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openssl/providers/implementations/kdfs/pkcs12kdf.c
Tomas Mraz d2217c88df various kdfs: Always reset buflen after clearing the buffer 
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17165)
2021-11-30 11:52:10 +01:00

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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
*/
#include <openssl/trace.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include <openssl/core_names.h>
#include <openssl/proverr.h>
#include "internal/cryptlib.h"
#include "internal/numbers.h"
#include "crypto/evp.h"
#include "prov/provider_ctx.h"
#include "prov/providercommon.h"
#include "prov/implementations.h"
#include "prov/provider_util.h"
static OSSL_FUNC_kdf_newctx_fn kdf_pkcs12_new;
static OSSL_FUNC_kdf_freectx_fn kdf_pkcs12_free;
static OSSL_FUNC_kdf_reset_fn kdf_pkcs12_reset;
static OSSL_FUNC_kdf_derive_fn kdf_pkcs12_derive;
static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pkcs12_settable_ctx_params;
static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pkcs12_set_ctx_params;
static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pkcs12_gettable_ctx_params;
static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pkcs12_get_ctx_params;
typedef struct {
void *provctx;
PROV_DIGEST digest;
unsigned char *pass;
size_t pass_len;
unsigned char *salt;
size_t salt_len;
uint64_t iter;
int id;
} KDF_PKCS12;
/* PKCS12 compatible key/IV generation */
static int pkcs12kdf_derive(const unsigned char *pass, size_t passlen,
const unsigned char *salt, size_t saltlen,
int id, uint64_t iter, const EVP_MD *md_type,
unsigned char *out, size_t n)
{
unsigned char *B = NULL, *D = NULL, *I = NULL, *p = NULL, *Ai = NULL;
size_t Slen, Plen, Ilen;
size_t i, j, k, u, v;
uint64_t iter_cnt;
int ret = 0, ui, vi;
EVP_MD_CTX *ctx = NULL;
ctx = EVP_MD_CTX_new();
if (ctx == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
goto end;
}
vi = EVP_MD_get_block_size(md_type);
ui = EVP_MD_get_size(md_type);
if (ui <= 0 || vi <= 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST_SIZE);
goto end;
}
u = (size_t)ui;
v = (size_t)vi;
D = OPENSSL_malloc(v);
Ai = OPENSSL_malloc(u);
B = OPENSSL_malloc(v + 1);
Slen = v * ((saltlen + v - 1) / v);
if (passlen != 0)
Plen = v * ((passlen + v - 1) / v);
else
Plen = 0;
Ilen = Slen + Plen;
I = OPENSSL_malloc(Ilen);
if (D == NULL || Ai == NULL || B == NULL || I == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
goto end;
}
for (i = 0; i < v; i++)
D[i] = id;
p = I;
for (i = 0; i < Slen; i++)
*p++ = salt[i % saltlen];
for (i = 0; i < Plen; i++)
*p++ = pass[i % passlen];
for (;;) {
if (!EVP_DigestInit_ex(ctx, md_type, NULL)
|| !EVP_DigestUpdate(ctx, D, v)
|| !EVP_DigestUpdate(ctx, I, Ilen)
|| !EVP_DigestFinal_ex(ctx, Ai, NULL))
goto end;
for (iter_cnt = 1; iter_cnt < iter; iter_cnt++) {
if (!EVP_DigestInit_ex(ctx, md_type, NULL)
|| !EVP_DigestUpdate(ctx, Ai, u)
|| !EVP_DigestFinal_ex(ctx, Ai, NULL))
goto end;
}
memcpy(out, Ai, n < u ? n : u);
if (u >= n) {
ret = 1;
break;
}
n -= u;
out += u;
for (j = 0; j < v; j++)
B[j] = Ai[j % u];
for (j = 0; j < Ilen; j += v) {
unsigned char *Ij = I + j;
uint16_t c = 1;
/* Work out Ij = Ij + B + 1 */
for (k = v; k > 0;) {
k--;
c += Ij[k] + B[k];
Ij[k] = (unsigned char)c;
c >>= 8;
}
}
}
end:
OPENSSL_free(Ai);
OPENSSL_free(B);
OPENSSL_free(D);
OPENSSL_free(I);
EVP_MD_CTX_free(ctx);
return ret;
}
static void *kdf_pkcs12_new(void *provctx)
{
KDF_PKCS12 *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return NULL;
}
ctx->provctx = provctx;
return ctx;
}
static void kdf_pkcs12_cleanup(KDF_PKCS12 *ctx)
{
ossl_prov_digest_reset(&ctx->digest);
OPENSSL_free(ctx->salt);
OPENSSL_clear_free(ctx->pass, ctx->pass_len);
memset(ctx, 0, sizeof(*ctx));
}
static void kdf_pkcs12_free(void *vctx)
{
KDF_PKCS12 *ctx = (KDF_PKCS12 *)vctx;
if (ctx != NULL) {
kdf_pkcs12_cleanup(ctx);
OPENSSL_free(ctx);
}
}
static void kdf_pkcs12_reset(void *vctx)
{
KDF_PKCS12 *ctx = (KDF_PKCS12 *)vctx;
void *provctx = ctx->provctx;
kdf_pkcs12_cleanup(ctx);
ctx->provctx = provctx;
}
static int pkcs12kdf_set_membuf(unsigned char **buffer, size_t *buflen,
const OSSL_PARAM *p)
{
OPENSSL_clear_free(*buffer, *buflen);
*buffer = NULL;
*buflen = 0;
if (p->data_size == 0) {
if ((*buffer = OPENSSL_malloc(1)) == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return 0;
}
} else if (p->data != NULL) {
if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
return 0;
}
return 1;
}
static int kdf_pkcs12_derive(void *vctx, unsigned char *key, size_t keylen,
const OSSL_PARAM params[])
{
KDF_PKCS12 *ctx = (KDF_PKCS12 *)vctx;
const EVP_MD *md;
if (!ossl_prov_is_running() || !kdf_pkcs12_set_ctx_params(ctx, params))
return 0;
if (ctx->pass == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
return 0;
}
if (ctx->salt == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
return 0;
}
md = ossl_prov_digest_md(&ctx->digest);
return pkcs12kdf_derive(ctx->pass, ctx->pass_len, ctx->salt, ctx->salt_len,
ctx->id, ctx->iter, md, key, keylen);
}
static int kdf_pkcs12_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
const OSSL_PARAM *p;
KDF_PKCS12 *ctx = vctx;
OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
if (params == NULL)
return 1;
if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
if (!pkcs12kdf_set_membuf(&ctx->pass, &ctx->pass_len, p))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL)
if (!pkcs12kdf_set_membuf(&ctx->salt, &ctx->salt_len, p))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PKCS12_ID)) != NULL)
if (!OSSL_PARAM_get_int(p, &ctx->id))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_ITER)) != NULL)
if (!OSSL_PARAM_get_uint64(p, &ctx->iter))
return 0;
return 1;
}
static const OSSL_PARAM *kdf_pkcs12_settable_ctx_params(
ossl_unused void *ctx, ossl_unused void *provctx)
{
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
OSSL_PARAM_uint64(OSSL_KDF_PARAM_ITER, NULL),
OSSL_PARAM_int(OSSL_KDF_PARAM_PKCS12_ID, NULL),
OSSL_PARAM_END
};
return known_settable_ctx_params;
}
static int kdf_pkcs12_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
return OSSL_PARAM_set_size_t(p, SIZE_MAX);
return -2;
}
static const OSSL_PARAM *kdf_pkcs12_gettable_ctx_params(
ossl_unused void *ctx, ossl_unused void *provctx)
{
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
OSSL_PARAM_END
};
return known_gettable_ctx_params;
}
const OSSL_DISPATCH ossl_kdf_pkcs12_functions[] = {
{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pkcs12_new },
{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pkcs12_free },
{ OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pkcs12_reset },
{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pkcs12_derive },
{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
(void(*)(void))kdf_pkcs12_settable_ctx_params },
{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pkcs12_set_ctx_params },
{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
(void(*)(void))kdf_pkcs12_gettable_ctx_params },
{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pkcs12_get_ctx_params },
{ 0, NULL }
};
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