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 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
  48 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  49 static int base_inited = 0;
  50 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  51 {
  52     /* no need to init trace */
  53
  54     OSSL_TRACE(INIT, "ossl_init_base: setting up stop handlers\n");
  55 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  56     ossl_malloc_setup_failures();
  57 #endif
  58
  59     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  60         goto err;
  61     OPENSSL_cpuid_setup();
  62
  63     if (!ossl_init_thread())
  64         return 0;
  65
  66     base_inited = 1;
  67     return 1;
  68
  69 err:
  70     OSSL_TRACE(INIT, "ossl_init_base failed!\n");
  71     CRYPTO_THREAD_lock_free(init_lock);
  72     init_lock = NULL;
  73
  74     return 0;
  75 }
  76
  77 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
  78 #if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
  79 static int win32atexit(void)
  80 {
  81     OPENSSL_cleanup();
  82     return 0;
  83 }
  84 #endif
  85
  86 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
  87 {
  88 #ifdef OPENSSL_INIT_DEBUG
  89     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
  90 #endif
  91 #ifndef OPENSSL_SYS_UEFI
  92 # ifdef _WIN32
  93     /* We use _onexit() in preference because it gets called on DLL unload */
  94     if (_onexit(win32atexit) == NULL)
  95         return 0;
  96 # else
  97     if (atexit(OPENSSL_cleanup) != 0)
  98         return 0;
  99 # endif
 100 #endif
 101
 102     return 1;
 103 }
 104
 105 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 106                            ossl_init_register_atexit)
 107 {
 108 #ifdef OPENSSL_INIT_DEBUG
 109     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 110 #endif
 111     /* Do nothing in this case */
 112     return 1;
 113 }
 114
 115 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 116 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 117 {
 118     OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
 119
 120 #if !defined(OPENSSL_USE_NODELETE) \
 121     && !defined(OPENSSL_NO_PINSHARED)
 122 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 123     {
 124         HMODULE handle = NULL;
 125         BOOL ret;
 126
 127         /* We don't use the DSO route for WIN32 because there is a better way */
 128         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 129                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 130                                 (void *)&base_inited, &handle);
 131
 132         OSSL_TRACE1(INIT,
 133                     "ossl_init_load_crypto_nodelete: "
 134                     "obtained DSO reference? %s\n",
 135                     (ret == TRUE ? "No!" : "Yes."));
 136         return (ret == TRUE) ? 1 : 0;
 137     }
 138 # elif !defined(DSO_NONE)
 139     /*
 140      * Deliberately leak a reference to ourselves. This will force the library
 141      * to remain loaded until the atexit() handler is run at process exit.
 142      */
 143     {
 144         DSO *dso;
 145         void *err;
 146
 147         if (!err_shelve_state(&err))
 148             return 0;
 149
 150         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 151         /*
 152          * In case of No!, it is uncertain our exit()-handlers can still be
 153          * called. After dlclose() the whole library might have been unloaded
 154          * already.
 155          */
 156         OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
 157                     (dso == NULL ? "No!" : "Yes."));
 158         DSO_free(dso);
 159         err_unshelve_state(err);
 160     }
 161 # endif
 162 #endif
 163
 164     return 1;
 165 }
 166
 167 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 168 static int load_crypto_strings_inited = 0;
 169 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 170 {
 171     int ret = 1;
 172     /*
 173      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 174      * pulling in all the error strings during static linking
 175      */
 176 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 177     OSSL_TRACE(INIT, "err_load_crypto_strings_int()\n");
 178     ret = err_load_crypto_strings_int();
 179     load_crypto_strings_inited = 1;
 180 #endif
 181     return ret;
 182 }
 183
 184 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 185                            ossl_init_load_crypto_strings)
 186 {
 187     /* Do nothing in this case */
 188     return 1;
 189 }
 190
 191 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 192 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 193 {
 194     /*
 195      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 196      * pulling in all the ciphers during static linking
 197      */
 198 #ifndef OPENSSL_NO_AUTOALGINIT
 199     OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
 200     openssl_add_all_ciphers_int();
 201 #endif
 202     return 1;
 203 }
 204
 205 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 206                            ossl_init_add_all_ciphers)
 207 {
 208     /* Do nothing */
 209     return 1;
 210 }
 211
 212 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 213 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 214 {
 215     /*
 216      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 217      * pulling in all the ciphers during static linking
 218      */
 219 #ifndef OPENSSL_NO_AUTOALGINIT
 220     OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
 221     openssl_add_all_digests_int();
 222 #endif
 223     return 1;
 224 }
 225
 226 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 227                            ossl_init_add_all_digests)
 228 {
 229     /* Do nothing */
 230     return 1;
 231 }
 232
 233 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 234 static int config_inited = 0;
 235 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
 236 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 237 {
 238     int ret = ossl_config_int(NULL);
 239
 240     config_inited = 1;
 241     return ret;
 242 }
 243 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_config_settings, ossl_init_config)
 244 {
 245     int ret = ossl_config_int(conf_settings);
 246
 247     config_inited = 1;
 248     return ret;
 249 }
 250 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 251 {
 252     OSSL_TRACE(INIT, "ossl_no_config_int()\n");
 253     ossl_no_config_int();
 254     config_inited = 1;
 255     return 1;
 256 }
 257
 258 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 259 static int async_inited = 0;
 260 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 261 {
 262     OSSL_TRACE(INIT, "async_init()\n");
 263     if (!async_init())
 264         return 0;
 265     async_inited = 1;
 266     return 1;
 267 }
 268
 269 #ifndef OPENSSL_NO_ENGINE
 270 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 271 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 272 {
 273     OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
 274     engine_load_openssl_int();
 275     return 1;
 276 }
 277 # ifndef OPENSSL_NO_RDRAND
 278 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 279 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 280 {
 281     OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
 282     engine_load_rdrand_int();
 283     return 1;
 284 }
 285 # endif
 286 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 287 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 288 {
 289     OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
 290     engine_load_dynamic_int();
 291     return 1;
 292 }
 293 # ifndef OPENSSL_NO_STATIC_ENGINE
 294 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 295 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 296 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 297 {
 298     OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
 299     engine_load_devcrypto_int();
 300     return 1;
 301 }
 302 #  endif
 303 #  if !defined(OPENSSL_NO_PADLOCKENG)
 304 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 305 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 306 {
 307     OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
 308     engine_load_padlock_int();
 309     return 1;
 310 }
 311 #  endif
 312 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 313 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 314 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 315 {
 316     OSSL_TRACE(INIT, "engine_load_capi_int()\n");
 317     engine_load_capi_int();
 318     return 1;
 319 }
 320 #  endif
 321 #  if !defined(OPENSSL_NO_AFALGENG)
 322 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 323 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 324 {
 325     OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
 326     engine_load_afalg_int();
 327     return 1;
 328 }
 329 #  endif
 330 # endif
 331 #endif
 332
 333 #ifndef OPENSSL_NO_COMP
 334 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 335
 336 static int zlib_inited = 0;
 337 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 338 {
 339     /* Do nothing - we need to know about this for the later cleanup */
 340     zlib_inited = 1;
 341     return 1;
 342 }
 343 #endif
 344
 345 void OPENSSL_cleanup(void)
 346 {
 347     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 348
 349     /*
 350      * At some point we should consider looking at this function with a view to
 351      * moving most/all of this into onfree handlers in OSSL_LIB_CTX.
 352      */
 353
 354     /* If we've not been inited then no need to deinit */
 355     if (!base_inited)
 356         return;
 357
 358     /* Might be explicitly called and also by atexit */
 359     if (stopped)
 360         return;
 361     stopped = 1;
 362
 363     /*
 364      * Thread stop may not get automatically called by the thread library for
 365      * the very last thread in some situations, so call it directly.
 366      */
 367     OPENSSL_thread_stop();
 368
 369     currhandler = stop_handlers;
 370     while (currhandler != NULL) {
 371         currhandler->handler();
 372         lasthandler = currhandler;
 373         currhandler = currhandler->next;
 374         OPENSSL_free(lasthandler);
 375     }
 376     stop_handlers = NULL;
 377
 378     CRYPTO_THREAD_lock_free(init_lock);
 379     init_lock = NULL;
 380
 381     /*
 382      * We assume we are single-threaded for this function, i.e. no race
 383      * conditions for the various "*_inited" vars below.
 384      */
 385
 386 #ifndef OPENSSL_NO_COMP
 387     if (zlib_inited) {
 388         OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_comp_zlib_cleanup()\n");
 389         ossl_comp_zlib_cleanup();
 390     }
 391 #endif
 392
 393     if (async_inited) {
 394         OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
 395         async_deinit();
 396     }
 397
 398     if (load_crypto_strings_inited) {
 399         OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
 400         err_free_strings_int();
 401     }
 402
 403     /*
 404      * Note that cleanup order is important:
 405      * - ossl_rand_cleanup_int could call an ENGINE's RAND cleanup function so
 406      * must be called before engine_cleanup_int()
 407      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 408      * before the ex data handlers are wiped during default ossl_lib_ctx deinit.
 409      * - ossl_config_modules_free() can end up in ENGINE code so must be called
 410      * before engine_cleanup_int()
 411      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 412      * ossl_obj_cleanup_int() must be called last
 413      */
 414     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_rand_cleanup_int()\n");
 415     ossl_rand_cleanup_int();
 416
 417     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_config_modules_free()\n");
 418     ossl_config_modules_free();
 419
 420 #ifndef OPENSSL_NO_ENGINE
 421     OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
 422     engine_cleanup_int();
 423 #endif
 424
 425 #ifndef OPENSSL_NO_DEPRECATED_3_0
 426     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
 427     ossl_store_cleanup_int();
 428 #endif
 429
 430     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_lib_ctx_default_deinit()\n");
 431     ossl_lib_ctx_default_deinit();
 432
 433     ossl_cleanup_thread();
 434
 435     OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
 436     bio_cleanup();
 437
 438     OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
 439     evp_cleanup_int();
 440
 441     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_obj_cleanup_int()\n");
 442     ossl_obj_cleanup_int();
 443
 444     OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
 445     err_cleanup();
 446
 447     OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
 448     CRYPTO_secure_malloc_done();
 449
 450 #ifndef OPENSSL_NO_CMP
 451     OSSL_TRACE(INIT, "OPENSSL_cleanup: OSSL_CMP_log_close()\n");
 452     OSSL_CMP_log_close();
 453 #endif
 454
 455     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
 456     ossl_trace_cleanup();
 457
 458     base_inited = 0;
 459 }
 460
 461 /*
 462  * If this function is called with a non NULL settings value then it must be
 463  * called prior to any threads making calls to any OpenSSL functions,
 464  * i.e. passing a non-null settings value is assumed to be single-threaded.
 465  */
 466 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 467 {
 468     uint64_t tmp;
 469     int aloaddone = 0;
 470
 471     /*
 472      * We ignore failures from this function. It is probably because we are
 473      * on a platform that doesn't support lockless atomic loads (we may not
 474      * have created init_lock yet so we can't use it). This is just an
 475      * optimisation to skip the full checks in this function if we don't need
 476      * to, so we carry on regardless in the event of failure.
 477      *
 478      * There could be a race here with other threads, so that optsdone has not
 479      * been updated yet, even though the options have in fact been initialised.
 480      * This doesn't matter - it just means we will run the full function
 481      * unnecessarily - but all the critical code is contained in RUN_ONCE
 482      * functions anyway so we are safe.
 483      */
 484     if (CRYPTO_atomic_load(&optsdone, &tmp, NULL)) {
 485         if ((tmp & opts) == opts)
 486             return 1;
 487         aloaddone = 1;
 488     }
 489
 490     /*
 491      * At some point we should look at this function with a view to moving
 492      * most/all of this into OSSL_LIB_CTX.
 493      */
 494
 495     if (stopped) {
 496         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 497             ERR_raise(ERR_LIB_CRYPTO, ERR_R_INIT_FAIL);
 498         return 0;
 499     }
 500
 501     /*
 502      * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
 503      * *only* option specified.  With that option we return immediately after
 504      * doing the requested limited initialization.  Note that
 505      * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
 506      * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
 507      * base already initialized this is a harmless NOOP.
 508      *
 509      * If we remain the only caller of err_shelve_state() the recursion should
 510      * perhaps be removed, but if in doubt, it can be left in place.
 511      */
 512     if (!RUN_ONCE(&base, ossl_init_base))
 513         return 0;
 514
 515     if (opts & OPENSSL_INIT_BASE_ONLY)
 516         return 1;
 517
 518     /*
 519      * init_lock should definitely be set up now, so we can now repeat the
 520      * same check from above but be sure that it will work even on platforms
 521      * without lockless CRYPTO_atomic_load
 522      */
 523     if (!aloaddone) {
 524         if (!CRYPTO_atomic_load(&optsdone, &tmp, init_lock))
 525             return 0;
 526         if ((tmp & opts) == opts)
 527             return 1;
 528     }
 529
 530     /*
 531      * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
 532      * should not have the side-effect of setting up exit handlers, and
 533      * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
 534      * return above.
 535      */
 536     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 537         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 538                           ossl_init_register_atexit))
 539             return 0;
 540     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 541         return 0;
 542     }
 543
 544     if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
 545         return 0;
 546
 547     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 548             && !RUN_ONCE_ALT(&load_crypto_strings,
 549                              ossl_init_no_load_crypto_strings,
 550                              ossl_init_load_crypto_strings))
 551         return 0;
 552
 553     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 554             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 555         return 0;
 556
 557     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 558             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 559                              ossl_init_add_all_ciphers))
 560         return 0;
 561
 562     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 563             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 564         return 0;
 565
 566     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 567             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 568                              ossl_init_add_all_digests))
 569         return 0;
 570
 571     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 572             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 573         return 0;
 574
 575     if ((opts & OPENSSL_INIT_ATFORK)
 576             && !openssl_init_fork_handlers())
 577         return 0;
 578
 579     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 580             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 581         return 0;
 582
 583     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 584         int ret;
 585
 586         if (settings == NULL) {
 587             ret = RUN_ONCE(&config, ossl_init_config);
 588         } else {
 589             if (!CRYPTO_THREAD_write_lock(init_lock))
 590                 return 0;
 591             conf_settings = settings;
 592             ret = RUN_ONCE_ALT(&config, ossl_init_config_settings,
 593                                ossl_init_config);
 594             conf_settings = NULL;
 595             CRYPTO_THREAD_unlock(init_lock);
 596         }
 597
 598         if (ret <= 0)
 599             return 0;
 600     }
 601
 602     if ((opts & OPENSSL_INIT_ASYNC)
 603             && !RUN_ONCE(&async, ossl_init_async))
 604         return 0;
 605
 606 #ifndef OPENSSL_NO_ENGINE
 607     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 608             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 609         return 0;
 610 # ifndef OPENSSL_NO_RDRAND
 611     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 612             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 613         return 0;
 614 # endif
 615     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 616             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 617         return 0;
 618 # ifndef OPENSSL_NO_STATIC_ENGINE
 619 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 620     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 621             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 622         return 0;
 623 #  endif
 624 #  if !defined(OPENSSL_NO_PADLOCKENG)
 625     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 626             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 627         return 0;
 628 #  endif
 629 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 630     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 631             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 632         return 0;
 633 #  endif
 634 #  if !defined(OPENSSL_NO_AFALGENG)
 635     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 636             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 637         return 0;
 638 #  endif
 639 # endif
 640     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 641                 | OPENSSL_INIT_ENGINE_OPENSSL
 642                 | OPENSSL_INIT_ENGINE_AFALG)) {
 643         ENGINE_register_all_complete();
 644     }
 645 #endif
 646
 647 #ifndef OPENSSL_NO_COMP
 648     if ((opts & OPENSSL_INIT_ZLIB)
 649             && !RUN_ONCE(&zlib, ossl_init_zlib))
 650         return 0;
 651 #endif
 652
 653     if (!CRYPTO_atomic_or(&optsdone, opts, &tmp, init_lock))
 654         return 0;
 655
 656     return 1;
 657 }
 658
 659 int OPENSSL_atexit(void (*handler)(void))
 660 {
 661     OPENSSL_INIT_STOP *newhand;
 662
 663 #if !defined(OPENSSL_USE_NODELETE)\
 664     && !defined(OPENSSL_NO_PINSHARED)
 665     {
 666         union {
 667             void *sym;
 668             void (*func)(void);
 669         } handlersym;
 670
 671         handlersym.func = handler;
 672 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 673         {
 674             HMODULE handle = NULL;
 675             BOOL ret;
 676
 677             /*
 678              * We don't use the DSO route for WIN32 because there is a better
 679              * way
 680              */
 681             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 682                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 683                                     handlersym.sym, &handle);
 684
 685             if (!ret)
 686                 return 0;
 687         }
 688 # elif !defined(DSO_NONE)
 689         /*
 690          * Deliberately leak a reference to the handler. This will force the
 691          * library/code containing the handler to remain loaded until we run the
 692          * atexit handler. If -znodelete has been used then this is
 693          * unnecessary.
 694          */
 695         {
 696             DSO *dso = NULL;
 697
 698             ERR_set_mark();
 699             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 700             /* See same code above in ossl_init_base() for an explanation. */
 701             OSSL_TRACE1(INIT,
 702                        "atexit: obtained DSO reference? %s\n",
 703                        (dso == NULL ? "No!" : "Yes."));
 704             DSO_free(dso);
 705             ERR_pop_to_mark();
 706         }
 707 # endif
 708     }
 709 #endif
 710
 711     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
 712         ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
 713         return 0;
 714     }
 715
 716     newhand->handler = handler;
 717     newhand->next = stop_handlers;
 718     stop_handlers = newhand;
 719
 720     return 1;
 721 }
 722