WIP: first steps towards age-withdraw, DOESN'T COMPILE YET
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@ -122,6 +122,8 @@ taler_exchange_wirewatch_LDADD = \
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taler_exchange_httpd_SOURCES = \
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taler_exchange_httpd_SOURCES = \
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taler-exchange-httpd.c taler-exchange-httpd.h \
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taler-exchange-httpd.c taler-exchange-httpd.h \
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taler-exchange-httpd_age-withdraw.c taler-exchange-httpd_age-withdraw.h \
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taler-exchange-httpd_age-withdraw_reveal.c taler-exchange-httpd_age-withdraw_reveal.h \
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taler-exchange-httpd_auditors.c taler-exchange-httpd_auditors.h \
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taler-exchange-httpd_auditors.c taler-exchange-httpd_auditors.h \
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taler-exchange-httpd_aml-decision.c taler-exchange-httpd_aml-decision.h \
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taler-exchange-httpd_aml-decision.c taler-exchange-httpd_aml-decision.h \
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taler-exchange-httpd_batch-deposit.c taler-exchange-httpd_batch-deposit.h \
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taler-exchange-httpd_batch-deposit.c taler-exchange-httpd_batch-deposit.h \
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385
src/exchange/taler-exchange-httpd_age-withdraw.c
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385
src/exchange/taler-exchange-httpd_age-withdraw.c
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@ -0,0 +1,385 @@
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/*
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This file is part of TALER
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Copyright (C) 2023 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation; either version 3,
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or (at your option) any later version.
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TALER is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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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
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Public License along with TALER; see the file COPYING. If not,
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see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file taler-exchange-httpd_age-withdraw.c
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* @brief Handle /reserves/$RESERVE_PUB/age-withdraw requests
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* @author Özgür Kesim
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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 "taler_json_lib.h"
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#include "taler_kyclogic_lib.h"
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#include "taler_mhd_lib.h"
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#include "taler-exchange-httpd_withdraw.h"
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#include "taler-exchange-httpd_responses.h"
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#include "taler-exchange-httpd_keys.h"
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/**
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* Context for #age_withdraw_transaction.
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*/
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struct AgeWithdrawContext
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{
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/**
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* KYC status for the operation.
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*/
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struct TALER_EXCHANGEDB_KycStatus kyc;
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/**
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* The commitment request, for n*kappa coins.
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*/
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struct TALER_EXCHANGEDB_AgeWithdrawCommitment commitment;
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/**
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* Current time for the DB transaction.
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*/
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struct GNUNET_TIME_Timestamp now;
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};
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#if 0
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/**
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* Function called to iterate over KYC-relevant
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* transaction amounts for a particular time range.
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* Called within a database transaction, so must
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* not start a new one.
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*
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* @param cls closure, identifies the event type and
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* account to iterate over events for
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* @param limit maximum time-range for which events
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* should be fetched (timestamp in the past)
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* @param cb function to call on each event found,
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* events must be returned in reverse chronological
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* order
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* @param cb_cls closure for @a cb
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*/
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static void
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withdraw_amount_cb (void *cls,
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struct GNUNET_TIME_Absolute limit,
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TALER_EXCHANGEDB_KycAmountCallback cb,
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void *cb_cls)
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{
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struct AgeWithdrawContext *awc = cls;
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enum GNUNET_DB_QueryStatus qs;
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GNUNET_log (GNUNET_ERROR_TYPE_INFO,
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"Signaling amount %s for KYC check during age-withdrawal\n",
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TALER_amount2s (&awc->amount_with_fee));
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if (GNUNET_OK !=
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cb (cb_cls,
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&awc->amount_with_fee,
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awc->now.abs_time))
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return;
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qs = TEH_plugin->select_withdraw_amounts_for_kyc_check (
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TEH_plugin->cls,
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&wc->h_payto,
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limit,
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cb,
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cb_cls);
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GNUNET_log (GNUNET_ERROR_TYPE_INFO,
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"Got %d additional transactions for this age-withdrawal and limit %llu\n",
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qs,
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(unsigned long long) limit.abs_value_us);
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GNUNET_break (qs >= 0);
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}
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#endif
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#if 0
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/**
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* TODO: REWRITE
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* Function implementing age withdraw transaction. Runs the
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* transaction logic; IF it returns a non-error code, the transaction
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* logic MUST NOT queue a MHD response. IF it returns an hard error,
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* the transaction logic MUST queue a MHD response and set @a mhd_ret.
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* IF it returns the soft error code, the function MAY be called again
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* to retry and MUST not queue a MHD response.
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*
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* Note that "wc->collectable.sig" is set before entering this function as we
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* signed before entering the transaction.
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*
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* @param cls a `struct WithdrawContext *`
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* @param connection MHD request which triggered the transaction
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* @param[out] mhd_ret set to MHD response status for @a connection,
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* if transaction failed (!)
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* @return transaction status
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*/
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static enum GNUNET_DB_QueryStatus
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age_withdraw_transaction (void *cls,
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struct MHD_Connection *connection,
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MHD_RESULT *mhd_ret)
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{
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struct AgeWithdrawContext *wc = cls;
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enum GNUNET_DB_QueryStatus qs;
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bool found = false;
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bool balance_ok = false;
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bool nonce_ok = false;
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uint64_t ruuid;
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const struct TALER_CsNonce *nonce;
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const struct TALER_BlindedPlanchet *bp;
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wc->now = GNUNET_TIME_timestamp_get ();
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qs = TEH_plugin->reserves_get_origin (TEH_plugin->cls,
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&wc->collectable.reserve_pub,
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&wc->h_payto);
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if (qs < 0)
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return qs;
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/* If no results, reserve was created by merge,
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in which case no KYC check is required as the
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merge already did that. */
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if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
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{
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const char *kyc_required;
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kyc_required = TALER_KYCLOGIC_kyc_test_required (
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TALER_KYCLOGIC_KYC_TRIGGER_WITHDRAW,
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&wc->h_payto,
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TEH_plugin->select_satisfied_kyc_processes,
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TEH_plugin->cls,
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&withdraw_amount_cb,
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wc);
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if (NULL != kyc_required)
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{
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/* insert KYC requirement into DB! */
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wc->kyc.ok = false;
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return TEH_plugin->insert_kyc_requirement_for_account (
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TEH_plugin->cls,
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kyc_required,
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&wc->h_payto,
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&wc->kyc.requirement_row);
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}
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}
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wc->kyc.ok = true;
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bp = &wc->blinded_planchet;
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nonce = (TALER_DENOMINATION_CS == bp->cipher)
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? &bp->details.cs_blinded_planchet.nonce
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: NULL;
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qs = TEH_plugin->do_withdraw (TEH_plugin->cls,
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nonce,
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&wc->collectable,
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wc->now,
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&found,
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&balance_ok,
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&nonce_ok,
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&ruuid);
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if (0 > qs)
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{
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if (GNUNET_DB_STATUS_HARD_ERROR == qs)
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_FETCH_FAILED,
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"do_withdraw");
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return qs;
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}
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if (! found)
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{
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_NOT_FOUND,
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TALER_EC_EXCHANGE_GENERIC_RESERVE_UNKNOWN,
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NULL);
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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if (! balance_ok)
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{
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TEH_plugin->rollback (TEH_plugin->cls);
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*mhd_ret = TEH_RESPONSE_reply_reserve_insufficient_balance (
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connection,
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TALER_EC_EXCHANGE_WITHDRAW_INSUFFICIENT_FUNDS,
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&wc->collectable.amount_with_fee,
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&wc->collectable.reserve_pub);
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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if (! nonce_ok)
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{
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TEH_plugin->rollback (TEH_plugin->cls);
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_CONFLICT,
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TALER_EC_EXCHANGE_WITHDRAW_NONCE_REUSE,
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NULL);
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
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TEH_METRICS_num_success[TEH_MT_SUCCESS_WITHDRAW]++;
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return qs;
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}
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#endif
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/**
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* Check if the @a rc is replayed and we already have an
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* answer. If so, replay the existing answer and return the
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* HTTP response.
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*
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* @param rc request context
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* @param[in,out] awc parsed request data
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* @param[out] mret HTTP status, set if we return true
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* @return true if the request is idempotent with an existing request
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* false if we did not find the request in the DB and did not set @a mret
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*/
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static bool
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request_is_idempotent (struct TEH_RequestContext *rc,
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struct AgeWithdrawContext *awc,
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MHD_RESULT *mret)
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{
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enum GNUNET_DB_QueryStatus qs;
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qs = TEH_plugin->get_age_withdraw_info (TEH_plugin->cls,
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&awc->reserve_pub,
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&awc->commitment);
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if (0 > qs)
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{
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GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
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if (GNUNET_DB_STATUS_HARD_ERROR == qs)
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*mret = TALER_MHD_reply_with_error (rc->connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_FETCH_FAILED,
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"get_age_withdraw_info");
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return true; /* well, kind-of */
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}
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if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
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return false;
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/* generate idempotent reply */
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TEH_METRICS_num_requests[TEH_MT_REQUEST_IDEMPOTENT_AGE_WITHDRAW]++;
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*mret = TALER_MHD_REPLY_JSON_PACK (
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rc->connection,
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MHD_HTTP_OK,
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GNUNET_JSON_pack_uint64 ("noreveal_index",
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&awc->commitment.noreveal_index),
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GNUNET_JSON_pack_data_auto ("exchange_sig",
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&awc->commitment.sig),
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GNUNET_JSON_pack_data_auto ("exchange_pub",
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/* TODO:oec: where does the pub come from? */
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&pub));
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return true;
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}
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MHD_RESULT
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TEH_handler_age_withdraw (struct TEH_RequestContext *rc,
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const struct TALER_ReservePublicKeyP *reserve_pub,
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const json_t *root)
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{
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struct AgeWithdrawContext awc;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_fixed_auto ("reserve_sig",
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&awc.commitment.reserve_sig),
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GNUNET_JSON_spec_fixed_auto ("age_restricted_coins_commitment",
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&awc.commitment.h_commitment),
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TALER_JSON_spec_amount ("amount",
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&awc.commitment.amount_with_fee);
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GNUNET_JSON_spec_uint8 ("max_age_group",
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&awc.commitment.max_age_group),
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GNUNET_JSON_spec_end ()
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};
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enum TALER_ErrorCode ec;
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memset (&awc, 0, sizeof (awc));
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awc.commitment.reserve_pub = *reserve_pub;
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{
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enum GNUNET_GenericReturnValue res;
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res = TALER_MHD_parse_json_data (rc->connection,
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root,
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spec);
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if (GNUNET_OK != res)
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return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
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}
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if (request_is_idempotent (rc,
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&awc,
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&mret))
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{
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GNUNET_JSON_parse_free (spec);
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return mret;
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}
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TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_EDDSA]++;
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if (GNUNET_OK !=
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TALER_wallet_age_withdraw_verify (&awc.commitment.h_commitment,
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&awc.commitment.amount_with_fee,
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&awc.commitment.max_age_group,
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&awc.commitment.reserve_pub,
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&awc.commitment.reserve_sig))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return TALER_MHD_reply_with_error (rc->connection,
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MHD_HTTP_FORBIDDEN,
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TALER_EC_EXCHANGE_WITHDRAW_RESERVE_SIGNATURE_INVALID,
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NULL);
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}
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/* run transaction */
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{
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MHD_RESULT mhd_ret;
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if (GNUNET_OK !=
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TEH_DB_run_transaction (rc->connection,
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"run age withdraw",
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TEH_MT_REQUEST_AGE_WITHDRAW,
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&mhd_ret,
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&age_withdraw_transaction,
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&awc))
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{
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/* Even if #withdraw_transaction() failed, it may have created a signature
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(or we might have done it optimistically above). */
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/*TODO:oec:which function to call here!? */
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TALER_blinded_denom_sig_free (&awc.commitment.sig);
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GNUNET_JSON_parse_free (spec);
|
||||||
|
return mhd_ret;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Clean up and send back final response */
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
|
||||||
|
if (! awc.kyc.ok)
|
||||||
|
return TEH_RESPONSE_reply_kyc_required (rc->connection,
|
||||||
|
&awc.h_payto,
|
||||||
|
&awc.kyc);
|
||||||
|
{
|
||||||
|
MHD_RESULT ret;
|
||||||
|
|
||||||
|
ret = TALER_MHD_REPLY_JSON_PACK (
|
||||||
|
rc->connection,
|
||||||
|
MHD_HTTP_OK,
|
||||||
|
/* TODO:oec: put in the right answer fields */
|
||||||
|
GNUNET_JSON_pack_uint64 ("noreveal_index",
|
||||||
|
&awc->commitment.noreveal_index),
|
||||||
|
GNUNET_JSON_pack_data_auto ("exchange_sig",
|
||||||
|
&awc->commitment.sig),
|
||||||
|
GNUNET_JSON_pack_data_auto ("exchange_pub",
|
||||||
|
/* TODO:oec: where does the pub come from? */
|
||||||
|
&pub));
|
||||||
|
TALER_blinded_denom_sig_free (&awc.commitment.sig);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/* end of taler-exchange-httpd_age-withdraw.c */
|
||||||
47
src/exchange/taler-exchange-httpd_age-withdraw.h
Normal file
47
src/exchange/taler-exchange-httpd_age-withdraw.h
Normal file
@ -0,0 +1,47 @@
|
|||||||
|
/*
|
||||||
|
This file is part of TALER
|
||||||
|
Copyright (C) 2023 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-exchange-httpd_age-withdraw.h
|
||||||
|
* @brief Handle /reserve/$RESERVE_PUB/age-withdraw requests
|
||||||
|
* @author Özgür Kesim
|
||||||
|
*/
|
||||||
|
#ifndef TALER_EXCHANGE_HTTPD_AGE_WITHDRAW_H
|
||||||
|
#define TALER_EXCHANGE_HTTPD_AGE_WITHDRAW_H
|
||||||
|
|
||||||
|
#include <microhttpd.h>
|
||||||
|
#include "taler-exchange-httpd.h"
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Handle a "/reserves/$RESERVE_PUB/age-withdraw" request.
|
||||||
|
*
|
||||||
|
* Parses the batch of commitments to withdraw age restricted coins, and checks
|
||||||
|
* that the signature "reserve_sig" makes this a valid withdrawal request from
|
||||||
|
* the specified reserve. If the request is valid, the response contains a
|
||||||
|
* noreveal_index which the client has to use for the subsequent call to
|
||||||
|
* /age-withdraw/$ACH/reveal.
|
||||||
|
*
|
||||||
|
* @param rc request context
|
||||||
|
* @param root uploaded JSON data
|
||||||
|
* @param reserve_pub public key of the reserve
|
||||||
|
* @return MHD result code
|
||||||
|
*/
|
||||||
|
MHD_RESULT
|
||||||
|
TEH_handler_age_withdraw (struct TEH_RequestContext *rc,
|
||||||
|
const struct TALER_ReservePublicKeyP *reserve_pub,
|
||||||
|
const json_t *root);
|
||||||
|
|
||||||
|
#endif
|
||||||
56
src/exchange/taler-exchange-httpd_age-withdraw_reveal.h
Normal file
56
src/exchange/taler-exchange-httpd_age-withdraw_reveal.h
Normal file
@ -0,0 +1,56 @@
|
|||||||
|
/*
|
||||||
|
This file is part of TALER
|
||||||
|
Copyright (C) 2023 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-exchange-httpd_age-withdraw_reveal.h
|
||||||
|
* @brief Handle /age-withdraw/$ACH/reveal requests
|
||||||
|
* @author Özgür Kesim
|
||||||
|
*/
|
||||||
|
#ifndef TALER_EXCHANGE_HTTPD_AGE_WITHDRAW_H
|
||||||
|
#define TALER_EXCHANGE_HTTPD_AGE_WITHDRAW_H
|
||||||
|
|
||||||
|
#include <microhttpd.h>
|
||||||
|
#include "taler-exchange-httpd.h"
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Handle a "/age-withdraw/$ACH/reveal" request.
|
||||||
|
*
|
||||||
|
* The client got a noreveal_index in response to a previous request
|
||||||
|
* /reserve/$RESERVE_PUB/age-withdraw. It now has to reveal all n*(kappa-1)
|
||||||
|
* coin's private keys (except for the noreveal_index), from which all other
|
||||||
|
* coin-relevant data (blinding, age restriction, nonce) is derived from.
|
||||||
|
*
|
||||||
|
* The exchange computes those values, ensures that the maximum age is
|
||||||
|
* correctly applied, calculates the hash of the blinded envelopes, and -
|
||||||
|
* together with the non-disclosed blinded envelopes - compares the hash of
|
||||||
|
* those against the original commitment $ACH.
|
||||||
|
*
|
||||||
|
* If all those checks and the used denominations turn out to be correct, the
|
||||||
|
* exchange signs all blinded envelopes with their appropriate denomination
|
||||||
|
* keys.
|
||||||
|
*
|
||||||
|
* @param rc request context
|
||||||
|
* @param root uploaded JSON data
|
||||||
|
* @param ach commitment to the age restricted coints from the age-withdraw request
|
||||||
|
* @return MHD result code
|
||||||
|
*/
|
||||||
|
MHD_RESULT
|
||||||
|
TEH_handler_age_withdraw_reveal (
|
||||||
|
struct TEH_RequestContext *rc,
|
||||||
|
const struct TALER_AgeRestrictedCoinsCommitmentP *ach,
|
||||||
|
const json_t *root);
|
||||||
|
|
||||||
|
#endif
|
||||||
@ -1050,6 +1050,52 @@ struct TALER_EXCHANGEDB_CollectableBlindcoin
|
|||||||
struct TALER_ReserveSignatureP reserve_sig;
|
struct TALER_ReserveSignatureP reserve_sig;
|
||||||
};
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @brief Information we keep for an age-withdraw commitment
|
||||||
|
* to reproduce the /age-withdraw operation if neede, and to have proof
|
||||||
|
* that a reserve was drained by this amount.
|
||||||
|
*/
|
||||||
|
struct TALER_EXCHANGEDB_AgeWithdrawCommitment
|
||||||
|
{
|
||||||
|
/**
|
||||||
|
* Total amount (with fee) committed to withdraw
|
||||||
|
*/
|
||||||
|
struct TALER_Amount amount_with_fee;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Public key of the reserve that was drained.
|
||||||
|
*/
|
||||||
|
struct TALER_ReservePublicKeyP reserve_pub;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Maximum age group that the coins are restricted to.
|
||||||
|
*/
|
||||||
|
uint8_t max_age_group;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The hash of the commitment of all n*kappa coins
|
||||||
|
*/
|
||||||
|
struct TALER_AgeWithdrawCommitmentHashP h_commitment;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Index (smaller #TALER_CNC_KAPPA) which the exchange has chosen to not have
|
||||||
|
* revealed during cut and choose. This value applies to all n coins in the
|
||||||
|
* commitment.
|
||||||
|
*/
|
||||||
|
uint32_t noreveal_index;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Signature confirming the age withdrawal, matching @e reserve_pub, @e
|
||||||
|
* maximum_age_group and @e h_commitment and @e total_amount_with_fee.
|
||||||
|
*/
|
||||||
|
struct TALER_ReserveSignatureP reserve_sig;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The exchange's signature of the response.
|
||||||
|
*/
|
||||||
|
struct TALER_ExchangeSignatureP sig;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Information the exchange records about a recoup request
|
* Information the exchange records about a recoup request
|
||||||
|
|||||||
@ -359,6 +359,8 @@ TALER_exchange_online_melt_confirmation_verify (
|
|||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/* TODO:oec: add signature for age-withdraw and reveal */
|
||||||
|
|
||||||
GNUNET_NETWORK_STRUCT_BEGIN
|
GNUNET_NETWORK_STRUCT_BEGIN
|
||||||
|
|
||||||
/**
|
/**
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user