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exchange/src/mint/taler-mint-httpd_deposit.c

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/*
This file is part of TALER
(C) 2014 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 <http://www.gnu.org/licenses/>
*/
/**
* @file taler-mint-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
*
* TODO:
* - missing 'wire' format check (well-formed SEPA-details)
* - ugliy if-construction for deposit type
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include <microhttpd.h>
#include <libpq-fe.h>
#include <pthread.h>
#include "mint.h"
#include "mint_db.h"
#include "taler_signatures.h"
#include "taler_util.h"
#include "taler-mint-httpd_parsing.h"
#include "taler-mint-httpd_keys.h"
#include "taler-mint-httpd_db.h"
#include "taler-mint-httpd_deposit.h"
#include "taler-mint-httpd_responses.h"
#include "taler-mint-httpd_keystate.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 Deposit *deposit)
{
struct MintKeyState *key_state;
struct TALER_DepositRequest dr;
struct TALER_MINT_DenomKeyIssuePriv *dki;
dr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_DEPOSIT);
dr.purpose.size = htonl (sizeof (struct TALER_DepositRequest));
dr.h_contract = deposit->h_contract;
dr.h_wire = deposit->h_wire;
dr.transaction_id = GNUNET_htonll (deposit->transaction_id);
dr.amount = TALER_amount_hton (deposit->amount);
dr.coin_pub = deposit->coin.coin_pub;
if (GNUNET_OK !=
GNUNET_CRYPTO_ecdsa_verify (TALER_SIGNATURE_WALLET_DEPOSIT,
&dr.purpose,
&deposit->csig,
&deposit->coin.coin_pub))
{
LOG_WARNING ("Invalid signature on /deposit request\n");
return TALER_MINT_reply_arg_invalid (connection,
"csig");
}
/* check denomination exists and is valid */
key_state = TALER_MINT_key_state_acquire ();
dki = TALER_MINT_get_denom_key (key_state,
deposit->coin.denom_pub);
if (NULL == dki)
{
TALER_MINT_key_state_release (key_state);
LOG_WARNING ("Unknown denomination key in /deposit request\n");
return TALER_MINT_reply_arg_invalid (connection,
"denom_pub");
}
/* check coin signature */
if (GNUNET_YES !=
TALER_test_coin_valid (&deposit->coin))
{
LOG_WARNING ("Invalid coin passed for /deposit\n");
TALER_MINT_key_state_release (key_state);
return TALER_MINT_reply_coin_invalid (connection);
}
TALER_MINT_key_state_release (key_state);
return TALER_MINT_db_execute_deposit (connection,
deposit);
}
/**
* Handle a "/deposit" request. This function parses the
* JSON information and then calls #verify_and_execute_deposit()
* to verify the signatures and execute the deposit.
*
* @param connection the MHD connection to handle
* @param root root of the posted JSON
* @param amount how much should be deposited
* @param wire json describing the wire details (?)
* @return MHD result code
*/
static int
parse_and_handle_deposit_request (struct MHD_Connection *connection,
const json_t *root,
const struct TALER_Amount *amount,
const json_t *wire)
{
int res;
struct Deposit deposit;
char *wire_enc;
size_t len;
struct GNUNET_MINT_ParseFieldSpec spec[] = {
TALER_MINT_PARSE_RSA_PUBLIC_KEY ("denom_pub", &deposit.coin.denom_pub),
TALER_MINT_PARSE_RSA_SIGNATURE ("ubsig", &deposit.coin.denom_sig),
TALER_MINT_PARSE_FIXED ("coin_pub", &deposit.coin.coin_pub),
TALER_MINT_PARSE_FIXED ("merchant_pub", &deposit.merchant_pub),
TALER_MINT_PARSE_FIXED ("H_a", &deposit.h_contract),
TALER_MINT_PARSE_FIXED ("H_wire", &deposit.h_wire),
TALER_MINT_PARSE_FIXED ("csig", &deposit.csig),
TALER_MINT_PARSE_FIXED ("transaction_id", &deposit.transaction_id),
TALER_MINT_PARSE_END
};
memset (&deposit, 0, sizeof (deposit));
res = TALER_MINT_parse_json_data (connection,
root,
spec);
if (GNUNET_SYSERR == res)
return MHD_NO; /* hard failure */
if (GNUNET_NO == res)
return MHD_YES; /* failure */
/* FIXME: check that "wire" is formatted correctly */
if (NULL == (wire_enc = json_dumps (wire, JSON_COMPACT | JSON_SORT_KEYS)))
{
LOG_WARNING ("Failed to parse JSON wire format specification for /deposit request\n");
TALER_MINT_release_parsed_data (spec);
return TALER_MINT_reply_arg_invalid (connection,
"wire");
}
len = strlen (wire_enc) + 1;
GNUNET_CRYPTO_hash (wire_enc,
len,
&deposit.h_wire);
GNUNET_free (wire_enc);
deposit.wire = wire;
deposit.amount = *amount;
res = verify_and_execute_deposit (connection,
&deposit);
TALER_MINT_release_parsed_data (spec);
return res;
}
/**
* Handle a "/deposit" request. Parses the JSON in the post to find
* the "type" (either DIRECT_DEPOSIT or INCREMENTAL_DEPOSIT), and, if
* successful, passes the JSON data to
* #parse_and_handle_deposit_request() to further check the details
* of the operation specified in the "wire" field of the JSON data.
* 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
TALER_MINT_handler_deposit (struct RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
json_t *json;
json_t *wire;
int res;
struct TALER_Amount amount;
json_t *f;
res = TALER_MINT_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;
if (-1 == json_unpack (json,
"{s:s, s:o, f:o}",
"wire", &wire,
"f", &f))
{
GNUNET_break_op (0);
json_decref (json);
return TALER_MINT_reply_json_pack (connection,
MHD_HTTP_BAD_REQUEST,
"{s:s}",
"error", "Bad format");
}
res = TALER_MINT_parse_amount_json (connection,
f,
&amount);
json_decref (f);
if (GNUNET_SYSERR == res)
{
json_decref (wire);
json_decref (json);
return MHD_NO;
}
if (GNUNET_NO == res)
{
json_decref (wire);
json_decref (json);
return MHD_YES;
}
res = parse_and_handle_deposit_request (connection,
json,
&amount,
wire);
json_decref (wire);
json_decref (json);
return res;
}
/* end of taler-mint-httpd_deposit.c */
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