296 lines
10 KiB
C
296 lines
10 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014, 2015 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU Affero General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License along with
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TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file taler-mint-httpd_deposit.c
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* @brief Handle /deposit requests; parses the POST and JSON and
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* verifies the coin signature before handing things off
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* to the database.
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* @author Florian Dold
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* @author Benedikt Mueller
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* @author Christian Grothoff
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*
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* TODO:
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* - missing 'wire' format check (well-formed SEPA-details) (#3624)
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* - ugly if-construction for deposit type
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*/
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#include "platform.h"
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#include <gnunet/gnunet_util_lib.h>
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#include <jansson.h>
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#include <microhttpd.h>
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#include <pthread.h>
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#include "taler_mintdb_plugin.h"
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#include "taler_signatures.h"
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#include "taler_util.h"
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#include "taler-mint-httpd_parsing.h"
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#include "taler-mint-httpd_db.h"
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#include "taler-mint-httpd_deposit.h"
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#include "taler-mint-httpd_responses.h"
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#include "taler-mint-httpd_keystate.h"
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/**
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* We have parsed the JSON information about the deposit, do some
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* basic sanity checks (especially that the signature on the coin is
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* valid, and that this type of coin exists) and then execute the
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* deposit.
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*
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* @param connection the MHD connection to handle
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* @param deposit information about the deposit
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* @return MHD result code
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*/
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static int
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verify_and_execute_deposit (struct MHD_Connection *connection,
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const struct TALER_MINTDB_Deposit *deposit)
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{
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struct TMH_KS_StateHandle *key_state;
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struct TALER_DepositRequestPS dr;
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struct TALER_MINTDB_DenominationKeyIssueInformation *dki;
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struct TALER_Amount fee_deposit;
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dr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_DEPOSIT);
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dr.purpose.size = htonl (sizeof (struct TALER_DepositRequestPS));
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dr.h_contract = deposit->h_contract;
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dr.h_wire = deposit->h_wire;
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dr.timestamp = GNUNET_TIME_absolute_hton (deposit->timestamp);
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dr.refund_deadline = GNUNET_TIME_absolute_hton (deposit->refund_deadline);
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dr.transaction_id = GNUNET_htonll (deposit->transaction_id);
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TALER_amount_hton (&dr.amount_with_fee,
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&deposit->amount_with_fee);
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TALER_amount_hton (&dr.deposit_fee,
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&deposit->deposit_fee);
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dr.merchant = deposit->merchant_pub;
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dr.coin_pub = deposit->coin.coin_pub;
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if (GNUNET_OK !=
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GNUNET_CRYPTO_ecdsa_verify (TALER_SIGNATURE_WALLET_COIN_DEPOSIT,
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&dr.purpose,
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&deposit->csig.ecdsa_signature,
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&deposit->coin.coin_pub.ecdsa_pub))
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{
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TALER_LOG_WARNING ("Invalid signature on /deposit request\n");
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return TMH_RESPONSE_reply_signature_invalid (connection,
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"coin_sig");
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}
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/* check denomination exists and is valid */
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key_state = TMH_KS_acquire ();
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dki = TMH_KS_denomination_key_lookup (key_state,
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&deposit->coin.denom_pub);
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if (NULL == dki)
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{
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TMH_KS_release (key_state);
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TALER_LOG_WARNING ("Unknown denomination key in /deposit request\n");
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return TMH_RESPONSE_reply_arg_unknown (connection,
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"denom_pub");
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}
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/* check coin signature */
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if (GNUNET_YES !=
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TALER_test_coin_valid (&deposit->coin))
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{
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TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
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TMH_KS_release (key_state);
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return TMH_RESPONSE_reply_signature_invalid (connection,
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"ub_sig");
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}
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TALER_amount_ntoh (&fee_deposit,
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&dki->issue.fee_deposit);
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if (TALER_amount_cmp (&fee_deposit,
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&deposit->amount_with_fee) < 0)
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{
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TMH_KS_release (key_state);
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return (MHD_YES ==
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TMH_RESPONSE_reply_external_error (connection,
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"deposited amount smaller than depositing fee"))
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? GNUNET_NO : GNUNET_SYSERR;
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}
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TMH_KS_release (key_state);
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return TMH_DB_execute_deposit (connection,
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deposit);
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}
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/**
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* Handle a "/deposit" request. This function parses the
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* JSON information and then calls #verify_and_execute_deposit()
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* to verify the signatures and execute the deposit.
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*
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* @param connection the MHD connection to handle
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* @param root root of the posted JSON
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* @param amount how much should be deposited
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* @param wire json describing the wire details (?)
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* @return MHD result code
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*/
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static int
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parse_and_handle_deposit_request (struct MHD_Connection *connection,
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const json_t *root,
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const struct TALER_Amount *amount,
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json_t *wire)
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{
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int res;
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struct TALER_MINTDB_Deposit deposit;
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char *wire_enc;
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size_t len;
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struct TALER_MINTDB_DenominationKeyIssueInformation *dki;
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struct TMH_KS_StateHandle *ks;
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struct TMH_PARSE_FieldSpecification spec[] = {
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TMH_PARSE_MEMBER_DENOMINATION_PUBLIC_KEY ("denom_pub", &deposit.coin.denom_pub),
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TMH_PARSE_MEMBER_DENOMINATION_SIGNATURE ("ub_sig", &deposit.coin.denom_sig),
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TMH_PARSE_MEMBER_FIXED ("coin_pub", &deposit.coin.coin_pub),
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TMH_PARSE_MEMBER_FIXED ("merchant_pub", &deposit.merchant_pub),
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TMH_PARSE_MEMBER_FIXED ("H_contract", &deposit.h_contract),
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TMH_PARSE_MEMBER_FIXED ("H_wire", &deposit.h_wire),
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TMH_PARSE_MEMBER_FIXED ("coin_sig", &deposit.csig),
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TMH_PARSE_MEMBER_FIXED ("transaction_id", &deposit.transaction_id),
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TMH_PARSE_MEMBER_TIME_ABS ("timestamp", &deposit.timestamp),
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TMH_PARSE_MEMBER_TIME_ABS ("refund_deadline", &deposit.refund_deadline),
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TMH_PARSE_MEMBER_END
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};
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memset (&deposit, 0, sizeof (deposit));
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res = TMH_PARSE_json_data (connection,
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root,
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spec);
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if (GNUNET_SYSERR == res)
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return MHD_NO; /* hard failure */
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if (GNUNET_NO == res)
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return MHD_YES; /* failure */
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if (GNUNET_YES !=
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TALER_json_validate_wireformat (TMH_expected_wire_format,
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wire))
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{
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TMH_PARSE_release_data (spec);
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return TMH_RESPONSE_reply_arg_unknown (connection,
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"wire");
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}
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if (NULL == (wire_enc = json_dumps (wire, JSON_COMPACT | JSON_SORT_KEYS)))
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{
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TALER_LOG_WARNING ("Failed to parse JSON wire format specification for /deposit request\n");
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TMH_PARSE_release_data (spec);
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return TMH_RESPONSE_reply_arg_invalid (connection,
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"wire");
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}
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len = strlen (wire_enc) + 1;
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GNUNET_CRYPTO_hash (wire_enc,
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len,
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&deposit.h_wire);
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GNUNET_free (wire_enc);
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ks = TMH_KS_acquire ();
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dki = TMH_KS_denomination_key_lookup (ks,
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&deposit.coin.denom_pub);
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if (NULL == dki)
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{
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TMH_KS_release (ks);
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TMH_PARSE_release_data (spec);
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return TMH_RESPONSE_reply_arg_unknown (connection,
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"denom_pub");
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}
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TALER_amount_ntoh (&deposit.deposit_fee,
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&dki->issue.fee_deposit);
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TMH_KS_release (ks);
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deposit.wire = wire;
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deposit.amount_with_fee = *amount;
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if (-1 == TALER_amount_cmp (&deposit.amount_with_fee,
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&deposit.deposit_fee))
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{
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/* Total amount smaller than fee, invalid */
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TMH_PARSE_release_data (spec);
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return TMH_RESPONSE_reply_arg_invalid (connection,
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"f");
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}
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res = verify_and_execute_deposit (connection,
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&deposit);
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TMH_PARSE_release_data (spec);
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return res;
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}
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/**
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* Handle a "/deposit" request. Parses the JSON in the post to find
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* the "type" (either DIRECT_DEPOSIT or INCREMENTAL_DEPOSIT), and, if
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* successful, passes the JSON data to
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* #parse_and_handle_deposit_request() to further check the details
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* of the operation specified in the "wire" field of the JSON data.
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* If everything checks out, this will ultimately lead to the
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* "/deposit" being executed, or rejected.
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*
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* @param rh context of the handler
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* @param connection the MHD connection to handle
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* @param[in,out] connection_cls the connection's closure (can be updated)
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* @param upload_data upload data
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* @param[in,out] upload_data_size number of bytes (left) in @a upload_data
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* @return MHD result code
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*/
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int
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TMH_DEPOSIT_handler_deposit (struct TMH_RequestHandler *rh,
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struct MHD_Connection *connection,
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void **connection_cls,
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const char *upload_data,
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size_t *upload_data_size)
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{
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json_t *json;
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json_t *wire;
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int res;
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struct TALER_Amount amount;
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json_t *f;
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res = TMH_PARSE_post_json (connection,
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connection_cls,
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upload_data,
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upload_data_size,
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&json);
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if (GNUNET_SYSERR == res)
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return MHD_NO;
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if ( (GNUNET_NO == res) || (NULL == json) )
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return MHD_YES;
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if (-1 == json_unpack (json,
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"{s:s, s:o, f:o}",
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"wire", &wire,
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"f", &f))
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{
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GNUNET_break_op (0);
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json_decref (json);
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return TMH_RESPONSE_reply_json_pack (connection,
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MHD_HTTP_BAD_REQUEST,
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"{s:s}",
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"error", "Bad format");
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}
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res = TMH_PARSE_amount_json (connection,
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f,
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&amount);
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json_decref (f);
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if (GNUNET_SYSERR == res)
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{
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json_decref (wire);
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json_decref (json);
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return MHD_NO;
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}
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if (GNUNET_NO == res)
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{
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json_decref (wire);
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json_decref (json);
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return MHD_YES;
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}
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res = parse_and_handle_deposit_request (connection,
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json,
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&amount,
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wire);
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json_decref (wire);
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json_decref (json);
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return res;
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}
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/* end of taler-mint-httpd_deposit.c */
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