crypto/init.c

   1 /*
   2  * Copyright 2016-2024 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 #ifndef OPENSSL_NO_ATEXIT
 101 # ifdef OPENSSL_INIT_DEBUG
 102     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
 103 # endif
 104 # ifndef OPENSSL_SYS_UEFI
 105 #  if defined(_WIN32) && !defined(__BORLANDC__)
 106     /* We use _onexit() in preference because it gets called on DLL unload */
 107     if (_onexit(win32atexit) == NULL)
 108         return 0;
 109 #  else
 110     if (atexit(OPENSSL_cleanup) != 0)
 111         return 0;
 112 #  endif
 113 # endif
 114 #endif
 115
 116     return 1;
 117 }
 118
 119 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 120                            ossl_init_register_atexit)
 121 {
 122 #ifdef OPENSSL_INIT_DEBUG
 123     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 124 #endif
 125     /* Do nothing in this case */
 126     return 1;
 127 }
 128
 129 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 130 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 131 {
 132     OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
 133
 134 #if !defined(OPENSSL_USE_NODELETE) \
 135     && !defined(OPENSSL_NO_PINSHARED)
 136 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 137     {
 138         HMODULE handle = NULL;
 139         BOOL ret;
 140
 141         /* We don't use the DSO route for WIN32 because there is a better way */
 142         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 143                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 144                                 (void *)&base_inited, &handle);
 145
 146         OSSL_TRACE1(INIT,
 147                     "ossl_init_load_crypto_nodelete: "
 148                     "obtained DSO reference? %s\n",
 149                     (ret == TRUE ? "No!" : "Yes."));
 150         return (ret == TRUE) ? 1 : 0;
 151     }
 152 # elif !defined(DSO_NONE)
 153     /*
 154      * Deliberately leak a reference to ourselves. This will force the library
 155      * to remain loaded until the atexit() handler is run at process exit.
 156      */
 157     {
 158         DSO *dso;
 159         void *err;
 160
 161         if (!err_shelve_state(&err))
 162             return 0;
 163
 164         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 165         /*
 166          * In case of No!, it is uncertain our exit()-handlers can still be
 167          * called. After dlclose() the whole library might have been unloaded
 168          * already.
 169          */
 170         OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
 171                     (dso == NULL ? "No!" : "Yes."));
 172         DSO_free(dso);
 173         err_unshelve_state(err);
 174     }
 175 # endif
 176 #endif
 177
 178     return 1;
 179 }
 180
 181 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 182
 183 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 184 {
 185     int ret = 1;
 186     /*
 187      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 188      * pulling in all the error strings during static linking
 189      */
 190 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 191     void *err;
 192
 193     if (!err_shelve_state(&err))
 194         return 0;
 195
 196     OSSL_TRACE(INIT, "ossl_err_load_crypto_strings()\n");
 197     ret = ossl_err_load_crypto_strings();
 198
 199     err_unshelve_state(err);
 200 #endif
 201     return ret;
 202 }
 203
 204 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 205                            ossl_init_load_crypto_strings)
 206 {
 207     /* Do nothing in this case */
 208     return 1;
 209 }
 210
 211 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 212 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 213 {
 214     /*
 215      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 216      * pulling in all the ciphers during static linking
 217      */
 218 #ifndef OPENSSL_NO_AUTOALGINIT
 219     OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
 220     openssl_add_all_ciphers_int();
 221 #endif
 222     return 1;
 223 }
 224
 225 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 226                            ossl_init_add_all_ciphers)
 227 {
 228     /* Do nothing */
 229     return 1;
 230 }
 231
 232 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 233 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 234 {
 235     /*
 236      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 237      * pulling in all the ciphers during static linking
 238      */
 239 #ifndef OPENSSL_NO_AUTOALGINIT
 240     OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
 241     openssl_add_all_digests_int();
 242 #endif
 243     return 1;
 244 }
 245
 246 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 247                            ossl_init_add_all_digests)
 248 {
 249     /* Do nothing */
 250     return 1;
 251 }
 252
 253 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 254 static int config_inited = 0;
 255 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
 256 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 257 {
 258     int ret = ossl_config_int(NULL);
 259
 260     config_inited = 1;
 261     return ret;
 262 }
 263 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_config_settings, ossl_init_config)
 264 {
 265     int ret = ossl_config_int(conf_settings);
 266
 267     config_inited = 1;
 268     return ret;
 269 }
 270 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 271 {
 272     OSSL_TRACE(INIT, "ossl_no_config_int()\n");
 273     ossl_no_config_int();
 274     config_inited = 1;
 275     return 1;
 276 }
 277
 278 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 279 static int async_inited = 0;
 280 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 281 {
 282     OSSL_TRACE(INIT, "async_init()\n");
 283     if (!async_init())
 284         return 0;
 285     async_inited = 1;
 286     return 1;
 287 }
 288
 289 #ifndef OPENSSL_NO_ENGINE
 290 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 291 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 292 {
 293     OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
 294     engine_load_openssl_int();
 295     return 1;
 296 }
 297 # ifndef OPENSSL_NO_RDRAND
 298 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 299 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 300 {
 301     OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
 302     engine_load_rdrand_int();
 303     return 1;
 304 }
 305 # endif
 306 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 307 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 308 {
 309     OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
 310     engine_load_dynamic_int();
 311     return 1;
 312 }
 313 # ifndef OPENSSL_NO_STATIC_ENGINE
 314 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 315 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 316 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 317 {
 318     OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
 319     engine_load_devcrypto_int();
 320     return 1;
 321 }
 322 #  endif
 323 #  if !defined(OPENSSL_NO_PADLOCKENG)
 324 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 325 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 326 {
 327     OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
 328     engine_load_padlock_int();
 329     return 1;
 330 }
 331 #  endif
 332 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 333 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 334 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 335 {
 336     OSSL_TRACE(INIT, "engine_load_capi_int()\n");
 337     engine_load_capi_int();
 338     return 1;
 339 }
 340 #  endif
 341 #  if !defined(OPENSSL_NO_AFALGENG)
 342 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 343 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 344 {
 345     OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
 346     engine_load_afalg_int();
 347     return 1;
 348 }
 349 #  endif
 350 # endif
 351 #endif
 352
 353 void OPENSSL_cleanup(void)
 354 {
 355     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 356
 357     /*
 358      * At some point we should consider looking at this function with a view to
 359      * moving most/all of this into onfree handlers in OSSL_LIB_CTX.
 360      */
 361
 362     /* If we've not been inited then no need to deinit */
 363     if (!base_inited)
 364         return;
 365
 366     /* Might be explicitly called and also by atexit */
 367     if (stopped)
 368         return;
 369     stopped = 1;
 370
 371     /*
 372      * Thread stop may not get automatically called by the thread library for
 373      * the very last thread in some situations, so call it directly.
 374      */
 375     OPENSSL_thread_stop();
 376
 377     currhandler = stop_handlers;
 378     while (currhandler != NULL) {
 379         currhandler->handler();
 380         lasthandler = currhandler;
 381         currhandler = currhandler->next;
 382         OPENSSL_free(lasthandler);
 383     }
 384     stop_handlers = NULL;
 385
 386     CRYPTO_THREAD_lock_free(optsdone_lock);
 387     optsdone_lock = NULL;
 388     CRYPTO_THREAD_lock_free(init_lock);
 389     init_lock = NULL;
 390
 391     CRYPTO_THREAD_cleanup_local(&in_init_config_local);
 392
 393     /*
 394      * We assume we are single-threaded for this function, i.e. no race
 395      * conditions for the various "*_inited" vars below.
 396      */
 397
 398 #ifndef OPENSSL_NO_COMP
 399     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_comp_zlib_cleanup()\n");
 400     ossl_comp_zlib_cleanup();
 401     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_comp_brotli_cleanup()\n");
 402     ossl_comp_brotli_cleanup();
 403     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_comp_zstd_cleanup()\n");
 404     ossl_comp_zstd_cleanup();
 405 #endif
 406
 407     if (async_inited) {
 408         OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
 409         async_deinit();
 410     }
 411
 412     /*
 413      * Note that cleanup order is important:
 414      * - ossl_rand_cleanup_int could call an ENGINE's RAND cleanup function so
 415      * must be called before engine_cleanup_int()
 416      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 417      * before the ex data handlers are wiped during default ossl_lib_ctx deinit.
 418      * - ossl_config_modules_free() can end up in ENGINE code so must be called
 419      * before engine_cleanup_int()
 420      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 421      * ossl_obj_cleanup_int() must be called last
 422      */
 423     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_rand_cleanup_int()\n");
 424     ossl_rand_cleanup_int();
 425
 426     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_config_modules_free()\n");
 427     ossl_config_modules_free();
 428
 429 #ifndef OPENSSL_NO_ENGINE
 430     OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
 431     engine_cleanup_int();
 432 #endif
 433
 434 #ifndef OPENSSL_NO_DEPRECATED_3_0
 435     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
 436     ossl_store_cleanup_int();
 437 #endif
 438
 439     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_lib_ctx_default_deinit()\n");
 440     ossl_lib_ctx_default_deinit();
 441
 442     ossl_cleanup_thread();
 443
 444     OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
 445     bio_cleanup();
 446
 447     OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
 448     evp_cleanup_int();
 449
 450     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_obj_cleanup_int()\n");
 451     ossl_obj_cleanup_int();
 452
 453     OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
 454     err_cleanup();
 455
 456     OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
 457     CRYPTO_secure_malloc_done();
 458
 459 #ifndef OPENSSL_NO_CMP
 460     OSSL_TRACE(INIT, "OPENSSL_cleanup: OSSL_CMP_log_close()\n");
 461     OSSL_CMP_log_close();
 462 #endif
 463
 464     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
 465     ossl_trace_cleanup();
 466
 467     base_inited = 0;
 468 }
 469
 470 /*
 471  * If this function is called with a non NULL settings value then it must be
 472  * called prior to any threads making calls to any OpenSSL functions,
 473  * i.e. passing a non-null settings value is assumed to be single-threaded.
 474  */
 475 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 476 {
 477     uint64_t tmp;
 478     int aloaddone = 0;
 479
 480    /* Applications depend on 0 being returned when cleanup was already done */
 481     if (stopped) {
 482         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 483             ERR_raise(ERR_LIB_CRYPTO, ERR_R_INIT_FAIL);
 484         return 0;
 485     }
 486
 487     /*
 488      * We ignore failures from this function. It is probably because we are
 489      * on a platform that doesn't support lockless atomic loads (we may not
 490      * have created optsdone_lock yet so we can't use it). This is just an
 491      * optimisation to skip the full checks in this function if we don't need
 492      * to, so we carry on regardless in the event of failure.
 493      *
 494      * There could be a race here with other threads, so that optsdone has not
 495      * been updated yet, even though the options have in fact been initialised.
 496      * This doesn't matter - it just means we will run the full function
 497      * unnecessarily - but all the critical code is contained in RUN_ONCE
 498      * functions anyway so we are safe.
 499      */
 500     if (CRYPTO_atomic_load(&optsdone, &tmp, NULL)) {
 501         if ((tmp & opts) == opts)
 502             return 1;
 503         aloaddone = 1;
 504     }
 505
 506     /*
 507      * At some point we should look at this function with a view to moving
 508      * most/all of this into OSSL_LIB_CTX.
 509      *
 510      * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
 511      * *only* option specified.  With that option we return immediately after
 512      * doing the requested limited initialization.  Note that
 513      * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
 514      * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
 515      * base already initialized this is a harmless NOOP.
 516      *
 517      * If we remain the only caller of err_shelve_state() the recursion should
 518      * perhaps be removed, but if in doubt, it can be left in place.
 519      */
 520     if (!RUN_ONCE(&base, ossl_init_base))
 521         return 0;
 522
 523     if (opts & OPENSSL_INIT_BASE_ONLY)
 524         return 1;
 525
 526     /*
 527      * optsdone_lock should definitely be set up now, so we can now repeat the
 528      * same check from above but be sure that it will work even on platforms
 529      * without lockless CRYPTO_atomic_load
 530      */
 531     if (!aloaddone) {
 532         if (!CRYPTO_atomic_load(&optsdone, &tmp, optsdone_lock))
 533             return 0;
 534         if ((tmp & opts) == opts)
 535             return 1;
 536     }
 537
 538     /*
 539      * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
 540      * should not have the side-effect of setting up exit handlers, and
 541      * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
 542      * return above.
 543      */
 544     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 545         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 546                           ossl_init_register_atexit))
 547             return 0;
 548     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 549         return 0;
 550     }
 551
 552     if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
 553         return 0;
 554
 555     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 556             && !RUN_ONCE_ALT(&load_crypto_strings,
 557                              ossl_init_no_load_crypto_strings,
 558                              ossl_init_load_crypto_strings))
 559         return 0;
 560
 561     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 562             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 563         return 0;
 564
 565     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 566             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 567                              ossl_init_add_all_ciphers))
 568         return 0;
 569
 570     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 571             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 572         return 0;
 573
 574     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 575             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 576                              ossl_init_add_all_digests))
 577         return 0;
 578
 579     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 580             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 581         return 0;
 582
 583     if ((opts & OPENSSL_INIT_ATFORK)
 584             && !openssl_init_fork_handlers())
 585         return 0;
 586
 587     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 588             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 589         return 0;
 590
 591     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 592         int loading = CRYPTO_THREAD_get_local(&in_init_config_local) != NULL;
 593
 594         /* If called recursively from OBJ_ calls, just skip it. */
 595         if (!loading) {
 596             int ret;
 597
 598             if (!CRYPTO_THREAD_set_local(&in_init_config_local, (void *)-1))
 599                 return 0;
 600             if (settings == NULL) {
 601                 ret = RUN_ONCE(&config, ossl_init_config);
 602             } else {
 603                 if (!CRYPTO_THREAD_write_lock(init_lock))
 604                     return 0;
 605                 conf_settings = settings;
 606                 ret = RUN_ONCE_ALT(&config, ossl_init_config_settings,
 607                                    ossl_init_config);
 608                 conf_settings = NULL;
 609                 CRYPTO_THREAD_unlock(init_lock);
 610             }
 611
 612             if (ret <= 0)
 613                 return 0;
 614         }
 615     }
 616
 617     if ((opts & OPENSSL_INIT_ASYNC)
 618             && !RUN_ONCE(&async, ossl_init_async))
 619         return 0;
 620
 621 #ifndef OPENSSL_NO_ENGINE
 622     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 623             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 624         return 0;
 625 # ifndef OPENSSL_NO_RDRAND
 626     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 627             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 628         return 0;
 629 # endif
 630     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 631             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 632         return 0;
 633 # ifndef OPENSSL_NO_STATIC_ENGINE
 634 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 635     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 636             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 637         return 0;
 638 #  endif
 639 #  if !defined(OPENSSL_NO_PADLOCKENG)
 640     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 641             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 642         return 0;
 643 #  endif
 644 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 645     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 646             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 647         return 0;
 648 #  endif
 649 #  if !defined(OPENSSL_NO_AFALGENG)
 650     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 651             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 652         return 0;
 653 #  endif
 654 # endif
 655     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 656                 | OPENSSL_INIT_ENGINE_OPENSSL
 657                 | OPENSSL_INIT_ENGINE_AFALG)) {
 658         ENGINE_register_all_complete();
 659     }
 660 #endif
 661
 662     if (!CRYPTO_atomic_or(&optsdone, opts, &tmp, optsdone_lock))
 663         return 0;
 664
 665     return 1;
 666 }
 667
 668 int OPENSSL_atexit(void (*handler)(void))
 669 {
 670     OPENSSL_INIT_STOP *newhand;
 671
 672 #if !defined(OPENSSL_USE_NODELETE)\
 673     && !defined(OPENSSL_NO_PINSHARED)
 674     {
 675 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 676         HMODULE handle = NULL;
 677         BOOL ret;
 678         union {
 679             void *sym;
 680             void (*func)(void);
 681         } handlersym;
 682
 683         handlersym.func = handler;
 684
 685         /*
 686          * We don't use the DSO route for WIN32 because there is a better
 687          * way
 688          */
 689         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 690                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 691                                 handlersym.sym, &handle);
 692
 693         if (!ret)
 694             return 0;
 695 # elif !defined(DSO_NONE)
 696         /*
 697          * Deliberately leak a reference to the handler. This will force the
 698          * library/code containing the handler to remain loaded until we run the
 699          * atexit handler. If -znodelete has been used then this is
 700          * unnecessary.
 701          */
 702         DSO *dso = NULL;
 703         union {
 704             void *sym;
 705             void (*func)(void);
 706         } handlersym;
 707
 708         handlersym.func = handler;
 709
 710         ERR_set_mark();
 711         dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 712         /* See same code above in ossl_init_base() for an explanation. */
 713         OSSL_TRACE1(INIT,
 714                    "atexit: obtained DSO reference? %s\n",
 715                    (dso == NULL ? "No!" : "Yes."));
 716         DSO_free(dso);
 717         ERR_pop_to_mark();
 718 # endif
 719     }
 720 #endif
 721
 722     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL)
 723         return 0;
 724
 725     newhand->handler = handler;
 726     newhand->next = stop_handlers;
 727     stop_handlers = newhand;
 728
 729     return 1;
 730 }
 731