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/*
This file is part of TALER
(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 backend/taler-merchant-httpd_auditors.c
* @brief logic this HTTPD keeps for each exchange we interact with
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler-merchant-httpd_auditors.h"
/**
* Our representation of an auditor.
*/
struct Auditor
{
/**
* Auditor's legal name.
*/
char *name;
/**
* Auditor's URI.
*/
char *uri;
/**
* Public key of the auditor.
*/
struct TALER_AuditorPublicKeyP public_key;
};
/**
* Array of the auditors this merchant is willing to accept.
*/
static struct Auditor *auditors;
/**
* The length of the #auditors array.
*/
static unsigned int nauditors;
/**
* JSON representation of the auditors accepted by this exchange.
*/
json_t *j_auditors;
/**
* Check if the given @a dk issued by exchange @a mh is audited by
* an auditor that is acceptable for this merchant. (And if the
* denomination is not yet expired or something silly like that.)
*
* @param mh exchange issuing @a dk
* @param dk a denomination issued by @a mh
* @param exchange_trusted #GNUNET_YES if the exchange of @a dk is trusted by config
* @return #GNUNET_OK if we accept this denomination
*/
int
TMH_AUDITORS_check_dk (struct TALER_EXCHANGE_Handle *mh,
const struct TALER_EXCHANGE_DenomPublicKey *dk,
int exchange_trusted)
{
const struct TALER_EXCHANGE_Keys *keys;
const struct TALER_EXCHANGE_AuditorInformation *ai;
unsigned int i;
unsigned int j;
if (0 == GNUNET_TIME_absolute_get_remaining (dk->deposit_valid_until).rel_value_us)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Denomination key offered by client has expired for deposits\n");
return GNUNET_SYSERR; /* expired */
}
if (GNUNET_YES == exchange_trusted)
return GNUNET_OK;
keys = TALER_EXCHANGE_get_keys (mh);
if (NULL == keys)
{
/* this should never happen, keys should have been successfully
obtained before we even got into this function */
GNUNET_break (0);
return GNUNET_SYSERR;
}
for (i=0;i<keys->num_auditors;i++)
{
ai = &keys->auditors[i];
for (j=0;j<ai->num_denom_keys;j++)
if (ai->denom_keys[j] == dk)
return GNUNET_OK;
}
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Denomination key %s offered by client not audited by accepted auditor\n",
GNUNET_h2s (&dk->h_key));
return GNUNET_NO;
}
/**
* Function called on each configuration section. Finds sections
* about auditors and parses the entries.
*
* @param cls closure, with a `const struct GNUNET_CONFIGURATION_Handle *`
* @param section name of the section
*/
static void
parse_auditors (void *cls,
const char *section)
{
const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
char *pks;
struct Auditor auditor;
if (0 != strncasecmp (section,
"auditor-",
strlen ("auditor-")))
return;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
section,
"NAME",
&auditor.name))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
section,
"NAME");
return;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
section,
"URI",
&auditor.uri))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
section,
"URI");
GNUNET_free (auditor.name);
return;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
section,
"PUBLIC_KEY",
&pks))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
section,
"PUBLIC_KEY");
GNUNET_free (auditor.name);
GNUNET_free (auditor.uri);
return;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_public_key_from_string (pks,
strlen (pks),
&auditor.public_key.eddsa_pub))
{
GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
section,
"PUBLIC_KEY",
"valid public key");
GNUNET_free (auditor.name);
GNUNET_free (auditor.uri);
GNUNET_free (pks);
return;
}
GNUNET_free (pks);
GNUNET_array_append (auditors,
nauditors,
auditor);
}
/**
* Parses auditor information from the configuration.
*
* @param cfg the configuration
* @return the number of auditors found; #GNUNET_SYSERR upon error in
* parsing.
*/
int
TMH_AUDITORS_init (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
unsigned int cnt;
GNUNET_CONFIGURATION_iterate_sections (cfg,
&parse_auditors,
(void *) cfg);
/* Generate preferred exchange(s) array. */
j_auditors = json_array ();
for (cnt = 0; cnt < nauditors; cnt++)
json_array_append_new (j_auditors,
json_pack ("{s:s, s:o, s:s}",
"name", auditors[cnt].name,
"auditor_pub", TALER_json_from_data (&auditors[cnt].public_key,
sizeof (struct TALER_AuditorPublicKeyP)),
"uri", auditors[cnt].uri));
return nauditors;
}
/**
* Release auditor information state.
*/
void
TMH_AUDITORS_done ()
{
unsigned int i;
json_decref (j_auditors);
j_auditors = NULL;
for (i=0;i<nauditors;i++)
{
GNUNET_free (auditors[i].name);
GNUNET_free (auditors[i].uri);
}
GNUNET_free (auditors);
auditors = NULL;
nauditors = 0;
}
/* end of taler-merchant-httpd_auditors.c */
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