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/*
This file is part of TALER
Copyright (C) 2014-2020 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-auditor-httpd_deposit-confirmation.c
* @brief Handle /deposit-confirmation requests; parses the POST and JSON and
* verifies the coin signature before handing things off
* to the database.
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_json_lib.h>
#include <jansson.h>
#include <microhttpd.h>
#include <pthread.h>
#include "taler_json_lib.h"
#include "taler_mhd_lib.h"
#include "taler-auditor-httpd.h"
#include "taler-auditor-httpd_deposit-confirmation.h"
/**
* We have parsed the JSON information about the deposit, do some
* basic sanity checks (especially that the signature on the coin is
* valid, and that this type of coin exists) and then execute the
* deposit.
*
* @param connection the MHD connection to handle
* @param dc information about the deposit confirmation
* @param es information about the exchange's signing key
* @return MHD result code
*/
static int
verify_and_execute_deposit_confirmation (struct MHD_Connection *connection,
const struct
TALER_AUDITORDB_DepositConfirmation *dc,
const struct
TALER_AUDITORDB_ExchangeSigningKey *es)
{
struct TALER_ExchangeSigningKeyValidityPS skv;
struct TALER_DepositConfirmationPS dcs;
struct TALER_AUDITORDB_Session *session;
enum GNUNET_DB_QueryStatus qs;
struct GNUNET_TIME_Absolute now;
now = GNUNET_TIME_absolute_get ();
if ( (es->ep_start.abs_value_us > now.abs_value_us) ||
(es->ep_expire.abs_value_us < now.abs_value_us) )
{
/* Signing key expired */
TALER_LOG_WARNING ("Expired exchange signing key\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
"master_sig (expired)");
}
/* TODO (#6052): consider having an in-memory cache of already
verified exchange signing keys, this could save us
a signature check AND a database transaction per
operation. */
/* check exchange signing key signature */
skv.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY);
skv.purpose.size = htonl (sizeof (struct TALER_ExchangeSigningKeyValidityPS));
skv.master_public_key = es->master_public_key;
skv.start = GNUNET_TIME_absolute_hton (es->ep_start);
skv.expire = GNUNET_TIME_absolute_hton (es->ep_expire);
skv.end = GNUNET_TIME_absolute_hton (es->ep_end);
skv.signkey_pub = es->exchange_pub;
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY,
&skv.purpose,
&es->master_sig.eddsa_signature,
&es->master_public_key.eddsa_pub))
{
TALER_LOG_WARNING ("Invalid signature on exchange signing key\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
"master_sig");
}
session = TAH_plugin->get_session (TAH_plugin->cls);
if (NULL == session)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_DB_SETUP_FAILED,
"failed to establish session with database");
}
/* execute transaction */
qs = TAH_plugin->insert_exchange_signkey (TAH_plugin->cls,
session,
es);
if (0 > qs)
{
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
TALER_LOG_WARNING ("Failed to store exchange signing key in database\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_AUDITOR_EXCHANGE_STORE_DB_ERROR,
"failed to persist exchange signing key");
}
/* check deposit confirmation signature */
dcs.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT);
dcs.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS));
dcs.h_contract_terms = dc->h_contract_terms;
dcs.h_wire = dc->h_wire;
dcs.timestamp = GNUNET_TIME_absolute_hton (dc->timestamp);
dcs.refund_deadline = GNUNET_TIME_absolute_hton (dc->refund_deadline);
TALER_amount_hton (&dcs.amount_without_fee,
&dc->amount_without_fee);
dcs.coin_pub = dc->coin_pub;
dcs.merchant = dc->merchant;
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT,
&dcs.purpose,
&dc->exchange_sig.eddsa_signature,
&dc->exchange_pub.eddsa_pub))
{
TALER_LOG_WARNING ("Invalid signature on /deposit-confirmation request\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
"exchange_sig");
}
/* execute transaction */
qs = TAH_plugin->insert_deposit_confirmation (TAH_plugin->cls,
session,
dc);
if (0 > qs)
{
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
TALER_LOG_WARNING ("Failed to store /deposit-confirmation in database\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_DEPOSIT_CONFIRMATION_STORE_DB_ERROR,
"failed to persist deposit-confirmation data");
}
return TALER_MHD_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s}",
"status", "DEPOSIT_CONFIRMATION_OK");
}
/**
* Handle a "/deposit-confirmation" request. Parses the JSON, and, if
* successful, passes the JSON data to #verify_and_execute_deposit_confirmation()
* to further check the details of the operation specified. If
* everything checks out, this will ultimately lead to the "/deposit-confirmation"
* being stored in the database.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] connection_cls the connection's closure (can be updated)
* @param upload_data upload data
* @param[in,out] upload_data_size number of bytes (left) in @a upload_data
* @return MHD result code
*/
int
TAH_DEPOSIT_CONFIRMATION_handler (struct TAH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
json_t *json;
int res;
struct TALER_AUDITORDB_DepositConfirmation dc;
struct TALER_AUDITORDB_ExchangeSigningKey es;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("h_contract_terms", &dc.h_contract_terms),
GNUNET_JSON_spec_fixed_auto ("h_wire", &dc.h_wire),
GNUNET_JSON_spec_absolute_time ("timestamp", &dc.timestamp),
GNUNET_JSON_spec_absolute_time ("refund_deadline", &dc.refund_deadline),
TALER_JSON_spec_amount ("amount_without_fee", &dc.amount_without_fee),
GNUNET_JSON_spec_fixed_auto ("coin_pub", &dc.coin_pub),
GNUNET_JSON_spec_fixed_auto ("merchant_pub", &dc.merchant),
GNUNET_JSON_spec_fixed_auto ("exchange_sig", &dc.exchange_sig),
GNUNET_JSON_spec_fixed_auto ("exchange_pub", &dc.exchange_pub),
GNUNET_JSON_spec_fixed_auto ("master_pub", &es.master_public_key),
GNUNET_JSON_spec_absolute_time ("ep_start", &es.ep_start),
GNUNET_JSON_spec_absolute_time ("ep_expire", &es.ep_expire),
GNUNET_JSON_spec_absolute_time ("ep_end", &es.ep_end),
GNUNET_JSON_spec_fixed_auto ("master_sig", &es.master_sig),
GNUNET_JSON_spec_end ()
};
res = TALER_MHD_parse_post_json (connection,
connection_cls,
upload_data,
upload_data_size,
&json);
if (GNUNET_SYSERR == res)
return MHD_NO;
if ( (GNUNET_NO == res) ||
(NULL == json) )
return MHD_YES;
res = TALER_MHD_parse_json_data (connection,
json,
spec);
json_decref (json);
es.exchange_pub = dc.exchange_pub; /* used twice! */
dc.master_public_key = es.master_public_key;
if (GNUNET_SYSERR == res)
return MHD_NO; /* hard failure */
if (GNUNET_NO == res)
return MHD_YES; /* failure */
res = verify_and_execute_deposit_confirmation (connection,
&dc,
&es);
GNUNET_JSON_parse_free (spec);
return res;
}
/* end of taler-auditor-httpd_deposit-confirmation.c */
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