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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#include <inttypes.h>
#include <openssl/bn.h>
#include <openssl/conf.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/opensslv.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#include <isc/atomic.h>
#include <isc/log.h>
#include <isc/mutex.h>
#include <isc/mutexblock.h>
#include <isc/once.h>
#include <isc/thread.h>
#include <isc/util.h>
#include "openssl_shim.h"
#include "tls_p.h"
static isc_once_t init_once = ISC_ONCE_INIT;
static isc_once_t shut_once = ISC_ONCE_INIT;
static atomic_bool init_done = false;
static atomic_bool shut_done = false;
#if OPENSSL_VERSION_NUMBER < 0x10100000L
static isc_mutex_t *locks = NULL;
static int nlocks;
static void
isc__tls_lock_callback(int mode, int type, const char *file, int line) {
UNUSED(file);
UNUSED(line);
if ((mode & CRYPTO_LOCK) != 0) {
LOCK(&locks[type]);
} else {
UNLOCK(&locks[type]);
}
}
static void
isc__tls_set_thread_id(CRYPTO_THREADID *id) {
CRYPTO_THREADID_set_numeric(id, (unsigned long)isc_thread_self());
}
#endif
static void
tls_initialize(void) {
REQUIRE(!atomic_load(&init_done));
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
RUNTIME_CHECK(OPENSSL_init_ssl(OPENSSL_INIT_ENGINE_ALL_BUILTIN |
OPENSSL_INIT_LOAD_CONFIG,
NULL) == 1);
#else
nlocks = CRYPTO_num_locks();
/*
* We can't use isc_mem API here, because it's called too
* early and when the isc_mem_debugging flags are changed
* later and ISC_MEM_DEBUGSIZE or ISC_MEM_DEBUGCTX flags are
* added, neither isc_mem_put() nor isc_mem_free() can be used
* to free up the memory allocated here because the flags were
* not set when calling isc_mem_get() or isc_mem_allocate()
* here.
*
* Actually, since this is a single allocation at library load
* and deallocation at library unload, using the standard
* allocator without the tracking is fine for this purpose.
*/
locks = calloc(nlocks, sizeof(locks[0]));
isc_mutexblock_init(locks, nlocks);
CRYPTO_set_locking_callback(isc__tls_lock_callback);
CRYPTO_THREADID_set_callback(isc__tls_set_thread_id);
CRYPTO_malloc_init();
ERR_load_crypto_strings();
SSL_load_error_strings();
SSL_library_init();
#if !defined(OPENSSL_NO_ENGINE)
ENGINE_load_builtin_engines();
#endif
OpenSSL_add_all_algorithms();
OPENSSL_load_builtin_modules();
CONF_modules_load_file(NULL, NULL,
CONF_MFLAGS_DEFAULT_SECTION |
CONF_MFLAGS_IGNORE_MISSING_FILE);
#endif
/* Protect ourselves against unseeded PRNG */
if (RAND_status() != 1) {
FATAL_ERROR(__FILE__, __LINE__,
"OpenSSL pseudorandom number generator "
"cannot be initialized (see the `PRNG not "
"seeded' message in the OpenSSL FAQ)");
}
REQUIRE(atomic_compare_exchange_strong(&init_done, &(bool){ false },
true));
}
void
isc__tls_initialize(void) {
isc_result_t result = isc_once_do(&init_once, tls_initialize);
REQUIRE(result == ISC_R_SUCCESS);
REQUIRE(atomic_load(&init_done));
}
static void
tls_shutdown(void) {
REQUIRE(atomic_load(&init_done));
REQUIRE(!atomic_load(&shut_done));
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
OPENSSL_cleanup();
#else
CONF_modules_unload(1);
OBJ_cleanup();
EVP_cleanup();
#if !defined(OPENSSL_NO_ENGINE)
ENGINE_cleanup();
#endif
CRYPTO_cleanup_all_ex_data();
ERR_remove_thread_state(NULL);
RAND_cleanup();
ERR_free_strings();
CRYPTO_set_locking_callback(NULL);
if (locks != NULL) {
isc_mutexblock_destroy(locks, nlocks);
free(locks);
locks = NULL;
}
#endif
REQUIRE(atomic_compare_exchange_strong(&shut_done, &(bool){ false },
true));
}
void
isc__tls_shutdown(void) {
isc_result_t result = isc_once_do(&shut_once, tls_shutdown);
REQUIRE(result == ISC_R_SUCCESS);
REQUIRE(atomic_load(&shut_done));
}
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