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/*
* Copyright 2019 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/ossl_typ.h>
#include <openssl/evp.h>
#include <openssl/core.h>
#include "internal/cryptlib.h"
#include "internal/thread_once.h"
#include "internal/property.h"
#include "internal/core.h"
#include "internal/namemap.h"
#include "internal/evp_int.h" /* evp_locl.h needs it */
#include "evp_locl.h"
static void default_method_store_free(void *vstore)
{
ossl_method_store_free(vstore);
}
static void *default_method_store_new(OPENSSL_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static const OPENSSL_CTX_METHOD default_method_store_method = {
default_method_store_new,
default_method_store_free,
};
/* Data to be passed through ossl_method_construct() */
struct method_data_st {
OPENSSL_CTX *libctx;
const char *name;
OSSL_METHOD_CONSTRUCT_METHOD *mcm;
void *(*method_from_dispatch)(const OSSL_DISPATCH *, OSSL_PROVIDER *);
int (*refcnt_up_method)(void *method);
void (*destruct_method)(void *method);
};
/*
* Generic routines to fetch / create EVP methods with ossl_method_construct()
*/
static void *alloc_tmp_method_store(OPENSSL_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static void dealloc_tmp_method_store(void *store)
{
if (store != NULL)
ossl_method_store_free(store);
}
static OSSL_METHOD_STORE *get_default_method_store(OPENSSL_CTX *libctx)
{
return openssl_ctx_get_data(libctx, OPENSSL_CTX_DEFAULT_METHOD_STORE_INDEX,
&default_method_store_method);
}
/*
* To identity the method in the method store, we mix the name identity
* with the operation identity, with the assumption that we don't have
* more than 2^24 names or more than 2^8 operation types.
*
* The resulting identity is a 32-bit integer, composed like this:
*
* +---------24 bits--------+-8 bits-+
* | name identity | op id |
* +------------------------+--------+
*/
static uint32_t method_id(unsigned int operation_id, unsigned int name_id)
{
if (!ossl_assert(name_id < (1 << 24) || operation_id < (1 << 8))
|| !ossl_assert(name_id > 0 && operation_id > 0))
return 0;
return ((name_id << 8) & 0xFFFFFF00) | (operation_id & 0x000000FF);
}
static void *get_method_from_store(OPENSSL_CTX *libctx, void *store,
int operation_id, const char *name,
const char *propquery, void *data)
{
struct method_data_st *methdata = data;
void *method = NULL;
OSSL_NAMEMAP *namemap;
int nameid;
uint32_t methid;
if (store == NULL
&& (store = get_default_method_store(libctx)) == NULL)
return NULL;
if ((namemap = ossl_namemap_stored(libctx)) == NULL
|| (nameid = ossl_namemap_add(namemap, name)) == 0
|| (methid = method_id(operation_id, nameid)) == 0)
return NULL;
(void)ossl_method_store_fetch(store, methid, propquery, &method);
if (method != NULL
&& !methdata->refcnt_up_method(method)) {
method = NULL;
}
return method;
}
static int put_method_in_store(OPENSSL_CTX *libctx, void *store,
void *method, int operation_id,
const char *name, const char *propdef,
void *data)
{
struct method_data_st *methdata = data;
OSSL_NAMEMAP *namemap;
int nameid;
uint32_t methid;
if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL
|| (nameid = ossl_namemap_add(namemap, name)) == 0
|| (methid = method_id(operation_id, nameid)) == 0)
return 0;
if (store == NULL
&& (store = get_default_method_store(libctx)) == NULL)
return 0;
if (methdata->refcnt_up_method(method)
&& ossl_method_store_add(store, methid, propdef, method,
methdata->destruct_method))
return 1;
return 0;
}
static void *construct_method(const char *name, const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov, void *data)
{
struct method_data_st *methdata = data;
return methdata->method_from_dispatch(fns, prov);
}
static void destruct_method(void *method, void *data)
{
struct method_data_st *methdata = data;
methdata->destruct_method(method);
}
void *evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
const char *name, const char *properties,
void *(*new_method)(const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*upref_method)(void *),
void (*free_method)(void *))
{
OSSL_METHOD_STORE *store = get_default_method_store(libctx);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
int nameid = 0;
uint32_t methid = 0;
void *method = NULL;
if (store == NULL || namemap == NULL)
return NULL;
/*
* If there's ever an operation_id == 0 passed, we have an internal
* programming error.
*/
if (!ossl_assert(operation_id > 0))
return NULL;
/*
* method_id returns 0 if we have too many operations (more than
* about 2^8) or too many names (more than about 2^24). In that
* case, we can't create any new method.
*/
if ((nameid = ossl_namemap_number(namemap, name)) != 0
&& (methid = method_id(operation_id, nameid)) == 0)
return NULL;
if (nameid == 0
|| !ossl_method_store_cache_get(store, methid, properties,
&method)) {
OSSL_METHOD_CONSTRUCT_METHOD mcm = {
alloc_tmp_method_store,
dealloc_tmp_method_store,
get_method_from_store,
put_method_in_store,
construct_method,
destruct_method
};
struct method_data_st mcmdata;
mcmdata.mcm = &mcm;
mcmdata.libctx = libctx;
mcmdata.name = name;
mcmdata.method_from_dispatch = new_method;
mcmdata.destruct_method = free_method;
mcmdata.refcnt_up_method = upref_method;
mcmdata.destruct_method = free_method;
if ((method = ossl_method_construct(libctx, operation_id, name,
properties, 0 /* !force_cache */,
&mcm, &mcmdata)) == NULL) {
/*
* If construction did create a method for us, we know that
* there is a correct nameid and methodid, since those have
* already been calculated in get_method_from_store() and
* put_method_in_store() above.
*/
nameid = ossl_namemap_number(namemap, name);
methid = method_id(operation_id, nameid);
ossl_method_store_cache_set(store, methid, properties, method);
}
} else {
upref_method(method);
}
return method;
}
int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq)
{
OSSL_METHOD_STORE *store = get_default_method_store(libctx);
if (store != NULL)
return ossl_method_store_set_global_properties(store, propq);
EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR);
return 0;
}
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