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/*
* Copyright 2019-2021 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 <stddef.h>
#include <openssl/core.h>
#include "internal/cryptlib.h"
#include "internal/core.h"
#include "internal/property.h"
#include "internal/provider.h"
struct construct_data_st {
OSSL_LIB_CTX *libctx;
OSSL_METHOD_STORE *store;
int operation_id;
int force_store;
OSSL_METHOD_CONSTRUCT_METHOD *mcm;
void *mcm_data;
};
static int ossl_method_construct_precondition(OSSL_PROVIDER *provider,
int operation_id, void *cbdata,
int *result)
{
if (!ossl_assert(result != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (!ossl_provider_test_operation_bit(provider, operation_id, result))
return 0;
/*
* The result we get tells if methods have already been constructed.
* However, we want to tell whether construction should happen (true)
* or not (false), which is the opposite of what we got.
*/
*result = !*result;
return 1;
}
static int ossl_method_construct_postcondition(OSSL_PROVIDER *provider,
int operation_id, int no_store,
void *cbdata, int *result)
{
if (!ossl_assert(result != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
*result = 1;
return no_store != 0
|| ossl_provider_set_operation_bit(provider, operation_id);
}
static void ossl_method_construct_this(OSSL_PROVIDER *provider,
const OSSL_ALGORITHM *algo,
int no_store, void *cbdata)
{
struct construct_data_st *data = cbdata;
void *method = NULL;
if ((method = data->mcm->construct(algo, provider, data->mcm_data))
== NULL)
return;
/*
* Note regarding putting the method in stores:
*
* we don't need to care if it actually got in or not here.
* If it didn't get in, it will simply not be available when
* ossl_method_construct() tries to get it from the store.
*
* It is *expected* that the put function increments the refcnt
* of the passed method.
*/
if (data->force_store || !no_store) {
/*
* If we haven't been told not to store,
* add to the global store
*/
data->mcm->put(data->libctx, NULL, method, provider,
data->operation_id, algo->algorithm_names,
algo->property_definition, data->mcm_data);
}
data->mcm->put(data->libctx, data->store, method, provider,
data->operation_id, algo->algorithm_names,
algo->property_definition, data->mcm_data);
/* refcnt-- because we're dropping the reference */
data->mcm->destruct(method, data->mcm_data);
}
void *ossl_method_construct(OSSL_LIB_CTX *libctx, int operation_id,
int force_store,
OSSL_METHOD_CONSTRUCT_METHOD *mcm, void *mcm_data)
{
void *method = NULL;
if ((method = mcm->get(libctx, NULL, mcm_data)) == NULL) {
struct construct_data_st cbdata;
/*
* We have a temporary store to be able to easily search among new
* items, or items that should find themselves in the global store.
*/
if ((cbdata.store = mcm->alloc_tmp_store(libctx)) == NULL)
goto fin;
cbdata.libctx = libctx;
cbdata.operation_id = operation_id;
cbdata.force_store = force_store;
cbdata.mcm = mcm;
cbdata.mcm_data = mcm_data;
ossl_algorithm_do_all(libctx, operation_id, NULL,
ossl_method_construct_precondition,
ossl_method_construct_this,
ossl_method_construct_postcondition,
&cbdata);
method = mcm->get(libctx, cbdata.store, mcm_data);
if (method == NULL) {
/*
* If we get here then we did not construct the method that we
* attempted to construct. It's possible that another thread got
* there first and so we skipped construction (pre-condition
* failed). We check the global store again to see if it has
* appeared by now.
*/
method = mcm->get(libctx, NULL, mcm_data);
}
mcm->dealloc_tmp_store(cbdata.store);
}
fin:
return method;
}
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