|
+-----------------------------------------------------------------------+
*/
// show loading page
if (!empty($_GET['_preload'])) {
$url = preg_replace('/([&?]+)_preload=/', '\\1_mimewarning=1&_embed=', $_SERVER['REQUEST_URI']);
$message = rcube_label('loadingdata');
header('Content-Type: text/html; charset=' . RCMAIL_CHARSET);
print "\n\n"
. '' . "\n"
. '' . "\n"
. "\n\n$message\n\n";
exit;
}
ob_end_clean();
// similar code as in program/steps/mail/show.inc
if (!empty($_GET['_uid'])) {
$RCMAIL->config->set('prefer_html', true);
$MESSAGE = new rcube_message(get_input_value('_uid', RCUBE_INPUT_GET));
}
// check connection status
check_storage_status();
// show part page
if (!empty($_GET['_frame'])) {
if (($part_id = get_input_value('_part', RCUBE_INPUT_GPC)) && ($part = $MESSAGE->mime_parts[$part_id])) {
$OUTPUT->set_pagetitle(rcmail_attachment_name($part));
}
$OUTPUT->send('messagepart');
exit;
}
// render thumbnail of an image attachment
else if ($_GET['_thumb']) {
$pid = get_input_value('_part', RCUBE_INPUT_GET);
if ($part = $MESSAGE->mime_parts[$pid]) {
$thumbnail_size = $RCMAIL->config->get('image_thumbnail_size', 240);
$temp_dir = $RCMAIL->config->get('temp_dir');
list(,$ext) = explode('/', $part->mimetype);
$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 . '.' . $ext;
// render thumbnail image if not done yet
if (!is_file($cache_file)) {
$fp = fopen(($orig_name = $cache_basename . '.orig.' . $ext), 'w');
$MESSAGE->get_part_content($part->mime_id, $fp);
fclose($fp);
$image = new rcube_image($orig_name);
if ($imgtype = $image->resize($thumbnail_size, $cache_file, true)) {
$mimetype = 'image/' . $imgtype;
unlink($orig_name);
}
else {
rename($orig_name, $cache_file);
}
}
if (is_file($cache_file)) {
header('Content-Type: ' . $mimetype);
readfile($cache_file);
}
}
exit;
}
else if (strlen($pid = get_input_value('_part', RCUBE_INPUT_GET))) {
if ($part = $MESSAGE->mime_parts[$pid]) {
$mimetype = rcmail_fix_mimetype($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;
// overwrite modified vars from plugin
$mimetype = $plugin['mimetype'];
$extensions = rcube_mime::get_mime_extensions($mimetype);
if ($plugin['body'])
$part->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)$extensions) || !empty($_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' || $mimetype == 'text/plain') {
if ($part->body) // part body is already loaded
$body = $part->body;
else if ($part->size && $part->size < 1024*1024) // load the entire part if it's small enough
$body = $part->body = $MESSAGE->get_part_content($part->mime_id);
else // fetch the first 2K of the message part
$body = $MESSAGE->get_part_content($part->mime_id, null, true, 2048);
// detect message part mimetype
$real_mimetype = rcube_mime::file_content_type($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)
$file_extension = 'txt';
// ignore differences in text/* mimetypes. Filetype detection isn't very reliable here
if ($real_ctype_primary == 'text' && strpos($mimetype, $real_ctype_primary) === 0)
$real_mimetype = $mimetype;
// get valid file extensions
$extensions = rcube_mime::get_mime_extensions($real_mimetype);
$valid_extension = (!$file_extension || in_array($file_extension, (array)$extensions));
// ignore filename extension if mimeclass matches (#1489029)
if (!empty($_REQUEST['_mimeclass']) && $real_ctype_primary == $_REQUEST['_mimeclass'])
$valid_extension = true;
// fix mimetype for images wrongly declared as octet-stream
if ($mimetype == 'application/octet-stream' && strpos($real_mimetype, 'image/') === 0 && $valid_extension)
$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.
$OUTPUT->nocacheing_headers();
header("Content-Type: image/gif");
header("Content-Transfer-Encoding: binary");
readfile(INSTALL_PATH . 'program/resources/blocked.gif');
}
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'),
rcube_label(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))) . "'"),
rcube_label('showanyway')))
)
)));
}
exit;
}
}
// TIFF to JPEG conversion, if needed
$tiff_support = !empty($_SESSION['browser_caps']) && !empty($_SESSION['browser_caps']['tif']);
if (!empty($_REQUEST['_embed']) && !$tiff_support
&& $RCMAIL->config->get('im_convert_path')
&& rcmail_part_image_type($part) == 'image/tiff'
) {
$tiff2jpeg = true;
$mimetype = 'image/jpeg';
}
$browser = $RCMAIL->output->browser;
list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
// send download headers
if ($plugin['download']) {
header("Content-Type: application/octet-stream");
if ($browser->ie)
header("Content-Type: application/force-download");
}
else if ($ctype_primary == 'text') {
header("Content-Type: text/$ctype_secondary; charset=" . ($part->charset ? $part->charset : RCMAIL_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 (!rcmail_mem_check($part->size * 10)) {
$out = '' . rcube_label('messagetoobig'). ' '
. html::a('?_task=mail&_action=get&_download=1&_uid='.$MESSAGE->uid.'&_part='.$part->mime_id
.'&_mbox='. urlencode($RCMAIL->storage->get_folder()), rcube_label('download')) . '