2 * Copyright 1999-2020 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
10 /* Simple PKCS#7 processing functions */
13 #include "internal/cryptlib.h"
14 #include <openssl/x509.h>
15 #include <openssl/x509v3.h>
17 #define BUFFERSIZE 4096
20 DEFINE_STACK_OF(X509_ATTRIBUTE)
21 DEFINE_STACK_OF(X509_ALGOR)
22 DEFINE_STACK_OF(PKCS7_SIGNER_INFO)
24 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
26 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
32 if ((p7 = PKCS7_new()) == NULL) {
33 PKCS7err(PKCS7_F_PKCS7_SIGN, ERR_R_MALLOC_FAILURE);
37 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
40 if (!PKCS7_content_new(p7, NID_pkcs7_data))
43 if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
44 PKCS7err(PKCS7_F_PKCS7_SIGN, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
48 if (!(flags & PKCS7_NOCERTS)) {
49 for (i = 0; i < sk_X509_num(certs); i++) {
50 if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
55 if (flags & PKCS7_DETACHED)
56 PKCS7_set_detached(p7, 1);
58 if (flags & (PKCS7_STREAM | PKCS7_PARTIAL))
61 if (PKCS7_final(p7, data, flags))
69 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
74 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
75 PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
79 SMIME_crlf_copy(data, p7bio, flags);
81 (void)BIO_flush(p7bio);
83 if (!PKCS7_dataFinal(p7, p7bio)) {
84 PKCS7err(PKCS7_F_PKCS7_FINAL, PKCS7_R_PKCS7_DATASIGN);
97 /* Check to see if a cipher exists and if so add S/MIME capabilities */
99 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
101 if (EVP_get_cipherbynid(nid))
102 return PKCS7_simple_smimecap(sk, nid, arg);
106 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
108 if (EVP_get_digestbynid(nid))
109 return PKCS7_simple_smimecap(sk, nid, arg);
113 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
114 EVP_PKEY *pkey, const EVP_MD *md,
117 PKCS7_SIGNER_INFO *si = NULL;
118 STACK_OF(X509_ALGOR) *smcap = NULL;
119 if (!X509_check_private_key(signcert, pkey)) {
120 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
121 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
125 if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
126 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
127 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
131 if (!(flags & PKCS7_NOCERTS)) {
132 if (!PKCS7_add_certificate(p7, signcert))
136 if (!(flags & PKCS7_NOATTR)) {
137 if (!PKCS7_add_attrib_content_type(si, NULL))
139 /* Add SMIMECapabilities */
140 if (!(flags & PKCS7_NOSMIMECAP)) {
141 if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
142 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
145 if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
146 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
147 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
148 || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
149 || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
150 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
151 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
152 || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
153 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
154 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
155 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
156 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
157 || !PKCS7_add_attrib_smimecap(si, smcap))
159 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
162 if (flags & PKCS7_REUSE_DIGEST) {
163 if (!pkcs7_copy_existing_digest(p7, si))
165 if (!(flags & PKCS7_PARTIAL) && !PKCS7_SIGNER_INFO_sign(si))
171 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
176 * Search for a digest matching SignerInfo digest type and if found copy
180 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
183 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
184 PKCS7_SIGNER_INFO *sitmp;
185 ASN1_OCTET_STRING *osdig = NULL;
186 sinfos = PKCS7_get_signer_info(p7);
187 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
188 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
191 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
193 if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
194 osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
201 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
203 PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
204 PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
208 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
209 BIO *indata, BIO *out, int flags)
211 STACK_OF(X509) *signers;
213 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
214 PKCS7_SIGNER_INFO *si;
215 X509_STORE_CTX *cert_ctx = NULL;
217 int i, j = 0, k, ret = 0;
219 BIO *tmpin = NULL, *tmpout = NULL;
222 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_INVALID_NULL_POINTER);
226 if (!PKCS7_type_is_signed(p7)) {
227 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_WRONG_CONTENT_TYPE);
231 /* Check for no data and no content: no data to verify signature */
232 if (PKCS7_get_detached(p7) && !indata) {
233 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_CONTENT);
237 if (flags & PKCS7_NO_DUAL_CONTENT) {
239 * This was originally "#if 0" because we thought that only old broken
240 * Netscape did this. It turns out that Authenticode uses this kind
241 * of "extended" PKCS7 format, and things like UEFI secure boot and
242 * tools like osslsigncode need it. In Authenticode the verification
243 * process is different, but the existing PKCs7 verification works.
245 if (!PKCS7_get_detached(p7) && indata) {
246 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_CONTENT_AND_DATA_PRESENT);
251 sinfos = PKCS7_get_signer_info(p7);
253 if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
254 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_NO_SIGNATURES_ON_DATA);
258 signers = PKCS7_get0_signers(p7, certs, flags);
262 /* Now verify the certificates */
264 cert_ctx = X509_STORE_CTX_new();
265 if (cert_ctx == NULL)
267 if (!(flags & PKCS7_NOVERIFY))
268 for (k = 0; k < sk_X509_num(signers); k++) {
269 signer = sk_X509_value(signers, k);
270 if (!(flags & PKCS7_NOCHAIN)) {
271 if (!X509_STORE_CTX_init(cert_ctx, store, signer,
273 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
276 X509_STORE_CTX_set_default(cert_ctx, "smime_sign");
277 } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
278 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_X509_LIB);
281 if (!(flags & PKCS7_NOCRL))
282 X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
283 i = X509_verify_cert(cert_ctx);
285 j = X509_STORE_CTX_get_error(cert_ctx);
286 X509_STORE_CTX_cleanup(cert_ctx);
288 PKCS7err(PKCS7_F_PKCS7_VERIFY,
289 PKCS7_R_CERTIFICATE_VERIFY_ERROR);
290 ERR_add_error_data(2, "Verify error:",
291 X509_verify_cert_error_string(j));
294 /* Check for revocation status here */
298 * Performance optimization: if the content is a memory BIO then store
299 * its contents in a temporary read only memory BIO. This avoids
300 * potentially large numbers of slow copies of data which will occur when
301 * reading from a read write memory BIO when signatures are calculated.
304 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
307 len = BIO_get_mem_data(indata, &ptr);
308 tmpin = BIO_new_mem_buf(ptr, len);
310 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
316 if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL)
319 if (flags & PKCS7_TEXT) {
320 if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
321 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
324 BIO_set_mem_eof_return(tmpout, 0);
328 /* We now have to 'read' from p7bio to calculate digests etc. */
329 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
330 PKCS7err(PKCS7_F_PKCS7_VERIFY, ERR_R_MALLOC_FAILURE);
334 i = BIO_read(p7bio, buf, BUFFERSIZE);
338 BIO_write(tmpout, buf, i);
341 if (flags & PKCS7_TEXT) {
342 if (!SMIME_text(tmpout, out)) {
343 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SMIME_TEXT_ERROR);
350 /* Now Verify All Signatures */
351 if (!(flags & PKCS7_NOSIGS))
352 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
353 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
354 signer = sk_X509_value(signers, i);
355 j = PKCS7_signatureVerify(p7bio, p7, si, signer);
357 PKCS7err(PKCS7_F_PKCS7_VERIFY, PKCS7_R_SIGNATURE_FAILURE);
365 X509_STORE_CTX_free(cert_ctx);
367 if (tmpin == indata) {
372 sk_X509_free(signers);
376 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
379 STACK_OF(X509) *signers;
380 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
381 PKCS7_SIGNER_INFO *si;
382 PKCS7_ISSUER_AND_SERIAL *ias;
387 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
391 if (!PKCS7_type_is_signed(p7)) {
392 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_WRONG_CONTENT_TYPE);
396 /* Collect all the signers together */
398 sinfos = PKCS7_get_signer_info(p7);
400 if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
401 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
405 if ((signers = sk_X509_new_null()) == NULL) {
406 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
410 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
411 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
412 ias = si->issuer_and_serial;
414 /* If any certificates passed they take priority */
416 signer = X509_find_by_issuer_and_serial(certs,
417 ias->issuer, ias->serial);
418 if (!signer && !(flags & PKCS7_NOINTERN)
421 X509_find_by_issuer_and_serial(p7->d.sign->cert,
422 ias->issuer, ias->serial);
424 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
425 PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
426 sk_X509_free(signers);
430 if (!sk_X509_push(signers, signer)) {
431 sk_X509_free(signers);
438 /* Build a complete PKCS#7 enveloped data */
440 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
447 if ((p7 = PKCS7_new()) == NULL) {
448 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, ERR_R_MALLOC_FAILURE);
452 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
454 if (!PKCS7_set_cipher(p7, cipher)) {
455 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_SETTING_CIPHER);
459 for (i = 0; i < sk_X509_num(certs); i++) {
460 x509 = sk_X509_value(certs, i);
461 if (!PKCS7_add_recipient(p7, x509)) {
462 PKCS7err(PKCS7_F_PKCS7_ENCRYPT, PKCS7_R_ERROR_ADDING_RECIPIENT);
467 if (flags & PKCS7_STREAM)
470 if (PKCS7_final(p7, in, flags))
481 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
488 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
492 if (!PKCS7_type_is_enveloped(p7)) {
493 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
497 if (cert && !X509_check_private_key(cert, pkey)) {
498 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
499 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
503 if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
504 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
508 if (flags & PKCS7_TEXT) {
510 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
511 if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
512 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
513 BIO_free_all(tmpmem);
516 if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
517 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
518 BIO_free_all(tmpbuf);
519 BIO_free_all(tmpmem);
522 ret = SMIME_text(bread, data);
523 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
524 if (!BIO_get_cipher_status(tmpmem))
530 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
531 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
535 i = BIO_read(tmpmem, buf, BUFFERSIZE);
538 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
539 if (!BIO_get_cipher_status(tmpmem))
545 if (BIO_write(data, buf, i) != i) {
551 BIO_free_all(tmpmem);