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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 Inria & 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, see <http://www.gnu.org/licenses/>
*/
/**
* @file exchangedb/exchangedb_signkeys.c
* @brief I/O operations for the Exchange's private online signing keys
* @author Florian Dold
* @author Benedikt Mueller
* @author Sree Harsha Totakura
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_exchangedb_lib.h"
/**
* Closure for the #signkeys_iterate_dir_iter().
*/
struct SignkeysIterateContext
{
/**
* Function to call on each signing key.
*/
TALER_EXCHANGEDB_SigningKeyIterator it;
/**
* Closure for @e it.
*/
void *it_cls;
};
/**
* Function called on each file in the directory with our signing
* keys. Parses the file and calls the iterator from @a cls.
*
* @param cls the `struct SignkeysIterateContext *`
* @param filename name of the file to parse
* @return #GNUNET_OK to continue,
* #GNUNET_NO to stop iteration without error,
* #GNUNET_SYSERR to stop iteration with error
*/
static int
signkeys_iterate_dir_iter (void *cls,
const char *filename)
{
struct SignkeysIterateContext *skc = cls;
ssize_t nread;
struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP issue;
nread = GNUNET_DISK_fn_read (filename,
&issue,
sizeof (struct
TALER_EXCHANGEDB_PrivateSigningKeyInformationP));
if (nread != sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Invalid signkey file `%s': wrong size (%d, expected %u)\n",
filename,
(int) nread,
(unsigned int) sizeof (struct
TALER_EXCHANGEDB_PrivateSigningKeyInformationP));
return GNUNET_OK;
}
if (0 == GNUNET_TIME_absolute_get_remaining
(GNUNET_TIME_absolute_ntoh (issue.issue.expire)).rel_value_us)
{
if (0 != unlink (filename))
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
"unlink",
filename);
return GNUNET_OK; /* yes, we had an error, but continue to iterate anyway */
}
/* Expired file deleted, continue to iterate -without- calling iterator
as this key is expired */
return GNUNET_OK;
}
return skc->it (skc->it_cls,
filename,
&issue);
}
/**
* Call @a it for each signing key found in the @a exchange_base_dir.
*
* @param exchange_base_dir base directory for the exchange,
* the signing keys must be in the #TALER_EXCHANGEDB_DIR_SIGNING_KEYS
* subdirectory
* @param it function to call on each signing key
* @param it_cls closure for @a it
* @return number of files found (may not match
* number of keys given to @a it as malformed
* files are simply skipped), -1 on error
*/
int
TALER_EXCHANGEDB_signing_keys_iterate (const char *exchange_base_dir,
TALER_EXCHANGEDB_SigningKeyIterator it,
void *it_cls)
{
char *signkey_dir;
struct SignkeysIterateContext skc;
int ret;
GNUNET_asprintf (&signkey_dir,
"%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_SIGNING_KEYS,
exchange_base_dir);
skc.it = it;
skc.it_cls = it_cls;
ret = GNUNET_DISK_directory_scan (signkey_dir,
&signkeys_iterate_dir_iter,
&skc);
GNUNET_free (signkey_dir);
return ret;
}
/**
* Obtain the name of the directory we use to store signing
* keys created at time @a start.
*
* @param exchange_directory base director where we store key material
* @param start time at which we create the signing key
* @return name of the directory we should use, basically "$EXCHANGEDIR/$TIME/";
* (valid until next call to this function)
*/
static char *
get_signkey_file (const char *exchange_directory,
struct GNUNET_TIME_Absolute start)
{
char *fn;
GNUNET_asprintf (&fn,
"%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_SIGNING_KEYS
DIR_SEPARATOR_STR "%llu",
exchange_directory,
(unsigned long long) start.abs_value_us);
return fn;
}
/**
* Exports a signing key to the given file.
*
* @param exchange_base_dir base directory for the keys
* @param start start time of the validity for the key
* @param ski the signing key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_EXCHANGEDB_signing_key_write (const char *exchange_base_dir,
struct GNUNET_TIME_Absolute start,
const struct
TALER_EXCHANGEDB_PrivateSigningKeyInformationP
*ski)
{
char *skf;
ssize_t nwrite;
skf = get_signkey_file (exchange_base_dir,
start);
if (GNUNET_OK !=
GNUNET_DISK_directory_create_for_file (skf))
return GNUNET_SYSERR;
nwrite = GNUNET_DISK_fn_write (skf,
ski,
sizeof (struct
TALER_EXCHANGEDB_PrivateSigningKeyInformationP),
GNUNET_DISK_PERM_USER_WRITE
| GNUNET_DISK_PERM_USER_READ);
if (sizeof (struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP) != nwrite)
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
"write",
skf);
GNUNET_free (skf);
return GNUNET_SYSERR;
}
GNUNET_free (skf);
return GNUNET_OK;
}
/* end of exchangedb_signkeys.c */
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