Cryptlib/OpenSSL/crypto/init.c

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