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527 lines
20 KiB
PHP
527 lines
20 KiB
PHP
<?php
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/**
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+-----------------------------------------------------------------------+
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| program/steps/mail/get.inc |
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| |
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2005-2013, The Roundcube Dev Team |
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| |
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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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| |
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| PURPOSE: |
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| Delivering a specific part of a mail message |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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+-----------------------------------------------------------------------+
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*/
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// show loading page
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if (!empty($_GET['_preload'])) {
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$_get = $_GET + array('_mimewarning' => 1, '_embed' => 1);
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unset($_get['_preload']);
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$url = $RCMAIL->url($_get);
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$message = $RCMAIL->gettext('loadingdata');
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header('Content-Type: text/html; charset=' . RCUBE_CHARSET);
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print "<html>\n<head>\n"
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. '<meta http-equiv="refresh" content="0; url='.rcube::Q($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$message\n</body>\n</html>";
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exit;
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}
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ob_end_clean();
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// similar code as in program/steps/mail/show.inc
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if (!empty($_GET['_uid'])) {
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$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GET);
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$RCMAIL->config->set('prefer_html', true);
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$MESSAGE = new rcube_message($uid, null, intval($_GET['_safe']));
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}
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// check connection status
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check_storage_status();
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$part_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC);
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// show part page
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if (!empty($_GET['_frame'])) {
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if ($part_id && ($part = $MESSAGE->mime_parts[$part_id])) {
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$filename = rcmail_attachment_name($part);
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$OUTPUT->set_pagetitle($filename);
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}
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// register UI objects
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$OUTPUT->add_handlers(array(
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'messagepartframe' => 'rcmail_message_part_frame',
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'messagepartcontrols' => 'rcmail_message_part_controls',
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));
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$OUTPUT->set_env('mailbox', $RCMAIL->storage->get_folder());
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$OUTPUT->set_env('uid', $uid);
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$OUTPUT->set_env('part', $part_id);
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$OUTPUT->set_env('filename', $filename);
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$OUTPUT->send('messagepart');
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exit;
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}
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// render thumbnail of an image attachment
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else if ($_GET['_thumb']) {
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$pid = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GET);
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if ($part = $MESSAGE->mime_parts[$pid]) {
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$thumbnail_size = $RCMAIL->config->get('image_thumbnail_size', 240);
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$temp_dir = $RCMAIL->config->get('temp_dir');
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$mimetype = $part->mimetype;
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$file_ident = $MESSAGE->headers->messageID . ':' . $part->mime_id . ':' . $part->size . ':' . $part->mimetype;
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$cache_basename = $temp_dir . '/' . md5($file_ident . ':' . $RCMAIL->user->ID . ':' . $thumbnail_size);
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$cache_file = $cache_basename . '.thumb';
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// render thumbnail image if not done yet
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if (!is_file($cache_file)) {
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if ($fp = fopen(($orig_name = $cache_basename . '.tmp'), 'w')) {
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$MESSAGE->get_part_body($part->mime_id, false, 0, $fp);
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fclose($fp);
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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/' . $imgtype;
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unlink($orig_name);
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}
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else if (stripos($mimetype, 'image/svg') === 0) {
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$content = rcmail_svg_filter(file_get_contents($orig_name));
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file_put_contents($cache_file, $content);
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unlink($orig_name);
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}
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else {
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rename($orig_name, $cache_file);
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}
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}
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}
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if (is_file($cache_file)) {
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header('Content-Type: ' . $mimetype);
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readfile($cache_file);
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}
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}
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exit;
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}
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else if (strlen($part_id)) {
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if ($part = $MESSAGE->mime_parts[$part_id]) {
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$mimetype = rcmail_fix_mimetype($part->mimetype);
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// allow post-processing of the message body
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$plugin = $RCMAIL->plugins->exec_hook('message_part_get', array(
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'uid' => $MESSAGE->uid,
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'id' => $part->mime_id,
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'mimetype' => $mimetype,
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'part' => $part,
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'download' => !empty($_GET['_download'])
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));
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if ($plugin['abort']) {
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exit;
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}
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// overwrite modified vars from plugin
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$mimetype = $plugin['mimetype'];
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$extensions = rcube_mime::get_mime_extensions($mimetype);
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if ($plugin['body']) {
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$body = $plugin['body'];
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}
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// compare file mimetype with the stated content-type headers and file extension to avoid malicious operations
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if (!empty($_REQUEST['_embed']) && empty($_REQUEST['_nocheck'])) {
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$file_extension = strtolower(pathinfo($part->filename, PATHINFO_EXTENSION));
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// 1. compare filename suffix with expected suffix derived from mimetype
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$valid = $file_extension && in_array($file_extension, (array)$extensions) || empty($extensions) || !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 = $body ?: $MESSAGE->get_part_body($part->mime_id, false, 2048);
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// detect message part mimetype
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$real_mimetype = rcube_mime::file_content_type($tmp_body, $part->filename, $mimetype, true, true);
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list($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' && $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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else if ($real_ctype_primary == 'text' && strpos($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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else if (!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)$extensions);
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}
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// fix mimetype for images wrongly declared as octet-stream
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if ($mimetype == 'application/octet-stream' && strpos($real_mimetype, 'image/') === 0 && $valid_extension) {
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$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 = rcmail_fix_mimetype($real_mimetype);
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$valid = $real_mimetype == $mimetype && $valid_extension;
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}
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else {
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$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, thus real content should be returned once fixed.
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$content = $RCMAIL->get_resource_content('blocked.gif');
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$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 $content;
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}
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else { // html warning with a button to load the file anyway
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$OUTPUT = new rcmail_html_page();
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$OUTPUT->write(html::tag('html', null, html::tag('body', 'embed',
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html::div(array('class' => 'rcmail-inline-message rcmail-inline-warning'),
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$RCMAIL->gettext(array(
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'name' => 'attachmentvalidationerror',
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'vars' => array(
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'expected' => $mimetype . ($file_extension ? " (.$file_extension)" : ''),
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'detected' => $real_mimetype . ($extensions[0] ? " (.$extensions[0])" : ''),
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)
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))
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. html::p(array('class' => 'rcmail-inline-buttons'),
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html::tag('button', array(
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'onclick' => "location.href='" . $RCMAIL->url(array_merge($_GET, array('_nocheck' => 1))) . "'"
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),
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$RCMAIL->gettext('showanyway'))
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)
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))));
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}
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exit;
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}
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}
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// TIFF to JPEG conversion, if needed
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$tiff_support = !empty($_SESSION['browser_caps']) && !empty($_SESSION['browser_caps']['tif']);
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if (!empty($_REQUEST['_embed']) && !$tiff_support
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&& rcube_image::is_convertable('image/tiff')
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&& rcmail_part_image_type($part) == 'image/tiff'
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) {
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$tiff2jpeg = true;
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$mimetype = 'image/jpeg';
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}
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$browser = $RCMAIL->output->browser;
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list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
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if (!$plugin['download'] && $ctype_primary == 'text') {
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header("Content-Type: text/$ctype_secondary; charset=" . ($part->charset ?: RCUBE_CHARSET));
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}
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else {
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header("Content-Type: $mimetype");
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header("Content-Transfer-Encoding: binary");
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}
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// deliver part content
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if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($plugin['download'])) {
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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($part->size * 10)) {
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$out = '<body>' . $RCMAIL->gettext('messagetoobig'). ' '
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. html::a('?_task=mail&_action=get&_download=1&_uid='.$MESSAGE->uid.'&_part='.$part->mime_id
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.'&_mbox='. urlencode($MESSAGE->folder), $RCMAIL->gettext('download')) . '</body></html>';
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}
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else {
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// get part body if not available
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if (!isset($body)) {
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$body = $MESSAGE->get_part_body($part->mime_id, true);
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}
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// show images?
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rcmail_check_safe($MESSAGE);
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// render HTML body
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$out = rcmail_print_body($body, $part, array('safe' => $MESSAGE->is_safe, 'inline_html' => false));
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// insert remote objects warning into HTML body
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if ($REMOTE_OBJECTS) {
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$body_start = 0;
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if ($body_pos = strpos($out, '<body')) {
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$body_start = strpos($out, '>', $body_pos) + 1;
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}
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$out = substr($out, 0, $body_start)
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. html::div(array('class' => 'rcmail-inline-message rcmail-inline-warning'),
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rcube::Q($RCMAIL->gettext('blockedimages')) . ' ' .
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html::tag('button',
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array('onclick' => "location.href='" . $RCMAIL->url(array_merge($_GET, array('_safe' => 1))) . "'"),
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rcube::Q($RCMAIL->gettext('showimages')))
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)
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. substr($out, $body_start);
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}
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}
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// check connection status
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if ($part->size && empty($body)) {
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check_storage_status();
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}
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$OUTPUT = new rcmail_html_page();
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$OUTPUT->write($out);
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}
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else {
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// don't kill the connection if download takes more than 30 sec.
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@set_time_limit(0);
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$filename = rcmail_attachment_name($part);
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if ($browser->ie)
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$filename = rawurlencode($filename);
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else
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$filename = addcslashes($filename, '"');
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$disposition = !empty($plugin['download']) ? 'attachment' : 'inline';
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// Workaround for nasty IE bug (#1488844)
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// If Content-Disposition header contains string "attachment" e.g. in filename
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// IE handles data as attachment not inline
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if ($disposition == 'inline' && $browser->ie && $browser->ver < 9) {
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$filename = str_ireplace('attachment', 'attach', $filename);
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}
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// add filename extension if missing
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if (!pathinfo($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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header("Content-Disposition: $disposition; filename=\"$filename\"");
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// handle tiff to jpeg conversion
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if (!empty($tiff2jpeg)) {
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$temp_dir = unslashify($RCMAIL->config->get('temp_dir'));
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$file_path = tempnam($temp_dir, 'rcmAttmnt');
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// write content to temp file
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if ($body) {
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$saved = file_put_contents($file_path, $body);
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}
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else if ($part->size) {
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$fd = fopen($file_path, 'w');
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$saved = $MESSAGE->get_part_body($part->mime_id, false, 0, $fd);
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fclose($fd);
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}
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// convert image to jpeg and send it to the browser
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if ($sent = $saved) {
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$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($file_path);
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}
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unlink($file_path);
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}
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}
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else {
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$sent = rcmail_message_part_output($body, $part, $mimetype, $plugin['download']);
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}
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// check connection status
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if ($part->size && !$sent) {
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check_storage_status();
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}
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}
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exit;
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}
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}
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// print message
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else {
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// send correct headers for content type
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header("Content-Type: text/html");
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$cont = "<html>\n<head><title></title>\n</head>\n<body>";
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$cont .= rcmail_message_body(array());
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$cont .= "\n</body>\n</html>";
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$OUTPUT = new rcmail_html_page();
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$OUTPUT->write($cont);
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exit;
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}
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// if we arrive here, the requested part was not found
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header('HTTP/1.1 404 Not Found');
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exit;
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/**
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* Handles nicely storage connection errors
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*/
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function check_storage_status()
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{
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$error = rcmail::get_instance()->storage->get_error_code();
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// Check if we have a connection error
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if ($error == rcube_imap_generic::ERROR_BAD) {
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ob_end_clean();
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// Get action is often executed simultanously.
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// Some servers have MAXPERIP or other limits.
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// To workaround this we'll wait for some time
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// and try again (once).
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// Note: Random sleep interval is used to minimize concurency
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// in getting message parts
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if (!isset($_GET['_redirected'])) {
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usleep(rand(10,30)*100000); // 1-3 sec.
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header('Location: ' . $_SERVER['REQUEST_URI'] . '&_redirected=1');
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}
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else {
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rcube::raise_error(array(
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'code' => 500, 'type' => 'php',
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'file' => __FILE__, 'line' => __LINE__,
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'message' => 'Unable to get/display message part. IMAP connection error'),
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true, true);
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}
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// Don't kill session, just quit (#1486995)
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exit;
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}
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}
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/**
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* Attachment properties table
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*/
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function rcmail_message_part_controls($attrib)
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{
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global $MESSAGE, $RCMAIL;
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$part = asciiwords(rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC));
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if (!is_object($MESSAGE) || !is_array($MESSAGE->parts)
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|| !($_GET['_uid'] && $_GET['_part']) || !$MESSAGE->mime_parts[$part]
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) {
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return '';
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}
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$part = $MESSAGE->mime_parts[$part];
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$table = new html_table(array('cols' => 2));
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$table->add('title', rcube::Q($RCMAIL->gettext('namex')).':');
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$table->add('header', rcube::Q(rcmail_attachment_name($part)));
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$table->add('title', rcube::Q($RCMAIL->gettext('type')).':');
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$table->add('header', rcube::Q($part->mimetype));
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$table->add('title', rcube::Q($RCMAIL->gettext('size')).':');
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$table->add('header', rcube::Q($RCMAIL->message_part_size($part)));
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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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function rcmail_message_part_frame($attrib)
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{
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global $MESSAGE, $RCMAIL;
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$part = $MESSAGE->mime_parts[asciiwords(rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC))];
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$ctype_primary = strtolower($part->ctype_primary);
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$attrib['src'] = './?' . str_replace('_frame=', ($ctype_primary=='text' ? '_embed=' : '_preload='), $_SERVER['QUERY_STRING']);
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$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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* Output attachment body with content filtering
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*/
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function rcmail_message_part_output($body, $part, $mimetype, $download)
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{
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global $MESSAGE, $RCMAIL;
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if (!$part->size && !$body) {
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return false;
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}
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$browser = $RCMAIL->output->browser;
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$secure = stripos($mimetype, 'image/') === false || $download;
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// Remove <script> in SVG images
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if (!$secure && stripos($mimetype, 'image/svg') === 0) {
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if (!$body) {
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$body = $MESSAGE->get_part_body($part->mime_id, false);
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if (empty($body)) {
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|
return false;
|
|
}
|
|
}
|
|
|
|
echo rcmail_svg_filter($body);
|
|
return true;
|
|
}
|
|
|
|
// Remove dangerous content in images for older IE (to be removed)
|
|
if (!$secure && $browser->ie && $browser->ver <= 8) {
|
|
if ($body) {
|
|
echo preg_match('/<(script|iframe|object)/i', $body) ? '' : $body;
|
|
return true;
|
|
}
|
|
else {
|
|
$stdout = fopen('php://output', 'w');
|
|
stream_filter_register('rcube_content', 'rcube_content_filter') or die('Failed to register content filter');
|
|
stream_filter_append($stdout, 'rcube_content');
|
|
return $MESSAGE->get_part_body($part->mime_id, true, 0, $stdout);
|
|
}
|
|
}
|
|
|
|
if ($body && !$download) {
|
|
header("Content-Length: " . strlen($body));
|
|
echo $body;
|
|
return true;
|
|
}
|
|
|
|
// Don't be tempted to set Content-Length to $part->d_parameters['size'] (#1490482)
|
|
// RFC2183 says "The size parameter indicates an approximate size"
|
|
|
|
return $MESSAGE->get_part_body($part->mime_id, false, 0, -1);
|
|
}
|
|
|
|
/**
|
|
* Remove <script> in SVG images
|
|
*/
|
|
function rcmail_svg_filter($body)
|
|
{
|
|
$dom = new DOMDocument;
|
|
$dom->loadXML($body);
|
|
|
|
foreach ($dom->getElementsByTagName('script') as $node) {
|
|
$node->parentNode->removeChild($node);
|
|
}
|
|
|
|
return $dom->saveXML() ?: '';
|
|
}
|