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Correct PPTP server firewall rules chain.
[tomato/davidwu.git] / release / src / router / openssl / crypto / pkcs7 / pk7_doit.c
blobd91aa116a993f1d42ca9dfb2d36f3e3e8a3397b5
1 /* crypto/pkcs7/pk7_doit.c */
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 "cryptlib.h"
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.h>
65 #include <openssl/err.h>
66
67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
68 void *value);
69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
70
71 static int PKCS7_type_is_other(PKCS7* p7)
72 {
73 int isOther=1;
74
75 int nid=OBJ_obj2nid(p7->type);
76
77 switch( nid )
78 {
79 case NID_pkcs7_data:
80 case NID_pkcs7_signed:
81 case NID_pkcs7_enveloped:
82 case NID_pkcs7_signedAndEnveloped:
83 case NID_pkcs7_digest:
84 case NID_pkcs7_encrypted:
85 isOther=0;
86 break;
87 default:
88 isOther=1;
89 }
90
91 return isOther;
92
93 }
94
95 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
96 {
97 if ( PKCS7_type_is_data(p7))
98 return p7->d.data;
99 if ( PKCS7_type_is_other(p7) && p7->d.other
100 && (p7->d.other->type == V_ASN1_OCTET_STRING))
101 return p7->d.other->value.octet_string;
102 return NULL;
103 }
104
105 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
106 {
107 BIO *btmp;
108 const EVP_MD *md;
109 if ((btmp=BIO_new(BIO_f_md())) == NULL)
110 {
111 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
112 goto err;
113 }
114
115 md=EVP_get_digestbyobj(alg->algorithm);
116 if (md == NULL)
117 {
118 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,PKCS7_R_UNKNOWN_DIGEST_TYPE);
119 goto err;
120 }
121
122 BIO_set_md(btmp,md);
123 if (*pbio == NULL)
124 *pbio=btmp;
125 else if (!BIO_push(*pbio,btmp))
126 {
127 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST,ERR_R_BIO_LIB);
128 goto err;
129 }
130 btmp=NULL;
131
132 return 1;
133
134 err:
135 if (btmp)
136 BIO_free(btmp);
137 return 0;
138
139 }
140
141 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
142 unsigned char *key, int keylen)
143 {
144 EVP_PKEY_CTX *pctx = NULL;
145 EVP_PKEY *pkey = NULL;
146 unsigned char *ek = NULL;
147 int ret = 0;
148 size_t eklen;
149
150 pkey = X509_get_pubkey(ri->cert);
151
152 if (!pkey)
153 return 0;
154
155 pctx = EVP_PKEY_CTX_new(pkey, NULL);
156 if (!pctx)
157 return 0;
158
159 if (EVP_PKEY_encrypt_init(pctx) <= 0)
160 goto err;
161
162 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
163 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0)
164 {
165 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
166 goto err;
167 }
168
169 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
170 goto err;
171
172 ek = OPENSSL_malloc(eklen);
173
174 if (ek == NULL)
175 {
176 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
177 goto err;
178 }
179
180 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
181 goto err;
182
183 ASN1_STRING_set0(ri->enc_key, ek, eklen);
184 ek = NULL;
185
186 ret = 1;
187
188 err:
189 if (pkey)
190 EVP_PKEY_free(pkey);
191 if (pctx)
192 EVP_PKEY_CTX_free(pctx);
193 if (ek)
194 OPENSSL_free(ek);
195 return ret;
196
197 }
198
199
200 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
201 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
202 {
203 EVP_PKEY_CTX *pctx = NULL;
204 unsigned char *ek = NULL;
205 size_t eklen;
206
207 int ret = -1;
208
209 pctx = EVP_PKEY_CTX_new(pkey, NULL);
210 if (!pctx)
211 return -1;
212
213 if (EVP_PKEY_decrypt_init(pctx) <= 0)
214 goto err;
215
216 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
217 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0)
218 {
219 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
220 goto err;
221 }
222
223 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
224 ri->enc_key->data, ri->enc_key->length) <= 0)
225 goto err;
226
227 ek = OPENSSL_malloc(eklen);
228
229 if (ek == NULL)
230 {
231 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
232 goto err;
233 }
234
235 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
236 ri->enc_key->data, ri->enc_key->length) <= 0)
237 {
238 ret = 0;
239 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
240 goto err;
241 }
242
243 ret = 1;
244
245 if (*pek)
246 {
247 OPENSSL_cleanse(*pek, *peklen);
248 OPENSSL_free(*pek);
249 }
250
251 *pek = ek;
252 *peklen = eklen;
253
254 err:
255 if (pctx)
256 EVP_PKEY_CTX_free(pctx);
257 if (!ret && ek)
258 OPENSSL_free(ek);
259
260 return ret;
261 }
262
263 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
264 {
265 int i;
266 BIO *out=NULL,*btmp=NULL;
267 X509_ALGOR *xa = NULL;
268 const EVP_CIPHER *evp_cipher=NULL;
269 STACK_OF(X509_ALGOR) *md_sk=NULL;
270 STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
271 X509_ALGOR *xalg=NULL;
272 PKCS7_RECIP_INFO *ri=NULL;
273 ASN1_OCTET_STRING *os=NULL;
274
275 i=OBJ_obj2nid(p7->type);
276 p7->state=PKCS7_S_HEADER;
277
278 switch (i)
279 {
280 case NID_pkcs7_signed:
281 md_sk=p7->d.sign->md_algs;
282 os = PKCS7_get_octet_string(p7->d.sign->contents);
283 break;
284 case NID_pkcs7_signedAndEnveloped:
285 rsk=p7->d.signed_and_enveloped->recipientinfo;
286 md_sk=p7->d.signed_and_enveloped->md_algs;
287 xalg=p7->d.signed_and_enveloped->enc_data->algorithm;
288 evp_cipher=p7->d.signed_and_enveloped->enc_data->cipher;
289 if (evp_cipher == NULL)
290 {
291 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
292 PKCS7_R_CIPHER_NOT_INITIALIZED);
293 goto err;
294 }
295 break;
296 case NID_pkcs7_enveloped:
297 rsk=p7->d.enveloped->recipientinfo;
298 xalg=p7->d.enveloped->enc_data->algorithm;
299 evp_cipher=p7->d.enveloped->enc_data->cipher;
300 if (evp_cipher == NULL)
301 {
302 PKCS7err(PKCS7_F_PKCS7_DATAINIT,
303 PKCS7_R_CIPHER_NOT_INITIALIZED);
304 goto err;
305 }
306 break;
307 case NID_pkcs7_digest:
308 xa = p7->d.digest->md;
309 os = PKCS7_get_octet_string(p7->d.digest->contents);
310 break;
311 case NID_pkcs7_data:
312 break;
313 default:
314 PKCS7err(PKCS7_F_PKCS7_DATAINIT,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
315 goto err;
316 }
317
318 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
319 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
320 goto err;
321
322 if (xa && !PKCS7_bio_add_digest(&out, xa))
323 goto err;
324
325 if (evp_cipher != NULL)
326 {
327 unsigned char key[EVP_MAX_KEY_LENGTH];
328 unsigned char iv[EVP_MAX_IV_LENGTH];
329 int keylen,ivlen;
330 EVP_CIPHER_CTX *ctx;
331
332 if ((btmp=BIO_new(BIO_f_cipher())) == NULL)
333 {
334 PKCS7err(PKCS7_F_PKCS7_DATAINIT,ERR_R_BIO_LIB);
335 goto err;
336 }
337 BIO_get_cipher_ctx(btmp, &ctx);
338 keylen=EVP_CIPHER_key_length(evp_cipher);
339 ivlen=EVP_CIPHER_iv_length(evp_cipher);
340 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
341 if (ivlen > 0)
342 if (RAND_pseudo_bytes(iv,ivlen) <= 0)
343 goto err;
344 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1)<=0)
345 goto err;
346 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
347 goto err;
348 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
349 goto err;
350
351 if (ivlen > 0) {
352 if (xalg->parameter == NULL) {
353 xalg->parameter = ASN1_TYPE_new();
354 if (xalg->parameter == NULL)
355 goto err;
356 }
357 if(EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
358 goto err;
359 }
360
361 /* Lets do the pub key stuff :-) */
362 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
363 {
364 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
365 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
366 goto err;
367 }
368 OPENSSL_cleanse(key, keylen);
369
370 if (out == NULL)
371 out=btmp;
372 else
373 BIO_push(out,btmp);
374 btmp=NULL;
375 }
376
377 if (bio == NULL)
378 {
379 if (PKCS7_is_detached(p7))
380 bio=BIO_new(BIO_s_null());
381 else if (os && os->length > 0)
382 bio = BIO_new_mem_buf(os->data, os->length);
383 if(bio == NULL)
384 {
385 bio=BIO_new(BIO_s_mem());
386 if (bio == NULL)
387 goto err;
388 BIO_set_mem_eof_return(bio,0);
389 }
390 }
391 if (out)
392 BIO_push(out,bio);
393 else
394 out = bio;
395 bio=NULL;
396 if (0)
397 {
398 err:
399 if (out != NULL)
400 BIO_free_all(out);
401 if (btmp != NULL)
402 BIO_free_all(btmp);
403 out=NULL;
404 }
405 return(out);
406 }
407
408 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
409 {
410 int ret;
411 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
412 pcert->cert_info->issuer);
413 if (ret)
414 return ret;
415 return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
416 ri->issuer_and_serial->serial);
417 }
418
419 /* int */
420 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
421 {
422 int i,j;
423 BIO *out=NULL,*btmp=NULL,*etmp=NULL,*bio=NULL;
424 X509_ALGOR *xa;
425 ASN1_OCTET_STRING *data_body=NULL;
426 const EVP_MD *evp_md;
427 const EVP_CIPHER *evp_cipher=NULL;
428 EVP_CIPHER_CTX *evp_ctx=NULL;
429 X509_ALGOR *enc_alg=NULL;
430 STACK_OF(X509_ALGOR) *md_sk=NULL;
431 STACK_OF(PKCS7_RECIP_INFO) *rsk=NULL;
432 PKCS7_RECIP_INFO *ri=NULL;
433 unsigned char *ek = NULL, *tkey = NULL;
434 int eklen = 0, tkeylen = 0;
435
436 i=OBJ_obj2nid(p7->type);
437 p7->state=PKCS7_S_HEADER;
438
439 switch (i)
440 {
441 case NID_pkcs7_signed:
442 data_body=PKCS7_get_octet_string(p7->d.sign->contents);
443 if (!PKCS7_is_detached(p7) && data_body == NULL)
444 {
445 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_INVALID_SIGNED_DATA_TYPE);
446 goto err;
447 }
448 md_sk=p7->d.sign->md_algs;
449 break;
450 case NID_pkcs7_signedAndEnveloped:
451 rsk=p7->d.signed_and_enveloped->recipientinfo;
452 md_sk=p7->d.signed_and_enveloped->md_algs;
453 data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
454 enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
455 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
456 if (evp_cipher == NULL)
457 {
458 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
459 goto err;
460 }
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=p7->d.enveloped->enc_data->enc_data;
466 evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
467 if (evp_cipher == NULL)
468 {
469 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
470 goto err;
471 }
472 break;
473 default:
474 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
475 goto err;
476 }
477
478 /* We will be checking the signature */
479 if (md_sk != NULL)
480 {
481 for (i=0; i<sk_X509_ALGOR_num(md_sk); i++)
482 {
483 xa=sk_X509_ALGOR_value(md_sk,i);
484 if ((btmp=BIO_new(BIO_f_md())) == NULL)
485 {
486 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
487 goto err;
488 }
489
490 j=OBJ_obj2nid(xa->algorithm);
491 evp_md=EVP_get_digestbynid(j);
492 if (evp_md == NULL)
493 {
494 PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_UNKNOWN_DIGEST_TYPE);
495 goto err;
496 }
497
498 BIO_set_md(btmp,evp_md);
499 if (out == NULL)
500 out=btmp;
501 else
502 BIO_push(out,btmp);
503 btmp=NULL;
504 }
505 }
506
507 if (evp_cipher != NULL)
508 {
509 #if 0
510 unsigned char key[EVP_MAX_KEY_LENGTH];
511 unsigned char iv[EVP_MAX_IV_LENGTH];
512 unsigned char *p;
513 int keylen,ivlen;
514 int max;
515 X509_OBJECT ret;
516 #endif
517
518 if ((etmp=BIO_new(BIO_f_cipher())) == NULL)
519 {
520 PKCS7err(PKCS7_F_PKCS7_DATADECODE,ERR_R_BIO_LIB);
521 goto err;
522 }
523
524 /* It was encrypted, we need to decrypt the secret key
525 * with the private key */
526
527 /* Find the recipientInfo which matches the passed certificate
528 * (if any)
529 */
530
531 if (pcert)
532 {
533 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
534 {
535 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
536 if (!pkcs7_cmp_ri(ri, pcert))
537 break;
538 ri=NULL;
539 }
540 if (ri == NULL)
541 {
542 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
543 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
544 goto err;
545 }
546 }
547
548 /* If we haven't got a certificate try each ri in turn */
549 if (pcert == NULL)
550 {
551 /* Always attempt to decrypt all rinfo even
552 * after sucess as a defence against MMA timing
553 * attacks.
554 */
555 for (i=0; i<sk_PKCS7_RECIP_INFO_num(rsk); i++)
556 {
557 ri=sk_PKCS7_RECIP_INFO_value(rsk,i);
558
559 if (pkcs7_decrypt_rinfo(&ek, &eklen,
560 ri, pkey) < 0)
561 goto err;
562 ERR_clear_error();
563 }
564 }
565 else
566 {
567 /* Only exit on fatal errors, not decrypt failure */
568 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
569 goto err;
570 ERR_clear_error();
571 }
572
573 evp_ctx=NULL;
574 BIO_get_cipher_ctx(etmp,&evp_ctx);
575 if (EVP_CipherInit_ex(evp_ctx,evp_cipher,NULL,NULL,NULL,0) <= 0)
576 goto err;
577 if (EVP_CIPHER_asn1_to_param(evp_ctx,enc_alg->parameter) < 0)
578 goto err;
579 /* Generate random key as MMA defence */
580 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
581 tkey = OPENSSL_malloc(tkeylen);
582 if (!tkey)
583 goto err;
584 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
585 goto err;
586 if (ek == NULL)
587 {
588 ek = tkey;
589 eklen = tkeylen;
590 tkey = NULL;
591 }
592
593 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
594 /* Some S/MIME clients don't use the same key
595 * and effective key length. The key length is
596 * determined by the size of the decrypted RSA key.
597 */
598 if(!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen))
599 {
600 /* Use random key as MMA defence */
601 OPENSSL_cleanse(ek, eklen);
602 OPENSSL_free(ek);
603 ek = tkey;
604 eklen = tkeylen;
605 tkey = NULL;
606 }
607 }
608 /* Clear errors so we don't leak information useful in MMA */
609 ERR_clear_error();
610 if (EVP_CipherInit_ex(evp_ctx,NULL,NULL,ek,NULL,0) <= 0)
611 goto err;
612
613 if (ek)
614 {
615 OPENSSL_cleanse(ek,eklen);
616 OPENSSL_free(ek);
617 ek = NULL;
618 }
619 if (tkey)
620 {
621 OPENSSL_cleanse(tkey,tkeylen);
622 OPENSSL_free(tkey);
623 tkey = NULL;
624 }
625
626 if (out == NULL)
627 out=etmp;
628 else
629 BIO_push(out,etmp);
630 etmp=NULL;
631 }
632
633 #if 1
634 if (PKCS7_is_detached(p7) || (in_bio != NULL))
635 {
636 bio=in_bio;
637 }
638 else
639 {
640 #if 0
641 bio=BIO_new(BIO_s_mem());
642 /* We need to set this so that when we have read all
643 * the data, the encrypt BIO, if present, will read
644 * EOF and encode the last few bytes */
645 BIO_set_mem_eof_return(bio,0);
646
647 if (data_body->length > 0)
648 BIO_write(bio,(char *)data_body->data,data_body->length);
649 #else
650 if (data_body->length > 0)
651 bio = BIO_new_mem_buf(data_body->data,data_body->length);
652 else {
653 bio=BIO_new(BIO_s_mem());
654 BIO_set_mem_eof_return(bio,0);
655 }
656 if (bio == NULL)
657 goto err;
658 #endif
659 }
660 BIO_push(out,bio);
661 bio=NULL;
662 #endif
663 if (0)
664 {
665 err:
666 if (ek)
667 {
668 OPENSSL_cleanse(ek,eklen);
669 OPENSSL_free(ek);
670 }
671 if (tkey)
672 {
673 OPENSSL_cleanse(tkey,tkeylen);
674 OPENSSL_free(tkey);
675 }
676 if (out != NULL) BIO_free_all(out);
677 if (btmp != NULL) BIO_free_all(btmp);
678 if (etmp != NULL) BIO_free_all(etmp);
679 if (bio != NULL) BIO_free_all(bio);
680 out=NULL;
681 }
682 return(out);
683 }
684
685 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
686 {
687 for (;;)
688 {
689 bio=BIO_find_type(bio,BIO_TYPE_MD);
690 if (bio == NULL)
691 {
692 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
693 return NULL;
694 }
695 BIO_get_md_ctx(bio,pmd);
696 if (*pmd == NULL)
697 {
698 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,ERR_R_INTERNAL_ERROR);
699 return NULL;
700 }
701 if (EVP_MD_CTX_type(*pmd) == nid)
702 return bio;
703 bio=BIO_next(bio);
704 }
705 return NULL;
706 }
707
708 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
709 {
710 unsigned char md_data[EVP_MAX_MD_SIZE];
711 unsigned int md_len;
712
713 /* Add signing time if not already present */
714 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime))
715 {
716 if (!PKCS7_add0_attrib_signing_time(si, NULL))
717 {
718 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB,
719 ERR_R_MALLOC_FAILURE);
720 return 0;
721 }
722 }
723
724 /* Add digest */
725 if (!EVP_DigestFinal_ex(mctx, md_data,&md_len))
726 {
727 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
728 return 0;
729 }
730 if (!PKCS7_add1_attrib_digest(si, md_data, md_len))
731 {
732 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
733 return 0;
734 }
735
736 /* Now sign the attributes */
737 if (!PKCS7_SIGNER_INFO_sign(si))
738 return 0;
739
740 return 1;
741 }
742
743
744 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
745 {
746 int ret=0;
747 int i,j;
748 BIO *btmp;
749 PKCS7_SIGNER_INFO *si;
750 EVP_MD_CTX *mdc,ctx_tmp;
751 STACK_OF(X509_ATTRIBUTE) *sk;
752 STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
753 ASN1_OCTET_STRING *os=NULL;
754
755 EVP_MD_CTX_init(&ctx_tmp);
756 i=OBJ_obj2nid(p7->type);
757 p7->state=PKCS7_S_HEADER;
758
759 switch (i)
760 {
761 case NID_pkcs7_data:
762 os = p7->d.data;
763 break;
764 case NID_pkcs7_signedAndEnveloped:
765 /* XXXXXXXXXXXXXXXX */
766 si_sk=p7->d.signed_and_enveloped->signer_info;
767 os = p7->d.signed_and_enveloped->enc_data->enc_data;
768 if (!os)
769 {
770 os=M_ASN1_OCTET_STRING_new();
771 if (!os)
772 {
773 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
774 goto err;
775 }
776 p7->d.signed_and_enveloped->enc_data->enc_data=os;
777 }
778 break;
779 case NID_pkcs7_enveloped:
780 /* XXXXXXXXXXXXXXXX */
781 os = p7->d.enveloped->enc_data->enc_data;
782 if (!os)
783 {
784 os=M_ASN1_OCTET_STRING_new();
785 if (!os)
786 {
787 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,ERR_R_MALLOC_FAILURE);
788 goto err;
789 }
790 p7->d.enveloped->enc_data->enc_data=os;
791 }
792 break;
793 case NID_pkcs7_signed:
794 si_sk=p7->d.sign->signer_info;
795 os=PKCS7_get_octet_string(p7->d.sign->contents);
796 /* If detached data then the content is excluded */
797 if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
798 M_ASN1_OCTET_STRING_free(os);
799 p7->d.sign->contents->d.data = NULL;
800 }
801 break;
802
803 case NID_pkcs7_digest:
804 os=PKCS7_get_octet_string(p7->d.digest->contents);
805 /* If detached data then the content is excluded */
806 if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
807 {
808 M_ASN1_OCTET_STRING_free(os);
809 p7->d.digest->contents->d.data = NULL;
810 }
811 break;
812
813 default:
814 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
815 goto err;
816 }
817
818 if (si_sk != NULL)
819 {
820 for (i=0; i<sk_PKCS7_SIGNER_INFO_num(si_sk); i++)
821 {
822 si=sk_PKCS7_SIGNER_INFO_value(si_sk,i);
823 if (si->pkey == NULL)
824 continue;
825
826 j = OBJ_obj2nid(si->digest_alg->algorithm);
827
828 btmp=bio;
829
830 btmp = PKCS7_find_digest(&mdc, btmp, j);
831
832 if (btmp == NULL)
833 goto err;
834
835 /* We now have the EVP_MD_CTX, lets do the
836 * signing. */
837 if (!EVP_MD_CTX_copy_ex(&ctx_tmp,mdc))
838 goto err;
839
840 sk=si->auth_attr;
841
842 /* If there are attributes, we add the digest
843 * attribute and only sign the attributes */
844 if (sk_X509_ATTRIBUTE_num(sk) > 0)
845 {
846 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
847 goto err;
848 }
849 else
850 {
851 unsigned char *abuf = NULL;
852 unsigned int abuflen;
853 abuflen = EVP_PKEY_size(si->pkey);
854 abuf = OPENSSL_malloc(abuflen);
855 if (!abuf)
856 goto err;
857
858 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen,
859 si->pkey))
860 {
861 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,
862 ERR_R_EVP_LIB);
863 goto err;
864 }
865 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
866 }
867 }
868 }
869 else if (i == NID_pkcs7_digest)
870 {
871 unsigned char md_data[EVP_MAX_MD_SIZE];
872 unsigned int md_len;
873 if (!PKCS7_find_digest(&mdc, bio,
874 OBJ_obj2nid(p7->d.digest->md->algorithm)))
875 goto err;
876 if (!EVP_DigestFinal_ex(mdc,md_data,&md_len))
877 goto err;
878 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
879 }
880
881 if (!PKCS7_is_detached(p7) && !(os->flags & ASN1_STRING_FLAG_NDEF))
882 {
883 char *cont;
884 long contlen;
885 btmp=BIO_find_type(bio,BIO_TYPE_MEM);
886 if (btmp == NULL)
887 {
888 PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
889 goto err;
890 }
891 contlen = BIO_get_mem_data(btmp, &cont);
892 /* Mark the BIO read only then we can use its copy of the data
893 * instead of making an extra copy.
894 */
895 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
896 BIO_set_mem_eof_return(btmp, 0);
897 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
898 }
899 ret=1;
900 err:
901 EVP_MD_CTX_cleanup(&ctx_tmp);
902 return(ret);
903 }
904
905 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
906 {
907 EVP_MD_CTX mctx;
908 EVP_PKEY_CTX *pctx;
909 unsigned char *abuf = NULL;
910 int alen;
911 size_t siglen;
912 const EVP_MD *md = NULL;
913
914 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
915 if (md == NULL)
916 return 0;
917
918 EVP_MD_CTX_init(&mctx);
919 if (EVP_DigestSignInit(&mctx, &pctx, md,NULL, si->pkey) <= 0)
920 goto err;
921
922 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
923 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0)
924 {
925 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
926 goto err;
927 }
928
929 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr,&abuf,
930 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
931 if(!abuf)
932 goto err;
933 if (EVP_DigestSignUpdate(&mctx,abuf,alen) <= 0)
934 goto err;
935 OPENSSL_free(abuf);
936 abuf = NULL;
937 if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
938 goto err;
939 abuf = OPENSSL_malloc(siglen);
940 if(!abuf)
941 goto err;
942 if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
943 goto err;
944
945 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
946 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0)
947 {
948 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
949 goto err;
950 }
951
952 EVP_MD_CTX_cleanup(&mctx);
953
954 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
955
956 return 1;
957
958 err:
959 if (abuf)
960 OPENSSL_free(abuf);
961 EVP_MD_CTX_cleanup(&mctx);
962 return 0;
963
964 }
965
966 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
967 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
968 {
969 PKCS7_ISSUER_AND_SERIAL *ias;
970 int ret=0,i;
971 STACK_OF(X509) *cert;
972 X509 *x509;
973
974 if (PKCS7_type_is_signed(p7))
975 {
976 cert=p7->d.sign->cert;
977 }
978 else if (PKCS7_type_is_signedAndEnveloped(p7))
979 {
980 cert=p7->d.signed_and_enveloped->cert;
981 }
982 else
983 {
984 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_WRONG_PKCS7_TYPE);
985 goto err;
986 }
987 /* XXXXXXXXXXXXXXXXXXXXXXX */
988 ias=si->issuer_and_serial;
989
990 x509=X509_find_by_issuer_and_serial(cert,ias->issuer,ias->serial);
991
992 /* were we able to find the cert in passed to us */
993 if (x509 == NULL)
994 {
995 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
996 goto err;
997 }
998
999 /* Lets verify */
1000 if(!X509_STORE_CTX_init(ctx,cert_store,x509,cert))
1001 {
1002 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
1003 goto err;
1004 }
1005 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1006 i=X509_verify_cert(ctx);
1007 if (i <= 0)
1008 {
1009 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,ERR_R_X509_LIB);
1010 X509_STORE_CTX_cleanup(ctx);
1011 goto err;
1012 }
1013 X509_STORE_CTX_cleanup(ctx);
1014
1015 return PKCS7_signatureVerify(bio, p7, si, x509);
1016 err:
1017 return ret;
1018 }
1019
1020 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1021 X509 *x509)
1022 {
1023 ASN1_OCTET_STRING *os;
1024 EVP_MD_CTX mdc_tmp,*mdc;
1025 int ret=0,i;
1026 int md_type;
1027 STACK_OF(X509_ATTRIBUTE) *sk;
1028 BIO *btmp;
1029 EVP_PKEY *pkey;
1030
1031 EVP_MD_CTX_init(&mdc_tmp);
1032
1033 if (!PKCS7_type_is_signed(p7) &&
1034 !PKCS7_type_is_signedAndEnveloped(p7)) {
1035 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1036 PKCS7_R_WRONG_PKCS7_TYPE);
1037 goto err;
1038 }
1039
1040 md_type=OBJ_obj2nid(si->digest_alg->algorithm);
1041
1042 btmp=bio;
1043 for (;;)
1044 {
1045 if ((btmp == NULL) ||
1046 ((btmp=BIO_find_type(btmp,BIO_TYPE_MD)) == NULL))
1047 {
1048 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1049 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1050 goto err;
1051 }
1052 BIO_get_md_ctx(btmp,&mdc);
1053 if (mdc == NULL)
1054 {
1055 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1056 ERR_R_INTERNAL_ERROR);
1057 goto err;
1058 }
1059 if (EVP_MD_CTX_type(mdc) == md_type)
1060 break;
1061 /* Workaround for some broken clients that put the signature
1062 * OID instead of the digest OID in digest_alg->algorithm
1063 */
1064 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1065 break;
1066 btmp=BIO_next(btmp);
1067 }
1068
1069 /* mdc is the digest ctx that we want, unless there are attributes,
1070 * in which case the digest is the signed attributes */
1071 if (!EVP_MD_CTX_copy_ex(&mdc_tmp,mdc))
1072 goto err;
1073
1074 sk=si->auth_attr;
1075 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0))
1076 {
1077 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1078 unsigned int md_len;
1079 int alen;
1080 ASN1_OCTET_STRING *message_digest;
1081
1082 if (!EVP_DigestFinal_ex(&mdc_tmp,md_dat,&md_len))
1083 goto err;
1084 message_digest=PKCS7_digest_from_attributes(sk);
1085 if (!message_digest)
1086 {
1087 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1088 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1089 goto err;
1090 }
1091 if ((message_digest->length != (int)md_len) ||
1092 (memcmp(message_digest->data,md_dat,md_len)))
1093 {
1094 #if 0
1095 {
1096 int ii;
1097 for (ii=0; ii<message_digest->length; ii++)
1098 printf("%02X",message_digest->data[ii]); printf(" sent\n");
1099 for (ii=0; ii<md_len; ii++) printf("%02X",md_dat[ii]); printf(" calc\n");
1100 }
1101 #endif
1102 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1103 PKCS7_R_DIGEST_FAILURE);
1104 ret= -1;
1105 goto err;
1106 }
1107
1108 if (!EVP_VerifyInit_ex(&mdc_tmp,EVP_get_digestbynid(md_type), NULL))
1109 goto err;
1110
1111 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1112 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1113 if (alen <= 0)
1114 {
1115 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,ERR_R_ASN1_LIB);
1116 ret = -1;
1117 goto err;
1118 }
1119 if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1120 goto err;
1121
1122 OPENSSL_free(abuf);
1123 }
1124
1125 os=si->enc_digest;
1126 pkey = X509_get_pubkey(x509);
1127 if (!pkey)
1128 {
1129 ret = -1;
1130 goto err;
1131 }
1132
1133 i=EVP_VerifyFinal(&mdc_tmp,os->data,os->length, pkey);
1134 EVP_PKEY_free(pkey);
1135 if (i <= 0)
1136 {
1137 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1138 PKCS7_R_SIGNATURE_FAILURE);
1139 ret= -1;
1140 goto err;
1141 }
1142 else
1143 ret=1;
1144 err:
1145 EVP_MD_CTX_cleanup(&mdc_tmp);
1146 return(ret);
1147 }
1148
1149 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1150 {
1151 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1152 PKCS7_RECIP_INFO *ri;
1153 int i;
1154
1155 i=OBJ_obj2nid(p7->type);
1156 if (i != NID_pkcs7_signedAndEnveloped)
1157 return NULL;
1158 if (p7->d.signed_and_enveloped == NULL)
1159 return NULL;
1160 rsk=p7->d.signed_and_enveloped->recipientinfo;
1161 if (rsk == NULL)
1162 return NULL;
1163 ri=sk_PKCS7_RECIP_INFO_value(rsk,0);
1164 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx) return(NULL);
1165 ri=sk_PKCS7_RECIP_INFO_value(rsk,idx);
1166 return(ri->issuer_and_serial);
1167 }
1168
1169 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1170 {
1171 return(get_attribute(si->auth_attr,nid));
1172 }
1173
1174 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1175 {
1176 return(get_attribute(si->unauth_attr,nid));
1177 }
1178
1179 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1180 {
1181 int i;
1182 X509_ATTRIBUTE *xa;
1183 ASN1_OBJECT *o;
1184
1185 o=OBJ_nid2obj(nid);
1186 if (!o || !sk) return(NULL);
1187 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1188 {
1189 xa=sk_X509_ATTRIBUTE_value(sk,i);
1190 if (OBJ_cmp(xa->object,o) == 0)
1191 {
1192 if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1193 return(sk_ASN1_TYPE_value(xa->value.set,0));
1194 else
1195 return(NULL);
1196 }
1197 }
1198 return(NULL);
1199 }
1200
1201 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1202 {
1203 ASN1_TYPE *astype;
1204 if(!(astype = get_attribute(sk, NID_pkcs9_messageDigest))) return NULL;
1205 return astype->value.octet_string;
1206 }
1207
1208 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1209 STACK_OF(X509_ATTRIBUTE) *sk)
1210 {
1211 int i;
1212
1213 if (p7si->auth_attr != NULL)
1214 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr,X509_ATTRIBUTE_free);
1215 p7si->auth_attr=sk_X509_ATTRIBUTE_dup(sk);
1216 if (p7si->auth_attr == NULL)
1217 return 0;
1218 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1219 {
1220 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr,i,
1221 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1222 == NULL)
1223 return(0);
1224 }
1225 return(1);
1226 }
1227
1228 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si, STACK_OF(X509_ATTRIBUTE) *sk)
1229 {
1230 int i;
1231
1232 if (p7si->unauth_attr != NULL)
1233 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr,
1234 X509_ATTRIBUTE_free);
1235 p7si->unauth_attr=sk_X509_ATTRIBUTE_dup(sk);
1236 if (p7si->unauth_attr == NULL)
1237 return 0;
1238 for (i=0; i<sk_X509_ATTRIBUTE_num(sk); i++)
1239 {
1240 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr,i,
1241 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value(sk,i))))
1242 == NULL)
1243 return(0);
1244 }
1245 return(1);
1246 }
1247
1248 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1249 void *value)
1250 {
1251 return(add_attribute(&(p7si->auth_attr),nid,atrtype,value));
1252 }
1253
1254 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1255 void *value)
1256 {
1257 return(add_attribute(&(p7si->unauth_attr),nid,atrtype,value));
1258 }
1259
1260 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1261 void *value)
1262 {
1263 X509_ATTRIBUTE *attr=NULL;
1264
1265 if (*sk == NULL)
1266 {
1267 *sk = sk_X509_ATTRIBUTE_new_null();
1268 if (*sk == NULL)
1269 return 0;
1270 new_attrib:
1271 if (!(attr=X509_ATTRIBUTE_create(nid,atrtype,value)))
1272 return 0;
1273 if (!sk_X509_ATTRIBUTE_push(*sk,attr))
1274 {
1275 X509_ATTRIBUTE_free(attr);
1276 return 0;
1277 }
1278 }
1279 else
1280 {
1281 int i;
1282
1283 for (i=0; i<sk_X509_ATTRIBUTE_num(*sk); i++)
1284 {
1285 attr=sk_X509_ATTRIBUTE_value(*sk,i);
1286 if (OBJ_obj2nid(attr->object) == nid)
1287 {
1288 X509_ATTRIBUTE_free(attr);
1289 attr=X509_ATTRIBUTE_create(nid,atrtype,value);
1290 if (attr == NULL)
1291 return 0;
1292 if (!sk_X509_ATTRIBUTE_set(*sk,i,attr))
1293 {
1294 X509_ATTRIBUTE_free(attr);
1295 return 0;
1296 }
1297 goto end;
1298 }
1299 }
1300 goto new_attrib;
1301 }
1302 end:
1303 return(1);
1304 }
1305