· 9 years ago · Mar 07, 2017, 01:50 PM
1<?php
2/*
3Plugin Name: Google Authenticator
4Plugin URI: http://henrik.schack.dk/google-authenticator-for-wordpress
5Description: Two-Factor Authentication for WordPress using the Android/iPhone/Blackberry app as One Time Password generator.
6Author: Henrik Schack
7Version: 0.48
8Author URI: http://henrik.schack.dk/
9Compatibility: WordPress 4.5
10Text Domain: google-authenticator
11Domain Path: /lang
12
13----------------------------------------------------------------------------
14
15 Thanks to Bryan Ruiz for his Base32 encode/decode class, found at php.net.
16 Thanks to Tobias Bäthge for his major code rewrite and German translation.
17 Thanks to Pascal de Bruijn for his relaxed mode idea.
18 Thanks to Daniel Werl for his usability tips.
19 Thanks to Dion Hulse for his bugfixes.
20 Thanks to Aldo Latino for his Italian translation.
21 Thanks to Kaijia Feng for his Simplified Chinese translation.
22 Thanks to Ian Dunn for fixing some depricated function calls.
23 Thanks to Kimmo Suominen for fixing the iPhone description issue.
24 Thanks to Alex Concha for some security tips.
25 Thanks to Sébastien Prunier for his Spanish and French translations.
26
27----------------------------------------------------------------------------
28
29 Copyright 2013 Henrik Schack (email : henrik@schack.dk)
30
31 This program is free software; you can redistribute it and/or modify
32 it under the terms of the GNU General Public License as published by
33 the Free Software Foundation; either version 2 of the License, or
34 (at your option) any later version.
35
36 This program is distributed in the hope that it will be useful,
37 but WITHOUT ANY WARRANTY; without even the implied warranty of
38 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
39 GNU General Public License for more details.
40
41 You should have received a copy of the GNU General Public License
42 along with this program; if not, write to the Free Software
43 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
44*/
45
46class GoogleAuthenticator {
47
48static $instance; // to store a reference to the plugin, allows other plugins to remove actions
49
50/**
51 * Constructor, entry point of the plugin
52 */
53function __construct() {
54 self::$instance = $this;
55 add_action( 'init', array( $this, 'init' ) );
56}
57
58/**
59 * Initialization, Hooks, and localization
60 */
61function init() {
62 require_once( 'base32.php' );
63
64 add_action( 'login_form', array( $this, 'loginform' ) );
65 add_action( 'login_footer', array( $this, 'loginfooter' ) );
66 add_filter( 'authenticate', array( $this, 'check_otp' ), 50, 3 );
67
68 if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
69 add_action( 'wp_ajax_GoogleAuthenticator_action', array( $this, 'ajax_callback' ) );
70 }
71
72 add_action( 'personal_options_update', array( $this, 'personal_options_update' ) );
73 add_action( 'profile_personal_options', array( $this, 'profile_personal_options' ) );
74 add_action( 'edit_user_profile', array( $this, 'edit_user_profile' ) );
75 add_action( 'edit_user_profile_update', array( $this, 'edit_user_profile_update' ) );
76
77 add_action('admin_enqueue_scripts', array($this, 'add_qrcode_script'));
78
79 load_plugin_textdomain( 'google-authenticator', false, basename( dirname( __FILE__ ) ) . '/lang' );
80}
81
82
83/**
84 * Check the verification code entered by the user.
85 */
86function verify( $secretkey, $thistry, $relaxedmode, $lasttimeslot ) {
87
88 // Did the user enter 6 digits ?
89 if ( strlen( $thistry ) != 6) {
90 return false;
91 } else {
92 $thistry = intval ( $thistry );
93 }
94
95 // If user is running in relaxed mode, we allow more time drifting
96 // ±4 min, as opposed to ± 30 seconds in normal mode.
97 if ( $relaxedmode == 'enabled' ) {
98 $firstcount = -8;
99 $lastcount = 8;
100 } else {
101 $firstcount = -1;
102 $lastcount = 1;
103 }
104
105 $tm = floor( time() / 30 );
106
107 $secretkey=Base32::decode($secretkey);
108 // Keys from 30 seconds before and after are valid aswell.
109 for ($i=$firstcount; $i<=$lastcount; $i++) {
110 // Pack time into binary string
111 $time=chr(0).chr(0).chr(0).chr(0).pack('N*',$tm+$i);
112 // Hash it with users secret key
113 $hm = hash_hmac( 'SHA1', $time, $secretkey, true );
114 // Use last nipple of result as index/offset
115 $offset = ord(substr($hm,-1)) & 0x0F;
116 // grab 4 bytes of the result
117 $hashpart=substr($hm,$offset,4);
118 // Unpak binary value
119 $value=unpack("N",$hashpart);
120 $value=$value[1];
121 // Only 32 bits
122 $value = $value & 0x7FFFFFFF;
123 $value = $value % 1000000;
124 if ( $value === $thistry ) {
125 // Check for replay (Man-in-the-middle) attack.
126 // Since this is not Star Trek, time can only move forward,
127 // meaning current login attempt has to be in the future compared to
128 // last successful login.
129 if ( $lasttimeslot >= ($tm+$i) ) {
130 error_log("Google Authenticator plugin: Man-in-the-middle attack detected (Could also be 2 legit login attempts within the same 30 second period)");
131 return false;
132 }
133 // Return timeslot in which login happened.
134 return $tm+$i;
135 }
136 }
137 return false;
138}
139
140/**
141 * Create a new random secret for the Google Authenticator app.
142 * 16 characters, randomly chosen from the allowed Base32 characters
143 * equals 10 bytes = 80 bits, as 256^10 = 32^16 = 2^80
144 */
145function create_secret() {
146 $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'; // allowed characters in Base32
147 $secret = '';
148 for ( $i = 0; $i < 16; $i++ ) {
149 $secret .= substr( $chars, wp_rand( 0, strlen( $chars ) - 1 ), 1 );
150 }
151 return $secret;
152}
153
154/**
155 * Add the script to generate QR codes.
156 */
157function add_qrcode_script() {
158 wp_enqueue_script('jquery');
159 wp_register_script('qrcode_script', plugins_url('jquery.qrcode.min.js', __FILE__),array("jquery"));
160 wp_enqueue_script('qrcode_script');
161}
162
163/**
164 * Add verification code field to login form.
165 */
166function loginform() {
167 echo "\t<p>\n";
168 echo "\t\t<label title=\"".__('If you don\'t have Google Authenticator enabled for your CryptoMerian account, leave this field empty.','google-authenticator')."\">".__('Google Authenticator code','google-authenticator')."<span id=\"google-auth-info\"></span><br />\n";
169 echo "\t\t<input type=\"text\" name=\"googleotp\" id=\"user_email\" class=\"input\" value=\"\" size=\"20\" style=\"ime-mode: inactive;\" /></label>\n";
170 echo "\t</p>\n";
171}
172
173/**
174 * Disable autocomplete on Google Authenticator code input field.
175 */
176function loginfooter() {
177 echo "\n<script type=\"text/javascript\">\n";
178 echo "\ttry{\n";
179 echo "\t\tdocument.getElementById('user_email').setAttribute('autocomplete','off');\n";
180 echo "\t} catch(e){}\n";
181 echo "</script>\n";
182}
183
184/**
185 * Login form handling.
186 * Check Google Authenticator verification code, if user has been setup to do so.
187 * @param wordpressuser
188 * @return user/loginstatus
189 */
190function check_otp( $user, $username = '', $password = '' ) {
191 // Store result of loginprocess, so far.
192 $userstate = $user;
193
194 // Get information on user, we need this in case an app password has been enabled,
195 // since the $user var only contain an error at this point in the login flow.
196 if ( get_user_by( 'email', $username ) === false ) {
197 $user = get_user_by( 'login', $username );
198 } else {
199 $user = get_user_by( 'email', $username );
200 }
201
202 // Does the user have the Google Authenticator enabled ?
203 if ( isset( $user->ID ) && trim(get_user_option( 'googleauthenticator_enabled', $user->ID ) ) == 'enabled' ) {
204
205 // Get the users secret
206 $GA_secret = trim( get_user_option( 'googleauthenticator_secret', $user->ID ) );
207
208 // Figure out if user is using relaxed mode ?
209 $GA_relaxedmode = trim( get_user_option( 'googleauthenticator_relaxedmode', $user->ID ) );
210
211 // Get the verification code entered by the user trying to login
212 if ( !empty( $_POST['googleotp'] )) { // Prevent PHP notices when using app password login
213 $otp = trim( $_POST[ 'googleotp' ] );
214 } else {
215 $otp = '';
216 }
217 // When was the last successful login performed ?
218 $lasttimeslot = trim( get_user_option( 'googleauthenticator_lasttimeslot', $user->ID ) );
219 // Valid code ?
220 if ( $timeslot = $this->verify( $GA_secret, $otp, $GA_relaxedmode, $lasttimeslot ) ) {
221 // Store the timeslot in which login was successful.
222 update_user_option( $user->ID, 'googleauthenticator_lasttimeslot', $timeslot, true );
223 return $userstate;
224 } else {
225 // No, lets see if an app password is enabled, and this is an XMLRPC / APP login ?
226 if ( trim( get_user_option( 'googleauthenticator_pwdenabled', $user->ID ) ) == 'enabled' && ( defined('XMLRPC_REQUEST') || defined('APP_REQUEST') ) ) {
227 $GA_passwords = json_decode( get_user_option( 'googleauthenticator_passwords', $user->ID ) );
228 $passwordhash = trim($GA_passwords->{'password'} );
229 $usersha1 = sha1( strtoupper( str_replace( ' ', '', $password ) ) );
230 if ( $passwordhash == $usersha1 ) { // ToDo: Remove after some time when users have migrated to new format
231 return new WP_User( $user->ID );
232 // Try the new version based on thee wp_hash_password function
233 } elseif (wp_check_password( strtoupper( str_replace( ' ', '', $password ) ), $passwordhash)) {
234 return new WP_User( $user->ID );
235 } else {
236 // Wrong XMLRPC/APP password !
237 return new WP_Error( 'invalid_google_authenticator_password', __( '<strong>ERROR</strong>: The Google Authenticator password is incorrect.', 'google-authenticator' ) );
238 }
239 } else {
240 return new WP_Error( 'invalid_google_authenticator_token', __( '<strong>ERROR</strong>: The Google Authenticator code is incorrect or has expired.', 'google-authenticator' ) );
241 }
242 }
243 }
244 // Google Authenticator isn't enabled for this account,
245 // just resume normal authentication.
246 return $userstate;
247}
248
249
250/**
251 * Extend personal profile page with Google Authenticator settings.
252 */
253function profile_personal_options() {
254 global $user_id, $is_profile_page;
255 global $user_email;
256 get_currentuserinfo();
257
258 // If editing of Google Authenticator settings has been disabled, just return
259 $GA_hidefromuser = trim( get_user_option( 'googleauthenticator_hidefromuser', $user_id ) );
260 if ( $GA_hidefromuser == 'enabled') return;
261
262 $GA_secret = trim( get_user_option( 'googleauthenticator_secret', $user_id ) );
263 $GA_enabled = trim( get_user_option( 'googleauthenticator_enabled', $user_id ) );
264 $GA_relaxedmode = trim( get_user_option( 'googleauthenticator_relaxedmode', $user_id ) );
265 $GA_description = trim( get_user_option( 'googleauthenticator_description', $user_id ) );
266 $GA_pwdenabled = trim( get_user_option( 'googleauthenticator_pwdenabled', $user_id ) );
267 $GA_password = trim( get_user_option( 'googleauthenticator_passwords', $user_id ) );
268
269 // We dont store the generated app password in cleartext so there is no point in trying
270 // to show the user anything except from the fact that a password exists.
271 if ( $GA_password != '' ) {
272 $GA_password = "XXXX XXXX XXXX XXXX";
273 }
274
275 // In case the user has no secret ready (new install), we create one.
276 if ( '' == $GA_secret ) {
277 $GA_secret = $this->create_secret();
278 }
279
280 // Use "WordPress Blog" as default description
281 if ( '' == $GA_description ) {
282 $GA_description = __( $user_email , 'google-authenticator' );
283 }
284
285 echo "<h3>".__( 'Google Authenticator Settings', 'google-authenticator' )."</h3>\n";
286
287 echo "<table class=\"form-table\">\n";
288 echo "<tbody>\n";
289 echo "<tr>\n";
290 echo "<th scope=\"row\">".__( 'Active', 'google-authenticator' )."</th>\n";
291 echo "<td>\n";
292 echo "<input name=\"GA_enabled\" id=\"GA_enabled\" class=\"tog\" type=\"checkbox\"" . checked( $GA_enabled, 'enabled', false ) . "/>\n";
293 echo "</td>\n";
294 echo "</tr>\n";
295
296 if ( $is_profile_page || IS_PROFILE_PAGE ) {
297 echo "<tr>\n";
298 echo "<th scope=\"row\">".__( 'Relaxed mode', 'google-authenticator' )."</th>\n";
299 echo "<td>\n";
300 echo "<input name=\"GA_relaxedmode\" id=\"GA_relaxedmode\" class=\"tog\" type=\"checkbox\"" . checked( $GA_relaxedmode, 'enabled', false ) . "/><span class=\"description\">".__(' Relaxed mode allows for more time drifting on your phone clock (±4 min).','google-authenticator')."</span>\n";
301 echo "</td>\n";
302 echo "</tr>\n";
303
304 echo "<tr>\n";
305 echo "<th><label for=\"GA_description\">".__('Description','google-authenticator')."</label></th>\n";
306 echo "<td><input name=\"GA_description\" id=\"GA_description\" value=\"{$GA_description}\" type=\"text\" size=\"25\" /><span class=\"description\">".__(' Description that you\'ll see in the Google Authenticator app on your phone.','google-authenticator')."</span><br /></td>\n";
307 echo "</tr>\n";
308
309 echo "<tr>\n";
310 echo "<th><label for=\"GA_secret\">".__('Secret','google-authenticator')."</label></th>\n";
311 echo "<td>\n";
312 echo "<input name=\"GA_secret\" id=\"GA_secret\" value=\"{$GA_secret}\" readonly=\"readonly\" type=\"text\" size=\"25\" />";
313 echo "<input name=\"GA_newsecret\" id=\"GA_newsecret\" value=\"".__("Create new secret",'google-authenticator')."\" type=\"button\" class=\"button\" />";
314 echo "<input name=\"show_qr\" id=\"show_qr\" value=\"".__("Show/Hide QR code",'google-authenticator')."\" type=\"button\" class=\"button\" onclick=\"ShowOrHideQRCode();\" />";
315 echo "</td>\n";
316 echo "</tr>\n";
317
318 echo "<tr>\n";
319 echo "<th></th>\n";
320 echo "<td><div id=\"GA_QR_INFO\" style=\"display: none\" >";
321 echo "<div id=\"GA_QRCODE\"/></div>";
322
323 echo '<span class="description"><br/> ' . __( 'Scan this with the Google Authenticator app.', 'google-authenticator' ) . '</span>';
324 echo "</div></td>\n";
325 echo "</tr>\n";
326
327 echo "<tr>\n";
328 echo "<th scope=\"row\">".__( 'Enable App password', 'google-authenticator' )."</th>\n";
329 echo "<td>\n";
330 echo "<input name=\"GA_pwdenabled\" id=\"GA_pwdenabled\" class=\"tog\" type=\"checkbox\"" . checked( $GA_pwdenabled, 'enabled', false ) . "/><span class=\"description\">".__(' Enabling an App password will decrease your overall login security.','google-authenticator')."</span>\n";
331 echo "</td>\n";
332 echo "</tr>\n";
333
334 echo "<tr>\n";
335 echo "<th></th>\n";
336 echo "<td>\n";
337 echo "<input name=\"GA_password\" id=\"GA_password\" readonly=\"readonly\" value=\"".$GA_password."\" type=\"text\" size=\"25\" />";
338 echo "<input name=\"GA_createpassword\" id=\"GA_createpassword\" value=\"".__("Create new password",'google-authenticator')."\" type=\"button\" class=\"button\" />";
339 echo "<span class=\"description\" id=\"GA_passworddesc\"> ".__(' Password is not stored in cleartext, this is your only chance to see it.','google-authenticator')."</span>\n";
340 echo "</td>\n";
341 echo "</tr>\n";
342 }
343
344 echo "</tbody></table>\n";
345 echo "<script type=\"text/javascript\">\n";
346 echo "var GAnonce='".wp_create_nonce('GoogleAuthenticatoraction')."';\n";
347
348 echo <<<ENDOFJS
349 //Create new secret and display it
350 jQuery('#GA_newsecret').bind('click', function() {
351 // Remove existing QRCode
352 jQuery('#GA_QRCODE').html("");
353 var data=new Object();
354 data['action'] = 'GoogleAuthenticator_action';
355 data['nonce'] = GAnonce;
356 jQuery.post(ajaxurl, data, function(response) {
357 jQuery('#GA_secret').val(response['new-secret']);
358 var qrcode="otpauth://totp/CryptoMerian:"+escape(jQuery('#GA_description').val())+"?secret="+jQuery('#GA_secret').val()+"&issuer=CryptoMerian";
359 jQuery('#GA_QRCODE').qrcode(qrcode);
360 jQuery('#GA_QR_INFO').show('slow');
361 });
362 });
363
364 // If the user starts modifying the description, hide the qrcode
365 jQuery('#GA_description').bind('focus blur change keyup', function() {
366 // Only remove QR Code if it's visible
367 if (jQuery('#GA_QR_INFO').is(':visible')) {
368 jQuery('#GA_QR_INFO').hide('slow');
369 jQuery('#GA_QRCODE').html("");
370 }
371 });
372
373 // Create new app password
374 jQuery('#GA_createpassword').bind('click',function() {
375 var data=new Object();
376 data['action'] = 'GoogleAuthenticator_action';
377 data['nonce'] = GAnonce;
378 data['save'] = 1;
379 jQuery.post(ajaxurl, data, function(response) {
380 jQuery('#GA_password').val(response['new-secret'].match(new RegExp(".{0,4}","g")).join(' '));
381 jQuery('#GA_passworddesc').show();
382 });
383 });
384
385 jQuery('#GA_enabled').bind('change',function() {
386 GoogleAuthenticator_apppasswordcontrol();
387 });
388
389 jQuery(document).ready(function() {
390 jQuery('#GA_passworddesc').hide();
391 GoogleAuthenticator_apppasswordcontrol();
392 });
393
394 function GoogleAuthenticator_apppasswordcontrol() {
395 if (jQuery('#GA_enabled').is(':checked')) {
396 jQuery('#GA_pwdenabled').removeAttr('disabled');
397 jQuery('#GA_createpassword').removeAttr('disabled');
398 } else {
399 jQuery('#GA_pwdenabled').removeAttr('checked')
400 jQuery('#GA_pwdenabled').attr('disabled', true);
401 jQuery('#GA_createpassword').attr('disabled', true);
402 }
403 }
404
405 function ShowOrHideQRCode() {
406 if (jQuery('#GA_QR_INFO').is(':hidden')) {
407 var qrcode="otpauth://totp/CryptoMerian:"+escape(jQuery('#GA_description').val())+"?secret="+jQuery('#GA_secret').val()+"&issuer=CryptoMerian";
408 jQuery('#GA_QRCODE').qrcode(qrcode);
409 jQuery('#GA_QR_INFO').show('slow');
410 } else {
411 jQuery('#GA_QR_INFO').hide('slow');
412 jQuery('#GA_QRCODE').html("");
413 }
414 }
415</script>
416ENDOFJS;
417}
418
419/**
420 * Form handling of Google Authenticator options added to personal profile page (user editing his own profile)
421 */
422function personal_options_update() {
423 global $user_id;
424
425 // If editing of Google Authenticator settings has been disabled, just return
426 $GA_hidefromuser = trim( get_user_option( 'googleauthenticator_hidefromuser', $user_id ) );
427 if ( $GA_hidefromuser == 'enabled') return;
428
429
430 $GA_enabled = ! empty( $_POST['GA_enabled'] );
431 $GA_description = trim( sanitize_text_field($_POST['GA_description'] ) );
432 $GA_relaxedmode = ! empty( $_POST['GA_relaxedmode'] );
433 $GA_secret = trim( $_POST['GA_secret'] );
434 $GA_pwdenabled = ! empty( $_POST['GA_pwdenabled'] );
435 $GA_password = str_replace(' ', '', trim( $_POST['GA_password'] ) );
436
437 if ( ! $GA_enabled ) {
438 $GA_enabled = 'disabled';
439 } else {
440 $GA_enabled = 'enabled';
441 }
442
443 if ( ! $GA_relaxedmode ) {
444 $GA_relaxedmode = 'disabled';
445 } else {
446 $GA_relaxedmode = 'enabled';
447 }
448
449
450 if ( ! $GA_pwdenabled ) {
451 $GA_pwdenabled = 'disabled';
452 } else {
453 $GA_pwdenabled = 'enabled';
454 }
455
456 // Only store password if a new one has been generated.
457 if (strtoupper($GA_password) != 'XXXXXXXXXXXXXXXX' ) {
458 // Store the password in a format that can be expanded easily later on if needed.
459 $GA_password = array( 'appname' => 'Default', 'password' => wp_hash_password( $GA_password ) );
460 update_user_option( $user_id, 'googleauthenticator_passwords', json_encode( $GA_password ), true );
461 }
462
463 update_user_option( $user_id, 'googleauthenticator_enabled', $GA_enabled, true );
464 update_user_option( $user_id, 'googleauthenticator_description', $GA_description, true );
465 update_user_option( $user_id, 'googleauthenticator_relaxedmode', $GA_relaxedmode, true );
466 update_user_option( $user_id, 'googleauthenticator_secret', $GA_secret, true );
467 update_user_option( $user_id, 'googleauthenticator_pwdenabled', $GA_pwdenabled, true );
468
469}
470
471/**
472 * Extend profile page with ability to enable/disable Google Authenticator authentication requirement.
473 * Used by an administrator when editing other users.
474 */
475function edit_user_profile() {
476 global $user_id;
477 $GA_enabled = trim( get_user_option( 'googleauthenticator_enabled', $user_id ) );
478 $GA_hidefromuser = trim( get_user_option( 'googleauthenticator_hidefromuser', $user_id ) );
479 echo "<h3>".__('Google Authenticator Settings','google-authenticator')."</h3>\n";
480 echo "<table class=\"form-table\">\n";
481 echo "<tbody>\n";
482
483 echo "<tr>\n";
484 echo "<th scope=\"row\">".__('Hide settings from user','google-authenticator')."</th>\n";
485 echo "<td>\n";
486 echo "<div><input name=\"GA_hidefromuser\" id=\"GA_hidefromuser\" class=\"tog\" type=\"checkbox\"" . checked( $GA_hidefromuser, 'enabled', false ) . "/>\n";
487 echo "</td>\n";
488 echo "</tr>\n";
489
490 echo "<tr>\n";
491 echo "<th scope=\"row\">".__('Active','google-authenticator')."</th>\n";
492 echo "<td>\n";
493 echo "<div><input name=\"GA_enabled\" id=\"GA_enabled\" class=\"tog\" type=\"checkbox\"" . checked( $GA_enabled, 'enabled', false ) . "/>\n";
494 echo "</td>\n";
495 echo "</tr>\n";
496
497 echo "</tbody>\n";
498 echo "</table>\n";
499}
500
501/**
502 * Form handling of Google Authenticator options on edit profile page (admin user editing other user)
503 */
504function edit_user_profile_update() {
505 global $user_id;
506
507 $GA_enabled = ! empty( $_POST['GA_enabled'] );
508 $GA_hidefromuser = ! empty( $_POST['GA_hidefromuser'] );
509
510 if ( ! $GA_enabled ) {
511 $GA_enabled = 'disabled';
512 } else {
513 $GA_enabled = 'enabled';
514 }
515
516 if ( ! $GA_hidefromuser ) {
517 $GA_hidefromuser = 'disabled';
518 } else {
519 $GA_hidefromuser = 'enabled';
520 }
521
522 update_user_option( $user_id, 'googleauthenticator_enabled', $GA_enabled, true );
523 update_user_option( $user_id, 'googleauthenticator_hidefromuser', $GA_hidefromuser, true );
524
525}
526
527
528/**
529* AJAX callback function used to generate new secret
530*/
531function ajax_callback() {
532 global $user_id;
533
534 // Some AJAX security.
535 check_ajax_referer( 'GoogleAuthenticatoraction', 'nonce' );
536
537 // Create new secret.
538 $secret = $this->create_secret();
539
540 $result = array( 'new-secret' => $secret );
541 header( 'Content-Type: application/json' );
542 echo json_encode( $result );
543
544 // die() is required to return a proper result
545 die();
546}
547
548} // end class
549
550$google_authenticator = new GoogleAuthenticator;
551?>