283 lines
7.8 KiB
PHP
283 lines
7.8 KiB
PHP
<?php
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/*
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* Copyright (c) 2010-2013 Tinyboard Development Group
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*/
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defined('TINYBOARD') or exit;
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$hidden_inputs_twig = array();
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class AntiBot {
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public $salt, $inputs = array(), $index = 0;
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public static function randomString($length, $uppercase = false, $special_chars = false, $unicode_chars = false) {
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$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 .= ' ~!@#$%^&*()_+,./;\'[]\\{}|:<>?=-` ';
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if ($unicode_chars) {
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$len = strlen($chars) / 10;
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for ($n = 0; $n < $len; $n++)
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$chars .= mb_convert_encoding('&#' . mt_rand(0x2600, 0x26FF) . ';', 'UTF-8', 'HTML-ENTITIES');
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}
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$chars = preg_split('//u', $chars, -1, PREG_SPLIT_NO_EMPTY);
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$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 = preg_split('//u', $string, -1, PREG_SPLIT_NO_EMPTY);
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foreach ($chars as &$c) {
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if (mt_rand(0, 3) != 0)
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$c = utf8tohtml($c);
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else
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$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 = mt_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 || mt_rand(0, 2) == 0) {
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// Use an obscure name
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$name = $this->randomString(mt_rand(10, 40), false, false, $config['spam']['unicode']);
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} else {
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// Use a pre-defined confusing name
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$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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$hidden_input_names_x = false;
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}
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if (mt_rand(0, 2) == 0) {
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// Value must be null
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$this->inputs[$name] = '';
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} elseif (mt_rand(0, 4) == 0) {
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// Numeric value
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$this->inputs[$name] = (string)mt_rand(0, 100000);
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} else {
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// Obscure value
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$this->inputs[$name] = $this->randomString(mt_rand(5, 100), true, true, $config['spam']['unicode']);
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}
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}
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}
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public static function space() {
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if (mt_rand(0, 3) != 0)
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return ' ';
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return str_repeat(' ', mt_rand(1, 3));
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}
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public function html($count = false) {
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global $config;
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$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 name="%name%" value="%value%" type="hidden">',
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'<input value="%value%" name="%name%" type="hidden">',
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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 === false) {
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$count = mt_rand(1, abs(count($this->inputs) / 15) + 1);
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}
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if ($count === true) {
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// all elements
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$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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$element = str_replace(' ', self::space(), $element);
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if (mt_rand(0, 5) == 0)
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$element = str_replace('>', self::space() . '>', $element);
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if (strpos($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), $element);
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if (mt_rand(0, 2) == 0)
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$value = $this->make_confusing($value);
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else
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$value = utf8tohtml($value);
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if (strpos($element, 'textarea') === false)
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$value = str_replace('"', '"', $value);
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$element = str_replace('%value%', $value, $element);
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$html .= $element;
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}
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return $html;
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}
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public function reset() {
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$this->index = 0;
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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 . $this->salt);
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}
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}
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function _create_antibot($board, $thread) {
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global $config, $purged_old_antispam;
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$antibot = new AntiBot(array($board, $thread));
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if (!isset($purged_old_antispam)) {
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$purged_old_antispam = true;
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query('DELETE FROM ``antispam`` WHERE `expires` < UNIX_TIMESTAMP()') or error(db_error());
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}
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if ($thread)
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$query = prepare('UPDATE ``antispam`` SET `expires` = UNIX_TIMESTAMP() + :expires WHERE `board` = :board AND `thread` = :thread AND `expires` IS NULL');
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else
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$query = prepare('UPDATE ``antispam`` SET `expires` = UNIX_TIMESTAMP() + :expires WHERE `board` = :board AND `thread` IS NULL AND `expires` IS NULL');
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$query->bindValue(':board', $board);
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if ($thread)
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$query->bindValue(':thread', $thread);
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$query->bindValue(':expires', $config['spam']['hidden_inputs_expire']);
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$query->execute() or error(db_error($query));
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$query = prepare('INSERT INTO ``antispam`` VALUES (:board, :thread, :hash, UNIX_TIMESTAMP(), NULL, 0)');
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$query->bindValue(':board', $board);
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$query->bindValue(':thread', $thread);
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$query->bindValue(':hash', $antibot->hash());
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$query->execute() or error(db_error($query));
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return $antibot;
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}
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function checkSpam(array $extra_salt = array()) {
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global $config, $pdo;
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if (!isset($_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 . $extra_salt);
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if ($hash != $_hash)
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return true;
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$query = prepare('SELECT `passed` FROM ``antispam`` WHERE `hash` = :hash');
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$query->bindValue(':hash', $hash);
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$query->execute() or error(db_error($query));
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if ((($passed = $query->fetchColumn(0)) === false) || ($passed > $config['spam']['hidden_inputs_max_pass'])) {
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// there was no database entry for this hash. most likely expired.
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return true;
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}
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return $hash;
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}
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function incrementSpamHash($hash) {
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$query = prepare('UPDATE ``antispam`` SET `passed` = `passed` + 1 WHERE `hash` = :hash');
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$query->bindValue(':hash', $hash);
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$query->execute() or error(db_error($query));
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}
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