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authorChristian Grothoff <christian@grothoff.org>2019-01-11 21:27:34 +0100
committerChristian Grothoff <christian@grothoff.org>2019-01-11 21:43:15 +0100
commit54fc83ee6b910d482948c6ec8185df7aab1b0cb1 (patch)
tree10c04cad1392659a9ccef469271f866e393ebb48 /src/lib/auditor_api_deposit_confirmation.c
parent57ab9f9fdba607fcc3817adf58f37c5390f8d220 (diff)
downloadexchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.tar.gz
exchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.tar.bz2
exchange-54fc83ee6b910d482948c6ec8185df7aab1b0cb1.zip
fix cyclic dependency by combining exchange-lib and auditor-lib directories
Diffstat (limited to 'src/lib/auditor_api_deposit_confirmation.c')
-rw-r--r--src/lib/auditor_api_deposit_confirmation.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/src/lib/auditor_api_deposit_confirmation.c b/src/lib/auditor_api_deposit_confirmation.c
new file mode 100644
index 00000000..99c855fb
--- /dev/null
+++ b/src/lib/auditor_api_deposit_confirmation.c
@@ -0,0 +1,384 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014-2018 GNUnet e.V.
+
+ 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
+ <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file auditor-lib/auditor_api_deposit_confirmation.c
+ * @brief Implementation of the /deposit request of the auditor's HTTP API
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_json_lib.h"
+#include "taler_auditor_service.h"
+#include "auditor_api_handle.h"
+#include "taler_signatures.h"
+#include "auditor_api_curl_defaults.h"
+
+
+/**
+ * @brief A DepositConfirmation Handle
+ */
+struct TALER_AUDITOR_DepositConfirmationHandle
+{
+
+ /**
+ * The connection to auditor this request handle will use
+ */
+ struct TALER_AUDITOR_Handle *auditor;
+
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * JSON encoding of the request to POST.
+ */
+ char *json_enc;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_AUDITOR_DepositConfirmationResultCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /deposit-confirmation request.
+ *
+ * @param cls the `struct TALER_AUDITOR_DepositConfirmationHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param djson parsed JSON result, NULL on error
+ */
+static void
+handle_deposit_confirmation_finished (void *cls,
+ long response_code,
+ const void *djson)
+{
+ const json_t *json = djson;
+ struct TALER_AUDITOR_DepositConfirmationHandle *dh = cls;
+
+ dh->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ break;
+ case MHD_HTTP_OK:
+ break;
+ case MHD_HTTP_BAD_REQUEST:
+ /* This should never happen, either us or the auditor is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ break;
+ case MHD_HTTP_UNAUTHORIZED:
+ /* Nothing really to verify, auditor 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_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;
+ }
+ dh->cb (dh->cb_cls,
+ response_code,
+ TALER_JSON_get_error_code (json),
+ json);
+ TALER_AUDITOR_deposit_confirmation_cancel (dh);
+}
+
+
+/**
+ * Verify signature information about the deposit-confirmation.
+ *
+ * @param h_wire hash of merchant wire details
+ * @param h_contract_terms hash of the contact of the merchant with the customer (further details are never disclosed to the auditor)
+ * @param timestamp timestamp when the contract was finalized, must not be too far in the future
+ * @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
+ * @param amount_without_fee the amount confirmed to be wired by the exchange to the merchant
+ * @param coin_pub coin’s public key
+ * @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
+ * @param exchange_sig the signature made with purpose #TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT
+ * @param exchange_pub the public key of the exchange that matches @a exchange_sig
+ * @param master_pub master public key of the exchange
+ * @param ep_start when does @a exchange_pub validity start
+ * @param ep_expire when does @a exchange_pub usage end
+ * @param ep_end when does @a exchange_pub legal validity end
+ * @param master_sig master signature affirming validity of @a exchange_pub
+ * @return #GNUNET_OK if signatures are OK, #GNUNET_SYSERR if not
+ */
+static int
+verify_signatures (const struct GNUNET_HashCode *h_wire,
+ const struct GNUNET_HashCode *h_contract_terms,
+ struct GNUNET_TIME_Absolute timestamp,
+ struct GNUNET_TIME_Absolute refund_deadline,
+ const struct TALER_Amount *amount_without_fee,
+ const struct TALER_CoinSpendPublicKeyP *coin_pub,
+ const struct TALER_MerchantPublicKeyP *merchant_pub,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
+ const struct TALER_ExchangeSignatureP *exchange_sig,
+ const struct TALER_MasterPublicKeyP *master_pub,
+ struct GNUNET_TIME_Absolute ep_start,
+ struct GNUNET_TIME_Absolute ep_expire,
+ struct GNUNET_TIME_Absolute ep_end,
+ const struct TALER_MasterSignatureP *master_sig)
+{
+ struct TALER_DepositConfirmationPS dc;
+ struct TALER_ExchangeSigningKeyValidityPS sv;
+
+ dc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT);
+ dc.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS));
+ dc.h_contract_terms = *h_contract_terms;
+ dc.h_wire = *h_wire;
+ dc.timestamp = GNUNET_TIME_absolute_hton (timestamp);
+ dc.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline);
+ TALER_amount_hton (&dc.amount_without_fee,
+ amount_without_fee);
+ dc.coin_pub = *coin_pub;
+ dc.merchant = *merchant_pub;
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT,
+ &dc.purpose,
+ &exchange_sig->eddsa_signature,
+ &exchange_pub->eddsa_pub))
+ {
+ GNUNET_break_op (0);
+ TALER_LOG_WARNING ("Invalid signature on /deposit-confirmation request!\n");
+ {
+ TALER_LOG_DEBUG ("... amount_without_fee was %s\n",
+ TALER_amount2s (amount_without_fee));
+ }
+
+ return GNUNET_SYSERR;
+ }
+ sv.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY);
+ sv.purpose.size = htonl (sizeof (struct TALER_ExchangeSigningKeyValidityPS));
+ sv.master_public_key = *master_pub;
+ sv.start = GNUNET_TIME_absolute_hton (ep_start);
+ sv.expire = GNUNET_TIME_absolute_hton (ep_expire);
+ sv.end = GNUNET_TIME_absolute_hton (ep_end);
+ sv.signkey_pub = *exchange_pub;
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY,
+ &sv.purpose,
+ &master_sig->eddsa_signature,
+ &master_pub->eddsa_pub))
+ {
+ GNUNET_break (0);
+ TALER_LOG_WARNING ("Invalid signature on exchange signing key!\n");
+ return GNUNET_SYSERR;
+ }
+ if (0 == GNUNET_TIME_absolute_get_remaining (ep_end).rel_value_us)
+ {
+ GNUNET_break (0);
+ TALER_LOG_WARNING ("Exchange signing key is no longer valid!\n");
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Submit a deposit-confirmation permission to the auditor and get the
+ * auditor's response. Note that while we return the response
+ * verbatim to the caller for further processing, we do already verify
+ * that the response is well-formed. If the auditor's reply is not
+ * well-formed, we return an HTTP status code of zero to @a cb.
+ *
+ * We also verify that the @a exchange_sig is valid for this deposit-confirmation
+ * request, and that the @a master_sig is a valid signature for @a
+ * exchange_pub. Also, the @a auditor must be ready to operate (i.e. have
+ * finished processing the /version reply). If either check fails, we do
+ * NOT initiate the transaction with the auditor and instead return NULL.
+ *
+ * @param auditor the auditor handle; the auditor must be ready to operate
+ * @param h_wire hash of merchant wire details
+ * @param h_contract_terms hash of the contact of the merchant with the customer (further details are never disclosed to the auditor)
+ * @param timestamp timestamp when the contract was finalized, must not be too far in the future
+ * @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
+ * @param amount_without_fee the amount confirmed to be wired by the exchange to the merchant
+ * @param coin_pub coin’s public key
+ * @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
+ * @param exchange_sig the signature made with purpose #TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT
+ * @param exchange_pub the public key of the exchange that matches @a exchange_sig
+ * @param master_pub master public key of the exchange
+ * @param ep_start when does @a exchange_pub validity start
+ * @param ep_expire when does @a exchange_pub usage end
+ * @param ep_end when does @a exchange_pub legal validity end
+ * @param master_sig master signature affirming validity of @a exchange_pub
+ * @param cb the callback to call when a reply for this request is available
+ * @param cb_cls closure for the above callback
+ * @return a handle for this request; NULL if the inputs are invalid (i.e.
+ * signatures fail to verify). In this case, the callback is not called.
+ */
+struct TALER_AUDITOR_DepositConfirmationHandle *
+TALER_AUDITOR_deposit_confirmation (struct TALER_AUDITOR_Handle *auditor,
+ const struct GNUNET_HashCode *h_wire,
+ const struct GNUNET_HashCode *h_contract_terms,
+ struct GNUNET_TIME_Absolute timestamp,
+ struct GNUNET_TIME_Absolute refund_deadline,
+ const struct TALER_Amount *amount_without_fee,
+ const struct TALER_CoinSpendPublicKeyP *coin_pub,
+ const struct TALER_MerchantPublicKeyP *merchant_pub,
+ const struct TALER_ExchangePublicKeyP *exchange_pub,
+ const struct TALER_ExchangeSignatureP *exchange_sig,
+ const struct TALER_MasterPublicKeyP *master_pub,
+ struct GNUNET_TIME_Absolute ep_start,
+ struct GNUNET_TIME_Absolute ep_expire,
+ struct GNUNET_TIME_Absolute ep_end,
+ const struct TALER_MasterSignatureP *master_sig,
+ TALER_AUDITOR_DepositConfirmationResultCallback cb,
+ void *cb_cls)
+{
+ struct TALER_AUDITOR_DepositConfirmationHandle *dh;
+ struct GNUNET_CURL_Context *ctx;
+ json_t *deposit_confirmation_obj;
+ CURL *eh;
+
+ (void) GNUNET_TIME_round_abs (&timestamp);
+ (void) GNUNET_TIME_round_abs (&refund_deadline);
+ (void) GNUNET_TIME_round_abs (&ep_start);
+ (void) GNUNET_TIME_round_abs (&ep_expire);
+ (void) GNUNET_TIME_round_abs (&ep_end);
+ GNUNET_assert (GNUNET_YES ==
+ MAH_handle_is_ready (auditor));
+ if (GNUNET_OK !=
+ verify_signatures (h_wire,
+ h_contract_terms,
+ timestamp,
+ refund_deadline,
+ amount_without_fee,
+ coin_pub,
+ merchant_pub,
+ exchange_pub,
+ exchange_sig,
+ master_pub,
+ ep_start,
+ ep_expire,
+ ep_end,
+ master_sig))
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+
+ deposit_confirmation_obj
+ = json_pack ("{s:o, s:o," /* H_wire, h_contract_terms */
+ " s:o, s:o," /* timestamp, refund_deadline */
+ " s:o, s:o," /* amount_without_fees, coin_pub */
+ " s:o, s:o," /* merchant_pub, exchange_sig */
+ " s:o, s:o," /* master_pub, ep_start */
+ " s:o, s:o," /* ep_expire, ep_end */
+ " s:o}", /* master_sig */
+ "H_wire", GNUNET_JSON_from_data_auto (&h_wire),
+ "h_contract_terms", GNUNET_JSON_from_data_auto (h_contract_terms),
+ "timestamp", GNUNET_JSON_from_time_abs (timestamp),
+ "refund_deadline", GNUNET_JSON_from_time_abs (refund_deadline),
+ "amount_without_fee", TALER_JSON_from_amount (amount_without_fee),
+ "coin_pub", GNUNET_JSON_from_data_auto (coin_pub),
+ "merchant_pub", GNUNET_JSON_from_data_auto (merchant_pub),
+ "exchange_sig", GNUNET_JSON_from_data_auto (exchange_sig),
+ "master_pub", GNUNET_JSON_from_data_auto (master_pub),
+ "ep_start", GNUNET_JSON_from_time_abs (ep_start),
+ "ep_expire", GNUNET_JSON_from_time_abs (ep_expire),
+ "ep_end", GNUNET_JSON_from_time_abs (ep_end),
+ "master_sig", GNUNET_JSON_from_data_auto (master_sig));
+ if (NULL == deposit_confirmation_obj)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+
+ dh = GNUNET_new (struct TALER_AUDITOR_DepositConfirmationHandle);
+ dh->auditor = auditor;
+ dh->cb = cb;
+ dh->cb_cls = cb_cls;
+ dh->url = MAH_path_to_url (auditor, "/deposit-confirmation");
+
+ eh = TAL_curl_easy_get (dh->url);
+ GNUNET_assert (NULL != (dh->json_enc =
+ json_dumps (deposit_confirmation_obj,
+ JSON_COMPACT)));
+ json_decref (deposit_confirmation_obj);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "URL for deposit-confirmation: `%s'\n",
+ dh->url);
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_POSTFIELDS,
+ dh->json_enc));
+ GNUNET_assert (CURLE_OK ==
+ curl_easy_setopt (eh,
+ CURLOPT_POSTFIELDSIZE,
+ strlen (dh->json_enc)));
+ ctx = MAH_handle_to_context (auditor);
+ dh->job = GNUNET_CURL_job_add (ctx,
+ eh,
+ GNUNET_YES,
+ &handle_deposit_confirmation_finished,
+ dh);
+ return dh;
+}
+
+
+/**
+ * Cancel a deposit-confirmation permission request. This function cannot be used
+ * on a request handle if a response is already served for it.
+ *
+ * @param deposit-confirmation the deposit-confirmation permission request handle
+ */
+void
+TALER_AUDITOR_deposit_confirmation_cancel (struct TALER_AUDITOR_DepositConfirmationHandle *deposit_confirmation)
+{
+ if (NULL != deposit_confirmation->job)
+ {
+ GNUNET_CURL_job_cancel (deposit_confirmation->job);
+ deposit_confirmation->job = NULL;
+ }
+ GNUNET_free (deposit_confirmation->url);
+ GNUNET_free (deposit_confirmation->json_enc);
+ GNUNET_free (deposit_confirmation);
+}
+
+
+/* end of auditor_api_deposit_confirmation.c */