lainchan/inc/mod.php

<?php

/*
 *  Copyright (c) 2010-2012 Tinyboard Development Group
 */

if(realpath($_SERVER['SCRIPT_FILENAME']) == str_replace('\\', '/', __FILE__)) {
	// You cannot request this file directly.
	exit;
}

// create a hash/salt pair for validate logins
function mkhash($username, $password, $salt = false) {
	global $config;
	
	if(!$salt) {
		// create some sort of salt for the hash
		$salt = substr(base64_encode(sha1(rand() . time(), true) . $config['cookies']['salt']), 0, 15);
		
		$generated_salt = true;
	}
	
	// generate hash (method is not important as long as it's strong)
	$hash = substr(base64_encode(md5($username . sha1($username . $password . $salt . ($config['mod']['lock_ip'] ? $_SERVER['REMOTE_ADDR'] : ''), true), true)), 0, 20);
	
	if(isset($generated_salt))
		return Array($hash, $salt);
	else
		return $hash;
}

function login($username, $password, $makehash=true) {
	global $mod;
	
	// SHA1 password
	if($makehash) {
		$password = sha1($password);
	}
	
	$query = prepare("SELECT `id`,`type`,`boards` FROM `mods` WHERE `username` = :username AND `password` = :password LIMIT 1");
	$query->bindValue(':username', $username);
	$query->bindValue(':password', $password);
	$query->execute() or error(db_error($query));
	
	if($user = $query->fetch()) {
		return $mod = Array(
			'id' => $user['id'],
			'type' => $user['type'],
			'username' => $username,
			'hash' => mkhash($username, $password),
			'boards' => explode(',', $user['boards'])
			);
	} else return false;
}

function setCookies() {
	global $mod, $config;
	if(!$mod)
		error('setCookies() was called for a non-moderator!');
	
	setcookie($config['cookies']['mod'],
			$mod['username'] . // username
			':' . 
			$mod['hash'][0] . // password
			':' .
			$mod['hash'][1], // salt
		time() + $config['cookies']['expire'], $config['cookies']['jail'] ? $config['cookies']['path'] : '/', null, false, true);
}

function destroyCookies() {
	global $config;
	// Delete the cookies
	setcookie($config['cookies']['mod'], 'deleted', time() - $config['cookies']['expire'], $config['cookies']['jail']?$config['cookies']['path'] : '/', null, false, true);
}

function create_pm_header() {
	global $mod;
	$query = prepare("SELECT `id` FROM `pms` WHERE `to` = :id AND `unread` = 1");
	$query->bindValue(':id', $mod['id'], PDO::PARAM_INT);
	$query->execute() or error(db_error($query));
	
	if($pm = $query->fetch()) {
		return Array('id' => $pm['id'], 'waiting' => $query->rowCount() - 1);
	}
	
	return false;
}

function modLog($action, $_board=null) {
	global $mod, $board, $config;
	$query = prepare("INSERT INTO `modlogs` VALUES (:id, :ip, :board, :time, :text)");
	$query->bindValue(':id', $mod['id'], PDO::PARAM_INT);
	$query->bindValue(':ip', $_SERVER['REMOTE_ADDR']);
	$query->bindValue(':time', time(), PDO::PARAM_INT);
	$query->bindValue(':text', $action);
	if(isset($_board))
		$query->bindValue(':board', $_board);
	elseif(isset($board))
		$query->bindValue(':board', $board['uri']);
	else
		$query->bindValue(':board', null, PDO::PARAM_NULL);
	$query->execute() or error(db_error($query));
	
	if($config['syslog'])
		_syslog(LOG_INFO, '[mod/' . $mod['username'] . ']: ' . $action);
}

// Generates a <ul> element with a list of linked
// boards and their subtitles. (without the <ul> opening and ending tags)
function ulBoards() {
	global $mod, $config;
	
	$body = '';
	
	// List of boards
	$boards = listBoards();
	
	foreach($boards as &$b) {
		$body .= '<li>' . 
			'<a href="?/' .
					sprintf($config['board_path'], $b['uri']) . $config['file_index'] .
					'">' .
				sprintf($config['board_abbreviation'], $b['uri']) .
				'</a> - ' .
				$b['title'] .
				(isset($b['subtitle']) ? '<span class="unimportant"> — ' . $b['subtitle'] . '</span>' : '') . 
					($mod['type'] >= $config['mod']['manageboards'] ?
						' <a href="?/' . $b['uri'] . '/edit" class="unimportant">[manage]</a>' : '') .
			'</li>';
	}
	
	if($mod['type'] >= $config['mod']['newboard']) {
		$body .= '<li style="margin-top:15px;"><a href="?/new"><strong>' . _('Create new board') . '</strong></a></li>';
	}
	return $body;
}

function form_newBan($ip=null, $reason='', $continue=false, $delete=false, $board=false, $allow_public = false) {
	global $config, $mod;
	
	$boards = listBoards();
	$__boards = '<li><input type="radio" checked="checked" name="board" id="board_*" value=""/> <label style="display:inline" for="board_*"><em>' . _('all boards') . '</em></label></li>';
	foreach($boards as &$_board) {
		$__boards .= '<li>' .
					'<input type="radio" name="board" id="board_' . $_board['uri'] . '" value="' . $_board['uri'] . '">' .
					'<label style="display:inline" for="board_' . $_board['uri'] . '"> ' .
						($_board['uri'] == '*' ?
							'<em>"*"</em>'
						:
							sprintf($config['board_abbreviation'], $_board['uri'])
						) .
						' - ' . $_board['title'] .
					'</label>' .
					'</li>';
	}
	
	return '<fieldset><legend>New ban</legend>' . 
				'<form action="?/ban" method="post">' . 
					($continue ? '<input type="hidden" name="continue" value="' . htmlentities($continue) . '" />' : '') .
					($delete || $allow_public ? '<input type="hidden" name="' . (!$allow_public ? 'delete' : 'post') . '" value="' . htmlentities($delete) . '" />' : '') .
					($board ? '<input type="hidden" name="board" value="' . htmlentities($board) . '" />' : '') .
					'<table>' .
					'<tr>' . 
						'<th><label for="ip">IP ' .
							($config['ban_cidr'] ? '<span class="unimportant">(or subnet)' : '') .
						'</span></label></th>' .
						'<td><input type="text" name="ip" id="ip" size="30" maxlength="30" ' . 
							(isset($ip) ?
								'value="' . htmlentities($ip) . '" ' : ''
							) .
						'/></td>' .
					'</tr>' . 
					'<tr>' . 
						'<th><label for="reason">Reason</label></th>' .
						'<td><textarea name="reason" id="reason" rows="5" cols="30">' .
							htmlentities($reason) .
						'</textarea></td>' .
					'</tr>' . 
					($mod['type'] >= $config['mod']['public_ban'] && $allow_public ?
						'<tr>' . 
							'<th><label for="message">Message</label></th>' .
							'<td><input type="checkbox" id="public_message" name="public_message"/>' .
							' <input type="text" name="message" id="message" size="35" maxlength="200" value="' . htmlentities($config['mod']['default_ban_message']) . '" />' .
							' <span class="unimportant">(public; attached to post)</span></td>' .
								'<script type="text/javascript">' . 
									'document.getElementById(\'message\').disabled = true;' .
									'document.getElementById(\'public_message\').onchange = function() {' . 
										'document.getElementById(\'message\').disabled = !this.checked;' .
									'}' . 
									
								'</script>' .
						'</tr>'
					: '') .
					'<tr>' . 
						'<th><label for="length">Length</label></th>' .
						'<td><input type="text" name="length" id="length" size="20" maxlength="40" />' .
						' <span class="unimportant">(eg. "2d1h30m" or "2 days")</span></td>' .
					'</tr>' . 
					
					'<tr>' . 
						'<th>Board</th>' .
						'<td><ul style="list-style:none;padding:2px 5px">' . $__boards . '</tl></td>' .
					'</tr>' . 
					
					'<tr>' . 
						'<td></td>' . 
						'<td><input name="new_ban" type="submit" value="New Ban" /></td>' . 
					'</tr>' . 
					'</table>' .
				'</form>' .
			'</fieldset>';
}

function form_newBoard() {
	return '<fieldset><legend>New board</legend>' . 
				'<form action="?/new" method="post">' . 
					'<table>' .
					'<tr>' . 
						'<th><label for="board">URI</label></th>' .
						'<td><input type="text" name="uri" id="board" size="10" />' .
						' <span class="unimportant">(eg. "b"; "mu")</span></td>' .
					'</tr>' . 
					'<tr>' . 
						'<th><label for="title">Title</label></th>' .
						'<td><input type="text" name="title" id="title" size="25" />' .
						' <span class="unimportant">(eg. "Random")</span></td>' .
					'</tr>' . 
					'<tr>' . 
						'<th><label for="subtitle">Subtitle</label></th>' .
						'<td><input type="text" name="subtitle" id="subtitle" size="25" />' .
						' <span class="unimportant">(optional)</span></td>' .
					'</tr>' . 
					'<tr>' . 
						'<td></td>' . 
						'<td><input name="new_board" type="submit" value="New Board" /></td>' . 
					'</tr>' . 
					'</table>' .
				'</form>' .
			'</fieldset>';
}


function removeBan($id) {
	global $config, $memcached;
	
	$query = prepare("DELETE FROM `bans` WHERE `id` = :id");
	$query->bindValue(':id', $id, PDO::PARAM_INT);
	$query->execute() or error(db_error($query));
	
	//if($config['memcached']['enabled']) {
		// Remove cached ban
		// TODO
	//	$memcached->delete("ban_{$id}");
	//}
}


// Validate session

if(isset($_COOKIE[$config['cookies']['mod']])) {
	// Should be username:hash:salt
	$cookie = explode(':', $_COOKIE[$config['cookies']['mod']]);
	if(count($cookie) != 3) {
		destroyCookies();
		error($config['error']['malformed']);
	}
	
	$query = prepare("SELECT `id`, `type`, `boards`, `password` FROM `mods` WHERE `username` = :username LIMIT 1");
	$query->bindValue(':username', $cookie[0]);
	$query->execute() or error(db_error($query));
	$user = $query->fetch();
	
	// validate password hash
	if($cookie[1] != mkhash($cookie[0], $user['password'], $cookie[2])) {
		// Malformed cookies
		destroyCookies();
		error($config['error']['malformed']);
	}
	
	$mod = Array(
		'id' => $user['id'],
		'type' => $user['type'],
		'username' => $cookie[0],
		'boards' => explode(',', $user['boards'])
	);
}