1 /* crypto/pkcs7/pk7_doit.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
60 #include "internal/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>
67 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
69 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
71 static int PKCS7_type_is_other(PKCS7 *p7)
75 int nid = OBJ_obj2nid(p7->type);
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:
94 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
96 if (PKCS7_type_is_data(p7))
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;
104 static int PKCS7_bio_add_digest(BIO **pbio, X509_ALGOR *alg)
108 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
109 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
113 md = EVP_get_digestbyobj(alg->algorithm);
115 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
119 BIO_set_md(btmp, md);
122 else if (!BIO_push(*pbio, btmp)) {
123 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
136 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
137 unsigned char *key, int keylen)
139 EVP_PKEY_CTX *pctx = NULL;
140 EVP_PKEY *pkey = NULL;
141 unsigned char *ek = NULL;
145 pkey = X509_get0_pubkey(ri->cert);
150 pctx = EVP_PKEY_CTX_new(pkey, NULL);
154 if (EVP_PKEY_encrypt_init(pctx) <= 0)
157 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
158 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
159 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
163 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
166 ek = OPENSSL_malloc(eklen);
169 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
173 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
176 ASN1_STRING_set0(ri->enc_key, ek, eklen);
182 EVP_PKEY_CTX_free(pctx);
188 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
189 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
191 EVP_PKEY_CTX *pctx = NULL;
192 unsigned char *ek = NULL;
197 pctx = EVP_PKEY_CTX_new(pkey, NULL);
201 if (EVP_PKEY_decrypt_init(pctx) <= 0)
204 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
205 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
206 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
210 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
211 ri->enc_key->data, ri->enc_key->length) <= 0)
214 ek = OPENSSL_malloc(eklen);
217 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
221 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
222 ri->enc_key->data, ri->enc_key->length) <= 0) {
224 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
230 OPENSSL_clear_free(*pek, *peklen);
235 EVP_PKEY_CTX_free(pctx);
242 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
245 BIO *out = NULL, *btmp = NULL;
246 X509_ALGOR *xa = NULL;
247 const EVP_CIPHER *evp_cipher = NULL;
248 STACK_OF(X509_ALGOR) *md_sk = NULL;
249 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
250 X509_ALGOR *xalg = NULL;
251 PKCS7_RECIP_INFO *ri = NULL;
252 ASN1_OCTET_STRING *os = NULL;
255 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
259 * The content field in the PKCS7 ContentInfo is optional, but that really
260 * only applies to inner content (precisely, detached signatures).
262 * When reading content, missing outer content is therefore treated as an
265 * When creating content, PKCS7_content_new() must be called before
266 * calling this method, so a NULL p7->d is always an error.
268 if (p7->d.ptr == NULL) {
269 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
273 i = OBJ_obj2nid(p7->type);
274 p7->state = PKCS7_S_HEADER;
277 case NID_pkcs7_signed:
278 md_sk = p7->d.sign->md_algs;
279 os = PKCS7_get_octet_string(p7->d.sign->contents);
281 case NID_pkcs7_signedAndEnveloped:
282 rsk = p7->d.signed_and_enveloped->recipientinfo;
283 md_sk = p7->d.signed_and_enveloped->md_algs;
284 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
285 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
286 if (evp_cipher == NULL) {
287 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
291 case NID_pkcs7_enveloped:
292 rsk = p7->d.enveloped->recipientinfo;
293 xalg = p7->d.enveloped->enc_data->algorithm;
294 evp_cipher = p7->d.enveloped->enc_data->cipher;
295 if (evp_cipher == NULL) {
296 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
300 case NID_pkcs7_digest:
301 xa = p7->d.digest->md;
302 os = PKCS7_get_octet_string(p7->d.digest->contents);
307 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
311 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
312 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
315 if (xa && !PKCS7_bio_add_digest(&out, xa))
318 if (evp_cipher != NULL) {
319 unsigned char key[EVP_MAX_KEY_LENGTH];
320 unsigned char iv[EVP_MAX_IV_LENGTH];
324 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
325 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
328 BIO_get_cipher_ctx(btmp, &ctx);
329 keylen = EVP_CIPHER_key_length(evp_cipher);
330 ivlen = EVP_CIPHER_iv_length(evp_cipher);
331 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
333 if (RAND_bytes(iv, ivlen) <= 0)
335 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
337 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
339 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
343 if (xalg->parameter == NULL) {
344 xalg->parameter = ASN1_TYPE_new();
345 if (xalg->parameter == NULL)
348 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
352 /* Lets do the pub key stuff :-) */
353 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
354 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
355 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
358 OPENSSL_cleanse(key, keylen);
368 if (PKCS7_is_detached(p7))
369 bio = BIO_new(BIO_s_null());
370 else if (os && os->length > 0)
371 bio = BIO_new_mem_buf(os->data, os->length);
373 bio = BIO_new(BIO_s_mem());
376 BIO_set_mem_eof_return(bio, 0);
391 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
394 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
395 X509_get_issuer_name(pcert));
398 return ASN1_INTEGER_cmp(X509_get_serialNumber(pcert),
399 ri->issuer_and_serial->serial);
403 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
406 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
408 ASN1_OCTET_STRING *data_body = NULL;
409 const EVP_MD *evp_md;
410 const EVP_CIPHER *evp_cipher = NULL;
411 EVP_CIPHER_CTX *evp_ctx = NULL;
412 X509_ALGOR *enc_alg = NULL;
413 STACK_OF(X509_ALGOR) *md_sk = NULL;
414 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
415 PKCS7_RECIP_INFO *ri = NULL;
416 unsigned char *ek = NULL, *tkey = NULL;
417 int eklen = 0, tkeylen = 0;
420 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
424 if (p7->d.ptr == NULL) {
425 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
429 i = OBJ_obj2nid(p7->type);
430 p7->state = PKCS7_S_HEADER;
433 case NID_pkcs7_signed:
435 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
436 * field and optional content.
437 * data_body is NULL if that structure has no (=detached) content
438 * or if the contentType is wrong (i.e., not "data").
440 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
441 if (!PKCS7_is_detached(p7) && data_body == NULL) {
442 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
443 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
446 md_sk = p7->d.sign->md_algs;
448 case NID_pkcs7_signedAndEnveloped:
449 rsk = p7->d.signed_and_enveloped->recipientinfo;
450 md_sk = p7->d.signed_and_enveloped->md_algs;
451 /* data_body is NULL if the optional EncryptedContent is missing. */
452 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
453 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
454 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
455 if (evp_cipher == NULL) {
456 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
457 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
461 case NID_pkcs7_enveloped:
462 rsk = p7->d.enveloped->recipientinfo;
463 enc_alg = p7->d.enveloped->enc_data->algorithm;
464 /* data_body is NULL if the optional EncryptedContent is missing. */
465 data_body = p7->d.enveloped->enc_data->enc_data;
466 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
467 if (evp_cipher == NULL) {
468 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
469 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
474 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
478 /* Detached content must be supplied via in_bio instead. */
479 if (data_body == NULL && in_bio == NULL) {
480 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
484 /* We will be checking the signature */
486 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
487 xa = sk_X509_ALGOR_value(md_sk, i);
488 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
489 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
493 j = OBJ_obj2nid(xa->algorithm);
494 evp_md = EVP_get_digestbynid(j);
495 if (evp_md == NULL) {
496 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
497 PKCS7_R_UNKNOWN_DIGEST_TYPE);
501 BIO_set_md(btmp, evp_md);
510 if (evp_cipher != NULL) {
511 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
512 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
517 * It was encrypted, we need to decrypt the secret key with the
522 * Find the recipientInfo which matches the passed certificate (if
527 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
528 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
529 if (!pkcs7_cmp_ri(ri, pcert))
534 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
535 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
540 /* If we haven't got a certificate try each ri in turn */
543 * Always attempt to decrypt all rinfo even after success as a
544 * defence against MMA timing attacks.
546 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
547 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
549 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
554 /* Only exit on fatal errors, not decrypt failure */
555 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey) < 0)
561 BIO_get_cipher_ctx(etmp, &evp_ctx);
562 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
564 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
566 /* Generate random key as MMA defence */
567 tkeylen = EVP_CIPHER_CTX_key_length(evp_ctx);
568 tkey = OPENSSL_malloc(tkeylen);
571 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
579 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
581 * Some S/MIME clients don't use the same key and effective key
582 * length. The key length is determined by the size of the
585 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
586 /* Use random key as MMA defence */
587 OPENSSL_clear_free(ek, eklen);
593 /* Clear errors so we don't leak information useful in MMA */
595 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
598 OPENSSL_clear_free(ek, eklen);
600 OPENSSL_clear_free(tkey, tkeylen);
609 if (in_bio != NULL) {
612 if (data_body->length > 0)
613 bio = BIO_new_mem_buf(data_body->data, data_body->length);
615 bio = BIO_new(BIO_s_mem());
618 BIO_set_mem_eof_return(bio, 0);
628 OPENSSL_clear_free(ek, eklen);
629 OPENSSL_clear_free(tkey, tkeylen);
637 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
640 bio = BIO_find_type(bio, BIO_TYPE_MD);
642 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
643 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
646 BIO_get_md_ctx(bio, pmd);
648 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
651 if (EVP_MD_CTX_type(*pmd) == nid)
658 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
660 unsigned char md_data[EVP_MAX_MD_SIZE];
663 /* Add signing time if not already present */
664 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
665 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
666 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
672 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
673 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
676 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
677 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
681 /* Now sign the attributes */
682 if (!PKCS7_SIGNER_INFO_sign(si))
688 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
693 PKCS7_SIGNER_INFO *si;
694 EVP_MD_CTX *mdc, *ctx_tmp;
695 STACK_OF(X509_ATTRIBUTE) *sk;
696 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
697 ASN1_OCTET_STRING *os = NULL;
700 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
704 if (p7->d.ptr == NULL) {
705 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
709 ctx_tmp = EVP_MD_CTX_new();
710 if (ctx_tmp == NULL) {
711 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
715 i = OBJ_obj2nid(p7->type);
716 p7->state = PKCS7_S_HEADER;
722 case NID_pkcs7_signedAndEnveloped:
723 /* XXXXXXXXXXXXXXXX */
724 si_sk = p7->d.signed_and_enveloped->signer_info;
725 os = p7->d.signed_and_enveloped->enc_data->enc_data;
727 os = ASN1_OCTET_STRING_new();
729 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
732 p7->d.signed_and_enveloped->enc_data->enc_data = os;
735 case NID_pkcs7_enveloped:
736 /* XXXXXXXXXXXXXXXX */
737 os = p7->d.enveloped->enc_data->enc_data;
739 os = ASN1_OCTET_STRING_new();
741 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
744 p7->d.enveloped->enc_data->enc_data = os;
747 case NID_pkcs7_signed:
748 si_sk = p7->d.sign->signer_info;
749 os = PKCS7_get_octet_string(p7->d.sign->contents);
750 /* If detached data then the content is excluded */
751 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
752 ASN1_OCTET_STRING_free(os);
754 p7->d.sign->contents->d.data = NULL;
758 case NID_pkcs7_digest:
759 os = PKCS7_get_octet_string(p7->d.digest->contents);
760 /* If detached data then the content is excluded */
761 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
762 ASN1_OCTET_STRING_free(os);
764 p7->d.digest->contents->d.data = NULL;
769 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
774 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
775 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
776 if (si->pkey == NULL)
779 j = OBJ_obj2nid(si->digest_alg->algorithm);
783 btmp = PKCS7_find_digest(&mdc, btmp, j);
789 * We now have the EVP_MD_CTX, lets do the signing.
791 if (!EVP_MD_CTX_copy_ex(ctx_tmp, mdc))
797 * If there are attributes, we add the digest attribute and only
798 * sign the attributes
800 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
801 if (!do_pkcs7_signed_attrib(si, ctx_tmp))
804 unsigned char *abuf = NULL;
805 unsigned int abuflen;
806 abuflen = EVP_PKEY_size(si->pkey);
807 abuf = OPENSSL_malloc(abuflen);
811 if (!EVP_SignFinal(ctx_tmp, abuf, &abuflen, si->pkey)) {
812 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
815 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
818 } else if (i == NID_pkcs7_digest) {
819 unsigned char md_data[EVP_MAX_MD_SIZE];
821 if (!PKCS7_find_digest(&mdc, bio,
822 OBJ_obj2nid(p7->d.digest->md->algorithm)))
824 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
826 ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
829 if (!PKCS7_is_detached(p7)) {
831 * NOTE(emilia): I think we only reach os == NULL here because detached
832 * digested data support is broken.
836 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
839 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
841 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
844 contlen = BIO_get_mem_data(btmp, &cont);
846 * Mark the BIO read only then we can use its copy of the data
847 * instead of making an extra copy.
849 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
850 BIO_set_mem_eof_return(btmp, 0);
851 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
856 EVP_MD_CTX_free(ctx_tmp);
860 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
864 unsigned char *abuf = NULL;
867 const EVP_MD *md = NULL;
869 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
873 mctx = EVP_MD_CTX_new();
875 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, ERR_R_MALLOC_FAILURE);
879 if (EVP_DigestSignInit(mctx, &pctx, md, NULL, si->pkey) <= 0)
882 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
883 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
884 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
888 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
889 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
892 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
896 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
898 abuf = OPENSSL_malloc(siglen);
901 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
904 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
905 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
906 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
910 EVP_MD_CTX_free(mctx);
912 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
918 EVP_MD_CTX_free(mctx);
923 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
924 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
926 PKCS7_ISSUER_AND_SERIAL *ias;
928 STACK_OF(X509) *cert;
932 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
936 if (p7->d.ptr == NULL) {
937 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
941 if (PKCS7_type_is_signed(p7)) {
942 cert = p7->d.sign->cert;
943 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
944 cert = p7->d.signed_and_enveloped->cert;
946 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
949 /* XXXXXXXXXXXXXXXXXXXXXXX */
950 ias = si->issuer_and_serial;
952 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
954 /* were we able to find the cert in passed to us */
956 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
957 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
962 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
963 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
966 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
967 i = X509_verify_cert(ctx);
969 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
970 X509_STORE_CTX_cleanup(ctx);
973 X509_STORE_CTX_cleanup(ctx);
975 return PKCS7_signatureVerify(bio, p7, si, x509);
980 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
983 ASN1_OCTET_STRING *os;
984 EVP_MD_CTX *mdc_tmp, *mdc;
987 STACK_OF(X509_ATTRIBUTE) *sk;
991 mdc_tmp = EVP_MD_CTX_new();
992 if (mdc_tmp == NULL) {
993 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
997 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
998 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1002 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1006 if ((btmp == NULL) ||
1007 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1008 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1009 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1012 BIO_get_md_ctx(btmp, &mdc);
1014 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1017 if (EVP_MD_CTX_type(mdc) == md_type)
1020 * Workaround for some broken clients that put the signature OID
1021 * instead of the digest OID in digest_alg->algorithm
1023 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1025 btmp = BIO_next(btmp);
1029 * mdc is the digest ctx that we want, unless there are attributes, in
1030 * which case the digest is the signed attributes
1032 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1036 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1037 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1038 unsigned int md_len;
1040 ASN1_OCTET_STRING *message_digest;
1042 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1044 message_digest = PKCS7_digest_from_attributes(sk);
1045 if (!message_digest) {
1046 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1047 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1050 if ((message_digest->length != (int)md_len) ||
1051 (memcmp(message_digest->data, md_dat, md_len))) {
1052 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1057 if (!EVP_VerifyInit_ex(mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1060 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1061 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1063 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1067 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1073 os = si->enc_digest;
1074 pkey = X509_get0_pubkey(x509);
1080 i = EVP_VerifyFinal(mdc_tmp, os->data, os->length, pkey);
1082 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1088 EVP_MD_CTX_free(mdc_tmp);
1092 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1094 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1095 PKCS7_RECIP_INFO *ri;
1098 i = OBJ_obj2nid(p7->type);
1099 if (i != NID_pkcs7_signedAndEnveloped)
1101 if (p7->d.signed_and_enveloped == NULL)
1103 rsk = p7->d.signed_and_enveloped->recipientinfo;
1106 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1108 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1109 return (ri->issuer_and_serial);
1112 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1114 return (get_attribute(si->auth_attr, nid));
1117 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1119 return (get_attribute(si->unauth_attr, nid));
1122 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1126 idx = X509at_get_attr_by_NID(sk, nid, -1);
1127 xa = X509at_get_attr(sk, idx);
1128 return X509_ATTRIBUTE_get0_type(xa, 0);
1131 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1134 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1136 return astype->value.octet_string;
1139 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1140 STACK_OF(X509_ATTRIBUTE) *sk)
1144 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1145 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1146 if (p7si->auth_attr == NULL)
1148 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1149 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1150 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1158 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1159 STACK_OF(X509_ATTRIBUTE) *sk)
1163 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1164 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1165 if (p7si->unauth_attr == NULL)
1167 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1168 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1169 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1177 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1180 return (add_attribute(&(p7si->auth_attr), nid, atrtype, value));
1183 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1186 return (add_attribute(&(p7si->unauth_attr), nid, atrtype, value));
1189 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1192 X509_ATTRIBUTE *attr = NULL;
1195 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1198 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1200 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1201 X509_ATTRIBUTE_free(attr);
1207 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1208 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1209 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1210 X509_ATTRIBUTE_free(attr);
1211 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1214 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1215 X509_ATTRIBUTE_free(attr);