crypto/init.c

   1 /*
   2  * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/cryptlib_int.h"
  11 #include <openssl/err.h>
  12 #include "internal/rand_int.h"
  13 #include "internal/bio.h"
  14 #include <openssl/evp.h>
  15 #include "internal/evp_int.h"
  16 #include "internal/conf.h"
  17 #include "internal/async.h"
  18 #include "internal/engine.h"
  19 #include "internal/comp.h"
  20 #include "internal/err.h"
  21 #include "internal/err_int.h"
  22 #include "internal/objects.h"
  23 #include <stdlib.h>
  24 #include <assert.h>
  25 #include "internal/thread_once.h"
  26 #include "internal/dso.h"
  27 #include "internal/store.h"
  28
  29 static int stopped = 0;
  30
  31 static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
  32
  33 static CRYPTO_THREAD_LOCAL threadstopkey;
  34
  35 static void ossl_init_thread_stop_wrap(void *local)
  36 {
  37     ossl_init_thread_stop((struct thread_local_inits_st *)local);
  38 }
  39
  40 static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
  41 {
  42     struct thread_local_inits_st *local =
  43         CRYPTO_THREAD_get_local(&threadstopkey);
  44
  45     if (local == NULL && alloc) {
  46         local = OPENSSL_zalloc(sizeof *local);
  47         if (local != NULL && !CRYPTO_THREAD_set_local(&threadstopkey, local)) {
  48             OPENSSL_free(local);
  49             return NULL;
  50         }
  51     }
  52     if (!alloc) {
  53         CRYPTO_THREAD_set_local(&threadstopkey, NULL);
  54     }
  55
  56     return local;
  57 }
  58
  59 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  60 struct ossl_init_stop_st {
  61     void (*handler)(void);
  62     OPENSSL_INIT_STOP *next;
  63 };
  64
  65 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  66 static CRYPTO_RWLOCK *init_lock = NULL;
  67
  68 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  69 static int base_inited = 0;
  70 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  71 {
  72 #ifdef OPENSSL_INIT_DEBUG
  73     fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
  74 #endif
  75 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  76     ossl_malloc_setup_failures();
  77 #endif
  78     /*
  79      * We use a dummy thread local key here. We use the destructor to detect
  80      * when the thread is going to stop (where that feature is available)
  81      */
  82     CRYPTO_THREAD_init_local(&threadstopkey, ossl_init_thread_stop_wrap);
  83 #ifndef OPENSSL_SYS_UEFI
  84     atexit(OPENSSL_cleanup);
  85 #endif
  86     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  87         return 0;
  88     OPENSSL_cpuid_setup();
  89
  90     /*
  91      * BIG FAT WARNING!
  92      * Everything needed to be initialized in this function before threads
  93      * come along MUST happen before base_inited is set to 1, or we will
  94      * see race conditions.
  95      */
  96     base_inited = 1;
  97
  98 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
  99 # ifdef DSO_WIN32
 100     {
 101         HMODULE handle = NULL;
 102         BOOL ret;
 103
 104         /* We don't use the DSO route for WIN32 because there is a better way */
 105         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 106                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 107                                 (void *)&base_inited, &handle);
 108
 109         return (ret == TRUE) ? 1 : 0;
 110     }
 111 # else
 112     /*
 113      * Deliberately leak a reference to ourselves. This will force the library
 114      * to remain loaded until the atexit() handler is run at process exit.
 115      */
 116     {
 117         DSO *dso = NULL;
 118
 119         ERR_set_mark();
 120         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 121         DSO_free(dso);
 122         ERR_pop_to_mark();
 123     }
 124 # endif
 125 #endif
 126
 127     return 1;
 128 }
 129
 130 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 131 static int load_crypto_strings_inited = 0;
 132 DEFINE_RUN_ONCE_STATIC(ossl_init_no_load_crypto_strings)
 133 {
 134     /* Do nothing in this case */
 135     return 1;
 136 }
 137
 138 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 139 {
 140     int ret = 1;
 141     /*
 142      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 143      * pulling in all the error strings during static linking
 144      */
 145 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 146 # ifdef OPENSSL_INIT_DEBUG
 147     fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
 148                     "err_load_crypto_strings_int()\n");
 149 # endif
 150     ret = err_load_crypto_strings_int();
 151     load_crypto_strings_inited = 1;
 152 #endif
 153     return ret;
 154 }
 155
 156 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 157 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 158 {
 159     /*
 160      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 161      * pulling in all the ciphers during static linking
 162      */
 163 #ifndef OPENSSL_NO_AUTOALGINIT
 164 # ifdef OPENSSL_INIT_DEBUG
 165     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
 166                     "openssl_add_all_ciphers_int()\n");
 167 # endif
 168     openssl_add_all_ciphers_int();
 169 #endif
 170     return 1;
 171 }
 172
 173 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 174 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 175 {
 176     /*
 177      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 178      * pulling in all the ciphers during static linking
 179      */
 180 #ifndef OPENSSL_NO_AUTOALGINIT
 181 # ifdef OPENSSL_INIT_DEBUG
 182     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
 183                     "openssl_add_all_digests()\n");
 184 # endif
 185     openssl_add_all_digests_int();
 186 #endif
 187     return 1;
 188 }
 189
 190 DEFINE_RUN_ONCE_STATIC(ossl_init_no_add_algs)
 191 {
 192     /* Do nothing */
 193     return 1;
 194 }
 195
 196 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 197 static int config_inited = 0;
 198 static const char *appname;
 199 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 200 {
 201 #ifdef OPENSSL_INIT_DEBUG
 202     fprintf(stderr,
 203             "OPENSSL_INIT: ossl_init_config: openssl_config(%s)\n",
 204             appname == NULL ? "NULL" : appname);
 205 #endif
 206     openssl_config_int(appname);
 207     config_inited = 1;
 208     return 1;
 209 }
 210 DEFINE_RUN_ONCE_STATIC(ossl_init_no_config)
 211 {
 212 #ifdef OPENSSL_INIT_DEBUG
 213     fprintf(stderr,
 214             "OPENSSL_INIT: ossl_init_config: openssl_no_config_int()\n");
 215 #endif
 216     openssl_no_config_int();
 217     config_inited = 1;
 218     return 1;
 219 }
 220
 221 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 222 static int async_inited = 0;
 223 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 224 {
 225 #ifdef OPENSSL_INIT_DEBUG
 226     fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
 227 #endif
 228     if (!async_init())
 229         return 0;
 230     async_inited = 1;
 231     return 1;
 232 }
 233
 234 #ifndef OPENSSL_NO_ENGINE
 235 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 236 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 237 {
 238 # ifdef OPENSSL_INIT_DEBUG
 239     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
 240                     "engine_load_openssl_int()\n");
 241 # endif
 242     engine_load_openssl_int();
 243     return 1;
 244 }
 245 # ifndef OPENSSL_NO_DEVCRYPTOENG
 246 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 247 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 248 {
 249 #  ifdef OPENSSL_INIT_DEBUG
 250     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_devcrypto: "
 251                     "engine_load_devcrypto_int()\n");
 252 #  endif
 253     engine_load_devcrypto_int();
 254     return 1;
 255 }
 256 # endif
 257
 258 # ifndef OPENSSL_NO_RDRAND
 259 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 260 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 261 {
 262 #  ifdef OPENSSL_INIT_DEBUG
 263     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
 264                     "engine_load_rdrand_int()\n");
 265 #  endif
 266     engine_load_rdrand_int();
 267     return 1;
 268 }
 269 # endif
 270 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 271 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 272 {
 273 # ifdef OPENSSL_INIT_DEBUG
 274     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
 275                     "engine_load_dynamic_int()\n");
 276 # endif
 277     engine_load_dynamic_int();
 278     return 1;
 279 }
 280 # ifndef OPENSSL_NO_STATIC_ENGINE
 281 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 282 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 283 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 284 {
 285 #   ifdef OPENSSL_INIT_DEBUG
 286     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
 287                     "engine_load_padlock_int()\n");
 288 #   endif
 289     engine_load_padlock_int();
 290     return 1;
 291 }
 292 #  endif
 293 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 294 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 295 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 296 {
 297 #   ifdef OPENSSL_INIT_DEBUG
 298     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
 299                     "engine_load_capi_int()\n");
 300 #   endif
 301     engine_load_capi_int();
 302     return 1;
 303 }
 304 #  endif
 305 #  if !defined(OPENSSL_NO_AFALGENG)
 306 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 307 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 308 {
 309 #   ifdef OPENSSL_INIT_DEBUG
 310     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "
 311                     "engine_load_afalg_int()\n");
 312 #   endif
 313     engine_load_afalg_int();
 314     return 1;
 315 }
 316 #  endif
 317 # endif
 318 #endif
 319
 320 #ifndef OPENSSL_NO_COMP
 321 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 322
 323 static int zlib_inited = 0;
 324 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 325 {
 326     /* Do nothing - we need to know about this for the later cleanup */
 327     zlib_inited = 1;
 328     return 1;
 329 }
 330 #endif
 331
 332 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
 333 {
 334     /* Can't do much about this */
 335     if (locals == NULL)
 336         return;
 337
 338     if (locals->async) {
 339 #ifdef OPENSSL_INIT_DEBUG
 340         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 341                         "ASYNC_cleanup_thread()\n");
 342 #endif
 343         ASYNC_cleanup_thread();
 344     }
 345
 346     if (locals->err_state) {
 347 #ifdef OPENSSL_INIT_DEBUG
 348         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 349                         "err_delete_thread_state()\n");
 350 #endif
 351         err_delete_thread_state();
 352     }
 353
 354     OPENSSL_free(locals);
 355 }
 356
 357 void OPENSSL_thread_stop(void)
 358 {
 359     ossl_init_thread_stop(
 360         (struct thread_local_inits_st *)ossl_init_get_thread_local(0));
 361 }
 362
 363 int ossl_init_thread_start(uint64_t opts)
 364 {
 365     struct thread_local_inits_st *locals;
 366
 367     if (!OPENSSL_init_crypto(0, NULL))
 368         return 0;
 369
 370     locals = ossl_init_get_thread_local(1);
 371
 372     if (locals == NULL)
 373         return 0;
 374
 375     if (opts & OPENSSL_INIT_THREAD_ASYNC) {
 376 #ifdef OPENSSL_INIT_DEBUG
 377         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
 378                         "marking thread for async\n");
 379 #endif
 380         locals->async = 1;
 381     }
 382
 383     if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
 384 #ifdef OPENSSL_INIT_DEBUG
 385         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
 386                         "marking thread for err_state\n");
 387 #endif
 388         locals->err_state = 1;
 389     }
 390
 391     return 1;
 392 }
 393
 394 void OPENSSL_cleanup(void)
 395 {
 396     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 397
 398     /* If we've not been inited then no need to deinit */
 399     if (!base_inited)
 400         return;
 401
 402     /* Might be explicitly called and also by atexit */
 403     if (stopped)
 404         return;
 405     stopped = 1;
 406
 407     /*
 408      * Thread stop may not get automatically called by the thread library for
 409      * the very last thread in some situations, so call it directly.
 410      */
 411     ossl_init_thread_stop(ossl_init_get_thread_local(0));
 412
 413     currhandler = stop_handlers;
 414     while (currhandler != NULL) {
 415         currhandler->handler();
 416         lasthandler = currhandler;
 417         currhandler = currhandler->next;
 418         OPENSSL_free(lasthandler);
 419     }
 420     stop_handlers = NULL;
 421
 422     CRYPTO_THREAD_lock_free(init_lock);
 423
 424     /*
 425      * We assume we are single-threaded for this function, i.e. no race
 426      * conditions for the various "*_inited" vars below.
 427      */
 428
 429 #ifndef OPENSSL_NO_COMP
 430     if (zlib_inited) {
 431 #ifdef OPENSSL_INIT_DEBUG
 432         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 433                         "comp_zlib_cleanup_int()\n");
 434 #endif
 435         comp_zlib_cleanup_int();
 436     }
 437 #endif
 438
 439     if (async_inited) {
 440 # ifdef OPENSSL_INIT_DEBUG
 441         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 442                         "async_deinit()\n");
 443 # endif
 444         async_deinit();
 445     }
 446
 447     if (load_crypto_strings_inited) {
 448 #ifdef OPENSSL_INIT_DEBUG
 449         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 450                         "err_free_strings_int()\n");
 451 #endif
 452         err_free_strings_int();
 453     }
 454
 455     CRYPTO_THREAD_cleanup_local(&threadstopkey);
 456
 457 #ifdef OPENSSL_INIT_DEBUG
 458     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 459                     "rand_cleanup_int()\n");
 460     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 461                     "conf_modules_free_int()\n");
 462 #ifndef OPENSSL_NO_ENGINE
 463     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 464                     "engine_cleanup_int()\n");
 465 #endif
 466     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 467                     "crypto_cleanup_all_ex_data_int()\n");
 468     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 469                     "bio_sock_cleanup_int()\n");
 470     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 471                     "bio_cleanup()\n");
 472     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 473                     "evp_cleanup_int()\n");
 474     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 475                     "obj_cleanup_int()\n");
 476     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 477                     "err_cleanup()\n");
 478 #endif
 479     /*
 480      * Note that cleanup order is important:
 481      * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
 482      * must be called before engine_cleanup_int()
 483      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 484      * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
 485      * - conf_modules_free_int() can end up in ENGINE code so must be called
 486      * before engine_cleanup_int()
 487      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 488      * obj_cleanup_int() must be called last
 489      */
 490     rand_cleanup_int();
 491     conf_modules_free_int();
 492 #ifndef OPENSSL_NO_ENGINE
 493     engine_cleanup_int();
 494 #endif
 495     ossl_store_cleanup_int();
 496     crypto_cleanup_all_ex_data_int();
 497     bio_cleanup();
 498     evp_cleanup_int();
 499     obj_cleanup_int();
 500     err_cleanup();
 501
 502     base_inited = 0;
 503 }
 504
 505 /*
 506  * If this function is called with a non NULL settings value then it must be
 507  * called prior to any threads making calls to any OpenSSL functions,
 508  * i.e. passing a non-null settings value is assumed to be single-threaded.
 509  */
 510 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 511 {
 512     static int stoperrset = 0;
 513
 514     if (stopped) {
 515         if (!stoperrset) {
 516             /*
 517              * We only ever set this once to avoid getting into an infinite
 518              * loop where the error system keeps trying to init and fails so
 519              * sets an error etc
 520              */
 521             stoperrset = 1;
 522             CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
 523         }
 524         return 0;
 525     }
 526
 527     if (!base_inited && !RUN_ONCE(&base, ossl_init_base))
 528         return 0;
 529
 530     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 531             && !RUN_ONCE(&load_crypto_strings,
 532                          ossl_init_no_load_crypto_strings))
 533         return 0;
 534
 535     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 536             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 537         return 0;
 538
 539     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 540             && !RUN_ONCE(&add_all_ciphers, ossl_init_no_add_algs))
 541         return 0;
 542
 543     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 544             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 545         return 0;
 546
 547     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 548             && !RUN_ONCE(&add_all_digests, ossl_init_no_add_algs))
 549         return 0;
 550
 551     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 552             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 553         return 0;
 554
 555     if ((opts & OPENSSL_INIT_ATFORK)
 556             && !openssl_init_fork_handlers())
 557         return 0;
 558
 559     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 560             && !RUN_ONCE(&config, ossl_init_no_config))
 561         return 0;
 562
 563     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 564         int ret;
 565         CRYPTO_THREAD_write_lock(init_lock);
 566         appname = (settings == NULL) ? NULL : settings->appname;
 567         ret = RUN_ONCE(&config, ossl_init_config);
 568         CRYPTO_THREAD_unlock(init_lock);
 569         if (!ret)
 570             return 0;
 571     }
 572
 573     if ((opts & OPENSSL_INIT_ASYNC)
 574             && !RUN_ONCE(&async, ossl_init_async))
 575         return 0;
 576
 577 #ifndef OPENSSL_NO_ENGINE
 578     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 579             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 580         return 0;
 581 # if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_DEVCRYPTOENG)
 582     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 583             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 584         return 0;
 585 # endif
 586 # ifndef OPENSSL_NO_RDRAND
 587     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 588             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 589         return 0;
 590 # endif
 591     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 592             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 593         return 0;
 594 # ifndef OPENSSL_NO_STATIC_ENGINE
 595 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 596     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 597             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 598         return 0;
 599 #  endif
 600 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 601     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 602             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 603         return 0;
 604 #  endif
 605 #  if !defined(OPENSSL_NO_AFALGENG)
 606     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 607             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 608         return 0;
 609 #  endif
 610 # endif
 611     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 612                 | OPENSSL_INIT_ENGINE_OPENSSL
 613                 | OPENSSL_INIT_ENGINE_AFALG)) {
 614         ENGINE_register_all_complete();
 615     }
 616 #endif
 617
 618 #ifndef OPENSSL_NO_COMP
 619     if ((opts & OPENSSL_INIT_ZLIB)
 620             && !RUN_ONCE(&zlib, ossl_init_zlib))
 621         return 0;
 622 #endif
 623
 624     return 1;
 625 }
 626
 627 int OPENSSL_atexit(void (*handler)(void))
 628 {
 629     OPENSSL_INIT_STOP *newhand;
 630
 631 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
 632     {
 633         union {
 634             void *sym;
 635             void (*func)(void);
 636         } handlersym;
 637
 638         handlersym.func = handler;
 639 # ifdef DSO_WIN32
 640         {
 641             HMODULE handle = NULL;
 642             BOOL ret;
 643
 644             /*
 645              * We don't use the DSO route for WIN32 because there is a better
 646              * way
 647              */
 648             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 649                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 650                                     handlersym.sym, &handle);
 651
 652             if (!ret)
 653                 return 0;
 654         }
 655 # else
 656         /*
 657          * Deliberately leak a reference to the handler. This will force the
 658          * library/code containing the handler to remain loaded until we run the
 659          * atexit handler. If -znodelete has been used then this is
 660          * unnecessary.
 661          */
 662         {
 663             DSO *dso = NULL;
 664
 665             ERR_set_mark();
 666             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 667             DSO_free(dso);
 668             ERR_pop_to_mark();
 669         }
 670 # endif
 671     }
 672 #endif
 673
 674     newhand = OPENSSL_malloc(sizeof(*newhand));
 675     if (newhand == NULL)
 676         return 0;
 677
 678     newhand->handler = handler;
 679     newhand->next = stop_handlers;
 680     stop_handlers = newhand;
 681
 682     return 1;
 683 }
 684
 685 #ifdef OPENSSL_SYS_UNIX
 686 /*
 687  * The following three functions are for OpenSSL developers.  This is
 688  * where we set/reset state across fork (called via pthread_atfork when
 689  * it exists, or manually by the application when it doesn't).
 690  *
 691  * WARNING!  If you put code in either OPENSSL_fork_parent or
 692  * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
 693  * safe.  See this link, for example:
 694  *      http://man7.org/linux/man-pages/man7/signal-safety.7.html
 695  */
 696
 697 void OPENSSL_fork_prepare(void)
 698 {
 699 }
 700
 701 void OPENSSL_fork_parent(void)
 702 {
 703 }
 704
 705 void OPENSSL_fork_child(void)
 706 {
 707     rand_fork();
 708 }
 709 #endif