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/*
This file is part of TALER
Copyright (C) 2021 Taler Systems SA
TALER 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, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-httpd_management_extensions.c
* @brief Handle request to POST /management/extensions
* @author Özgür Kesim
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <jansson.h>
#include <microhttpd.h>
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
#include "taler_signatures.h"
#include "taler-exchange-httpd_management.h"
#include "taler-exchange-httpd_responses.h"
#include "taler_extensions.h"
#include "taler_dbevents.h"
/**
* Extension carries the necessary data for a particular extension.
*
*/
struct Extension
{
enum TALER_Extension_Type type;
json_t *config;
};
/**
* Closure for the #set_extensions transaction
*/
struct SetExtensionsContext
{
uint32_t num_extensions;
struct Extension *extensions;
struct TALER_MasterSignatureP *extensions_sigs;
};
/**
* @brief verifies the signature a configuration with the offline master key.
*
* @param config configuration of an extension given as JSON object
* @param master_priv offline master public key of the exchange
* @param[out] master_sig signature
* @return GNUNET_OK on success, GNUNET_SYSERR otherwise
*/
static enum GNUNET_GenericReturnValue
config_verify (
const json_t *config,
const struct TALER_MasterPublicKeyP *master_pub,
const struct TALER_MasterSignatureP *master_sig
)
{
enum GNUNET_GenericReturnValue ret;
struct TALER_ExtensionConfigHash h_config;
ret = TALER_extension_config_hash (config, &h_config);
if (GNUNET_OK != ret)
{
GNUNET_break (0);
return ret;
}
return TALER_exchange_offline_extension_config_hash_verify (h_config,
master_pub,
master_sig);
}
/**
* Function implementing database transaction to set the configuration of
* extensions. It runs the transaction logic.
* - IF it returns a non-error code, the transaction logic MUST NOT queue a
* MHD response.
* - IF it returns an hard error, the transaction logic MUST queue a MHD
* response and set @a mhd_ret.
* - IF it returns the soft error code, the function MAY be called again to
* retry and MUST not queue a MHD response.
*
* @param cls closure with a `struct SetExtensionsContext`
* @param connection MHD request which triggered the transaction
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!)
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
set_extensions (void *cls,
struct MHD_Connection *connection,
MHD_RESULT *mhd_ret)
{
struct SetExtensionsContext *sec = cls;
/* save the configurations of all extensions */
for (uint32_t i = 0; i<sec->num_extensions; i++)
{
struct Extension *ext = &sec->extensions[i];
struct TALER_MasterSignatureP *sig = &sec->extensions_sigs[i];
enum GNUNET_DB_QueryStatus qs;
char *config;
/* Sanity check.
* TODO: replace with general API to retrieve the extension-handler
*/
if (0 > ext->type || TALER_Extension_Max <= ext->type)
{
GNUNET_break (0);
return GNUNET_DB_STATUS_HARD_ERROR;
}
config = json_dumps (ext->config, JSON_COMPACT | JSON_SORT_KEYS);
if (NULL == config)
{
GNUNET_break (0);
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_JSON_INVALID,
"convert configuration to string");
return GNUNET_DB_STATUS_HARD_ERROR;
}
qs = TEH_plugin->set_extension_config (
TEH_plugin->cls,
TEH_extensions[ext->type]->name,
config,
sig);
if (qs < 0)
{
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
return qs;
GNUNET_break (0);
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_STORE_FAILED,
"save extension configuration");
}
/* Success, trigger event */
{
enum TALER_Extension_Type *type = &sec->extensions[i].type;
struct GNUNET_DB_EventHeaderP ev = {
.size = htons (sizeof (ev)),
.type = htons (TALER_DBEVENT_EXCHANGE_EXTENSIONS_UPDATED)
};
TEH_plugin->event_notify (TEH_plugin->cls,
&ev,
type,
sizeof(*type));
}
}
return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT; /* only 'success', so >=0, matters here */
}
MHD_RESULT
TEH_handler_management_post_extensions (
struct MHD_Connection *connection,
const json_t *root)
{
struct SetExtensionsContext sec = {0};
json_t *extensions;
json_t *extensions_sigs;
struct GNUNET_JSON_Specification top_spec[] = {
GNUNET_JSON_spec_json ("extensions",
&extensions),
GNUNET_JSON_spec_json ("extensions_sigs",
&extensions_sigs),
GNUNET_JSON_spec_end ()
};
MHD_RESULT ret;
// Parse the top level json structure
{
enum GNUNET_GenericReturnValue res;
res = TALER_MHD_parse_json_data (connection,
root,
top_spec);
if (GNUNET_SYSERR == res)
return MHD_NO; /* hard failure */
if (GNUNET_NO == res)
return MHD_YES; /* failure */
}
// Ensure we have two arrays of the same size
if (! (json_is_array (extensions) &&
json_is_array (extensions_sigs)) )
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (top_spec);
return TALER_MHD_reply_with_error (
connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"array expected for extensions and extensions_sigs");
}
sec.num_extensions = json_array_size (extensions_sigs);
if (json_array_size (extensions) != sec.num_extensions)
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (top_spec);
return TALER_MHD_reply_with_error (
connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"arrays extensions and extensions_sigs are not of the same size");
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Received /management/extensions\n");
sec.extensions = GNUNET_new_array (sec.num_extensions,
struct Extension);
sec.extensions_sigs = GNUNET_new_array (sec.num_extensions,
struct TALER_MasterSignatureP);
// Now parse individual extensions and signatures from those arrays.
for (unsigned int i = 0; i<sec.num_extensions; i++)
{
// 1. parse the extension out of the json
enum GNUNET_GenericReturnValue res;
const struct TALER_Extension *extension;
const char *name;
struct GNUNET_JSON_Specification ext_spec[] = {
GNUNET_JSON_spec_string ("extension",
&name),
GNUNET_JSON_spec_json ("config",
&sec.extensions[i].config),
GNUNET_JSON_spec_end ()
};
res = TALER_MHD_parse_json_array (connection,
extensions,
ext_spec,
i,
-1);
if (GNUNET_SYSERR == res)
{
ret = MHD_NO; /* hard failure */
goto CLEANUP;
}
if (GNUNET_NO == res)
{
ret = MHD_YES;
goto CLEANUP;
}
/* 2. Make sure name refers to a supported extension */
if (GNUNET_OK != TALER_extension_get_by_name (name,
(const struct
TALER_Extension **)
TEH_extensions,
&extension))
{
ret = TALER_MHD_reply_with_error (
connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"invalid extension type");
goto CLEANUP;
}
sec.extensions[i].type = extension->type;
/* 3. Extract the signature out of the json array */
{
enum GNUNET_GenericReturnValue res;
struct GNUNET_JSON_Specification sig_spec[] = {
GNUNET_JSON_spec_fixed_auto (NULL,
&sec.extensions_sigs[i]),
GNUNET_JSON_spec_end ()
};
res = TALER_MHD_parse_json_array (connection,
extensions_sigs,
sig_spec,
i,
-1);
if (GNUNET_SYSERR == res)
{
ret = MHD_NO; /* hard failure */
goto CLEANUP;
}
if (GNUNET_NO == res)
{
ret = MHD_YES;
goto CLEANUP;
}
}
/* 4. Verify the signature of the config */
if (GNUNET_OK != config_verify (
sec.extensions[i].config,
&TEH_master_public_key,
&sec.extensions_sigs[i]))
{
ret = TALER_MHD_reply_with_error (
connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"invalid signature for extension");
goto CLEANUP;
}
/* 5. Make sure the config is sound */
if (GNUNET_OK != extension->test_config (sec.extensions[i].config))
{
GNUNET_JSON_parse_free (ext_spec);
ret = TALER_MHD_reply_with_error (
connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_GENERIC_PARAMETER_MALFORMED,
"invalid configuration for extension");
goto CLEANUP;
}
/* We have a validly signed JSON object for the extension.
* Increment its refcount and free the parser for the extension.
*/
json_incref (sec.extensions[i].config);
GNUNET_JSON_parse_free (ext_spec);
} /* for-loop */
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Received %u extensions\n",
sec.num_extensions);
// now run the transaction to persist the configurations
{
enum GNUNET_GenericReturnValue res;
res = TEH_DB_run_transaction (connection,
"set extensions",
TEH_MT_OTHER,
&ret,
&set_extensions,
&sec);
if (GNUNET_SYSERR == res)
goto CLEANUP;
}
ret = TALER_MHD_reply_static (
connection,
MHD_HTTP_NO_CONTENT,
NULL,
NULL,
0);
CLEANUP:
for (unsigned int i = 0; i < sec.num_extensions; i++)
{
if (NULL != sec.extensions[i].config)
{
json_decref (sec.extensions[i].config);
}
}
GNUNET_free (sec.extensions);
GNUNET_free (sec.extensions_sigs);
GNUNET_JSON_parse_free (top_spec);
return ret;
}
/* end of taler-exchange-httpd_management_management_post_extensions.c */
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