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709 | daniel-mar | 1 | <?php |
2 | |||
3 | /* |
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4 | * OIDplus 2.0 |
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1086 | daniel-mar | 5 | * Copyright 2019 - 2023 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 | |||
1050 | daniel-mar | 20 | namespace ViaThinkSoft\OIDplus; |
709 | daniel-mar | 21 | |
1086 | daniel-mar | 22 | // phpcs:disable PSR1.Files.SideEffects |
23 | \defined('INSIDE_OIDPLUS') or die; |
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24 | // phpcs:enable PSR1.Files.SideEffects |
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25 | |||
709 | daniel-mar | 26 | class OIDplusCaptchaPluginVtsClientChallenge extends OIDplusCaptchaPlugin { |
27 | |||
1116 | daniel-mar | 28 | /** |
29 | * @return string |
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30 | */ |
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709 | daniel-mar | 31 | public static function id(): string { |
32 | return 'ViaThinkSoft Client Challenge'; |
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33 | } |
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34 | |||
1116 | daniel-mar | 35 | /** |
36 | * @return bool |
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37 | */ |
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1016 | daniel-mar | 38 | public function isVisible(): bool { |
709 | daniel-mar | 39 | return false; |
40 | } |
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41 | |||
1116 | daniel-mar | 42 | /** |
43 | * @param string $actionID |
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44 | * @return bool |
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45 | */ |
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46 | public function csrfUnlock(string $actionID): bool { |
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47 | if ($actionID == 'get_challenge') return true; |
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48 | return parent::csrfUnlock($actionID); |
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709 | daniel-mar | 49 | } |
50 | |||
1116 | daniel-mar | 51 | /** |
52 | * @param string $actionID |
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53 | * @param array $params |
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54 | * @return array |
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55 | * @throws OIDplusException |
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56 | */ |
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57 | public function action(string $actionID, array $params): array { |
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709 | daniel-mar | 58 | if ($actionID == 'get_challenge') { |
59 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
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60 | |||
1025 | daniel-mar | 61 | $offset = 0; // doesn't matter |
62 | $min = $offset; |
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63 | $max = $offset + OIDplus::baseConfig()->getValue('VTS_CAPTCHA_COMPLEXITY', 50000); |
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64 | if ($max > mt_getrandmax()) $max = mt_getrandmax(); |
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65 | |||
709 | daniel-mar | 66 | $starttime = time(); |
1025 | daniel-mar | 67 | $random = mt_rand($min,$max); |
709 | daniel-mar | 68 | $ip_target = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown'; |
69 | $challenge = sha3_512($starttime.'/'.$ip_target.'/'.$random); |
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70 | $challenge_integrity = sha3_512_hmac($challenge,$server_secret); |
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71 | $send_to_client = array($starttime, $ip_target, $challenge, $min, $max, $challenge_integrity); |
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72 | |||
1022 | daniel-mar | 73 | $open_trans_file = self::getOpenTransFileName($ip_target, $random); |
74 | if (@file_put_contents($open_trans_file, '') === false) { |
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75 | throw new OIDplusException(_L('Cannot write file %1', $open_trans_file)); |
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76 | } |
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77 | |||
1025 | daniel-mar | 78 | return array( |
79 | "status" => 0, |
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80 | "challenge" => $send_to_client, |
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81 | // Autosolve on=calculate result on page load; off=calculate result on form submit |
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82 | "autosolve" => OIDplus::baseConfig()->getValue('VTS_CAPTCHA_AUTOSOLVE', true) |
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83 | ); |
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1116 | daniel-mar | 84 | } else { |
85 | return parent::action($actionID, $params); |
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709 | daniel-mar | 86 | } |
87 | } |
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88 | |||
1116 | daniel-mar | 89 | /** |
90 | * @param $ip_target |
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91 | * @param $random |
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92 | * @return string |
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93 | * @throws OIDplusException |
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94 | */ |
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1022 | daniel-mar | 95 | private static function getOpenTransFileName($ip_target, $random) { |
96 | $dir = OIDplus::localpath().'/userdata/cache'; |
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1024 | daniel-mar | 97 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
1022 | daniel-mar | 98 | |
99 | // First, delete challenges which were never completed |
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100 | $files = glob($dir.'/vts_client_challenge_*.tmp'); |
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101 | $expire = strtotime('-3 DAYS'); |
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102 | foreach ($files as $file) { |
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103 | if (!is_file($file)) continue; |
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104 | if (filemtime($file) > $expire) continue; |
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105 | @unlink($file); |
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106 | } |
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107 | |||
1024 | daniel-mar | 108 | return $dir.'/vts_client_challenge_'.sha3_512_hmac($ip_target.'/'.$random, $server_secret).'.tmp'; |
1022 | daniel-mar | 109 | } |
110 | |||
1116 | daniel-mar | 111 | /** |
112 | * @param string|null $header_text |
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113 | * @param string|null $footer_text |
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114 | * @return string |
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115 | * @throws OIDplusException |
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116 | */ |
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117 | public function captchaGenerate(string $header_text=null, string $footer_text=null): string { |
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709 | daniel-mar | 118 | return '<noscript>'. |
1024 | daniel-mar | 119 | '<p><font color="red">'._L('You need to enable JavaScript to solve the CAPTCHA.').'</font></p>'. |
120 | '</noscript>'. |
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121 | '<input type="hidden" id="vts_validation_result" name="vts_validation_result" value="">'. |
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122 | '<script>'. |
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123 | 'OIDplusCaptchaPluginVtsClientChallenge.captchaShow('.js_escape(OIDplus::webpath(null,OIDplus::PATH_RELATIVE)).');'. |
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124 | '</script>'; |
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709 | daniel-mar | 125 | } |
126 | |||
1116 | daniel-mar | 127 | /** |
128 | * @param array $params |
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129 | * @param string|null $fieldname |
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130 | * @return void |
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131 | * @throws OIDplusException |
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132 | */ |
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133 | public function captchaVerify(array $params, string $fieldname=null) { |
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709 | daniel-mar | 134 | |
135 | if (is_null($fieldname)) $fieldname = 'vts_validation_result'; |
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136 | |||
137 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
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138 | |||
1024 | daniel-mar | 139 | if (!isset($params[$fieldname])) throw new OIDplusException(_L('No challenge response found').' (A)'); |
709 | daniel-mar | 140 | |
1022 | daniel-mar | 141 | $client_response = @json_decode($params[$fieldname], true); |
1024 | daniel-mar | 142 | |
143 | if (!is_array($client_response)) throw new OIDplusException(_L('Challenge response is invalid').' (B)'); |
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144 | if (count($client_response) != 5) throw new OIDplusException(_L('Challenge response is invalid').' (C)'); |
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1022 | daniel-mar | 145 | list($starttime, $ip_target, $challenge, $answer, $challenge_integrity) = $client_response; |
1024 | daniel-mar | 146 | if (!is_numeric($starttime)) throw new OIDplusException(_L('Challenge response is invalid').' (D)'); |
147 | if (!is_string($ip_target)) throw new OIDplusException(_L('Challenge response is invalid').' (E)'); |
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148 | if (!is_string($challenge)) throw new OIDplusException(_L('Challenge response is invalid').' (F)'); |
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149 | if (!is_numeric($answer)) throw new OIDplusException(_L('Challenge response is invalid').' (G)'); |
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150 | if (!is_string($challenge_integrity)) throw new OIDplusException(_L('Challenge response is invalid').' (H)'); |
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151 | |||
1022 | daniel-mar | 152 | $open_trans_file = self::getOpenTransFileName($ip_target, $answer); |
709 | daniel-mar | 153 | |
1024 | daniel-mar | 154 | $current_ip = (isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown'); |
155 | if ($ip_target != $current_ip) { |
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156 | throw new OIDplusException(_L('IP address has changed. Please try again. (current IP %1, expected %2)', $current_ip, $ip_target)); |
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1025 | daniel-mar | 157 | } else if (time()-$starttime > OIDplus::baseConfig()->getValue('VTS_CAPTCHA_MAXTIME', 10*60/*10 minutes*/)) { |
1024 | daniel-mar | 158 | throw new OIDplusException(_L('Challenge expired. Please try again.')); |
709 | daniel-mar | 159 | } else if ($challenge_integrity != sha3_512_hmac($challenge,$server_secret)) { |
718 | daniel-mar | 160 | throw new OIDplusException(_L('Challenge integrity failed')); |
709 | daniel-mar | 161 | } else if ($challenge !== sha3_512($starttime.'/'.$ip_target.'/'.$answer)) { |
718 | daniel-mar | 162 | throw new OIDplusException(_L('Wrong answer')); |
1022 | daniel-mar | 163 | } else if (!file_exists($open_trans_file)) { |
164 | throw new OIDplusException(_L('Challenge submitted twice or transaction missing')); |
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165 | } else { |
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166 | @unlink($open_trans_file); |
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709 | daniel-mar | 167 | } |
168 | } |
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169 | |||
1116 | daniel-mar | 170 | /** |
171 | * @return string |
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172 | */ |
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709 | daniel-mar | 173 | public static function setupHTML(): string { |
174 | return '<div id="CAPTCHAPLUGIN_PARAMS_VtsClientChallenge">'. |
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175 | '<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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176 | '</div>'; |
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177 | } |
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178 | |||
179 | } |