405 lines
16 KiB
C
405 lines
16 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014-2018 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 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 General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file auditor-lib/auditor_api_deposit_confirmation.c
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* @brief Implementation of the /deposit request of the auditor's HTTP API
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <jansson.h>
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#include <microhttpd.h> /* just for HTTP status codes */
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_json_lib.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_json_lib.h"
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#include "taler_auditor_service.h"
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#include "auditor_api_handle.h"
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#include "taler_signatures.h"
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#include "auditor_api_curl_defaults.h"
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/**
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* @brief A DepositConfirmation Handle
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*/
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struct TALER_AUDITOR_DepositConfirmationHandle
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{
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/**
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* The connection to auditor this request handle will use
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*/
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struct TALER_AUDITOR_Handle *auditor;
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/**
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* The url for this request.
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*/
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char *url;
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/**
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* Context for #TEH_curl_easy_post(). Keeps the data that must
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* persist for Curl to make the upload.
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*/
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struct TEAH_PostContext ctx;
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/**
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* Handle for the request.
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*/
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struct GNUNET_CURL_Job *job;
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/**
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* Function to call with the result.
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*/
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TALER_AUDITOR_DepositConfirmationResultCallback cb;
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/**
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* Closure for @a cb.
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*/
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void *cb_cls;
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};
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/**
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* Function called when we're done processing the
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* HTTP /deposit-confirmation request.
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*
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* @param cls the `struct TALER_AUDITOR_DepositConfirmationHandle`
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* @param response_code HTTP response code, 0 on error
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* @param djson parsed JSON result, NULL on error
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*/
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static void
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handle_deposit_confirmation_finished (void *cls,
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long response_code,
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const void *djson)
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{
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const json_t *json = djson;
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struct TALER_AUDITOR_DepositConfirmationHandle *dh = cls;
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dh->job = NULL;
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switch (response_code)
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{
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case 0:
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break;
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case MHD_HTTP_OK:
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break;
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case MHD_HTTP_BAD_REQUEST:
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/* This should never happen, either us or the auditor is buggy
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(or API version conflict); just pass JSON reply to the application */
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break;
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case MHD_HTTP_FORBIDDEN:
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/* Nothing really to verify, auditor says one of the signatures is
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invalid; as we checked them, this should never happen, we
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should pass the JSON reply to the application */
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break;
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case MHD_HTTP_NOT_FOUND:
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/* Nothing really to verify, this should never
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happen, we should pass the JSON reply to the application */
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break;
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case MHD_HTTP_INTERNAL_SERVER_ERROR:
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/* Server had an internal issue; we should retry, but this API
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leaves this to the application */
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break;
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default:
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/* unexpected response code */
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u\n",
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(unsigned int) response_code);
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GNUNET_break (0);
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response_code = 0;
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break;
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}
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dh->cb (dh->cb_cls,
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response_code,
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TALER_JSON_get_error_code (json),
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json);
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TALER_AUDITOR_deposit_confirmation_cancel (dh);
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}
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/**
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* Verify signature information about the deposit-confirmation.
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*
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* @param h_wire hash of merchant wire details
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* @param h_contract_terms hash of the contact of the merchant with the customer (further details are never disclosed to the auditor)
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* @param timestamp timestamp when the contract was finalized, must not be too far in the future
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* @param refund_deadline date until which the merchant can issue a refund to the customer via the auditor (can be zero if refunds are not allowed); must not be after the @a wire_deadline
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* @param amount_without_fee the amount confirmed to be wired by the exchange to the merchant
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* @param coin_pub coin’s public key
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* @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
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* @param exchange_sig the signature made with purpose #TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT
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* @param exchange_pub the public key of the exchange that matches @a exchange_sig
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* @param master_pub master public key of the exchange
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* @param ep_start when does @a exchange_pub validity start
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* @param ep_expire when does @a exchange_pub usage end
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* @param ep_end when does @a exchange_pub legal validity end
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* @param master_sig master signature affirming validity of @a exchange_pub
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* @return #GNUNET_OK if signatures are OK, #GNUNET_SYSERR if not
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*/
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static int
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verify_signatures (const struct GNUNET_HashCode *h_wire,
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const struct GNUNET_HashCode *h_contract_terms,
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struct GNUNET_TIME_Absolute timestamp,
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struct GNUNET_TIME_Absolute refund_deadline,
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const struct TALER_Amount *amount_without_fee,
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const struct TALER_CoinSpendPublicKeyP *coin_pub,
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const struct TALER_MerchantPublicKeyP *merchant_pub,
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const struct TALER_ExchangePublicKeyP *exchange_pub,
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const struct TALER_ExchangeSignatureP *exchange_sig,
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const struct TALER_MasterPublicKeyP *master_pub,
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struct GNUNET_TIME_Absolute ep_start,
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struct GNUNET_TIME_Absolute ep_expire,
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struct GNUNET_TIME_Absolute ep_end,
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const struct TALER_MasterSignatureP *master_sig)
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{
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struct TALER_DepositConfirmationPS dc;
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struct TALER_ExchangeSigningKeyValidityPS sv;
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dc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT);
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dc.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS));
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dc.h_contract_terms = *h_contract_terms;
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dc.h_wire = *h_wire;
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dc.timestamp = GNUNET_TIME_absolute_hton (timestamp);
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dc.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline);
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TALER_amount_hton (&dc.amount_without_fee,
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amount_without_fee);
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dc.coin_pub = *coin_pub;
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dc.merchant = *merchant_pub;
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if (GNUNET_OK !=
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GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT,
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&dc.purpose,
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&exchange_sig->eddsa_signature,
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&exchange_pub->eddsa_pub))
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{
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GNUNET_break_op (0);
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TALER_LOG_WARNING ("Invalid signature on /deposit-confirmation request!\n");
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{
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TALER_LOG_DEBUG ("... amount_without_fee was %s\n",
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TALER_amount2s (amount_without_fee));
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}
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return GNUNET_SYSERR;
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}
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sv.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY);
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sv.purpose.size = htonl (sizeof (struct TALER_ExchangeSigningKeyValidityPS));
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sv.master_public_key = *master_pub;
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sv.start = GNUNET_TIME_absolute_hton (ep_start);
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sv.expire = GNUNET_TIME_absolute_hton (ep_expire);
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sv.end = GNUNET_TIME_absolute_hton (ep_end);
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sv.signkey_pub = *exchange_pub;
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if (GNUNET_OK !=
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GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY,
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&sv.purpose,
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&master_sig->eddsa_signature,
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&master_pub->eddsa_pub))
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{
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GNUNET_break (0);
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TALER_LOG_WARNING ("Invalid signature on exchange signing key!\n");
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return GNUNET_SYSERR;
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}
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if (0 == GNUNET_TIME_absolute_get_remaining (ep_end).rel_value_us)
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{
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GNUNET_break (0);
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TALER_LOG_WARNING ("Exchange signing key is no longer valid!\n");
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return GNUNET_SYSERR;
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}
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return GNUNET_OK;
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}
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/**
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* Submit a deposit-confirmation permission to the auditor and get the
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* auditor's response. Note that while we return the response
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* verbatim to the caller for further processing, we do already verify
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* that the response is well-formed. If the auditor's reply is not
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* well-formed, we return an HTTP status code of zero to @a cb.
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*
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* We also verify that the @a exchange_sig is valid for this deposit-confirmation
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* request, and that the @a master_sig is a valid signature for @a
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* exchange_pub. Also, the @a auditor must be ready to operate (i.e. have
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* finished processing the /version reply). If either check fails, we do
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* NOT initiate the transaction with the auditor and instead return NULL.
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*
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* @param auditor the auditor handle; the auditor must be ready to operate
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* @param h_wire hash of merchant wire details
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* @param h_contract_terms hash of the contact of the merchant with the customer (further details are never disclosed to the auditor)
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* @param timestamp timestamp when the contract was finalized, must not be too far in the future
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* @param refund_deadline date until which the merchant can issue a refund to the customer via the auditor (can be zero if refunds are not allowed); must not be after the @a wire_deadline
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* @param amount_without_fee the amount confirmed to be wired by the exchange to the merchant
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* @param coin_pub coin’s public key
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* @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
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* @param exchange_sig the signature made with purpose #TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT
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* @param exchange_pub the public key of the exchange that matches @a exchange_sig
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* @param master_pub master public key of the exchange
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* @param ep_start when does @a exchange_pub validity start
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* @param ep_expire when does @a exchange_pub usage end
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* @param ep_end when does @a exchange_pub legal validity end
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* @param master_sig master signature affirming validity of @a exchange_pub
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* @param cb the callback to call when a reply for this request is available
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* @param cb_cls closure for the above callback
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* @return a handle for this request; NULL if the inputs are invalid (i.e.
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* signatures fail to verify). In this case, the callback is not called.
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*/
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struct TALER_AUDITOR_DepositConfirmationHandle *
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TALER_AUDITOR_deposit_confirmation (struct TALER_AUDITOR_Handle *auditor,
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const struct GNUNET_HashCode *h_wire,
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const struct
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GNUNET_HashCode *h_contract_terms,
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struct GNUNET_TIME_Absolute timestamp,
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struct GNUNET_TIME_Absolute refund_deadline,
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const struct
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TALER_Amount *amount_without_fee,
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const struct
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TALER_CoinSpendPublicKeyP *coin_pub,
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const struct
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TALER_MerchantPublicKeyP *merchant_pub,
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const struct
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TALER_ExchangePublicKeyP *exchange_pub,
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const struct
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TALER_ExchangeSignatureP *exchange_sig,
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const struct
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TALER_MasterPublicKeyP *master_pub,
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struct GNUNET_TIME_Absolute ep_start,
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struct GNUNET_TIME_Absolute ep_expire,
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struct GNUNET_TIME_Absolute ep_end,
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const struct
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TALER_MasterSignatureP *master_sig,
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TALER_AUDITOR_DepositConfirmationResultCallback
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cb,
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void *cb_cls)
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{
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struct TALER_AUDITOR_DepositConfirmationHandle *dh;
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struct GNUNET_CURL_Context *ctx;
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json_t *deposit_confirmation_obj;
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CURL *eh;
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(void) GNUNET_TIME_round_abs (×tamp);
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(void) GNUNET_TIME_round_abs (&refund_deadline);
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(void) GNUNET_TIME_round_abs (&ep_start);
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(void) GNUNET_TIME_round_abs (&ep_expire);
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(void) GNUNET_TIME_round_abs (&ep_end);
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GNUNET_assert (GNUNET_YES ==
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MAH_handle_is_ready (auditor));
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if (GNUNET_OK !=
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verify_signatures (h_wire,
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h_contract_terms,
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timestamp,
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refund_deadline,
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amount_without_fee,
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coin_pub,
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merchant_pub,
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exchange_pub,
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exchange_sig,
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master_pub,
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ep_start,
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ep_expire,
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ep_end,
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master_sig))
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{
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GNUNET_break_op (0);
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return NULL;
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}
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deposit_confirmation_obj
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= json_pack ("{s:o, s:o," /* h_wire, h_contract_terms */
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" s:o, s:o," /* timestamp, refund_deadline */
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" s:o, s:o," /* amount_without_fees, coin_pub */
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" s:o, s:o," /* merchant_pub, exchange_sig */
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" s:o, s:o," /* master_pub, ep_start */
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" s:o, s:o," /* ep_expire, ep_end */
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" s:o, s:o}", /* master_sig, exchange_pub */
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"h_wire", GNUNET_JSON_from_data_auto (h_wire),
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"h_contract_terms", GNUNET_JSON_from_data_auto (
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h_contract_terms),
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"timestamp", GNUNET_JSON_from_time_abs (timestamp),
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"refund_deadline", GNUNET_JSON_from_time_abs (refund_deadline),
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"amount_without_fee", TALER_JSON_from_amount (
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amount_without_fee),
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"coin_pub", GNUNET_JSON_from_data_auto (coin_pub),
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"merchant_pub", GNUNET_JSON_from_data_auto (merchant_pub),
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"exchange_sig", GNUNET_JSON_from_data_auto (exchange_sig),
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"master_pub", GNUNET_JSON_from_data_auto (master_pub),
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"ep_start", GNUNET_JSON_from_time_abs (ep_start),
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"ep_expire", GNUNET_JSON_from_time_abs (ep_expire),
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"ep_end", GNUNET_JSON_from_time_abs (ep_end),
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"master_sig", GNUNET_JSON_from_data_auto (master_sig),
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"exchange_pub", GNUNET_JSON_from_data_auto (exchange_pub));
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if (NULL == deposit_confirmation_obj)
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{
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GNUNET_break (0);
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return NULL;
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}
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dh = GNUNET_new (struct TALER_AUDITOR_DepositConfirmationHandle);
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dh->auditor = auditor;
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dh->cb = cb;
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dh->cb_cls = cb_cls;
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dh->url = MAH_path_to_url (auditor, "/deposit-confirmation");
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eh = TAL_curl_easy_get (dh->url);
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GNUNET_assert (CURLE_OK ==
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curl_easy_setopt (eh,
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CURLOPT_CUSTOMREQUEST,
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"PUT"));
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if (GNUNET_OK !=
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TALER_curl_easy_post (&dh->ctx,
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eh,
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deposit_confirmation_obj))
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{
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GNUNET_break (0);
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curl_easy_cleanup (eh);
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json_decref (deposit_confirmation_obj);
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GNUNET_free (dh->url);
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GNUNET_free (dh);
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return NULL;
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}
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json_decref (deposit_confirmation_obj);
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GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
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"URL for deposit-confirmation: `%s'\n",
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dh->url);
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ctx = MAH_handle_to_context (auditor);
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dh->job = GNUNET_CURL_job_add2 (ctx,
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eh,
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dh->ctx.headers,
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&handle_deposit_confirmation_finished,
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dh);
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return dh;
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}
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/**
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* Cancel a deposit-confirmation permission request. This function cannot be used
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* on a request handle if a response is already served for it.
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*
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* @param deposit-confirmation the deposit-confirmation permission request handle
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*/
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void
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TALER_AUDITOR_deposit_confirmation_cancel (struct
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TALER_AUDITOR_DepositConfirmationHandle
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*deposit_confirmation)
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{
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if (NULL != deposit_confirmation->job)
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{
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GNUNET_CURL_job_cancel (deposit_confirmation->job);
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deposit_confirmation->job = NULL;
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}
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GNUNET_free (deposit_confirmation->url);
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TALER_curl_easy_post_finished (&deposit_confirmation->ctx);
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GNUNET_free (deposit_confirmation);
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}
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/* end of auditor_api_deposit_confirmation.c */
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