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/*
This file is part of TALER
(C) 2014,2015 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_withdraw.c
* @brief Handle /withdraw/ requests
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include "taler-mint-httpd_withdraw.h"
#include "taler-mint-httpd_parsing.h"
#include "taler-mint-httpd_responses.h"
/**
* Handle a "/withdraw/status" request. Parses the
* given "reserve_pub" argument (which should contain the
* EdDSA public key of a reserve) and then respond with the
* status of the reserve.
*
* @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_withdraw_status (struct RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
struct GNUNET_CRYPTO_EddsaPublicKey reserve_pub;
int res;
res = TALER_MINT_mhd_request_arg_data (connection,
"reserve_pub",
&reserve_pub,
sizeof (struct GNUNET_CRYPTO_EddsaPublicKey));
if (GNUNET_SYSERR == res)
return MHD_NO; /* internal error */
if (GNUNET_NO == res)
return MHD_YES; /* parse error */
return TALER_MINT_db_execute_withdraw_status (connection,
&reserve_pub);
}
/**
* Handle a "/withdraw/sign" request. Parses the "reserve_pub"
* EdDSA key of the reserve and the requested "denom_pub" which
* specifies the key/value of the coin to be withdrawn, and checks
* that the signature "reserve_sig" makes this a valid withdrawl
* request from the specified reserve. If so, the envelope
* with the blinded coin "coin_ev" is passed down to execute the
* withdrawl operation.
*
* @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_withdraw_sign (struct RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
struct TALER_WithdrawRequest wsrd;
int res;
struct GNUNET_CRYPTO_rsa_PublicKey *denomination_pub;
char *denomination_pub_data;
size_t denomination_pub_data_size;
char *blinded_msg;
size_t blinded_msg_len;
struct GNUNET_CRYPTO_EddsaSignature signature;
res = TALER_MINT_mhd_request_arg_data (connection,
"reserve_pub",
&wsrd.reserve_pub,
sizeof (struct GNUNET_CRYPTO_EddsaPublicKey));
if (GNUNET_SYSERR == res)
return MHD_NO; /* internal error */
if (GNUNET_NO == res)
return MHD_YES; /* invalid request */
res = TALER_MINT_mhd_request_arg_data (connection,
"reserve_sig",
&signature,
sizeof (struct GNUNET_CRYPTO_EddsaSignature));
if (GNUNET_SYSERR == res)
return MHD_NO; /* internal error */
if (GNUNET_NO == res)
return MHD_YES; /* invalid request */
res = TALER_MINT_mhd_request_var_arg_data (connection,
"denom_pub",
(void **) &denomination_pub_data,
&denomination_pub_data_size);
if (GNUNET_SYSERR == res)
return MHD_NO; /* internal error */
if (GNUNET_NO == res)
return MHD_YES; /* invalid request */
res = TALER_MINT_mhd_request_var_arg_data (connection,
"coin_ev",
(void **) &blinded_msg,
&blinded_msg_len);
if (GNUNET_SYSERR == res)
{
GNUNET_free (denomination_pub_data);
return MHD_NO; /* internal error */
}
if (GNUNET_NO == res)
{
GNUNET_free (denomination_pub_data);
return MHD_YES; /* invalid request */
}
/* verify signature! */
wsrd.purpose.size = htonl (sizeof (struct TALER_WithdrawRequest));
wsrd.purpose.purpose = htonl (TALER_SIGNATURE_WITHDRAW);
GNUNET_CRYPTO_hash (denomination_pub_data,
denomination_pub_data_size,
&wsrd.h_denomination_pub);
GNUNET_CRYPTO_hash (blinded_msg,
blinded_msg_len,
&wsrd.h_coin_envelope);
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WITHDRAW,
&wsrd.purpose,
&signature,
&wsrd.reserve_pub))
{
LOG_WARNING ("Client supplied invalid signature for /withdraw/sign request\n");
GNUNET_free (denomination_pub_data);
GNUNET_free (blinded_msg);
return TALER_MINT_reply_arg_invalid (connection,
"reserve_sig");
}
denomination_pub = GNUNET_CRYPTO_rsa_public_key_decode (denomination_pub_data,
denomination_pub_data_size);
GNUNET_free (denomination_pub_data);
if (NULL == denomination_pub)
{
LOG_WARNING ("Client supplied ill-formed denomination public key for /withdraw/sign request\n");
GNUNET_free (blinded_msg);
return TALER_MINT_reply_arg_invalid (connection,
"denom_pub");
}
res = TALER_MINT_db_execute_withdraw_sign (connection,
&wsrd.reserve_pub,
denomination_pub,
blinded_msg,
blinded_msg_len,
&signature);
GNUNET_free (blinded_msg);
GNUNET_CRYPTO_rsa_public_key_free (denomination_pub);
return res;
}
/* end of taler-mint-httpd_withdraw.c */
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