public function testCountersEqual()
{
$sl = new SyncLib();
$localParams = array('yk_counter' => 100, 'yk_use' => 10);
$otpParams = array('yk_counter' => 100, 'yk_use' => 10);
$this->assertTrue($sl->countersEqual($otpParams, $localParams));
$otpParams['yk_use'] = 8;
$this->assertFalse($sl->countersEqual($otpParams, $localParams));
$otpParams['yk_use'] = 9;
$this->assertFalse($sl->countersEqual($otpParams, $localParams));
$otpParams['yk_use'] = -11;
$this->assertFalse($sl->countersEqual($otpParams, $localParams));
$otpParams['yk_use'] = 10;
$otpParams['yk_counter'] = 101;
$this->assertFalse($sl->countersEqual($otpParams, $localParams));
}
$myLog->log(LOG_DEBUG, 'Decrypted OTP:', $otpinfo);
// get Yubikey from DB
$yk_publicname = substr($otp, 0, strlen($otp) - TOKEN_LEN);
if (($localParams = $sync->getLocalParams($yk_publicname)) === FALSE) {
$myLog->log(LOG_NOTICE, "Invalid Yubikey {$yk_publicname}");
sendResp(S_BACKEND_ERROR, $myLog, $apiKey);
}
$myLog->log(LOG_DEBUG, 'Auth data:', $localParams);
if ($localParams['active'] != 1) {
$myLog->log(LOG_NOTICE, "De-activated Yubikey {$yk_publicname}");
sendResp(S_BAD_OTP, $myLog, $apiKey);
}
/* Build OTP params */
$otpParams = array('modified' => time(), 'otp' => $otp, 'nonce' => $nonce, 'yk_publicname' => $yk_publicname, 'yk_counter' => $otpinfo['session_counter'], 'yk_use' => $otpinfo['session_use'], 'yk_high' => $otpinfo['high'], 'yk_low' => $otpinfo['low']);
/* First check if OTP is seen with the same nonce, in such case we have an replayed request */
if ($sync->countersEqual($localParams, $otpParams) && $localParams['nonce'] == $otpParams['nonce']) {
$myLog->log(LOG_WARNING, 'Replayed request');
sendResp(S_REPLAYED_REQUEST, $myLog, $apiKey, $extra);
}
/* Check the OTP counters against local db */
if ($sync->countersHigherThanOrEqual($localParams, $otpParams)) {
$sync->log(LOG_WARNING, 'replayed OTP: Local counters higher');
$sync->log(LOG_WARNING, 'replayed OTP: Local counters ', $localParams);
$sync->log(LOG_WARNING, 'replayed OTP: Otp counters ', $otpParams);
sendResp(S_REPLAYED_OTP, $myLog, $apiKey, $extra);
}
/* Valid OTP, update database. */
if (!$sync->updateDbCounters($otpParams)) {
$myLog->log(LOG_CRIT, 'Failed to update yubikey counters in database');
sendResp(S_BACKEND_ERROR, $myLog, $apiKey);
}
if ($localParams['active'] != 1) {
$myLog->log(LOG_NOTICE, 'De-activated Yubikey ' . $yk_publicname);
sendResp(S_BAD_OTP, $apiKey);
exit;
}
/* Conditional update local database */
$sync->updateDbCounters($syncParams);
$myLog->log(LOG_DEBUG, 'Local params ', $localParams);
$myLog->log(LOG_DEBUG, 'Sync request params ', $syncParams);
#
# Compare sync and local counters and generate warnings according to
#
# http://code.google.com/p/yubikey-val-server-php/wiki/ServerReplicationProtocol
#
if ($sync->countersHigherThan($localParams, $syncParams)) {
$myLog->log(LOG_WARNING, 'Remote server out of sync.');
}
if ($sync->countersEqual($localParams, $syncParams)) {
if ($syncParams['modified'] == $localParams['modified'] && $syncParams['nonce'] == $localParams['nonce']) {
$myLog->log(LOG_NOTICE, 'Sync request unnessecarily sent');
}
if ($syncParams['modified'] != $localParams['modified'] && $syncParams['nonce'] == $localParams['nonce']) {
$deltaModified = $syncParams['modified'] - $localParams['modified'];
$myLog->log(LOG_WARNING, 'We might have a replay. 2 events at different times have generated the same counters. The time difference is ' . $deltaModified . ' seconds');
}
if ($syncParams['nonce'] != $localParams['nonce']) {
$myLog->log(LOG_WARNING, 'Remote server has received a request to validate an already validated OTP ');
}
}
$extra = array('modified' => $localParams['modified'], 'nonce' => $localParams['nonce'], 'yk_publicname' => $yk_publicname, 'yk_counter' => $localParams['yk_counter'], 'yk_use' => $localParams['yk_use'], 'yk_high' => $localParams['yk_high'], 'yk_low' => $localParams['yk_low']);
sendResp(S_OK, '', $extra);
