mirror of
https://github.com/phpbb/phpbb.git
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791 lines
20 KiB
PHP
791 lines
20 KiB
PHP
<?php
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/**
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*
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* This file is part of the phpBB Forum Software package.
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*
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* @copyright (c) phpBB Limited <https://www.phpbb.com>
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* @license GNU General Public License, version 2 (GPL-2.0)
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*
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* For full copyright and license information, please see
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* the docs/CREDITS.txt file.
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*
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*/
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/**
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* @ignore
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*/
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if (!defined('IN_PHPBB'))
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{
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exit;
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}
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/**
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* A simplified function to deliver avatars
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* The argument needs to be checked before calling this function.
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*/
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function send_avatar_to_browser($file, $browser)
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{
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global $config, $phpbb_root_path;
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$prefix = $config['avatar_salt'] . '_';
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$image_dir = $config['avatar_path'];
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// Adjust image_dir path (no trailing slash)
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if (substr($image_dir, -1, 1) == '/' || substr($image_dir, -1, 1) == '\\')
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{
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$image_dir = substr($image_dir, 0, -1) . '/';
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}
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$image_dir = str_replace(array('../', '..\\', './', '.\\'), '', $image_dir);
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if ($image_dir && ($image_dir[0] == '/' || $image_dir[0] == '\\'))
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{
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$image_dir = '';
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}
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$file_path = $phpbb_root_path . $image_dir . '/' . $prefix . $file;
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if ((@file_exists($file_path) && @is_readable($file_path)) && !headers_sent())
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{
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header('Cache-Control: public');
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$image_data = @getimagesize($file_path);
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header('Content-Type: ' . image_type_to_mime_type($image_data[2]));
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if ((strpos(strtolower($browser), 'msie') !== false) && !phpbb_is_greater_ie_version($browser, 7))
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{
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header('Content-Disposition: attachment; ' . header_filename($file));
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if (strpos(strtolower($browser), 'msie 6.0') !== false)
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{
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header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
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}
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else
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{
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT');
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}
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}
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else
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{
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header('Content-Disposition: inline; ' . header_filename($file));
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT');
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}
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$size = @filesize($file_path);
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if ($size)
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{
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header("Content-Length: $size");
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}
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if (@readfile($file_path) == false)
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{
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$fp = @fopen($file_path, 'rb');
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if ($fp !== false)
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{
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while (!feof($fp))
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{
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echo fread($fp, 8192);
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}
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fclose($fp);
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}
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}
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flush();
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}
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else
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{
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header('HTTP/1.0 404 Not Found');
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}
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}
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/**
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* Wraps an url into a simple html page. Used to display attachments in IE.
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* this is a workaround for now; might be moved to template system later
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* direct any complaints to 1 Microsoft Way, Redmond
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*/
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function wrap_img_in_html($src, $title)
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{
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echo '<!DOCTYPE html>';
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echo '<html>';
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echo '<head>';
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echo '<meta charset="utf-8">';
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echo '<meta http-equiv="X-UA-Compatible" content="IE=edge">';
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echo '<title>' . $title . '</title>';
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echo '</head>';
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echo '<body>';
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echo '<div>';
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echo '<img src="' . $src . '" alt="' . $title . '" />';
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echo '</div>';
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echo '</body>';
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echo '</html>';
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}
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/**
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* Send file to browser
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*/
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function send_file_to_browser($attachment, $upload_dir, $category)
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{
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global $user, $db, $phpbb_dispatcher, $phpbb_root_path, $request;
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$filename = $phpbb_root_path . $upload_dir . '/' . $attachment['physical_filename'];
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if (!@file_exists($filename))
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{
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send_status_line(404, 'Not Found');
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trigger_error('ERROR_NO_ATTACHMENT');
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}
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// Correct the mime type - we force application/octetstream for all files, except images
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// Please do not change this, it is a security precaution
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if ($category != ATTACHMENT_CATEGORY_IMAGE || strpos($attachment['mimetype'], 'image') !== 0)
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{
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$attachment['mimetype'] = (strpos(strtolower($user->browser), 'msie') !== false || strpos(strtolower($user->browser), 'opera') !== false) ? 'application/octetstream' : 'application/octet-stream';
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}
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if (@ob_get_length())
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{
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@ob_end_clean();
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}
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// Now send the File Contents to the Browser
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$size = @filesize($filename);
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/**
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* Event to alter attachment before it is sent to browser.
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*
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* @event core.send_file_to_browser_before
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* @var array attachment Attachment data
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* @var string upload_dir Relative path of upload directory
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* @var int category Attachment category
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* @var string filename Path to file, including filename
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* @var int size File size
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* @since 3.1.11-RC1
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*/
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$vars = array(
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'attachment',
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'upload_dir',
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'category',
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'filename',
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'size',
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);
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extract($phpbb_dispatcher->trigger_event('core.send_file_to_browser_before', compact($vars)));
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// To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
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// Check if headers already sent or not able to get the file contents.
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if (headers_sent() || !@file_exists($filename) || !@is_readable($filename))
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{
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// PHP track_errors setting On?
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if (!empty($php_errormsg))
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{
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send_status_line(500, 'Internal Server Error');
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trigger_error($user->lang['UNABLE_TO_DELIVER_FILE'] . '<br />' . sprintf($user->lang['TRACKED_PHP_ERROR'], $php_errormsg));
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}
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send_status_line(500, 'Internal Server Error');
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trigger_error('UNABLE_TO_DELIVER_FILE');
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}
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// Make sure the database record for the filesize is correct
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if ($size > 0 && $size != $attachment['filesize'] && strpos($attachment['physical_filename'], 'thumb_') === false)
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{
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// Update database record
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$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
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SET filesize = ' . (int) $size . '
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WHERE attach_id = ' . (int) $attachment['attach_id'];
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$db->sql_query($sql);
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}
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// Now the tricky part... let's dance
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header('Cache-Control: public');
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// Send out the Headers. Do not set Content-Disposition to inline please, it is a security measure for users using the Internet Explorer.
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header('Content-Type: ' . $attachment['mimetype']);
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if (phpbb_is_greater_ie_version($user->browser, 7))
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{
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header('X-Content-Type-Options: nosniff');
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}
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if ($category == ATTACHMENT_CATEGORY_FLASH && $request->variable('view', 0) === 1)
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{
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// We use content-disposition: inline for flash files and view=1 to let it correctly play with flash player 10 - any other disposition will fail to play inline
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header('Content-Disposition: inline');
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}
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else
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{
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if (empty($user->browser) || ((strpos(strtolower($user->browser), 'msie') !== false) && !phpbb_is_greater_ie_version($user->browser, 7)))
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{
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header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
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if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
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{
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header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
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}
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}
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else
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{
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header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
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if (phpbb_is_greater_ie_version($user->browser, 7) && (strpos($attachment['mimetype'], 'image') !== 0))
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{
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header('X-Download-Options: noopen');
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}
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}
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}
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// Close the db connection before sending the file etc.
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file_gc(false);
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if (!set_modified_headers($attachment['filetime'], $user->browser))
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{
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// We make sure those have to be enabled manually by defining a constant
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// because of the potential disclosure of full attachment path
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// in case support for features is absent in the webserver software.
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if (defined('PHPBB_ENABLE_X_ACCEL_REDIRECT') && PHPBB_ENABLE_X_ACCEL_REDIRECT)
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{
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// X-Accel-Redirect - http://wiki.nginx.org/XSendfile
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header('X-Accel-Redirect: ' . $user->page['root_script_path'] . $upload_dir . '/' . $attachment['physical_filename']);
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exit;
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}
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else if (defined('PHPBB_ENABLE_X_SENDFILE') && PHPBB_ENABLE_X_SENDFILE && !phpbb_http_byte_range($size))
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{
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// X-Sendfile - http://blog.lighttpd.net/articles/2006/07/02/x-sendfile
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// Lighttpd's X-Sendfile does not support range requests as of 1.4.26
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// and always requires an absolute path.
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header('X-Sendfile: ' . dirname(__FILE__) . "/../$upload_dir/{$attachment['physical_filename']}");
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exit;
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}
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if ($size)
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{
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header("Content-Length: $size");
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}
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// Try to deliver in chunks
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@set_time_limit(0);
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$fp = @fopen($filename, 'rb');
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if ($fp !== false)
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{
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// Deliver file partially if requested
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if ($range = phpbb_http_byte_range($size))
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{
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fseek($fp, $range['byte_pos_start']);
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send_status_line(206, 'Partial Content');
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header('Content-Range: bytes ' . $range['byte_pos_start'] . '-' . $range['byte_pos_end'] . '/' . $range['bytes_total']);
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header('Content-Length: ' . $range['bytes_requested']);
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// First read chunks
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while (!feof($fp) && ftell($fp) < $range['byte_pos_end'] - 8192)
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{
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echo fread($fp, 8192);
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}
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// Then, read the remainder
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echo fread($fp, $range['bytes_requested'] % 8192);
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}
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else
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{
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while (!feof($fp))
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{
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echo fread($fp, 8192);
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}
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}
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fclose($fp);
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}
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else
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{
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@readfile($filename);
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}
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flush();
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}
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exit;
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}
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/**
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* Get a browser friendly UTF-8 encoded filename
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*/
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function header_filename($file)
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{
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global $request;
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$user_agent = $request->header('User-Agent');
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// There be dragons here.
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// Not many follows the RFC...
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if (strpos($user_agent, 'MSIE') !== false || strpos($user_agent, 'Konqueror') !== false)
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{
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return "filename=" . rawurlencode($file);
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}
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// follow the RFC for extended filename for the rest
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return "filename*=UTF-8''" . rawurlencode($file);
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}
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/**
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* Check if downloading item is allowed
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*/
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function download_allowed()
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{
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global $config, $user, $db, $request;
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if (!$config['secure_downloads'])
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{
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return true;
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}
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$url = htmlspecialchars_decode($request->header('Referer'));
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if (!$url)
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{
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return ($config['secure_allow_empty_referer']) ? true : false;
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}
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// Split URL into domain and script part
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$url = @parse_url($url);
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if ($url === false)
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{
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return ($config['secure_allow_empty_referer']) ? true : false;
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}
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$hostname = $url['host'];
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unset($url);
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$allowed = ($config['secure_allow_deny']) ? false : true;
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$iplist = array();
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if (($ip_ary = @gethostbynamel($hostname)) !== false)
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{
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foreach ($ip_ary as $ip)
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{
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if ($ip)
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{
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$iplist[] = $ip;
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}
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}
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}
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// Check for own server...
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$server_name = $user->host;
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// Forcing server vars is the only way to specify/override the protocol
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if ($config['force_server_vars'] || !$server_name)
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{
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$server_name = $config['server_name'];
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}
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if (preg_match('#^.*?' . preg_quote($server_name, '#') . '.*?$#i', $hostname))
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{
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$allowed = true;
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}
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// Get IP's and Hostnames
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if (!$allowed)
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{
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$sql = 'SELECT site_ip, site_hostname, ip_exclude
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FROM ' . SITELIST_TABLE;
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$result = $db->sql_query($sql);
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while ($row = $db->sql_fetchrow($result))
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{
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$site_ip = trim($row['site_ip']);
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$site_hostname = trim($row['site_hostname']);
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if ($site_ip)
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{
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foreach ($iplist as $ip)
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{
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if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_ip, '#')) . '$#i', $ip))
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{
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if ($row['ip_exclude'])
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{
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$allowed = ($config['secure_allow_deny']) ? false : true;
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break 2;
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}
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else
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{
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$allowed = ($config['secure_allow_deny']) ? true : false;
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}
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}
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}
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}
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if ($site_hostname)
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{
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if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_hostname, '#')) . '$#i', $hostname))
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{
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if ($row['ip_exclude'])
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{
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$allowed = ($config['secure_allow_deny']) ? false : true;
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break;
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}
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else
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{
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$allowed = ($config['secure_allow_deny']) ? true : false;
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}
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}
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}
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}
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$db->sql_freeresult($result);
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}
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return $allowed;
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}
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/**
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* Check if the browser has the file already and set the appropriate headers-
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* @returns false if a resend is in order.
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*/
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function set_modified_headers($stamp, $browser)
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{
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global $request;
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// let's see if we have to send the file at all
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$last_load = $request->header('If-Modified-Since') ? strtotime(trim($request->header('If-Modified-Since'))) : false;
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if (strpos(strtolower($browser), 'msie 6.0') === false && !phpbb_is_greater_ie_version($browser, 7))
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{
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if ($last_load !== false && $last_load >= $stamp)
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{
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send_status_line(304, 'Not Modified');
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// seems that we need those too ... browsers
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header('Cache-Control: public');
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header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT');
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return true;
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}
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else
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{
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header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $stamp) . ' GMT');
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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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* Garbage Collection
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*
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* @param bool $exit Whether to die or not.
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*
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* @return null
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*/
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function file_gc($exit = true)
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{
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global $cache, $db;
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if (!empty($cache))
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{
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$cache->unload();
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}
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$db->sql_close();
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if ($exit)
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{
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exit;
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}
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}
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/**
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* HTTP range support (RFC 2616 Section 14.35)
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*
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* Allows browsers to request partial file content
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* in case a download has been interrupted.
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*
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* @param int $filesize the size of the file in bytes we are about to deliver
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*
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* @return mixed false if the whole file has to be delivered
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* associative array on success
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*/
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function phpbb_http_byte_range($filesize)
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{
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// Only call find_range_request() once.
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static $request_array;
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if (!$filesize)
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{
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return false;
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}
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if (!isset($request_array))
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{
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$request_array = phpbb_find_range_request();
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}
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return (empty($request_array)) ? false : phpbb_parse_range_request($request_array, $filesize);
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}
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/**
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* Searches for HTTP range request in request headers.
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*
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* @return mixed false if no request found
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* array of strings containing the requested ranges otherwise
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* e.g. array(0 => '0-0', 1 => '123-125')
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*/
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function phpbb_find_range_request()
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{
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global $request;
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$value = $request->header('Range');
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// Make sure range request starts with "bytes="
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if (strpos($value, 'bytes=') === 0)
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{
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// Strip leading 'bytes='
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// Multiple ranges can be separated by a comma
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return explode(',', substr($value, 6));
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}
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return false;
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}
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/**
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* Analyses a range request array.
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*
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* A range request can contain multiple ranges,
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* we however only handle the first request and
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* only support requests from a given byte to the end of the file.
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*
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* @param array $request_array array of strings containing the requested ranges
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* @param int $filesize the full size of the file in bytes that has been requested
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*
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* @return mixed false if the whole file has to be delivered
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* associative array on success
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* byte_pos_start the first byte position, can be passed to fseek()
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* byte_pos_end the last byte position
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* bytes_requested the number of bytes requested
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* bytes_total the full size of the file
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*/
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function phpbb_parse_range_request($request_array, $filesize)
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{
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$first_byte_pos = -1;
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$last_byte_pos = -1;
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// Go through all ranges
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foreach ($request_array as $range_string)
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{
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$range = explode('-', trim($range_string));
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// "-" is invalid, "0-0" however is valid and means the very first byte.
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if (count($range) != 2 || $range[0] === '' && $range[1] === '')
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{
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continue;
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}
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// Substitute defaults
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if ($range[0] === '')
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{
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$range[0] = 0;
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}
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if ($range[1] === '')
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{
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$range[1] = $filesize - 1;
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}
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if ($last_byte_pos >= 0 && $last_byte_pos + 1 != $range[0])
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{
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// We only support contiguous ranges, no multipart stuff :(
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return false;
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}
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if ($range[1] && $range[1] < $range[0])
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{
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// The requested range contains 0 bytes.
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continue;
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}
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// Return bytes from $range[0] to $range[1]
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if ($first_byte_pos < 0)
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{
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$first_byte_pos = (int) $range[0];
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}
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$last_byte_pos = (int) $range[1];
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if ($first_byte_pos >= $filesize)
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{
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// Requested range not satisfiable
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return false;
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}
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// Adjust last-byte-pos if it is absent or greater than the content.
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if ($range[1] === '' || $last_byte_pos >= $filesize)
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{
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$last_byte_pos = $filesize - 1;
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}
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}
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if ($first_byte_pos < 0 || $last_byte_pos < 0)
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{
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return false;
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}
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return array(
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'byte_pos_start' => $first_byte_pos,
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'byte_pos_end' => $last_byte_pos,
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'bytes_requested' => $last_byte_pos - $first_byte_pos + 1,
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'bytes_total' => $filesize,
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);
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}
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/**
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* Increments the download count of all provided attachments
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*
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* @param \phpbb\db\driver\driver_interface $db The database object
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* @param array|int $ids The attach_id of each attachment
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*
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* @return null
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*/
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function phpbb_increment_downloads($db, $ids)
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{
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if (!is_array($ids))
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{
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$ids = array($ids);
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}
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$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
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SET download_count = download_count + 1
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WHERE ' . $db->sql_in_set('attach_id', $ids);
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$db->sql_query($sql);
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}
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/**
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* Handles authentication when downloading attachments from a post or topic
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*
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* @param \phpbb\db\driver\driver_interface $db The database object
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* @param \phpbb\auth\auth $auth The authentication object
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* @param int $topic_id The id of the topic that we are downloading from
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*
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* @return null
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*/
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function phpbb_download_handle_forum_auth($db, $auth, $topic_id)
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{
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global $phpbb_container;
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$sql_array = array(
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'SELECT' => 't.topic_visibility, t.forum_id, f.forum_name, f.forum_password, f.parent_id',
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'FROM' => array(
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TOPICS_TABLE => 't',
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FORUMS_TABLE => 'f',
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),
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'WHERE' => 't.topic_id = ' . (int) $topic_id . '
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AND t.forum_id = f.forum_id',
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);
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$sql = $db->sql_build_query('SELECT', $sql_array);
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$result = $db->sql_query($sql);
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$row = $db->sql_fetchrow($result);
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$db->sql_freeresult($result);
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$phpbb_content_visibility = $phpbb_container->get('content.visibility');
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if ($row && !$phpbb_content_visibility->is_visible('topic', $row['forum_id'], $row))
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{
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send_status_line(404, 'Not Found');
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trigger_error('ERROR_NO_ATTACHMENT');
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}
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else if ($row && $auth->acl_get('u_download') && $auth->acl_get('f_download', $row['forum_id']))
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{
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if ($row['forum_password'])
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{
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// Do something else ... ?
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login_forum_box($row);
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}
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}
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else
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{
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send_status_line(403, 'Forbidden');
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trigger_error('SORRY_AUTH_VIEW_ATTACH');
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}
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}
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/**
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* Handles authentication when downloading attachments from PMs
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*
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* @param \phpbb\db\driver\driver_interface $db The database object
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* @param \phpbb\auth\auth $auth The authentication object
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* @param int $user_id The user id
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* @param int $msg_id The id of the PM that we are downloading from
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*
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* @return null
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*/
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function phpbb_download_handle_pm_auth($db, $auth, $user_id, $msg_id)
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{
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global $phpbb_dispatcher;
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if (!$auth->acl_get('u_pm_download'))
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{
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send_status_line(403, 'Forbidden');
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trigger_error('SORRY_AUTH_VIEW_ATTACH');
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}
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$allowed = phpbb_download_check_pm_auth($db, $user_id, $msg_id);
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/**
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* Event to modify PM attachments download auth
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*
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* @event core.modify_pm_attach_download_auth
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* @var bool allowed Whether the user is allowed to download from that PM or not
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* @var int msg_id The id of the PM to download from
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* @var int user_id The user id for auth check
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* @since 3.1.11-RC1
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*/
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$vars = array('allowed', 'msg_id', 'user_id');
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extract($phpbb_dispatcher->trigger_event('core.modify_pm_attach_download_auth', compact($vars)));
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if (!$allowed)
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{
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send_status_line(403, 'Forbidden');
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trigger_error('ERROR_NO_ATTACHMENT');
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}
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}
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/**
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* Checks whether a user can download from a particular PM
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*
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* @param \phpbb\db\driver\driver_interface $db The database object
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* @param int $user_id The user id
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* @param int $msg_id The id of the PM that we are downloading from
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*
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* @return bool Whether the user is allowed to download from that PM or not
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*/
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function phpbb_download_check_pm_auth($db, $user_id, $msg_id)
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{
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// Check if the attachment is within the users scope...
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$sql = 'SELECT msg_id
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FROM ' . PRIVMSGS_TO_TABLE . '
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WHERE msg_id = ' . (int) $msg_id . '
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AND (
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user_id = ' . (int) $user_id . '
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OR author_id = ' . (int) $user_id . '
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)';
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$result = $db->sql_query_limit($sql, 1);
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$allowed = (bool) $db->sql_fetchfield('msg_id');
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$db->sql_freeresult($result);
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return $allowed;
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}
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/**
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* Check if the browser is internet explorer version 7+
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*
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* @param string $user_agent User agent HTTP header
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* @param int $version IE version to check against
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*
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* @return bool true if internet explorer version is greater than $version
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*/
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function phpbb_is_greater_ie_version($user_agent, $version)
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{
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if (preg_match('/msie (\d+)/', strtolower($user_agent), $matches))
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{
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$ie_version = (int) $matches[1];
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return ($ie_version > $version);
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}
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else
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{
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return false;
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}
|
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}
|