diff options
Diffstat (limited to 'src/exchange/taler-exchange-httpd_withdraw.c')
| -rw-r--r-- | src/exchange/taler-exchange-httpd_withdraw.c | 543 |
1 files changed, 0 insertions, 543 deletions
diff --git a/src/exchange/taler-exchange-httpd_withdraw.c b/src/exchange/taler-exchange-httpd_withdraw.c deleted file mode 100644 index 53ba270ba..000000000 --- a/src/exchange/taler-exchange-httpd_withdraw.c +++ /dev/null @@ -1,543 +0,0 @@ -/* - This file is part of TALER - Copyright (C) 2014-2021 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_withdraw.c - * @brief Handle /reserves/$RESERVE_PUB/withdraw requests - * @author Florian Dold - * @author Benedikt Mueller - * @author Christian Grothoff - */ -#include "platform.h" -#include <gnunet/gnunet_util_lib.h> -#include <jansson.h> -#include "taler_json_lib.h" -#include "taler_mhd_lib.h" -#include "taler-exchange-httpd_withdraw.h" -#include "taler-exchange-httpd_responses.h" -#include "taler-exchange-httpd_keys.h" - - -/** - * Send reserve history information to client with the - * message that we have insufficient funds for the - * requested withdraw operation. - * - * @param connection connection to the client - * @param ebalance expected balance based on our database - * @param withdraw_amount amount that the client requested to withdraw - * @param rh reserve history to return - * @return MHD result code - */ -static MHD_RESULT -reply_withdraw_insufficient_funds ( - struct MHD_Connection *connection, - const struct TALER_Amount *ebalance, - const struct TALER_Amount *withdraw_amount, - const struct TALER_EXCHANGEDB_ReserveHistory *rh) -{ - json_t *json_history; - struct TALER_Amount balance; - - json_history = TEH_RESPONSE_compile_reserve_history (rh, - &balance); - if (NULL == json_history) - return TALER_MHD_reply_with_error (connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_EXCHANGE_WITHDRAW_HISTORY_ERROR_INSUFFICIENT_FUNDS, - NULL); - if (0 != - TALER_amount_cmp (&balance, - ebalance)) - { - GNUNET_break (0); - json_decref (json_history); - return TALER_MHD_reply_with_error (connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_GENERIC_DB_INVARIANT_FAILURE, - "reserve balance corrupt"); - } - return TALER_MHD_REPLY_JSON_PACK ( - connection, - MHD_HTTP_CONFLICT, - TALER_JSON_pack_ec (TALER_EC_EXCHANGE_WITHDRAW_INSUFFICIENT_FUNDS), - TALER_JSON_pack_amount ("balance", - &balance), - TALER_JSON_pack_amount ("requested_amount", - withdraw_amount), - GNUNET_JSON_pack_array_steal ("history", - json_history)); -} - - -/** - * Context for #withdraw_transaction. - */ -struct WithdrawContext -{ - /** - * Details about the withdrawal request. - */ - struct TALER_WithdrawRequestPS wsrd; - - /** - * Blinded planchet. - */ - void *blinded_msg; - - /** - * Number of bytes in @e blinded_msg. - */ - size_t blinded_msg_len; - - /** - * Set to the resulting signed coin data to be returned to the client. - */ - struct TALER_EXCHANGEDB_CollectableBlindcoin collectable; - - /** - * KYC status for the operation. - */ - struct TALER_EXCHANGEDB_KycStatus kyc; - -}; - - -/** - * Function implementing withdraw transaction. Runs the - * transaction logic; 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. - * - * Note that "wc->collectable.sig" is set before entering this function as we - * signed before entering the transaction. - * - * @param cls a `struct WithdrawContext *` - * @param connection MHD request which triggered the transaction - * @param[out] mhd_ret set to MHD response status for @a connection, - * if transaction failed (!) - * @return transaction status - */ -static enum GNUNET_DB_QueryStatus -withdraw_transaction (void *cls, - struct MHD_Connection *connection, - MHD_RESULT *mhd_ret) -{ - struct WithdrawContext *wc = cls; - enum GNUNET_DB_QueryStatus qs; - bool found = false; - bool balance_ok = false; - struct GNUNET_TIME_Timestamp now; - uint64_t ruuid; - - now = GNUNET_TIME_timestamp_get (); - wc->collectable.reserve_pub = wc->wsrd.reserve_pub; - wc->collectable.h_coin_envelope = wc->wsrd.h_coin_envelope; - qs = TEH_plugin->do_withdraw (TEH_plugin->cls, - &wc->collectable, - now, - &found, - &balance_ok, - &wc->kyc, - &ruuid); - if (0 > qs) - { - if (GNUNET_DB_STATUS_HARD_ERROR == qs) - *mhd_ret = TALER_MHD_reply_with_error (connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_GENERIC_DB_FETCH_FAILED, - "do_withdraw"); - return qs; - } - if (! found) - { - *mhd_ret = TALER_MHD_reply_with_error (connection, - MHD_HTTP_NOT_FOUND, - TALER_EC_EXCHANGE_WITHDRAW_RESERVE_UNKNOWN, - NULL); - return GNUNET_DB_STATUS_HARD_ERROR; - } - if (! balance_ok) - { - struct TALER_EXCHANGEDB_ReserveHistory *rh; - struct TALER_Amount balance; - struct TALER_Amount requested_amount; - - TEH_plugin->rollback (TEH_plugin->cls); - // FIXME: maybe start read-committed here? - if (GNUNET_OK != - TEH_plugin->start (TEH_plugin->cls, - "get_reserve_history on insufficient balance")) - { - GNUNET_break (0); - if (NULL != mhd_ret) - *mhd_ret = TALER_MHD_reply_with_error (connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_GENERIC_DB_START_FAILED, - NULL); - return GNUNET_DB_STATUS_HARD_ERROR; - } - /* The reserve does not have the required amount (actual - * amount + withdraw fee) */ - qs = TEH_plugin->get_reserve_history (TEH_plugin->cls, - &wc->wsrd.reserve_pub, - &balance, - &rh); - if (NULL == rh) - { - if (GNUNET_DB_STATUS_HARD_ERROR == qs) - *mhd_ret = TALER_MHD_reply_with_error (connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_GENERIC_DB_FETCH_FAILED, - "reserve history"); - return GNUNET_DB_STATUS_HARD_ERROR; - } - TALER_amount_ntoh (&requested_amount, - &wc->wsrd.amount_with_fee); - *mhd_ret = reply_withdraw_insufficient_funds (connection, - &balance, - &requested_amount, - rh); - TEH_plugin->free_reserve_history (TEH_plugin->cls, - rh); - return GNUNET_DB_STATUS_HARD_ERROR; - } - - if ( (TEH_KYC_NONE != TEH_kyc_config.mode) && - (! wc->kyc.ok) && - (TALER_EXCHANGEDB_KYC_W2W == wc->kyc.type) ) - { - /* Wallet-to-wallet payments _always_ require KYC */ - *mhd_ret = TALER_MHD_REPLY_JSON_PACK ( - connection, - MHD_HTTP_ACCEPTED, - GNUNET_JSON_pack_uint64 ("payment_target_uuid", - wc->kyc.payment_target_uuid)); - return GNUNET_DB_STATUS_HARD_ERROR; - } - if ( (TEH_KYC_NONE != TEH_kyc_config.mode) && - (! wc->kyc.ok) && - (TALER_EXCHANGEDB_KYC_WITHDRAW == wc->kyc.type) && - (! GNUNET_TIME_relative_is_zero (TEH_kyc_config.withdraw_period)) ) - { - /* Withdraws require KYC if above threshold */ - enum GNUNET_DB_QueryStatus qs2; - bool below_limit; - - qs2 = TEH_plugin->do_withdraw_limit_check ( - TEH_plugin->cls, - ruuid, - GNUNET_TIME_absolute_subtract (now.abs_time, - TEH_kyc_config.withdraw_period), - &TEH_kyc_config.withdraw_limit, - &below_limit); - if (0 > qs2) - { - GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs2); - if (GNUNET_DB_STATUS_HARD_ERROR == qs2) - *mhd_ret = TALER_MHD_reply_with_error (connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_GENERIC_DB_FETCH_FAILED, - "do_withdraw_limit_check"); - return qs2; - } - if (! below_limit) - { - TEH_plugin->rollback (TEH_plugin->cls); - *mhd_ret = TALER_MHD_REPLY_JSON_PACK ( - connection, - MHD_HTTP_ACCEPTED, - GNUNET_JSON_pack_uint64 ("payment_target_uuid", - wc->kyc.payment_target_uuid)); - return GNUNET_DB_STATUS_HARD_ERROR; - } - } - return qs; -} - - -/** - * Check if the @a rc is replayed and we already have an - * answer. If so, replay the existing answer and return the - * HTTP response. - * - * @param rc request context - * @param[in,out] wc parsed request data - * @param[out] mret HTTP status, set if we return true - * @return true if the request is idempotent with an existing request - * false if we did not find the request in the DB and did not set @a mret - */ -static bool -check_request_idempotent (struct TEH_RequestContext *rc, - struct WithdrawContext *wc, - MHD_RESULT *mret) -{ - enum GNUNET_DB_QueryStatus qs; - - qs = TEH_plugin->get_withdraw_info (TEH_plugin->cls, - &wc->wsrd.h_coin_envelope, - &wc->collectable); - if (0 > qs) - { - GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs); - if (GNUNET_DB_STATUS_HARD_ERROR == qs) - *mret = TALER_MHD_reply_with_error (rc->connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_GENERIC_DB_FETCH_FAILED, - "get_withdraw_info"); - return true; /* well, kind-of */ - } - if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs) - return false; - /* generate idempotent reply */ - *mret = TALER_MHD_REPLY_JSON_PACK ( - rc->connection, - MHD_HTTP_OK, - TALER_JSON_pack_blinded_denom_sig ("ev_sig", - &wc->collectable.sig)); - TALER_blinded_denom_sig_free (&wc->collectable.sig); - return true; -} - - -MHD_RESULT -TEH_handler_withdraw (struct TEH_RequestContext *rc, - const json_t *root, - const char *const args[2]) -{ - struct WithdrawContext wc; - struct GNUNET_JSON_Specification spec[] = { - GNUNET_JSON_spec_varsize ("coin_ev", - &wc.blinded_msg, - &wc.blinded_msg_len), - GNUNET_JSON_spec_fixed_auto ("reserve_sig", - &wc.collectable.reserve_sig), - GNUNET_JSON_spec_fixed_auto ("denom_pub_hash", - &wc.collectable.denom_pub_hash), - GNUNET_JSON_spec_end () - }; - enum TALER_ErrorCode ec; - struct TEH_DenominationKey *dk; - - memset (&wc, - 0, - sizeof (wc)); - if (GNUNET_OK != - GNUNET_STRINGS_string_to_data (args[0], - strlen (args[0]), - &wc.wsrd.reserve_pub, - sizeof (wc.wsrd.reserve_pub))) - { - GNUNET_break_op (0); - return TALER_MHD_reply_with_error (rc->connection, - MHD_HTTP_BAD_REQUEST, - TALER_EC_MERCHANT_GENERIC_RESERVE_PUB_MALFORMED, - args[0]); - } - - { - enum GNUNET_GenericReturnValue res; - - res = TALER_MHD_parse_json_data (rc->connection, - root, - spec); - if (GNUNET_OK != res) - return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES; - } - { - MHD_RESULT mret; - struct TEH_KeyStateHandle *ksh; - - ksh = TEH_keys_get_state (); - if (NULL == ksh) - { - if (! check_request_idempotent (rc, - &wc, - &mret)) - { - GNUNET_JSON_parse_free (spec); - return TALER_MHD_reply_with_error (rc->connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_EXCHANGE_GENERIC_KEYS_MISSING, - NULL); - } - GNUNET_JSON_parse_free (spec); - return mret; - } - dk = TEH_keys_denomination_by_hash2 (ksh, - &wc.collectable.denom_pub_hash, - NULL, - NULL); - if (NULL == dk) - { - if (! check_request_idempotent (rc, - &wc, - &mret)) - { - GNUNET_JSON_parse_free (spec); - return TEH_RESPONSE_reply_unknown_denom_pub_hash ( - rc->connection, - &wc.collectable.denom_pub_hash); - } - GNUNET_JSON_parse_free (spec); - return mret; - } - if (GNUNET_TIME_absolute_is_past (dk->meta.expire_withdraw.abs_time)) - { - /* This denomination is past the expiration time for withdraws */ - if (! check_request_idempotent (rc, - &wc, - &mret)) - { - GNUNET_JSON_parse_free (spec); - return TEH_RESPONSE_reply_expired_denom_pub_hash ( - rc->connection, - &wc.collectable.denom_pub_hash, - TALER_EC_EXCHANGE_GENERIC_DENOMINATION_EXPIRED, - "WITHDRAW"); - } - GNUNET_JSON_parse_free (spec); - return mret; - } - if (GNUNET_TIME_absolute_is_future (dk->meta.start.abs_time)) - { - /* This denomination is not yet valid, no need to check - for idempotency! */ - GNUNET_JSON_parse_free (spec); - return TEH_RESPONSE_reply_expired_denom_pub_hash ( - rc->connection, - &wc.collectable.denom_pub_hash, - TALER_EC_EXCHANGE_GENERIC_DENOMINATION_VALIDITY_IN_FUTURE, - "WITHDRAW"); - } - if (dk->recoup_possible) - { - /* This denomination has been revoked */ - if (! check_request_idempotent (rc, - &wc, - &mret)) - { - GNUNET_JSON_parse_free (spec); - return TEH_RESPONSE_reply_expired_denom_pub_hash ( - rc->connection, - &wc.collectable.denom_pub_hash, - TALER_EC_EXCHANGE_GENERIC_DENOMINATION_REVOKED, - "WITHDRAW"); - } - GNUNET_JSON_parse_free (spec); - return mret; - } - } - - if (0 > - TALER_amount_add (&wc.collectable.amount_with_fee, - &dk->meta.value, - &dk->meta.fee_withdraw)) - { - GNUNET_JSON_parse_free (spec); - return TALER_MHD_reply_with_error (rc->connection, - MHD_HTTP_INTERNAL_SERVER_ERROR, - TALER_EC_EXCHANGE_WITHDRAW_AMOUNT_FEE_OVERFLOW, - NULL); - } - TALER_amount_hton (&wc.wsrd.amount_with_fee, - &wc.collectable.amount_with_fee); - - // FIXME: move this logic into libtalerutil! - /* verify signature! */ - wc.wsrd.purpose.size - = htonl (sizeof (wc.wsrd)); - wc.wsrd.purpose.purpose - = htonl (TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW); - wc.wsrd.h_denomination_pub - = wc.collectable.denom_pub_hash; - TALER_coin_ev_hash (wc.blinded_msg, - wc.blinded_msg_len, - &wc.wsrd.h_coin_envelope); - if (GNUNET_OK != - GNUNET_CRYPTO_eddsa_verify ( - TALER_SIGNATURE_WALLET_RESERVE_WITHDRAW, - &wc.wsrd, - &wc.collectable.reserve_sig.eddsa_signature, - &wc.wsrd.reserve_pub.eddsa_pub)) - { - TALER_LOG_WARNING ( - "Client supplied invalid signature for withdraw request\n"); - GNUNET_JSON_parse_free (spec); - return TALER_MHD_reply_with_error (rc->connection, - MHD_HTTP_FORBIDDEN, - TALER_EC_EXCHANGE_WITHDRAW_RESERVE_SIGNATURE_INVALID, - NULL); - } - - /* Sign before transaction! */ - ec = TALER_EC_NONE; - wc.collectable.sig - = TEH_keys_denomination_sign (&wc.collectable.denom_pub_hash, - wc.blinded_msg, - wc.blinded_msg_len, - &ec); - if (TALER_EC_NONE != ec) - { - GNUNET_break (0); - GNUNET_JSON_parse_free (spec); - return TALER_MHD_reply_with_ec (rc->connection, - ec, - NULL); - } - - /* run transaction */ - { - MHD_RESULT mhd_ret; - - if (GNUNET_OK != - TEH_DB_run_transaction (rc->connection, - "run withdraw", - TEH_MT_WITHDRAW, - &mhd_ret, - &withdraw_transaction, - &wc)) - { - /* Even if #withdraw_transaction() failed, it may have created a signature - (or we might have done it optimistically above). */ - TALER_blinded_denom_sig_free (&wc.collectable.sig); - GNUNET_JSON_parse_free (spec); - return mhd_ret; - } - } - - /* Clean up and send back final response */ - GNUNET_JSON_parse_free (spec); - - { - MHD_RESULT ret; - - ret = TALER_MHD_REPLY_JSON_PACK ( - rc->connection, - MHD_HTTP_OK, - TALER_JSON_pack_blinded_denom_sig ("ev_sig", - &wc.collectable.sig)); - TALER_blinded_denom_sig_free (&wc.collectable.sig); - return ret; - } -} - - -/* end of taler-exchange-httpd_withdraw.c */ |