIME.text_crlf(b"foobar"),
b"Content-Type: text/plain\r\n\r\nfoobar",
)
self.assertEqual(
SMIME.text_crlf_bio(BIO.MemoryBuffer(b"foobar")).read(),
b"Content-Type: text/plain\r\n\r\nfoobar",
)
def do_test_sign(self):
buf = BIO.MemoryBuffer(self.cleartext)
s = SMIME.SMIME()
s.load_key("tests/signer_key.pem", "tests/signer.pem")
p7 = s.sign(buf, SMIME.PKCS7_DETACHED)
self.assertEqual(len(buf), 0)
self.assertEqual(p7.type(), SMIME.PKCS7_SIGNED, p7.type())
self.assertIsInstance(p7, SMIME.PKCS7, p7)
out = BIO.MemoryBuffer()
p7.write(out)
buf = out.read()
self.assertTrue(
buf.startswith(b"-----BEGIN PKCS7-----"),
b"-----BEGIN PKCS7-----",
)
buf = buf.strip()
self.assertTrue(
buf.endswith(b"-----END PKCS7-----"),
buf[-len(b"-----END PKCS7-----") :],
)
self.assertGreater(
len(buf),
len(b"-----END PKCS7-----") + len(b"-----BEGIN PKCS7-----"),
)
s.write(out, p7, BIO.MemoryBuffer(self.cleartext))
return out
def test_sign(self):
self.do_test_sign()
def test_sign_unknown_digest(self):
buf = BIO.MemoryBuffer(self.cleartext)
s = SMIME.SMIME()
s.load_key("tests/signer_key.pem", "tests/signer.pem")
self.assertRaises(
SMIME.SMIME_Error,
s.sign,
buf,
SMIME.PKCS7_DETACHED,
"invalid digest name",
)
def test_sign_nondefault_digest(self):
buf = BIO.MemoryBuffer(self.cleartext)
s = SMIME.SMIME()
s.load_key("tests/signer_key.pem", "tests/signer.pem")
p7 = s.sign(buf, flags=SMIME.PKCS7_DETACHED, algo="sha512")
self.assertEqual(p7.type(), SMIME.PKCS7_SIGNED)
def test_sign_with_stack(self):
buf = BIO.MemoryBuffer(self.cleartext)
s = SMIME.SMIME()
s.load_key("tests/signer_key.pem", "tests/signer.pem")
cert = X509.load_cert("tests/server.pem")
stack = X509.X509_Stack()
stack.push(cert)
s.set_x509_stack(stack)
p7 = s.sign(buf, flags=SMIME.PKCS7_DETACHED, algo="sha512")
self.assertEqual(p7.type(), SMIME.PKCS7_SIGNED)
def test_store_load_info(self):
st = X509.X509_Store()
with self.assertRaises(X509.X509Error):
st.load_info("tests/ca.pem-typoname")
self.assertEqual(st.load_info("tests/ca.pem"), 1)
def test_verify(self):
s = SMIME.SMIME()
x509 = X509.load_cert("tests/signer.pem")
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
st = X509.X509_Store()
st.load_info("tests/ca.pem")
s.set_x509_store(st)
p7, data = SMIME.smime_load_pkcs7_bio(self.signed)
self.assertIsInstance(p7, SMIME.PKCS7, p7)
v = s.verify(p7, data)
self.assertEqual(v, self.cleartext)
t = p7.get0_signers(sk)
self.assertEqual(len(t), 1)
self.assertEqual(t[0].as_pem(), x509.as_pem(), t[0].as_text())
def test_verify_with_static_callback(self):
s = SMIME.SMIME()
x509 = X509.load_cert("tests/signer.pem")
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
st = X509.X509_Store()
st.load_info("tests/ca.pem")
st.set_verify_cb(verify_cb_rejects_cert_from_heikki_toivonen)
s.set_x509_store(st)
p7, data = SMIME.smime_load_pkcs7_bio(self.signed)
self.assertIsInstance(p7, SMIME.PKCS7, p7)
# Should reject certificate issued by Heikki Toivonen:
with self.assertRaises(SMIME.PKCS7_Error):
s.verify(p7, data)
data.seek(0)
st.set_verify_cb(verify_cb_dummy_function)
v = s.verify(p7, data)
self.assertEqual(v, self.cleartext)
data.seek(0)
st.set_verify_cb()
v = s.verify(p7, data)
self.assertEqual(v, self.cleartext)
def verify_cb_dummy_method(self, ok, store):
return verify_cb_dummy_function(ok, store)
def test_verify_with_method_callback(self):
s = SMIME.SMIME()
x509 = X509.load_cert("tests/signer.pem")
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
st = X509.X509_Store()
st.load_info("tests/ca.pem")
st.set_verify_cb(self.verify_cb_dummy_method)
s.set_x509_store(st)
p7, data = SMIME.smime_load_pkcs7_bio(self.signed)
self.assertIsInstance(p7, SMIME.PKCS7, p7)
v = s.verify(p7, data)
self.assertEqual(v, self.cleartext)
def test_verifyBad(self):
s = SMIME.SMIME()
x509 = X509.load_cert("tests/recipient.pem")
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
st = X509.X509_Store()
st.load_info("tests/recipient.pem")
s.set_x509_store(st)
p7, data = SMIME.smime_load_pkcs7_bio(self.signed)
self.assertIsInstance(p7, SMIME.PKCS7, p7)
with self.assertRaises(SMIME.PKCS7_Error):
s.verify(p7) # Bad signer
def do_test_encrypt(self):
buf = BIO.MemoryBuffer(self.cleartext)
s = SMIME.SMIME()
x509 = X509.load_cert("tests/recipient.pem")
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
with self.assertRaises(ValueError):
SMIME.Cipher("nosuchcipher")
s.set_cipher(SMIME.Cipher("des_ede3_cbc"))
p7 = s.encrypt(buf)
self.assertEqual(len(buf), 0)
self.assertEqual(p7.type(), SMIME.PKCS7_ENVELOPED, p7.type())
self.assertIsInstance(p7, SMIME.PKCS7, p7)
out = BIO.MemoryBuffer()
p7.write(out)
buf = out.read()
self.assertTrue(buf.startswith(b"-----BEGIN PKCS7-----"))
buf = buf.strip()
self.assertTrue(buf.endswith(b"-----END PKCS7-----"))
self.assertGreater(
len(buf),
len(b"-----END PKCS7-----") + len(b"-----BEGIN PKCS7-----"),
)
s.write(out, p7)
return out
def test_encrypt(self):
self.do_test_encrypt()
def test_decrypt(self):
s = SMIME.SMIME()
s.load_key("tests/recipient_key.pem", "tests/recipient.pem")
p7, data = SMIME.smime_load_pkcs7_bio(self.encrypted)
self.assertIsInstance(p7, SMIME.PKCS7, p7)
with self.assertRaises(SMIME.SMIME_Error):
s.verify(p7) # No signer
out = s.decrypt(p7)
self.assertEqual(out, self.cleartext)
def test_decryptBad(self):
s = SMIME.SMIME()
s.load_key("tests/signer_key.pem", "tests/signer.pem")
p7, data = SMIME.smime_load_pkcs7_bio(self.encrypted)
self.assertIsInstance(p7, SMIME.PKCS7, p7)
with self.assertRaises(SMIME.SMIME_Error):
s.verify(p7) # No signer
# Cannot decrypt: no recipient matches certificate
with self.assertRaises(SMIME.PKCS7_Error):
s.decrypt(p7)
def test_signEncryptDecryptVerify(self):
# sign
buf = BIO.MemoryBuffer(self.cleartext)
s = SMIME.SMIME()
s.load_key("tests/signer_key.pem", "tests/signer.pem")
p7 = s.sign(buf)
# encrypt
x509 = X509.load_cert("tests/recipient.pem")
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
s.set_cipher(SMIME.Cipher("des_ede3_cbc"))
tmp = BIO.MemoryBuffer()
s.write(tmp, p7)
p7 = s.encrypt(tmp)
signedEncrypted = BIO.MemoryBuffer()
s.write(signedEncrypted, p7)
# decrypt
s = SMIME.SMIME()
s.load_key("tests/recipient_key.pem", "tests/recipient.pem")
p7, data = SMIME.smime_load_pkcs7_bio(signedEncrypted)
out = s.decrypt(p7)
# verify
x509 = X509.load_cert("tests/signer.pem")
sk = X509.X509_Stack()
sk.push(x509)
s.set_x509_stack(sk)
st = X509.X509_Store()
st.load_info("tests/ca.pem")
s.set_x509_store(st)
p7_bio = BIO.MemoryBuffer(out)
p7, data = SMIME.smime_load_pkcs7_bio(p7_bio)
v = s.verify(p7)
self.assertEqual(v, self.cleartext)
class WriteLoadTestCase(unittest.TestCase):
def setUp(self):
s = SMIME.SMIME()
s.load_key("tests/signer_key.pem", "tests/signer.pem")
p7 = s.sign(BIO.MemoryBuffer(b"some text"))
self.filename = "tests/sig.p7"
with BIO.openfile(self.filename, "wb") as f:
self.assertEqual(p7.write(f), 1)
self.filename_der = "tests/sig.p7.der"
with BIO.openfile(self.filename_der, "wb") as f:
self.assertEqual(p7.write_der(f), 1)
p7 = s.sign(BIO.MemoryBuffer(b"some text"), SMIME.PKCS7_DETACHED)
self.filenameSmime = "tests/sig.p7s"
with BIO.openfile(self.filenameSmime, "wb") as f:
self.assertEqual(s.write(f, p7, BIO.MemoryBuffer(b"some text")), 1)
def tearDown(self):
if os.path.exists(self.filename_der):
os.unlink(self.filename_der)
def test_load_pkcs7(self):
self.assertEqual(SMIME.load_pkcs7(self.filename).type(), SMIME.PKCS7_SIGNED)
def test_load_pkcs7_bio(self):
with open(self.filename, "rb") as f:
buf = BIO.MemoryBuffer(f.read())
self.assertEqual(SMIME.load_pkcs7_bio(buf).type(), SMIME.PKCS7_SIGNED)
def test_load_pkcs7_der(self):
self.assertEqual(
SMIME.load_pkcs7_der(self.filename_der).type(),
SMIME.PKCS7_SIGNED,
)
def test_load_pkcs7_bio_der(self):
with open(self.filename_der, "rb") as f:
buf = BIO.MemoryBuffer(f.read())
self.assertEqual(SMIME.load_pkcs7_bio_der(buf).type(), SMIME.PKCS7_SIGNED)
def test_load_smime(self):
a, b = SMIME.smime_load_pkcs7(self.filenameSmime)
self.assertIsInstance(a, SMIME.PKCS7, a)
self.assertIsInstance(b, BIO.BIO, b)
self.assertEqual(a.type(), SMIME.PKCS7_SIGNED)
def test_load_smime_bio(self):
with open(self.filenameSmime, "rb") as f:
buf = BIO.MemoryBuffer(f.read())
a, b = SMIME.smime_load_pkcs7_bio(buf)
self.assertIsInstance(a, SMIME.PKCS7, a)
self.assertIsInstance(b, BIO.BIO, b)
self.assertEqual(a.type(), SMIME.PKCS7_SIGNED)
def suite():
suite = unittest.TestSuite()
suite.addTest(unittest.TestLoader().loadTestsFromTestCase(SMIMETestCase))
suite.addTest(unittest.TestLoader().loadTestsFromTestCase(WriteLoadTestCase))
return suite
if __name__ == "__main__":
Rand.load_file("randpool.dat", -1)
unittest.TextTestRunner().run(suite())
Rand.save_file("randpool.dat")
|
