1 /*
2 * Copyright 1995-2025 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
21 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
22 void *value);
23 static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid);
24
PKCS7_type_is_other(PKCS7 * p7)25 int 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
PKCS7_get_octet_string(PKCS7 * p7)48 ASN1_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
pkcs7_get1_data(PKCS7 * p7)58 static ASN1_OCTET_STRING *pkcs7_get1_data(PKCS7 *p7)
59 {
60 ASN1_OCTET_STRING *os = PKCS7_get_octet_string(p7);
61
62 if (os != NULL) {
63 /* Edge case for MIME content, see RFC 5652 section-5.2.1 */
64 ASN1_OCTET_STRING *osdup = ASN1_OCTET_STRING_dup(os);
65
66 if (osdup != NULL && (os->flags & ASN1_STRING_FLAG_NDEF))
67 /* ASN1_STRING_FLAG_NDEF flag is currently used by openssl-smime */
68 ASN1_STRING_set0(osdup, NULL, 0);
69 return osdup;
70 }
71
72 /* General case for PKCS#7 content, see RFC 2315 section-7 */
73 if (PKCS7_type_is_other(p7) && (p7->d.other != NULL)
74 && (p7->d.other->type == V_ASN1_SEQUENCE)
75 && (p7->d.other->value.sequence != NULL)
76 && (p7->d.other->value.sequence->length > 0)) {
77 const unsigned char *data = p7->d.other->value.sequence->data;
78 long len;
79 int inf, tag, class;
80
81 os = ASN1_OCTET_STRING_new();
82 if (os == NULL)
83 return NULL;
84 inf = ASN1_get_object(&data, &len, &tag, &class,
85 p7->d.other->value.sequence->length);
86 if (inf != V_ASN1_CONSTRUCTED || tag != V_ASN1_SEQUENCE
87 || !ASN1_OCTET_STRING_set(os, data, len)) {
88 ASN1_OCTET_STRING_free(os);
89 os = NULL;
90 }
91 }
92 return os;
93 }
94
pkcs7_bio_add_digest(BIO ** pbio,X509_ALGOR * alg,const PKCS7_CTX * ctx)95 static int pkcs7_bio_add_digest(BIO **pbio, X509_ALGOR *alg,
96 const PKCS7_CTX *ctx)
97 {
98 BIO *btmp;
99 char name[OSSL_MAX_NAME_SIZE];
100 EVP_MD *fetched = NULL;
101 const EVP_MD *md;
102
103 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
104 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
105 goto err;
106 }
107
108 OBJ_obj2txt(name, sizeof(name), alg->algorithm, 0);
109
110 (void)ERR_set_mark();
111 fetched = EVP_MD_fetch(ossl_pkcs7_ctx_get0_libctx(ctx), name,
112 ossl_pkcs7_ctx_get0_propq(ctx));
113 if (fetched != NULL)
114 md = fetched;
115 else
116 md = EVP_get_digestbyname(name);
117
118 if (md == NULL) {
119 (void)ERR_clear_last_mark();
120 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
121 goto err;
122 }
123 (void)ERR_pop_to_mark();
124
125 if (BIO_set_md(btmp, md) <= 0) {
126 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
127 EVP_MD_free(fetched);
128 goto err;
129 }
130 EVP_MD_free(fetched);
131 if (*pbio == NULL)
132 *pbio = btmp;
133 else if (!BIO_push(*pbio, btmp)) {
134 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
135 goto err;
136 }
137 btmp = NULL;
138
139 return 1;
140
141 err:
142 BIO_free(btmp);
143 return 0;
144 }
145
pkcs7_encode_rinfo(PKCS7_RECIP_INFO * ri,unsigned char * key,int keylen)146 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
147 unsigned char *key, int keylen)
148 {
149 EVP_PKEY_CTX *pctx = NULL;
150 EVP_PKEY *pkey = NULL;
151 unsigned char *ek = NULL;
152 int ret = 0;
153 size_t eklen;
154 const PKCS7_CTX *ctx = ri->ctx;
155
156 pkey = X509_get0_pubkey(ri->cert);
157 if (pkey == NULL)
158 return 0;
159
160 pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
161 ossl_pkcs7_ctx_get0_propq(ctx));
162 if (pctx == NULL)
163 return 0;
164
165 if (EVP_PKEY_encrypt_init(pctx) <= 0)
166 goto err;
167
168 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
169 goto err;
170
171 ek = OPENSSL_malloc(eklen);
172 if (ek == NULL)
173 goto err;
174
175 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
176 goto err;
177
178 ASN1_STRING_set0(ri->enc_key, ek, eklen);
179 ek = NULL;
180
181 ret = 1;
182
183 err:
184 EVP_PKEY_CTX_free(pctx);
185 OPENSSL_free(ek);
186 return ret;
187
188 }
189
pkcs7_decrypt_rinfo(unsigned char ** pek,int * peklen,PKCS7_RECIP_INFO * ri,EVP_PKEY * pkey,size_t fixlen)190 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
191 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
192 size_t fixlen)
193 {
194 EVP_PKEY_CTX *pctx = NULL;
195 unsigned char *ek = NULL;
196 size_t eklen;
197 int ret = -1;
198 const PKCS7_CTX *ctx = ri->ctx;
199
200 pctx = EVP_PKEY_CTX_new_from_pkey(ossl_pkcs7_ctx_get0_libctx(ctx), pkey,
201 ossl_pkcs7_ctx_get0_propq(ctx));
202 if (pctx == NULL)
203 return -1;
204
205 if (EVP_PKEY_decrypt_init(pctx) <= 0)
206 goto err;
207
208 if (EVP_PKEY_is_a(pkey, "RSA"))
209 /* upper layer pkcs7 code incorrectly assumes that a successful RSA
210 * decryption means that the key matches ciphertext (which never
211 * was the case, implicit rejection or not), so to make it work
212 * disable implicit rejection for RSA keys */
213 EVP_PKEY_CTX_ctrl_str(pctx, "rsa_pkcs1_implicit_rejection", "0");
214
215 ret = evp_pkey_decrypt_alloc(pctx, &ek, &eklen, fixlen,
216 ri->enc_key->data, ri->enc_key->length);
217 if (ret <= 0)
218 goto err;
219
220 ret = 1;
221
222 OPENSSL_clear_free(*pek, *peklen);
223 *pek = ek;
224 *peklen = eklen;
225
226 err:
227 EVP_PKEY_CTX_free(pctx);
228 if (!ret)
229 OPENSSL_free(ek);
230
231 return ret;
232 }
233
PKCS7_dataInit(PKCS7 * p7,BIO * bio)234 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
235 {
236 int i;
237 BIO *out = NULL, *btmp = NULL;
238 X509_ALGOR *xa = NULL;
239 EVP_CIPHER *fetched_cipher = NULL;
240 const EVP_CIPHER *cipher;
241 const EVP_CIPHER *evp_cipher = NULL;
242 STACK_OF(X509_ALGOR) *md_sk = NULL;
243 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
244 X509_ALGOR *xalg = NULL;
245 PKCS7_RECIP_INFO *ri = NULL;
246 ASN1_OCTET_STRING *os = NULL;
247 const PKCS7_CTX *p7_ctx;
248 OSSL_LIB_CTX *libctx;
249 const char *propq;
250
251 if (p7 == NULL) {
252 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
253 return NULL;
254 }
255 p7_ctx = ossl_pkcs7_get0_ctx(p7);
256 libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
257 propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
258
259 /*
260 * The content field in the PKCS7 ContentInfo is optional, but that really
261 * only applies to inner content (precisely, detached signatures).
262 *
263 * When reading content, missing outer content is therefore treated as an
264 * error.
265 *
266 * When creating content, PKCS7_content_new() must be called before
267 * calling this method, so a NULL p7->d is always an error.
268 */
269 if (p7->d.ptr == NULL) {
270 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
271 return NULL;
272 }
273
274 i = OBJ_obj2nid(p7->type);
275 p7->state = PKCS7_S_HEADER;
276
277 switch (i) {
278 case NID_pkcs7_signed:
279 md_sk = p7->d.sign->md_algs;
280 os = pkcs7_get1_data(p7->d.sign->contents);
281 break;
282 case NID_pkcs7_signedAndEnveloped:
283 rsk = p7->d.signed_and_enveloped->recipientinfo;
284 md_sk = p7->d.signed_and_enveloped->md_algs;
285 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
286 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
287 if (evp_cipher == NULL) {
288 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
289 goto err;
290 }
291 break;
292 case NID_pkcs7_enveloped:
293 rsk = p7->d.enveloped->recipientinfo;
294 xalg = p7->d.enveloped->enc_data->algorithm;
295 evp_cipher = p7->d.enveloped->enc_data->cipher;
296 if (evp_cipher == NULL) {
297 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CIPHER_NOT_INITIALIZED);
298 goto err;
299 }
300 break;
301 case NID_pkcs7_digest:
302 xa = p7->d.digest->md;
303 os = pkcs7_get1_data(p7->d.digest->contents);
304 break;
305 case NID_pkcs7_data:
306 break;
307 default:
308 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
309 goto err;
310 }
311
312 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
313 if (!pkcs7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i), p7_ctx))
314 goto err;
315
316 if (xa && !pkcs7_bio_add_digest(&out, xa, p7_ctx))
317 goto err;
318
319 if (evp_cipher != NULL) {
320 unsigned char key[EVP_MAX_KEY_LENGTH];
321 unsigned char iv[EVP_MAX_IV_LENGTH];
322 int keylen, ivlen;
323 EVP_CIPHER_CTX *ctx;
324
325 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
326 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
327 goto err;
328 }
329 BIO_get_cipher_ctx(btmp, &ctx);
330 keylen = EVP_CIPHER_get_key_length(evp_cipher);
331 ivlen = EVP_CIPHER_get_iv_length(evp_cipher);
332 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_get_type(evp_cipher));
333 if (ivlen > 0)
334 if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
335 goto err;
336
337 (void)ERR_set_mark();
338 fetched_cipher = EVP_CIPHER_fetch(libctx,
339 EVP_CIPHER_get0_name(evp_cipher),
340 propq);
341 (void)ERR_pop_to_mark();
342 if (fetched_cipher != NULL)
343 cipher = fetched_cipher;
344 else
345 cipher = evp_cipher;
346
347 if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, 1) <= 0)
348 goto err;
349
350 EVP_CIPHER_free(fetched_cipher);
351 fetched_cipher = NULL;
352
353 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
354 goto err;
355 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
356 goto err;
357
358 if (ivlen > 0) {
359 if (xalg->parameter == NULL) {
360 xalg->parameter = ASN1_TYPE_new();
361 if (xalg->parameter == NULL)
362 goto err;
363 }
364 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) <= 0) {
365 ASN1_TYPE_free(xalg->parameter);
366 xalg->parameter = NULL;
367 goto err;
368 }
369 }
370
371 /* Lets do the pub key stuff :-) */
372 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
373 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
374 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
375 goto err;
376 }
377 OPENSSL_cleanse(key, keylen);
378
379 if (out == NULL)
380 out = btmp;
381 else
382 BIO_push(out, btmp);
383 btmp = NULL;
384 }
385
386 if (bio == NULL) {
387 if (PKCS7_is_detached(p7)) {
388 bio = BIO_new(BIO_s_null());
389 } else if (os != NULL && os->length > 0) {
390 /*
391 * bio needs a copy of os->data instead of a pointer because
392 * the data will be used after os has been freed
393 */
394 bio = BIO_new(BIO_s_mem());
395 if (bio != NULL) {
396 BIO_set_mem_eof_return(bio, 0);
397 if (BIO_write(bio, os->data, os->length) != os->length) {
398 BIO_free_all(bio);
399 bio = NULL;
400 }
401 }
402 } else {
403 bio = BIO_new(BIO_s_mem());
404 if (bio == NULL)
405 goto err;
406 BIO_set_mem_eof_return(bio, 0);
407 }
408 if (bio == NULL)
409 goto err;
410 }
411 if (out)
412 BIO_push(out, bio);
413 else
414 out = bio;
415
416 ASN1_OCTET_STRING_free(os);
417 return out;
418
419 err:
420 ASN1_OCTET_STRING_free(os);
421 EVP_CIPHER_free(fetched_cipher);
422 BIO_free_all(out);
423 BIO_free_all(btmp);
424 return NULL;
425 }
426
pkcs7_cmp_ri(PKCS7_RECIP_INFO * ri,X509 * pcert)427 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
428 {
429 int ret;
430 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
431 X509_get_issuer_name(pcert));
432 if (ret)
433 return ret;
434 return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
435 ri->issuer_and_serial->serial);
436 }
437
438 /* int */
PKCS7_dataDecode(PKCS7 * p7,EVP_PKEY * pkey,BIO * in_bio,X509 * pcert)439 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
440 {
441 int i, len;
442 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
443 X509_ALGOR *xa;
444 ASN1_OCTET_STRING *data_body = NULL;
445 EVP_MD *evp_md = NULL;
446 const EVP_MD *md;
447 EVP_CIPHER *evp_cipher = NULL;
448 const EVP_CIPHER *cipher = NULL;
449 EVP_CIPHER_CTX *evp_ctx = NULL;
450 X509_ALGOR *enc_alg = NULL;
451 STACK_OF(X509_ALGOR) *md_sk = NULL;
452 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
453 PKCS7_RECIP_INFO *ri = NULL;
454 unsigned char *ek = NULL, *tkey = NULL;
455 int eklen = 0, tkeylen = 0;
456 char name[OSSL_MAX_NAME_SIZE];
457 const PKCS7_CTX *p7_ctx;
458 OSSL_LIB_CTX *libctx;
459 const char *propq;
460
461 if (p7 == NULL) {
462 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
463 return NULL;
464 }
465
466 p7_ctx = ossl_pkcs7_get0_ctx(p7);
467 libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
468 propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
469
470 if (p7->d.ptr == NULL) {
471 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
472 return NULL;
473 }
474
475 i = OBJ_obj2nid(p7->type);
476 p7->state = PKCS7_S_HEADER;
477
478 switch (i) {
479 case NID_pkcs7_signed:
480 /*
481 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
482 * field and optional content.
483 * data_body is NULL if that structure has no (=detached) content
484 * or if the contentType is wrong (i.e., not "data").
485 */
486 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
487 if (!PKCS7_is_detached(p7) && data_body == NULL) {
488 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_SIGNED_DATA_TYPE);
489 goto err;
490 }
491 md_sk = p7->d.sign->md_algs;
492 break;
493 case NID_pkcs7_signedAndEnveloped:
494 rsk = p7->d.signed_and_enveloped->recipientinfo;
495 md_sk = p7->d.signed_and_enveloped->md_algs;
496 /* data_body is NULL if the optional EncryptedContent is missing. */
497 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
498 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
499
500 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
501
502 (void)ERR_set_mark();
503 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
504 if (evp_cipher != NULL)
505 cipher = evp_cipher;
506 else
507 cipher = EVP_get_cipherbyname(name);
508
509 if (cipher == NULL) {
510 (void)ERR_clear_last_mark();
511 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
512 goto err;
513 }
514 (void)ERR_pop_to_mark();
515 break;
516 case NID_pkcs7_enveloped:
517 rsk = p7->d.enveloped->recipientinfo;
518 enc_alg = p7->d.enveloped->enc_data->algorithm;
519 /* data_body is NULL if the optional EncryptedContent is missing. */
520 data_body = p7->d.enveloped->enc_data->enc_data;
521 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
522
523 (void)ERR_set_mark();
524 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
525 if (evp_cipher != NULL)
526 cipher = evp_cipher;
527 else
528 cipher = EVP_get_cipherbyname(name);
529
530 if (cipher == NULL) {
531 (void)ERR_clear_last_mark();
532 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
533 goto err;
534 }
535 (void)ERR_pop_to_mark();
536 break;
537 default:
538 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
539 goto err;
540 }
541
542 /* Detached content must be supplied via in_bio instead. */
543 if (data_body == NULL && in_bio == NULL) {
544 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
545 goto err;
546 }
547
548 /* We will be checking the signature */
549 if (md_sk != NULL) {
550 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
551 xa = sk_X509_ALGOR_value(md_sk, i);
552 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
553 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
554 goto err;
555 }
556
557 OBJ_obj2txt(name, sizeof(name), xa->algorithm, 0);
558
559 (void)ERR_set_mark();
560 evp_md = EVP_MD_fetch(libctx, name, propq);
561 if (evp_md != NULL)
562 md = evp_md;
563 else
564 md = EVP_get_digestbyname(name);
565
566 if (md == NULL) {
567 (void)ERR_clear_last_mark();
568 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
569 goto err;
570 }
571 (void)ERR_pop_to_mark();
572
573 if (BIO_set_md(btmp, md) <= 0) {
574 EVP_MD_free(evp_md);
575 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
576 goto err;
577 }
578 EVP_MD_free(evp_md);
579 if (out == NULL)
580 out = btmp;
581 else
582 BIO_push(out, btmp);
583 btmp = NULL;
584 }
585 }
586
587 if (cipher != NULL) {
588 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
589 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
590 goto err;
591 }
592
593 /*
594 * It was encrypted, we need to decrypt the secret key with the
595 * private key
596 */
597
598 /*
599 * Find the recipientInfo which matches the passed certificate (if
600 * any)
601 */
602
603 if (pcert) {
604 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
605 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
606 if (!pkcs7_cmp_ri(ri, pcert))
607 break;
608 ri = NULL;
609 }
610 if (ri == NULL) {
611 ERR_raise(ERR_LIB_PKCS7,
612 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
613 goto err;
614 }
615 }
616
617 /* If we haven't got a certificate try each ri in turn */
618 if (pcert == NULL) {
619 /*
620 * Always attempt to decrypt all rinfo even after success as a
621 * defence against MMA timing attacks.
622 */
623 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
624 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
625 ri->ctx = p7_ctx;
626 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
627 EVP_CIPHER_get_key_length(cipher)) < 0)
628 goto err;
629 ERR_clear_error();
630 }
631 } else {
632 ri->ctx = p7_ctx;
633 /* Only exit on fatal errors, not decrypt failure */
634 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
635 goto err;
636 ERR_clear_error();
637 }
638
639 evp_ctx = NULL;
640 BIO_get_cipher_ctx(etmp, &evp_ctx);
641 if (EVP_CipherInit_ex(evp_ctx, cipher, NULL, NULL, NULL, 0) <= 0)
642 goto err;
643 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) <= 0)
644 goto err;
645 /* Generate random key as MMA defence */
646 len = EVP_CIPHER_CTX_get_key_length(evp_ctx);
647 if (len <= 0)
648 goto err;
649 tkeylen = (size_t)len;
650 tkey = OPENSSL_malloc(tkeylen);
651 if (tkey == NULL)
652 goto err;
653 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
654 goto err;
655 if (ek == NULL) {
656 ek = tkey;
657 eklen = tkeylen;
658 tkey = NULL;
659 }
660
661 if (eklen != EVP_CIPHER_CTX_get_key_length(evp_ctx)) {
662 /*
663 * Some S/MIME clients don't use the same key and effective key
664 * length. The key length is determined by the size of the
665 * decrypted RSA key.
666 */
667 if (EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen) <= 0) {
668 /* Use random key as MMA defence */
669 OPENSSL_clear_free(ek, eklen);
670 ek = tkey;
671 eklen = tkeylen;
672 tkey = NULL;
673 }
674 }
675 /* Clear errors so we don't leak information useful in MMA */
676 ERR_clear_error();
677 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
678 goto err;
679
680 OPENSSL_clear_free(ek, eklen);
681 ek = NULL;
682 OPENSSL_clear_free(tkey, tkeylen);
683 tkey = NULL;
684
685 if (out == NULL)
686 out = etmp;
687 else
688 BIO_push(out, etmp);
689 etmp = NULL;
690 }
691 if (in_bio != NULL) {
692 bio = in_bio;
693 } else {
694 if (data_body->length > 0)
695 bio = BIO_new_mem_buf(data_body->data, data_body->length);
696 else {
697 bio = BIO_new(BIO_s_mem());
698 if (bio == NULL)
699 goto err;
700 BIO_set_mem_eof_return(bio, 0);
701 }
702 if (bio == NULL)
703 goto err;
704 }
705 BIO_push(out, bio);
706 bio = NULL;
707 EVP_CIPHER_free(evp_cipher);
708 return out;
709
710 err:
711 EVP_CIPHER_free(evp_cipher);
712 OPENSSL_clear_free(ek, eklen);
713 OPENSSL_clear_free(tkey, tkeylen);
714 BIO_free_all(out);
715 BIO_free_all(btmp);
716 BIO_free_all(etmp);
717 BIO_free_all(bio);
718 return NULL;
719 }
720
PKCS7_find_digest(EVP_MD_CTX ** pmd,BIO * bio,int nid)721 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
722 {
723 for (;;) {
724 bio = BIO_find_type(bio, BIO_TYPE_MD);
725 if (bio == NULL) {
726 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
727 return NULL;
728 }
729 BIO_get_md_ctx(bio, pmd);
730 if (*pmd == NULL) {
731 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
732 return NULL;
733 }
734 if (EVP_MD_CTX_get_type(*pmd) == nid)
735 return bio;
736 bio = BIO_next(bio);
737 }
738 return NULL;
739 }
740
do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO * si,EVP_MD_CTX * mctx)741 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
742 {
743 unsigned char md_data[EVP_MAX_MD_SIZE];
744 unsigned int md_len;
745
746 /* Add signing time if not already present */
747 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
748 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
749 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
750 return 0;
751 }
752 }
753
754 /* Add digest */
755 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
756 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
757 return 0;
758 }
759 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
760 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
761 return 0;
762 }
763
764 /* Now sign the attributes */
765 if (!PKCS7_SIGNER_INFO_sign(si))
766 return 0;
767
768 return 1;
769 }
770
PKCS7_dataFinal(PKCS7 * p7,BIO * bio)771 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
772 {
773 int ret = 0;
774 int i, j;
775 BIO *btmp;
776 PKCS7_SIGNER_INFO *si;
777 EVP_MD_CTX *mdc, *ctx_tmp;
778 STACK_OF(X509_ATTRIBUTE) *sk;
779 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
780 ASN1_OCTET_STRING *os = NULL;
781 const PKCS7_CTX *p7_ctx;
782
783 if (p7 == NULL) {
784 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
785 return 0;
786 }
787
788 p7_ctx = ossl_pkcs7_get0_ctx(p7);
789
790 if (p7->d.ptr == NULL) {
791 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
792 return 0;
793 }
794
795 ctx_tmp = EVP_MD_CTX_new();
796 if (ctx_tmp == NULL) {
797 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
798 return 0;
799 }
800
801 i = OBJ_obj2nid(p7->type);
802 p7->state = PKCS7_S_HEADER;
803
804 switch (i) {
805 case NID_pkcs7_data:
806 os = p7->d.data;
807 break;
808 case NID_pkcs7_signedAndEnveloped:
809 /* XXXXXXXXXXXXXXXX */
810 si_sk = p7->d.signed_and_enveloped->signer_info;
811 os = p7->d.signed_and_enveloped->enc_data->enc_data;
812 if (os == NULL) {
813 os = ASN1_OCTET_STRING_new();
814 if (os == NULL) {
815 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
816 goto err;
817 }
818 p7->d.signed_and_enveloped->enc_data->enc_data = os;
819 }
820 break;
821 case NID_pkcs7_enveloped:
822 /* XXXXXXXXXXXXXXXX */
823 os = p7->d.enveloped->enc_data->enc_data;
824 if (os == NULL) {
825 os = ASN1_OCTET_STRING_new();
826 if (os == NULL) {
827 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
828 goto err;
829 }
830 p7->d.enveloped->enc_data->enc_data = os;
831 }
832 break;
833 case NID_pkcs7_signed:
834 si_sk = p7->d.sign->signer_info;
835 os = PKCS7_get_octet_string(p7->d.sign->contents);
836 /* If detached data then the content is excluded */
837 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
838 ASN1_OCTET_STRING_free(os);
839 os = NULL;
840 p7->d.sign->contents->d.data = NULL;
841 }
842 break;
843
844 case NID_pkcs7_digest:
845 os = PKCS7_get_octet_string(p7->d.digest->contents);
846 /* If detached data then the content is excluded */
847 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
848 ASN1_OCTET_STRING_free(os);
849 os = NULL;
850 p7->d.digest->contents->d.data = NULL;
851 }
852 break;
853
854 default:
855 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
856 goto err;
857 }
858
859 if (si_sk != NULL) {
860 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
861 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
862 if (si->pkey == NULL)
863 continue;
864
865 j = OBJ_obj2nid(si->digest_alg->algorithm);
866
867 btmp = bio;
868
869 btmp = PKCS7_find_digest(&mdc, btmp, j);
870
871 if (btmp == NULL)
872 goto err;
873
874 /*
875 * We now have the EVP_MD_CTX, lets do the signing.
876 */
877 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
878 goto err;
879
880 sk = si->auth_attr;
881
882 /*
883 * If there are attributes, we add the digest attribute and only
884 * sign the attributes
885 */
886 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
887 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
888 goto err;
889 } else {
890 unsigned char *abuf = NULL;
891 unsigned int abuflen = EVP_PKEY_get_size(si->pkey);
892
893 if (abuflen == 0 || (abuf = OPENSSL_malloc(abuflen)) == NULL)
894 goto err;
895
896 if (!EVP_SignFinal_ex(ctx_tmp, abuf, &abuflen, si->pkey,
897 ossl_pkcs7_ctx_get0_libctx(p7_ctx),
898 ossl_pkcs7_ctx_get0_propq(p7_ctx))) {
899 OPENSSL_free(abuf);
900 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
901 goto err;
902 }
903 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
904 }
905 }
906 } else if (i == NID_pkcs7_digest) {
907 unsigned char md_data[EVP_MAX_MD_SIZE];
908 unsigned int md_len;
909 if (!PKCS7_find_digest(&mdc, bio,
910 OBJ_obj2nid(p7->d.digest->md->algorithm)))
911 goto err;
912 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
913 goto err;
914 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
915 goto err;
916 }
917
918 if (!PKCS7_is_detached(p7)) {
919 /*
920 * NOTE(emilia): I think we only reach os == NULL here because detached
921 * digested data support is broken.
922 */
923 if (os == NULL)
924 goto err;
925 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
926 char *cont;
927 long contlen;
928 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
929 if (btmp == NULL) {
930 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
931 goto err;
932 }
933 contlen = BIO_get_mem_data(btmp, &cont);
934 /*
935 * Mark the BIO read only then we can use its copy of the data
936 * instead of making an extra copy.
937 */
938 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
939 BIO_set_mem_eof_return(btmp, 0);
940 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
941 }
942 }
943 ret = 1;
944 err:
945 EVP_MD_CTX_free(ctx_tmp);
946 return ret;
947 }
948
PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO * si)949 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
950 {
951 EVP_MD_CTX *mctx;
952 EVP_PKEY_CTX *pctx = NULL;
953 unsigned char *abuf = NULL;
954 int alen;
955 size_t siglen;
956 const EVP_MD *md = NULL;
957 const PKCS7_CTX *ctx = si->ctx;
958
959 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
960 if (md == NULL)
961 return 0;
962
963 mctx = EVP_MD_CTX_new();
964 if (mctx == NULL) {
965 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
966 goto err;
967 }
968
969 if (EVP_DigestSignInit_ex(mctx, &pctx, EVP_MD_get0_name(md),
970 ossl_pkcs7_ctx_get0_libctx(ctx),
971 ossl_pkcs7_ctx_get0_propq(ctx), si->pkey,
972 NULL) <= 0)
973 goto err;
974
975 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
976 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
977 if (alen < 0 || abuf == NULL)
978 goto err;
979 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
980 goto err;
981 OPENSSL_free(abuf);
982 abuf = NULL;
983 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
984 goto err;
985 abuf = OPENSSL_malloc(siglen);
986 if (abuf == NULL)
987 goto err;
988 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
989 goto err;
990
991 EVP_MD_CTX_free(mctx);
992
993 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
994
995 return 1;
996
997 err:
998 OPENSSL_free(abuf);
999 EVP_MD_CTX_free(mctx);
1000 return 0;
1001 }
1002
1003 /* This partly overlaps with PKCS7_verify(). It does not support flags. */
PKCS7_dataVerify(X509_STORE * cert_store,X509_STORE_CTX * ctx,BIO * bio,PKCS7 * p7,PKCS7_SIGNER_INFO * si)1004 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
1005 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
1006 {
1007 PKCS7_ISSUER_AND_SERIAL *ias;
1008 int ret = 0, i;
1009 STACK_OF(X509) *untrusted;
1010 STACK_OF(X509_CRL) *crls;
1011 X509 *signer;
1012
1013 if (p7 == NULL) {
1014 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
1015 return 0;
1016 }
1017
1018 if (p7->d.ptr == NULL) {
1019 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
1020 return 0;
1021 }
1022
1023 if (PKCS7_type_is_signed(p7)) {
1024 untrusted = p7->d.sign->cert;
1025 crls = p7->d.sign->crl;
1026 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
1027 untrusted = p7->d.signed_and_enveloped->cert;
1028 crls = p7->d.signed_and_enveloped->crl;
1029 } else {
1030 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
1031 goto err;
1032 }
1033 X509_STORE_CTX_set0_crls(ctx, crls);
1034
1035 /* XXXXXXXXXXXXXXXXXXXXXXX */
1036 ias = si->issuer_and_serial;
1037
1038 signer = X509_find_by_issuer_and_serial(untrusted, ias->issuer, ias->serial);
1039
1040 /* Were we able to find the signer certificate in passed to us? */
1041 if (signer == NULL) {
1042 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
1043 goto err;
1044 }
1045
1046 /* Lets verify */
1047 if (!X509_STORE_CTX_init(ctx, cert_store, signer, untrusted)) {
1048 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
1049 goto err;
1050 }
1051 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1052 i = X509_verify_cert(ctx);
1053 if (i <= 0) {
1054 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
1055 goto err;
1056 }
1057
1058 return PKCS7_signatureVerify(bio, p7, si, signer);
1059 err:
1060 return ret;
1061 }
1062
PKCS7_signatureVerify(BIO * bio,PKCS7 * p7,PKCS7_SIGNER_INFO * si,X509 * signer)1063 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1064 X509 *signer)
1065 {
1066 ASN1_OCTET_STRING *os;
1067 EVP_MD_CTX *mdc_tmp, *mdc;
1068 const EVP_MD *md;
1069 EVP_MD *fetched_md = NULL;
1070 int ret = 0, i;
1071 int md_type;
1072 STACK_OF(X509_ATTRIBUTE) *sk;
1073 BIO *btmp;
1074 EVP_PKEY *pkey;
1075 unsigned char *abuf = NULL;
1076 const PKCS7_CTX *ctx = ossl_pkcs7_get0_ctx(p7);
1077 OSSL_LIB_CTX *libctx = ossl_pkcs7_ctx_get0_libctx(ctx);
1078 const char *propq = ossl_pkcs7_ctx_get0_propq(ctx);
1079
1080 mdc_tmp = EVP_MD_CTX_new();
1081 if (mdc_tmp == NULL) {
1082 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
1083 goto err;
1084 }
1085
1086 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1087 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
1088 goto err;
1089 }
1090
1091 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1092
1093 btmp = bio;
1094 for (;;) {
1095 if ((btmp == NULL) ||
1096 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1097 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1098 goto err;
1099 }
1100 BIO_get_md_ctx(btmp, &mdc);
1101 if (mdc == NULL) {
1102 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
1103 goto err;
1104 }
1105 if (EVP_MD_CTX_get_type(mdc) == md_type)
1106 break;
1107 /*
1108 * Workaround for some broken clients that put the signature OID
1109 * instead of the digest OID in digest_alg->algorithm
1110 */
1111 if (EVP_MD_get_pkey_type(EVP_MD_CTX_get0_md(mdc)) == md_type)
1112 break;
1113 btmp = BIO_next(btmp);
1114 }
1115
1116 /*
1117 * mdc is the digest ctx that we want, unless there are attributes, in
1118 * which case the digest is the signed attributes
1119 */
1120 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1121 goto err;
1122
1123 sk = si->auth_attr;
1124 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1125 unsigned char md_dat[EVP_MAX_MD_SIZE];
1126 unsigned int md_len;
1127 int alen;
1128 ASN1_OCTET_STRING *message_digest;
1129
1130 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1131 goto err;
1132 message_digest = PKCS7_digest_from_attributes(sk);
1133 if (!message_digest) {
1134 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1135 goto err;
1136 }
1137 if ((message_digest->length != (int)md_len) ||
1138 (memcmp(message_digest->data, md_dat, md_len))) {
1139 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DIGEST_FAILURE);
1140 ret = -1;
1141 goto err;
1142 }
1143
1144 (void)ERR_set_mark();
1145 fetched_md = EVP_MD_fetch(libctx, OBJ_nid2sn(md_type), propq);
1146
1147 if (fetched_md != NULL)
1148 md = fetched_md;
1149 else
1150 md = EVP_get_digestbynid(md_type);
1151
1152 if (md == NULL || !EVP_VerifyInit_ex(mdc_tmp, md, NULL)) {
1153 (void)ERR_clear_last_mark();
1154 goto err;
1155 }
1156 (void)ERR_pop_to_mark();
1157
1158 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1159 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1160 if (alen <= 0 || abuf == NULL) {
1161 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
1162 ret = -1;
1163 goto err;
1164 }
1165 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1166 goto err;
1167 }
1168
1169 os = si->enc_digest;
1170 pkey = X509_get0_pubkey(signer);
1171 if (pkey == NULL) {
1172 ret = -1;
1173 goto err;
1174 }
1175
1176 i = EVP_VerifyFinal_ex(mdc_tmp, os->data, os->length, pkey, libctx, propq);
1177 if (i <= 0) {
1178 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
1179 ret = -1;
1180 goto err;
1181 }
1182 ret = 1;
1183 err:
1184 OPENSSL_free(abuf);
1185 EVP_MD_CTX_free(mdc_tmp);
1186 EVP_MD_free(fetched_md);
1187 return ret;
1188 }
1189
PKCS7_get_issuer_and_serial(PKCS7 * p7,int idx)1190 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1191 {
1192 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1193 PKCS7_RECIP_INFO *ri;
1194 int i;
1195
1196 i = OBJ_obj2nid(p7->type);
1197 if (i != NID_pkcs7_signedAndEnveloped)
1198 return NULL;
1199 if (p7->d.signed_and_enveloped == NULL)
1200 return NULL;
1201 rsk = p7->d.signed_and_enveloped->recipientinfo;
1202 if (rsk == NULL)
1203 return NULL;
1204 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1205 return NULL;
1206 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1207 return ri->issuer_and_serial;
1208 }
1209
PKCS7_get_signed_attribute(const PKCS7_SIGNER_INFO * si,int nid)1210 ASN1_TYPE *PKCS7_get_signed_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1211 {
1212 return get_attribute(si->auth_attr, nid);
1213 }
1214
PKCS7_get_attribute(const PKCS7_SIGNER_INFO * si,int nid)1215 ASN1_TYPE *PKCS7_get_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1216 {
1217 return get_attribute(si->unauth_attr, nid);
1218 }
1219
get_attribute(const STACK_OF (X509_ATTRIBUTE)* sk,int nid)1220 static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1221 {
1222 int idx = X509at_get_attr_by_NID(sk, nid, -1);
1223
1224 if (idx < 0)
1225 return NULL;
1226 return X509_ATTRIBUTE_get0_type(X509at_get_attr(sk, idx), 0);
1227 }
1228
PKCS7_digest_from_attributes(STACK_OF (X509_ATTRIBUTE)* sk)1229 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1230 {
1231 ASN1_TYPE *astype;
1232 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1233 return NULL;
1234 return astype->value.octet_string;
1235 }
1236
PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1237 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1238 STACK_OF(X509_ATTRIBUTE) *sk)
1239 {
1240 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1241 p7si->auth_attr = sk_X509_ATTRIBUTE_deep_copy(sk, X509_ATTRIBUTE_dup, X509_ATTRIBUTE_free);
1242 if (p7si->auth_attr == NULL)
1243 return 0;
1244 return 1;
1245 }
1246
PKCS7_set_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1247 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1248 STACK_OF(X509_ATTRIBUTE) *sk)
1249 {
1250 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1251 p7si->unauth_attr = sk_X509_ATTRIBUTE_deep_copy(sk, X509_ATTRIBUTE_dup, X509_ATTRIBUTE_free);
1252 if (p7si->unauth_attr == NULL)
1253 return 0;
1254 return 1;
1255 }
1256
PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1257 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1258 void *value)
1259 {
1260 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1261 }
1262
PKCS7_add_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1263 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1264 void *value)
1265 {
1266 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1267 }
1268
add_attribute(STACK_OF (X509_ATTRIBUTE)** sk,int nid,int atrtype,void * value)1269 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1270 void *value)
1271 {
1272 X509_ATTRIBUTE *attr = NULL;
1273 int i, n;
1274
1275 if (*sk == NULL) {
1276 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1277 return 0;
1278 }
1279 n = sk_X509_ATTRIBUTE_num(*sk);
1280 for (i = 0; i < n; i++) {
1281 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1282 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid)
1283 goto end;
1284 }
1285 if (!sk_X509_ATTRIBUTE_push(*sk, NULL))
1286 return 0;
1287
1288 end:
1289 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1290 if (attr == NULL) {
1291 if (i == n)
1292 sk_X509_ATTRIBUTE_pop(*sk);
1293 return 0;
1294 }
1295 X509_ATTRIBUTE_free(sk_X509_ATTRIBUTE_value(*sk, i));
1296 (void) sk_X509_ATTRIBUTE_set(*sk, i, attr);
1297 return 1;
1298 }
1299