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authorChristian Grothoff <christian@grothoff.org>2020-01-18 23:49:37 +0100
committerChristian Grothoff <christian@grothoff.org>2020-01-18 23:49:37 +0100
commitdb669ee495a29384c6d592cb1080db58e832a649 (patch)
tree0bbc1a119098467eb731cd53c59d9df4dba079d7 /src/exchange/taler-exchange-httpd_recoup.c
parent6e17a847e8267ae10beaa8fc849bf10517088ab2 (diff)
downloadexchange-db669ee495a29384c6d592cb1080db58e832a649.tar.gz
exchange-db669ee495a29384c6d592cb1080db58e832a649.tar.bz2
exchange-db669ee495a29384c6d592cb1080db58e832a649.zip
payback -> recoup stranglers
Diffstat (limited to 'src/exchange/taler-exchange-httpd_recoup.c')
-rw-r--r--src/exchange/taler-exchange-httpd_recoup.c636
1 files changed, 636 insertions, 0 deletions
diff --git a/src/exchange/taler-exchange-httpd_recoup.c b/src/exchange/taler-exchange-httpd_recoup.c
new file mode 100644
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--- /dev/null
+++ b/src/exchange/taler-exchange-httpd_recoup.c
@@ -0,0 +1,636 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2017 Inria and GNUnet e.V.
+
+ 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_recoup.c
+ * @brief Handle /recoup requests; parses the POST and JSON and
+ * verifies the coin signature before handing things off
+ * to the database.
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <jansson.h>
+#include <microhttpd.h>
+#include <pthread.h>
+#include "taler_json_lib.h"
+#include "taler_mhd_lib.h"
+#include "taler-exchange-httpd_recoup.h"
+#include "taler-exchange-httpd_responses.h"
+#include "taler-exchange-httpd_keystate.h"
+#include "taler-exchange-httpd_validation.h"
+
+
+/**
+ * A wallet asked for /recoup, return the successful response.
+ *
+ * @param connection connection to the client
+ * @param coin_pub coin for which we are processing the recoup request
+ * @param old_coin_pub public key of the old coin that will receive the recoup
+ * @param amount the amount we will wire back
+ * @param timestamp when did the exchange receive the /recoup request
+ * @return MHD result code
+ */
+static int
+reply_recoup_refresh_success (struct MHD_Connection *connection,
+ const struct TALER_CoinSpendPublicKeyP *coin_pub,
+ const struct
+ TALER_CoinSpendPublicKeyP *old_coin_pub,
+ const struct TALER_Amount *amount,
+ struct GNUNET_TIME_Absolute timestamp)
+{
+ struct TALER_RecoupRefreshConfirmationPS pc;
+ struct TALER_ExchangePublicKeyP pub;
+ struct TALER_ExchangeSignatureP sig;
+
+ pc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_RECOUP_REFRESH);
+ pc.purpose.size = htonl (sizeof (struct TALER_RecoupRefreshConfirmationPS));
+ pc.timestamp = GNUNET_TIME_absolute_hton (timestamp);
+ TALER_amount_hton (&pc.recoup_amount,
+ amount);
+ pc.coin_pub = *coin_pub;
+ pc.old_coin_pub = *old_coin_pub;
+ if (GNUNET_OK !=
+ TEH_KS_sign (&pc.purpose,
+ &pub,
+ &sig))
+ {
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_EXCHANGE_BAD_CONFIGURATION,
+ "no keys");
+ }
+ return TALER_MHD_reply_json_pack (connection,
+ MHD_HTTP_OK,
+ "{s:o, s:o, s:o, s:o, s:o}",
+ "old_coin_pub",
+ GNUNET_JSON_from_data_auto (
+ old_coin_pub),
+ "timestamp", GNUNET_JSON_from_time_abs (
+ timestamp),
+ "amount", TALER_JSON_from_amount (
+ amount),
+ "exchange_sig",
+ GNUNET_JSON_from_data_auto (&sig),
+ "exchange_pub",
+ GNUNET_JSON_from_data_auto (&pub));
+}
+
+
+/**
+ * A wallet asked for /recoup, return the successful response.
+ *
+ * @param connection connection to the client
+ * @param coin_pub coin for which we are processing the recoup request
+ * @param reserve_pub public key of the reserve that will receive the recoup
+ * @param amount the amount we will wire back
+ * @param timestamp when did the exchange receive the /recoup request
+ * @return MHD result code
+ */
+static int
+reply_recoup_success (struct MHD_Connection *connection,
+ const struct TALER_CoinSpendPublicKeyP *coin_pub,
+ const struct TALER_ReservePublicKeyP *reserve_pub,
+ const struct TALER_Amount *amount,
+ struct GNUNET_TIME_Absolute timestamp)
+{
+ struct TALER_RecoupConfirmationPS pc;
+ struct TALER_ExchangePublicKeyP pub;
+ struct TALER_ExchangeSignatureP sig;
+
+ pc.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_RECOUP);
+ pc.purpose.size = htonl (sizeof (struct TALER_RecoupConfirmationPS));
+ pc.timestamp = GNUNET_TIME_absolute_hton (timestamp);
+ TALER_amount_hton (&pc.recoup_amount,
+ amount);
+ pc.coin_pub = *coin_pub;
+ pc.reserve_pub = *reserve_pub;
+ if (GNUNET_OK !=
+ TEH_KS_sign (&pc.purpose,
+ &pub,
+ &sig))
+ {
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_EXCHANGE_BAD_CONFIGURATION,
+ "no keys");
+ }
+ return TALER_MHD_reply_json_pack (connection,
+ MHD_HTTP_OK,
+ "{s:o, s:o, s:o, s:o, s:o}",
+ "reserve_pub",
+ GNUNET_JSON_from_data_auto (reserve_pub),
+ "timestamp", GNUNET_JSON_from_time_abs (
+ timestamp),
+ "amount", TALER_JSON_from_amount (
+ amount),
+ "exchange_sig",
+ GNUNET_JSON_from_data_auto (&sig),
+ "exchange_pub",
+ GNUNET_JSON_from_data_auto (&pub));
+}
+
+
+/**
+ * Closure for #recoup_transaction.
+ */
+struct RecoupContext
+{
+ /**
+ * Hash of the blinded coin.
+ */
+ struct GNUNET_HashCode h_blind;
+
+ /**
+ * Full value of the coin.
+ */
+ struct TALER_Amount value;
+
+ /**
+ * Details about the coin.
+ */
+ const struct TALER_CoinPublicInfo *coin;
+
+ /**
+ * Key used to blind the coin.
+ */
+ const struct TALER_DenominationBlindingKeyP *coin_bks;
+
+ /**
+ * Signature of the coin requesting recoup.
+ */
+ const struct TALER_CoinSpendSignatureP *coin_sig;
+
+ union
+ {
+ /**
+ * Set by #recoup_transaction() to the reserve that will
+ * receive the recoup, if #refreshed is #GNUNET_NO.
+ */
+ struct TALER_ReservePublicKeyP reserve_pub;
+
+ /**
+ * Set by #recoup_transaction() to the old coin that will
+ * receive the recoup, if #refreshed is #GNUNET_YES.
+ */
+ struct TALER_CoinSpendPublicKeyP old_coin_pub;
+ } target;
+
+ /**
+ * Set by #recoup_transaction() to the amount that will be paid back
+ */
+ struct TALER_Amount amount;
+
+ /**
+ * Set by #recoup_transaction to the timestamp when the recoup
+ * was accepted.
+ */
+ struct GNUNET_TIME_Absolute now;
+
+ /**
+ * #GNUNET_YES if the client claims the coin originated from a refresh.
+ */
+ int refreshed;
+
+};
+
+
+/**
+ * Execute a "/recoup". The validity of the coin and signature have
+ * already been checked. The database must now check that the coin is
+ * not (double) spent, and execute the transaction.
+ *
+ * IF it returns a non-error code, the transaction logic MUST
+ * NOT queue a MHD response. IF it returns an hard error, the
+ * transaction logic MUST queue a MHD response and set @a mhd_ret. IF
+ * it returns the soft error code, the function MAY be called again to
+ * retry and MUST not queue a MHD response.
+ *
+ * @param cls the `struct RecoupContext *`
+ * @param connection MHD request which triggered the transaction
+ * @param session database session to use
+ * @param[out] mhd_ret set to MHD response status for @a connection,
+ * if transaction failed (!)
+ * @return transaction status code
+ */
+static enum GNUNET_DB_QueryStatus
+recoup_transaction (void *cls,
+ struct MHD_Connection *connection,
+ struct TALER_EXCHANGEDB_Session *session,
+ int *mhd_ret)
+{
+ struct RecoupContext *pc = cls;
+ struct TALER_EXCHANGEDB_TransactionList *tl;
+ struct TALER_Amount spent;
+ enum GNUNET_DB_QueryStatus qs;
+
+ /* Check whether a recoup is allowed, and if so, to which
+ reserve / account the money should go */
+ if (pc->refreshed)
+ {
+ qs = TEH_plugin->get_old_coin_by_h_blind (TEH_plugin->cls,
+ session,
+ &pc->h_blind,
+ &pc->target.old_coin_pub);
+ if (0 > qs)
+ {
+ if (GNUNET_DB_STATUS_HARD_ERROR == qs)
+ {
+ GNUNET_break (0);
+ *mhd_ret = TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_RECOUP_DB_FETCH_FAILED,
+ "failed to fetch old coin of blind coin");
+ }
+ return qs;
+ }
+ }
+ else
+ {
+ qs = TEH_plugin->get_reserve_by_h_blind (TEH_plugin->cls,
+ session,
+ &pc->h_blind,
+ &pc->target.reserve_pub);
+ if (0 > qs)
+ {
+ if (GNUNET_DB_STATUS_HARD_ERROR == qs)
+ {
+ GNUNET_break (0);
+ *mhd_ret = TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_RECOUP_DB_FETCH_FAILED,
+ "failed to fetch reserve of blinded coin");
+ }
+ return qs;
+ }
+ }
+ if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Recoup requested for unknown envelope %s\n",
+ GNUNET_h2s (&pc->h_blind));
+ *mhd_ret = TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_NOT_FOUND,
+ TALER_EC_RECOUP_WITHDRAW_NOT_FOUND,
+ "blind coin unknown");
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ }
+
+ /* Calculate remaining balance, including recoups already applied. */
+ qs = TEH_plugin->get_coin_transactions (TEH_plugin->cls,
+ session,
+ &pc->coin->coin_pub,
+ GNUNET_YES,
+ &tl);
+ if (0 > qs)
+ {
+ if (GNUNET_DB_STATUS_HARD_ERROR == qs)
+ {
+ GNUNET_break (0);
+ *mhd_ret = TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_RECOUP_DB_FETCH_FAILED,
+ "failed to fetch old coin transaction history");
+ }
+ return qs;
+ }
+
+ GNUNET_assert (GNUNET_OK ==
+ TALER_amount_get_zero (pc->value.currency,
+ &spent));
+ if (GNUNET_OK !=
+ TALER_EXCHANGEDB_calculate_transaction_list_totals (tl,
+ &spent,
+ &spent))
+ {
+ GNUNET_break (0);
+ TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
+ tl);
+ *mhd_ret = TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_RECOUP_HISTORY_DB_ERROR,
+ "failed to calculate old coin transaction history");
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ }
+ if (GNUNET_SYSERR ==
+ TALER_amount_subtract (&pc->amount,
+ &pc->value,
+ &spent))
+ {
+ GNUNET_break (0);
+ TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
+ tl);
+ *mhd_ret = TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_RECOUP_COIN_BALANCE_NEGATIVE,
+ "calculated negative old coin balance");
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ }
+ if ( (0 == pc->amount.fraction) &&
+ (0 == pc->amount.value) )
+ {
+ TEH_plugin->rollback (TEH_plugin->cls,
+ session);
+ *mhd_ret = TEH_RESPONSE_reply_coin_insufficient_funds (connection,
+ TALER_EC_RECOUP_COIN_BALANCE_ZERO,
+ &pc->coin->coin_pub,
+ tl);
+ TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
+ tl);
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ }
+ TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
+ tl);
+ pc->now = GNUNET_TIME_absolute_get ();
+ (void) GNUNET_TIME_round_abs (&pc->now);
+
+ /* add coin to list of wire transfers for recoup */
+ if (pc->refreshed)
+ {
+ qs = TEH_plugin->insert_recoup_refresh_request (TEH_plugin->cls,
+ session,
+ pc->coin,
+ pc->coin_sig,
+ pc->coin_bks,
+ &pc->amount,
+ &pc->h_blind,
+ pc->now);
+ }
+ else
+ {
+ qs = TEH_plugin->insert_recoup_request (TEH_plugin->cls,
+ session,
+ &pc->target.reserve_pub,
+ pc->coin,
+ pc->coin_sig,
+ pc->coin_bks,
+ &pc->amount,
+ &pc->h_blind,
+ pc->now);
+ }
+ if (0 > qs)
+ {
+ if (GNUNET_DB_STATUS_HARD_ERROR == qs)
+ {
+ TALER_LOG_WARNING ("Failed to store /recoup information in database\n");
+ *mhd_ret = TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_RECOUP_DB_PUT_FAILED,
+ "failed to persist recoup data");
+ }
+ return qs;
+ }
+ return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
+}
+
+
+/**
+ * We have parsed the JSON information about the recoup request. Do
+ * some basic sanity checks (especially that the signature on the
+ * request and coin is valid) and then execute the recoup operation.
+ * Note that we need the DB to check the fee structure, so this is not
+ * done here.
+ *
+ * @param connection the MHD connection to handle
+ * @param coin information about the coin
+ * @param coin_bks blinding data of the coin (to be checked)
+ * @param coin_sig signature of the coin
+ * @param refreshed #GNUNET_YES if the coin was refreshed
+ * @return MHD result code
+ */
+static int
+verify_and_execute_recoup (struct MHD_Connection *connection,
+ const struct TALER_CoinPublicInfo *coin,
+ const struct
+ TALER_DenominationBlindingKeyP *coin_bks,
+ const struct TALER_CoinSpendSignatureP *coin_sig,
+ int refreshed)
+{
+ struct RecoupContext pc;
+ const struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
+ struct TALER_RecoupRequestPS pr;
+ struct GNUNET_HashCode c_hash;
+ char *coin_ev;
+ size_t coin_ev_size;
+ enum TALER_ErrorCode ec;
+ unsigned int hc;
+
+ /* check denomination exists and is in recoup mode */
+ {
+ struct TEH_KS_StateHandle *key_state;
+
+ key_state = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
+ if (NULL == key_state)
+ {
+ TALER_LOG_ERROR ("Lacking keys to operate\n");
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_EXCHANGE_BAD_CONFIGURATION,
+ "no keys");
+ }
+ dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
+ &coin->denom_pub_hash,
+ TEH_KS_DKU_RECOUP,
+ &ec,
+ &hc);
+ if (NULL == dki)
+ {
+ TEH_KS_release (key_state);
+ TALER_LOG_WARNING (
+ "Denomination key in /recoup request not in recoup mode\n");
+ return TALER_MHD_reply_with_error (connection,
+ hc,
+ ec,
+ "denomination not allowing recoup");
+ }
+ TALER_amount_ntoh (&pc.value,
+ &dki->issue.properties.value);
+
+ /* check denomination signature */
+ if (GNUNET_YES !=
+ TALER_test_coin_valid (coin,
+ &dki->denom_pub))
+ {
+ TALER_LOG_WARNING ("Invalid coin passed for /recoup\n");
+ TEH_KS_release (key_state);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_FORBIDDEN,
+ TALER_EC_RECOUP_DENOMINATION_SIGNATURE_INVALID,
+ "denom_sig");
+ }
+
+ /* check recoup request signature */
+ pr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_RECOUP);
+ pr.purpose.size = htonl (sizeof (struct TALER_RecoupRequestPS));
+ pr.coin_pub = coin->coin_pub;
+ pr.h_denom_pub = dki->issue.properties.denom_hash;
+ pr.coin_blind = *coin_bks;
+
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_RECOUP,
+ &pr.purpose,
+ &coin_sig->eddsa_signature,
+ &coin->coin_pub.eddsa_pub))
+ {
+ TALER_LOG_WARNING ("Invalid signature on /recoup request\n");
+ TEH_KS_release (key_state);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_FORBIDDEN,
+ TALER_EC_RECOUP_SIGNATURE_INVALID,
+ "coin_sig");
+ }
+ GNUNET_CRYPTO_hash (&coin->coin_pub.eddsa_pub,
+ sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
+ &c_hash);
+ if (GNUNET_YES !=
+ GNUNET_CRYPTO_rsa_blind (&c_hash,
+ &coin_bks->bks,
+ dki->denom_pub.rsa_public_key,
+ &coin_ev,
+ &coin_ev_size))
+ {
+ GNUNET_break (0);
+ TEH_KS_release (key_state);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_RECOUP_BLINDING_FAILED,
+ "coin_bks");
+ }
+ TEH_KS_release (key_state);
+ }
+ GNUNET_CRYPTO_hash (coin_ev,
+ coin_ev_size,
+ &pc.h_blind);
+ GNUNET_free (coin_ev);
+
+ /* make sure coin is 'known' in database */
+ {
+ struct TEH_DB_KnowCoinContext kcc;
+ int mhd_ret;
+
+ kcc.coin = coin;
+ kcc.connection = connection;
+ if (GNUNET_OK !=
+ TEH_DB_run_transaction (connection,
+ "know coin for recoup",
+ &mhd_ret,
+ &TEH_DB_know_coin_transaction,
+ &kcc))
+ return mhd_ret;
+ }
+
+ pc.coin_sig = coin_sig;
+ pc.coin_bks = coin_bks;
+ pc.coin = coin;
+ pc.refreshed = refreshed;
+ {
+ int mhd_ret;
+
+ if (GNUNET_OK !=
+ TEH_DB_run_transaction (connection,
+ "run recoup",
+ &mhd_ret,
+ &recoup_transaction,
+ &pc))
+ return mhd_ret;
+ }
+ return (refreshed)
+ ? reply_recoup_refresh_success (connection,
+ &coin->coin_pub,
+ &pc.target.old_coin_pub,
+ &pc.amount,
+ pc.now)
+ : reply_recoup_success (connection,
+ &coin->coin_pub,
+ &pc.target.reserve_pub,
+ &pc.amount,
+ pc.now);
+}
+
+
+/**
+ * Handle a "/recoup" request. Parses the JSON, and, if successful,
+ * passes the JSON data to #verify_and_execute_recoup() to
+ * further check the details of the operation specified. If
+ * everything checks out, this will ultimately lead to the "/refund"
+ * being executed, or rejected.
+ *
+ * @param rh context of the handler
+ * @param connection the MHD connection to handle
+ * @param[in,out] connection_cls the connection's closure (can be updated)
+ * @param upload_data upload data
+ * @param[in,out] upload_data_size number of bytes (left) in @a upload_data
+ * @return MHD result code
+ */
+int
+TEH_RECOUP_handler_recoup (struct TEH_RequestHandler *rh,
+ struct MHD_Connection *connection,
+ void **connection_cls,
+ const char *upload_data,
+ size_t *upload_data_size)
+{
+ json_t *json;
+ int res;
+ struct TALER_CoinPublicInfo coin;
+ struct TALER_DenominationBlindingKeyP coin_bks;
+ struct TALER_CoinSpendSignatureP coin_sig;
+ int refreshed = GNUNET_NO;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_fixed_auto ("denom_pub_hash",
+ &coin.denom_pub_hash),
+ TALER_JSON_spec_denomination_signature ("denom_sig",
+ &coin.denom_sig),
+ GNUNET_JSON_spec_fixed_auto ("coin_pub",
+ &coin.coin_pub),
+ GNUNET_JSON_spec_fixed_auto ("coin_blind_key_secret",
+ &coin_bks),
+ GNUNET_JSON_spec_fixed_auto ("coin_sig",
+ &coin_sig),
+ GNUNET_JSON_spec_mark_optional
+ (GNUNET_JSON_spec_boolean ("refreshed",
+ &refreshed)),
+ GNUNET_JSON_spec_end ()
+ };
+
+ (void) rh;
+ res = TALER_MHD_parse_post_json (connection,
+ connection_cls,
+ upload_data,
+ upload_data_size,
+ &json);
+ if (GNUNET_SYSERR == res)
+ return MHD_NO;
+ if ( (GNUNET_NO == res) || (NULL == json) )
+ return MHD_YES;
+ res = TALER_MHD_parse_json_data (connection,
+ json,
+ spec);
+ json_decref (json);
+ if (GNUNET_SYSERR == res)
+ return MHD_NO; /* hard failure */
+ if (GNUNET_NO == res)
+ return MHD_YES; /* failure */
+ res = verify_and_execute_recoup (connection,
+ &coin,
+ &coin_bks,
+ &coin_sig,
+ refreshed);
+ GNUNET_JSON_parse_free (spec);
+ return res;
+}
+
+
+/* end of taler-exchange-httpd_recoup.c */