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
PKCS12_mac_present(const PKCS12 * p12)77 PKCS12_mac_present(const PKCS12 *p12)
78 {
79 return p12->mac != NULL;
80 }
81
82 void
PKCS12_get0_mac(const ASN1_OCTET_STRING ** pmac,const X509_ALGOR ** pmacalg,const ASN1_OCTET_STRING ** psalt,const ASN1_INTEGER ** piter,const PKCS12 * p12)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
PKCS12_gen_mac(PKCS12 * p12,const char * pass,int passlen,unsigned char * mac,unsigned int * maclen)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
PKCS12_verify_mac(PKCS12 * p12,const char * pass,int passlen)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
PKCS12_set_mac(PKCS12 * p12,const char * pass,int passlen,unsigned char * salt,int saltlen,int iter,const EVP_MD * md_type)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
PKCS12_setup_mac(PKCS12 * p12,int iter,unsigned char * salt,int saltlen,const EVP_MD * md_type)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