crypto/pkcs12/p12_mutl.c

   1 /*
   2  * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * HMAC low level APIs are deprecated for public use, but still ok for internal
  12  * use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include "internal/cryptlib.h"
  18 #include <openssl/crypto.h>
  19 #include <openssl/hmac.h>
  20 #include <openssl/rand.h>
  21 #include <openssl/pkcs12.h>
  22 #include "p12_local.h"
  23
  24 int PKCS12_mac_present(const PKCS12 *p12)
  25 {
  26     return p12->mac ? 1 : 0;
  27 }
  28
  29 void PKCS12_get0_mac(const ASN1_OCTET_STRING **pmac,
  30                      const X509_ALGOR **pmacalg,
  31                      const ASN1_OCTET_STRING **psalt,
  32                      const ASN1_INTEGER **piter,
  33                      const PKCS12 *p12)
  34 {
  35     if (p12->mac) {
  36         X509_SIG_get0(p12->mac->dinfo, pmacalg, pmac);
  37         if (psalt)
  38             *psalt = p12->mac->salt;
  39         if (piter)
  40             *piter = p12->mac->iter;
  41     } else {
  42         if (pmac)
  43             *pmac = NULL;
  44         if (pmacalg)
  45             *pmacalg = NULL;
  46         if (psalt)
  47             *psalt = NULL;
  48         if (piter)
  49             *piter = NULL;
  50     }
  51 }
  52
  53 #define TK26_MAC_KEY_LEN 32
  54
  55 static int pkcs12_gen_gost_mac_key(const char *pass, int passlen,
  56                                    const unsigned char *salt, int saltlen,
  57                                    int iter, int keylen, unsigned char *key,
  58                                    const EVP_MD *digest)
  59 {
  60     unsigned char out[96];
  61
  62     if (keylen != TK26_MAC_KEY_LEN) {
  63         return 0;
  64     }
  65
  66     if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter,
  67                            digest, sizeof(out), out)) {
  68         return 0;
  69     }
  70     memcpy(key, out + sizeof(out) - TK26_MAC_KEY_LEN, TK26_MAC_KEY_LEN);
  71     OPENSSL_cleanse(out, sizeof(out));
  72     return 1;
  73 }
  74
  75 /* Generate a MAC */
  76 static int pkcs12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
  77                           unsigned char *mac, unsigned int *maclen,
  78                           int (*pkcs12_key_gen)(const char *pass, int passlen,
  79                                                 unsigned char *salt, int slen,
  80                                                 int id, int iter, int n,
  81                                                 unsigned char *out,
  82                                                 const EVP_MD *md_type))
  83 {
  84     int ret = 0;
  85     const EVP_MD *md;
  86     EVP_MD *md_fetch;
  87     HMAC_CTX *hmac = NULL;
  88     unsigned char key[EVP_MAX_MD_SIZE], *salt;
  89     int saltlen, iter;
  90     char md_name[80];
  91     int md_size = 0;
  92     int md_nid;
  93     const X509_ALGOR *macalg;
  94     const ASN1_OBJECT *macoid;
  95
  96     if (!PKCS7_type_is_data(p12->authsafes)) {
  97         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_CONTENT_TYPE_NOT_DATA);
  98         return 0;
  99     }
 100
 101     salt = p12->mac->salt->data;
 102     saltlen = p12->mac->salt->length;
 103     if (p12->mac->iter == NULL)
 104         iter = 1;
 105     else
 106         iter = ASN1_INTEGER_get(p12->mac->iter);
 107     X509_SIG_get0(p12->mac->dinfo, &macalg, NULL);
 108     X509_ALGOR_get0(&macoid, NULL, NULL, macalg);
 109     if (OBJ_obj2txt(md_name, sizeof(md_name), macoid, 0) < 0)
 110         return 0;
 111     md = md_fetch = EVP_MD_fetch(p12->authsafes->ctx.libctx, md_name,
 112                                  p12->authsafes->ctx.propq);
 113     if (md == NULL)
 114         md = EVP_get_digestbynid(OBJ_obj2nid(macoid));
 115
 116     if (md == NULL) {
 117         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
 118         return 0;
 119     }
 120     md_size = EVP_MD_get_size(md);
 121     md_nid = EVP_MD_get_type(md);
 122     if (md_size < 0)
 123         goto err;
 124     if ((md_nid == NID_id_GostR3411_94
 125          || md_nid == NID_id_GostR3411_2012_256
 126          || md_nid == NID_id_GostR3411_2012_512)
 127         && ossl_safe_getenv("LEGACY_GOST_PKCS12") == NULL) {
 128         md_size = TK26_MAC_KEY_LEN;
 129         if (!pkcs12_gen_gost_mac_key(pass, passlen, salt, saltlen, iter,
 130                                      md_size, key, md)) {
 131             ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
 132             goto err;
 133         }
 134     } else {
 135         if (pkcs12_key_gen != NULL) {
 136             if (!(*pkcs12_key_gen)(pass, passlen, salt, saltlen, PKCS12_MAC_ID,
 137                                    iter, md_size, key, md)) {
 138                 ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
 139                 goto err;
 140             }
 141         } else {
 142             /* Default to UTF-8 password */
 143             if (!PKCS12_key_gen_utf8_ex(pass, passlen, salt, saltlen, PKCS12_MAC_ID,
 144                                        iter, md_size, key, md,
 145                                        p12->authsafes->ctx.libctx,
 146                                        p12->authsafes->ctx.propq)) {
 147                 ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
 148                 goto err;
 149             }
 150         }
 151     }
 152     if ((hmac = HMAC_CTX_new()) == NULL
 153         || !HMAC_Init_ex(hmac, key, md_size, md, NULL)
 154         || !HMAC_Update(hmac, p12->authsafes->d.data->data,
 155                         p12->authsafes->d.data->length)
 156         || !HMAC_Final(hmac, mac, maclen)) {
 157         goto err;
 158     }
 159     ret = 1;
 160
 161 err:
 162     OPENSSL_cleanse(key, sizeof(key));
 163     HMAC_CTX_free(hmac);
 164     EVP_MD_free(md_fetch);
 165     return ret;
 166 }
 167
 168 int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
 169                    unsigned char *mac, unsigned int *maclen)
 170 {
 171     return pkcs12_gen_mac(p12, pass, passlen, mac, maclen, NULL);
 172 }
 173
 174 /* Verify the mac */
 175 int PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
 176 {
 177     unsigned char mac[EVP_MAX_MD_SIZE];
 178     unsigned int maclen;
 179     const ASN1_OCTET_STRING *macoct;
 180
 181     if (p12->mac == NULL) {
 182         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_ABSENT);
 183         return 0;
 184     }
 185     if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen, NULL)) {
 186         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_GENERATION_ERROR);
 187         return 0;
 188     }
 189     X509_SIG_get0(p12->mac->dinfo, NULL, &macoct);
 190     if ((maclen != (unsigned int)ASN1_STRING_length(macoct))
 191         || CRYPTO_memcmp(mac, ASN1_STRING_get0_data(macoct), maclen) != 0)
 192         return 0;
 193
 194     return 1;
 195 }
 196
 197 /* Set a mac */
 198
 199 int PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen,
 200                    unsigned char *salt, int saltlen, int iter,
 201                    const EVP_MD *md_type)
 202 {
 203     unsigned char mac[EVP_MAX_MD_SIZE];
 204     unsigned int maclen;
 205     ASN1_OCTET_STRING *macoct;
 206
 207     if (md_type == NULL)
 208         /* No need to do a fetch as the md_type is used only to get a NID */
 209         md_type = EVP_sha256();
 210     if (!iter)
 211         iter = PKCS12_DEFAULT_ITER;
 212     if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) == PKCS12_ERROR) {
 213         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_SETUP_ERROR);
 214         return 0;
 215     }
 216     /*
 217      * Note that output mac is forced to UTF-8...
 218      */
 219     if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen, NULL)) {
 220         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_GENERATION_ERROR);
 221         return 0;
 222     }
 223     X509_SIG_getm(p12->mac->dinfo, NULL, &macoct);
 224     if (!ASN1_OCTET_STRING_set(macoct, mac, maclen)) {
 225         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_STRING_SET_ERROR);
 226         return 0;
 227     }
 228     return 1;
 229 }
 230
 231 /* Set up a mac structure */
 232 int PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
 233                      const EVP_MD *md_type)
 234 {
 235     X509_ALGOR *macalg;
 236
 237     PKCS12_MAC_DATA_free(p12->mac);
 238     p12->mac = NULL;
 239
 240     if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)
 241         return PKCS12_ERROR;
 242     if (iter > 1) {
 243         if ((p12->mac->iter = ASN1_INTEGER_new()) == NULL) {
 244             ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 245             return 0;
 246         }
 247         if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {
 248             ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 249             return 0;
 250         }
 251     }
 252     if (!saltlen)
 253         saltlen = PKCS12_SALT_LEN;
 254     if (saltlen < 0)
 255         return 0;
 256     if ((p12->mac->salt->data = OPENSSL_malloc(saltlen)) == NULL) {
 257         ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 258         return 0;
 259     }
 260     p12->mac->salt->length = saltlen;
 261     if (!salt) {
 262         if (saltlen < 0)
 263             return 0;
 264         if (RAND_bytes_ex(p12->authsafes->ctx.libctx, p12->mac->salt->data,
 265                           (size_t)saltlen, 0) <= 0)
 266             return 0;
 267     } else
 268         memcpy(p12->mac->salt->data, salt, saltlen);
 269     X509_SIG_getm(p12->mac->dinfo, &macalg, NULL);
 270     if (!X509_ALGOR_set0(macalg, OBJ_nid2obj(EVP_MD_get_type(md_type)),
 271                          V_ASN1_NULL, NULL)) {
 272         ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 273         return 0;
 274     }
 275
 276     return 1;
 277 }