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source: vbox/trunk/src/libs/openssl-3.3.2/crypto/pkcs7/pk7_doit.c@ 108358

最後變更 在這個檔案從108358是 108206,由 vboxsync 提交於 6 週 前

openssl-3.3.2: Exported all files to OSE and removed .scm-settings ​bugref:10757
  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Author Date Id Revision
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1/*
2 * Copyright 1995-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <openssl/rand.h>
12#include <openssl/objects.h>
13#include <openssl/x509.h>
14#include <openssl/x509v3.h>
15#include <openssl/err.h>
16#include "internal/cryptlib.h"
17#include "internal/sizes.h"
18#include "crypto/evp.h"
19#include "pk7_local.h"
20
21static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
22 void *value);
23static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid);
24
25int PKCS7_type_is_other(PKCS7 *p7)
26{
27 int isOther = 1;
28
29 int nid = OBJ_obj2nid(p7->type);
30
31 switch (nid) {
32 case NID_pkcs7_data:
33 case NID_pkcs7_signed:
34 case NID_pkcs7_enveloped:
35 case NID_pkcs7_signedAndEnveloped:
36 case NID_pkcs7_digest:
37 case NID_pkcs7_encrypted:
38 isOther = 0;
39 break;
40 default:
41 isOther = 1;
42 }
43
44 return isOther;
45
46}
47
48ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
49{
50 if (PKCS7_type_is_data(p7))
51 return p7->d.data;
52 if (PKCS7_type_is_other(p7) && p7->d.other
53 && (p7->d.other->type == V_ASN1_OCTET_STRING))
54 return p7->d.other->value.octet_string;
55 return NULL;
56}
57
58static int pkcs7_bio_add_digest(BIO **pbio, X509_ALGOR *alg,
59 const PKCS7_CTX *ctx)
60{
61 BIO *btmp;
62 char name[OSSL_MAX_NAME_SIZE];
63 EVP_MD *fetched = NULL;
64 const EVP_MD *md;
65
66 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
67 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
68 goto err;
69 }
70
71 OBJ_obj2txt(name, sizeof(name), alg->algorithm, 0);
72
73 (void)ERR_set_mark();
74 fetched = EVP_MD_fetch(ossl_pkcs7_ctx_get0_libctx(ctx), name,
75 ossl_pkcs7_ctx_get0_propq(ctx));
76 if (fetched != NULL)
77 md = fetched;
78 else
79 md = EVP_get_digestbyname(name);
80
81 if (md == NULL) {
82 (void)ERR_clear_last_mark();
83 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
84 goto err;
85 }
86 (void)ERR_pop_to_mark();
87
88 if (BIO_set_md(btmp, md) <= 0) {
89 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
90 EVP_MD_free(fetched);
91 goto err;
92 }
93 EVP_MD_free(fetched);
94 if (*pbio == NULL)
95 *pbio = btmp;
96 else if (!BIO_push(*pbio, btmp)) {
97 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
98 goto err;
99 }
100 btmp = NULL;
101
102 return 1;
103
104 err:
105 BIO_free(btmp);
106 return 0;
107}
108
109static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
110 unsigned char *key, int keylen)
111{
112 EVP_PKEY_CTX *pctx = NULL;
113 EVP_PKEY *pkey = NULL;
114 unsigned char *ek = NULL;
115 int ret = 0;
116 size_t eklen;
117 const PKCS7_CTX *ctx = ri->ctx;
118
119 pkey = X509_get0_pubkey(ri->cert);
120 if (pkey == NULL)
121 return 0;
122
123 pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
124 ossl_pkcs7_ctx_get0_propq(ctx));
125 if (pctx == NULL)
126 return 0;
127
128 if (EVP_PKEY_encrypt_init(pctx) <= 0)
129 goto err;
130
131 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
132 goto err;
133
134 ek = OPENSSL_malloc(eklen);
135 if (ek == NULL)
136 goto err;
137
138 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
139 goto err;
140
141 ASN1_STRING_set0(ri->enc_key, ek, eklen);
142 ek = NULL;
143
144 ret = 1;
145
146 err:
147 EVP_PKEY_CTX_free(pctx);
148 OPENSSL_free(ek);
149 return ret;
150
151}
152
153static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
154 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
155 size_t fixlen)
156{
157 EVP_PKEY_CTX *pctx = NULL;
158 unsigned char *ek = NULL;
159 size_t eklen;
160 int ret = -1;
161 const PKCS7_CTX *ctx = ri->ctx;
162
163 pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
164 ossl_pkcs7_ctx_get0_propq(ctx));
165 if (pctx == NULL)
166 return -1;
167
168 if (EVP_PKEY_decrypt_init(pctx) <= 0)
169 goto err;
170
171 if (EVP_PKEY_is_a(pkey, "RSA"))
172 /* upper layer pkcs7 code incorrectly assumes that a successful RSA
173 * decryption means that the key matches ciphertext (which never
174 * was the case, implicit rejection or not), so to make it work
175 * disable implicit rejection for RSA keys */
176 EVP_PKEY_CTX_ctrl_str(pctx, "rsa_pkcs1_implicit_rejection", "0");
177
178 ret = evp_pkey_decrypt_alloc(pctx, &ek, &eklen, fixlen,
179 ri->enc_key->data, ri->enc_key->length);
180 if (ret <= 0)
181 goto err;
182
183 ret = 1;
184
185 OPENSSL_clear_free(*pek, *peklen);
186 *pek = ek;
187 *peklen = eklen;
188
189 err:
190 EVP_PKEY_CTX_free(pctx);
191 if (!ret)
192 OPENSSL_free(ek);
193
194 return ret;
195}
196
197BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
198{
199 int i;
200 BIO *out = NULL, *btmp = NULL;
201 X509_ALGOR *xa = NULL;
202 EVP_CIPHER *fetched_cipher = NULL;
203 const EVP_CIPHER *cipher;
204 const EVP_CIPHER *evp_cipher = NULL;
205 STACK_OF(X509_ALGOR) *md_sk = NULL;
206 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
207 X509_ALGOR *xalg = NULL;
208 PKCS7_RECIP_INFO *ri = NULL;
209 ASN1_OCTET_STRING *os = NULL;
210 const PKCS7_CTX *p7_ctx;
211 OSSL_LIB_CTX *libctx;
212 const char *propq;
213
214 if (p7 == NULL) {
215 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
216 return NULL;
217 }
218 p7_ctx = ossl_pkcs7_get0_ctx(p7);
219 libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
220 propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
221
222 /*
223 * The content field in the PKCS7 ContentInfo is optional, but that really
224 * only applies to inner content (precisely, detached signatures).
225 *
226 * When reading content, missing outer content is therefore treated as an
227 * error.
228 *
229 * When creating content, PKCS7_content_new() must be called before
230 * calling this method, so a NULL p7->d is always an error.
231 */
232 if (p7->d.ptr == NULL) {
233 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
234 return NULL;
235 }
236
237 i = OBJ_obj2nid(p7->type);
238 p7->state = PKCS7_S_HEADER;
239
240 switch (i) {
241 case NID_pkcs7_signed:
242 md_sk = p7->d.sign->md_algs;
243 os = PKCS7_get_octet_string(p7->d.sign->contents);
244 break;
245 case NID_pkcs7_signedAndEnveloped:
246 rsk = p7->d.signed_and_enveloped->recipientinfo;
247 md_sk = p7->d.signed_and_enveloped->md_algs;
248 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
249 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
250 if (evp_cipher == NULL) {
251 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
252 goto err;
253 }
254 break;
255 case NID_pkcs7_enveloped:
256 rsk = p7->d.enveloped->recipientinfo;
257 xalg = p7->d.enveloped->enc_data->algorithm;
258 evp_cipher = p7->d.enveloped->enc_data->cipher;
259 if (evp_cipher == NULL) {
260 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
261 goto err;
262 }
263 break;
264 case NID_pkcs7_digest:
265 xa = p7->d.digest->md;
266 os = PKCS7_get_octet_string(p7->d.digest->contents);
267 break;
268 case NID_pkcs7_data:
269 break;
270 default:
271 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
272 goto err;
273 }
274
275 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
276 if (!pkcs7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i), p7_ctx))
277 goto err;
278
279 if (xa && !pkcs7_bio_add_digest(&out, xa, p7_ctx))
280 goto err;
281
282 if (evp_cipher != NULL) {
283 unsigned char key[EVP_MAX_KEY_LENGTH];
284 unsigned char iv[EVP_MAX_IV_LENGTH];
285 int keylen, ivlen;
286 EVP_CIPHER_CTX *ctx;
287
288 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
289 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
290 goto err;
291 }
292 BIO_get_cipher_ctx(btmp, &ctx);
293 keylen = EVP_CIPHER_get_key_length(evp_cipher);
294 ivlen = EVP_CIPHER_get_iv_length(evp_cipher);
295 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_get_type(evp_cipher));
296 if (ivlen > 0)
297 if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
298 goto err;
299
300 (void)ERR_set_mark();
301 fetched_cipher = EVP_CIPHER_fetch(libctx,
302 EVP_CIPHER_get0_name(evp_cipher),
303 propq);
304 (void)ERR_pop_to_mark();
305 if (fetched_cipher != NULL)
306 cipher = fetched_cipher;
307 else
308 cipher = evp_cipher;
309
310 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, 1) <= 0)
311 goto err;
312
313 EVP_CIPHER_free(fetched_cipher);
314 fetched_cipher = NULL;
315
316 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
317 goto err;
318 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
319 goto err;
320
321 if (ivlen > 0) {
322 if (xalg->parameter == NULL) {
323 xalg->parameter = ASN1_TYPE_new();
324 if (xalg->parameter == NULL)
325 goto err;
326 }
327 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) <= 0)
328 goto err;
329 }
330
331 /* Lets do the pub key stuff :-) */
332 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
333 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
334 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
335 goto err;
336 }
337 OPENSSL_cleanse(key, keylen);
338
339 if (out == NULL)
340 out = btmp;
341 else
342 BIO_push(out, btmp);
343 btmp = NULL;
344 }
345
346 if (bio == NULL) {
347 if (PKCS7_is_detached(p7)) {
348 bio = BIO_new(BIO_s_null());
349 } else if (os && os->length > 0) {
350 bio = BIO_new_mem_buf(os->data, os->length);
351 } else {
352 bio = BIO_new(BIO_s_mem());
353 if (bio == NULL)
354 goto err;
355 BIO_set_mem_eof_return(bio, 0);
356 }
357 if (bio == NULL)
358 goto err;
359 }
360 if (out)
361 BIO_push(out, bio);
362 else
363 out = bio;
364 return out;
365
366 err:
367 EVP_CIPHER_free(fetched_cipher);
368 BIO_free_all(out);
369 BIO_free_all(btmp);
370 return NULL;
371}
372
373static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
374{
375 int ret;
376 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
377 X509_get_issuer_name(pcert));
378 if (ret)
379 return ret;
380 return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
381 ri->issuer_and_serial->serial);
382}
383
384/* int */
385BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
386{
387 int i, len;
388 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
389 X509_ALGOR *xa;
390 ASN1_OCTET_STRING *data_body = NULL;
391 EVP_MD *evp_md = NULL;
392 const EVP_MD *md;
393 EVP_CIPHER *evp_cipher = NULL;
394 const EVP_CIPHER *cipher = NULL;
395 EVP_CIPHER_CTX *evp_ctx = NULL;
396 X509_ALGOR *enc_alg = NULL;
397 STACK_OF(X509_ALGOR) *md_sk = NULL;
398 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
399 PKCS7_RECIP_INFO *ri = NULL;
400 unsigned char *ek = NULL, *tkey = NULL;
401 int eklen = 0, tkeylen = 0;
402 char name[OSSL_MAX_NAME_SIZE];
403 const PKCS7_CTX *p7_ctx;
404 OSSL_LIB_CTX *libctx;
405 const char *propq;
406
407 if (p7 == NULL) {
408 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
409 return NULL;
410 }
411
412 p7_ctx = ossl_pkcs7_get0_ctx(p7);
413 libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
414 propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
415
416 if (p7->d.ptr == NULL) {
417 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
418 return NULL;
419 }
420
421 i = OBJ_obj2nid(p7->type);
422 p7->state = PKCS7_S_HEADER;
423
424 switch (i) {
425 case NID_pkcs7_signed:
426 /*
427 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
428 * field and optional content.
429 * data_body is NULL if that structure has no (=detached) content
430 * or if the contentType is wrong (i.e., not "data").
431 */
432 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
433 if (!PKCS7_is_detached(p7) && data_body == NULL) {
434 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_SIGNED_DATA_TYPE);
435 goto err;
436 }
437 md_sk = p7->d.sign->md_algs;
438 break;
439 case NID_pkcs7_signedAndEnveloped:
440 rsk = p7->d.signed_and_enveloped->recipientinfo;
441 md_sk = p7->d.signed_and_enveloped->md_algs;
442 /* data_body is NULL if the optional EncryptedContent is missing. */
443 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
444 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
445
446 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
447
448 (void)ERR_set_mark();
449 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
450 if (evp_cipher != NULL)
451 cipher = evp_cipher;
452 else
453 cipher = EVP_get_cipherbyname(name);
454
455 if (cipher == NULL) {
456 (void)ERR_clear_last_mark();
457 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
458 goto err;
459 }
460 (void)ERR_pop_to_mark();
461 break;
462 case NID_pkcs7_enveloped:
463 rsk = p7->d.enveloped->recipientinfo;
464 enc_alg = p7->d.enveloped->enc_data->algorithm;
465 /* data_body is NULL if the optional EncryptedContent is missing. */
466 data_body = p7->d.enveloped->enc_data->enc_data;
467 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
468
469 (void)ERR_set_mark();
470 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
471 if (evp_cipher != NULL)
472 cipher = evp_cipher;
473 else
474 cipher = EVP_get_cipherbyname(name);
475
476 if (cipher == NULL) {
477 (void)ERR_clear_last_mark();
478 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
479 goto err;
480 }
481 (void)ERR_pop_to_mark();
482 break;
483 default:
484 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
485 goto err;
486 }
487
488 /* Detached content must be supplied via in_bio instead. */
489 if (data_body == NULL && in_bio == NULL) {
490 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
491 goto err;
492 }
493
494 /* We will be checking the signature */
495 if (md_sk != NULL) {
496 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
497 xa = sk_X509_ALGOR_value(md_sk, i);
498 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
499 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
500 goto err;
501 }
502
503 OBJ_obj2txt(name, sizeof(name), xa->algorithm, 0);
504
505 (void)ERR_set_mark();
506 evp_md = EVP_MD_fetch(libctx, name, propq);
507 if (evp_md != NULL)
508 md = evp_md;
509 else
510 md = EVP_get_digestbyname(name);
511
512 if (md == NULL) {
513 (void)ERR_clear_last_mark();
514 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
515 goto err;
516 }
517 (void)ERR_pop_to_mark();
518
519 if (BIO_set_md(btmp, md) <= 0) {
520 EVP_MD_free(evp_md);
521 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
522 goto err;
523 }
524 EVP_MD_free(evp_md);
525 if (out == NULL)
526 out = btmp;
527 else
528 BIO_push(out, btmp);
529 btmp = NULL;
530 }
531 }
532
533 if (cipher != NULL) {
534 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
535 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
536 goto err;
537 }
538
539 /*
540 * It was encrypted, we need to decrypt the secret key with the
541 * private key
542 */
543
544 /*
545 * Find the recipientInfo which matches the passed certificate (if
546 * any)
547 */
548
549 if (pcert) {
550 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
551 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
552 if (!pkcs7_cmp_ri(ri, pcert))
553 break;
554 ri = NULL;
555 }
556 if (ri == NULL) {
557 ERR_raise(ERR_LIB_PKCS7,
558 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
559 goto err;
560 }
561 }
562
563 /* If we haven't got a certificate try each ri in turn */
564 if (pcert == NULL) {
565 /*
566 * Always attempt to decrypt all rinfo even after success as a
567 * defence against MMA timing attacks.
568 */
569 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
570 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
571 ri->ctx = p7_ctx;
572 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
573 EVP_CIPHER_get_key_length(cipher)) < 0)
574 goto err;
575 ERR_clear_error();
576 }
577 } else {
578 ri->ctx = p7_ctx;
579 /* Only exit on fatal errors, not decrypt failure */
580 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
581 goto err;
582 ERR_clear_error();
583 }
584
585 evp_ctx = NULL;
586 BIO_get_cipher_ctx(etmp, &evp_ctx);
587 if (EVP_CipherInit_ex(evp_ctx, cipher, NULL, NULL, NULL, 0) <= 0)
588 goto err;
589 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) <= 0)
590 goto err;
591 /* Generate random key as MMA defence */
592 len = EVP_CIPHER_CTX_get_key_length(evp_ctx);
593 if (len <= 0)
594 goto err;
595 tkeylen = (size_t)len;
596 tkey = OPENSSL_malloc(tkeylen);
597 if (tkey == NULL)
598 goto err;
599 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
600 goto err;
601 if (ek == NULL) {
602 ek = tkey;
603 eklen = tkeylen;
604 tkey = NULL;
605 }
606
607 if (eklen != EVP_CIPHER_CTX_get_key_length(evp_ctx)) {
608 /*
609 * Some S/MIME clients don't use the same key and effective key
610 * length. The key length is determined by the size of the
611 * decrypted RSA key.
612 */
613 if (EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen) <= 0) {
614 /* Use random key as MMA defence */
615 OPENSSL_clear_free(ek, eklen);
616 ek = tkey;
617 eklen = tkeylen;
618 tkey = NULL;
619 }
620 }
621 /* Clear errors so we don't leak information useful in MMA */
622 ERR_clear_error();
623 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
624 goto err;
625
626 OPENSSL_clear_free(ek, eklen);
627 ek = NULL;
628 OPENSSL_clear_free(tkey, tkeylen);
629 tkey = NULL;
630
631 if (out == NULL)
632 out = etmp;
633 else
634 BIO_push(out, etmp);
635 etmp = NULL;
636 }
637 if (in_bio != NULL) {
638 bio = in_bio;
639 } else {
640 if (data_body->length > 0)
641 bio = BIO_new_mem_buf(data_body->data, data_body->length);
642 else {
643 bio = BIO_new(BIO_s_mem());
644 if (bio == NULL)
645 goto err;
646 BIO_set_mem_eof_return(bio, 0);
647 }
648 if (bio == NULL)
649 goto err;
650 }
651 BIO_push(out, bio);
652 bio = NULL;
653 EVP_CIPHER_free(evp_cipher);
654 return out;
655
656 err:
657 EVP_CIPHER_free(evp_cipher);
658 OPENSSL_clear_free(ek, eklen);
659 OPENSSL_clear_free(tkey, tkeylen);
660 BIO_free_all(out);
661 BIO_free_all(btmp);
662 BIO_free_all(etmp);
663 BIO_free_all(bio);
664 return NULL;
665}
666
667static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
668{
669 for (;;) {
670 bio = BIO_find_type(bio, BIO_TYPE_MD);
671 if (bio == NULL) {
672 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
673 return NULL;
674 }
675 BIO_get_md_ctx(bio, pmd);
676 if (*pmd == NULL) {
677 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
678 return NULL;
679 }
680 if (EVP_MD_CTX_get_type(*pmd) == nid)
681 return bio;
682 bio = BIO_next(bio);
683 }
684 return NULL;
685}
686
687static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
688{
689 unsigned char md_data[EVP_MAX_MD_SIZE];
690 unsigned int md_len;
691
692 /* Add signing time if not already present */
693 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
694 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
695 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
696 return 0;
697 }
698 }
699
700 /* Add digest */
701 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
702 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
703 return 0;
704 }
705 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
706 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
707 return 0;
708 }
709
710 /* Now sign the attributes */
711 if (!PKCS7_SIGNER_INFO_sign(si))
712 return 0;
713
714 return 1;
715}
716
717int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
718{
719 int ret = 0;
720 int i, j;
721 BIO *btmp;
722 PKCS7_SIGNER_INFO *si;
723 EVP_MD_CTX *mdc, *ctx_tmp;
724 STACK_OF(X509_ATTRIBUTE) *sk;
725 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
726 ASN1_OCTET_STRING *os = NULL;
727 const PKCS7_CTX *p7_ctx;
728
729 if (p7 == NULL) {
730 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
731 return 0;
732 }
733
734 p7_ctx = ossl_pkcs7_get0_ctx(p7);
735
736 if (p7->d.ptr == NULL) {
737 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
738 return 0;
739 }
740
741 ctx_tmp = EVP_MD_CTX_new();
742 if (ctx_tmp == NULL) {
743 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
744 return 0;
745 }
746
747 i = OBJ_obj2nid(p7->type);
748 p7->state = PKCS7_S_HEADER;
749
750 switch (i) {
751 case NID_pkcs7_data:
752 os = p7->d.data;
753 break;
754 case NID_pkcs7_signedAndEnveloped:
755 /* XXXXXXXXXXXXXXXX */
756 si_sk = p7->d.signed_and_enveloped->signer_info;
757 os = p7->d.signed_and_enveloped->enc_data->enc_data;
758 if (os == NULL) {
759 os = ASN1_OCTET_STRING_new();
760 if (os == NULL) {
761 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
762 goto err;
763 }
764 p7->d.signed_and_enveloped->enc_data->enc_data = os;
765 }
766 break;
767 case NID_pkcs7_enveloped:
768 /* XXXXXXXXXXXXXXXX */
769 os = p7->d.enveloped->enc_data->enc_data;
770 if (os == NULL) {
771 os = ASN1_OCTET_STRING_new();
772 if (os == NULL) {
773 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
774 goto err;
775 }
776 p7->d.enveloped->enc_data->enc_data = os;
777 }
778 break;
779 case NID_pkcs7_signed:
780 si_sk = p7->d.sign->signer_info;
781 os = PKCS7_get_octet_string(p7->d.sign->contents);
782 /* If detached data then the content is excluded */
783 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
784 ASN1_OCTET_STRING_free(os);
785 os = NULL;
786 p7->d.sign->contents->d.data = NULL;
787 }
788 break;
789
790 case NID_pkcs7_digest:
791 os = PKCS7_get_octet_string(p7->d.digest->contents);
792 /* If detached data then the content is excluded */
793 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
794 ASN1_OCTET_STRING_free(os);
795 os = NULL;
796 p7->d.digest->contents->d.data = NULL;
797 }
798 break;
799
800 default:
801 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
802 goto err;
803 }
804
805 if (si_sk != NULL) {
806 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
807 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
808 if (si->pkey == NULL)
809 continue;
810
811 j = OBJ_obj2nid(si->digest_alg->algorithm);
812
813 btmp = bio;
814
815 btmp = PKCS7_find_digest(&mdc, btmp, j);
816
817 if (btmp == NULL)
818 goto err;
819
820 /*
821 * We now have the EVP_MD_CTX, lets do the signing.
822 */
823 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
824 goto err;
825
826 sk = si->auth_attr;
827
828 /*
829 * If there are attributes, we add the digest attribute and only
830 * sign the attributes
831 */
832 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
833 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
834 goto err;
835 } else {
836 unsigned char *abuf = NULL;
837 unsigned int abuflen = EVP_PKEY_get_size(si->pkey);
838
839 if (abuflen == 0 || (abuf = OPENSSL_malloc(abuflen)) == NULL)
840 goto err;
841
842 if (!EVP_SignFinal_ex(ctx_tmp, abuf, &abuflen, si->pkey,
843 ossl_pkcs7_ctx_get0_libctx(p7_ctx),
844 ossl_pkcs7_ctx_get0_propq(p7_ctx))) {
845 OPENSSL_free(abuf);
846 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
847 goto err;
848 }
849 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
850 }
851 }
852 } else if (i == NID_pkcs7_digest) {
853 unsigned char md_data[EVP_MAX_MD_SIZE];
854 unsigned int md_len;
855 if (!PKCS7_find_digest(&mdc, bio,
856 OBJ_obj2nid(p7->d.digest->md->algorithm)))
857 goto err;
858 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
859 goto err;
860 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
861 goto err;
862 }
863
864 if (!PKCS7_is_detached(p7)) {
865 /*
866 * NOTE(emilia): I think we only reach os == NULL here because detached
867 * digested data support is broken.
868 */
869 if (os == NULL)
870 goto err;
871 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
872 char *cont;
873 long contlen;
874 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
875 if (btmp == NULL) {
876 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
877 goto err;
878 }
879 contlen = BIO_get_mem_data(btmp, &cont);
880 /*
881 * Mark the BIO read only then we can use its copy of the data
882 * instead of making an extra copy.
883 */
884 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
885 BIO_set_mem_eof_return(btmp, 0);
886 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
887 }
888 }
889 ret = 1;
890 err:
891 EVP_MD_CTX_free(ctx_tmp);
892 return ret;
893}
894
895int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
896{
897 EVP_MD_CTX *mctx;
898 EVP_PKEY_CTX *pctx = NULL;
899 unsigned char *abuf = NULL;
900 int alen;
901 size_t siglen;
902 const EVP_MD *md = NULL;
903 const PKCS7_CTX *ctx = si->ctx;
904
905 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
906 if (md == NULL)
907 return 0;
908
909 mctx = EVP_MD_CTX_new();
910 if (mctx == NULL) {
911 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
912 goto err;
913 }
914
915 if (EVP_DigestSignInit_ex(mctx, &pctx, EVP_MD_get0_name(md),
916 ossl_pkcs7_ctx_get0_libctx(ctx),
917 ossl_pkcs7_ctx_get0_propq(ctx), si->pkey,
918 NULL) <= 0)
919 goto err;
920
921 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
922 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
923 if (!abuf)
924 goto err;
925 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
926 goto err;
927 OPENSSL_free(abuf);
928 abuf = NULL;
929 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
930 goto err;
931 abuf = OPENSSL_malloc(siglen);
932 if (abuf == NULL)
933 goto err;
934 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
935 goto err;
936
937 EVP_MD_CTX_free(mctx);
938
939 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
940
941 return 1;
942
943 err:
944 OPENSSL_free(abuf);
945 EVP_MD_CTX_free(mctx);
946 return 0;
947}
948
949/* This partly overlaps with PKCS7_verify(). It does not support flags. */
950int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
951 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
952{
953 PKCS7_ISSUER_AND_SERIAL *ias;
954 int ret = 0, i;
955 STACK_OF(X509) *untrusted;
956 STACK_OF(X509_CRL) *crls;
957 X509 *signer;
958
959 if (p7 == NULL) {
960 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
961 return 0;
962 }
963
964 if (p7->d.ptr == NULL) {
965 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
966 return 0;
967 }
968
969 if (PKCS7_type_is_signed(p7)) {
970 untrusted = p7->d.sign->cert;
971 crls = p7->d.sign->crl;
972 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
973 untrusted = p7->d.signed_and_enveloped->cert;
974 crls = p7->d.signed_and_enveloped->crl;
975 } else {
976 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
977 goto err;
978 }
979 X509_STORE_CTX_set0_crls(ctx, crls);
980
981 /* XXXXXXXXXXXXXXXXXXXXXXX */
982 ias = si->issuer_and_serial;
983
984 signer = X509_find_by_issuer_and_serial(untrusted, ias->issuer, ias->serial);
985
986 /* Were we able to find the signer certificate in passed to us? */
987 if (signer == NULL) {
988 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
989 goto err;
990 }
991
992 /* Lets verify */
993 if (!X509_STORE_CTX_init(ctx, cert_store, signer, untrusted)) {
994 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
995 goto err;
996 }
997 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
998 i = X509_verify_cert(ctx);
999 if (i <= 0) {
1000 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
1001 goto err;
1002 }
1003
1004 return PKCS7_signatureVerify(bio, p7, si, signer);
1005 err:
1006 return ret;
1007}
1008
1009int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1010 X509 *signer)
1011{
1012 ASN1_OCTET_STRING *os;
1013 EVP_MD_CTX *mdc_tmp, *mdc;
1014 const EVP_MD *md;
1015 EVP_MD *fetched_md = NULL;
1016 int ret = 0, i;
1017 int md_type;
1018 STACK_OF(X509_ATTRIBUTE) *sk;
1019 BIO *btmp;
1020 EVP_PKEY *pkey;
1021 const PKCS7_CTX *ctx = ossl_pkcs7_get0_ctx(p7);
1022 OSSL_LIB_CTX *libctx = ossl_pkcs7_ctx_get0_libctx(ctx);
1023 const char *propq = ossl_pkcs7_ctx_get0_propq(ctx);
1024
1025 mdc_tmp = EVP_MD_CTX_new();
1026 if (mdc_tmp == NULL) {
1027 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
1028 goto err;
1029 }
1030
1031 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1032 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
1033 goto err;
1034 }
1035
1036 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1037
1038 btmp = bio;
1039 for (;;) {
1040 if ((btmp == NULL) ||
1041 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1042 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1043 goto err;
1044 }
1045 BIO_get_md_ctx(btmp, &mdc);
1046 if (mdc == NULL) {
1047 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
1048 goto err;
1049 }
1050 if (EVP_MD_CTX_get_type(mdc) == md_type)
1051 break;
1052 /*
1053 * Workaround for some broken clients that put the signature OID
1054 * instead of the digest OID in digest_alg->algorithm
1055 */
1056 if (EVP_MD_get_pkey_type(EVP_MD_CTX_get0_md(mdc)) == md_type)
1057 break;
1058 btmp = BIO_next(btmp);
1059 }
1060
1061 /*
1062 * mdc is the digest ctx that we want, unless there are attributes, in
1063 * which case the digest is the signed attributes
1064 */
1065 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1066 goto err;
1067
1068 sk = si->auth_attr;
1069 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1070 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1071 unsigned int md_len;
1072 int alen;
1073 ASN1_OCTET_STRING *message_digest;
1074
1075 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1076 goto err;
1077 message_digest = PKCS7_digest_from_attributes(sk);
1078 if (!message_digest) {
1079 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1080 goto err;
1081 }
1082 if ((message_digest->length != (int)md_len) ||
1083 (memcmp(message_digest->data, md_dat, md_len))) {
1084 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DIGEST_FAILURE);
1085 ret = -1;
1086 goto err;
1087 }
1088
1089 (void)ERR_set_mark();
1090 fetched_md = EVP_MD_fetch(libctx, OBJ_nid2sn(md_type), propq);
1091
1092 if (fetched_md != NULL)
1093 md = fetched_md;
1094 else
1095 md = EVP_get_digestbynid(md_type);
1096
1097 if (md == NULL || !EVP_VerifyInit_ex(mdc_tmp, md, NULL)) {
1098 (void)ERR_clear_last_mark();
1099 goto err;
1100 }
1101 (void)ERR_pop_to_mark();
1102
1103 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1104 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1105 if (alen <= 0) {
1106 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
1107 ret = -1;
1108 goto err;
1109 }
1110 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1111 goto err;
1112
1113 OPENSSL_free(abuf);
1114 }
1115
1116 os = si->enc_digest;
1117 pkey = X509_get0_pubkey(signer);
1118 if (pkey == NULL) {
1119 ret = -1;
1120 goto err;
1121 }
1122
1123 i = EVP_VerifyFinal_ex(mdc_tmp, os->data, os->length, pkey, libctx, propq);
1124 if (i <= 0) {
1125 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
1126 ret = -1;
1127 goto err;
1128 }
1129 ret = 1;
1130 err:
1131 EVP_MD_CTX_free(mdc_tmp);
1132 EVP_MD_free(fetched_md);
1133 return ret;
1134}
1135
1136PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1137{
1138 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1139 PKCS7_RECIP_INFO *ri;
1140 int i;
1141
1142 i = OBJ_obj2nid(p7->type);
1143 if (i != NID_pkcs7_signedAndEnveloped)
1144 return NULL;
1145 if (p7->d.signed_and_enveloped == NULL)
1146 return NULL;
1147 rsk = p7->d.signed_and_enveloped->recipientinfo;
1148 if (rsk == NULL)
1149 return NULL;
1150 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1151 return NULL;
1152 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1153 return ri->issuer_and_serial;
1154}
1155
1156ASN1_TYPE *PKCS7_get_signed_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1157{
1158 return get_attribute(si->auth_attr, nid);
1159}
1160
1161ASN1_TYPE *PKCS7_get_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1162{
1163 return get_attribute(si->unauth_attr, nid);
1164}
1165
1166static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1167{
1168 int idx = X509at_get_attr_by_NID(sk, nid, -1);
1169
1170 if (idx < 0)
1171 return NULL;
1172 return X509_ATTRIBUTE_get0_type(X509at_get_attr(sk, idx), 0);
1173}
1174
1175ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1176{
1177 ASN1_TYPE *astype;
1178 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1179 return NULL;
1180 return astype->value.octet_string;
1181}
1182
1183int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1184 STACK_OF(X509_ATTRIBUTE) *sk)
1185{
1186 int i;
1187
1188 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1189 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1190 if (p7si->auth_attr == NULL)
1191 return 0;
1192 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1193 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1194 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1195 (sk, i))))
1196 == NULL)
1197 return 0;
1198 }
1199 return 1;
1200}
1201
1202int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1203 STACK_OF(X509_ATTRIBUTE) *sk)
1204{
1205 int i;
1206
1207 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1208 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1209 if (p7si->unauth_attr == NULL)
1210 return 0;
1211 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1212 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1213 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1214 (sk, i))))
1215 == NULL)
1216 return 0;
1217 }
1218 return 1;
1219}
1220
1221int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1222 void *value)
1223{
1224 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1225}
1226
1227int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1228 void *value)
1229{
1230 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1231}
1232
1233static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1234 void *value)
1235{
1236 X509_ATTRIBUTE *attr = NULL;
1237 int i, n;
1238
1239 if (*sk == NULL) {
1240 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1241 return 0;
1242 }
1243 n = sk_X509_ATTRIBUTE_num(*sk);
1244 for (i = 0; i < n; i++) {
1245 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1246 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid)
1247 goto end;
1248 }
1249 if (!sk_X509_ATTRIBUTE_push(*sk, NULL))
1250 return 0;
1251
1252 end:
1253 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1254 if (attr == NULL) {
1255 if (i == n)
1256 sk_X509_ATTRIBUTE_pop(*sk);
1257 return 0;
1258 }
1259 X509_ATTRIBUTE_free(sk_X509_ATTRIBUTE_value(*sk, i));
1260 (void) sk_X509_ATTRIBUTE_set(*sk, i, attr);
1261 return 1;
1262}
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