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/*
This file is part of TALER
Copyright (C) 2015-2018 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 taler-exchange-wire.c
* @brief Create signed response for /wire requests.
* @author Christian Grothoff
*/
#include <platform.h>
#include <jansson.h>
#include <gnunet/gnunet_json_lib.h>
#include "taler_crypto_lib.h"
#include "taler_util.h"
#include "taler_json_lib.h"
#include "taler_exchangedb_lib.h"
#include "taler_signatures.h"
/**
* Filename of the master private key.
*/
static char *masterkeyfile;
/**
* Private key for signing.
*/
static struct TALER_MasterPrivateKeyP master_priv;
/**
* Return value from main().
*/
static int global_ret;
/**
* Function called with information about a wire account. Signs
* the account's wire details and writes out the JSON file to disk.
*
* @param cls closure
* @param ai account information
*/
static void
sign_account_data (void *cls,
const struct TALER_EXCHANGEDB_AccountInfo *ai)
{
json_t *wire;
char *json_out;
FILE *out;
int ret;
(void) cls;
if (GNUNET_NO == ai->credit_enabled)
return;
if (NULL == ai->wire_response_filename)
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
ai->section_name,
"WIRE_RESPONSE");
global_ret = 1;
return;
}
wire = TALER_JSON_exchange_wire_signature_make (ai->payto_url,
&master_priv);
GNUNET_assert (NULL != wire);
json_out = json_dumps (wire,
JSON_INDENT (2));
json_decref (wire);
GNUNET_assert (NULL != json_out);
if (GNUNET_OK !=
GNUNET_DISK_directory_create_for_file (ai->wire_response_filename))
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
"mkdir",
ai->wire_response_filename);
global_ret = 1;
free (json_out);
return;
}
out = fopen (ai->wire_response_filename,
"w+");
if (NULL == out)
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
"fopen",
ai->wire_response_filename);
global_ret = 1;
free (json_out);
return;
}
ret = fprintf (out,
"%s",
json_out);
if ( (0 == fclose (out)) &&
(-1 != ret) )
fprintf (stdout,
"Created wire account file `%s'\n",
ai->wire_response_filename);
else
fprintf (stderr,
"Failure creating wire account file `%s': %s\n",
ai->wire_response_filename,
strerror (errno));
free (json_out);
}
/**
* Main function that will be run.
*
* @param cls closure
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param cfg configuration
*/
static void
run (void *cls,
char *const *args,
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_CRYPTO_EddsaPrivateKey *eddsa_priv;
char *masters;
struct GNUNET_CRYPTO_EddsaPublicKey mpub;
struct GNUNET_CRYPTO_EddsaPublicKey mpub_cfg;
(void) cls;
(void) args;
(void) cfgfile;
if ( (NULL == masterkeyfile) &&
(GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
"exchange",
"MASTER_PRIV_FILE",
&masterkeyfile)) )
{
fprintf (stderr,
"Master key file not given in neither configuration nor command-line\n");
global_ret = 1;
return;
}
if (GNUNET_YES !=
GNUNET_DISK_file_test (masterkeyfile))
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Exchange master private key `%s' does not exist yet, creating it!\n",
masterkeyfile);
eddsa_priv = GNUNET_CRYPTO_eddsa_key_create_from_file (masterkeyfile);
if (NULL == eddsa_priv)
{
fprintf (stderr,
"Failed to initialize master key from file `%s'\n",
masterkeyfile);
global_ret = 1;
return;
}
master_priv.eddsa_priv = *eddsa_priv;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"exchange",
"MASTER_PUBLIC_KEY",
&masters))
{
fprintf (stderr,
"Master public key option missing in configuration\n");
global_ret = 1;
return;
}
GNUNET_CRYPTO_eddsa_key_get_public (eddsa_priv,
&mpub);
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (masters,
strlen (masters),
&mpub_cfg,
sizeof (mpub_cfg)))
{
fprintf (stderr,
"Master public key `%s' in configuration is not a valid key\n",
masters);
GNUNET_free (masters);
global_ret = 1;
return;
}
if (0 != GNUNET_memcmp (&mpub,
&mpub_cfg))
{
fprintf (stderr,
"Master public key `%s' in configuration does not match our master private key from `%s'!\n",
masters,
masterkeyfile);
GNUNET_free (masters);
global_ret = 1;
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Signing /wire response with private key matching public key `%s'\n",
masters);
GNUNET_free (masters);
TALER_EXCHANGEDB_find_accounts (cfg,
&sign_account_data,
NULL);
GNUNET_free (eddsa_priv);
}
/**
* The main function of the taler-exchange-wire tool. This tool is
* used to sign the bank account details using the master key.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc,
char *const *argv)
{
const struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_filename ('m',
"master-key",
"FILENAME",
"master key file (private key)",
&masterkeyfile),
GNUNET_GETOPT_OPTION_END
};
/* force linker to link against libtalerutil; if we do
not do this, the linker may "optimize" libtalerutil
away and skip #TALER_OS_init(), which we do need */
(void) TALER_project_data_default ();
GNUNET_assert (GNUNET_OK ==
GNUNET_log_setup ("taler-exchange-wire",
"WARNING",
NULL));
if (GNUNET_OK !=
GNUNET_PROGRAM_run (argc, argv,
"taler-exchange-wire",
"Setup /wire response",
options,
&run, NULL))
return 1;
return global_ret;
}
/* end of taler-exchange-wire.c */
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