GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/pkcs7/pk7_doit.c Lines: 321 612 52.5 %
Date: 2017-11-13 Branches: 181 424 42.7 %

Line Branch Exec Source
1
/* $OpenBSD: pk7_doit.c,v 1.42 2017/05/02 03:59:45 deraadt Exp $ */
2
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3
 * All rights reserved.
4
 *
5
 * This package is an SSL implementation written
6
 * by Eric Young (eay@cryptsoft.com).
7
 * The implementation was written so as to conform with Netscapes SSL.
8
 *
9
 * This library is free for commercial and non-commercial use as long as
10
 * the following conditions are aheared to.  The following conditions
11
 * apply to all code found in this distribution, be it the RC4, RSA,
12
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13
 * included with this distribution is covered by the same copyright terms
14
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15
 *
16
 * Copyright remains Eric Young's, and as such any Copyright notices in
17
 * the code are not to be removed.
18
 * If this package is used in a product, Eric Young should be given attribution
19
 * as the author of the parts of the library used.
20
 * This can be in the form of a textual message at program startup or
21
 * in documentation (online or textual) provided with the package.
22
 *
23
 * Redistribution and use in source and binary forms, with or without
24
 * modification, are permitted provided that the following conditions
25
 * are met:
26
 * 1. Redistributions of source code must retain the copyright
27
 *    notice, this list of conditions and the following disclaimer.
28
 * 2. Redistributions in binary form must reproduce the above copyright
29
 *    notice, this list of conditions and the following disclaimer in the
30
 *    documentation and/or other materials provided with the distribution.
31
 * 3. All advertising materials mentioning features or use of this software
32
 *    must display the following acknowledgement:
33
 *    "This product includes cryptographic software written by
34
 *     Eric Young (eay@cryptsoft.com)"
35
 *    The word 'cryptographic' can be left out if the rouines from the library
36
 *    being used are not cryptographic related :-).
37
 * 4. If you include any Windows specific code (or a derivative thereof) from
38
 *    the apps directory (application code) you must include an acknowledgement:
39
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40
 *
41
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51
 * SUCH DAMAGE.
52
 *
53
 * The licence and distribution terms for any publically available version or
54
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55
 * copied and put under another distribution licence
56
 * [including the GNU Public Licence.]
57
 */
58
59
#include <stdio.h>
60
#include <stdlib.h>
61
#include <string.h>
62
63
#include <openssl/err.h>
64
#include <openssl/objects.h>
65
#include <openssl/x509.h>
66
#include <openssl/x509v3.h>
67
68
static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
69
    void *value);
70
static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
71
72
static int
73
PKCS7_type_is_other(PKCS7* p7)
74
{
75
	int isOther = 1;
76
77
12
	int nid = OBJ_obj2nid(p7->type);
78
79
6
	switch (nid ) {
80
	case NID_pkcs7_data:
81
	case NID_pkcs7_signed:
82
	case NID_pkcs7_enveloped:
83
	case NID_pkcs7_signedAndEnveloped:
84
	case NID_pkcs7_digest:
85
	case NID_pkcs7_encrypted:
86
		isOther = 0;
87
		break;
88
	default:
89
		isOther = 1;
90
6
	}
91
92
6
	return isOther;
93
94
}
95
96
static ASN1_OCTET_STRING *
97
PKCS7_get_octet_string(PKCS7 *p7)
98
{
99
60
	if (PKCS7_type_is_data(p7))
100
24
		return p7->d.data;
101

18
	if (PKCS7_type_is_other(p7) && p7->d.other &&
102
6
	    (p7->d.other->type == V_ASN1_OCTET_STRING))
103
6
		return p7->d.other->value.octet_string;
104
	return NULL;
105
30
}
106
107
static int
108
PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
109
{
110
	BIO *btmp;
111
	const EVP_MD *md;
112
40
	if ((btmp = BIO_new(BIO_f_md())) == NULL) {
113
		PKCS7error(ERR_R_BIO_LIB);
114
		goto err;
115
	}
116
117
20
	md = EVP_get_digestbyobj(alg->algorithm);
118
20
	if (md == NULL) {
119
		PKCS7error(PKCS7_R_UNKNOWN_DIGEST_TYPE);
120
		goto err;
121
	}
122
123
20
	BIO_set_md(btmp, md);
124
20
	if (*pbio == NULL)
125
20
		*pbio = btmp;
126
	else if (!BIO_push(*pbio, btmp)) {
127
		PKCS7error(ERR_R_BIO_LIB);
128
		goto err;
129
	}
130
	btmp = NULL;
131
132
20
	return 1;
133
134
err:
135
	BIO_free(btmp);
136
	return 0;
137
138
20
}
139
140
static int
141
pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri, unsigned char *key, int keylen)
142
{
143
	EVP_PKEY_CTX *pctx = NULL;
144
	EVP_PKEY *pkey = NULL;
145
	unsigned char *ek = NULL;
146
	int ret = 0;
147
6
	size_t eklen;
148
149
3
	pkey = X509_get_pubkey(ri->cert);
150
3
	if (!pkey)
151
		return 0;
152
153
3
	pctx = EVP_PKEY_CTX_new(pkey, NULL);
154
3
	if (!pctx)
155
		return 0;
156
157
3
	if (EVP_PKEY_encrypt_init(pctx) <= 0)
158
		goto err;
159
160
6
	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
161
6
	    EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
162
		PKCS7error(PKCS7_R_CTRL_ERROR);
163
		goto err;
164
	}
165
166
3
	if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
167
		goto err;
168
169
3
	ek = malloc(eklen);
170
171
3
	if (ek == NULL) {
172
		PKCS7error(ERR_R_MALLOC_FAILURE);
173
		goto err;
174
	}
175
176
3
	if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
177
		goto err;
178
179
3
	ASN1_STRING_set0(ri->enc_key, ek, eklen);
180
	ek = NULL;
181
182
3
	ret = 1;
183
184
err:
185
3
	EVP_PKEY_free(pkey);
186
3
	EVP_PKEY_CTX_free(pctx);
187
3
	free(ek);
188
3
	return ret;
189
3
}
190
191
192
static int
193
pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen, PKCS7_RECIP_INFO *ri,
194
    EVP_PKEY *pkey)
195
{
196
	EVP_PKEY_CTX *pctx = NULL;
197
	unsigned char *ek = NULL;
198
6
	size_t eklen;
199
200
	int ret = -1;
201
202
3
	pctx = EVP_PKEY_CTX_new(pkey, NULL);
203
3
	if (!pctx)
204
		return -1;
205
206
3
	if (EVP_PKEY_decrypt_init(pctx) <= 0)
207
		goto err;
208
209
6
	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
210
6
	    EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
211
		PKCS7error(PKCS7_R_CTRL_ERROR);
212
		goto err;
213
	}
214
215
6
	if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
216
6
	    ri->enc_key->data, ri->enc_key->length) <= 0)
217
		goto err;
218
219
3
	ek = malloc(eklen);
220
3
	if (ek == NULL) {
221
		PKCS7error(ERR_R_MALLOC_FAILURE);
222
		goto err;
223
	}
224
225
6
	if (EVP_PKEY_decrypt(pctx, ek, &eklen,
226
6
	    ri->enc_key->data, ri->enc_key->length) <= 0) {
227
		ret = 0;
228
		PKCS7error(ERR_R_EVP_LIB);
229
		goto err;
230
	}
231
232
	ret = 1;
233
234
3
	freezero(*pek, *peklen);
235
236
3
	*pek = ek;
237
3
	*peklen = eklen;
238
239
err:
240
3
	EVP_PKEY_CTX_free(pctx);
241
3
	if (!ret && ek)
242
		free(ek);
243
244
3
	return ret;
245
3
}
246
247
BIO *
248
PKCS7_dataInit(PKCS7 *p7, BIO *bio)
249
{
250
	int i;
251
46
	BIO *out = NULL, *btmp = NULL;
252
	X509_ALGOR *xa = NULL;
253
	const EVP_CIPHER *evp_cipher = NULL;
254
	STACK_OF(X509_ALGOR) *md_sk = NULL;
255
	STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
256
	X509_ALGOR *xalg = NULL;
257
	PKCS7_RECIP_INFO *ri = NULL;
258
	ASN1_OCTET_STRING *os = NULL;
259
260
23
	if (p7 == NULL) {
261
		PKCS7error(PKCS7_R_INVALID_NULL_POINTER);
262
		return NULL;
263
	}
264
265
	/*
266
	 * The content field in the PKCS7 ContentInfo is optional,
267
	 * but that really only applies to inner content (precisely,
268
	 * detached signatures).
269
	 *
270
	 * When reading content, missing outer content is therefore
271
	 * treated as an error.
272
	 *
273
	 * When creating content, PKCS7_content_new() must be called
274
	 * before calling this method, so a NULL p7->d is always
275
	 * an error.
276
	 */
277
23
	if (p7->d.ptr == NULL) {
278
		PKCS7error(PKCS7_R_NO_CONTENT);
279
		return NULL;
280
	}
281
282
46
	i = OBJ_obj2nid(p7->type);
283
46
	p7->state = PKCS7_S_HEADER;
284
285

46
	switch (i) {
286
	case NID_pkcs7_signed:
287
20
		md_sk = p7->d.sign->md_algs;
288
20
		os = PKCS7_get_octet_string(p7->d.sign->contents);
289
20
		break;
290
	case NID_pkcs7_signedAndEnveloped:
291
		rsk = p7->d.signed_and_enveloped->recipientinfo;
292
		md_sk = p7->d.signed_and_enveloped->md_algs;
293
		xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
294
		evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
295
		if (evp_cipher == NULL) {
296
			PKCS7error(PKCS7_R_CIPHER_NOT_INITIALIZED);
297
			goto err;
298
		}
299
		break;
300
	case NID_pkcs7_enveloped:
301
3
		rsk = p7->d.enveloped->recipientinfo;
302
3
		xalg = p7->d.enveloped->enc_data->algorithm;
303
3
		evp_cipher = p7->d.enveloped->enc_data->cipher;
304
3
		if (evp_cipher == NULL) {
305
			PKCS7error(PKCS7_R_CIPHER_NOT_INITIALIZED);
306
			goto err;
307
		}
308
		break;
309
	case NID_pkcs7_digest:
310
		xa = p7->d.digest->md;
311
		os = PKCS7_get_octet_string(p7->d.digest->contents);
312
		break;
313
	case NID_pkcs7_data:
314
		break;
315
	default:
316
		PKCS7error(PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
317
		goto err;
318
	}
319
320
86
	for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
321
20
		if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
322
			goto err;
323
324

23
	if (xa && !PKCS7_bio_add_digest(&out, xa))
325
		goto err;
326
327
23
	if (evp_cipher != NULL) {
328
3
		unsigned char key[EVP_MAX_KEY_LENGTH];
329
3
		unsigned char iv[EVP_MAX_IV_LENGTH];
330
		int keylen, ivlen;
331
3
		EVP_CIPHER_CTX *ctx;
332
333
3
		if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
334
			PKCS7error(ERR_R_BIO_LIB);
335
			goto err;
336
		}
337
3
		BIO_get_cipher_ctx(btmp, &ctx);
338
3
		keylen = EVP_CIPHER_key_length(evp_cipher);
339
3
		ivlen = EVP_CIPHER_iv_length(evp_cipher);
340
3
		xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
341
3
		if (ivlen > 0)
342
3
			arc4random_buf(iv, ivlen);
343
6
		if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL,
344
3
		    NULL, 1) <= 0)
345
			goto err;
346
3
		if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
347
			goto err;
348
3
		if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
349
			goto err;
350
351
3
		if (ivlen > 0) {
352
3
			if (xalg->parameter == NULL) {
353
3
				xalg->parameter = ASN1_TYPE_new();
354
3
				if (xalg->parameter == NULL)
355
					goto err;
356
			}
357
3
			if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
358
				goto err;
359
		}
360
361
		/* Lets do the pub key stuff :-) */
362
12
		for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
363
3
			ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
364
3
			if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
365
				goto err;
366
		}
367
3
		explicit_bzero(key, keylen);
368
369
3
		if (out == NULL)
370
3
			out = btmp;
371
		else
372
			BIO_push(out, btmp);
373
		btmp = NULL;
374
9
	}
375
376
23
	if (bio == NULL) {
377

29
		if (PKCS7_is_detached(p7))
378
3
			bio = BIO_new(BIO_s_null());
379

23
		else if (os && os->length > 0)
380
5
			bio = BIO_new_mem_buf(os->data, os->length);
381
16
		if (bio == NULL) {
382
8
			bio = BIO_new(BIO_s_mem());
383
8
			if (bio == NULL)
384
				goto err;
385
8
			BIO_set_mem_eof_return(bio, 0);
386
8
		}
387
	}
388
23
	if (out)
389
23
		BIO_push(out, bio);
390
	else
391
		out = bio;
392
	bio = NULL;
393
23
	if (0) {
394
err:
395
		if (out != NULL)
396
			BIO_free_all(out);
397
		if (btmp != NULL)
398
			BIO_free_all(btmp);
399
		out = NULL;
400
	}
401
23
	return (out);
402
23
}
403
404
static int
405
pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
406
{
407
	int ret;
408
409
9
	ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
410
3
	    pcert->cert_info->issuer);
411
3
	if (ret)
412
		return ret;
413
6
	return ASN1_STRING_cmp(pcert->cert_info->serialNumber,
414
3
	    ri->issuer_and_serial->serial);
415
3
}
416
417
/* int */
418
BIO *
419
PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
420
{
421
	int i, j;
422
	BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
423
	X509_ALGOR *xa;
424
	ASN1_OCTET_STRING *data_body = NULL;
425
	const EVP_MD *evp_md;
426
	const EVP_CIPHER *evp_cipher = NULL;
427
6
	EVP_CIPHER_CTX *evp_ctx = NULL;
428
	X509_ALGOR *enc_alg = NULL;
429
	STACK_OF(X509_ALGOR) *md_sk = NULL;
430
	STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
431
	PKCS7_RECIP_INFO *ri = NULL;
432
3
	unsigned char *ek = NULL, *tkey = NULL;
433
3
	int eklen = 0, tkeylen = 0;
434
435
3
	if (p7 == NULL) {
436
		PKCS7error(PKCS7_R_INVALID_NULL_POINTER);
437
		return NULL;
438
	}
439
440
3
	if (p7->d.ptr == NULL) {
441
		PKCS7error(PKCS7_R_NO_CONTENT);
442
		return NULL;
443
	}
444
445
3
	i = OBJ_obj2nid(p7->type);
446
3
	p7->state = PKCS7_S_HEADER;
447
448

3
	switch (i) {
449
	case NID_pkcs7_signed:
450
		data_body = PKCS7_get_octet_string(p7->d.sign->contents);
451
		md_sk = p7->d.sign->md_algs;
452
		break;
453
	case NID_pkcs7_signedAndEnveloped:
454
		rsk = p7->d.signed_and_enveloped->recipientinfo;
455
		md_sk = p7->d.signed_and_enveloped->md_algs;
456
		data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
457
		enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
458
		evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
459
		if (evp_cipher == NULL) {
460
			PKCS7error(PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
461
			goto err;
462
		}
463
		break;
464
	case NID_pkcs7_enveloped:
465
3
		rsk = p7->d.enveloped->recipientinfo;
466
3
		enc_alg = p7->d.enveloped->enc_data->algorithm;
467
3
		data_body = p7->d.enveloped->enc_data->enc_data;
468
3
		evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
469
3
		if (evp_cipher == NULL) {
470
			PKCS7error(PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
471
			goto err;
472
		}
473
		break;
474
	default:
475
		PKCS7error(PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
476
		goto err;
477
	}
478
479
	/* We will be checking the signature */
480
3
	if (md_sk != NULL) {
481
		for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
482
			xa = sk_X509_ALGOR_value(md_sk, i);
483
			if ((btmp = BIO_new(BIO_f_md())) == NULL) {
484
				PKCS7error(ERR_R_BIO_LIB);
485
				goto err;
486
			}
487
488
			j = OBJ_obj2nid(xa->algorithm);
489
			evp_md = EVP_get_digestbynid(j);
490
			if (evp_md == NULL) {
491
				PKCS7error(PKCS7_R_UNKNOWN_DIGEST_TYPE);
492
				goto err;
493
			}
494
495
			BIO_set_md(btmp, evp_md);
496
			if (out == NULL)
497
				out = btmp;
498
			else
499
				BIO_push(out, btmp);
500
			btmp = NULL;
501
		}
502
	}
503
504
3
	if (evp_cipher != NULL) {
505
3
		if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
506
			PKCS7error(ERR_R_BIO_LIB);
507
			goto err;
508
		}
509
510
		/* It was encrypted, we need to decrypt the secret key
511
		 * with the private key */
512
513
		/* Find the recipientInfo which matches the passed certificate
514
		 * (if any)
515
		 */
516
3
		if (pcert) {
517
6
			for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
518
3
				ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
519
3
				if (!pkcs7_cmp_ri(ri, pcert))
520
					break;
521
				ri = NULL;
522
			}
523
3
			if (ri == NULL) {
524
				PKCS7error(PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
525
				goto err;
526
			}
527
		}
528
529
		/* If we haven't got a certificate try each ri in turn */
530
3
		if (pcert == NULL) {
531
			/* Always attempt to decrypt all rinfo even
532
			 * after sucess as a defence against MMA timing
533
			 * attacks.
534
			 */
535
			for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
536
				ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
537
538
				if (pkcs7_decrypt_rinfo(&ek, &eklen,
539
				    ri, pkey) < 0)
540
					goto err;
541
				ERR_clear_error();
542
			}
543
		} else {
544
			/* Only exit on fatal errors, not decrypt failure */
545
3
			if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
546
				goto err;
547
3
			ERR_clear_error();
548
		}
549
550
3
		evp_ctx = NULL;
551
3
		BIO_get_cipher_ctx(etmp, &evp_ctx);
552
6
		if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL,
553
3
		    NULL, 0) <= 0)
554
			goto err;
555
3
		if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
556
			goto err;
557
		/* Generate random key as MMA defence */
558
3
		tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
559
3
		tkey = malloc(tkeylen);
560
3
		if (!tkey)
561
			goto err;
562
3
		if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
563
			goto err;
564
3
		if (ek == NULL) {
565
			ek = tkey;
566
			eklen = tkeylen;
567
			tkey = NULL;
568
		}
569
570
3
		if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
571
			/* Some S/MIME clients don't use the same key
572
			 * and effective key length. The key length is
573
			 * determined by the size of the decrypted RSA key.
574
			 */
575
			if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
576
				/* Use random key as MMA defence */
577
				freezero(ek, eklen);
578
				ek = tkey;
579
				eklen = tkeylen;
580
				tkey = NULL;
581
			}
582
		}
583
		/* Clear errors so we don't leak information useful in MMA */
584
3
		ERR_clear_error();
585
3
		if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
586
			goto err;
587
588
3
		freezero(ek, eklen);
589
3
		ek = NULL;
590
3
		freezero(tkey, tkeylen);
591
		tkey = NULL;
592
593
3
		if (out == NULL)
594
3
			out = etmp;
595
		else
596
			BIO_push(out, etmp);
597
		etmp = NULL;
598
3
	}
599
600

6
	if (PKCS7_is_detached(p7) || (in_bio != NULL)) {
601
		bio = in_bio;
602
	} else {
603

6
		if (data_body != NULL && data_body->length > 0)
604
3
			bio = BIO_new_mem_buf(data_body->data, data_body->length);
605
		else {
606
			bio = BIO_new(BIO_s_mem());
607
			BIO_set_mem_eof_return(bio, 0);
608
		}
609
3
		if (bio == NULL)
610
			goto err;
611
	}
612
3
	BIO_push(out, bio);
613
614
3
	if (0) {
615
err:
616
		freezero(ek, eklen);
617
		freezero(tkey, tkeylen);
618
		if (out != NULL)
619
			BIO_free_all(out);
620
		if (btmp != NULL)
621
			BIO_free_all(btmp);
622
		if (etmp != NULL)
623
			BIO_free_all(etmp);
624
		out = NULL;
625
	}
626
3
	return (out);
627
3
}
628
629
static BIO *
630
PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
631
{
632
20
	for (;;) {
633
10
		bio = BIO_find_type(bio, BIO_TYPE_MD);
634
10
		if (bio == NULL) {
635
			PKCS7error(PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
636
			return NULL;
637
		}
638
10
		BIO_get_md_ctx(bio, pmd);
639
10
		if (*pmd == NULL) {
640
			PKCS7error(ERR_R_INTERNAL_ERROR);
641
			return NULL;
642
		}
643
10
		if (EVP_MD_CTX_type(*pmd) == nid)
644
10
			return bio;
645
		bio = BIO_next(bio);
646
	}
647
	return NULL;
648
10
}
649
650
static int
651
do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
652
{
653
20
	unsigned char md_data[EVP_MAX_MD_SIZE];
654
10
	unsigned int md_len;
655
656
	/* Add signing time if not already present */
657
10
	if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
658
10
		if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
659
			PKCS7error(ERR_R_MALLOC_FAILURE);
660
			return 0;
661
		}
662
	}
663
664
	/* Add digest */
665
10
	if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
666
		PKCS7error(ERR_R_EVP_LIB);
667
		return 0;
668
	}
669
10
	if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
670
		PKCS7error(ERR_R_MALLOC_FAILURE);
671
		return 0;
672
	}
673
674
	/* Now sign the attributes */
675
10
	if (!PKCS7_SIGNER_INFO_sign(si))
676
		return 0;
677
678
10
	return 1;
679
10
}
680
681
682
int
683
PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
684
{
685
	int ret = 0;
686
	int i, j;
687
	BIO *btmp;
688
	PKCS7_SIGNER_INFO *si;
689
26
	EVP_MD_CTX *mdc, ctx_tmp;
690
	STACK_OF(X509_ATTRIBUTE) *sk;
691
	STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
692
	ASN1_OCTET_STRING *os = NULL;
693
694
13
	if (p7 == NULL) {
695
		PKCS7error(PKCS7_R_INVALID_NULL_POINTER);
696
		return 0;
697
	}
698
699
13
	if (p7->d.ptr == NULL) {
700
		PKCS7error(PKCS7_R_NO_CONTENT);
701
		return 0;
702
	}
703
704
13
	EVP_MD_CTX_init(&ctx_tmp);
705
13
	i = OBJ_obj2nid(p7->type);
706
13
	p7->state = PKCS7_S_HEADER;
707
708

13
	switch (i) {
709
	case NID_pkcs7_data:
710
		os = p7->d.data;
711
		break;
712
	case NID_pkcs7_signedAndEnveloped:
713
		/* XXX */
714
		si_sk = p7->d.signed_and_enveloped->signer_info;
715
		os = p7->d.signed_and_enveloped->enc_data->enc_data;
716
		if (!os) {
717
			os = ASN1_OCTET_STRING_new();
718
			if (!os) {
719
				PKCS7error(ERR_R_MALLOC_FAILURE);
720
				goto err;
721
			}
722
			p7->d.signed_and_enveloped->enc_data->enc_data = os;
723
		}
724
		break;
725
	case NID_pkcs7_enveloped:
726
		/* XXX */
727
3
		os = p7->d.enveloped->enc_data->enc_data;
728
3
		if (!os) {
729
3
			os = ASN1_OCTET_STRING_new();
730
3
			if (!os) {
731
				PKCS7error(ERR_R_MALLOC_FAILURE);
732
				goto err;
733
			}
734
3
			p7->d.enveloped->enc_data->enc_data = os;
735
3
		}
736
		break;
737
	case NID_pkcs7_signed:
738
10
		si_sk = p7->d.sign->signer_info;
739
10
		os = PKCS7_get_octet_string(p7->d.sign->contents);
740

20
		if (!PKCS7_is_detached(p7) && os == NULL) {
741
			PKCS7error(PKCS7_R_DECODE_ERROR);
742
			goto err;
743
		}
744
		/* If detached data then the content is excluded */
745

18
		if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
746
5
			ASN1_OCTET_STRING_free(os);
747
			os = NULL;
748
5
			p7->d.sign->contents->d.data = NULL;
749
5
		}
750
		break;
751
752
	case NID_pkcs7_digest:
753
		os = PKCS7_get_octet_string(p7->d.digest->contents);
754
		if (os == NULL) {
755
			PKCS7error(PKCS7_R_DECODE_ERROR);
756
			goto err;
757
		}
758
		/* If detached data then the content is excluded */
759
		if (PKCS7_type_is_data(p7->d.digest->contents) &&
760
		    p7->detached) {
761
			ASN1_OCTET_STRING_free(os);
762
			os = NULL;
763
			p7->d.digest->contents->d.data = NULL;
764
		}
765
		break;
766
767
	default:
768
		PKCS7error(PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
769
		goto err;
770
	}
771
772
13
	if (si_sk != NULL) {
773
40
		for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
774
10
			si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
775
10
			if (si->pkey == NULL)
776
				continue;
777
778
10
			j = OBJ_obj2nid(si->digest_alg->algorithm);
779
780
10
			if ((btmp = PKCS7_find_digest(&mdc, bio, j)) == NULL)
781
				goto err;
782
783
			/* We now have the EVP_MD_CTX, lets do the
784
			 * signing. */
785
10
			if (!EVP_MD_CTX_copy_ex(&ctx_tmp, mdc))
786
				goto err;
787
788
10
			sk = si->auth_attr;
789
790
			/* If there are attributes, we add the digest
791
			 * attribute and only sign the attributes */
792
10
			if (sk_X509_ATTRIBUTE_num(sk) > 0) {
793
10
				if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
794
					goto err;
795
			} else {
796
				unsigned char *abuf = NULL;
797
				unsigned int abuflen;
798
				abuflen = EVP_PKEY_size(si->pkey);
799
				abuf = malloc(abuflen);
800
				if (!abuf)
801
					goto err;
802
803
				if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
804
				    si->pkey)) {
805
					PKCS7error(ERR_R_EVP_LIB);
806
					goto err;
807
				}
808
				ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
809
			}
810
		}
811
3
	} else if (i == NID_pkcs7_digest) {
812
		unsigned char md_data[EVP_MAX_MD_SIZE];
813
		unsigned int md_len;
814
815
		if (!PKCS7_find_digest(&mdc, bio,
816
		    OBJ_obj2nid(p7->d.digest->md->algorithm)))
817
			goto err;
818
		if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
819
			goto err;
820
		if (ASN1_STRING_set(p7->d.digest->digest, md_data,
821
		    md_len) == 0)
822
			goto err;
823
	}
824
825

23
	if (!PKCS7_is_detached(p7)) {
826
		/*
827
		 * NOTE: only reach os == NULL here because detached
828
		 * digested data support is broken?
829
		 */
830
8
		if (os == NULL)
831
			goto err;
832
8
		if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
833
8
			char *cont;
834
			long contlen;
835
836
8
			btmp = BIO_find_type(bio, BIO_TYPE_MEM);
837
8
			if (btmp == NULL) {
838
				PKCS7error(PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
839
				goto err;
840
			}
841
8
			contlen = BIO_get_mem_data(btmp, &cont);
842
			/*
843
			 * Mark the BIO read only then we can use its copy
844
			 * of the data instead of making an extra copy.
845
			 */
846
8
			BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
847
8
			BIO_set_mem_eof_return(btmp, 0);
848
8
			ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
849
32
		}
850
	}
851
13
	ret = 1;
852
err:
853
13
	EVP_MD_CTX_cleanup(&ctx_tmp);
854
13
	return (ret);
855
13
}
856
857
int
858
PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
859
{
860
20
	EVP_MD_CTX mctx;
861
10
	EVP_PKEY_CTX *pctx;
862
10
	unsigned char *abuf = NULL;
863
	int alen;
864
10
	size_t siglen;
865
	const EVP_MD *md = NULL;
866
867
10
	md = EVP_get_digestbyobj(si->digest_alg->algorithm);
868
10
	if (md == NULL)
869
		return 0;
870
871
10
	EVP_MD_CTX_init(&mctx);
872
10
	if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
873
		goto err;
874
875
30
	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
876
20
	    EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
877
		PKCS7error(PKCS7_R_CTRL_ERROR);
878
		goto err;
879
	}
880
881
10
	alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
882
	    &PKCS7_ATTR_SIGN_it);
883
10
	if (!abuf)
884
		goto err;
885
10
	if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
886
		goto err;
887
10
	free(abuf);
888
10
	abuf = NULL;
889
10
	if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
890
		goto err;
891
10
	abuf = malloc(siglen);
892
10
	if (!abuf)
893
		goto err;
894
10
	if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
895
		goto err;
896
897
20
	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
898
10
	    EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
899
		PKCS7error(PKCS7_R_CTRL_ERROR);
900
		goto err;
901
	}
902
903
10
	EVP_MD_CTX_cleanup(&mctx);
904
905
10
	ASN1_STRING_set0(si->enc_digest, abuf, siglen);
906
907
10
	return 1;
908
909
err:
910
	free(abuf);
911
	EVP_MD_CTX_cleanup(&mctx);
912
	return 0;
913
10
}
914
915
int
916
PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
917
    PKCS7 *p7, PKCS7_SIGNER_INFO *si)
918
{
919
	PKCS7_ISSUER_AND_SERIAL *ias;
920
	int ret = 0, i;
921
	STACK_OF(X509) *cert;
922
	X509 *x509;
923
924
	if (p7 == NULL) {
925
		PKCS7error(PKCS7_R_INVALID_NULL_POINTER);
926
		return 0;
927
	}
928
929
	if (p7->d.ptr == NULL) {
930
		PKCS7error(PKCS7_R_NO_CONTENT);
931
		return 0;
932
	}
933
934
	if (PKCS7_type_is_signed(p7)) {
935
		cert = p7->d.sign->cert;
936
	} else if (PKCS7_type_is_signedAndEnveloped(p7)) {
937
		cert = p7->d.signed_and_enveloped->cert;
938
	} else {
939
		PKCS7error(PKCS7_R_WRONG_PKCS7_TYPE);
940
		goto err;
941
	}
942
	/* XXXX */
943
	ias = si->issuer_and_serial;
944
945
	x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
946
947
	/* were we able to find the cert in passed to us */
948
	if (x509 == NULL) {
949
		PKCS7error(PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
950
		goto err;
951
	}
952
953
	/* Lets verify */
954
	if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
955
		PKCS7error(ERR_R_X509_LIB);
956
		goto err;
957
	}
958
	if (X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN) == 0) {
959
		X509_STORE_CTX_cleanup(ctx);
960
		goto err;
961
	}
962
	i = X509_verify_cert(ctx);
963
	if (i <= 0) {
964
		PKCS7error(ERR_R_X509_LIB);
965
		X509_STORE_CTX_cleanup(ctx);
966
		goto err;
967
	}
968
	X509_STORE_CTX_cleanup(ctx);
969
970
	return PKCS7_signatureVerify(bio, p7, si, x509);
971
err:
972
973
	return ret;
974
}
975
976
int
977
PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si, X509 *x509)
978
{
979
	ASN1_OCTET_STRING *os;
980
20
	EVP_MD_CTX mdc_tmp, *mdc;
981
	int ret = 0, i;
982
	int md_type;
983
	STACK_OF(X509_ATTRIBUTE) *sk;
984
	BIO *btmp;
985
	EVP_PKEY *pkey;
986
987
10
	EVP_MD_CTX_init(&mdc_tmp);
988
989

10
	if (!PKCS7_type_is_signed(p7) &&
990
	    !PKCS7_type_is_signedAndEnveloped(p7)) {
991
		PKCS7error(PKCS7_R_WRONG_PKCS7_TYPE);
992
		goto err;
993
	}
994
995
10
	md_type = OBJ_obj2nid(si->digest_alg->algorithm);
996
997
	btmp = bio;
998
10
	for (;;) {
999

20
		if ((btmp == NULL) ||
1000
10
		    ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1001
			PKCS7error(PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1002
			goto err;
1003
		}
1004
10
		BIO_get_md_ctx(btmp, &mdc);
1005
10
		if (mdc == NULL) {
1006
			PKCS7error(ERR_R_INTERNAL_ERROR);
1007
			goto err;
1008
		}
1009
10
		if (EVP_MD_CTX_type(mdc) == md_type)
1010
			break;
1011
		/* Workaround for some broken clients that put the signature
1012
		 * OID instead of the digest OID in digest_alg->algorithm
1013
		 */
1014
		if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1015
			break;
1016
		btmp = BIO_next(btmp);
1017
	}
1018
1019
	/* mdc is the digest ctx that we want, unless there are attributes,
1020
	 * in which case the digest is the signed attributes */
1021
10
	if (!EVP_MD_CTX_copy_ex(&mdc_tmp, mdc))
1022
		goto err;
1023
1024
10
	sk = si->auth_attr;
1025

20
	if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1026
10
		unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1027
10
		unsigned int md_len;
1028
		int alen;
1029
		ASN1_OCTET_STRING *message_digest;
1030
1031
10
		if (!EVP_DigestFinal_ex(&mdc_tmp, md_dat, &md_len))
1032
			goto err;
1033
10
		message_digest = PKCS7_digest_from_attributes(sk);
1034
10
		if (!message_digest) {
1035
			PKCS7error(PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1036
			goto err;
1037
		}
1038

20
		if ((message_digest->length != (int)md_len) ||
1039
10
		    (memcmp(message_digest->data, md_dat, md_len))) {
1040
			PKCS7error(PKCS7_R_DIGEST_FAILURE);
1041
			ret = -1;
1042
			goto err;
1043
		}
1044
1045
10
		if (!EVP_VerifyInit_ex(&mdc_tmp, EVP_get_digestbynid(md_type),
1046
		    NULL))
1047
			goto err;
1048
1049
10
		alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1050
		    &PKCS7_ATTR_VERIFY_it);
1051
10
		if (alen <= 0) {
1052
			PKCS7error(ERR_R_ASN1_LIB);
1053
			ret = -1;
1054
			goto err;
1055
		}
1056
10
		if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1057
			goto err;
1058
1059
10
		free(abuf);
1060
40
	}
1061
1062
10
	os = si->enc_digest;
1063
10
	pkey = X509_get_pubkey(x509);
1064
10
	if (!pkey) {
1065
		ret = -1;
1066
		goto err;
1067
	}
1068
1069
10
	i = EVP_VerifyFinal(&mdc_tmp, os->data, os->length, pkey);
1070
10
	EVP_PKEY_free(pkey);
1071
20
	if (i <= 0) {
1072
		PKCS7error(PKCS7_R_SIGNATURE_FAILURE);
1073
		ret = -1;
1074
		goto err;
1075
	} else
1076
		ret = 1;
1077
err:
1078
10
	EVP_MD_CTX_cleanup(&mdc_tmp);
1079
10
	return (ret);
1080
10
}
1081
1082
PKCS7_ISSUER_AND_SERIAL *
1083
PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1084
{
1085
	STACK_OF(PKCS7_RECIP_INFO) *rsk;
1086
	PKCS7_RECIP_INFO *ri;
1087
	int i;
1088
1089
	i = OBJ_obj2nid(p7->type);
1090
	if (i != NID_pkcs7_signedAndEnveloped)
1091
		return NULL;
1092
	if (p7->d.signed_and_enveloped == NULL)
1093
		return NULL;
1094
	rsk = p7->d.signed_and_enveloped->recipientinfo;
1095
	if (rsk == NULL)
1096
		return NULL;
1097
	ri = sk_PKCS7_RECIP_INFO_value(rsk, 0);
1098
	if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1099
		return (NULL);
1100
	ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1101
	return (ri->issuer_and_serial);
1102
}
1103
1104
ASN1_TYPE *
1105
PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1106
{
1107
40
	return (get_attribute(si->auth_attr, nid));
1108
}
1109
1110
ASN1_TYPE *
1111
PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1112
{
1113
	return (get_attribute(si->unauth_attr, nid));
1114
}
1115
1116
static ASN1_TYPE *
1117
get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1118
{
1119
	int i;
1120
	X509_ATTRIBUTE *xa;
1121
	ASN1_OBJECT *o;
1122
1123
60
	o = OBJ_nid2obj(nid);
1124
30
	if (!o || !sk)
1125
8
		return (NULL);
1126
136
	for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1127
58
		xa = sk_X509_ATTRIBUTE_value(sk, i);
1128
58
		if (OBJ_cmp(xa->object, o) == 0) {
1129

24
			if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1130
12
				return (sk_ASN1_TYPE_value(xa->value.set, 0));
1131
			else
1132
				return (NULL);
1133
		}
1134
	}
1135
10
	return (NULL);
1136
30
}
1137
1138
ASN1_OCTET_STRING *
1139
PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1140
{
1141
	ASN1_TYPE *astype;
1142
1143
20
	if (!(astype = get_attribute(sk, NID_pkcs9_messageDigest)))
1144
		return NULL;
1145
10
	if (astype->type != V_ASN1_OCTET_STRING)
1146
		return NULL;
1147
10
	return astype->value.octet_string;
1148
10
}
1149
1150
int
1151
PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1152
    STACK_OF(X509_ATTRIBUTE) *sk)
1153
{
1154
	int i;
1155
1156
	if (p7si->auth_attr != NULL)
1157
		sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,
1158
		    X509_ATTRIBUTE_free);
1159
	p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1160
	if (p7si->auth_attr == NULL)
1161
		return 0;
1162
	for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1163
		if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1164
		    X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk, i))))
1165
		    == NULL)
1166
			return (0);
1167
	}
1168
	return (1);
1169
}
1170
1171
int
1172
PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1173
{
1174
	int i;
1175
1176
	if (p7si->unauth_attr != NULL)
1177
		sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1178
		    X509_ATTRIBUTE_free);
1179
	p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1180
	if (p7si->unauth_attr == NULL)
1181
		return 0;
1182
	for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1183
		if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1184
		    X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk, i))))
1185
		    == NULL)
1186
			return (0);
1187
	}
1188
	return (1);
1189
}
1190
1191
int
1192
PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1193
    void *value)
1194
{
1195
80
	return (add_attribute(&(p7si->auth_attr), nid, atrtype, value));
1196
}
1197
1198
int
1199
PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype, void *value)
1200
{
1201
	return (add_attribute(&(p7si->unauth_attr), nid, atrtype, value));
1202
}
1203
1204
static int
1205
add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype, void *value)
1206
{
1207
	X509_ATTRIBUTE *attr = NULL;
1208
1209
80
	if (*sk == NULL) {
1210
10
		*sk = sk_X509_ATTRIBUTE_new_null();
1211
10
		if (*sk == NULL)
1212
			return 0;
1213
new_attrib:
1214
40
		if (!(attr = X509_ATTRIBUTE_create(nid, atrtype, value)))
1215
			return 0;
1216
40
		if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1217
			X509_ATTRIBUTE_free(attr);
1218
			return 0;
1219
		}
1220
	} else {
1221
		int i;
1222
1223
180
		for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1224
60
			attr = sk_X509_ATTRIBUTE_value(*sk, i);
1225
60
			if (OBJ_obj2nid(attr->object) == nid) {
1226
				X509_ATTRIBUTE_free(attr);
1227
				attr = X509_ATTRIBUTE_create(nid, atrtype,
1228
				    value);
1229
				if (attr == NULL)
1230
					return 0;
1231
				if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1232
					X509_ATTRIBUTE_free(attr);
1233
					return 0;
1234
				}
1235
				goto end;
1236
			}
1237
		}
1238
30
		goto new_attrib;
1239
	}
1240
end:
1241
40
	return (1);
1242
40
}