|
+-----------------------------------------------------------------------+
*/
// show loading page
if (!empty($_GET['_preload'])) {
$_get = $_GET + array('_mimewarning' => 1, '_embed' => 1);
unset($_get['_preload']);
$url = $RCMAIL->url($_get);
$message = $RCMAIL->gettext('loadingdata');
header('Content-Type: text/html; charset=' . RCUBE_CHARSET);
print "\n\n"
. '' . "\n"
. '' . "\n"
. "\n\n$message\n\n";
exit;
}
ob_end_clean();
// similar code as in program/steps/mail/show.inc
if (!empty($_GET['_uid'])) {
$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GET);
$RCMAIL->config->set('prefer_html', true);
$MESSAGE = new rcube_message($uid, null, intval($_GET['_safe']));
}
// check connection status
check_storage_status();
$part_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC);
// show part page
if (!empty($_GET['_frame'])) {
if ($part_id && ($part = $MESSAGE->mime_parts[$part_id])) {
$filename = rcmail_attachment_name($part);
$OUTPUT->set_pagetitle($filename);
}
// register UI objects
$OUTPUT->add_handlers(array(
'messagepartframe' => 'rcmail_message_part_frame',
'messagepartcontrols' => 'rcmail_message_part_controls',
));
$mimetype = $part ? rcmail_fix_mimetype($part->mimetype) : '';
// 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);
$OUTPUT->send('messagepart');
exit;
}
// render thumbnail of an image attachment
else if ($_GET['_thumb']) {
$pid = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GET);
if ($part = $MESSAGE->mime_parts[$pid]) {
$thumbnail_size = $RCMAIL->config->get('image_thumbnail_size', 240);
$temp_dir = $RCMAIL->config->get('temp_dir');
$mimetype = $part->mimetype;
$file_ident = $MESSAGE->headers->messageID . ':' . $part->mime_id . ':' . $part->size . ':' . $part->mimetype;
$cache_basename = $temp_dir . '/' . md5($file_ident . ':' . $RCMAIL->user->ID . ':' . $thumbnail_size);
$cache_file = $cache_basename . '.thumb';
// render thumbnail image if not done yet
if (!is_file($cache_file)) {
if ($fp = fopen(($orig_name = $cache_basename . '.tmp'), 'w')) {
$MESSAGE->get_part_body($part->mime_id, false, 0, $fp);
fclose($fp);
$image = new rcube_image($orig_name);
if ($imgtype = $image->resize($thumbnail_size, $cache_file, true)) {
$mimetype = 'image/' . $imgtype;
unlink($orig_name);
}
else if (stripos($mimetype, 'image/svg') === 0) {
$content = rcmail_svg_filter(file_get_contents($orig_name));
file_put_contents($cache_file, $content);
unlink($orig_name);
}
else {
rename($orig_name, $cache_file);
}
}
}
if (is_file($cache_file)) {
header('Content-Type: ' . $mimetype);
readfile($cache_file);
}
}
exit;
}
else if (strlen($part_id)) {
if ($part = $MESSAGE->mime_parts[$part_id]) {
$mimetype = rcmail_fix_mimetype($part->mimetype);
// allow post-processing of the message body
$plugin = $RCMAIL->plugins->exec_hook('message_part_get', array(
'uid' => $MESSAGE->uid,
'id' => $part->mime_id,
'mimetype' => $mimetype,
'part' => $part,
'download' => !empty($_GET['_download'])
));
if ($plugin['abort']) {
exit;
}
// require CSRF protected url for downloads
if ($plugin['download'])
$RCMAIL->request_security_check(rcube_utils::INPUT_GET);
// overwrite modified vars from plugin
$mimetype = $plugin['mimetype'];
$extensions = rcube_mime::get_mime_extensions($mimetype);
if ($plugin['body']) {
$body = $plugin['body'];
}
// compare file mimetype with the stated content-type headers and file extension to avoid malicious operations
if (!empty($_REQUEST['_embed']) && empty($_REQUEST['_nocheck'])) {
$file_extension = strtolower(pathinfo($part->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 = $body ?: $MESSAGE->get_part_body($part->mime_id, false, 2048);
// detect message part mimetype
$real_mimetype = rcube_mime::file_content_type($tmp_body, $part->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' && $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" real mimetype the same way the original is before comparison
$real_mimetype = rcmail_fix_mimetype($real_mimetype);
$valid = $real_mimetype == $mimetype && $valid_extension;
}
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;
}
else { // html warning with a button to load the file anyway
$OUTPUT = new rcmail_html_page();
$OUTPUT->write(html::tag('html', null, html::tag('body', 'embed',
html::div(array('class' => 'rcmail-inline-message rcmail-inline-warning'),
$RCMAIL->gettext(array(
'name' => 'attachmentvalidationerror',
'vars' => array(
'expected' => $mimetype . ($file_extension ? " (.$file_extension)" : ''),
'detected' => $real_mimetype . ($extensions[0] ? " (.$extensions[0])" : ''),
)
))
. html::p(array('class' => 'rcmail-inline-buttons'),
html::tag('button', array(
'onclick' => "location.href='" . $RCMAIL->url(array_merge($_GET, array('_nocheck' => 1))) . "'"
),
$RCMAIL->gettext('showanyway'))
)
))));
}
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
&& rcmail_part_image_type($part) == 'image/' . $type
&& rcube_image::is_convertable('image/' . $type)
) {
$convert2jpeg = true;
$mimetype = 'image/jpeg';
break;
}
}
$browser = $RCMAIL->output->browser;
list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
if (!$plugin['download'] && $ctype_primary == 'text') {
header("Content-Type: text/$ctype_secondary; charset=" . ($part->charset ?: RCUBE_CHARSET));
}
else {
header("Content-Type: $mimetype");
header("Content-Transfer-Encoding: binary");
}
// deliver part content
if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($plugin['download'])) {
// 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($part->size * 10)) {
$out = '' . $RCMAIL->gettext('messagetoobig'). ' '
. html::a('?_task=mail&_action=get&_download=1&_uid='.$MESSAGE->uid.'&_part='.$part->mime_id
.'&_mbox='. urlencode($MESSAGE->folder), $RCMAIL->gettext('download')) . '