mirror of
https://github.com/Yubico/yubikey-val.git
synced 2025-01-20 10:52:15 +01:00
Use time stamp to prevent OTP phishing
This commit is contained in:
Paul Chen
parent
1c9c717efd
commit
150458a5ea
@ -8,6 +8,9 @@ define('S_MISSING_PARAMETER', 'MISSING_PARAMETER');
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//define('S_NO_SUCH_CLIENT', 'NO_SUCH_CLIENT'); // Deprecated by paul 20080920
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define('S_OPERATION_NOT_ALLOWED', 'OPERATION_NOT_ALLOWED');
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define('S_BACKEND_ERROR', 'BACKEND_ERROR');
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define('S_SECURITY_ERROR', 'SECURITY_ERROR');
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define('TS_SEC', 0.1118);
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define('TS_TOLERANCE', 0.3);
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function debug($msg, $exit = false) {
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global $trace;
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146
verifyOTP.php
146
verifyOTP.php
@ -1,10 +1,13 @@
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<?php require_once '../yubiphpbase/appinclude.php';
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require_once '../yubiphpbase/yubi_lib.php';
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require_once 'common.php';
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<?php
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require_once '../yubiphpbase/appinclude.php';
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require_once '../yubiphpbase/yubi_lib.php';
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require_once 'common.php';
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header("content-type: text/plain");
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if (!isset($trace)) { $trace = 0; }
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if (!isset ($trace)) {
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$trace = 0;
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}
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$client = getHttpVal('id', 0);
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if ($client <= 0) {
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@ -28,7 +31,7 @@ $devId = substr($otp, 0, 12);
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$ad = getAuthData($devId);
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if ($ad == null) {
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debug('Invalid Yubikey '.$devId);
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debug('Invalid Yubikey ' . $devId);
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sendResp(S_BAD_OTP, $otp);
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exit;
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} else {
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@ -39,14 +42,14 @@ if ($ad == null) {
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//
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if ($ad['chk_owner'] && $ad['client_id'] != $client) {
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debug('Client-'.$client.' is not the owner of the Yubikey!');
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debug('Client-' . $client . ' is not the owner of the Yubikey!');
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sendResp(S_BAD_CLIENT, 'Not owner of the Yubikey');
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exit;
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}
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$k = b64ToModhex($ad['secret']);
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//debug('aes key in modhex = '.$k);
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$key16 = ModHex::Decode($k);
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$key16 = ModHex :: Decode($k);
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//debug('aes key in hex = ['.$key16.'], length = '.strlen($key16));
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$apiKey = base64_decode($ad['c_secret']);
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@ -54,29 +57,29 @@ $apiKey = base64_decode($ad['c_secret']);
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//
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if ($ad['chk_sig']) {
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// Create the signature using the API key
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$a = array();
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$a['id']=$client;
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$a['otp']=$otp;
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$a = array ();
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$a['id'] = $client;
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$a['otp'] = $otp;
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$hmac = sign($a, $apiKey);
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if (($h = getHttpVal('h', '')) == '') {
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sendResp(S_MISSING_PARAMETER, 'h');
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debug('signature missing, hmac='.$hmac);
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debug('signature missing, hmac=' . $hmac);
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exit;
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} else if ($hmac != $h) {
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} else
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if ($hmac != $h) {
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sendResp(S_BAD_SIGNATURE);
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debug('h='.$h.', hmac='.$hmac);
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debug('h=' . $h . ', hmac=' . $hmac);
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exit;
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}
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}
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//// Decode OTP from input
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//
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debug('From the OTP validation request:');
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$decoded_token = Yubikey::Decode($otp, $key16);
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$decoded_token = Yubikey :: Decode($otp, $key16);
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debug($decoded_token);
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if ( ! is_array($decoded_token) ) {
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if (!is_array($decoded_token)) {
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sendResp(S_BAD_OTP, $otp);
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exit;
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}
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@ -97,18 +100,18 @@ if ($ad['c_active'] < 1) {
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//// Sanity check token ID
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//
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if (strlen($decoded_token["public_id"]) == 12 ) {
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debug("Token ID OK (".$decoded_token["public_id"].")");
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if (strlen($decoded_token["public_id"]) == 12) {
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debug("Token ID OK (" . $decoded_token["public_id"] . ")");
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} else {
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debug("TOKEN ID FAILED, ".$decoded_token["public_id"]);
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debug("TOKEN ID FAILED, " . $decoded_token["public_id"]);
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sendResp(S_BAD_OTP, $otp);
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exit;
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}
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//// Sanity check the OTP
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//
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if ( strlen($decoded_token["token"]) != 32) {
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debug("Wrong OTP length,".strlen($decoded_token["token"]));
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if (strlen($decoded_token["token"]) != 32) {
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debug("Wrong OTP length," . strlen($decoded_token["token"]));
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sendResp(S_BAD_OTP, $otp);
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exit;
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}
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@ -119,38 +122,68 @@ $sessionCounter = $decoded_token["session_counter"]; // From the req
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$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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debug("Replayed session counter=" . $sessionCounter . ', seen=' . $seenSessionCounter);
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sendResp(S_REPLAYED_OTP);
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exit;
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} else {
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debug("Session counter OK (".$sessionCounter.")");
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debug("Session counter OK (" . $sessionCounter . ")");
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}
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//// Check the time stamp
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//
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if ($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=' . $seenTs);
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sendResp(S_REPLAYED_OTP);
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exit;
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} else {
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$tsDelta = $tsDiff * TS_SEC;
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debug("Timestamp OK (" . $ts . ") delta count=".$tsDiff.
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'-> delta secs='.$tsDelta);
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}
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$lastTime = strtotime($ad['accessed']);
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//$lastAccess = $ad['accessed'];
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//echo 'Last accessed: '.$lastAccess.' '.date("F j, Y, g:i a", $lastTime)."\n";
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$elapsed = time() - $lastTime;
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debug('Elapsed time from last validation: '.$elapsed.' secs');
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$deviation = abs($elapsed - $tsDelta);
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debug("Key time deviation vs. real elapsed time=".$deviation.' secs');
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if ($deviation > TS_TOLERANCE * $elapsed) {
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debug("Is the OTP generated from a real crypto key?");
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sendResp(S_SECURITY_ERROR);
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exit;
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}
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}
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//// Check the high counter
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//
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$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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//$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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//$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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@ -166,41 +199,40 @@ if (updDB($ad['id'], $decoded_token, $client)) {
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// Functions
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//////////////////////////
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function sendResp($status, $info=null) {
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function sendResp($status, $info = null) {
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global $ad, $apiKey;
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if ($status == null) {
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$status = S_BACKEND_ERROR;
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}
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echo 'status='.($a['status'] = $status).PHP_EOL;
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echo 'status=' . ($a['status'] = $status) . PHP_EOL;
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if ($info != null) {
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echo 'info='.($a['info'] = $info).PHP_EOL;
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echo 'info=' . ($a['info'] = $info) . PHP_EOL;
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}
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echo 't='.($a['t']=getUTCTimeStamp()).PHP_EOL;
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echo 't=' . ($a['t'] = getUTCTimeStamp()) . PHP_EOL;
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$h = sign($a, $apiKey);
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echo 'h='.$h.PHP_EOL;
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echo 'h=' . $h . PHP_EOL;
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echo PHP_EOL;
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} // End sendResp
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function updDB($keyid, $new, $client) {
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$stmt = 'UPDATE yubikeys SET '.
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'accessed=NOW(),'.
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'counter='.$new['session_counter'].','.
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'low='.$new['low'].','.
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'high='.$new['high'].
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' WHERE id='.$keyid;
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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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'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 '.$stmt;
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$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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addHist(0, $_SERVER['REMOTE_ADDR'] , $keyid, $client);
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addHist(0, $_SERVER['REMOTE_ADDR'], $keyid, $client);
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return true;
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}
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?>
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