| 1 | /*
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| 2 | * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* Simple PKCS#7 processing functions */
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| 11 |
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| 12 | #include <stdio.h>
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| 13 | #include "internal/cryptlib.h"
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| 14 | #include <openssl/x509.h>
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| 15 | #include <openssl/x509v3.h>
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| 16 | #include "pk7_local.h"
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| 17 |
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| 18 | #define BUFFERSIZE 4096
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| 19 |
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| 20 |
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| 21 | static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
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| 22 |
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| 23 | PKCS7 *PKCS7_sign_ex(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
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| 24 | BIO *data, int flags, OSSL_LIB_CTX *libctx,
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| 25 | const char *propq)
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| 26 | {
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| 27 | PKCS7 *p7;
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| 28 | int i;
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| 29 |
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| 30 | if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
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| 31 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
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| 32 | return NULL;
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| 33 | }
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| 34 |
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| 35 | if (!PKCS7_set_type(p7, NID_pkcs7_signed))
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| 36 | goto err;
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| 37 |
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| 38 | if (!PKCS7_content_new(p7, NID_pkcs7_data))
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| 39 | goto err;
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| 40 |
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| 41 | if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags)) {
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| 42 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
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| 43 | goto err;
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| 44 | }
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| 45 |
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| 46 | if (!(flags & PKCS7_NOCERTS)) {
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| 47 | for (i = 0; i < sk_X509_num(certs); i++) {
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| 48 | if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
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| 49 | goto err;
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| 50 | }
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| 51 | }
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| 52 |
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| 53 | if (flags & PKCS7_DETACHED)
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| 54 | PKCS7_set_detached(p7, 1);
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| 55 |
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| 56 | if (flags & (PKCS7_STREAM | PKCS7_PARTIAL))
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| 57 | return p7;
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| 58 |
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| 59 | if (PKCS7_final(p7, data, flags))
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| 60 | return p7;
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| 61 |
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| 62 | err:
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| 63 | PKCS7_free(p7);
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| 64 | return NULL;
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| 65 | }
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| 66 |
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| 67 | PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
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| 68 | BIO *data, int flags)
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| 69 | {
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| 70 | return PKCS7_sign_ex(signcert, pkey, certs, data, flags, NULL, NULL);
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| 71 | }
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| 72 |
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| 73 |
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| 74 | int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
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| 75 | {
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| 76 | BIO *p7bio;
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| 77 | int ret = 0;
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| 78 |
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| 79 | if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
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| 80 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
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| 81 | return 0;
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| 82 | }
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| 83 |
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| 84 | if (!SMIME_crlf_copy(data, p7bio, flags))
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| 85 | goto err;
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| 86 |
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| 87 | (void)BIO_flush(p7bio);
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| 88 |
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| 89 | if (!PKCS7_dataFinal(p7, p7bio)) {
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| 90 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_DATASIGN);
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| 91 | goto err;
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| 92 | }
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| 93 | ret = 1;
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| 94 | err:
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| 95 | BIO_free_all(p7bio);
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| 96 |
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| 97 | return ret;
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| 98 |
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| 99 | }
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| 100 |
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| 101 | /* Check to see if a cipher exists and if so add S/MIME capabilities */
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| 102 |
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| 103 | static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
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| 104 | {
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| 105 | if (EVP_get_cipherbynid(nid))
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| 106 | return PKCS7_simple_smimecap(sk, nid, arg);
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| 107 | return 1;
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| 108 | }
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| 109 |
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| 110 | static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
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| 111 | {
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| 112 | if (EVP_get_digestbynid(nid))
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| 113 | return PKCS7_simple_smimecap(sk, nid, arg);
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| 114 | return 1;
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| 115 | }
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| 116 |
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| 117 | PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
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| 118 | EVP_PKEY *pkey, const EVP_MD *md,
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| 119 | int flags)
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| 120 | {
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| 121 | PKCS7_SIGNER_INFO *si = NULL;
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| 122 | STACK_OF(X509_ALGOR) *smcap = NULL;
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| 123 |
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| 124 | if (!X509_check_private_key(signcert, pkey)) {
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| 125 | ERR_raise(ERR_LIB_PKCS7,
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| 126 | PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
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| 127 | return NULL;
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| 128 | }
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| 129 |
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| 130 | if ((si = PKCS7_add_signature(p7, signcert, pkey, md)) == NULL) {
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| 131 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
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| 132 | return NULL;
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| 133 | }
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| 134 |
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| 135 | si->ctx = ossl_pkcs7_get0_ctx(p7);
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| 136 | if (!(flags & PKCS7_NOCERTS)) {
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| 137 | if (!PKCS7_add_certificate(p7, signcert))
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| 138 | goto err;
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| 139 | }
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| 140 |
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| 141 | if (!(flags & PKCS7_NOATTR)) {
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| 142 | if (!PKCS7_add_attrib_content_type(si, NULL))
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| 143 | goto err;
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| 144 | /* Add SMIMECapabilities */
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| 145 | if (!(flags & PKCS7_NOSMIMECAP)) {
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| 146 | if ((smcap = sk_X509_ALGOR_new_null()) == NULL) {
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| 147 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
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| 148 | goto err;
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| 149 | }
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| 150 | if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
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| 151 | || !add_digest_smcap(smcap, NID_id_GostR3411_2012_256, -1)
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| 152 | || !add_digest_smcap(smcap, NID_id_GostR3411_2012_512, -1)
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| 153 | || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
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| 154 | || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
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| 155 | || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
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| 156 | || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
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| 157 | || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
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| 158 | || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
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| 159 | || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
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| 160 | || !add_cipher_smcap(smcap, NID_des_cbc, -1)
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| 161 | || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
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| 162 | || !PKCS7_add_attrib_smimecap(si, smcap))
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| 163 | goto err;
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| 164 | sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
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| 165 | smcap = NULL;
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| 166 | }
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| 167 | if (flags & PKCS7_REUSE_DIGEST) {
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| 168 | if (!pkcs7_copy_existing_digest(p7, si))
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| 169 | goto err;
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| 170 | if (!(flags & PKCS7_PARTIAL)
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| 171 | && !PKCS7_SIGNER_INFO_sign(si))
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| 172 | goto err;
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| 173 | }
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| 174 | }
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| 175 | return si;
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| 176 | err:
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| 177 | sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
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| 178 | return NULL;
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| 179 | }
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| 180 |
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| 181 | /*
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| 182 | * Search for a digest matching SignerInfo digest type and if found copy
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| 183 | * across.
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| 184 | */
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| 185 |
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| 186 | static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
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| 187 | {
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| 188 | int i;
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| 189 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
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| 190 | PKCS7_SIGNER_INFO *sitmp;
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| 191 | ASN1_OCTET_STRING *osdig = NULL;
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| 192 | sinfos = PKCS7_get_signer_info(p7);
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| 193 | for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
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| 194 | sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
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| 195 | if (si == sitmp)
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| 196 | break;
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| 197 | if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
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| 198 | continue;
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| 199 | if (!OBJ_cmp(si->digest_alg->algorithm, sitmp->digest_alg->algorithm)) {
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| 200 | osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
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| 201 | break;
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| 202 | }
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| 203 |
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| 204 | }
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| 205 |
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| 206 | if (osdig != NULL)
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| 207 | return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
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| 208 |
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| 209 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
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| 210 | return 0;
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| 211 | }
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| 212 |
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| 213 | int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
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| 214 | BIO *indata, BIO *out, int flags)
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| 215 | {
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| 216 | STACK_OF(X509) *signers;
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| 217 | X509 *signer;
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| 218 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
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| 219 | PKCS7_SIGNER_INFO *si;
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| 220 | X509_STORE_CTX *cert_ctx = NULL;
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| 221 | char *buf = NULL;
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| 222 | int i, j = 0, k, ret = 0;
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| 223 | BIO *p7bio = NULL;
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| 224 | BIO *tmpin = NULL, *tmpout = NULL;
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| 225 | const PKCS7_CTX *p7_ctx;
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| 226 |
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| 227 | if (p7 == NULL) {
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| 228 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
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| 229 | return 0;
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| 230 | }
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| 231 |
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| 232 | if (!PKCS7_type_is_signed(p7)) {
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| 233 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
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| 234 | return 0;
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| 235 | }
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| 236 |
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| 237 | /* Check for no data and no content: no data to verify signature */
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| 238 | if (PKCS7_get_detached(p7) && !indata) {
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| 239 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_CONTENT);
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| 240 | return 0;
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| 241 | }
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| 242 |
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| 243 | if (flags & PKCS7_NO_DUAL_CONTENT) {
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| 244 | /*
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| 245 | * This was originally "#if 0" because we thought that only old broken
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| 246 | * Netscape did this. It turns out that Authenticode uses this kind
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| 247 | * of "extended" PKCS7 format, and things like UEFI secure boot and
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| 248 | * tools like osslsigncode need it. In Authenticode the verification
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| 249 | * process is different, but the existing PKCs7 verification works.
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| 250 | */
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| 251 | if (!PKCS7_get_detached(p7) && indata) {
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| 252 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_CONTENT_AND_DATA_PRESENT);
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| 253 | return 0;
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| 254 | }
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| 255 | }
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| 256 |
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| 257 | sinfos = PKCS7_get_signer_info(p7);
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| 258 |
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| 259 | if (!sinfos || !sk_PKCS7_SIGNER_INFO_num(sinfos)) {
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| 260 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNATURES_ON_DATA);
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| 261 | return 0;
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| 262 | }
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| 263 |
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| 264 | signers = PKCS7_get0_signers(p7, certs, flags);
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| 265 | if (signers == NULL)
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| 266 | return 0;
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| 267 |
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| 268 | /* Now verify the certificates */
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| 269 | p7_ctx = ossl_pkcs7_get0_ctx(p7);
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| 270 | cert_ctx = X509_STORE_CTX_new_ex(ossl_pkcs7_ctx_get0_libctx(p7_ctx),
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| 271 | ossl_pkcs7_ctx_get0_propq(p7_ctx));
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| 272 | if (cert_ctx == NULL)
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| 273 | goto err;
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| 274 | if (!(flags & PKCS7_NOVERIFY))
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| 275 | for (k = 0; k < sk_X509_num(signers); k++) {
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| 276 | signer = sk_X509_value(signers, k);
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| 277 | if (!(flags & PKCS7_NOCHAIN)) {
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| 278 | if (!X509_STORE_CTX_init(cert_ctx, store, signer,
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| 279 | p7->d.sign->cert)) {
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| 280 | ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
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| 281 | goto err;
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| 282 | }
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| 283 | if (!X509_STORE_CTX_set_default(cert_ctx, "smime_sign"))
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| 284 | goto err;
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| 285 | } else if (!X509_STORE_CTX_init(cert_ctx, store, signer, NULL)) {
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| 286 | ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);
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| 287 | goto err;
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| 288 | }
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| 289 | if (!(flags & PKCS7_NOCRL))
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| 290 | X509_STORE_CTX_set0_crls(cert_ctx, p7->d.sign->crl);
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| 291 | i = X509_verify_cert(cert_ctx);
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| 292 | if (i <= 0)
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| 293 | j = X509_STORE_CTX_get_error(cert_ctx);
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| 294 | if (i <= 0) {
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| 295 | ERR_raise_data(ERR_LIB_PKCS7, PKCS7_R_CERTIFICATE_VERIFY_ERROR,
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| 296 | "Verify error: %s",
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| 297 | X509_verify_cert_error_string(j));
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| 298 | goto err;
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| 299 | }
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| 300 | /* Check for revocation status here */
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| 301 | }
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| 302 |
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| 303 | /*
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| 304 | * Performance optimization: if the content is a memory BIO then store
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| 305 | * its contents in a temporary read only memory BIO. This avoids
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| 306 | * potentially large numbers of slow copies of data which will occur when
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| 307 | * reading from a read write memory BIO when signatures are calculated.
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| 308 | */
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| 309 |
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| 310 | if (indata && (BIO_method_type(indata) == BIO_TYPE_MEM)) {
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| 311 | char *ptr;
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| 312 | long len;
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| 313 | len = BIO_get_mem_data(indata, &ptr);
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| 314 | tmpin = (len == 0) ? indata : BIO_new_mem_buf(ptr, len);
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| 315 | if (tmpin == NULL) {
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| 316 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
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| 317 | goto err;
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| 318 | }
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| 319 | } else
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| 320 | tmpin = indata;
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| 321 |
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| 322 | if ((p7bio = PKCS7_dataInit(p7, tmpin)) == NULL)
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| 323 | goto err;
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| 324 |
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| 325 | if (flags & PKCS7_TEXT) {
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| 326 | if ((tmpout = BIO_new(BIO_s_mem())) == NULL) {
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| 327 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
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| 328 | goto err;
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| 329 | }
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| 330 | BIO_set_mem_eof_return(tmpout, 0);
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| 331 | } else
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| 332 | tmpout = out;
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| 333 |
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| 334 | /* We now have to 'read' from p7bio to calculate digests etc. */
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| 335 | if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
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| 336 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
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| 337 | goto err;
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| 338 | }
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| 339 | for (;;) {
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| 340 | i = BIO_read(p7bio, buf, BUFFERSIZE);
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| 341 | if (i <= 0)
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| 342 | break;
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| 343 | if (tmpout)
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| 344 | BIO_write(tmpout, buf, i);
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| 345 | }
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| 346 |
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| 347 | if (flags & PKCS7_TEXT) {
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| 348 | if (!SMIME_text(tmpout, out)) {
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| 349 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SMIME_TEXT_ERROR);
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| 350 | BIO_free(tmpout);
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| 351 | goto err;
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| 352 | }
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| 353 | BIO_free(tmpout);
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| 354 | }
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| 355 |
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| 356 | /* Now Verify All Signatures */
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| 357 | if (!(flags & PKCS7_NOSIGS))
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| 358 | for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
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| 359 | si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
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| 360 | signer = sk_X509_value(signers, i);
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| 361 | j = PKCS7_signatureVerify(p7bio, p7, si, signer);
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| 362 | if (j <= 0) {
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| 363 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNATURE_FAILURE);
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| 364 | goto err;
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| 365 | }
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| 366 | }
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| 367 |
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| 368 | ret = 1;
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| 369 |
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| 370 | err:
|
|---|
| 371 | X509_STORE_CTX_free(cert_ctx);
|
|---|
| 372 | OPENSSL_free(buf);
|
|---|
| 373 | if (tmpin == indata) {
|
|---|
| 374 | if (indata)
|
|---|
| 375 | BIO_pop(p7bio);
|
|---|
| 376 | }
|
|---|
| 377 | BIO_free_all(p7bio);
|
|---|
| 378 | sk_X509_free(signers);
|
|---|
| 379 | return ret;
|
|---|
| 380 | }
|
|---|
| 381 |
|
|---|
| 382 | STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs,
|
|---|
| 383 | int flags)
|
|---|
| 384 | {
|
|---|
| 385 | STACK_OF(X509) *signers;
|
|---|
| 386 | STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
|
|---|
| 387 | PKCS7_SIGNER_INFO *si;
|
|---|
| 388 | PKCS7_ISSUER_AND_SERIAL *ias;
|
|---|
| 389 | X509 *signer;
|
|---|
| 390 | int i;
|
|---|
| 391 |
|
|---|
| 392 | if (p7 == NULL) {
|
|---|
| 393 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
|
|---|
| 394 | return NULL;
|
|---|
| 395 | }
|
|---|
| 396 |
|
|---|
| 397 | if (!PKCS7_type_is_signed(p7)) {
|
|---|
| 398 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
|
|---|
| 399 | return NULL;
|
|---|
| 400 | }
|
|---|
| 401 |
|
|---|
| 402 | /* Collect all the signers together */
|
|---|
| 403 |
|
|---|
| 404 | sinfos = PKCS7_get_signer_info(p7);
|
|---|
| 405 |
|
|---|
| 406 | if (sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
|
|---|
| 407 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_NO_SIGNERS);
|
|---|
| 408 | return 0;
|
|---|
| 409 | }
|
|---|
| 410 |
|
|---|
| 411 | if ((signers = sk_X509_new_null()) == NULL) {
|
|---|
| 412 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
|
|---|
| 413 | return NULL;
|
|---|
| 414 | }
|
|---|
| 415 |
|
|---|
| 416 | for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++) {
|
|---|
| 417 | si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
|
|---|
| 418 | ias = si->issuer_and_serial;
|
|---|
| 419 | signer = NULL;
|
|---|
| 420 | /* If any certificates passed they take priority */
|
|---|
| 421 | if (certs)
|
|---|
| 422 | signer = X509_find_by_issuer_and_serial(certs,
|
|---|
| 423 | ias->issuer, ias->serial);
|
|---|
| 424 | if (!signer && !(flags & PKCS7_NOINTERN)
|
|---|
| 425 | && p7->d.sign->cert)
|
|---|
| 426 | signer =
|
|---|
| 427 | X509_find_by_issuer_and_serial(p7->d.sign->cert,
|
|---|
| 428 | ias->issuer, ias->serial);
|
|---|
| 429 | if (!signer) {
|
|---|
| 430 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
|
|---|
| 431 | sk_X509_free(signers);
|
|---|
| 432 | return 0;
|
|---|
| 433 | }
|
|---|
| 434 |
|
|---|
| 435 | if (!sk_X509_push(signers, signer)) {
|
|---|
| 436 | sk_X509_free(signers);
|
|---|
| 437 | return NULL;
|
|---|
| 438 | }
|
|---|
| 439 | }
|
|---|
| 440 | return signers;
|
|---|
| 441 | }
|
|---|
| 442 |
|
|---|
| 443 | /* Build a complete PKCS#7 enveloped data */
|
|---|
| 444 |
|
|---|
| 445 | PKCS7 *PKCS7_encrypt_ex(STACK_OF(X509) *certs, BIO *in,
|
|---|
| 446 | const EVP_CIPHER *cipher, int flags,
|
|---|
| 447 | OSSL_LIB_CTX *libctx, const char *propq)
|
|---|
| 448 | {
|
|---|
| 449 | PKCS7 *p7;
|
|---|
| 450 | BIO *p7bio = NULL;
|
|---|
| 451 | int i;
|
|---|
| 452 | X509 *x509;
|
|---|
| 453 |
|
|---|
| 454 | if ((p7 = PKCS7_new_ex(libctx, propq)) == NULL) {
|
|---|
| 455 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
|
|---|
| 456 | return NULL;
|
|---|
| 457 | }
|
|---|
| 458 |
|
|---|
| 459 | if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
|
|---|
| 460 | goto err;
|
|---|
| 461 | if (!PKCS7_set_cipher(p7, cipher)) {
|
|---|
| 462 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_SETTING_CIPHER);
|
|---|
| 463 | goto err;
|
|---|
| 464 | }
|
|---|
| 465 |
|
|---|
| 466 | for (i = 0; i < sk_X509_num(certs); i++) {
|
|---|
| 467 | x509 = sk_X509_value(certs, i);
|
|---|
| 468 | if (!PKCS7_add_recipient(p7, x509)) {
|
|---|
| 469 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_ERROR_ADDING_RECIPIENT);
|
|---|
| 470 | goto err;
|
|---|
| 471 | }
|
|---|
| 472 | }
|
|---|
| 473 |
|
|---|
| 474 | if (flags & PKCS7_STREAM)
|
|---|
| 475 | return p7;
|
|---|
| 476 |
|
|---|
| 477 | if (PKCS7_final(p7, in, flags))
|
|---|
| 478 | return p7;
|
|---|
| 479 |
|
|---|
| 480 | err:
|
|---|
| 481 |
|
|---|
| 482 | BIO_free_all(p7bio);
|
|---|
| 483 | PKCS7_free(p7);
|
|---|
| 484 | return NULL;
|
|---|
| 485 |
|
|---|
| 486 | }
|
|---|
| 487 |
|
|---|
| 488 | PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
|
|---|
| 489 | int flags)
|
|---|
| 490 | {
|
|---|
| 491 | return PKCS7_encrypt_ex(certs, in, cipher, flags, NULL, NULL);
|
|---|
| 492 | }
|
|---|
| 493 |
|
|---|
| 494 |
|
|---|
| 495 | int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
|
|---|
| 496 | {
|
|---|
| 497 | BIO *tmpmem;
|
|---|
| 498 | int ret = 0, i;
|
|---|
| 499 | char *buf = NULL;
|
|---|
| 500 |
|
|---|
| 501 | if (p7 == NULL) {
|
|---|
| 502 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_INVALID_NULL_POINTER);
|
|---|
| 503 | return 0;
|
|---|
| 504 | }
|
|---|
| 505 |
|
|---|
| 506 | if (!PKCS7_type_is_enveloped(p7)) {
|
|---|
| 507 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_WRONG_CONTENT_TYPE);
|
|---|
| 508 | return 0;
|
|---|
| 509 | }
|
|---|
| 510 |
|
|---|
| 511 | if (cert && !X509_check_private_key(cert, pkey)) {
|
|---|
| 512 | ERR_raise(ERR_LIB_PKCS7,
|
|---|
| 513 | PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
|
|---|
| 514 | return 0;
|
|---|
| 515 | }
|
|---|
| 516 |
|
|---|
| 517 | if ((tmpmem = PKCS7_dataDecode(p7, pkey, NULL, cert)) == NULL) {
|
|---|
| 518 | ERR_raise(ERR_LIB_PKCS7, PKCS7_R_DECRYPT_ERROR);
|
|---|
| 519 | return 0;
|
|---|
| 520 | }
|
|---|
| 521 |
|
|---|
| 522 | if (flags & PKCS7_TEXT) {
|
|---|
| 523 | BIO *tmpbuf, *bread;
|
|---|
| 524 | /* Encrypt BIOs can't do BIO_gets() so add a buffer BIO */
|
|---|
| 525 | if ((tmpbuf = BIO_new(BIO_f_buffer())) == NULL) {
|
|---|
| 526 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
|
|---|
| 527 | BIO_free_all(tmpmem);
|
|---|
| 528 | return 0;
|
|---|
| 529 | }
|
|---|
| 530 | if ((bread = BIO_push(tmpbuf, tmpmem)) == NULL) {
|
|---|
| 531 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
|
|---|
| 532 | BIO_free_all(tmpbuf);
|
|---|
| 533 | BIO_free_all(tmpmem);
|
|---|
| 534 | return 0;
|
|---|
| 535 | }
|
|---|
| 536 | ret = SMIME_text(bread, data);
|
|---|
| 537 | if (ret > 0 && BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
|
|---|
| 538 | if (BIO_get_cipher_status(tmpmem) <= 0)
|
|---|
| 539 | ret = 0;
|
|---|
| 540 | }
|
|---|
| 541 | BIO_free_all(bread);
|
|---|
| 542 | return ret;
|
|---|
| 543 | }
|
|---|
| 544 | if ((buf = OPENSSL_malloc(BUFFERSIZE)) == NULL) {
|
|---|
| 545 | ERR_raise(ERR_LIB_PKCS7, ERR_R_MALLOC_FAILURE);
|
|---|
| 546 | goto err;
|
|---|
| 547 | }
|
|---|
| 548 | for (;;) {
|
|---|
| 549 | i = BIO_read(tmpmem, buf, BUFFERSIZE);
|
|---|
| 550 | if (i <= 0) {
|
|---|
| 551 | ret = 1;
|
|---|
| 552 | if (BIO_method_type(tmpmem) == BIO_TYPE_CIPHER) {
|
|---|
| 553 | if (BIO_get_cipher_status(tmpmem) <= 0)
|
|---|
| 554 | ret = 0;
|
|---|
| 555 | }
|
|---|
| 556 |
|
|---|
| 557 | break;
|
|---|
| 558 | }
|
|---|
| 559 | if (BIO_write(data, buf, i) != i) {
|
|---|
| 560 | break;
|
|---|
| 561 | }
|
|---|
| 562 | }
|
|---|
| 563 | err:
|
|---|
| 564 | OPENSSL_free(buf);
|
|---|
| 565 | BIO_free_all(tmpmem);
|
|---|
| 566 | return ret;
|
|---|
| 567 | }
|
|---|
