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 "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
37static int stopped = 0;
38static uint64_t optsdone = 0;
39
40typedef struct ossl_init_stop_st OPENSSL_INIT_STOP;
41struct ossl_init_stop_st {
42    void (*handler)(void);
43    OPENSSL_INIT_STOP *next;
44};
45
46static OPENSSL_INIT_STOP *stop_handlers = NULL;
47/* Guards access to the optsdone variable on platforms without atomics */
48static CRYPTO_RWLOCK *optsdone_lock = NULL;
49/* Guards simultaneous INIT_LOAD_CONFIG calls with non-NULL settings */
50static CRYPTO_RWLOCK *init_lock = NULL;
51static CRYPTO_THREAD_LOCAL in_init_config_local;
52
53static CRYPTO_ONCE base = CRYPTO_ONCE_STATIC_INIT;
54static int base_inited = 0;
55DEFINE_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
79err:
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
89static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;
90#if !defined(OPENSSL_SYS_UEFI) && defined(_WIN32)
91static int win32atexit(void)
92{
93    OPENSSL_cleanup();
94    return 0;
95}
96#endif
97
98DEFINE_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
119DEFINE_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
129static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;
130DEFINE_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
181static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;
182
183DEFINE_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    OSSL_TRACE(INIT, "ossl_err_load_crypto_strings()\n");
192    ret = ossl_err_load_crypto_strings();
193#endif
194    return ret;
195}
196
197DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,
198                           ossl_init_load_crypto_strings)
199{
200    /* Do nothing in this case */
201    return 1;
202}
203
204static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;
205DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)
206{
207    /*
208     * OPENSSL_NO_AUTOALGINIT is provided here to prevent at compile time
209     * pulling in all the ciphers during static linking
210     */
211#ifndef OPENSSL_NO_AUTOALGINIT
212    OSSL_TRACE(INIT, "openssl_add_all_ciphers_int()\n");
213    openssl_add_all_ciphers_int();
214#endif
215    return 1;
216}
217
218DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,
219                           ossl_init_add_all_ciphers)
220{
221    /* Do nothing */
222    return 1;
223}
224
225static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;
226DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)
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    OSSL_TRACE(INIT, "openssl_add_all_digests()\n");
234    openssl_add_all_digests_int();
235#endif
236    return 1;
237}
238
239DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,
240                           ossl_init_add_all_digests)
241{
242    /* Do nothing */
243    return 1;
244}
245
246static CRYPTO_ONCE config = CRYPTO_ONCE_STATIC_INIT;
247static int config_inited = 0;
248static const OPENSSL_INIT_SETTINGS *conf_settings = NULL;
249DEFINE_RUN_ONCE_STATIC(ossl_init_config)
250{
251    int ret = ossl_config_int(NULL);
252
253    config_inited = 1;
254    return ret;
255}
256DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_config_settings, ossl_init_config)
257{
258    int ret = ossl_config_int(conf_settings);
259
260    config_inited = 1;
261    return ret;
262}
263DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)
264{
265    OSSL_TRACE(INIT, "ossl_no_config_int()\n");
266    ossl_no_config_int();
267    config_inited = 1;
268    return 1;
269}
270
271static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
272static int async_inited = 0;
273DEFINE_RUN_ONCE_STATIC(ossl_init_async)
274{
275    OSSL_TRACE(INIT, "async_init()\n");
276    if (!async_init())
277        return 0;
278    async_inited = 1;
279    return 1;
280}
281
282#ifndef OPENSSL_NO_ENGINE
283static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
284DEFINE_RUN_ONCE_STATIC(ossl_init_engine_openssl)
285{
286    OSSL_TRACE(INIT, "engine_load_openssl_int()\n");
287    engine_load_openssl_int();
288    return 1;
289}
290# ifndef OPENSSL_NO_RDRAND
291static CRYPTO_ONCE engine_rdrand = CRYPTO_ONCE_STATIC_INIT;
292DEFINE_RUN_ONCE_STATIC(ossl_init_engine_rdrand)
293{
294    OSSL_TRACE(INIT, "engine_load_rdrand_int()\n");
295    engine_load_rdrand_int();
296    return 1;
297}
298# endif
299static CRYPTO_ONCE engine_dynamic = CRYPTO_ONCE_STATIC_INIT;
300DEFINE_RUN_ONCE_STATIC(ossl_init_engine_dynamic)
301{
302    OSSL_TRACE(INIT, "engine_load_dynamic_int()\n");
303    engine_load_dynamic_int();
304    return 1;
305}
306# ifndef OPENSSL_NO_STATIC_ENGINE
307#  ifndef OPENSSL_NO_DEVCRYPTOENG
308static CRYPTO_ONCE engine_devcrypto = CRYPTO_ONCE_STATIC_INIT;
309DEFINE_RUN_ONCE_STATIC(ossl_init_engine_devcrypto)
310{
311    OSSL_TRACE(INIT, "engine_load_devcrypto_int()\n");
312    engine_load_devcrypto_int();
313    return 1;
314}
315#  endif
316#  if !defined(OPENSSL_NO_PADLOCKENG)
317static CRYPTO_ONCE engine_padlock = CRYPTO_ONCE_STATIC_INIT;
318DEFINE_RUN_ONCE_STATIC(ossl_init_engine_padlock)
319{
320    OSSL_TRACE(INIT, "engine_load_padlock_int()\n");
321    engine_load_padlock_int();
322    return 1;
323}
324#  endif
325#  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
326static CRYPTO_ONCE engine_capi = CRYPTO_ONCE_STATIC_INIT;
327DEFINE_RUN_ONCE_STATIC(ossl_init_engine_capi)
328{
329    OSSL_TRACE(INIT, "engine_load_capi_int()\n");
330    engine_load_capi_int();
331    return 1;
332}
333#  endif
334#  if !defined(OPENSSL_NO_AFALGENG)
335static CRYPTO_ONCE engine_afalg = CRYPTO_ONCE_STATIC_INIT;
336DEFINE_RUN_ONCE_STATIC(ossl_init_engine_afalg)
337{
338    OSSL_TRACE(INIT, "engine_load_afalg_int()\n");
339    engine_load_afalg_int();
340    return 1;
341}
342#  endif
343# endif
344#endif
345
346void OPENSSL_cleanup(void)
347{
348    OPENSSL_INIT_STOP *currhandler, *lasthandler;
349
350    /*
351     * At some point we should consider looking at this function with a view to
352     * moving most/all of this into onfree handlers in OSSL_LIB_CTX.
353     */
354
355    /* If we've not been inited then no need to deinit */
356    if (!base_inited)
357        return;
358
359    /* Might be explicitly called and also by atexit */
360    if (stopped)
361        return;
362    stopped = 1;
363
364    /*
365     * Thread stop may not get automatically called by the thread library for
366     * the very last thread in some situations, so call it directly.
367     */
368    OPENSSL_thread_stop();
369
370    currhandler = stop_handlers;
371    while (currhandler != NULL) {
372        currhandler->handler();
373        lasthandler = currhandler;
374        currhandler = currhandler->next;
375        OPENSSL_free(lasthandler);
376    }
377    stop_handlers = NULL;
378
379    CRYPTO_THREAD_lock_free(optsdone_lock);
380    optsdone_lock = NULL;
381    CRYPTO_THREAD_lock_free(init_lock);
382    init_lock = NULL;
383
384    CRYPTO_THREAD_cleanup_local(&in_init_config_local);
385
386    /*
387     * We assume we are single-threaded for this function, i.e. no race
388     * conditions for the various "*_inited" vars below.
389     */
390
391#ifndef OPENSSL_NO_COMP
392    OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_comp_zlib_cleanup()\n");
393    ossl_comp_zlib_cleanup();
394#endif
395
396    if (async_inited) {
397        OSSL_TRACE(INIT, "OPENSSL_cleanup: async_deinit()\n");
398        async_deinit();
399    }
400
401    /*
402     * Note that cleanup order is important:
403     * - ossl_rand_cleanup_int could call an ENGINE's RAND cleanup function so
404     * must be called before engine_cleanup_int()
405     * - ENGINEs use CRYPTO_EX_DATA and therefore, must be cleaned up
406     * before the ex data handlers are wiped during default ossl_lib_ctx deinit.
407     * - ossl_config_modules_free() can end up in ENGINE code so must be called
408     * before engine_cleanup_int()
409     * - ENGINEs and additional EVP algorithms might use added OIDs names so
410     * ossl_obj_cleanup_int() must be called last
411     */
412    OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_rand_cleanup_int()\n");
413    ossl_rand_cleanup_int();
414
415    OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_config_modules_free()\n");
416    ossl_config_modules_free();
417
418#ifndef OPENSSL_NO_ENGINE
419    OSSL_TRACE(INIT, "OPENSSL_cleanup: engine_cleanup_int()\n");
420    engine_cleanup_int();
421#endif
422
423#ifndef OPENSSL_NO_DEPRECATED_3_0
424    OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_store_cleanup_int()\n");
425    ossl_store_cleanup_int();
426#endif
427
428    OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_lib_ctx_default_deinit()\n");
429    ossl_lib_ctx_default_deinit();
430
431    ossl_cleanup_thread();
432
433    OSSL_TRACE(INIT, "OPENSSL_cleanup: bio_cleanup()\n");
434    bio_cleanup();
435
436    OSSL_TRACE(INIT, "OPENSSL_cleanup: evp_cleanup_int()\n");
437    evp_cleanup_int();
438
439    OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_obj_cleanup_int()\n");
440    ossl_obj_cleanup_int();
441
442    OSSL_TRACE(INIT, "OPENSSL_cleanup: err_int()\n");
443    err_cleanup();
444
445    OSSL_TRACE(INIT, "OPENSSL_cleanup: CRYPTO_secure_malloc_done()\n");
446    CRYPTO_secure_malloc_done();
447
448#ifndef OPENSSL_NO_CMP
449    OSSL_TRACE(INIT, "OPENSSL_cleanup: OSSL_CMP_log_close()\n");
450    OSSL_CMP_log_close();
451#endif
452
453    OSSL_TRACE(INIT, "OPENSSL_cleanup: ossl_trace_cleanup()\n");
454    ossl_trace_cleanup();
455
456    base_inited = 0;
457}
458
459/*
460 * If this function is called with a non NULL settings value then it must be
461 * called prior to any threads making calls to any OpenSSL functions,
462 * i.e. passing a non-null settings value is assumed to be single-threaded.
463 */
464int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
465{
466    uint64_t tmp;
467    int aloaddone = 0;
468
469   /* Applications depend on 0 being returned when cleanup was already done */
470    if (stopped) {
471        if (!(opts & OPENSSL_INIT_BASE_ONLY))
472            ERR_raise(ERR_LIB_CRYPTO, ERR_R_INIT_FAIL);
473        return 0;
474    }
475
476    /*
477     * We ignore failures from this function. It is probably because we are
478     * on a platform that doesn't support lockless atomic loads (we may not
479     * have created optsdone_lock yet so we can't use it). This is just an
480     * optimisation to skip the full checks in this function if we don't need
481     * to, so we carry on regardless in the event of failure.
482     *
483     * There could be a race here with other threads, so that optsdone has not
484     * been updated yet, even though the options have in fact been initialised.
485     * This doesn't matter - it just means we will run the full function
486     * unnecessarily - but all the critical code is contained in RUN_ONCE
487     * functions anyway so we are safe.
488     */
489    if (CRYPTO_atomic_load(&optsdone, &tmp, NULL)) {
490        if ((tmp & opts) == opts)
491            return 1;
492        aloaddone = 1;
493    }
494
495    /*
496     * At some point we should look at this function with a view to moving
497     * most/all of this into OSSL_LIB_CTX.
498     *
499     * When the caller specifies OPENSSL_INIT_BASE_ONLY, that should be the
500     * *only* option specified.  With that option we return immediately after
501     * doing the requested limited initialization.  Note that
502     * err_shelve_state() called by us via ossl_init_load_crypto_nodelete()
503     * re-enters OPENSSL_init_crypto() with OPENSSL_INIT_BASE_ONLY, but with
504     * base already initialized this is a harmless NOOP.
505     *
506     * If we remain the only caller of err_shelve_state() the recursion should
507     * perhaps be removed, but if in doubt, it can be left in place.
508     */
509    if (!RUN_ONCE(&base, ossl_init_base))
510        return 0;
511
512    if (opts & OPENSSL_INIT_BASE_ONLY)
513        return 1;
514
515    /*
516     * optsdone_lock should definitely be set up now, so we can now repeat the
517     * same check from above but be sure that it will work even on platforms
518     * without lockless CRYPTO_atomic_load
519     */
520    if (!aloaddone) {
521        if (!CRYPTO_atomic_load(&optsdone, &tmp, optsdone_lock))
522            return 0;
523        if ((tmp & opts) == opts)
524            return 1;
525    }
526
527    /*
528     * Now we don't always set up exit handlers, the INIT_BASE_ONLY calls
529     * should not have the side-effect of setting up exit handlers, and
530     * therefore, this code block is below the INIT_BASE_ONLY-conditioned early
531     * return above.
532     */
533    if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {
534        if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,
535                          ossl_init_register_atexit))
536            return 0;
537    } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {
538        return 0;
539    }
540
541    if (!RUN_ONCE(&load_crypto_nodelete, ossl_init_load_crypto_nodelete))
542        return 0;
543
544    if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)
545            && !RUN_ONCE_ALT(&load_crypto_strings,
546                             ossl_init_no_load_crypto_strings,
547                             ossl_init_load_crypto_strings))
548        return 0;
549
550    if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
551            && !RUN_ONCE(&load_crypto_strings, ossl_init_load_crypto_strings))
552        return 0;
553
554    if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)
555            && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,
556                             ossl_init_add_all_ciphers))
557        return 0;
558
559    if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
560            && !RUN_ONCE(&add_all_ciphers, ossl_init_add_all_ciphers))
561        return 0;
562
563    if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)
564            && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,
565                             ossl_init_add_all_digests))
566        return 0;
567
568    if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
569            && !RUN_ONCE(&add_all_digests, ossl_init_add_all_digests))
570        return 0;
571
572    if ((opts & OPENSSL_INIT_ATFORK)
573            && !openssl_init_fork_handlers())
574        return 0;
575
576    if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)
577            && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))
578        return 0;
579
580    if (opts & OPENSSL_INIT_LOAD_CONFIG) {
581        int loading = CRYPTO_THREAD_get_local(&in_init_config_local) != NULL;
582
583        /* If called recursively from OBJ_ calls, just skip it. */
584        if (!loading) {
585            int ret;
586
587            if (!CRYPTO_THREAD_set_local(&in_init_config_local, (void *)-1))
588                return 0;
589            if (settings == NULL) {
590                ret = RUN_ONCE(&config, ossl_init_config);
591            } else {
592                if (!CRYPTO_THREAD_write_lock(init_lock))
593                    return 0;
594                conf_settings = settings;
595                ret = RUN_ONCE_ALT(&config, ossl_init_config_settings,
596                                   ossl_init_config);
597                conf_settings = NULL;
598                CRYPTO_THREAD_unlock(init_lock);
599            }
600
601            if (ret <= 0)
602                return 0;
603        }
604    }
605
606    if ((opts & OPENSSL_INIT_ASYNC)
607            && !RUN_ONCE(&async, ossl_init_async))
608        return 0;
609
610#ifndef OPENSSL_NO_ENGINE
611    if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
612            && !RUN_ONCE(&engine_openssl, ossl_init_engine_openssl))
613        return 0;
614# ifndef OPENSSL_NO_RDRAND
615    if ((opts & OPENSSL_INIT_ENGINE_RDRAND)
616            && !RUN_ONCE(&engine_rdrand, ossl_init_engine_rdrand))
617        return 0;
618# endif
619    if ((opts & OPENSSL_INIT_ENGINE_DYNAMIC)
620            && !RUN_ONCE(&engine_dynamic, ossl_init_engine_dynamic))
621        return 0;
622# ifndef OPENSSL_NO_STATIC_ENGINE
623#  ifndef OPENSSL_NO_DEVCRYPTOENG
624    if ((opts & OPENSSL_INIT_ENGINE_CRYPTODEV)
625            && !RUN_ONCE(&engine_devcrypto, ossl_init_engine_devcrypto))
626        return 0;
627#  endif
628#  if !defined(OPENSSL_NO_PADLOCKENG)
629    if ((opts & OPENSSL_INIT_ENGINE_PADLOCK)
630            && !RUN_ONCE(&engine_padlock, ossl_init_engine_padlock))
631        return 0;
632#  endif
633#  if defined(OPENSSL_SYS_WIN32) && !defined(OPENSSL_NO_CAPIENG)
634    if ((opts & OPENSSL_INIT_ENGINE_CAPI)
635            && !RUN_ONCE(&engine_capi, ossl_init_engine_capi))
636        return 0;
637#  endif
638#  if !defined(OPENSSL_NO_AFALGENG)
639    if ((opts & OPENSSL_INIT_ENGINE_AFALG)
640            && !RUN_ONCE(&engine_afalg, ossl_init_engine_afalg))
641        return 0;
642#  endif
643# endif
644    if (opts & (OPENSSL_INIT_ENGINE_ALL_BUILTIN
645                | OPENSSL_INIT_ENGINE_OPENSSL
646                | OPENSSL_INIT_ENGINE_AFALG)) {
647        ENGINE_register_all_complete();
648    }
649#endif
650
651    if (!CRYPTO_atomic_or(&optsdone, opts, &tmp, optsdone_lock))
652        return 0;
653
654    return 1;
655}
656
657int OPENSSL_atexit(void (*handler)(void))
658{
659    OPENSSL_INIT_STOP *newhand;
660
661#if !defined(OPENSSL_USE_NODELETE)\
662    && !defined(OPENSSL_NO_PINSHARED)
663    {
664# if defined(DSO_WIN32) && !defined(_WIN32_WCE)
665        HMODULE handle = NULL;
666        BOOL ret;
667        union {
668            void *sym;
669            void (*func)(void);
670        } handlersym;
671
672        handlersym.func = handler;
673
674        /*
675         * We don't use the DSO route for WIN32 because there is a better
676         * way
677         */
678        ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
679                                | GET_MODULE_HANDLE_EX_FLAG_PIN,
680                                handlersym.sym, &handle);
681
682        if (!ret)
683            return 0;
684# elif !defined(DSO_NONE)
685        /*
686         * Deliberately leak a reference to the handler. This will force the
687         * library/code containing the handler to remain loaded until we run the
688         * atexit handler. If -znodelete has been used then this is
689         * unnecessary.
690         */
691        DSO *dso = NULL;
692        union {
693            void *sym;
694            void (*func)(void);
695        } handlersym;
696
697        handlersym.func = handler;
698
699        ERR_set_mark();
700        dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
701        /* See same code above in ossl_init_base() for an explanation. */
702        OSSL_TRACE1(INIT,
703                   "atexit: obtained DSO reference? %s\n",
704                   (dso == NULL ? "No!" : "Yes."));
705        DSO_free(dso);
706        ERR_pop_to_mark();
707# endif
708    }
709#endif
710
711    if ((newhand = OPENSSL_malloc(sizeof(*newhand))) == NULL) {
712        ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
713        return 0;
714    }
715
716    newhand->handler = handler;
717    newhand->next = stop_handlers;
718    stop_handlers = newhand;
719
720    return 1;
721}
722
723