mirror of
https://github.com/vichan-devel/vichan.git
synced 2024-12-18 02:16:03 +01:00
283 lines
7.8 KiB
PHP
283 lines
7.8 KiB
PHP
<?php
|
|
|
|
/*
|
|
* Copyright (c) 2010-2013 Tinyboard Development Group
|
|
*/
|
|
|
|
defined('TINYBOARD') or exit;
|
|
|
|
$hidden_inputs_twig = array();
|
|
|
|
class AntiBot {
|
|
public $salt, $inputs = array(), $index = 0;
|
|
|
|
public static function randomString($length, $uppercase = false, $special_chars = false, $unicode_chars = false) {
|
|
$chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
|
|
if ($uppercase)
|
|
$chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
|
|
if ($special_chars)
|
|
$chars .= ' ~!@#$%^&*()_+,./;\'[]\\{}|:<>?=-` ';
|
|
if ($unicode_chars) {
|
|
$len = strlen($chars) / 10;
|
|
for ($n = 0; $n < $len; $n++)
|
|
$chars .= mb_convert_encoding('&#' . mt_rand(0x2600, 0x26FF) . ';', 'UTF-8', 'HTML-ENTITIES');
|
|
}
|
|
|
|
$chars = preg_split('//u', $chars, -1, PREG_SPLIT_NO_EMPTY);
|
|
|
|
$ch = array();
|
|
|
|
// fill up $ch until we reach $length
|
|
while (count($ch) < $length) {
|
|
$n = $length - count($ch);
|
|
$keys = array_rand($chars, $n > count($chars) ? count($chars) : $n);
|
|
if ($n == 1) {
|
|
$ch[] = $chars[$keys];
|
|
break;
|
|
}
|
|
shuffle($keys);
|
|
foreach ($keys as $key)
|
|
$ch[] = $chars[$key];
|
|
}
|
|
|
|
$chars = $ch;
|
|
|
|
return implode('', $chars);
|
|
}
|
|
|
|
public static function make_confusing($string) {
|
|
$chars = preg_split('//u', $string, -1, PREG_SPLIT_NO_EMPTY);
|
|
|
|
foreach ($chars as &$c) {
|
|
if (mt_rand(0, 3) != 0)
|
|
$c = utf8tohtml($c);
|
|
else
|
|
$c = mb_encode_numericentity($c, array(0, 0xffff, 0, 0xffff), 'UTF-8');
|
|
}
|
|
|
|
return implode('', $chars);
|
|
}
|
|
|
|
public function __construct(array $salt = array()) {
|
|
global $config;
|
|
|
|
if (!empty($salt)) {
|
|
// create a salted hash of the "extra salt"
|
|
$this->salt = implode(':', $salt);
|
|
} else {
|
|
$this->salt = '';
|
|
}
|
|
|
|
shuffle($config['spam']['hidden_input_names']);
|
|
|
|
$input_count = mt_rand($config['spam']['hidden_inputs_min'], $config['spam']['hidden_inputs_max']);
|
|
$hidden_input_names_x = 0;
|
|
|
|
for ($x = 0; $x < $input_count ; $x++) {
|
|
if ($hidden_input_names_x === false || mt_rand(0, 2) == 0) {
|
|
// Use an obscure name
|
|
$name = $this->randomString(mt_rand(10, 40), false, false, $config['spam']['unicode']);
|
|
} else {
|
|
// Use a pre-defined confusing name
|
|
$name = $config['spam']['hidden_input_names'][$hidden_input_names_x++];
|
|
if ($hidden_input_names_x >= count($config['spam']['hidden_input_names']))
|
|
$hidden_input_names_x = false;
|
|
}
|
|
|
|
if (mt_rand(0, 2) == 0) {
|
|
// Value must be null
|
|
$this->inputs[$name] = '';
|
|
} elseif (mt_rand(0, 4) == 0) {
|
|
// Numeric value
|
|
$this->inputs[$name] = (string)mt_rand(0, 100000);
|
|
} else {
|
|
// Obscure value
|
|
$this->inputs[$name] = $this->randomString(mt_rand(5, 100), true, true, $config['spam']['unicode']);
|
|
}
|
|
}
|
|
}
|
|
|
|
public static function space() {
|
|
if (mt_rand(0, 3) != 0)
|
|
return ' ';
|
|
return str_repeat(' ', mt_rand(1, 3));
|
|
}
|
|
|
|
public function html($count = false) {
|
|
global $config;
|
|
|
|
$elements = array(
|
|
'<input type="hidden" name="%name%" value="%value%">',
|
|
'<input type="hidden" value="%value%" name="%name%">',
|
|
'<input name="%name%" value="%value%" type="hidden">',
|
|
'<input value="%value%" name="%name%" type="hidden">',
|
|
'<input style="display:none" type="text" name="%name%" value="%value%">',
|
|
'<input style="display:none" type="text" value="%value%" name="%name%">',
|
|
'<span style="display:none"><input type="text" name="%name%" value="%value%"></span>',
|
|
'<div style="display:none"><input type="text" name="%name%" value="%value%"></div>',
|
|
'<div style="display:none"><input type="text" name="%name%" value="%value%"></div>',
|
|
'<textarea style="display:none" name="%name%">%value%</textarea>',
|
|
'<textarea name="%name%" style="display:none">%value%</textarea>'
|
|
);
|
|
|
|
$html = '';
|
|
|
|
if ($count === false) {
|
|
$count = mt_rand(1, abs(count($this->inputs) / 15) + 1);
|
|
}
|
|
|
|
if ($count === true) {
|
|
// all elements
|
|
$inputs = array_slice($this->inputs, $this->index);
|
|
} else {
|
|
$inputs = array_slice($this->inputs, $this->index, $count);
|
|
}
|
|
$this->index += count($inputs);
|
|
|
|
foreach ($inputs as $name => $value) {
|
|
$element = false;
|
|
while (!$element) {
|
|
$element = $elements[array_rand($elements)];
|
|
$element = str_replace(' ', self::space(), $element);
|
|
if (mt_rand(0, 5) == 0)
|
|
$element = str_replace('>', self::space() . '>', $element);
|
|
if (strpos($element, 'textarea') !== false && $value == '') {
|
|
// There have been some issues with mobile web browsers and empty <textarea>'s.
|
|
$element = false;
|
|
}
|
|
}
|
|
|
|
$element = str_replace('%name%', utf8tohtml($name), $element);
|
|
|
|
if (mt_rand(0, 2) == 0)
|
|
$value = $this->make_confusing($value);
|
|
else
|
|
$value = utf8tohtml($value);
|
|
|
|
if (strpos($element, 'textarea') === false)
|
|
$value = str_replace('"', '"', $value);
|
|
|
|
$element = str_replace('%value%', $value, $element);
|
|
|
|
$html .= $element;
|
|
}
|
|
|
|
return $html;
|
|
}
|
|
|
|
public function reset() {
|
|
$this->index = 0;
|
|
}
|
|
|
|
public function hash() {
|
|
global $config;
|
|
|
|
// This is the tricky part: create a hash to validate it after
|
|
// First, sort the keys in alphabetical order (A-Z)
|
|
$inputs = $this->inputs;
|
|
ksort($inputs);
|
|
|
|
$hash = '';
|
|
// Iterate through each input
|
|
foreach ($inputs as $name => $value) {
|
|
$hash .= $name . '=' . $value;
|
|
}
|
|
// Add a salt to the hash
|
|
$hash .= $config['cookies']['salt'];
|
|
|
|
// Use SHA1 for the hash
|
|
return sha1($hash . $this->salt);
|
|
}
|
|
}
|
|
|
|
function _create_antibot($board, $thread) {
|
|
global $config, $purged_old_antispam;
|
|
|
|
$antibot = new AntiBot(array($board, $thread));
|
|
|
|
if (!isset($purged_old_antispam)) {
|
|
$purged_old_antispam = true;
|
|
query('DELETE FROM ``antispam`` WHERE `expires` < UNIX_TIMESTAMP()') or error(db_error());
|
|
}
|
|
|
|
if ($thread)
|
|
$query = prepare('UPDATE ``antispam`` SET `expires` = UNIX_TIMESTAMP() + :expires WHERE `board` = :board AND `thread` = :thread AND `expires` IS NULL');
|
|
else
|
|
$query = prepare('UPDATE ``antispam`` SET `expires` = UNIX_TIMESTAMP() + :expires WHERE `board` = :board AND `thread` IS NULL AND `expires` IS NULL');
|
|
|
|
$query->bindValue(':board', $board);
|
|
if ($thread)
|
|
$query->bindValue(':thread', $thread);
|
|
$query->bindValue(':expires', $config['spam']['hidden_inputs_expire']);
|
|
$query->execute() or error(db_error($query));
|
|
|
|
$query = prepare('INSERT INTO ``antispam`` VALUES (:board, :thread, :hash, UNIX_TIMESTAMP(), NULL, 0)');
|
|
$query->bindValue(':board', $board);
|
|
$query->bindValue(':thread', $thread);
|
|
$query->bindValue(':hash', $antibot->hash());
|
|
$query->execute() or error(db_error($query));
|
|
|
|
return $antibot;
|
|
}
|
|
|
|
function checkSpam(array $extra_salt = array()) {
|
|
global $config, $pdo;
|
|
|
|
if (!isset($_POST['hash']))
|
|
return true;
|
|
|
|
$hash = $_POST['hash'];
|
|
|
|
if (!empty($extra_salt)) {
|
|
// create a salted hash of the "extra salt"
|
|
$extra_salt = implode(':', $extra_salt);
|
|
} else {
|
|
$extra_salt = '';
|
|
}
|
|
|
|
// Reconsturct the $inputs array
|
|
$inputs = array();
|
|
|
|
foreach ($_POST as $name => $value) {
|
|
if (in_array($name, $config['spam']['valid_inputs']))
|
|
continue;
|
|
|
|
$inputs[$name] = $value;
|
|
}
|
|
|
|
// Sort the inputs in alphabetical order (A-Z)
|
|
ksort($inputs);
|
|
|
|
$_hash = '';
|
|
|
|
// Iterate through each input
|
|
foreach ($inputs as $name => $value) {
|
|
$_hash .= $name . '=' . $value;
|
|
}
|
|
|
|
// Add a salt to the hash
|
|
$_hash .= $config['cookies']['salt'];
|
|
|
|
// Use SHA1 for the hash
|
|
$_hash = sha1($_hash . $extra_salt);
|
|
|
|
if ($hash != $_hash)
|
|
return true;
|
|
|
|
$query = prepare('SELECT `passed` FROM ``antispam`` WHERE `hash` = :hash');
|
|
$query->bindValue(':hash', $hash);
|
|
$query->execute() or error(db_error($query));
|
|
if ((($passed = $query->fetchColumn(0)) === false) || ($passed > $config['spam']['hidden_inputs_max_pass'])) {
|
|
// there was no database entry for this hash. most likely expired.
|
|
return true;
|
|
}
|
|
|
|
return $hash;
|
|
}
|
|
|
|
function incrementSpamHash($hash) {
|
|
$query = prepare('UPDATE ``antispam`` SET `passed` = `passed` + 1 WHERE `hash` = :hash');
|
|
$query->bindValue(':hash', $hash);
|
|
$query->execute() or error(db_error($query));
|
|
}
|