/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 Inria and GNUnet e.V.
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, If not, see
*/
/**
* @file taler-exchange-httpd_deposit.c
* @brief Handle /deposit requests; parses the POST and JSON and
* verifies the coin signature before handing things off
* to the database.
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include
#include
#include "taler_json_lib.h"
#include "taler-exchange-httpd_parsing.h"
#include "taler-exchange-httpd_deposit.h"
#include "taler-exchange-httpd_responses.h"
#include "taler-exchange-httpd_keystate.h"
#include "taler-exchange-httpd_validation.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 deposit information about the deposit
* @return MHD result code
*/
static int
verify_and_execute_deposit (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_Deposit *deposit)
{
struct TMH_KS_StateHandle *key_state;
struct TALER_DepositRequestPS dr;
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
struct TALER_Amount fee_deposit;
dr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_DEPOSIT);
dr.purpose.size = htonl (sizeof (struct TALER_DepositRequestPS));
dr.h_contract = deposit->h_contract;
dr.h_wire = deposit->h_wire;
dr.timestamp = GNUNET_TIME_absolute_hton (deposit->timestamp);
dr.refund_deadline = GNUNET_TIME_absolute_hton (deposit->refund_deadline);
dr.transaction_id = GNUNET_htonll (deposit->transaction_id);
TALER_amount_hton (&dr.amount_with_fee,
&deposit->amount_with_fee);
TALER_amount_hton (&dr.deposit_fee,
&deposit->deposit_fee);
dr.merchant = deposit->merchant_pub;
dr.coin_pub = deposit->coin.coin_pub;
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_DEPOSIT,
&dr.purpose,
&deposit->csig.eddsa_signature,
&deposit->coin.coin_pub.eddsa_pub))
{
TALER_LOG_WARNING ("Invalid signature on /deposit request\n");
return TMH_RESPONSE_reply_signature_invalid (connection,
"coin_sig");
}
/* check denomination exists and is valid */
key_state = TMH_KS_acquire ();
dki = TMH_KS_denomination_key_lookup (key_state,
&deposit->coin.denom_pub,
TMH_KS_DKU_DEPOSIT);
if (NULL == dki)
{
TMH_KS_release (key_state);
TALER_LOG_WARNING ("Unknown denomination key in /deposit request\n");
return TMH_RESPONSE_reply_arg_unknown (connection,
"denom_pub");
}
/* check coin signature */
if (GNUNET_YES !=
TALER_test_coin_valid (&deposit->coin))
{
TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
TMH_KS_release (key_state);
return TMH_RESPONSE_reply_signature_invalid (connection,
"ub_sig");
}
TALER_amount_ntoh (&fee_deposit,
&dki->issue.properties.fee_deposit);
if (0 < TALER_amount_cmp (&fee_deposit,
&deposit->amount_with_fee))
{
TMH_KS_release (key_state);
return TMH_RESPONSE_reply_external_error (connection,
"deposited amount smaller than depositing fee");
}
TMH_KS_release (key_state);
return TMH_DB_execute_deposit (connection,
deposit);
}
/**
* Handle a "/deposit" request. Parses the JSON, and, if successful,
* passes the JSON data to #verify_and_execute_deposit() to further
* check the details of the operation specified. If everything checks
* out, this will ultimately lead to the "/deposit" being executed, or
* rejected.
*
* @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
TMH_DEPOSIT_handler_deposit (struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
json_t *json;
int res;
json_t *wire;
struct TALER_EXCHANGEDB_Deposit deposit;
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
struct TMH_KS_StateHandle *ks;
struct GNUNET_HashCode my_h_wire;
struct TALER_Amount amount;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_json ("wire", &wire),
TALER_JSON_spec_amount ("f", &amount),
TALER_JSON_spec_denomination_public_key ("denom_pub", &deposit.coin.denom_pub),
TALER_JSON_spec_denomination_signature ("ub_sig", &deposit.coin.denom_sig),
GNUNET_JSON_spec_fixed_auto ("coin_pub", &deposit.coin.coin_pub),
GNUNET_JSON_spec_fixed_auto ("merchant_pub", &deposit.merchant_pub),
GNUNET_JSON_spec_fixed_auto ("H_contract", &deposit.h_contract),
GNUNET_JSON_spec_fixed_auto ("H_wire", &deposit.h_wire),
GNUNET_JSON_spec_fixed_auto ("coin_sig", &deposit.csig),
GNUNET_JSON_spec_uint64 ("transaction_id", &deposit.transaction_id),
GNUNET_JSON_spec_absolute_time ("timestamp", &deposit.timestamp),
GNUNET_JSON_spec_absolute_time ("refund_deadline", &deposit.refund_deadline),
GNUNET_JSON_spec_absolute_time ("edate", &deposit.wire_deadline),
GNUNET_JSON_spec_end ()
};
res = TMH_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;
memset (&deposit, 0, sizeof (deposit));
res = TMH_PARSE_json_data (connection,
json,
spec);
json_decref (json);
if (GNUNET_SYSERR == res)
return MHD_NO; /* hard failure */
if (GNUNET_NO == res)
return MHD_YES; /* failure */
if (GNUNET_YES !=
TMH_json_validate_wireformat (wire,
GNUNET_NO))
{
GNUNET_JSON_parse_free (spec);
return TMH_RESPONSE_reply_arg_unknown (connection,
"wire");
}
if (GNUNET_OK !=
TALER_JSON_hash (wire,
&my_h_wire))
{
TALER_LOG_WARNING ("Failed to parse JSON wire format specification for /deposit request\n");
GNUNET_JSON_parse_free (spec);
return TMH_RESPONSE_reply_arg_invalid (connection,
"wire");
}
if (0 != memcmp (&deposit.h_wire,
&my_h_wire,
sizeof (struct GNUNET_HashCode)))
{
/* Client hashed contract differently than we did, reject */
GNUNET_JSON_parse_free (spec);
return TMH_RESPONSE_reply_arg_invalid (connection,
"H_wire");
}
ks = TMH_KS_acquire ();
dki = TMH_KS_denomination_key_lookup (ks,
&deposit.coin.denom_pub,
TMH_KS_DKU_DEPOSIT);
if (NULL == dki)
{
TMH_KS_release (ks);
GNUNET_JSON_parse_free (spec);
return TMH_RESPONSE_reply_arg_unknown (connection,
"denom_pub");
}
TALER_amount_ntoh (&deposit.deposit_fee,
&dki->issue.properties.fee_deposit);
TMH_KS_release (ks);
deposit.wire = wire;
deposit.amount_with_fee = amount;
if (-1 == TALER_amount_cmp (&deposit.amount_with_fee,
&deposit.deposit_fee))
{
/* Total amount smaller than fee, invalid */
GNUNET_JSON_parse_free (spec);
return TMH_RESPONSE_reply_arg_invalid (connection,
"f");
}
res = verify_and_execute_deposit (connection,
&deposit);
GNUNET_JSON_parse_free (spec);
return res;
}
/* end of taler-exchange-httpd_deposit.c */