0x1949 Team - FAZEMRX - MANAGER
Edit File: functions_download.php
<?php /** * * This file is part of the phpBB Forum Software package. * * @copyright (c) phpBB Limited <https://www.phpbb.com> * @license GNU General Public License, version 2 (GPL-2.0) * * For full copyright and license information, please see * the docs/CREDITS.txt file. * */ /** * @ignore */ if (!defined('IN_PHPBB')) { exit; } /** * 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('Cache-Control: public'); $image_data = @getimagesize($file_path); header('Content-Type: ' . image_type_to_mime_type($image_data[2])); if ((strpos(strtolower($browser), 'msie') !== false) && !phpbb_is_greater_ie_version($browser, 7)) { header('Content-Disposition: attachment; ' . header_filename($file)); if (strpos(strtolower($browser), 'msie 6.0') !== false) { header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT'); } else { header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT'); } } else { header('Content-Disposition: inline; ' . header_filename($file)); header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT'); } $size = @filesize($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 { header('HTTP/1.0 404 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>'; echo '<html>'; echo '<head>'; echo '<meta charset="utf-8">'; echo '<meta http-equiv="X-UA-Compatible" content="IE=edge">'; 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, $phpbb_dispatcher, $phpbb_root_path, $request; $filename = $phpbb_root_path . $upload_dir . '/' . $attachment['physical_filename']; if (!@file_exists($filename)) { send_status_line(404, 'Not Found'); trigger_error('ERROR_NO_ATTACHMENT'); } // 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); /** * Event to alter attachment before it is sent to browser. * * @event core.send_file_to_browser_before * @var array attachment Attachment data * @var string upload_dir Relative path of upload directory * @var int category Attachment category * @var string filename Path to file, including filename * @var int size File size * @since 3.1.11-RC1 */ $vars = array( 'attachment', 'upload_dir', 'category', 'filename', 'size', ); extract($phpbb_dispatcher->trigger_event('core.send_file_to_browser_before', compact($vars))); // To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work) // Check if headers already sent or not able to get the file contents. if (headers_sent() || !@file_exists($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'], $php_errormsg)); } send_status_line(500, 'Internal Server Error'); trigger_error('UNABLE_TO_DELIVER_FILE'); } // Make sure the database record for the filesize is correct if ($size > 0 && $size != $attachment['filesize'] && strpos($attachment['physical_filename'], 'thumb_') === false) { // Update database record $sql = 'UPDATE ' . ATTACHMENTS_TABLE . ' SET filesize = ' . (int) $size . ' WHERE attach_id = ' . (int) $attachment['attach_id']; $db->sql_query($sql); } // Now the tricky part... let's dance header('Cache-Control: private'); // Send out the Headers. Do not set Content-Disposition to inline please, it is a security measure for users using the Internet Explorer. header('Content-Type: ' . $attachment['mimetype']); if (phpbb_is_greater_ie_version($user->browser, 7)) { header('X-Content-Type-Options: nosniff'); } if (empty($user->browser) || ((strpos(strtolower($user->browser), 'msie') !== false) && !phpbb_is_greater_ie_version($user->browser, 7))) { header('Content-Disposition: attachment; ' . header_filename(html_entity_decode($attachment['real_filename'], ENT_COMPAT))); if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false)) { header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT'); } } else { header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(html_entity_decode($attachment['real_filename'], ENT_COMPAT))); if (phpbb_is_greater_ie_version($user->browser, 7) && (strpos($attachment['mimetype'], 'image') !== 0)) { header('X-Download-Options: noopen'); } } // Close the db connection before sending the file etc. file_gc(false); if (!set_modified_headers($attachment['filetime'], $user->browser)) { // We make sure those have to be enabled manually by defining a constant // because of the potential disclosure of full attachment path // in case support for features is absent in the webserver software. if (defined('PHPBB_ENABLE_X_ACCEL_REDIRECT') && PHPBB_ENABLE_X_ACCEL_REDIRECT) { // X-Accel-Redirect - http://wiki.nginx.org/XSendfile header('X-Accel-Redirect: ' . $user->page['root_script_path'] . $upload_dir . '/' . $attachment['physical_filename']); exit; } else if (defined('PHPBB_ENABLE_X_SENDFILE') && PHPBB_ENABLE_X_SENDFILE && !phpbb_http_byte_range($size)) { // X-Sendfile - http://blog.lighttpd.net/articles/2006/07/02/x-sendfile // Lighttpd's X-Sendfile does not support range requests as of 1.4.26 // and always requires an absolute path. header('X-Sendfile: ' . __DIR__ . "/../$upload_dir/{$attachment['physical_filename']}"); exit; } if ($size) { header("Content-Length: $size"); } // Try to deliver in chunks @set_time_limit(0); $fp = @fopen($filename, 'rb'); if ($fp !== false) { // Deliver file partially if requested if ($range = phpbb_http_byte_range($size)) { fseek($fp, $range['byte_pos_start']); send_status_line(206, 'Partial Content'); header('Content-Range: bytes ' . $range['byte_pos_start'] . '-' . $range['byte_pos_end'] . '/' . $range['bytes_total']); header('Content-Length: ' . $range['bytes_requested']); // First read chunks while (!feof($fp) && ftell($fp) < $range['byte_pos_end'] - 8192) { echo fread($fp, 8192); } // Then, read the remainder echo fread($fp, $range['bytes_requested'] % 8192); } else { while (!feof($fp)) { echo fread($fp, 8192); } } fclose($fp); } else { @readfile($filename); } flush(); } exit; } /** * Get a browser friendly UTF-8 encoded filename */ function header_filename($file) { global $request; $user_agent = $request->header('User-Agent'); // There be dragons here. // Not many follows the RFC... if (strpos($user_agent, 'MSIE') !== 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, $request; if (!$config['secure_downloads']) { return true; } $url = html_entity_decode($request->header('Referer'), ENT_COMPAT); 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) { global $request; // let's see if we have to send the file at all $last_load = $request->header('If-Modified-Since') ? strtotime(trim($request->header('If-Modified-Since'))) : false; if (strpos(strtolower($browser), 'msie 6.0') === false && !phpbb_is_greater_ie_version($browser, 7)) { if ($last_load !== false && $last_load >= $stamp) { send_status_line(304, 'Not Modified'); // seems that we need those too ... browsers header('Cache-Control: private'); header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT'); return true; } else { header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $stamp) . ' GMT'); } } return false; } /** * Garbage Collection * * @param bool $exit Whether to die or not. * * @return null */ function file_gc($exit = true) { global $cache, $db; if (!empty($cache)) { $cache->unload(); } $db->sql_close(); if ($exit) { exit; } } /** * HTTP range support (RFC 2616 Section 14.35) * * Allows browsers to request partial file content * in case a download has been interrupted. * * @param int $filesize the size of the file in bytes we are about to deliver * * @return mixed false if the whole file has to be delivered * associative array on success */ function phpbb_http_byte_range($filesize) { // Only call find_range_request() once. static $request_array; if (!$filesize) { return false; } if (!isset($request_array)) { $request_array = phpbb_find_range_request(); } return (empty($request_array)) ? false : phpbb_parse_range_request($request_array, $filesize); } /** * Searches for HTTP range request in request headers. * * @return mixed false if no request found * array of strings containing the requested ranges otherwise * e.g. array(0 => '0-0', 1 => '123-125') */ function phpbb_find_range_request() { global $request; $value = $request->header('Range'); // Make sure range request starts with "bytes=" if (strpos($value, 'bytes=') === 0) { // Strip leading 'bytes=' // Multiple ranges can be separated by a comma return explode(',', substr($value, 6)); } return false; } /** * Analyses a range request array. * * A range request can contain multiple ranges, * we however only handle the first request and * only support requests from a given byte to the end of the file. * * @param array $request_array array of strings containing the requested ranges * @param int $filesize the full size of the file in bytes that has been requested * * @return mixed false if the whole file has to be delivered * associative array on success * byte_pos_start the first byte position, can be passed to fseek() * byte_pos_end the last byte position * bytes_requested the number of bytes requested * bytes_total the full size of the file */ function phpbb_parse_range_request($request_array, $filesize) { $first_byte_pos = -1; $last_byte_pos = -1; // Go through all ranges foreach ($request_array as $range_string) { $range = explode('-', trim($range_string)); // "-" is invalid, "0-0" however is valid and means the very first byte. if (count($range) != 2 || $range[0] === '' && $range[1] === '') { continue; } // Substitute defaults if ($range[0] === '') { $range[0] = 0; } if ($range[1] === '') { $range[1] = $filesize - 1; } if ($last_byte_pos >= 0 && $last_byte_pos + 1 != $range[0]) { // We only support contiguous ranges, no multipart stuff :( return false; } if ($range[1] && $range[1] < $range[0]) { // The requested range contains 0 bytes. continue; } // Return bytes from $range[0] to $range[1] if ($first_byte_pos < 0) { $first_byte_pos = (int) $range[0]; } $last_byte_pos = (int) $range[1]; if ($first_byte_pos >= $filesize) { // Requested range not satisfiable return false; } // Adjust last-byte-pos if it is absent or greater than the content. if ($range[1] === '' || $last_byte_pos >= $filesize) { $last_byte_pos = $filesize - 1; } } if ($first_byte_pos < 0 || $last_byte_pos < 0) { return false; } return array( 'byte_pos_start' => $first_byte_pos, 'byte_pos_end' => $last_byte_pos, 'bytes_requested' => $last_byte_pos - $first_byte_pos + 1, 'bytes_total' => $filesize, ); } /** * Increments the download count of all provided attachments * * @param \phpbb\db\driver\driver_interface $db The database object * @param array|int $ids The attach_id of each attachment * * @return null */ function phpbb_increment_downloads($db, $ids) { if (!is_array($ids)) { $ids = array($ids); } $sql = 'UPDATE ' . ATTACHMENTS_TABLE . ' SET download_count = download_count + 1 WHERE ' . $db->sql_in_set('attach_id', $ids); $db->sql_query($sql); } /** * Handles authentication when downloading attachments from a post or topic * * @param \phpbb\db\driver\driver_interface $db The database object * @param \phpbb\auth\auth $auth The authentication object * @param int $topic_id The id of the topic that we are downloading from * * @return null */ function phpbb_download_handle_forum_auth($db, $auth, $topic_id) { global $phpbb_container; $sql_array = [ 'SELECT' => 't.forum_id, t.topic_poster, t.topic_visibility, f.forum_name, f.forum_password, f.parent_id', 'FROM' => [ TOPICS_TABLE => 't', FORUMS_TABLE => 'f', ], 'WHERE' => 't.topic_id = ' . (int) $topic_id . ' AND t.forum_id = f.forum_id', ]; $sql = $db->sql_build_query('SELECT', $sql_array); $result = $db->sql_query($sql); $row = $db->sql_fetchrow($result); $db->sql_freeresult($result); $phpbb_content_visibility = $phpbb_container->get('content.visibility'); if ($row && !$phpbb_content_visibility->is_visible('topic', $row['forum_id'], $row)) { send_status_line(404, 'Not Found'); trigger_error('ERROR_NO_ATTACHMENT'); } else if ($row && $auth->acl_get('u_download') && $auth->acl_get('f_download', $row['forum_id'])) { if ($row['forum_password']) { // Do something else ... ? login_forum_box($row); } } else { send_status_line(403, 'Forbidden'); trigger_error('SORRY_AUTH_VIEW_ATTACH'); } } /** * Handles authentication when downloading attachments from PMs * * @param \phpbb\db\driver\driver_interface $db The database object * @param \phpbb\auth\auth $auth The authentication object * @param int $user_id The user id * @param int $msg_id The id of the PM that we are downloading from * * @return null */ function phpbb_download_handle_pm_auth($db, $auth, $user_id, $msg_id) { global $phpbb_dispatcher; if (!$auth->acl_get('u_pm_download')) { send_status_line(403, 'Forbidden'); trigger_error('SORRY_AUTH_VIEW_ATTACH'); } $allowed = phpbb_download_check_pm_auth($db, $user_id, $msg_id); /** * Event to modify PM attachments download auth * * @event core.modify_pm_attach_download_auth * @var bool allowed Whether the user is allowed to download from that PM or not * @var int msg_id The id of the PM to download from * @var int user_id The user id for auth check * @since 3.1.11-RC1 */ $vars = array('allowed', 'msg_id', 'user_id'); extract($phpbb_dispatcher->trigger_event('core.modify_pm_attach_download_auth', compact($vars))); if (!$allowed) { send_status_line(403, 'Forbidden'); trigger_error('ERROR_NO_ATTACHMENT'); } } /** * Checks whether a user can download from a particular PM * * @param \phpbb\db\driver\driver_interface $db The database object * @param int $user_id The user id * @param int $msg_id The id of the PM that we are downloading from * * @return bool Whether the user is allowed to download from that PM or not */ function phpbb_download_check_pm_auth($db, $user_id, $msg_id) { // Check if the attachment is within the users scope... $sql = 'SELECT msg_id FROM ' . PRIVMSGS_TO_TABLE . ' WHERE msg_id = ' . (int) $msg_id . ' AND ( user_id = ' . (int) $user_id . ' OR author_id = ' . (int) $user_id . ' )'; $result = $db->sql_query_limit($sql, 1); $allowed = (bool) $db->sql_fetchfield('msg_id'); $db->sql_freeresult($result); return $allowed; } /** * Check if the browser is internet explorer version 7+ * * @param string $user_agent User agent HTTP header * @param int $version IE version to check against * * @return bool true if internet explorer version is greater than $version */ function phpbb_is_greater_ie_version($user_agent, $version) { if (preg_match('/msie (\d+)/', strtolower($user_agent), $matches)) { $ie_version = (int) $matches[1]; return ($ie_version > $version); } else { return false; } }