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https://github.com/phpbb/phpbb.git
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397 lines
10 KiB
PHP
397 lines
10 KiB
PHP
<?php
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/**
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*
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* @package phpBB3
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* @version $Id$
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* @copyright (c) 2005 phpBB Group
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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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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define('IN_PHPBB', true);
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$phpbb_root_path = './';
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$phpEx = substr(strrchr(__FILE__, '.'), 1);
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include($phpbb_root_path . 'common.' . $phpEx);
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$download_id = request_var('id', 0);
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$thumbnail = request_var('t', false);
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// Start session management, do not update session page.
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$user->session_begin(false);
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$auth->acl($user->data);
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$user->setup('viewtopic');
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if (!$download_id)
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{
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trigger_error('NO_ATTACHMENT_SELECTED');
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}
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if (!$config['allow_attachments'] && !$config['allow_pm_attach'])
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{
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trigger_error('ATTACHMENT_FUNCTIONALITY_DISABLED');
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}
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$sql = 'SELECT attach_id, in_message, post_msg_id, extension, is_orphan, poster_id
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FROM ' . ATTACHMENTS_TABLE . "
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WHERE attach_id = $download_id";
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$result = $db->sql_query_limit($sql, 1);
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$attachment = $db->sql_fetchrow($result);
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$db->sql_freeresult($result);
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if (!$attachment)
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{
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trigger_error('ERROR_NO_ATTACHMENT');
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}
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if ((!$attachment['in_message'] && !$config['allow_attachments']) || ($attachment['in_message'] && !$config['allow_pm_attach']))
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{
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trigger_error('ATTACHMENT_FUNCTIONALITY_DISABLED');
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}
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$row = array();
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if ($attachment['is_orphan'])
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{
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// We allow admins having attachment permissions to see orphan attachments...
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$own_attachment = ($auth->acl_get('a_attach') || $attachment['poster_id'] == $user->data['user_id']) ? true : false;
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if (!$own_attachment || ($attachment['in_message'] && !$auth->acl_get('u_pm_download')) || (!$attachment['in_message'] && !$auth->acl_get('u_download')))
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{
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trigger_error('ERROR_NO_ATTACHMENT');
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}
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// Obtain all extensions...
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$extensions = $cache->obtain_attach_extensions(true);
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}
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else
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{
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if (!$attachment['in_message'])
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{
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//
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$sql = 'SELECT p.forum_id, f.forum_password, f.parent_id
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FROM ' . POSTS_TABLE . ' p, ' . FORUMS_TABLE . ' f
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WHERE p.post_id = ' . $attachment['post_msg_id'] . '
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AND p.forum_id = f.forum_id';
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$result = $db->sql_query_limit($sql, 1);
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$row = $db->sql_fetchrow($result);
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$db->sql_freeresult($result);
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// Global announcement?
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if (!$row)
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{
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$forum_id = request_var('f', 0);
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$sql = 'SELECT forum_id, forum_password, parent_id
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FROM ' . FORUMS_TABLE . '
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WHERE forum_id = ' . $forum_id;
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$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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}
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if ($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($row);
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}
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}
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else
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{
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trigger_error('SORRY_AUTH_VIEW_ATTACH');
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}
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}
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else
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{
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$row['forum_id'] = false;
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if (!$auth->acl_get('u_pm_download'))
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{
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trigger_error('SORRY_AUTH_VIEW_ATTACH');
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}
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}
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// disallowed?
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$extensions = array();
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if (!extension_allowed($row['forum_id'], $attachment['extension'], $extensions))
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{
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trigger_error(sprintf($user->lang['EXTENSION_DISABLED_AFTER_POSTING'], $attachment['extension']));
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}
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}
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if (!download_allowed())
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{
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trigger_error($user->lang['LINKAGE_FORBIDDEN']);
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}
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$download_mode = (int) $extensions[$attachment['extension']]['download_mode'];
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// Fetching filename here to prevent sniffing of filename
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$sql = 'SELECT attach_id, is_orphan, in_message, post_msg_id, extension, physical_filename, real_filename, mimetype
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FROM ' . ATTACHMENTS_TABLE . "
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WHERE attach_id = $download_id";
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$result = $db->sql_query_limit($sql, 1);
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$attachment = $db->sql_fetchrow($result);
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$db->sql_freeresult($result);
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if (!$attachment)
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{
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trigger_error('ERROR_NO_ATTACHMENT');
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}
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$attachment['physical_filename'] = basename($attachment['physical_filename']);
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$display_cat = $extensions[$attachment['extension']]['display_cat'];
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if ($thumbnail)
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{
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$attachment['physical_filename'] = 'thumb_' . $attachment['physical_filename'];
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}
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else if (($display_cat == ATTACHMENT_CATEGORY_NONE || $display_cat == ATTACHMENT_CATEGORY_IMAGE) && !$attachment['is_orphan'])
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{
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// Update download count
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$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
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SET download_count = download_count + 1
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WHERE attach_id = ' . $attachment['attach_id'];
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$db->sql_query($sql);
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}
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// Determine the 'presenting'-method
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if ($download_mode == PHYSICAL_LINK)
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{
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// This presenting method should no longer be used
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if (!@is_dir($phpbb_root_path . $config['upload_path']))
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{
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trigger_error($user->lang['PHYSICAL_DOWNLOAD_NOT_POSSIBLE']);
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}
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redirect($phpbb_root_path . $config['upload_path'] . '/' . $attachment['physical_filename']);
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exit;
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}
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else
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{
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send_file_to_browser($attachment, $config['upload_path'], $extensions[$attachment['extension']]['display_cat']);
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exit;
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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, $config, $phpbb_root_path;
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$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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trigger_error($user->lang['ERROR_NO_ATTACHMENT'] . '<br /><br />' . sprintf($user->lang['FILE_NOT_FOUND_404'], $filename));
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}
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// Correct the mime type - we force application/octetstream for all files, except images
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// Please do not change this, it is a security precaution
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if (strpos($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($filename);
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// To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
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// Check if headers already sent or not able to get the file contents.
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if (headers_sent() || !@file_exists($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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trigger_error($user->lang['UNABLE_TO_DELIVER_FILE'] . '<br />' . sprintf($user->lang['TRACKED_PHP_ERROR'], $php_errormsg));
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}
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trigger_error('UNABLE_TO_DELIVER_FILE');
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}
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// Now the tricky part... let's dance
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header('Pragma: public');
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/**
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* Commented out X-Sendfile support. To not expose the physical filename within the header if xsendfile is absent we need to look into methods of checking it's status.
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*
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* Try X-Sendfile since it is much more server friendly - only works if the path is *not* outside of the root path...
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* lighttpd has core support for it. An apache2 module is available at http://celebnamer.celebworld.ws/stuff/mod_xsendfile/
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*
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* Not really ideal, but should work fine...
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* <code>
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* if (strpos($upload_dir, '/') !== 0 && strpos($upload_dir, '../') === false)
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* {
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* header('X-Sendfile: ' . $filename);
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* }
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* </code>
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*/
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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: ' . $attachment['mimetype']);
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header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
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if ($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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while (!feof($fp))
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{
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echo fread($fp, 8192);
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}
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fclose($fp);
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}
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flush();
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exit;
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}
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/**
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* Get a browser friendly UTF-8 encoded filename
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*/
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function header_filename($file)
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{
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$user_agent = $_SERVER['HTTP_USER_AGENT'];
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// There be dragons here.
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// Not many follows the RFC...
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if (strpos($user_agent, 'MSIE') !== false || strpos($user_agent, 'Safari') !== false || strpos($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, $db;
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if (!$config['secure_downloads'])
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{
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return true;
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}
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$url = (!empty($_SERVER['HTTP_REFERER'])) ? trim($_SERVER['HTTP_REFERER']) : trim(getenv('HTTP_REFERER'));
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if (!$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 = (!empty($_SERVER['SERVER_NAME'])) ? $_SERVER['SERVER_NAME'] : getenv('SERVER_NAME');
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// Forcing server vars is the only way to specify/override the protocol
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if ($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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