mirror of
https://github.com/roundcube/roundcubemail.git
synced 2025-12-28 07:55:07 +00:00
3e458fa5fd
* Fix "native_constant_invocation" CS * "self_accessor" was fixed in 9269 PR * "php_unit_strict" was fixed in 9268 PR
373 lines
16 KiB
PHP
373 lines
16 KiB
PHP
<?php
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/*
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+-----------------------------------------------------------------------+
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) The Roundcube Dev Team |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| PURPOSE: |
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| Delivering a specific uploaded file or mail message attachment |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-----------------------------------------------------------------------+
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*/
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class rcmail_action_mail_get extends rcmail_action_mail_index
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{
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protected static $attachment;
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/**
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* Request handler.
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*
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* @param array $args Arguments from the previous step(s)
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*/
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public function run($args = [])
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{
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$rcmail = rcmail::get_instance();
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// This resets X-Frame-Options for framed output (#6688)
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$rcmail->output->page_headers();
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// show loading page
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if (!empty($_GET['_preload'])) {
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unset($_GET['_preload']);
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unset($_GET['_safe']);
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$url = $rcmail->url($_GET + ['_mimewarning' => 1, '_embed' => 1]);
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$message = $rcmail->gettext('loadingdata');
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header('Content-Type: text/html; charset=' . RCUBE_CHARSET);
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echo "<html>\n<head>\n"
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. '<meta http-equiv="refresh" content="0; url=' . rcube::Q($url) . '">' . "\n"
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. '<meta http-equiv="content-type" content="text/html; charset=' . RCUBE_CHARSET . '">' . "\n"
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. "</head>\n<body>\n$message\n</body>\n</html>";
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exit;
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}
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$attachment = new rcmail_attachment_handler;
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$mimetype = $attachment->mimetype;
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$filename = $attachment->filename;
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self::$attachment = $attachment;
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// show part page
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if (!empty($_GET['_frame'])) {
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$rcmail->output->set_pagetitle($filename);
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// register UI objects
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$rcmail->output->add_handlers([
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'messagepartframe' => [$this, 'message_part_frame'],
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'messagepartcontrols' => [$this, 'message_part_controls'],
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]);
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$part_id = rcube_utils::get_input_string('_part', rcube_utils::INPUT_GET);
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$uid = rcube_utils::get_input_string('_uid', rcube_utils::INPUT_GET);
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// message/rfc822 preview (Note: handle also multipart/ parts, they can
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// come from Enigma, which replaces message/rfc822 with real mimetype)
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if ($part_id && ($mimetype == 'message/rfc822' || strpos($mimetype, 'multipart/') === 0)) {
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$uid = preg_replace('/\.[0-9.]+/', '', $uid);
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$uid .= '.' . $part_id;
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$rcmail->output->set_env('is_message', true);
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}
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$rcmail->output->set_env('mailbox', $rcmail->storage->get_folder());
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$rcmail->output->set_env('uid', $uid);
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$rcmail->output->set_env('part', $part_id);
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$rcmail->output->set_env('filename', $filename);
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$rcmail->output->set_env('mimetype', $mimetype);
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$rcmail->output->send('messagepart');
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}
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// render thumbnail of an image attachment
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if (!empty($_GET['_thumb']) && $attachment->is_valid()) {
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$thumbnail_size = $rcmail->config->get('image_thumbnail_size', 240);
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$file_ident = $attachment->ident;
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$thumb_name = 'thumb' . md5($file_ident . ':' . $rcmail->user->ID . ':' . $thumbnail_size);
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$cache_file = rcube_utils::temp_filename($thumb_name, false, false);
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// render thumbnail image if not done yet
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if (!is_file($cache_file) && $attachment->body_to_file($orig_name = rcube_utils::temp_filename('attmnt'))) {
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$image = new rcube_image($orig_name);
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if ($imgtype = $image->resize($thumbnail_size, $cache_file, true)) {
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$mimetype = 'image/' . $imgtype;
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}
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else {
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// Resize failed, we need to check the file mimetype
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// So, we do not exit here, but goto generic file body handler below
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$_GET['_thumb'] = 0;
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$_REQUEST['_embed'] = 1;
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}
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}
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if (!empty($_GET['_thumb'])) {
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if (is_file($cache_file)) {
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$rcmail->output->future_expire_header(3600);
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header('Content-Type: ' . $mimetype);
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header('Content-Length: ' . filesize($cache_file));
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readfile($cache_file);
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}
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exit;
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}
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}
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// Handle attachment body (display or download)
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if (empty($_GET['_thumb']) && $attachment->is_valid()) {
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// require CSRF protected url for downloads
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if (!empty($_GET['_download'])) {
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$rcmail->request_security_check(rcube_utils::INPUT_GET);
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}
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$extensions = rcube_mime::get_mime_extensions($mimetype);
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// compare file mimetype with the stated content-type headers and file extension to avoid malicious operations
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if (!empty($_REQUEST['_embed']) && empty($_REQUEST['_nocheck'])) {
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$file_extension = strtolower(pathinfo($filename, \PATHINFO_EXTENSION));
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// 1. compare filename suffix with expected suffix derived from mimetype
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$valid = $file_extension && in_array($file_extension, (array) $extensions)
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|| empty($extensions)
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|| !empty($_REQUEST['_mimeclass']);
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// 2. detect the real mimetype of the attachment part and compare it with the stated mimetype and filename extension
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if ($valid || !$file_extension || $mimetype == 'application/octet-stream' || stripos($mimetype, 'text/') === 0) {
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$tmp_body = $attachment->body(2048);
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// detect message part mimetype
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$real_mimetype = rcube_mime::file_content_type($tmp_body, $filename, $mimetype, true, true);
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[$real_ctype_primary, $real_ctype_secondary] = explode('/', $real_mimetype);
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// accept text/plain with any extension
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if ($real_mimetype == 'text/plain' && self::mimetype_compare($real_mimetype, $mimetype)) {
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$valid_extension = true;
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}
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// ignore differences in text/* mimetypes. Filetype detection isn't very reliable here
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elseif ($real_ctype_primary == 'text' && strpos($mimetype, $real_ctype_primary) === 0) {
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$real_mimetype = $mimetype;
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$valid_extension = true;
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}
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// ignore filename extension if mimeclass matches (#1489029)
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elseif (!empty($_REQUEST['_mimeclass']) && $real_ctype_primary == $_REQUEST['_mimeclass']) {
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$valid_extension = true;
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}
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else {
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// get valid file extensions
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$extensions = rcube_mime::get_mime_extensions($real_mimetype);
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$valid_extension = !$file_extension || empty($extensions) || in_array($file_extension, (array) $extensions);
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}
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if (
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// fix mimetype for files wrongly declared as octet-stream
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($mimetype == 'application/octet-stream' && $valid_extension)
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// force detected mimetype for images (#8158)
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|| (strpos($real_mimetype, 'image/') === 0)
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) {
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$mimetype = $real_mimetype;
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}
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// "fix" real mimetype the same way the original is before comparison
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$real_mimetype = rcube_mime::fix_mimetype($real_mimetype);
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$valid = $valid_extension && self::mimetype_compare($real_mimetype, $mimetype);
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}
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else {
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$real_mimetype = $mimetype;
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}
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// show warning if validity checks failed
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if (!$valid) {
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// send blocked.gif for expected images
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if (empty($_REQUEST['_mimewarning']) && strpos($mimetype, 'image/') === 0) {
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// Do not cache. Failure might be the result of a misconfiguration,
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// thus real content should be returned once fixed.
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$content = self::get_resource_content('blocked.gif');
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$rcmail->output->nocacheing_headers();
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header("Content-Type: image/gif");
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header("Content-Transfer-Encoding: binary");
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header("Content-Length: " . strlen($content));
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echo $content;
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}
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// html warning with a button to load the file anyway
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else {
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$rcmail->output = new rcmail_html_page();
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$rcmail->output->register_inline_warning(
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$rcmail->gettext([
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'name' => 'attachmentvalidationerror',
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'vars' => [
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'expected' => $mimetype . (!empty($file_extension) ? rcube::Q(" (.{$file_extension})") : ''),
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'detected' => $real_mimetype . (!empty($extensions[0]) ? " (.{$extensions[0]})" : ''),
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],
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]),
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$rcmail->gettext('showanyway'),
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$rcmail->url(array_merge($_GET, ['_nocheck' => 1]))
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);
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$rcmail->output->write();
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}
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exit;
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}
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}
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// TIFF/WEBP to JPEG conversion, if needed
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foreach (['tiff', 'webp'] as $type) {
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$img_support = !empty($_SESSION['browser_caps']) && !empty($_SESSION['browser_caps'][$type]);
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if (
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!empty($_REQUEST['_embed'])
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&& !$img_support
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&& $attachment->image_type() == 'image/' . $type
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&& rcube_image::is_convertable('image/' . $type)
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) {
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$convert2jpeg = true;
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$mimetype = 'image/jpeg';
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break;
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}
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}
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// deliver part content
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if ($mimetype == 'text/html' && empty($_GET['_download'])) {
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$rcmail->output = new rcmail_html_page();
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$out = '';
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// Check if we have enough memory to handle the message in it
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// #1487424: we need up to 10x more memory than the body
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if (!rcube_utils::mem_check($attachment->size * 10)) {
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$rcmail->output->register_inline_warning(
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$rcmail->gettext('messagetoobig'),
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$rcmail->gettext('download'),
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$rcmail->url(array_merge($_GET, ['_download' => 1]))
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);
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}
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else {
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// render HTML body
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$out = $attachment->html();
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// insert remote objects warning into HTML body
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if (self::$REMOTE_OBJECTS) {
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$rcmail->output->register_inline_warning(
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$rcmail->gettext('blockedresources'),
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$rcmail->gettext('allow'),
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$rcmail->url(array_merge($_GET, ['_safe' => 1]))
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);
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}
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}
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$rcmail->output->write($out);
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exit;
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}
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// add filename extension if missing
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if (!pathinfo($filename, \PATHINFO_EXTENSION) && ($extensions = rcube_mime::get_mime_extensions($mimetype))) {
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$filename .= '.' . $extensions[0];
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}
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$rcmail->output->download_headers($filename, [
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'type' => $mimetype,
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'type_charset' => $attachment->charset,
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'disposition' => !empty($_GET['_download']) ? 'attachment' : 'inline',
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]);
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// handle tiff to jpeg conversion
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if (!empty($convert2jpeg)) {
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$file_path = rcube_utils::temp_filename('attmnt');
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// convert image to jpeg and send it to the browser
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if ($attachment->body_to_file($file_path)) {
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$image = new rcube_image($file_path);
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if ($image->convert(rcube_image::TYPE_JPG, $file_path)) {
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header("Content-Length: " . filesize($file_path));
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readfile($file_path);
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}
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}
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}
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else {
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$attachment->output($mimetype);
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}
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exit;
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}
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// if we arrive here, the requested part was not found
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http_response_code(404);
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exit;
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}
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/**
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* Compares two mimetype strings with making sure that
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* e.g. image/bmp and image/x-ms-bmp are treated as equal.
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*/
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public static function mimetype_compare($type1, $type2)
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{
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$regexp = '~/(x-ms-|x-)~';
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$type1 = preg_replace($regexp, '/', $type1);
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$type2 = preg_replace($regexp, '/', $type2);
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return $type1 === $type2;
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}
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/**
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* Attachment properties table
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*/
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public static function message_part_controls($attrib)
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{
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if (!self::$attachment->is_valid()) {
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return '';
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}
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$rcmail = rcmail::get_instance();
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$table = new html_table(['cols' => 2]);
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$table->add('title', rcube::Q($rcmail->gettext('namex')) . ':');
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$table->add('header', rcube::Q(self::$attachment->filename));
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$table->add('title', rcube::Q($rcmail->gettext('type')) . ':');
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$table->add('header', rcube::Q(self::$attachment->mimetype));
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$table->add('title', rcube::Q($rcmail->gettext('size')) . ':');
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$table->add('header', rcube::Q(self::$attachment->size()));
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return $table->show($attrib);
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}
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/**
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* Attachment preview frame
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*/
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public static function message_part_frame($attrib)
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{
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$rcmail = rcmail::get_instance();
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if ($rcmail->output->get_env('is_message')) {
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$url = [
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'task' => 'mail',
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'action' => 'preview',
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'uid' => $rcmail->output->get_env('uid'),
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'mbox' => $rcmail->output->get_env('mailbox'),
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];
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}
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else {
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$mimetype = $rcmail->output->get_env('mimetype');
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$url = $_GET;
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$url[strpos($mimetype, 'text/') === 0 ? '_embed' : '_preload'] = 1;
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unset($url['_frame']);
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}
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$url['_framed'] = 1; // For proper X-Frame-Options:deny handling
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$attrib['src'] = $rcmail->url($url);
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$rcmail->output->add_gui_object('messagepartframe', $attrib['id']);
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return html::iframe($attrib);
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}
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}
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