crypto/init.c

   1 /*
   2  * Copyright 2016-2022 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 "internal/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 #include "crypto/ctype.h"
  36
  37 static int stopped = 0;
  38 static uint64_t optsdone = 0;
  39
  40 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  41 struct ossl_init_stop_st {
  42     void (*handler)(void);
  43     OPENSSL_INIT_STOP *next;
  44 };
  45
  46 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  47 /* Guards access to the optsdone variable on platforms without atomics */
  48 static CRYPTO_RWLOCK *optsdone_lock = NULL;
  49 /* Guards simultaneous INIT_LOAD_CONFIG calls with non-NULL settings */
  50 static CRYPTO_RWLOCK *init_lock = NULL;
  51 static CRYPTO_THREAD_LOCAL in_init_config_local;
  52
  53 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  54 static int base_inited = 0;
  55 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  56 {
  57     /* no need to init trace */
  58
  59     OSSL_TRACE(INIT, "ossl_init_base: setting up stop handlers\n");
  60 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  61     ossl_malloc_setup_failures();
  62 #endif
  63
  64     if ((optsdone_lock = CRYPTO_THREAD_lock_new()) == NULL
  65         || (init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  66         goto err;
  67
  68     OPENSSL_cpuid_setup();
  69
  70     if (!ossl_init_thread())
  71         goto err;
  72
  73     if (!CRYPTO_THREAD_init_local(&in_init_config_local, NULL))
  74         goto err;
  75
  76     base_inited = 1;
  77     return 1;
  78
  79 err:
  80     OSSL_TRACE(INIT, "ossl_init_base failed!\n");
  81     CRYPTO_THREAD_lock_free(optsdone_lock);
  82     optsdone_lock = NULL;
  83     CRYPTO_THREAD_lock_free(init_lock);
  84     init_lock = NULL;
  85
  86     return 0;
  87 }
  88
  89 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
  90 #if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
  91 static int win32atexit(void)
  92 {
  93     OPENSSL_cleanup();
  94     return 0;
  95 }
  96 #endif
  97
  98 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
  99 {
 100 #ifdef OPENSSL_INIT_DEBUG
 101     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
 102 #endif
 103 #ifndef OPENSSL_SYS_UEFI
 104 # if defined(_WIN32) && !defined(__BORLANDC__)
 105     /* We use _onexit() in preference because it gets called on DLL unload */
 106     if (_onexit(win32atexit) == NULL)
 107         return 0;
 108 # else
 109     if (atexit(OPENSSL_cleanup) != 0)
 110         return 0;
 111 # endif
 112 #endif
 113
 114     return 1;
 115 }
 116
 117 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 118                            ossl_init_register_atexit)
 119 {
 120 #ifdef OPENSSL_INIT_DEBUG
 121     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 122 #endif
 123     /* Do nothing in this case */
 124     return 1;
 125 }
 126
 127 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 128 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 129 {
 130     OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
 131
 132 #if !defined(OPENSSL_USE_NODELETE) \
 133     && !defined(OPENSSL_NO_PINSHARED)
 134 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 135     {
 136         HMODULE handle = NULL;
 137         BOOL ret;
 138
 139         /* We don't use the DSO route for WIN32 because there is a better way */
 140         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 141                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 142                                 (void *)&base_inited, &handle);
 143
 144         OSSL_TRACE1(INIT,
 145                     "ossl_init_load_crypto_nodelete: "
 146                     "obtained DSO reference? %s\n",
 147                     (ret == TRUE ? "No!" : "Yes."));
 148         return (ret == TRUE) ? 1 : 0;
 149     }
 150 # elif !defined(DSO_NONE)
 151     /*
 152      * Deliberately leak a reference to ourselves. This will force the library
 153      * to remain loaded until the atexit() handler is run at process exit.
 154      */
 155     {
 156         DSO *dso;
 157         void *err;
 158
 159         if (!err_shelve_state(&err))
 160             return 0;
 161
 162         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 163         /*
 164          * In case of No!, it is uncertain our exit()-handlers can still be
 165          * called. After dlclose() the whole library might have been unloaded
 166          * already.
 167          */
 168         OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
 169                     (dso == NULL ? "No!" : "Yes."));
 170         DSO_free(dso);
 171         err_unshelve_state(err);
 172     }
 173 # endif
 174 #endif
 175
 176     return 1;
 177 }
 178
 179 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 180
 181 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 182 {
 183     int ret = 1;
 184     /*
 185      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 186      * pulling in all the error strings during static linking
 187      */
 188 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 189     OSSL_TRACE(INIT, "ossl_err_load_crypto_strings()\n");
 190     ret = ossl_err_load_crypto_strings();
 191 #endif
 192     return ret;
 193 }
 194
 195 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 196                            ossl_init_load_crypto_strings)
 197 {
 198     /* Do nothing in this case */
 199     return 1;
 200 }
 201
 202 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 203 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 204 {
 205     /*
 206      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 207      * pulling in all the ciphers during static linking
 208      */
 209 #ifndef OPENSSL_NO_AUTOALGINIT
 210     OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
 211     openssl_add_all_ciphers_int();
 212 #endif
 213     return 1;
 214 }
 215
 216 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 217                            ossl_init_add_all_ciphers)
 218 {
 219     /* Do nothing */
 220     return 1;
 221 }
 222
 223 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 224 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 225 {
 226     /*
 227      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 228      * pulling in all the ciphers during static linking
 229      */
 230 #ifndef OPENSSL_NO_AUTOALGINIT
 231     OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
 232     openssl_add_all_digests_int();
 233 #endif
 234     return 1;
 235 }
 236
 237 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 238                            ossl_init_add_all_digests)
 239 {
 240     /* Do nothing */
 241     return 1;
 242 }
 243
 244 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 245 static int config_inited = 0;
 246 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
 247 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 248 {
 249     int ret = ossl_config_int(NULL);
 250
 251     config_inited = 1;
 252     return ret;
 253 }
 254 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_config_settings, ossl_init_config)
 255 {
 256     int ret = ossl_config_int(conf_settings);
 257
 258     config_inited = 1;
 259     return ret;
 260 }
 261 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 262 {
 263     OSSL_TRACE(INIT, "ossl_no_config_int()\n");
 264     ossl_no_config_int();
 265     config_inited = 1;
 266     return 1;
 267 }
 268
 269 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 270 static int async_inited = 0;
 271 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 272 {
 273     OSSL_TRACE(INIT, "async_init()\n");
 274     if (!async_init())
 275         return 0;
 276     async_inited = 1;
 277     return 1;
 278 }
 279
 280 #ifndef OPENSSL_NO_ENGINE
 281 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 282 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 283 {
 284     OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
 285     engine_load_openssl_int();
 286     return 1;
 287 }
 288 # ifndef OPENSSL_NO_RDRAND
 289 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 290 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 291 {
 292     OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
 293     engine_load_rdrand_int();
 294     return 1;
 295 }
 296 # endif
 297 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 298 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 299 {
 300     OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
 301     engine_load_dynamic_int();
 302     return 1;
 303 }
 304 # ifndef OPENSSL_NO_STATIC_ENGINE
 305 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 306 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 307 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 308 {
 309     OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
 310     engine_load_devcrypto_int();
 311     return 1;
 312 }
 313 #  endif
 314 #  if !defined(OPENSSL_NO_PADLOCKENG)
 315 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 316 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 317 {
 318     OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
 319     engine_load_padlock_int();
 320     return 1;
 321 }
 322 #  endif
 323 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 324 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 325 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 326 {
 327     OSSL_TRACE(INIT, "engine_load_capi_int()\n");
 328     engine_load_capi_int();
 329     return 1;
 330 }
 331 #  endif
 332 #  if !defined(OPENSSL_NO_AFALGENG)
 333 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 334 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 335 {
 336     OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
 337     engine_load_afalg_int();
 338     return 1;
 339 }
 340 #  endif
 341 # endif
 342 #endif
 343
 344 void OPENSSL_cleanup(void)
 345 {
 346     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 347
 348     /*
 349      * At some point we should consider looking at this function with a view to
 350      * moving most/all of this into onfree handlers in OSSL_LIB_CTX.
 351      */
 352
 353     /* If we've not been inited then no need to deinit */
 354     if (!base_inited)
 355         return;
 356
 357     /* Might be explicitly called and also by atexit */
 358     if (stopped)
 359         return;
 360     stopped = 1;
 361
 362     /*
 363      * Thread stop may not get automatically called by the thread library for
 364      * the very last thread in some situations, so call it directly.
 365      */
 366     OPENSSL_thread_stop();
 367
 368     currhandler = stop_handlers;
 369     while (currhandler != NULL) {
 370         currhandler->handler();
 371         lasthandler = currhandler;
 372         currhandler = currhandler->next;
 373         OPENSSL_free(lasthandler);
 374     }
 375     stop_handlers = NULL;
 376
 377     CRYPTO_THREAD_lock_free(optsdone_lock);
 378     optsdone_lock = NULL;
 379     CRYPTO_THREAD_lock_free(init_lock);
 380     init_lock = NULL;
 381
 382     CRYPTO_THREAD_cleanup_local(&in_init_config_local);
 383
 384     /*
 385      * We assume we are single-threaded for this function, i.e. no race
 386      * conditions for the various "*_inited" vars below.
 387      */
 388
 389 #ifndef OPENSSL_NO_COMP
 390     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_comp_zlib_cleanup()\n");
 391     ossl_comp_zlib_cleanup();
 392 #endif
 393
 394     if (async_inited) {
 395         OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
 396         async_deinit();
 397     }
 398
 399     /*
 400      * Note that cleanup order is important:
 401      * - ossl_rand_cleanup_int could call an ENGINE's RAND cleanup function so
 402      * must be called before engine_cleanup_int()
 403      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 404      * before the ex data handlers are wiped during default ossl_lib_ctx deinit.
 405      * - ossl_config_modules_free() can end up in ENGINE code so must be called
 406      * before engine_cleanup_int()
 407      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 408      * ossl_obj_cleanup_int() must be called last
 409      */
 410     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_rand_cleanup_int()\n");
 411     ossl_rand_cleanup_int();
 412
 413     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_config_modules_free()\n");
 414     ossl_config_modules_free();
 415
 416 #ifndef OPENSSL_NO_ENGINE
 417     OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
 418     engine_cleanup_int();
 419 #endif
 420
 421 #ifndef OPENSSL_NO_DEPRECATED_3_0
 422     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
 423     ossl_store_cleanup_int();
 424 #endif
 425
 426     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_lib_ctx_default_deinit()\n");
 427     ossl_lib_ctx_default_deinit();
 428
 429     ossl_cleanup_thread();
 430
 431     OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
 432     bio_cleanup();
 433
 434     OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
 435     evp_cleanup_int();
 436
 437     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_obj_cleanup_int()\n");
 438     ossl_obj_cleanup_int();
 439
 440     OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
 441     err_cleanup();
 442
 443     OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
 444     CRYPTO_secure_malloc_done();
 445
 446 #ifndef OPENSSL_NO_CMP
 447     OSSL_TRACE(INIT, "OPENSSL_cleanup: OSSL_CMP_log_close()\n");
 448     OSSL_CMP_log_close();
 449 #endif
 450
 451     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
 452     ossl_trace_cleanup();
 453
 454     base_inited = 0;
 455 }
 456
 457 /*
 458  * If this function is called with a non NULL settings value then it must be
 459  * called prior to any threads making calls to any OpenSSL functions,
 460  * i.e. passing a non-null settings value is assumed to be single-threaded.
 461  */
 462 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 463 {
 464     uint64_t tmp;
 465     int aloaddone = 0;
 466
 467    /* Applications depend on 0 being returned when cleanup was already done */
 468     if (stopped) {
 469         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 470             ERR_raise(ERR_LIB_CRYPTO, ERR_R_INIT_FAIL);
 471         return 0;
 472     }
 473
 474     /*
 475      * We ignore failures from this function. It is probably because we are
 476      * on a platform that doesn't support lockless atomic loads (we may not
 477      * have created optsdone_lock yet so we can't use it). This is just an
 478      * optimisation to skip the full checks in this function if we don't need
 479      * to, so we carry on regardless in the event of failure.
 480      *
 481      * There could be a race here with other threads, so that optsdone has not
 482      * been updated yet, even though the options have in fact been initialised.
 483      * This doesn't matter - it just means we will run the full function
 484      * unnecessarily - but all the critical code is contained in RUN_ONCE
 485      * functions anyway so we are safe.
 486      */
 487     if (CRYPTO_atomic_load(&optsdone, &tmp, NULL)) {
 488         if ((tmp & opts) == opts)
 489             return 1;
 490         aloaddone = 1;
 491     }
 492
 493     /*
 494      * At some point we should look at this function with a view to moving
 495      * most/all of this into OSSL_LIB_CTX.
 496      *
 497      * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
 498      * *only* option specified.  With that option we return immediately after
 499      * doing the requested limited initialization.  Note that
 500      * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
 501      * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
 502      * base already initialized this is a harmless NOOP.
 503      *
 504      * If we remain the only caller of err_shelve_state() the recursion should
 505      * perhaps be removed, but if in doubt, it can be left in place.
 506      */
 507     if (!RUN_ONCE(&base, ossl_init_base))
 508         return 0;
 509
 510     if (opts & OPENSSL_INIT_BASE_ONLY)
 511         return 1;
 512
 513     /*
 514      * optsdone_lock should definitely be set up now, so we can now repeat the
 515      * same check from above but be sure that it will work even on platforms
 516      * without lockless CRYPTO_atomic_load
 517      */
 518     if (!aloaddone) {
 519         if (!CRYPTO_atomic_load(&optsdone, &tmp, optsdone_lock))
 520             return 0;
 521         if ((tmp & opts) == opts)
 522             return 1;
 523     }
 524
 525     /*
 526      * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
 527      * should not have the side-effect of setting up exit handlers, and
 528      * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
 529      * return above.
 530      */
 531     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 532         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 533                           ossl_init_register_atexit))
 534             return 0;
 535     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 536         return 0;
 537     }
 538
 539     if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
 540         return 0;
 541
 542     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 543             && !RUN_ONCE_ALT(&load_crypto_strings,
 544                              ossl_init_no_load_crypto_strings,
 545                              ossl_init_load_crypto_strings))
 546         return 0;
 547
 548     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 549             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 550         return 0;
 551
 552     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 553             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 554                              ossl_init_add_all_ciphers))
 555         return 0;
 556
 557     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 558             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 559         return 0;
 560
 561     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 562             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 563                              ossl_init_add_all_digests))
 564         return 0;
 565
 566     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 567             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 568         return 0;
 569
 570     if ((opts & OPENSSL_INIT_ATFORK)
 571             && !openssl_init_fork_handlers())
 572         return 0;
 573
 574     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 575             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 576         return 0;
 577
 578     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 579         int loading = CRYPTO_THREAD_get_local(&in_init_config_local) != NULL;
 580
 581         /* If called recursively from OBJ_ calls, just skip it. */
 582         if (!loading) {
 583             int ret;
 584
 585             if (!CRYPTO_THREAD_set_local(&in_init_config_local, (void *)-1))
 586                 return 0;
 587             if (settings == NULL) {
 588                 ret = RUN_ONCE(&config, ossl_init_config);
 589             } else {
 590                 if (!CRYPTO_THREAD_write_lock(init_lock))
 591                     return 0;
 592                 conf_settings = settings;
 593                 ret = RUN_ONCE_ALT(&config, ossl_init_config_settings,
 594                                    ossl_init_config);
 595                 conf_settings = NULL;
 596                 CRYPTO_THREAD_unlock(init_lock);
 597             }
 598
 599             if (ret <= 0)
 600                 return 0;
 601         }
 602     }
 603
 604     if ((opts & OPENSSL_INIT_ASYNC)
 605             && !RUN_ONCE(&async, ossl_init_async))
 606         return 0;
 607
 608 #ifndef OPENSSL_NO_ENGINE
 609     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 610             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 611         return 0;
 612 # ifndef OPENSSL_NO_RDRAND
 613     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 614             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 615         return 0;
 616 # endif
 617     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 618             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 619         return 0;
 620 # ifndef OPENSSL_NO_STATIC_ENGINE
 621 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 622     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 623             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 624         return 0;
 625 #  endif
 626 #  if !defined(OPENSSL_NO_PADLOCKENG)
 627     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 628             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 629         return 0;
 630 #  endif
 631 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 632     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 633             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 634         return 0;
 635 #  endif
 636 #  if !defined(OPENSSL_NO_AFALGENG)
 637     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 638             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 639         return 0;
 640 #  endif
 641 # endif
 642     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 643                 | OPENSSL_INIT_ENGINE_OPENSSL
 644                 | OPENSSL_INIT_ENGINE_AFALG)) {
 645         ENGINE_register_all_complete();
 646     }
 647 #endif
 648
 649     if (!CRYPTO_atomic_or(&optsdone, opts, &tmp, optsdone_lock))
 650         return 0;
 651
 652     return 1;
 653 }
 654
 655 int OPENSSL_atexit(void (*handler)(void))
 656 {
 657     OPENSSL_INIT_STOP *newhand;
 658
 659 #if !defined(OPENSSL_USE_NODELETE)\
 660     && !defined(OPENSSL_NO_PINSHARED)
 661     {
 662 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 663         HMODULE handle = NULL;
 664         BOOL ret;
 665         union {
 666             void *sym;
 667             void (*func)(void);
 668         } handlersym;
 669
 670         handlersym.func = handler;
 671
 672         /*
 673          * We don't use the DSO route for WIN32 because there is a better
 674          * way
 675          */
 676         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 677                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 678                                 handlersym.sym, &handle);
 679
 680         if (!ret)
 681             return 0;
 682 # elif !defined(DSO_NONE)
 683         /*
 684          * Deliberately leak a reference to the handler. This will force the
 685          * library/code containing the handler to remain loaded until we run the
 686          * atexit handler. If -znodelete has been used then this is
 687          * unnecessary.
 688          */
 689         DSO *dso = NULL;
 690         union {
 691             void *sym;
 692             void (*func)(void);
 693         } handlersym;
 694
 695         handlersym.func = handler;
 696
 697         ERR_set_mark();
 698         dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 699         /* See same code above in ossl_init_base() for an explanation. */
 700         OSSL_TRACE1(INIT,
 701                    "atexit: obtained DSO reference? %s\n",
 702                    (dso == NULL ? "No!" : "Yes."));
 703         DSO_free(dso);
 704         ERR_pop_to_mark();
 705 # endif
 706     }
 707 #endif
 708
 709     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
 710         ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
 711         return 0;
 712     }
 713
 714     newhand->handler = handler;
 715     newhand->next = stop_handlers;
 716     stop_handlers = newhand;
 717
 718     return 1;
 719 }
 720