yuzu/externals/libressl/crypto/engine/eng_list.c

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2020-12-28 19:15:37 +04:00
/* $OpenBSD: eng_list.c,v 1.24 2019/01/19 01:07:00 tb Exp $ */
/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
* project 2000.
*/
/* ====================================================================
* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* ECDH support in OpenSSL originally developed by
* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
*/
#include <string.h>
#include <unistd.h>
#include <openssl/opensslconf.h>
#include <openssl/err.h>
#include "cryptlib.h"
#include "eng_int.h"
/* The linked-list of pointers to engine types. engine_list_head
* incorporates an implicit structural reference but engine_list_tail
* does not - the latter is a computational niceity and only points
* to something that is already pointed to by its predecessor in the
* list (or engine_list_head itself). In the same way, the use of the
* "prev" pointer in each ENGINE is to save excessive list iteration,
* it doesn't correspond to an extra structural reference. Hence,
* engine_list_head, and each non-null "next" pointer account for
* the list itself assuming exactly 1 structural reference on each
* list member. */
static ENGINE *engine_list_head = NULL;
static ENGINE *engine_list_tail = NULL;
/* This cleanup function is only needed internally. If it should be called, we
* register it with the "ENGINE_cleanup()" stack to be called during cleanup. */
static void
engine_list_cleanup(void)
{
ENGINE *iterator = engine_list_head;
while (iterator != NULL && ENGINE_remove(iterator))
iterator = engine_list_head;
}
/* These static functions starting with a lower case "engine_" always
* take place when CRYPTO_LOCK_ENGINE has been locked up. */
static int
engine_list_add(ENGINE *e)
{
int conflict = 0;
ENGINE *iterator = NULL;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
iterator = engine_list_head;
while (iterator && !conflict) {
conflict = (strcmp(iterator->id, e->id) == 0);
iterator = iterator->next;
}
if (conflict) {
ENGINEerror(ENGINE_R_CONFLICTING_ENGINE_ID);
return 0;
}
if (engine_list_head == NULL) {
/* We are adding to an empty list. */
if (engine_list_tail) {
ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
return 0;
}
engine_list_head = e;
e->prev = NULL;
/* The first time the list allocates, we should register the
* cleanup. */
engine_cleanup_add_last(engine_list_cleanup);
} else {
/* We are adding to the tail of an existing list. */
if ((engine_list_tail == NULL) ||
(engine_list_tail->next != NULL)) {
ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
return 0;
}
engine_list_tail->next = e;
e->prev = engine_list_tail;
}
/* Having the engine in the list assumes a structural
* reference. */
e->struct_ref++;
engine_ref_debug(e, 0, 1)
/* However it came to be, e is the last item in the list. */
engine_list_tail = e;
e->next = NULL;
return 1;
}
static int
engine_list_remove(ENGINE *e)
{
ENGINE *iterator;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
/* We need to check that e is in our linked list! */
iterator = engine_list_head;
while (iterator && (iterator != e))
iterator = iterator->next;
if (iterator == NULL) {
ENGINEerror(ENGINE_R_ENGINE_IS_NOT_IN_LIST);
return 0;
}
/* un-link e from the chain. */
if (e->next)
e->next->prev = e->prev;
if (e->prev)
e->prev->next = e->next;
/* Correct our head/tail if necessary. */
if (engine_list_head == e)
engine_list_head = e->next;
if (engine_list_tail == e)
engine_list_tail = e->prev;
engine_free_util(e, 0);
return 1;
}
/* Get the first/last "ENGINE" type available. */
ENGINE *
ENGINE_get_first(void)
{
ENGINE *ret;
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = engine_list_head;
if (ret) {
ret->struct_ref++;
engine_ref_debug(ret, 0, 1)
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return ret;
}
ENGINE *
ENGINE_get_last(void)
{
ENGINE *ret;
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = engine_list_tail;
if (ret) {
ret->struct_ref++;
engine_ref_debug(ret, 0, 1)
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return ret;
}
/* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
ENGINE *
ENGINE_get_next(ENGINE *e)
{
ENGINE *ret = NULL;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = e->next;
if (ret) {
/* Return a valid structural refernce to the next ENGINE */
ret->struct_ref++;
engine_ref_debug(ret, 0, 1)
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
/* Release the structural reference to the previous ENGINE */
ENGINE_free(e);
return ret;
}
ENGINE *
ENGINE_get_prev(ENGINE *e)
{
ENGINE *ret = NULL;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = e->prev;
if (ret) {
/* Return a valid structural reference to the next ENGINE */
ret->struct_ref++;
engine_ref_debug(ret, 0, 1)
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
/* Release the structural reference to the previous ENGINE */
ENGINE_free(e);
return ret;
}
/* Add another "ENGINE" type into the list. */
int
ENGINE_add(ENGINE *e)
{
int to_return = 1;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if ((e->id == NULL) || (e->name == NULL)) {
ENGINEerror(ENGINE_R_ID_OR_NAME_MISSING);
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
if (!engine_list_add(e)) {
ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
to_return = 0;
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return to_return;
}
/* Remove an existing "ENGINE" type from the array. */
int
ENGINE_remove(ENGINE *e)
{
int to_return = 1;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
if (!engine_list_remove(e)) {
ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
to_return = 0;
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return to_return;
}
static void
engine_cpy(ENGINE *dest, const ENGINE *src)
{
dest->id = src->id;
dest->name = src->name;
#ifndef OPENSSL_NO_RSA
dest->rsa_meth = src->rsa_meth;
#endif
#ifndef OPENSSL_NO_DSA
dest->dsa_meth = src->dsa_meth;
#endif
#ifndef OPENSSL_NO_DH
dest->dh_meth = src->dh_meth;
#endif
#ifndef OPENSSL_NO_ECDH
dest->ecdh_meth = src->ecdh_meth;
#endif
#ifndef OPENSSL_NO_ECDSA
dest->ecdsa_meth = src->ecdsa_meth;
#endif
#ifndef OPENSSL_NO_EC
dest->ec_meth = src->ec_meth;
#endif
dest->rand_meth = src->rand_meth;
dest->store_meth = src->store_meth;
dest->ciphers = src->ciphers;
dest->digests = src->digests;
dest->pkey_meths = src->pkey_meths;
dest->destroy = src->destroy;
dest->init = src->init;
dest->finish = src->finish;
dest->ctrl = src->ctrl;
dest->load_privkey = src->load_privkey;
dest->load_pubkey = src->load_pubkey;
dest->cmd_defns = src->cmd_defns;
dest->flags = src->flags;
}
ENGINE *
ENGINE_by_id(const char *id)
{
ENGINE *iterator;
if (id == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
iterator = engine_list_head;
while (iterator && (strcmp(id, iterator->id) != 0))
iterator = iterator->next;
if (iterator) {
/* We need to return a structural reference. If this is an
* ENGINE type that returns copies, make a duplicate - otherwise
* increment the existing ENGINE's reference count. */
if (iterator->flags & ENGINE_FLAGS_BY_ID_COPY) {
ENGINE *cp = ENGINE_new();
if (!cp)
iterator = NULL;
else {
engine_cpy(cp, iterator);
iterator = cp;
}
} else {
iterator->struct_ref++;
engine_ref_debug(iterator, 0, 1)
}
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
if (iterator == NULL) {
ENGINEerror(ENGINE_R_NO_SUCH_ENGINE);
ERR_asprintf_error_data("id=%s", id);
}
return iterator;
}
int
ENGINE_up_ref(ENGINE *e)
{
int refs;
if (e == NULL) {
ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
refs = CRYPTO_add(&e->struct_ref, 1, CRYPTO_LOCK_ENGINE);
return refs > 1 ? 1 : 0;
}