crypto/init.c

   1 /*
   2  * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "e_os.h"
  11 #include "internal/cryptlib_int.h"
  12 #include <openssl/err.h>
  13 #include "internal/rand_int.h"
  14 #include "internal/bio.h"
  15 #include <openssl/evp.h>
  16 #include "internal/evp_int.h"
  17 #include "internal/conf.h"
  18 #include "internal/async.h"
  19 #include "internal/engine.h"
  20 #include "internal/comp.h"
  21 #include "internal/err.h"
  22 #include "internal/err_int.h"
  23 #include "internal/objects.h"
  24 #include <stdlib.h>
  25 #include <assert.h>
  26 #include "internal/thread_once.h"
  27 #include "internal/dso_conf.h"
  28 #include "internal/dso.h"
  29 #include "internal/store.h"
  30
  31 static int stopped = 0;
  32
  33 /*
  34  * Since per-thread-specific-data destructors are not universally
  35  * available, i.e. not on Windows, only below CRYPTO_THREAD_LOCAL key
  36  * is assumed to have destructor associated. And then an effort is made
  37  * to call this single destructor on non-pthread platform[s].
  38  *
  39  * Initial value is "impossible". It is used as guard value to shortcut
  40  * destructor for threads terminating before libcrypto is initialized or
  41  * after it's de-initialized. Access to the key doesn't have to be
  42  * serialized for the said threads, because they didn't use libcrypto
  43  * and it doesn't matter if they pick "impossible" or derefernce real
  44  * key value and pull NULL past initialization in the first thread that
  45  * intends to use libcrypto.
  46  */
  47 static union {
  48     long sane;
  49     CRYPTO_THREAD_LOCAL value;
  50 } destructor_key = { -1 };
  51
  52 static void ossl_init_thread_stop(struct thread_local_inits_st *locals);
  53
  54 static void ossl_init_thread_destructor(void *local)
  55 {
  56     ossl_init_thread_stop((struct thread_local_inits_st *)local);
  57 }
  58
  59 static struct thread_local_inits_st *ossl_init_get_thread_local(int alloc)
  60 {
  61     struct thread_local_inits_st *local =
  62         CRYPTO_THREAD_get_local(&destructor_key.value);
  63
  64     if (alloc) {
  65         if (local == NULL
  66             && (local = OPENSSL_zalloc(sizeof(*local))) != NULL
  67             && !CRYPTO_THREAD_set_local(&destructor_key.value, local)) {
  68             OPENSSL_free(local);
  69             return NULL;
  70         }
  71     } else {
  72         CRYPTO_THREAD_set_local(&destructor_key.value, NULL);
  73     }
  74
  75     return local;
  76 }
  77
  78 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  79 struct ossl_init_stop_st {
  80     void (*handler)(void);
  81     OPENSSL_INIT_STOP *next;
  82 };
  83
  84 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  85 static CRYPTO_RWLOCK *init_lock = NULL;
  86
  87 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  88 static int base_inited = 0;
  89 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  90 {
  91     CRYPTO_THREAD_LOCAL key;
  92
  93 #ifdef OPENSSL_INIT_DEBUG
  94     fprintf(stderr, "OPENSSL_INIT: ossl_init_base: Setting up stop handlers\n");
  95 #endif
  96 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  97     ossl_malloc_setup_failures();
  98 #endif
  99     if (!CRYPTO_THREAD_init_local(&key, ossl_init_thread_destructor))
 100         return 0;
 101     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
 102         goto err;
 103     OPENSSL_cpuid_setup();
 104
 105     destructor_key.value = key;
 106     base_inited = 1;
 107     return 1;
 108
 109 err:
 110 #ifdef OPENSSL_INIT_DEBUG
 111     fprintf(stderr, "OPENSSL_INIT: ossl_init_base not ok!\n");
 112 #endif
 113     CRYPTO_THREAD_lock_free(init_lock);
 114     init_lock = NULL;
 115
 116     CRYPTO_THREAD_cleanup_local(&key);
 117     return 0;
 118 }
 119
 120 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
 121 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
 122 {
 123 # ifdef OPENSSL_INIT_DEBUG
 124     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
 125 # endif
 126 #ifndef OPENSSL_SYS_UEFI
 127     if (atexit(OPENSSL_cleanup) != 0)
 128         return 0;
 129 #endif
 130
 131     return 1;
 132 }
 133
 134 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 135                            ossl_init_register_atexit)
 136 {
 137 #ifdef OPENSSL_INIT_DEBUG
 138     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 139 #endif
 140     /* Do nothing in this case */
 141     return 1;
 142 }
 143
 144 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 145 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 146 {
 147 #ifdef OPENSSL_INIT_DEBUG
 148     fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_nodelete()\n");
 149 #endif
 150 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
 151 # ifdef DSO_WIN32
 152     {
 153         HMODULE handle = NULL;
 154         BOOL ret;
 155
 156         /* We don't use the DSO route for WIN32 because there is a better way */
 157         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 158                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 159                                 (void *)&base_inited, &handle);
 160
 161 #  ifdef OPENSSL_INIT_DEBUG
 162         fprintf(stderr, "OPENSSL_INIT: obtained DSO reference? %s\n",
 163                 (ret == TRUE ? "No!" : "Yes."));
 164 #  endif
 165         return (ret == TRUE) ? 1 : 0;
 166     }
 167 # else
 168     /*
 169      * Deliberately leak a reference to ourselves. This will force the library
 170      * to remain loaded until the atexit() handler is run at process exit.
 171      */
 172     {
 173         DSO *dso;
 174         void *err;
 175
 176         if (!err_shelve_state(&err))
 177             return 0;
 178
 179         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 180 #  ifdef OPENSSL_INIT_DEBUG
 181         fprintf(stderr, "OPENSSL_INIT: obtained DSO reference? %s\n",
 182                 (dso == NULL ? "No!" : "Yes."));
 183         /*
 184          * In case of No!, it is uncertain our exit()-handlers can still be
 185          * called. After dlclose() the whole library might have been unloaded
 186          * already.
 187          */
 188 #  endif
 189         DSO_free(dso);
 190         err_unshelve_state(err);
 191     }
 192 # endif
 193 #endif
 194
 195     return 1;
 196 }
 197
 198 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 199 static int load_crypto_strings_inited = 0;
 200 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 201 {
 202     int ret = 1;
 203     /*
 204      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 205      * pulling in all the error strings during static linking
 206      */
 207 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 208 # ifdef OPENSSL_INIT_DEBUG
 209     fprintf(stderr, "OPENSSL_INIT: ossl_init_load_crypto_strings: "
 210                     "err_load_crypto_strings_int()\n");
 211 # endif
 212     ret = err_load_crypto_strings_int();
 213     load_crypto_strings_inited = 1;
 214 #endif
 215     return ret;
 216 }
 217
 218 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 219                            ossl_init_load_crypto_strings)
 220 {
 221     /* Do nothing in this case */
 222     return 1;
 223 }
 224
 225 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 226 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 227 {
 228     /*
 229      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 230      * pulling in all the ciphers during static linking
 231      */
 232 #ifndef OPENSSL_NO_AUTOALGINIT
 233 # ifdef OPENSSL_INIT_DEBUG
 234     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_ciphers: "
 235                     "openssl_add_all_ciphers_int()\n");
 236 # endif
 237     openssl_add_all_ciphers_int();
 238 #endif
 239     return 1;
 240 }
 241
 242 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 243                            ossl_init_add_all_ciphers)
 244 {
 245     /* Do nothing */
 246     return 1;
 247 }
 248
 249 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 250 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 251 {
 252     /*
 253      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 254      * pulling in all the ciphers during static linking
 255      */
 256 #ifndef OPENSSL_NO_AUTOALGINIT
 257 # ifdef OPENSSL_INIT_DEBUG
 258     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_digests: "
 259                     "openssl_add_all_digests()\n");
 260 # endif
 261     openssl_add_all_digests_int();
 262 #endif
 263     return 1;
 264 }
 265
 266 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 267                            ossl_init_add_all_digests)
 268 {
 269     /* Do nothing */
 270     return 1;
 271 }
 272
 273 static CRYPTO_ONCE add_all_macs = CRYPTO_ONCE_STATIC_INIT;
 274 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_macs)
 275 {
 276     /*
 277      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 278      * pulling in all the macs during static linking
 279      */
 280 #ifndef OPENSSL_NO_AUTOALGINIT
 281 # ifdef OPENSSL_INIT_DEBUG
 282     fprintf(stderr, "OPENSSL_INIT: ossl_init_add_all_macs: "
 283                     "openssl_add_all_macs_int()\n");
 284 # endif
 285     openssl_add_all_macs_int();
 286 #endif
 287     return 1;
 288 }
 289
 290 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_macs, ossl_init_add_all_macs)
 291 {
 292     /* Do nothing */
 293     return 1;
 294 }
 295
 296 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 297 static int config_inited = 0;
 298 static const char *appname;
 299 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 300 {
 301 #ifdef OPENSSL_INIT_DEBUG
 302     fprintf(stderr,
 303             "OPENSSL_INIT: ossl_init_config: openssl_config(%s)\n",
 304             appname == NULL ? "NULL" : appname);
 305 #endif
 306     openssl_config_int(appname);
 307     config_inited = 1;
 308     return 1;
 309 }
 310 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 311 {
 312 #ifdef OPENSSL_INIT_DEBUG
 313     fprintf(stderr,
 314             "OPENSSL_INIT: ossl_init_config: openssl_no_config_int()\n");
 315 #endif
 316     openssl_no_config_int();
 317     config_inited = 1;
 318     return 1;
 319 }
 320
 321 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 322 static int async_inited = 0;
 323 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 324 {
 325 #ifdef OPENSSL_INIT_DEBUG
 326     fprintf(stderr, "OPENSSL_INIT: ossl_init_async: async_init()\n");
 327 #endif
 328     if (!async_init())
 329         return 0;
 330     async_inited = 1;
 331     return 1;
 332 }
 333
 334 #ifndef OPENSSL_NO_ENGINE
 335 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 336 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 337 {
 338 # ifdef OPENSSL_INIT_DEBUG
 339     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_openssl: "
 340                     "engine_load_openssl_int()\n");
 341 # endif
 342     engine_load_openssl_int();
 343     return 1;
 344 }
 345 # ifndef OPENSSL_NO_DEVCRYPTOENG
 346 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 347 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 348 {
 349 #  ifdef OPENSSL_INIT_DEBUG
 350     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_devcrypto: "
 351                     "engine_load_devcrypto_int()\n");
 352 #  endif
 353     engine_load_devcrypto_int();
 354     return 1;
 355 }
 356 # endif
 357
 358 # ifndef OPENSSL_NO_RDRAND
 359 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 360 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 361 {
 362 #  ifdef OPENSSL_INIT_DEBUG
 363     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_rdrand: "
 364                     "engine_load_rdrand_int()\n");
 365 #  endif
 366     engine_load_rdrand_int();
 367     return 1;
 368 }
 369 # endif
 370 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 371 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 372 {
 373 # ifdef OPENSSL_INIT_DEBUG
 374     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_dynamic: "
 375                     "engine_load_dynamic_int()\n");
 376 # endif
 377     engine_load_dynamic_int();
 378     return 1;
 379 }
 380 # ifndef OPENSSL_NO_STATIC_ENGINE
 381 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 382 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 383 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 384 {
 385 #   ifdef OPENSSL_INIT_DEBUG
 386     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_padlock: "
 387                     "engine_load_padlock_int()\n");
 388 #   endif
 389     engine_load_padlock_int();
 390     return 1;
 391 }
 392 #  endif
 393 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 394 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 395 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 396 {
 397 #   ifdef OPENSSL_INIT_DEBUG
 398     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_capi: "
 399                     "engine_load_capi_int()\n");
 400 #   endif
 401     engine_load_capi_int();
 402     return 1;
 403 }
 404 #  endif
 405 #  if !defined(OPENSSL_NO_AFALGENG)
 406 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 407 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 408 {
 409 #   ifdef OPENSSL_INIT_DEBUG
 410     fprintf(stderr, "OPENSSL_INIT: ossl_init_engine_afalg: "
 411                     "engine_load_afalg_int()\n");
 412 #   endif
 413     engine_load_afalg_int();
 414     return 1;
 415 }
 416 #  endif
 417 # endif
 418 #endif
 419
 420 #ifndef OPENSSL_NO_COMP
 421 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 422
 423 static int zlib_inited = 0;
 424 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 425 {
 426     /* Do nothing - we need to know about this for the later cleanup */
 427     zlib_inited = 1;
 428     return 1;
 429 }
 430 #endif
 431
 432 static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
 433 {
 434     /* Can't do much about this */
 435     if (locals == NULL)
 436         return;
 437
 438     if (locals->async) {
 439 #ifdef OPENSSL_INIT_DEBUG
 440         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 441                         "async_delete_thread_state()\n");
 442 #endif
 443         async_delete_thread_state();
 444     }
 445
 446     if (locals->err_state) {
 447 #ifdef OPENSSL_INIT_DEBUG
 448         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 449                         "err_delete_thread_state()\n");
 450 #endif
 451         err_delete_thread_state();
 452     }
 453
 454     if (locals->rand) {
 455 #ifdef OPENSSL_INIT_DEBUG
 456         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
 457                         "drbg_delete_thread_state()\n");
 458 #endif
 459         drbg_delete_thread_state();
 460     }
 461
 462     OPENSSL_free(locals);
 463 }
 464
 465 void OPENSSL_thread_stop(void)
 466 {
 467     if (destructor_key.sane != -1)
 468         ossl_init_thread_stop(ossl_init_get_thread_local(0));
 469 }
 470
 471 int ossl_init_thread_start(uint64_t opts)
 472 {
 473     struct thread_local_inits_st *locals;
 474
 475     if (!OPENSSL_init_crypto(0, NULL))
 476         return 0;
 477
 478     locals = ossl_init_get_thread_local(1);
 479
 480     if (locals == NULL)
 481         return 0;
 482
 483     if (opts & OPENSSL_INIT_THREAD_ASYNC) {
 484 #ifdef OPENSSL_INIT_DEBUG
 485         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
 486                         "marking thread for async\n");
 487 #endif
 488         locals->async = 1;
 489     }
 490
 491     if (opts & OPENSSL_INIT_THREAD_ERR_STATE) {
 492 #ifdef OPENSSL_INIT_DEBUG
 493         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
 494                         "marking thread for err_state\n");
 495 #endif
 496         locals->err_state = 1;
 497     }
 498
 499     if (opts & OPENSSL_INIT_THREAD_RAND) {
 500 #ifdef OPENSSL_INIT_DEBUG
 501         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_start: "
 502                         "marking thread for rand\n");
 503 #endif
 504         locals->rand = 1;
 505     }
 506
 507     return 1;
 508 }
 509
 510 void OPENSSL_cleanup(void)
 511 {
 512     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 513     CRYPTO_THREAD_LOCAL key;
 514
 515     /* If we've not been inited then no need to deinit */
 516     if (!base_inited)
 517         return;
 518
 519     /* Might be explicitly called and also by atexit */
 520     if (stopped)
 521         return;
 522     stopped = 1;
 523
 524     /*
 525      * Thread stop may not get automatically called by the thread library for
 526      * the very last thread in some situations, so call it directly.
 527      */
 528     ossl_init_thread_stop(ossl_init_get_thread_local(0));
 529
 530     currhandler = stop_handlers;
 531     while (currhandler != NULL) {
 532         currhandler->handler();
 533         lasthandler = currhandler;
 534         currhandler = currhandler->next;
 535         OPENSSL_free(lasthandler);
 536     }
 537     stop_handlers = NULL;
 538
 539     CRYPTO_THREAD_lock_free(init_lock);
 540     init_lock = NULL;
 541
 542     /*
 543      * We assume we are single-threaded for this function, i.e. no race
 544      * conditions for the various "*_inited" vars below.
 545      */
 546
 547 #ifndef OPENSSL_NO_COMP
 548     if (zlib_inited) {
 549 #ifdef OPENSSL_INIT_DEBUG
 550         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 551                         "comp_zlib_cleanup_int()\n");
 552 #endif
 553         comp_zlib_cleanup_int();
 554     }
 555 #endif
 556
 557     if (async_inited) {
 558 # ifdef OPENSSL_INIT_DEBUG
 559         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 560                         "async_deinit()\n");
 561 # endif
 562         async_deinit();
 563     }
 564
 565     if (load_crypto_strings_inited) {
 566 #ifdef OPENSSL_INIT_DEBUG
 567         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 568                         "err_free_strings_int()\n");
 569 #endif
 570         err_free_strings_int();
 571     }
 572
 573     key = destructor_key.value;
 574     destructor_key.sane = -1;
 575     CRYPTO_THREAD_cleanup_local(&key);
 576
 577 #ifdef OPENSSL_INIT_DEBUG
 578     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 579                     "rand_cleanup_int()\n");
 580     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 581                     "conf_modules_free_int()\n");
 582 #ifndef OPENSSL_NO_ENGINE
 583     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 584                     "engine_cleanup_int()\n");
 585 #endif
 586     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 587                     "crypto_cleanup_all_ex_data_int()\n");
 588     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 589                     "bio_sock_cleanup_int()\n");
 590     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 591                     "bio_cleanup()\n");
 592     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 593                     "evp_cleanup_int()\n");
 594     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 595                     "obj_cleanup_int()\n");
 596     fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
 597                     "err_cleanup()\n");
 598 #endif
 599     /*
 600      * Note that cleanup order is important:
 601      * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
 602      * must be called before engine_cleanup_int()
 603      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 604      * before the ex data handlers are wiped in CRYPTO_cleanup_all_ex_data().
 605      * - conf_modules_free_int() can end up in ENGINE code so must be called
 606      * before engine_cleanup_int()
 607      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 608      * obj_cleanup_int() must be called last
 609      */
 610     rand_cleanup_int();
 611     rand_drbg_cleanup_int();
 612     conf_modules_free_int();
 613 #ifndef OPENSSL_NO_ENGINE
 614     engine_cleanup_int();
 615 #endif
 616     ossl_store_cleanup_int();
 617     crypto_cleanup_all_ex_data_int();
 618     bio_cleanup();
 619     evp_cleanup_int();
 620     obj_cleanup_int();
 621     err_cleanup();
 622
 623     CRYPTO_secure_malloc_done();
 624
 625     base_inited = 0;
 626 }
 627
 628 /*
 629  * If this function is called with a non NULL settings value then it must be
 630  * called prior to any threads making calls to any OpenSSL functions,
 631  * i.e. passing a non-null settings value is assumed to be single-threaded.
 632  */
 633 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 634 {
 635     if (stopped) {
 636         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 637             CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
 638         return 0;
 639     }
 640
 641     if (!RUN_ONCE(&base, ossl_init_base))
 642         return 0;
 643
 644     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 645         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 646                           ossl_init_register_atexit))
 647             return 0;
 648     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 649         return 0;
 650     }
 651
 652     if (!(opts & OPENSSL_INIT_BASE_ONLY)
 653             && !RUN_ONCE(&load_crypto_nodelete,
 654                          ossl_init_load_crypto_nodelete))
 655         return 0;
 656
 657     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 658             && !RUN_ONCE_ALT(&load_crypto_strings,
 659                              ossl_init_no_load_crypto_strings,
 660                              ossl_init_load_crypto_strings))
 661         return 0;
 662
 663     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 664             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 665         return 0;
 666
 667     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 668             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 669                              ossl_init_add_all_ciphers))
 670         return 0;
 671
 672     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 673             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 674         return 0;
 675
 676     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 677             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 678                              ossl_init_add_all_digests))
 679         return 0;
 680
 681     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 682             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 683         return 0;
 684
 685     if ((opts & OPENSSL_INIT_NO_ADD_ALL_MACS)
 686             && !RUN_ONCE_ALT(&add_all_macs, ossl_init_no_add_all_macs,
 687                              ossl_init_add_all_macs))
 688         return 0;
 689
 690     if ((opts & OPENSSL_INIT_ADD_ALL_MACS)
 691             && !RUN_ONCE(&add_all_macs, ossl_init_add_all_macs))
 692         return 0;
 693
 694     if ((opts & OPENSSL_INIT_ATFORK)
 695             && !openssl_init_fork_handlers())
 696         return 0;
 697
 698     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 699             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 700         return 0;
 701
 702     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 703         int ret;
 704         CRYPTO_THREAD_write_lock(init_lock);
 705         appname = (settings == NULL) ? NULL : settings->appname;
 706         ret = RUN_ONCE(&config, ossl_init_config);
 707         CRYPTO_THREAD_unlock(init_lock);
 708         if (!ret)
 709             return 0;
 710     }
 711
 712     if ((opts & OPENSSL_INIT_ASYNC)
 713             && !RUN_ONCE(&async, ossl_init_async))
 714         return 0;
 715
 716 #ifndef OPENSSL_NO_ENGINE
 717     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 718             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 719         return 0;
 720 # if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_DEVCRYPTOENG)
 721     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 722             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 723         return 0;
 724 # endif
 725 # ifndef OPENSSL_NO_RDRAND
 726     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 727             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 728         return 0;
 729 # endif
 730     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 731             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 732         return 0;
 733 # ifndef OPENSSL_NO_STATIC_ENGINE
 734 #  if !defined(OPENSSL_NO_HW) && !defined(OPENSSL_NO_HW_PADLOCK)
 735     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 736             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 737         return 0;
 738 #  endif
 739 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 740     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 741             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 742         return 0;
 743 #  endif
 744 #  if !defined(OPENSSL_NO_AFALGENG)
 745     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 746             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 747         return 0;
 748 #  endif
 749 # endif
 750     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 751                 | OPENSSL_INIT_ENGINE_OPENSSL
 752                 | OPENSSL_INIT_ENGINE_AFALG)) {
 753         ENGINE_register_all_complete();
 754     }
 755 #endif
 756
 757 #ifndef OPENSSL_NO_COMP
 758     if ((opts & OPENSSL_INIT_ZLIB)
 759             && !RUN_ONCE(&zlib, ossl_init_zlib))
 760         return 0;
 761 #endif
 762
 763     return 1;
 764 }
 765
 766 int OPENSSL_atexit(void (*handler)(void))
 767 {
 768     OPENSSL_INIT_STOP *newhand;
 769
 770 #if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
 771     {
 772         union {
 773             void *sym;
 774             void (*func)(void);
 775         } handlersym;
 776
 777         handlersym.func = handler;
 778 # ifdef DSO_WIN32
 779         {
 780             HMODULE handle = NULL;
 781             BOOL ret;
 782
 783             /*
 784              * We don't use the DSO route for WIN32 because there is a better
 785              * way
 786              */
 787             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 788                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 789                                     handlersym.sym, &handle);
 790
 791             if (!ret)
 792                 return 0;
 793         }
 794 # else
 795         /*
 796          * Deliberately leak a reference to the handler. This will force the
 797          * library/code containing the handler to remain loaded until we run the
 798          * atexit handler. If -znodelete has been used then this is
 799          * unnecessary.
 800          */
 801         {
 802             DSO *dso = NULL;
 803
 804             ERR_set_mark();
 805             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 806 #  ifdef OPENSSL_INIT_DEBUG
 807             fprintf(stderr,
 808                     "OPENSSL_INIT: OPENSSL_atexit: obtained DSO reference? %s\n",
 809                     (dso == NULL ? "No!" : "Yes."));
 810             /* See same code above in ossl_init_base() for an explanation. */
 811 #  endif
 812             DSO_free(dso);
 813             ERR_pop_to_mark();
 814         }
 815 # endif
 816     }
 817 #endif
 818
 819     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
 820         CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
 821         return 0;
 822     }
 823
 824     newhand->handler = handler;
 825     newhand->next = stop_handlers;
 826     stop_handlers = newhand;
 827
 828     return 1;
 829 }
 830
 831 #ifdef OPENSSL_SYS_UNIX
 832 /*
 833  * The following three functions are for OpenSSL developers.  This is
 834  * where we set/reset state across fork (called via pthread_atfork when
 835  * it exists, or manually by the application when it doesn't).
 836  *
 837  * WARNING!  If you put code in either OPENSSL_fork_parent or
 838  * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
 839  * safe.  See this link, for example:
 840  *      http://man7.org/linux/man-pages/man7/signal-safety.7.html
 841  */
 842
 843 void OPENSSL_fork_prepare(void)
 844 {
 845 }
 846
 847 void OPENSSL_fork_parent(void)
 848 {
 849 }
 850
 851 void OPENSSL_fork_child(void)
 852 {
 853     rand_fork();
 854 }
 855 #endif