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
PKCS7_type_is_other(PKCS7 * p7)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 case NID_pkcs7_data:
79 case NID_pkcs7_signed:
80 case NID_pkcs7_enveloped:
81 case NID_pkcs7_signedAndEnveloped:
82 case NID_pkcs7_digest:
83 case NID_pkcs7_encrypted:
84 isOther = 0;
85 break;
86 default:
87 isOther = 1;
88 }
89
90 return isOther;
91
92 }
93
PKCS7_get_octet_string(PKCS7 * p7)94 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
95 {
96 if (PKCS7_type_is_data(p7))
97 return p7->d.data;
98 if (PKCS7_type_is_other(p7) && p7->d.other
99 && (p7->d.other->type == V_ASN1_OCTET_STRING))
100 return p7->d.other->value.octet_string;
101 return NULL;
102 }
103
PKCS7_bio_add_digest(BIO ** pbio,X509_ALGOR * alg)104 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
105 {
106 BIO *btmp;
107 const EVP_MD *md;
108 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
109 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
110 goto err;
111 }
112
113 md = EVP_get_digestbyobj(alg->algorithm);
114 if (md == NULL) {
115 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
116 goto err;
117 }
118
119 BIO_set_md(btmp, md);
120 if (*pbio == NULL)
121 *pbio = btmp;
122 else if (!BIO_push(*pbio, btmp)) {
123 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
124 goto err;
125 }
126 btmp = NULL;
127
128 return 1;
129
130 err:
131 if (btmp)
132 BIO_free(btmp);
133 return 0;
134
135 }
136
pkcs7_encode_rinfo(PKCS7_RECIP_INFO * ri,unsigned char * key,int keylen)137 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
138 unsigned char *key, int keylen)
139 {
140 EVP_PKEY_CTX *pctx = NULL;
141 EVP_PKEY *pkey = NULL;
142 unsigned char *ek = NULL;
143 int ret = 0;
144 size_t eklen;
145
146 pkey = X509_get_pubkey(ri->cert);
147
148 if (!pkey)
149 return 0;
150
151 pctx = EVP_PKEY_CTX_new(pkey, NULL);
152 if (!pctx)
153 return 0;
154
155 if (EVP_PKEY_encrypt_init(pctx) <= 0)
156 goto err;
157
158 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
159 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
160 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
161 goto err;
162 }
163
164 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
165 goto err;
166
167 ek = OPENSSL_malloc(eklen);
168
169 if (ek == NULL) {
170 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
171 goto err;
172 }
173
174 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
175 goto err;
176
177 ASN1_STRING_set0(ri->enc_key, ek, eklen);
178 ek = NULL;
179
180 ret = 1;
181
182 err:
183 if (pkey)
184 EVP_PKEY_free(pkey);
185 if (pctx)
186 EVP_PKEY_CTX_free(pctx);
187 if (ek)
188 OPENSSL_free(ek);
189 return ret;
190
191 }
192
pkcs7_decrypt_rinfo(unsigned char ** pek,int * peklen,PKCS7_RECIP_INFO * ri,EVP_PKEY * pkey,size_t fixlen)193 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
194 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
195 size_t fixlen)
196 {
197 EVP_PKEY_CTX *pctx = NULL;
198 unsigned char *ek = NULL;
199 size_t eklen;
200
201 int ret = -1;
202
203 pctx = EVP_PKEY_CTX_new(pkey, NULL);
204 if (!pctx)
205 return -1;
206
207 if (EVP_PKEY_decrypt_init(pctx) <= 0)
208 goto err;
209
210 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
211 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
212 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
213 goto err;
214 }
215
216 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
217 ri->enc_key->data, ri->enc_key->length) <= 0)
218 goto err;
219
220 ek = OPENSSL_malloc(eklen);
221
222 if (ek == NULL) {
223 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
224 goto err;
225 }
226
227 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
228 ri->enc_key->data, ri->enc_key->length) <= 0
229 || eklen == 0
230 || (fixlen != 0 && eklen != fixlen)) {
231 ret = 0;
232 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
233 goto err;
234 }
235
236 ret = 1;
237
238 if (*pek) {
239 OPENSSL_cleanse(*pek, *peklen);
240 OPENSSL_free(*pek);
241 }
242
243 *pek = ek;
244 *peklen = eklen;
245
246 err:
247 if (pctx)
248 EVP_PKEY_CTX_free(pctx);
249 if (!ret && ek)
250 OPENSSL_free(ek);
251
252 return ret;
253 }
254
PKCS7_dataInit(PKCS7 * p7,BIO * bio)255 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
256 {
257 int i;
258 BIO *out = NULL, *btmp = NULL;
259 X509_ALGOR *xa = NULL;
260 const EVP_CIPHER *evp_cipher = NULL;
261 STACK_OF(X509_ALGOR) *md_sk = NULL;
262 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
263 X509_ALGOR *xalg = NULL;
264 PKCS7_RECIP_INFO *ri = NULL;
265 ASN1_OCTET_STRING *os = NULL;
266
267 if (p7 == NULL) {
268 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
269 return NULL;
270 }
271 /*
272 * The content field in the PKCS7 ContentInfo is optional, but that really
273 * only applies to inner content (precisely, detached signatures).
274 *
275 * When reading content, missing outer content is therefore treated as an
276 * error.
277 *
278 * When creating content, PKCS7_content_new() must be called before
279 * calling this method, so a NULL p7->d is always an error.
280 */
281 if (p7->d.ptr == NULL) {
282 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
283 return NULL;
284 }
285
286 i = OBJ_obj2nid(p7->type);
287 p7->state = PKCS7_S_HEADER;
288
289 switch (i) {
290 case NID_pkcs7_signed:
291 md_sk = p7->d.sign->md_algs;
292 os = PKCS7_get_octet_string(p7->d.sign->contents);
293 break;
294 case NID_pkcs7_signedAndEnveloped:
295 rsk = p7->d.signed_and_enveloped->recipientinfo;
296 md_sk = p7->d.signed_and_enveloped->md_algs;
297 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
298 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
299 if (evp_cipher == NULL) {
300 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
301 goto err;
302 }
303 break;
304 case NID_pkcs7_enveloped:
305 rsk = p7->d.enveloped->recipientinfo;
306 xalg = p7->d.enveloped->enc_data->algorithm;
307 evp_cipher = p7->d.enveloped->enc_data->cipher;
308 if (evp_cipher == NULL) {
309 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
310 goto err;
311 }
312 break;
313 case NID_pkcs7_digest:
314 xa = p7->d.digest->md;
315 os = PKCS7_get_octet_string(p7->d.digest->contents);
316 break;
317 case NID_pkcs7_data:
318 break;
319 default:
320 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
321 goto err;
322 }
323
324 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
325 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
326 goto err;
327
328 if (xa && !PKCS7_bio_add_digest(&out, xa))
329 goto err;
330
331 if (evp_cipher != NULL) {
332 unsigned char key[EVP_MAX_KEY_LENGTH];
333 unsigned char iv[EVP_MAX_IV_LENGTH];
334 int keylen, ivlen;
335 EVP_CIPHER_CTX *ctx;
336
337 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
338 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
339 goto err;
340 }
341 BIO_get_cipher_ctx(btmp, &ctx);
342 keylen = EVP_CIPHER_key_length(evp_cipher);
343 ivlen = EVP_CIPHER_iv_length(evp_cipher);
344 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
345 if (ivlen > 0)
346 if (RAND_bytes(iv, ivlen) <= 0)
347 goto err;
348 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
349 goto err;
350 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
351 goto err;
352 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
353 goto err;
354
355 if (ivlen > 0) {
356 if (xalg->parameter == NULL) {
357 xalg->parameter = ASN1_TYPE_new();
358 if (xalg->parameter == NULL)
359 goto err;
360 }
361 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
362 goto err;
363 }
364
365 /* Lets do the pub key stuff :-) */
366 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
367 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
368 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
369 goto err;
370 }
371 OPENSSL_cleanse(key, keylen);
372
373 if (out == NULL)
374 out = btmp;
375 else
376 BIO_push(out, btmp);
377 btmp = NULL;
378 }
379
380 if (bio == NULL) {
381 if (PKCS7_is_detached(p7)) {
382 bio = BIO_new(BIO_s_null());
383 } else if (os && os->length > 0) {
384 bio = BIO_new_mem_buf(os->data, os->length);
385 } else {
386 bio = BIO_new(BIO_s_mem());
387 if (bio == NULL)
388 goto err;
389 BIO_set_mem_eof_return(bio, 0);
390 }
391 if (bio == NULL)
392 goto err;
393 }
394 if (out)
395 BIO_push(out, bio);
396 else
397 out = bio;
398 bio = NULL;
399 if (0) {
400 err:
401 if (out != NULL)
402 BIO_free_all(out);
403 if (btmp != NULL)
404 BIO_free_all(btmp);
405 out = NULL;
406 }
407 return (out);
408 }
409
pkcs7_cmp_ri(PKCS7_RECIP_INFO * ri,X509 * pcert)410 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
411 {
412 int ret;
413 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
414 pcert->cert_info->issuer);
415 if (ret)
416 return ret;
417 return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
418 ri->issuer_and_serial->serial);
419 }
420
421 /* int */
PKCS7_dataDecode(PKCS7 * p7,EVP_PKEY * pkey,BIO * in_bio,X509 * pcert)422 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
423 {
424 int i, j;
425 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
426 X509_ALGOR *xa;
427 ASN1_OCTET_STRING *data_body = NULL;
428 const EVP_MD *evp_md;
429 const EVP_CIPHER *evp_cipher = NULL;
430 EVP_CIPHER_CTX *evp_ctx = NULL;
431 X509_ALGOR *enc_alg = NULL;
432 STACK_OF(X509_ALGOR) *md_sk = NULL;
433 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
434 PKCS7_RECIP_INFO *ri = NULL;
435 unsigned char *ek = NULL, *tkey = NULL;
436 int eklen = 0, tkeylen = 0;
437
438 if (p7 == NULL) {
439 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
440 return NULL;
441 }
442
443 if (p7->d.ptr == NULL) {
444 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
445 return NULL;
446 }
447
448 i = OBJ_obj2nid(p7->type);
449 p7->state = PKCS7_S_HEADER;
450
451 switch (i) {
452 case NID_pkcs7_signed:
453 /*
454 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
455 * field and optional content.
456 * data_body is NULL if that structure has no (=detached) content
457 * or if the contentType is wrong (i.e., not "data").
458 */
459 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
460 if (!PKCS7_is_detached(p7) && data_body == NULL) {
461 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
462 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
463 goto err;
464 }
465 md_sk = p7->d.sign->md_algs;
466 break;
467 case NID_pkcs7_signedAndEnveloped:
468 rsk = p7->d.signed_and_enveloped->recipientinfo;
469 md_sk = p7->d.signed_and_enveloped->md_algs;
470 /* data_body is NULL if the optional EncryptedContent is missing. */
471 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
472 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
473 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
474 if (evp_cipher == NULL) {
475 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
476 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
477 goto err;
478 }
479 break;
480 case NID_pkcs7_enveloped:
481 rsk = p7->d.enveloped->recipientinfo;
482 enc_alg = p7->d.enveloped->enc_data->algorithm;
483 /* data_body is NULL if the optional EncryptedContent is missing. */
484 data_body = p7->d.enveloped->enc_data->enc_data;
485 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
486 if (evp_cipher == NULL) {
487 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
488 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
489 goto err;
490 }
491 break;
492 default:
493 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
494 goto err;
495 }
496
497 /* Detached content must be supplied via in_bio instead. */
498 if (data_body == NULL && in_bio == NULL) {
499 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
500 goto err;
501 }
502
503 /* We will be checking the signature */
504 if (md_sk != NULL) {
505 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
506 xa = sk_X509_ALGOR_value(md_sk, i);
507 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
508 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
509 goto err;
510 }
511
512 j = OBJ_obj2nid(xa->algorithm);
513 evp_md = EVP_get_digestbynid(j);
514 if (evp_md == NULL) {
515 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
516 PKCS7_R_UNKNOWN_DIGEST_TYPE);
517 goto err;
518 }
519
520 BIO_set_md(btmp, evp_md);
521 if (out == NULL)
522 out = btmp;
523 else
524 BIO_push(out, btmp);
525 btmp = NULL;
526 }
527 }
528
529 if (evp_cipher != NULL) {
530 #if 0
531 unsigned char key[EVP_MAX_KEY_LENGTH];
532 unsigned char iv[EVP_MAX_IV_LENGTH];
533 unsigned char *p;
534 int keylen, ivlen;
535 int max;
536 X509_OBJECT ret;
537 #endif
538
539 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
540 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
541 goto err;
542 }
543
544 /*
545 * It was encrypted, we need to decrypt the secret key with the
546 * private key
547 */
548
549 /*
550 * Find the recipientInfo which matches the passed certificate (if
551 * any)
552 */
553
554 if (pcert) {
555 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
556 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
557 if (!pkcs7_cmp_ri(ri, pcert))
558 break;
559 ri = NULL;
560 }
561 if (ri == NULL) {
562 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
563 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
564 goto err;
565 }
566 }
567
568 /* If we haven't got a certificate try each ri in turn */
569 if (pcert == NULL) {
570 /*
571 * Always attempt to decrypt all rinfo even after sucess as a
572 * defence against MMA timing attacks.
573 */
574 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
575 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
576
577 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
578 EVP_CIPHER_key_length(evp_cipher)) < 0)
579 goto err;
580 ERR_clear_error();
581 }
582 } else {
583 /* Only exit on fatal errors, not decrypt failure */
584 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
585 goto err;
586 ERR_clear_error();
587 }
588
589 evp_ctx = NULL;
590 BIO_get_cipher_ctx(etmp, &evp_ctx);
591 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
592 goto err;
593 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
594 goto err;
595 /* Generate random key as MMA defence */
596 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
597 tkey = OPENSSL_malloc(tkeylen);
598 if (!tkey)
599 goto err;
600 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
601 goto err;
602 if (ek == NULL) {
603 ek = tkey;
604 eklen = tkeylen;
605 tkey = NULL;
606 }
607
608 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
609 /*
610 * Some S/MIME clients don't use the same key and effective key
611 * length. The key length is determined by the size of the
612 * decrypted RSA key.
613 */
614 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
615 /* Use random key as MMA defence */
616 OPENSSL_cleanse(ek, eklen);
617 OPENSSL_free(ek);
618 ek = tkey;
619 eklen = tkeylen;
620 tkey = NULL;
621 }
622 }
623 /* Clear errors so we don't leak information useful in MMA */
624 ERR_clear_error();
625 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
626 goto err;
627
628 if (ek) {
629 OPENSSL_cleanse(ek, eklen);
630 OPENSSL_free(ek);
631 ek = NULL;
632 }
633 if (tkey) {
634 OPENSSL_cleanse(tkey, tkeylen);
635 OPENSSL_free(tkey);
636 tkey = NULL;
637 }
638
639 if (out == NULL)
640 out = etmp;
641 else
642 BIO_push(out, etmp);
643 etmp = NULL;
644 }
645 #if 1
646 if (in_bio != NULL) {
647 bio = in_bio;
648 } else {
649 # if 0
650 bio = BIO_new(BIO_s_mem());
651 if (bio == NULL)
652 goto err;
653 /*
654 * We need to set this so that when we have read all the data, the
655 * encrypt BIO, if present, will read EOF and encode the last few
656 * bytes
657 */
658 BIO_set_mem_eof_return(bio, 0);
659
660 if (data_body->length > 0)
661 BIO_write(bio, (char *)data_body->data, data_body->length);
662 # else
663 if (data_body->length > 0)
664 bio = BIO_new_mem_buf(data_body->data, data_body->length);
665 else {
666 bio = BIO_new(BIO_s_mem());
667 if (bio == NULL)
668 goto err;
669 BIO_set_mem_eof_return(bio, 0);
670 }
671 if (bio == NULL)
672 goto err;
673 # endif
674 }
675 BIO_push(out, bio);
676 bio = NULL;
677 #endif
678 if (0) {
679 err:
680 if (ek) {
681 OPENSSL_cleanse(ek, eklen);
682 OPENSSL_free(ek);
683 }
684 if (tkey) {
685 OPENSSL_cleanse(tkey, tkeylen);
686 OPENSSL_free(tkey);
687 }
688 if (out != NULL)
689 BIO_free_all(out);
690 if (btmp != NULL)
691 BIO_free_all(btmp);
692 if (etmp != NULL)
693 BIO_free_all(etmp);
694 if (bio != NULL)
695 BIO_free_all(bio);
696 out = NULL;
697 }
698 return (out);
699 }
700
PKCS7_find_digest(EVP_MD_CTX ** pmd,BIO * bio,int nid)701 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
702 {
703 for (;;) {
704 bio = BIO_find_type(bio, BIO_TYPE_MD);
705 if (bio == NULL) {
706 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
707 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
708 return NULL;
709 }
710 BIO_get_md_ctx(bio, pmd);
711 if (*pmd == NULL) {
712 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
713 return NULL;
714 }
715 if (EVP_MD_CTX_type(*pmd) == nid)
716 return bio;
717 bio = BIO_next(bio);
718 }
719 return NULL;
720 }
721
do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO * si,EVP_MD_CTX * mctx)722 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
723 {
724 unsigned char md_data[EVP_MAX_MD_SIZE];
725 unsigned int md_len;
726
727 /* Add signing time if not already present */
728 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
729 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
730 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
731 return 0;
732 }
733 }
734
735 /* Add digest */
736 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
737 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
738 return 0;
739 }
740 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
741 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
742 return 0;
743 }
744
745 /* Now sign the attributes */
746 if (!PKCS7_SIGNER_INFO_sign(si))
747 return 0;
748
749 return 1;
750 }
751
PKCS7_dataFinal(PKCS7 * p7,BIO * bio)752 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
753 {
754 int ret = 0;
755 int i, j;
756 BIO *btmp;
757 PKCS7_SIGNER_INFO *si;
758 EVP_MD_CTX *mdc, ctx_tmp;
759 STACK_OF(X509_ATTRIBUTE) *sk;
760 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
761 ASN1_OCTET_STRING *os = NULL;
762
763 if (p7 == NULL) {
764 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
765 return 0;
766 }
767
768 if (p7->d.ptr == NULL) {
769 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
770 return 0;
771 }
772
773 EVP_MD_CTX_init(&ctx_tmp);
774 i = OBJ_obj2nid(p7->type);
775 p7->state = PKCS7_S_HEADER;
776
777 switch (i) {
778 case NID_pkcs7_data:
779 os = p7->d.data;
780 break;
781 case NID_pkcs7_signedAndEnveloped:
782 /* XXXXXXXXXXXXXXXX */
783 si_sk = p7->d.signed_and_enveloped->signer_info;
784 os = p7->d.signed_and_enveloped->enc_data->enc_data;
785 if (!os) {
786 os = M_ASN1_OCTET_STRING_new();
787 if (!os) {
788 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
789 goto err;
790 }
791 p7->d.signed_and_enveloped->enc_data->enc_data = os;
792 }
793 break;
794 case NID_pkcs7_enveloped:
795 /* XXXXXXXXXXXXXXXX */
796 os = p7->d.enveloped->enc_data->enc_data;
797 if (!os) {
798 os = M_ASN1_OCTET_STRING_new();
799 if (!os) {
800 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
801 goto err;
802 }
803 p7->d.enveloped->enc_data->enc_data = os;
804 }
805 break;
806 case NID_pkcs7_signed:
807 si_sk = p7->d.sign->signer_info;
808 os = PKCS7_get_octet_string(p7->d.sign->contents);
809 /* If detached data then the content is excluded */
810 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
811 M_ASN1_OCTET_STRING_free(os);
812 os = NULL;
813 p7->d.sign->contents->d.data = NULL;
814 }
815 break;
816
817 case NID_pkcs7_digest:
818 os = PKCS7_get_octet_string(p7->d.digest->contents);
819 /* If detached data then the content is excluded */
820 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
821 M_ASN1_OCTET_STRING_free(os);
822 os = NULL;
823 p7->d.digest->contents->d.data = NULL;
824 }
825 break;
826
827 default:
828 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
829 goto err;
830 }
831
832 if (si_sk != NULL) {
833 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
834 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
835 if (si->pkey == NULL)
836 continue;
837
838 j = OBJ_obj2nid(si->digest_alg->algorithm);
839
840 btmp = bio;
841
842 btmp = PKCS7_find_digest(&mdc, btmp, j);
843
844 if (btmp == NULL)
845 goto err;
846
847 /*
848 * We now have the EVP_MD_CTX, lets do the signing.
849 */
850 if (!EVP_MD_CTX_copy_ex(&ctx_tmp, mdc))
851 goto err;
852
853 sk = si->auth_attr;
854
855 /*
856 * If there are attributes, we add the digest attribute and only
857 * sign the attributes
858 */
859 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
860 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
861 goto err;
862 } else {
863 unsigned char *abuf = NULL;
864 unsigned int abuflen;
865 abuflen = EVP_PKEY_size(si->pkey);
866 abuf = OPENSSL_malloc(abuflen);
867 if (!abuf)
868 goto err;
869
870 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen, si->pkey)) {
871 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
872 goto err;
873 }
874 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
875 }
876 }
877 } else if (i == NID_pkcs7_digest) {
878 unsigned char md_data[EVP_MAX_MD_SIZE];
879 unsigned int md_len;
880 if (!PKCS7_find_digest(&mdc, bio,
881 OBJ_obj2nid(p7->d.digest->md->algorithm)))
882 goto err;
883 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
884 goto err;
885 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
886 }
887
888 if (!PKCS7_is_detached(p7)) {
889 /*
890 * NOTE(emilia): I think we only reach os == NULL here because detached
891 * digested data support is broken.
892 */
893 if (os == NULL)
894 goto err;
895 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
896 char *cont;
897 long contlen;
898 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
899 if (btmp == NULL) {
900 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
901 goto err;
902 }
903 contlen = BIO_get_mem_data(btmp, &cont);
904 /*
905 * Mark the BIO read only then we can use its copy of the data
906 * instead of making an extra copy.
907 */
908 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
909 BIO_set_mem_eof_return(btmp, 0);
910 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
911 }
912 }
913 ret = 1;
914 err:
915 EVP_MD_CTX_cleanup(&ctx_tmp);
916 return (ret);
917 }
918
PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO * si)919 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
920 {
921 EVP_MD_CTX mctx;
922 EVP_PKEY_CTX *pctx;
923 unsigned char *abuf = NULL;
924 int alen;
925 size_t siglen;
926 const EVP_MD *md = NULL;
927
928 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
929 if (md == NULL)
930 return 0;
931
932 EVP_MD_CTX_init(&mctx);
933 if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
934 goto err;
935
936 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
937 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
938 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
939 goto err;
940 }
941
942 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
943 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
944 if (!abuf)
945 goto err;
946 if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
947 goto err;
948 OPENSSL_free(abuf);
949 abuf = NULL;
950 if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
951 goto err;
952 abuf = OPENSSL_malloc(siglen);
953 if (!abuf)
954 goto err;
955 if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
956 goto err;
957
958 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
959 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
960 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
961 goto err;
962 }
963
964 EVP_MD_CTX_cleanup(&mctx);
965
966 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
967
968 return 1;
969
970 err:
971 if (abuf)
972 OPENSSL_free(abuf);
973 EVP_MD_CTX_cleanup(&mctx);
974 return 0;
975
976 }
977
PKCS7_dataVerify(X509_STORE * cert_store,X509_STORE_CTX * ctx,BIO * bio,PKCS7 * p7,PKCS7_SIGNER_INFO * si)978 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
979 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
980 {
981 PKCS7_ISSUER_AND_SERIAL *ias;
982 int ret = 0, i;
983 STACK_OF(X509) *cert;
984 X509 *x509;
985
986 if (p7 == NULL) {
987 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
988 return 0;
989 }
990
991 if (p7->d.ptr == NULL) {
992 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
993 return 0;
994 }
995
996 if (PKCS7_type_is_signed(p7)) {
997 cert = p7->d.sign->cert;
998 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
999 cert = p7->d.signed_and_enveloped->cert;
1000 } else {
1001 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1002 goto err;
1003 }
1004 /* XXXXXXXXXXXXXXXXXXXXXXX */
1005 ias = si->issuer_and_serial;
1006
1007 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
1008
1009 /* were we able to find the cert in passed to us */
1010 if (x509 == NULL) {
1011 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
1012 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
1013 goto err;
1014 }
1015
1016 /* Lets verify */
1017 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
1018 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1019 goto err;
1020 }
1021 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1022 i = X509_verify_cert(ctx);
1023 if (i <= 0) {
1024 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1025 X509_STORE_CTX_cleanup(ctx);
1026 goto err;
1027 }
1028 X509_STORE_CTX_cleanup(ctx);
1029
1030 return PKCS7_signatureVerify(bio, p7, si, x509);
1031 err:
1032 return ret;
1033 }
1034
PKCS7_signatureVerify(BIO * bio,PKCS7 * p7,PKCS7_SIGNER_INFO * si,X509 * x509)1035 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1036 X509 *x509)
1037 {
1038 ASN1_OCTET_STRING *os;
1039 EVP_MD_CTX mdc_tmp, *mdc;
1040 int ret = 0, i;
1041 int md_type;
1042 STACK_OF(X509_ATTRIBUTE) *sk;
1043 BIO *btmp;
1044 EVP_PKEY *pkey;
1045
1046 EVP_MD_CTX_init(&mdc_tmp);
1047
1048 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1049 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1050 goto err;
1051 }
1052
1053 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1054
1055 btmp = bio;
1056 for (;;) {
1057 if ((btmp == NULL) ||
1058 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1059 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1060 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1061 goto err;
1062 }
1063 BIO_get_md_ctx(btmp, &mdc);
1064 if (mdc == NULL) {
1065 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1066 goto err;
1067 }
1068 if (EVP_MD_CTX_type(mdc) == md_type)
1069 break;
1070 /*
1071 * Workaround for some broken clients that put the signature OID
1072 * instead of the digest OID in digest_alg->algorithm
1073 */
1074 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1075 break;
1076 btmp = BIO_next(btmp);
1077 }
1078
1079 /*
1080 * mdc is the digest ctx that we want, unless there are attributes, in
1081 * which case the digest is the signed attributes
1082 */
1083 if (!EVP_MD_CTX_copy_ex(&mdc_tmp, mdc))
1084 goto err;
1085
1086 sk = si->auth_attr;
1087 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1088 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1089 unsigned int md_len;
1090 int alen;
1091 ASN1_OCTET_STRING *message_digest;
1092
1093 if (!EVP_DigestFinal_ex(&mdc_tmp, md_dat, &md_len))
1094 goto err;
1095 message_digest = PKCS7_digest_from_attributes(sk);
1096 if (!message_digest) {
1097 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1098 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1099 goto err;
1100 }
1101 if ((message_digest->length != (int)md_len) ||
1102 (memcmp(message_digest->data, md_dat, md_len))) {
1103 #if 0
1104 {
1105 int ii;
1106 for (ii = 0; ii < message_digest->length; ii++)
1107 printf("%02X", message_digest->data[ii]);
1108 printf(" sent\n");
1109 for (ii = 0; ii < md_len; ii++)
1110 printf("%02X", md_dat[ii]);
1111 printf(" calc\n");
1112 }
1113 #endif
1114 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1115 ret = -1;
1116 goto err;
1117 }
1118
1119 if (!EVP_VerifyInit_ex(&mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1120 goto err;
1121
1122 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1123 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1124 if (alen <= 0) {
1125 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1126 ret = -1;
1127 goto err;
1128 }
1129 if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1130 goto err;
1131
1132 OPENSSL_free(abuf);
1133 }
1134
1135 os = si->enc_digest;
1136 pkey = X509_get_pubkey(x509);
1137 if (!pkey) {
1138 ret = -1;
1139 goto err;
1140 }
1141
1142 i = EVP_VerifyFinal(&mdc_tmp, os->data, os->length, pkey);
1143 EVP_PKEY_free(pkey);
1144 if (i <= 0) {
1145 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1146 ret = -1;
1147 goto err;
1148 } else
1149 ret = 1;
1150 err:
1151 EVP_MD_CTX_cleanup(&mdc_tmp);
1152 return (ret);
1153 }
1154
PKCS7_get_issuer_and_serial(PKCS7 * p7,int idx)1155 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1156 {
1157 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1158 PKCS7_RECIP_INFO *ri;
1159 int i;
1160
1161 i = OBJ_obj2nid(p7->type);
1162 if (i != NID_pkcs7_signedAndEnveloped)
1163 return NULL;
1164 if (p7->d.signed_and_enveloped == NULL)
1165 return NULL;
1166 rsk = p7->d.signed_and_enveloped->recipientinfo;
1167 if (rsk == NULL)
1168 return NULL;
1169 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1170 return (NULL);
1171 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1172 return (ri->issuer_and_serial);
1173 }
1174
PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO * si,int nid)1175 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1176 {
1177 return (get_attribute(si->auth_attr, nid));
1178 }
1179
PKCS7_get_attribute(PKCS7_SIGNER_INFO * si,int nid)1180 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1181 {
1182 return (get_attribute(si->unauth_attr, nid));
1183 }
1184
get_attribute(STACK_OF (X509_ATTRIBUTE)* sk,int nid)1185 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1186 {
1187 int i;
1188 X509_ATTRIBUTE *xa;
1189 ASN1_OBJECT *o;
1190
1191 o = OBJ_nid2obj(nid);
1192 if (!o || !sk)
1193 return (NULL);
1194 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1195 xa = sk_X509_ATTRIBUTE_value(sk, i);
1196 if (OBJ_cmp(xa->object, o) == 0) {
1197 if (!xa->single && sk_ASN1_TYPE_num(xa->value.set))
1198 return (sk_ASN1_TYPE_value(xa->value.set, 0));
1199 else
1200 return (NULL);
1201 }
1202 }
1203 return (NULL);
1204 }
1205
PKCS7_digest_from_attributes(STACK_OF (X509_ATTRIBUTE)* sk)1206 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1207 {
1208 ASN1_TYPE *astype;
1209 if (!(astype = get_attribute(sk, NID_pkcs9_messageDigest)))
1210 return NULL;
1211 return astype->value.octet_string;
1212 }
1213
PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1214 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1215 STACK_OF(X509_ATTRIBUTE) *sk)
1216 {
1217 int i;
1218
1219 if (p7si->auth_attr != NULL)
1220 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1221 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1222 if (p7si->auth_attr == NULL)
1223 return 0;
1224 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1225 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1226 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1227 (sk, i))))
1228 == NULL)
1229 return (0);
1230 }
1231 return (1);
1232 }
1233
PKCS7_set_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1234 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1235 STACK_OF(X509_ATTRIBUTE) *sk)
1236 {
1237 int i;
1238
1239 if (p7si->unauth_attr != NULL)
1240 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1241 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1242 if (p7si->unauth_attr == NULL)
1243 return 0;
1244 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1245 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1246 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1247 (sk, i))))
1248 == NULL)
1249 return (0);
1250 }
1251 return (1);
1252 }
1253
PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1254 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1255 void *value)
1256 {
1257 return (add_attribute(&(p7si->auth_attr), nid, atrtype, value));
1258 }
1259
PKCS7_add_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1260 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1261 void *value)
1262 {
1263 return (add_attribute(&(p7si->unauth_attr), nid, atrtype, value));
1264 }
1265
add_attribute(STACK_OF (X509_ATTRIBUTE)** sk,int nid,int atrtype,void * value)1266 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1267 void *value)
1268 {
1269 X509_ATTRIBUTE *attr = NULL;
1270
1271 if (*sk == NULL) {
1272 *sk = sk_X509_ATTRIBUTE_new_null();
1273 if (*sk == NULL)
1274 return 0;
1275 new_attrib:
1276 if (!(attr = X509_ATTRIBUTE_create(nid, atrtype, value)))
1277 return 0;
1278 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1279 X509_ATTRIBUTE_free(attr);
1280 return 0;
1281 }
1282 } else {
1283 int i;
1284
1285 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1286 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1287 if (OBJ_obj2nid(attr->object) == nid) {
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 X509_ATTRIBUTE_free(attr);
1294 return 0;
1295 }
1296 goto end;
1297 }
1298 }
1299 goto new_attrib;
1300 }
1301 end:
1302 return (1);
1303 }
1304