[thirdparty/openssl.git] / crypto / context.c

/*
 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include "crypto/cryptlib.h"
#include <openssl/conf.h>
#include "internal/thread_once.h"
#include "internal/property.h"
#include "internal/core.h"
#include "internal/bio.h"
#include "internal/provider.h"

struct ossl_lib_ctx_onfree_list_st {
    ossl_lib_ctx_onfree_fn *fn;
    struct ossl_lib_ctx_onfree_list_st *next;
};

struct ossl_lib_ctx_st {
    CRYPTO_RWLOCK *lock;
    CRYPTO_EX_DATA data;

    /*
     * For most data in the OSSL_LIB_CTX we just use ex_data to store it. But
     * that doesn't work for ex_data itself - so we store that directly.
     */
    OSSL_EX_DATA_GLOBAL global;

    /* Map internal static indexes to dynamically created indexes */
    int dyn_indexes[OSSL_LIB_CTX_MAX_INDEXES];

    /* Keep a separate lock for each index */
    CRYPTO_RWLOCK *index_locks[OSSL_LIB_CTX_MAX_INDEXES];

    CRYPTO_RWLOCK *oncelock;
    int run_once_done[OSSL_LIB_CTX_MAX_RUN_ONCE];
    int run_once_ret[OSSL_LIB_CTX_MAX_RUN_ONCE];
    struct ossl_lib_ctx_onfree_list_st *onfreelist;
    unsigned int ischild:1;
};

int ossl_lib_ctx_write_lock(OSSL_LIB_CTX *ctx)
{
    return CRYPTO_THREAD_write_lock(ossl_lib_ctx_get_concrete(ctx)->lock);
}

int ossl_lib_ctx_read_lock(OSSL_LIB_CTX *ctx)
{
    return CRYPTO_THREAD_read_lock(ossl_lib_ctx_get_concrete(ctx)->lock);
}

int ossl_lib_ctx_unlock(OSSL_LIB_CTX *ctx)
{
    return CRYPTO_THREAD_unlock(ossl_lib_ctx_get_concrete(ctx)->lock);
}

int ossl_lib_ctx_is_child(OSSL_LIB_CTX *ctx)
{
    ctx = ossl_lib_ctx_get_concrete(ctx);

    if (ctx == NULL)
        return 0;
    return ctx->ischild;
}

static int context_init(OSSL_LIB_CTX *ctx)
{
    size_t i;
    int exdata_done = 0;

    ctx->lock = CRYPTO_THREAD_lock_new();
    if (ctx->lock == NULL)
        return 0;

    ctx->oncelock = CRYPTO_THREAD_lock_new();
    if (ctx->oncelock == NULL)
        goto err;

    for (i = 0; i < OSSL_LIB_CTX_MAX_INDEXES; i++) {
        ctx->index_locks[i] = CRYPTO_THREAD_lock_new();
        ctx->dyn_indexes[i] = -1;
        if (ctx->index_locks[i] == NULL)
            goto err;
    }

    /* OSSL_LIB_CTX is built on top of ex_data so we initialise that directly */
    if (!ossl_do_ex_data_init(ctx))
        goto err;
    exdata_done = 1;

    if (!ossl_crypto_new_ex_data_ex(ctx, CRYPTO_EX_INDEX_OSSL_LIB_CTX, NULL,
                                    &ctx->data)) {
        ossl_crypto_cleanup_all_ex_data_int(ctx);
        goto err;
    }

    /* Everything depends on properties, so we also pre-initialise that */
    if (!ossl_property_parse_init(ctx))
        goto err;

    return 1;
 err:
    if (exdata_done)
        ossl_crypto_cleanup_all_ex_data_int(ctx);
    CRYPTO_THREAD_lock_free(ctx->oncelock);
    CRYPTO_THREAD_lock_free(ctx->lock);
    ctx->lock = NULL;
    return 0;
}

static int context_deinit(OSSL_LIB_CTX *ctx)
{
    struct ossl_lib_ctx_onfree_list_st *tmp, *onfree;
    int i;

    if (ctx == NULL)
        return 1;

    ossl_ctx_thread_stop(ctx);

    onfree = ctx->onfreelist;
    while (onfree != NULL) {
        onfree->fn(ctx);
        tmp = onfree;
        onfree = onfree->next;
        OPENSSL_free(tmp);
    }
    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_OSSL_LIB_CTX, NULL, &ctx->data);
    ossl_crypto_cleanup_all_ex_data_int(ctx);
    for (i = 0; i < OSSL_LIB_CTX_MAX_INDEXES; i++)
        CRYPTO_THREAD_lock_free(ctx->index_locks[i]);

    CRYPTO_THREAD_lock_free(ctx->oncelock);
    CRYPTO_THREAD_lock_free(ctx->lock);
    ctx->lock = NULL;
    return 1;
}

#ifndef FIPS_MODULE
/* The default default context */
static OSSL_LIB_CTX default_context_int;

static CRYPTO_ONCE default_context_init = CRYPTO_ONCE_STATIC_INIT;
static CRYPTO_THREAD_LOCAL default_context_thread_local;

DEFINE_RUN_ONCE_STATIC(default_context_do_init)
{
    return CRYPTO_THREAD_init_local(&default_context_thread_local, NULL)
        && context_init(&default_context_int);
}

void ossl_lib_ctx_default_deinit(void)
{
    context_deinit(&default_context_int);
}

static OSSL_LIB_CTX *get_thread_default_context(void)
{
    if (!RUN_ONCE(&default_context_init, default_context_do_init))
        return NULL;

    return CRYPTO_THREAD_get_local(&default_context_thread_local);
}

static OSSL_LIB_CTX *get_default_context(void)
{
    OSSL_LIB_CTX *current_defctx = get_thread_default_context();

    if (current_defctx == NULL)
        current_defctx = &default_context_int;
    return current_defctx;
}

static int set_default_context(OSSL_LIB_CTX *defctx)
{
    if (defctx == &default_context_int)
        defctx = NULL;

    return CRYPTO_THREAD_set_local(&default_context_thread_local, defctx);
}
#endif

OSSL_LIB_CTX *OSSL_LIB_CTX_new(void)
{
    OSSL_LIB_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));

    if (ctx != NULL && !context_init(ctx)) {
        OSSL_LIB_CTX_free(ctx);
        ctx = NULL;
    }
    return ctx;
}

#ifndef FIPS_MODULE
OSSL_LIB_CTX *OSSL_LIB_CTX_new_from_dispatch(const OSSL_CORE_HANDLE *handle,
                                             const OSSL_DISPATCH *in)
{
    OSSL_LIB_CTX *ctx = OSSL_LIB_CTX_new();

    if (ctx == NULL)
        return NULL;

    if (!ossl_bio_init_core(ctx, in)) {
        OSSL_LIB_CTX_free(ctx);
        return NULL;
    }

    return ctx;
}

OSSL_LIB_CTX *OSSL_LIB_CTX_new_child(const OSSL_CORE_HANDLE *handle,
                                     const OSSL_DISPATCH *in)
{
    OSSL_LIB_CTX *ctx = OSSL_LIB_CTX_new_from_dispatch(handle, in);

    if (ctx == NULL)
        return NULL;

    if (!ossl_provider_init_as_child(ctx, handle, in)) {
        OSSL_LIB_CTX_free(ctx);
        return NULL;
    }
    ctx->ischild = 1;

    return ctx;
}

int OSSL_LIB_CTX_load_config(OSSL_LIB_CTX *ctx, const char *config_file)
{
    return CONF_modules_load_file_ex(ctx, config_file, NULL, 0) > 0;
}
#endif

void OSSL_LIB_CTX_free(OSSL_LIB_CTX *ctx)
{
    if (ossl_lib_ctx_is_default(ctx))
        return;

#ifndef FIPS_MODULE
    if (ctx->ischild)
        ossl_provider_deinit_child(ctx);
#endif
    context_deinit(ctx);
    OPENSSL_free(ctx);
}

#ifndef FIPS_MODULE
OSSL_LIB_CTX *OSSL_LIB_CTX_get0_global_default(void)
{
    if (!RUN_ONCE(&default_context_init, default_context_do_init))
        return NULL;

    return &default_context_int;
}

OSSL_LIB_CTX *OSSL_LIB_CTX_set0_default(OSSL_LIB_CTX *libctx)
{
    OSSL_LIB_CTX *current_defctx;

    if ((current_defctx = get_default_context()) != NULL) {
        if (libctx != NULL)
            set_default_context(libctx);
        return current_defctx;
    }

    return NULL;
}
#endif

OSSL_LIB_CTX *ossl_lib_ctx_get_concrete(OSSL_LIB_CTX *ctx)
{
#ifndef FIPS_MODULE
    if (ctx == NULL)
        return get_default_context();
#endif
    return ctx;
}

int ossl_lib_ctx_is_default(OSSL_LIB_CTX *ctx)
{
#ifndef FIPS_MODULE
    if (ctx == NULL || ctx == get_default_context())
        return 1;
#endif
    return 0;
}

int ossl_lib_ctx_is_global_default(OSSL_LIB_CTX *ctx)
{
#ifndef FIPS_MODULE
    if (ossl_lib_ctx_get_concrete(ctx) == &default_context_int)
        return 1;
#endif
    return 0;
}

static void ossl_lib_ctx_generic_new(void *parent_ign, void *ptr_ign,
                                     CRYPTO_EX_DATA *ad, int index,
                                     long argl_ign, void *argp)
{
    const OSSL_LIB_CTX_METHOD *meth = argp;
    OSSL_LIB_CTX *ctx = ossl_crypto_ex_data_get_ossl_lib_ctx(ad);
    void *ptr = meth->new_func(ctx);

    if (ptr != NULL) {
        if (!CRYPTO_THREAD_write_lock(ctx->lock))
            /*
             * Can't return something, so best to hope that something will
             * fail later. :(
             */
            return;
        CRYPTO_set_ex_data(ad, index, ptr);
        CRYPTO_THREAD_unlock(ctx->lock);
    }
}
static void ossl_lib_ctx_generic_free(void *parent_ign, void *ptr,
                                      CRYPTO_EX_DATA *ad, int index,
                                      long argl_ign, void *argp)
{
    const OSSL_LIB_CTX_METHOD *meth = argp;

    meth->free_func(ptr);
}

static int ossl_lib_ctx_init_index(OSSL_LIB_CTX *ctx, int static_index,
                                   const OSSL_LIB_CTX_METHOD *meth)
{
    int idx;

    ctx = ossl_lib_ctx_get_concrete(ctx);
    if (ctx == NULL)
        return 0;

    idx = ossl_crypto_get_ex_new_index_ex(ctx, CRYPTO_EX_INDEX_OSSL_LIB_CTX, 0,
                                          (void *)meth,
                                          ossl_lib_ctx_generic_new,
                                          NULL, ossl_lib_ctx_generic_free,
                                          meth->priority);
    if (idx < 0)
        return 0;

    ctx->dyn_indexes[static_index] = idx;
    return 1;
}

void *ossl_lib_ctx_get_data(OSSL_LIB_CTX *ctx, int index,
                            const OSSL_LIB_CTX_METHOD *meth)
{
    void *data = NULL;
    int dynidx;

    ctx = ossl_lib_ctx_get_concrete(ctx);
    if (ctx == NULL)
        return NULL;

    if (!CRYPTO_THREAD_read_lock(ctx->lock))
        return NULL;
    dynidx = ctx->dyn_indexes[index];
    CRYPTO_THREAD_unlock(ctx->lock);

    if (dynidx != -1) {
        if (!CRYPTO_THREAD_read_lock(ctx->index_locks[index]))
            return NULL;
        if (!CRYPTO_THREAD_read_lock(ctx->lock)) {
            CRYPTO_THREAD_unlock(ctx->index_locks[index]);
            return NULL;
        }
        data = CRYPTO_get_ex_data(&ctx->data, dynidx);
        CRYPTO_THREAD_unlock(ctx->lock);
        CRYPTO_THREAD_unlock(ctx->index_locks[index]);
        return data;
    }

    if (!CRYPTO_THREAD_write_lock(ctx->index_locks[index]))
        return NULL;
    if (!CRYPTO_THREAD_write_lock(ctx->lock)) {
        CRYPTO_THREAD_unlock(ctx->index_locks[index]);
        return NULL;
    }

    dynidx = ctx->dyn_indexes[index];
    if (dynidx != -1) {
        data = CRYPTO_get_ex_data(&ctx->data, dynidx);
        CRYPTO_THREAD_unlock(ctx->lock);
        CRYPTO_THREAD_unlock(ctx->index_locks[index]);
        return data;
    }

    if (!ossl_lib_ctx_init_index(ctx, index, meth)) {
        CRYPTO_THREAD_unlock(ctx->lock);
        CRYPTO_THREAD_unlock(ctx->index_locks[index]);
        return NULL;
    }

    CRYPTO_THREAD_unlock(ctx->lock);

    /*
     * The alloc call ensures there's a value there. We release the ctx->lock
     * for this, because the allocation itself may recursively call
     * ossl_lib_ctx_get_data for other indexes (never this one). The allocation
     * will itself aquire the ctx->lock when it actually comes to store the
     * allocated data (see ossl_lib_ctx_generic_new() above). We call
     * ossl_crypto_alloc_ex_data_intern() here instead of CRYPTO_alloc_ex_data().
     * They do the same thing except that the latter calls CRYPTO_get_ex_data()
     * as well - which we must not do without holding the ctx->lock.
     */
    if (ossl_crypto_alloc_ex_data_intern(CRYPTO_EX_INDEX_OSSL_LIB_CTX, NULL,
                                         &ctx->data, ctx->dyn_indexes[index])) {
        if (!CRYPTO_THREAD_read_lock(ctx->lock))
            goto end;
        data = CRYPTO_get_ex_data(&ctx->data, ctx->dyn_indexes[index]);
        CRYPTO_THREAD_unlock(ctx->lock);
    }

end:
    CRYPTO_THREAD_unlock(ctx->index_locks[index]);
    return data;
}

OSSL_EX_DATA_GLOBAL *ossl_lib_ctx_get_ex_data_global(OSSL_LIB_CTX *ctx)
{
    ctx = ossl_lib_ctx_get_concrete(ctx);
    if (ctx == NULL)
        return NULL;
    return &ctx->global;
}

int ossl_lib_ctx_run_once(OSSL_LIB_CTX *ctx, unsigned int idx,
                          ossl_lib_ctx_run_once_fn run_once_fn)
{
    int done = 0, ret = 0;

    ctx = ossl_lib_ctx_get_concrete(ctx);
    if (ctx == NULL)
        return 0;

    if (!CRYPTO_THREAD_read_lock(ctx->oncelock))
        return 0;
    done = ctx->run_once_done[idx];
    if (done)
        ret = ctx->run_once_ret[idx];
    CRYPTO_THREAD_unlock(ctx->oncelock);

    if (done)
        return ret;

    if (!CRYPTO_THREAD_write_lock(ctx->oncelock))
        return 0;
    if (ctx->run_once_done[idx]) {
        ret = ctx->run_once_ret[idx];
        CRYPTO_THREAD_unlock(ctx->oncelock);
        return ret;
    }

    ret = run_once_fn(ctx);
    ctx->run_once_done[idx] = 1;
    ctx->run_once_ret[idx] = ret;
    CRYPTO_THREAD_unlock(ctx->oncelock);

    return ret;
}

int ossl_lib_ctx_onfree(OSSL_LIB_CTX *ctx, ossl_lib_ctx_onfree_fn onfreefn)
{
    struct ossl_lib_ctx_onfree_list_st *newonfree
        = OPENSSL_malloc(sizeof(*newonfree));

    if (newonfree == NULL)
        return 0;

    newonfree->fn = onfreefn;
    newonfree->next = ctx->onfreelist;
    ctx->onfreelist = newonfree;

    return 1;
}

const char *ossl_lib_ctx_get_descriptor(OSSL_LIB_CTX *libctx)
{
#ifdef FIPS_MODULE
    return "FIPS internal library context";
#else
    if (ossl_lib_ctx_is_global_default(libctx))
        return "Global default library context";
    if (ossl_lib_ctx_is_default(libctx))
        return "Thread-local default library context";
    return "Non-default library context";
#endif
}
Commit	Line	Data
d64b6299	1	/*
4333b89f	2	* Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
d64b6299 RL	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
25f2138b	10	#include "crypto/cryptlib.h"
22e27978	11	#include <openssl/conf.h>
d64b6299	12	#include "internal/thread_once.h"
505f4660	13	#include "internal/property.h"
4b1f34f1	14	#include "internal/core.h"
b0ee1de9	15	#include "internal/bio.h"
f12a5690	16	#include "internal/provider.h"
d64b6299	17
b4250010 DMSP	18	struct ossl_lib_ctx_onfree_list_st {
	19	ossl_lib_ctx_onfree_fn *fn;
	20	struct ossl_lib_ctx_onfree_list_st *next;
b8fe36fe MC	21	};
b8fe36fe MC	22
b4250010	23	struct ossl_lib_ctx_st {
d64b6299 RL	24	CRYPTO_RWLOCK *lock;
d64b6299 RL	25	CRYPTO_EX_DATA data;
1aedc35f MC	26
1aedc35f MC	27	/*
b4250010	28	* For most data in the OSSL_LIB_CTX we just use ex_data to store it. But
1aedc35f MC	29	* that doesn't work for ex_data itself - so we store that directly.
	30	*/
	31	OSSL_EX_DATA_GLOBAL global;
	32
	33	/* Map internal static indexes to dynamically created indexes */
b4250010	34	int dyn_indexes[OSSL_LIB_CTX_MAX_INDEXES];
1aedc35f	35
770de346	36	/* Keep a separate lock for each index */
b4250010	37	CRYPTO_RWLOCK *index_locks[OSSL_LIB_CTX_MAX_INDEXES];
770de346	38
1aedc35f	39	CRYPTO_RWLOCK *oncelock;
b4250010 DMSP	40	int run_once_done[OSSL_LIB_CTX_MAX_RUN_ONCE];
	41	int run_once_ret[OSSL_LIB_CTX_MAX_RUN_ONCE];
	42	struct ossl_lib_ctx_onfree_list_st *onfreelist;
f12a5690	43	unsigned int ischild:1;
d64b6299 RL	44	};
d64b6299 RL	45
4b1f34f1 P	46	int ossl_lib_ctx_write_lock(OSSL_LIB_CTX *ctx)
	47	{
	48	return CRYPTO_THREAD_write_lock(ossl_lib_ctx_get_concrete(ctx)->lock);
	49	}
	50
	51	int ossl_lib_ctx_read_lock(OSSL_LIB_CTX *ctx)
	52	{
	53	return CRYPTO_THREAD_read_lock(ossl_lib_ctx_get_concrete(ctx)->lock);
	54	}
	55
	56	int ossl_lib_ctx_unlock(OSSL_LIB_CTX *ctx)
	57	{
	58	return CRYPTO_THREAD_unlock(ossl_lib_ctx_get_concrete(ctx)->lock);
	59	}
	60
f12a5690 MC	61	int ossl_lib_ctx_is_child(OSSL_LIB_CTX *ctx)
	62	{
	63	ctx = ossl_lib_ctx_get_concrete(ctx);
	64
	65	if (ctx == NULL)
	66	return 0;
	67	return ctx->ischild;
	68	}
	69
b4250010	70	static int context_init(OSSL_LIB_CTX *ctx)
d64b6299	71	{
1aedc35f	72	size_t i;
505f4660	73	int exdata_done = 0;
1aedc35f MC	74
	75	ctx->lock = CRYPTO_THREAD_lock_new();
	76	if (ctx->lock == NULL)
	77	return 0;
	78
	79	ctx->oncelock = CRYPTO_THREAD_lock_new();
	80	if (ctx->oncelock == NULL)
	81	goto err;
	82
b4250010	83	for (i = 0; i < OSSL_LIB_CTX_MAX_INDEXES; i++) {
770de346	84	ctx->index_locks[i] = CRYPTO_THREAD_lock_new();
1aedc35f	85	ctx->dyn_indexes[i] = -1;
770de346 MC	86	if (ctx->index_locks[i] == NULL)
	87	goto err;
	88	}
1aedc35f	89
b4250010	90	/* OSSL_LIB_CTX is built on top of ex_data so we initialise that directly */
e4bec869	91	if (!ossl_do_ex_data_init(ctx))
1aedc35f	92	goto err;
505f4660	93	exdata_done = 1;
1aedc35f	94
e4bec869 SL	95	if (!ossl_crypto_new_ex_data_ex(ctx, CRYPTO_EX_INDEX_OSSL_LIB_CTX, NULL,
	96	&ctx->data)) {
	97	ossl_crypto_cleanup_all_ex_data_int(ctx);
1aedc35f MC	98	goto err;
	99	}
	100
505f4660 MC	101	/* Everything depends on properties, so we also pre-initialise that */
	102	if (!ossl_property_parse_init(ctx))
	103	goto err;
	104
1aedc35f MC	105	return 1;
1aedc35f MC	106	err:
505f4660	107	if (exdata_done)
e4bec869	108	ossl_crypto_cleanup_all_ex_data_int(ctx);
1aedc35f MC	109	CRYPTO_THREAD_lock_free(ctx->oncelock);
	110	CRYPTO_THREAD_lock_free(ctx->lock);
	111	ctx->lock = NULL;
	112	return 0;
d64b6299 RL	113	}
d64b6299 RL	114
b4250010	115	static int context_deinit(OSSL_LIB_CTX *ctx)
d64b6299	116	{
b4250010	117	struct ossl_lib_ctx_onfree_list_st tmp, onfree;
770de346	118	int i;
1aedc35f MC	119
	120	if (ctx == NULL)
	121	return 1;
b8fe36fe	122
da747958 MC	123	ossl_ctx_thread_stop(ctx);
da747958 MC	124
1aedc35f	125	onfree = ctx->onfreelist;
b8fe36fe MC	126	while (onfree != NULL) {
	127	onfree->fn(ctx);
	128	tmp = onfree;
	129	onfree = onfree->next;
	130	OPENSSL_free(tmp);
	131	}
b4250010	132	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_OSSL_LIB_CTX, NULL, &ctx->data);
e4bec869	133	ossl_crypto_cleanup_all_ex_data_int(ctx);
b4250010	134	for (i = 0; i < OSSL_LIB_CTX_MAX_INDEXES; i++)
770de346 MC	135	CRYPTO_THREAD_lock_free(ctx->index_locks[i]);
770de346 MC	136
1aedc35f	137	CRYPTO_THREAD_lock_free(ctx->oncelock);
d64b6299	138	CRYPTO_THREAD_lock_free(ctx->lock);
1aedc35f	139	ctx->lock = NULL;
d64b6299 RL	140	return 1;
	141	}
	142
f844f9eb	143	#ifndef FIPS_MODULE
5a975275	144	/* The default default context */
b4250010	145	static OSSL_LIB_CTX default_context_int;
5a975275 RL	146
	147	static CRYPTO_ONCE default_context_init = CRYPTO_ONCE_STATIC_INIT;
	148	static CRYPTO_THREAD_LOCAL default_context_thread_local;
	149
	150	DEFINE_RUN_ONCE_STATIC(default_context_do_init)
	151	{
	152	return CRYPTO_THREAD_init_local(&default_context_thread_local, NULL)
	153	&& context_init(&default_context_int);
	154	}
	155
b4250010	156	void ossl_lib_ctx_default_deinit(void)
d64b6299	157	{
5a975275	158	context_deinit(&default_context_int);
d64b6299	159	}
1aedc35f	160
b4250010	161	static OSSL_LIB_CTX *get_thread_default_context(void)
d64b6299	162	{
5a975275 RL	163	if (!RUN_ONCE(&default_context_init, default_context_do_init))
5a975275 RL	164	return NULL;
1aedc35f	165
5a975275 RL	166	return CRYPTO_THREAD_get_local(&default_context_thread_local);
	167	}
	168
b4250010	169	static OSSL_LIB_CTX *get_default_context(void)
5a975275	170	{
b4250010	171	OSSL_LIB_CTX *current_defctx = get_thread_default_context();
5a975275 RL	172
	173	if (current_defctx == NULL)
	174	current_defctx = &default_context_int;
	175	return current_defctx;
	176	}
	177
b4250010	178	static int set_default_context(OSSL_LIB_CTX *defctx)
5a975275 RL	179	{
	180	if (defctx == &default_context_int)
	181	defctx = NULL;
	182
	183	return CRYPTO_THREAD_set_local(&default_context_thread_local, defctx);
d64b6299	184	}
1aedc35f	185	#endif
d64b6299	186
b4250010	187	OSSL_LIB_CTX *OSSL_LIB_CTX_new(void)
d64b6299	188	{
b4250010	189	OSSL_LIB_CTX ctx = OPENSSL_zalloc(sizeof(ctx));
d64b6299 RL	190
d64b6299 RL	191	if (ctx != NULL && !context_init(ctx)) {
b4250010	192	OSSL_LIB_CTX_free(ctx);
d64b6299 RL	193	ctx = NULL;
	194	}
	195	return ctx;
	196	}
	197
f844f9eb	198	#ifndef FIPS_MODULE
f12a5690 MC	199	OSSL_LIB_CTX OSSL_LIB_CTX_new_from_dispatch(const OSSL_CORE_HANDLE handle,
f12a5690 MC	200	const OSSL_DISPATCH *in)
b0ee1de9 MC	201	{
	202	OSSL_LIB_CTX *ctx = OSSL_LIB_CTX_new();
	203
	204	if (ctx == NULL)
	205	return NULL;
	206
	207	if (!ossl_bio_init_core(ctx, in)) {
	208	OSSL_LIB_CTX_free(ctx);
	209	return NULL;
	210	}
	211
	212	return ctx;
	213	}
	214
f12a5690 MC	215	OSSL_LIB_CTX OSSL_LIB_CTX_new_child(const OSSL_CORE_HANDLE handle,
	216	const OSSL_DISPATCH *in)
	217	{
	218	OSSL_LIB_CTX *ctx = OSSL_LIB_CTX_new_from_dispatch(handle, in);
	219
	220	if (ctx == NULL)
	221	return NULL;
	222
	223	if (!ossl_provider_init_as_child(ctx, handle, in)) {
	224	OSSL_LIB_CTX_free(ctx);
	225	return NULL;
	226	}
	227	ctx->ischild = 1;
	228
	229	return ctx;
	230	}
	231
b4250010	232	int OSSL_LIB_CTX_load_config(OSSL_LIB_CTX ctx, const char config_file)
22e27978	233	{
d8652be0	234	return CONF_modules_load_file_ex(ctx, config_file, NULL, 0) > 0;
22e27978 SL	235	}
	236	#endif
	237
b4250010	238	void OSSL_LIB_CTX_free(OSSL_LIB_CTX *ctx)
d64b6299	239	{
b4250010	240	if (ossl_lib_ctx_is_default(ctx))
5a975275 RL	241	return;
5a975275 RL	242
cad22202 MC	243	#ifndef FIPS_MODULE
	244	if (ctx->ischild)
	245	ossl_provider_deinit_child(ctx);
	246	#endif
5a975275	247	context_deinit(ctx);
d64b6299 RL	248	OPENSSL_free(ctx);
	249	}
	250
978e323a MC	251	#ifndef FIPS_MODULE
	252	OSSL_LIB_CTX *OSSL_LIB_CTX_get0_global_default(void)
	253	{
	254	if (!RUN_ONCE(&default_context_init, default_context_do_init))
	255	return NULL;
	256
	257	return &default_context_int;
	258	}
	259
b4250010	260	OSSL_LIB_CTX OSSL_LIB_CTX_set0_default(OSSL_LIB_CTX libctx)
5a975275	261	{
b4250010	262	OSSL_LIB_CTX *current_defctx;
5a975275	263
92b20fb8 MC	264	if ((current_defctx = get_default_context()) != NULL) {
	265	if (libctx != NULL)
	266	set_default_context(libctx);
5a975275	267	return current_defctx;
92b20fb8	268	}
5a975275 RL	269
	270	return NULL;
	271	}
978e323a	272	#endif
5a975275	273
b4250010	274	OSSL_LIB_CTX ossl_lib_ctx_get_concrete(OSSL_LIB_CTX ctx)
d4c051ce	275	{
f844f9eb	276	#ifndef FIPS_MODULE
5a975275 RL	277	if (ctx == NULL)
5a975275 RL	278	return get_default_context();
d4c051ce MC	279	#endif
	280	return ctx;
	281	}
	282
b4250010	283	int ossl_lib_ctx_is_default(OSSL_LIB_CTX *ctx)
6b1e5fa4	284	{
f844f9eb	285	#ifndef FIPS_MODULE
5a975275	286	if (ctx == NULL \|\| ctx == get_default_context())
6b1e5fa4	287	return 1;
cfbd76c1 RL	288	#endif
	289	return 0;
	290	}
	291
b4250010	292	int ossl_lib_ctx_is_global_default(OSSL_LIB_CTX *ctx)
cfbd76c1 RL	293	{
cfbd76c1 RL	294	#ifndef FIPS_MODULE
b4250010	295	if (ossl_lib_ctx_get_concrete(ctx) == &default_context_int)
cfbd76c1	296	return 1;
6b1e5fa4 MC	297	#endif
	298	return 0;
	299	}
	300
b4250010 DMSP	301	static void ossl_lib_ctx_generic_new(void parent_ign, void ptr_ign,
	302	CRYPTO_EX_DATA *ad, int index,
	303	long argl_ign, void *argp)
d64b6299	304	{
b4250010	305	const OSSL_LIB_CTX_METHOD *meth = argp;
e4bec869	306	OSSL_LIB_CTX *ctx = ossl_crypto_ex_data_get_ossl_lib_ctx(ad);
2c404214	307	void *ptr = meth->new_func(ctx);
d64b6299	308
2c404214	309	if (ptr != NULL) {
cd3f8c1b RS	310	if (!CRYPTO_THREAD_write_lock(ctx->lock))
	311	/*
	312	* Can't return something, so best to hope that something will
	313	* fail later. :(
	314	*/
	315	return;
d64b6299	316	CRYPTO_set_ex_data(ad, index, ptr);
2c404214 MC	317	CRYPTO_THREAD_unlock(ctx->lock);
2c404214 MC	318	}
d64b6299	319	}
b4250010 DMSP	320	static void ossl_lib_ctx_generic_free(void parent_ign, void ptr,
	321	CRYPTO_EX_DATA *ad, int index,
	322	long argl_ign, void *argp)
d64b6299	323	{
b4250010	324	const OSSL_LIB_CTX_METHOD *meth = argp;
d64b6299 RL	325
	326	meth->free_func(ptr);
	327	}
1aedc35f	328
b4250010 DMSP	329	static int ossl_lib_ctx_init_index(OSSL_LIB_CTX *ctx, int static_index,
b4250010 DMSP	330	const OSSL_LIB_CTX_METHOD *meth)
d64b6299	331	{
1aedc35f MC	332	int idx;
1aedc35f MC	333
b4250010	334	ctx = ossl_lib_ctx_get_concrete(ctx);
1aedc35f MC	335	if (ctx == NULL)
	336	return 0;
	337
e4bec869 SL	338	idx = ossl_crypto_get_ex_new_index_ex(ctx, CRYPTO_EX_INDEX_OSSL_LIB_CTX, 0,
	339	(void *)meth,
	340	ossl_lib_ctx_generic_new,
a16d2174 MC	341	NULL, ossl_lib_ctx_generic_free,
a16d2174 MC	342	meth->priority);
1aedc35f MC	343	if (idx < 0)
	344	return 0;
	345
	346	ctx->dyn_indexes[static_index] = idx;
	347	return 1;
d64b6299 RL	348	}
d64b6299 RL	349
b4250010 DMSP	350	void ossl_lib_ctx_get_data(OSSL_LIB_CTX ctx, int index,
b4250010 DMSP	351	const OSSL_LIB_CTX_METHOD *meth)
d64b6299 RL	352	{
d64b6299 RL	353	void *data = NULL;
770de346	354	int dynidx;
d64b6299	355
b4250010	356	ctx = ossl_lib_ctx_get_concrete(ctx);
b8fe36fe MC	357	if (ctx == NULL)
b8fe36fe MC	358	return NULL;
d64b6299	359
cd3f8c1b RS	360	if (!CRYPTO_THREAD_read_lock(ctx->lock))
cd3f8c1b RS	361	return NULL;
770de346 MC	362	dynidx = ctx->dyn_indexes[index];
	363	CRYPTO_THREAD_unlock(ctx->lock);
	364
	365	if (dynidx != -1) {
cd3f8c1b RS	366	if (!CRYPTO_THREAD_read_lock(ctx->index_locks[index]))
	367	return NULL;
	368	if (!CRYPTO_THREAD_read_lock(ctx->lock)) {
	369	CRYPTO_THREAD_unlock(ctx->index_locks[index]);
	370	return NULL;
	371	}
770de346	372	data = CRYPTO_get_ex_data(&ctx->data, dynidx);
04b9435a	373	CRYPTO_THREAD_unlock(ctx->lock);
770de346 MC	374	CRYPTO_THREAD_unlock(ctx->index_locks[index]);
	375	return data;
	376	}
d64b6299	377
cd3f8c1b RS	378	if (!CRYPTO_THREAD_write_lock(ctx->index_locks[index]))
	379	return NULL;
	380	if (!CRYPTO_THREAD_write_lock(ctx->lock)) {
	381	CRYPTO_THREAD_unlock(ctx->index_locks[index]);
	382	return NULL;
	383	}
770de346 MC	384
	385	dynidx = ctx->dyn_indexes[index];
	386	if (dynidx != -1) {
770de346	387	data = CRYPTO_get_ex_data(&ctx->data, dynidx);
04b9435a	388	CRYPTO_THREAD_unlock(ctx->lock);
770de346 MC	389	CRYPTO_THREAD_unlock(ctx->index_locks[index]);
	390	return data;
	391	}
	392
b4250010	393	if (!ossl_lib_ctx_init_index(ctx, index, meth)) {
1aedc35f	394	CRYPTO_THREAD_unlock(ctx->lock);
770de346	395	CRYPTO_THREAD_unlock(ctx->index_locks[index]);
1aedc35f MC	396	return NULL;
	397	}
	398
770de346 MC	399	CRYPTO_THREAD_unlock(ctx->lock);
770de346 MC	400
04b9435a MC	401	/*
	402	* The alloc call ensures there's a value there. We release the ctx->lock
	403	* for this, because the allocation itself may recursively call
	404	* ossl_lib_ctx_get_data for other indexes (never this one). The allocation
	405	* will itself aquire the ctx->lock when it actually comes to store the
	406	* allocated data (see ossl_lib_ctx_generic_new() above). We call
	407	* ossl_crypto_alloc_ex_data_intern() here instead of CRYPTO_alloc_ex_data().
	408	* They do the same thing except that the latter calls CRYPTO_get_ex_data()
	409	* as well - which we must not do without holding the ctx->lock.
	410	*/
	411	if (ossl_crypto_alloc_ex_data_intern(CRYPTO_EX_INDEX_OSSL_LIB_CTX, NULL,
	412	&ctx->data, ctx->dyn_indexes[index])) {
cd3f8c1b RS	413	if (!CRYPTO_THREAD_read_lock(ctx->lock))
cd3f8c1b RS	414	goto end;
1aedc35f	415	data = CRYPTO_get_ex_data(&ctx->data, ctx->dyn_indexes[index]);
04b9435a MC	416	CRYPTO_THREAD_unlock(ctx->lock);
04b9435a MC	417	}
d64b6299	418
cd3f8c1b	419	end:
770de346	420	CRYPTO_THREAD_unlock(ctx->index_locks[index]);
d64b6299 RL	421	return data;
	422	}
	423
b4250010	424	OSSL_EX_DATA_GLOBAL ossl_lib_ctx_get_ex_data_global(OSSL_LIB_CTX ctx)
1aedc35f	425	{
b4250010	426	ctx = ossl_lib_ctx_get_concrete(ctx);
1aedc35f MC	427	if (ctx == NULL)
	428	return NULL;
	429	return &ctx->global;
	430	}
	431
b4250010 DMSP	432	int ossl_lib_ctx_run_once(OSSL_LIB_CTX *ctx, unsigned int idx,
b4250010 DMSP	433	ossl_lib_ctx_run_once_fn run_once_fn)
b8fe36fe MC	434	{
	435	int done = 0, ret = 0;
	436
b4250010	437	ctx = ossl_lib_ctx_get_concrete(ctx);
b8fe36fe MC	438	if (ctx == NULL)
	439	return 0;
	440
cd3f8c1b RS	441	if (!CRYPTO_THREAD_read_lock(ctx->oncelock))
cd3f8c1b RS	442	return 0;
b8fe36fe MC	443	done = ctx->run_once_done[idx];
	444	if (done)
	445	ret = ctx->run_once_ret[idx];
1aedc35f	446	CRYPTO_THREAD_unlock(ctx->oncelock);
b8fe36fe MC	447
	448	if (done)
	449	return ret;
	450
cd3f8c1b RS	451	if (!CRYPTO_THREAD_write_lock(ctx->oncelock))
cd3f8c1b RS	452	return 0;
b8fe36fe MC	453	if (ctx->run_once_done[idx]) {
b8fe36fe MC	454	ret = ctx->run_once_ret[idx];
1aedc35f	455	CRYPTO_THREAD_unlock(ctx->oncelock);
b8fe36fe MC	456	return ret;
	457	}
	458
	459	ret = run_once_fn(ctx);
	460	ctx->run_once_done[idx] = 1;
	461	ctx->run_once_ret[idx] = ret;
1aedc35f	462	CRYPTO_THREAD_unlock(ctx->oncelock);
b8fe36fe MC	463
	464	return ret;
	465	}
	466
b4250010	467	int ossl_lib_ctx_onfree(OSSL_LIB_CTX *ctx, ossl_lib_ctx_onfree_fn onfreefn)
b8fe36fe	468	{
b4250010	469	struct ossl_lib_ctx_onfree_list_st *newonfree
b8fe36fe MC	470	= OPENSSL_malloc(sizeof(*newonfree));
	471
	472	if (newonfree == NULL)
	473	return 0;
	474
	475	newonfree->fn = onfreefn;
	476	newonfree->next = ctx->onfreelist;
	477	ctx->onfreelist = newonfree;
	478
	479	return 1;
	480	}
d6d42cda RL	481
	482	const char ossl_lib_ctx_get_descriptor(OSSL_LIB_CTX libctx)
	483	{
	484	#ifdef FIPS_MODULE
	485	return "FIPS internal library context";
	486	#else
	487	if (ossl_lib_ctx_is_global_default(libctx))
	488	return "Global default library context";
	489	if (ossl_lib_ctx_is_default(libctx))
	490	return "Thread-local default library context";
	491	return "Non-default library context";
	492	#endif
	493	}