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Rev | Author | Line No. | Line |
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709 | daniel-mar | 1 | <?php |
2 | |||
3 | /* |
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4 | * OIDplus 2.0 |
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1022 | daniel-mar | 5 | * Copyright 2019 - 2022 Daniel Marschall, ViaThinkSoft |
709 | daniel-mar | 6 | * |
7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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8 | * you may not use this file except in compliance with the License. |
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9 | * You may obtain a copy of the License at |
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10 | * |
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11 | * http://www.apache.org/licenses/LICENSE-2.0 |
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12 | * |
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13 | * Unless required by applicable law or agreed to in writing, software |
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14 | * distributed under the License is distributed on an "AS IS" BASIS, |
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15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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16 | * See the License for the specific language governing permissions and |
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17 | * limitations under the License. |
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18 | */ |
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19 | |||
20 | if (!defined('INSIDE_OIDPLUS')) die(); |
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21 | |||
22 | class OIDplusCaptchaPluginVtsClientChallenge extends OIDplusCaptchaPlugin { |
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23 | |||
24 | public static function id(): string { |
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25 | return 'ViaThinkSoft Client Challenge'; |
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26 | } |
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27 | |||
1016 | daniel-mar | 28 | public function isVisible(): bool { |
709 | daniel-mar | 29 | return false; |
30 | } |
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31 | |||
32 | public function csrfUnlock($actionID) { |
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33 | if ($actionID == 'get_challenge') { |
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34 | return true; |
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35 | } |
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36 | return false; |
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37 | } |
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38 | |||
39 | public function action($actionID, $params) { |
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40 | if ($actionID == 'get_challenge') { |
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1017 | daniel-mar | 41 | $complexity=50000; // TODO: make configurable |
709 | daniel-mar | 42 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
43 | |||
44 | $min = 0; |
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45 | $max = $complexity; |
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46 | $starttime = time(); |
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47 | $random = rand($min,$max); // TODO: cryptographic rand |
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48 | $ip_target = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown'; |
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49 | $challenge = sha3_512($starttime.'/'.$ip_target.'/'.$random); |
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50 | $challenge_integrity = sha3_512_hmac($challenge,$server_secret); |
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51 | $send_to_client = array($starttime, $ip_target, $challenge, $min, $max, $challenge_integrity); |
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52 | |||
1022 | daniel-mar | 53 | $open_trans_file = self::getOpenTransFileName($ip_target, $random); |
54 | if (@file_put_contents($open_trans_file, '') === false) { |
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55 | throw new OIDplusException(_L('Cannot write file %1', $open_trans_file)); |
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56 | } |
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57 | |||
709 | daniel-mar | 58 | return array("status" => 0, "challenge" => $send_to_client); |
59 | } |
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60 | } |
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61 | |||
1022 | daniel-mar | 62 | private static function getOpenTransFileName($ip_target, $random) { |
63 | $dir = OIDplus::localpath().'/userdata/cache'; |
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64 | |||
65 | // First, delete challenges which were never completed |
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66 | $files = glob($dir.'/vts_client_challenge_*.tmp'); |
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67 | $expire = strtotime('-3 DAYS'); |
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68 | foreach ($files as $file) { |
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69 | if (!is_file($file)) continue; |
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70 | if (filemtime($file) > $expire) continue; |
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71 | @unlink($file); |
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72 | } |
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73 | |||
74 | return $dir.'/vts_client_challenge_'.sha3_512($ip_target.'/'.$random).'.tmp'; |
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75 | } |
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76 | |||
709 | daniel-mar | 77 | public function captchaGenerate($header_text=null, $footer_text=null) { |
78 | return '<noscript>'. |
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79 | '<p><font color="red">'._L('You need to enable JavaScript to solve the CAPTCHA.').'</font></p>'. |
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80 | '</noscript>'. |
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1017 | daniel-mar | 81 | '<input type="hidden" id="vts_validation_result" name="vts_validation_result" value="">'. |
709 | daniel-mar | 82 | '<script> |
1018 | daniel-mar | 83 | var oidplus_captcha_response = function() { |
709 | daniel-mar | 84 | if (!OIDplusCaptchaPluginVtsClientChallenge.currentresponse) { |
85 | // if the user is too fast, then we will calculate it now |
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86 | OIDplusCaptchaPluginVtsClientChallenge.currentresponse = OIDplusCaptchaPluginVtsClientChallenge.captchaResponse(); |
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87 | } |
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1018 | daniel-mar | 88 | return OIDplusCaptchaPluginVtsClientChallenge.currentresponse; |
89 | }; |
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90 | var oidplus_captcha_reset = function() { |
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91 | var autosolve = false; // autosolve blocks the UI. not good |
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92 | return OIDplusCaptchaPluginVtsClientChallenge.captchaReset("'.(OIDplus::webpath(null,OIDplus::PATH_RELATIVE)).'", autosolve); |
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93 | }; |
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94 | oidplus_captcha_reset(); |
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95 | $("form").submit(function(e){ |
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96 | $("#vts_validation_result").val(oidplus_captcha_response()); |
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709 | daniel-mar | 97 | }); |
98 | </script>'; |
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99 | } |
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100 | |||
101 | public function captchaVerify($params, $fieldname=null) { |
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102 | |||
103 | if (is_null($fieldname)) $fieldname = 'vts_validation_result'; |
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104 | |||
105 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
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106 | $max_time = 10*60; // 10min. TODO: make configurable! |
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107 | |||
1022 | daniel-mar | 108 | if (!isset($params[$fieldname])) throw new OIDplusException(_L('No challenge response found')); |
709 | daniel-mar | 109 | |
1022 | daniel-mar | 110 | $client_response = @json_decode($params[$fieldname], true); |
111 | list($starttime, $ip_target, $challenge, $answer, $challenge_integrity) = $client_response; |
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112 | $open_trans_file = self::getOpenTransFileName($ip_target, $answer); |
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709 | daniel-mar | 113 | |
114 | if ($ip_target != (isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown')) { |
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718 | daniel-mar | 115 | throw new OIDplusException(_L('Wrong IP address')); |
709 | daniel-mar | 116 | } else if (time()-$starttime > $max_time) { |
718 | daniel-mar | 117 | throw new OIDplusException(_L('Challenge expired')); |
709 | daniel-mar | 118 | } else if ($challenge_integrity != sha3_512_hmac($challenge,$server_secret)) { |
718 | daniel-mar | 119 | throw new OIDplusException(_L('Challenge integrity failed')); |
709 | daniel-mar | 120 | } else if ($challenge !== sha3_512($starttime.'/'.$ip_target.'/'.$answer)) { |
718 | daniel-mar | 121 | throw new OIDplusException(_L('Wrong answer')); |
1022 | daniel-mar | 122 | } else if (!file_exists($open_trans_file)) { |
123 | throw new OIDplusException(_L('Challenge submitted twice or transaction missing')); |
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124 | } else { |
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125 | @unlink($open_trans_file); |
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709 | daniel-mar | 126 | } |
127 | } |
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128 | |||
129 | public static function setupHTML(): string { |
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130 | return '<div id="CAPTCHAPLUGIN_PARAMS_VtsClientChallenge">'. |
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131 | '<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>'. |
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132 | '</div>'; |
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133 | } |
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134 | |||
135 | } |