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/*
* Copyright (c) 2008-2010 Moxie Marlinspike
*
* 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 3 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <stdint.h>
#include "HOTPWindow.h"
#include "HOTP.h"
#include "HOTPCredentials.h"
#include <security/pam_modules.h>
#include <security/pam_ext.h>
#include <syslog.h>
#undef DEBUG
HOTPWindow::HOTPWindow(const pam_handle_t *pamh, int windowSize, HOTPCredentials &credentials) {
this->pamh = pamh;
this->windowSize = windowSize;
this->key = credentials.getKey();
this->keyLength = credentials.getKeyLength();
this->counter = credentials.getCounter();
this->pin = credentials.getPin();
}
uint64_t HOTPWindow::verify(uint32_t remoteOtp) {
int i;
for (i=0;i<windowSize;i++) {
HOTP localOtp(pamh, key, keyLength, counter+i, pin);
#ifdef DEBUG
pam_syslog(pamh, LOG_EMERG, "Counter: %d, Given OTP: %d -- Computed OTP: %d",
counter+i, remoteOtp, localOtp.getOneTimePasscode());
#endif
if (localOtp.getOneTimePasscode() == remoteOtp) {
return counter+i;
}
}
return 0;
}
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