[331] | 1 | /*
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| 2 | * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (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 | #include "internal/cryptlib.h"
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| 11 | #include <openssl/asn1t.h>
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| 12 | #include <openssl/pem.h>
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| 13 | #include <openssl/x509v3.h>
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| 14 | #include <openssl/err.h>
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| 15 | #include <openssl/cms.h>
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| 16 | #include <openssl/rand.h>
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| 17 | #include "cms_lcl.h"
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| 18 |
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| 19 | /* CMS EncryptedData Utilities */
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| 20 |
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| 21 | /* Return BIO based on EncryptedContentInfo and key */
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| 22 |
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| 23 | BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
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| 24 | {
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| 25 | BIO *b;
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| 26 | EVP_CIPHER_CTX *ctx;
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| 27 | const EVP_CIPHER *ciph;
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| 28 | X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
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| 29 | unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
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| 30 | unsigned char *tkey = NULL;
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| 31 | size_t tkeylen = 0;
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| 32 |
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| 33 | int ok = 0;
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| 34 |
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| 35 | int enc, keep_key = 0;
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| 36 |
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| 37 | enc = ec->cipher ? 1 : 0;
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| 38 |
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| 39 | b = BIO_new(BIO_f_cipher());
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| 40 | if (b == NULL) {
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| 41 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
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| 42 | return NULL;
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| 43 | }
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| 44 |
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| 45 | BIO_get_cipher_ctx(b, &ctx);
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| 46 |
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| 47 | if (enc) {
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| 48 | ciph = ec->cipher;
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| 49 | /*
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| 50 | * If not keeping key set cipher to NULL so subsequent calls decrypt.
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| 51 | */
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| 52 | if (ec->key)
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| 53 | ec->cipher = NULL;
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| 54 | } else {
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| 55 | ciph = EVP_get_cipherbyobj(calg->algorithm);
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| 56 |
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| 57 | if (!ciph) {
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| 58 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, CMS_R_UNKNOWN_CIPHER);
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| 59 | goto err;
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| 60 | }
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| 61 | }
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| 62 |
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| 63 | if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0) {
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| 64 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
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| 65 | CMS_R_CIPHER_INITIALISATION_ERROR);
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| 66 | goto err;
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| 67 | }
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| 68 |
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| 69 | if (enc) {
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| 70 | int ivlen;
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| 71 | calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
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| 72 | /* Generate a random IV if we need one */
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| 73 | ivlen = EVP_CIPHER_CTX_iv_length(ctx);
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| 74 | if (ivlen > 0) {
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| 75 | if (RAND_bytes(iv, ivlen) <= 0)
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| 76 | goto err;
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| 77 | piv = iv;
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| 78 | }
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| 79 | } else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0) {
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| 80 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
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| 81 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
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| 82 | goto err;
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| 83 | }
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| 84 | tkeylen = EVP_CIPHER_CTX_key_length(ctx);
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| 85 | /* Generate random session key */
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| 86 | if (!enc || !ec->key) {
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| 87 | tkey = OPENSSL_malloc(tkeylen);
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| 88 | if (tkey == NULL) {
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| 89 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
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| 90 | goto err;
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| 91 | }
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| 92 | if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
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| 93 | goto err;
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| 94 | }
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| 95 |
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| 96 | if (!ec->key) {
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| 97 | ec->key = tkey;
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| 98 | ec->keylen = tkeylen;
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| 99 | tkey = NULL;
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| 100 | if (enc)
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| 101 | keep_key = 1;
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| 102 | else
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| 103 | ERR_clear_error();
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| 104 |
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| 105 | }
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| 106 |
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| 107 | if (ec->keylen != tkeylen) {
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| 108 | /* If necessary set key length */
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| 109 | if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
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| 110 | /*
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| 111 | * Only reveal failure if debugging so we don't leak information
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| 112 | * which may be useful in MMA.
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| 113 | */
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| 114 | if (enc || ec->debug) {
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| 115 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
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| 116 | CMS_R_INVALID_KEY_LENGTH);
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| 117 | goto err;
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| 118 | } else {
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| 119 | /* Use random key */
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| 120 | OPENSSL_clear_free(ec->key, ec->keylen);
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| 121 | ec->key = tkey;
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| 122 | ec->keylen = tkeylen;
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| 123 | tkey = NULL;
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| 124 | ERR_clear_error();
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| 125 | }
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| 126 | }
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| 127 | }
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| 128 |
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| 129 | if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
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| 130 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
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| 131 | CMS_R_CIPHER_INITIALISATION_ERROR);
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| 132 | goto err;
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| 133 | }
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| 134 | if (enc) {
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| 135 | calg->parameter = ASN1_TYPE_new();
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| 136 | if (calg->parameter == NULL) {
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| 137 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO, ERR_R_MALLOC_FAILURE);
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| 138 | goto err;
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| 139 | }
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| 140 | if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0) {
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| 141 | CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
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| 142 | CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
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| 143 | goto err;
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| 144 | }
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| 145 | /* If parameter type not set omit parameter */
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| 146 | if (calg->parameter->type == V_ASN1_UNDEF) {
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| 147 | ASN1_TYPE_free(calg->parameter);
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| 148 | calg->parameter = NULL;
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| 149 | }
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| 150 | }
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| 151 | ok = 1;
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| 152 |
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| 153 | err:
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| 154 | if (!keep_key || !ok) {
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| 155 | OPENSSL_clear_free(ec->key, ec->keylen);
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| 156 | ec->key = NULL;
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| 157 | }
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| 158 | OPENSSL_clear_free(tkey, tkeylen);
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| 159 | if (ok)
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| 160 | return b;
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| 161 | BIO_free(b);
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| 162 | return NULL;
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| 163 | }
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| 164 |
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| 165 | int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
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| 166 | const EVP_CIPHER *cipher,
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| 167 | const unsigned char *key, size_t keylen)
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| 168 | {
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| 169 | ec->cipher = cipher;
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| 170 | if (key) {
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| 171 | ec->key = OPENSSL_malloc(keylen);
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| 172 | if (ec->key == NULL)
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| 173 | return 0;
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| 174 | memcpy(ec->key, key, keylen);
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| 175 | }
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| 176 | ec->keylen = keylen;
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| 177 | if (cipher)
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| 178 | ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
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| 179 | return 1;
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| 180 | }
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| 181 |
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| 182 | int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
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| 183 | const unsigned char *key, size_t keylen)
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| 184 | {
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| 185 | CMS_EncryptedContentInfo *ec;
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| 186 | if (!key || !keylen) {
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| 187 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
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| 188 | return 0;
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| 189 | }
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| 190 | if (ciph) {
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| 191 | cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
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| 192 | if (!cms->d.encryptedData) {
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| 193 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, ERR_R_MALLOC_FAILURE);
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| 194 | return 0;
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| 195 | }
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| 196 | cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
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| 197 | cms->d.encryptedData->version = 0;
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| 198 | } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
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| 199 | CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NOT_ENCRYPTED_DATA);
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| 200 | return 0;
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| 201 | }
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| 202 | ec = cms->d.encryptedData->encryptedContentInfo;
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| 203 | return cms_EncryptedContent_init(ec, ciph, key, keylen);
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| 204 | }
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| 205 |
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| 206 | BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
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| 207 | {
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| 208 | CMS_EncryptedData *enc = cms->d.encryptedData;
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| 209 | if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
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| 210 | enc->version = 2;
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| 211 | return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
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| 212 | }
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