crypto/init.c

   1 /*
   2  * Copyright 2016-2018 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 "e_os.h"
  11 #include "internal/cryptlib_int.h"
  12 #include <openssl/err.h>
  13 #include "internal/rand_int.h"
  14 #include "internal/bio.h"
  15 #include <openssl/evp.h>
  16 #include "internal/evp_int.h"
  17 #include "internal/conf.h"
  18 #include "internal/async.h"
  19 #include "internal/engine.h"
  20 #include "internal/comp.h"
  21 #include "internal/err.h"
  22 #include "internal/err_int.h"
  23 #include "internal/objects.h"
  24 #include <stdlib.h>
  25 #include <assert.h>
  26 #include "internal/thread_once.h"
  27 #include "internal/dso.h"
  28 #include "internal/store.h"
  29
  30 static int stopped = 0;
  31
  32 static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
  33
  34 static CRYPTO_THREAD_LOCAL threadstopkey;
  35
  36 static void ossl_init_thread_stop_wrap(void *local)
  37 {
  38     ossl_init_thread_stop((struct thread_local_inits_st *)local);
  39 }
  40
  41 static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
  42 {
  43     struct thread_local_inits_st *local =
  44         CRYPTO_THREAD_get_local(&threadstopkey);
  45
  46     if (local == NULL && alloc) {
  47         local = OPENSSL_zalloc(sizeof(*local));
  48         if (local != NULL && !CRYPTO_THREAD_set_local(&threadstopkey, local)) {
  49             OPENSSL_free(local);
  50             return NULL;
  51         }
  52     }
  53     if (!alloc) {
  54         CRYPTO_THREAD_set_local(&threadstopkey, NULL);
  55     }
  56
  57     return local;
  58 }
  59
  60 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  61 struct ossl_init_stop_st {
  62     void (*handler)(void);
  63     OPENSSL_INIT_STOP *next;
  64 };
  65
  66 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  67 static CRYPTO_RWLOCK *init_lock = NULL;
  68
  69 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  70 static int base_inited = 0;
  71 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  72 {
  73 #ifdef OPENSSL_INIT_DEBUG
  74     fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
  75 #endif
  76 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  77     ossl_malloc_setup_failures();
  78 #endif
  79     /*
  80      * We use a dummy thread local key here. We use the destructor to detect
  81      * when the thread is going to stop (where that feature is available)
  82      */
  83     CRYPTO_THREAD_init_local(&threadstopkey, ossl_init_thread_stop_wrap);
  84 #ifndef OPENSSL_SYS_UEFI
  85     atexit(OPENSSL_cleanup);
  86 #endif
  87     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  88         return 0;
  89     OPENSSL_cpuid_setup();
  90
  91     /*
  92      * BIG FAT WARNING!
  93      * Everything needed to be initialized in this function before threads
  94      * come along MUST happen before base_inited is set to 1, or we will
  95      * see race conditions.
  96      */
  97     base_inited = 1;
  98
  99 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
 100 # ifdef DSO_WIN32
 101     {
 102         HMODULE handle = NULL;
 103         BOOL ret;
 104
 105         /* We don't use the DSO route for WIN32 because there is a better way */
 106         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 107                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 108                                 (void *)&base_inited, &handle);
 109
 110         return (ret == TRUE) ? 1 : 0;
 111     }
 112 # else
 113     /*
 114      * Deliberately leak a reference to ourselves. This will force the library
 115      * to remain loaded until the atexit() handler is run at process exit.
 116      */
 117     {
 118         DSO *dso = NULL;
 119
 120         ERR_set_mark();
 121         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 122         DSO_free(dso);
 123         ERR_pop_to_mark();
 124     }
 125 # endif
 126 #endif
 127
 128     return 1;
 129 }
 130
 131 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 132 static int load_crypto_strings_inited = 0;
 133 DEFINE_RUN_ONCE_STATIC(ossl_init_no_load_crypto_strings)
 134 {
 135     /* Do nothing in this case */
 136     return 1;
 137 }
 138
 139 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 140 {
 141     int ret = 1;
 142     /*
 143      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 144      * pulling in all the error strings during static linking
 145      */
 146 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 147 # ifdef OPENSSL_INIT_DEBUG
 148     fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
 149                     "err_load_crypto_strings_int()\n");
 150 # endif
 151     ret = err_load_crypto_strings_int();
 152     load_crypto_strings_inited = 1;
 153 #endif
 154     return ret;
 155 }
 156
 157 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 158 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 159 {
 160     /*
 161      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 162      * pulling in all the ciphers during static linking
 163      */
 164 #ifndef OPENSSL_NO_AUTOALGINIT
 165 # ifdef OPENSSL_INIT_DEBUG
 166     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
 167                     "openssl_add_all_ciphers_int()\n");
 168 # endif
 169     openssl_add_all_ciphers_int();
 170 #endif
 171     return 1;
 172 }
 173
 174 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 175 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 176 {
 177     /*
 178      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 179      * pulling in all the ciphers during static linking
 180      */
 181 #ifndef OPENSSL_NO_AUTOALGINIT
 182 # ifdef OPENSSL_INIT_DEBUG
 183     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
 184                     "openssl_add_all_digests()\n");
 185 # endif
 186     openssl_add_all_digests_int();
 187 #endif
 188     return 1;
 189 }
 190
 191 DEFINE_RUN_ONCE_STATIC(ossl_init_no_add_algs)
 192 {
 193     /* Do nothing */
 194     return 1;
 195 }
 196
 197 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 198 static int config_inited = 0;
 199 static const char *appname;
 200 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 201 {
 202 #ifdef OPENSSL_INIT_DEBUG
 203     fprintf(stderr,
 204             "OPENSSL_INIT: ossl_init_config: openssl_config(%s)\n",
 205             appname == NULL ? "NULL" : appname);
 206 #endif
 207     openssl_config_int(appname);
 208     config_inited = 1;
 209     return 1;
 210 }
 211 DEFINE_RUN_ONCE_STATIC(ossl_init_no_config)
 212 {
 213 #ifdef OPENSSL_INIT_DEBUG
 214     fprintf(stderr,
 215             "OPENSSL_INIT: ossl_init_config: openssl_no_config_int()\n");
 216 #endif
 217     openssl_no_config_int();
 218     config_inited = 1;
 219     return 1;
 220 }
 221
 222 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 223 static int async_inited = 0;
 224 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 225 {
 226 #ifdef OPENSSL_INIT_DEBUG
 227     fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
 228 #endif
 229     if (!async_init())
 230         return 0;
 231     async_inited = 1;
 232     return 1;
 233 }
 234
 235 #ifndef OPENSSL_NO_ENGINE
 236 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 237 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 238 {
 239 # ifdef OPENSSL_INIT_DEBUG
 240     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
 241                     "engine_load_openssl_int()\n");
 242 # endif
 243     engine_load_openssl_int();
 244     return 1;
 245 }
 246 # ifndef OPENSSL_NO_DEVCRYPTOENG
 247 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 248 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 249 {
 250 #  ifdef OPENSSL_INIT_DEBUG
 251     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_devcrypto: "
 252                     "engine_load_devcrypto_int()\n");
 253 #  endif
 254     engine_load_devcrypto_int();
 255     return 1;
 256 }
 257 # endif
 258
 259 # ifndef OPENSSL_NO_RDRAND
 260 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 261 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 262 {
 263 #  ifdef OPENSSL_INIT_DEBUG
 264     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
 265                     "engine_load_rdrand_int()\n");
 266 #  endif
 267     engine_load_rdrand_int();
 268     return 1;
 269 }
 270 # endif
 271 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 272 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 273 {
 274 # ifdef OPENSSL_INIT_DEBUG
 275     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
 276                     "engine_load_dynamic_int()\n");
 277 # endif
 278     engine_load_dynamic_int();
 279     return 1;
 280 }
 281 # ifndef OPENSSL_NO_STATIC_ENGINE
 282 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 283 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 284 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 285 {
 286 #   ifdef OPENSSL_INIT_DEBUG
 287     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
 288                     "engine_load_padlock_int()\n");
 289 #   endif
 290     engine_load_padlock_int();
 291     return 1;
 292 }
 293 #  endif
 294 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 295 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 296 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 297 {
 298 #   ifdef OPENSSL_INIT_DEBUG
 299     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
 300                     "engine_load_capi_int()\n");
 301 #   endif
 302     engine_load_capi_int();
 303     return 1;
 304 }
 305 #  endif
 306 #  if !defined(OPENSSL_NO_AFALGENG)
 307 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 308 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 309 {
 310 #   ifdef OPENSSL_INIT_DEBUG
 311     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "
 312                     "engine_load_afalg_int()\n");
 313 #   endif
 314     engine_load_afalg_int();
 315     return 1;
 316 }
 317 #  endif
 318 # endif
 319 #endif
 320
 321 #ifndef OPENSSL_NO_COMP
 322 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 323
 324 static int zlib_inited = 0;
 325 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 326 {
 327     /* Do nothing - we need to know about this for the later cleanup */
 328     zlib_inited = 1;
 329     return 1;
 330 }
 331 #endif
 332
 333 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
 334 {
 335     /* Can't do much about this */
 336     if (locals == NULL)
 337         return;
 338
 339     if (locals->async) {
 340 #ifdef OPENSSL_INIT_DEBUG
 341         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 342                         "ASYNC_cleanup_thread()\n");
 343 #endif
 344         ASYNC_cleanup_thread();
 345     }
 346
 347     if (locals->err_state) {
 348 #ifdef OPENSSL_INIT_DEBUG
 349         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 350                         "err_delete_thread_state()\n");
 351 #endif
 352         err_delete_thread_state();
 353     }
 354
 355     OPENSSL_free(locals);
 356 }
 357
 358 void OPENSSL_thread_stop(void)
 359 {
 360     ossl_init_thread_stop(
 361         (struct thread_local_inits_st *)ossl_init_get_thread_local(0));
 362 }
 363
 364 int ossl_init_thread_start(uint64_t opts)
 365 {
 366     struct thread_local_inits_st *locals;
 367
 368     if (!OPENSSL_init_crypto(0, NULL))
 369         return 0;
 370
 371     locals = ossl_init_get_thread_local(1);
 372
 373     if (locals == NULL)
 374         return 0;
 375
 376     if (opts & OPENSSL_INIT_THREAD_ASYNC) {
 377 #ifdef OPENSSL_INIT_DEBUG
 378         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
 379                         "marking thread for async\n");
 380 #endif
 381         locals->async = 1;
 382     }
 383
 384     if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
 385 #ifdef OPENSSL_INIT_DEBUG
 386         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
 387                         "marking thread for err_state\n");
 388 #endif
 389         locals->err_state = 1;
 390     }
 391
 392     return 1;
 393 }
 394
 395 void OPENSSL_cleanup(void)
 396 {
 397     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 398
 399     /* If we've not been inited then no need to deinit */
 400     if (!base_inited)
 401         return;
 402
 403     /* Might be explicitly called and also by atexit */
 404     if (stopped)
 405         return;
 406     stopped = 1;
 407
 408     /*
 409      * Thread stop may not get automatically called by the thread library for
 410      * the very last thread in some situations, so call it directly.
 411      */
 412     ossl_init_thread_stop(ossl_init_get_thread_local(0));
 413
 414     currhandler = stop_handlers;
 415     while (currhandler != NULL) {
 416         currhandler->handler();
 417         lasthandler = currhandler;
 418         currhandler = currhandler->next;
 419         OPENSSL_free(lasthandler);
 420     }
 421     stop_handlers = NULL;
 422
 423     CRYPTO_THREAD_lock_free(init_lock);
 424     init_lock = NULL;
 425
 426     /*
 427      * We assume we are single-threaded for this function, i.e. no race
 428      * conditions for the various "*_inited" vars below.
 429      */
 430
 431 #ifndef OPENSSL_NO_COMP
 432     if (zlib_inited) {
 433 #ifdef OPENSSL_INIT_DEBUG
 434         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 435                         "comp_zlib_cleanup_int()\n");
 436 #endif
 437         comp_zlib_cleanup_int();
 438     }
 439 #endif
 440
 441     if (async_inited) {
 442 # ifdef OPENSSL_INIT_DEBUG
 443         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 444                         "async_deinit()\n");
 445 # endif
 446         async_deinit();
 447     }
 448
 449     if (load_crypto_strings_inited) {
 450 #ifdef OPENSSL_INIT_DEBUG
 451         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 452                         "err_free_strings_int()\n");
 453 #endif
 454         err_free_strings_int();
 455     }
 456
 457     CRYPTO_THREAD_cleanup_local(&threadstopkey);
 458
 459 #ifdef OPENSSL_INIT_DEBUG
 460     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 461                     "rand_cleanup_int()\n");
 462     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 463                     "conf_modules_free_int()\n");
 464 #ifndef OPENSSL_NO_ENGINE
 465     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 466                     "engine_cleanup_int()\n");
 467 #endif
 468     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 469                     "crypto_cleanup_all_ex_data_int()\n");
 470     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 471                     "bio_sock_cleanup_int()\n");
 472     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 473                     "bio_cleanup()\n");
 474     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 475                     "evp_cleanup_int()\n");
 476     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 477                     "obj_cleanup_int()\n");
 478     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 479                     "err_cleanup()\n");
 480 #endif
 481     /*
 482      * Note that cleanup order is important:
 483      * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
 484      * must be called before engine_cleanup_int()
 485      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 486      * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
 487      * - conf_modules_free_int() can end up in ENGINE code so must be called
 488      * before engine_cleanup_int()
 489      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 490      * obj_cleanup_int() must be called last
 491      */
 492     rand_cleanup_int();
 493     rand_drbg_cleanup_int();
 494     conf_modules_free_int();
 495 #ifndef OPENSSL_NO_ENGINE
 496     engine_cleanup_int();
 497 #endif
 498     ossl_store_cleanup_int();
 499     crypto_cleanup_all_ex_data_int();
 500     bio_cleanup();
 501     evp_cleanup_int();
 502     obj_cleanup_int();
 503     err_cleanup();
 504
 505     CRYPTO_secure_malloc_done();
 506
 507     base_inited = 0;
 508 }
 509
 510 /*
 511  * If this function is called with a non NULL settings value then it must be
 512  * called prior to any threads making calls to any OpenSSL functions,
 513  * i.e. passing a non-null settings value is assumed to be single-threaded.
 514  */
 515 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 516 {
 517     static int stoperrset = 0;
 518
 519     if (stopped) {
 520         if (!stoperrset) {
 521             /*
 522              * We only ever set this once to avoid getting into an infinite
 523              * loop where the error system keeps trying to init and fails so
 524              * sets an error etc
 525              */
 526             stoperrset = 1;
 527             CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
 528         }
 529         return 0;
 530     }
 531
 532     if (!base_inited && !RUN_ONCE(&base, ossl_init_base))
 533         return 0;
 534
 535     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 536             && !RUN_ONCE(&load_crypto_strings,
 537                          ossl_init_no_load_crypto_strings))
 538         return 0;
 539
 540     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 541             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 542         return 0;
 543
 544     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 545             && !RUN_ONCE(&add_all_ciphers, ossl_init_no_add_algs))
 546         return 0;
 547
 548     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 549             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 550         return 0;
 551
 552     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 553             && !RUN_ONCE(&add_all_digests, ossl_init_no_add_algs))
 554         return 0;
 555
 556     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 557             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 558         return 0;
 559
 560     if ((opts & OPENSSL_INIT_ATFORK)
 561             && !openssl_init_fork_handlers())
 562         return 0;
 563
 564     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 565             && !RUN_ONCE(&config, ossl_init_no_config))
 566         return 0;
 567
 568     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 569         int ret;
 570         CRYPTO_THREAD_write_lock(init_lock);
 571         appname = (settings == NULL) ? NULL : settings->appname;
 572         ret = RUN_ONCE(&config, ossl_init_config);
 573         CRYPTO_THREAD_unlock(init_lock);
 574         if (!ret)
 575             return 0;
 576     }
 577
 578     if ((opts & OPENSSL_INIT_ASYNC)
 579             && !RUN_ONCE(&async, ossl_init_async))
 580         return 0;
 581
 582 #ifndef OPENSSL_NO_ENGINE
 583     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 584             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 585         return 0;
 586 # if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_DEVCRYPTOENG)
 587     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 588             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 589         return 0;
 590 # endif
 591 # ifndef OPENSSL_NO_RDRAND
 592     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 593             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 594         return 0;
 595 # endif
 596     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 597             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 598         return 0;
 599 # ifndef OPENSSL_NO_STATIC_ENGINE
 600 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 601     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 602             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 603         return 0;
 604 #  endif
 605 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 606     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 607             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 608         return 0;
 609 #  endif
 610 #  if !defined(OPENSSL_NO_AFALGENG)
 611     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 612             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 613         return 0;
 614 #  endif
 615 # endif
 616     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 617                 | OPENSSL_INIT_ENGINE_OPENSSL
 618                 | OPENSSL_INIT_ENGINE_AFALG)) {
 619         ENGINE_register_all_complete();
 620     }
 621 #endif
 622
 623 #ifndef OPENSSL_NO_COMP
 624     if ((opts & OPENSSL_INIT_ZLIB)
 625             && !RUN_ONCE(&zlib, ossl_init_zlib))
 626         return 0;
 627 #endif
 628
 629     return 1;
 630 }
 631
 632 int OPENSSL_atexit(void (*handler)(void))
 633 {
 634     OPENSSL_INIT_STOP *newhand;
 635
 636 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
 637     {
 638         union {
 639             void *sym;
 640             void (*func)(void);
 641         } handlersym;
 642
 643         handlersym.func = handler;
 644 # ifdef DSO_WIN32
 645         {
 646             HMODULE handle = NULL;
 647             BOOL ret;
 648
 649             /*
 650              * We don't use the DSO route for WIN32 because there is a better
 651              * way
 652              */
 653             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 654                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 655                                     handlersym.sym, &handle);
 656
 657             if (!ret)
 658                 return 0;
 659         }
 660 # else
 661         /*
 662          * Deliberately leak a reference to the handler. This will force the
 663          * library/code containing the handler to remain loaded until we run the
 664          * atexit handler. If -znodelete has been used then this is
 665          * unnecessary.
 666          */
 667         {
 668             DSO *dso = NULL;
 669
 670             ERR_set_mark();
 671             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 672             DSO_free(dso);
 673             ERR_pop_to_mark();
 674         }
 675 # endif
 676     }
 677 #endif
 678
 679     newhand = OPENSSL_malloc(sizeof(*newhand));
 680     if (newhand == NULL)
 681         return 0;
 682
 683     newhand->handler = handler;
 684     newhand->next = stop_handlers;
 685     stop_handlers = newhand;
 686
 687     return 1;
 688 }
 689
 690 #ifdef OPENSSL_SYS_UNIX
 691 /*
 692  * The following three functions are for OpenSSL developers.  This is
 693  * where we set/reset state across fork (called via pthread_atfork when
 694  * it exists, or manually by the application when it doesn't).
 695  *
 696  * WARNING!  If you put code in either OPENSSL_fork_parent or
 697  * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
 698  * safe.  See this link, for example:
 699  *      http://man7.org/linux/man-pages/man7/signal-safety.7.html
 700  */
 701
 702 void OPENSSL_fork_prepare(void)
 703 {
 704 }
 705
 706 void OPENSSL_fork_parent(void)
 707 {
 708 }
 709
 710 void OPENSSL_fork_child(void)
 711 {
 712     rand_fork();
 713 }
 714 #endif