From db669ee495a29384c6d592cb1080db58e832a649 Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Sat, 18 Jan 2020 23:49:37 +0100 Subject: payback -> recoup stranglers --- src/lib/exchange_api_payback.c | 423 ----------------------------------------- 1 file changed, 423 deletions(-) delete mode 100644 src/lib/exchange_api_payback.c (limited to 'src/lib/exchange_api_payback.c') diff --git a/src/lib/exchange_api_payback.c b/src/lib/exchange_api_payback.c deleted file mode 100644 index c20208055..000000000 --- a/src/lib/exchange_api_payback.c +++ /dev/null @@ -1,423 +0,0 @@ -/* - This file is part of TALER - Copyright (C) 2017 GNUnet e.V. and Inria - - TALER is free software; you can redistribute it and/or modify it under the - terms of the GNU 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 General Public License for more details. - - You should have received a copy of the GNU General Public License along with - TALER; see the file COPYING. If not, see - -*/ -/** - * @file lib/exchange_api_payback.c - * @brief Implementation of the /payback request of the exchange's HTTP API - * @author Christian Grothoff - */ -#include "platform.h" -#include -#include /* just for HTTP status codes */ -#include -#include -#include -#include "taler_json_lib.h" -#include "taler_exchange_service.h" -#include "exchange_api_handle.h" -#include "taler_signatures.h" -#include "exchange_api_curl_defaults.h" - - -/** - * @brief A Payback Handle - */ -struct TALER_EXCHANGE_PaybackHandle -{ - - /** - * The connection to exchange this request handle will use - */ - struct TALER_EXCHANGE_Handle *exchange; - - /** - * The url for this request. - */ - char *url; - - /** - * Context for #TEH_curl_easy_post(). Keeps the data that must - * persist for Curl to make the upload. - */ - struct TALER_CURL_PostContext ctx; - - /** - * Denomination key of the coin. - */ - struct TALER_EXCHANGE_DenomPublicKey pk; - - /** - * Handle for the request. - */ - struct GNUNET_CURL_Job *job; - - /** - * Function to call with the result. - */ - TALER_EXCHANGE_PaybackResultCallback cb; - - /** - * Closure for @a cb. - */ - void *cb_cls; - - /** - * Public key of the coin we are trying to get paid back. - */ - struct TALER_CoinSpendPublicKeyP coin_pub; - - /** - * #GNUNET_YES if the coin was refreshed - */ - int was_refreshed; - -}; - - -/** - * Verify that the signature on the "200 OK" response - * from the exchange is valid. If it is, call the - * callback. - * - * @param ph payback handle - * @param json json reply with the signature - * @return #GNUNET_OK if the signature is valid and we called the callback; - * #GNUNET_SYSERR if not (callback must still be called) - */ -static int -verify_payback_signature_ok (const struct TALER_EXCHANGE_PaybackHandle *ph, - const json_t *json) -{ - struct TALER_PaybackConfirmationPS pc; - struct TALER_PaybackRefreshConfirmationPS pr; - struct TALER_ExchangePublicKeyP exchange_pub; - struct TALER_ExchangeSignatureP exchange_sig; - struct TALER_Amount amount; - struct GNUNET_TIME_Absolute timestamp; - const struct TALER_EXCHANGE_Keys *key_state; - struct GNUNET_JSON_Specification spec_withdraw[] = { - GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig), - GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub), - TALER_JSON_spec_amount ("amount", &amount), - GNUNET_JSON_spec_absolute_time ("timestamp", ×tamp), - GNUNET_JSON_spec_fixed_auto ("reserve_pub", &pc.reserve_pub), - GNUNET_JSON_spec_end () - }; - struct GNUNET_JSON_Specification spec_refresh[] = { - GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig), - GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub), - TALER_JSON_spec_amount ("amount", &amount), - GNUNET_JSON_spec_absolute_time ("timestamp", ×tamp), - GNUNET_JSON_spec_fixed_auto ("old_coin_pub", &pr.old_coin_pub), - GNUNET_JSON_spec_end () - }; - - if (GNUNET_OK != - GNUNET_JSON_parse (json, - ph->was_refreshed ? spec_refresh : spec_withdraw, - NULL, NULL)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - key_state = TALER_EXCHANGE_get_keys (ph->exchange); - if (GNUNET_OK != - TALER_EXCHANGE_test_signing_key (key_state, - &exchange_pub)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - if (ph->was_refreshed) - { - pr.purpose.purpose = htonl ( - TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK_REFRESH); - pr.purpose.size = htonl (sizeof (pr)); - pr.timestamp = GNUNET_TIME_absolute_hton (timestamp); - TALER_amount_hton (&pr.payback_amount, - &amount); - pr.coin_pub = ph->coin_pub; - if (GNUNET_OK != - GNUNET_CRYPTO_eddsa_verify ( - TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK_REFRESH, - &pr.purpose, - &exchange_sig.eddsa_signature, - &exchange_pub.eddsa_pub)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - } - else - { - pc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK); - pc.purpose.size = htonl (sizeof (pc)); - pc.timestamp = GNUNET_TIME_absolute_hton (timestamp); - TALER_amount_hton (&pc.payback_amount, - &amount); - pc.coin_pub = ph->coin_pub; - if (GNUNET_OK != - GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_PAYBACK, - &pc.purpose, - &exchange_sig.eddsa_signature, - &exchange_pub.eddsa_pub)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - } - ph->cb (ph->cb_cls, - MHD_HTTP_OK, - TALER_EC_NONE, - &amount, - timestamp, - ph->was_refreshed ? NULL : &pc.reserve_pub, - ph->was_refreshed ? &pr.old_coin_pub : NULL, - json); - return GNUNET_OK; -} - - -/** - * Function called when we're done processing the - * HTTP /payback request. - * - * @param cls the `struct TALER_EXCHANGE_PaybackHandle` - * @param response_code HTTP response code, 0 on error - * @param response parsed JSON result, NULL on error - */ -static void -handle_payback_finished (void *cls, - long response_code, - const void *response) -{ - struct TALER_EXCHANGE_PaybackHandle *ph = cls; - const json_t *j = response; - - ph->job = NULL; - switch (response_code) - { - case 0: - break; - case MHD_HTTP_OK: - if (GNUNET_OK != - verify_payback_signature_ok (ph, - j)) - { - GNUNET_break_op (0); - response_code = 0; - break; - } - TALER_EXCHANGE_payback_cancel (ph); - return; - case MHD_HTTP_BAD_REQUEST: - /* This should never happen, either us or the exchange is buggy - (or API version conflict); just pass JSON reply to the application */ - break; - case MHD_HTTP_CONFLICT: - { - /* Insufficient funds, proof attached */ - json_t *history; - struct TALER_Amount total; - const struct TALER_EXCHANGE_DenomPublicKey *dki; - - dki = &ph->pk; - history = json_object_get (j, - "history"); - if (GNUNET_OK != - TALER_EXCHANGE_verify_coin_history (dki, - dki->fee_deposit.currency, - &ph->coin_pub, - history, - &total)) - { - GNUNET_break_op (0); - response_code = 0; - } - ph->cb (ph->cb_cls, - response_code, - TALER_JSON_get_error_code (j), - &total, - GNUNET_TIME_UNIT_FOREVER_ABS, - NULL, - NULL, - j); - TALER_EXCHANGE_payback_cancel (ph); - return; - } - case MHD_HTTP_FORBIDDEN: - /* Nothing really to verify, exchange says one of the signatures is - invalid; as we checked them, this should never happen, we - should pass the JSON reply to the application */ - break; - case MHD_HTTP_NOT_FOUND: - /* Nothing really to verify, this should never - happen, we should pass the JSON reply to the application */ - break; - case MHD_HTTP_GONE: - /* Kind of normal: the money was already sent to the merchant - (it was too late for the refund). */ - break; - case MHD_HTTP_INTERNAL_SERVER_ERROR: - /* Server had an internal issue; we should retry, but this API - leaves this to the application */ - break; - default: - /* unexpected response code */ - GNUNET_log (GNUNET_ERROR_TYPE_ERROR, - "Unexpected response code %u\n", - (unsigned int) response_code); - GNUNET_break (0); - response_code = 0; - break; - } - ph->cb (ph->cb_cls, - response_code, - TALER_JSON_get_error_code (j), - NULL, - GNUNET_TIME_UNIT_FOREVER_ABS, - NULL, - NULL, - j); - TALER_EXCHANGE_payback_cancel (ph); -} - - -/** - * Ask the exchange to pay back a coin due to the exchange triggering - * the emergency payback protocol for a given denomination. The value - * of the coin will be refunded to the original customer (without fees). - * - * @param exchange the exchange handle; the exchange must be ready to operate - * @param pk kind of coin to pay back - * @param denom_sig signature over the coin by the exchange using @a pk - * @param ps secret internals of the original planchet - * @param was_refreshed #GNUNET_YES if the coin in @a ps was refreshed - * @param payback_cb the callback to call when the final result for this request is available - * @param payback_cb_cls closure for @a payback_cb - * @return NULL - * if the inputs are invalid (i.e. denomination key not with this exchange). - * In this case, the callback is not called. - */ -struct TALER_EXCHANGE_PaybackHandle * -TALER_EXCHANGE_payback (struct TALER_EXCHANGE_Handle *exchange, - const struct TALER_EXCHANGE_DenomPublicKey *pk, - const struct TALER_DenominationSignature *denom_sig, - const struct TALER_PlanchetSecretsP *ps, - int was_refreshed, - TALER_EXCHANGE_PaybackResultCallback payback_cb, - void *payback_cb_cls) -{ - struct TALER_EXCHANGE_PaybackHandle *ph; - struct GNUNET_CURL_Context *ctx; - struct TALER_PaybackRequestPS pr; - struct TALER_CoinSpendSignatureP coin_sig; - struct GNUNET_HashCode h_denom_pub; - json_t *payback_obj; - CURL *eh; - - GNUNET_assert (GNUNET_YES == - TEAH_handle_is_ready (exchange)); - pr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_PAYBACK); - pr.purpose.size = htonl (sizeof (struct TALER_PaybackRequestPS)); - GNUNET_CRYPTO_eddsa_key_get_public (&ps->coin_priv.eddsa_priv, - &pr.coin_pub.eddsa_pub); - GNUNET_CRYPTO_rsa_public_key_hash (pk->key.rsa_public_key, - &h_denom_pub); - pr.h_denom_pub = pk->h_key; - pr.coin_blind = ps->blinding_key; - GNUNET_assert (GNUNET_OK == - GNUNET_CRYPTO_eddsa_sign (&ps->coin_priv.eddsa_priv, - &pr.purpose, - &coin_sig.eddsa_signature)); - - payback_obj = json_pack ("{s:o, s:o," /* denom pub/sig */ - " s:o, s:o," /* coin pub/sig */ - " s:o, s:o}", /* coin_bks */ - "denom_pub_hash", GNUNET_JSON_from_data_auto ( - &h_denom_pub), - "denom_sig", GNUNET_JSON_from_rsa_signature ( - denom_sig->rsa_signature), - "coin_pub", GNUNET_JSON_from_data_auto ( - &pr.coin_pub), - "coin_sig", GNUNET_JSON_from_data_auto (&coin_sig), - "coin_blind_key_secret", GNUNET_JSON_from_data_auto ( - &ps->blinding_key), - "refreshed", json_boolean (was_refreshed) - ); - if (NULL == payback_obj) - { - GNUNET_break (0); - return NULL; - } - - ph = GNUNET_new (struct TALER_EXCHANGE_PaybackHandle); - ph->coin_pub = pr.coin_pub; - ph->exchange = exchange; - ph->pk = *pk; - ph->pk.key.rsa_public_key = NULL; /* zero out, as lifetime cannot be warranted */ - ph->cb = payback_cb; - ph->cb_cls = payback_cb_cls; - ph->url = TEAH_path_to_url (exchange, "/payback"); - ph->was_refreshed = was_refreshed; - eh = TEL_curl_easy_get (ph->url); - if (GNUNET_OK != - TALER_curl_easy_post (&ph->ctx, - eh, - payback_obj)) - { - GNUNET_break (0); - curl_easy_cleanup (eh); - json_decref (payback_obj); - GNUNET_free (ph->url); - GNUNET_free (ph); - return NULL; - } - json_decref (payback_obj); - GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, - "URL for payback: `%s'\n", - ph->url); - ctx = TEAH_handle_to_context (exchange); - ph->job = GNUNET_CURL_job_add2 (ctx, - eh, - ph->ctx.headers, - &handle_payback_finished, - ph); - return ph; -} - - -/** - * Cancel a payback request. This function cannot be used on a - * request handle if the callback was already invoked. - * - * @param ph the payback handle - */ -void -TALER_EXCHANGE_payback_cancel (struct TALER_EXCHANGE_PaybackHandle *ph) -{ - if (NULL != ph->job) - { - GNUNET_CURL_job_cancel (ph->job); - ph->job = NULL; - } - GNUNET_free (ph->url); - TALER_curl_easy_post_finished (&ph->ctx); - GNUNET_free (ph); -} - - -/* end of exchange_api_payback.c */ -- cgit v1.2.3