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/*
This file is part of GNUnet.
Copyright (C) 2012-2015 GNUnet e.V.
GNUnet 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.
GNUnet 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 GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @author Martin Schanzenbach
* @file src/identity-provider/gnunet-service-identity-provider.c
* @brief Identity Token Service
*
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include <jansson.h>
#include "gnunet_signatures.h"
/**
* The token
*/
static char* token;
/**
* Weather to print the token
*/
static int print_token;
static void
run (void *cls,
char *const *args,
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *c)
{
char *payload;
char *header;
//Get token parts
const char *header_b64;
const char *payload_b64;
const char *signature_b32;
const char *keystring;
char *data;
json_t *payload_json;
json_t *keystring_json;
json_error_t error;
struct GNUNET_CRYPTO_EcdsaPublicKey key;
struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
struct GNUNET_CRYPTO_EcdsaSignature sig;
if (NULL == token)
{
GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
_("Option `-t' is required\n"));
return;
}
header_b64 = strtok (token, ".");
payload_b64 = strtok (NULL, ".");
signature_b32 = strtok (NULL, ".");
if ( (NULL == header_b64) ||
(NULL == payload_b64) ||
(NULL == signature_b32) )
{
GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
_("Token `%s' is malformed\n"),
token);
GNUNET_free (token);
token = NULL;
return;
}
//Decode payload
GNUNET_STRINGS_base64_decode (payload_b64,
strlen (payload_b64),
&payload);
//Decode header
GNUNET_STRINGS_base64_decode (header_b64,
strlen (header_b64),
&header);
GNUNET_asprintf(&data,
"%s,%s",
header_b64,
payload_b64);
char *val = GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) + strlen (data));
purpose = (struct GNUNET_CRYPTO_EccSignaturePurpose*)val;
purpose->size = htonl(sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) + strlen (data));
purpose->purpose = htonl(GNUNET_SIGNATURE_PURPOSE_GNUID_TOKEN);
GNUNET_memcpy (&purpose[1], data, strlen(data));
GNUNET_free (data);
GNUNET_free (token);
token = NULL;
if (print_token)
printf ("Token:\nHeader:\t\t%s\nPayload:\t%s\n",
header,
payload);
GNUNET_free (header);
payload_json = json_loads (payload, 0, &error);
GNUNET_free (payload);
if ((NULL == payload_json) || (! json_is_object (payload_json)) )
{
GNUNET_free (val);
return;
}
keystring_json = json_object_get (payload_json, "iss");
if (! json_is_string (keystring_json))
{
GNUNET_free (val);
return;
}
keystring = json_string_value (keystring_json);
if (GNUNET_OK !=
GNUNET_CRYPTO_ecdsa_public_key_from_string (keystring,
strlen (keystring),
&key))
{
GNUNET_free (val);
return;
}
GNUNET_STRINGS_string_to_data (signature_b32,
strlen (signature_b32),
&sig,
sizeof (struct GNUNET_CRYPTO_EcdsaSignature));
if (print_token)
printf ("Signature:\t%s\n",
keystring);
if (GNUNET_OK !=
GNUNET_CRYPTO_ecdsa_verify(GNUNET_SIGNATURE_PURPOSE_GNUID_TOKEN,
purpose,
&sig,
&key))
printf("Signature not OK!\n");
else
printf("Signature OK!\n");
GNUNET_free (val);
return;
}
int
main(int argc, char *const argv[])
{
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_string ('t',
"token",
NULL,
gettext_noop ("GNUid token"),
&token),
GNUNET_GETOPT_option_flag ('p',
"print",
gettext_noop ("Print token contents"),
&print_token),
GNUNET_GETOPT_OPTION_END
};
return GNUNET_PROGRAM_run (argc, argv, "ct",
"ct", options,
&run, NULL);
}
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