/*

 * Copyright 2001-2022 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 "internal/e_os.h"

#include "eng_local.h"

#include <openssl/rand.h>

#include "internal/refcount.h"

CRYPTO_RWLOCK *global_engine_lock;

CRYPTO_ONCE engine_lock_init = CRYPTO_ONCE_STATIC_INIT;

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

DEFINE_RUN_ONCE(do_engine_lock_init)

{

    global_engine_lock = CRYPTO_THREAD_lock_new();

    return global_engine_lock != NULL;

}

ENGINE *ENGINE_new(void)

{

    ENGINE *ret;

    if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {

        /* Maybe this should be raised in do_engine_lock_init() */

        ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);

        return 0;

    }

    if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)

        return NULL;

    ret->struct_ref = 1;

    ENGINE_REF_PRINT(ret, 0, 1);

    ret->refcnt_lock = CRYPTO_THREAD_lock_new();

    if (ret->refcnt_lock == NULL) {

        OPENSSL_free(ret);

        return NULL;

    }

    if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ENGINE, ret, &ret->ex_data)) {

        CRYPTO_THREAD_lock_free(ret->refcnt_lock);

        OPENSSL_free(ret);

        return NULL;

    }

    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->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;

    e->dynamic_id = NULL;

}

int engine_free_util(ENGINE *e, int not_locked)

{

    int i;

    if (e == NULL)

        return 1;

    CRYPTO_DOWN_REF(&e->struct_ref, &i, e->refcnt_lock);

    ENGINE_REF_PRINT(e, 0, -1);

    if (i > 0)

        return 1;

    REF_ASSERT_ISNT(i < 0);

    /* 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);

    engine_remove_dynamic_id(e, not_locked);

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

    CRYPTO_THREAD_lock_free(e->refcnt_lock);

    OPENSSL_free(e);

    return 1;

}

int ENGINE_free(ENGINE *e)

{

    return engine_free_util(e, 1);

}

/* Cleanup stuff */

/*

 * engine_cleanup_int() 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;

    if ((item = OPENSSL_malloc(sizeof(*item))) == NULL)

        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 != NULL)

        if (sk_ENGINE_CLEANUP_ITEM_insert(cleanup_stack, item, 0) <= 0)

            OPENSSL_free(item);

}

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 != NULL) {

        if (sk_ENGINE_CLEANUP_ITEM_push(cleanup_stack, item) <= 0)

            OPENSSL_free(item);

    }

}

/* The API function that performs all cleanup */

static void engine_cleanup_cb_free(ENGINE_CLEANUP_ITEM *item)

{

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

    OPENSSL_free(item);

}

void engine_cleanup_int(void)

{

    if (int_cleanup_check(0)) {

        sk_ENGINE_CLEANUP_ITEM_pop_free(cleanup_stack,

                                        engine_cleanup_cb_free);

        cleanup_stack = NULL;

    }

    CRYPTO_THREAD_lock_free(global_engine_lock);

    global_engine_lock = NULL;

}

/* Now the "ex_data" support */

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) {

        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);

        return 0;

    }

    e->id = id;

    return 1;

}

int ENGINE_set_name(ENGINE *e, const char *name)

{

    if (name == NULL) {

        ERR_raise(ERR_LIB_ENGINE, 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;

}