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authorChristian Grothoff <christian@grothoff.org>2016-03-01 15:35:04 +0100
committerChristian Grothoff <christian@grothoff.org>2016-03-01 15:35:04 +0100
commitb5cba3251053c22bf1df46282f1dd0a4c46f6a38 (patch)
treeb7495c3e47c40c57ff81045a4e43aa07a3b6c7b1 /src/mint-lib/mint_api_deposit.c
parente406833eab7ca0835f9779abebada94592a85a7e (diff)
renaming mint->exchange
Diffstat (limited to 'src/mint-lib/mint_api_deposit.c')
-rw-r--r--src/mint-lib/mint_api_deposit.c569
1 files changed, 0 insertions, 569 deletions
diff --git a/src/mint-lib/mint_api_deposit.c b/src/mint-lib/mint_api_deposit.c
deleted file mode 100644
index 400372925..000000000
--- a/src/mint-lib/mint_api_deposit.c
+++ /dev/null
@@ -1,569 +0,0 @@
-/*
- This file is part of TALER
- Copyright (C) 2014, 2015 GNUnet e.V.
-
- 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, If not, see
- <http://www.gnu.org/licenses/>
-*/
-/**
- * @file mint-lib/mint_api_deposit.c
- * @brief Implementation of the /deposit request of the mint's HTTP API
- * @author Sree Harsha Totakura <sreeharsha@totakura.in>
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include <curl/curl.h>
-#include <jansson.h>
-#include <microhttpd.h> /* just for HTTP status codes */
-#include <gnunet/gnunet_util_lib.h>
-#include "taler_mint_service.h"
-#include "mint_api_common.h"
-#include "mint_api_json.h"
-#include "mint_api_context.h"
-#include "mint_api_handle.h"
-#include "taler_signatures.h"
-
-
-/**
- * @brief A Deposit Handle
- */
-struct TALER_MINT_DepositHandle
-{
-
- /**
- * The connection to mint this request handle will use
- */
- struct TALER_MINT_Handle *mint;
-
- /**
- * The url for this request.
- */
- char *url;
-
- /**
- * JSON encoding of the request to POST.
- */
- char *json_enc;
-
- /**
- * Handle for the request.
- */
- struct MAC_Job *job;
-
- /**
- * Function to call with the result.
- */
- TALER_MINT_DepositResultCallback cb;
-
- /**
- * Closure for @a cb.
- */
- void *cb_cls;
-
- /**
- * Download buffer
- */
- struct MAC_DownloadBuffer db;
-
- /**
- * Information the mint should sign in response.
- */
- struct TALER_DepositConfirmationPS depconf;
-
- /**
- * Value of the /deposit transaction, including fee.
- */
- struct TALER_Amount amount_with_fee;
-
- /**
- * Total value of the coin being transacted with.
- */
- struct TALER_Amount coin_value;
-
-};
-
-
-/**
- * Verify that the signature on the "200 OK" response
- * from the mint is valid.
- *
- * @param dh deposit handle
- * @param json json reply with the signature
- * @return #GNUNET_OK if the signature is valid, #GNUNET_SYSERR if not
- */
-static int
-verify_deposit_signature_ok (const struct TALER_MINT_DepositHandle *dh,
- json_t *json)
-{
- struct TALER_MintSignatureP mint_sig;
- struct TALER_MintPublicKeyP mint_pub;
- const struct TALER_MINT_Keys *key_state;
- struct MAJ_Specification spec[] = {
- MAJ_spec_fixed_auto ("sig", &mint_sig),
- MAJ_spec_fixed_auto ("pub", &mint_pub),
- MAJ_spec_end
- };
-
- if (GNUNET_OK !=
- MAJ_parse_json (json,
- spec))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- key_state = TALER_MINT_get_keys (dh->mint);
- if (GNUNET_OK !=
- TALER_MINT_test_signing_key (key_state,
- &mint_pub))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MINT_CONFIRM_DEPOSIT,
- &dh->depconf.purpose,
- &mint_sig.eddsa_signature,
- &mint_pub.eddsa_pub))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Verify that the signatures on the "403 FORBIDDEN" response from the
- * mint demonstrating customer double-spending are valid.
- *
- * @param dh deposit handle
- * @param json json reply with the signature(s) and transaction history
- * @return #GNUNET_OK if the signature(s) is valid, #GNUNET_SYSERR if not
- */
-static int
-verify_deposit_signature_forbidden (const struct TALER_MINT_DepositHandle *dh,
- json_t *json)
-{
- json_t *history;
- struct TALER_Amount total;
-
- history = json_object_get (json,
- "history");
- if (GNUNET_OK !=
- TALER_MINT_verify_coin_history_ (dh->coin_value.currency,
- &dh->depconf.coin_pub,
- history,
- &total))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- TALER_amount_add (&total,
- &total,
- &dh->amount_with_fee))
- {
- /* clearly not OK if our transaction would have caused
- the overflow... */
- return GNUNET_OK;
- }
-
- if (0 >= TALER_amount_cmp (&total,
- &dh->coin_value))
- {
- /* transaction should have still fit */
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- /* everything OK, proof of double-spending was provided */
- return GNUNET_OK;
-}
-
-
-/**
- * Function called when we're done processing the
- * HTTP /deposit request.
- *
- * @param cls the `struct TALER_MINT_DepositHandle`
- * @param eh the curl request handle
- */
-static void
-handle_deposit_finished (void *cls,
- CURL *eh)
-{
- struct TALER_MINT_DepositHandle *dh = cls;
- long response_code;
- json_t *json;
-
- dh->job = NULL;
- json = MAC_download_get_result (&dh->db,
- eh,
- &response_code);
- switch (response_code)
- {
- case 0:
- break;
- case MHD_HTTP_OK:
- if (GNUNET_OK !=
- verify_deposit_signature_ok (dh,
- json))
- {
- GNUNET_break_op (0);
- response_code = 0;
- }
- break;
- case MHD_HTTP_BAD_REQUEST:
- /* This should never happen, either us or the mint is buggy
- (or API version conflict); just pass JSON reply to the application */
- break;
- case MHD_HTTP_FORBIDDEN:
- /* Double spending; check signatures on transaction history */
- if (GNUNET_OK !=
- verify_deposit_signature_forbidden (dh,
- json))
- {
- GNUNET_break_op (0);
- response_code = 0;
- }
- break;
- case MHD_HTTP_UNAUTHORIZED:
- /* Nothing really to verify, mint says one of the signatures is
- invalid; as we checked them, this should never happen, we
- should pass the JSON reply to the application */
- break;
- case MHD_HTTP_NOT_FOUND:
- /* Nothing really to verify, this should never
- happen, we should pass the JSON reply to the application */
- break;
- case MHD_HTTP_INTERNAL_SERVER_ERROR:
- /* Server had an internal issue; we should retry, but this API
- leaves this to the application */
- break;
- default:
- /* unexpected response code */
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Unexpected response code %u\n",
- response_code);
- GNUNET_break (0);
- response_code = 0;
- break;
- }
- dh->cb (dh->cb_cls,
- response_code,
- json);
- json_decref (json);
- TALER_MINT_deposit_cancel (dh);
-}
-
-
-/**
- * Verify signature information about the deposit.
- *
- * @param dki public key information
- * @param amount the amount to be deposited
- * @param h_wire hash of the merchant’s account details
- * @param h_contract hash of the contact of the merchant with the customer (further details are never disclosed to the mint)
- * @param coin_pub coin’s public key
- * @param denom_pub denomination key with which the coin is signed
- * @param denom_sig mint’s unblinded signature of the coin
- * @param timestamp timestamp when the contract was finalized, must match approximately the current time of the mint
- * @param transaction_id transaction id for the transaction between merchant and customer
- * @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
- * @param refund_deadline date until which the merchant can issue a refund to the customer via the mint (can be zero if refunds are not allowed)
- * @param coin_sig the signature made with purpose #TALER_SIGNATURE_WALLET_COIN_DEPOSIT made by the customer with the coin’s private key.
- * @return #GNUNET_OK if signatures are OK, #GNUNET_SYSERR if not
- */
-static int
-verify_signatures (const struct TALER_MINT_DenomPublicKey *dki,
- const struct TALER_Amount *amount,
- const struct GNUNET_HashCode *h_wire,
- const struct GNUNET_HashCode *h_contract,
- const struct TALER_CoinSpendPublicKeyP *coin_pub,
- const struct TALER_DenominationSignature *denom_sig,
- const struct TALER_DenominationPublicKey *denom_pub,
- struct GNUNET_TIME_Absolute timestamp,
- uint64_t transaction_id,
- const struct TALER_MerchantPublicKeyP *merchant_pub,
- struct GNUNET_TIME_Absolute refund_deadline,
- const struct TALER_CoinSpendSignatureP *coin_sig)
-{
- struct TALER_DepositRequestPS dr;
- struct TALER_CoinPublicInfo coin_info;
-
- dr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_DEPOSIT);
- dr.purpose.size = htonl (sizeof (struct TALER_DepositRequestPS));
- dr.h_contract = *h_contract;
- dr.h_wire = *h_wire;
- dr.timestamp = GNUNET_TIME_absolute_hton (timestamp);
- dr.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline);
- dr.transaction_id = GNUNET_htonll (transaction_id);
- TALER_amount_hton (&dr.amount_with_fee,
- amount);
- TALER_amount_hton (&dr.deposit_fee,
- &dki->fee_deposit);
- dr.merchant = *merchant_pub;
- dr.coin_pub = *coin_pub;
- if (GNUNET_OK !=
- GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_DEPOSIT,
- &dr.purpose,
- &coin_sig->eddsa_signature,
- &coin_pub->eddsa_pub))
- {
- TALER_LOG_WARNING ("Invalid coin signature on /deposit request\n");
- {
- char *s;
- s = TALER_amount_to_string (amount);
- TALER_LOG_DEBUG ("... amount_with_fee was %s\n", s);
- GNUNET_free (s);
- s = TALER_amount_to_string (&dki->fee_deposit);
- TALER_LOG_DEBUG ("... deposit_fee was %s\n", s);
- GNUNET_free (s);
- }
-
- return GNUNET_SYSERR;
- }
-
- /* check coin signature */
- coin_info.coin_pub = *coin_pub;
- coin_info.denom_pub = *denom_pub;
- coin_info.denom_sig = *denom_sig;
- if (GNUNET_YES !=
- TALER_test_coin_valid (&coin_info))
- {
- TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
- return GNUNET_SYSERR;
- }
- if (0 < TALER_amount_cmp (&dki->fee_deposit,
- amount))
- {
- TALER_LOG_WARNING ("Deposit amount smaller than fee\n");
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * Submit a deposit permission to the mint and get the mint's response.
- * Note that while we return the response verbatim to the caller for
- * further processing, we do already verify that the response is
- * well-formed (i.e. that signatures included in the response are all
- * valid). If the mint's reply is not well-formed, we return an
- * HTTP status code of zero to @a cb.
- *
- * We also verify that the @a coin_sig is valid for this deposit
- * request, and that the @a ub_sig is a valid signature for @a
- * coin_pub. Also, the @a mint must be ready to operate (i.e. have
- * finished processing the /keys reply). If either check fails, we do
- * NOT initiate the transaction with the mint and instead return NULL.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param amount the amount to be deposited
- * @param wire_deadline date until which the merchant would like the mint to settle the balance (advisory, the mint cannot be
- * forced to settle in the past or upon very short notice, but of course a well-behaved mint will limit aggregation based on the advice received)
- * @param wire_details the merchant’s account details, in a format supported by the mint
- * @param h_contract hash of the contact of the merchant with the customer (further details are never disclosed to the mint)
- * @param coin_pub coin’s public key
- * @param denom_pub denomination key with which the coin is signed
- * @param denom_sig mint’s unblinded signature of the coin
- * @param timestamp timestamp when the contract was finalized, must match approximately the current time of the mint
- * @param transaction_id transaction id for the transaction between merchant and customer
- * @param merchant_pub the public key of the merchant (used to identify the merchant for refund requests)
- * @param refund_deadline date until which the merchant can issue a refund to the customer via the mint (can be zero if refunds are not allowed)
- * @param coin_sig the signature made with purpose #TALER_SIGNATURE_WALLET_COIN_DEPOSIT made by the customer with the coin’s private key.
- * @param cb the callback to call when a reply for this request is available
- * @param cb_cls closure for the above callback
- * @return a handle for this request; NULL if the inputs are invalid (i.e.
- * signatures fail to verify). In this case, the callback is not called.
- */
-struct TALER_MINT_DepositHandle *
-TALER_MINT_deposit (struct TALER_MINT_Handle *mint,
- const struct TALER_Amount *amount,
- struct GNUNET_TIME_Absolute wire_deadline,
- json_t *wire_details,
- const struct GNUNET_HashCode *h_contract,
- const struct TALER_CoinSpendPublicKeyP *coin_pub,
- const struct TALER_DenominationSignature *denom_sig,
- const struct TALER_DenominationPublicKey *denom_pub,
- struct GNUNET_TIME_Absolute timestamp,
- uint64_t transaction_id,
- const struct TALER_MerchantPublicKeyP *merchant_pub,
- struct GNUNET_TIME_Absolute refund_deadline,
- const struct TALER_CoinSpendSignatureP *coin_sig,
- TALER_MINT_DepositResultCallback cb,
- void *cb_cls)
-{
- const struct TALER_MINT_Keys *key_state;
- const struct TALER_MINT_DenomPublicKey *dki;
- struct TALER_MINT_DepositHandle *dh;
- struct TALER_MINT_Context *ctx;
- json_t *deposit_obj;
- CURL *eh;
- struct GNUNET_HashCode h_wire;
- struct TALER_Amount amount_without_fee;
-
- (void) TALER_round_abs_time (&wire_deadline);
- if (GNUNET_YES !=
- MAH_handle_is_ready (mint))
- {
- GNUNET_break (0);
- return NULL;
- }
- /* initialize h_wire */
- if (GNUNET_OK !=
- TALER_hash_json (wire_details,
- &h_wire))
- {
- GNUNET_break (0);
- return NULL;
- }
- key_state = TALER_MINT_get_keys (mint);
- dki = TALER_MINT_get_denomination_key (key_state,
- denom_pub);
- if (NULL == dki)
- {
- TALER_LOG_WARNING ("Denomination key unknown to mint\n");
- return NULL;
- }
- if (GNUNET_SYSERR ==
- TALER_amount_subtract (&amount_without_fee,
- amount,
- &dki->fee_deposit))
- {
- GNUNET_break (0);
- return NULL;
- }
-
- if (GNUNET_OK !=
- verify_signatures (dki,
- amount,
- &h_wire,
- h_contract,
- coin_pub,
- denom_sig,
- denom_pub,
- timestamp,
- transaction_id,
- merchant_pub,
- refund_deadline,
- coin_sig))
- {
- GNUNET_break_op (0);
- return NULL;
- }
-
- deposit_obj = json_pack ("{s:o, s:O," /* f/wire */
- " s:o, s:o," /* H_wire, H_contract */
- " s:o, s:o," /* coin_pub, denom_pub */
- " s:o, s:o," /* ub_sig, timestamp */
- " s:I, s:o," /* transaction id, merchant_pub */
- " s:o, s:o," /* refund_deadline, wire_deadline */
- " s:o}", /* coin_sig */
- "f", TALER_json_from_amount (amount),
- "wire", wire_details,
- "H_wire", TALER_json_from_data (&h_wire,
- sizeof (h_wire)),
- "H_contract", TALER_json_from_data (h_contract,
- sizeof (struct GNUNET_HashCode)),
- "coin_pub", TALER_json_from_data (coin_pub,
- sizeof (*coin_pub)),
- "denom_pub", TALER_json_from_rsa_public_key (denom_pub->rsa_public_key),
- "ub_sig", TALER_json_from_rsa_signature (denom_sig->rsa_signature),
- "timestamp", TALER_json_from_abs (timestamp),
- "transaction_id", (json_int_t) transaction_id,
- "merchant_pub", TALER_json_from_data (merchant_pub,
- sizeof (*merchant_pub)),
- "refund_deadline", TALER_json_from_abs (refund_deadline),
- "edate", TALER_json_from_abs (wire_deadline),
- "coin_sig", TALER_json_from_data (coin_sig,
- sizeof (*coin_sig))
- );
-
- dh = GNUNET_new (struct TALER_MINT_DepositHandle);
- dh->mint = mint;
- dh->cb = cb;
- dh->cb_cls = cb_cls;
- dh->url = MAH_path_to_url (mint, "/deposit");
- dh->depconf.purpose.size = htonl (sizeof (struct TALER_DepositConfirmationPS));
- dh->depconf.purpose.purpose = htonl (TALER_SIGNATURE_MINT_CONFIRM_DEPOSIT);
- dh->depconf.h_contract = *h_contract;
- dh->depconf.h_wire = h_wire;
- dh->depconf.transaction_id = GNUNET_htonll (transaction_id);
- dh->depconf.timestamp = GNUNET_TIME_absolute_hton (timestamp);
- dh->depconf.refund_deadline = GNUNET_TIME_absolute_hton (refund_deadline);
- TALER_amount_hton (&dh->depconf.amount_without_fee,
- &amount_without_fee);
- dh->depconf.coin_pub = *coin_pub;
- dh->depconf.merchant = *merchant_pub;
- dh->amount_with_fee = *amount;
- dh->coin_value = dki->value;
-
- eh = curl_easy_init ();
- GNUNET_assert (NULL != (dh->json_enc =
- json_dumps (deposit_obj,
- JSON_COMPACT)));
- json_decref (deposit_obj);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "URL for deposit: `%s'\n",
- dh->url);
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_URL,
- dh->url));
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_POSTFIELDS,
- dh->json_enc));
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_POSTFIELDSIZE,
- strlen (dh->json_enc)));
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_WRITEFUNCTION,
- &MAC_download_cb));
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_WRITEDATA,
- &dh->db));
- ctx = MAH_handle_to_context (mint);
- dh->job = MAC_job_add (ctx,
- eh,
- GNUNET_YES,
- &handle_deposit_finished,
- dh);
- return dh;
-}
-
-
-/**
- * Cancel a deposit permission request. This function cannot be used
- * on a request handle if a response is already served for it.
- *
- * @param deposit the deposit permission request handle
- */
-void
-TALER_MINT_deposit_cancel (struct TALER_MINT_DepositHandle *deposit)
-{
- if (NULL != deposit->job)
- {
- MAC_job_cancel (deposit->job);
- deposit->job = NULL;
- }
- GNUNET_free_non_null (deposit->db.buf);
- GNUNET_free (deposit->url);
- GNUNET_free (deposit->json_enc);
- GNUNET_free (deposit);
-}
-
-
-/* end of mint_api_deposit.c */