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openssl/crypto/pkcs12/p12_mutl.c
Pauli 9428977994 pkcs12: fix Coverity 1485667 logically dead code 
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15635)
2021-06-08 19:32:17 +10:00

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/*
* Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* HMAC low level APIs are deprecated for public use, but still ok for internal
* use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/crypto.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/pkcs12.h>
#include "p12_local.h"
int PKCS12_mac_present(const PKCS12 *p12)
{
return p12->mac ? 1 : 0;
}
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)
{
if (p12->mac) {
X509_SIG_get0(p12->mac->dinfo, pmacalg, pmac);
if (psalt)
*psalt = p12->mac->salt;
if (piter)
*piter = p12->mac->iter;
} else {
if (pmac)
*pmac = NULL;
if (pmacalg)
*pmacalg = NULL;
if (psalt)
*psalt = NULL;
if (piter)
*piter = NULL;
}
}
#define TK26_MAC_KEY_LEN 32
static int pkcs12_gen_gost_mac_key(const char *pass, int passlen,
const unsigned char *salt, int saltlen,
int iter, int keylen, unsigned char *key,
const EVP_MD *digest)
{
unsigned char out[96];
if (keylen != TK26_MAC_KEY_LEN) {
return 0;
}
if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter,
digest, sizeof(out), out)) {
return 0;
}
memcpy(key, out + sizeof(out) - TK26_MAC_KEY_LEN, TK26_MAC_KEY_LEN);
OPENSSL_cleanse(out, sizeof(out));
return 1;
}
/* Generate a MAC */
static int pkcs12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
unsigned char *mac, unsigned int *maclen,
int (*pkcs12_key_gen)(const char *pass, int passlen,
unsigned char *salt, int slen,
int id, int iter, int n,
unsigned char *out,
const EVP_MD *md_type))
{
int ret = 0;
const EVP_MD *md;
EVP_MD *md_fetch;
HMAC_CTX *hmac = NULL;
unsigned char key[EVP_MAX_MD_SIZE], *salt;
int saltlen, iter;
char md_name[80];
int md_size = 0;
int md_nid;
const X509_ALGOR *macalg;
const ASN1_OBJECT *macoid;
if (!PKCS7_type_is_data(p12->authsafes)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_CONTENT_TYPE_NOT_DATA);
return 0;
}
salt = p12->mac->salt->data;
saltlen = p12->mac->salt->length;
if (p12->mac->iter == NULL)
iter = 1;
else
iter = ASN1_INTEGER_get(p12->mac->iter);
X509_SIG_get0(p12->mac->dinfo, &macalg, NULL);
X509_ALGOR_get0(&macoid, NULL, NULL, macalg);
if (OBJ_obj2txt(md_name, sizeof(md_name), macoid, 0) < 0)
return 0;
md = md_fetch = EVP_MD_fetch(p12->authsafes->ctx.libctx, md_name,
p12->authsafes->ctx.propq);
if (md == NULL)
md = EVP_get_digestbynid(OBJ_obj2nid(macoid));
if (md == NULL) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
return 0;
}
md_size = EVP_MD_get_size(md);
md_nid = EVP_MD_get_type(md);
if (md_size < 0)
goto err;
if ((md_nid == NID_id_GostR3411_94
|| md_nid == NID_id_GostR3411_2012_256
|| md_nid == NID_id_GostR3411_2012_512)
&& ossl_safe_getenv("LEGACY_GOST_PKCS12") == NULL) {
md_size = TK26_MAC_KEY_LEN;
if (!pkcs12_gen_gost_mac_key(pass, passlen, salt, saltlen, iter,
md_size, key, md)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
goto err;
}
} else {
if (pkcs12_key_gen != NULL) {
if (!(*pkcs12_key_gen)(pass, passlen, salt, saltlen, PKCS12_MAC_ID,
iter, md_size, key, md)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
goto err;
}
} else {
/* Default to UTF-8 password */
if (!PKCS12_key_gen_utf8_ex(pass, passlen, salt, saltlen, PKCS12_MAC_ID,
iter, md_size, key, md,
p12->authsafes->ctx.libctx,
p12->authsafes->ctx.propq)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_KEY_GEN_ERROR);
goto err;
}
}
}
if ((hmac = HMAC_CTX_new()) == NULL
|| !HMAC_Init_ex(hmac, key, md_size, md, NULL)
|| !HMAC_Update(hmac, p12->authsafes->d.data->data,
p12->authsafes->d.data->length)
|| !HMAC_Final(hmac, mac, maclen)) {
goto err;
}
ret = 1;
err:
OPENSSL_cleanse(key, sizeof(key));
HMAC_CTX_free(hmac);
EVP_MD_free(md_fetch);
return ret;
}
int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
unsigned char *mac, unsigned int *maclen)
{
return pkcs12_gen_mac(p12, pass, passlen, mac, maclen, NULL);
}
/* Verify the mac */
int PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
{
unsigned char mac[EVP_MAX_MD_SIZE];
unsigned int maclen;
const ASN1_OCTET_STRING *macoct;
if (p12->mac == NULL) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_ABSENT);
return 0;
}
if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen, NULL)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
X509_SIG_get0(p12->mac->dinfo, NULL, &macoct);
if ((maclen != (unsigned int)ASN1_STRING_length(macoct))
|| CRYPTO_memcmp(mac, ASN1_STRING_get0_data(macoct), maclen) != 0)
return 0;
return 1;
}
/* Set a mac */
int PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen,
unsigned char *salt, int saltlen, int iter,
const EVP_MD *md_type)
{
unsigned char mac[EVP_MAX_MD_SIZE];
unsigned int maclen;
ASN1_OCTET_STRING *macoct;
if (md_type == NULL)
/* No need to do a fetch as the md_type is used only to get a NID */
md_type = EVP_sha256();
if (!iter)
iter = PKCS12_DEFAULT_ITER;
if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) == PKCS12_ERROR) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_SETUP_ERROR);
return 0;
}
/*
* Note that output mac is forced to UTF-8...
*/
if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen, NULL)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
X509_SIG_getm(p12->mac->dinfo, NULL, &macoct);
if (!ASN1_OCTET_STRING_set(macoct, mac, maclen)) {
ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_STRING_SET_ERROR);
return 0;
}
return 1;
}
/* Set up a mac structure */
int PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
const EVP_MD *md_type)
{
X509_ALGOR *macalg;
PKCS12_MAC_DATA_free(p12->mac);
p12->mac = NULL;
if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)
return PKCS12_ERROR;
if (iter > 1) {
if ((p12->mac->iter = ASN1_INTEGER_new()) == NULL) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
return 0;
}
}
if (saltlen == 0)
saltlen = PKCS12_SALT_LEN;
else if (saltlen < 0)
return 0;
if ((p12->mac->salt->data = OPENSSL_malloc(saltlen)) == NULL) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
return 0;
}
p12->mac->salt->length = saltlen;
if (salt == NULL) {
if (RAND_bytes_ex(p12->authsafes->ctx.libctx, p12->mac->salt->data,
(size_t)saltlen, 0) <= 0)
return 0;
} else {
memcpy(p12->mac->salt->data, salt, saltlen);
}
X509_SIG_getm(p12->mac->dinfo, &macalg, NULL);
if (!X509_ALGOR_set0(macalg, OBJ_nid2obj(EVP_MD_get_type(md_type)),
V_ASN1_NULL, NULL)) {
ERR_raise(ERR_LIB_PKCS12, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
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