crypto/pkcs12/p12_mutl.c

   1 /*
   2  * Copyright 1999-2020 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_type;
  86     HMAC_CTX *hmac = NULL;
  87     unsigned char key[EVP_MAX_MD_SIZE], *salt;
  88     int saltlen, iter;
  89     int md_size = 0;
  90     int md_type_nid;
  91     const X509_ALGOR *macalg;
  92     const ASN1_OBJECT *macoid;
  93
  94     if (pkcs12_key_gen == NULL)
  95         pkcs12_key_gen = PKCS12_key_gen_utf8;
  96
  97     if (!PKCS7_type_is_data(p12->authsafes)) {
  98         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_CONTENT_TYPE_NOT_DATA);
  99         return 0;
 100     }
 101
 102     salt = p12->mac->salt->data;
 103     saltlen = p12->mac->salt->length;
 104     if (p12->mac->iter == NULL)
 105         iter = 1;
 106     else
 107         iter = ASN1_INTEGER_get(p12->mac->iter);
 108     X509_SIG_get0(p12->mac->dinfo, &macalg, NULL);
 109     X509_ALGOR_get0(&macoid, NULL, NULL, macalg);
 110     if ((md_type = EVP_get_digestbyobj(macoid)) == NULL) {
 111         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
 112         return 0;
 113     }
 114     md_size = EVP_MD_size(md_type);
 115     md_type_nid = EVP_MD_type(md_type);
 116     if (md_size < 0)
 117         return 0;
 118     if ((md_type_nid == NID_id_GostR3411_94
 119          || md_type_nid == NID_id_GostR3411_2012_256
 120          || md_type_nid == NID_id_GostR3411_2012_512)
 121         && ossl_safe_getenv("LEGACY_GOST_PKCS12") == NULL) {
 122         md_size = TK26_MAC_KEY_LEN;
 123         if (!pkcs12_gen_gost_mac_key(pass, passlen, salt, saltlen, iter,
 124                                      md_size, key, md_type)) {
 125             ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
 126             goto err;
 127         }
 128     } else
 129         if (!(*pkcs12_key_gen)(pass, passlen, salt, saltlen, PKCS12_MAC_ID,
 130                                iter, md_size, key, md_type)) {
 131         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
 132         goto err;
 133     }
 134     if ((hmac = HMAC_CTX_new()) == NULL
 135         || !HMAC_Init_ex(hmac, key, md_size, md_type, NULL)
 136         || !HMAC_Update(hmac, p12->authsafes->d.data->data,
 137                         p12->authsafes->d.data->length)
 138         || !HMAC_Final(hmac, mac, maclen)) {
 139         goto err;
 140     }
 141     ret = 1;
 142
 143 err:
 144     OPENSSL_cleanse(key, sizeof(key));
 145     HMAC_CTX_free(hmac);
 146     return ret;
 147 }
 148
 149 int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
 150                    unsigned char *mac, unsigned int *maclen)
 151 {
 152     return pkcs12_gen_mac(p12, pass, passlen, mac, maclen, NULL);
 153 }
 154
 155 /* Verify the mac */
 156 int PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
 157 {
 158     unsigned char mac[EVP_MAX_MD_SIZE];
 159     unsigned int maclen;
 160     const ASN1_OCTET_STRING *macoct;
 161
 162     if (p12->mac == NULL) {
 163         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_ABSENT);
 164         return 0;
 165     }
 166     if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen,
 167                         PKCS12_key_gen_utf8)) {
 168         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_GENERATION_ERROR);
 169         return 0;
 170     }
 171     X509_SIG_get0(p12->mac->dinfo, NULL, &macoct);
 172     if ((maclen != (unsigned int)ASN1_STRING_length(macoct))
 173         || CRYPTO_memcmp(mac, ASN1_STRING_get0_data(macoct), maclen) != 0)
 174         return 0;
 175
 176     return 1;
 177 }
 178
 179 /* Set a mac */
 180
 181 int PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen,
 182                    unsigned char *salt, int saltlen, int iter,
 183                    const EVP_MD *md_type)
 184 {
 185     unsigned char mac[EVP_MAX_MD_SIZE];
 186     unsigned int maclen;
 187     ASN1_OCTET_STRING *macoct;
 188
 189     if (!md_type)
 190         md_type = EVP_sha1();
 191     if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) == PKCS12_ERROR) {
 192         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_SETUP_ERROR);
 193         return 0;
 194     }
 195     /*
 196      * Note that output mac is forced to UTF-8...
 197      */
 198     if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen,
 199                         PKCS12_key_gen_utf8)) {
 200         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_GENERATION_ERROR);
 201         return 0;
 202     }
 203     X509_SIG_getm(p12->mac->dinfo, NULL, &macoct);
 204     if (!ASN1_OCTET_STRING_set(macoct, mac, maclen)) {
 205         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_STRING_SET_ERROR);
 206         return 0;
 207     }
 208     return 1;
 209 }
 210
 211 /* Set up a mac structure */
 212 int PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
 213                      const EVP_MD *md_type)
 214 {
 215     X509_ALGOR *macalg;
 216
 217     PKCS12_MAC_DATA_free(p12->mac);
 218     p12->mac = NULL;
 219
 220     if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)
 221         return PKCS12_ERROR;
 222     if (iter > 1) {
 223         if ((p12->mac->iter = ASN1_INTEGER_new()) == NULL) {
 224             ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 225             return 0;
 226         }
 227         if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {
 228             ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 229             return 0;
 230         }
 231     }
 232     if (!saltlen)
 233         saltlen = PKCS12_SALT_LEN;
 234     if ((p12->mac->salt->data = OPENSSL_malloc(saltlen)) == NULL) {
 235         ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 236         return 0;
 237     }
 238     p12->mac->salt->length = saltlen;
 239     if (!salt) {
 240         if (RAND_bytes(p12->mac->salt->data, saltlen) <= 0)
 241             return 0;
 242     } else
 243         memcpy(p12->mac->salt->data, salt, saltlen);
 244     X509_SIG_getm(p12->mac->dinfo, &macalg, NULL);
 245     if (!X509_ALGOR_set0(macalg, OBJ_nid2obj(EVP_MD_type(md_type)),
 246                          V_ASN1_NULL, NULL)) {
 247         ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
 248         return 0;
 249     }
 250
 251     return 1;
 252 }