Viewing file:  get.inc (15.4 KB) -rw-r--r--
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<?php
/*
+-----------------------------------------------------------------------+
| program/steps/mail/get.inc |
| |
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2011, 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 part of a mail message |
| |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
*/
// show loading page
if (!empty($_GET['_preload'])) {
$url = preg_replace('/([&?]+)_preload=/', '\\1_mimewarning=1&_embed=', $_SERVER['REQUEST_URI']);
$message = rcube_label('loadingdata');
header('Content-Type: text/html; charset=' . RCMAIL_CHARSET);
print "<html>\n<head>\n"
. '<meta http-equiv="refresh" content="0; url='.Q($url).'">' . "\n"
. '<meta http-equiv="content-type" content="text/html; charset='.RCMAIL_CHARSET.'">' . "\n"
. "</head>\n<body>\n$message\n</body>\n</html>";
exit;
}
ob_end_clean();
// similar code as in program/steps/mail/show.inc
if (!empty($_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)) {
$out = '<body>' . rcube_label('messagetoobig'). ' '
. html::a('?_task=mail&_action=get&_download=1&_uid='.$MESSAGE->uid.'&_part='.$part->mime_id
.'&_mbox='. urlencode($RCMAIL->storage->get_folder()), rcube_label('download')) . '</body></html>';
}
else {
// get part body if not available
if (!$part->body)
$part->body = $MESSAGE->get_part_content($part->mime_id);
// show images?
rcmail_check_safe($MESSAGE);
// render HTML body
$out = rcmail_print_body($part, array('safe' => $MESSAGE->is_safe, 'inline_html' => false));
// insert remote objects warning into HTML body
if ($REMOTE_OBJECTS) {
$body_start = 0;
if ($body_pos = strpos($out, '<body')) {
$body_start = strpos($out, '>', $body_pos) + 1;
}
$out = substr($out, 0, $body_start) .
html::div(array('class' => 'rcmail-inline-message rcmail-inline-warning'),
Q(rcube_label('blockedimages')) . ' ' .
html::tag('button',
array('onclick' => "location.href='" . $RCMAIL->url(array_merge($_GET, array('_safe' => 1))) . "'"),
Q(rcube_label('showimages')))
) .
substr($out, $body_start);
}
}
// check connection status
if ($part->size && empty($part->body)) {
check_storage_status();
}
$OUTPUT = new rcube_html_page();
$OUTPUT->write($out);
}
else {
// don't kill the connection if download takes more than 30 sec.
@set_time_limit(0);
$filename = rcmail_attachment_name($part);
if ($browser->ie && $browser->ver < 7)
$filename = rawurlencode(abbreviate_string($filename, 55));
else if ($browser->ie)
$filename = rawurlencode($filename);
else
$filename = addcslashes($filename, '"');
$disposition = !empty($plugin['download']) ? 'attachment' : 'inline';
// Workaround for nasty IE bug (#1488844)
// If Content-Disposition header contains string "attachment" e.g. in filename
// IE handles data as attachment not inline
if ($disposition == 'inline' && $browser->ie && $browser->ver < 9) {
$filename = str_ireplace('attachment', 'attach', $filename);
}
// add filename extension if missing
if (!pathinfo($filename, PATHINFO_EXTENSION) && ($extensions = rcube_mime::get_mime_extensions($mimetype))) {
$filename .= '.' . $extensions[0];
}
header("Content-Disposition: $disposition; filename=\"$filename\"");
// handle tiff to jpeg conversion
if (!empty($tiff2jpeg)) {
$temp_dir = unslashify($RCMAIL->config->get('temp_dir'));
$file_path = tempnam($temp_dir, 'rcmAttmnt');
// write content to temp file
if ($part->body) {
$saved = file_put_contents($file_path, $part->body);
}
else if ($part->size) {
$fd = fopen($file_path, 'w');
$saved = $RCMAIL->storage->get_message_part($MESSAGE->uid, $part->mime_id, $part, false, $fd);
fclose($fd);
}
// convert image to jpeg and send it to the browser
if ($saved) {
$image = new rcube_image($file_path);
if ($image->convert(rcube_image::TYPE_JPG, $file_path)) {
header("Content-Length: " . filesize($file_path));
readfile($file_path);
}
unlink($file_path);
}
}
// do content filtering to avoid XSS through fake images
else if (!empty($_REQUEST['_embed']) && $browser->ie && $browser->ver <= 8) {
if ($part->body) {
echo preg_match('/<(script|iframe|object)/i', $part->body) ? '' : $part->body;
$sent = true;
}
else if ($part->size) {
$stdout = fopen('php://output', 'w');
stream_filter_register('rcube_content', 'rcube_content_filter') or die('Failed to register content filter');
stream_filter_append($stdout, 'rcube_content');
$sent = $RCMAIL->storage->get_message_part($MESSAGE->uid, $part->mime_id, $part, false, $stdout);
}
}
// send part as-it-is
else {
if ($part->body) {
header("Content-Length: " . strlen($part->body));
echo $part->body;
$sent = true;
}
else if ($part->size) {
if ($size = (int)$part->d_parameters['size']) {
header("Content-Length: $size");
}
$sent = $RCMAIL->storage->get_message_part($MESSAGE->uid, $part->mime_id, $part, true);
}
}
// check connection status
if ($part->size && !$sent) {
check_storage_status();
}
}
exit;
}
}
// print message
else {
// send correct headers for content type
header("Content-Type: text/html");
$cont = "<html>\n<head><title></title>\n</head>\n<body>";
$cont .= rcmail_message_body(array());
$cont .= "\n</body>\n</html>";
$OUTPUT = new rcube_html_page();
$OUTPUT->write($cont);
exit;
}
// if we arrive here, the requested part was not found
header('HTTP/1.1 404 Not Found');
exit;
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 simultanously.
// 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 {
raise_error(array(
'code' => 500, 'type' => 'php',
'file' => __FILE__, 'line' => __LINE__,
'message' => 'Unable to get/display message part. IMAP connection error'),
true, true);
}
// Don't kill session, just quit (#1486995)
exit;
}
}
|