crypto/init.c

   1 /*
   2  * Copyright 2016-2018 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 #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_conf.h"
  28 #include "internal/dso.h"
  29 #include "internal/store.h"
  30 #include <openssl/trace.h>
  31
  32 static int stopped = 0;
  33
  34 /*
  35  * Since per-thread-specific-data destructors are not universally
  36  * available, i.e. not on Windows, only below CRYPTO_THREAD_LOCAL key
  37  * is assumed to have destructor associated. And then an effort is made
  38  * to call this single destructor on non-pthread platform[s].
  39  *
  40  * Initial value is "impossible". It is used as guard value to shortcut
  41  * destructor for threads terminating before libcrypto is initialized or
  42  * after it's de-initialized. Access to the key doesn't have to be
  43  * serialized for the said threads, because they didn't use libcrypto
  44  * and it doesn't matter if they pick "impossible" or derefernce real
  45  * key value and pull NULL past initialization in the first thread that
  46  * intends to use libcrypto.
  47  */
  48 static union {
  49     long sane;
  50     CRYPTO_THREAD_LOCAL value;
  51 } destructor_key = { -1 };
  52
  53 static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
  54
  55 static void ossl_init_thread_destructor(void *local)
  56 {
  57     ossl_init_thread_stop((struct thread_local_inits_st *)local);
  58 }
  59
  60 static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
  61 {
  62     struct thread_local_inits_st *local =
  63         CRYPTO_THREAD_get_local(&destructor_key.value);
  64
  65     if (alloc) {
  66         if (local == NULL
  67             && (local = OPENSSL_zalloc(sizeof(*local))) != NULL
  68             && !CRYPTO_THREAD_set_local(&destructor_key.value, local)) {
  69             OPENSSL_free(local);
  70             return NULL;
  71         }
  72     } else {
  73         CRYPTO_THREAD_set_local(&destructor_key.value, NULL);
  74     }
  75
  76     return local;
  77 }
  78
  79 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  80 struct ossl_init_stop_st {
  81     void (*handler)(void);
  82     OPENSSL_INIT_STOP *next;
  83 };
  84
  85 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  86 static CRYPTO_RWLOCK *init_lock = NULL;
  87
  88 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  89 static int base_inited = 0;
  90 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  91 {
  92     CRYPTO_THREAD_LOCAL key;
  93
  94     if (ossl_trace_init() == 0)
  95         return 0;
  96
  97     OSSL_TRACE(INIT, "ossl_init_base: setting up stop handlers\n");
  98 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  99     ossl_malloc_setup_failures();
 100 #endif
 101     if (!CRYPTO_THREAD_init_local(&key, ossl_init_thread_destructor))
 102         return 0;
 103     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
 104         goto err;
 105     OPENSSL_cpuid_setup();
 106
 107     destructor_key.value = key;
 108     base_inited = 1;
 109     return 1;
 110
 111 err:
 112     OSSL_TRACE(INIT, "ossl_init_base failed!\n");
 113     CRYPTO_THREAD_lock_free(init_lock);
 114     init_lock = NULL;
 115
 116     CRYPTO_THREAD_cleanup_local(&key);
 117     return 0;
 118 }
 119
 120 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
 121 #if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
 122 static int win32atexit(void)
 123 {
 124     OPENSSL_cleanup();
 125     return 0;
 126 }
 127 #endif
 128
 129 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
 130 {
 131 #ifdef OPENSSL_INIT_DEBUG
 132     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
 133 #endif
 134 #ifndef OPENSSL_SYS_UEFI
 135 # ifdef _WIN32
 136     /* We use _onexit() in preference because it gets called on DLL unload */
 137     if (_onexit(win32atexit) == NULL)
 138         return 0;
 139 # else
 140     if (atexit(OPENSSL_cleanup) != 0)
 141         return 0;
 142 # endif
 143 #endif
 144
 145     return 1;
 146 }
 147
 148 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 149                            ossl_init_register_atexit)
 150 {
 151 #ifdef OPENSSL_INIT_DEBUG
 152     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 153 #endif
 154     /* Do nothing in this case */
 155     return 1;
 156 }
 157
 158 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 159 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 160 {
 161     OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
 162
 163 #if !defined(OPENSSL_USE_NODELETE) \
 164     && !defined(OPENSSL_NO_PINSHARED)
 165 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 166     {
 167         HMODULE handle = NULL;
 168         BOOL ret;
 169
 170         /* We don't use the DSO route for WIN32 because there is a better way */
 171         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 172                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 173                                 (void *)&base_inited, &handle);
 174
 175         OSSL_TRACE1(INIT,
 176                     "ossl_init_load_crypto_nodelete: "
 177                     "obtained DSO reference? %s\n",
 178                     (ret == TRUE ? "No!" : "Yes."));
 179         return (ret == TRUE) ? 1 : 0;
 180     }
 181 # elif !defined(DSO_NONE)
 182     /*
 183      * Deliberately leak a reference to ourselves. This will force the library
 184      * to remain loaded until the atexit() handler is run at process exit.
 185      */
 186     {
 187         DSO *dso;
 188         void *err;
 189
 190         if (!err_shelve_state(&err))
 191             return 0;
 192
 193         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 194         /*
 195          * In case of No!, it is uncertain our exit()-handlers can still be
 196          * called. After dlclose() the whole library might have been unloaded
 197          * already.
 198          */
 199         OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
 200                     (dso == NULL ? "No!" : "Yes."));
 201         DSO_free(dso);
 202         err_unshelve_state(err);
 203     }
 204 # endif
 205 #endif
 206
 207     return 1;
 208 }
 209
 210 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 211 static int load_crypto_strings_inited = 0;
 212 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 213 {
 214     int ret = 1;
 215     /*
 216      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 217      * pulling in all the error strings during static linking
 218      */
 219 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 220     OSSL_TRACE(INIT, "err_load_crypto_strings_int()\n");
 221     ret = err_load_crypto_strings_int();
 222     load_crypto_strings_inited = 1;
 223 #endif
 224     return ret;
 225 }
 226
 227 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 228                            ossl_init_load_crypto_strings)
 229 {
 230     /* Do nothing in this case */
 231     return 1;
 232 }
 233
 234 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 235 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 236 {
 237     /*
 238      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 239      * pulling in all the ciphers during static linking
 240      */
 241 #ifndef OPENSSL_NO_AUTOALGINIT
 242     OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
 243     openssl_add_all_ciphers_int();
 244 #endif
 245     return 1;
 246 }
 247
 248 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 249                            ossl_init_add_all_ciphers)
 250 {
 251     /* Do nothing */
 252     return 1;
 253 }
 254
 255 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 256 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 257 {
 258     /*
 259      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 260      * pulling in all the ciphers during static linking
 261      */
 262 #ifndef OPENSSL_NO_AUTOALGINIT
 263     OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
 264     openssl_add_all_digests_int();
 265 #endif
 266     return 1;
 267 }
 268
 269 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 270                            ossl_init_add_all_digests)
 271 {
 272     /* Do nothing */
 273     return 1;
 274 }
 275
 276 static CRYPTO_ONCE add_all_macs = CRYPTO_ONCE_STATIC_INIT;
 277 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_macs)
 278 {
 279     /*
 280      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 281      * pulling in all the macs during static linking
 282      */
 283 #ifndef OPENSSL_NO_AUTOALGINIT
 284     OSSL_TRACE(INIT, "openssl_add_all_macs_int()\n");
 285     openssl_add_all_macs_int();
 286 #endif
 287     return 1;
 288 }
 289
 290 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_macs, ossl_init_add_all_macs)
 291 {
 292     /* Do nothing */
 293     return 1;
 294 }
 295
 296 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 297 static int config_inited = 0;
 298 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
 299 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 300 {
 301     int ret = openssl_config_int(conf_settings);
 302     config_inited = 1;
 303     return ret;
 304 }
 305 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 306 {
 307     OSSL_TRACE(INIT, "openssl_no_config_int()\n");
 308     openssl_no_config_int();
 309     config_inited = 1;
 310     return 1;
 311 }
 312
 313 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 314 static int async_inited = 0;
 315 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 316 {
 317     OSSL_TRACE(INIT, "async_init()\n");
 318     if (!async_init())
 319         return 0;
 320     async_inited = 1;
 321     return 1;
 322 }
 323
 324 #ifndef OPENSSL_NO_ENGINE
 325 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 326 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 327 {
 328     OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
 329     engine_load_openssl_int();
 330     return 1;
 331 }
 332 # ifndef OPENSSL_NO_RDRAND
 333 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 334 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 335 {
 336     OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
 337     engine_load_rdrand_int();
 338     return 1;
 339 }
 340 # endif
 341 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 342 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 343 {
 344     OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
 345     engine_load_dynamic_int();
 346     return 1;
 347 }
 348 # ifndef OPENSSL_NO_STATIC_ENGINE
 349 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 350 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 351 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 352 {
 353     OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
 354     engine_load_devcrypto_int();
 355     return 1;
 356 }
 357 #  endif
 358 #  if !defined(OPENSSL_NO_PADLOCKENG)
 359 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 360 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 361 {
 362     OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
 363     engine_load_padlock_int();
 364     return 1;
 365 }
 366 #  endif
 367 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 368 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 369 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 370 {
 371     OSSL_TRACE(INIT, "engine_load_capi_int()\n");
 372     engine_load_capi_int();
 373     return 1;
 374 }
 375 #  endif
 376 #  if !defined(OPENSSL_NO_AFALGENG)
 377 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 378 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 379 {
 380     OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
 381     engine_load_afalg_int();
 382     return 1;
 383 }
 384 #  endif
 385 # endif
 386 #endif
 387
 388 #ifndef OPENSSL_NO_COMP
 389 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 390
 391 static int zlib_inited = 0;
 392 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 393 {
 394     /* Do nothing - we need to know about this for the later cleanup */
 395     zlib_inited = 1;
 396     return 1;
 397 }
 398 #endif
 399
 400 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
 401 {
 402     /* Can't do much about this */
 403     if (locals == NULL)
 404         return;
 405
 406     if (locals->async) {
 407         OSSL_TRACE(INIT, "async_delete_thread_state()\n");
 408         async_delete_thread_state();
 409     }
 410
 411     if (locals->err_state) {
 412         OSSL_TRACE(INIT, "err_delete_thread_state()\n");
 413         err_delete_thread_state();
 414     }
 415
 416     if (locals->rand) {
 417         OSSL_TRACE(INIT, "drbg_delete_thread_state()\n");
 418         drbg_delete_thread_state();
 419     }
 420
 421     OPENSSL_free(locals);
 422 }
 423
 424 void OPENSSL_thread_stop(void)
 425 {
 426     if (destructor_key.sane != -1)
 427         ossl_init_thread_stop(ossl_init_get_thread_local(0));
 428 }
 429
 430 int ossl_init_thread_start(uint64_t opts)
 431 {
 432     struct thread_local_inits_st *locals;
 433
 434     if (!OPENSSL_init_crypto(0, NULL))
 435         return 0;
 436
 437     locals = ossl_init_get_thread_local(1);
 438
 439     if (locals == NULL)
 440         return 0;
 441
 442     if (opts & OPENSSL_INIT_THREAD_ASYNC) {
 443         OSSL_TRACE(INIT,
 444                    "ossl_init_thread_start: "
 445                    "marking thread for async\n");
 446         locals->async = 1;
 447     }
 448
 449     if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
 450         OSSL_TRACE(INIT,
 451                    "ossl_init_thread_start: "
 452                    "marking thread for err_state\n");
 453         locals->err_state = 1;
 454     }
 455
 456     if (opts & OPENSSL_INIT_THREAD_RAND) {
 457         OSSL_TRACE(INIT,
 458                    "ossl_init_thread_start: "
 459                    "marking thread for rand\n");
 460         locals->rand = 1;
 461     }
 462
 463     return 1;
 464 }
 465
 466 void OPENSSL_cleanup(void)
 467 {
 468     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 469     CRYPTO_THREAD_LOCAL key;
 470
 471     /* If we've not been inited then no need to deinit */
 472     if (!base_inited)
 473         return;
 474
 475     /* Might be explicitly called and also by atexit */
 476     if (stopped)
 477         return;
 478     stopped = 1;
 479
 480     /*
 481      * Thread stop may not get automatically called by the thread library for
 482      * the very last thread in some situations, so call it directly.
 483      */
 484     ossl_init_thread_stop(ossl_init_get_thread_local(0));
 485
 486     currhandler = stop_handlers;
 487     while (currhandler != NULL) {
 488         currhandler->handler();
 489         lasthandler = currhandler;
 490         currhandler = currhandler->next;
 491         OPENSSL_free(lasthandler);
 492     }
 493     stop_handlers = NULL;
 494
 495     CRYPTO_THREAD_lock_free(init_lock);
 496     init_lock = NULL;
 497
 498     /*
 499      * We assume we are single-threaded for this function, i.e. no race
 500      * conditions for the various "*_inited" vars below.
 501      */
 502
 503 #ifndef OPENSSL_NO_COMP
 504     if (zlib_inited) {
 505         OSSL_TRACE(INIT, "OPENSSL_cleanup: comp_zlib_cleanup_int()\n");
 506         comp_zlib_cleanup_int();
 507     }
 508 #endif
 509
 510     if (async_inited) {
 511         OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
 512         async_deinit();
 513     }
 514
 515     if (load_crypto_strings_inited) {
 516         OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
 517         err_free_strings_int();
 518     }
 519
 520     key = destructor_key.value;
 521     destructor_key.sane = -1;
 522     CRYPTO_THREAD_cleanup_local(&key);
 523
 524     /*
 525      * Note that cleanup order is important:
 526      * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
 527      * must be called before engine_cleanup_int()
 528      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 529      * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
 530      * - conf_modules_free_int() can end up in ENGINE code so must be called
 531      * before engine_cleanup_int()
 532      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 533      * obj_cleanup_int() must be called last
 534      */
 535     OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_cleanup_int()\n");
 536     rand_cleanup_int();
 537
 538     OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_drbg_cleanup_int()\n");
 539     rand_drbg_cleanup_int();
 540
 541     OSSL_TRACE(INIT, "OPENSSL_cleanup: conf_modules_free_int()\n");
 542     conf_modules_free_int();
 543 #ifndef OPENSSL_NO_ENGINE
 544     OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
 545     engine_cleanup_int();
 546 #endif
 547     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
 548     ossl_store_cleanup_int();
 549
 550     OSSL_TRACE(INIT, "OPENSSL_cleanup: crypto_cleanup_all_ex_data_int()\n");
 551     crypto_cleanup_all_ex_data_int();
 552
 553     OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
 554     bio_cleanup();
 555
 556     OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
 557     evp_cleanup_int();
 558
 559     OSSL_TRACE(INIT, "OPENSSL_cleanup: obj_cleanup_int()\n");
 560     obj_cleanup_int();
 561
 562     OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
 563     err_cleanup();
 564
 565     OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
 566     CRYPTO_secure_malloc_done();
 567
 568     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
 569     ossl_trace_cleanup();
 570
 571     base_inited = 0;
 572 }
 573
 574 /*
 575  * If this function is called with a non NULL settings value then it must be
 576  * called prior to any threads making calls to any OpenSSL functions,
 577  * i.e. passing a non-null settings value is assumed to be single-threaded.
 578  */
 579 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 580 {
 581     if (stopped) {
 582         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 583             CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
 584         return 0;
 585     }
 586
 587     /*
 588      * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
 589      * *only* option specified.  With that option we return immediately after
 590      * doing the requested limited initialization.  Note that
 591      * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
 592      * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
 593      * base already initialized this is a harmless NOOP.
 594      *
 595      * If we remain the only caller of err_shelve_state() the recursion should
 596      * perhaps be removed, but if in doubt, it can be left in place.
 597      */
 598     if (!RUN_ONCE(&base, ossl_init_base))
 599         return 0;
 600
 601     if (opts & OPENSSL_INIT_BASE_ONLY)
 602         return 1;
 603
 604     /*
 605      * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
 606      * should not have the side-effect of setting up exit handlers, and
 607      * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
 608      * return above.
 609      */
 610     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 611         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 612                           ossl_init_register_atexit))
 613             return 0;
 614     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 615         return 0;
 616     }
 617
 618     if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
 619         return 0;
 620
 621     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 622             && !RUN_ONCE_ALT(&load_crypto_strings,
 623                              ossl_init_no_load_crypto_strings,
 624                              ossl_init_load_crypto_strings))
 625         return 0;
 626
 627     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 628             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 629         return 0;
 630
 631     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 632             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 633                              ossl_init_add_all_ciphers))
 634         return 0;
 635
 636     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 637             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 638         return 0;
 639
 640     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 641             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 642                              ossl_init_add_all_digests))
 643         return 0;
 644
 645     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 646             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 647         return 0;
 648
 649     if ((opts & OPENSSL_INIT_NO_ADD_ALL_MACS)
 650             && !RUN_ONCE_ALT(&add_all_macs, ossl_init_no_add_all_macs,
 651                              ossl_init_add_all_macs))
 652         return 0;
 653
 654     if ((opts & OPENSSL_INIT_ADD_ALL_MACS)
 655             && !RUN_ONCE(&add_all_macs, ossl_init_add_all_macs))
 656         return 0;
 657
 658     if ((opts & OPENSSL_INIT_ATFORK)
 659             && !openssl_init_fork_handlers())
 660         return 0;
 661
 662     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 663             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 664         return 0;
 665
 666     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 667         int ret;
 668         CRYPTO_THREAD_write_lock(init_lock);
 669         conf_settings = settings;
 670         ret = RUN_ONCE(&config, ossl_init_config);
 671         conf_settings = NULL;
 672         CRYPTO_THREAD_unlock(init_lock);
 673         if (ret <= 0)
 674             return 0;
 675     }
 676
 677     if ((opts & OPENSSL_INIT_ASYNC)
 678             && !RUN_ONCE(&async, ossl_init_async))
 679         return 0;
 680
 681 #ifndef OPENSSL_NO_ENGINE
 682     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 683             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 684         return 0;
 685 # ifndef OPENSSL_NO_RDRAND
 686     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 687             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 688         return 0;
 689 # endif
 690     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 691             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 692         return 0;
 693 # ifndef OPENSSL_NO_STATIC_ENGINE
 694 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 695     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 696             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 697         return 0;
 698 #  endif
 699 #  if !defined(OPENSSL_NO_PADLOCKENG)
 700     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 701             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 702         return 0;
 703 #  endif
 704 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 705     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 706             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 707         return 0;
 708 #  endif
 709 #  if !defined(OPENSSL_NO_AFALGENG)
 710     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 711             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 712         return 0;
 713 #  endif
 714 # endif
 715     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 716                 | OPENSSL_INIT_ENGINE_OPENSSL
 717                 | OPENSSL_INIT_ENGINE_AFALG)) {
 718         ENGINE_register_all_complete();
 719     }
 720 #endif
 721
 722 #ifndef OPENSSL_NO_COMP
 723     if ((opts & OPENSSL_INIT_ZLIB)
 724             && !RUN_ONCE(&zlib, ossl_init_zlib))
 725         return 0;
 726 #endif
 727
 728     return 1;
 729 }
 730
 731 int OPENSSL_atexit(void (*handler)(void))
 732 {
 733     OPENSSL_INIT_STOP *newhand;
 734
 735 #if !defined(OPENSSL_USE_NODELETE)\
 736     && !defined(OPENSSL_NO_PINSHARED)
 737     {
 738         union {
 739             void *sym;
 740             void (*func)(void);
 741         } handlersym;
 742
 743         handlersym.func = handler;
 744 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 745         {
 746             HMODULE handle = NULL;
 747             BOOL ret;
 748
 749             /*
 750              * We don't use the DSO route for WIN32 because there is a better
 751              * way
 752              */
 753             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 754                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 755                                     handlersym.sym, &handle);
 756
 757             if (!ret)
 758                 return 0;
 759         }
 760 # elif !defined(DSO_NONE)
 761         /*
 762          * Deliberately leak a reference to the handler. This will force the
 763          * library/code containing the handler to remain loaded until we run the
 764          * atexit handler. If -znodelete has been used then this is
 765          * unnecessary.
 766          */
 767         {
 768             DSO *dso = NULL;
 769
 770             ERR_set_mark();
 771             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 772             /* See same code above in ossl_init_base() for an explanation. */
 773             OSSL_TRACE1(INIT,
 774                        "atexit: obtained DSO reference? %s\n",
 775                        (dso == NULL ? "No!" : "Yes."));
 776             DSO_free(dso);
 777             ERR_pop_to_mark();
 778         }
 779 # endif
 780     }
 781 #endif
 782
 783     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
 784         CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
 785         return 0;
 786     }
 787
 788     newhand->handler = handler;
 789     newhand->next = stop_handlers;
 790     stop_handlers = newhand;
 791
 792     return 1;
 793 }
 794
 795 #ifdef OPENSSL_SYS_UNIX
 796 /*
 797  * The following three functions are for OpenSSL developers.  This is
 798  * where we set/reset state across fork (called via pthread_atfork when
 799  * it exists, or manually by the application when it doesn't).
 800  *
 801  * WARNING!  If you put code in either OPENSSL_fork_parent or
 802  * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
 803  * safe.  See this link, for example:
 804  *      http://man7.org/linux/man-pages/man7/signal-safety.7.html
 805  */
 806
 807 void OPENSSL_fork_prepare(void)
 808 {
 809 }
 810
 811 void OPENSSL_fork_parent(void)
 812 {
 813 }
 814
 815 void OPENSSL_fork_child(void)
 816 {
 817     rand_fork();
 818 }
 819 #endif