mirror of
https://github.com/Yubico/yubikey-val.git
synced 2024-11-29 09:24:12 +01:00
Improve checking of OTPs.
This commit is contained in:
Simon Josefsson
parent
ede3f44960
commit
0fd6a2b7d0
16
common.php
16
common.php
@ -2,7 +2,7 @@
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define('S_OK', 'OK');
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define('S_BAD_OTP', 'BAD_OTP');
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define('S_REPLAYED_OTP', 'REPLAYED_OTP');
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define('S_PHISHED_OTP', 'PHISHED_OTP');
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define('S_DELAYED_OTP', 'DELAYED_OTP');
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define('S_BAD_SIGNATURE', 'BAD_SIGNATURE');
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define('S_MISSING_PARAMETER', 'MISSING_PARAMETER');
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define('S_NO_SUCH_CLIENT', 'NO_SUCH_CLIENT');
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@ -54,6 +54,7 @@ mysql_select_db($baseParams['__DB_NAME__'], $conn)
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function query($q) {
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global $conn;
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debug('Query: '.$q);
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$result = mysql_query($q, $conn);
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if (!$result) {
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$err = "Invalid query -- $q -- ";
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@ -67,19 +68,18 @@ function mysql_quote($value) {
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return "'" . mysql_real_escape_string($value) . "'";
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}
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function truncate($s, $max) {
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return (strlen($s) > $max) ? substr($s, 0, $max-3).'...' : $s;
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}
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function debug($msg, $exit = false) {
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global $trace;
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if ($trace) {
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if (is_array($msg)) {
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//print_r($msg);
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$str = "";
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foreach($msg as $key => $value){
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$str .= " $key=$value";
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}
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} else {
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echo '<p>Debug> ' . $msg;
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$str = ' ' . $msg;
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}
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echo "\n";
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echo '<p>Debug>' . $str . "\n";
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}
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if ($exit) {
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die('<font color=red><h4>Exit</h4></font>');
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152
verify.php
152
verify.php
@ -80,112 +80,77 @@ $key16 = ModHex :: Decode($k);
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//// Decode OTP from input
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//
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debug('OTP validation req:');
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$decoded_token = Yubikey :: Decode($otp, $key16);
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debug($decoded_token);
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if (!is_array($decoded_token)) {
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$otpinfo = Yubikey :: Decode($otp, $key16);
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debug($otpinfo);
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if (!is_array($otpinfo)) {
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sendResp(S_BAD_OTP, $otp);
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exit;
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}
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//// Check the session counter
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//
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$sessionCounter = $decoded_token["session_counter"]; // From the req
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$sessionCounter = $otpinfo["session_counter"]; // From the req
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$seenSessionCounter = $ad['counter']; // From DB
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$scDiff = $seenSessionCounter - $sessionCounter;
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if ($scDiff > 0) {
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debug("Replayed session counter=" . $sessionCounter . ', seen=' . $seenSessionCounter);
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if ($sessionCounter < $seenSessionCounter) {
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debug("Replay, session counter, seen=" . $seenSessionCounter .
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" this=" . $sessionCounter);
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sendResp(S_REPLAYED_OTP);
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exit;
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} else {
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debug("Session counter OK (" . $sessionCounter . ")");
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debug("Session counter OK, seen=" . $seenSessionCounter .
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" this=" . $sessionCounter);
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}
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//// Check the session use
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//
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$sessionUse = $decoded_token["session_use"]; // From the req
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$sessionUse = $otpinfo["session_use"]; // From the req
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$seenSessionUse = $ad['sessionUse']; // From DB
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$sucDiff = $seenSessionUse - $sessionUse;
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if ($sucDiff > 0) {
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debug("Replayed session use=" . $sessionUse . ', seen=' . $seenSessionUse);
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if ($sessionCounter == $seenSessionCounter && $sessionUse <= $seenSessionUse) {
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debug("Replay, session use, seen=" . $seenSessionUse .
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' this=' . $sessionUse);
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sendResp(S_REPLAYED_OTP);
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exit;
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} else {
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debug("Session counter OK (" . $sessionCounter . ")");
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debug("Session use OK, seen=" . $seenSessionUse .
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' this=' . $sessionUse);
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}
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updateDB($ad['id'], $otpinfo['session_counter'], $otpinfo['session_use'],
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$otpinfo['high'], $otpinfo['low']);
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//// Check the time stamp
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//
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if ($scDiff == 0) { // Same use session, check time stamp diff
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$ts = $decoded_token['timestamp'];
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$seenTs = ($ad['high'] << 16) + $ad['low'];
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$tsDiff = $ts - $seenTs;
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if ($tsDiff <= 0) {
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debug("Replayed time stamp=" . $ts . ', seen=' . $seenTs);
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sendResp(S_REPLAYED_OTP);
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exit;
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} else {
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updDB($ad['id'], $decoded_token, $client);
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$tsDelta = $tsDiff * TS_SEC;
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debug("Timestamp OK (" . $ts . ") delta count=" . $tsDiff .
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'-> delta secs=' . $tsDelta);
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}
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if ($sessionCounter == $seenSessionCounter && $sessionUse > $seenSessionUse) {
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$ts = $otpinfo['timestamp'];
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$seenTs = ($ad['high'] << 16) + $ad['low'];
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$tsDiff = $ts - $seenTs;
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$tsDelta = $tsDiff * TS_SEC;
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//// Check the real time
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//
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if ($ad['chk_time']) {
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$lastTime = strtotime($ad['accessed']);
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debug('Last accessed: '.$ad['accessed'].', '.$lastTime.', '.date("F j, Y, g:i a", $lastTime));
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$elapsed = time() - $lastTime;
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debug('Elapsed time from last validation: ' . $elapsed . ' secs');
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$deviation = abs($elapsed - $tsDelta);
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$percent = truncate(100*$deviation/$elapsed, 8) . '%';
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debug("Key time deviation vs. elapsed time=".$deviation.' secs ('.
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$percent.')');
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if ($deviation > TS_TOLERANCE * $elapsed) {
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debug("Is the OTP generated from a real crypto key?");
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sendResp(S_PHISHED_OTP);
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exit;
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}
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}
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} // End check time stamp
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//// Check the high counter
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//
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//$hi = $decoded_token["high"]; // From the req
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//$seenHi = $ad['high']; // From DB
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//$hiDiff = $seenHi - $hi;
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//if ($scDiff == 0 && $hiDiff > 0) {
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// debug("Replayed hi counter=".$hi.', seen='.$seenHi);
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// sendResp(S_REPLAYED_OTP);
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// exit;
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//} else {
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// debug("Hi counter OK (".$hi.")");
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//}
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//// Check the low counter
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//
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//$lo = $decoded_token["low"]; // From the req
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//$seenLo = $ad['low']; // From DB
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//$loDiff = $seenLo - $lo;
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//if ($scDiff == 0 && $hiDiff == 0 && $loDiff >= 0) {
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// debug("Replayed low counter=".$lo.', seen='.$seenLo);
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// sendResp(S_REPLAYED_OTP);
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// exit;
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//} else {
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// debug("Lo counter OK (".$lo.")");
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//}
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//// Update the DB only upon validation success
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//
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if (updDB($ad['id'], $decoded_token, $client)) {
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debug('Validation database updated');
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sendResp(S_OK);
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} else {
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debug('Failed to update validation database');
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sendResp(S_BACKEND_ERROR);
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//// Check the real time
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//
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$lastTime = strtotime($ad['accessed']);
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$now = time();
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$elapsed = $now - $lastTime;
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$deviation = abs($elapsed - $tsDelta);
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$percent = round(100*$deviation/$elapsed);
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debug("Timestamp seen=" . $seenTs . " this=" . $ts .
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" delta=" . $tsDiff . ' secs=' . $tsDelta .
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' accessed=' . $lastTime .' (' . $ad['accessed'] . ') now='
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. $now . ' (' . strftime("%Y-%m-%d %H:%M:%S", $now)
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. ') elapsed=' . $elapsed .
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' deviation=' . $deviation . ' secs or '.
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$percent . '%');
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if ($deviation > TS_TOLERANCE * $elapsed) {
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debug("OTP failed phishing test");
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if ($ad['chk_time']) {
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sendResp(S_DELAYED_OTP);
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exit;
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}
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}
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}
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sendResp(S_OK);
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//////////////////////////
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// Functions
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//////////////////////////
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@ -212,21 +177,14 @@ function sendResp($status, $info = null) {
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} // End sendResp
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function updDB($keyid, $new, $client) {
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$stmt = 'UPDATE yubikeys SET ' .
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'accessed=NOW(),' .
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'counter=' . $new['session_counter'] . ',' .
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'sessionUse=' . $new['session_use'] . ',' .
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'low=' . $new['low'] . ',' .
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'high=' . $new['high'] .
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' WHERE id=' . $keyid;
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if (!query($stmt)) {
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$err = 'Failed to update validation data of key: ' . $keyid . ' by ' . $stmt;
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debug($err);
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writeLog($err);
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return false;
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}
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return true;
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function updateDB($id, $session_counter, $session_use, $ts_high, $ts_low) {
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$stmt = 'UPDATE yubikeys SET ' .
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'accessed=NOW(),' .
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'counter=' . $session_counter . ',' .
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'sessionUse=' . $session_use . ',' .
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'low=' . $ts_low . ',' .
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'high=' . $ts_high .
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' WHERE id=' . $id;
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query($stmt);
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}
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?>
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