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openssl/providers/implementations/kdfs/kbkdf.c
Pauli 3c65941546 kdfs: make free calls check for NULL. 
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10496)
2019-11-22 15:19:28 +10:00

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/*
* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2019 Red Hat, Inc.
*
* 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
*/
/*
* This implements https://csrc.nist.gov/publications/detail/sp/800-108/final
* section 5.1 ("counter mode") and section 5.2 ("feedback mode") in both HMAC
* and CMAC. That document does not name the KDFs it defines; the name is
* derived from
* https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/Key-Derivation
*
* Note that section 5.3 ("double-pipeline mode") is not implemented, though
* it would be possible to do so in the future.
*
* These versions all assume the counter is used. It would be relatively
* straightforward to expose a configuration handle should the need arise.
*
* Variable names attempt to match those of SP800-108.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/core_names.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/kdf.h>
#include <openssl/params.h>
#include "internal/cryptlib.h"
#include "crypto/evp.h"
#include "internal/numbers.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "prov/provider_util.h"
#include "prov/providercommonerr.h"
#include "e_os.h"
#define MIN(a, b) ((a) < (b)) ? (a) : (b)
typedef enum {
COUNTER = 0,
FEEDBACK
} kbkdf_mode;
/* Our context structure. */
typedef struct {
void *provctx;
kbkdf_mode mode;
EVP_MAC_CTX *ctx_init;
/* Names are lowercased versions of those found in SP800-108. */
unsigned char *ki;
size_t ki_len;
unsigned char *label;
size_t label_len;
unsigned char *context;
size_t context_len;
unsigned char *iv;
size_t iv_len;
} KBKDF;
/* Definitions needed for typechecking. */
static OSSL_OP_kdf_newctx_fn kbkdf_new;
static OSSL_OP_kdf_freectx_fn kbkdf_free;
static OSSL_OP_kdf_reset_fn kbkdf_reset;
static OSSL_OP_kdf_derive_fn kbkdf_derive;
static OSSL_OP_kdf_settable_ctx_params_fn kbkdf_settable_ctx_params;
static OSSL_OP_kdf_set_ctx_params_fn kbkdf_set_ctx_params;
/* Not all platforms have htobe32(). */
static uint32_t be32(uint32_t host)
{
uint32_t big = 0;
const union {
long one;
char little;
} is_endian = { 1 };
if (!is_endian.little)
return host;
big |= (host & 0xff000000) >> 24;
big |= (host & 0x00ff0000) >> 8;
big |= (host & 0x0000ff00) << 8;
big |= (host & 0x000000ff) << 24;
return big;
}
static void *kbkdf_new(void *provctx)
{
KBKDF *ctx;
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 kbkdf_free(void *vctx)
{
KBKDF *ctx = (KBKDF *)vctx;
if (ctx != NULL) {
kbkdf_reset(ctx);
OPENSSL_free(ctx);
}
}
static void kbkdf_reset(void *vctx)
{
KBKDF *ctx = (KBKDF *)vctx;
EVP_MAC_CTX_free(ctx->ctx_init);
OPENSSL_clear_free(ctx->context, ctx->context_len);
OPENSSL_clear_free(ctx->label, ctx->label_len);
OPENSSL_clear_free(ctx->ki, ctx->ki_len);
OPENSSL_clear_free(ctx->iv, ctx->iv_len);
memset(ctx, 0, sizeof(*ctx));
}
/* SP800-108 section 5.1 or section 5.2 depending on mode. */
static int derive(EVP_MAC_CTX *ctx_init, kbkdf_mode mode, unsigned char *iv,
size_t iv_len, unsigned char *label, size_t label_len,
unsigned char *context, size_t context_len,
unsigned char *k_i, size_t h, uint32_t l, unsigned char *ko,
size_t ko_len)
{
int ret = 0;
EVP_MAC_CTX *ctx = NULL;
size_t written = 0, to_write, k_i_len = iv_len;
const unsigned char zero = 0;
uint32_t counter, i;
/* Setup K(0) for feedback mode. */
if (iv_len > 0)
memcpy(k_i, iv, iv_len);
for (counter = 1; written < ko_len; counter++) {
i = be32(counter);
ctx = EVP_MAC_CTX_dup(ctx_init);
if (ctx == NULL)
goto done;
/* Perform feedback, if appropriate. */
if (mode == FEEDBACK && !EVP_MAC_update(ctx, k_i, k_i_len))
goto done;
if (!EVP_MAC_update(ctx, (unsigned char *)&i, 4)
|| !EVP_MAC_update(ctx, label, label_len)
|| !EVP_MAC_update(ctx, &zero, 1)
|| !EVP_MAC_update(ctx, context, context_len)
|| !EVP_MAC_update(ctx, (unsigned char *)&l, 4)
|| !EVP_MAC_final(ctx, k_i, NULL, h))
goto done;
to_write = ko_len - written;
memcpy(ko + written, k_i, MIN(to_write, h));
written += h;
k_i_len = h;
EVP_MAC_CTX_free(ctx);
ctx = NULL;
}
ret = 1;
done:
EVP_MAC_CTX_free(ctx);
return ret;
}
static int kbkdf_derive(void *vctx, unsigned char *key, size_t keylen)
{
KBKDF *ctx = (KBKDF *)vctx;
int ret = 0;
unsigned char *k_i = NULL;
uint32_t l = be32(keylen * 8);
size_t h = 0;
/* label, context, and iv are permitted to be empty. Check everything
* else. */
if (ctx->ctx_init == NULL) {
if (ctx->ki_len == 0 || ctx->ki == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
return 0;
}
/* Could either be missing MAC or missing message digest or missing
* cipher - arbitrarily, I pick this one. */
ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MAC);
return 0;
}
h = EVP_MAC_size(ctx->ctx_init);
if (h == 0)
goto done;
if (ctx->iv_len != 0 && ctx->iv_len != h) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SEED_LENGTH);
goto done;
}
k_i = OPENSSL_zalloc(h);
if (k_i == NULL)
goto done;
ret = derive(ctx->ctx_init, ctx->mode, ctx->iv, ctx->iv_len, ctx->label,
ctx->label_len, ctx->context, ctx->context_len, k_i, h, l,
key, keylen);
done:
if (ret != 1)
OPENSSL_cleanse(key, keylen);
OPENSSL_clear_free(k_i, h);
return ret;
}
static int kbkdf_set_buffer(unsigned char **out, size_t *out_len,
const OSSL_PARAM *p)
{
if (p->data == NULL || p->data_size == 0)
return 1;
OPENSSL_clear_free(*out, *out_len);
*out = NULL;
return OSSL_PARAM_get_octet_string(p, (void **)out, 0, out_len);
}
static int kbkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
KBKDF *ctx = (KBKDF *)vctx;
OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx);
const OSSL_PARAM *p;
OSSL_PARAM mparams[2];
if (!ossl_prov_macctx_load_from_params(&ctx->ctx_init, params, NULL,
NULL, NULL, libctx))
return 0;
else if (ctx->ctx_init != NULL
&& !EVP_MAC_is_a(EVP_MAC_CTX_mac(ctx->ctx_init),
OSSL_MAC_NAME_HMAC)
&& !EVP_MAC_is_a(EVP_MAC_CTX_mac(ctx->ctx_init),
OSSL_MAC_NAME_CMAC)) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MAC);
return 0;
}
p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_MODE);
if (p != NULL && strncasecmp("counter", p->data, p->data_size) == 0) {
ctx->mode = COUNTER;
} else if (p != NULL
&& strncasecmp("feedback", p->data, p->data_size) == 0) {
ctx->mode = FEEDBACK;
} else if (p != NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
return 0;
}
p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY);
if (p != NULL && !kbkdf_set_buffer(&ctx->ki, &ctx->ki_len, p))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT);
if (p != NULL && !kbkdf_set_buffer(&ctx->label, &ctx->label_len, p))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_INFO);
if (p != NULL && !kbkdf_set_buffer(&ctx->context, &ctx->context_len, p))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SEED);
if (p != NULL && !kbkdf_set_buffer(&ctx->iv, &ctx->iv_len, p))
return 0;
/* Set up digest context, if we can. */
if (ctx->ctx_init != NULL && ctx->ki_len != 0) {
mparams[0] = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY,
ctx->ki, ctx->ki_len);
mparams[1] = OSSL_PARAM_construct_end();
if (!EVP_MAC_CTX_set_params(ctx->ctx_init, mparams)
|| !EVP_MAC_init(ctx->ctx_init))
return 0;
}
return 1;
}
static const OSSL_PARAM *kbkdf_settable_ctx_params(void)
{
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_INFO, NULL, 0),
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, NULL, 0),
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SEED, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_CIPHER, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_MAC, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_MODE, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_END,
};
return known_settable_ctx_params;
}
static int kbkdf_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
OSSL_PARAM *p;
p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE);
if (p == NULL)
return -2;
/* KBKDF can produce results as large as you like. */
return OSSL_PARAM_set_size_t(p, SIZE_MAX);
}
static const OSSL_PARAM *kbkdf_gettable_ctx_params(void)
{
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 kdf_kbkdf_functions[] = {
{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kbkdf_new },
{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kbkdf_free },
{ OSSL_FUNC_KDF_RESET, (void(*)(void))kbkdf_reset },
{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kbkdf_derive },
{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
(void(*)(void))kbkdf_settable_ctx_params },
{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kbkdf_set_ctx_params },
{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
(void(*)(void))kbkdf_gettable_ctx_params },
{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kbkdf_get_ctx_params },
{ 0, NULL },
};
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