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 #include <openssl/trace.h>
  31
  32 static int stopped = 0;
  33
  34 typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
  35 struct ossl_init_stop_st {
  36     void (*handler)(void);
  37     OPENSSL_INIT_STOP *next;
  38 };
  39
  40 static OPENSSL_INIT_STOP *stop_handlers = NULL;
  41 static CRYPTO_RWLOCK *init_lock = NULL;
  42
  43 static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
  44 static int base_inited = 0;
  45 DEFINE_RUN_ONCE_STATIC(ossl_init_base)
  46 {
  47     if (ossl_trace_init() == 0)
  48         return 0;
  49
  50     OSSL_TRACE(INIT, "ossl_init_base: setting up stop handlers\n");
  51 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
  52     ossl_malloc_setup_failures();
  53 #endif
  54
  55     if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)
  56         goto err;
  57     OPENSSL_cpuid_setup();
  58
  59     if (!init_thread())
  60         return 0;
  61
  62     base_inited = 1;
  63     return 1;
  64
  65 err:
  66     OSSL_TRACE(INIT, "ossl_init_base failed!\n");
  67     CRYPTO_THREAD_lock_free(init_lock);
  68     init_lock = NULL;
  69
  70     return 0;
  71 }
  72
  73 static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
  74 #if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
  75 static int win32atexit(void)
  76 {
  77     OPENSSL_cleanup();
  78     return 0;
  79 }
  80 #endif
  81
  82 DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)
  83 {
  84 #ifdef OPENSSL_INIT_DEBUG
  85     fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");
  86 #endif
  87 #ifndef OPENSSL_SYS_UEFI
  88 # ifdef _WIN32
  89     /* We use _onexit() in preference because it gets called on DLL unload */
  90     if (_onexit(win32atexit) == NULL)
  91         return 0;
  92 # else
  93     if (atexit(OPENSSL_cleanup) != 0)
  94         return 0;
  95 # endif
  96 #endif
  97
  98     return 1;
  99 }
 100
 101 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,
 102                            ossl_init_register_atexit)
 103 {
 104 #ifdef OPENSSL_INIT_DEBUG
 105     fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");
 106 #endif
 107     /* Do nothing in this case */
 108     return 1;
 109 }
 110
 111 static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
 112 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)
 113 {
 114     OSSL_TRACE(INIT, "ossl_init_load_crypto_nodelete()\n");
 115
 116 #if !defined(OPENSSL_USE_NODELETE) \
 117     && !defined(OPENSSL_NO_PINSHARED)
 118 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 119     {
 120         HMODULE handle = NULL;
 121         BOOL ret;
 122
 123         /* We don't use the DSO route for WIN32 because there is a better way */
 124         ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 125                                 | GET_MODULE_HANDLE_EX_FLAG_PIN,
 126                                 (void *)&base_inited, &handle);
 127
 128         OSSL_TRACE1(INIT,
 129                     "ossl_init_load_crypto_nodelete: "
 130                     "obtained DSO reference? %s\n",
 131                     (ret == TRUE ? "No!" : "Yes."));
 132         return (ret == TRUE) ? 1 : 0;
 133     }
 134 # elif !defined(DSO_NONE)
 135     /*
 136      * Deliberately leak a reference to ourselves. This will force the library
 137      * to remain loaded until the atexit() handler is run at process exit.
 138      */
 139     {
 140         DSO *dso;
 141         void *err;
 142
 143         if (!err_shelve_state(&err))
 144             return 0;
 145
 146         dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
 147         /*
 148          * In case of No!, it is uncertain our exit()-handlers can still be
 149          * called. After dlclose() the whole library might have been unloaded
 150          * already.
 151          */
 152         OSSL_TRACE1(INIT, "obtained DSO reference? %s\n",
 153                     (dso == NULL ? "No!" : "Yes."));
 154         DSO_free(dso);
 155         err_unshelve_state(err);
 156     }
 157 # endif
 158 #endif
 159
 160     return 1;
 161 }
 162
 163 static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
 164 static int load_crypto_strings_inited = 0;
 165 DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)
 166 {
 167     int ret = 1;
 168     /*
 169      * OPENSSL_NO_AUTOERRINIT is provided here to prevent at compile time
 170      * pulling in all the error strings during static linking
 171      */
 172 #if !defined(OPENSSL_NO_ERR) && !defined(OPENSSL_NO_AUTOERRINIT)
 173     OSSL_TRACE(INIT, "err_load_crypto_strings_int()\n");
 174     ret = err_load_crypto_strings_int();
 175     load_crypto_strings_inited = 1;
 176 #endif
 177     return ret;
 178 }
 179
 180 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
 181                            ossl_init_load_crypto_strings)
 182 {
 183     /* Do nothing in this case */
 184     return 1;
 185 }
 186
 187 static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
 188 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
 189 {
 190     /*
 191      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 192      * pulling in all the ciphers during static linking
 193      */
 194 #ifndef OPENSSL_NO_AUTOALGINIT
 195     OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
 196     openssl_add_all_ciphers_int();
 197 #endif
 198     return 1;
 199 }
 200
 201 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
 202                            ossl_init_add_all_ciphers)
 203 {
 204     /* Do nothing */
 205     return 1;
 206 }
 207
 208 static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
 209 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
 210 {
 211     /*
 212      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 213      * pulling in all the ciphers during static linking
 214      */
 215 #ifndef OPENSSL_NO_AUTOALGINIT
 216     OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
 217     openssl_add_all_digests_int();
 218 #endif
 219     return 1;
 220 }
 221
 222 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
 223                            ossl_init_add_all_digests)
 224 {
 225     /* Do nothing */
 226     return 1;
 227 }
 228
 229 static CRYPTO_ONCE add_all_macs = CRYPTO_ONCE_STATIC_INIT;
 230 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_macs)
 231 {
 232     /*
 233      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 234      * pulling in all the macs during static linking
 235      */
 236 #ifndef OPENSSL_NO_AUTOALGINIT
 237     OSSL_TRACE(INIT, "openssl_add_all_macs_int()\n");
 238     openssl_add_all_macs_int();
 239 #endif
 240     return 1;
 241 }
 242
 243 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_macs, ossl_init_add_all_macs)
 244 {
 245     /* Do nothing */
 246     return 1;
 247 }
 248
 249 static CRYPTO_ONCE add_all_kdfs = CRYPTO_ONCE_STATIC_INIT;
 250 DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_kdfs)
 251 {
 252     /*
 253      * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
 254      * pulling in all the macs during static linking
 255      */
 256 #ifndef OPENSSL_NO_AUTOALGINIT
 257     OSSL_TRACE(INIT, "openssl_add_all_kdfs_int()\n");
 258     openssl_add_all_kdfs_int();
 259 #endif
 260     return 1;
 261 }
 262
 263 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_kdfs, ossl_init_add_all_kdfs)
 264 {
 265     /* Do nothing */
 266     return 1;
 267 }
 268
 269 static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
 270 static int config_inited = 0;
 271 static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
 272 DEFINE_RUN_ONCE_STATIC(ossl_init_config)
 273 {
 274     int ret = openssl_config_int(conf_settings);
 275     config_inited = 1;
 276     return ret;
 277 }
 278 DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
 279 {
 280     OSSL_TRACE(INIT, "openssl_no_config_int()\n");
 281     openssl_no_config_int();
 282     config_inited = 1;
 283     return 1;
 284 }
 285
 286 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 287 static int async_inited = 0;
 288 DEFINE_RUN_ONCE_STATIC(ossl_init_async)
 289 {
 290     OSSL_TRACE(INIT, "async_init()\n");
 291     if (!async_init())
 292         return 0;
 293     async_inited = 1;
 294     return 1;
 295 }
 296
 297 #ifndef OPENSSL_NO_ENGINE
 298 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
 299 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
 300 {
 301     OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
 302     engine_load_openssl_int();
 303     return 1;
 304 }
 305 # ifndef OPENSSL_NO_RDRAND
 306 static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
 307 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
 308 {
 309     OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
 310     engine_load_rdrand_int();
 311     return 1;
 312 }
 313 # endif
 314 static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
 315 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
 316 {
 317     OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
 318     engine_load_dynamic_int();
 319     return 1;
 320 }
 321 # ifndef OPENSSL_NO_STATIC_ENGINE
 322 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 323 static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
 324 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
 325 {
 326     OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
 327     engine_load_devcrypto_int();
 328     return 1;
 329 }
 330 #  endif
 331 #  if !defined(OPENSSL_NO_PADLOCKENG)
 332 static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
 333 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
 334 {
 335     OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
 336     engine_load_padlock_int();
 337     return 1;
 338 }
 339 #  endif
 340 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 341 static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
 342 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
 343 {
 344     OSSL_TRACE(INIT, "engine_load_capi_int()\n");
 345     engine_load_capi_int();
 346     return 1;
 347 }
 348 #  endif
 349 #  if !defined(OPENSSL_NO_AFALGENG)
 350 static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
 351 DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
 352 {
 353     OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
 354     engine_load_afalg_int();
 355     return 1;
 356 }
 357 #  endif
 358 # endif
 359 #endif
 360
 361 #ifndef OPENSSL_NO_COMP
 362 static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
 363
 364 static int zlib_inited = 0;
 365 DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
 366 {
 367     /* Do nothing - we need to know about this for the later cleanup */
 368     zlib_inited = 1;
 369     return 1;
 370 }
 371 #endif
 372
 373 void OPENSSL_cleanup(void)
 374 {
 375     OPENSSL_INIT_STOP *currhandler, *lasthandler;
 376
 377     /*
 378      * TODO(3.0): This function needs looking at with a view to moving most/all
 379      * of this into onfree handlers in OPENSSL_CTX.
 380      */
 381
 382     /* If we've not been inited then no need to deinit */
 383     if (!base_inited)
 384         return;
 385
 386     /* Might be explicitly called and also by atexit */
 387     if (stopped)
 388         return;
 389     stopped = 1;
 390
 391     /*
 392      * Thread stop may not get automatically called by the thread library for
 393      * the very last thread in some situations, so call it directly.
 394      */
 395     OPENSSL_thread_stop();
 396
 397     currhandler = stop_handlers;
 398     while (currhandler != NULL) {
 399         currhandler->handler();
 400         lasthandler = currhandler;
 401         currhandler = currhandler->next;
 402         OPENSSL_free(lasthandler);
 403     }
 404     stop_handlers = NULL;
 405
 406     CRYPTO_THREAD_lock_free(init_lock);
 407     init_lock = NULL;
 408
 409     /*
 410      * We assume we are single-threaded for this function, i.e. no race
 411      * conditions for the various "*_inited" vars below.
 412      */
 413
 414 #ifndef OPENSSL_NO_COMP
 415     if (zlib_inited) {
 416         OSSL_TRACE(INIT, "OPENSSL_cleanup: comp_zlib_cleanup_int()\n");
 417         comp_zlib_cleanup_int();
 418     }
 419 #endif
 420
 421     if (async_inited) {
 422         OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
 423         async_deinit();
 424     }
 425
 426     if (load_crypto_strings_inited) {
 427         OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
 428         err_free_strings_int();
 429     }
 430
 431     cleanup_thread();
 432
 433     /*
 434      * Note that cleanup order is important:
 435      * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
 436      * must be called before engine_cleanup_int()
 437      * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
 438      * before the ex data handlers are wiped during default openssl_ctx deinit.
 439      * - conf_modules_free_int() can end up in ENGINE code so must be called
 440      * before engine_cleanup_int()
 441      * - ENGINEs and additional EVP algorithms might use added OIDs names so
 442      * obj_cleanup_int() must be called last
 443      */
 444     OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_cleanup_int()\n");
 445     rand_cleanup_int();
 446
 447     OSSL_TRACE(INIT, "OPENSSL_cleanup: conf_modules_free_int()\n");
 448     conf_modules_free_int();
 449
 450 #ifndef OPENSSL_NO_ENGINE
 451     OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
 452     engine_cleanup_int();
 453 #endif
 454     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
 455     ossl_store_cleanup_int();
 456
 457     OSSL_TRACE(INIT, "OPENSSL_cleanup: openssl_ctx_default_deinit()\n");
 458     openssl_ctx_default_deinit();
 459
 460     OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
 461     bio_cleanup();
 462
 463     OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
 464     evp_cleanup_int();
 465
 466     OSSL_TRACE(INIT, "OPENSSL_cleanup: obj_cleanup_int()\n");
 467     obj_cleanup_int();
 468
 469     OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
 470     err_cleanup();
 471
 472     OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
 473     CRYPTO_secure_malloc_done();
 474
 475     OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
 476     ossl_trace_cleanup();
 477
 478     base_inited = 0;
 479 }
 480
 481 /*
 482  * If this function is called with a non NULL settings value then it must be
 483  * called prior to any threads making calls to any OpenSSL functions,
 484  * i.e. passing a non-null settings value is assumed to be single-threaded.
 485  */
 486 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
 487 {
 488     /*
 489      * TODO(3.0): This function needs looking at with a view to moving most/all
 490      * of this into OPENSSL_CTX.
 491      */
 492
 493     if (stopped) {
 494         if (!(opts & OPENSSL_INIT_BASE_ONLY))
 495             CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
 496         return 0;
 497     }
 498
 499     /*
 500      * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
 501      * *only* option specified.  With that option we return immediately after
 502      * doing the requested limited initialization.  Note that
 503      * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
 504      * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
 505      * base already initialized this is a harmless NOOP.
 506      *
 507      * If we remain the only caller of err_shelve_state() the recursion should
 508      * perhaps be removed, but if in doubt, it can be left in place.
 509      */
 510     if (!RUN_ONCE(&base, ossl_init_base))
 511         return 0;
 512
 513     if (opts & OPENSSL_INIT_BASE_ONLY)
 514         return 1;
 515
 516     /*
 517      * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
 518      * should not have the side-effect of setting up exit handlers, and
 519      * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
 520      * return above.
 521      */
 522     if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
 523         if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
 524                           ossl_init_register_atexit))
 525             return 0;
 526     } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
 527         return 0;
 528     }
 529
 530     if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
 531         return 0;
 532
 533     if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
 534             && !RUN_ONCE_ALT(&load_crypto_strings,
 535                              ossl_init_no_load_crypto_strings,
 536                              ossl_init_load_crypto_strings))
 537         return 0;
 538
 539     if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
 540             && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
 541         return 0;
 542
 543     if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
 544             && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
 545                              ossl_init_add_all_ciphers))
 546         return 0;
 547
 548     if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
 549             && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
 550         return 0;
 551
 552     if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
 553             && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
 554                              ossl_init_add_all_digests))
 555         return 0;
 556
 557     if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
 558             && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
 559         return 0;
 560
 561     if ((opts & OPENSSL_INIT_NO_ADD_ALL_MACS)
 562             && !RUN_ONCE_ALT(&add_all_macs, ossl_init_no_add_all_macs,
 563                              ossl_init_add_all_macs))
 564         return 0;
 565
 566     if ((opts & OPENSSL_INIT_ADD_ALL_MACS)
 567             && !RUN_ONCE(&add_all_macs, ossl_init_add_all_macs))
 568         return 0;
 569
 570     if ((opts & OPENSSL_INIT_NO_ADD_ALL_KDFS)
 571             && !RUN_ONCE_ALT(&add_all_kdfs, ossl_init_no_add_all_kdfs,
 572                              ossl_init_add_all_kdfs))
 573         return 0;
 574
 575     if ((opts & OPENSSL_INIT_ADD_ALL_KDFS)
 576             && !RUN_ONCE(&add_all_kdfs, ossl_init_add_all_kdfs))
 577         return 0;
 578
 579     if ((opts & OPENSSL_INIT_ATFORK)
 580             && !openssl_init_fork_handlers())
 581         return 0;
 582
 583     if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
 584             && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
 585         return 0;
 586
 587     if (opts & OPENSSL_INIT_LOAD_CONFIG) {
 588         int ret;
 589         CRYPTO_THREAD_write_lock(init_lock);
 590         conf_settings = settings;
 591         ret = RUN_ONCE(&config, ossl_init_config);
 592         conf_settings = NULL;
 593         CRYPTO_THREAD_unlock(init_lock);
 594         if (ret <= 0)
 595             return 0;
 596     }
 597
 598     if ((opts & OPENSSL_INIT_ASYNC)
 599             && !RUN_ONCE(&async, ossl_init_async))
 600         return 0;
 601
 602 #ifndef OPENSSL_NO_ENGINE
 603     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
 604             && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
 605         return 0;
 606 # ifndef OPENSSL_NO_RDRAND
 607     if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
 608             && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
 609         return 0;
 610 # endif
 611     if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
 612             && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
 613         return 0;
 614 # ifndef OPENSSL_NO_STATIC_ENGINE
 615 #  ifndef OPENSSL_NO_DEVCRYPTOENG
 616     if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
 617             && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
 618         return 0;
 619 #  endif
 620 #  if !defined(OPENSSL_NO_PADLOCKENG)
 621     if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
 622             && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
 623         return 0;
 624 #  endif
 625 #  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
 626     if ((opts & OPENSSL_INIT_ENGINE_CAPI)
 627             && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
 628         return 0;
 629 #  endif
 630 #  if !defined(OPENSSL_NO_AFALGENG)
 631     if ((opts & OPENSSL_INIT_ENGINE_AFALG)
 632             && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
 633         return 0;
 634 #  endif
 635 # endif
 636     if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
 637                 | OPENSSL_INIT_ENGINE_OPENSSL
 638                 | OPENSSL_INIT_ENGINE_AFALG)) {
 639         ENGINE_register_all_complete();
 640     }
 641 #endif
 642
 643 #ifndef OPENSSL_NO_COMP
 644     if ((opts & OPENSSL_INIT_ZLIB)
 645             && !RUN_ONCE(&zlib, ossl_init_zlib))
 646         return 0;
 647 #endif
 648
 649     return 1;
 650 }
 651
 652 int OPENSSL_atexit(void (*handler)(void))
 653 {
 654     OPENSSL_INIT_STOP *newhand;
 655
 656 #if !defined(OPENSSL_USE_NODELETE)\
 657     && !defined(OPENSSL_NO_PINSHARED)
 658     {
 659         union {
 660             void *sym;
 661             void (*func)(void);
 662         } handlersym;
 663
 664         handlersym.func = handler;
 665 # if defined(DSO_WIN32) && !defined(_WIN32_WCE)
 666         {
 667             HMODULE handle = NULL;
 668             BOOL ret;
 669
 670             /*
 671              * We don't use the DSO route for WIN32 because there is a better
 672              * way
 673              */
 674             ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
 675                                     | GET_MODULE_HANDLE_EX_FLAG_PIN,
 676                                     handlersym.sym, &handle);
 677
 678             if (!ret)
 679                 return 0;
 680         }
 681 # elif !defined(DSO_NONE)
 682         /*
 683          * Deliberately leak a reference to the handler. This will force the
 684          * library/code containing the handler to remain loaded until we run the
 685          * atexit handler. If -znodelete has been used then this is
 686          * unnecessary.
 687          */
 688         {
 689             DSO *dso = NULL;
 690
 691             ERR_set_mark();
 692             dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
 693             /* See same code above in ossl_init_base() for an explanation. */
 694             OSSL_TRACE1(INIT,
 695                        "atexit: obtained DSO reference? %s\n",
 696                        (dso == NULL ? "No!" : "Yes."));
 697             DSO_free(dso);
 698             ERR_pop_to_mark();
 699         }
 700 # endif
 701     }
 702 #endif
 703
 704     if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
 705         CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
 706         return 0;
 707     }
 708
 709     newhand->handler = handler;
 710     newhand->next = stop_handlers;
 711     stop_handlers = newhand;
 712
 713     return 1;
 714 }
 715
 716 #ifdef OPENSSL_SYS_UNIX
 717 /*
 718  * The following three functions are for OpenSSL developers.  This is
 719  * where we set/reset state across fork (called via pthread_atfork when
 720  * it exists, or manually by the application when it doesn't).
 721  *
 722  * WARNING!  If you put code in either OPENSSL_fork_parent or
 723  * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
 724  * safe.  See this link, for example:
 725  *      http://man7.org/linux/man-pages/man7/signal-safety.7.html
 726  */
 727
 728 void OPENSSL_fork_prepare(void)
 729 {
 730 }
 731
 732 void OPENSSL_fork_parent(void)
 733 {
 734 }
 735
 736 void OPENSSL_fork_child(void)
 737 {
 738     rand_fork();
 739     /* TODO(3.0): Inform all providers about a fork event */
 740 }
 741 #endif