573 lines
17 KiB
PHP
573 lines
17 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.3.5
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*/
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namespace PrivateBin\Data;
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use Exception;
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use PrivateBin\Json;
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/**
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* Filesystem
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*
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* Model for filesystem data access, implemented as a singleton.
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*/
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class Filesystem extends AbstractData
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{
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/**
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* first line in paste or comment files, to protect their contents from browsing exposed data directories
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*
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* @const string
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*/
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const PROTECTION_LINE = '<?php http_response_code(403); /*';
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/**
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* line in generated .htaccess files, to protect exposed directories from being browsable on apache web servers
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*
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* @const string
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*/
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const HTACCESS_LINE = 'Require all denied';
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/**
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* path in which to persist something
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*
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* @access private
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* @static
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* @var string
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*/
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private static $_path = 'data';
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/**
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* get instance of singleton
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*
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* @access public
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* @static
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* @param array $options
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* @return Filesystem
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*/
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public static function getInstance(array $options)
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{
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// if needed initialize the singleton
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if (!(self::$_instance instanceof self)) {
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self::$_instance = new self;
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}
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// if given update the data directory
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if (
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is_array($options) &&
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array_key_exists('dir', $options)
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) {
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self::$_path = $options['dir'];
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}
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return self::$_instance;
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}
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/**
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* Create a paste.
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*
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* @access public
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* @param string $pasteid
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* @param array $paste
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* @return bool
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*/
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public function create($pasteid, array $paste)
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{
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$storagedir = self::_dataid2path($pasteid);
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$file = $storagedir . $pasteid . '.php';
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if (is_file($file)) {
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return false;
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}
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if (!is_dir($storagedir)) {
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mkdir($storagedir, 0700, true);
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}
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return self::_store($file, $paste);
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}
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/**
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* Read a paste.
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*
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* @access public
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* @param string $pasteid
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* @return array|false
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*/
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public function read($pasteid)
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{
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if (
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!$this->exists($pasteid) ||
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!$paste = self::_get(self::_dataid2path($pasteid) . $pasteid . '.php')
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) {
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return false;
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}
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return self::upgradePreV1Format($paste);
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}
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/**
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* Delete a paste and its discussion.
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*
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* @access public
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* @param string $pasteid
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*/
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public function delete($pasteid)
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{
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$pastedir = self::_dataid2path($pasteid);
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if (is_dir($pastedir)) {
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// Delete the paste itself.
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if (is_file($pastedir . $pasteid . '.php')) {
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unlink($pastedir . $pasteid . '.php');
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}
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// Delete discussion if it exists.
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$discdir = self::_dataid2discussionpath($pasteid);
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if (is_dir($discdir)) {
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// Delete all files in discussion directory
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read())) {
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if (is_file($discdir . $filename)) {
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unlink($discdir . $filename);
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}
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}
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$dir->close();
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rmdir($discdir);
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}
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}
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}
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/**
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* Test if a paste exists.
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*
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* @access public
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* @param string $pasteid
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* @return bool
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*/
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public function exists($pasteid)
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{
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$basePath = self::_dataid2path($pasteid) . $pasteid;
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$pastePath = $basePath . '.php';
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// convert to PHP protected files if needed
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if (is_readable($basePath)) {
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self::_prependRename($basePath, $pastePath);
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// convert comments, too
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$discdir = self::_dataid2discussionpath($pasteid);
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if (is_dir($discdir)) {
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read())) {
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if (substr($filename, -4) !== '.php' && strlen($filename) >= 16) {
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$commentFilename = $discdir . $filename . '.php';
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self::_prependRename($discdir . $filename, $commentFilename);
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}
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}
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$dir->close();
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}
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}
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return is_readable($pastePath);
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}
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/**
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* Create a comment in a paste.
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*
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* @access public
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* @param string $pasteid
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* @param string $parentid
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* @param string $commentid
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* @param array $comment
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* @return bool
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*/
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public function createComment($pasteid, $parentid, $commentid, array $comment)
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{
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$storagedir = self::_dataid2discussionpath($pasteid);
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$file = $storagedir . $pasteid . '.' . $commentid . '.' . $parentid . '.php';
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if (is_file($file)) {
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return false;
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}
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if (!is_dir($storagedir)) {
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mkdir($storagedir, 0700, true);
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}
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return self::_store($file, $comment);
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}
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/**
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* Read all comments of paste.
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*
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* @access public
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* @param string $pasteid
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* @return array
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*/
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public function readComments($pasteid)
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{
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$comments = array();
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$discdir = self::_dataid2discussionpath($pasteid);
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if (is_dir($discdir)) {
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$dir = dir($discdir);
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while (false !== ($filename = $dir->read())) {
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// Filename is in the form pasteid.commentid.parentid.php:
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// - pasteid is the paste this reply belongs to.
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// - commentid is the comment identifier itself.
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// - parentid is the comment this comment replies to (It can be pasteid)
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if (is_file($discdir . $filename)) {
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$comment = self::_get($discdir . $filename);
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$items = explode('.', $filename);
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// Add some meta information not contained in file.
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$comment['id'] = $items[1];
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$comment['parentid'] = $items[2];
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// Store in array
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$key = $this->getOpenSlot($comments, (int) $comment['meta']['created']);
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$comments[$key] = $comment;
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}
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}
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$dir->close();
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// Sort comments by date, oldest first.
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ksort($comments);
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}
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return $comments;
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}
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/**
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* Test if a comment exists.
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*
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* @access public
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* @param string $pasteid
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* @param string $parentid
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* @param string $commentid
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* @return bool
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*/
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public function existsComment($pasteid, $parentid, $commentid)
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{
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return is_file(
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self::_dataid2discussionpath($pasteid) .
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$pasteid . '.' . $commentid . '.' . $parentid . '.php'
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);
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}
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/**
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* Save a value.
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*
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* @access public
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* @param string $value
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* @param string $namespace
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* @param string $key
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* @return bool
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*/
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public function setValue($value, $namespace, $key = '')
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{
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switch ($namespace) {
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case 'purge_limiter':
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return self::_storeString(
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self::$_path . DIRECTORY_SEPARATOR . 'purge_limiter.php',
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'<?php' . PHP_EOL . '$GLOBALS[\'purge_limiter\'] = ' . $value . ';'
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);
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case 'salt':
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return self::_storeString(
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self::$_path . DIRECTORY_SEPARATOR . 'salt.php',
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'<?php # |' . $value . '|'
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);
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case 'traffic_limiter':
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self::$_last_cache[$key] = $value;
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return self::_storeString(
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self::$_path . DIRECTORY_SEPARATOR . 'traffic_limiter.php',
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'<?php' . PHP_EOL . '$GLOBALS[\'traffic_limiter\'] = ' . var_export(self::$_last_cache, true) . ';'
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);
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}
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return false;
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}
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/**
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* Load a value.
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*
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* @access public
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* @param string $namespace
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* @param string $key
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* @return string
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*/
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public function getValue($namespace, $key = '')
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{
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switch ($namespace) {
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case 'purge_limiter':
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$file = self::$_path . DIRECTORY_SEPARATOR . 'purge_limiter.php';
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if (is_readable($file)) {
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require $file;
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return $GLOBALS['purge_limiter'];
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}
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break;
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case 'salt':
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$file = self::$_path . DIRECTORY_SEPARATOR . 'salt.php';
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if (is_readable($file)) {
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$items = explode('|', file_get_contents($file));
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if (is_array($items) && count($items) == 3) {
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return $items[1];
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}
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}
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break;
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case 'traffic_limiter':
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$file = self::$_path . DIRECTORY_SEPARATOR . 'traffic_limiter.php';
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if (is_readable($file)) {
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require $file;
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self::$_last_cache = $GLOBALS['traffic_limiter'];
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if (array_key_exists($key, self::$_last_cache)) {
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return self::$_last_cache[$key];
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}
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}
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break;
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}
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return '';
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}
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/**
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* get the data
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*
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* @access public
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* @static
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* @param string $filename
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* @return array|false $data
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*/
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private static function _get($filename)
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{
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return Json::decode(
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substr(
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file_get_contents($filename),
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strlen(self::PROTECTION_LINE . PHP_EOL)
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)
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);
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}
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/**
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* Returns up to batch size number of paste ids that have expired
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*
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* @access private
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* @param int $batchsize
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* @return array
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*/
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protected function _getExpiredPastes($batchsize)
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{
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$pastes = array();
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$firstLevel = array_filter(
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scandir(self::$_path),
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'self::_isFirstLevelDir'
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);
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if (count($firstLevel) > 0) {
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// try at most 10 times the $batchsize pastes before giving up
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for ($i = 0, $max = $batchsize * 10; $i < $max; ++$i) {
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$firstKey = array_rand($firstLevel);
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$secondLevel = array_filter(
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scandir(self::$_path . DIRECTORY_SEPARATOR . $firstLevel[$firstKey]),
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'self::_isSecondLevelDir'
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);
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// skip this folder in the next checks if it is empty
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if (count($secondLevel) == 0) {
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unset($firstLevel[$firstKey]);
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continue;
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}
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$secondKey = array_rand($secondLevel);
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$path = self::$_path . DIRECTORY_SEPARATOR .
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$firstLevel[$firstKey] . DIRECTORY_SEPARATOR .
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$secondLevel[$secondKey];
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if (!is_dir($path)) {
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continue;
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}
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$thirdLevel = array_filter(
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array_map(
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function ($filename) {
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return strlen($filename) >= 20 ?
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substr($filename, 0, -4) :
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$filename;
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},
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scandir($path)
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),
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'PrivateBin\\Model\\Paste::isValidId'
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);
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if (count($thirdLevel) == 0) {
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continue;
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}
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$thirdKey = array_rand($thirdLevel);
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$pasteid = $thirdLevel[$thirdKey];
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if (in_array($pasteid, $pastes)) {
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continue;
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}
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if ($this->exists($pasteid)) {
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$data = $this->read($pasteid);
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if (
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array_key_exists('expire_date', $data['meta']) &&
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$data['meta']['expire_date'] < time()
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) {
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$pastes[] = $pasteid;
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if (count($pastes) >= $batchsize) {
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break;
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}
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}
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}
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}
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}
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return $pastes;
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}
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/**
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* Convert paste id to storage path.
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*
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* The idea is to creates subdirectories in order to limit the number of files per directory.
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* (A high number of files in a single directory can slow things down.)
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* eg. "f468483c313401e8" will be stored in "data/f4/68/f468483c313401e8"
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* High-trafic websites may want to deepen the directory structure (like Squid does).
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*
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* eg. input 'e3570978f9e4aa90' --> output 'data/e3/57/'
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*
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* @access private
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* @static
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* @param string $dataid
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* @return string
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*/
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private static function _dataid2path($dataid)
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{
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return self::$_path . DIRECTORY_SEPARATOR .
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substr($dataid, 0, 2) . DIRECTORY_SEPARATOR .
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substr($dataid, 2, 2) . DIRECTORY_SEPARATOR;
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}
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/**
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* Convert paste id to discussion storage path.
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*
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* eg. input 'e3570978f9e4aa90' --> output 'data/e3/57/e3570978f9e4aa90.discussion/'
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*
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* @access private
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* @static
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* @param string $dataid
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* @return string
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*/
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private static function _dataid2discussionpath($dataid)
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{
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return self::_dataid2path($dataid) . $dataid .
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'.discussion' . DIRECTORY_SEPARATOR;
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}
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/**
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* Check that the given element is a valid first level directory.
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*
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* @access private
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* @static
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* @param string $element
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* @return bool
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*/
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private static function _isFirstLevelDir($element)
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{
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return self::_isSecondLevelDir($element) &&
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is_dir(self::$_path . DIRECTORY_SEPARATOR . $element);
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}
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/**
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* Check that the given element is a valid second level directory.
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*
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* @access private
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* @static
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* @param string $element
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* @return bool
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*/
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private static function _isSecondLevelDir($element)
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{
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return (bool) preg_match('/^[a-f0-9]{2}$/', $element);
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}
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/**
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* store the data
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*
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* @access public
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* @static
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* @param string $filename
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* @param array $data
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* @return bool
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*/
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private static function _store($filename, array $data)
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{
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try {
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return self::_storeString(
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$filename,
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self::PROTECTION_LINE . PHP_EOL . Json::encode($data)
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);
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} catch (Exception $e) {
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return false;
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}
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}
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/**
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* store a string
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*
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* @access public
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* @static
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* @param string $filename
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* @param string $data
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* @return bool
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*/
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private static function _storeString($filename, $data)
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{
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// Create storage directory if it does not exist.
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if (!is_dir(self::$_path)) {
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if (!@mkdir(self::$_path, 0700)) {
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return false;
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}
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}
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$file = self::$_path . DIRECTORY_SEPARATOR . '.htaccess';
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if (!is_file($file)) {
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$writtenBytes = 0;
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if ($fileCreated = @touch($file)) {
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$writtenBytes = @file_put_contents(
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$file,
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self::HTACCESS_LINE . PHP_EOL,
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LOCK_EX
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);
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}
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if (
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$fileCreated === false ||
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$writtenBytes === false ||
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$writtenBytes < strlen(self::HTACCESS_LINE . PHP_EOL)
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) {
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return false;
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}
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}
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$fileCreated = true;
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$writtenBytes = 0;
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if (!is_file($filename)) {
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$fileCreated = @touch($filename);
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}
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if ($fileCreated) {
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$writtenBytes = @file_put_contents($filename, $data, LOCK_EX);
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}
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if ($fileCreated === false || $writtenBytes === false || $writtenBytes < strlen($data)) {
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return false;
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}
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@chmod($filename, 0640); // protect file from access by other users on the host
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return true;
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}
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/**
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* rename a file, prepending the protection line at the beginning
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*
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* @access public
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* @static
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* @param string $srcFile
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* @param string $destFile
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* @return void
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*/
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private static function _prependRename($srcFile, $destFile)
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{
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// don't overwrite already converted file
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if (!is_readable($destFile)) {
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$handle = fopen($srcFile, 'r', false, stream_context_create());
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file_put_contents($destFile, self::PROTECTION_LINE . PHP_EOL);
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file_put_contents($destFile, $handle, FILE_APPEND);
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fclose($handle);
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}
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unlink($srcFile);
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}
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}
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