Rev 1050 | Rev 1116 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
709 | daniel-mar | 1 | <?php |
2 | |||
3 | /* |
||
4 | * OIDplus 2.0 |
||
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"); |
||
8 | * you may not use this file except in compliance with the License. |
||
9 | * You may obtain a copy of the License at |
||
10 | * |
||
11 | * http://www.apache.org/licenses/LICENSE-2.0 |
||
12 | * |
||
13 | * Unless required by applicable law or agreed to in writing, software |
||
14 | * distributed under the License is distributed on an "AS IS" BASIS, |
||
15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
||
16 | * See the License for the specific language governing permissions and |
||
17 | * limitations under the License. |
||
18 | */ |
||
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; |
||
24 | // phpcs:enable PSR1.Files.SideEffects |
||
25 | |||
709 | daniel-mar | 26 | class OIDplusCaptchaPluginVtsClientChallenge extends OIDplusCaptchaPlugin { |
27 | |||
28 | public static function id(): string { |
||
29 | return 'ViaThinkSoft Client Challenge'; |
||
30 | } |
||
31 | |||
1016 | daniel-mar | 32 | public function isVisible(): bool { |
709 | daniel-mar | 33 | return false; |
34 | } |
||
35 | |||
36 | public function csrfUnlock($actionID) { |
||
37 | if ($actionID == 'get_challenge') { |
||
38 | return true; |
||
39 | } |
||
40 | return false; |
||
41 | } |
||
42 | |||
43 | public function action($actionID, $params) { |
||
44 | if ($actionID == 'get_challenge') { |
||
45 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
||
46 | |||
1025 | daniel-mar | 47 | $offset = 0; // doesn't matter |
48 | $min = $offset; |
||
49 | $max = $offset + OIDplus::baseConfig()->getValue('VTS_CAPTCHA_COMPLEXITY', 50000); |
||
50 | if ($max > mt_getrandmax()) $max = mt_getrandmax(); |
||
51 | |||
709 | daniel-mar | 52 | $starttime = time(); |
1025 | daniel-mar | 53 | $random = mt_rand($min,$max); |
709 | daniel-mar | 54 | $ip_target = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown'; |
55 | $challenge = sha3_512($starttime.'/'.$ip_target.'/'.$random); |
||
56 | $challenge_integrity = sha3_512_hmac($challenge,$server_secret); |
||
57 | $send_to_client = array($starttime, $ip_target, $challenge, $min, $max, $challenge_integrity); |
||
58 | |||
1022 | daniel-mar | 59 | $open_trans_file = self::getOpenTransFileName($ip_target, $random); |
60 | if (@file_put_contents($open_trans_file, '') === false) { |
||
61 | throw new OIDplusException(_L('Cannot write file %1', $open_trans_file)); |
||
62 | } |
||
63 | |||
1025 | daniel-mar | 64 | return array( |
65 | "status" => 0, |
||
66 | "challenge" => $send_to_client, |
||
67 | // Autosolve on=calculate result on page load; off=calculate result on form submit |
||
68 | "autosolve" => OIDplus::baseConfig()->getValue('VTS_CAPTCHA_AUTOSOLVE', true) |
||
69 | ); |
||
709 | daniel-mar | 70 | } |
71 | } |
||
72 | |||
1022 | daniel-mar | 73 | private static function getOpenTransFileName($ip_target, $random) { |
74 | $dir = OIDplus::localpath().'/userdata/cache'; |
||
1024 | daniel-mar | 75 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
1022 | daniel-mar | 76 | |
77 | // First, delete challenges which were never completed |
||
78 | $files = glob($dir.'/vts_client_challenge_*.tmp'); |
||
79 | $expire = strtotime('-3 DAYS'); |
||
80 | foreach ($files as $file) { |
||
81 | if (!is_file($file)) continue; |
||
82 | if (filemtime($file) > $expire) continue; |
||
83 | @unlink($file); |
||
84 | } |
||
85 | |||
1024 | daniel-mar | 86 | return $dir.'/vts_client_challenge_'.sha3_512_hmac($ip_target.'/'.$random, $server_secret).'.tmp'; |
1022 | daniel-mar | 87 | } |
88 | |||
709 | daniel-mar | 89 | public function captchaGenerate($header_text=null, $footer_text=null) { |
90 | return '<noscript>'. |
||
1024 | daniel-mar | 91 | '<p><font color="red">'._L('You need to enable JavaScript to solve the CAPTCHA.').'</font></p>'. |
92 | '</noscript>'. |
||
93 | '<input type="hidden" id="vts_validation_result" name="vts_validation_result" value="">'. |
||
94 | '<script>'. |
||
95 | 'OIDplusCaptchaPluginVtsClientChallenge.captchaShow('.js_escape(OIDplus::webpath(null,OIDplus::PATH_RELATIVE)).');'. |
||
96 | '</script>'; |
||
709 | daniel-mar | 97 | } |
98 | |||
99 | public function captchaVerify($params, $fieldname=null) { |
||
100 | |||
101 | if (is_null($fieldname)) $fieldname = 'vts_validation_result'; |
||
102 | |||
103 | $server_secret='VtsClientChallenge:'.OIDplus::baseConfig()->getValue('SERVER_SECRET'); |
||
104 | |||
1024 | daniel-mar | 105 | if (!isset($params[$fieldname])) throw new OIDplusException(_L('No challenge response found').' (A)'); |
709 | daniel-mar | 106 | |
1022 | daniel-mar | 107 | $client_response = @json_decode($params[$fieldname], true); |
1024 | daniel-mar | 108 | |
109 | if (!is_array($client_response)) throw new OIDplusException(_L('Challenge response is invalid').' (B)'); |
||
110 | if (count($client_response) != 5) throw new OIDplusException(_L('Challenge response is invalid').' (C)'); |
||
1022 | daniel-mar | 111 | list($starttime, $ip_target, $challenge, $answer, $challenge_integrity) = $client_response; |
1024 | daniel-mar | 112 | if (!is_numeric($starttime)) throw new OIDplusException(_L('Challenge response is invalid').' (D)'); |
113 | if (!is_string($ip_target)) throw new OIDplusException(_L('Challenge response is invalid').' (E)'); |
||
114 | if (!is_string($challenge)) throw new OIDplusException(_L('Challenge response is invalid').' (F)'); |
||
115 | if (!is_numeric($answer)) throw new OIDplusException(_L('Challenge response is invalid').' (G)'); |
||
116 | if (!is_string($challenge_integrity)) throw new OIDplusException(_L('Challenge response is invalid').' (H)'); |
||
117 | |||
1022 | daniel-mar | 118 | $open_trans_file = self::getOpenTransFileName($ip_target, $answer); |
709 | daniel-mar | 119 | |
1024 | daniel-mar | 120 | $current_ip = (isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : 'unknown'); |
121 | if ($ip_target != $current_ip) { |
||
122 | throw new OIDplusException(_L('IP address has changed. Please try again. (current IP %1, expected %2)', $current_ip, $ip_target)); |
||
1025 | daniel-mar | 123 | } else if (time()-$starttime > OIDplus::baseConfig()->getValue('VTS_CAPTCHA_MAXTIME', 10*60/*10 minutes*/)) { |
1024 | daniel-mar | 124 | throw new OIDplusException(_L('Challenge expired. Please try again.')); |
709 | daniel-mar | 125 | } else if ($challenge_integrity != sha3_512_hmac($challenge,$server_secret)) { |
718 | daniel-mar | 126 | throw new OIDplusException(_L('Challenge integrity failed')); |
709 | daniel-mar | 127 | } else if ($challenge !== sha3_512($starttime.'/'.$ip_target.'/'.$answer)) { |
718 | daniel-mar | 128 | throw new OIDplusException(_L('Wrong answer')); |
1022 | daniel-mar | 129 | } else if (!file_exists($open_trans_file)) { |
130 | throw new OIDplusException(_L('Challenge submitted twice or transaction missing')); |
||
131 | } else { |
||
132 | @unlink($open_trans_file); |
||
709 | daniel-mar | 133 | } |
134 | } |
||
135 | |||
136 | public static function setupHTML(): string { |
||
137 | return '<div id="CAPTCHAPLUGIN_PARAMS_VtsClientChallenge">'. |
||
138 | '<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>'. |
||
139 | '</div>'; |
||
140 | } |
||
141 | |||
142 | } |