351 lines
13 KiB
C
351 lines
13 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014-2020 Taler Systems SA
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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 Affero 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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file taler-auditor-httpd_deposit-confirmation.c
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* @brief Handle /deposit-confirmation requests; parses the POST and JSON and
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* verifies the coin signature before handing things off
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* to the database.
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* @author Christian Grothoff
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*/
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#include "platform.h"
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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 <jansson.h>
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#include <microhttpd.h>
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#include <pthread.h>
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#include "taler_json_lib.h"
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#include "taler_mhd_lib.h"
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#include "taler-auditor-httpd.h"
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#include "taler-auditor-httpd_deposit-confirmation.h"
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/**
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* Cache of already verified exchange signing keys. Maps the hash of the
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* `struct TALER_ExchangeSigningKeyValidityPS` to the (static) string
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* "verified" or "revoked". Access to this map is guarded by the #lock.
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*/
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static struct GNUNET_CONTAINER_MultiHashMap *cache;
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/**
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* Lock for operations on #cache.
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*/
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static pthread_mutex_t lock;
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/**
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* We have parsed the JSON information about the deposit, do some
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* basic sanity checks (especially that the signature on the coin is
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* valid, and that this type of coin exists) and then execute the
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* deposit.
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*
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* @param connection the MHD connection to handle
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* @param dc information about the deposit confirmation
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* @param es information about the exchange's signing key
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* @return MHD result code
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*/
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static MHD_RESULT
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verify_and_execute_deposit_confirmation (
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struct MHD_Connection *connection,
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const struct TALER_AUDITORDB_DepositConfirmation *dc,
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const struct TALER_AUDITORDB_ExchangeSigningKey *es)
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{
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enum GNUNET_DB_QueryStatus qs;
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struct GNUNET_HashCode h;
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const char *cached;
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struct TALER_ExchangeSigningKeyValidityPS skv = {
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.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY),
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.purpose.size = htonl (sizeof (struct TALER_ExchangeSigningKeyValidityPS)),
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.start = GNUNET_TIME_timestamp_hton (es->ep_start),
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.expire = GNUNET_TIME_timestamp_hton (es->ep_expire),
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.end = GNUNET_TIME_timestamp_hton (es->ep_end),
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.signkey_pub = es->exchange_pub
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};
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if (GNUNET_TIME_absolute_is_future (es->ep_start.abs_time) ||
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GNUNET_TIME_absolute_is_past (es->ep_expire.abs_time) )
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{
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/* Signing key expired */
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TALER_LOG_WARNING ("Expired exchange signing key\n");
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_FORBIDDEN,
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TALER_EC_AUDITOR_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
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"master signature expired");
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}
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/* check our cache */
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GNUNET_CRYPTO_hash (&skv,
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sizeof (skv),
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&h);
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GNUNET_assert (0 == pthread_mutex_lock (&lock));
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cached = GNUNET_CONTAINER_multihashmap_get (cache,
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&h);
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GNUNET_assert (0 == pthread_mutex_unlock (&lock));
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if (GNUNET_SYSERR ==
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TAH_plugin->preflight (TAH_plugin->cls))
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{
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GNUNET_break (0);
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_SETUP_FAILED,
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NULL);
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}
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if (NULL == cached)
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{
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/* Not in cache, need to verify the signature, persist it, and possibly cache it */
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if (GNUNET_OK !=
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TALER_exchange_offline_signkey_validity_verify (
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&es->exchange_pub,
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es->ep_start,
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es->ep_expire,
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es->ep_end,
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&es->master_public_key,
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&es->master_sig))
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{
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TALER_LOG_WARNING ("Invalid signature on exchange signing key\n");
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_FORBIDDEN,
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TALER_EC_AUDITOR_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
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"master signature invalid");
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}
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/* execute transaction */
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qs = TAH_plugin->insert_exchange_signkey (TAH_plugin->cls,
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es);
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if (0 > qs)
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{
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GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
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TALER_LOG_WARNING ("Failed to store exchange signing key in database\n");
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_STORE_FAILED,
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"exchange signing key");
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}
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cached = "verified";
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}
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if (0 == strcmp (cached,
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"verified"))
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{
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struct TALER_MasterSignatureP master_sig;
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/* check for revocation */
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qs = TAH_eplugin->lookup_signkey_revocation (TAH_eplugin->cls,
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&es->exchange_pub,
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&master_sig);
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if (0 > qs)
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{
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GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
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TALER_LOG_WARNING (
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"Failed to check for signing key revocation in database\n");
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_FETCH_FAILED,
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"exchange signing key revocation");
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}
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if (0 < qs)
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cached = "revoked";
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}
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/* Cache it, due to concurreny it might already be in the cache,
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so we do not cache it twice but also don't insist on the 'put' to
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succeed. */
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GNUNET_assert (0 == pthread_mutex_lock (&lock));
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(void) GNUNET_CONTAINER_multihashmap_put (cache,
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&h,
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(void *) cached,
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GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
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GNUNET_assert (0 == pthread_mutex_unlock (&lock));
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if (0 == strcmp (cached,
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"revoked"))
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{
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TALER_LOG_WARNING (
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"Invalid signature on /deposit-confirmation request: key was revoked\n");
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_GONE,
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TALER_EC_AUDITOR_EXCHANGE_SIGNING_KEY_REVOKED,
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"exchange signing key was revoked");
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}
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/* check deposit confirmation signature */
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if (GNUNET_OK !=
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TALER_exchange_deposit_confirm_verify (&dc->h_contract_terms,
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&dc->h_wire,
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NULL /* h_extensions! */,
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dc->exchange_timestamp,
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dc->wire_deadline,
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dc->refund_deadline,
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&dc->amount_without_fee,
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&dc->coin_pub,
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&dc->merchant,
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&dc->exchange_pub,
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&dc->exchange_sig))
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{
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TALER_LOG_WARNING (
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"Invalid signature on /deposit-confirmation request\n");
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_FORBIDDEN,
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TALER_EC_AUDITOR_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
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"exchange signature invalid");
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}
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/* execute transaction */
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qs = TAH_plugin->insert_deposit_confirmation (TAH_plugin->cls,
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dc);
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if (0 > qs)
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{
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GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
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TALER_LOG_WARNING ("Failed to store /deposit-confirmation in database\n");
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return TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_STORE_FAILED,
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"deposit confirmation");
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}
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return TALER_MHD_REPLY_JSON_PACK (connection,
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MHD_HTTP_OK,
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GNUNET_JSON_pack_string ("status",
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"DEPOSIT_CONFIRMATION_OK"));
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}
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/**
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* Handle a "/deposit-confirmation" request. Parses the JSON, and, if
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* successful, passes the JSON data to #verify_and_execute_deposit_confirmation()
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* to further check the details of the operation specified. If
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* everything checks out, this will ultimately lead to the "/deposit-confirmation"
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* being stored in the database.
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*
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* @param rh context of the handler
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* @param connection the MHD connection to handle
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* @param[in,out] connection_cls the connection's closure (can be updated)
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* @param upload_data upload data
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* @param[in,out] upload_data_size number of bytes (left) in @a upload_data
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* @return MHD result code
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*/
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MHD_RESULT
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TAH_DEPOSIT_CONFIRMATION_handler (struct TAH_RequestHandler *rh,
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struct MHD_Connection *connection,
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void **connection_cls,
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const char *upload_data,
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size_t *upload_data_size)
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{
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struct TALER_AUDITORDB_DepositConfirmation dc;
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struct TALER_AUDITORDB_ExchangeSigningKey es;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_fixed_auto ("h_contract_terms",
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&dc.h_contract_terms),
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GNUNET_JSON_spec_fixed_auto ("h_extensions",
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&dc.h_extensions),
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GNUNET_JSON_spec_fixed_auto ("h_wire",
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&dc.h_wire),
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GNUNET_JSON_spec_timestamp ("exchange_timestamp",
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&dc.exchange_timestamp),
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GNUNET_JSON_spec_timestamp ("refund_deadline",
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&dc.refund_deadline),
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GNUNET_JSON_spec_timestamp ("wire_deadline",
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&dc.wire_deadline),
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TALER_JSON_spec_amount ("amount_without_fee",
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TAH_currency,
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&dc.amount_without_fee),
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GNUNET_JSON_spec_fixed_auto ("coin_pub",
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&dc.coin_pub),
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GNUNET_JSON_spec_fixed_auto ("merchant_pub",
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&dc.merchant),
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GNUNET_JSON_spec_fixed_auto ("exchange_sig",
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&dc.exchange_sig),
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GNUNET_JSON_spec_fixed_auto ("exchange_pub",
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&dc.exchange_pub),
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GNUNET_JSON_spec_fixed_auto ("master_pub",
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&es.master_public_key),
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GNUNET_JSON_spec_timestamp ("ep_start",
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&es.ep_start),
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GNUNET_JSON_spec_timestamp ("ep_expire",
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&es.ep_expire),
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GNUNET_JSON_spec_timestamp ("ep_end",
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&es.ep_end),
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GNUNET_JSON_spec_fixed_auto ("master_sig",
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&es.master_sig),
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GNUNET_JSON_spec_end ()
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};
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(void) rh;
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(void) connection_cls;
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(void) upload_data;
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(void) upload_data_size;
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{
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json_t *json;
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enum GNUNET_GenericReturnValue res;
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res = TALER_MHD_parse_post_json (connection,
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connection_cls,
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upload_data,
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upload_data_size,
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&json);
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if (GNUNET_SYSERR == res)
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return MHD_NO;
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if ( (GNUNET_NO == res) ||
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(NULL == json) )
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return MHD_YES;
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res = TALER_MHD_parse_json_data (connection,
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json,
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spec);
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json_decref (json);
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if (GNUNET_SYSERR == res)
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return MHD_NO; /* hard failure */
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if (GNUNET_NO == res)
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return MHD_YES; /* failure */
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}
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es.exchange_pub = dc.exchange_pub; /* used twice! */
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dc.master_public_key = es.master_public_key;
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{
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MHD_RESULT res;
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res = verify_and_execute_deposit_confirmation (connection,
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&dc,
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&es);
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GNUNET_JSON_parse_free (spec);
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return res;
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}
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}
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/**
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* Initialize subsystem.
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*/
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void
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TEAH_DEPOSIT_CONFIRMATION_init (void)
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{
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cache = GNUNET_CONTAINER_multihashmap_create (32,
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GNUNET_NO);
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GNUNET_assert (0 == pthread_mutex_init (&lock, NULL));
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}
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/**
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* Shut down subsystem.
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*/
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void
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TEAH_DEPOSIT_CONFIRMATION_done (void)
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{
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GNUNET_CONTAINER_multihashmap_destroy (cache);
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cache = NULL;
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GNUNET_assert (0 == pthread_mutex_destroy (&lock));
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}
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/* end of taler-auditor-httpd_deposit-confirmation.c */
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