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349 lines
10 KiB
C
349 lines
10 KiB
C
/*
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* Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "eng_local.h"
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/*
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* The linked-list of pointers to engine types. engine_list_head incorporates
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* an implicit structural reference but engine_list_tail does not - the
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* latter is a computational optimization and only points to something that
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* is already pointed to by its predecessor in the list (or engine_list_head
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* itself). In the same way, the use of the "prev" pointer in each ENGINE is
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* to save excessive list iteration, it doesn't correspond to an extra
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* structural reference. Hence, engine_list_head, and each non-null "next"
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* pointer account for the list itself assuming exactly 1 structural
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* reference on each list member.
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*/
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static ENGINE *engine_list_head = NULL;
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static ENGINE *engine_list_tail = NULL;
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/*
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* This cleanup function is only needed internally. If it should be called,
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* we register it with the "engine_cleanup_int()" stack to be called during
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* cleanup.
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*/
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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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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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/*
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* These static functions starting with a lower case "engine_" always take
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* place when global_engine_lock has been locked up.
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*/
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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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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD, 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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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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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD, 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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/* We are adding to an empty list. */
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if (engine_list_tail) {
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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD, 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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/*
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* The first time the list allocates, we should register the cleanup.
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*/
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engine_cleanup_add_last(engine_list_cleanup);
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} else {
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/* We are adding to the tail of an existing list. */
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if ((engine_list_tail == NULL) || (engine_list_tail->next != NULL)) {
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ENGINEerr(ENGINE_F_ENGINE_LIST_ADD, 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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/*
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* Having the engine in the list assumes a structural reference.
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*/
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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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ENGINEerr(ENGINE_F_ENGINE_LIST_REMOVE, 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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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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if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
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ENGINEerr(ENGINE_F_ENGINE_GET_FIRST, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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ret = engine_list_head;
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if (ret) {
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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_THREAD_unlock(global_engine_lock);
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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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if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
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ENGINEerr(ENGINE_F_ENGINE_GET_LAST, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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ret = engine_list_tail;
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if (ret) {
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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_THREAD_unlock(global_engine_lock);
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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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ENGINEerr(ENGINE_F_ENGINE_GET_NEXT, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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ret = e->next;
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if (ret) {
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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_THREAD_unlock(global_engine_lock);
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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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ENGINEerr(ENGINE_F_ENGINE_GET_PREV, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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ret = e->prev;
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if (ret) {
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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_THREAD_unlock(global_engine_lock);
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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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ENGINEerr(ENGINE_F_ENGINE_ADD, 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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ENGINEerr(ENGINE_F_ENGINE_ADD, ENGINE_R_ID_OR_NAME_MISSING);
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return 0;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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if (!engine_list_add(e)) {
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ENGINEerr(ENGINE_F_ENGINE_ADD, ENGINE_R_INTERNAL_LIST_ERROR);
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to_return = 0;
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}
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CRYPTO_THREAD_unlock(global_engine_lock);
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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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ENGINEerr(ENGINE_F_ENGINE_REMOVE, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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if (!engine_list_remove(e)) {
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ENGINEerr(ENGINE_F_ENGINE_REMOVE, ENGINE_R_INTERNAL_LIST_ERROR);
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to_return = 0;
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}
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CRYPTO_THREAD_unlock(global_engine_lock);
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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_EC
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dest->ec_meth = src->ec_meth;
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#endif
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dest->rand_meth = src->rand_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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ENGINEerr(ENGINE_F_ENGINE_BY_ID, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
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ENGINEerr(ENGINE_F_ENGINE_BY_ID, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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CRYPTO_THREAD_write_lock(global_engine_lock);
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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 != NULL) {
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/*
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* We need to return a structural reference. If this is an ENGINE
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* type that returns copies, make a duplicate - otherwise increment
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* the existing ENGINE's reference count.
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*/
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if (iterator->flags & ENGINE_FLAGS_BY_ID_COPY) {
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ENGINE *cp = ENGINE_new();
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if (cp == NULL)
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iterator = NULL;
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else {
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engine_cpy(cp, iterator);
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iterator = cp;
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}
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} else {
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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_THREAD_unlock(global_engine_lock);
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if (iterator != NULL)
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return iterator;
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/*
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* Prevent infinite recursion if we're looking for the dynamic engine.
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*/
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if (strcmp(id, "dynamic")) {
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if ((load_dir = ossl_safe_getenv("OPENSSL_ENGINES")) == NULL)
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load_dir = ENGINESDIR;
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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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}
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int ENGINE_up_ref(ENGINE *e)
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{
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int i;
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if (e == NULL) {
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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_UP_REF(&e->struct_ref, &i, global_engine_lock);
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return 1;
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}
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