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/*
This file is part of GNUnet.
Copyright (C) 2020 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @author Johannes Späth
* @file escrow/escrow_api.c
*
* @brief api to interact with the escrow component
*/
#include "gnunet_util_lib.h"
#include "gnunet_escrow_lib.h"
#include "gnunet_escrow_plugin.h"
/**
* Init canary for the plaintext plugin
*/
static int plaintext_initialized;
/**
* Init canary for the GNS plugin
*/
static int gns_initialized;
/**
* Init canary for the Anastasis plugin
*/
static int anastasis_initialized;
/**
* Pointer to the plaintext plugin API
*/
static struct GNUNET_ESCROW_KeyPluginFunctions *plaintext_api;
/**
* Pointer to the GNS plugin API
*/
static struct GNUNET_ESCROW_KeyPluginFunctions *gns_api;
/**
* Pointer to the Anastasis plugin API
*/
static struct GNUNET_ESCROW_KeyPluginFunctions *anastasis_api;
/**
* Initialize an escrow plugin
*
* @param method the escrow method determining the plugin
*
* @return pointer to the escrow plugin API
*/
struct GNUNET_ESCROW_KeyPluginFunctions *
init_plugin (enum GNUNET_ESCROW_Key_Escrow_Method method)
{
switch (method)
{
case GNUNET_ESCROW_KEY_PLAINTEXT:
if (GNUNET_YES == plaintext_initialized)
return plaintext_api;
plaintext_initialized = GNUNET_YES;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Loading PLAINTEXT escrow plugin\n");
plaintext_api = GNUNET_PLUGIN_load ("libgnunet_plugin_escrow_plaintext",
NULL);
return plaintext_api;
case GNUNET_ESCROW_KEY_GNS:
if (GNUNET_YES == gns_initialized)
return gns_api;
gns_initialized = GNUNET_YES;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Loading GNS escrow plugin\n");
gns_api = GNUNET_PLUGIN_load ("libgnunet_plugin_escrow_gns",
NULL);
return gns_api;
case GNUNET_ESCROW_KEY_ANASTASIS:
if (GNUNET_YES == anastasis_initialized)
return anastasis_api;
anastasis_initialized = GNUNET_YES;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Loading ANASTASIS escrow plugin\n");
anastasis_api = GNUNET_PLUGIN_load ("libgnunet_plugin_escrow_anastasis",
NULL);
return anastasis_api;
}
// should never be reached
return NULL;
}
/**
* Unload all loaded plugins on destruction.
*/
void __attribute__ ((destructor))
GNUNET_ESCROW_fini_plugins ()
{
if (GNUNET_YES == plaintext_initialized)
{
plaintext_initialized = GNUNET_NO;
GNUNET_break (NULL ==
GNUNET_PLUGIN_unload ("libgnunet_plugin_escrow_plaintext",
plaintext_api));
plaintext_api = NULL;
}
if (GNUNET_YES == gns_initialized)
{
gns_initialized = GNUNET_NO;
GNUNET_break (NULL ==
GNUNET_PLUGIN_unload ("libgnunet_plugin_escrow_gns",
gns_api));
gns_api = NULL;
}
if (GNUNET_YES == anastasis_initialized)
{
anastasis_initialized = GNUNET_NO;
GNUNET_break (NULL ==
GNUNET_PLUGIN_unload ("libgnunet_plugin_escrow_anastasis",
anastasis_api));
anastasis_api = NULL;
}
}
/**
* Put some data in escrow using the specified escrow method
*
* @param ego the identity ego to put in escrow
* @param method the escrow method to use
*
* @return the escrow anchor needed to get the data back
*/
void *
GNUNET_ESCROW_put (const struct GNUNET_IDENTITY_Ego *ego,
enum GNUNET_ESCROW_Key_Escrow_Method method)
{
struct GNUNET_ESCROW_KeyPluginFunctions *api;
api = init_plugin (method);
return api->start_key_escrow (ego);
}
/**
* Renew the escrow of the data related to the given escrow anchor
*
* @param escrowAnchor the escrow anchor returned by the GNUNET_ESCROW_put method
* @param method the escrow method to use
*
* @return the escrow anchor needed to get the data back
*/
void *
GNUNET_ESCROW_renew (void *escrowAnchor,
enum GNUNET_ESCROW_Key_Escrow_Method method)
{
struct GNUNET_ESCROW_KeyPluginFunctions *api;
api = init_plugin (method);
return api->renew_key_escrow (escrowAnchor);
}
/**
* Get the escrowed data back
*
* @param escrowAnchor the escrow anchor returned by the GNUNET_ESCROW_put method
* @param egoName the name of the ego to get back
* @param method the escrow method to use
*
* @return a new identity ego restored from the escrow
*/
const struct GNUNET_IDENTITY_Ego *
GNUNET_ESCROW_get (void *escrowAnchor,
char *egoName,
enum GNUNET_ESCROW_Key_Escrow_Method method)
{
struct GNUNET_ESCROW_KeyPluginFunctions *api;
api = init_plugin (method);
return api->restore_key (escrowAnchor, egoName);
}
/**
* Verify the escrowed data
*
* @param ego the identity ego that was put into escrow
* @param escrowAnchor the escrow anchor returned by the GNUNET_ESCROW_put method
* @param method the escrow method to use
*
* @return GNUNET_ESCROW_VALID if the escrow could successfully by restored,
* GNUNET_ESCROW_RENEW_NEEDED if the escrow needs to be renewed,
* GNUNET_ESCROW_INVALID otherwise
*/
int
GNUNET_ESCROW_verify (const struct GNUNET_IDENTITY_Ego *ego,
void *escrowAnchor,
enum GNUNET_ESCROW_Key_Escrow_Method method)
{
struct GNUNET_ESCROW_KeyPluginFunctions *api;
api = init_plugin (method);
return api->verify_key_escrow (ego, escrowAnchor);
}
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