2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include "internal/cryptlib.h"
12 #include <openssl/rand.h>
13 #include <openssl/objects.h>
14 #include <openssl/x509.h>
15 #include <openssl/x509v3.h>
16 #include <openssl/err.h>
17 #include "pk7_local.h"
19 DEFINE_STACK_OF(X509_ALGOR)
20 DEFINE_STACK_OF(X509_ATTRIBUTE)
21 DEFINE_STACK_OF(PKCS7_RECIP_INFO)
22 DEFINE_STACK_OF(PKCS7_SIGNER_INFO)
24 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
26 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid);
28 static int PKCS7_type_is_other(PKCS7 *p7)
32 int nid = OBJ_obj2nid(p7->type);
36 case NID_pkcs7_signed:
37 case NID_pkcs7_enveloped:
38 case NID_pkcs7_signedAndEnveloped:
39 case NID_pkcs7_digest:
40 case NID_pkcs7_encrypted:
51 static ASN1_OCTET_STRING *PKCS7_get_octet_string(PKCS7 *p7)
53 if (PKCS7_type_is_data(p7))
55 if (PKCS7_type_is_other(p7) && p7->d.other
56 && (p7->d.other->type == V_ASN1_OCTET_STRING))
57 return p7->d.other->value.octet_string;
61 static int pkcs7_bio_add_digest(BIO **pbio, X509_ALGOR *alg,
66 EVP_MD *fetched = NULL;
68 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
69 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
73 name = OBJ_nid2sn(OBJ_obj2nid(alg->algorithm));
74 fetched = EVP_MD_fetch(ctx->libctx, name, ctx->propq);
75 if (fetched == NULL) {
76 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, PKCS7_R_UNKNOWN_DIGEST_TYPE);
80 BIO_set_md(btmp, fetched);
84 else if (!BIO_push(*pbio, btmp)) {
85 PKCS7err(PKCS7_F_PKCS7_BIO_ADD_DIGEST, ERR_R_BIO_LIB);
97 static int pkcs7_encode_rinfo(PKCS7_RECIP_INFO *ri,
98 unsigned char *key, int keylen)
100 EVP_PKEY_CTX *pctx = NULL;
101 EVP_PKEY *pkey = NULL;
102 unsigned char *ek = NULL;
105 const PKCS7_CTX *ctx = ri->ctx;
107 pkey = X509_get0_pubkey(ri->cert);
111 pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, pkey, ctx->propq);
115 if (EVP_PKEY_encrypt_init(pctx) <= 0)
118 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
119 EVP_PKEY_CTRL_PKCS7_ENCRYPT, 0, ri) <= 0) {
120 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, PKCS7_R_CTRL_ERROR);
124 if (EVP_PKEY_encrypt(pctx, NULL, &eklen, key, keylen) <= 0)
127 ek = OPENSSL_malloc(eklen);
130 PKCS7err(PKCS7_F_PKCS7_ENCODE_RINFO, ERR_R_MALLOC_FAILURE);
134 if (EVP_PKEY_encrypt(pctx, ek, &eklen, key, keylen) <= 0)
137 ASN1_STRING_set0(ri->enc_key, ek, eklen);
143 EVP_PKEY_CTX_free(pctx);
149 static int pkcs7_decrypt_rinfo(unsigned char **pek, int *peklen,
150 PKCS7_RECIP_INFO *ri, EVP_PKEY *pkey,
153 EVP_PKEY_CTX *pctx = NULL;
154 unsigned char *ek = NULL;
157 const PKCS7_CTX *ctx = ri->ctx;
159 pctx = EVP_PKEY_CTX_new_from_pkey(ctx->libctx, pkey, ctx->propq);
163 if (EVP_PKEY_decrypt_init(pctx) <= 0)
166 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
167 EVP_PKEY_CTRL_PKCS7_DECRYPT, 0, ri) <= 0) {
168 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, PKCS7_R_CTRL_ERROR);
172 if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
173 ri->enc_key->data, ri->enc_key->length) <= 0)
176 ek = OPENSSL_malloc(eklen);
179 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_MALLOC_FAILURE);
183 if (EVP_PKEY_decrypt(pctx, ek, &eklen,
184 ri->enc_key->data, ri->enc_key->length) <= 0
186 || (fixlen != 0 && eklen != fixlen)) {
188 PKCS7err(PKCS7_F_PKCS7_DECRYPT_RINFO, ERR_R_EVP_LIB);
194 OPENSSL_clear_free(*pek, *peklen);
199 EVP_PKEY_CTX_free(pctx);
206 BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
209 BIO *out = NULL, *btmp = NULL;
210 X509_ALGOR *xa = NULL;
211 EVP_CIPHER *fetched_cipher = NULL;
212 const EVP_CIPHER *evp_cipher = NULL;
213 STACK_OF(X509_ALGOR) *md_sk = NULL;
214 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
215 X509_ALGOR *xalg = NULL;
216 PKCS7_RECIP_INFO *ri = NULL;
217 ASN1_OCTET_STRING *os = NULL;
218 const PKCS7_CTX *p7_ctx;
221 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
224 p7_ctx = pkcs7_get0_ctx(p7);
227 * The content field in the PKCS7 ContentInfo is optional, but that really
228 * only applies to inner content (precisely, detached signatures).
230 * When reading content, missing outer content is therefore treated as an
233 * When creating content, PKCS7_content_new() must be called before
234 * calling this method, so a NULL p7->d is always an error.
236 if (p7->d.ptr == NULL) {
237 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
241 i = OBJ_obj2nid(p7->type);
242 p7->state = PKCS7_S_HEADER;
245 case NID_pkcs7_signed:
246 md_sk = p7->d.sign->md_algs;
247 os = PKCS7_get_octet_string(p7->d.sign->contents);
249 case NID_pkcs7_signedAndEnveloped:
250 rsk = p7->d.signed_and_enveloped->recipientinfo;
251 md_sk = p7->d.signed_and_enveloped->md_algs;
252 xalg = p7->d.signed_and_enveloped->enc_data->algorithm;
253 evp_cipher = p7->d.signed_and_enveloped->enc_data->cipher;
254 if (evp_cipher == NULL) {
255 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
259 case NID_pkcs7_enveloped:
260 rsk = p7->d.enveloped->recipientinfo;
261 xalg = p7->d.enveloped->enc_data->algorithm;
262 evp_cipher = p7->d.enveloped->enc_data->cipher;
263 if (evp_cipher == NULL) {
264 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_CIPHER_NOT_INITIALIZED);
268 case NID_pkcs7_digest:
269 xa = p7->d.digest->md;
270 os = PKCS7_get_octet_string(p7->d.digest->contents);
275 PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
279 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++)
280 if (!pkcs7_bio_add_digest(&out, sk_X509_ALGOR_value(md_sk, i), p7_ctx))
283 if (xa && !pkcs7_bio_add_digest(&out, xa, p7_ctx))
286 if (evp_cipher != NULL) {
287 unsigned char key[EVP_MAX_KEY_LENGTH];
288 unsigned char iv[EVP_MAX_IV_LENGTH];
292 if ((btmp = BIO_new(BIO_f_cipher())) == NULL) {
293 PKCS7err(PKCS7_F_PKCS7_DATAINIT, ERR_R_BIO_LIB);
296 BIO_get_cipher_ctx(btmp, &ctx);
297 keylen = EVP_CIPHER_key_length(evp_cipher);
298 ivlen = EVP_CIPHER_iv_length(evp_cipher);
299 xalg->algorithm = OBJ_nid2obj(EVP_CIPHER_type(evp_cipher));
301 if (RAND_bytes_ex(p7_ctx->libctx, iv, ivlen) <= 0)
304 fetched_cipher = EVP_CIPHER_fetch(p7_ctx->libctx,
305 EVP_CIPHER_name(evp_cipher),
307 if (fetched_cipher == NULL)
310 if (EVP_CipherInit_ex(ctx, fetched_cipher, NULL, NULL, NULL, 1) <= 0)
313 EVP_CIPHER_free(fetched_cipher);
314 fetched_cipher = NULL;
316 if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
318 if (EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, 1) <= 0)
322 if (xalg->parameter == NULL) {
323 xalg->parameter = ASN1_TYPE_new();
324 if (xalg->parameter == NULL)
327 if (EVP_CIPHER_param_to_asn1(ctx, xalg->parameter) < 0)
331 /* Lets do the pub key stuff :-) */
332 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
333 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
334 if (pkcs7_encode_rinfo(ri, key, keylen) <= 0)
337 OPENSSL_cleanse(key, keylen);
347 if (PKCS7_is_detached(p7)) {
348 bio = BIO_new(BIO_s_null());
349 } else if (os && os->length > 0) {
350 bio = BIO_new_mem_buf(os->data, os->length);
352 bio = BIO_new(BIO_s_mem());
355 BIO_set_mem_eof_return(bio, 0);
367 EVP_CIPHER_free(fetched_cipher);
373 static int pkcs7_cmp_ri(PKCS7_RECIP_INFO *ri, X509 *pcert)
376 ret = X509_NAME_cmp(ri->issuer_and_serial->issuer,
377 X509_get_issuer_name(pcert));
380 return ASN1_INTEGER_cmp(X509_get0_serialNumber(pcert),
381 ri->issuer_and_serial->serial);
385 BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
388 BIO *out = NULL, *btmp = NULL, *etmp = NULL, *bio = NULL;
390 ASN1_OCTET_STRING *data_body = NULL;
391 EVP_MD *evp_md = NULL;
392 EVP_CIPHER *evp_cipher = NULL;
393 EVP_CIPHER_CTX *evp_ctx = NULL;
394 X509_ALGOR *enc_alg = NULL;
395 STACK_OF(X509_ALGOR) *md_sk = NULL;
396 STACK_OF(PKCS7_RECIP_INFO) *rsk = NULL;
397 PKCS7_RECIP_INFO *ri = NULL;
398 unsigned char *ek = NULL, *tkey = NULL;
399 int eklen = 0, tkeylen = 0;
401 const PKCS7_CTX *p7_ctx;
404 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
408 p7_ctx = pkcs7_get0_ctx(p7);
410 if (p7->d.ptr == NULL) {
411 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
415 i = OBJ_obj2nid(p7->type);
416 p7->state = PKCS7_S_HEADER;
419 case NID_pkcs7_signed:
421 * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
422 * field and optional content.
423 * data_body is NULL if that structure has no (=detached) content
424 * or if the contentType is wrong (i.e., not "data").
426 data_body = PKCS7_get_octet_string(p7->d.sign->contents);
427 if (!PKCS7_is_detached(p7) && data_body == NULL) {
428 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
429 PKCS7_R_INVALID_SIGNED_DATA_TYPE);
432 md_sk = p7->d.sign->md_algs;
434 case NID_pkcs7_signedAndEnveloped:
435 rsk = p7->d.signed_and_enveloped->recipientinfo;
436 md_sk = p7->d.signed_and_enveloped->md_algs;
437 /* data_body is NULL if the optional EncryptedContent is missing. */
438 data_body = p7->d.signed_and_enveloped->enc_data->enc_data;
439 enc_alg = p7->d.signed_and_enveloped->enc_data->algorithm;
441 name = OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm));
442 evp_cipher = EVP_CIPHER_fetch(p7_ctx->libctx, name, p7_ctx->propq);
443 if (evp_cipher == NULL) {
444 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
445 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
449 case NID_pkcs7_enveloped:
450 rsk = p7->d.enveloped->recipientinfo;
451 enc_alg = p7->d.enveloped->enc_data->algorithm;
452 /* data_body is NULL if the optional EncryptedContent is missing. */
453 data_body = p7->d.enveloped->enc_data->enc_data;
454 name = OBJ_nid2sn(OBJ_obj2nid(enc_alg->algorithm));
455 evp_cipher = EVP_CIPHER_fetch(p7_ctx->libctx, name, p7_ctx->propq);
456 if (evp_cipher == NULL) {
457 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
458 PKCS7_R_UNSUPPORTED_CIPHER_TYPE);
463 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_UNSUPPORTED_CONTENT_TYPE);
467 /* Detached content must be supplied via in_bio instead. */
468 if (data_body == NULL && in_bio == NULL) {
469 PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
473 /* We will be checking the signature */
475 for (i = 0; i < sk_X509_ALGOR_num(md_sk); i++) {
476 xa = sk_X509_ALGOR_value(md_sk, i);
477 if ((btmp = BIO_new(BIO_f_md())) == NULL) {
478 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
482 name = OBJ_nid2sn(OBJ_obj2nid(xa->algorithm));
483 evp_md = EVP_MD_fetch(p7_ctx->libctx, name, p7_ctx->propq);
484 if (evp_md == NULL) {
485 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
486 PKCS7_R_UNKNOWN_DIGEST_TYPE);
490 BIO_set_md(btmp, evp_md);
500 if (evp_cipher != NULL) {
501 if ((etmp = BIO_new(BIO_f_cipher())) == NULL) {
502 PKCS7err(PKCS7_F_PKCS7_DATADECODE, ERR_R_BIO_LIB);
507 * It was encrypted, we need to decrypt the secret key with the
512 * Find the recipientInfo which matches the passed certificate (if
517 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
518 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
519 if (!pkcs7_cmp_ri(ri, pcert))
524 PKCS7err(PKCS7_F_PKCS7_DATADECODE,
525 PKCS7_R_NO_RECIPIENT_MATCHES_CERTIFICATE);
530 /* If we haven't got a certificate try each ri in turn */
533 * Always attempt to decrypt all rinfo even after success as a
534 * defence against MMA timing attacks.
536 for (i = 0; i < sk_PKCS7_RECIP_INFO_num(rsk); i++) {
537 ri = sk_PKCS7_RECIP_INFO_value(rsk, i);
539 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey,
540 EVP_CIPHER_key_length(evp_cipher)) < 0)
546 /* Only exit on fatal errors, not decrypt failure */
547 if (pkcs7_decrypt_rinfo(&ek, &eklen, ri, pkey, 0) < 0)
553 BIO_get_cipher_ctx(etmp, &evp_ctx);
554 if (EVP_CipherInit_ex(evp_ctx, evp_cipher, NULL, NULL, NULL, 0) <= 0)
556 if (EVP_CIPHER_asn1_to_param(evp_ctx, enc_alg->parameter) < 0)
558 /* Generate random key as MMA defence */
559 len = EVP_CIPHER_CTX_key_length(evp_ctx);
562 tkeylen = (size_t)len;
563 tkey = OPENSSL_malloc(tkeylen);
566 if (EVP_CIPHER_CTX_rand_key(evp_ctx, tkey) <= 0)
574 if (eklen != EVP_CIPHER_CTX_key_length(evp_ctx)) {
576 * Some S/MIME clients don't use the same key and effective key
577 * length. The key length is determined by the size of the
580 if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, eklen)) {
581 /* Use random key as MMA defence */
582 OPENSSL_clear_free(ek, eklen);
588 /* Clear errors so we don't leak information useful in MMA */
590 if (EVP_CipherInit_ex(evp_ctx, NULL, NULL, ek, NULL, 0) <= 0)
593 OPENSSL_clear_free(ek, eklen);
595 OPENSSL_clear_free(tkey, tkeylen);
604 if (in_bio != NULL) {
607 if (data_body->length > 0)
608 bio = BIO_new_mem_buf(data_body->data, data_body->length);
610 bio = BIO_new(BIO_s_mem());
613 BIO_set_mem_eof_return(bio, 0);
620 EVP_CIPHER_free(evp_cipher);
624 EVP_CIPHER_free(evp_cipher);
625 OPENSSL_clear_free(ek, eklen);
626 OPENSSL_clear_free(tkey, tkeylen);
634 static BIO *PKCS7_find_digest(EVP_MD_CTX **pmd, BIO *bio, int nid)
637 bio = BIO_find_type(bio, BIO_TYPE_MD);
639 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST,
640 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
643 BIO_get_md_ctx(bio, pmd);
645 PKCS7err(PKCS7_F_PKCS7_FIND_DIGEST, ERR_R_INTERNAL_ERROR);
648 if (EVP_MD_CTX_type(*pmd) == nid)
655 static int do_pkcs7_signed_attrib(PKCS7_SIGNER_INFO *si, EVP_MD_CTX *mctx)
657 unsigned char md_data[EVP_MAX_MD_SIZE];
660 /* Add signing time if not already present */
661 if (!PKCS7_get_signed_attribute(si, NID_pkcs9_signingTime)) {
662 if (!PKCS7_add0_attrib_signing_time(si, NULL)) {
663 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
669 if (!EVP_DigestFinal_ex(mctx, md_data, &md_len)) {
670 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_EVP_LIB);
673 if (!PKCS7_add1_attrib_digest(si, md_data, md_len)) {
674 PKCS7err(PKCS7_F_DO_PKCS7_SIGNED_ATTRIB, ERR_R_MALLOC_FAILURE);
678 /* Now sign the attributes */
679 if (!PKCS7_SIGNER_INFO_sign(si))
685 int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
690 PKCS7_SIGNER_INFO *si;
691 EVP_MD_CTX *mdc, *ctx_tmp;
692 STACK_OF(X509_ATTRIBUTE) *sk;
693 STACK_OF(PKCS7_SIGNER_INFO) *si_sk = NULL;
694 ASN1_OCTET_STRING *os = NULL;
695 const PKCS7_CTX *p7_ctx;
698 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
702 p7_ctx = pkcs7_get0_ctx(p7);
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_with_libctx(ctx_tmp, abuf, &abuflen, si->pkey,
812 p7_ctx->libctx, p7_ctx->propq)) {
814 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, ERR_R_EVP_LIB);
817 ASN1_STRING_set0(si->enc_digest, abuf, abuflen);
820 } else if (i == NID_pkcs7_digest) {
821 unsigned char md_data[EVP_MAX_MD_SIZE];
823 if (!PKCS7_find_digest(&mdc, bio,
824 OBJ_obj2nid(p7->d.digest->md->algorithm)))
826 if (!EVP_DigestFinal_ex(mdc, md_data, &md_len))
828 if (!ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len))
832 if (!PKCS7_is_detached(p7)) {
834 * NOTE(emilia): I think we only reach os == NULL here because detached
835 * digested data support is broken.
839 if (!(os->flags & ASN1_STRING_FLAG_NDEF)) {
842 btmp = BIO_find_type(bio, BIO_TYPE_MEM);
844 PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
847 contlen = BIO_get_mem_data(btmp, &cont);
849 * Mark the BIO read only then we can use its copy of the data
850 * instead of making an extra copy.
852 BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
853 BIO_set_mem_eof_return(btmp, 0);
854 ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
859 EVP_MD_CTX_free(ctx_tmp);
863 int PKCS7_SIGNER_INFO_sign(PKCS7_SIGNER_INFO *si)
866 EVP_PKEY_CTX *pctx = NULL;
867 unsigned char *abuf = NULL;
870 const EVP_MD *md = NULL;
871 const PKCS7_CTX *ctx = si->ctx;
873 md = EVP_get_digestbyobj(si->digest_alg->algorithm);
877 mctx = EVP_MD_CTX_new();
879 PKCS7err(0, ERR_R_MALLOC_FAILURE);
883 if (EVP_DigestSignInit_with_libctx(mctx, &pctx,
884 EVP_MD_name(md), ctx->libctx, ctx->propq,
889 * TODO(3.0): This causes problems when providers are in use, so disabled
890 * for now. Can we get rid of this completely? AFAICT this ctrl has never
891 * been used since it was first put in. All internal implementations just
892 * return 1 and ignore this ctrl and have always done so by the looks of
893 * things. To fix this we could convert this ctrl into a param, which would
894 * require us to send all the signer info data as a set of params...but that
895 * is non-trivial and since this isn't used by anything it may be better
896 * just to remove it. The original commit that added it had this
897 * justification in CHANGES:
899 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
900 * EVP_PKEY_METHOD before and after signing via the
901 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
902 * before and/or after signing if necessary."
905 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
906 EVP_PKEY_CTRL_PKCS7_SIGN, 0, si) <= 0) {
907 PKCS7err(0, PKCS7_R_CTRL_ERROR);
912 alen = ASN1_item_i2d((ASN1_VALUE *)si->auth_attr, &abuf,
913 ASN1_ITEM_rptr(PKCS7_ATTR_SIGN));
916 if (EVP_DigestSignUpdate(mctx, abuf, alen) <= 0)
920 if (EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0)
922 abuf = OPENSSL_malloc(siglen);
925 if (EVP_DigestSignFinal(mctx, abuf, &siglen) <= 0)
929 * TODO(3.0): This causes problems when providers are in use, so disabled
930 * for now. Can we get rid of this completely? AFAICT this ctrl has never
931 * been used since it was first put in. All internal implementations just
932 * return 1 and ignore this ctrl and have always done so by the looks of
933 * things. To fix this we could convert this ctrl into a param, which would
934 * require us to send all the signer info data as a set of params...but that
935 * is non-trivial and since this isn't used by anything it may be better
936 * just to remove it. The original commit that added it had this
937 * justification in CHANGES:
939 * "During PKCS7 signing pass the PKCS7 SignerInfo structure to the
940 * EVP_PKEY_METHOD before and after signing via the
941 * EVP_PKEY_CTRL_PKCS7_SIGN ctrl. It can then customise the structure
942 * before and/or after signing if necessary."
945 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN,
946 EVP_PKEY_CTRL_PKCS7_SIGN, 1, si) <= 0) {
947 PKCS7err(0, PKCS7_R_CTRL_ERROR);
952 EVP_MD_CTX_free(mctx);
954 ASN1_STRING_set0(si->enc_digest, abuf, siglen);
960 EVP_MD_CTX_free(mctx);
964 int PKCS7_dataVerify(X509_STORE *cert_store, X509_STORE_CTX *ctx, BIO *bio,
965 PKCS7 *p7, PKCS7_SIGNER_INFO *si)
967 PKCS7_ISSUER_AND_SERIAL *ias;
969 STACK_OF(X509) *cert;
973 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
977 if (p7->d.ptr == NULL) {
978 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
982 if (PKCS7_type_is_signed(p7)) {
983 cert = p7->d.sign->cert;
984 } else if (PKCS7_type_is_signedAndEnveloped(p7)) {
985 cert = p7->d.signed_and_enveloped->cert;
987 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
990 /* XXXXXXXXXXXXXXXXXXXXXXX */
991 ias = si->issuer_and_serial;
993 x509 = X509_find_by_issuer_and_serial(cert, ias->issuer, ias->serial);
995 /* were we able to find the cert in passed to us */
997 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY,
998 PKCS7_R_UNABLE_TO_FIND_CERTIFICATE);
1003 if (!X509_STORE_CTX_init(ctx, cert_store, x509, cert)) {
1004 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1007 X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_SMIME_SIGN);
1008 i = X509_verify_cert(ctx);
1010 PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, ERR_R_X509_LIB);
1011 X509_STORE_CTX_cleanup(ctx);
1014 X509_STORE_CTX_cleanup(ctx);
1016 return PKCS7_signatureVerify(bio, p7, si, x509);
1021 int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si,
1024 ASN1_OCTET_STRING *os;
1025 EVP_MD_CTX *mdc_tmp, *mdc;
1026 EVP_MD *fetched_md = NULL;
1029 STACK_OF(X509_ATTRIBUTE) *sk;
1032 const PKCS7_CTX *ctx = pkcs7_get0_ctx(p7);
1034 mdc_tmp = EVP_MD_CTX_new();
1035 if (mdc_tmp == NULL) {
1036 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_MALLOC_FAILURE);
1040 if (!PKCS7_type_is_signed(p7) && !PKCS7_type_is_signedAndEnveloped(p7)) {
1041 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_WRONG_PKCS7_TYPE);
1045 md_type = OBJ_obj2nid(si->digest_alg->algorithm);
1049 if ((btmp == NULL) ||
1050 ((btmp = BIO_find_type(btmp, BIO_TYPE_MD)) == NULL)) {
1051 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1052 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1055 BIO_get_md_ctx(btmp, &mdc);
1057 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_INTERNAL_ERROR);
1060 if (EVP_MD_CTX_type(mdc) == md_type)
1063 * Workaround for some broken clients that put the signature OID
1064 * instead of the digest OID in digest_alg->algorithm
1066 if (EVP_MD_pkey_type(EVP_MD_CTX_md(mdc)) == md_type)
1068 btmp = BIO_next(btmp);
1072 * mdc is the digest ctx that we want, unless there are attributes, in
1073 * which case the digest is the signed attributes
1075 if (!EVP_MD_CTX_copy_ex(mdc_tmp, mdc))
1079 if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) {
1080 unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL;
1081 unsigned int md_len;
1083 ASN1_OCTET_STRING *message_digest;
1085 if (!EVP_DigestFinal_ex(mdc_tmp, md_dat, &md_len))
1087 message_digest = PKCS7_digest_from_attributes(sk);
1088 if (!message_digest) {
1089 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY,
1090 PKCS7_R_UNABLE_TO_FIND_MESSAGE_DIGEST);
1093 if ((message_digest->length != (int)md_len) ||
1094 (memcmp(message_digest->data, md_dat, md_len))) {
1095 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_DIGEST_FAILURE);
1100 fetched_md = EVP_MD_fetch(ctx->libctx, OBJ_nid2sn(md_type), ctx->propq);
1101 if (fetched_md == NULL || !EVP_VerifyInit_ex(mdc_tmp, fetched_md, NULL))
1104 alen = ASN1_item_i2d((ASN1_VALUE *)sk, &abuf,
1105 ASN1_ITEM_rptr(PKCS7_ATTR_VERIFY));
1107 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, ERR_R_ASN1_LIB);
1111 if (!EVP_VerifyUpdate(mdc_tmp, abuf, alen))
1117 os = si->enc_digest;
1118 pkey = X509_get0_pubkey(x509);
1124 i = EVP_VerifyFinal_with_libctx(mdc_tmp, os->data, os->length, pkey,
1125 ctx->libctx, ctx->propq);
1127 PKCS7err(PKCS7_F_PKCS7_SIGNATUREVERIFY, PKCS7_R_SIGNATURE_FAILURE);
1133 EVP_MD_CTX_free(mdc_tmp);
1134 EVP_MD_free(fetched_md);
1138 PKCS7_ISSUER_AND_SERIAL *PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
1140 STACK_OF(PKCS7_RECIP_INFO) *rsk;
1141 PKCS7_RECIP_INFO *ri;
1144 i = OBJ_obj2nid(p7->type);
1145 if (i != NID_pkcs7_signedAndEnveloped)
1147 if (p7->d.signed_and_enveloped == NULL)
1149 rsk = p7->d.signed_and_enveloped->recipientinfo;
1152 if (sk_PKCS7_RECIP_INFO_num(rsk) <= idx)
1154 ri = sk_PKCS7_RECIP_INFO_value(rsk, idx);
1155 return ri->issuer_and_serial;
1158 ASN1_TYPE *PKCS7_get_signed_attribute(PKCS7_SIGNER_INFO *si, int nid)
1160 return get_attribute(si->auth_attr, nid);
1163 ASN1_TYPE *PKCS7_get_attribute(PKCS7_SIGNER_INFO *si, int nid)
1165 return get_attribute(si->unauth_attr, nid);
1168 static ASN1_TYPE *get_attribute(STACK_OF(X509_ATTRIBUTE) *sk, int nid)
1172 idx = X509at_get_attr_by_NID(sk, nid, -1);
1173 xa = X509at_get_attr(sk, idx);
1174 return X509_ATTRIBUTE_get0_type(xa, 0);
1177 ASN1_OCTET_STRING *PKCS7_digest_from_attributes(STACK_OF(X509_ATTRIBUTE) *sk)
1180 if ((astype = get_attribute(sk, NID_pkcs9_messageDigest)) == NULL)
1182 return astype->value.octet_string;
1185 int PKCS7_set_signed_attributes(PKCS7_SIGNER_INFO *p7si,
1186 STACK_OF(X509_ATTRIBUTE) *sk)
1190 sk_X509_ATTRIBUTE_pop_free(p7si->auth_attr, X509_ATTRIBUTE_free);
1191 p7si->auth_attr = sk_X509_ATTRIBUTE_dup(sk);
1192 if (p7si->auth_attr == NULL)
1194 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1195 if ((sk_X509_ATTRIBUTE_set(p7si->auth_attr, i,
1196 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1204 int PKCS7_set_attributes(PKCS7_SIGNER_INFO *p7si,
1205 STACK_OF(X509_ATTRIBUTE) *sk)
1209 sk_X509_ATTRIBUTE_pop_free(p7si->unauth_attr, X509_ATTRIBUTE_free);
1210 p7si->unauth_attr = sk_X509_ATTRIBUTE_dup(sk);
1211 if (p7si->unauth_attr == NULL)
1213 for (i = 0; i < sk_X509_ATTRIBUTE_num(sk); i++) {
1214 if ((sk_X509_ATTRIBUTE_set(p7si->unauth_attr, i,
1215 X509_ATTRIBUTE_dup(sk_X509_ATTRIBUTE_value
1223 int PKCS7_add_signed_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1226 return add_attribute(&(p7si->auth_attr), nid, atrtype, value);
1229 int PKCS7_add_attribute(PKCS7_SIGNER_INFO *p7si, int nid, int atrtype,
1232 return add_attribute(&(p7si->unauth_attr), nid, atrtype, value);
1235 static int add_attribute(STACK_OF(X509_ATTRIBUTE) **sk, int nid, int atrtype,
1238 X509_ATTRIBUTE *attr = NULL;
1241 if ((*sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
1244 if ((attr = X509_ATTRIBUTE_create(nid, atrtype, value)) == NULL)
1246 if (!sk_X509_ATTRIBUTE_push(*sk, attr)) {
1247 X509_ATTRIBUTE_free(attr);
1253 for (i = 0; i < sk_X509_ATTRIBUTE_num(*sk); i++) {
1254 attr = sk_X509_ATTRIBUTE_value(*sk, i);
1255 if (OBJ_obj2nid(X509_ATTRIBUTE_get0_object(attr)) == nid) {
1256 X509_ATTRIBUTE_free(attr);
1257 attr = X509_ATTRIBUTE_create(nid, atrtype, value);
1260 if (!sk_X509_ATTRIBUTE_set(*sk, i, attr)) {
1261 X509_ATTRIBUTE_free(attr);