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<?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 1.4.0 |
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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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* @var string |
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*/ |
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private $_path = 'data'; |
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/** |
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* instantiates a new Filesystem data backend |
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* |
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* @access public |
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* @param array $options |
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* @return |
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*/ |
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public function __construct(array $options) |
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{ |
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// if given update the data directory |
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if ( |
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is_array($options) && |
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array_key_exists('dir', $options) |
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) { |
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$this->_path = $options['dir']; |
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} |
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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 = $this->_dataid2path($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 $this->_store($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 = $this->_get($this->_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 = $this->_dataid2path($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 = $this->_dataid2discussionpath($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 = $this->_dataid2path($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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$this->_prependRename($basePath, $pastePath); |
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// convert comments, too |
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$discdir = $this->_dataid2discussionpath($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 . $filename . '.php'; |
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$this->_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 = $this->_dataid2discussionpath($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 $this->_store($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 = $this->_dataid2discussionpath($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 = $this->_get($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, $commentid) |
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{ |
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return is_file( |
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$this->_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 $this->_storeString( |
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$this->_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 $this->_storeString( |
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$this->_path . DIRECTORY_SEPARATOR . 'salt.php', |
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'<?php # |' . $value . '|' |
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); |
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case 'traffic_limiter': |
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$this->_last_cache[$key] = $value; |
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return $this->_storeString( |
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$this->_path . DIRECTORY_SEPARATOR . 'traffic_limiter.php', |
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6 |
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'<?php' . PHP_EOL . '$GLOBALS[\'traffic_limiter\'] = ' . var_export($this->_last_cache, true) . ';' |
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); |
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} |
273
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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 $key |
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* @return string |
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*/ |
284
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27 |
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public function getValue($namespace, $key = '') |
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{ |
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27 |
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switch ($namespace) { |
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27 |
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case 'purge_limiter': |
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13 |
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$file = $this->_path . DIRECTORY_SEPARATOR . 'purge_limiter.php'; |
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if (is_readable($file)) { |
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require $file; |
291
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1 |
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return $GLOBALS['purge_limiter']; |
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} |
293
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13 |
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break; |
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17 |
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case 'salt': |
295
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17 |
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$file = $this->_path . DIRECTORY_SEPARATOR . 'salt.php'; |
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17 |
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if (is_readable($file)) { |
297
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3 |
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$items = explode('|', file_get_contents($file)); |
298
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3 |
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if (is_array($items) && count($items) == 3) { |
299
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3 |
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return $items[1]; |
300
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} |
301
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} |
302
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17 |
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break; |
303
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6 |
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case 'traffic_limiter': |
304
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6 |
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$file = $this->_path . DIRECTORY_SEPARATOR . 'traffic_limiter.php'; |
305
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6 |
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if (is_readable($file)) { |
306
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3 |
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require $file; |
307
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3 |
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$this->_last_cache = $GLOBALS['traffic_limiter']; |
308
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3 |
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if (array_key_exists($key, $this->_last_cache)) { |
309
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3 |
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return $this->_last_cache[$key]; |
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} |
311
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} |
312
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6 |
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break; |
313
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} |
314
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27 |
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return ''; |
315
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} |
316
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317
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/** |
318
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* get the data |
319
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* |
320
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* @access public |
321
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* @param string $filename |
322
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* @return array|false $data |
323
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*/ |
324
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29 |
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private function _get($filename) |
325
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{ |
326
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29 |
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return Json::decode( |
327
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29 |
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substr( |
328
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29 |
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file_get_contents($filename), |
329
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29 |
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strlen(self::PROTECTION_LINE . PHP_EOL) |
330
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) |
331
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); |
332
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} |
333
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|
334
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/** |
335
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* Returns up to batch size number of paste ids that have expired |
336
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* |
337
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* @access private |
338
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* @param int $batchsize |
339
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* @return array |
340
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*/ |
341
|
14 |
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protected function _getExpiredPastes($batchsize) |
342
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{ |
343
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14 |
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$pastes = array(); |
344
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14 |
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$firstLevel = array_filter( |
345
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14 |
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scandir($this->_path), |
346
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14 |
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'PrivateBin\Data\Filesystem::_isFirstLevelDir' |
347
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); |
348
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14 |
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if (count($firstLevel) > 0) { |
349
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// try at most 10 times the $batchsize pastes before giving up |
350
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3 |
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for ($i = 0, $max = $batchsize * 10; $i < $max; ++$i) { |
351
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3 |
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$firstKey = array_rand($firstLevel); |
352
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3 |
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$secondLevel = array_filter( |
353
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3 |
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scandir($this->_path . DIRECTORY_SEPARATOR . $firstLevel[$firstKey]), |
354
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3 |
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'PrivateBin\Data\Filesystem::_isSecondLevelDir' |
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); |
356
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|
357
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// skip this folder in the next checks if it is empty |
358
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3 |
|
if (count($secondLevel) == 0) { |
359
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1 |
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unset($firstLevel[$firstKey]); |
360
|
1 |
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continue; |
361
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} |
362
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|
363
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3 |
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$secondKey = array_rand($secondLevel); |
364
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3 |
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$path = $this->_path . DIRECTORY_SEPARATOR . |
365
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3 |
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$firstLevel[$firstKey] . DIRECTORY_SEPARATOR . |
366
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3 |
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$secondLevel[$secondKey]; |
367
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3 |
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if (!is_dir($path)) { |
368
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continue; |
369
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} |
370
|
3 |
|
$thirdLevel = array_filter( |
371
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3 |
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array_map( |
372
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3 |
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function ($filename) { |
373
|
3 |
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return strlen($filename) >= 20 ? |
374
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3 |
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substr($filename, 0, -4) : |
375
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3 |
|
$filename; |
376
|
3 |
|
}, |
377
|
3 |
|
scandir($path) |
378
|
|
|
), |
379
|
3 |
|
'PrivateBin\\Model\\Paste::isValidId' |
380
|
|
|
); |
381
|
3 |
|
if (count($thirdLevel) == 0) { |
382
|
|
|
continue; |
383
|
|
|
} |
384
|
3 |
|
$thirdKey = array_rand($thirdLevel); |
385
|
3 |
|
$pasteid = $thirdLevel[$thirdKey]; |
386
|
3 |
|
if (in_array($pasteid, $pastes)) { |
387
|
1 |
|
continue; |
388
|
|
|
} |
389
|
|
|
|
390
|
3 |
|
if ($this->exists($pasteid)) { |
391
|
3 |
|
$data = $this->read($pasteid); |
392
|
|
|
if ( |
393
|
3 |
|
array_key_exists('expire_date', $data['meta']) && |
394
|
3 |
|
$data['meta']['expire_date'] < time() |
395
|
|
|
) { |
396
|
1 |
|
$pastes[] = $pasteid; |
397
|
1 |
|
if (count($pastes) >= $batchsize) { |
398
|
|
|
break; |
399
|
|
|
} |
400
|
|
|
} |
401
|
|
|
} |
402
|
|
|
} |
403
|
|
|
} |
404
|
14 |
|
return $pastes; |
405
|
|
|
} |
406
|
|
|
|
407
|
|
|
/** |
408
|
|
|
* @inheritDoc |
409
|
|
|
*/ |
410
|
|
|
public function getAllPastes() |
411
|
|
|
{ |
412
|
|
|
$pastes = array(); |
413
|
|
|
$subdirs = scandir($this->_path); |
414
|
|
|
if ($subdirs === false) { |
415
|
|
|
dieerr('Unable to list directory ' . $this->_path); |
416
|
|
|
} |
417
|
|
|
$subdirs = preg_grep('/^[^.].$/', $subdirs); |
418
|
|
|
|
419
|
|
|
foreach ($subdirs as $subdir) { |
420
|
|
|
$subpath = $this->_path . DIRECTORY_SEPARATOR . $subdir; |
421
|
|
|
|
422
|
|
|
$subsubdirs = scandir($subpath); |
423
|
|
|
if ($subsubdirs === false) { |
424
|
|
|
dieerr('Unable to list directory ' . $subpath); |
425
|
|
|
} |
426
|
|
|
$subsubdirs = preg_grep('/^[^.].$/', $subsubdirs); |
427
|
|
|
foreach ($subsubdirs as $subsubdir) { |
428
|
|
|
$subsubpath = $subpath . DIRECTORY_SEPARATOR . $subsubdir; |
429
|
|
|
|
430
|
|
|
$files = scandir($subsubpath); |
431
|
|
|
if ($files === false) { |
432
|
|
|
dieerr('Unable to list directory ' . $subsubpath); |
433
|
|
|
} |
434
|
|
|
$files = preg_grep('/\.php$/', $files); |
435
|
|
|
|
436
|
|
|
foreach ($files as $file) { |
437
|
|
|
if (substr($file, 0, 4) === $subdir . $subsubdir) { |
438
|
|
|
$pastes[] = substr($file, 0, strlen($file) - 4); |
439
|
|
|
} |
440
|
|
|
} |
441
|
|
|
} |
442
|
|
|
} |
443
|
|
|
|
444
|
|
|
return $pastes; |
445
|
|
|
} |
446
|
|
|
|
447
|
|
|
/** |
448
|
|
|
* Convert paste id to storage path. |
449
|
|
|
* |
450
|
|
|
* The idea is to creates subdirectories in order to limit the number of files per directory. |
451
|
|
|
* (A high number of files in a single directory can slow things down.) |
452
|
|
|
* eg. "f468483c313401e8" will be stored in "data/f4/68/f468483c313401e8" |
453
|
|
|
* High-trafic websites may want to deepen the directory structure (like Squid does). |
454
|
|
|
* |
455
|
|
|
* eg. input 'e3570978f9e4aa90' --> output 'data/e3/57/' |
456
|
|
|
* |
457
|
|
|
* @access private |
458
|
|
|
* @param string $dataid |
459
|
|
|
* @return string |
460
|
|
|
*/ |
461
|
55 |
|
private function _dataid2path($dataid) |
462
|
|
|
{ |
463
|
55 |
|
return $this->_path . DIRECTORY_SEPARATOR . |
464
|
55 |
|
substr($dataid, 0, 2) . DIRECTORY_SEPARATOR . |
465
|
55 |
|
substr($dataid, 2, 2) . DIRECTORY_SEPARATOR; |
466
|
|
|
} |
467
|
|
|
|
468
|
|
|
/** |
469
|
|
|
* Convert paste id to discussion storage path. |
470
|
|
|
* |
471
|
|
|
* eg. input 'e3570978f9e4aa90' --> output 'data/e3/57/e3570978f9e4aa90.discussion/' |
472
|
|
|
* |
473
|
|
|
* @access private |
474
|
|
|
* @param string $dataid |
475
|
|
|
* @return string |
476
|
|
|
*/ |
477
|
23 |
|
private function _dataid2discussionpath($dataid) |
478
|
|
|
{ |
479
|
23 |
|
return $this->_dataid2path($dataid) . $dataid . |
480
|
23 |
|
'.discussion' . DIRECTORY_SEPARATOR; |
481
|
|
|
} |
482
|
|
|
|
483
|
|
|
/** |
484
|
|
|
* Check that the given element is a valid first level directory. |
485
|
|
|
* |
486
|
|
|
* @access private |
487
|
|
|
* @param string $element |
488
|
|
|
* @return bool |
489
|
|
|
*/ |
490
|
14 |
|
private function _isFirstLevelDir($element) |
491
|
|
|
{ |
492
|
14 |
|
return $this->_isSecondLevelDir($element) && |
493
|
14 |
|
is_dir($this->_path . DIRECTORY_SEPARATOR . $element); |
494
|
|
|
} |
495
|
|
|
|
496
|
|
|
/** |
497
|
|
|
* Check that the given element is a valid second level directory. |
498
|
|
|
* |
499
|
|
|
* @access private |
500
|
|
|
* @param string $element |
501
|
|
|
* @return bool |
502
|
|
|
*/ |
503
|
14 |
|
private function _isSecondLevelDir($element) |
504
|
|
|
{ |
505
|
14 |
|
return (bool) preg_match('/^[a-f0-9]{2}$/', $element); |
506
|
|
|
} |
507
|
|
|
|
508
|
|
|
/** |
509
|
|
|
* store the data |
510
|
|
|
* |
511
|
|
|
* @access public |
512
|
|
|
* @param string $filename |
513
|
|
|
* @param array $data |
514
|
|
|
* @return bool |
515
|
|
|
*/ |
516
|
33 |
|
private function _store($filename, array $data) |
517
|
|
|
{ |
518
|
|
|
try { |
519
|
33 |
|
return $this->_storeString( |
520
|
33 |
|
$filename, |
521
|
33 |
|
self::PROTECTION_LINE . PHP_EOL . Json::encode($data) |
522
|
|
|
); |
523
|
2 |
|
} catch (Exception $e) { |
524
|
2 |
|
return false; |
525
|
|
|
} |
526
|
|
|
} |
527
|
|
|
|
528
|
|
|
/** |
529
|
|
|
* store a string |
530
|
|
|
* |
531
|
|
|
* @access public |
532
|
|
|
* @param string $filename |
533
|
|
|
* @param string $data |
534
|
|
|
* @return bool |
535
|
|
|
*/ |
536
|
44 |
|
private function _storeString($filename, $data) |
537
|
|
|
{ |
538
|
|
|
// Create storage directory if it does not exist. |
539
|
44 |
|
if (!is_dir($this->_path)) { |
540
|
14 |
|
if (!@mkdir($this->_path, 0700)) { |
541
|
|
|
return false; |
542
|
|
|
} |
543
|
|
|
} |
544
|
44 |
|
$file = $this->_path . DIRECTORY_SEPARATOR . '.htaccess'; |
545
|
44 |
|
if (!is_file($file)) { |
546
|
43 |
|
$writtenBytes = 0; |
547
|
43 |
|
if ($fileCreated = @touch($file)) { |
548
|
41 |
|
$writtenBytes = @file_put_contents( |
549
|
41 |
|
$file, |
550
|
41 |
|
self::HTACCESS_LINE . PHP_EOL, |
551
|
41 |
|
LOCK_EX |
552
|
|
|
); |
553
|
|
|
} |
554
|
|
|
if ( |
555
|
43 |
|
$fileCreated === false || |
556
|
41 |
|
$writtenBytes === false || |
557
|
43 |
|
$writtenBytes < strlen(self::HTACCESS_LINE . PHP_EOL) |
558
|
|
|
) { |
559
|
2 |
|
return false; |
560
|
|
|
} |
561
|
|
|
} |
562
|
|
|
|
563
|
42 |
|
$fileCreated = true; |
564
|
42 |
|
$writtenBytes = 0; |
565
|
42 |
|
if (!is_file($filename)) { |
566
|
41 |
|
$fileCreated = @touch($filename); |
567
|
|
|
} |
568
|
42 |
|
if ($fileCreated) { |
569
|
41 |
|
$writtenBytes = @file_put_contents($filename, $data, LOCK_EX); |
570
|
|
|
} |
571
|
42 |
|
if ($fileCreated === false || $writtenBytes === false || $writtenBytes < strlen($data)) { |
572
|
2 |
|
return false; |
573
|
|
|
} |
574
|
40 |
|
@chmod($filename, 0640); // protect file from access by other users on the host |
|
|
|
|
575
|
40 |
|
return true; |
576
|
|
|
} |
577
|
|
|
|
578
|
|
|
/** |
579
|
|
|
* rename a file, prepending the protection line at the beginning |
580
|
|
|
* |
581
|
|
|
* @access public |
582
|
|
|
* @param string $srcFile |
583
|
|
|
* @param string $destFile |
584
|
|
|
* @return void |
585
|
|
|
*/ |
586
|
1 |
|
private function _prependRename($srcFile, $destFile) |
587
|
|
|
{ |
588
|
|
|
// don't overwrite already converted file |
589
|
1 |
|
if (!is_readable($destFile)) { |
590
|
1 |
|
$handle = fopen($srcFile, 'r', false, stream_context_create()); |
591
|
1 |
|
file_put_contents($destFile, self::PROTECTION_LINE . PHP_EOL); |
592
|
1 |
|
file_put_contents($destFile, $handle, FILE_APPEND); |
593
|
1 |
|
fclose($handle); |
594
|
|
|
} |
595
|
1 |
|
unlink($srcFile); |
596
|
1 |
|
} |
597
|
|
|
} |
598
|
|
|
|
If you suppress an error, we recommend checking for the error condition explicitly: