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.]
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);
137 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
138 unsigned char *key, int keylen)
140 EVP_PKEY_CTX *pctx = NULL;
141 EVP_PKEY *pkey = NULL;
142 unsigned char *ek = NULL;
146 pkey = X509_get_pubkey(ri->cert);
151 pctx = EVP_PKEY_CTX_new(pkey, NULL);
155 if (EVP_PKEY_encrypt_init(pctx) <= 0)
158 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
159 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
160 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
164 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
167 ek = OPENSSL_malloc(eklen);
170 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
174 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
177 ASN1_STRING_set0(ri->enc_key, ek, eklen);
186 EVP_PKEY_CTX_free(pctx);
193 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
194 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey)
196 EVP_PKEY_CTX *pctx = NULL;
197 unsigned char *ek = NULL;
202 pctx = EVP_PKEY_CTX_new(pkey, NULL);
206 if (EVP_PKEY_decrypt_init(pctx) <= 0)
209 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
210 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
211 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
215 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
216 ri->enc_key->data, ri->enc_key->length) <= 0)
219 ek = OPENSSL_malloc(eklen);
222 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
226 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
227 ri->enc_key->data, ri->enc_key->length) <= 0) {
229 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
236 OPENSSL_cleanse(*pek, *peklen);
245 EVP_PKEY_CTX_free(pctx);
252 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
255 BIO *out = NULL, *btmp = NULL;
256 X509_ALGOR *xa = NULL;
257 const EVP_CIPHER *evp_cipher = NULL;
258 STACK_OF(X509_ALGOR) *md_sk = NULL;
259 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
260 X509_ALGOR *xalg = NULL;
261 PKCS7_RECIP_INFO *ri = NULL;
262 ASN1_OCTET_STRING *os = NULL;
265 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
269 * The content field in the PKCS7 ContentInfo is optional, but that really
270 * only applies to inner content (precisely, detached signatures).
272 * When reading content, missing outer content is therefore treated as an
275 * When creating content, PKCS7_content_new() must be called before
276 * calling this method, so a NULL p7->d is always an error.
278 if (p7->d.ptr == NULL) {
279 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
283 i = OBJ_obj2nid(p7->type);
284 p7->state = PKCS7_S_HEADER;
287 case NID_pkcs7_signed:
288 md_sk = p7->d.sign->md_algs;
289 os = PKCS7_get_octet_string(p7->d.sign->contents);
291 case NID_pkcs7_signedAndEnveloped:
292 rsk = p7->d.signed_and_enveloped->recipientinfo;
293 md_sk = p7->d.signed_and_enveloped->md_algs;
294 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
295 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
296 if (evp_cipher == NULL) {
297 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
301 case NID_pkcs7_enveloped:
302 rsk = p7->d.enveloped->recipientinfo;
303 xalg = p7->d.enveloped->enc_data->algorithm;
304 evp_cipher = p7->d.enveloped->enc_data->cipher;
305 if (evp_cipher == NULL) {
306 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
310 case NID_pkcs7_digest:
311 xa = p7->d.digest->md;
312 os = PKCS7_get_octet_string(p7->d.digest->contents);
317 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
321 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
322 if (!PKCS7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i)))
325 if (xa && !PKCS7_bio_add_digest(&out, xa))
328 if (evp_cipher != NULL) {
329 unsigned char key[EVP_MAX_KEY_LENGTH];
330 unsigned char iv[EVP_MAX_IV_LENGTH];
334 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
335 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
338 BIO_get_cipher_ctx(btmp, &ctx);
339 keylen = EVP_CIPHER_key_length(evp_cipher);
340 ivlen = EVP_CIPHER_iv_length(evp_cipher);
341 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
343 if (RAND_pseudo_bytes(iv, ivlen) <= 0)
345 if (EVP_CipherInit_ex(ctx, evp_cipher, NULL, NULL, NULL, 1) <= 0)
347 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
349 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
353 if (xalg->parameter == NULL) {
354 xalg->parameter = ASN1_TYPE_new();
355 if (xalg->parameter == NULL)
358 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
362 /* Lets do the pub key stuff :-) */
363 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
364 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
365 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
368 OPENSSL_cleanse(key, keylen);
378 if (PKCS7_is_detached(p7))
379 bio = BIO_new(BIO_s_null());
380 else if (os && os->length > 0)
381 bio = BIO_new_mem_buf(os->data, os->length);
383 bio = BIO_new(BIO_s_mem());
386 BIO_set_mem_eof_return(bio, 0);
405 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
408 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
409 pcert->cert_info->issuer);
412 return M_ASN1_INTEGER_cmp(pcert->cert_info->serialNumber,
413 ri->issuer_and_serial->serial);
417 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
420 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
422 ASN1_OCTET_STRING *data_body = NULL;
423 const EVP_MD *evp_md;
424 const EVP_CIPHER *evp_cipher = NULL;
425 EVP_CIPHER_CTX *evp_ctx = NULL;
426 X509_ALGOR *enc_alg = NULL;
427 STACK_OF(X509_ALGOR) *md_sk = NULL;
428 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
429 PKCS7_RECIP_INFO *ri = NULL;
430 unsigned char *ek = NULL, *tkey = NULL;
431 int eklen = 0, tkeylen = 0;
434 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
438 if (p7->d.ptr == NULL) {
439 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
443 i = OBJ_obj2nid(p7->type);
444 p7->state = PKCS7_S_HEADER;
447 case NID_pkcs7_signed:
448 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
449 if (!PKCS7_is_detached(p7) && data_body == NULL) {
450 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
451 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
454 md_sk = p7->d.sign->md_algs;
456 case NID_pkcs7_signedAndEnveloped:
457 rsk = p7->d.signed_and_enveloped->recipientinfo;
458 md_sk = p7->d.signed_and_enveloped->md_algs;
459 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
460 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
461 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
462 if (evp_cipher == NULL) {
463 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
464 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
468 case NID_pkcs7_enveloped:
469 rsk = p7->d.enveloped->recipientinfo;
470 enc_alg = p7->d.enveloped->enc_data->algorithm;
471 data_body = p7->d.enveloped->enc_data->enc_data;
472 evp_cipher = EVP_get_cipherbyobj(enc_alg->algorithm);
473 if (evp_cipher == NULL) {
474 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
475 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
480 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
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_cleanse(ek, eklen);
594 /* Clear errors so we don't leak information useful in MMA */
596 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
600 OPENSSL_cleanse(ek, eklen);
605 OPENSSL_cleanse(tkey, tkeylen);
616 if (PKCS7_is_detached(p7) || (in_bio != NULL)) {
619 if (data_body->length > 0)
620 bio = BIO_new_mem_buf(data_body->data, data_body->length);
622 bio = BIO_new(BIO_s_mem());
623 BIO_set_mem_eof_return(bio, 0);
633 OPENSSL_cleanse(ek, eklen);
637 OPENSSL_cleanse(tkey, tkeylen);
653 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
656 bio = BIO_find_type(bio, BIO_TYPE_MD);
658 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
659 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
662 BIO_get_md_ctx(bio, pmd);
664 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
667 if (EVP_MD_CTX_type(*pmd) == nid)
674 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
676 unsigned char md_data[EVP_MAX_MD_SIZE];
679 /* Add signing time if not already present */
680 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
681 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
682 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
688 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
689 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
692 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
693 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
697 /* Now sign the attributes */
698 if (!PKCS7_SIGNER_INFO_sign(si))
704 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
709 PKCS7_SIGNER_INFO *si;
710 EVP_MD_CTX *mdc, ctx_tmp;
711 STACK_OF(X509_ATTRIBUTE) *sk;
712 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
713 ASN1_OCTET_STRING *os = NULL;
716 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
720 if (p7->d.ptr == NULL) {
721 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
725 EVP_MD_CTX_init(&ctx_tmp);
726 i = OBJ_obj2nid(p7->type);
727 p7->state = PKCS7_S_HEADER;
733 case NID_pkcs7_signedAndEnveloped:
734 /* XXXXXXXXXXXXXXXX */
735 si_sk = p7->d.signed_and_enveloped->signer_info;
736 os = p7->d.signed_and_enveloped->enc_data->enc_data;
738 os = M_ASN1_OCTET_STRING_new();
740 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
743 p7->d.signed_and_enveloped->enc_data->enc_data = os;
746 case NID_pkcs7_enveloped:
747 /* XXXXXXXXXXXXXXXX */
748 os = p7->d.enveloped->enc_data->enc_data;
750 os = M_ASN1_OCTET_STRING_new();
752 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_MALLOC_FAILURE);
755 p7->d.enveloped->enc_data->enc_data = os;
758 case NID_pkcs7_signed:
759 si_sk = p7->d.sign->signer_info;
760 os = PKCS7_get_octet_string(p7->d.sign->contents);
761 /* If detached data then the content is excluded */
762 if (PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
763 M_ASN1_OCTET_STRING_free(os);
765 p7->d.sign->contents->d.data = NULL;
769 case NID_pkcs7_digest:
770 os = PKCS7_get_octet_string(p7->d.digest->contents);
771 /* If detached data then the content is excluded */
772 if (PKCS7_type_is_data(p7->d.digest->contents) && p7->detached) {
773 M_ASN1_OCTET_STRING_free(os);
775 p7->d.digest->contents->d.data = NULL;
780 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
785 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(si_sk); i++) {
786 si = sk_PKCS7_SIGNER_INFO_value(si_sk, i);
787 if (si->pkey == NULL)
790 j = OBJ_obj2nid(si->digest_alg->algorithm);
794 btmp = PKCS7_find_digest(&mdc, btmp, j);
800 * We now have the EVP_MD_CTX, lets do the signing.
802 if (!EVP_MD_CTX_copy_ex(&ctx_tmp, mdc))
808 * If there are attributes, we add the digest attribute and only
809 * sign the attributes
811 if (sk_X509_ATTRIBUTE_num(sk) > 0) {
812 if (!do_pkcs7_signed_attrib(si, &ctx_tmp))
815 unsigned char *abuf = NULL;
816 unsigned int abuflen;
817 abuflen = EVP_PKEY_size(si->pkey);
818 abuf = OPENSSL_malloc(abuflen);
822 if (!EVP_SignFinal(&ctx_tmp, abuf, &abuflen, si->pkey)) {
823 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
826 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
829 } else if (i == NID_pkcs7_digest) {
830 unsigned char md_data[EVP_MAX_MD_SIZE];
832 if (!PKCS7_find_digest(&mdc, bio,
833 OBJ_obj2nid(p7->d.digest->md->algorithm)))
835 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
837 M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
840 if (!PKCS7_is_detached(p7)) {
842 * NOTE(emilia): I think we only reach os == NULL here because detached
843 * digested data support is broken.
847 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
850 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
852 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
855 contlen = BIO_get_mem_data(btmp, &cont);
857 * Mark the BIO read only then we can use its copy of the data
858 * instead of making an extra copy.
860 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
861 BIO_set_mem_eof_return(btmp, 0);
862 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
867 EVP_MD_CTX_cleanup(&ctx_tmp);
871 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
875 unsigned char *abuf = NULL;
878 const EVP_MD *md = NULL;
880 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
884 EVP_MD_CTX_init(&mctx);
885 if (EVP_DigestSignInit(&mctx, &pctx, md, NULL, si->pkey) <= 0)
888 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
889 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
890 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
894 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
895 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
898 if (EVP_DigestSignUpdate(&mctx, abuf, alen) <= 0)
902 if (EVP_DigestSignFinal(&mctx, NULL, &siglen) <= 0)
904 abuf = OPENSSL_malloc(siglen);
907 if (EVP_DigestSignFinal(&mctx, abuf, &siglen) <= 0)
910 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
911 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
912 PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SIGN, PKCS7_R_CTRL_ERROR);
916 EVP_MD_CTX_cleanup(&mctx);
918 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
925 EVP_MD_CTX_cleanup(&mctx);
930 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
931 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
933 PKCS7_ISSUER_AND_SERIAL *ias;
935 STACK_OF(X509) *cert;
939 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
943 if (p7->d.ptr == NULL) {
944 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
948 if (PKCS7_type_is_signed(p7)) {
949 cert = p7->d.sign->cert;
950 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
951 cert = p7->d.signed_and_enveloped->cert;
953 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
956 /* XXXXXXXXXXXXXXXXXXXXXXX */
957 ias = si->issuer_and_serial;
959 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
961 /* were we able to find the cert in passed to us */
963 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
964 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
969 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
970 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
973 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
974 i = X509_verify_cert(ctx);
976 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
977 X509_STORE_CTX_cleanup(ctx);
980 X509_STORE_CTX_cleanup(ctx);
982 return PKCS7_signatureVerify(bio, p7, si, x509);
987 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
990 ASN1_OCTET_STRING *os;
991 EVP_MD_CTX mdc_tmp, *mdc;
994 STACK_OF(X509_ATTRIBUTE) *sk;
998 EVP_MD_CTX_init(&mdc_tmp);
1000 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1001 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1005 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1009 if ((btmp == NULL) ||
1010 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1011 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1012 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1015 BIO_get_md_ctx(btmp, &mdc);
1017 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1020 if (EVP_MD_CTX_type(mdc) == md_type)
1023 * Workaround for some broken clients that put the signature OID
1024 * instead of the digest OID in digest_alg->algorithm
1026 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1028 btmp = BIO_next(btmp);
1032 * mdc is the digest ctx that we want, unless there are attributes, in
1033 * which case the digest is the signed attributes
1035 if (!EVP_MD_CTX_copy_ex(&mdc_tmp, mdc))
1039 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1040 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1041 unsigned int md_len;
1043 ASN1_OCTET_STRING *message_digest;
1045 if (!EVP_DigestFinal_ex(&mdc_tmp, md_dat, &md_len))
1047 message_digest = PKCS7_digest_from_attributes(sk);
1048 if (!message_digest) {
1049 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1050 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1053 if ((message_digest->length != (int)md_len) ||
1054 (memcmp(message_digest->data, md_dat, md_len))) {
1055 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1060 if (!EVP_VerifyInit_ex(&mdc_tmp, EVP_get_digestbynid(md_type), NULL))
1063 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1064 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1066 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1070 if (!EVP_VerifyUpdate(&mdc_tmp, abuf, alen))
1076 os = si->enc_digest;
1077 pkey = X509_get_pubkey(x509);
1083 i = EVP_VerifyFinal(&mdc_tmp, os->data, os->length, pkey);
1084 EVP_PKEY_free(pkey);
1086 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1092 EVP_MD_CTX_cleanup(&mdc_tmp);
1096 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1098 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1099 PKCS7_RECIP_INFO *ri;
1102 i = OBJ_obj2nid(p7->type);
1103 if (i != NID_pkcs7_signedAndEnveloped)
1105 if (p7->d.signed_and_enveloped == NULL)
1107 rsk = p7->d.signed_and_enveloped->recipientinfo;
1110 ri = sk_PKCS7_RECIP_INFO_value(rsk, 0);
1111 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1113 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1114 return (ri->issuer_and_serial);
1117 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1119 return (get_attribute(si->auth_attr, nid));
1122 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1124 return (get_attribute(si->unauth_attr, nid));
1127 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1131 idx = X509at_get_attr_by_NID(sk, nid, -1);
1132 xa = X509at_get_attr(sk, idx);
1133 return X509_ATTRIBUTE_get0_type(xa, 0);
1136 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1139 if (!(astype = get_attribute(sk, NID_pkcs9_messageDigest)))
1141 return astype->value.octet_string;
1144 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1145 STACK_OF(X509_ATTRIBUTE) *sk)
1149 if (p7si->auth_attr != NULL)
1150 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1151 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1152 if (p7si->auth_attr == NULL)
1154 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1155 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1156 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1164 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1165 STACK_OF(X509_ATTRIBUTE) *sk)
1169 if (p7si->unauth_attr != NULL)
1170 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1171 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1172 if (p7si->unauth_attr == NULL)
1174 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1175 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1176 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1184 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1187 return (add_attribute(&(p7si->auth_attr), nid, atrtype, value));
1190 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1193 return (add_attribute(&(p7si->unauth_attr), nid, atrtype, value));
1196 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1199 X509_ATTRIBUTE *attr = NULL;
1202 *sk = sk_X509_ATTRIBUTE_new_null();
1206 if (!(attr = X509_ATTRIBUTE_create(nid, atrtype, value)))
1208 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1209 X509_ATTRIBUTE_free(attr);
1215 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1216 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1217 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1218 X509_ATTRIBUTE_free(attr);
1219 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1222 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1223 X509_ATTRIBUTE_free(attr);