mirror of
https://github.com/Yubico/yubikey-val.git
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resp mesgs
This commit is contained in:
Paul Chen
parent
14808c0952
commit
c9e5de4d7b
154
verifyOTP.php
154
verifyOTP.php
@ -1,17 +1,31 @@
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<?php require_once '../yms/appinclude.php';
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require_once '../yms/yubi_lib.php';
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define('S_OK', 'OK');
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define('S_BAD_OTP', 'BAD_OTP');
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define('S_BAD_CLIENT', 'BAD_CLIENT'); // New, added by paul 20080920
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define('S_REPLAYED_OTP', 'REPLAYED_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'); // 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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header("content-type: text/plain");
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if (!isset($trace)) { $trace = 0; }
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$id = getHttpVal('id', 0);
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if ($id <= 0) {
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echo 'Client ID is missing';
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$client = getHttpVal('id', 0);
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if ($client <= 0) {
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debug('Client ID is missing');
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sendResp(S_MISSING_PARAMETER, 'id');
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exit;
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}
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$otp = getHttpVal('otp', '');
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if ($otp == '') {
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echo 'OTP is missing';
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debug('OTP is missing');
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sendResp(S_MISSING_PARAMETER, 'otp');
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exit;
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}
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@ -19,15 +33,24 @@ if ($otp == '') {
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//
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$devId = substr($otp, 0, 12);
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$ad = getAuthData($devId);
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debug('<h3>Auth Data from DB</h3>');
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debug('Auth Data from DB:');
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if ($ad == null) {
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echo 'Invalid Yubikey '.$devId;
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debug('Invalid Yubikey '.$devId);
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sendResp(S_BAD_OTP, $otp);
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exit;
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} else {
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debug($ad);
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}
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//// Check the client ID
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//
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if ($ad['client_id'] != $client) {
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debug('Client-'.$client.' is not the owner of the Yubikey! The key will be suspended with excessive failed attempts.');
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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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@ -35,102 +58,167 @@ $key16 = ModHex::Decode($k);
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//// Decode OTP from input
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//
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debug('<h3>From OTP decoded</h3>');
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debug('From the OTP validation request:');
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$decoded_token = Yubikey::Decode($otp, $key16);
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debug($decoded_token);
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if ( ! is_array($decoded_token) ) {
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die ('DECODING FAILED: '.$decoded_token."\n");
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sendResp(S_BAD_OTP, $otp);
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exit;
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}
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//// Sanity check key status
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//
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if ($ad['active'] < 1) {
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die ('The Yubikey is not activated!');
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sendResp(S_BAD_OTP, 'Suspended Yubikey');
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exit;
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}
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// Sanity check client status
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//// Sanity check client status
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//
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if ($ad['c_active'] < 1) {
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die ('The Client is not activated!');
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sendResp(S_BAD_CLIENT, 'Suspended client');
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exit;
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}
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// Sanity check token ID
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//// Sanity check token ID
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//
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if (strlen($decoded_token["public_id"]) == 12 ) {
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debug("Token ID OK (".$decoded_token["public_id"].")");
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} else { die("TOKEN ID FAILED, ".$decoded_token["public_id"]); }
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// Sanity check the OTP
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//
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if ( strlen($decoded_token["token"]) != 32) {
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die("Wrong OTP length,".strlen($decoded_token["token"]));
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} else {
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debug("TOKEN ID FAILED, ".$decoded_token["public_id"]);
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sendResp(S_BAD_OTP, $otp);
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exit;
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}
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// Check the session counter
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//// Sanity check the OTP
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//
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if ( strlen($decoded_token["token"]) != 32) {
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debug("Wrong OTP length,".strlen($decoded_token["token"]));
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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 = $decoded_token["session_counter"]; // From the req
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$seenSessionCounter = $ad['counter']; // From DB
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$scDiff = $seenSessionCounter - $sessionCounter;
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if ($scDiff > 0) {
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die("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, 'session counter');
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exit;
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} else {
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debug("Session counter OK (".$sessionCounter.")");
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}
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//// Check the high counter
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//
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$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 && $hiDiff > 0) {
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die("Replayed high counter=".$hi.', seen='.$seenHi);
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debug("Replayed hi counter=".$hi.', seen='.$seenHi);
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sendResp(S_REPLAYED_OTP, 'hi counter');
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exit;
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} else {
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debug("High counter OK (".$hi.")");
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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 && $loDiff >= 0) {
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die("Replayed low counter=".$lo.', seen='.$seenLo);
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debug("Replayed low counter=".$lo.', seen='.$seenLo);
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sendResp(S_REPLAYED_OTP, 'lo counter');
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exit;
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} else {
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debug("Low counter OK (".$lo.")");
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debug("Lo counter OK (".$lo.")");
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}
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echo 'Validation OK for Yubikey: '.$decoded_token["public_id"];
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//// Update the DB only upon validation success
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//
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if (updDB($ad['id'], $decoded_token)) {
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debug('Validation database updated');
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sendResp(S_OK);
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} else {
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debug('Failed to update validation database');
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sendResp(S_BACKEND_ERROR);
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}
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//////////////////////////
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// Functions
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//////////////////////////
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function sendResp($status, $info=null) {
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global $ad;
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if ($status == null) {
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$status = S_BACKEND_ERROR;
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}
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date_default_timezone_set('UTC');
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$timestamp = date('Y-m-d\TH:i:s\ZZ', time());
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//// Prepare the response to the user
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//
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$respParams = 'status='.$status.'&t='.$timestamp;
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// Generate the signature
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debug('API key: '.$ad['c_secret']); // API key of the client
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$apiKey = base64_decode($ad['c_secret']);
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debug('Signing: '.$respParams);
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// the TRUE at the end states we want the raw value, not hexadecimal form
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$hmac = hash_hmac('sha1', utf8_encode($respParams), $apiKey, true);
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//outputToFile('hmac', $hmac, "b");
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// now take that byte value and base64 encode it
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$hmac = base64_encode($hmac);
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debug('h: '.$hmac);
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echo 'h='.$hmac.PHP_EOL;
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echo 't='.$timestamp.PHP_EOL;
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if ($info != null) {
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echo 'info='.$info.PHP_EOL;
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}
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echo 'status='.$status.PHP_EOL.PHP_EOL;
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} // End sendResp
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function debug($msg, $exit=false) {
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global $trace;
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if ($trace) {
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if (is_array($msg)) {
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echo '<pre>';
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print_r($msg);
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echo '</pre>';
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} else {
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echo $msg;
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echo 'debug> '.$msg;
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}
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echo "<p>\n";
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echo "\n";
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}
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if ($exit) {
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die ('<font color=red><h4>Exit</h4></font>');
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}
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}
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function updDB($id, $new) {
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function updDB($keyid, $new) {
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$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='.$new['high'].
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' WHERE id='.$id;
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' WHERE id='.$keyid;
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if (!query($stmt)) {
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$err = 'Failed to update validation data of key: '.$id.' 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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return true;
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}
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function outputToFile($outFname, $content, $mode, $append=false) {
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$out = fopen($outFname, ($append ? "a" : "w"));
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fwrite($out, $content);
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fclose($out);
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}
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?>
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