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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 <assert.h>
#include <openssl/crypto.h>
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/provider.h>
#include <openssl/evp.h>
#include "internal/provider.h"
#include "internal/cryptlib.h"
#include "crypto/evp.h"
DEFINE_STACK_OF(OSSL_PROVIDER)
struct child_prov_globals {
const OSSL_CORE_HANDLE *handle;
const OSSL_CORE_HANDLE *curr_prov;
unsigned int isinited:1;
CRYPTO_RWLOCK *lock;
OSSL_FUNC_core_get_libctx_fn *c_get_libctx;
OSSL_FUNC_provider_register_child_cb_fn *c_provider_register_child_cb;
OSSL_FUNC_provider_deregister_child_cb_fn *c_provider_deregister_child_cb;
OSSL_FUNC_provider_name_fn *c_prov_name;
OSSL_FUNC_provider_get0_provider_ctx_fn *c_prov_get0_provider_ctx;
OSSL_FUNC_provider_get0_dispatch_fn *c_prov_get0_dispatch;
OSSL_FUNC_provider_up_ref_fn *c_prov_up_ref;
OSSL_FUNC_provider_free_fn *c_prov_free;
};
static void *child_prov_ossl_ctx_new(OSSL_LIB_CTX *libctx)
{
return OPENSSL_zalloc(sizeof(struct child_prov_globals));
}
static void child_prov_ossl_ctx_free(void *vgbl)
{
struct child_prov_globals *gbl = vgbl;
gbl->c_provider_deregister_child_cb(gbl->handle);
CRYPTO_THREAD_lock_free(gbl->lock);
OPENSSL_free(gbl);
}
static const OSSL_LIB_CTX_METHOD child_prov_ossl_ctx_method = {
OSSL_LIB_CTX_METHOD_LOW_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(const OSSL_CORE_HANDLE *prov, void *cbdata)
{
OSSL_LIB_CTX *ctx = cbdata;
struct child_prov_globals *gbl;
const char *provname;
OSSL_PROVIDER *cprov;
int ret = 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 !gbl->isinited, then we are still initing and we already hold the
* lock - so don't take it again.
*/
if (gbl->isinited && !CRYPTO_THREAD_write_lock(gbl->lock))
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;
if ((cprov = ossl_provider_find(ctx, provname, 1)) != NULL) {
/*
* We free the newly created ref. We rely on the provider sticking around
* in the provider store.
*/
ossl_provider_free(cprov);
/*
* The provider already exists. It could be an unused built-in, or a
* previously created child, or it could have been explicitly loaded. If
* explicitly loaded it cannot be converted to a child and we ignore it
* - i.e. we don't start treating it like a child.
*/
if (!ossl_provider_convert_to_child(cprov, prov,
ossl_child_provider_init))
goto err;
} else {
/*
* 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)
goto err;
/*
* We free the newly created ref. We rely on the provider sticking around
* in the provider store.
*/
ossl_provider_free(cprov);
if (!ossl_provider_activate(cprov, 0, 0))
goto err;
if (!ossl_provider_set_child(cprov, prov)) {
ossl_provider_deactivate(cprov);
goto err;
}
}
ret = 1;
err:
if (gbl->isinited)
CRYPTO_THREAD_unlock(gbl->lock);
return ret;
}
static int provider_remove_child_cb(const OSSL_CORE_HANDLE *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);
cprov = ossl_provider_find(ctx, provname, 1);
if (cprov == NULL)
return 0;
/*
* ossl_provider_find ups the ref count, so we free it again here. We can
* rely on the provider store reference count.
*/
ossl_provider_free(cprov);
if (ossl_provider_is_child(cprov)
&& !ossl_provider_deactivate(cprov))
return 0;
return 1;
}
static int provider_global_props_cb(const char *props, void *cbdata)
{
OSSL_LIB_CTX *ctx = cbdata;
return evp_set_default_properties_int(ctx, props, 0, 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_PROVIDER_REGISTER_CHILD_CB:
gbl->c_provider_register_child_cb
= OSSL_FUNC_provider_register_child_cb(in);
break;
case OSSL_FUNC_PROVIDER_DEREGISTER_CHILD_CB:
gbl->c_provider_deregister_child_cb
= OSSL_FUNC_provider_deregister_child_cb(in);
break;
case OSSL_FUNC_PROVIDER_NAME:
gbl->c_prov_name = OSSL_FUNC_provider_name(in);
break;
case OSSL_FUNC_PROVIDER_GET0_PROVIDER_CTX:
gbl->c_prov_get0_provider_ctx
= OSSL_FUNC_provider_get0_provider_ctx(in);
break;
case OSSL_FUNC_PROVIDER_GET0_DISPATCH:
gbl->c_prov_get0_dispatch = OSSL_FUNC_provider_get0_dispatch(in);
break;
case OSSL_FUNC_PROVIDER_UP_REF:
gbl->c_prov_up_ref
= OSSL_FUNC_provider_up_ref(in);
break;
case OSSL_FUNC_PROVIDER_FREE:
gbl->c_prov_free = OSSL_FUNC_provider_free(in);
break;
default:
/* Just ignore anything we don't understand */
break;
}
}
if (gbl->c_get_libctx == NULL
|| gbl->c_provider_register_child_cb == NULL
|| gbl->c_prov_name == NULL
|| gbl->c_prov_get0_provider_ctx == NULL
|| gbl->c_prov_get0_dispatch == NULL
|| gbl->c_prov_up_ref == NULL
|| gbl->c_prov_free == NULL)
return 0;
gbl->lock = CRYPTO_THREAD_lock_new();
if (gbl->lock == NULL)
return 0;
if (!gbl->c_provider_register_child_cb(gbl->handle,
provider_create_child_cb,
provider_remove_child_cb,
provider_global_props_cb,
ctx))
return 0;
gbl->isinited = 1;
return 1;
}
int ossl_provider_up_ref_parent(OSSL_PROVIDER *prov, int activate)
{
struct child_prov_globals *gbl;
gbl = ossl_lib_ctx_get_data(ossl_provider_libctx(prov),
OSSL_LIB_CTX_CHILD_PROVIDER_INDEX,
&child_prov_ossl_ctx_method);
if (gbl == NULL)
return 0;
return gbl->c_prov_up_ref(ossl_provider_get_parent(prov), activate);
}
int ossl_provider_free_parent(OSSL_PROVIDER *prov, int deactivate)
{
struct child_prov_globals *gbl;
gbl
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