Michael Save
12 years ago
5 changed files with 274 additions and 178 deletions
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<?php |
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/* |
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* Copyright (c) 2010-2012 Tinyboard Development Group |
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*/ |
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if(realpath($_SERVER['SCRIPT_FILENAME']) == str_replace('\\', '/', __FILE__)) { |
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// You cannot request this file directly. |
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exit; |
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} |
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$hidden_inputs_twig = array(); |
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class AntiBot { |
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public $inputs = array(), $index = 0; |
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private $salt; |
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public static function randomString($length, $uppercase = false, $special_chars = false) { |
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$chars = 'abcdefghijklmnopqrstuvwxyz0123456789'; |
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if($uppercase) |
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$chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
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if($special_chars) |
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$chars .= ' ~!@#$%^&*()_+,./;\'[]\\{}|:"<>?=-` '; |
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$chars = str_split($chars); |
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$ch = array(); |
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// fill up $ch until we reach $length |
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while(count($ch) < $length) { |
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$n = $length - count($ch); |
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$keys = array_rand($chars, $n > count($chars) ? count($chars) : $n); |
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if($n == 1) { |
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$ch[] = $chars[$keys]; |
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break; |
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} |
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shuffle($keys); |
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foreach($keys as $key) |
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$ch[] = $chars[$key]; |
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} |
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$chars = $ch; |
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return implode('', $chars); |
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} |
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public static function make_confusing($string) { |
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$chars = str_split($string); |
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foreach($chars as &$c) { |
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if(rand(0, 2) != 0) |
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continue; |
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$c = mb_encode_numericentity($c, array(0, 0xffff, 0, 0xffff), 'UTF-8'); |
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} |
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return implode('', $chars); |
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} |
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public function __construct(array $salt = array()) { |
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global $config; |
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if(!empty($salt)) { |
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// create a salted hash of the "extra salt" |
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$this->salt = implode(':', $salt); |
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} else { |
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$this->salt = ''; |
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} |
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shuffle($config['spam']['hidden_input_names']); |
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$input_count = rand($config['spam']['hidden_inputs_min'], $config['spam']['hidden_inputs_max']); |
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$hidden_input_names_x = 0; |
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for($x = 0; $x < $input_count ; $x++) { |
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if($hidden_input_names_x === false || rand(0, 2) == 0) { |
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// Use an obscure name |
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$name = $this->randomString(rand(10, 40)); |
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} else { |
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// Use a pre-defined confusing name |
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$name = $config['spam']['hidden_input_names'][$hidden_input_names_x++]; |
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if($hidden_input_names_x >= count($config['spam']['hidden_input_names'])) |
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$hidden_input_names_x = false; |
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} |
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if(rand(0, 2) == 0) { |
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// Value must be null |
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$this->inputs[$name] = ''; |
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} elseif(rand(0, 4) == 0) { |
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// Numeric value |
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$this->inputs[$name] = (string)rand(0, 100); |
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} else { |
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// Obscure value |
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$this->inputs[$name] = $this->randomString(rand(5, 100)); |
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} |
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} |
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} |
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public function html($count = false) { |
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$elements = array( |
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'<input type="hidden" name="%name%" value="%value%">', |
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'<input type="hidden" value="%value%" name="%name%">', |
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'<input style="display:none" type="text" name="%name%" value="%value%">', |
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'<input style="display:none" type="text" value="%value%" name="%name%">', |
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'<span style="display:none"><input type="text" name="%name%" value="%value%"></span>', |
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'<div style="display:none"><input type="text" name="%name%" value="%value%"></div>', |
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'<div style="display:none"><input type="text" name="%name%" value="%value%"></div>', |
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'<textarea style="display:none" name="%name%">%value%</textarea>', |
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'<textarea name="%name%" style="display:none">%value%</textarea>' |
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); |
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$html = ''; |
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if($count == 0) { |
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// all elements |
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$inputs = array_slice($this->inputs, $this->index); |
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} else { |
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$inputs = array_slice($this->inputs, $this->index, $count); |
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} |
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$this->index += count($inputs); |
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foreach($inputs as $name => $value) { |
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$element = false; |
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while(!$element) { |
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$element = $elements[array_rand($elements)]; |
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if(strpos($element, 'textarea') !== false && $value == '') { |
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// There have been some issues with mobile web browsers and empty <textarea>'s. |
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$element = false; |
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} |
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} |
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$element = str_replace('%name%', utf8tohtml($name), $element); |
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if(rand(0, 2) == 0) |
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$value = $this->make_confusing($value); |
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else |
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$value = utf8tohtml($value); |
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$element = str_replace('%value%', $value, $element); |
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$html .= $element; |
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} |
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return $html; |
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} |
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public function hash() { |
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global $config; |
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// This is the tricky part: create a hash to validate it after |
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// First, sort the keys in alphabetical order (A-Z) |
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$inputs = $this->inputs; |
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ksort($inputs); |
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$hash = ''; |
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// Iterate through each input |
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foreach($inputs as $name => $value) { |
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$hash .= $name . '=' . $value; |
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} |
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// Add a salt to the hash |
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$hash .= $config['cookies']['salt']; |
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// Use SHA1 for the hash |
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return sha1($hash . $this->salt); |
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} |
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};; |
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function hiddenInputs(array $salt, $print_the_rest = false) { |
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global $hidden_inputs_twig; |
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$salt_str = implode(':', $salt); |
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if(!isset($hidden_inputs_twig[$salt_str])) |
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$hidden_inputs_twig[$salt_str] = new AntiBot($salt); |
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if($print_the_rest) |
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return $hidden_inputs_twig[$salt_str]->html(0); |
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else |
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return $hidden_inputs_twig[$salt_str]->html(rand(1, 5)); |
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} |
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function hiddenInputsHash(array $salt) { |
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global $hidden_inputs_twig; |
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$salt_str = implode(':', $salt); |
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if(!isset($hidden_inputs_twig[$salt_str])) |
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$hidden_inputs_twig[$salt_str] = new AntiBot($salt); |
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return $hidden_inputs_twig[$salt_str]->hash(); |
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} |
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function checkSpam(array $extra_salt = array()) { |
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global $config; |
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if(!isset($_POST['hash'])) |
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return true; |
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$hash = $_POST['hash']; |
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if(!empty($extra_salt)) { |
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// create a salted hash of the "extra salt" |
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$extra_salt = implode(':', $extra_salt); |
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} else { |
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$extra_salt = ''; |
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} |
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// Reconsturct the $inputs array |
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$inputs = array(); |
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foreach($_POST as $name => $value) { |
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if(in_array($name, $config['spam']['valid_inputs'])) |
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continue; |
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$inputs[$name] = $value; |
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} |
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// Sort the inputs in alphabetical order (A-Z) |
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ksort($inputs); |
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$_hash = ''; |
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// Iterate through each input |
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foreach($inputs as $name => $value) { |
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$_hash .= $name . '=' . $value; |
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} |
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// Add a salt to the hash |
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$_hash .= $config['cookies']['salt']; |
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// Use SHA1 for the hash |
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$_hash = sha1($_hash . $extra_salt); |
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return $hash != $_hash; |
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} |
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