93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
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/* SMS based token authentication for ad-hoc GSM networks */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <openbsc/signal.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/gsm_04_11.h>
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#include <openbsc/gsm_04_08.h>
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#include <openbsc/gsm_subscriber.h>
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#define TOKEN_SMS_TEXT "HAR 2009 GSM. Please visit http://127.0.0.1/ to register"
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static int token_subscr_cb(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct gsm_subscriber *subscr = signal_data;
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struct gsm_sms *sms;
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if (subscr->net->auth_policy != GSM_AUTH_POLICY_TOKEN)
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return 0;
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switch (signal) {
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case S_SUBSCR_FIRST_CONTACT:
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/* we've seen this subscriber for the first time. */
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sms = sms_from_text(subscr, TOKEN_SMS_TEXT);
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if (!sms)
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return -ENOMEM;
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gsm411_send_sms_subscr(subscr, sms);
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break;
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}
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return 0;
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}
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static int token_sms_cb(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct gsm_sms *sms = signal_data;
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struct gsm_lchan *lchan;
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u_int16_t rand[16];
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if (signal != S_SMS_DELIVERED)
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return 0;
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/* these are not the droids we've been looking for */
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if (!sms->receiver ||
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!(sms->receiver->flags & GSM_SUBSCRIBER_FIRST_CONTACT))
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return 0;
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if (sms->receiver->net->auth_policy != GSM_AUTH_POLICY_TOKEN)
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return 0;
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lchan = lchan_for_subscr(sms->receiver);
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if (lchan) {
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/* kick the subscriber off the network */
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gsm48_tx_mm_auth_req(lchan, rand);
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gsm48_tx_mm_auth_rej(lchan);
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/* close the channel */
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//gsm48_send_rr_Release(lchan);
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lchan_free(lchan);
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}
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/* make sure we don't allow him in again unless he clicks the web UI */
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sms->receiver->authorized = 0;
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db_sync_subscriber(sms->receiver);
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return 0;
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}
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static __attribute__((constructor)) void on_dso_load_token(void)
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{
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register_signal_handler(SS_SUBSCR, token_subscr_cb, NULL);
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register_signal_handler(SS_SMS, token_sms_cb, NULL);
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}
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