1 /*
2 * Copyright 1995-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include <openssl/rand.h>
12 #include <openssl/objects.h>
13 #include <openssl/x509.h>
14 #include <openssl/x509v3.h>
15 #include <openssl/err.h>
16 #include "internal/cryptlib.h"
17 #include "internal/sizes.h"
18 #include "crypto/evp.h"
19 #include "pk7_local.h"
20
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 goto err;
366 }
367
368 /* Lets do the pub key stuff :-) */
369 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
370 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
371 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
372 goto err;
373 }
374 OPENSSL_cleanse(key, keylen);
375
376 if (out == NULL)
377 out = btmp;
378 else
379 BIO_push(out, btmp);
380 btmp = NULL;
381 }
382
383 if (bio == NULL) {
384 if (PKCS7_is_detached(p7)) {
385 bio = BIO_new(BIO_s_null());
386 } else if (os != NULL && os->length > 0) {
387 /*
388 * bio needs a copy of os->data instead of a pointer because
389 * the data will be used after os has been freed
390 */
391 bio = BIO_new(BIO_s_mem());
392 if (bio != NULL) {
393 BIO_set_mem_eof_return(bio, 0);
394 if (BIO_write(bio, os->data, os->length) != os->length) {
395 BIO_free_all(bio);
396 bio = NULL;
397 }
398 }
399 } else {
400 bio = BIO_new(BIO_s_mem());
401 if (bio == NULL)
402 goto err;
403 BIO_set_mem_eof_return(bio, 0);
404 }
405 if (bio == NULL)
406 goto err;
407 }
408 if (out)
409 BIO_push(out, bio);
410 else
411 out = bio;
412
413 ASN1_OCTET_STRING_free(os);
414 return out;
415
416 err:
417 ASN1_OCTET_STRING_free(os);
418 EVP_CIPHER_free(fetched_cipher);
419 BIO_free_all(out);
420 BIO_free_all(btmp);
421 return NULL;
422 }
423
pkcs7_cmp_ri(PKCS7_RECIP_INFO * ri,X509 * pcert)424 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
425 {
426 int ret;
427 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
428 X509_get_issuer_name(pcert));
429 if (ret)
430 return ret;
431 return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
432 ri->issuer_and_serial->serial);
433 }
434
435 /* int */
PKCS7_dataDecode(PKCS7 * p7,EVP_PKEY * pkey,BIO * in_bio,X509 * pcert)436 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
437 {
438 int i, len;
439 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
440 X509_ALGOR *xa;
441 ASN1_OCTET_STRING *data_body = NULL;
442 EVP_MD *evp_md = NULL;
443 const EVP_MD *md;
444 EVP_CIPHER *evp_cipher = NULL;
445 const EVP_CIPHER *cipher = NULL;
446 EVP_CIPHER_CTX *evp_ctx = NULL;
447 X509_ALGOR *enc_alg = NULL;
448 STACK_OF(X509_ALGOR) *md_sk = NULL;
449 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
450 PKCS7_RECIP_INFO *ri = NULL;
451 unsigned char *ek = NULL, *tkey = NULL;
452 int eklen = 0, tkeylen = 0;
453 char name[OSSL_MAX_NAME_SIZE];
454 const PKCS7_CTX *p7_ctx;
455 OSSL_LIB_CTX *libctx;
456 const char *propq;
457
458 if (p7 == NULL) {
459 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
460 return NULL;
461 }
462
463 p7_ctx = ossl_pkcs7_get0_ctx(p7);
464 libctx = ossl_pkcs7_ctx_get0_libctx(p7_ctx);
465 propq = ossl_pkcs7_ctx_get0_propq(p7_ctx);
466
467 if (p7->d.ptr == NULL) {
468 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
469 return NULL;
470 }
471
472 i = OBJ_obj2nid(p7->type);
473 p7->state = PKCS7_S_HEADER;
474
475 switch (i) {
476 case NID_pkcs7_signed:
477 /*
478 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
479 * field and optional content.
480 * data_body is NULL if that structure has no (=detached) content
481 * or if the contentType is wrong (i.e., not "data").
482 */
483 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
484 if (!PKCS7_is_detached(p7) && data_body == NULL) {
485 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_SIGNED_DATA_TYPE);
486 goto err;
487 }
488 md_sk = p7->d.sign->md_algs;
489 break;
490 case NID_pkcs7_signedAndEnveloped:
491 rsk = p7->d.signed_and_enveloped->recipientinfo;
492 md_sk = p7->d.signed_and_enveloped->md_algs;
493 /* data_body is NULL if the optional EncryptedContent is missing. */
494 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
495 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
496
497 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
498
499 (void)ERR_set_mark();
500 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
501 if (evp_cipher != NULL)
502 cipher = evp_cipher;
503 else
504 cipher = EVP_get_cipherbyname(name);
505
506 if (cipher == NULL) {
507 (void)ERR_clear_last_mark();
508 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
509 goto err;
510 }
511 (void)ERR_pop_to_mark();
512 break;
513 case NID_pkcs7_enveloped:
514 rsk = p7->d.enveloped->recipientinfo;
515 enc_alg = p7->d.enveloped->enc_data->algorithm;
516 /* data_body is NULL if the optional EncryptedContent is missing. */
517 data_body = p7->d.enveloped->enc_data->enc_data;
518 OBJ_obj2txt(name, sizeof(name), enc_alg->algorithm, 0);
519
520 (void)ERR_set_mark();
521 evp_cipher = EVP_CIPHER_fetch(libctx, name, propq);
522 if (evp_cipher != NULL)
523 cipher = evp_cipher;
524 else
525 cipher = EVP_get_cipherbyname(name);
526
527 if (cipher == NULL) {
528 (void)ERR_clear_last_mark();
529 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
530 goto err;
531 }
532 (void)ERR_pop_to_mark();
533 break;
534 default:
535 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
536 goto err;
537 }
538
539 /* Detached content must be supplied via in_bio instead. */
540 if (data_body == NULL && in_bio == NULL) {
541 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
542 goto err;
543 }
544
545 /* We will be checking the signature */
546 if (md_sk != NULL) {
547 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
548 xa = sk_X509_ALGOR_value(md_sk, i);
549 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
550 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
551 goto err;
552 }
553
554 OBJ_obj2txt(name, sizeof(name), xa->algorithm, 0);
555
556 (void)ERR_set_mark();
557 evp_md = EVP_MD_fetch(libctx, name, propq);
558 if (evp_md != NULL)
559 md = evp_md;
560 else
561 md = EVP_get_digestbyname(name);
562
563 if (md == NULL) {
564 (void)ERR_clear_last_mark();
565 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNKNOWN_DIGEST_TYPE);
566 goto err;
567 }
568 (void)ERR_pop_to_mark();
569
570 if (BIO_set_md(btmp, md) <= 0) {
571 EVP_MD_free(evp_md);
572 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
573 goto err;
574 }
575 EVP_MD_free(evp_md);
576 if (out == NULL)
577 out = btmp;
578 else
579 BIO_push(out, btmp);
580 btmp = NULL;
581 }
582 }
583
584 if (cipher != NULL) {
585 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
586 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
587 goto err;
588 }
589
590 /*
591 * It was encrypted, we need to decrypt the secret key with the
592 * private key
593 */
594
595 /*
596 * Find the recipientInfo which matches the passed certificate (if
597 * any)
598 */
599
600 if (pcert) {
601 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
602 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
603 if (!pkcs7_cmp_ri(ri, pcert))
604 break;
605 ri = NULL;
606 }
607 if (ri == NULL) {
608 ERR_raise(ERR_LIB_PKCS7,
609 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
610 goto err;
611 }
612 }
613
614 /* If we haven't got a certificate try each ri in turn */
615 if (pcert == NULL) {
616 /*
617 * Always attempt to decrypt all rinfo even after success as a
618 * defence against MMA timing attacks.
619 */
620 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
621 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
622 ri->ctx = p7_ctx;
623 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
624 EVP_CIPHER_get_key_length(cipher)) < 0)
625 goto err;
626 ERR_clear_error();
627 }
628 } else {
629 ri->ctx = p7_ctx;
630 /* Only exit on fatal errors, not decrypt failure */
631 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
632 goto err;
633 ERR_clear_error();
634 }
635
636 evp_ctx = NULL;
637 BIO_get_cipher_ctx(etmp, &evp_ctx);
638 if (EVP_CipherInit_ex(evp_ctx, cipher, NULL, NULL, NULL, 0) <= 0)
639 goto err;
640 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) <= 0)
641 goto err;
642 /* Generate random key as MMA defence */
643 len = EVP_CIPHER_CTX_get_key_length(evp_ctx);
644 if (len <= 0)
645 goto err;
646 tkeylen = (size_t)len;
647 tkey = OPENSSL_malloc(tkeylen);
648 if (tkey == NULL)
649 goto err;
650 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
651 goto err;
652 if (ek == NULL) {
653 ek = tkey;
654 eklen = tkeylen;
655 tkey = NULL;
656 }
657
658 if (eklen != EVP_CIPHER_CTX_get_key_length(evp_ctx)) {
659 /*
660 * Some S/MIME clients don't use the same key and effective key
661 * length. The key length is determined by the size of the
662 * decrypted RSA key.
663 */
664 if (EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen) <= 0) {
665 /* Use random key as MMA defence */
666 OPENSSL_clear_free(ek, eklen);
667 ek = tkey;
668 eklen = tkeylen;
669 tkey = NULL;
670 }
671 }
672 /* Clear errors so we don't leak information useful in MMA */
673 ERR_clear_error();
674 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
675 goto err;
676
677 OPENSSL_clear_free(ek, eklen);
678 ek = NULL;
679 OPENSSL_clear_free(tkey, tkeylen);
680 tkey = NULL;
681
682 if (out == NULL)
683 out = etmp;
684 else
685 BIO_push(out, etmp);
686 etmp = NULL;
687 }
688 if (in_bio != NULL) {
689 bio = in_bio;
690 } else {
691 if (data_body->length > 0)
692 bio = BIO_new_mem_buf(data_body->data, data_body->length);
693 else {
694 bio = BIO_new(BIO_s_mem());
695 if (bio == NULL)
696 goto err;
697 BIO_set_mem_eof_return(bio, 0);
698 }
699 if (bio == NULL)
700 goto err;
701 }
702 BIO_push(out, bio);
703 bio = NULL;
704 EVP_CIPHER_free(evp_cipher);
705 return out;
706
707 err:
708 EVP_CIPHER_free(evp_cipher);
709 OPENSSL_clear_free(ek, eklen);
710 OPENSSL_clear_free(tkey, tkeylen);
711 BIO_free_all(out);
712 BIO_free_all(btmp);
713 BIO_free_all(etmp);
714 BIO_free_all(bio);
715 return NULL;
716 }
717
PKCS7_find_digest(EVP_MD_CTX ** pmd,BIO * bio,int nid)718 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
719 {
720 for (;;) {
721 bio = BIO_find_type(bio, BIO_TYPE_MD);
722 if (bio == NULL) {
723 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
724 return NULL;
725 }
726 BIO_get_md_ctx(bio, pmd);
727 if (*pmd == NULL) {
728 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
729 return NULL;
730 }
731 if (EVP_MD_CTX_get_type(*pmd) == nid)
732 return bio;
733 bio = BIO_next(bio);
734 }
735 return NULL;
736 }
737
do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO * si,EVP_MD_CTX * mctx)738 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
739 {
740 unsigned char md_data[EVP_MAX_MD_SIZE];
741 unsigned int md_len;
742
743 /* Add signing time if not already present */
744 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
745 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
746 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
747 return 0;
748 }
749 }
750
751 /* Add digest */
752 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
753 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
754 return 0;
755 }
756 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
757 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
758 return 0;
759 }
760
761 /* Now sign the attributes */
762 if (!PKCS7_SIGNER_INFO_sign(si))
763 return 0;
764
765 return 1;
766 }
767
PKCS7_dataFinal(PKCS7 * p7,BIO * bio)768 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
769 {
770 int ret = 0;
771 int i, j;
772 BIO *btmp;
773 PKCS7_SIGNER_INFO *si;
774 EVP_MD_CTX *mdc, *ctx_tmp;
775 STACK_OF(X509_ATTRIBUTE) *sk;
776 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
777 ASN1_OCTET_STRING *os = NULL;
778 const PKCS7_CTX *p7_ctx;
779
780 if (p7 == NULL) {
781 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
782 return 0;
783 }
784
785 p7_ctx = ossl_pkcs7_get0_ctx(p7);
786
787 if (p7->d.ptr == NULL) {
788 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
789 return 0;
790 }
791
792 ctx_tmp = EVP_MD_CTX_new();
793 if (ctx_tmp == NULL) {
794 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
795 return 0;
796 }
797
798 i = OBJ_obj2nid(p7->type);
799 p7->state = PKCS7_S_HEADER;
800
801 switch (i) {
802 case NID_pkcs7_data:
803 os = p7->d.data;
804 break;
805 case NID_pkcs7_signedAndEnveloped:
806 /* XXXXXXXXXXXXXXXX */
807 si_sk = p7->d.signed_and_enveloped->signer_info;
808 os = p7->d.signed_and_enveloped->enc_data->enc_data;
809 if (os == NULL) {
810 os = ASN1_OCTET_STRING_new();
811 if (os == NULL) {
812 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
813 goto err;
814 }
815 p7->d.signed_and_enveloped->enc_data->enc_data = os;
816 }
817 break;
818 case NID_pkcs7_enveloped:
819 /* XXXXXXXXXXXXXXXX */
820 os = p7->d.enveloped->enc_data->enc_data;
821 if (os == NULL) {
822 os = ASN1_OCTET_STRING_new();
823 if (os == NULL) {
824 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
825 goto err;
826 }
827 p7->d.enveloped->enc_data->enc_data = os;
828 }
829 break;
830 case NID_pkcs7_signed:
831 si_sk = p7->d.sign->signer_info;
832 os = PKCS7_get_octet_string(p7->d.sign->contents);
833 /* If detached data then the content is excluded */
834 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
835 ASN1_OCTET_STRING_free(os);
836 os = NULL;
837 p7->d.sign->contents->d.data = NULL;
838 }
839 break;
840
841 case NID_pkcs7_digest:
842 os = PKCS7_get_octet_string(p7->d.digest->contents);
843 /* If detached data then the content is excluded */
844 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
845 ASN1_OCTET_STRING_free(os);
846 os = NULL;
847 p7->d.digest->contents->d.data = NULL;
848 }
849 break;
850
851 default:
852 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
853 goto err;
854 }
855
856 if (si_sk != NULL) {
857 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
858 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
859 if (si->pkey == NULL)
860 continue;
861
862 j = OBJ_obj2nid(si->digest_alg->algorithm);
863
864 btmp = bio;
865
866 btmp = PKCS7_find_digest(&mdc, btmp, j);
867
868 if (btmp == NULL)
869 goto err;
870
871 /*
872 * We now have the EVP_MD_CTX, lets do the signing.
873 */
874 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
875 goto err;
876
877 sk = si->auth_attr;
878
879 /*
880 * If there are attributes, we add the digest attribute and only
881 * sign the attributes
882 */
883 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
884 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
885 goto err;
886 } else {
887 unsigned char *abuf = NULL;
888 unsigned int abuflen = EVP_PKEY_get_size(si->pkey);
889
890 if (abuflen == 0 || (abuf = OPENSSL_malloc(abuflen)) == NULL)
891 goto err;
892
893 if (!EVP_SignFinal_ex(ctx_tmp, abuf, &abuflen, si->pkey,
894 ossl_pkcs7_ctx_get0_libctx(p7_ctx),
895 ossl_pkcs7_ctx_get0_propq(p7_ctx))) {
896 OPENSSL_free(abuf);
897 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
898 goto err;
899 }
900 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
901 }
902 }
903 } else if (i == NID_pkcs7_digest) {
904 unsigned char md_data[EVP_MAX_MD_SIZE];
905 unsigned int md_len;
906 if (!PKCS7_find_digest(&mdc, bio,
907 OBJ_obj2nid(p7->d.digest->md->algorithm)))
908 goto err;
909 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
910 goto err;
911 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
912 goto err;
913 }
914
915 if (!PKCS7_is_detached(p7)) {
916 /*
917 * NOTE(emilia): I think we only reach os == NULL here because detached
918 * digested data support is broken.
919 */
920 if (os == NULL)
921 goto err;
922 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
923 char *cont;
924 long contlen;
925 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
926 if (btmp == NULL) {
927 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
928 goto err;
929 }
930 contlen = BIO_get_mem_data(btmp, &cont);
931 /*
932 * Mark the BIO read only then we can use its copy of the data
933 * instead of making an extra copy.
934 */
935 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
936 BIO_set_mem_eof_return(btmp, 0);
937 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
938 }
939 }
940 ret = 1;
941 err:
942 EVP_MD_CTX_free(ctx_tmp);
943 return ret;
944 }
945
PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO * si)946 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
947 {
948 EVP_MD_CTX *mctx;
949 EVP_PKEY_CTX *pctx = NULL;
950 unsigned char *abuf = NULL;
951 int alen;
952 size_t siglen;
953 const EVP_MD *md = NULL;
954 const PKCS7_CTX *ctx = si->ctx;
955
956 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
957 if (md == NULL)
958 return 0;
959
960 mctx = EVP_MD_CTX_new();
961 if (mctx == NULL) {
962 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
963 goto err;
964 }
965
966 if (EVP_DigestSignInit_ex(mctx, &pctx, EVP_MD_get0_name(md),
967 ossl_pkcs7_ctx_get0_libctx(ctx),
968 ossl_pkcs7_ctx_get0_propq(ctx), si->pkey,
969 NULL) <= 0)
970 goto err;
971
972 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
973 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
974 if (alen < 0 || abuf == NULL)
975 goto err;
976 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
977 goto err;
978 OPENSSL_free(abuf);
979 abuf = NULL;
980 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
981 goto err;
982 abuf = OPENSSL_malloc(siglen);
983 if (abuf == NULL)
984 goto err;
985 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
986 goto err;
987
988 EVP_MD_CTX_free(mctx);
989
990 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
991
992 return 1;
993
994 err:
995 OPENSSL_free(abuf);
996 EVP_MD_CTX_free(mctx);
997 return 0;
998 }
999
1000 /* 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)1001 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
1002 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
1003 {
1004 PKCS7_ISSUER_AND_SERIAL *ias;
1005 int ret = 0, i;
1006 STACK_OF(X509) *untrusted;
1007 STACK_OF(X509_CRL) *crls;
1008 X509 *signer;
1009
1010 if (p7 == NULL) {
1011 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
1012 return 0;
1013 }
1014
1015 if (p7->d.ptr == NULL) {
1016 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
1017 return 0;
1018 }
1019
1020 if (PKCS7_type_is_signed(p7)) {
1021 untrusted = p7->d.sign->cert;
1022 crls = p7->d.sign->crl;
1023 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
1024 untrusted = p7->d.signed_and_enveloped->cert;
1025 crls = p7->d.signed_and_enveloped->crl;
1026 } else {
1027 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
1028 goto err;
1029 }
1030 X509_STORE_CTX_set0_crls(ctx, crls);
1031
1032 /* XXXXXXXXXXXXXXXXXXXXXXX */
1033 ias = si->issuer_and_serial;
1034
1035 signer = X509_find_by_issuer_and_serial(untrusted, ias->issuer, ias->serial);
1036
1037 /* Were we able to find the signer certificate in passed to us? */
1038 if (signer == NULL) {
1039 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
1040 goto err;
1041 }
1042
1043 /* Lets verify */
1044 if (!X509_STORE_CTX_init(ctx, cert_store, signer, untrusted)) {
1045 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
1046 goto err;
1047 }
1048 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1049 i = X509_verify_cert(ctx);
1050 if (i <= 0) {
1051 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
1052 goto err;
1053 }
1054
1055 return PKCS7_signatureVerify(bio, p7, si, signer);
1056 err:
1057 return ret;
1058 }
1059
PKCS7_signatureVerify(BIO * bio,PKCS7 * p7,PKCS7_SIGNER_INFO * si,X509 * signer)1060 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1061 X509 *signer)
1062 {
1063 ASN1_OCTET_STRING *os;
1064 EVP_MD_CTX *mdc_tmp, *mdc;
1065 const EVP_MD *md;
1066 EVP_MD *fetched_md = NULL;
1067 int ret = 0, i;
1068 int md_type;
1069 STACK_OF(X509_ATTRIBUTE) *sk;
1070 BIO *btmp;
1071 EVP_PKEY *pkey;
1072 unsigned char *abuf = NULL;
1073 const PKCS7_CTX *ctx = ossl_pkcs7_get0_ctx(p7);
1074 OSSL_LIB_CTX *libctx = ossl_pkcs7_ctx_get0_libctx(ctx);
1075 const char *propq = ossl_pkcs7_ctx_get0_propq(ctx);
1076
1077 mdc_tmp = EVP_MD_CTX_new();
1078 if (mdc_tmp == NULL) {
1079 ERR_raise(ERR_LIB_PKCS7, ERR_R_EVP_LIB);
1080 goto err;
1081 }
1082
1083 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1084 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_PKCS7_TYPE);
1085 goto err;
1086 }
1087
1088 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1089
1090 btmp = bio;
1091 for (;;) {
1092 if ((btmp == NULL) ||
1093 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1094 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1095 goto err;
1096 }
1097 BIO_get_md_ctx(btmp, &mdc);
1098 if (mdc == NULL) {
1099 ERR_raise(ERR_LIB_PKCS7, ERR_R_INTERNAL_ERROR);
1100 goto err;
1101 }
1102 if (EVP_MD_CTX_get_type(mdc) == md_type)
1103 break;
1104 /*
1105 * Workaround for some broken clients that put the signature OID
1106 * instead of the digest OID in digest_alg->algorithm
1107 */
1108 if (EVP_MD_get_pkey_type(EVP_MD_CTX_get0_md(mdc)) == md_type)
1109 break;
1110 btmp = BIO_next(btmp);
1111 }
1112
1113 /*
1114 * mdc is the digest ctx that we want, unless there are attributes, in
1115 * which case the digest is the signed attributes
1116 */
1117 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1118 goto err;
1119
1120 sk = si->auth_attr;
1121 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1122 unsigned char md_dat[EVP_MAX_MD_SIZE];
1123 unsigned int md_len;
1124 int alen;
1125 ASN1_OCTET_STRING *message_digest;
1126
1127 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1128 goto err;
1129 message_digest = PKCS7_digest_from_attributes(sk);
1130 if (!message_digest) {
1131 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1132 goto err;
1133 }
1134 if ((message_digest->length != (int)md_len) ||
1135 (memcmp(message_digest->data, md_dat, md_len))) {
1136 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DIGEST_FAILURE);
1137 ret = -1;
1138 goto err;
1139 }
1140
1141 (void)ERR_set_mark();
1142 fetched_md = EVP_MD_fetch(libctx, OBJ_nid2sn(md_type), propq);
1143
1144 if (fetched_md != NULL)
1145 md = fetched_md;
1146 else
1147 md = EVP_get_digestbynid(md_type);
1148
1149 if (md == NULL || !EVP_VerifyInit_ex(mdc_tmp, md, NULL)) {
1150 (void)ERR_clear_last_mark();
1151 goto err;
1152 }
1153 (void)ERR_pop_to_mark();
1154
1155 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1156 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1157 if (alen <= 0 || abuf == NULL) {
1158 ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);
1159 ret = -1;
1160 goto err;
1161 }
1162 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1163 goto err;
1164 }
1165
1166 os = si->enc_digest;
1167 pkey = X509_get0_pubkey(signer);
1168 if (pkey == NULL) {
1169 ret = -1;
1170 goto err;
1171 }
1172
1173 i = EVP_VerifyFinal_ex(mdc_tmp, os->data, os->length, pkey, libctx, propq);
1174 if (i <= 0) {
1175 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
1176 ret = -1;
1177 goto err;
1178 }
1179 ret = 1;
1180 err:
1181 OPENSSL_free(abuf);
1182 EVP_MD_CTX_free(mdc_tmp);
1183 EVP_MD_free(fetched_md);
1184 return ret;
1185 }
1186
PKCS7_get_issuer_and_serial(PKCS7 * p7,int idx)1187 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1188 {
1189 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1190 PKCS7_RECIP_INFO *ri;
1191 int i;
1192
1193 i = OBJ_obj2nid(p7->type);
1194 if (i != NID_pkcs7_signedAndEnveloped)
1195 return NULL;
1196 if (p7->d.signed_and_enveloped == NULL)
1197 return NULL;
1198 rsk = p7->d.signed_and_enveloped->recipientinfo;
1199 if (rsk == NULL)
1200 return NULL;
1201 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1202 return NULL;
1203 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1204 return ri->issuer_and_serial;
1205 }
1206
PKCS7_get_signed_attribute(const PKCS7_SIGNER_INFO * si,int nid)1207 ASN1_TYPE *PKCS7_get_signed_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1208 {
1209 return get_attribute(si->auth_attr, nid);
1210 }
1211
PKCS7_get_attribute(const PKCS7_SIGNER_INFO * si,int nid)1212 ASN1_TYPE *PKCS7_get_attribute(const PKCS7_SIGNER_INFO *si, int nid)
1213 {
1214 return get_attribute(si->unauth_attr, nid);
1215 }
1216
get_attribute(const STACK_OF (X509_ATTRIBUTE)* sk,int nid)1217 static ASN1_TYPE *get_attribute(const STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1218 {
1219 int idx = X509at_get_attr_by_NID(sk, nid, -1);
1220
1221 if (idx < 0)
1222 return NULL;
1223 return X509_ATTRIBUTE_get0_type(X509at_get_attr(sk, idx), 0);
1224 }
1225
PKCS7_digest_from_attributes(STACK_OF (X509_ATTRIBUTE)* sk)1226 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1227 {
1228 ASN1_TYPE *astype;
1229 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1230 return NULL;
1231 return astype->value.octet_string;
1232 }
1233
PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1234 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1235 STACK_OF(X509_ATTRIBUTE) *sk)
1236 {
1237 int i;
1238
1239 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1240 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1241 if (p7si->auth_attr == NULL)
1242 return 0;
1243 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1244 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1245 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1246 (sk, i))))
1247 == NULL)
1248 return 0;
1249 }
1250 return 1;
1251 }
1252
PKCS7_set_attributes(PKCS7_SIGNER_INFO * p7si,STACK_OF (X509_ATTRIBUTE)* sk)1253 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1254 STACK_OF(X509_ATTRIBUTE) *sk)
1255 {
1256 int i;
1257
1258 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1259 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1260 if (p7si->unauth_attr == NULL)
1261 return 0;
1262 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1263 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1264 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1265 (sk, i))))
1266 == NULL)
1267 return 0;
1268 }
1269 return 1;
1270 }
1271
PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1272 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1273 void *value)
1274 {
1275 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1276 }
1277
PKCS7_add_attribute(PKCS7_SIGNER_INFO * p7si,int nid,int atrtype,void * value)1278 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1279 void *value)
1280 {
1281 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1282 }
1283
add_attribute(STACK_OF (X509_ATTRIBUTE)** sk,int nid,int atrtype,void * value)1284 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1285 void *value)
1286 {
1287 X509_ATTRIBUTE *attr = NULL;
1288 int i, n;
1289
1290 if (*sk == NULL) {
1291 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1292 return 0;
1293 }
1294 n = sk_X509_ATTRIBUTE_num(*sk);
1295 for (i = 0; i < n; i++) {
1296 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1297 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid)
1298 goto end;
1299 }
1300 if (!sk_X509_ATTRIBUTE_push(*sk, NULL))
1301 return 0;
1302
1303 end:
1304 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1305 if (attr == NULL) {
1306 if (i == n)
1307 sk_X509_ATTRIBUTE_pop(*sk);
1308 return 0;
1309 }
1310 X509_ATTRIBUTE_free(sk_X509_ATTRIBUTE_value(*sk, i));
1311 (void) sk_X509_ATTRIBUTE_set(*sk, i, attr);
1312 return 1;
1313 }
1314
