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<?php
/*
* Copyright (c) 2010-2013 Tinyboard Development Group
*/
defined('TINYBOARD') or exit;
class Filter {
public $flood_check;
private $condition;
public function __construct(array $arr) {
foreach ($arr as $key => $value)
$this->$key = $value;
}
public function match(array $post, $condition, $match) {
$condition = strtolower($condition);
switch($condition) {
case 'custom':
if (!is_callable($match))
error('Custom condition for filter is not callable!');
return $match($post);
case 'flood-match':
if (!is_array($match))
error('Filter condition "flood-match" must be an array.');
// Filter out "flood" table entries which do not match this filter.
$flood_check_matched = array();
foreach ($this->flood_check as $flood_post) {
foreach ($match as $flood_match_arg) {
switch ($flood_match_arg) {
case 'ip':
if ($flood_post['ip'] != $_SERVER['REMOTE_ADDR'])
continue 3;
break;
case 'body':
if ($flood_post['posthash'] != md5($post['body_nomarkup']))
continue 3;
break;
case 'file':
if (!isset($post['filehash']))
return false;
if ($flood_post['filehash'] != $post['filehash'])
continue 3;
break;
case 'board':
if ($flood_post['board'] != $post['board'])
continue 3;
break;
case 'isreply':
if ($flood_post['isreply'] == $post['op'])
continue 3;
break;
default:
error('Invalid filter flood condition: ' . $flood_match_arg);
}
}
$flood_check_matched[] = $flood_post;
}
$this->flood_check = $flood_check_matched;
return !empty($this->flood_check);
case 'flood-time':
foreach ($this->flood_check as $flood_post) {
if (time() - $flood_post['time'] <= $match) {
return true;
}
}
return false;
case 'name':
return preg_match($match, $post['name']);
case 'trip':
return $match === $post['trip'];
case 'email':
return preg_match($match, $post['email']);
case 'subject':
return preg_match($match, $post['subject']);
case 'body':
return preg_match($match, $post['body_nomarkup']);
case 'filename':
if (!$post['has_file'])
return false;
return preg_match($match, $post['filename']);
case 'extension':
if (!$post['has_file'])
return false;
return preg_match($match, $post['body']);
case 'ip':
return preg_match($match, $_SERVER['REMOTE_ADDR']);
case 'op':
return $post['op'] == $match;
case 'has_file':
return $post['has_file'] == $match;
default:
error('Unknown filter condition: ' . $condition);
}
}
public function action() {
global $board;
switch($this->action) {
case 'reject':
error(isset($this->message) ? $this->message : 'Posting throttled by flood filter.');
case 'ban':
if (!isset($this->reason))
error('The ban action requires a reason.');
$reason = $this->reason;
if (isset($this->expires))
$expires = time() + $this->expires;
else
$expires = 0; // Ban indefinitely
if (isset($this->reject))
$reject = $this->reject;
else
$reject = true;
if (isset($this->all_boards))
$all_boards = $this->all_boards;
else
$all_boards = false;
$query = prepare("INSERT INTO ``bans`` VALUES (NULL, :ip, :mod, :set, :expires, :reason, :board, 0)");
$query->bindValue(':ip', $_SERVER['REMOTE_ADDR']);
$query->bindValue(':mod', -1);
$query->bindValue(':set', time());
if ($expires)
$query->bindValue(':expires', $expires);
else
$query->bindValue(':expires', null, PDO::PARAM_NULL);
if ($reason)
$query->bindValue(':reason', $reason);
else
$query->bindValue(':reason', null, PDO::PARAM_NULL);
if ($all_boards)
$query->bindValue(':board', null, PDO::PARAM_NULL);
else
$query->bindValue(':board', $board['uri']);
$query->execute() or error(db_error($query));
if ($reject) {
if (isset($this->message))
error($message);
checkBan($board['uri']);
exit;
}
break;
default:
error('Unknown filter action: ' . $this->action);
}
}
public function check(array $post) {
foreach ($this->condition as $condition => $value) {
if (!$this->match($post, $condition, $value))
return false;
}
/* match */
return true;
}
}
function purge_flood_table() {
global $config;
// Determine how long we need to keep a cache of posts for flood prevention. Unfortunately, it is not
// aware of flood filters in other board configurations. You can solve this problem by settings the
// config variable $config['flood_cache'] (seconds).
if (isset($config['flood_cache'])) {
$max_time = &$config['flood_cache'];
} else {
$max_time = 0;
foreach ($config['filters'] as $filter) {
if (isset($filter['condition']['flood-time']))
$max_time = max($max_time, $filter['condition']['flood-time']);
}
}
$time = time() - $max_time;
query("DELETE FROM ``flood`` WHERE ``time`` < $time") or error(db_error());
}
function do_filters(array $post) {
global $config;
if (!isset($config['filters']) || empty($config['filters']))
return;
foreach ($config['filters'] as $filter) {
if (isset($filter['condition']['flood-match'])) {
$has_flood = true;
break;
}
}
purge_flood_table();
if (isset($has_flood)) {
if ($post['has_file']) {
$query = prepare("SELECT * FROM ``flood`` WHERE `ip` = :ip OR `posthash` = :posthash OR `filehash` = :filehash");
$query->bindValue(':ip', $_SERVER['REMOTE_ADDR']);
$query->bindValue(':posthash', md5($post['body_nomarkup']));
$query->bindValue(':filehash', $post['filehash']);
} else {
$query = prepare("SELECT * FROM ``flood`` WHERE `ip` = :ip OR `posthash` = :posthash");
$query->bindValue(':ip', $_SERVER['REMOTE_ADDR']);
$query->bindValue(':posthash', md5($post['body_nomarkup']));
}
$query->execute() or error(db_error($query));
$flood_check = $query->fetchAll(PDO::FETCH_ASSOC);
} else {
$flood_check = false;
}
foreach ($config['filters'] as $filter_array) {
$filter = new Filter($filter_array);
$filter->flood_check = $flood_check;
if ($filter->check($post))
$filter->action();
}
}
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