510 lines
13 KiB
C
510 lines
13 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2018 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 <http://www.gnu.org/licenses/>
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*/
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/**
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* @file json/json_wire.c
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* @brief helper functions to generate or check /wire replies
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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 "taler_util.h"
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#include "taler_json_lib.h"
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/* Taken from GNU gettext */
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/**
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* Entry in the country table.
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*/
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struct CountryTableEntry
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{
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/**
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* 2-Character international country code.
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*/
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const char *code;
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/**
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* Long English name of the country.
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*/
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const char *english;
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};
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/* Keep the following table in sync with gettext.
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WARNING: the entries should stay sorted according to the code */
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/**
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* List of country codes.
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*/
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static const struct CountryTableEntry country_table[] = {
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{ "AE", "U.A.E." },
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{ "AF", "Afghanistan" },
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{ "AL", "Albania" },
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{ "AM", "Armenia" },
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{ "AN", "Netherlands Antilles" },
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{ "AR", "Argentina" },
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{ "AT", "Austria" },
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{ "AU", "Australia" },
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{ "AZ", "Azerbaijan" },
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{ "BA", "Bosnia and Herzegovina" },
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{ "BD", "Bangladesh" },
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{ "BE", "Belgium" },
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{ "BG", "Bulgaria" },
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{ "BH", "Bahrain" },
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{ "BN", "Brunei Darussalam" },
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{ "BO", "Bolivia" },
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{ "BR", "Brazil" },
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{ "BT", "Bhutan" },
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{ "BY", "Belarus" },
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{ "BZ", "Belize" },
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{ "CA", "Canada" },
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{ "CG", "Congo" },
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{ "CH", "Switzerland" },
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{ "CI", "Cote d'Ivoire" },
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{ "CL", "Chile" },
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{ "CM", "Cameroon" },
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{ "CN", "People's Republic of China" },
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{ "CO", "Colombia" },
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{ "CR", "Costa Rica" },
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{ "CS", "Serbia and Montenegro" },
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{ "CZ", "Czech Republic" },
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{ "DE", "Germany" },
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{ "DK", "Denmark" },
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{ "DO", "Dominican Republic" },
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{ "DZ", "Algeria" },
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{ "EC", "Ecuador" },
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{ "EE", "Estonia" },
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{ "EG", "Egypt" },
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{ "ER", "Eritrea" },
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{ "ES", "Spain" },
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{ "ET", "Ethiopia" },
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{ "FI", "Finland" },
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{ "FO", "Faroe Islands" },
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{ "FR", "France" },
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{ "GB", "United Kingdom" },
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{ "GD", "Caribbean" },
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{ "GE", "Georgia" },
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{ "GL", "Greenland" },
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{ "GR", "Greece" },
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{ "GT", "Guatemala" },
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{ "HK", "Hong Kong" },
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{ "HK", "Hong Kong S.A.R." },
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{ "HN", "Honduras" },
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{ "HR", "Croatia" },
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{ "HT", "Haiti" },
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{ "HU", "Hungary" },
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{ "ID", "Indonesia" },
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{ "IE", "Ireland" },
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{ "IL", "Israel" },
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{ "IN", "India" },
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{ "IQ", "Iraq" },
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{ "IR", "Iran" },
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{ "IS", "Iceland" },
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{ "IT", "Italy" },
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{ "JM", "Jamaica" },
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{ "JO", "Jordan" },
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{ "JP", "Japan" },
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{ "KE", "Kenya" },
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{ "KG", "Kyrgyzstan" },
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{ "KH", "Cambodia" },
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{ "KR", "South Korea" },
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{ "KW", "Kuwait" },
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{ "KZ", "Kazakhstan" },
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{ "LA", "Laos" },
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{ "LB", "Lebanon" },
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{ "LI", "Liechtenstein" },
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{ "LK", "Sri Lanka" },
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{ "LT", "Lithuania" },
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{ "LU", "Luxembourg" },
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{ "LV", "Latvia" },
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{ "LY", "Libya" },
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{ "MA", "Morocco" },
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{ "MC", "Principality of Monaco" },
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{ "MD", "Moldava" },
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{ "MD", "Moldova" },
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{ "ME", "Montenegro" },
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{ "MK", "Former Yugoslav Republic of Macedonia" },
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{ "ML", "Mali" },
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{ "MM", "Myanmar" },
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{ "MN", "Mongolia" },
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{ "MO", "Macau S.A.R." },
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{ "MT", "Malta" },
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{ "MV", "Maldives" },
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{ "MX", "Mexico" },
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{ "MY", "Malaysia" },
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{ "NG", "Nigeria" },
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{ "NI", "Nicaragua" },
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{ "NL", "Netherlands" },
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{ "NO", "Norway" },
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{ "NP", "Nepal" },
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{ "NZ", "New Zealand" },
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{ "OM", "Oman" },
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{ "PA", "Panama" },
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{ "PE", "Peru" },
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{ "PH", "Philippines" },
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{ "PK", "Islamic Republic of Pakistan" },
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{ "PL", "Poland" },
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{ "PR", "Puerto Rico" },
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{ "PT", "Portugal" },
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{ "PY", "Paraguay" },
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{ "QA", "Qatar" },
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{ "RE", "Reunion" },
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{ "RO", "Romania" },
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{ "RS", "Serbia" },
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{ "RU", "Russia" },
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{ "RW", "Rwanda" },
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{ "SA", "Saudi Arabia" },
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{ "SE", "Sweden" },
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{ "SG", "Singapore" },
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{ "SI", "Slovenia" },
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{ "SK", "Slovak" },
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{ "SN", "Senegal" },
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{ "SO", "Somalia" },
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{ "SR", "Suriname" },
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{ "SV", "El Salvador" },
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{ "SY", "Syria" },
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{ "TH", "Thailand" },
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{ "TJ", "Tajikistan" },
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{ "TM", "Turkmenistan" },
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{ "TN", "Tunisia" },
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{ "TR", "Turkey" },
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{ "TT", "Trinidad and Tobago" },
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{ "TW", "Taiwan" },
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{ "TZ", "Tanzania" },
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{ "UA", "Ukraine" },
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{ "US", "United States" },
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{ "UY", "Uruguay" },
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{ "VA", "Vatican" },
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{ "VE", "Venezuela" },
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{ "VN", "Viet Nam" },
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{ "YE", "Yemen" },
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{ "ZA", "South Africa" },
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{ "ZW", "Zimbabwe" }
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};
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/**
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* Country code comparator function, for binary search with bsearch().
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*
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* @param ptr1 pointer to a `struct table_entry`
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* @param ptr2 pointer to a `struct table_entry`
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* @return result of strncmp()'ing the 2-digit country codes of the entries
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*/
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static int
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cmp_country_code (const void *ptr1,
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const void *ptr2)
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{
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const struct CountryTableEntry *cc1 = ptr1;
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const struct CountryTableEntry *cc2 = ptr2;
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return strncmp (cc1->code,
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cc2->code,
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2);
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}
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/**
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* Validates given IBAN according to the European Banking Standards. See:
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* http://www.europeanpaymentscouncil.eu/documents/ECBS%20IBAN%20standard%20EBS204_V3.2.pdf
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*
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* @param iban the IBAN number to validate
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* @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
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*/
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static int
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validate_iban (const char *iban)
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{
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char cc[2];
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char ibancpy[35];
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struct CountryTableEntry cc_entry;
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unsigned int len;
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char *nbuf;
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unsigned long long dividend;
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unsigned long long remainder;
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int nread;
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int ret;
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unsigned int i;
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unsigned int j;
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len = strlen (iban);
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if (len > 34)
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{
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GNUNET_log (GNUNET_ERROR_TYPE_INFO,
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"IBAN number too long to be valid\n");
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return GNUNET_NO;
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}
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strncpy (cc, iban, 2);
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strncpy (ibancpy, iban + 4, len - 4);
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strncpy (ibancpy + len - 4, iban, 4);
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ibancpy[len] = '\0';
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cc_entry.code = cc;
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cc_entry.english = NULL;
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if (NULL ==
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bsearch (&cc_entry,
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country_table,
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sizeof (country_table) / sizeof (struct CountryTableEntry),
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sizeof (struct CountryTableEntry),
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&cmp_country_code))
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{
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GNUNET_log (GNUNET_ERROR_TYPE_INFO,
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"Country code `%c%c' not supported\n",
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cc[0],
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cc[1]);
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return GNUNET_NO;
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}
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nbuf = GNUNET_malloc ((len * 2) + 1);
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for (i = 0, j = 0; i < len; i++)
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{
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if (isalpha ((unsigned char) ibancpy[i]))
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{
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if (2 != snprintf (&nbuf[j],
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3,
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"%2u",
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(ibancpy[i] - 'A' + 10)))
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{
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GNUNET_free (nbuf);
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return GNUNET_NO;
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}
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j += 2;
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continue;
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}
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nbuf[j] = ibancpy[i];
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j++;
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}
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for (j = 0; '\0' != nbuf[j]; j++)
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GNUNET_assert (isdigit ( (unsigned char) nbuf[j]));
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GNUNET_assert (sizeof(dividend) >= 8);
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remainder = 0;
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for (unsigned int i = 0; i<j; i += 16)
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{
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if (1 !=
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(ret = sscanf (&nbuf[i],
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"%16llu %n",
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÷nd,
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&nread)))
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{
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GNUNET_free (nbuf);
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GNUNET_break_op (0);
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return GNUNET_NO;
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}
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if (0 != remainder)
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dividend += remainder * (pow (10, nread));
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remainder = dividend % 97;
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}
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GNUNET_free (nbuf);
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if (1 == remainder)
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return GNUNET_YES;
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GNUNET_log (GNUNET_ERROR_TYPE_INFO,
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"IBAN checksum wrong\n");
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return GNUNET_NO;
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}
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/**
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* Valudate payto://iban/ account URL (only account information,
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* wire subject and amount are ignored).
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*
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* @param account_url URL to parse
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* @return #GNUNET_YES if @a account_url is a valid payto://iban URI,
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* #GNUNET_NO if @a account_url is a payto URI of a different type,
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* #GNUNET_SYSERR if the IBAN (checksum) is incorrect
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*/
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int
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validate_payto_iban (const char *account_url)
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{
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const char *iban;
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const char *q;
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char *result;
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#define PREFIX "payto://iban/"
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if (0 != strncasecmp (account_url,
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PREFIX,
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strlen (PREFIX)))
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return GNUNET_NO;
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iban = &account_url[strlen (PREFIX)];
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#undef PREFIX
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q = strchr (iban,
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'?');
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if (NULL != q)
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{
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result = GNUNET_strndup (iban,
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q - iban);
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}
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else
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{
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result = GNUNET_strdup (iban);
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}
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if (GNUNET_OK !=
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validate_iban (result))
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{
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GNUNET_free (result);
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return GNUNET_SYSERR;
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}
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GNUNET_free (result);
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return GNUNET_YES;
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}
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/**
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* Compute the hash of the given wire details. The resulting
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* hash is what is put into the contract.
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*
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* @param wire_s wire details to hash
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* @param hc[out] set to the hash
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* @return #GNUNET_OK on success, #GNUNET_SYSERR if @a wire_s is malformed
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*/
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int
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TALER_JSON_merchant_wire_signature_hash (const json_t *wire_s,
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struct GNUNET_HashCode *hc)
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{
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const char *payto_url;
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const char *salt;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_string ("url", &payto_url),
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GNUNET_JSON_spec_string ("salt", &salt),
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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 (wire_s,
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spec,
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NULL, 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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TALER_merchant_wire_signature_hash (payto_url,
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salt,
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hc);
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return GNUNET_OK;
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}
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/**
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* Check the signature in @a wire_s.
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*
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* @param wire_s signed wire information of an exchange
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* @param master_pub master public key of the exchange
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* @return #GNUNET_OK if signature is valid
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*/
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int
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TALER_JSON_exchange_wire_signature_check (const json_t *wire_s,
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const struct
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TALER_MasterPublicKeyP *master_pub)
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{
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const char *payto_url;
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struct TALER_MasterSignatureP master_sig;
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struct GNUNET_JSON_Specification spec[] = {
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GNUNET_JSON_spec_string ("url", &payto_url),
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GNUNET_JSON_spec_fixed_auto ("master_sig", &master_sig),
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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 (wire_s,
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spec,
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NULL, 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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if (GNUNET_SYSERR == validate_payto_iban (payto_url))
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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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return TALER_exchange_wire_signature_check (payto_url,
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master_pub,
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&master_sig);
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}
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/**
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* Create a signed wire statement for the given account.
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*
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* @param payto_url account specification
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* @param master_priv private key to sign with, NULL to not sign
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*/
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json_t *
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TALER_JSON_exchange_wire_signature_make (const char *payto_url,
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const struct
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TALER_MasterPrivateKeyP *master_priv)
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{
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struct TALER_MasterSignatureP master_sig;
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TALER_exchange_wire_signature_make (payto_url,
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master_priv,
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&master_sig);
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return json_pack ("{s:s, s:o}",
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"url", payto_url,
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"master_sig", GNUNET_JSON_from_data_auto (&master_sig));
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}
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/**
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* Obtain the wire method associated with the given
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* wire account details. @a wire_s must contain a payto://-URL
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* under 'url'.
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*
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* @return NULL on error
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*/
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char *
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TALER_JSON_wire_to_payto (const json_t *wire_s)
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{
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json_t *payto_o;
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const char *payto_str;
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payto_o = json_object_get (wire_s,
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"url");
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if ( (NULL == payto_o) ||
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(NULL == (payto_str = json_string_value (payto_o))) )
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{
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Fatally malformed wire record encountered: lacks payto://-url\n");
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return NULL;
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}
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return GNUNET_strdup (payto_str);
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}
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/**
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* Obtain the wire method associated with the given
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* wire account details. @a wire_s must contain a payto://-URL
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* under 'url'.
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*
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* @return NULL on error
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*/
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char *
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TALER_JSON_wire_to_method (const json_t *wire_s)
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{
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json_t *payto_o;
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const char *payto_str;
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payto_o = json_object_get (wire_s,
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"url");
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if ( (NULL == payto_o) ||
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(NULL == (payto_str = json_string_value (payto_o))) )
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{
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Fatally malformed wire record encountered: lacks payto://-url\n");
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return NULL;
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}
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return TALER_payto_get_method (payto_str);
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}
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/* end of json_wire.c */
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