crypto/init.c

   1 /*
   2  * Copyright 2016-2021 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 static uint64_t optsdone = 0;
  38
  39 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  40 struct ossl_init_stop_st {
  41     void (*handler)(void);
  42     OPENSSL_INIT_STOP *next;
  43 };
  44
  45 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  46 static CRYPTO_RWLOCK *init_lock = NULL;
  47 static CRYPTO_THREAD_LOCAL in_init_config_local;
  48
  49 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  50 static int base_inited = 0;
  51 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  52 {
  53     /* no need to init trace */
  54
  55     OSSL_TRACE(INIT, "ossl_init_base: setting up stop handlers\n");
  56 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  57     ossl_malloc_setup_failures();
  58 #endif
  59
  60     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  61         goto err;
  62     OPENSSL_cpuid_setup();
  63
  64     if (!ossl_init_thread())
  65         goto err;
  66
  67     if (!CRYPTO_THREAD_init_local(&in_init_config_local, NULL))
  68         goto err;
  69
  70     base_inited = 1;
  71     return 1;
  72
  73 err:
  74     OSSL_TRACE(INIT, "ossl_init_base failed!\n");
  75     CRYPTO_THREAD_lock_free(init_lock);
  76     init_lock = NULL;
  77
  78     return 0;
  79 }
  80
  81 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
  82 #if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
  83 static int win32atexit(void)
  84 {
  85     OPENSSL_cleanup();
  86     return 0;
  87 }
  88 #endif
  89
  90 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
  91 {
  92 #ifdef OPENSSL_INIT_DEBUG
  93     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
  94 #endif
  95 #ifndef OPENSSL_SYS_UEFI
  96 # if defined(_WIN32) && !defined(__BORLANDC__)
  97     /* We use _onexit() in preference because it gets called on DLL unload */
  98     if (_onexit(win32atexit) == NULL)
  99         return 0;
 100 # else
 101     if (atexit(OPENSSL_cleanup) != 0)
 102         return 0;
 103 # endif
 104 #endif
 105
 106     return 1;
 107 }
 108
 109 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 110                            ossl_init_register_atexit)
 111 {
 112 #ifdef OPENSSL_INIT_DEBUG
 113     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 114 #endif
 115     /* Do nothing in this case */
 116     return 1;
 117 }
 118
 119 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 120 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 121 {
 122     OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
 123
 124 #if !defined(OPENSSL_USE_NODELETE) \
 125     && !defined(OPENSSL_NO_PINSHARED)
 126 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 127     {
 128         HMODULE handle = NULL;
 129         BOOL ret;
 130
 131         /* We don't use the DSO route for WIN32 because there is a better way */
 132         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 133                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 134                                 (void *)&base_inited, &handle);
 135
 136         OSSL_TRACE1(INIT,
 137                     "ossl_init_load_crypto_nodelete: "
 138                     "obtained DSO reference? %s\n",
 139                     (ret == TRUE ? "No!" : "Yes."));
 140         return (ret == TRUE) ? 1 : 0;
 141     }
 142 # elif !defined(DSO_NONE)
 143     /*
 144      * Deliberately leak a reference to ourselves. This will force the library
 145      * to remain loaded until the atexit() handler is run at process exit.
 146      */
 147     {
 148         DSO *dso;
 149         void *err;
 150
 151         if (!err_shelve_state(&err))
 152             return 0;
 153
 154         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 155         /*
 156          * In case of No!, it is uncertain our exit()-handlers can still be
 157          * called. After dlclose() the whole library might have been unloaded
 158          * already.
 159          */
 160         OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
 161                     (dso == NULL ? "No!" : "Yes."));
 162         DSO_free(dso);
 163         err_unshelve_state(err);
 164     }
 165 # endif
 166 #endif
 167
 168     return 1;
 169 }
 170
 171 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 172 static int load_crypto_strings_inited = 0;
 173 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 174 {
 175     int ret = 1;
 176     /*
 177      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 178      * pulling in all the error strings during static linking
 179      */
 180 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 181     OSSL_TRACE(INIT, "ossl_err_load_crypto_strings()\n");
 182     ret = ossl_err_load_crypto_strings();
 183     load_crypto_strings_inited = 1;
 184 #endif
 185     return ret;
 186 }
 187
 188 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 189                            ossl_init_load_crypto_strings)
 190 {
 191     /* Do nothing in this case */
 192     return 1;
 193 }
 194
 195 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 196 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 197 {
 198     /*
 199      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 200      * pulling in all the ciphers during static linking
 201      */
 202 #ifndef OPENSSL_NO_AUTOALGINIT
 203     OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
 204     openssl_add_all_ciphers_int();
 205 #endif
 206     return 1;
 207 }
 208
 209 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 210                            ossl_init_add_all_ciphers)
 211 {
 212     /* Do nothing */
 213     return 1;
 214 }
 215
 216 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 217 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 218 {
 219     /*
 220      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 221      * pulling in all the ciphers during static linking
 222      */
 223 #ifndef OPENSSL_NO_AUTOALGINIT
 224     OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
 225     openssl_add_all_digests_int();
 226 #endif
 227     return 1;
 228 }
 229
 230 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 231                            ossl_init_add_all_digests)
 232 {
 233     /* Do nothing */
 234     return 1;
 235 }
 236
 237 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 238 static int config_inited = 0;
 239 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
 240 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 241 {
 242     int ret = ossl_config_int(NULL);
 243
 244     config_inited = 1;
 245     return ret;
 246 }
 247 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_config_settings, ossl_init_config)
 248 {
 249     int ret = ossl_config_int(conf_settings);
 250
 251     config_inited = 1;
 252     return ret;
 253 }
 254 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 255 {
 256     OSSL_TRACE(INIT, "ossl_no_config_int()\n");
 257     ossl_no_config_int();
 258     config_inited = 1;
 259     return 1;
 260 }
 261
 262 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 263 static int async_inited = 0;
 264 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 265 {
 266     OSSL_TRACE(INIT, "async_init()\n");
 267     if (!async_init())
 268         return 0;
 269     async_inited = 1;
 270     return 1;
 271 }
 272
 273 #ifndef OPENSSL_NO_ENGINE
 274 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 275 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 276 {
 277     OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
 278     engine_load_openssl_int();
 279     return 1;
 280 }
 281 # ifndef OPENSSL_NO_RDRAND
 282 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 283 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 284 {
 285     OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
 286     engine_load_rdrand_int();
 287     return 1;
 288 }
 289 # endif
 290 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 291 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 292 {
 293     OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
 294     engine_load_dynamic_int();
 295     return 1;
 296 }
 297 # ifndef OPENSSL_NO_STATIC_ENGINE
 298 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 299 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 300 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 301 {
 302     OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
 303     engine_load_devcrypto_int();
 304     return 1;
 305 }
 306 #  endif
 307 #  if !defined(OPENSSL_NO_PADLOCKENG)
 308 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 309 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 310 {
 311     OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
 312     engine_load_padlock_int();
 313     return 1;
 314 }
 315 #  endif
 316 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 317 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 318 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 319 {
 320     OSSL_TRACE(INIT, "engine_load_capi_int()\n");
 321     engine_load_capi_int();
 322     return 1;
 323 }
 324 #  endif
 325 #  if !defined(OPENSSL_NO_AFALGENG)
 326 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 327 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 328 {
 329     OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
 330     engine_load_afalg_int();
 331     return 1;
 332 }
 333 #  endif
 334 # endif
 335 #endif
 336
 337 void OPENSSL_cleanup(void)
 338 {
 339     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 340
 341     /*
 342      * At some point we should consider looking at this function with a view to
 343      * moving most/all of this into onfree handlers in OSSL_LIB_CTX.
 344      */
 345
 346     /* If we've not been inited then no need to deinit */
 347     if (!base_inited)
 348         return;
 349
 350     /* Might be explicitly called and also by atexit */
 351     if (stopped)
 352         return;
 353     stopped = 1;
 354
 355     /*
 356      * Thread stop may not get automatically called by the thread library for
 357      * the very last thread in some situations, so call it directly.
 358      */
 359     OPENSSL_thread_stop();
 360
 361     currhandler = stop_handlers;
 362     while (currhandler != NULL) {
 363         currhandler->handler();
 364         lasthandler = currhandler;
 365         currhandler = currhandler->next;
 366         OPENSSL_free(lasthandler);
 367     }
 368     stop_handlers = NULL;
 369
 370     CRYPTO_THREAD_lock_free(init_lock);
 371     init_lock = NULL;
 372
 373     CRYPTO_THREAD_cleanup_local(&in_init_config_local);
 374
 375     /*
 376      * We assume we are single-threaded for this function, i.e. no race
 377      * conditions for the various "*_inited" vars below.
 378      */
 379
 380 #ifndef OPENSSL_NO_COMP
 381     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_comp_zlib_cleanup()\n");
 382     ossl_comp_zlib_cleanup();
 383 #endif
 384
 385     if (async_inited) {
 386         OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
 387         async_deinit();
 388     }
 389
 390     if (load_crypto_strings_inited) {
 391         OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
 392         err_free_strings_int();
 393     }
 394
 395     /*
 396      * Note that cleanup order is important:
 397      * - ossl_rand_cleanup_int could call an ENGINE's RAND cleanup function so
 398      * must be called before engine_cleanup_int()
 399      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 400      * before the ex data handlers are wiped during default ossl_lib_ctx deinit.
 401      * - ossl_config_modules_free() can end up in ENGINE code so must be called
 402      * before engine_cleanup_int()
 403      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 404      * ossl_obj_cleanup_int() must be called last
 405      */
 406     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_rand_cleanup_int()\n");
 407     ossl_rand_cleanup_int();
 408
 409     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_config_modules_free()\n");
 410     ossl_config_modules_free();
 411
 412 #ifndef OPENSSL_NO_ENGINE
 413     OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
 414     engine_cleanup_int();
 415 #endif
 416
 417 #ifndef OPENSSL_NO_DEPRECATED_3_0
 418     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
 419     ossl_store_cleanup_int();
 420 #endif
 421
 422     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_lib_ctx_default_deinit()\n");
 423     ossl_lib_ctx_default_deinit();
 424
 425     ossl_cleanup_thread();
 426
 427     OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
 428     bio_cleanup();
 429
 430     OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
 431     evp_cleanup_int();
 432
 433     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_obj_cleanup_int()\n");
 434     ossl_obj_cleanup_int();
 435
 436     OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
 437     err_cleanup();
 438
 439     OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
 440     CRYPTO_secure_malloc_done();
 441
 442 #ifndef OPENSSL_NO_CMP
 443     OSSL_TRACE(INIT, "OPENSSL_cleanup: OSSL_CMP_log_close()\n");
 444     OSSL_CMP_log_close();
 445 #endif
 446
 447     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
 448     ossl_trace_cleanup();
 449
 450     base_inited = 0;
 451 }
 452
 453 /*
 454  * If this function is called with a non NULL settings value then it must be
 455  * called prior to any threads making calls to any OpenSSL functions,
 456  * i.e. passing a non-null settings value is assumed to be single-threaded.
 457  */
 458 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 459 {
 460     uint64_t tmp;
 461     int aloaddone = 0;
 462
 463    /* Applications depend on 0 being returned when cleanup was already done */
 464     if (stopped) {
 465         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 466             ERR_raise(ERR_LIB_CRYPTO, ERR_R_INIT_FAIL);
 467         return 0;
 468     }
 469
 470     /*
 471      * We ignore failures from this function. It is probably because we are
 472      * on a platform that doesn't support lockless atomic loads (we may not
 473      * have created init_lock yet so we can't use it). This is just an
 474      * optimisation to skip the full checks in this function if we don't need
 475      * to, so we carry on regardless in the event of failure.
 476      *
 477      * There could be a race here with other threads, so that optsdone has not
 478      * been updated yet, even though the options have in fact been initialised.
 479      * This doesn't matter - it just means we will run the full function
 480      * unnecessarily - but all the critical code is contained in RUN_ONCE
 481      * functions anyway so we are safe.
 482      */
 483     if (CRYPTO_atomic_load(&optsdone, &tmp, NULL)) {
 484         if ((tmp & opts) == opts)
 485             return 1;
 486         aloaddone = 1;
 487     }
 488
 489     /*
 490      * At some point we should look at this function with a view to moving
 491      * most/all of this into OSSL_LIB_CTX.
 492      *
 493      * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
 494      * *only* option specified.  With that option we return immediately after
 495      * doing the requested limited initialization.  Note that
 496      * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
 497      * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
 498      * base already initialized this is a harmless NOOP.
 499      *
 500      * If we remain the only caller of err_shelve_state() the recursion should
 501      * perhaps be removed, but if in doubt, it can be left in place.
 502      */
 503     if (!RUN_ONCE(&base, ossl_init_base))
 504         return 0;
 505
 506     if (opts & OPENSSL_INIT_BASE_ONLY)
 507         return 1;
 508
 509     /*
 510      * init_lock should definitely be set up now, so we can now repeat the
 511      * same check from above but be sure that it will work even on platforms
 512      * without lockless CRYPTO_atomic_load
 513      */
 514     if (!aloaddone) {
 515         if (!CRYPTO_atomic_load(&optsdone, &tmp, init_lock))
 516             return 0;
 517         if ((tmp & opts) == opts)
 518             return 1;
 519     }
 520
 521     /*
 522      * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
 523      * should not have the side-effect of setting up exit handlers, and
 524      * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
 525      * return above.
 526      */
 527     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 528         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 529                           ossl_init_register_atexit))
 530             return 0;
 531     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 532         return 0;
 533     }
 534
 535     if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
 536         return 0;
 537
 538     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 539             && !RUN_ONCE_ALT(&load_crypto_strings,
 540                              ossl_init_no_load_crypto_strings,
 541                              ossl_init_load_crypto_strings))
 542         return 0;
 543
 544     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 545             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 546         return 0;
 547
 548     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 549             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 550                              ossl_init_add_all_ciphers))
 551         return 0;
 552
 553     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 554             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 555         return 0;
 556
 557     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 558             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 559                              ossl_init_add_all_digests))
 560         return 0;
 561
 562     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 563             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 564         return 0;
 565
 566     if ((opts & OPENSSL_INIT_ATFORK)
 567             && !openssl_init_fork_handlers())
 568         return 0;
 569
 570     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 571             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 572         return 0;
 573
 574     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 575         int loading = CRYPTO_THREAD_get_local(&in_init_config_local) != NULL;
 576
 577         /* If called recursively from OBJ_ calls, just skip it. */
 578         if (!loading) {
 579             int ret;
 580
 581             if (!CRYPTO_THREAD_set_local(&in_init_config_local, (void *)-1))
 582                 return 0;
 583             if (settings == NULL) {
 584                 ret = RUN_ONCE(&config, ossl_init_config);
 585             } else {
 586                 if (!CRYPTO_THREAD_write_lock(init_lock))
 587                     return 0;
 588                 conf_settings = settings;
 589                 ret = RUN_ONCE_ALT(&config, ossl_init_config_settings,
 590                                    ossl_init_config);
 591                 conf_settings = NULL;
 592                 CRYPTO_THREAD_unlock(init_lock);
 593             }
 594
 595             if (ret <= 0)
 596                 return 0;
 597         }
 598     }
 599
 600     if ((opts & OPENSSL_INIT_ASYNC)
 601             && !RUN_ONCE(&async, ossl_init_async))
 602         return 0;
 603
 604 #ifndef OPENSSL_NO_ENGINE
 605     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 606             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 607         return 0;
 608 # ifndef OPENSSL_NO_RDRAND
 609     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 610             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 611         return 0;
 612 # endif
 613     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 614             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 615         return 0;
 616 # ifndef OPENSSL_NO_STATIC_ENGINE
 617 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 618     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 619             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 620         return 0;
 621 #  endif
 622 #  if !defined(OPENSSL_NO_PADLOCKENG)
 623     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 624             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 625         return 0;
 626 #  endif
 627 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 628     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 629             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 630         return 0;
 631 #  endif
 632 #  if !defined(OPENSSL_NO_AFALGENG)
 633     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 634             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 635         return 0;
 636 #  endif
 637 # endif
 638     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 639                 | OPENSSL_INIT_ENGINE_OPENSSL
 640                 | OPENSSL_INIT_ENGINE_AFALG)) {
 641         ENGINE_register_all_complete();
 642     }
 643 #endif
 644
 645     if (!CRYPTO_atomic_or(&optsdone, opts, &tmp, init_lock))
 646         return 0;
 647
 648     return 1;
 649 }
 650
 651 int OPENSSL_atexit(void (*handler)(void))
 652 {
 653     OPENSSL_INIT_STOP *newhand;
 654
 655 #if !defined(OPENSSL_USE_NODELETE)\
 656     && !defined(OPENSSL_NO_PINSHARED)
 657     {
 658         union {
 659             void *sym;
 660             void (*func)(void);
 661         } handlersym;
 662
 663         handlersym.func = handler;
 664 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 665         {
 666             HMODULE handle = NULL;
 667             BOOL ret;
 668
 669             /*
 670              * We don't use the DSO route for WIN32 because there is a better
 671              * way
 672              */
 673             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 674                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 675                                     handlersym.sym, &handle);
 676
 677             if (!ret)
 678                 return 0;
 679         }
 680 # elif !defined(DSO_NONE)
 681         /*
 682          * Deliberately leak a reference to the handler. This will force the
 683          * library/code containing the handler to remain loaded until we run the
 684          * atexit handler. If -znodelete has been used then this is
 685          * unnecessary.
 686          */
 687         {
 688             DSO *dso = NULL;
 689
 690             ERR_set_mark();
 691             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 692             /* See same code above in ossl_init_base() for an explanation. */
 693             OSSL_TRACE1(INIT,
 694                        "atexit: obtained DSO reference? %s\n",
 695                        (dso == NULL ? "No!" : "Yes."));
 696             DSO_free(dso);
 697             ERR_pop_to_mark();
 698         }
 699 # endif
 700     }
 701 #endif
 702
 703     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
 704         ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
 705         return 0;
 706     }
 707
 708     newhand->handler = handler;
 709     newhand->next = stop_handlers;
 710     stop_handlers = newhand;
 711
 712     return 1;
 713 }
 714