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/* SMS based token authentication for ad-hoc GSM networks */
/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <openbsc/signal.h>
#include <openbsc/gsm_data.h>
#include <openbsc/gsm_04_11.h>
#include <openbsc/gsm_04_08.h>
#include <openbsc/gsm_subscriber.h>
#define TOKEN_SMS_TEXT "HAR 2009 GSM. Please visit http://127.0.0.1/ to register"
static int token_subscr_cb(unsigned int subsys, unsigned int signal,
void *handler_data, void *signal_data)
{
struct gsm_subscriber *subscr = signal_data;
struct gsm_sms *sms;
if (subscr->net->auth_policy != GSM_AUTH_POLICY_TOKEN)
return 0;
switch (signal) {
case S_SUBSCR_FIRST_CONTACT:
/* we've seen this subscriber for the first time. */
sms = sms_from_text(subscr, TOKEN_SMS_TEXT);
if (!sms)
return -ENOMEM;
gsm411_send_sms_subscr(subscr, sms);
break;
}
return 0;
}
static int token_sms_cb(unsigned int subsys, unsigned int signal,
void *handler_data, void *signal_data)
{
struct gsm_sms *sms = signal_data;
struct gsm_lchan *lchan;
u_int16_t rand[16];
if (signal != S_SMS_DELIVERED)
return 0;
/* these are not the droids we've been looking for */
if (!sms->receiver ||
!(sms->receiver->flags & GSM_SUBSCRIBER_FIRST_CONTACT))
return 0;
if (sms->receiver->net->auth_policy != GSM_AUTH_POLICY_TOKEN)
return 0;
lchan = lchan_for_subscr(sms->receiver);
if (lchan) {
/* kick the subscriber off the network */
gsm48_tx_mm_auth_req(lchan, rand);
gsm48_tx_mm_auth_rej(lchan);
/* close the channel */
//gsm48_send_rr_Release(lchan);
lchan_free(lchan);
}
/* make sure we don't allow him in again unless he clicks the web UI */
sms->receiver->authorized = 0;
db_sync_subscriber(sms->receiver);
return 0;
}
static __attribute__((constructor)) void on_dso_load_token(void)
{
register_signal_handler(SS_SUBSCR, token_subscr_cb, NULL);
register_signal_handler(SS_SMS, token_sms_cb, NULL);
}
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