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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/types.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/provider.h"
#include "internal/namemap.h"
#include "crypto/evp.h" /* evp_local.h needs it */
#include "evp_local.h"
#define NAME_SEPARATOR ':'
static void evp_method_store_free(void *vstore)
{
ossl_method_store_free(vstore);
}
static void *evp_method_store_new(OPENSSL_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static const OPENSSL_CTX_METHOD evp_method_store_method = {
evp_method_store_new,
evp_method_store_free,
};
/* Data to be passed through ossl_method_construct() */
struct evp_method_data_st {
OPENSSL_CTX *libctx;
OSSL_METHOD_CONSTRUCT_METHOD *mcm;
int operation_id; /* For get_evp_method_from_store() */
int name_id; /* For get_evp_method_from_store() */
const char *names; /* For get_evp_method_from_store() */
const char *propquery; /* For get_evp_method_from_store() */
void *(*method_from_dispatch)(int name_id, 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_evp_method_store(OPENSSL_CTX *ctx)
{
return ossl_method_store_new(ctx);
}
static void dealloc_tmp_evp_method_store(void *store)
{
if (store != NULL)
ossl_method_store_free(store);
}
static OSSL_METHOD_STORE *get_evp_method_store(OPENSSL_CTX *libctx)
{
return openssl_ctx_get_data(libctx, OPENSSL_CTX_EVP_METHOD_STORE_INDEX,
&evp_method_store_method);
}
/*
* To identity the method in the EVP 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 evp_method_id(unsigned int operation_id, 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_evp_method_from_store(OPENSSL_CTX *libctx, void *store,
void *data)
{
struct evp_method_data_st *methdata = data;
void *method = NULL;
int name_id;
uint32_t meth_id;
/*
* get_evp_method_from_store() is only called to try and get the method
* that evp_generic_fetch() is asking for, and the operation id as well
* as the name or name id are passed via methdata.
*/
if ((name_id = methdata->name_id) == 0) {
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
const char *names = methdata->names;
const char *q = strchr(names, NAME_SEPARATOR);
size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));
if (namemap == 0)
return NULL;
name_id = ossl_namemap_name2num_n(namemap, names, l);
}
if (name_id == 0
|| (meth_id = evp_method_id(methdata->operation_id, name_id)) == 0)
return NULL;
if (store == NULL
&& (store = get_evp_method_store(libctx)) == NULL)
return NULL;
if (!ossl_method_store_fetch(store, meth_id, methdata->propquery,
&method))
return NULL;
return method;
}
static int put_evp_method_in_store(OPENSSL_CTX *libctx, void *store,
void *method, const OSSL_PROVIDER *prov,
int operation_id, const char *names,
const char *propdef, void *data)
{
struct evp_method_data_st *methdata = data;
OSSL_NAMEMAP *namemap;
int name_id;
uint32_t meth_id;
size_t l = 0;
/*
* put_evp_method_in_store() is only called with an EVP method that was
* successfully created by construct_method() below, which means that
* all the names should already be stored in the namemap with the same
* numeric identity, so just use the first to get that identity.
*/
if (names != NULL) {
const char *q = strchr(names, NAME_SEPARATOR);
l = (q == NULL ? strlen(names) : (size_t)(q - names));
}
if ((namemap = ossl_namemap_stored(libctx)) == NULL
|| (name_id = ossl_namemap_name2num_n(namemap, names, l)) == 0
|| (meth_id = evp_method_id(operation_id, name_id)) == 0)
return 0;
if (store == NULL
&& (store = get_evp_method_store(libctx)) == NULL)
return 0;
return ossl_method_store_add(store, prov, meth_id, propdef, method,
methdata->refcnt_up_method,
methdata->destruct_method);
}
/*
* The core fetching functionality passes the name of the implementation.
* This function is responsible to getting an identity number for it.
*/
static void *construct_evp_method(const OSSL_ALGORITHM *algodef,
OSSL_PROVIDER *prov, void *data)
{
/*
* This function is only called if get_evp_method_from_store() returned
* NULL, so it's safe to say that of all the spots to create a new
* namemap entry, this is it. Should the name already exist there, we
* know that ossl_namemap_add_name() will return its corresponding
* number.
*/
struct evp_method_data_st *methdata = data;
OPENSSL_CTX *libctx = ossl_provider_library_context(prov);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
const char *names = algodef->algorithm_names;
int name_id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);
if (name_id == 0)
return NULL;
return methdata->method_from_dispatch(name_id, algodef->implementation,
prov);
}
static void destruct_evp_method(void *method, void *data)
{
struct evp_method_data_st *methdata = data;
methdata->destruct_method(method);
}
static void *
inner_evp_generic_fetch(OPENSSL_CTX *libctx, int operation_id,
int name_id, const char *name,
const char *properties,
void *(*new_method)(int name_id,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov),
int (*up_ref_method)(void *),
void (*free_method)(void *))
{
OSSL_METHOD_STORE *store = get_evp_method_store(libctx);
OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);
uint32_t meth_id = 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;
/*
* If we have been passed neither a name_id or a name, we have an
* internal programming error.
*/
if (!ossl_assert(name_id != 0 || name != NULL))
return NULL;
/* If we haven't received a name id yet, try to get one for the name */
if (name_id == 0)
name_id = ossl_namemap_name2num(namemap, name);
/*
* If we have a name id, calculate a method id with evp_method_id().
*
* evp_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 (name_id != 0 && (meth_id = evp_method_id(operation_id, name_id)) == 0)
return
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