/forum/download/file.php
PHP | 737 lines | 547 code | 98 blank | 92 comment | 143 complexity | e01f42760aeb5e313a2783303650f34d MD5 | raw file
Possible License(s): AGPL-1.0, LGPL-3.0, MPL-2.0-no-copyleft-exception
- <?php
- /**
- *
- * @package phpBB3
- * @version $Id$
- * @copyright (c) 2005 phpBB Group
- * @license http://opensource.org/licenses/gpl-license.php GNU Public License
- *
- */
- /**
- * @ignore
- */
- define('IN_PHPBB', true);
- $phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './../';
- $phpEx = substr(strrchr(__FILE__, '.'), 1);
- // Thank you sun.
- if (isset($_SERVER['CONTENT_TYPE']))
- {
- if ($_SERVER['CONTENT_TYPE'] === 'application/x-java-archive')
- {
- exit;
- }
- }
- else if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], 'Java') !== false)
- {
- exit;
- }
- if (isset($_GET['avatar']))
- {
- require($phpbb_root_path . 'includes/startup.' . $phpEx);
- require($phpbb_root_path . 'config.' . $phpEx);
- if (!defined('PHPBB_INSTALLED') || empty($dbms) || empty($acm_type))
- {
- exit;
- }
- require($phpbb_root_path . 'includes/acm/acm_' . $acm_type . '.' . $phpEx);
- require($phpbb_root_path . 'includes/cache.' . $phpEx);
- require($phpbb_root_path . 'includes/db/' . $dbms . '.' . $phpEx);
- require($phpbb_root_path . 'includes/constants.' . $phpEx);
- require($phpbb_root_path . 'includes/automatic_dst.' . $phpEx);
- require($phpbb_root_path . 'includes/functions.' . $phpEx);
- $db = new $sql_db();
- $cache = new cache();
- // Connect to DB
- if (!@$db->sql_connect($dbhost, $dbuser, $dbpasswd, $dbname, $dbport, false, false))
- {
- exit;
- }
- unset($dbpasswd);
- // worst-case default
- $browser = (!empty($_SERVER['HTTP_USER_AGENT'])) ? htmlspecialchars((string) $_SERVER['HTTP_USER_AGENT']) : 'msie 6.0';
- $config = $cache->obtain_config();
- $filename = request_var('avatar', '');
- $avatar_group = false;
- $exit = false;
- if (isset($filename[0]) && $filename[0] === 'g')
- {
- $avatar_group = true;
- $filename = substr($filename, 1);
- }
- // '==' is not a bug - . as the first char is as bad as no dot at all
- if (strpos($filename, '.') == false)
- {
- send_status_line(403, 'Forbidden');
- $exit = true;
- }
- if (!$exit)
- {
- $ext = substr(strrchr($filename, '.'), 1);
- $stamp = (int) substr(stristr($filename, '_'), 1);
- $filename = (int) $filename;
- $exit = set_modified_headers($stamp, $browser);
- }
- if (!$exit && !in_array($ext, array('png', 'gif', 'jpg', 'jpeg')))
- {
- // no way such an avatar could exist. They are not following the rules, stop the show.
- send_status_line(403, 'Forbidden');
- $exit = true;
- }
- if (!$exit)
- {
- if (!$filename)
- {
- // no way such an avatar could exist. They are not following the rules, stop the show.
- send_status_line(403, 'Forbidden');
- }
- else
- {
- send_avatar_to_browser(($avatar_group ? 'g' : '') . $filename . '.' . $ext, $browser);
- }
- }
- file_gc();
- }
- // implicit else: we are not in avatar mode
- include($phpbb_root_path . 'common.' . $phpEx);
- $download_id = request_var('id', 0);
- $mode = request_var('mode', '');
- $thumbnail = request_var('t', false);
- // Start session management, do not update session page.
- $user->session_begin(false);
- $auth->acl($user->data);
- $user->setup('viewtopic');
- if (!$download_id)
- {
- send_status_line(404, 'Not Found');
- trigger_error('NO_ATTACHMENT_SELECTED');
- }
- if (!$config['allow_attachments'] && !$config['allow_pm_attach'])
- {
- send_status_line(404, 'Not Found');
- trigger_error('ATTACHMENT_FUNCTIONALITY_DISABLED');
- }
- $sql = 'SELECT attach_id, in_message, post_msg_id, extension, is_orphan, poster_id, filetime
- FROM ' . ATTACHMENTS_TABLE . "
- WHERE attach_id = $download_id";
- $result = $db->sql_query_limit($sql, 1);
- $attachment = $db->sql_fetchrow($result);
- $db->sql_freeresult($result);
- if (!$attachment)
- {
- send_status_line(404, 'Not Found');
- trigger_error('ERROR_NO_ATTACHMENT');
- }
- if ((!$attachment['in_message'] && !$config['allow_attachments']) || ($attachment['in_message'] && !$config['allow_pm_attach']))
- {
- send_status_line(404, 'Not Found');
- trigger_error('ATTACHMENT_FUNCTIONALITY_DISABLED');
- }
- $row = array();
- if ($attachment['is_orphan'])
- {
- // We allow admins having attachment permissions to see orphan attachments...
- $own_attachment = ($auth->acl_get('a_attach') || $attachment['poster_id'] == $user->data['user_id']) ? true : false;
- if (!$own_attachment || ($attachment['in_message'] && !$auth->acl_get('u_pm_download')) || (!$attachment['in_message'] && !$auth->acl_get('u_download')))
- {
- send_status_line(404, 'Not Found');
- trigger_error('ERROR_NO_ATTACHMENT');
- }
- // Obtain all extensions...
- $extensions = $cache->obtain_attach_extensions(true);
- }
- else
- {
- if (!$attachment['in_message'])
- {
- //
- $sql = 'SELECT p.forum_id, f.forum_password, f.parent_id
- FROM ' . POSTS_TABLE . ' p, ' . FORUMS_TABLE . ' f
- WHERE p.post_id = ' . $attachment['post_msg_id'] . '
- AND p.forum_id = f.forum_id';
- $result = $db->sql_query_limit($sql, 1);
- $row = $db->sql_fetchrow($result);
- $db->sql_freeresult($result);
- // Global announcement?
- $f_download = (!$row) ? $auth->acl_getf_global('f_download') : $auth->acl_get('f_download', $row['forum_id']);
- if ($auth->acl_get('u_download') && $f_download)
- {
- if ($row && $row['forum_password'])
- {
- // Do something else ... ?
- login_forum_box($row);
- }
- }
- else
- {
- send_status_line(403, 'Forbidden');
- trigger_error('SORRY_AUTH_VIEW_ATTACH');
- }
- }
- else
- {
- $row['forum_id'] = false;
- if (!$auth->acl_get('u_pm_download'))
- {
- send_status_line(403, 'Forbidden');
- trigger_error('SORRY_AUTH_VIEW_ATTACH');
- }
- // Check if the attachment is within the users scope...
- $sql = 'SELECT user_id, author_id
- FROM ' . PRIVMSGS_TO_TABLE . '
- WHERE msg_id = ' . $attachment['post_msg_id'];
- $result = $db->sql_query($sql);
- $allowed = false;
- while ($user_row = $db->sql_fetchrow($result))
- {
- if ($user->data['user_id'] == $user_row['user_id'] || $user->data['user_id'] == $user_row['author_id'])
- {
- $allowed = true;
- break;
- }
- }
- $db->sql_freeresult($result);
- if (!$allowed)
- {
- send_status_line(403, 'Forbidden');
- trigger_error('ERROR_NO_ATTACHMENT');
- }
- }
- // disallowed?
- $extensions = array();
- if (!extension_allowed($row['forum_id'], $attachment['extension'], $extensions))
- {
- send_status_line(404, 'Forbidden');
- trigger_error(sprintf($user->lang['EXTENSION_DISABLED_AFTER_POSTING'], $attachment['extension']));
- }
- }
- if (!download_allowed())
- {
- send_status_line(403, 'Forbidden');
- trigger_error($user->lang['LINKAGE_FORBIDDEN']);
- }
- $download_mode = (int) $extensions[$attachment['extension']]['download_mode'];
- // www.phpBB-SEO.com SEO TOOLKIT BEGIN -> Zero dupe
- // Added , attach_comment
- // Fetching filename here to prevent sniffing of filename
- $sql = 'SELECT attach_id, is_orphan, in_message, post_msg_id, extension, physical_filename, real_filename, mimetype, filetime, attach_comment
- FROM ' . ATTACHMENTS_TABLE . "
- WHERE attach_id = $download_id";
- // www.phpBB-SEO.com SEO TOOLKIT END -> Zero dupe
- $result = $db->sql_query_limit($sql, 1);
- $attachment = $db->sql_fetchrow($result);
- $db->sql_freeresult($result);
- if (!$attachment)
- {
- send_status_line(404, 'Not Found');
- trigger_error('ERROR_NO_ATTACHMENT');
- }
- $attachment['physical_filename'] = utf8_basename($attachment['physical_filename']);
- $display_cat = $extensions[$attachment['extension']]['display_cat'];
- if (($display_cat == ATTACHMENT_CATEGORY_IMAGE || $display_cat == ATTACHMENT_CATEGORY_THUMB) && !$user->optionget('viewimg'))
- {
- $display_cat = ATTACHMENT_CATEGORY_NONE;
- }
- if ($display_cat == ATTACHMENT_CATEGORY_FLASH && !$user->optionget('viewflash'))
- {
- $display_cat = ATTACHMENT_CATEGORY_NONE;
- }
- // www.phpBB-SEO.com SEO TOOLKIT BEGIN -> Zero dupe
- if (!empty($phpbb_seo->seo_opt['rewrite_files'])) {
- if (empty($phpbb_seo->seo_url['file'][$download_id])) {
- $comment = bbcode_nl2br(censor_text($attachment['attach_comment']));
- $comment_clean = preg_replace('`<[^>]*>`Ui', ' ', $comment);
- $_display_cat = ($thumbnail && $display_cat != ATTACHMENT_CATEGORY_NONE) ? ATTACHMENT_CATEGORY_THUMB : $display_cat;
- if (($_pos = utf8_strpos($comment, '<br')) !== false) {
- $comment_url = strip_tags(utf8_substr($comment, 0, $_pos));
- } else {
- $comment_url = $comment_clean;
- }
- $comment_url = utf8_strlen($comment_url) > 60 ? utf8_substr($comment_url, 0, 60) : $comment_url;
- $phpbb_seo->seo_url['file'][$download_id] = $phpbb_seo->format_url($comment_url, $phpbb_seo->seo_static['file'][$display_cat]);
- }
- $phpbb_seo->seo_opt['zero_dupe']['redir_def'] = array(
- 'id' => array('val' => $download_id, 'keep' => true),
- 'mode' => array('val' => $mode, 'keep' => (boolean) ($mode == 'view')),
- 't' => array('val' => $thumbnail, 'keep' => $thumbnail),
- );
- $phpbb_seo->seo_chk_dupe('', '', $phpbb_root_path . 'download/');
- }
- // www.phpBB-SEO.com SEO TOOLKIT END -> Zero dupe
- if ($thumbnail)
- {
- $attachment['physical_filename'] = 'thumb_' . $attachment['physical_filename'];
- }
- else if (($display_cat == ATTACHMENT_CATEGORY_NONE/* || $display_cat == ATTACHMENT_CATEGORY_IMAGE*/) && !$attachment['is_orphan'])
- {
- // Update download count
- $sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
- SET download_count = download_count + 1
- WHERE attach_id = ' . $attachment['attach_id'];
- $db->sql_query($sql);
- }
- if ($display_cat == ATTACHMENT_CATEGORY_IMAGE && $mode === 'view' && (strpos($attachment['mimetype'], 'image') === 0) && ((strpos(strtolower($user->browser), 'msie') !== false) && (strpos(strtolower($user->browser), 'msie 8.0') === false)))
- {
- wrap_img_in_html(append_sid($phpbb_root_path . 'download/file.' . $phpEx, 'id=' . $attachment['attach_id']), $attachment['real_filename']);
- file_gc();
- }
- else
- {
- // Determine the 'presenting'-method
- if ($download_mode == PHYSICAL_LINK)
- {
- // This presenting method should no longer be used
- if (!@is_dir($phpbb_root_path . $config['upload_path']))
- {
- send_status_line(500, 'Internal Server Error');
- trigger_error($user->lang['PHYSICAL_DOWNLOAD_NOT_POSSIBLE']);
- }
- redirect($phpbb_root_path . $config['upload_path'] . '/' . $attachment['physical_filename']);
- file_gc();
- }
- else
- {
- send_file_to_browser($attachment, $config['upload_path'], $display_cat);
- file_gc();
- }
- }
- /**
- * A simplified function to deliver avatars
- * The argument needs to be checked before calling this function.
- */
- function send_avatar_to_browser($file, $browser)
- {
- global $config, $phpbb_root_path;
- $prefix = $config['avatar_salt'] . '_';
- $image_dir = $config['avatar_path'];
- // Adjust image_dir path (no trailing slash)
- if (substr($image_dir, -1, 1) == '/' || substr($image_dir, -1, 1) == '\\')
- {
- $image_dir = substr($image_dir, 0, -1) . '/';
- }
- $image_dir = str_replace(array('../', '..\\', './', '.\\'), '', $image_dir);
- if ($image_dir && ($image_dir[0] == '/' || $image_dir[0] == '\\'))
- {
- $image_dir = '';
- }
- $file_path = $phpbb_root_path . $image_dir . '/' . $prefix . $file;
- if ((@file_exists($file_path) && @is_readable($file_path)) && !headers_sent())
- {
- header('Pragma: public');
- $image_data = @getimagesize($file_path);
- header('Content-Type: ' . image_type_to_mime_type($image_data[2]));
- if (strpos(strtolower($browser), 'msie') !== false && strpos(strtolower($browser), 'msie 8.0') === false)
- {
- header('Content-Disposition: attachment; ' . header_filename($file));
- if (strpos(strtolower($browser), 'msie 6.0') !== false)
- {
- header('Expires: -1');
- }
- else
- {
- header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
- }
- }
- else
- {
- header('Content-Disposition: inline; ' . header_filename($file));
- header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
- }
- $size = @filesize($file_path);
- if ($size)
- {
- header("Content-Length: $size");
- }
- if (@readfile($file_path) == false)
- {
- $fp = @fopen($file_path, 'rb');
- if ($fp !== false)
- {
- while (!feof($fp))
- {
- echo fread($fp, 8192);
- }
- fclose($fp);
- }
- }
- flush();
- }
- else
- {
- send_status_line(404, 'Not Found');
- }
- }
- /**
- * Wraps an url into a simple html page. Used to display attachments in IE.
- * this is a workaround for now; might be moved to template system later
- * direct any complaints to 1 Microsoft Way, Redmond
- */
- function wrap_img_in_html($src, $title)
- {
- echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-Strict.dtd">';
- echo '<html>';
- echo '<head>';
- echo '<meta http-equiv="content-type" content="text/html; charset=UTF-8" />';
- echo '<title>' . $title . '</title>';
- echo '</head>';
- echo '<body>';
- echo '<div>';
- echo '<img src="' . $src . '" alt="' . $title . '" />';
- echo '</div>';
- echo '</body>';
- echo '</html>';
- }
- /**
- * Send file to browser
- */
- function send_file_to_browser($attachment, $upload_dir, $category)
- {
- global $user, $db, $config, $phpbb_root_path;
- $filename = $phpbb_root_path . $upload_dir . '/' . $attachment['physical_filename'];
- if (!@file_exists($filename))
- {
- send_status_line(404, 'Not Found');
- trigger_error($user->lang['ERROR_NO_ATTACHMENT'] . '<br /><br />' . sprintf($user->lang['FILE_NOT_FOUND_404'], $filename));
- }
- // Correct the mime type - we force application/octetstream for all files, except images
- // Please do not change this, it is a security precaution
- if ($category != ATTACHMENT_CATEGORY_IMAGE || strpos($attachment['mimetype'], 'image') !== 0)
- {
- $attachment['mimetype'] = (strpos(strtolower($user->browser), 'msie') !== false || strpos(strtolower($user->browser), 'opera') !== false) ? 'application/octetstream' : 'application/octet-stream';
- }
- if (@ob_get_length())
- {
- @ob_end_clean();
- }
- // Now send the File Contents to the Browser
- $size = @filesize($filename);
- // To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
- // Check if headers already sent or not able to get the file contents.
- if (headers_sent() || !@file_exists($filename) || !@is_readable($filename))
- {
- // PHP track_errors setting On?
- if (!empty($php_errormsg))
- {
- send_status_line(500, 'Internal Server Error');
- trigger_error($user->lang['UNABLE_TO_DELIVER_FILE'] . '<br />' . sprintf($user->lang['TRACKED_PHP_ERROR'], $php_errormsg));
- }
- send_status_line(500, 'Internal Server Error');
- trigger_error('UNABLE_TO_DELIVER_FILE');
- }
- // Now the tricky part... let's dance
- header('Pragma: public');
- /**
- * Commented out X-Sendfile support. To not expose the physical filename within the header if xsendfile is absent we need to look into methods of checking it's status.
- *
- * Try X-Sendfile since it is much more server friendly - only works if the path is *not* outside of the root path...
- * lighttpd has core support for it. An apache2 module is available at http://celebnamer.celebworld.ws/stuff/mod_xsendfile/
- *
- * Not really ideal, but should work fine...
- * <code>
- * if (strpos($upload_dir, '/') !== 0 && strpos($upload_dir, '../') === false)
- * {
- * header('X-Sendfile: ' . $filename);
- * }
- * </code>
- */
- // Send out the Headers. Do not set Content-Disposition to inline please, it is a security measure for users using the Internet Explorer.
- $is_ie8 = (strpos(strtolower($user->browser), 'msie 8.0') !== false);
- header('Content-Type: ' . $attachment['mimetype']);
- if ($is_ie8)
- {
- header('X-Content-Type-Options: nosniff');
- }
- if ($category == ATTACHMENT_CATEGORY_FLASH && request_var('view', 0) === 1)
- {
- // We use content-disposition: inline for flash files and view=1 to let it correctly play with flash player 10 - any other disposition will fail to play inline
- header('Content-Disposition: inline');
- }
- else
- {
- if (empty($user->browser) || (!$is_ie8 && (strpos(strtolower($user->browser), 'msie') !== false)))
- {
- header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
- if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
- {
- header('expires: -1');
- }
- }
- else
- {
- header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
- if ($is_ie8 && (strpos($attachment['mimetype'], 'image') !== 0))
- {
- header('X-Download-Options: noopen');
- }
- }
- }
- if ($size)
- {
- header("Content-Length: $size");
- }
- // Close the db connection before sending the file
- $db->sql_close();
- if (!set_modified_headers($attachment['filetime'], $user->browser))
- {
- // Try to deliver in chunks
- @set_time_limit(0);
- $fp = @fopen($filename, 'rb');
- if ($fp !== false)
- {
- while (!feof($fp))
- {
- echo fread($fp, 8192);
- }
- fclose($fp);
- }
- else
- {
- @readfile($filename);
- }
- flush();
- }
- file_gc();
- }
- /**
- * Get a browser friendly UTF-8 encoded filename
- */
- function header_filename($file)
- {
- $user_agent = (!empty($_SERVER['HTTP_USER_AGENT'])) ? htmlspecialchars((string) $_SERVER['HTTP_USER_AGENT']) : '';
- // There be dragons here.
- // Not many follows the RFC...
- if (strpos($user_agent, 'MSIE') !== false || strpos($user_agent, 'Safari') !== false || strpos($user_agent, 'Konqueror') !== false)
- {
- return "filename=" . rawurlencode($file);
- }
- // follow the RFC for extended filename for the rest
- return "filename*=UTF-8''" . rawurlencode($file);
- }
- /**
- * Check if downloading item is allowed
- */
- function download_allowed()
- {
- global $config, $user, $db;
- if (!$config['secure_downloads'])
- {
- return true;
- }
- $url = (!empty($_SERVER['HTTP_REFERER'])) ? trim($_SERVER['HTTP_REFERER']) : trim(getenv('HTTP_REFERER'));
- if (!$url)
- {
- return ($config['secure_allow_empty_referer']) ? true : false;
- }
- // Split URL into domain and script part
- $url = @parse_url($url);
- if ($url === false)
- {
- return ($config['secure_allow_empty_referer']) ? true : false;
- }
- $hostname = $url['host'];
- unset($url);
- $allowed = ($config['secure_allow_deny']) ? false : true;
- $iplist = array();
- if (($ip_ary = @gethostbynamel($hostname)) !== false)
- {
- foreach ($ip_ary as $ip)
- {
- if ($ip)
- {
- $iplist[] = $ip;
- }
- }
- }
- // Check for own server...
- $server_name = $user->host;
- // Forcing server vars is the only way to specify/override the protocol
- if ($config['force_server_vars'] || !$server_name)
- {
- $server_name = $config['server_name'];
- }
- if (preg_match('#^.*?' . preg_quote($server_name, '#') . '.*?$#i', $hostname))
- {
- $allowed = true;
- }
- // Get IP's and Hostnames
- if (!$allowed)
- {
- $sql = 'SELECT site_ip, site_hostname, ip_exclude
- FROM ' . SITELIST_TABLE;
- $result = $db->sql_query($sql);
- while ($row = $db->sql_fetchrow($result))
- {
- $site_ip = trim($row['site_ip']);
- $site_hostname = trim($row['site_hostname']);
- if ($site_ip)
- {
- foreach ($iplist as $ip)
- {
- if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_ip, '#')) . '$#i', $ip))
- {
- if ($row['ip_exclude'])
- {
- $allowed = ($config['secure_allow_deny']) ? false : true;
- break 2;
- }
- else
- {
- $allowed = ($config['secure_allow_deny']) ? true : false;
- }
- }
- }
- }
- if ($site_hostname)
- {
- if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_hostname, '#')) . '$#i', $hostname))
- {
- if ($row['ip_exclude'])
- {
- $allowed = ($config['secure_allow_deny']) ? false : true;
- break;
- }
- else
- {
- $allowed = ($config['secure_allow_deny']) ? true : false;
- }
- }
- }
- }
- $db->sql_freeresult($result);
- }
- return $allowed;
- }
- /**
- * Check if the browser has the file already and set the appropriate headers-
- * @returns false if a resend is in order.
- */
- function set_modified_headers($stamp, $browser)
- {
- // let's see if we have to send the file at all
- $last_load = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? strtotime(trim($_SERVER['HTTP_IF_MODIFIED_SINCE'])) : false;
- if ((strpos(strtolower($browser), 'msie 6.0') === false) && (strpos(strtolower($browser), 'msie 8.0') === false))
- {
- if ($last_load !== false && $last_load >= $stamp)
- {
- send_status_line(304, 'Not Modified');
- // seems that we need those too ... browsers
- header('Pragma: public');
- header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
- return true;
- }
- else
- {
- header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $stamp) . ' GMT');
- }
- }
- return false;
- }
- function file_gc()
- {
- global $cache, $db;
- if (!empty($cache))
- {
- $cache->unload();
- }
- $db->sql_close();
- exit;
- }
- ?>