implement exchange_api_reserves_attest.c
This commit is contained in:
Christian Grothoff
parent
33680940fe
commit
2635f2e0b8
@ -3201,7 +3201,13 @@ TALER_wallet_account_setup_verify (
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/**
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* FIXME.
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* Sign request to the exchange to confirm certain
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* @a details about the owner of a reserve.
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*
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* @param request_timestamp when was the request created
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* @param details which attributes are requested
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* @param reserve_priv private key of the reserve
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* @param[out] reserve_sig where to store the signature
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*/
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void
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TALER_wallet_reserve_attest_request_sign (
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@ -3212,7 +3218,14 @@ TALER_wallet_reserve_attest_request_sign (
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/**
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* FIXME.
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* Verify request to the exchange to confirm certain
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* @a details about the owner of a reserve.
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*
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* @param request_timestamp when was the request created
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* @param details which attributes are requested
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* @param reserve_priv private key of the reserve
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* @param reserve_sig where to store the signature
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* @return #GNUNET_OK if the signature is valid
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*/
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enum GNUNET_GenericReturnValue
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TALER_wallet_reserve_attest_request_verify (
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@ -4250,6 +4263,53 @@ TALER_exchange_online_reserve_closed_verify (
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const struct TALER_ExchangeSignatureP *sig);
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/**
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* Create signature by exchange affirming that a reserve
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* has had certain attributes verified via KYC.
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*
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* @param scb function to call to create the signature
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* @param attest_timestamp our time
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* @param expiration_time when does the KYC data expire
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* @param reserve_pub for which reserve are attributes attested
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* @param attributes JSON object with attributes being attested to
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* @param[out] pub where to write the public key
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* @param[out] sig where to write the signature
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* @return #TALER_EC_NONE on success
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*/
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enum TALER_ErrorCode
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TALER_exchange_online_reserve_attest_details_sign (
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TALER_ExchangeSignCallback scb,
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struct GNUNET_TIME_Timestamp attest_timestamp,
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struct GNUNET_TIME_Timestamp expiration_time,
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const struct TALER_ReservePublicKeyP *reserve_pub,
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const json_t *attributes,
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struct TALER_ExchangePublicKeyP *pub,
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struct TALER_ExchangeSignatureP *sig);
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/**
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* Verify signature by exchange affirming that a reserve
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* has had certain attributes verified via KYC.
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*
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* @param scb function to call to create the signature
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* @param attest_timestamp our time
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* @param expiration_time when does the KYC data expire
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* @param reserve_pub for which reserve are attributes attested
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* @param attributes JSON object with attributes being attested to
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* @param pub exchange public key
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* @param sig exchange signature to verify
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* @return #GNUNET_OK if the signature is valid
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*/
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enum GNUNET_GenericReturnValue
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TALER_exchange_online_reserve_attest_details_verify (
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struct GNUNET_TIME_Timestamp attest_timestamp,
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struct GNUNET_TIME_Timestamp expiration_time,
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const struct TALER_ReservePublicKeyP *reserve_pub,
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const json_t *attributes,
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struct TALER_ExchangePublicKeyP *pub,
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struct TALER_ExchangeSignatureP *sig);
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/**
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* Create signature by exchange affirming that a purse was created.
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*
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@ -5451,6 +5451,30 @@ struct TALER_EXCHANGE_ReservePostAttestResult
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*/
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struct
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{
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/**
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* Time when the exchange made the signature.
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*/
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struct GNUNET_TIME_Timestamp exchange_time;
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/**
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* Current expiration time of the reserve.
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*/
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struct GNUNET_TIME_Timestamp expiration_time;
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/**
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* Signature by the exchange affirming the attributes.
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*/
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struct TALER_ExchangeSignatureP exchange_sig;
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/**
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* Online signing key used by the exchange.
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*/
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struct TALER_ExchangePublicKeyP exchange_pub;
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/**
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* Attributes being confirmed by the exchange.
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*/
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const json_t *attributes;
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} ok;
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@ -60,6 +60,7 @@ libtalerexchange_la_SOURCES = \
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exchange_api_refresh_common.c exchange_api_refresh_common.h \
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exchange_api_refreshes_reveal.c \
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exchange_api_refund.c \
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exchange_api_reserves_attest.c \
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exchange_api_reserves_close.c \
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exchange_api_reserves_get.c \
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exchange_api_reserves_get_attestable.c \
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358
src/lib/exchange_api_reserves_attest.c
Normal file
358
src/lib/exchange_api_reserves_attest.c
Normal file
@ -0,0 +1,358 @@
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/*
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This file is part of TALER
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Copyright (C) 2014-2022 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 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 General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file lib/exchange_api_reserves_attest.c
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* @brief Implementation of the POST /reserves/$RESERVE_PUB/attest requests
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <jansson.h>
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#include <microhttpd.h> /* just for HTTP attest codes */
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_json_lib.h>
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#include <gnunet/gnunet_curl_lib.h>
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#include "taler_exchange_service.h"
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#include "taler_json_lib.h"
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#include "exchange_api_handle.h"
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#include "taler_signatures.h"
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#include "exchange_api_curl_defaults.h"
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/**
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* @brief A /reserves/$RID/attest Handle
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*/
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struct TALER_EXCHANGE_ReservesAttestHandle
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{
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/**
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* The connection to exchange this request handle will use
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*/
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struct TALER_EXCHANGE_Handle *exchange;
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/**
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* The url for this request.
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*/
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char *url;
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/**
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* Handle for the request.
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*/
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struct GNUNET_CURL_Job *job;
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/**
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* Context for #TEH_curl_easy_post(). Keeps the data that must
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* persist for Curl to make the upload.
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*/
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struct TALER_CURL_PostContext post_ctx;
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/**
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* Function to call with the result.
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*/
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TALER_EXCHANGE_ReservesPostAttestCallback cb;
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/**
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* Public key of the reserve we are querying.
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*/
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struct TALER_ReservePublicKeyP reserve_pub;
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/**
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* Closure for @a cb.
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*/
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void *cb_cls;
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};
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/**
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* We received an #MHD_HTTP_OK attest code. Handle the JSON
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* response.
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*
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* @param rsh handle of the request
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* @param j JSON response
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* @return #GNUNET_OK on success
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*/
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static enum GNUNET_GenericReturnValue
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handle_reserves_attest_ok (struct TALER_EXCHANGE_ReservesAttestHandle *rsh,
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const json_t *j)
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{
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struct TALER_EXCHANGE_ReservePostAttestResult rs = {
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.hr.reply = j,
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.hr.http_status = MHD_HTTP_OK
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};
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json_t *attributes;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_timestamp ("exchange_timestamp",
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&rs.details.ok.exchange_time),
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GNUNET_JSON_spec_timestamp ("exchange_timestamp",
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&rs.details.ok.expiration_time),
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GNUNET_JSON_spec_fixed_auto ("exchange_sig",
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&rs.details.ok.exchange_sig),
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GNUNET_JSON_spec_fixed_auto ("exchange_pub",
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&rs.details.ok.exchange_pub),
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GNUNET_JSON_spec_json ("attributes",
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&attributes),
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GNUNET_JSON_spec_end ()
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};
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if (GNUNET_OK !=
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GNUNET_JSON_parse (j,
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spec,
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NULL,
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NULL))
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{
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GNUNET_break_op (0);
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return GNUNET_SYSERR;
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}
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rs.details.ok.attributes = attributes;
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if (GNUNET_OK !=
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TALER_exchange_online_reserve_attest_details_verify (
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rs.details.ok.exchange_time,
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rs.details.ok.expiration_time,
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&rsh->reserve_pub,
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attributes,
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&rs.details.ok.exchange_pub,
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&rs.details.ok.exchange_sig))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return GNUNET_SYSERR;
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}
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// FIXME: verify exchange signature!
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// => needs crypto API first!
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rsh->cb (rsh->cb_cls,
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&rs);
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rsh->cb = NULL;
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GNUNET_JSON_parse_free (spec);
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return GNUNET_OK;
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}
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/**
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* Function called when we're done processing the
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* HTTP /reserves/$RID/attest request.
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*
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* @param cls the `struct TALER_EXCHANGE_ReservesAttestHandle`
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* @param response_code HTTP response code, 0 on error
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* @param response parsed JSON result, NULL on error
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*/
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static void
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handle_reserves_attest_finished (void *cls,
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long response_code,
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const void *response)
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{
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struct TALER_EXCHANGE_ReservesAttestHandle *rsh = cls;
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const json_t *j = response;
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struct TALER_EXCHANGE_ReservePostAttestResult rs = {
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.hr.reply = j,
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.hr.http_status = (unsigned int) response_code
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};
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rsh->job = NULL;
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switch (response_code)
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{
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case 0:
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rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
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break;
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case MHD_HTTP_OK:
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if (GNUNET_OK !=
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handle_reserves_attest_ok (rsh,
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j))
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{
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rs.hr.http_status = 0;
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rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
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}
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break;
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case MHD_HTTP_BAD_REQUEST:
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/* This should never happen, either us or the exchange is buggy
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(or API version conflict); just pass JSON reply to the application */
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GNUNET_break (0);
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_FORBIDDEN:
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/* This should never happen, either us or the exchange is buggy
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(or API version conflict); just pass JSON reply to the application */
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GNUNET_break (0);
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_NOT_FOUND:
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/* Nothing really to verify, this should never
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happen, we should pass the JSON reply to the application */
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_CONFLICT:
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/* Server doesn't have the requested attributes */
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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break;
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case MHD_HTTP_INTERNAL_SERVER_ERROR:
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/* Server had an internal issue; we should retry, but this API
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leaves this to the application */
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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break;
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default:
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/* unexpected response code */
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GNUNET_break_op (0);
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rs.hr.ec = TALER_JSON_get_error_code (j);
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rs.hr.hint = TALER_JSON_get_error_hint (j);
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Unexpected response code %u/%d for reserves attest\n",
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(unsigned int) response_code,
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(int) rs.hr.ec);
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break;
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}
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if (NULL != rsh->cb)
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{
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rsh->cb (rsh->cb_cls,
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&rs);
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rsh->cb = NULL;
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}
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TALER_EXCHANGE_reserves_attest_cancel (rsh);
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}
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struct TALER_EXCHANGE_ReservesAttestHandle *
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TALER_EXCHANGE_reserves_attest (
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struct TALER_EXCHANGE_Handle *exchange,
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const struct TALER_ReservePrivateKeyP *reserve_priv,
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unsigned int attributes_length,
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const char *const*attributes,
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TALER_EXCHANGE_ReservesPostAttestCallback cb,
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void *cb_cls)
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{
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struct TALER_EXCHANGE_ReservesAttestHandle *rsh;
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struct GNUNET_CURL_Context *ctx;
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CURL *eh;
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char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
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struct TALER_ReserveSignatureP reserve_sig;
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json_t *details;
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struct GNUNET_TIME_Timestamp ts;
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if (0 == attributes_length)
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{
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GNUNET_break (0);
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return NULL;
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}
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if (GNUNET_YES !=
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TEAH_handle_is_ready (exchange))
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{
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GNUNET_break (0);
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return NULL;
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}
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details = json_array ();
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GNUNET_assert (NULL != details);
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for (unsigned int i = 0; i<attributes_length; i++)
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{
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GNUNET_assert (0 ==
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json_array_append_new (details,
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json_string (attributes[i])));
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}
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rsh = GNUNET_new (struct TALER_EXCHANGE_ReservesAttestHandle);
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rsh->exchange = exchange;
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rsh->cb = cb;
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rsh->cb_cls = cb_cls;
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GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
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&rsh->reserve_pub.eddsa_pub);
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{
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char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
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char *end;
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end = GNUNET_STRINGS_data_to_string (
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&rsh->reserve_pub,
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sizeof (rsh->reserve_pub),
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pub_str,
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sizeof (pub_str));
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*end = '\0';
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GNUNET_snprintf (arg_str,
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sizeof (arg_str),
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"/reserves/%s/attest",
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pub_str);
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}
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rsh->url = TEAH_path_to_url (exchange,
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arg_str);
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if (NULL == rsh->url)
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{
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json_decref (details);
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GNUNET_free (rsh);
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return NULL;
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}
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eh = TALER_EXCHANGE_curl_easy_get_ (rsh->url);
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if (NULL == eh)
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{
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GNUNET_break (0);
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json_decref (details);
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GNUNET_free (rsh->url);
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GNUNET_free (rsh);
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return NULL;
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}
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ts = GNUNET_TIME_timestamp_get ();
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TALER_wallet_reserve_attest_request_sign (ts,
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details,
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reserve_priv,
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&reserve_sig);
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{
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json_t *attest_obj = GNUNET_JSON_PACK (
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GNUNET_JSON_pack_data_auto ("reserve_sig",
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&reserve_sig),
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GNUNET_JSON_pack_timestamp ("request_timestamp",
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ts),
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GNUNET_JSON_pack_object_steal ("details",
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details));
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if (GNUNET_OK !=
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TALER_curl_easy_post (&rsh->post_ctx,
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eh,
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attest_obj))
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{
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GNUNET_break (0);
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curl_easy_cleanup (eh);
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json_decref (attest_obj);
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GNUNET_free (rsh->url);
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GNUNET_free (rsh);
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return NULL;
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}
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json_decref (attest_obj);
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}
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ctx = TEAH_handle_to_context (exchange);
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rsh->job = GNUNET_CURL_job_add2 (ctx,
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eh,
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rsh->post_ctx.headers,
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&handle_reserves_attest_finished,
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rsh);
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return rsh;
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}
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void
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TALER_EXCHANGE_reserves_attest_cancel (
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struct TALER_EXCHANGE_ReservesAttestHandle *rsh)
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{
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if (NULL != rsh->job)
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{
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GNUNET_CURL_job_cancel (rsh->job);
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rsh->job = NULL;
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}
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TALER_curl_easy_post_finished (&rsh->post_ctx);
|
||||
GNUNET_free (rsh->url);
|
||||
GNUNET_free (rsh);
|
||||
}
|
||||
|
||||
|
||||
/* end of exchange_api_reserves_attest.c */
|
||||
Loading…
Reference in New Issue
Block a user