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 "crypto/cryptlib.h"
12#include <openssl/err.h>
13#include "crypto/rand.h"
14#include "internal/bio.h"
15#include <openssl/evp.h>
16#include "crypto/evp.h"
17#include "internal/conf.h"
18#include "crypto/async.h"
19#include "crypto/engine.h"
20#include "internal/comp.h"
21#include "internal/err.h"
22#include "crypto/err.h"
23#include "crypto/objects.h"
24#include <stdlib.h>
25#include <assert.h>
26#include "internal/thread_once.h"
27#include "crypto/dso_conf.h"
28#include "internal/dso.h"
29#include "crypto/store.h"
30#include <openssl/cmp_util.h> /* for OSSL_CMP_log_close() */
31#include <openssl/trace.h>
32
33static int stopped = 0;
34
35typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
36struct ossl_init_stop_st {
37 void (*handler)(void);
38 OPENSSL_INIT_STOP *next;
39};
40
41static OPENSSL_INIT_STOP *stop_handlers = NULL;
42static CRYPTO_RWLOCK *init_lock = NULL;
43
44static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
45static int base_inited = 0;
46DEFINE_RUN_ONCE_STATIC(ossl_init_base)
47{
48 /* no need to init trace */
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 (!ossl_init_thread())
60 return 0;
61
62 base_inited = 1;
63 return 1;
64
65err:
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
73static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
74#if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
75static int win32atexit(void)
76{
77 OPENSSL_cleanup();
78 return 0;
79}
80#endif
81
82DEFINE_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
101DEFINE_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
111static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
112DEFINE_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
163static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
164static int load_crypto_strings_inited = 0;
165DEFINE_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
180DEFINE_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
187static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
188DEFINE_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
201DEFINE_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
208static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
209DEFINE_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
222DEFINE_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
229static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
230static int config_inited = 0;
231static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
232DEFINE_RUN_ONCE_STATIC(ossl_init_config)
233{
234 int ret = openssl_config_int(conf_settings);
235 config_inited = 1;
236 return ret;
237}
238DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
239{
240 OSSL_TRACE(INIT, "openssl_no_config_int()\n");
241 openssl_no_config_int();
242 config_inited = 1;
243 return 1;
244}
245
246static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
247static int async_inited = 0;
248DEFINE_RUN_ONCE_STATIC(ossl_init_async)
249{
250 OSSL_TRACE(INIT, "async_init()\n");
251 if (!async_init())
252 return 0;
253 async_inited = 1;
254 return 1;
255}
256
257#ifndef OPENSSL_NO_ENGINE
258static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
259DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
260{
261 OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
262 engine_load_openssl_int();
263 return 1;
264}
265# ifndef OPENSSL_NO_RDRAND
266static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
267DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
268{
269 OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
270 engine_load_rdrand_int();
271 return 1;
272}
273# endif
274static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
275DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
276{
277 OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
278 engine_load_dynamic_int();
279 return 1;
280}
281# ifndef OPENSSL_NO_STATIC_ENGINE
282# ifndef OPENSSL_NO_DEVCRYPTOENG
283static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
284DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
285{
286 OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
287 engine_load_devcrypto_int();
288 return 1;
289}
290# endif
291# if !defined(OPENSSL_NO_PADLOCKENG)
292static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
293DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
294{
295 OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
296 engine_load_padlock_int();
297 return 1;
298}
299# endif
300# if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
301static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
302DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
303{
304 OSSL_TRACE(INIT, "engine_load_capi_int()\n");
305 engine_load_capi_int();
306 return 1;
307}
308# endif
309# if !defined(OPENSSL_NO_AFALGENG)
310static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
311DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
312{
313 OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
314 engine_load_afalg_int();
315 return 1;
316}
317# endif
318# endif
319#endif
320
321#ifndef OPENSSL_NO_COMP
322static CRYPTO_ONCE zlib = CRYPTO_ONCE_STATIC_INIT;
323
324static int zlib_inited = 0;
325DEFINE_RUN_ONCE_STATIC(ossl_init_zlib)
326{
327 /* Do nothing - we need to know about this for the later cleanup */
328 zlib_inited = 1;
329 return 1;
330}
331#endif
332
333void OPENSSL_cleanup(void)
334{
335 OPENSSL_INIT_STOP *currhandler, *lasthandler;
336
337 /*
338 * TODO(3.0): This function needs looking at with a view to moving most/all
339 * of this into onfree handlers in OPENSSL_CTX.
340 */
341
342 /* If we've not been inited then no need to deinit */
343 if (!base_inited)
344 return;
345
346 /* Might be explicitly called and also by atexit */
347 if (stopped)
348 return;
349 stopped = 1;
350
351 /*
352 * Thread stop may not get automatically called by the thread library for
353 * the very last thread in some situations, so call it directly.
354 */
355 OPENSSL_thread_stop();
356
357 currhandler = stop_handlers;
358 while (currhandler != NULL) {
359 currhandler->handler();
360 lasthandler = currhandler;
361 currhandler = currhandler->next;
362 OPENSSL_free(lasthandler);
363 }
364 stop_handlers = NULL;
365
366 CRYPTO_THREAD_lock_free(init_lock);
367 init_lock = NULL;
368
369 /*
370 * We assume we are single-threaded for this function, i.e. no race
371 * conditions for the various "*_inited" vars below.
372 */
373
374#ifndef OPENSSL_NO_COMP
375 if (zlib_inited) {
376 OSSL_TRACE(INIT, "OPENSSL_cleanup: comp_zlib_cleanup_int()\n");
377 comp_zlib_cleanup_int();
378 }
379#endif
380
381 if (async_inited) {
382 OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
383 async_deinit();
384 }
385
386 if (load_crypto_strings_inited) {
387 OSSL_TRACE(INIT, "OPENSSL_cleanup: err_free_strings_int()\n");
388 err_free_strings_int();
389 }
390
391 /*
392 * Note that cleanup order is important:
393 * - rand_cleanup_int could call an ENGINE's RAND cleanup function so
394 * must be called before engine_cleanup_int()
395 * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
396 * before the ex data handlers are wiped during default openssl_ctx deinit.
397 * - conf_modules_free_int() can end up in ENGINE code so must be called
398 * before engine_cleanup_int()
399 * - ENGINEs and additional EVP algorithms might use added OIDs names so
400 * obj_cleanup_int() must be called last
401 */
402 OSSL_TRACE(INIT, "OPENSSL_cleanup: rand_cleanup_int()\n");
403 rand_cleanup_int();
404
405 OSSL_TRACE(INIT, "OPENSSL_cleanup: conf_modules_free_int()\n");
406 conf_modules_free_int();
407
408#ifndef OPENSSL_NO_ENGINE
409 OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
410 engine_cleanup_int();
411#endif
412 OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
413 ossl_store_cleanup_int();
414
415 OSSL_TRACE(INIT, "OPENSSL_cleanup: openssl_ctx_default_deinit()\n");
416 openssl_ctx_default_deinit();
417
418 ossl_cleanup_thread();
419
420 OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
421 bio_cleanup();
422
423 OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
424 evp_cleanup_int();
425
426 OSSL_TRACE(INIT, "OPENSSL_cleanup: obj_cleanup_int()\n");
427 obj_cleanup_int();
428
429 OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
430 err_cleanup();
431
432 OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
433 CRYPTO_secure_malloc_done();
434
435#ifndef OPENSSL_NO_CMP
436 OSSL_TRACE(INIT, "OPENSSL_cleanup: OSSL_CMP_log_close()\n");
437 OSSL_CMP_log_close();
438#endif
439
440 OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
441 ossl_trace_cleanup();
442
443 base_inited = 0;
444}
445
446/*
447 * If this function is called with a non NULL settings value then it must be
448 * called prior to any threads making calls to any OpenSSL functions,
449 * i.e. passing a non-null settings value is assumed to be single-threaded.
450 */
451int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
452{
453 /*
454 * TODO(3.0): This function needs looking at with a view to moving most/all
455 * of this into OPENSSL_CTX.
456 */
457
458 if (stopped) {
459 if (!(opts & OPENSSL_INIT_BASE_ONLY))
460 CRYPTOerr(CRYPTO_F_OPENSSL_INIT_CRYPTO, ERR_R_INIT_FAIL);
461 return 0;
462 }
463
464 /*
465 * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
466 * *only* option specified. With that option we return immediately after
467 * doing the requested limited initialization. Note that
468 * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
469 * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
470 * base already initialized this is a harmless NOOP.
471 *
472 * If we remain the only caller of err_shelve_state() the recursion should
473 * perhaps be removed, but if in doubt, it can be left in place.
474 */
475 if (!RUN_ONCE(&base, ossl_init_base))
476 return 0;
477
478 if (opts & OPENSSL_INIT_BASE_ONLY)
479 return 1;
480
481 /*
482 * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
483 * should not have the side-effect of setting up exit handlers, and
484 * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
485 * return above.
486 */
487 if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
488 if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
489 ossl_init_register_atexit))
490 return 0;
491 } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
492 return 0;
493 }
494
495 if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
496 return 0;
497
498 if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
499 && !RUN_ONCE_ALT(&load_crypto_strings,
500 ossl_init_no_load_crypto_strings,
501 ossl_init_load_crypto_strings))
502 return 0;
503
504 if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
505 && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
506 return 0;
507
508 if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
509 && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
510 ossl_init_add_all_ciphers))
511 return 0;
512
513 if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
514 && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
515 return 0;
516
517 if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
518 && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
519 ossl_init_add_all_digests))
520 return 0;
521
522 if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
523 && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
524 return 0;
525
526 if ((opts & OPENSSL_INIT_ATFORK)
527 && !openssl_init_fork_handlers())
528 return 0;
529
530 if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
531 && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
532 return 0;
533
534 if (opts & OPENSSL_INIT_LOAD_CONFIG) {
535 int ret;
536 CRYPTO_THREAD_write_lock(init_lock);
537 conf_settings = settings;
538 ret = RUN_ONCE(&config, ossl_init_config);
539 conf_settings = NULL;
540 CRYPTO_THREAD_unlock(init_lock);
541 if (ret <= 0)
542 return 0;
543 }
544
545 if ((opts & OPENSSL_INIT_ASYNC)
546 && !RUN_ONCE(&async, ossl_init_async))
547 return 0;
548
549#ifndef OPENSSL_NO_ENGINE
550 if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
551 && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
552 return 0;
553# ifndef OPENSSL_NO_RDRAND
554 if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
555 && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
556 return 0;
557# endif
558 if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
559 && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
560 return 0;
561# ifndef OPENSSL_NO_STATIC_ENGINE
562# ifndef OPENSSL_NO_DEVCRYPTOENG
563 if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
564 && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
565 return 0;
566# endif
567# if !defined(OPENSSL_NO_PADLOCKENG)
568 if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
569 && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
570 return 0;
571# endif
572# if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
573 if ((opts & OPENSSL_INIT_ENGINE_CAPI)
574 && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
575 return 0;
576# endif
577# if !defined(OPENSSL_NO_AFALGENG)
578 if ((opts & OPENSSL_INIT_ENGINE_AFALG)
579 && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
580 return 0;
581# endif
582# endif
583 if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
584 | OPENSSL_INIT_ENGINE_OPENSSL
585 | OPENSSL_INIT_ENGINE_AFALG)) {
586 ENGINE_register_all_complete();
587 }
588#endif
589
590#ifndef OPENSSL_NO_COMP
591 if ((opts & OPENSSL_INIT_ZLIB)
592 && !RUN_ONCE(&zlib, ossl_init_zlib))
593 return 0;
594#endif
595
596 return 1;
597}
598
599int OPENSSL_atexit(void (*handler)(void))
600{
601 OPENSSL_INIT_STOP *newhand;
602
603#if !defined(OPENSSL_USE_NODELETE)\
604 && !defined(OPENSSL_NO_PINSHARED)
605 {
606 union {
607 void *sym;
608 void (*func)(void);
609 } handlersym;
610
611 handlersym.func = handler;
612# if defined(DSO_WIN32) && !defined(_WIN32_WCE)
613 {
614 HMODULE handle = NULL;
615 BOOL ret;
616
617 /*
618 * We don't use the DSO route for WIN32 because there is a better
619 * way
620 */
621 ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
622 | GET_MODULE_HANDLE_EX_FLAG_PIN,
623 handlersym.sym, &handle);
624
625 if (!ret)
626 return 0;
627 }
628# elif !defined(DSO_NONE)
629 /*
630 * Deliberately leak a reference to the handler. This will force the
631 * library/code containing the handler to remain loaded until we run the
632 * atexit handler. If -znodelete has been used then this is
633 * unnecessary.
634 */
635 {
636 DSO *dso = NULL;
637
638 ERR_set_mark();
639 dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
640 /* See same code above in ossl_init_base() for an explanation. */
641 OSSL_TRACE1(INIT,
642 "atexit: obtained DSO reference? %s\n",
643 (dso == NULL ? "No!" : "Yes."));
644 DSO_free(dso);
645 ERR_pop_to_mark();
646 }
647# endif
648 }
649#endif
650
651 if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
652 CRYPTOerr(CRYPTO_F_OPENSSL_ATEXIT, ERR_R_MALLOC_FAILURE);
653 return 0;
654 }
655
656 newhand->handler = handler;
657 newhand->next = stop_handlers;
658 stop_handlers = newhand;
659
660 return 1;
661}
662
663#ifdef OPENSSL_SYS_UNIX
664/*
665 * The following three functions are for OpenSSL developers. This is
666 * where we set/reset state across fork (called via pthread_atfork when
667 * it exists, or manually by the application when it doesn't).
668 *
669 * WARNING! If you put code in either OPENSSL_fork_parent or
670 * OPENSSL_fork_child, you MUST MAKE SURE that they are async-signal-
671 * safe. See this link, for example:
672 * http://man7.org/linux/man-pages/man7/signal-safety.7.html
673 */
674
675void OPENSSL_fork_prepare(void)
676{
677}
678
679void OPENSSL_fork_parent(void)
680{
681}
682
683void OPENSSL_fork_child(void)
684{
685 /* TODO(3.0): Inform all providers about a fork event */
686}
687#endif
688