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src/lib/libcrypto/pkcs7/pk7_smime.c

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/* $OpenBSD: pk7_smime.c,v 1.27 2024/04/20 10:11:55 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
* Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* Simple PKCS#7 processing functions */
#include <stdio.h>
#include <openssl/err.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "x509_local.h"
static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
PKCS7 *
PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data,
int flags)
{
PKCS7 *p7;
int i;
if (!(p7 = PKCS7_new())) {
PKCS7error(ERR_R_MALLOC_FAILURE);
return NULL;
}
if (!PKCS7_set_type(p7, NID_pkcs7_signed))
goto err;
if (!PKCS7_content_new(p7, NID_pkcs7_data))
goto err;
if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
PKCS7error(PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
goto err;
}
if (!(flags & PKCS7_NOCERTS)) {
for (i = 0; i < sk_X509_num(certs); i++) {
if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
goto err;
}
}
if (flags & PKCS7_DETACHED)
PKCS7_set_detached(p7, 1);
if (flags & (PKCS7_STREAM|PKCS7_PARTIAL))
return p7;
if (PKCS7_final(p7, data, flags))
return p7;
err:
PKCS7_free(p7);
return NULL;
}
LCRYPTO_ALIAS(PKCS7_sign);
int
PKCS7_final(PKCS7 *p7, BIO *data, int flags)
{
BIO *p7bio;
int ret = 0;
if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
PKCS7error(ERR_R_MALLOC_FAILURE);
return 0;
}
SMIME_crlf_copy(data, p7bio, flags);
(void)BIO_flush(p7bio);
if (!PKCS7_dataFinal(p7, p7bio)) {
PKCS7error(PKCS7_R_PKCS7_DATASIGN);
goto err;
}
ret = 1;
err:
BIO_free_all(p7bio);
return ret;
}
LCRYPTO_ALIAS(PKCS7_final);
/* Check to see if a cipher exists and if so add S/MIME capabilities */
static int
add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
{
if (EVP_get_cipherbynid(nid))
return PKCS7_simple_smimecap(sk, nid, arg);
return 1;
}
PKCS7_SIGNER_INFO *
PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert, EVP_PKEY *pkey,
const EVP_MD *md, int flags)
{
PKCS7_SIGNER_INFO *si = NULL;
STACK_OF(X509_ALGOR) *smcap = NULL;
if (!X509_check_private_key(signcert, pkey)) {
PKCS7error(PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
return NULL;
}
if (!(si = PKCS7_add_signature(p7, signcert, pkey, md))) {
PKCS7error(PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
return NULL;
}
if (!(flags & PKCS7_NOCERTS)) {
if (!PKCS7_add_certificate(p7, signcert))
goto err;
}
if (!(flags & PKCS7_NOATTR)) {
if (!PKCS7_add_attrib_content_type(si, NULL))
goto err;
/* Add SMIMECapabilities */
if (!(flags & PKCS7_NOSMIMECAP)) {
if (!(smcap = sk_X509_ALGOR_new_null())) {
PKCS7error(ERR_R_MALLOC_FAILURE);
goto err;
}
if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1) ||
!add_cipher_smcap(smcap, NID_aes_192_cbc, -1) ||
!add_cipher_smcap(smcap, NID_aes_128_cbc, -1) ||
!add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) ||
!add_cipher_smcap(smcap, NID_rc2_cbc, 128) ||
!add_cipher_smcap(smcap, NID_rc2_cbc, 64) ||
!add_cipher_smcap(smcap, NID_des_cbc, -1) ||
!add_cipher_smcap(smcap, NID_rc2_cbc, 40) ||
!PKCS7_add_attrib_smimecap(si, smcap))
goto err;
sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
smcap = NULL;
}
if (flags & PKCS7_REUSE_DIGEST) {
if (!pkcs7_copy_existing_digest(p7, si))
goto err;
if (!(flags & PKCS7_PARTIAL) &&
!PKCS7_SIGNER_INFO_sign(si))
goto err;
}
}
return si;
err:
if (smcap)
sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
return NULL;
}
LCRYPTO_ALIAS(PKCS7_sign_add_signer);
/* Search for a digest matching SignerInfo digest type and if found
* copy across.
*/
static int
pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
{
int i;
STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
PKCS7_SIGNER_INFO *sitmp;
ASN1_OCTET_STRING *osdig = NULL;
sinfos = PKCS7_get_signer_info(p7);
for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
if (si == sitmp)
break;
if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
continue;
if (!OBJ_cmp(si->digest_alg->algorithm,
sitmp->digest_alg->algorithm)) {
osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
break;
}
}
if (osdig)
return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
PKCS7error(PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
return 0;
}
int
PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store, BIO *indata,
BIO *out, int flags)
{
STACK_OF(X509) *signers;
X509 *signer;
STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
PKCS7_SIGNER_INFO *si;
X509_STORE_CTX cert_ctx;
char buf[4096];
int i, j = 0, k, ret = 0;
BIO *p7bio;
BIO *tmpin, *tmpout;
if (!p7) {
PKCS7error(PKCS7_R_INVALID_NULL_POINTER);
return 0;
}
if (!PKCS7_type_is_signed(p7)) {
PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
return 0;
}
/* Check for no data and no content: no data to verify signature */
if (PKCS7_get_detached(p7) && !indata) {
PKCS7error(PKCS7_R_NO_CONTENT);
return 0;
}
/*
* Very old Netscape illegally included empty content with
* a detached signature. Very old users should upgrade.
*/
/* Check for data and content: two sets of data */
if (!PKCS7_get_detached(p7) && indata) {
PKCS7error(PKCS7_R_CONTENT_AND_DATA_PRESENT);
return 0;
}
sinfos = PKCS7_get_signer_info(p7);
if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
PKCS7error(PKCS7_R_NO_SIGNATURES_ON_DATA);
return 0;
}
signers = PKCS7_get0_signers(p7, certs, flags);
if (!signers)
return 0;
/* Now verify the certificates */
if (!(flags & PKCS7_NOVERIFY))
for (k = 0; k < sk_X509_num(signers); k++) {
signer = sk_X509_value (signers, k);
if (!(flags & PKCS7_NOCHAIN)) {
if (!X509_STORE_CTX_init(&cert_ctx, store,
signer, p7->d.sign->cert)) {
PKCS7error(ERR_R_X509_LIB);
sk_X509_free(signers);
return 0;
}
if (X509_STORE_CTX_set_default(&cert_ctx,
"smime_sign") == 0) {
sk_X509_free(signers);
return 0;
}
} else if (!X509_STORE_CTX_init(&cert_ctx, store,
signer, NULL)) {
PKCS7error(ERR_R_X509_LIB);
sk_X509_free(signers);
return 0;
}
if (!(flags & PKCS7_NOCRL))
X509_STORE_CTX_set0_crls(&cert_ctx, p7->d.sign->crl);
i = X509_verify_cert(&cert_ctx);
if (i <= 0)
j = X509_STORE_CTX_get_error(&cert_ctx);
X509_STORE_CTX_cleanup(&cert_ctx);
if (i <= 0) {
PKCS7error(PKCS7_R_CERTIFICATE_VERIFY_ERROR);
ERR_asprintf_error_data("Verify error:%s",
X509_verify_cert_error_string(j));
sk_X509_free(signers);
return 0;
}
/* Check for revocation status here */
}
/*
* Performance optimization: if the content is a memory BIO then
* store its contents in a temporary read only memory BIO. This
* avoids potentially large numbers of slow copies of data which will
* occur when reading from a read write memory BIO when signatures
* are calculated.
*/
if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
char *ptr;
long len;
len = BIO_get_mem_data(indata, &ptr);
tmpin = BIO_new_mem_buf(ptr, len);
if (tmpin == NULL) {
PKCS7error(ERR_R_MALLOC_FAILURE);
return 0;
}
} else
tmpin = indata;
if (!(p7bio = PKCS7_dataInit(p7, tmpin)))
goto err;
if (flags & PKCS7_TEXT) {
if (!(tmpout = BIO_new(BIO_s_mem()))) {
PKCS7error(ERR_R_MALLOC_FAILURE);
goto err;
}
BIO_set_mem_eof_return(tmpout, 0);
} else
tmpout = out;
/* We now have to 'read' from p7bio to calculate digests etc. */
for (;;) {
i = BIO_read(p7bio, buf, sizeof(buf));
if (i <= 0)
break;
if (tmpout)
BIO_write(tmpout, buf, i);
}
if (flags & PKCS7_TEXT) {
if (!SMIME_text(tmpout, out)) {
PKCS7error(PKCS7_R_SMIME_TEXT_ERROR);
BIO_free(tmpout);
goto err;
}
BIO_free(tmpout);
}
/* Now Verify All Signatures */
if (!(flags & PKCS7_NOSIGS))
for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
signer = sk_X509_value (signers, i);
j = PKCS7_signatureVerify(p7bio, p7, si, signer);
if (j <= 0) {
PKCS7error(PKCS7_R_SIGNATURE_FAILURE);
goto err;
}
}
ret = 1;
err:
if (tmpin == indata) {
if (indata)
BIO_pop(p7bio);
}
BIO_free_all(p7bio);
sk_X509_free(signers);
return ret;
}
LCRYPTO_ALIAS(PKCS7_verify);
STACK_OF(X509) *
PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags)
{
STACK_OF(X509) *signers;
STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
PKCS7_SIGNER_INFO *si;
PKCS7_ISSUER_AND_SERIAL *ias;
X509 *signer;
int i;
if (!p7) {
PKCS7error(PKCS7_R_INVALID_NULL_POINTER);
return NULL;
}
if (!PKCS7_type_is_signed(p7)) {
PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
return NULL;
}
/* Collect all the signers together */
sinfos = PKCS7_get_signer_info(p7);
if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
PKCS7error(PKCS7_R_NO_SIGNERS);
return 0;
}
if (!(signers = sk_X509_new_null())) {
PKCS7error(ERR_R_MALLOC_FAILURE);
return NULL;
}
for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
ias = si->issuer_and_serial;
signer = NULL;
/* If any certificates passed they take priority */
if (certs)
signer = X509_find_by_issuer_and_serial (certs,
ias->issuer, ias->serial);
if (!signer && !(flags & PKCS7_NOINTERN) && p7->d.sign->cert)
signer =
X509_find_by_issuer_and_serial(p7->d.sign->cert,
ias->issuer, ias->serial);
if (!signer) {
PKCS7error(PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
sk_X509_free(signers);
return 0;
}
if (!sk_X509_push(signers, signer)) {
sk_X509_free(signers);
return NULL;
}
}
return signers;
}
LCRYPTO_ALIAS(PKCS7_get0_signers);
/* Build a complete PKCS#7 enveloped data */
PKCS7 *
PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
int flags)
{
PKCS7 *p7;
BIO *p7bio = NULL;
int i;
X509 *x509;
if (!(p7 = PKCS7_new())) {
PKCS7error(ERR_R_MALLOC_FAILURE);
return NULL;
}
if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
goto err;
if (!PKCS7_set_cipher(p7, cipher)) {
PKCS7error(PKCS7_R_ERROR_SETTING_CIPHER);
goto err;
}
for (i = 0; i < sk_X509_num(certs); i++) {
x509 = sk_X509_value(certs, i);
if (!PKCS7_add_recipient(p7, x509)) {
PKCS7error(PKCS7_R_ERROR_ADDING_RECIPIENT);
goto err;
}
}
if (flags & PKCS7_STREAM)
return p7;
if (PKCS7_final(p7, in, flags))
return p7;
err:
BIO_free_all(p7bio);
PKCS7_free(p7);
return NULL;
}
LCRYPTO_ALIAS(PKCS7_encrypt);
int
PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
{
BIO *tmpmem;
int ret, i;
char buf[4096];
if (!p7) {
PKCS7error(PKCS7_R_INVALID_NULL_POINTER);
return 0;
}
if (!PKCS7_type_is_enveloped(p7)) {
PKCS7error(PKCS7_R_WRONG_CONTENT_TYPE);
return 0;
}
if (cert && !X509_check_private_key(cert, pkey)) {
PKCS7error(PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
return 0;
}
if (!(tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert))) {
PKCS7error(PKCS7_R_DECRYPT_ERROR);
return 0;
}
if (flags & PKCS7_TEXT) {
BIO *tmpbuf;
/* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
if (!(tmpbuf = BIO_new(BIO_f_buffer()))) {
PKCS7error(ERR_R_MALLOC_FAILURE);
BIO_free_all(tmpmem);
return 0;
}
BIO_push(tmpbuf, tmpmem);
ret = SMIME_text(tmpbuf, data);
if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
if (!BIO_get_cipher_status(tmpmem))
ret = 0;
}
BIO_free_all(tmpbuf);
return ret;
} else {
for (;;) {
i = BIO_read(tmpmem, buf, sizeof(buf));
if (i <= 0) {
ret = 1;
if (BIO_method_type(tmpmem) ==
BIO_TYPE_CIPHER) {
if (!BIO_get_cipher_status(tmpmem))
ret = 0;
}
break;
}
if (BIO_write(data, buf, i) != i) {
ret = 0;
break;
}
}
BIO_free_all(tmpmem);
return ret;
}
}
LCRYPTO_ALIAS(PKCS7_decrypt);
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