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/*
* PKCS#12 Personal Information Exchange Syntax
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
/*
* The PKCS #12 Personal Information Exchange Syntax Standard v1.1
*
* http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
* ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
*/
#include "common.h"
#if defined(MBEDTLS_PKCS12_C)
#include "mbedtls/pkcs12.h"
#include "mbedtls/asn1.h"
#if defined(MBEDTLS_CIPHER_C)
#include "mbedtls/cipher.h"
#endif /* MBEDTLS_CIPHER_C */
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include <string.h>
#if defined(MBEDTLS_DES_C)
#include "mbedtls/des.h"
#endif
#include "psa_util_internal.h"
#if defined(MBEDTLS_ASN1_PARSE_C) && defined(MBEDTLS_CIPHER_C)
static int pkcs12_parse_pbe_params(mbedtls_asn1_buf *params,
mbedtls_asn1_buf *salt, int *iterations)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char **p = ¶ms->p;
const unsigned char *end = params->p + params->len;
/*
* pkcs-12PbeParams ::= SEQUENCE {
* salt OCTET STRING,
* iterations INTEGER
* }
*
*/
if (params->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
if ((ret = mbedtls_asn1_get_tag(p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, ret);
}
salt->p = *p;
*p += salt->len;
if ((ret = mbedtls_asn1_get_int(p, end, iterations)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, ret);
}
if (*p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
#define PKCS12_MAX_PWDLEN 128
static int pkcs12_pbe_derive_key_iv(mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
const unsigned char *pwd, size_t pwdlen,
unsigned char *key, size_t keylen,
unsigned char *iv, size_t ivlen)
{
int ret, iterations = 0;
mbedtls_asn1_buf salt;
size_t i;
unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
if (pwdlen > PKCS12_MAX_PWDLEN) {
return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
}
memset(&salt, 0, sizeof(mbedtls_asn1_buf));
memset(&unipwd, 0, sizeof(unipwd));
if ((ret = pkcs12_parse_pbe_params(pbe_params, &salt,
&iterations)) != 0) {
return ret;
}
for (i = 0; i < pwdlen; i++) {
unipwd[i * 2 + 1] = pwd[i];
}
if ((ret = mbedtls_pkcs12_derivation(key, keylen, unipwd, pwdlen * 2 + 2,
salt.p, salt.len, md_type,
MBEDTLS_PKCS12_DERIVE_KEY, iterations)) != 0) {
return ret;
}
if (iv == NULL || ivlen == 0) {
return 0;
}
if ((ret = mbedtls_pkcs12_derivation(iv, ivlen, unipwd, pwdlen * 2 + 2,
salt.p, salt.len, md_type,
MBEDTLS_PKCS12_DERIVE_IV, iterations)) != 0) {
return ret;
}
return 0;
}
#undef PKCS12_MAX_PWDLEN
#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
int mbedtls_pkcs12_pbe_ext(mbedtls_asn1_buf *pbe_params, int mode,
mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *data, size_t len,
unsigned char *output, size_t output_size,
size_t *output_len);
#endif
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
int mbedtls_pkcs12_pbe(mbedtls_asn1_buf *pbe_params, int mode,
mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *data, size_t len,
unsigned char *output)
{
size_t output_len = 0;
/* We assume caller of the function is providing a big enough output buffer
* so we pass output_size as SIZE_MAX to pass checks, However, no guarantees
* for the output size actually being correct.
*/
return mbedtls_pkcs12_pbe_ext(pbe_params, mode, cipher_type, md_type,
pwd, pwdlen, data, len, output, SIZE_MAX,
&output_len);
}
#endif
int mbedtls_pkcs12_pbe_ext(mbedtls_asn1_buf *pbe_params, int mode,
mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *data, size_t len,
unsigned char *output, size_t output_size,
size_t *output_len)
{
int ret, keylen = 0;
unsigned char key[32];
unsigned char iv[16];
const mbedtls_cipher_info_t *cipher_info;
mbedtls_cipher_context_t cipher_ctx;
size_t iv_len = 0;
size_t finish_olen = 0;
unsigned int padlen = 0;
if (pwd == NULL && pwdlen != 0) {
return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
}
cipher_info = mbedtls_cipher_info_from_type(cipher_type);
if (cipher_info == NULL) {
return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
}
keylen = (int) mbedtls_cipher_info_get_key_bitlen(cipher_info) / 8;
if (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
if (output_size < len) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
}
if (mode == MBEDTLS_PKCS12_PBE_ENCRYPT) {
padlen = cipher_info->block_size - (len % cipher_info->block_size);
if (output_size < (len + padlen)) {
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
}
}
iv_len = mbedtls_cipher_info_get_iv_size(cipher_info);
if ((ret = pkcs12_pbe_derive_key_iv(pbe_params, md_type, pwd, pwdlen,
key, keylen,
iv, iv_len)) != 0) {
return ret;
}
mbedtls_cipher_init(&cipher_ctx);
if ((ret = mbedtls_cipher_setup(&cipher_ctx, cipher_info)) != 0) {
goto exit;
}
if ((ret = mbedtls_cipher_setkey(&cipher_ctx, key, 8 * keylen,
(mbedtls_operation_t) mode)) != 0) {
goto exit;
}
#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
{
/* PKCS12 uses CBC with PKCS7 padding */
mbedtls_cipher_padding_t padding = MBEDTLS_PADDING_PKCS7;
#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
/* For historical reasons, when decrypting, this function works when
* decrypting even when support for PKCS7 padding is disabled. In this
* case, it ignores the padding, and so will never report a
* password mismatch.
*/
if (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
padding = MBEDTLS_PADDING_NONE;
}
#endif
if ((ret = mbedtls_cipher_set_padding_mode(&cipher_ctx, padding)) != 0) {
goto exit;
}
}
#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
ret = mbedtls_cipher_crypt(&cipher_ctx, iv, iv_len, data, len, output, &finish_olen);
if (ret == MBEDTLS_ERR_CIPHER_INVALID_PADDING) {
ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
}
*output_len += finish_olen;
exit:
mbedtls_platform_zeroize(key, sizeof(key));
mbedtls_platform_zeroize(iv, sizeof(iv));
mbedtls_cipher_free(&cipher_ctx);
return ret;
}
#endif /* MBEDTLS_ASN1_PARSE_C && MBEDTLS_CIPHER_C */
static void pkcs12_fill_buffer(unsigned char *data, size_t data_len,
const unsigned char *filler, size_t fill_len)
{
unsigned char *p = data;
size_t use_len;
if (filler != NULL && fill_len != 0) {
while (data_len > 0) {
use_len = (data_len > fill_len) ? fill_len : data_len;
memcpy(p, filler, use_len);
p += use_len;
data_len -= use_len;
}
} else {
/* If either of the above are not true then clearly there is nothing
* that this function can do. The function should *not* be called
* under either of those circumstances, as you could end up with an
* incorrect output but for safety's sake, leaving the check in as
* otherwise we could end up with memory corruption.*/
}
}
static int calculate_hashes(mbedtls_md_type_t md_type, int iterations,
unsigned char *diversifier, unsigned char *salt_block,
unsigned char *pwd_block, unsigned char *hash_output, int use_salt,
int use_password, size_t hlen, size_t v)
{
int ret = -1;
size_t i;
const mbedtls_md_info_t *md_info;
mbedtls_md_context_t md_ctx;
md_info = mbedtls_md_info_from_type(md_type);
if (md_info == NULL) {
return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
}
mbedtls_md_init(&md_ctx);
if ((ret = mbedtls_md_setup(&md_ctx, md_info, 0)) != 0) {
return ret;
}
// Calculate hash( diversifier || salt_block || pwd_block )
if ((ret = mbedtls_md_starts(&md_ctx)) != 0) {
goto exit;
}
if ((ret = mbedtls_md_update(&md_ctx, diversifier, v)) != 0) {
goto exit;
}
if (use_salt != 0) {
if ((ret = mbedtls_md_update(&md_ctx, salt_block, v)) != 0) {
goto exit;
}
}
if (use_password != 0) {
if ((ret = mbedtls_md_update(&md_ctx, pwd_block, v)) != 0) {
goto exit;
}
}
if ((ret = mbedtls_md_finish(&md_ctx, hash_output)) != 0) {
goto exit;
}
// Perform remaining ( iterations - 1 ) recursive hash calculations
for (i = 1; i < (size_t) iterations; i++) {
if ((ret = mbedtls_md(md_info, hash_output, hlen, hash_output))
!= 0) {
goto exit;
}
}
exit:
mbedtls_md_free(&md_ctx);
return ret;
}
int mbedtls_pkcs12_derivation(unsigned char *data, size_t datalen,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *salt, size_t saltlen,
mbedtls_md_type_t md_type, int id, int iterations)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned int j;
unsigned char diversifier[128];
unsigned char salt_block[128], pwd_block[128], hash_block[128] = { 0 };
unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
unsigned char *p;
unsigned char c;
int use_password = 0;
int use_salt = 0;
size_t hlen, use_len, v, i;
// This version only allows max of 64 bytes of password or salt
if (datalen > 128 || pwdlen > 64 || saltlen > 64) {
return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
}
if (pwd == NULL && pwdlen != 0) {
return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
}
if (salt == NULL && saltlen != 0) {
return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
}
use_password = (pwd && pwdlen != 0);
use_salt = (salt && saltlen != 0);
hlen = mbedtls_md_get_size_from_type(md_type);
if (hlen <= 32) {
v = 64;
} else {
v = 128;
}
memset(diversifier, (unsigned char) id, v);
if (use_salt != 0) {
pkcs12_fill_buffer(salt_block, v, salt, saltlen);
}
if (use_password != 0) {
pkcs12_fill_buffer(pwd_block, v, pwd, pwdlen);
}
p = data;
while (datalen > 0) {
if (calculate_hashes(md_type, iterations, diversifier, salt_block,
pwd_block, hash_output, use_salt, use_password, hlen,
v) != 0) {
goto exit;
}
use_len = (datalen > hlen) ? hlen : datalen;
memcpy(p, hash_output, use_len);
datalen -= use_len;
p += use_len;
if (datalen == 0) {
break;
}
// Concatenating copies of hash_output into hash_block (B)
pkcs12_fill_buffer(hash_block, v, hash_output, hlen);
// B += 1
for (i = v; i > 0; i--) {
if (++hash_block[i - 1] != 0) {
break;
}
}
if (use_salt != 0) {
// salt_block += B
c = 0;
for (i = v; i > 0; i--) {
j = salt_block[i - 1] + hash_block[i - 1] + c;
c = MBEDTLS_BYTE_1(j);
salt_block[i - 1] = MBEDTLS_BYTE_0(j);
}
}
if (use_password != 0) {
// pwd_block += B
c = 0;
for (i = v; i > 0; i--) {
j = pwd_block[i - 1] + hash_block[i - 1] + c;
c = MBEDTLS_BYTE_1(j);
pwd_block[i - 1] = MBEDTLS_BYTE_0(j);
}
}
}
ret = 0;
exit:
mbedtls_platform_zeroize(salt_block, sizeof(salt_block));
mbedtls_platform_zeroize(pwd_block, sizeof(pwd_block));
mbedtls_platform_zeroize(hash_block, sizeof(hash_block));
mbedtls_platform_zeroize(hash_output, sizeof(hash_output));
return ret;
}
#endif /* MBEDTLS_PKCS12_C */
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