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/*
* 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 <openssl/crypto.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/provider.h>
#include "internal/provider.h"
#include "internal/cryptlib.h"
DEFINE_STACK_OF(OSSL_PROVIDER)
struct child_prov_globals {
const OSSL_CORE_HANDLE *handle;
OSSL_CORE_PROVIDER *curr_prov;
STACK_OF(OSSL_PROVIDER) *childprovs;
unsigned int isinited:1;
CRYPTO_RWLOCK *lock;
OSSL_FUNC_core_get_libctx_fn *c_get_libctx;
OSSL_FUNC_core_provider_do_all_fn *c_prov_do_all;
OSSL_FUNC_core_provider_name_fn *c_prov_name;
OSSL_FUNC_core_provider_get0_provider_ctx_fn *c_prov_get0_provider_ctx;
OSSL_FUNC_core_provider_get0_dispatch_fn *c_prov_get0_dispatch;
};
static void *child_prov_ossl_ctx_new(OSSL_LIB_CTX *libctx)
{
return OPENSSL_zalloc(sizeof(struct child_prov_globals));
}
/* Wrapper with a void return type for use with sk_OSSL_PROVIDER_pop_free */
static void ossl_prov_free(OSSL_PROVIDER *prov)
{
OSSL_PROVIDER_unload(prov);
}
static void child_prov_ossl_ctx_free(void *vgbl)
{
struct child_prov_globals *gbl = vgbl;
sk_OSSL_PROVIDER_pop_free(gbl->childprovs, ossl_prov_free);
CRYPTO_THREAD_lock_free(gbl->lock);
OPENSSL_free(gbl);
}
static const OSSL_LIB_CTX_METHOD child_prov_ossl_ctx_method = {
OSSL_LIB_CTX_METHOD_DEFAULT_PRIORITY,
child_prov_ossl_ctx_new,
child_prov_ossl_ctx_free,
};
static OSSL_provider_init_fn ossl_child_provider_init;
static int ossl_child_provider_init(const OSSL_CORE_HANDLE *handle,
const OSSL_DISPATCH *in,
const OSSL_DISPATCH **out,
void **provctx)
{
OSSL_FUNC_core_get_libctx_fn *c_get_libctx = NULL;
OSSL_LIB_CTX *ctx;
struct child_prov_globals *gbl;
for (; in->function_id != 0; in++) {
switch (in->function_id) {
case OSSL_FUNC_CORE_GET_LIBCTX:
c_get_libctx = OSSL_FUNC_core_get_libctx(in);
break;
default:
/* Just ignore anything we don't understand */
break;
}
}
if (c_get_libctx == NULL)
return 0;
/*
* We need an OSSL_LIB_CTX but c_get_libctx returns OPENSSL_CORE_CTX. We are
* a built-in provider and so we can get away with this cast. Normal
* providers can't do this.
*/
ctx = (OSSL_LIB_CTX *)c_get_libctx(handle);
gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX,
&child_prov_ossl_ctx_method);
if (gbl == NULL)
return 0;
*provctx = gbl->c_prov_get0_provider_ctx(gbl->curr_prov);
*out = gbl->c_prov_get0_dispatch(gbl->curr_prov);
return 1;
}
static int provider_create_child_cb(OSSL_CORE_PROVIDER *prov, void *cbdata)
{
OSSL_LIB_CTX *ctx = cbdata;
struct child_prov_globals *gbl;
const char *provname;
OSSL_PROVIDER *cprov;
gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX,
&child_prov_ossl_ctx_method);
if (gbl == NULL)
return 0;
provname = gbl->c_prov_name(prov);
/*
* We're operating under a lock so we can store the "current" provider in
* the global data.
*/
gbl->curr_prov = prov;
/*
* Create it - passing 1 as final param so we don't try and recursively init
* children
*/
if ((cprov = ossl_provider_new(ctx, provname, ossl_child_provider_init,
1)) == NULL)
return 0;
if (!ossl_provider_activate(cprov, 0)) {
ossl_provider_free(cprov);
return 0;
}
ossl_provider_set_child(cprov);
if (!sk_OSSL_PROVIDER_push(gbl->childprovs, cprov)) {
OSSL_PROVIDER_unload(cprov);
return 0;
}
return 1;
}
int ossl_provider_init_child_providers(OSSL_LIB_CTX *ctx)
{
struct child_prov_globals *gbl;
/* Should never happen */
if (ctx == NULL)
return 0;
gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX,
&child_prov_ossl_ctx_method);
if (gbl == NULL)
return 0;
if (!CRYPTO_THREAD_read_lock(gbl->lock))
return 0;
if (gbl->isinited) {
CRYPTO_THREAD_unlock(gbl->lock);
return 1;
}
CRYPTO_THREAD_unlock(gbl->lock);
if (!CRYPTO_THREAD_write_lock(gbl->lock))
return 0;
if (!gbl->isinited) {
if (!gbl->c_prov_do_all(gbl->c_get_libctx(gbl->handle),
provider_create_child_cb, ctx)) {
CRYPTO_THREAD_unlock(gbl->lock);
return 0;
}
gbl->isinited = 1;
}
CRYPTO_THREAD_unlock(gbl->lock);
return 1;
}
int ossl_provider_init_as_child(OSSL_LIB_CTX *ctx,
const OSSL_CORE_HANDLE *handle,
const OSSL_DISPATCH *in)
{
struct child_prov_globals *gbl;
if (ctx == NULL)
return 0;
gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX,
&child_prov_ossl_ctx_method);
if (gbl == NULL)
return 0;
gbl->handle = handle;
for (; in->function_id != 0; in++) {
switch (in->function_id) {
case OSSL_FUNC_CORE_GET_LIBCTX:
gbl->c_get_libctx = OSSL_FUNC_core_get_libctx(in);
break;
case OSSL_FUNC_CORE_PROVIDER_DO_ALL:
gbl->c_prov_do_all = OSSL_FUNC_core_provider_do_all(in);
break;
case OSSL_FUNC_CORE_PROVIDER_NAME:
gbl->c_prov_name = OSSL_FUNC_core_provider_name(in);
break;
case OSSL_FUNC_CORE_PROVIDER_GET0_PROVIDER_CTX:
gbl->c_prov_get0_provider_ctx
= OSSL_FUNC_core_provider_get0_provider_ctx(in);
break;
case OSSL_FUNC_CORE_PROVIDER_GET0_DISPATCH:
gbl->c_prov_get0_dispatch = OSSL_FUNC_core_provider_get0_dispatch(in);
break;
default:
/* Just ignore anything we don't understand */
break;
}
}
if (gbl->c_prov_do_all == NULL
|| gbl->c_prov_name == NULL
|| gbl->c_prov_get0_provider_ctx == NULL
|| gbl->c_prov_get0_dispatch == NULL)
return 0;
gbl->childprovs = sk_OSSL_PROVIDER_new_null();
if (gbl->childprovs == NULL)
return 0;
gbl->lock = CRYPTO_THREAD_lock_new();
if (gbl->lock == NULL)
return 0;
return 1;
}
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