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e933f91f50
Always add a dynamically loaded ENGINE to list. Otherwise it can cause problems when multiply loaded, especially if it adds new public key methods. For all current engines we only want a single implementation anyway.
435 lines
12 KiB
C
435 lines
12 KiB
C
/* crypto/engine/eng_list.c */
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/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
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* project 2000.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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* ECDH support in OpenSSL originally developed by
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* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
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*/
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#include "eng_int.h"
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/* The linked-list of pointers to engine types. engine_list_head
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* incorporates an implicit structural reference but engine_list_tail
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* does not - the latter is a computational niceity and only points
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* to something that is already pointed to by its predecessor in the
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* list (or engine_list_head itself). In the same way, the use of the
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* "prev" pointer in each ENGINE is to save excessive list iteration,
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* it doesn't correspond to an extra structural reference. Hence,
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* engine_list_head, and each non-null "next" pointer account for
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* the list itself assuming exactly 1 structural reference on each
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* list member. */
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static ENGINE *engine_list_head = NULL;
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static ENGINE *engine_list_tail = NULL;
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/* This cleanup function is only needed internally. If it should be called, we
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* register it with the "ENGINE_cleanup()" stack to be called during cleanup. */
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static void engine_list_cleanup(void)
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{
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ENGINE *iterator = engine_list_head;
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while(iterator != NULL)
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{
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ENGINE_remove(iterator);
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iterator = engine_list_head;
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}
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return;
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}
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/* These static functions starting with a lower case "engine_" always
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* take place when CRYPTO_LOCK_ENGINE has been locked up. */
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static int engine_list_add(ENGINE *e)
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{
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int conflict = 0;
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ENGINE *iterator = NULL;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
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ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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iterator = engine_list_head;
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while(iterator && !conflict)
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{
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conflict = (strcmp(iterator->id, e->id) == 0);
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iterator = iterator->next;
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}
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if(conflict)
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{
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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
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ENGINE_R_CONFLICTING_ENGINE_ID);
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return 0;
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}
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if(engine_list_head == NULL)
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{
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/* We are adding to an empty list. */
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if(engine_list_tail)
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{
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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
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ENGINE_R_INTERNAL_LIST_ERROR);
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return 0;
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}
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engine_list_head = e;
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e->prev = NULL;
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/* The first time the list allocates, we should register the
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* cleanup. */
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engine_cleanup_add_last(engine_list_cleanup);
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}
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else
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{
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/* We are adding to the tail of an existing list. */
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if((engine_list_tail == NULL) ||
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(engine_list_tail->next != NULL))
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{
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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD,
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ENGINE_R_INTERNAL_LIST_ERROR);
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return 0;
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}
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engine_list_tail->next = e;
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e->prev = engine_list_tail;
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}
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/* Having the engine in the list assumes a structural
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* reference. */
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e->struct_ref++;
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engine_ref_debug(e, 0, 1)
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/* However it came to be, e is the last item in the list. */
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engine_list_tail = e;
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e->next = NULL;
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return 1;
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}
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static int engine_list_remove(ENGINE *e)
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{
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ENGINE *iterator;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
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ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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/* We need to check that e is in our linked list! */
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iterator = engine_list_head;
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while(iterator && (iterator != e))
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iterator = iterator->next;
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if(iterator == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE,
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ENGINE_R_ENGINE_IS_NOT_IN_LIST);
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return 0;
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}
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/* un-link e from the chain. */
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if(e->next)
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e->next->prev = e->prev;
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if(e->prev)
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e->prev->next = e->next;
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/* Correct our head/tail if necessary. */
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if(engine_list_head == e)
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engine_list_head = e->next;
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if(engine_list_tail == e)
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engine_list_tail = e->prev;
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engine_free_util(e, 0);
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return 1;
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}
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/* Get the first/last "ENGINE" type available. */
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ENGINE *ENGINE_get_first(void)
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{
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ENGINE *ret;
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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ret = engine_list_head;
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if(ret)
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{
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ret->struct_ref++;
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engine_ref_debug(ret, 0, 1)
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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return ret;
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}
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ENGINE *ENGINE_get_last(void)
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{
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ENGINE *ret;
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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ret = engine_list_tail;
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if(ret)
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{
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ret->struct_ref++;
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engine_ref_debug(ret, 0, 1)
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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return ret;
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}
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/* Iterate to the next/previous "ENGINE" type (NULL = end of the list). */
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ENGINE *ENGINE_get_next(ENGINE *e)
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{
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ENGINE *ret = NULL;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_GET_NEXT,
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ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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ret = e->next;
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if(ret)
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{
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/* Return a valid structural refernce to the next ENGINE */
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ret->struct_ref++;
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engine_ref_debug(ret, 0, 1)
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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/* Release the structural reference to the previous ENGINE */
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ENGINE_free(e);
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return ret;
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}
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ENGINE *ENGINE_get_prev(ENGINE *e)
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{
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ENGINE *ret = NULL;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_GET_PREV,
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ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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ret = e->prev;
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if(ret)
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{
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/* Return a valid structural reference to the next ENGINE */
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ret->struct_ref++;
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engine_ref_debug(ret, 0, 1)
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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/* Release the structural reference to the previous ENGINE */
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ENGINE_free(e);
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return ret;
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}
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/* Add another "ENGINE" type into the list. */
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int ENGINE_add(ENGINE *e)
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{
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int to_return = 1;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_ADD,
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ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if((e->id == NULL) || (e->name == NULL))
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{
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ENGINEerr(ENGINE_F_ENGINE_ADD,
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ENGINE_R_ID_OR_NAME_MISSING);
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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if(!engine_list_add(e))
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{
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ENGINEerr(ENGINE_F_ENGINE_ADD,
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ENGINE_R_INTERNAL_LIST_ERROR);
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to_return = 0;
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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return to_return;
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}
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/* Remove an existing "ENGINE" type from the array. */
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int ENGINE_remove(ENGINE *e)
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{
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int to_return = 1;
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if(e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_REMOVE,
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ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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if(!engine_list_remove(e))
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{
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ENGINEerr(ENGINE_F_ENGINE_REMOVE,
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ENGINE_R_INTERNAL_LIST_ERROR);
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to_return = 0;
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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return to_return;
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}
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static void engine_cpy(ENGINE *dest, const ENGINE *src)
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{
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dest->id = src->id;
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dest->name = src->name;
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#ifndef OPENSSL_NO_RSA
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dest->rsa_meth = src->rsa_meth;
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#endif
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#ifndef OPENSSL_NO_DSA
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dest->dsa_meth = src->dsa_meth;
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#endif
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#ifndef OPENSSL_NO_DH
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dest->dh_meth = src->dh_meth;
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#endif
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#ifndef OPENSSL_NO_ECDH
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dest->ecdh_meth = src->ecdh_meth;
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#endif
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#ifndef OPENSSL_NO_ECDSA
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dest->ecdsa_meth = src->ecdsa_meth;
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#endif
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dest->rand_meth = src->rand_meth;
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dest->store_meth = src->store_meth;
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dest->ciphers = src->ciphers;
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dest->digests = src->digests;
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dest->pkey_meths = src->pkey_meths;
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dest->destroy = src->destroy;
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dest->init = src->init;
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dest->finish = src->finish;
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dest->ctrl = src->ctrl;
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dest->load_privkey = src->load_privkey;
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dest->load_pubkey = src->load_pubkey;
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dest->cmd_defns = src->cmd_defns;
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dest->flags = src->flags;
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}
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ENGINE *ENGINE_by_id(const char *id)
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{
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ENGINE *iterator;
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char *load_dir = NULL;
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if(id == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_BY_ID,
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ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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iterator = engine_list_head;
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while(iterator && (strcmp(id, iterator->id) != 0))
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iterator = iterator->next;
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if(iterator)
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{
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/* We need to return a structural reference. If this is an
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* ENGINE type that returns copies, make a duplicate - otherwise
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* increment the existing ENGINE's reference count. */
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if(iterator->flags & ENGINE_FLAGS_BY_ID_COPY)
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{
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ENGINE *cp = ENGINE_new();
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if(!cp)
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iterator = NULL;
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else
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{
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engine_cpy(cp, iterator);
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iterator = cp;
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}
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}
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else
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{
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iterator->struct_ref++;
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engine_ref_debug(iterator, 0, 1)
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}
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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#if 0
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if(iterator == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_BY_ID,
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ENGINE_R_NO_SUCH_ENGINE);
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ERR_add_error_data(2, "id=", id);
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}
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return iterator;
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#else
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/* EEK! Experimental code starts */
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if(iterator) return iterator;
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/* Prevent infinite recusrion if we're looking for the dynamic engine. */
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if (strcmp(id, "dynamic"))
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{
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#ifdef OPENSSL_SYS_VMS
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if((load_dir = getenv("OPENSSL_ENGINES")) == 0) load_dir = "SSLROOT:[ENGINES]";
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#else
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if((load_dir = getenv("OPENSSL_ENGINES")) == 0) load_dir = ENGINESDIR;
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#endif
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iterator = ENGINE_by_id("dynamic");
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if(!iterator || !ENGINE_ctrl_cmd_string(iterator, "ID", id, 0) ||
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!ENGINE_ctrl_cmd_string(iterator, "DIR_LOAD", "2", 0) ||
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!ENGINE_ctrl_cmd_string(iterator, "DIR_ADD",
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load_dir, 0) ||
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!ENGINE_ctrl_cmd_string(iterator, "LIST_ADD", "1", 0) ||
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!ENGINE_ctrl_cmd_string(iterator, "LOAD", NULL, 0))
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goto notfound;
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return iterator;
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}
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notfound:
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ENGINE_free(iterator);
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ENGINEerr(ENGINE_F_ENGINE_BY_ID,ENGINE_R_NO_SUCH_ENGINE);
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ERR_add_error_data(2, "id=", id);
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return NULL;
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/* EEK! Experimental code ends */
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#endif
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}
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int ENGINE_up_ref(ENGINE *e)
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{
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if (e == NULL)
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{
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ENGINEerr(ENGINE_F_ENGINE_UP_REF,ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_add(&e->struct_ref,1,CRYPTO_LOCK_ENGINE);
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return 1;
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}
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