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diff --git a/program/steps/mail/get.inc b/program/steps/mail/get.inc
index dc3124dea..90aee3004 100644
--- a/program/steps/mail/get.inc
+++ b/program/steps/mail/get.inc
@@ -1,724 +1,724 @@
<?php
/**
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| |
| Copyright (C) The Roundcube Dev Team |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Delivering a specific uploaded file or mail message attachment |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
*/
// This resets X-Frame-Options for framed output (#6688)
$OUTPUT->page_headers();
// show loading page
if (!empty($_GET['_preload'])) {
unset($_GET['_preload']);
unset($_GET['_safe']);
$url = $RCMAIL->url($_GET + array('_mimewarning' => 1, '_embed' => 1));
$message = $RCMAIL->gettext('loadingdata');
header('Content-Type: text/html; charset=' . RCUBE_CHARSET);
print "<html>\n<head>\n"
. '<meta http-equiv="refresh" content="0; url='.rcube::Q($url).'">' . "\n"
. '<meta http-equiv="content-type" content="text/html; charset='.RCUBE_CHARSET.'">' . "\n"
. "</head>\n<body>\n$message\n</body>\n</html>";
exit;
}
$attachment = new rcmail_attachment_handler;
$mimetype = $attachment->mimetype;
$filename = $attachment->filename;
// show part page
if (!empty($_GET['_frame'])) {
$OUTPUT->set_pagetitle($filename);
// register UI objects
$OUTPUT->add_handlers(array(
'messagepartframe' => 'rcmail_message_part_frame',
'messagepartcontrols' => 'rcmail_message_part_controls',
));
$part_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GET);
$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GET);
// message/rfc822 preview (Note: handle also multipart/ parts, they can
// come from Enigma, which replaces message/rfc822 with real mimetype)
if ($part_id && ($mimetype == 'message/rfc822' || strpos($mimetype, 'multipart/') === 0)) {
$uid = preg_replace('/\.[0-9.]+/', '', $uid);
$uid .= '.' . $part_id;
$OUTPUT->set_env('is_message', true);
}
$OUTPUT->set_env('mailbox', $RCMAIL->storage->get_folder());
$OUTPUT->set_env('uid', $uid);
$OUTPUT->set_env('part', $part_id);
$OUTPUT->set_env('filename', $filename);
$OUTPUT->set_env('mimetype', $mimetype);
$OUTPUT->send('messagepart');
exit;
}
// render thumbnail of an image attachment
if (!empty($_GET['_thumb']) && $attachment->is_valid()) {
$thumbnail_size = $RCMAIL->config->get('image_thumbnail_size', 240);
$file_ident = $attachment->ident;
$thumb_name = 'thumb' . md5($file_ident . ':' . $RCMAIL->user->ID . ':' . $thumbnail_size);
$cache_file = rcube_utils::temp_filename($thumb_name, false, false);
// render thumbnail image if not done yet
if (!is_file($cache_file) && $attachment->body_to_file($orig_name = $cache_file . '.tmp')) {
$image = new rcube_image($orig_name);
if ($imgtype = $image->resize($thumbnail_size, $cache_file, true)) {
$mimetype = 'image/' . $imgtype;
}
else {
// Resize failed, we need to check the file mimetype
// So, we do not exit here, but goto generic file body handler below
$_GET['_thumb'] = 0;
$_REQUEST['_embed'] = 1;
}
}
if (!empty($_GET['_thumb'])) {
if (is_file($cache_file)) {
$RCMAIL->output->future_expire_header(3600);
header('Content-Type: ' . $mimetype);
header('Content-Length: ' . filesize($cache_file));
readfile($cache_file);
}
exit;
}
}
// Handle attachment body (display or download)
if (empty($_GET['_thumb']) && $attachment->is_valid()) {
// require CSRF protected url for downloads
if (!empty($_GET['_download'])) {
$RCMAIL->request_security_check(rcube_utils::INPUT_GET);
}
$extensions = rcube_mime::get_mime_extensions($mimetype);
// compare file mimetype with the stated content-type headers and file extension to avoid malicious operations
if (!empty($_REQUEST['_embed']) && empty($_REQUEST['_nocheck'])) {
$file_extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
// 1. compare filename suffix with expected suffix derived from mimetype
$valid = $file_extension && in_array($file_extension, (array)$extensions) || empty($extensions) || !empty($_REQUEST['_mimeclass']);
// 2. detect the real mimetype of the attachment part and compare it with the stated mimetype and filename extension
if ($valid || !$file_extension || $mimetype == 'application/octet-stream' || stripos($mimetype, 'text/') === 0) {
$tmp_body = $attachment->body(2048);
// detect message part mimetype
$real_mimetype = rcube_mime::file_content_type($tmp_body, $filename, $mimetype, true, true);
list($real_ctype_primary, $real_ctype_secondary) = explode('/', $real_mimetype);
// accept text/plain with any extension
if ($real_mimetype == 'text/plain' && rcmail_mimetype_compare($real_mimetype, $mimetype)) {
$valid_extension = true;
}
// ignore differences in text/* mimetypes. Filetype detection isn't very reliable here
else if ($real_ctype_primary == 'text' && strpos($mimetype, $real_ctype_primary) === 0) {
$real_mimetype = $mimetype;
$valid_extension = true;
}
// ignore filename extension if mimeclass matches (#1489029)
else if (!empty($_REQUEST['_mimeclass']) && $real_ctype_primary == $_REQUEST['_mimeclass']) {
$valid_extension = true;
}
else {
// get valid file extensions
$extensions = rcube_mime::get_mime_extensions($real_mimetype);
$valid_extension = !$file_extension || empty($extensions) || in_array($file_extension, (array)$extensions);
}
// fix mimetype for images wrongly declared as octet-stream
if ($mimetype == 'application/octet-stream' && strpos($real_mimetype, 'image/') === 0 && $valid_extension) {
$mimetype = $real_mimetype;
}
// fix mimetype for images with wrong mimetype
else if (strpos($real_mimetype, 'image/') === 0 && strpos($mimetype, 'image/') === 0) {
$mimetype = $real_mimetype;
}
// "fix" real mimetype the same way the original is before comparison
$real_mimetype = rcmail_fix_mimetype($real_mimetype);
$valid = $valid_extension && rcmail_mimetype_compare($real_mimetype, $mimetype);
}
else {
$real_mimetype = $mimetype;
}
// show warning if validity checks failed
if (!$valid) {
// send blocked.gif for expected images
if (empty($_REQUEST['_mimewarning']) && strpos($mimetype, 'image/') === 0) {
// Do not cache. Failure might be the result of a misconfiguration, thus real content should be returned once fixed.
$content = $RCMAIL->get_resource_content('blocked.gif');
$OUTPUT->nocacheing_headers();
header("Content-Type: image/gif");
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . strlen($content));
echo $content;
}
// html warning with a button to load the file anyway
else {
$OUTPUT = new rcmail_html_page();
$OUTPUT->register_inline_warning(
$RCMAIL->gettext(array(
'name' => 'attachmentvalidationerror',
'vars' => array(
'expected' => $mimetype . ($file_extension ? " (.$file_extension)" : ''),
'detected' => $real_mimetype . ($extensions[0] ? " (.$extensions[0])" : ''),
)
)
),
$RCMAIL->gettext('showanyway'),
$RCMAIL->url(array_merge($_GET, array('_nocheck' => 1)))
);
$OUTPUT->write();
}
exit;
}
}
// TIFF/WEBP to JPEG conversion, if needed
foreach (array('tiff', 'webp') as $type) {
$img_support = !empty($_SESSION['browser_caps']) && !empty($_SESSION['browser_caps'][$type]);
if (!empty($_REQUEST['_embed']) && !$img_support
&& $attachment->image_type() == 'image/' . $type
&& rcube_image::is_convertable('image/' . $type)
) {
$convert2jpeg = true;
$mimetype = 'image/jpeg';
break;
}
}
// deliver part content
if ($mimetype == 'text/html' && empty($_GET['_download'])) {
$OUTPUT = new rcmail_html_page();
// Check if we have enough memory to handle the message in it
// #1487424: we need up to 10x more memory than the body
if (!rcube_utils::mem_check($attachment->size * 10)) {
$OUTPUT->register_inline_warning(
$RCMAIL->gettext('messagetoobig'),
$RCMAIL->gettext('download'),
$RCMAIL->url(array_merge($_GET, array('_download' => 1)))
);
}
else {
// render HTML body
$out = $attachment->html();
// insert remote objects warning into HTML body
if ($REMOTE_OBJECTS) {
$OUTPUT->register_inline_warning(
$RCMAIL->gettext('blockedresources'),
$RCMAIL->gettext('allow'),
$RCMAIL->url(array_merge($_GET, array('_safe' => 1)))
);
}
}
$OUTPUT->write($out);
exit;
}
// add filename extension if missing
if (!pathinfo($filename, PATHINFO_EXTENSION) && ($extensions = rcube_mime::get_mime_extensions($mimetype))) {
$filename .= '.' . $extensions[0];
}
$OUTPUT->download_headers($filename, array(
'type' => $mimetype,
'type_charset' => $attachment->charset,
'disposition' => !empty($_GET['_download']) ? 'attachment' : 'inline',
));
// handle tiff to jpeg conversion
if (!empty($convert2jpeg)) {
$file_path = rcube_utils::temp_filename('attmnt');
// convert image to jpeg and send it to the browser
if ($attachment->body_to_file($file_path)) {
$image = new rcube_image($file_path);
if ($image->convert(rcube_image::TYPE_JPG, $file_path)) {
header("Content-Length: " . filesize($file_path));
readfile($file_path);
}
}
}
else {
$attachment->output($mimetype);
}
exit;
}
// if we arrive here, the requested part was not found
header('HTTP/1.1 404 Not Found');
exit;
/**
* Compares two mimetype strings with making sure that
* e.g. image/bmp and image/x-ms-bmp are treated as equal.
*/
function rcmail_mimetype_compare($type1, $type2)
{
- $regexp = '|/(x-|x-ms-)|';
+ $regexp = '~/(x-|x-ms-)~';
$type1 = preg_replace($regexp, '/', $type1);
$type2 = preg_replace($regexp, '/', $type2);
return $type1 === $type2;
}
/**
* Attachment properties table
*/
function rcmail_message_part_controls($attrib)
{
global $attachment, $RCMAIL;
if (!$attachment->is_valid()) {
return '';
}
$table = new html_table(array('cols' => 2));
$table->add('title', rcube::Q($RCMAIL->gettext('namex')).':');
$table->add('header', rcube::Q($attachment->filename));
$table->add('title', rcube::Q($RCMAIL->gettext('type')).':');
$table->add('header', rcube::Q($attachment->mimetype));
$table->add('title', rcube::Q($RCMAIL->gettext('size')).':');
$table->add('header', rcube::Q($attachment->size()));
return $table->show($attrib);
}
/**
* Attachment preview frame
*/
function rcmail_message_part_frame($attrib)
{
global $RCMAIL;
if ($RCMAIL->output->get_env('is_message')) {
$url = array(
'task' => 'mail',
'action' => 'preview',
'uid' => $RCMAIL->output->get_env('uid'),
'mbox' => $RCMAIL->output->get_env('mailbox'),
);
}
else {
$mimetype = $RCMAIL->output->get_env('mimetype');
$url = $_GET;
$url[strpos($mimetype, 'text/') === 0 ? '_embed' : '_preload'] = 1;
unset($url['_frame']);
}
$url['_framed'] = 1; // For proper X-Frame-Options:deny handling
$attrib['src'] = $RCMAIL->url($url);
$RCMAIL->output->add_gui_object('messagepartframe', $attrib['id']);
return html::iframe($attrib);
}
/**
* Wrapper class with unified access to attachment properties and body
*
* Unified for message parts as well as uploaded attachments
*/
class rcmail_attachment_handler
{
public $filename;
public $size;
public $mimetype;
public $ident;
public $charset = RCUBE_CHARSET;
private $message;
private $part;
private $upload;
private $body;
private $body_file;
private $download = false;
/**
* Class constructor.
* Reads request parameters and initializes attachment/part props.
*/
public function __construct()
{
ob_end_clean();
$part_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GET);
$file_id = rcube_utils::get_input_value('_file', rcube_utils::INPUT_GET);
$compose_id = rcube_utils::get_input_value('_id', rcube_utils::INPUT_GET);
$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GET);
$rcube = rcube::get_instance();
$this->download = !empty($_GET['_download']);
// similar code as in program/steps/mail/show.inc
if (!empty($uid)) {
$rcube->config->set('prefer_html', true);
$this->message = new rcube_message($uid, null, intval($_GET['_safe']));
if ($this->part = $this->message->mime_parts[$part_id]) {
$this->filename = rcmail_attachment_name($this->part);
$this->mimetype = $this->part->mimetype;
$this->size = $this->part->size;
$this->ident = $this->message->headers->messageID . ':' . $this->part->mime_id . ':' . $this->size . ':' . $this->mimetype;
$this->charset = $this->part->charset ?: RCUBE_CHARSET;
if (empty($_GET['_frame'])) {
// allow post-processing of the attachment body
$plugin = $rcube->plugins->exec_hook('message_part_get', array(
'uid' => $uid,
'id' => $this->part->mime_id,
'mimetype' => $this->mimetype,
'part' => $this->part,
'download' => $this->download,
));
if ($plugin['abort']) {
exit;
}
// overwrite modified vars from plugin
$this->mimetype = $plugin['mimetype'];
if ($plugin['body']) {
$this->body = $plugin['body'];
$this->size = strlen($this->body);
}
}
}
}
else if ($file_id && $compose_id) {
$file_id = preg_replace('/^rcmfile/', '', $file_id);
if (($compose = $_SESSION['compose_data_' . $compose_id])
&& ($this->upload = $compose['attachments'][$file_id])
) {
$this->filename = $this->upload['name'];
$this->mimetype = $this->upload['mimetype'];
$this->size = $this->upload['size'];
$this->ident = sprintf('%s:%s%s', $compose_id, $file_id, $this->size);
$this->charset = $this->upload['charset'] ?: RCUBE_CHARSET;
}
}
if (empty($this->part) && empty($this->upload)) {
header('HTTP/1.1 404 Not Found');
exit;
}
// check connection status
self::check_storage_status();
$this->mimetype = rcmail_fix_mimetype($this->mimetype);
}
/**
* Remove temp files, etc.
*/
public function __destruct()
{
if ($this->body_file) {
@unlink($this->body_file);
}
}
/**
* Check if the object is a message part not uploaded file
*
* @return bool True if the object is a meesage part
*/
public function is_message_part()
{
return !empty($this->message);
}
/**
* Object/request status
*
* @return bool Status
*/
public function is_valid()
{
return !empty($this->part) || !empty($this->upload);
}
/**
* Return attachment/part mimetype if this is an image
* of supported type.
*
* @return string Image mimetype
*/
public function image_type()
{
$part = (object) array(
'filename' => $this->filename,
'mimetype' => $this->mimetype,
);
return rcmail_part_image_type($part);
}
/**
* Formatted attachment/part size (with units)
*
* @return string Attachment/part size (with units)
*/
public function size()
{
$part = $this->part ?: ((object) array('size' => $this->size, 'exact_size' => true));
return rcube::get_instance()->message_part_size($part);
}
/**
* Returns, prints or saves the attachment/part body
*/
public function body($size = null, $fp = null)
{
// we may have the body in memory or file already
if ($this->body !== null) {
if ($fp == -1) {
echo $size ? substr($this->body, 0, $size) : $this->body;
}
else if ($fp) {
$result = fwrite($fp, $size ? substr($this->body, $size) : $this->body) !== false;
}
else {
$result = $size ? substr($this->body, 0, $size) : $this->body;
}
}
else if ($this->body_file) {
if ($size) {
$result = file_get_contents($this->body_file, false, null, 0, $size);
}
else {
$result = file_get_contents($this->body_file);
}
if ($fp == -1) {
echo $result;
}
else if ($fp) {
$result = fwrite($fp, $result) !== false;
}
}
else if ($this->message) {
$result = $this->message->get_part_body($this->part->mime_id, false, 0, $fp);
// check connection status
if (!$fp && $this->size && empty($result)) {
self::check_storage_status();
}
}
else if ($this->upload) {
// This hook retrieves the attachment contents from the file storage backend
$attachment = rcube::get_instance()->plugins->exec_hook('attachment_get', $this->upload);
if ($fp && $fp != -1) {
if ($attachment['data']) {
$result = fwrite($fp, $size ? substr($attachment['data'], 0, $size) : $attachment['data']) !== false;
}
else if ($attachment['path']) {
if ($fh = fopen($attachment['path'], 'rb')) {
$result = stream_copy_to_stream($fh, $fp, $size ? $size : -1);
}
}
}
else {
$data = $attachment['data'];
if (!$data && $attachment['path']) {
$data = file_get_contents($attachment['path']);
}
if ($fp == -1) {
echo $size ? substr($data, 0, $size) : $data;
}
else {
$result = $size ? substr($data, 0, $size) : $data;
}
}
}
return $result;
}
/**
* Save the body to a file
*
* @param string $filename File name with path
*
* @return bool True on success, False on failure
*/
public function body_to_file($filename)
{
if ($filename && $this->size && ($fp = fopen($filename, 'w'))) {
$this->body(0, $fp);
$this->body_file = $filename;
fclose($fp);
@chmod(filename, 0600);
return true;
}
return false;
}
/**
* Output attachment body with content filtering
*/
public function output($mimetype)
{
if (!$this->size) {
return false;
}
$secure = stripos($mimetype, 'image/') === false || $this->download;
// Remove <script> in SVG images
if (!$secure && stripos($mimetype, 'image/svg') === 0) {
if (!$this->body) {
$this->body = $this->body();
if (empty($this->body)) {
return false;
}
}
echo self::svg_filter($this->body);
return true;
}
if ($this->body !== null && !$this->download) {
header("Content-Length: " . strlen($this->body));
echo $this->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 $this->body(0, -1);
}
/**
* Returns formatted HTML if the attachment is HTML
*/
public function html()
{
list($type, $subtype) = explode($this->mimetype, '/');
$part = (object) array(
'charset' => $this->charset,
'ctype_secondary' => $subtype,
);
// get part body if not available
// fix formatting and charset
$body = rcube_message::format_part_body($this->body(), $part);
// show images?
$is_safe = $this->is_safe();
return rcmail_wash_html($body, array('safe' => $is_safe, 'inline_html' => false));
}
/**
* Remove <script> in SVG images
*/
public static function svg_filter($body)
{
// clean SVG with washtml
$wash_opts = array(
'show_washed' => false,
'allow_remote' => false,
'charset' => RCUBE_CHARSET,
'html_elements' => array('title'),
// 'blocked_src' => 'program/resources/blocked.gif',
);
// initialize HTML washer
$washer = new rcube_washtml($wash_opts);
// allow CSS styles, will be sanitized by rcmail_washtml_callback()
$washer->add_callback('style', 'rcmail_washtml_callback');
return $washer->wash($body);
}
/**
* Handles nicely storage connection errors
*/
public static function check_storage_status()
{
$error = rcmail::get_instance()->storage->get_error_code();
// Check if we have a connection error
if ($error == rcube_imap_generic::ERROR_BAD) {
ob_end_clean();
// Get action is often executed simultaneously.
// Some servers have MAXPERIP or other limits.
// To workaround this we'll wait for some time
// and try again (once).
// Note: Random sleep interval is used to minimize concurency
// in getting message parts
if (!isset($_GET['_redirected'])) {
usleep(rand(10,30)*100000); // 1-3 sec.
header('Location: ' . $_SERVER['REQUEST_URI'] . '&_redirected=1');
}
else {
rcube::raise_error(array(
'code' => 500, 'file' => __FILE__, 'line' => __LINE__,
'message' => 'Unable to get/display message part. IMAP connection error'),
true, true);
}
// Don't kill session, just quit (#1486995)
exit;
}
}
public function is_safe()
{
if ($this->message) {
return rcmail_check_safe($this->message);
}
return !empty($_GET['_safe']);
}
}

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