crypto/init.c

   1 /*
   2  * Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 /* We need to use some engine deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 #include "e_os.h"
  14 #include "crypto/cryptlib.h"
  15 #include <openssl/err.h>
  16 #include "crypto/rand.h"
  17 #include "internal/bio.h"
  18 #include <openssl/evp.h>
  19 #include "crypto/evp.h"
  20 #include "internal/conf.h"
  21 #include "crypto/async.h"
  22 #include "crypto/engine.h"
  23 #include "internal/comp.h"
  24 #include "internal/err.h"
  25 #include "crypto/err.h"
  26 #include "crypto/objects.h"
  27 #include <stdlib.h>
  28 #include <assert.h>
  29 #include "internal/thread_once.h"
  30 #include "crypto/dso_conf.h"
  31 #include "internal/dso.h"
  32 #include "crypto/store.h"
  33 #include <openssl/cmp_util.h> /* for OSSL_CMP_log_close() */
  34 #include <openssl/trace.h>
  35
  36 static int stopped = 0;
  37
  38 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  39 struct ossl_init_stop_st {
  40     void (*handler)(void);
  41     OPENSSL_INIT_STOP *next;
  42 };
  43
  44 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  45 static CRYPTO_RWLOCK *init_lock = NULL;
  46
  47 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  48 static int base_inited = 0;
  49 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  50 {
  51     /* no need to init trace */
  52
  53     OSSL_TRACE(INIT, "ossl_init_base: setting up stop handlers\n");
  54 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  55     ossl_malloc_setup_failures();
  56 #endif
  57
  58     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  59         goto err;
  60     OPENSSL_cpuid_setup();
  61
  62     if (!ossl_init_thread())
  63         return 0;
  64
  65     base_inited = 1;
  66     return 1;
  67
  68 err:
  69     OSSL_TRACE(INIT, "ossl_init_base failed!\n");
  70     CRYPTO_THREAD_lock_free(init_lock);
  71     init_lock = NULL;
  72
  73     return 0;
  74 }
  75
  76 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
  77 #if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
  78 static int win32atexit(void)
  79 {
  80     OPENSSL_cleanup();
  81     return 0;
  82 }
  83 #endif
  84
  85 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
  86 {
  87 #ifdef OPENSSL_INIT_DEBUG
  88     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
  89 #endif
  90 #ifndef OPENSSL_SYS_UEFI
  91 # ifdef _WIN32
  92     /* We use _onexit() in preference because it gets called on DLL unload */
  93     if (_onexit(win32atexit) == NULL)
  94         return 0;
  95 # else
  96     if (atexit(OPENSSL_cleanup) != 0)
  97         return 0;
  98 # endif
  99 #endif
 100
 101     return 1;
 102 }
 103
 104 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 105                            ossl_init_register_atexit)
 106 {
 107 #ifdef OPENSSL_INIT_DEBUG
 108     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 109 #endif
 110     /* Do nothing in this case */
 111     return 1;
 112 }
 113
 114 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 115 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 116 {
 117     OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
 118
 119 #if !defined(OPENSSL_USE_NODELETE) \
 120     && !defined(OPENSSL_NO_PINSHARED)
 121 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 122     {
 123         HMODULE handle = NULL;
 124         BOOL ret;
 125
 126         /* We don't use the DSO route for WIN32 because there is a better way */
 127         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 128                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 129                                 (void *)&base_inited, &handle);
 130
 131         OSSL_TRACE1(INIT,
 132                     "ossl_init_load_crypto_nodelete: "
 133                     "obtained DSO reference? %s\n",
 134                     (ret == TRUE ? "No!" : "Yes."));
 135         return (ret == TRUE) ? 1 : 0;
 136     }
 137 # elif !defined(DSO_NONE)
 138     /*
 139      * Deliberately leak a reference to ourselves. This will force the library
 140      * to remain loaded until the atexit() handler is run at process exit.
 141      */
 142     {
 143         DSO *dso;
 144         void *err;
 145
 146         if (!err_shelve_state(&err))
 147             return 0;
 148
 149         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 150         /*
 151          * In case of No!, it is uncertain our exit()-handlers can still be
 152          * called. After dlclose() the whole library might have been unloaded
 153          * already.
 154          */
 155         OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
 156                     (dso == NULL ? "No!" : "Yes."));
 157         DSO_free(dso);
 158         err_unshelve_state(err);
 159     }
 160 # endif
 161 #endif
 162
 163     return 1;
 164 }
 165
 166 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 167 static int load_crypto_strings_inited = 0;
 168 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 169 {
 170     int ret = 1;
 171     /*
 172      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 173      * pulling in all the error strings during static linking
 174      */
 175 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 176     OSSL_TRACE(INIT, "err_load_crypto_strings_int()\n");
 177     ret = err_load_crypto_strings_int();
 178     load_crypto_strings_inited = 1;
 179 #endif
 180     return ret;
 181 }
 182
 183 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 184                            ossl_init_load_crypto_strings)
 185 {
 186     /* Do nothing in this case */
 187     return 1;
 188 }
 189
 190 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 191 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 192 {
 193     /*
 194      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 195      * pulling in all the ciphers during static linking
 196      */
 197 #ifndef OPENSSL_NO_AUTOALGINIT
 198     OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
 199     openssl_add_all_ciphers_int();
 200 #endif
 201     return 1;
 202 }
 203
 204 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 205                            ossl_init_add_all_ciphers)
 206 {
 207     /* Do nothing */
 208     return 1;
 209 }
 210
 211 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 212 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 213 {
 214     /*
 215      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 216      * pulling in all the ciphers during static linking
 217      */
 218 #ifndef OPENSSL_NO_AUTOALGINIT
 219     OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
 220     openssl_add_all_digests_int();
 221 #endif
 222     return 1;
 223 }
 224
 225 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 226                            ossl_init_add_all_digests)
 227 {
 228     /* Do nothing */
 229     return 1;
 230 }
 231
 232 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 233 static int config_inited = 0;
 234 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
 235 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 236 {
 237     int ret = openssl_config_int(conf_settings);
 238     config_inited = 1;
 239     return ret;
 240 }
 241 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 242 {
 243     OSSL_TRACE(INIT, "openssl_no_config_int()\n");
 244     openssl_no_config_int();
 245     config_inited = 1;
 246     return 1;
 247 }
 248
 249 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 250 static int async_inited = 0;
 251 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 252 {
 253     OSSL_TRACE(INIT, "async_init()\n");
 254     if (!async_init())
 255         return 0;
 256     async_inited = 1;
 257     return 1;
 258 }
 259
 260 #ifndef OPENSSL_NO_ENGINE
 261 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 262 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 263 {
 264     OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
 265     engine_load_openssl_int();
 266     return 1;
 267 }
 268 # ifndef OPENSSL_NO_RDRAND
 269 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 270 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 271 {
 272     OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
 273     engine_load_rdrand_int();
 274     return 1;
 275 }
 276 # endif
 277 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 278 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 279 {
 280     OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
 281     engine_load_dynamic_int();
 282     return 1;
 283 }
 284 # ifndef OPENSSL_NO_STATIC_ENGINE
 285 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 286 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 287 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 288 {
 289     OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
 290     engine_load_devcrypto_int();
 291     return 1;
 292 }
 293 #  endif
 294 #  if !defined(OPENSSL_NO_PADLOCKENG)
 295 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 296 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 297 {
 298     OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
 299     engine_load_padlock_int();
 300     return 1;
 301 }
 302 #  endif
 303 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 304 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 305 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 306 {
 307     OSSL_TRACE(INIT, "engine_load_capi_int()\n");
 308     engine_load_capi_int();
 309     return 1;
 310 }
 311 #  endif
 312 #  if !defined(OPENSSL_NO_AFALGENG)
 313 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 314 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 315 {
 316     OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
 317     engine_load_afalg_int();
 318     return 1;
 319 }
 320 #  endif
 321 # endif
 322 #endif
 323
 324 #ifndef OPENSSL_NO_COMP
 325 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 326
 327 static int zlib_inited = 0;
 328 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 329 {
 330     /* Do nothing - we need to know about this for the later cleanup */
 331     zlib_inited = 1;
 332     return 1;
 333 }
 334 #endif
 335
 336 void OPENSSL_cleanup(void)
 337 {
 338     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 339
 340     /*
 341      * TODO(3.0): This function needs looking at with a view to moving most/all
 342      * of this into onfree handlers in OPENSSL_CTX.
 343      */
 344
 345     /* If we've not been inited then no need to deinit */
 346     if (!base_inited)
 347         return;
 348
 349     /* Might be explicitly called and also by atexit */
 350     if (stopped)
 351         return;
 352     stopped = 1;
 353
 354     /*
 355      * Thread stop may not get automatically called by the thread library for
 356      * the very last thread in some situations, so call it directly.
 357      */
 358     OPENSSL_thread_stop();
 359
 360     currhandler = stop_handlers;
 361     while (currhandler != NULL) {
 362         currhandler->handler();
 363         lasthandler = currhandler;
 364         currhandler = currhandler->next;
 365         OPENSSL_free(lasthandler);
 366     }
 367     stop_handlers = NULL;
 368
 369     CRYPTO_THREAD_lock_free(init_lock);
 370     init_lock = NULL;
 371
 372     /*
 373      * We assume we are single-threaded for this function, i.e. no race
 374      * conditions for the various "*_inited" vars below.
 375      */
 376
 377 #ifndef OPENSSL_NO_COMP
 378     if (zlib_inited) {
 379         OSSL_TRACE(INIT, "OPENSSL_cleanup: comp_zlib_cleanup_int()\n");
 380         comp_zlib_cleanup_int();
 381     }
 382 #endif
 383
 384     if (async_inited) {
 385         OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
 386         async_deinit();
 387     }
 388
 389     if (load_crypto_strings_inited) {
 390         OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
 391         err_free_strings_int();
 392     }
 393
 394     /*
 395      * Note that cleanup order is important:
 396      * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
 397      * must be called before engine_cleanup_int()
 398      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 399      * before the ex data handlers are wiped during default openssl_ctx deinit.
 400      * - conf_modules_free_int() can end up in ENGINE code so must be called
 401      * before engine_cleanup_int()
 402      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 403      * obj_cleanup_int() must be called last
 404      */
 405     OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_cleanup_int()\n");
 406     rand_cleanup_int();
 407
 408     OSSL_TRACE(INIT, "OPENSSL_cleanup: conf_modules_free_int()\n");
 409     conf_modules_free_int();
 410
 411 #ifndef OPENSSL_NO_ENGINE
 412     OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
 413     engine_cleanup_int();
 414 #endif
 415     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
 416     ossl_store_cleanup_int();
 417
 418     OSSL_TRACE(INIT, "OPENSSL_cleanup: openssl_ctx_default_deinit()\n");
 419     openssl_ctx_default_deinit();
 420
 421     ossl_cleanup_thread();
 422
 423     OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
 424     bio_cleanup();
 425
 426     OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
 427     evp_cleanup_int();
 428
 429     OSSL_TRACE(INIT, "OPENSSL_cleanup: obj_cleanup_int()\n");
 430     obj_cleanup_int();
 431
 432     OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
 433     err_cleanup();
 434
 435     OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
 436     CRYPTO_secure_malloc_done();
 437
 438 #ifndef OPENSSL_NO_CMP
 439     OSSL_TRACE(INIT, "OPENSSL_cleanup: OSSL_CMP_log_close()\n");
 440     OSSL_CMP_log_close();
 441 #endif
 442
 443     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
 444     ossl_trace_cleanup();
 445
 446     base_inited = 0;
 447 }
 448
 449 /*
 450  * If this function is called with a non NULL settings value then it must be
 451  * called prior to any threads making calls to any OpenSSL functions,
 452  * i.e. passing a non-null settings value is assumed to be single-threaded.
 453  */
 454 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 455 {
 456     /*
 457      * TODO(3.0): This function needs looking at with a view to moving most/all
 458      * of this into OPENSSL_CTX.
 459      */
 460
 461     if (stopped) {
 462         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 463             CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
 464         return 0;
 465     }
 466
 467     /*
 468      * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
 469      * *only* option specified.  With that option we return immediately after
 470      * doing the requested limited initialization.  Note that
 471      * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
 472      * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
 473      * base already initialized this is a harmless NOOP.
 474      *
 475      * If we remain the only caller of err_shelve_state() the recursion should
 476      * perhaps be removed, but if in doubt, it can be left in place.
 477      */
 478     if (!RUN_ONCE(&base, ossl_init_base))
 479         return 0;
 480
 481     if (opts & OPENSSL_INIT_BASE_ONLY)
 482         return 1;
 483
 484     /*
 485      * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
 486      * should not have the side-effect of setting up exit handlers, and
 487      * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
 488      * return above.
 489      */
 490     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 491         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 492                           ossl_init_register_atexit))
 493             return 0;
 494     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 495         return 0;
 496     }
 497
 498     if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
 499         return 0;
 500
 501     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 502             && !RUN_ONCE_ALT(&load_crypto_strings,
 503                              ossl_init_no_load_crypto_strings,
 504                              ossl_init_load_crypto_strings))
 505         return 0;
 506
 507     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 508             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 509         return 0;
 510
 511     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 512             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 513                              ossl_init_add_all_ciphers))
 514         return 0;
 515
 516     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 517             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 518         return 0;
 519
 520     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 521             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 522                              ossl_init_add_all_digests))
 523         return 0;
 524
 525     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 526             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 527         return 0;
 528
 529     if ((opts & OPENSSL_INIT_ATFORK)
 530             && !openssl_init_fork_handlers())
 531         return 0;
 532
 533     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 534             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 535         return 0;
 536
 537     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 538         int ret;
 539         CRYPTO_THREAD_write_lock(init_lock);
 540         conf_settings = settings;
 541         ret = RUN_ONCE(&config, ossl_init_config);
 542         conf_settings = NULL;
 543         CRYPTO_THREAD_unlock(init_lock);
 544         if (ret <= 0)
 545             return 0;
 546     }
 547
 548     if ((opts & OPENSSL_INIT_ASYNC)
 549             && !RUN_ONCE(&async, ossl_init_async))
 550         return 0;
 551
 552 #ifndef OPENSSL_NO_ENGINE
 553     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 554             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 555         return 0;
 556 # ifndef OPENSSL_NO_RDRAND
 557     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 558             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 559         return 0;
 560 # endif
 561     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 562             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 563         return 0;
 564 # ifndef OPENSSL_NO_STATIC_ENGINE
 565 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 566     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 567             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 568         return 0;
 569 #  endif
 570 #  if !defined(OPENSSL_NO_PADLOCKENG)
 571     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 572             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 573         return 0;
 574 #  endif
 575 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 576     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 577             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 578         return 0;
 579 #  endif
 580 #  if !defined(OPENSSL_NO_AFALGENG)
 581     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 582             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 583         return 0;
 584 #  endif
 585 # endif
 586     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 587                 | OPENSSL_INIT_ENGINE_OPENSSL
 588                 | OPENSSL_INIT_ENGINE_AFALG)) {
 589         ENGINE_register_all_complete();
 590     }
 591 #endif
 592
 593 #ifndef OPENSSL_NO_COMP
 594     if ((opts & OPENSSL_INIT_ZLIB)
 595             && !RUN_ONCE(&zlib, ossl_init_zlib))
 596         return 0;
 597 #endif
 598
 599     return 1;
 600 }
 601
 602 int OPENSSL_atexit(void (*handler)(void))
 603 {
 604     OPENSSL_INIT_STOP *newhand;
 605
 606 #if !defined(OPENSSL_USE_NODELETE)\
 607     && !defined(OPENSSL_NO_PINSHARED)
 608     {
 609         union {
 610             void *sym;
 611             void (*func)(void);
 612         } handlersym;
 613
 614         handlersym.func = handler;
 615 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 616         {
 617             HMODULE handle = NULL;
 618             BOOL ret;
 619
 620             /*
 621              * We don't use the DSO route for WIN32 because there is a better
 622              * way
 623              */
 624             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 625                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 626                                     handlersym.sym, &handle);
 627
 628             if (!ret)
 629                 return 0;
 630         }
 631 # elif !defined(DSO_NONE)
 632         /*
 633          * Deliberately leak a reference to the handler. This will force the
 634          * library/code containing the handler to remain loaded until we run the
 635          * atexit handler. If -znodelete has been used then this is
 636          * unnecessary.
 637          */
 638         {
 639             DSO *dso = NULL;
 640
 641             ERR_set_mark();
 642             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 643             /* See same code above in ossl_init_base() for an explanation. */
 644             OSSL_TRACE1(INIT,
 645                        "atexit: obtained DSO reference? %s\n",
 646                        (dso == NULL ? "No!" : "Yes."));
 647             DSO_free(dso);
 648             ERR_pop_to_mark();
 649         }
 650 # endif
 651     }
 652 #endif
 653
 654     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
 655         CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
 656         return 0;
 657     }
 658
 659     newhand->handler = handler;
 660     newhand->next = stop_handlers;
 661     stop_handlers = newhand;
 662
 663     return 1;
 664 }
 665
 666 #ifdef OPENSSL_SYS_UNIX
 667 /*
 668  * The following three functions are for OpenSSL developers.  This is
 669  * where we set/reset state across fork (called via pthread_atfork when
 670  * it exists, or manually by the application when it doesn't).
 671  *
 672  * WARNING!  If you put code in either OPENSSL_fork_parent or
 673  * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
 674  * safe.  See this link, for example:
 675  *      http://man7.org/linux/man-pages/man7/signal-safety.7.html
 676  */
 677
 678 void OPENSSL_fork_prepare(void)
 679 {
 680 }
 681
 682 void OPENSSL_fork_parent(void)
 683 {
 684 }
 685
 686 void OPENSSL_fork_child(void)
 687 {
 688     /* TODO(3.0): Inform all providers about a fork event */
 689 }
 690 #endif