/* $OpenBSD: eng_lib.c,v 1.14 2018/04/14 07:18:37 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).

 *

 */

#include <string.h>

#include <openssl/err.h>

#include <openssl/rand.h>

#include "eng_int.h"

/* The "new"/"free" stuff first */

ENGINE *

ENGINE_new(void)

{

  ENGINE *ret;

  if (!OPENSSL_init_crypto(0, NULL))

    return NULL;

  ret = malloc(sizeof(ENGINE));

  if (ret == NULL) {

    ENGINEerror(ERR_R_MALLOC_FAILURE);

    return NULL;

  }

  memset(ret, 0, sizeof(ENGINE));

  ret->struct_ref = 1;

  engine_ref_debug(ret, 0, 1)

  CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ENGINE, ret, &ret->ex_data);

  return ret;

}

/* Placed here (close proximity to ENGINE_new) so that modifications to the

 * elements of the ENGINE structure are more likely to be caught and changed

 * here. */

void

engine_set_all_null(ENGINE *e)

{

  e->id = NULL;

  e->name = NULL;

  e->rsa_meth = NULL;

  e->dsa_meth = NULL;

  e->dh_meth = NULL;

  e->rand_meth = NULL;

  e->store_meth = NULL;

  e->ciphers = NULL;

  e->digests = NULL;

  e->destroy = NULL;

  e->init = NULL;

  e->finish = NULL;

  e->ctrl = NULL;

  e->load_privkey = NULL;

  e->load_pubkey = NULL;

  e->cmd_defns = NULL;

  e->flags = 0;

}

int

engine_free_util(ENGINE *e, int locked)

{

  int i;

  if (e == NULL)

    return 1;

  if (locked)

    i = CRYPTO_add(&e->struct_ref, -1, CRYPTO_LOCK_ENGINE);

  else

    i = --e->struct_ref;

  engine_ref_debug(e, 0, -1)

  if (i > 0)

    return 1;

  /* Free up any dynamically allocated public key methods */

  engine_pkey_meths_free(e);

  engine_pkey_asn1_meths_free(e);

  /* Give the ENGINE a chance to do any structural cleanup corresponding

   * to allocation it did in its constructor (eg. unload error strings) */

  if (e->destroy)

    e->destroy(e);

  CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ENGINE, e, &e->ex_data);

  free(e);

  return 1;

}

int

ENGINE_free(ENGINE *e)

{

  return engine_free_util(e, 1);

}

/* Cleanup stuff */

/* ENGINE_cleanup() is coded such that anything that does work that will need

 * cleanup can register a "cleanup" callback here. That way we don't get linker

 * bloat by referring to all *possible* cleanups, but any linker bloat into code

 * "X" will cause X's cleanup function to end up here. */

static STACK_OF(ENGINE_CLEANUP_ITEM) *cleanup_stack = NULL;

static int

int_cleanup_check(int create)

{

  if (cleanup_stack)

    return 1;

  if (!create)

    return 0;

  cleanup_stack = sk_ENGINE_CLEANUP_ITEM_new_null();

  return (cleanup_stack ? 1 : 0);

}

static ENGINE_CLEANUP_ITEM *

int_cleanup_item(ENGINE_CLEANUP_CB *cb)

{

  ENGINE_CLEANUP_ITEM *item = malloc(sizeof(ENGINE_CLEANUP_ITEM));

  if (!item)

    return NULL;

  item->cb = cb;

  return item;

}

void

engine_cleanup_add_first(ENGINE_CLEANUP_CB *cb)

{

  ENGINE_CLEANUP_ITEM *item;

  if (!int_cleanup_check(1))

    return;

  item = int_cleanup_item(cb);

  if (item)

    sk_ENGINE_CLEANUP_ITEM_insert(cleanup_stack, item, 0);

}

void

engine_cleanup_add_last(ENGINE_CLEANUP_CB *cb)

{

  ENGINE_CLEANUP_ITEM *item;

  if (!int_cleanup_check(1))

    return;

  item = int_cleanup_item(cb);

  if (item)

    sk_ENGINE_CLEANUP_ITEM_push(cleanup_stack, item);

}

/* The API function that performs all cleanup */

static void

engine_cleanup_cb_free(ENGINE_CLEANUP_ITEM *item)

{

  (*(item->cb))();

  free(item);

}

void

ENGINE_cleanup(void)

{

  if (int_cleanup_check(0)) {

    sk_ENGINE_CLEANUP_ITEM_pop_free(cleanup_stack,

        engine_cleanup_cb_free);

    cleanup_stack = NULL;

  }

  /* FIXME: This should be handled (somehow) through RAND, eg. by it

   * registering a cleanup callback. */

  RAND_set_rand_method(NULL);

}

/* Now the "ex_data" support */

int

ENGINE_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

    CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

{

  return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ENGINE, argl, argp,

      new_func, dup_func, free_func);

}

int

ENGINE_set_ex_data(ENGINE *e, int idx, void *arg)

{

  return (CRYPTO_set_ex_data(&e->ex_data, idx, arg));

}

void *

ENGINE_get_ex_data(const ENGINE *e, int idx)

{

  return (CRYPTO_get_ex_data(&e->ex_data, idx));

}

/* Functions to get/set an ENGINE's elements - mainly to avoid exposing the

 * ENGINE structure itself. */

int

ENGINE_set_id(ENGINE *e, const char *id)

{

  if (id == NULL) {

    ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);

    return 0;

  }

  e->id = id;

  return 1;

}

int

ENGINE_set_name(ENGINE *e, const char *name)

{

  if (name == NULL) {

    ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);

    return 0;

  }

  e->name = name;

  return 1;

}

int

ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f)

{

  e->destroy = destroy_f;

  return 1;

}

int

ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f)

{

  e->init = init_f;

  return 1;

}

int

ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f)

{

  e->finish = finish_f;

  return 1;

}

int

ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f)

{

  e->ctrl = ctrl_f;

  return 1;

}

int

ENGINE_set_flags(ENGINE *e, int flags)

{

  e->flags = flags;

  return 1;

}

int

ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns)

{

  e->cmd_defns = defns;

  return 1;

}

const char *

ENGINE_get_id(const ENGINE *e)

{

  return e->id;

}

const char *

ENGINE_get_name(const ENGINE *e)

{

  return e->name;

}

ENGINE_GEN_INT_FUNC_PTR

ENGINE_get_destroy_function(const ENGINE *e)

{

  return e->destroy;

}

ENGINE_GEN_INT_FUNC_PTR

ENGINE_get_init_function(const ENGINE *e)

{

  return e->init;

}

ENGINE_GEN_INT_FUNC_PTR

ENGINE_get_finish_function(const ENGINE *e)

{

  return e->finish;

}

ENGINE_CTRL_FUNC_PTR

ENGINE_get_ctrl_function(const ENGINE *e)

{

  return e->ctrl;

}

int

ENGINE_get_flags(const ENGINE *e)

{

  return e->flags;

}

const ENGINE_CMD_DEFN *

ENGINE_get_cmd_defns(const ENGINE *e)

{

  return e->cmd_defns;

}

/* eng_lib.o is pretty much linked into anything that touches ENGINE already, so

 * put the "static_state" hack here. */

static int internal_static_hack = 0;

void *

ENGINE_get_static_state(void)

{

  return &internal_static_hack;

}