| 0,0 → 1,119 |
|---|
| <?php |
| |
| /* |
| * OIDplus 2.0 |
| * Copyright 2019 - 2021 Daniel Marschall, ViaThinkSoft |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| if (!defined('INSIDE_OIDPLUS')) die(); |
| |
| class OIDplusCaptchaPluginVtsClientChallenge extends OIDplusCaptchaPlugin { |
| |
| public static function id(): string { |
| return 'ViaThinkSoft Client Challenge'; |
| } |
| |
| public static function isVisible(): bool { |
| return false; |
| } |
| |
| public function csrfUnlock($actionID) { |
| if ($actionID == 'get_challenge') { |
| return true; |
| } |
| return false; |
| } |
| |
| public function action($actionID, $params) { |
| if ($actionID == 'get_challenge') { |
| $complexity=500000; // TODO: make configurable |
| $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
| |
| $min = 0; |
| $max = $complexity; |
| $starttime = time(); |
| $random = rand($min,$max); // TODO: cryptographic rand |
| $ip_target = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown'; |
| $challenge = sha3_512($starttime.'/'.$ip_target.'/'.$random); |
| $challenge_integrity = sha3_512_hmac($challenge,$server_secret); |
| $send_to_client = array($starttime, $ip_target, $challenge, $min, $max, $challenge_integrity); |
| |
| return array("status" => 0, "challenge" => $send_to_client); |
| } |
| } |
| |
| public function captchaDomHead() { |
| // Here you can add styles and scripts to be included into the HTML <head> part |
| return '<script> |
| function oidplus_captcha_response() { |
| return OIDplusCaptchaPluginVtsClientChallenge.captchaResponse(); |
| } |
| function oidplus_captcha_reset() { |
| return OIDplusCaptchaPluginVtsClientChallenge.captchaReset(true); |
| } |
| </script> |
| |
| <script src="'.(OIDplus::webPath() . '/vendor/components/jquery/jquery.min.js').'"></script> |
| <script src="'.(OIDplus::webPath() . '/vendor/emn178/js-sha3/src/sha3.js').'"></script> |
| <script src="'.(OIDplus::webPath(__DIR__) . '/OIDplusCaptchaPluginVtsClientChallenge.js').'"></script> |
| '; // we include OIDplusCaptchaPluginVtsClientChallenge.js not via manifest.xml, otherwise oobe.php would not work |
| } |
| |
| public function captchaGenerate($header_text=null, $footer_text=null) { |
| return '<noscript>'. |
| '<p><font color="red">'._L('You need to enable JavaScript to solve the CAPTCHA.').'</font></p>'. |
| '</noscript>'. |
| '<input type="text" id="vts_validation_result" name="vts_validation_result" value="" style="display:none">'. |
| '<script> |
| OIDplusCaptchaPluginVtsClientChallenge.captchaReset(true); // try to solve it while the user enters the form |
| $("form").submit(function(e){ |
| if (!OIDplusCaptchaPluginVtsClientChallenge.currentresponse) { |
| // if the user is too fast, then we will calculate it now |
| OIDplusCaptchaPluginVtsClientChallenge.currentresponse = OIDplusCaptchaPluginVtsClientChallenge.captchaResponse(); |
| } |
| $("#vts_validation_result").val(OIDplusCaptchaPluginVtsClientChallenge.currentresponse); |
| }); |
| </script>'; |
| } |
| |
| public function captchaVerify($params, $fieldname=null) { |
| |
| if (is_null($fieldname)) $fieldname = 'vts_validation_result'; |
| |
| $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
| $max_time = 10*60; // 10min. TODO: make configurable! |
| |
| if (!isset($params[$fieldname])) throw new \Exception('No challenge response found'); |
| |
| list($starttime, $ip_target, $challenge, $answer, $challenge_integrity) = @json_decode($params[$fieldname], true); |
| |
| if ($ip_target != (isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown')) { |
| throw new \Exception(_L('Wrong IP address')); |
| } else if (time()-$starttime > $max_time) { |
| throw new \Exception(_L('Challenge expired')); |
| } else if ($challenge_integrity != sha3_512_hmac($challenge,$server_secret)) { |
| throw new \Exception(_L('Challenge integrity failed')); |
| } else if ($challenge !== sha3_512($starttime.'/'.$ip_target.'/'.$answer)) { |
| throw new \Exception(_L('Wrong answer')); |
| } |
| } |
| |
| public static function setupHTML(): string { |
| return '<div id="CAPTCHAPLUGIN_PARAMS_VtsClientChallenge">'. |
| '<p>'._L('ViaThinkSoft Client Challenge lets the client computer solve a cryptographic problem instead of letting the user solve a CAPTCHA. This slows down brute-force attacks.').'</p>'. |
| '</div>'; |
| } |
| |
| } |