githubFork/roundcubemail.git

Aleksander Machniak

2016-01-18 22a018d082ba7ce4f88a44bb473180b5dd58277a

commit \| author \| age
4e17e6	1	<?php
T	2
a95874	3	/**
4e17e6	4	+-----------------------------------------------------------------------+
T	5	\| program/steps/mail/get.inc \|
	6	\| \|
e019f2	7	\| This file is part of the Roundcube Webmail client \|
c97625	8	\| Copyright (C) 2005-2013, The Roundcube Dev Team \|
7fe381	9	\| \|
T	10	\| Licensed under the GNU General Public License version 3 or \|
	11	\| any later version with exceptions for skins & plugins. \|
	12	\| See the README file for a full license statement. \|
4e17e6	13	\| \|
T	14	\| PURPOSE: \|
	15	\| Delivering a specific part of a mail message \|
	16	\| \|
	17	+-----------------------------------------------------------------------+
	18	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	19	+-----------------------------------------------------------------------+
	20	*/
	21
	22
	23	// show loading page
8fa58e	24	if (!empty($_GET['_preload'])) {
b1d13e	25	$_get = $_GET + array('_mimewarning' => 1, '_embed' => 1);
TB	26	unset($_get['_preload']);
	27	$url = $RCMAIL->url($_get);
c97625	28	$message = $RCMAIL->gettext('loadingdata');
4e17e6	29
c97625	30	header('Content-Type: text/html; charset=' . RCUBE_CHARSET);
AM	31	print "<html>\n<head>\n"
6b2b2e	32	. '<meta http-equiv="refresh" content="0; url='.rcube::Q($url).'">' . "\n"
AM	33	. '<meta http-equiv="content-type" content="text/html; charset='.RCUBE_CHARSET.'">' . "\n"
3e8b11	34	. "</head>\n<body>\n$message\n</body>\n</html>";
c97625	35	exit;
8fa58e	36	}
4e17e6	37
d51c93	38	ob_end_clean();
4e17e6	39
T	40	// similar code as in program/steps/mail/show.inc
8fa58e	41	if (!empty($_GET['_uid'])) {
c97625	42	$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GET);
AM	43	$RCMAIL->config->set('prefer_html', true);
63e793	44	$MESSAGE = new rcube_message($uid, null, intval($_GET['_safe']));
8fa58e	45	}
4bfe4e	46
AM	47	// check connection status
	48	check_storage_status();
4e17e6	49
6b2b2e	50	$part_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC);
eaf383	51
4e17e6	52	// show part page
8fa58e	53	if (!empty($_GET['_frame'])) {
c97625	54	if ($part_id && ($part = $MESSAGE->mime_parts[$part_id])) {
AM	55	$filename = rcmail_attachment_name($part);
	56	$OUTPUT->set_pagetitle($filename);
	57	}
b6da0b	58
c97625	59	// register UI objects
AM	60	$OUTPUT->add_handlers(array(
	61	'messagepartframe' => 'rcmail_message_part_frame',
	62	'messagepartcontrols' => 'rcmail_message_part_controls',
	63	));
eaf383	64
c97625	65	$OUTPUT->set_env('mailbox', $RCMAIL->storage->get_folder());
AM	66	$OUTPUT->set_env('uid', $uid);
	67	$OUTPUT->set_env('part', $part_id);
	68	$OUTPUT->set_env('filename', $filename);
049428	69
c97625	70	$OUTPUT->send('messagepart');
AM	71	exit;
8fa58e	72	}
4e17e6	73
031491	74	// render thumbnail of an image attachment
TB	75	else if ($_GET['_thumb']) {
c97625	76	$pid = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GET);
AM	77	if ($part = $MESSAGE->mime_parts[$pid]) {
	78	$thumbnail_size = $RCMAIL->config->get('image_thumbnail_size', 240);
	79	$temp_dir = $RCMAIL->config->get('temp_dir');
	80	$mimetype = $part->mimetype;
	81	$file_ident = $MESSAGE->headers->messageID . ':' . $part->mime_id . ':' . $part->size . ':' . $part->mimetype;
	82	$cache_basename = $temp_dir . '/' . md5($file_ident . ':' . $RCMAIL->user->ID . ':' . $thumbnail_size);
03aa84	83	$cache_file = $cache_basename . '.thumb';
031491	84
c97625	85	// render thumbnail image if not done yet
AM	86	if (!is_file($cache_file)) {
03aa84	87	if ($fp = fopen(($orig_name = $cache_basename . '.tmp'), 'w')) {
7ff227	88	$MESSAGE->get_part_body($part->mime_id, false, 0, $fp);
c97625	89	fclose($fp);
031491	90
c97625	91	$image = new rcube_image($orig_name);
AM	92	if ($imgtype = $image->resize($thumbnail_size, $cache_file, true)) {
	93	$mimetype = 'image/' . $imgtype;
	94	unlink($orig_name);
	95	}
40d734	96	else if (stripos($mimetype, 'image/svg') === 0) {
AM	97	$content = rcmail_svg_filter(file_get_contents($orig_name));
	98	file_put_contents($cache_file, $content);
	99	unlink($orig_name);
	100	}
c97625	101	else {
AM	102	rename($orig_name, $cache_file);
	103	}
	104	}
19cc5b	105	}
AM	106
c97625	107	if (is_file($cache_file)) {
AM	108	header('Content-Type: ' . $mimetype);
	109	readfile($cache_file);
19cc5b	110	}
8fa58e	111	}
8d4bcd	112
4e17e6	113	exit;
8fa58e	114	}
c97625	115	else if (strlen($part_id)) {
AM	116	if ($part = $MESSAGE->mime_parts[$part_id]) {
	117	$mimetype = rcmail_fix_mimetype($part->mimetype);
	118
	119	// allow post-processing of the message body
	120	$plugin = $RCMAIL->plugins->exec_hook('message_part_get', array(
	121	'uid' => $MESSAGE->uid,
	122	'id' => $part->mime_id,
	123	'mimetype' => $mimetype,
	124	'part' => $part,
	125	'download' => !empty($_GET['_download'])
	126	));
	127
	128	if ($plugin['abort']) {
	129	exit;
	130	}
	131
	132	// overwrite modified vars from plugin
	133	$mimetype = $plugin['mimetype'];
	134	$extensions = rcube_mime::get_mime_extensions($mimetype);
	135
	136	if ($plugin['body']) {
48ba44	137	$body = $plugin['body'];
c97625	138	}
AM	139
	140	// compare file mimetype with the stated content-type headers and file extension to avoid malicious operations
	141	if (!empty($_REQUEST['_embed']) && empty($_REQUEST['_nocheck'])) {
	142	$file_extension = strtolower(pathinfo($part->filename, PATHINFO_EXTENSION));
	143
	144	// 1. compare filename suffix with expected suffix derived from mimetype
4a2a62	145	$valid = $file_extension && in_array($file_extension, (array)$extensions) \|\| empty($extensions) \|\| !empty($_REQUEST['_mimeclass']);
c97625	146
AM	147	// 2. detect the real mimetype of the attachment part and compare it with the stated mimetype and filename extension
	148	if ($valid \|\| !$file_extension \|\| $mimetype == 'application/octet-stream' \|\| stripos($mimetype, 'text/') === 0) {
48ba44	149	$tmp_body = $body ?: $MESSAGE->get_part_body($part->mime_id, false, 2048);
c97625	150
AM	151	// detect message part mimetype
48ba44	152	$real_mimetype = rcube_mime::file_content_type($tmp_body, $part->filename, $mimetype, true, true);
c97625	153	list($real_ctype_primary, $real_ctype_secondary) = explode('/', $real_mimetype);
AM	154
	155	// accept text/plain with any extension
	156	if ($real_mimetype == 'text/plain' && $real_mimetype == $mimetype) {
	157	$valid_extension = true;
	158	}
556d28	159	// ignore differences in text/* mimetypes. Filetype detection isn't very reliable here
AM	160	else if ($real_ctype_primary == 'text' && strpos($mimetype, $real_ctype_primary) === 0) {
	161	$real_mimetype = $mimetype;
	162	$valid_extension = true;
	163	}
	164	// ignore filename extension if mimeclass matches (#1489029)
	165	else if (!empty($_REQUEST['_mimeclass']) && $real_ctype_primary == $_REQUEST['_mimeclass']) {
	166	$valid_extension = true;
	167	}
	168	else {
	169	// get valid file extensions
	170	$extensions = rcube_mime::get_mime_extensions($real_mimetype);
45256e	171	$valid_extension = !$file_extension \|\| empty($extensions) \|\| in_array($file_extension, (array)$extensions);
556d28	172	}
c97625	173
AM	174	// fix mimetype for images wrongly declared as octet-stream
	175	if ($mimetype == 'application/octet-stream' && strpos($real_mimetype, 'image/') === 0 && $valid_extension) {
	176	$mimetype = $real_mimetype;
	177	}
	178
4a2a62	179	// "fix" real mimetype the same way the original is before comparison
AM	180	$real_mimetype = rcmail_fix_mimetype($real_mimetype);
	181
	182	$valid = $real_mimetype == $mimetype && $valid_extension;
c97625	183	}
AM	184	else {
	185	$real_mimetype = $mimetype;
	186	}
	187
	188	// show warning if validity checks failed
	189	if (!$valid) {
	190	// send blocked.gif for expected images
	191	if (empty($_REQUEST['_mimewarning']) && strpos($mimetype, 'image/') === 0) {
	192	// Do not cache. Failure might be the result of a misconfiguration, thus real content should be returned once fixed.
c6efcf	193	$content = $RCMAIL->get_resource_content('blocked.gif');
c97625	194	$OUTPUT->nocacheing_headers();
AM	195	header("Content-Type: image/gif");
	196	header("Content-Transfer-Encoding: binary");
c6efcf	197	header("Content-Length: " . strlen($content));
AM	198	echo $content;
c97625	199	}
AM	200	else { // html warning with a button to load the file anyway
	201	$OUTPUT = new rcmail_html_page();
	202	$OUTPUT->write(html::tag('html', null, html::tag('body', 'embed',
	203	html::div(array('class' => 'rcmail-inline-message rcmail-inline-warning'),
	204	$RCMAIL->gettext(array(
	205	'name' => 'attachmentvalidationerror',
	206	'vars' => array(
	207	'expected' => $mimetype . ($file_extension ? " (.$file_extension)" : ''),
	208	'detected' => $real_mimetype . ($extensions[0] ? " (.$extensions[0])" : ''),
	209	)
	210	))
	211	. html::p(array('class' => 'rcmail-inline-buttons'),
	212	html::tag('button', array(
	213	'onclick' => "location.href='" . $RCMAIL->url(array_merge($_GET, array('_nocheck' => 1))) . "'"
	214	),
	215	$RCMAIL->gettext('showanyway'))
	216	)
	217	))));
	218	}
	219
	220	exit;
	221	}
	222	}
	223
	224
	225	// TIFF to JPEG conversion, if needed
	226	$tiff_support = !empty($_SESSION['browser_caps']) && !empty($_SESSION['browser_caps']['tif']);
	227	if (!empty($_REQUEST['_embed']) && !$tiff_support
8968f9	228	&& rcube_image::is_convertable('image/tiff')
c97625	229	&& rcmail_part_image_type($part) == 'image/tiff'
AM	230	) {
	231	$tiff2jpeg = true;
	232	$mimetype = 'image/jpeg';
	233	}
	234
	235
	236	$browser = $RCMAIL->output->browser;
	237	list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
	238
	239	if (!$plugin['download'] && $ctype_primary == 'text') {
827159	240	header("Content-Type: text/$ctype_secondary; charset=" . ($part->charset ?: RCUBE_CHARSET));
c97625	241	}
AM	242	else {
	243	header("Content-Type: $mimetype");
	244	header("Content-Transfer-Encoding: binary");
	245	}
	246
	247	// deliver part content
	248	if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($plugin['download'])) {
	249	// Check if we have enough memory to handle the message in it
	250	// #1487424: we need up to 10x more memory than the body
	251	if (!rcube_utils::mem_check($part->size * 10)) {
	252	$out = '<body>' . $RCMAIL->gettext('messagetoobig'). ' '
	253	. html::a('?_task=mail&_action=get&_download=1&_uid='.$MESSAGE->uid.'&_part='.$part->mime_id
c83940	254	.'&_mbox='. urlencode($MESSAGE->folder), $RCMAIL->gettext('download')) . '</body></html>';
c97625	255	}
AM	256	else {
	257	// get part body if not available
48ba44	258	if (!isset($body)) {
AM	259	$body = $MESSAGE->get_part_body($part->mime_id, true);
c97625	260	}
AM	261
	262	// show images?
	263	rcmail_check_safe($MESSAGE);
	264
	265	// render HTML body
48ba44	266	$out = rcmail_print_body($body, $part, array('safe' => $MESSAGE->is_safe, 'inline_html' => false));
c97625	267
AM	268	// insert remote objects warning into HTML body
	269	if ($REMOTE_OBJECTS) {
	270	$body_start = 0;
	271	if ($body_pos = strpos($out, '<body')) {
	272	$body_start = strpos($out, '>', $body_pos) + 1;
	273	}
	274
	275	$out = substr($out, 0, $body_start)
	276	. html::div(array('class' => 'rcmail-inline-message rcmail-inline-warning'),
	277	rcube::Q($RCMAIL->gettext('blockedimages')) . ' ' .
	278	html::tag('button',
	279	array('onclick' => "location.href='" . $RCMAIL->url(array_merge($_GET, array('_safe' => 1))) . "'"),
	280	rcube::Q($RCMAIL->gettext('showimages')))
	281	)
	282	. substr($out, $body_start);
	283	}
	284	}
	285
	286	// check connection status
48ba44	287	if ($part->size && empty($body)) {
c97625	288	check_storage_status();
AM	289	}
	290
	291	$OUTPUT = new rcmail_html_page();
	292	$OUTPUT->write($out);
	293	}
	294	else {
	295	// don't kill the connection if download takes more than 30 sec.
	296	@set_time_limit(0);
	297
	298	$filename = rcmail_attachment_name($part);
	299
5515db	300	if ($browser->ie)
c97625	301	$filename = rawurlencode($filename);
AM	302	else
	303	$filename = addcslashes($filename, '"');
	304
	305	$disposition = !empty($plugin['download']) ? 'attachment' : 'inline';
	306
	307	// Workaround for nasty IE bug (#1488844)
	308	// If Content-Disposition header contains string "attachment" e.g. in filename
	309	// IE handles data as attachment not inline
	310	if ($disposition == 'inline' && $browser->ie && $browser->ver < 9) {
	311	$filename = str_ireplace('attachment', 'attach', $filename);
	312	}
	313
	314	// add filename extension if missing
	315	if (!pathinfo($filename, PATHINFO_EXTENSION) && ($extensions = rcube_mime::get_mime_extensions($mimetype))) {
	316	$filename .= '.' . $extensions[0];
	317	}
	318
	319	header("Content-Disposition: $disposition; filename=\"$filename\"");
	320
	321	// handle tiff to jpeg conversion
	322	if (!empty($tiff2jpeg)) {
	323	$temp_dir = unslashify($RCMAIL->config->get('temp_dir'));
	324	$file_path = tempnam($temp_dir, 'rcmAttmnt');
	325
	326	// write content to temp file
48ba44	327	if ($body) {
AM	328	$saved = file_put_contents($file_path, $body);
c97625	329	}
AM	330	else if ($part->size) {
	331	$fd = fopen($file_path, 'w');
48ba44	332	$saved = $MESSAGE->get_part_body($part->mime_id, false, 0, $fd);
c97625	333	fclose($fd);
AM	334	}
	335
	336	// convert image to jpeg and send it to the browser
40d734	337	if ($sent = $saved) {
c97625	338	$image = new rcube_image($file_path);
AM	339	if ($image->convert(rcube_image::TYPE_JPG, $file_path)) {
	340	header("Content-Length: " . filesize($file_path));
	341	readfile($file_path);
	342	}
	343	unlink($file_path);
	344	}
	345	}
	346	else {
40d734	347	$sent = rcmail_message_part_output($body, $part, $mimetype, $plugin['download']);
c97625	348	}
AM	349
	350	// check connection status
	351	if ($part->size && !$sent) {
	352	check_storage_status();
	353	}
	354	}
	355
	356	exit;
	357	}
	358	}
4e17e6	359	// print message
8fa58e	360	else {
c97625	361	// send correct headers for content type
AM	362	header("Content-Type: text/html");
4e17e6	363
c97625	364	$cont = "<html>\n<head><title></title>\n</head>\n<body>";
AM	365	$cont .= rcmail_message_body(array());
	366	$cont .= "\n</body>\n</html>";
4e17e6	367
c97625	368	$OUTPUT = new rcmail_html_page();
AM	369	$OUTPUT->write($cont);
4e17e6	370
c97625	371	exit;
8fa58e	372	}
4e17e6	373
T	374
	375	// if we arrive here, the requested part was not found
	376	header('HTTP/1.1 404 Not Found');
	377	exit;
	378
eaf383	379	/**
AM	380	* Handles nicely storage connection errors
	381	*/
4bfe4e	382	function check_storage_status()
AM	383	{
	384	$error = rcmail::get_instance()->storage->get_error_code();
	385
	386	// Check if we have a connection error
	387	if ($error == rcube_imap_generic::ERROR_BAD) {
	388	ob_end_clean();
	389
	390	// Get action is often executed simultanously.
	391	// Some servers have MAXPERIP or other limits.
	392	// To workaround this we'll wait for some time
	393	// and try again (once).
	394	// Note: Random sleep interval is used to minimize concurency
	395	// in getting message parts
	396
	397	if (!isset($_GET['_redirected'])) {
	398	usleep(rand(10,30)*100000); // 1-3 sec.
	399	header('Location: ' . $_SERVER['REQUEST_URI'] . '&_redirected=1');
	400	}
	401	else {
6b2b2e	402	rcube::raise_error(array(
4bfe4e	403	'code' => 500, 'type' => 'php',
AM	404	'file' => __FILE__, 'line' => __LINE__,
	405	'message' => 'Unable to get/display message part. IMAP connection error'),
	406	true, true);
	407	}
	408
	409	// Don't kill session, just quit (#1486995)
	410	exit;
	411	}
	412	}
049428	413
eaf383	414	/**
AM	415	* Attachment properties table
	416	*/
049428	417	function rcmail_message_part_controls($attrib)
AM	418	{
	419	global $MESSAGE, $RCMAIL;
	420
6b2b2e	421	$part = asciiwords(rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC));
049428	422	if (!is_object($MESSAGE) \|\| !is_array($MESSAGE->parts)
AM	423	\|\| !($_GET['_uid'] && $_GET['_part']) \|\| !$MESSAGE->mime_parts[$part]
	424	) {
	425	return '';
	426	}
	427
	428	$part = $MESSAGE->mime_parts[$part];
	429	$table = new html_table(array('cols' => 2));
	430
6b2b2e	431	$table->add('title', rcube::Q($RCMAIL->gettext('namex')).':');
AM	432	$table->add('header', rcube::Q(rcmail_attachment_name($part)));
049428	433
6b2b2e	434	$table->add('title', rcube::Q($RCMAIL->gettext('type')).':');
AM	435	$table->add('header', rcube::Q($part->mimetype));
049428	436
6b2b2e	437	$table->add('title', rcube::Q($RCMAIL->gettext('size')).':');
AM	438	$table->add('header', rcube::Q($RCMAIL->message_part_size($part)));
049428	439
AM	440	return $table->show($attrib);
	441	}
	442
eaf383	443	/**
AM	444	* Attachment preview frame
	445	*/
049428	446	function rcmail_message_part_frame($attrib)
AM	447	{
	448	global $MESSAGE, $RCMAIL;
	449
6b2b2e	450	$part = $MESSAGE->mime_parts[asciiwords(rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC))];
049428	451	$ctype_primary = strtolower($part->ctype_primary);
AM	452
	453	$attrib['src'] = './?' . str_replace('_frame=', ($ctype_primary=='text' ? '_embed=' : '_preload='), $_SERVER['QUERY_STRING']);
	454
	455	$RCMAIL->output->add_gui_object('messagepartframe', $attrib['id']);
	456
	457	return html::iframe($attrib);
	458	}
40d734	459
AM	460	/**
	461	* Output attachment body with content filtering
	462	*/
	463	function rcmail_message_part_output($body, $part, $mimetype, $download)
	464	{
	465	global $MESSAGE, $RCMAIL;
	466
	467	if (!$part->size && !$body) {
	468	return false;
	469	}
	470
	471	$browser = $RCMAIL->output->browser;
	472	$secure = stripos($mimetype, 'image/') === false \|\| $download;
	473
	474	// Remove <script> in SVG images
	475	if (!$secure && stripos($mimetype, 'image/svg') === 0) {
	476	if (!$body) {
	477	$body = $MESSAGE->get_part_body($part->mime_id, false);
	478	if (empty($body)) {
	479	return false;
	480	}
	481	}
	482
	483	echo rcmail_svg_filter($body);
	484	return true;
	485	}
	486
	487	// Remove dangerous content in images for older IE (to be removed)
	488	if (!$secure && $browser->ie && $browser->ver <= 8) {
	489	if ($body) {
	490	echo preg_match('/<(script\|iframe\|object)/i', $body) ? '' : $body;
	491	return true;
	492	}
	493	else {
	494	$stdout = fopen('php://output', 'w');
	495	stream_filter_register('rcube_content', 'rcube_content_filter') or die('Failed to register content filter');
	496	stream_filter_append($stdout, 'rcube_content');
	497	return $MESSAGE->get_part_body($part->mime_id, true, 0, $stdout);
	498	}
	499	}
	500
	501	if ($body && !$download) {
	502	header("Content-Length: " . strlen($body));
	503	echo $body;
	504	return true;
	505	}
	506
	507	// Don't be tempted to set Content-Length to $part->d_parameters['size'] (#1490482)
	508	// RFC2183 says "The size parameter indicates an approximate size"
	509
	510	return $MESSAGE->get_part_body($part->mime_id, false, 0, -1);
	511	}
	512
	513	/**
	514	* Remove <script> in SVG images
	515	*/
	516	function rcmail_svg_filter($body)
	517	{
a1fdb2	518	// clean SVG with washhtml
AM	519	$wash_opts = array(
	520	'show_washed' => false,
	521	'allow_remote' => false,
	522	'charset' => RCUBE_CHARSET,
	523	'html_elements' => array('title'),
	524	// 'blocked_src' => 'program/resources/blocked.gif',
	525	);
40d734	526
a1fdb2	527	// initialize HTML washer
AM	528	$washer = new rcube_washtml($wash_opts);
40d734	529
a1fdb2	530	// allow CSS styles, will be sanitized by rcmail_washtml_callback()
AM	531	$washer->add_callback('style', 'rcmail_washtml_callback');
	532
	533	return $washer->wash($body);
40d734	534	}