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>
16 #include "pk7_local.h"
18 #define BUFFERSIZE 4096
20 DEFINE_STACK_OF(PKCS7_SIGNER_INFO)
22 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
24 PKCS7 *PKCS7_sign_with_libctx(X509 *signcert, EVP_PKEY *pkey,
25 STACK_OF(X509) *certs, BIO *data, int flags,
26 OPENSSL_CTX *libctx, const char *propq)
31 if ((p7 = PKCS7_new_with_libctx(libctx, propq)) == NULL) {
32 PKCS7err(0, ERR_R_MALLOC_FAILURE);
36 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
39 if (!PKCS7_content_new(p7, NID_pkcs7_data))
42 if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
43 PKCS7err(0, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
47 if (!(flags & PKCS7_NOCERTS)) {
48 for (i = 0; i < sk_X509_num(certs); i++) {
49 if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
54 if (flags & PKCS7_DETACHED)
55 PKCS7_set_detached(p7, 1);
57 if (flags & (PKCS7_STREAM | PKCS7_PARTIAL))
60 if (PKCS7_final(p7, data, flags))
68 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
71 return PKCS7_sign_with_libctx(signcert, pkey, certs, data, flags, NULL, NULL);
75 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
80 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
81 PKCS7err(PKCS7_F_PKCS7_FINAL, ERR_R_MALLOC_FAILURE);
85 SMIME_crlf_copy(data, p7bio, flags);
87 (void)BIO_flush(p7bio);
89 if (!PKCS7_dataFinal(p7, p7bio)) {
90 PKCS7err(PKCS7_F_PKCS7_FINAL, PKCS7_R_PKCS7_DATASIGN);
101 /* Check to see if a cipher exists and if so add S/MIME capabilities */
103 static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
105 if (EVP_get_cipherbynid(nid))
106 return PKCS7_simple_smimecap(sk, nid, arg);
110 static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
112 if (EVP_get_digestbynid(nid))
113 return PKCS7_simple_smimecap(sk, nid, arg);
117 PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
118 EVP_PKEY *pkey, const EVP_MD *md,
121 PKCS7_SIGNER_INFO *si = NULL;
122 STACK_OF(X509_ALGOR) *smcap = NULL;
124 if (!X509_check_private_key(signcert, pkey)) {
125 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
126 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
130 if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
131 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
132 PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
136 si->ctx = pkcs7_get0_ctx(p7);
137 if (!(flags & PKCS7_NOCERTS)) {
138 if (!PKCS7_add_certificate(p7, signcert))
142 if (!(flags & PKCS7_NOATTR)) {
143 if (!PKCS7_add_attrib_content_type(si, NULL))
145 /* Add SMIMECapabilities */
146 if (!(flags & PKCS7_NOSMIMECAP)) {
147 if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
148 PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER, ERR_R_MALLOC_FAILURE);
151 if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
152 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
153 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
154 || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
155 || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
156 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
157 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
158 || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
159 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
160 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
161 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
162 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
163 || !PKCS7_add_attrib_smimecap(si, smcap))
165 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
168 if (flags & PKCS7_REUSE_DIGEST) {
169 if (!pkcs7_copy_existing_digest(p7, si))
171 if (!(flags & PKCS7_PARTIAL)
172 && !PKCS7_SIGNER_INFO_sign(si))
178 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
183 * Search for a digest matching SignerInfo digest type and if found copy
187 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
190 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
191 PKCS7_SIGNER_INFO *sitmp;
192 ASN1_OCTET_STRING *osdig = NULL;
193 sinfos = PKCS7_get_signer_info(p7);
194 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
195 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
198 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
200 if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
201 osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
208 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
210 PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
211 PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
215 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
216 BIO *indata, BIO *out, int flags)
218 STACK_OF(X509) *signers;
220 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
221 PKCS7_SIGNER_INFO *si;
222 X509_STORE_CTX *cert_ctx = NULL;
224 int i, j = 0, k, ret = 0;
226 BIO *tmpin = NULL, *tmpout = NULL;
227 const PKCS7_CTX *p7_ctx;
230 PKCS7err(0, PKCS7_R_INVALID_NULL_POINTER);
234 if (!PKCS7_type_is_signed(p7)) {
235 PKCS7err(0, PKCS7_R_WRONG_CONTENT_TYPE);
239 /* Check for no data and no content: no data to verify signature */
240 if (PKCS7_get_detached(p7) && !indata) {
241 PKCS7err(0, PKCS7_R_NO_CONTENT);
245 if (flags & PKCS7_NO_DUAL_CONTENT) {
247 * This was originally "#if 0" because we thought that only old broken
248 * Netscape did this. It turns out that Authenticode uses this kind
249 * of "extended" PKCS7 format, and things like UEFI secure boot and
250 * tools like osslsigncode need it. In Authenticode the verification
251 * process is different, but the existing PKCs7 verification works.
253 if (!PKCS7_get_detached(p7) && indata) {
254 PKCS7err(0, PKCS7_R_CONTENT_AND_DATA_PRESENT);
259 sinfos = PKCS7_get_signer_info(p7);
261 if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
262 PKCS7err(0, PKCS7_R_NO_SIGNATURES_ON_DATA);
266 signers = PKCS7_get0_signers(p7, certs, flags);
270 /* Now verify the certificates */
271 p7_ctx = pkcs7_get0_ctx(p7);
272 cert_ctx = X509_STORE_CTX_new_with_libctx(p7_ctx->libctx, p7_ctx->propq);
273 if (cert_ctx == NULL)
275 if (!(flags & PKCS7_NOVERIFY))
276 for (k = 0; k < sk_X509_num(signers); k++) {
277 signer = sk_X509_value(signers, k);
278 if (!(flags & PKCS7_NOCHAIN)) {
279 if (!X509_STORE_CTX_init(cert_ctx, store, signer,
281 PKCS7err(0, ERR_R_X509_LIB);
284 X509_STORE_CTX_set_default(cert_ctx, "smime_sign");
285 } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
286 PKCS7err(0, ERR_R_X509_LIB);
289 if (!(flags & PKCS7_NOCRL))
290 X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
291 i = X509_verify_cert(cert_ctx);
293 j = X509_STORE_CTX_get_error(cert_ctx);
294 X509_STORE_CTX_cleanup(cert_ctx);
296 PKCS7err(0, PKCS7_R_CERTIFICATE_VERIFY_ERROR);
297 ERR_add_error_data(2, "Verify error:",
298 X509_verify_cert_error_string(j));
301 /* Check for revocation status here */
305 * Performance optimization: if the content is a memory BIO then store
306 * its contents in a temporary read only memory BIO. This avoids
307 * potentially large numbers of slow copies of data which will occur when
308 * reading from a read write memory BIO when signatures are calculated.
311 if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
314 len = BIO_get_mem_data(indata, &ptr);
315 tmpin = BIO_new_mem_buf(ptr, len);
317 PKCS7err(0, ERR_R_MALLOC_FAILURE);
323 if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL)
326 if (flags & PKCS7_TEXT) {
327 if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
328 PKCS7err(0, ERR_R_MALLOC_FAILURE);
331 BIO_set_mem_eof_return(tmpout, 0);
335 /* We now have to 'read' from p7bio to calculate digests etc. */
336 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
337 PKCS7err(0, ERR_R_MALLOC_FAILURE);
341 i = BIO_read(p7bio, buf, BUFFERSIZE);
345 BIO_write(tmpout, buf, i);
348 if (flags & PKCS7_TEXT) {
349 if (!SMIME_text(tmpout, out)) {
350 PKCS7err(0, PKCS7_R_SMIME_TEXT_ERROR);
357 /* Now Verify All Signatures */
358 if (!(flags & PKCS7_NOSIGS))
359 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
360 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
361 signer = sk_X509_value(signers, i);
362 j = PKCS7_signatureVerify(p7bio, p7, si, signer);
364 PKCS7err(0, PKCS7_R_SIGNATURE_FAILURE);
372 X509_STORE_CTX_free(cert_ctx);
374 if (tmpin == indata) {
379 sk_X509_free(signers);
383 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
386 STACK_OF(X509) *signers;
387 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
388 PKCS7_SIGNER_INFO *si;
389 PKCS7_ISSUER_AND_SERIAL *ias;
394 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_INVALID_NULL_POINTER);
398 if (!PKCS7_type_is_signed(p7)) {
399 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_WRONG_CONTENT_TYPE);
403 /* Collect all the signers together */
405 sinfos = PKCS7_get_signer_info(p7);
407 if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
408 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, PKCS7_R_NO_SIGNERS);
412 if ((signers = sk_X509_new_null()) == NULL) {
413 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS, ERR_R_MALLOC_FAILURE);
417 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
418 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
419 ias = si->issuer_and_serial;
421 /* If any certificates passed they take priority */
423 signer = X509_find_by_issuer_and_serial(certs,
424 ias->issuer, ias->serial);
425 if (!signer && !(flags & PKCS7_NOINTERN)
428 X509_find_by_issuer_and_serial(p7->d.sign->cert,
429 ias->issuer, ias->serial);
431 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,
432 PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
433 sk_X509_free(signers);
437 if (!sk_X509_push(signers, signer)) {
438 sk_X509_free(signers);
445 /* Build a complete PKCS#7 enveloped data */
447 PKCS7 *PKCS7_encrypt_with_libctx(STACK_OF(X509) *certs, BIO *in,
448 const EVP_CIPHER *cipher, int flags,
449 OPENSSL_CTX *libctx, const char *propq)
456 if ((p7 = PKCS7_new_with_libctx(libctx, propq)) == NULL) {
457 PKCS7err(0, ERR_R_MALLOC_FAILURE);
461 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
463 if (!PKCS7_set_cipher(p7, cipher)) {
464 PKCS7err(0, PKCS7_R_ERROR_SETTING_CIPHER);
468 for (i = 0; i < sk_X509_num(certs); i++) {
469 x509 = sk_X509_value(certs, i);
470 if (!PKCS7_add_recipient(p7, x509)) {
471 PKCS7err(0, PKCS7_R_ERROR_ADDING_RECIPIENT);
476 if (flags & PKCS7_STREAM)
479 if (PKCS7_final(p7, in, flags))
490 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
493 return PKCS7_encrypt_with_libctx(certs, in, cipher, flags, NULL, NULL);
497 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
504 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_INVALID_NULL_POINTER);
508 if (!PKCS7_type_is_enveloped(p7)) {
509 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_WRONG_CONTENT_TYPE);
513 if (cert && !X509_check_private_key(cert, pkey)) {
514 PKCS7err(PKCS7_F_PKCS7_DECRYPT,
515 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
519 if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
520 PKCS7err(PKCS7_F_PKCS7_DECRYPT, PKCS7_R_DECRYPT_ERROR);
524 if (flags & PKCS7_TEXT) {
526 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
527 if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
528 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
529 BIO_free_all(tmpmem);
532 if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
533 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
534 BIO_free_all(tmpbuf);
535 BIO_free_all(tmpmem);
538 ret = SMIME_text(bread, data);
539 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
540 if (!BIO_get_cipher_status(tmpmem))
546 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
547 PKCS7err(PKCS7_F_PKCS7_DECRYPT, ERR_R_MALLOC_FAILURE);
551 i = BIO_read(tmpmem, buf, BUFFERSIZE);
554 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
555 if (!BIO_get_cipher_status(tmpmem))
561 if (BIO_write(data, buf, i) != i) {
567 BIO_free_all(tmpmem);