468 lines
14 KiB
C
468 lines
14 KiB
C
/*
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* PKCS#12 Personal Information Exchange Syntax
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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/*
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* The PKCS #12 Personal Information Exchange Syntax Standard v1.1
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*
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* http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
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* ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
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*/
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#include "common.h"
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#if defined(MBEDTLS_PKCS12_C)
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#include "mbedtls/pkcs12.h"
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#include "mbedtls/asn1.h"
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#include "mbedtls/cipher.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include <string.h>
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#if defined(MBEDTLS_ARC4_C)
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#include "mbedtls/arc4.h"
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#endif
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#if defined(MBEDTLS_DES_C)
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#include "mbedtls/des.h"
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#endif
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#if defined(MBEDTLS_ASN1_PARSE_C)
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static int pkcs12_parse_pbe_params(mbedtls_asn1_buf *params,
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mbedtls_asn1_buf *salt, int *iterations)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char **p = ¶ms->p;
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const unsigned char *end = params->p + params->len;
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/*
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* pkcs-12PbeParams ::= SEQUENCE {
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* salt OCTET STRING,
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* iterations INTEGER
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* }
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*
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*/
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if (params->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
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}
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if ((ret = mbedtls_asn1_get_tag(p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, ret);
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}
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salt->p = *p;
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*p += salt->len;
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if ((ret = mbedtls_asn1_get_int(p, end, iterations)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, ret);
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}
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if (*p != end) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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return 0;
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}
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#define PKCS12_MAX_PWDLEN 128
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static int pkcs12_pbe_derive_key_iv(mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
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const unsigned char *pwd, size_t pwdlen,
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unsigned char *key, size_t keylen,
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unsigned char *iv, size_t ivlen)
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{
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int ret, iterations = 0;
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mbedtls_asn1_buf salt;
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size_t i;
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unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
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if (pwdlen > PKCS12_MAX_PWDLEN) {
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return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
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}
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memset(&salt, 0, sizeof(mbedtls_asn1_buf));
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memset(&unipwd, 0, sizeof(unipwd));
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if ((ret = pkcs12_parse_pbe_params(pbe_params, &salt,
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&iterations)) != 0) {
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return ret;
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}
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for (i = 0; i < pwdlen; i++) {
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unipwd[i * 2 + 1] = pwd[i];
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}
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if ((ret = mbedtls_pkcs12_derivation(key, keylen, unipwd, pwdlen * 2 + 2,
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salt.p, salt.len, md_type,
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MBEDTLS_PKCS12_DERIVE_KEY, iterations)) != 0) {
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return ret;
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}
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if (iv == NULL || ivlen == 0) {
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return 0;
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}
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if ((ret = mbedtls_pkcs12_derivation(iv, ivlen, unipwd, pwdlen * 2 + 2,
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salt.p, salt.len, md_type,
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MBEDTLS_PKCS12_DERIVE_IV, iterations)) != 0) {
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return ret;
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}
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return 0;
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}
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#undef PKCS12_MAX_PWDLEN
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int mbedtls_pkcs12_pbe_sha1_rc4_128(mbedtls_asn1_buf *pbe_params, int mode,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *data, size_t len,
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unsigned char *output)
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{
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#if !defined(MBEDTLS_ARC4_C)
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((void) pbe_params);
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((void) mode);
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((void) pwd);
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((void) pwdlen);
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((void) data);
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((void) len);
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((void) output);
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return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
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#else
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char key[16];
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mbedtls_arc4_context ctx;
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((void) mode);
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mbedtls_arc4_init(&ctx);
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if ((ret = pkcs12_pbe_derive_key_iv(pbe_params, MBEDTLS_MD_SHA1,
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pwd, pwdlen,
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key, 16, NULL, 0)) != 0) {
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return ret;
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}
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mbedtls_arc4_setup(&ctx, key, 16);
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if ((ret = mbedtls_arc4_crypt(&ctx, len, data, output)) != 0) {
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goto exit;
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}
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exit:
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mbedtls_platform_zeroize(key, sizeof(key));
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mbedtls_arc4_free(&ctx);
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return ret;
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#endif /* MBEDTLS_ARC4_C */
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}
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#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
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int mbedtls_pkcs12_pbe_ext(mbedtls_asn1_buf *pbe_params, int mode,
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mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *data, size_t len,
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unsigned char *output, size_t output_size,
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size_t *output_len);
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#endif
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int mbedtls_pkcs12_pbe(mbedtls_asn1_buf *pbe_params, int mode,
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mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *data, size_t len,
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unsigned char *output)
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{
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size_t output_len = 0;
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/* We assume caller of the function is providing a big enough output buffer
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* so we pass output_size as SIZE_MAX to pass checks, However, no guarantees
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* for the output size actually being correct.
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*/
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return mbedtls_pkcs12_pbe_ext(pbe_params, mode, cipher_type, md_type,
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pwd, pwdlen, data, len, output, SIZE_MAX,
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&output_len);
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}
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int mbedtls_pkcs12_pbe_ext(mbedtls_asn1_buf *pbe_params, int mode,
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mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *data, size_t len,
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unsigned char *output, size_t output_size,
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size_t *output_len)
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{
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int ret, keylen = 0;
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unsigned char key[32];
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unsigned char iv[16];
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const mbedtls_cipher_info_t *cipher_info;
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mbedtls_cipher_context_t cipher_ctx;
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size_t finish_olen = 0;
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unsigned int padlen = 0;
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if (pwd == NULL && pwdlen != 0) {
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return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
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}
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cipher_info = mbedtls_cipher_info_from_type(cipher_type);
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if (cipher_info == NULL) {
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return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
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}
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keylen = cipher_info->key_bitlen / 8;
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if (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
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if (output_size < len) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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}
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if (mode == MBEDTLS_PKCS12_PBE_ENCRYPT) {
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padlen = cipher_info->block_size - (len % cipher_info->block_size);
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if (output_size < (len + padlen)) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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}
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if ((ret = pkcs12_pbe_derive_key_iv(pbe_params, md_type, pwd, pwdlen,
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key, keylen,
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iv, cipher_info->iv_size)) != 0) {
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return ret;
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}
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mbedtls_cipher_init(&cipher_ctx);
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if ((ret = mbedtls_cipher_setup(&cipher_ctx, cipher_info)) != 0) {
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goto exit;
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}
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if ((ret =
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mbedtls_cipher_setkey(&cipher_ctx, key, 8 * keylen,
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(mbedtls_operation_t) mode)) != 0) {
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goto exit;
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}
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#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
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/* PKCS12 uses CBC with PKCS7 padding */
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mbedtls_cipher_padding_t padding = MBEDTLS_PADDING_PKCS7;
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#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
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/* For historical reasons, when decrypting, this function works when
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* decrypting even when support for PKCS7 padding is disabled. In this
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* case, it ignores the padding, and so will never report a
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* password mismatch.
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*/
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if (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
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padding = MBEDTLS_PADDING_NONE;
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}
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#endif
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if ((ret = mbedtls_cipher_set_padding_mode(&cipher_ctx, padding)) != 0) {
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goto exit;
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}
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#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
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if ((ret = mbedtls_cipher_set_iv(&cipher_ctx, iv, cipher_info->iv_size)) != 0) {
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goto exit;
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}
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if ((ret = mbedtls_cipher_reset(&cipher_ctx)) != 0) {
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goto exit;
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}
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if ((ret = mbedtls_cipher_update(&cipher_ctx, data, len,
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output, output_len)) != 0) {
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goto exit;
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}
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if ((ret = mbedtls_cipher_finish(&cipher_ctx, output + (*output_len), &finish_olen)) != 0) {
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ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
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}
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*output_len += finish_olen;
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exit:
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mbedtls_platform_zeroize(key, sizeof(key));
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mbedtls_platform_zeroize(iv, sizeof(iv));
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mbedtls_cipher_free(&cipher_ctx);
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return ret;
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}
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#endif /* MBEDTLS_ASN1_PARSE_C */
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static void pkcs12_fill_buffer(unsigned char *data, size_t data_len,
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const unsigned char *filler, size_t fill_len)
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{
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unsigned char *p = data;
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size_t use_len;
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if (filler != NULL && fill_len != 0) {
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while (data_len > 0) {
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use_len = (data_len > fill_len) ? fill_len : data_len;
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memcpy(p, filler, use_len);
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p += use_len;
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data_len -= use_len;
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}
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} else {
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/* If either of the above are not true then clearly there is nothing
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* that this function can do. The function should *not* be called
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* under either of those circumstances, as you could end up with an
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* incorrect output but for safety's sake, leaving the check in as
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* otherwise we could end up with memory corruption.*/
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}
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}
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int mbedtls_pkcs12_derivation(unsigned char *data, size_t datalen,
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const unsigned char *pwd, size_t pwdlen,
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const unsigned char *salt, size_t saltlen,
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mbedtls_md_type_t md_type, int id, int iterations)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned int j;
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unsigned char diversifier[128];
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unsigned char salt_block[128], pwd_block[128], hash_block[128];
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unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
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unsigned char *p;
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unsigned char c;
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int use_password = 0;
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int use_salt = 0;
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size_t hlen, use_len, v, i;
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const mbedtls_md_info_t *md_info;
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mbedtls_md_context_t md_ctx;
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// This version only allows max of 64 bytes of password or salt
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if (datalen > 128 || pwdlen > 64 || saltlen > 64) {
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return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
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}
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if (pwd == NULL && pwdlen != 0) {
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return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
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}
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if (salt == NULL && saltlen != 0) {
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return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
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}
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use_password = (pwd && pwdlen != 0);
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use_salt = (salt && saltlen != 0);
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md_info = mbedtls_md_info_from_type(md_type);
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if (md_info == NULL) {
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return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
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}
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mbedtls_md_init(&md_ctx);
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if ((ret = mbedtls_md_setup(&md_ctx, md_info, 0)) != 0) {
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return ret;
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}
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hlen = mbedtls_md_get_size(md_info);
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if (hlen <= 32) {
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v = 64;
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} else {
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v = 128;
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}
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memset(diversifier, (unsigned char) id, v);
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if (use_salt != 0) {
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pkcs12_fill_buffer(salt_block, v, salt, saltlen);
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}
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if (use_password != 0) {
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pkcs12_fill_buffer(pwd_block, v, pwd, pwdlen);
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}
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p = data;
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while (datalen > 0) {
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// Calculate hash( diversifier || salt_block || pwd_block )
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if ((ret = mbedtls_md_starts(&md_ctx)) != 0) {
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goto exit;
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}
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if ((ret = mbedtls_md_update(&md_ctx, diversifier, v)) != 0) {
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goto exit;
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}
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if (use_salt != 0) {
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if ((ret = mbedtls_md_update(&md_ctx, salt_block, v)) != 0) {
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goto exit;
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}
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}
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if (use_password != 0) {
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if ((ret = mbedtls_md_update(&md_ctx, pwd_block, v)) != 0) {
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goto exit;
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}
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}
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if ((ret = mbedtls_md_finish(&md_ctx, hash_output)) != 0) {
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goto exit;
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}
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// Perform remaining ( iterations - 1 ) recursive hash calculations
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for (i = 1; i < (size_t) iterations; i++) {
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if ((ret = mbedtls_md(md_info, hash_output, hlen, hash_output)) != 0) {
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goto exit;
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}
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}
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use_len = (datalen > hlen) ? hlen : datalen;
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memcpy(p, hash_output, use_len);
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datalen -= use_len;
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p += use_len;
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if (datalen == 0) {
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break;
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}
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// Concatenating copies of hash_output into hash_block (B)
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pkcs12_fill_buffer(hash_block, v, hash_output, hlen);
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// B += 1
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for (i = v; i > 0; i--) {
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if (++hash_block[i - 1] != 0) {
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break;
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}
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}
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if (use_salt != 0) {
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// salt_block += B
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c = 0;
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for (i = v; i > 0; i--) {
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j = salt_block[i - 1] + hash_block[i - 1] + c;
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c = MBEDTLS_BYTE_1(j);
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salt_block[i - 1] = MBEDTLS_BYTE_0(j);
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}
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}
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if (use_password != 0) {
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// pwd_block += B
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c = 0;
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for (i = v; i > 0; i--) {
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j = pwd_block[i - 1] + hash_block[i - 1] + c;
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c = MBEDTLS_BYTE_1(j);
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pwd_block[i - 1] = MBEDTLS_BYTE_0(j);
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}
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}
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}
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ret = 0;
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exit:
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mbedtls_platform_zeroize(salt_block, sizeof(salt_block));
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mbedtls_platform_zeroize(pwd_block, sizeof(pwd_block));
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mbedtls_platform_zeroize(hash_block, sizeof(hash_block));
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mbedtls_platform_zeroize(hash_output, sizeof(hash_output));
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mbedtls_md_free(&md_ctx);
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return ret;
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}
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#endif /* MBEDTLS_PKCS12_C */
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