Source code of Leftypol imageboard
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298 lines
8.1 KiB

<?php
/*
* Copyright (c) 2010-2013 Tinyboard Development Group
*/
defined('TINYBOARD') or exit;
$hidden_inputs_twig = array();
$logfile = "/tmp/lainchan_err.out";
function print_err($s) {
// global $logfile;
// file_put_contents($logfile, $s . "\n", FILE_APPEND);
}
function print_err2($s) {
print_err($s);
}
print_err("\n\nSTART\n\n");
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)
$chars .= ' [email protected]#$%^&*()_+,./;\'[]\\{}|:<>?=-` ';
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('"', '&quot;', $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) {
print_err("-> " . $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) {
print_err("Hash mismatch");
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));
}