1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
|
<?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_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);
$cache_basename = $temp_dir . '/' . md5($MESSAGE->headers->messageID . $part->mime_id . ':' . $RCMAIL->user->ID . ':' . $thumbnail_size);
$cache_file = $cache_basename . '.' . $ext;
$mimetype = $part->mimetype;
// render thumbnail image if not done yet
if (!is_file($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]) {
$ctype_primary = strtolower($part->ctype_primary);
$ctype_secondary = strtolower($part->ctype_secondary);
$mimetype = sprintf('%s/%s', $ctype_primary, $ctype_secondary);
// 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)$extensions);
// 2. detect the real mimetype of the attachment part and compare it with the stated mimetype and filename extension
if ($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));
// 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) {
$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 {
$mimetype = rcmail_fix_mimetype($mimetype);
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;
}
}
|
