Outline ![]()
Files ![]()
loading...
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
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
/*
* TLSv1 common routines
* Copyright (c) 2006-2014, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/md5.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
#include "x509v3.h"
#include "tlsv1_common.h"
/*
* TODO:
* RFC 2246 Section 9: Mandatory to implement TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA
* Add support for commonly used cipher suites; don't bother with exportable
* suites.
*/
static const struct tls_cipher_suite tls_cipher_suites[] = {
{ TLS_NULL_WITH_NULL_NULL, TLS_KEY_X_NULL, TLS_CIPHER_NULL,
TLS_HASH_NULL },
{ TLS_RSA_WITH_RC4_128_MD5, TLS_KEY_X_RSA, TLS_CIPHER_RC4_128,
TLS_HASH_MD5 },
{ TLS_RSA_WITH_RC4_128_SHA, TLS_KEY_X_RSA, TLS_CIPHER_RC4_128,
TLS_HASH_SHA },
{ TLS_RSA_WITH_DES_CBC_SHA, TLS_KEY_X_RSA, TLS_CIPHER_DES_CBC,
TLS_HASH_SHA },
{ TLS_RSA_WITH_3DES_EDE_CBC_SHA, TLS_KEY_X_RSA,
TLS_CIPHER_3DES_EDE_CBC, TLS_HASH_SHA },
{ TLS_DHE_RSA_WITH_DES_CBC_SHA, TLS_KEY_X_DHE_RSA, TLS_CIPHER_DES_CBC,
TLS_HASH_SHA},
{ TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA, TLS_KEY_X_DHE_RSA,
TLS_CIPHER_3DES_EDE_CBC, TLS_HASH_SHA },
{ TLS_DH_anon_WITH_RC4_128_MD5, TLS_KEY_X_DH_anon,
TLS_CIPHER_RC4_128, TLS_HASH_MD5 },
{ TLS_DH_anon_WITH_DES_CBC_SHA, TLS_KEY_X_DH_anon,
TLS_CIPHER_DES_CBC, TLS_HASH_SHA },
{ TLS_DH_anon_WITH_3DES_EDE_CBC_SHA, TLS_KEY_X_DH_anon,
TLS_CIPHER_3DES_EDE_CBC, TLS_HASH_SHA },
{ TLS_RSA_WITH_AES_128_CBC_SHA, TLS_KEY_X_RSA, TLS_CIPHER_AES_128_CBC,
TLS_HASH_SHA },
{ TLS_DHE_RSA_WITH_AES_128_CBC_SHA, TLS_KEY_X_DHE_RSA,
TLS_CIPHER_AES_128_CBC, TLS_HASH_SHA },
{ TLS_DH_anon_WITH_AES_128_CBC_SHA, TLS_KEY_X_DH_anon,
TLS_CIPHER_AES_128_CBC, TLS_HASH_SHA },
{ TLS_RSA_WITH_AES_256_CBC_SHA, TLS_KEY_X_RSA, TLS_CIPHER_AES_256_CBC,
TLS_HASH_SHA },
{ TLS_DHE_RSA_WITH_AES_256_CBC_SHA, TLS_KEY_X_DHE_RSA,
TLS_CIPHER_AES_256_CBC, TLS_HASH_SHA },
{ TLS_DH_anon_WITH_AES_256_CBC_SHA, TLS_KEY_X_DH_anon,
TLS_CIPHER_AES_256_CBC, TLS_HASH_SHA },
{ TLS_RSA_WITH_AES_128_CBC_SHA256, TLS_KEY_X_RSA,
TLS_CIPHER_AES_128_CBC, TLS_HASH_SHA256 },
{ TLS_RSA_WITH_AES_256_CBC_SHA256, TLS_KEY_X_RSA,
TLS_CIPHER_AES_256_CBC, TLS_HASH_SHA256 },
{ TLS_DHE_RSA_WITH_AES_128_CBC_SHA256, TLS_KEY_X_DHE_RSA,
TLS_CIPHER_AES_128_CBC, TLS_HASH_SHA256 },
{ TLS_DHE_RSA_WITH_AES_256_CBC_SHA256, TLS_KEY_X_DHE_RSA,
TLS_CIPHER_AES_256_CBC, TLS_HASH_SHA256 },
{ TLS_DH_anon_WITH_AES_128_CBC_SHA256, TLS_KEY_X_DH_anon,
TLS_CIPHER_AES_128_CBC, TLS_HASH_SHA256 },
{ TLS_DH_anon_WITH_AES_256_CBC_SHA256, TLS_KEY_X_DH_anon,
TLS_CIPHER_AES_256_CBC, TLS_HASH_SHA256 }
};
#define NUM_TLS_CIPHER_SUITES ARRAY_SIZE(tls_cipher_suites)
static const struct tls_cipher_data tls_ciphers[] = {
{ TLS_CIPHER_NULL, TLS_CIPHER_STREAM, 0, 0, 0,
CRYPTO_CIPHER_NULL },
{ TLS_CIPHER_IDEA_CBC, TLS_CIPHER_BLOCK, 16, 16, 8,
CRYPTO_CIPHER_NULL },
{ TLS_CIPHER_RC2_CBC_40, TLS_CIPHER_BLOCK, 5, 16, 0,
CRYPTO_CIPHER_ALG_RC2 },
{ TLS_CIPHER_RC4_40, TLS_CIPHER_STREAM, 5, 16, 0,
CRYPTO_CIPHER_ALG_RC4 },
{ TLS_CIPHER_RC4_128, TLS_CIPHER_STREAM, 16, 16, 0,
CRYPTO_CIPHER_ALG_RC4 },
{ TLS_CIPHER_DES40_CBC, TLS_CIPHER_BLOCK, 5, 8, 8,
CRYPTO_CIPHER_ALG_DES },
{ TLS_CIPHER_DES_CBC, TLS_CIPHER_BLOCK, 8, 8, 8,
CRYPTO_CIPHER_ALG_DES },
{ TLS_CIPHER_3DES_EDE_CBC, TLS_CIPHER_BLOCK, 24, 24, 8,
CRYPTO_CIPHER_ALG_3DES },
{ TLS_CIPHER_AES_128_CBC, TLS_CIPHER_BLOCK, 16, 16, 16,
CRYPTO_CIPHER_ALG_AES },
{ TLS_CIPHER_AES_256_CBC, TLS_CIPHER_BLOCK, 32, 32, 16,
CRYPTO_CIPHER_ALG_AES }
};
#define NUM_TLS_CIPHER_DATA ARRAY_SIZE(tls_ciphers)
/**
* tls_get_cipher_suite - Get TLS cipher suite
* @suite: Cipher suite identifier
* Returns: Pointer to the cipher data or %NULL if not found
*/
const struct tls_cipher_suite * tls_get_cipher_suite(u16 suite)
{
size_t i;
for (i = 0; i < NUM_TLS_CIPHER_SUITES; i++)
if (tls_cipher_suites[i].suite == suite)
return &tls_cipher_suites[i];
return NULL;
}
const struct tls_cipher_data * tls_get_cipher_data(tls_cipher cipher)
{
size_t i;
for (i = 0; i < NUM_TLS_CIPHER_DATA; i++)
if (tls_ciphers[i].cipher == cipher)
return &tls_ciphers[i];
return NULL;
}
int tls_server_key_exchange_allowed(tls_cipher cipher)
{
const struct tls_cipher_suite *suite;
/* RFC 2246, Section 7.4.3 */
suite = tls_get_cipher_suite(cipher);
if (suite == NULL)
return 0;
switch (suite->key_exchange) {
case TLS_KEY_X_DHE_DSS:
case TLS_KEY_X_DHE_DSS_EXPORT:
case TLS_KEY_X_DHE_RSA:
case TLS_KEY_X_DHE_RSA_EXPORT:
case TLS_KEY_X_DH_anon_EXPORT:
case TLS_KEY_X_DH_anon:
return 1;
case TLS_KEY_X_RSA_EXPORT:
return 1 /* FIX: public key len > 512 bits */;
default:
return 0;
}
}
/**
* tls_parse_cert - Parse DER encoded X.509 certificate and get public key
* @buf: ASN.1 DER encoded certificate
* @len: Length of the buffer
* @pk: Buffer for returning the allocated public key
* Returns: 0 on success, -1 on failure
*
* This functions parses an ASN.1 DER encoded X.509 certificate and retrieves
* the public key from it. The caller is responsible for freeing the public key
* by calling crypto_public_key_free().
*/
int tls_parse_cert(const u8 *buf, size_t len, struct crypto_public_key **pk)
{
struct x509_certificate *cert;
wpa_hexdump(MSG_MSGDUMP, "TLSv1: Parse ASN.1 DER certificate",
buf, len);
*pk = crypto_public_key_from_cert(buf, len);
if (*pk)
return 0;
cert = x509_certificate_parse(buf, len);
if (cert == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse X.509 "
"certificate");
return -1;
}
/* TODO
* verify key usage (must allow encryption)
*
* All certificate profiles, key and cryptographic formats are
* defined by the IETF PKIX working group [PKIX]. When a key
* usage extension is present, the digitalSignature bit must be
* set for the key to be eligible for signing, as described
* above, and the keyEncipherment bit must be present to allow
* encryption, as described above. The keyAgreement bit must be
* set on Diffie-Hellman certificates. (PKIX: RFC 3280)
*/
*pk = crypto_public_key_import(cert->public_key, cert->public_key_len);
x509_certificate_free(cert);
if (*pk == NULL) {
wpa_printf(MSG_ERROR, "TLSv1: Failed to import "
"server public key");
return -1;
}
return 0;
}
int tls_verify_hash_init(struct tls_verify_hash *verify)
{
tls_verify_hash_free(verify);
verify->md5_client = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, 0);
verify->md5_server = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, 0);
verify->md5_cert = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, 0);
verify->sha1_client = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, 0);
verify->sha1_server = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, 0);
verify->sha1_cert = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, 0);
if (verify->md5_client == NULL || verify->md5_server == NULL ||
verify->md5_cert == NULL || verify->sha1_client == NULL ||
verify->sha1_server == NULL || verify->sha1_cert == NULL) {
tls_verify_hash_free(verify);
return -1;
}
#ifdef CONFIG_TLSV12
verify->sha256_client = crypto_hash_init(CRYPTO_HASH_ALG_SHA256, NULL,
0);
verify->sha256_server = crypto_hash_init(CRYPTO_HASH_ALG_SHA256, NULL,
0);
verify->sha256_cert = crypto_hash_init(CRYPTO_HASH_ALG_SHA256, NULL,
0);
if (verify->sha256_client == NULL || verify->sha256_server == NULL ||
verify->sha256_cert == NULL) {
tls_verify_hash_free(verify);
return -1;
}
#endif /* CONFIG_TLSV12 */
return 0;
}
void tls_verify_hash_add(struct tls_verify_hash *verify, const u8 *buf,
size_t len)
{
if (verify->md5_client && verify->sha1_client) {
crypto_hash_update(verify->md5_client, buf, len);
crypto_hash_update(verify->sha1_client, buf, len);
}
if (verify->md5_server && verify->sha1_server) {
crypto_hash_update(verify->md5_server, buf, len);
crypto_hash_update(verify->sha1_server, buf, len);
}
if (verify->md5_cert && verify->sha1_cert) {
crypto_hash_update(verify->md5_cert, buf, len);
crypto_hash_update(verify->sha1_cert, buf, len);
}
#ifdef CONFIG_TLSV12
if (verify->sha256_client)
crypto_hash_update(verify->sha256_client, buf, len);
if (verify->sha256_server)
crypto_hash_update(verify->sha256_server, buf, len);
if (verify->sha256_cert)
crypto_hash_update(verify->sha256_cert, buf, len);
#endif /* CONFIG_TLSV12 */
}
void tls_verify_hash_free(struct tls_verify_hash *verify)
{
crypto_hash_finish(verify->md5_client, NULL, NULL);
crypto_hash_finish(verify->md5_server, NULL, NULL);
crypto_hash_finish(verify->md5_cert, NULL, NULL);
crypto_hash_finish(verify->sha1_client, NULL, NULL);
crypto_hash_finish(verify->sha1_server, NULL, NULL);
crypto_hash_finish(verify->sha1_cert, NULL, NULL);
verify->md5_client = NULL;
verify->md5_server = NULL;
verify->md5_cert = NULL;
verify->sha1_client = NULL;
verify->sha1_server = NULL;
verify->sha1_cert = NULL;
#ifdef CONFIG_TLSV12
crypto_hash_finish(verify->sha256_client, NULL, NULL);
crypto_hash_finish(verify->sha256_server, NULL, NULL);
crypto_hash_finish(verify->sha256_cert, NULL, NULL);
verify->sha256_client = NULL;
verify->sha256_server = NULL;
verify->sha256_cert = NULL;
#endif /* CONFIG_TLSV12 */
}
int tls_version_ok(u16 ver)
{
if (ver == TLS_VERSION_1)
return 1;
#ifdef CONFIG_TLSV11
if (ver == TLS_VERSION_1_1)
return 1;
#endif /* CONFIG_TLSV11 */
#ifdef CONFIG_TLSV12
if (ver == TLS_VERSION_1_2)
return 1;
#endif /* CONFIG_TLSV12 */
return 0;
}
const char * tls_version_str(u16 ver)
{
switch (ver) {
case TLS_VERSION_1:
return "1.0";
case TLS_VERSION_1_1:
return "1.1";
case TLS_VERSION_1_2:
return "1.2";
}
return "?";
}
int tls_prf(u16 ver, const u8 *secret, size_t secret_len, const char *label,
const u8 *seed, size_t seed_len, u8 *out, size_t outlen)
{
#ifdef CONFIG_TLSV12
if (ver >= TLS_VERSION_1_2) {
tls_prf_sha256(secret, secret_len, label, seed, seed_len,
out, outlen);
return 0;
}
#endif /* CONFIG_TLSV12 */
return tls_prf_sha1_md5(secret, secret_len, label, seed, seed_len, out,
outlen);
}
#ifdef CONFIG_TLSV12
int tlsv12_key_x_server_params_hash(u16 tls_version, u8 hash_alg,
const u8 *client_random,
const u8 *server_random,
const u8 *server_params,
size_t server_params_len, u8 *hash)
{
size_t hlen;
struct crypto_hash *ctx;
enum crypto_hash_alg alg;
switch (hash_alg) {
case TLS_HASH_ALG_SHA256:
alg = CRYPTO_HASH_ALG_SHA256;
hlen = SHA256_MAC_LEN;
break;
#ifdef CONFIG_CRYPTO_MBEDTLS
case TLS_HASH_ALG_SHA384:
alg = CRYPTO_HASH_ALG_SHA384;
hlen = 48;
break;
case TLS_HASH_ALG_SHA512:
alg = CRYPTO_HASH_ALG_SHA512;
hlen = 64;
break;
#endif
default:
return -1;
}
ctx = crypto_hash_init(alg, NULL, 0);
if (ctx == NULL)
return -1;
crypto_hash_update(ctx, client_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_params, server_params_len);
if (crypto_hash_finish(ctx, hash, &hlen) < 0)
return -1;
return hlen;
}
#endif /* CONFIG_TLSV12 */
int tls_key_x_server_params_hash(u16 tls_version, const u8 *client_random,
const u8 *server_random,
const u8 *server_params,
size_t server_params_len, u8 *hash, size_t hsz)
{
u8 *hpos;
size_t hlen;
struct crypto_hash *ctx;
hpos = hash;
ctx = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, 0);
if (ctx == NULL)
return -1;
crypto_hash_update(ctx, client_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_params, server_params_len);
hlen = MD5_MAC_LEN;
if (hsz < hlen)
return -1;
if (crypto_hash_finish(ctx, hash, &hlen) < 0)
return -1;
hpos += hlen;
ctx = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL, 0);
if (ctx == NULL)
return -1;
crypto_hash_update(ctx, client_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_random, TLS_RANDOM_LEN);
crypto_hash_update(ctx, server_params, server_params_len);
hlen = hsz - hlen;
if (crypto_hash_finish(ctx, hpos, &hlen) < 0)
return -1;
hpos += hlen;
return hpos - hash;
}
int tls_verify_signature(u16 tls_version, struct crypto_public_key *pk,
const u8 *data, size_t data_len,
const u8 *pos, size_t len, u8 *alert)
{
u8 *buf;
const u8 *end = pos + len;
const u8 *decrypted;
u16 slen;
size_t buflen;
if (end - pos < 2) {
*alert = TLS_ALERT_DECODE_ERROR;
return -1;
}
slen = WPA_GET_BE16(pos);
pos += 2;
if (end - pos < slen) {
*alert = TLS_ALERT_DECODE_ERROR;
return -1;
}
if (end - pos > slen) {
wpa_hexdump(MSG_MSGDUMP, "Additional data after Signature",
pos + slen, end - pos - slen);
end = pos + slen;
}
wpa_hexdump(MSG_MSGDUMP, "TLSv1: Signature", pos, end - pos);
if (pk == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: No public key to verify signature");
*alert = TLS_ALERT_INTERNAL_ERROR;
return -1;
}
buflen = end - pos;
buf = os_malloc(end - pos);
if (buf == NULL) {
*alert = TLS_ALERT_INTERNAL_ERROR;
return -1;
}
if (crypto_public_key_decrypt_pkcs1(pk, pos, end - pos, buf, &buflen) <
0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt signature");
os_free(buf);
*alert = TLS_ALERT_DECRYPT_ERROR;
return -1;
}
decrypted = buf;
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Decrypted Signature",
decrypted, buflen);
#ifdef CONFIG_TLSV12
if (tls_version >= TLS_VERSION_1_2) {
/*
* RFC 3447, A.2.4 RSASSA-PKCS1-v1_5
*
* DigestInfo ::= SEQUENCE {
* digestAlgorithm DigestAlgorithm,
* digest OCTET STRING
* }
*
* SHA-256 OID: sha256WithRSAEncryption ::= {pkcs-1 11}
*
* DER encoded DigestInfo for SHA256 per RFC 3447:
* 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20 ||
* H
*/
if (buflen >= 19 + 32 &&
os_memcmp(buf, "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01"
"\x65\x03\x04\x02\x01\x05\x00\x04\x20", 19) == 0)
{
wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithm = SHA-256");
decrypted = buf + 19;
buflen -= 19;
} else if (buflen >= 19 + 48 &&
os_memcmp(buf, "\x30\x41\x30\x0d\x06\x09\x60\x86\x48\x01"
"\x65\x03\x04\x02\x02\x05\x00\x04\x30", 19) == 0)
{
wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithm = SHA-384");
decrypted = buf + 19;
buflen -= 19;
} else if (buflen >= 19 + 64 &&
os_memcmp(buf, "\x30\x51\x30\x0d\x06\x09\x60\x86\x48\x01"
"\x65\x03\x04\x02\x03\x05\x00\x04\x40", 19) == 0)
{
wpa_printf(MSG_DEBUG, "TLSv1.2: DigestAlgorithm = SHA-512");
decrypted = buf + 19;
buflen -= 19;
} else {
wpa_printf(MSG_DEBUG, "TLSv1.2: Unrecognized DigestInfo");
os_free(buf);
*alert = TLS_ALERT_DECRYPT_ERROR;
return -1;
}
}
#endif /* CONFIG_TLSV12 */
if (buflen != data_len ||
os_memcmp_const(decrypted, data, data_len) != 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Invalid Signature in CertificateVerify - did not match calculated hash");
os_free(buf);
*alert = TLS_ALERT_DECRYPT_ERROR;
return -1;
}
os_free(buf);
return 0;
}
Details ![]()
Show: from Types: Columns: ![]( "Show Project Names")
![]( "Show Locations")
![]( "Show Referring Symbols")
![]( "Show Scope")
This file uses the notable symbols shown below. Click anywhere in the file to view more details.