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4bba726356
exchange/src/auditor/taler-auditor-httpd_deposit-confirmation.c
Christian Grothoff 4bba726356
nicer generic error reporting logic, for #6432
2020-08-25 15:11:56 +02:00

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/*
This file is part of TALER
Copyright (C) 2014-2020 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-auditor-httpd_deposit-confirmation.c
* @brief Handle /deposit-confirmation 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-auditor-httpd.h"
#include "taler-auditor-httpd_deposit-confirmation.h"
/**
* Cache of already verified exchange signing keys. Maps the hash of the
* `struct TALER_ExchangeSigningKeyValidityPS` to the (static) string
* "verified". Access to this map is guarded by the #lock.
*/
static struct GNUNET_CONTAINER_MultiHashMap *cache;
/**
* Lock for operations on #cache.
*/
static pthread_mutex_t lock;
/**
* We have parsed the JSON information about the deposit, do some
* basic sanity checks (especially that the signature on the coin is
* valid, and that this type of coin exists) and then execute the
* deposit.
*
* @param connection the MHD connection to handle
* @param dc information about the deposit confirmation
* @param es information about the exchange's signing key
* @return MHD result code
*/
static MHD_RESULT
verify_and_execute_deposit_confirmation (
struct MHD_Connection *connection,
const struct TALER_AUDITORDB_DepositConfirmation *dc,
const struct TALER_AUDITORDB_ExchangeSigningKey *es)
{
struct TALER_AUDITORDB_Session *session;
enum GNUNET_DB_QueryStatus qs;
struct GNUNET_TIME_Absolute now;
struct GNUNET_HashCode h;
int cached;
struct TALER_ExchangeSigningKeyValidityPS skv = {
.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY),
.purpose.size = htonl (sizeof (struct TALER_ExchangeSigningKeyValidityPS)),
.master_public_key = es->master_public_key,
.start = GNUNET_TIME_absolute_hton (es->ep_start),
.expire = GNUNET_TIME_absolute_hton (es->ep_expire),
.end = GNUNET_TIME_absolute_hton (es->ep_end),
.signkey_pub = es->exchange_pub
};
now = GNUNET_TIME_absolute_get ();
if ( (es->ep_start.abs_value_us > now.abs_value_us) ||
(es->ep_expire.abs_value_us < now.abs_value_us) )
{
/* Signing key expired */
TALER_LOG_WARNING ("Expired exchange signing key\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
"master signature expired");
}
/* check our cache */
GNUNET_CRYPTO_hash (&skv,
sizeof (skv),
&h);
GNUNET_assert (0 == pthread_mutex_lock (&lock));
cached = GNUNET_CONTAINER_multihashmap_contains (cache,
&h);
GNUNET_assert (0 == pthread_mutex_unlock (&lock));
session = TAH_plugin->get_session (TAH_plugin->cls);
if (NULL == session)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_DB_SETUP_FAILED,
NULL);
}
if (! cached)
{
/* Not in cache, need to verify the signature, persist it, and possibly cache it */
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_SIGNING_KEY_VALIDITY,
&skv,
&es->master_sig.eddsa_signature,
&es->master_public_key.eddsa_pub))
{
TALER_LOG_WARNING ("Invalid signature on exchange signing key\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
"master signature invalid");
}
/* execute transaction */
qs = TAH_plugin->insert_exchange_signkey (TAH_plugin->cls,
session,
es);
if (0 > qs)
{
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
TALER_LOG_WARNING ("Failed to store exchange signing key in database\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_AUDITOR_EXCHANGE_STORE_DB_ERROR,
NULL);
}
/* Cache it, due to concurreny it might already be in the cache,
so we do not cache it twice but also don't insist on the 'put' to
succeed. */
GNUNET_assert (0 == pthread_mutex_lock (&lock));
(void) GNUNET_CONTAINER_multihashmap_put (cache,
&h,
"verified",
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
GNUNET_assert (0 == pthread_mutex_unlock (&lock));
}
/* check deposit confirmation signature */
{
struct TALER_DepositConfirmationPS dcs = {
.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT),
.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS)),
.h_contract_terms = dc->h_contract_terms,
.h_wire = dc->h_wire,
.exchange_timestamp = GNUNET_TIME_absolute_hton (dc->exchange_timestamp),
.refund_deadline = GNUNET_TIME_absolute_hton (dc->refund_deadline),
.coin_pub = dc->coin_pub,
.merchant = dc->merchant
};
TALER_amount_hton (&dcs.amount_without_fee,
&dc->amount_without_fee);
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_EXCHANGE_CONFIRM_DEPOSIT,
&dcs,
&dc->exchange_sig.eddsa_signature,
&dc->exchange_pub.eddsa_pub))
{
TALER_LOG_WARNING (
"Invalid signature on /deposit-confirmation request\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_DEPOSIT_CONFIRMATION_SIGNATURE_INVALID,
"exchange signature invalid");
}
}
/* execute transaction */
qs = TAH_plugin->insert_deposit_confirmation (TAH_plugin->cls,
session,
dc);
if (0 > qs)
{
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
TALER_LOG_WARNING ("Failed to store /deposit-confirmation in database\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_DEPOSIT_CONFIRMATION_STORE_DB_ERROR,
NULL);
}
return TALER_MHD_reply_json_pack (connection,
MHD_HTTP_OK,
"{s:s}",
"status", "DEPOSIT_CONFIRMATION_OK");
}
/**
* Handle a "/deposit-confirmation" request. Parses the JSON, and, if
* successful, passes the JSON data to #verify_and_execute_deposit_confirmation()
* to further check the details of the operation specified. If
* everything checks out, this will ultimately lead to the "/deposit-confirmation"
* being stored in the database.
*
* @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
*/
MHD_RESULT
TAH_DEPOSIT_CONFIRMATION_handler (struct TAH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
struct TALER_AUDITORDB_DepositConfirmation dc;
struct TALER_AUDITORDB_ExchangeSigningKey es;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("h_contract_terms", &dc.h_contract_terms),
GNUNET_JSON_spec_fixed_auto ("h_wire", &dc.h_wire),
TALER_JSON_spec_absolute_time ("exchange_timestamp",
&dc.exchange_timestamp),
TALER_JSON_spec_absolute_time ("refund_deadline", &dc.refund_deadline),
TALER_JSON_spec_amount ("amount_without_fee", &dc.amount_without_fee),
GNUNET_JSON_spec_fixed_auto ("coin_pub", &dc.coin_pub),
GNUNET_JSON_spec_fixed_auto ("merchant_pub", &dc.merchant),
GNUNET_JSON_spec_fixed_auto ("exchange_sig", &dc.exchange_sig),
GNUNET_JSON_spec_fixed_auto ("exchange_pub", &dc.exchange_pub),
GNUNET_JSON_spec_fixed_auto ("master_pub", &es.master_public_key),
TALER_JSON_spec_absolute_time ("ep_start", &es.ep_start),
TALER_JSON_spec_absolute_time ("ep_expire", &es.ep_expire),
TALER_JSON_spec_absolute_time ("ep_end", &es.ep_end),
GNUNET_JSON_spec_fixed_auto ("master_sig", &es.master_sig),
GNUNET_JSON_spec_end ()
};
(void) rh;
(void) connection_cls;
(void) upload_data;
(void) upload_data_size;
{
json_t *json;
enum GNUNET_GenericReturnValue res;
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 */
}
es.exchange_pub = dc.exchange_pub; /* used twice! */
dc.master_public_key = es.master_public_key;
{
MHD_RESULT res;
res = verify_and_execute_deposit_confirmation (connection,
&dc,
&es);
GNUNET_JSON_parse_free (spec);
return res;
}
}
/**
* Initialize subsystem.
*/
void
TEAH_DEPOSIT_CONFIRMATION_init (void)
{
cache = GNUNET_CONTAINER_multihashmap_create (32,
GNUNET_NO);
GNUNET_assert (0 == pthread_mutex_init (&lock, NULL));
}
/**
* Shut down subsystem.
*/
void
TEAH_DEPOSIT_CONFIRMATION_done (void)
{
GNUNET_CONTAINER_multihashmap_destroy (cache);
cache = NULL;
GNUNET_assert (0 == pthread_mutex_destroy (&lock));
}
/* end of taler-auditor-httpd_deposit-confirmation.c */
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