2 * Copyright 1999-2021 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
21 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
23 PKCS7 *PKCS7_sign_ex(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
24 BIO *data, int flags, OSSL_LIB_CTX *libctx,
30 if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
31 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
35 if (!PKCS7_set_type(p7, NID_pkcs7_signed))
38 if (!PKCS7_content_new(p7, NID_pkcs7_data))
41 if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
42 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
46 if (!(flags & PKCS7_NOCERTS)) {
47 for (i = 0; i < sk_X509_num(certs); i++) {
48 if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
53 if (flags & PKCS7_DETACHED)
54 PKCS7_set_detached(p7, 1);
56 if (flags & (PKCS7_STREAM | PKCS7_PARTIAL))
59 if (PKCS7_final(p7, data, flags))
67 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
70 return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
74 int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
79 if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
80 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
84 if (!SMIME_crlf_copy(data, p7bio, flags))
87 (void)BIO_flush(p7bio);
89 if (!PKCS7_dataFinal(p7, p7bio)) {
90 ERR_raise(ERR_LIB_PKCS7, 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 ERR_raise(ERR_LIB_PKCS7,
126 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
130 if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
131 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
135 si->ctx = ossl_pkcs7_get0_ctx(p7);
136 if (!(flags & PKCS7_NOCERTS)) {
137 if (!PKCS7_add_certificate(p7, signcert))
141 if (!(flags & PKCS7_NOATTR)) {
142 if (!PKCS7_add_attrib_content_type(si, NULL))
144 /* Add SMIMECapabilities */
145 if (!(flags & PKCS7_NOSMIMECAP)) {
146 if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
147 ERR_raise(ERR_LIB_PKCS7, ERR_R_CRYPTO_LIB);
150 if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
151 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
152 || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
153 || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
154 || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
155 || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
156 || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
157 || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
158 || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
159 || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
160 || !add_cipher_smcap(smcap, NID_des_cbc, -1)
161 || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
162 || !PKCS7_add_attrib_smimecap(si, smcap))
164 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
167 if (flags & PKCS7_REUSE_DIGEST) {
168 if (!pkcs7_copy_existing_digest(p7, si))
170 if (!(flags & PKCS7_PARTIAL)
171 && !PKCS7_SIGNER_INFO_sign(si))
177 sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
182 * Search for a digest matching SignerInfo digest type and if found copy
186 static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
189 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
190 PKCS7_SIGNER_INFO *sitmp;
191 ASN1_OCTET_STRING *osdig = NULL;
192 sinfos = PKCS7_get_signer_info(p7);
193 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
194 sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
197 if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
199 if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
200 osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
207 return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
209 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
213 /* This strongly overlaps with CMS_verify(), partly with PKCS7_dataVerify() */
214 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
215 BIO *indata, BIO *out, int flags)
217 STACK_OF(X509) *signers;
219 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
220 PKCS7_SIGNER_INFO *si;
221 X509_STORE_CTX *cert_ctx = NULL;
223 int i, j = 0, k, ret = 0;
226 const PKCS7_CTX *p7_ctx;
229 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
233 if (!PKCS7_type_is_signed(p7)) {
234 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
238 /* Check for no data and no content: no data to verify signature */
239 if (PKCS7_get_detached(p7) && indata == NULL) {
240 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
244 if (flags & PKCS7_NO_DUAL_CONTENT) {
246 * This was originally "#if 0" because we thought that only old broken
247 * Netscape did this. It turns out that Authenticode uses this kind
248 * of "extended" PKCS7 format, and things like UEFI secure boot and
249 * tools like osslsigncode need it. In Authenticode the verification
250 * process is different, but the existing PKCs7 verification works.
252 if (!PKCS7_get_detached(p7) && indata != NULL) {
253 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CONTENT_AND_DATA_PRESENT);
258 sinfos = PKCS7_get_signer_info(p7);
260 if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
261 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNATURES_ON_DATA);
265 signers = PKCS7_get0_signers(p7, certs, flags);
269 /* Now verify the certificates */
270 p7_ctx = ossl_pkcs7_get0_ctx(p7);
271 cert_ctx = X509_STORE_CTX_new_ex(ossl_pkcs7_ctx_get0_libctx(p7_ctx),
272 ossl_pkcs7_ctx_get0_propq(p7_ctx));
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 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
284 if (!X509_STORE_CTX_set_default(cert_ctx, "smime_sign"))
286 } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
287 ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
290 if (!(flags & PKCS7_NOCRL))
291 X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
292 i = X509_verify_cert(cert_ctx);
294 j = X509_STORE_CTX_get_error(cert_ctx);
296 ERR_raise_data(ERR_LIB_PKCS7, PKCS7_R_CERTIFICATE_VERIFY_ERROR,
298 X509_verify_cert_error_string(j));
301 /* Check for revocation status here */
304 if ((p7bio = PKCS7_dataInit(p7, indata)) == NULL)
307 if (flags & PKCS7_TEXT) {
308 if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
309 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
312 BIO_set_mem_eof_return(tmpout, 0);
316 /* We now have to 'read' from p7bio to calculate digests etc. */
317 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL)
320 i = BIO_read(p7bio, buf, BUFFERSIZE);
324 BIO_write(tmpout, buf, i);
327 if (flags & PKCS7_TEXT) {
328 if (!SMIME_text(tmpout, out)) {
329 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SMIME_TEXT_ERROR);
336 /* Now Verify All Signatures */
337 if (!(flags & PKCS7_NOSIGS))
338 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
339 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
340 signer = sk_X509_value(signers, i);
341 j = PKCS7_signatureVerify(p7bio, p7, si, signer);
343 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
351 X509_STORE_CTX_free(cert_ctx);
356 sk_X509_free(signers);
360 STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
363 STACK_OF(X509) *signers;
364 STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
365 PKCS7_SIGNER_INFO *si;
366 PKCS7_ISSUER_AND_SERIAL *ias;
371 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
375 if (!PKCS7_type_is_signed(p7)) {
376 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
380 /* Collect all the signers together */
382 sinfos = PKCS7_get_signer_info(p7);
384 if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
385 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNERS);
389 if ((signers = sk_X509_new_null()) == NULL) {
390 ERR_raise(ERR_LIB_PKCS7, ERR_R_CRYPTO_LIB);
394 for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
395 si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
396 ias = si->issuer_and_serial;
398 /* If any certificates passed they take priority */
400 signer = X509_find_by_issuer_and_serial(certs,
401 ias->issuer, ias->serial);
402 if (signer == NULL && !(flags & PKCS7_NOINTERN)
405 X509_find_by_issuer_and_serial(p7->d.sign->cert,
406 ias->issuer, ias->serial);
407 if (signer == NULL) {
408 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
409 sk_X509_free(signers);
413 if (!sk_X509_push(signers, signer)) {
414 sk_X509_free(signers);
421 /* Build a complete PKCS#7 enveloped data */
423 PKCS7 *PKCS7_encrypt_ex(STACK_OF(X509) *certs, BIO *in,
424 const EVP_CIPHER *cipher, int flags,
425 OSSL_LIB_CTX *libctx, const char *propq)
432 if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
433 ERR_raise(ERR_LIB_PKCS7, ERR_R_PKCS7_LIB);
437 if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
439 if (!PKCS7_set_cipher(p7, cipher)) {
440 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_SETTING_CIPHER);
444 for (i = 0; i < sk_X509_num(certs); i++) {
445 x509 = sk_X509_value(certs, i);
446 if (!PKCS7_add_recipient(p7, x509)) {
447 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_ADDING_RECIPIENT);
452 if (flags & PKCS7_STREAM)
455 if (PKCS7_final(p7, in, flags))
466 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
469 return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL);
473 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
480 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
484 if (!PKCS7_type_is_enveloped(p7)
485 && !PKCS7_type_is_signedAndEnveloped(p7)) {
486 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
490 if (cert && !X509_check_private_key(cert, pkey)) {
491 ERR_raise(ERR_LIB_PKCS7,
492 PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
496 if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
497 ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DECRYPT_ERROR);
501 if (flags & PKCS7_TEXT) {
503 /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
504 if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
505 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
506 BIO_free_all(tmpmem);
509 if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
510 ERR_raise(ERR_LIB_PKCS7, ERR_R_BIO_LIB);
511 BIO_free_all(tmpbuf);
512 BIO_free_all(tmpmem);
515 ret = SMIME_text(bread, data);
516 if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
517 if (BIO_get_cipher_status(tmpmem) <= 0)
523 if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL)
526 i = BIO_read(tmpmem, buf, BUFFERSIZE);
529 if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
530 if (BIO_get_cipher_status(tmpmem) <= 0)
536 if (BIO_write(data, buf, i) != i) {
542 BIO_free_all(tmpmem);