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         if (local != NULL && !CRYPTO_THREAD_set_local(&threadstopkey, local)) {
  47             OPENSSL_free(local);
  48             return NULL;
  49         }
  50     }
  51     if (!alloc) {
  52         CRYPTO_THREAD_set_local(&threadstopkey, NULL);
  53     }
  54
  55     return local;
  56 }
  57
  58 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  59 struct ossl_init_stop_st {
  60     void (*handler)(void);
  61     OPENSSL_INIT_STOP *next;
  62 };
  63
  64 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  65 static CRYPTO_RWLOCK *init_lock = NULL;
  66
  67 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  68 static int base_inited = 0;
  69 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  70 {
  71 #ifdef OPENSSL_INIT_DEBUG
  72     fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
  73 #endif
  74 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  75     ossl_malloc_setup_failures();
  76 #endif
  77     /*
  78      * We use a dummy thread local key here. We use the destructor to detect
  79      * when the thread is going to stop (where that feature is available)
  80      */
  81     CRYPTO_THREAD_init_local(&threadstopkey, ossl_init_thread_stop_wrap);
  82 #ifndef OPENSSL_SYS_UEFI
  83     atexit(OPENSSL_cleanup);
  84 #endif
  85     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  86         return 0;
  87     OPENSSL_cpuid_setup();
  88
  89     /*
  90      * BIG FAT WARNING!
  91      * Everything needed to be initialized in this function before threads
  92      * come along MUST happen before base_inited is set to 1, or we will
  93      * see race conditions.
  94      */
  95     base_inited = 1;
  96
  97 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
  98 # ifdef DSO_WIN32
  99     {
 100         HMODULE handle = NULL;
 101         BOOL ret;
 102
 103         /* We don't use the DSO route for WIN32 because there is a better way */
 104         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 105                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 106                                 (void *)&base_inited, &handle);
 107
 108         return (ret == TRUE) ? 1 : 0;
 109     }
 110 # else
 111     /*
 112      * Deliberately leak a reference to ourselves. This will force the library
 113      * to remain loaded until the atexit() handler is run at process exit.
 114      */
 115     {
 116         DSO *dso = NULL;
 117
 118         ERR_set_mark();
 119         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 120         DSO_free(dso);
 121         ERR_pop_to_mark();
 122     }
 123 # endif
 124 #endif
 125
 126     return 1;
 127 }
 128
 129 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 130 static int load_crypto_strings_inited = 0;
 131 DEFINE_RUN_ONCE_STATIC(ossl_init_no_load_crypto_strings)
 132 {
 133     /* Do nothing in this case */
 134     return 1;
 135 }
 136
 137 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 138 {
 139     int ret = 1;
 140     /*
 141      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 142      * pulling in all the error strings during static linking
 143      */
 144 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 145 # ifdef OPENSSL_INIT_DEBUG
 146     fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
 147                     "err_load_crypto_strings_int()\n");
 148 # endif
 149     ret = err_load_crypto_strings_int();
 150     load_crypto_strings_inited = 1;
 151 #endif
 152     return ret;
 153 }
 154
 155 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 156 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 157 {
 158     /*
 159      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 160      * pulling in all the ciphers during static linking
 161      */
 162 #ifndef OPENSSL_NO_AUTOALGINIT
 163 # ifdef OPENSSL_INIT_DEBUG
 164     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
 165                     "openssl_add_all_ciphers_int()\n");
 166 # endif
 167     openssl_add_all_ciphers_int();
 168 #endif
 169     return 1;
 170 }
 171
 172 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 173 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 174 {
 175     /*
 176      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 177      * pulling in all the ciphers during static linking
 178      */
 179 #ifndef OPENSSL_NO_AUTOALGINIT
 180 # ifdef OPENSSL_INIT_DEBUG
 181     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
 182                     "openssl_add_all_digests()\n");
 183 # endif
 184     openssl_add_all_digests_int();
 185 #endif
 186     return 1;
 187 }
 188
 189 DEFINE_RUN_ONCE_STATIC(ossl_init_no_add_algs)
 190 {
 191     /* Do nothing */
 192     return 1;
 193 }
 194
 195 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 196 static int config_inited = 0;
 197 static const char *appname;
 198 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 199 {
 200 #ifdef OPENSSL_INIT_DEBUG
 201     fprintf(stderr,
 202             "OPENSSL_INIT: ossl_init_config: openssl_config(%s)\n",
 203             appname == NULL ? "NULL" : appname);
 204 #endif
 205     openssl_config_int(appname);
 206     config_inited = 1;
 207     return 1;
 208 }
 209 DEFINE_RUN_ONCE_STATIC(ossl_init_no_config)
 210 {
 211 #ifdef OPENSSL_INIT_DEBUG
 212     fprintf(stderr,
 213             "OPENSSL_INIT: ossl_init_config: openssl_no_config_int()\n");
 214 #endif
 215     openssl_no_config_int();
 216     config_inited = 1;
 217     return 1;
 218 }
 219
 220 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 221 static int async_inited = 0;
 222 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 223 {
 224 #ifdef OPENSSL_INIT_DEBUG
 225     fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
 226 #endif
 227     if (!async_init())
 228         return 0;
 229     async_inited = 1;
 230     return 1;
 231 }
 232
 233 #ifndef OPENSSL_NO_ENGINE
 234 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 235 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 236 {
 237 # ifdef OPENSSL_INIT_DEBUG
 238     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
 239                     "engine_load_openssl_int()\n");
 240 # endif
 241     engine_load_openssl_int();
 242     return 1;
 243 }
 244
 245 # ifndef OPENSSL_NO_RDRAND
 246 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 247 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 248 {
 249 #  ifdef OPENSSL_INIT_DEBUG
 250     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
 251                     "engine_load_rdrand_int()\n");
 252 #  endif
 253     engine_load_rdrand_int();
 254     return 1;
 255 }
 256 # endif
 257 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 258 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 259 {
 260 # ifdef OPENSSL_INIT_DEBUG
 261     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
 262                     "engine_load_dynamic_int()\n");
 263 # endif
 264     engine_load_dynamic_int();
 265     return 1;
 266 }
 267 # ifndef OPENSSL_NO_STATIC_ENGINE
 268 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 269 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 270 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 271 {
 272 #   ifdef OPENSSL_INIT_DEBUG
 273     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
 274                     "engine_load_padlock_int()\n");
 275 #   endif
 276     engine_load_padlock_int();
 277     return 1;
 278 }
 279 #  endif
 280 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 281 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 282 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 283 {
 284 #   ifdef OPENSSL_INIT_DEBUG
 285     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
 286                     "engine_load_capi_int()\n");
 287 #   endif
 288     engine_load_capi_int();
 289     return 1;
 290 }
 291 #  endif
 292 #  if !defined(OPENSSL_NO_AFALGENG)
 293 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 294 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 295 {
 296 #   ifdef OPENSSL_INIT_DEBUG
 297     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "
 298                     "engine_load_afalg_int()\n");
 299 #   endif
 300     engine_load_afalg_int();
 301     return 1;
 302 }
 303 #  endif
 304 # endif
 305 #endif
 306
 307 #ifndef OPENSSL_NO_COMP
 308 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 309
 310 static int zlib_inited = 0;
 311 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 312 {
 313     /* Do nothing - we need to know about this for the later cleanup */
 314     zlib_inited = 1;
 315     return 1;
 316 }
 317 #endif
 318
 319 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
 320 {
 321     /* Can't do much about this */
 322     if (locals == NULL)
 323         return;
 324
 325     if (locals->async) {
 326 #ifdef OPENSSL_INIT_DEBUG
 327         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 328                         "ASYNC_cleanup_thread()\n");
 329 #endif
 330         ASYNC_cleanup_thread();
 331     }
 332
 333     if (locals->err_state) {
 334 #ifdef OPENSSL_INIT_DEBUG
 335         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 336                         "err_delete_thread_state()\n");
 337 #endif
 338         err_delete_thread_state();
 339     }
 340
 341     OPENSSL_free(locals);
 342 }
 343
 344 void OPENSSL_thread_stop(void)
 345 {
 346     ossl_init_thread_stop(
 347         (struct thread_local_inits_st *)ossl_init_get_thread_local(0));
 348 }
 349
 350 int ossl_init_thread_start(uint64_t opts)
 351 {
 352     struct thread_local_inits_st *locals;
 353
 354     if (!OPENSSL_init_crypto(0, NULL))
 355         return 0;
 356
 357     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 # ifndef OPENSSL_NO_RDRAND
 564     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 565             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 566         return 0;
 567 # endif
 568     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 569             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 570         return 0;
 571 # ifndef OPENSSL_NO_STATIC_ENGINE
 572 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 573     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 574             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 575         return 0;
 576 #  endif
 577 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 578     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 579             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 580         return 0;
 581 #  endif
 582 #  if !defined(OPENSSL_NO_AFALGENG)
 583     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 584             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 585         return 0;
 586 #  endif
 587 # endif
 588     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 589                 | OPENSSL_INIT_ENGINE_OPENSSL
 590                 | OPENSSL_INIT_ENGINE_AFALG)) {
 591         ENGINE_register_all_complete();
 592     }
 593 #endif
 594
 595 #ifndef OPENSSL_NO_COMP
 596     if ((opts & OPENSSL_INIT_ZLIB)
 597             && !RUN_ONCE(&zlib, ossl_init_zlib))
 598         return 0;
 599 #endif
 600
 601     return 1;
 602 }
 603
 604 int OPENSSL_atexit(void (*handler)(void))
 605 {
 606     OPENSSL_INIT_STOP *newhand;
 607
 608 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
 609     {
 610         union {
 611             void *sym;
 612             void (*func)(void);
 613         } handlersym;
 614
 615         handlersym.func = handler;
 616 # ifdef DSO_WIN32
 617         {
 618             HMODULE handle = NULL;
 619             BOOL ret;
 620
 621             /*
 622              * We don't use the DSO route for WIN32 because there is a better
 623              * way
 624              */
 625             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 626                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 627                                     handlersym.sym, &handle);
 628
 629             if (!ret)
 630                 return 0;
 631         }
 632 # else
 633         /*
 634          * Deliberately leak a reference to the handler. This will force the
 635          * library/code containing the handler to remain loaded until we run the
 636          * atexit handler. If -znodelete has been used then this is
 637          * unneccessary.
 638          */
 639         {
 640             DSO *dso = NULL;
 641
 642             ERR_set_mark();
 643             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 644             DSO_free(dso);
 645             ERR_pop_to_mark();
 646         }
 647 # endif
 648     }
 649 #endif
 650
 651     newhand = OPENSSL_malloc(sizeof(*newhand));
 652     if (newhand == NULL)
 653         return 0;
 654
 655     newhand->handler = handler;
 656     newhand->next = stop_handlers;
 657     stop_handlers = newhand;
 658
 659     return 1;
 660 }