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authorChristian Grothoff <christian@grothoff.org>2022-09-27 16:10:00 +0200
committerChristian Grothoff <christian@grothoff.org>2022-09-27 16:10:00 +0200
commit2635f2e0b8246a08e3456ced3068fe161b07a87b (patch)
treecd99a0e65554d45de27cf5b12ab912ca032c54f1
parent33680940fe7df8261880fa1d7f164c8b02a33aed (diff)
downloadexchange-master.tar.gz
exchange-master.tar.bz2
exchange-master.zip
implement exchange_api_reserves_attest.cHEADmaster
-rw-r--r--src/include/taler_crypto_lib.h64
-rw-r--r--src/include/taler_exchange_service.h24
-rw-r--r--src/lib/Makefile.am1
-rw-r--r--src/lib/exchange_api_reserves_attest.c358
4 files changed, 445 insertions, 2 deletions
diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 4ad9eed0..b5ae2083 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -3201,7 +3201,13 @@ TALER_wallet_account_setup_verify (
/**
- * FIXME.
+ * Sign request to the exchange to confirm certain
+ * @a details about the owner of a reserve.
+ *
+ * @param request_timestamp when was the request created
+ * @param details which attributes are requested
+ * @param reserve_priv private key of the reserve
+ * @param[out] reserve_sig where to store the signature
*/
void
TALER_wallet_reserve_attest_request_sign (
@@ -3212,7 +3218,14 @@ TALER_wallet_reserve_attest_request_sign (
/**
- * FIXME.
+ * Verify request to the exchange to confirm certain
+ * @a details about the owner of a reserve.
+ *
+ * @param request_timestamp when was the request created
+ * @param details which attributes are requested
+ * @param reserve_priv private key of the reserve
+ * @param reserve_sig where to store the signature
+ * @return #GNUNET_OK if the signature is valid
*/
enum GNUNET_GenericReturnValue
TALER_wallet_reserve_attest_request_verify (
@@ -4251,6 +4264,53 @@ TALER_exchange_online_reserve_closed_verify (
/**
+ * Create signature by exchange affirming that a reserve
+ * has had certain attributes verified via KYC.
+ *
+ * @param scb function to call to create the signature
+ * @param attest_timestamp our time
+ * @param expiration_time when does the KYC data expire
+ * @param reserve_pub for which reserve are attributes attested
+ * @param attributes JSON object with attributes being attested to
+ * @param[out] pub where to write the public key
+ * @param[out] sig where to write the signature
+ * @return #TALER_EC_NONE on success
+ */
+enum TALER_ErrorCode
+TALER_exchange_online_reserve_attest_details_sign (
+ TALER_ExchangeSignCallback scb,
+ struct GNUNET_TIME_Timestamp attest_timestamp,
+ struct GNUNET_TIME_Timestamp expiration_time,
+ const struct TALER_ReservePublicKeyP *reserve_pub,
+ const json_t *attributes,
+ struct TALER_ExchangePublicKeyP *pub,
+ struct TALER_ExchangeSignatureP *sig);
+
+
+/**
+ * Verify signature by exchange affirming that a reserve
+ * has had certain attributes verified via KYC.
+ *
+ * @param scb function to call to create the signature
+ * @param attest_timestamp our time
+ * @param expiration_time when does the KYC data expire
+ * @param reserve_pub for which reserve are attributes attested
+ * @param attributes JSON object with attributes being attested to
+ * @param pub exchange public key
+ * @param sig exchange signature to verify
+ * @return #GNUNET_OK if the signature is valid
+ */
+enum GNUNET_GenericReturnValue
+TALER_exchange_online_reserve_attest_details_verify (
+ struct GNUNET_TIME_Timestamp attest_timestamp,
+ struct GNUNET_TIME_Timestamp expiration_time,
+ const struct TALER_ReservePublicKeyP *reserve_pub,
+ const json_t *attributes,
+ struct TALER_ExchangePublicKeyP *pub,
+ struct TALER_ExchangeSignatureP *sig);
+
+
+/**
* Create signature by exchange affirming that a purse was created.
*
* @param scb function to call to create the signature
diff --git a/src/include/taler_exchange_service.h b/src/include/taler_exchange_service.h
index 7949dbbf..2abd6b2a 100644
--- a/src/include/taler_exchange_service.h
+++ b/src/include/taler_exchange_service.h
@@ -5451,6 +5451,30 @@ struct TALER_EXCHANGE_ReservePostAttestResult
*/
struct
{
+ /**
+ * Time when the exchange made the signature.
+ */
+ struct GNUNET_TIME_Timestamp exchange_time;
+
+ /**
+ * Current expiration time of the reserve.
+ */
+ struct GNUNET_TIME_Timestamp expiration_time;
+
+ /**
+ * Signature by the exchange affirming the attributes.
+ */
+ struct TALER_ExchangeSignatureP exchange_sig;
+
+ /**
+ * Online signing key used by the exchange.
+ */
+ struct TALER_ExchangePublicKeyP exchange_pub;
+
+ /**
+ * Attributes being confirmed by the exchange.
+ */
+ const json_t *attributes;
} ok;
diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index df02dc09..e695cf04 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -60,6 +60,7 @@ libtalerexchange_la_SOURCES = \
exchange_api_refresh_common.c exchange_api_refresh_common.h \
exchange_api_refreshes_reveal.c \
exchange_api_refund.c \
+ exchange_api_reserves_attest.c \
exchange_api_reserves_close.c \
exchange_api_reserves_get.c \
exchange_api_reserves_get_attestable.c \
diff --git a/src/lib/exchange_api_reserves_attest.c b/src/lib/exchange_api_reserves_attest.c
new file mode 100644
index 00000000..5ccc18e5
--- /dev/null
+++ b/src/lib/exchange_api_reserves_attest.c
@@ -0,0 +1,358 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014-2022 Taler Systems SA
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING. If not, see
+ <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file lib/exchange_api_reserves_attest.c
+ * @brief Implementation of the POST /reserves/$RESERVE_PUB/attest requests
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <jansson.h>
+#include <microhttpd.h> /* just for HTTP attest codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_json_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_exchange_service.h"
+#include "taler_json_lib.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * @brief A /reserves/$RID/attest Handle
+ */
+struct TALER_EXCHANGE_ReservesAttestHandle
+{
+
+ /**
+ * The connection to exchange this request handle will use
+ */
+ struct TALER_EXCHANGE_Handle *exchange;
+
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Context for #TEH_curl_easy_post(). Keeps the data that must
+ * persist for Curl to make the upload.
+ */
+ struct TALER_CURL_PostContext post_ctx;
+
+ /**
+ * Function to call with the result.
+ */
+ TALER_EXCHANGE_ReservesPostAttestCallback cb;
+
+ /**
+ * Public key of the reserve we are querying.
+ */
+ struct TALER_ReservePublicKeyP reserve_pub;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * We received an #MHD_HTTP_OK attest code. Handle the JSON
+ * response.
+ *
+ * @param rsh handle of the request
+ * @param j JSON response
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+handle_reserves_attest_ok (struct TALER_EXCHANGE_ReservesAttestHandle *rsh,
+ const json_t *j)
+{
+ struct TALER_EXCHANGE_ReservePostAttestResult rs = {
+ .hr.reply = j,
+ .hr.http_status = MHD_HTTP_OK
+ };
+ json_t *attributes;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_timestamp ("exchange_timestamp",
+ &rs.details.ok.exchange_time),
+ GNUNET_JSON_spec_timestamp ("exchange_timestamp",
+ &rs.details.ok.expiration_time),
+ GNUNET_JSON_spec_fixed_auto ("exchange_sig",
+ &rs.details.ok.exchange_sig),
+ GNUNET_JSON_spec_fixed_auto ("exchange_pub",
+ &rs.details.ok.exchange_pub),
+ GNUNET_JSON_spec_json ("attributes",
+ &attributes),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (j,
+ spec,
+ NULL,
+ NULL))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ rs.details.ok.attributes = attributes;
+ if (GNUNET_OK !=
+ TALER_exchange_online_reserve_attest_details_verify (
+ rs.details.ok.exchange_time,
+ rs.details.ok.expiration_time,
+ &rsh->reserve_pub,
+ attributes,
+ &rs.details.ok.exchange_pub,
+ &rs.details.ok.exchange_sig))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_SYSERR;
+ }
+ // FIXME: verify exchange signature!
+ // => needs crypto API first!
+ rsh->cb (rsh->cb_cls,
+ &rs);
+ rsh->cb = NULL;
+ GNUNET_JSON_parse_free (spec);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /reserves/$RID/attest request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_ReservesAttestHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_reserves_attest_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct TALER_EXCHANGE_ReservesAttestHandle *rsh = cls;
+ const json_t *j = response;
+ struct TALER_EXCHANGE_ReservePostAttestResult rs = {
+ .hr.reply = j,
+ .hr.http_status = (unsigned int) response_code
+ };
+
+ rsh->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ rs.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+ break;
+ case MHD_HTTP_OK:
+ if (GNUNET_OK !=
+ handle_reserves_attest_ok (rsh,
+ j))
+ {
+ rs.hr.http_status = 0;
+ rs.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+ }
+ break;
+ case MHD_HTTP_BAD_REQUEST:
+ /* This should never happen, either us or the exchange is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ GNUNET_break (0);
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_FORBIDDEN:
+ /* This should never happen, either us or the exchange is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ GNUNET_break (0);
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_NOT_FOUND:
+ /* Nothing really to verify, this should never
+ happen, we should pass the JSON reply to the application */
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_CONFLICT:
+ /* Server doesn't have the requested attributes */
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ case MHD_HTTP_INTERNAL_SERVER_ERROR:
+ /* Server had an internal issue; we should retry, but this API
+ leaves this to the application */
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ break;
+ default:
+ /* unexpected response code */
+ GNUNET_break_op (0);
+ rs.hr.ec = TALER_JSON_get_error_code (j);
+ rs.hr.hint = TALER_JSON_get_error_hint (j);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Unexpected response code %u/%d for reserves attest\n",
+ (unsigned int) response_code,
+ (int) rs.hr.ec);
+ break;
+ }
+ if (NULL != rsh->cb)
+ {
+ rsh->cb (rsh->cb_cls,
+ &rs);
+ rsh->cb = NULL;
+ }
+ TALER_EXCHANGE_reserves_attest_cancel (rsh);
+}
+
+
+struct TALER_EXCHANGE_ReservesAttestHandle *
+TALER_EXCHANGE_reserves_attest (
+ struct TALER_EXCHANGE_Handle *exchange,
+ const struct TALER_ReservePrivateKeyP *reserve_priv,
+ unsigned int attributes_length,
+ const char *const*attributes,
+ TALER_EXCHANGE_ReservesPostAttestCallback cb,
+ void *cb_cls)
+{
+ struct TALER_EXCHANGE_ReservesAttestHandle *rsh;
+ struct GNUNET_CURL_Context *ctx;
+ CURL *eh;
+ char arg_str[sizeof (struct TALER_ReservePublicKeyP) * 2 + 32];
+ struct TALER_ReserveSignatureP reserve_sig;
+ json_t *details;
+ struct GNUNET_TIME_Timestamp ts;
+
+ if (0 == attributes_length)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ if (GNUNET_YES !=
+ TEAH_handle_is_ready (exchange))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ details = json_array ();
+ GNUNET_assert (NULL != details);
+ for (unsigned int i = 0; i<attributes_length; i++)
+ {
+ GNUNET_assert (0 ==
+ json_array_append_new (details,
+ json_string (attributes[i])));
+ }
+ rsh = GNUNET_new (struct TALER_EXCHANGE_ReservesAttestHandle);
+ rsh->exchange = exchange;
+ rsh->cb = cb;
+ rsh->cb_cls = cb_cls;
+ GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
+ &rsh->reserve_pub.eddsa_pub);
+ {
+ char pub_str[sizeof (struct TALER_ReservePublicKeyP) * 2];
+ char *end;
+
+ end = GNUNET_STRINGS_data_to_string (
+ &rsh->reserve_pub,
+ sizeof (rsh->reserve_pub),
+ pub_str,
+ sizeof (pub_str));
+ *end = '\0';
+ GNUNET_snprintf (arg_str,
+ sizeof (arg_str),
+ "/reserves/%s/attest",
+ pub_str);
+ }
+ rsh->url = TEAH_path_to_url (exchange,
+ arg_str);
+ if (NULL == rsh->url)
+ {
+ json_decref (details);
+ GNUNET_free (rsh);
+ return NULL;
+ }
+ eh = TALER_EXCHANGE_curl_easy_get_ (rsh->url);
+ if (NULL == eh)
+ {
+ GNUNET_break (0);
+ json_decref (details);
+ GNUNET_free (rsh->url);
+ GNUNET_free (rsh);
+ return NULL;
+ }
+ ts = GNUNET_TIME_timestamp_get ();
+ TALER_wallet_reserve_attest_request_sign (ts,
+ details,
+ reserve_priv,
+ &reserve_sig);
+ {
+ json_t *attest_obj = GNUNET_JSON_PACK (
+ GNUNET_JSON_pack_data_auto ("reserve_sig",
+ &reserve_sig),
+ GNUNET_JSON_pack_timestamp ("request_timestamp",
+ ts),
+ GNUNET_JSON_pack_object_steal ("details",
+ details));
+
+ if (GNUNET_OK !=
+ TALER_curl_easy_post (&rsh->post_ctx,
+ eh,
+ attest_obj))
+ {
+ GNUNET_break (0);
+ curl_easy_cleanup (eh);
+ json_decref (attest_obj);
+ GNUNET_free (rsh->url);
+ GNUNET_free (rsh);
+ return NULL;
+ }
+ json_decref (attest_obj);
+ }
+ ctx = TEAH_handle_to_context (exchange);
+ rsh->job = GNUNET_CURL_job_add2 (ctx,
+ eh,
+ rsh->post_ctx.headers,
+ &handle_reserves_attest_finished,
+ rsh);
+ return rsh;
+}
+
+
+void
+TALER_EXCHANGE_reserves_attest_cancel (
+ struct TALER_EXCHANGE_ReservesAttestHandle *rsh)
+{
+ if (NULL != rsh->job)
+ {
+ GNUNET_CURL_job_cancel (rsh->job);
+ rsh->job = NULL;
+ }
+ TALER_curl_easy_post_finished (&rsh->post_ctx);
+ GNUNET_free (rsh->url);
+ GNUNET_free (rsh);
+}
+
+
+/* end of exchange_api_reserves_attest.c */