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authorFlorian Dold <florian.dold@gmail.com>2020-01-17 23:40:33 +0100
committerFlorian Dold <florian.dold@gmail.com>2020-01-17 23:40:44 +0100
commitd95f2a9e437b946bba66c2a0054524fc2e320621 (patch)
treed09f50a8aa04b57877139a3934d669c4a316d533 /src/json
parentf0d8311b1ccbe9e816127ca9a4de65a6f605c4b9 (diff)
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DCE, part one
Diffstat (limited to 'src/json')
-rw-r--r--src/json/json_wire.c338
1 files changed, 338 insertions, 0 deletions
diff --git a/src/json/json_wire.c b/src/json/json_wire.c
index 5052f458..4c5b7d64 100644
--- a/src/json/json_wire.c
+++ b/src/json/json_wire.c
@@ -24,6 +24,338 @@
#include "taler_json_lib.h"
+/* Taken from GNU gettext */
+
+/**
+ * Entry in the country table.
+ */
+struct CountryTableEntry
+{
+ /**
+ * 2-Character international country code.
+ */
+ const char *code;
+
+ /**
+ * Long English name of the country.
+ */
+ const char *english;
+};
+
+
+/* Keep the following table in sync with gettext.
+ WARNING: the entries should stay sorted according to the code */
+/**
+ * List of country codes.
+ */
+static const struct CountryTableEntry country_table[] = {
+ { "AE", "U.A.E." },
+ { "AF", "Afghanistan" },
+ { "AL", "Albania" },
+ { "AM", "Armenia" },
+ { "AN", "Netherlands Antilles" },
+ { "AR", "Argentina" },
+ { "AT", "Austria" },
+ { "AU", "Australia" },
+ { "AZ", "Azerbaijan" },
+ { "BA", "Bosnia and Herzegovina" },
+ { "BD", "Bangladesh" },
+ { "BE", "Belgium" },
+ { "BG", "Bulgaria" },
+ { "BH", "Bahrain" },
+ { "BN", "Brunei Darussalam" },
+ { "BO", "Bolivia" },
+ { "BR", "Brazil" },
+ { "BT", "Bhutan" },
+ { "BY", "Belarus" },
+ { "BZ", "Belize" },
+ { "CA", "Canada" },
+ { "CG", "Congo" },
+ { "CH", "Switzerland" },
+ { "CI", "Cote d'Ivoire" },
+ { "CL", "Chile" },
+ { "CM", "Cameroon" },
+ { "CN", "People's Republic of China" },
+ { "CO", "Colombia" },
+ { "CR", "Costa Rica" },
+ { "CS", "Serbia and Montenegro" },
+ { "CZ", "Czech Republic" },
+ { "DE", "Germany" },
+ { "DK", "Denmark" },
+ { "DO", "Dominican Republic" },
+ { "DZ", "Algeria" },
+ { "EC", "Ecuador" },
+ { "EE", "Estonia" },
+ { "EG", "Egypt" },
+ { "ER", "Eritrea" },
+ { "ES", "Spain" },
+ { "ET", "Ethiopia" },
+ { "FI", "Finland" },
+ { "FO", "Faroe Islands" },
+ { "FR", "France" },
+ { "GB", "United Kingdom" },
+ { "GD", "Caribbean" },
+ { "GE", "Georgia" },
+ { "GL", "Greenland" },
+ { "GR", "Greece" },
+ { "GT", "Guatemala" },
+ { "HK", "Hong Kong" },
+ { "HK", "Hong Kong S.A.R." },
+ { "HN", "Honduras" },
+ { "HR", "Croatia" },
+ { "HT", "Haiti" },
+ { "HU", "Hungary" },
+ { "ID", "Indonesia" },
+ { "IE", "Ireland" },
+ { "IL", "Israel" },
+ { "IN", "India" },
+ { "IQ", "Iraq" },
+ { "IR", "Iran" },
+ { "IS", "Iceland" },
+ { "IT", "Italy" },
+ { "JM", "Jamaica" },
+ { "JO", "Jordan" },
+ { "JP", "Japan" },
+ { "KE", "Kenya" },
+ { "KG", "Kyrgyzstan" },
+ { "KH", "Cambodia" },
+ { "KR", "South Korea" },
+ { "KW", "Kuwait" },
+ { "KZ", "Kazakhstan" },
+ { "LA", "Laos" },
+ { "LB", "Lebanon" },
+ { "LI", "Liechtenstein" },
+ { "LK", "Sri Lanka" },
+ { "LT", "Lithuania" },
+ { "LU", "Luxembourg" },
+ { "LV", "Latvia" },
+ { "LY", "Libya" },
+ { "MA", "Morocco" },
+ { "MC", "Principality of Monaco" },
+ { "MD", "Moldava" },
+ { "MD", "Moldova" },
+ { "ME", "Montenegro" },
+ { "MK", "Former Yugoslav Republic of Macedonia" },
+ { "ML", "Mali" },
+ { "MM", "Myanmar" },
+ { "MN", "Mongolia" },
+ { "MO", "Macau S.A.R." },
+ { "MT", "Malta" },
+ { "MV", "Maldives" },
+ { "MX", "Mexico" },
+ { "MY", "Malaysia" },
+ { "NG", "Nigeria" },
+ { "NI", "Nicaragua" },
+ { "NL", "Netherlands" },
+ { "NO", "Norway" },
+ { "NP", "Nepal" },
+ { "NZ", "New Zealand" },
+ { "OM", "Oman" },
+ { "PA", "Panama" },
+ { "PE", "Peru" },
+ { "PH", "Philippines" },
+ { "PK", "Islamic Republic of Pakistan" },
+ { "PL", "Poland" },
+ { "PR", "Puerto Rico" },
+ { "PT", "Portugal" },
+ { "PY", "Paraguay" },
+ { "QA", "Qatar" },
+ { "RE", "Reunion" },
+ { "RO", "Romania" },
+ { "RS", "Serbia" },
+ { "RU", "Russia" },
+ { "RW", "Rwanda" },
+ { "SA", "Saudi Arabia" },
+ { "SE", "Sweden" },
+ { "SG", "Singapore" },
+ { "SI", "Slovenia" },
+ { "SK", "Slovak" },
+ { "SN", "Senegal" },
+ { "SO", "Somalia" },
+ { "SR", "Suriname" },
+ { "SV", "El Salvador" },
+ { "SY", "Syria" },
+ { "TH", "Thailand" },
+ { "TJ", "Tajikistan" },
+ { "TM", "Turkmenistan" },
+ { "TN", "Tunisia" },
+ { "TR", "Turkey" },
+ { "TT", "Trinidad and Tobago" },
+ { "TW", "Taiwan" },
+ { "TZ", "Tanzania" },
+ { "UA", "Ukraine" },
+ { "US", "United States" },
+ { "UY", "Uruguay" },
+ { "VA", "Vatican" },
+ { "VE", "Venezuela" },
+ { "VN", "Viet Nam" },
+ { "YE", "Yemen" },
+ { "ZA", "South Africa" },
+ { "ZW", "Zimbabwe" }
+};
+
+
+/**
+ * Country code comparator function, for binary search with bsearch().
+ *
+ * @param ptr1 pointer to a `struct table_entry`
+ * @param ptr2 pointer to a `struct table_entry`
+ * @return result of strncmp()'ing the 2-digit country codes of the entries
+ */
+static int
+cmp_country_code (const void *ptr1,
+ const void *ptr2)
+{
+ const struct CountryTableEntry *cc1 = ptr1;
+ const struct CountryTableEntry *cc2 = ptr2;
+
+ return strncmp (cc1->code,
+ cc2->code,
+ 2);
+}
+
+
+/**
+ * Validates given IBAN according to the European Banking Standards. See:
+ * http://www.europeanpaymentscouncil.eu/documents/ECBS%20IBAN%20standard%20EBS204_V3.2.pdf
+ *
+ * @param iban the IBAN number to validate
+ * @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
+ */
+static int
+validate_iban (const char *iban)
+{
+ char cc[2];
+ char ibancpy[35];
+ struct CountryTableEntry cc_entry;
+ unsigned int len;
+ char *nbuf;
+ unsigned long long dividend;
+ unsigned long long remainder;
+ int nread;
+ int ret;
+ unsigned int i;
+ unsigned int j;
+
+ len = strlen (iban);
+ if (len > 34)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "IBAN number too long to be valid\n");
+ return GNUNET_NO;
+ }
+ strncpy (cc, iban, 2);
+ strncpy (ibancpy, iban + 4, len - 4);
+ strncpy (ibancpy + len - 4, iban, 4);
+ ibancpy[len] = '\0';
+ cc_entry.code = cc;
+ cc_entry.english = NULL;
+ if (NULL ==
+ bsearch (&cc_entry,
+ country_table,
+ sizeof (country_table) / sizeof (struct CountryTableEntry),
+ sizeof (struct CountryTableEntry),
+ &cmp_country_code))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Country code `%c%c' not supported\n",
+ cc[0],
+ cc[1]);
+ return GNUNET_NO;
+ }
+ nbuf = GNUNET_malloc ((len * 2) + 1);
+ for (i = 0, j = 0; i < len; i++)
+ {
+ if (isalpha ((unsigned char) ibancpy[i]))
+ {
+ if (2 != snprintf (&nbuf[j],
+ 3,
+ "%2u",
+ (ibancpy[i] - 'A' + 10)))
+ {
+ GNUNET_free (nbuf);
+ return GNUNET_NO;
+ }
+ j += 2;
+ continue;
+ }
+ nbuf[j] = ibancpy[i];
+ j++;
+ }
+ for (j = 0; '\0' != nbuf[j]; j++)
+ GNUNET_assert (isdigit ( (unsigned char) nbuf[j]));
+ GNUNET_assert (sizeof(dividend) >= 8);
+ remainder = 0;
+ for (unsigned int i = 0; i<j; i += 16)
+ {
+ if (1 !=
+ (ret = sscanf (&nbuf[i],
+ "%16llu %n",
+ &dividend,
+ &nread)))
+ {
+ GNUNET_free (nbuf);
+ GNUNET_break_op (0);
+ return GNUNET_NO;
+ }
+ if (0 != remainder)
+ dividend += remainder * (pow (10, nread));
+ remainder = dividend % 97;
+ }
+ GNUNET_free (nbuf);
+ if (1 == remainder)
+ return GNUNET_YES;
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "IBAN checksum wrong\n");
+ return GNUNET_NO;
+}
+
+
+/**
+ * Valudate payto://iban/ account URL (only account information,
+ * wire subject and amount are ignored).
+ *
+ * @param account_url URL to parse
+ * @return #GNUNET_YES if @a account_url is a valid payto://iban URI,
+ * #GNUNET_NO if @a account_url is a payto URI of a different type,
+ * #GNUNET_SYSERR if the IBAN (checksum) is incorrect
+ */
+int
+validate_payto_iban (const char *account_url)
+{
+ const char *iban;
+ const char *q;
+ char *result;
+
+#define PREFIX "payto://iban/"
+ if (0 != strncasecmp (account_url,
+ PREFIX,
+ strlen (PREFIX)))
+ return GNUNET_NO;
+ iban = &account_url[strlen (PREFIX)];
+#undef PREFIX
+ q = strchr (iban,
+ '?');
+ if (NULL != q)
+ {
+ result = GNUNET_strndup (iban,
+ q - iban);
+ }
+ else
+ {
+ result = GNUNET_strdup (iban);
+ }
+ if (GNUNET_OK !=
+ validate_iban (result))
+ {
+ GNUNET_free (result);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_free (result);
+ return GNUNET_YES;
+}
+
+
/**
* Compute the hash of the given wire details. The resulting
* hash is what is put into the contract.
@@ -88,6 +420,12 @@ TALER_JSON_exchange_wire_signature_check (const json_t *wire_s,
return GNUNET_SYSERR;
}
+ if (GNUNET_SYSERR == validate_payto_iban (payto_url))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
return TALER_exchange_wire_signature_check (payto_url,
master_pub,
&master_sig);