1 /* $OpenBSD: p12_mutl.c,v 1.32 2022/08/20 09:16:18 tb Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 1999. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include <openssl/opensslconf.h> 64 65 #ifndef OPENSSL_NO_HMAC 66 67 #include <openssl/err.h> 68 #include <openssl/hmac.h> 69 #include <openssl/pkcs12.h> 70 71 #include "evp_locl.h" 72 #include "hmac_local.h" 73 #include "pkcs12_local.h" 74 #include "x509_lcl.h" 75 76 int 77 PKCS12_mac_present(const PKCS12 *p12) 78 { 79 return p12->mac != NULL; 80 } 81 82 void 83 PKCS12_get0_mac(const ASN1_OCTET_STRING **pmac, const X509_ALGOR **pmacalg, 84 const ASN1_OCTET_STRING **psalt, const ASN1_INTEGER **piter, 85 const PKCS12 *p12) 86 { 87 if (p12->mac == NULL) { 88 if (pmac != NULL) 89 *pmac = NULL; 90 if (pmacalg != NULL) 91 *pmacalg = NULL; 92 if (psalt != NULL) 93 *psalt = NULL; 94 if (piter != NULL) 95 *piter = NULL; 96 return; 97 } 98 99 if (pmac != NULL) 100 *pmac = p12->mac->dinfo->digest; 101 if (pmacalg != NULL) 102 *pmacalg = p12->mac->dinfo->algor; 103 if (psalt != NULL) 104 *psalt = p12->mac->salt; 105 if (piter != NULL) 106 *piter = p12->mac->iter; 107 } 108 109 /* Generate a MAC */ 110 int 111 PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen, 112 unsigned char *mac, unsigned int *maclen) 113 { 114 const EVP_MD *md_type; 115 HMAC_CTX *hmac = NULL; 116 unsigned char key[EVP_MAX_MD_SIZE], *salt; 117 int saltlen, iter; 118 int md_size; 119 int ret = 0; 120 121 if (!PKCS7_type_is_data(p12->authsafes)) { 122 PKCS12error(PKCS12_R_CONTENT_TYPE_NOT_DATA); 123 goto err; 124 } 125 126 salt = p12->mac->salt->data; 127 saltlen = p12->mac->salt->length; 128 129 iter = 1; 130 if (p12->mac->iter != NULL) { 131 if ((iter = ASN1_INTEGER_get(p12->mac->iter)) <= 0) { 132 PKCS12error(PKCS12_R_DECODE_ERROR); 133 goto err; 134 } 135 } 136 137 md_type = EVP_get_digestbyobj(p12->mac->dinfo->algor->algorithm); 138 if (md_type == NULL) { 139 PKCS12error(PKCS12_R_UNKNOWN_DIGEST_ALGORITHM); 140 goto err; 141 } 142 143 if ((md_size = EVP_MD_size(md_type)) < 0) 144 goto err; 145 146 if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter, 147 md_size, key, md_type)) { 148 PKCS12error(PKCS12_R_KEY_GEN_ERROR); 149 goto err; 150 } 151 152 if ((hmac = HMAC_CTX_new()) == NULL) 153 goto err; 154 if (!HMAC_Init_ex(hmac, key, md_size, md_type, NULL)) 155 goto err; 156 if (!HMAC_Update(hmac, p12->authsafes->d.data->data, 157 p12->authsafes->d.data->length)) 158 goto err; 159 if (!HMAC_Final(hmac, mac, maclen)) 160 goto err; 161 162 ret = 1; 163 164 err: 165 explicit_bzero(key, sizeof(key)); 166 HMAC_CTX_free(hmac); 167 168 return ret; 169 } 170 171 /* Verify the mac */ 172 int 173 PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen) 174 { 175 unsigned char mac[EVP_MAX_MD_SIZE]; 176 unsigned int maclen; 177 178 if (p12->mac == NULL) { 179 PKCS12error(PKCS12_R_MAC_ABSENT); 180 return 0; 181 } 182 if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) { 183 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR); 184 return 0; 185 } 186 if ((maclen != (unsigned int)p12->mac->dinfo->digest->length) || 187 memcmp(mac, p12->mac->dinfo->digest->data, maclen)) 188 return 0; 189 return 1; 190 } 191 192 /* Set a mac */ 193 194 int 195 PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen, unsigned char *salt, 196 int saltlen, int iter, const EVP_MD *md_type) 197 { 198 unsigned char mac[EVP_MAX_MD_SIZE]; 199 unsigned int maclen; 200 201 if (!md_type) 202 md_type = EVP_sha1(); 203 if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) == 204 PKCS12_ERROR) { 205 PKCS12error(PKCS12_R_MAC_SETUP_ERROR); 206 return 0; 207 } 208 if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) { 209 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR); 210 return 0; 211 } 212 if (!(ASN1_STRING_set(p12->mac->dinfo->digest, mac, maclen))) { 213 PKCS12error(PKCS12_R_MAC_STRING_SET_ERROR); 214 return 0; 215 } 216 return 1; 217 } 218 219 /* Set up a mac structure */ 220 int 221 PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen, 222 const EVP_MD *md_type) 223 { 224 PKCS12_MAC_DATA_free(p12->mac); 225 if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL) 226 return PKCS12_ERROR; 227 if (iter > 1) { 228 if (!(p12->mac->iter = ASN1_INTEGER_new())) { 229 PKCS12error(ERR_R_MALLOC_FAILURE); 230 return 0; 231 } 232 if (!ASN1_INTEGER_set(p12->mac->iter, iter)) { 233 PKCS12error(ERR_R_MALLOC_FAILURE); 234 return 0; 235 } 236 } 237 if (!saltlen) 238 saltlen = PKCS12_SALT_LEN; 239 if (!(p12->mac->salt->data = malloc(saltlen))) { 240 PKCS12error(ERR_R_MALLOC_FAILURE); 241 return 0; 242 } 243 p12->mac->salt->length = saltlen; 244 if (!salt) 245 arc4random_buf(p12->mac->salt->data, saltlen); 246 else 247 memcpy(p12->mac->salt->data, salt, saltlen); 248 p12->mac->dinfo->algor->algorithm = OBJ_nid2obj(EVP_MD_type(md_type)); 249 if (!(p12->mac->dinfo->algor->parameter = ASN1_TYPE_new())) { 250 PKCS12error(ERR_R_MALLOC_FAILURE); 251 return 0; 252 } 253 p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL; 254 255 return 1; 256 } 257 #endif 258