attary may be empty at this point and the sq_fixatts call will generate PHP
[squirrelmail.git] / functions / mime.php
1 <?php
2
3 /**
4 * mime.php
5 *
6 * This contains the functions necessary to detect and decode MIME
7 * messages.
8 *
9 * @copyright 1999-2011 The SquirrelMail Project Team
10 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
11 * @version $Id$
12 * @package squirrelmail
13 */
14
15 /**
16 * dependency information
17 functions dependency
18 mime_structure
19 class/mime/Message.class.php
20 Message::parseStructure
21 functions/page_header.php
22 displayPageHeader
23 functions/display_messages.php
24 plain_error_message
25 mime_fetch_body
26 functions/imap_general.php
27 sqimap_run_command
28 mime_print_body_lines
29
30
31
32 functions/imap.php
33 functions/attachment_common.php
34 functions/display_messages.php
35
36 magicHtml => url_parser
37 translateText => url_parser
38
39 */
40
41
42 /* -------------------------------------------------------------------------- */
43 /* MIME DECODING */
44 /* -------------------------------------------------------------------------- */
45
46 /**
47 * Get the MIME structure
48 *
49 * This function gets the structure of a message and stores it in the "message" class.
50 * It will return this object for use with all relevant header information and
51 * fully parsed into the standard "message" object format.
52 */
53 function mime_structure ($bodystructure, $flags=array()) {
54
55 /* Isolate the body structure and remove beginning and end parenthesis. */
56 $read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') + 13));
57 $read = trim(substr ($read, 0, -1));
58 $i = 0;
59 $msg = Message::parseStructure($read,$i);
60
61 if (!is_object($msg)) {
62 global $color, $mailbox;
63 displayPageHeader( $color, $mailbox );
64 $errormessage = _("SquirrelMail could not decode the bodystructure of the message");
65 $errormessage .= '<br />'._("The bodystructure provided by your IMAP server:").'<br /><br />';
66 $errormessage .= '<pre>' . htmlspecialchars($read) . '</pre>';
67 plain_error_message( $errormessage );
68 echo '</body></html>';
69 exit;
70 }
71 if (count($flags)) {
72 foreach ($flags as $flag) {
73 //FIXME: please document why it is we have to check the first char of the flag but we then go ahead and do a full string comparison anyway. Is this a speed enhancement? If not, let's keep it simple and just compare the full string and forget the switch block.
74 $char = strtoupper($flag{1});
75 switch ($char) {
76 case 'S':
77 if (strtolower($flag) == '\\seen') {
78 $msg->is_seen = true;
79 }
80 break;
81 case 'A':
82 if (strtolower($flag) == '\\answered') {
83 $msg->is_answered = true;
84 }
85 break;
86 case 'D':
87 if (strtolower($flag) == '\\deleted') {
88 $msg->is_deleted = true;
89 }
90 break;
91 case 'F':
92 if (strtolower($flag) == '\\flagged') {
93 $msg->is_flagged = true;
94 }
95 else if (strtolower($flag) == '$forwarded') {
96 $msg->is_forwarded = true;
97 }
98 break;
99 case 'M':
100 if (strtolower($flag) == '$mdnsent') {
101 $msg->is_mdnsent = true;
102 }
103 break;
104 default:
105 break;
106 }
107 }
108 }
109 // listEntities($msg);
110 return $msg;
111 }
112
113
114
115 /* This starts the parsing of a particular structure. It is called recursively,
116 * so it can be passed different structures. It returns an object of type
117 * $message.
118 * First, it checks to see if it is a multipart message. If it is, then it
119 * handles that as it sees is necessary. If it is just a regular entity,
120 * then it parses it and adds the necessary header information (by calling out
121 * to mime_get_elements()
122 */
123
124 function mime_fetch_body($imap_stream, $id, $ent_id=1, $fetch_size=0) {
125 /* Do a bit of error correction. If we couldn't find the entity id, just guess
126 * that it is the first one. That is usually the case anyway.
127 */
128
129 if (!$ent_id) {
130 $cmd = "FETCH $id BODY[]";
131 } else {
132 $cmd = "FETCH $id BODY[$ent_id]";
133 }
134
135 if ($fetch_size!=0) $cmd .= "<0.$fetch_size>";
136
137 $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, TRUE);
138 do {
139 $topline = trim(array_shift($data));
140 } while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH.*/i', $topline)) ;
141
142 $wholemessage = implode('', $data);
143 if (preg_match('/\{([^\}]*)\}/', $topline, $regs)) {
144 $ret = substr($wholemessage, 0, $regs[1]);
145 /* There is some information in the content info header that could be important
146 * in order to parse html messages. Let's get them here.
147 */
148 // if ($ret{0} == '<') {
149 // $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, TRUE);
150 // }
151 } else if (preg_match('/"([^"]*)"/', $topline, $regs)) {
152 $ret = $regs[1];
153 } else if ((stristr($topline, 'nil') !== false) && (empty($wholemessage))) {
154 $ret = $wholemessage;
155 } else {
156 global $where, $what, $mailbox, $passed_id, $startMessage;
157 $par = 'mailbox=' . urlencode($mailbox) . '&amp;passed_id=' . $passed_id;
158 if (isset($where) && isset($what)) {
159 $par .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
160 } else {
161 $par .= '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
162 }
163 $par .= '&amp;response=' . urlencode($response) .
164 '&amp;message=' . urlencode($message) .
165 '&amp;topline=' . urlencode($topline);
166
167 echo '<tt><br />' .
168 '<table width="80%"><tr>' .
169 '<tr><td colspan="2">' .
170 _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
171 '</td></tr>' .
172 '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
173 '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
174 '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
175 '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
176 "</table><br /></tt></font><hr />";
177
178 $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, TRUE);
179 array_shift($data);
180 $wholemessage = implode('', $data);
181
182 $ret = $wholemessage;
183 }
184 return $ret;
185 }
186
187 function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding, $rStream='php://stdout', $force_crlf='') {
188
189 /* Don't kill the connection if the browser is over a dialup
190 * and it would take over 30 seconds to download it.
191 * Don't call set_time_limit in safe mode.
192 */
193
194 if (!ini_get('safe_mode')) {
195 set_time_limit(0);
196 }
197 /* in case of base64 encoded attachments, do not buffer them.
198 Instead, echo the decoded attachment directly to screen */
199 if (strtolower($encoding) == 'base64') {
200 if (!$ent_id) {
201 $query = "FETCH $id BODY[]";
202 } else {
203 $query = "FETCH $id BODY[$ent_id]";
204 }
205 sqimap_run_command($imap_stream,$query,true,$response,$message,TRUE,'sqimap_base64_decode',$rStream,true);
206 } else {
207 $body = mime_fetch_body ($imap_stream, $id, $ent_id);
208 if (is_resource($rStream)) {
209 fputs($rStream,decodeBody($body, $encoding, $force_crlf));
210 } else {
211 echo decodeBody($body, $encoding, $force_crlf);
212 }
213 }
214
215 /*
216 TODO, use the same method for quoted printable.
217 However, I assume that quoted printable attachments aren't that large
218 so the performancegain / memory usage drop will be minimal.
219 If we decide to add that then we need to adapt sqimap_fread because
220 we need to split te result on \n and fread doesn't stop at \n. That
221 means we also should provide $results from sqimap_fread (by ref) to
222 te function and set $no_return to false. The $filter function for
223 quoted printable should handle unsetting of $results.
224 */
225 /*
226 TODO 2: find out how we write to the output stream php://stdout. fwrite
227 doesn't work because 'php://stdout isn't a stream.
228 */
229
230 return;
231 }
232
233 /* -[ END MIME DECODING ]----------------------------------------------------------- */
234
235 /* This is here for debugging purposes. It will print out a list
236 * of all the entity IDs that are in the $message object.
237 */
238 function listEntities ($message) {
239 if ($message) {
240 echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br />';
241 for ($i = 0; isset($message->entities[$i]); $i++) {
242 echo "$i : ";
243 $msg = listEntities($message->entities[$i]);
244
245 if ($msg) {
246 echo "return: ";
247 return $msg;
248 }
249 }
250 }
251 }
252
253 function getPriorityStr($priority) {
254 $priority_level = substr($priority,0,1);
255
256 switch($priority_level) {
257 /* Check for a higher then normal priority. */
258 case '1':
259 case '2':
260 $priority_string = _("High");
261 break;
262
263 /* Check for a lower then normal priority. */
264 case '4':
265 case '5':
266 $priority_string = _("Low");
267 break;
268
269 /* Check for a normal priority. */
270 case '3':
271 default:
272 $priority_level = '3';
273 $priority_string = _("Normal");
274 break;
275
276 }
277 return $priority_string;
278 }
279
280 /* returns a $message object for a particular entity id */
281 function getEntity ($message, $ent_id) {
282 return $message->getEntity($ent_id);
283 }
284
285 /* translateText
286 * Extracted from strings.php 23/03/2002
287 */
288
289 function translateText(&$body, $wrap_at, $charset) {
290 global $where, $what; /* from searching */
291 global $color; /* color theme */
292
293 // require_once(SM_PATH . 'functions/url_parser.php');
294
295 $body_ary = explode("\n", $body);
296 for ($i=0; $i < count($body_ary); $i++) {
297 $line = rtrim($body_ary[$i],"\r");
298
299 if (strlen($line) - 2 >= $wrap_at) {
300 sqWordWrap($line, $wrap_at, $charset);
301 }
302 $line = charset_decode($charset, $line);
303 $line = str_replace("\t", ' ', $line);
304
305 parseUrl ($line);
306
307 $quotes = 0;
308 $pos = 0;
309 $j = strlen($line);
310
311 while ($pos < $j) {
312 if ($line[$pos] == ' ') {
313 $pos++;
314 } else if (strpos($line, '&gt;', $pos) === $pos) {
315 $pos += 4;
316 $quotes++;
317 } else {
318 break;
319 }
320 }
321
322 if ($quotes % 2) {
323 $line = '<span class="quote1">' . $line . '</span>';
324 } elseif ($quotes) {
325 $line = '<span class="quote2">' . $line . '</span>';
326 }
327
328 $body_ary[$i] = $line;
329 }
330 $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
331 }
332
333 /**
334 * This returns a parsed string called $body. That string can then
335 * be displayed as the actual message in the HTML. It contains
336 * everything needed, including HTML Tags, Attachments at the
337 * bottom, etc.
338 *
339 * Since 1.2.0 function uses message_body hook.
340 * Till 1.3.0 function included output of formatAttachments().
341 *
342 * @param resource $imap_stream imap connection resource
343 * @param object $message squirrelmail message object
344 * @param array $color squirrelmail color theme array
345 * @param integer $wrap_at number of characters per line
346 * @param string $ent_num (since 1.3.0) message part id
347 * @param integer $id (since 1.3.0) message id
348 * @param string $mailbox (since 1.3.0) imap folder name
349 * @return string html formated message text
350 */
351 function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX') {
352 /* This if statement checks for the entity to show as the
353 * primary message. To add more of them, just put them in the
354 * order that is their priority.
355 */
356 global $startMessage, $languages, $squirrelmail_language,
357 $show_html_default, $sort, $has_unsafe_images, $passed_ent_id,
358 $use_iframe, $iframe_height, $download_and_unsafe_link,
359 $download_href, $unsafe_image_toggle_href, $unsafe_image_toggle_text,
360 $oTemplate, $nbsp;
361
362 // workaround for not updated config.php
363 if (! isset($use_iframe)) $use_iframe = false;
364
365 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
366 // images off by default.
367 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
368
369 $body = '';
370 $urlmailbox = urlencode($mailbox);
371 $body_message = getEntity($message, $ent_num);
372 if (($body_message->header->type0 == 'text') ||
373 ($body_message->header->type0 == 'rfc822')) {
374 $body = mime_fetch_body ($imap_stream, $id, $ent_num);
375 $body = decodeBody($body, $body_message->header->encoding);
376
377 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
378 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode')) {
379 if (mb_detect_encoding($body) != 'ASCII') {
380 $body = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode',$body);
381 }
382 }
383
384 /* As of 1.5.2, $body is passed (and modified) by reference */
385 do_hook('message_body', $body);
386
387 /* If there are other types that shouldn't be formatted, add
388 * them here.
389 */
390
391 if ($body_message->header->type1 == 'html') {
392 if ($show_html_default <> 1) {
393 $entity_conv = array('&nbsp;' => ' ',
394 '<p>' => "\n",
395 '<P>' => "\n",
396 '<br>' => "\n",
397 '<BR>' => "\n",
398 '<br />' => "\n",
399 '<BR />' => "\n",
400 '&gt;' => '>',
401 '&lt;' => '<');
402 $body = strtr($body, $entity_conv);
403 $body = strip_tags($body);
404 $body = trim($body);
405 translateText($body, $wrap_at,
406 $body_message->header->getParameter('charset'));
407 } elseif ($use_iframe) {
408 /**
409 * If we don't add html message between iframe tags,
410 * we must detect unsafe images and modify $has_unsafe_images.
411 */
412 $html_body = magicHTML($body, $id, $message, $mailbox);
413 // Convert character set in order to display html mails in different character set
414 $html_body = charset_decode($body_message->header->getParameter('charset'),$html_body,false,true);
415
416 // creating iframe url
417 $iframeurl=sqm_baseuri().'src/view_html.php?'
418 . 'mailbox=' . $urlmailbox
419 . '&amp;passed_id=' . $id
420 . '&amp;ent_id=' . $ent_num
421 . '&amp;view_unsafe_images=' . (int) $view_unsafe_images;
422
423 global $oTemplate;
424 $oTemplate->assign('iframe_url', $iframeurl);
425 $oTemplate->assign('iframe_height', $iframe_height);
426 $oTemplate->assign('html_body', $html_body);
427
428 $body = $oTemplate->fetch('read_html_iframe.tpl');
429 } else {
430 // old way of html rendering
431 /**
432 * convert character set. charset_decode does not remove html special chars
433 * applied by magicHTML functions and does not sanitize them second time if
434 * fourth argument is true.
435 */
436 $charset = $body_message->header->getParameter('charset');
437 if (!empty($charset)) {
438 $body = charset_decode($charset,$body,false,true);
439 }
440 $body = magicHTML($body, $id, $message, $mailbox);
441 }
442 } else {
443 translateText($body, $wrap_at,
444 $body_message->header->getParameter('charset'));
445 }
446
447 /*
448 * Previously the links for downloading and unsafe images were printed
449 * under the mail. By putting the links in a global variable we can
450 * print it in the toolbar where it belongs. Since the original code was
451 * in this place it's left here. It might be possible to move it to some
452 * other place if that makes sense. The possibility to do so has not
453 * been evaluated yet.
454 */
455
456 // Initialize the global variable to an empty string.
457 // FIXME: To have $download_and_unsafe_link as a global variable might not be needed since the use of separate variables ($download_href, $unsafe_image_toggle_href, and $unsafe_image_toggle_text) for the templates was introduced.
458 $download_and_unsafe_link = '';
459
460 // Prepare and build a link for downloading the mail.
461 $link = 'passed_id=' . $id . '&amp;ent_id='.$ent_num.
462 '&amp;mailbox=' . $urlmailbox .'&amp;sort=' . $sort .
463 '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
464 if (isset($passed_ent_id)) {
465 $link .= '&amp;passed_ent_id='.$passed_ent_id;
466 }
467 $download_href = SM_PATH . 'src/download.php?absolute_dl=true&amp;' . $link;
468
469 // Always add the link for downloading the mail as a file to the global
470 // variable.
471 $download_and_unsafe_link .= "$nbsp|$nbsp"
472 . create_hyperlink($download_href, _("Download this as a file"));
473
474 // Find out the right text to use in the link depending on the
475 // circumstances. If the unsafe images are displayed the link should
476 // hide them, if they aren't displayed the link should only appear if
477 // the mail really contains unsafe images.
478 if ($view_unsafe_images) {
479 $text = _("Hide Unsafe Images");
480 } else {
481 if (isset($has_unsafe_images) && $has_unsafe_images) {
482 $link .= '&amp;view_unsafe_images=1';
483 $text = _("View Unsafe Images");
484 } else {
485 $text = '';
486 }
487 }
488
489 // Only create a link for unsafe images if there's need for one. If so:
490 // add it to the global variable.
491 if($text != '') {
492 $unsafe_image_toggle_href = SM_PATH . 'src/read_body.php?'.$link;
493 $unsafe_image_toggle_text = $text;
494 $download_and_unsafe_link .= "$nbsp|$nbsp"
495 . create_hyperlink($unsafe_image_toggle_href, $text);
496 }
497 }
498 return $body;
499 }
500
501 /**
502 * Generate attachments array for passing to templates.
503 *
504 * @since 1.5.2
505 * @param object $message SquirrelMail message object
506 * @param array $exclude_id message parts that are not attachments.
507 * @param string $mailbox mailbox name
508 * @param integer $id message id
509 */
510 function buildAttachmentArray($message, $exclude_id, $mailbox, $id) {
511 global $where, $what, $startMessage, $color, $passed_ent_id, $base_uri;
512
513 $att_ar = $message->getAttachments($exclude_id);
514 $urlMailbox = urlencode($mailbox);
515
516 $attachments = array();
517 foreach ($att_ar as $att) {
518 $ent = $att->entity_id;
519 $header = $att->header;
520 $type0 = strtolower($header->type0);
521 $type1 = strtolower($header->type1);
522 $name = '';
523 $links = array();
524 $links['download link']['text'] = _("Download");
525 $links['download link']['href'] = $base_uri .
526 "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
527
528 if ($type0 =='message' && $type1 == 'rfc822') {
529 $default_page = $base_uri . 'src/read_body.php';
530 $rfc822_header = $att->rfc822_header;
531 $filename = $rfc822_header->subject;
532 if (trim( $filename ) == '') {
533 $filename = 'untitled-[' . $ent . ']' ;
534 }
535 $from_o = $rfc822_header->from;
536 if (is_object($from_o)) {
537 $from_name = decodeHeader($from_o->getAddress(false));
538 } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
539 // something weird happens when a digest message is opened and you return to the digest
540 // now the from object is part of an array. Probably the parseHeader call overwrites the info
541 // retrieved from the bodystructure in a different way. We need to fix this later.
542 // possible starting point, do not fetch header we already have and inspect how
543 // the rfc822_header object behaves.
544 $from_name = decodeHeader($from_o[0]->getAddress(false));
545 } else {
546 $from_name = _("Unknown sender");
547 }
548 $description = _("From").': '.$from_name;
549 } else {
550 $default_page = $base_uri . 'src/download.php';
551 $filename = $att->getFilename();
552 if ($header->description) {
553 $description = decodeHeader($header->description);
554 } else {
555 $description = '';
556 }
557 }
558
559 $display_filename = $filename;
560 if (isset($passed_ent_id)) {
561 $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
562 } else {
563 $passed_ent_id_link = '';
564 }
565 $defaultlink = $default_page . "?startMessage=$startMessage"
566 . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
567 . '&amp;ent_id='.$ent.$passed_ent_id_link;
568 if ($where && $what) {
569 $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
570 }
571 // IE does make use of mime content sniffing. Forcing a download
572 // prohibit execution of XSS inside an application/octet-stream attachment
573 if ($type0 == 'application' && $type1 == 'octet-stream') {
574 $defaultlink .= '&amp;absolute_dl=true';
575 }
576
577 /* This executes the attachment hook with a specific MIME-type.
578 * It also allows plugins to run if there's a rule for a more
579 * generic type. Finally, a hook for ALL attachment types is
580 * run as well.
581 */
582 // First remember the default link.
583 $defaultlink_orig = $defaultlink;
584
585 /* The API for this hook has changed as of 1.5.2 so that all plugin
586 arguments are passed in an array instead of each their own plugin
587 argument, and arguments are passed by reference, so instead of
588 returning any changes, changes should simply be made to the original
589 arguments themselves. */
590 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
591 &$defaultlink, &$display_filename, &$where, &$what);
592 do_hook("attachment $type0/$type1", $temp);
593 /* The API for this hook has changed as of 1.5.2 so that all plugin
594 arguments are passed in an array instead of each their own plugin
595 argument, and arguments are passed by reference, so instead of
596 returning any changes, changes should simply be made to the original
597 arguments themselves. */
598 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
599 &$defaultlink, &$display_filename, &$where, &$what);
600 // Do not let a generic plugin change the default link if a more
601 // specialized one already did it...
602 if ($defaultlink != $defaultlink_orig) {
603 $dummy = '';
604 $temp[5] = &$dummy;
605 }
606 do_hook("attachment $type0/*", $temp);
607 /* The API for this hook has changed as of 1.5.2 so that all plugin
608 arguments are passed in an array instead of each their own plugin
609 argument, and arguments are passed by reference, so instead of
610 returning any changes, changes should simply be made to the original
611 arguments themselves. */
612 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
613 &$defaultlink, &$display_filename, &$where, &$what);
614 // Do not let a generic plugin change the default link if a more
615 // specialized one already did it...
616 if ($defaultlink != $defaultlink_orig) {
617 $dummy = '';
618 $temp[5] = &$dummy;
619 }
620 do_hook("attachment */*", $temp);
621
622 $this_attachment = array();
623 $this_attachment['Name'] = decodeHeader($display_filename);
624 $this_attachment['Description'] = $description;
625 $this_attachment['DefaultHREF'] = $defaultlink;
626 $this_attachment['DownloadHREF'] = $links['download link']['href'];
627 $this_attachment['ViewHREF'] = isset($links['attachment_common']) ? $links['attachment_common']['href'] : '';
628 $this_attachment['Size'] = $header->size;
629 $this_attachment['ContentType'] = htmlspecialchars($type0 .'/'. $type1);
630 $this_attachment['OtherLinks'] = array();
631 foreach ($links as $val) {
632 if ($val['text']==_("Download") || $val['text'] == _("View"))
633 continue;
634 if (empty($val['text']) && empty($val['extra']))
635 continue;
636
637 $temp = array();
638 $temp['HREF'] = $val['href'];
639 $temp['Text'] = (empty($val['text']) ? '' : $val['text']) . (empty($val['extra']) ? '' : $val['extra']);
640 $this_attachment['OtherLinks'][] = $temp;
641 }
642 $attachments[] = $this_attachment;
643
644 unset($links);
645 }
646
647 return $attachments;
648 }
649
650 /**
651 * Displays attachment links and information
652 *
653 * Since 1.3.0 function is not included in formatBody() call.
654 *
655 * Since 1.0.2 uses attachment $type0/$type1 hook.
656 * Since 1.2.5 uses attachment $type0/* hook.
657 * Since 1.5.0 uses attachments_bottom hook.
658 * Since 1.5.2 uses templates and does *not* return a value.
659 *
660 * @param object $message SquirrelMail message object
661 * @param array $exclude_id message parts that are not attachments.
662 * @param string $mailbox mailbox name
663 * @param integer $id message id
664 */
665 function formatAttachments($message, $exclude_id, $mailbox, $id) {
666 global $oTemplate;
667
668 $attach = buildAttachmentArray($message, $exclude_id, $mailbox, $id);
669
670 $oTemplate->assign('attachments', $attach);
671 $oTemplate->display('read_attachments.tpl');
672 }
673
674 function sqimap_base64_decode(&$string) {
675
676 // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
677 // fly decoding (to reduce memory usage) you have to check if the
678 // data has incomplete pairs
679
680 // Remove the noise in order to check if the 4 bytes pairs are complete
681 $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
682
683 $sStringRem = '';
684 $iMod = strlen($string) % 4;
685 if ($iMod) {
686 $sStringRem = substr($string,-$iMod);
687 // Check if $sStringRem contains padding characters
688 if (substr($sStringRem,-1) != '=') {
689 $string = substr($string,0,-$iMod);
690 } else {
691 $sStringRem = '';
692 }
693 }
694 $string = base64_decode($string);
695 return $sStringRem;
696 }
697
698 /**
699 * Decodes encoded string (usually message body)
700 *
701 * This function decodes a string (usually the message body)
702 * depending on the encoding type. Currently quoted-printable
703 * and base64 encodings are supported.
704 *
705 * The decode_body hook was added to this function in 1.4.2/1.5.0.
706 * The $force_crlf parameter was added in 1.5.2.
707 *
708 * @param string $string The encoded string
709 * @param string $encoding used encoding
710 * @param string $force_crlf Whether or not to force CRLF or LF
711 * line endings (or to leave as is).
712 * If given as "LF", line endings will
713 * all be converted to LF; if "CRLF",
714 * line endings will all be converted
715 * to CRLF. If given as an empty value,
716 * the global $force_crlf_default will
717 * be consulted (it can be specified in
718 * config/config_local.php). Otherwise,
719 * any other value will cause the string
720 * to be left alone. Note that this will
721 * be overridden to "LF" if not using at
722 * least PHP version 4.3.0. (OPTIONAL;
723 * default is empty - consult global
724 * default value)
725 *
726 * @return string The decoded string
727 *
728 * @since 1.0
729 *
730 */
731 function decodeBody($string, $encoding, $force_crlf='') {
732
733 global $force_crlf_default;
734 if (empty($force_crlf)) $force_crlf = $force_crlf_default;
735 $force_crlf = strtoupper($force_crlf);
736
737 // must force line endings to LF due to broken
738 // quoted_printable_decode() in PHP versions
739 // before 4.3.0 (see below)
740 //
741 if (!check_php_version(4, 3, 0) || $force_crlf == 'LF')
742 $string = str_replace("\r\n", "\n", $string);
743 else if ($force_crlf == 'CRLF')
744 $string = str_replace("\n", "\r\n", $string);
745
746 $encoding = strtolower($encoding);
747
748 $encoding_handler = do_hook('decode_body', $encoding);
749
750
751 // plugins get first shot at decoding the string
752 //
753 if (!empty($encoding_handler) && function_exists($encoding_handler)) {
754 $string = $encoding_handler('decode', $string);
755
756 } elseif ($encoding == 'quoted-printable' ||
757 $encoding == 'quoted_printable') {
758
759 // quoted_printable_decode() function is broken in older
760 // php versions. Text with \r\n decoding was fixed only
761 // in php 4.3.0. Minimal code requirement is PHP 4.0.4+
762 // and the above call to: str_replace("\r\n", "\n", $string);
763 //
764 $string = quoted_printable_decode($string);
765
766 } elseif ($encoding == 'base64') {
767 $string = base64_decode($string);
768 }
769
770 // All other encodings are returned raw.
771 return $string;
772 }
773
774 /**
775 * Decodes headers
776 *
777 * This function decodes strings that are encoded according to
778 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
779 * Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
780 *
781 * @param string $string header string that has to be made readable
782 * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
783 * @param boolean $htmlsafe preserve spaces and sanitize html special characters. defaults to true
784 * @param boolean $decide decide if string can be utfencoded. defaults to false
785 * @return string decoded header string
786 */
787 function decodeHeader ($string, $utfencode=true,$htmlsafe=true,$decide=false) {
788 global $languages, $squirrelmail_language,$default_charset;
789 if (is_array($string)) {
790 $string = implode("\n", $string);
791 }
792
793 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
794 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
795 $string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
796 // Do we need to return at this point?
797 // return $string;
798 }
799 $i = 0;
800 $iLastMatch = -2;
801 $encoded = true;
802
803 $aString = explode(' ',$string);
804 $ret = '';
805 foreach ($aString as $chunk) {
806 if ($encoded && $chunk === '') {
807 continue;
808 } elseif ($chunk === '') {
809 $ret .= ' ';
810 continue;
811 }
812 $encoded = false;
813 /* if encoded words are not separated by a linear-space-white we still catch them */
814 $j = $i-1;
815
816 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
817 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
818 if ($iLastMatch !== $j) {
819 if ($htmlsafe) {
820 $ret .= '&#32;';
821 } else {
822 $ret .= ' ';
823 }
824 }
825 $iLastMatch = $i;
826 $j = $i;
827 if ($htmlsafe) {
828 $ret .= htmlspecialchars($res[1]);
829 } else {
830 $ret .= $res[1];
831 }
832 $encoding = ucfirst($res[3]);
833
834 /* decide about valid decoding */
835 if ($decide && is_conversion_safe($res[2])) {
836 $utfencode=true;
837 $can_be_encoded=true;
838 } else {
839 $can_be_encoded=false;
840 }
841 switch ($encoding)
842 {
843 case 'B':
844 $replace = base64_decode($res[4]);
845 if ($utfencode) {
846 if ($can_be_encoded) {
847 /* convert string to different charset,
848 * if functions asks for it (usually in compose)
849 */
850 $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
851 } else {
852 // convert string to html codes in order to display it
853 $ret .= charset_decode($res[2],$replace);
854 }
855 } else {
856 if ($htmlsafe) {
857 $replace = htmlspecialchars($replace);
858 }
859 $ret.= $replace;
860 }
861 break;
862 case 'Q':
863 $replace = str_replace('_', ' ', $res[4]);
864 $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
865 $replace);
866 if ($utfencode) {
867 if ($can_be_encoded) {
868 /* convert string to different charset,
869 * if functions asks for it (usually in compose)
870 */
871 $replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
872 } else {
873 // convert string to html codes in order to display it
874 $replace = charset_decode($res[2], $replace);
875 }
876 } else {
877 if ($htmlsafe) {
878 $replace = htmlspecialchars($replace);
879 }
880 }
881 $ret .= $replace;
882 break;
883 default:
884 break;
885 }
886 $chunk = $res[5];
887 $encoded = true;
888 }
889 if (!$encoded) {
890 if ($htmlsafe) {
891 $ret .= '&#32;';
892 } else {
893 $ret .= ' ';
894 }
895 }
896
897 if (!$encoded && $htmlsafe) {
898 $ret .= htmlspecialchars($chunk);
899 } else {
900 $ret .= $chunk;
901 }
902 ++$i;
903 }
904 /* remove the first added space */
905 if ($ret) {
906 if ($htmlsafe) {
907 $ret = substr($ret,5);
908 } else {
909 $ret = substr($ret,1);
910 }
911 }
912
913 return $ret;
914 }
915
916 /**
917 * Encodes header
918 *
919 * Function uses XTRA_CODE _encodeheader function, if such function exists.
920 *
921 * Function uses Q encoding by default and encodes a string according to RFC
922 * 1522 for use in headers if it contains 8-bit characters or anything that
923 * looks like it should be encoded.
924 *
925 * Function switches to B encoding and encodeHeaderBase64() function, if
926 * string is 8bit and multibyte character set supported by mbstring extension
927 * is used. It can cause E_USER_NOTICE errors, if interface is used with
928 * multibyte character set unsupported by mbstring extension.
929 *
930 * @param string $string header string, that has to be encoded
931 * @return string quoted-printable encoded string
932 * @todo make $mb_charsets system wide constant
933 */
934 function encodeHeader ($string) {
935 global $default_charset, $languages, $squirrelmail_language;
936
937 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
938 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
939 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
940 }
941
942 // Use B encoding for multibyte charsets
943 $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
944 if (in_array($default_charset,$mb_charsets) &&
945 in_array($default_charset,sq_mb_list_encodings()) &&
946 sq_is8bit($string)) {
947 return encodeHeaderBase64($string,$default_charset);
948 } elseif (in_array($default_charset,$mb_charsets) &&
949 sq_is8bit($string) &&
950 ! in_array($default_charset,sq_mb_list_encodings())) {
951 // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
952 // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
953 }
954
955 // Encode only if the string contains 8-bit characters or =?
956 $j = strlen($string);
957 $max_l = 75 - strlen($default_charset) - 7;
958 $aRet = array();
959 $ret = '';
960 $iEncStart = $enc_init = false;
961 $cur_l = $iOffset = 0;
962 for($i = 0; $i < $j; ++$i) {
963 switch($string{$i})
964 {
965 case '"':
966 case '=':
967 case '<':
968 case '>':
969 case ',':
970 case '?':
971 case '_':
972 if ($iEncStart === false) {
973 $iEncStart = $i;
974 }
975 $cur_l+=3;
976 if ($cur_l > ($max_l-2)) {
977 /* if there is an stringpart that doesn't need encoding, add it */
978 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
979 $aRet[] = "=?$default_charset?Q?$ret?=";
980 $iOffset = $i;
981 $cur_l = 0;
982 $ret = '';
983 $iEncStart = false;
984 } else {
985 $ret .= sprintf("=%02X",ord($string{$i}));
986 }
987 break;
988 case '(':
989 case ')':
990 if ($iEncStart !== false) {
991 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
992 $aRet[] = "=?$default_charset?Q?$ret?=";
993 $iOffset = $i;
994 $cur_l = 0;
995 $ret = '';
996 $iEncStart = false;
997 }
998 break;
999 case ' ':
1000 if ($iEncStart !== false) {
1001 $cur_l++;
1002 if ($cur_l > $max_l) {
1003 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1004 $aRet[] = "=?$default_charset?Q?$ret?=";
1005 $iOffset = $i;
1006 $cur_l = 0;
1007 $ret = '';
1008 $iEncStart = false;
1009 } else {
1010 $ret .= '_';
1011 }
1012 }
1013 break;
1014 default:
1015 $k = ord($string{$i});
1016 if ($k > 126) {
1017 if ($iEncStart === false) {
1018 // do not start encoding in the middle of a string, also take the rest of the word.
1019 $sLeadString = substr($string,0,$i);
1020 $aLeadString = explode(' ',$sLeadString);
1021 $sToBeEncoded = array_pop($aLeadString);
1022 $iEncStart = $i - strlen($sToBeEncoded);
1023 $ret .= $sToBeEncoded;
1024 $cur_l += strlen($sToBeEncoded);
1025 }
1026 $cur_l += 3;
1027 /* first we add the encoded string that reached it's max size */
1028 if ($cur_l > ($max_l-2)) {
1029 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1030 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
1031 $cur_l = 3;
1032 $ret = '';
1033 $iOffset = $i;
1034 $iEncStart = $i;
1035 }
1036 $enc_init = true;
1037 $ret .= sprintf("=%02X", $k);
1038 } else {
1039 if ($iEncStart !== false) {
1040 $cur_l++;
1041 if ($cur_l > $max_l) {
1042 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1043 $aRet[] = "=?$default_charset?Q?$ret?=";
1044 $iEncStart = false;
1045 $iOffset = $i;
1046 $cur_l = 0;
1047 $ret = '';
1048 } else {
1049 $ret .= $string{$i};
1050 }
1051 }
1052 }
1053 break;
1054 }
1055 }
1056
1057 if ($enc_init) {
1058 if ($iEncStart !== false) {
1059 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1060 $aRet[] = "=?$default_charset?Q?$ret?=";
1061 } else {
1062 $aRet[] = substr($string,$iOffset);
1063 }
1064 $string = implode('',$aRet);
1065 }
1066 return $string;
1067 }
1068
1069 /**
1070 * Encodes string according to rfc2047 B encoding header formating rules
1071 *
1072 * It is recommended way to encode headers with character sets that store
1073 * symbols in more than one byte.
1074 *
1075 * Function requires mbstring support. If required mbstring functions are missing,
1076 * function returns false and sets E_USER_WARNING level error message.
1077 *
1078 * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1079 * that mbstring functions will generate E_WARNING errors, if unsupported
1080 * character set is used. mb_encode_mimeheader function provided by php
1081 * mbstring extension is not used in order to get better control of header
1082 * encoding.
1083 *
1084 * Used php code functions - function_exists(), trigger_error(), strlen()
1085 * (is used with charset names and base64 strings). Used php mbstring
1086 * functions - mb_strlen and mb_substr.
1087 *
1088 * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
1089 * encoding), rfc 2822 (header folding)
1090 *
1091 * @param string $string header string that must be encoded
1092 * @param string $charset character set. Must be supported by mbstring extension.
1093 * Use sq_mb_list_encodings() to detect supported charsets.
1094 * @return string string encoded according to rfc2047 B encoding formating rules
1095 * @since 1.5.1
1096 * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1097 * @todo Do we want to control max length of header?
1098 * @todo Do we want to control EOL (end-of-line) marker?
1099 * @todo Do we want to translate error message?
1100 */
1101 function encodeHeaderBase64($string,$charset) {
1102 /**
1103 * Check mbstring function requirements.
1104 */
1105 if (! function_exists('mb_strlen') ||
1106 ! function_exists('mb_substr')) {
1107 // set E_USER_WARNING
1108 trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1109 // return false
1110 return false;
1111 }
1112
1113 // initial return array
1114 $aRet = array();
1115
1116 /**
1117 * header length = 75 symbols max (same as in encodeHeader)
1118 * remove $charset length
1119 * remove =? ? ?= (5 chars)
1120 * remove 2 more chars (\r\n ?)
1121 */
1122 $iMaxLength = 75 - strlen($charset) - 7;
1123
1124 // set first character position
1125 $iStartCharNum = 0;
1126
1127 // loop through all characters. count characters and not bytes.
1128 for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1129 // encode string from starting character to current character.
1130 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1131
1132 // Check encoded string length
1133 if(strlen($encoded_string)>$iMaxLength) {
1134 // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1135 $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1136
1137 // set new starting character
1138 $iStartCharNum = $iCharNum-1;
1139
1140 // encode last char (in case it is last character in string)
1141 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1142 } // if string is shorter than max length - add next character
1143 }
1144
1145 // add last encoded string to array
1146 $aRet[] = $encoded_string;
1147
1148 // set initial return string
1149 $sRet = '';
1150
1151 // loop through encoded strings
1152 foreach($aRet as $string) {
1153 // TODO: Do we want to control EOL (end-of-line) marker
1154 if ($sRet!='') $sRet.= " ";
1155
1156 // add header tags and encoded string to return string
1157 $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1158 }
1159
1160 return $sRet;
1161 }
1162
1163 /* This function trys to locate the entity_id of a specific mime element */
1164 function find_ent_id($id, $message) {
1165 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1166 if ($message->entities[$i]->header->type0 == 'multipart') {
1167 $ret = find_ent_id($id, $message->entities[$i]);
1168 } else {
1169 if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
1170 // if (sq_check_save_extension($message->entities[$i])) {
1171 return $message->entities[$i]->entity_id;
1172 // }
1173 } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1174 /**
1175 * This is part of a fix for Outlook Express 6.x generating
1176 * cid URLs without creating content-id headers
1177 * @@JA - 20050207
1178 */
1179 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1180 return $message->entities[$i]->entity_id;
1181 }
1182 }
1183 }
1184 }
1185 return $ret;
1186 }
1187
1188 function sq_check_save_extension($message) {
1189 $filename = $message->getFilename();
1190 $ext = substr($filename, strrpos($filename,'.')+1);
1191 $save_extensions = array('jpg','jpeg','gif','png','bmp');
1192 return in_array($ext, $save_extensions);
1193 }
1194
1195
1196 /**
1197 ** HTMLFILTER ROUTINES
1198 */
1199
1200 /**
1201 * This function checks attribute values for entity-encoded values
1202 * and returns them translated into 8-bit strings so we can run
1203 * checks on them.
1204 *
1205 * @param $attvalue A string to run entity check against.
1206 * @return Nothing, modifies a reference value.
1207 */
1208 function sq_defang(&$attvalue){
1209 $me = 'sq_defang';
1210 /**
1211 * Skip this if there aren't ampersands or backslashes.
1212 */
1213 if (strpos($attvalue, '&') === false
1214 && strpos($attvalue, '\\') === false){
1215 return;
1216 }
1217 $m = false;
1218 // before deent, translate the dangerous unicode characters and ... to safe values
1219 // otherwise the regular expressions do not match.
1220
1221
1222
1223 do {
1224 $m = false;
1225 $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1226 $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1227 $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1228 } while ($m == true);
1229 $attvalue = stripslashes($attvalue);
1230 }
1231
1232 /**
1233 * Kill any tabs, newlines, or carriage returns. Our friends the
1234 * makers of the browser with 95% market value decided that it'd
1235 * be funny to make "java[tab]script" be just as good as "javascript".
1236 *
1237 * @param attvalue The attribute value before extraneous spaces removed.
1238 * @return attvalue Nothing, modifies a reference value.
1239 */
1240 function sq_unspace(&$attvalue){
1241 $me = 'sq_unspace';
1242 if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1243 $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1244 Array('', '', '', '', ''), $attvalue);
1245 }
1246 }
1247
1248 /**
1249 * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
1250 * IE as regular characters.
1251 *
1252 * @param attvalue The attribute value before dangerous characters are translated.
1253 * @return attvalue Nothing, modifies a reference value.
1254 * @author Marc Groot Koerkamp.
1255 */
1256 function sq_fixIE_idiocy(&$attvalue) {
1257 // remove NUL
1258 $attvalue = str_replace("\0", "", $attvalue);
1259 // remove comments
1260 $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1261
1262 // IE has the evil habit of accepting every possible value for the attribute expression.
1263 // The table below contains characters which are parsed by IE if they are used in the "expression"
1264 // attribute value.
1265 $aDangerousCharsReplacementTable = array(
1266 array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1267 '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1268 '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
1269 '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1270 '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
1271 '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1272 '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1273 '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1274 '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1275 '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1276 '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1277 '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1278 '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1279 '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1280 '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1281 '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1282 '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1283 '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1284 '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1285 '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1286 '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1287 '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1288 '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1289 '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
1290 "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range
1291 "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1292 "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1293 "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1294 "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1295 "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1296 "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1297 "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1298 "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1299 "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1300 "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1301 "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1302 "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1303 "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1304 "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1305 "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1306 "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1307 "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1308 "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1309 "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1310 "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1311 "\xCA\x9F", /* L UNICODE IPA Extension */
1312 "\xCA\x80", /* R UNICODE IPA Extension */
1313 "\xC9\xB4"), /* N UNICODE IPA Extension */
1314 array('l', 'l', 'r','r','n','n',
1315 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1316 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1317 'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
1318 $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1319
1320 // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1321 // used for XSS.
1322 $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1323 }
1324
1325 /**
1326 * This function returns the final tag out of the tag name, an array
1327 * of attributes, and the type of the tag. This function is called by
1328 * sq_sanitize internally.
1329 *
1330 * @param $tagname the name of the tag.
1331 * @param $attary the array of attributes and their values
1332 * @param $tagtype The type of the tag (see in comments).
1333 * @return a string with the final tag representation.
1334 */
1335 function sq_tagprint($tagname, $attary, $tagtype){
1336 $me = 'sq_tagprint';
1337
1338 if ($tagtype == 2){
1339 $fulltag = '</' . $tagname . '>';
1340 } else {
1341 $fulltag = '<' . $tagname;
1342 if (is_array($attary) && sizeof($attary)){
1343 $atts = Array();
1344 while (list($attname, $attvalue) = each($attary)){
1345 array_push($atts, "$attname=$attvalue");
1346 }
1347 $fulltag .= ' ' . join(" ", $atts);
1348 }
1349 if ($tagtype == 3){
1350 $fulltag .= ' /';
1351 }
1352 $fulltag .= '>';
1353 }
1354 return $fulltag;
1355 }
1356
1357 /**
1358 * A small helper function to use with array_walk. Modifies a by-ref
1359 * value and makes it lowercase.
1360 *
1361 * @param $val a value passed by-ref.
1362 * @return void since it modifies a by-ref value.
1363 */
1364 function sq_casenormalize(&$val){
1365 $val = strtolower($val);
1366 }
1367
1368 /**
1369 * This function skips any whitespace from the current position within
1370 * a string and to the next non-whitespace value.
1371 *
1372 * @param $body the string
1373 * @param $offset the offset within the string where we should start
1374 * looking for the next non-whitespace character.
1375 * @return the location within the $body where the next
1376 * non-whitespace char is located.
1377 */
1378 function sq_skipspace($body, $offset){
1379 $me = 'sq_skipspace';
1380 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
1381 if (sizeof($matches{1})){
1382 $count = strlen($matches{1});
1383 $offset += $count;
1384 }
1385 return $offset;
1386 }
1387
1388 /**
1389 * This function looks for the next character within a string. It's
1390 * really just a glorified "strpos", except it catches if failures
1391 * nicely.
1392 *
1393 * @param $body The string to look for needle in.
1394 * @param $offset Start looking from this position.
1395 * @param $needle The character/string to look for.
1396 * @return location of the next occurance of the needle, or
1397 * strlen($body) if needle wasn't found.
1398 */
1399 function sq_findnxstr($body, $offset, $needle){
1400 $me = 'sq_findnxstr';
1401 $pos = strpos($body, $needle, $offset);
1402 if ($pos === FALSE){
1403 $pos = strlen($body);
1404 }
1405 return $pos;
1406 }
1407
1408 /**
1409 * This function takes a PCRE-style regexp and tries to match it
1410 * within the string.
1411 *
1412 * @param $body The string to look for needle in.
1413 * @param $offset Start looking from here.
1414 * @param $reg A PCRE-style regex to match.
1415 * @return Returns a false if no matches found, or an array
1416 * with the following members:
1417 * - integer with the location of the match within $body
1418 * - string with whatever content between offset and the match
1419 * - string with whatever it is we matched
1420 */
1421 function sq_findnxreg($body, $offset, $reg){
1422 $me = 'sq_findnxreg';
1423 $matches = Array();
1424 $retarr = Array();
1425 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1426 if (!isset($matches{0}) || !$matches{0}){
1427 $retarr = false;
1428 } else {
1429 $retarr{0} = $offset + strlen($matches{1});
1430 $retarr{1} = $matches{1};
1431 $retarr{2} = $matches{2};
1432 }
1433 return $retarr;
1434 }
1435
1436 /**
1437 * This function looks for the next tag.
1438 *
1439 * @param $body String where to look for the next tag.
1440 * @param $offset Start looking from here.
1441 * @return false if no more tags exist in the body, or
1442 * an array with the following members:
1443 * - string with the name of the tag
1444 * - array with attributes and their values
1445 * - integer with tag type (1, 2, or 3)
1446 * - integer where the tag starts (starting "<")
1447 * - integer where the tag ends (ending ">")
1448 * first three members will be false, if the tag is invalid.
1449 */
1450 function sq_getnxtag($body, $offset){
1451 $me = 'sq_getnxtag';
1452 if ($offset > strlen($body)){
1453 return false;
1454 }
1455 $lt = sq_findnxstr($body, $offset, "<");
1456 if ($lt == strlen($body)){
1457 return false;
1458 }
1459 /**
1460 * We are here:
1461 * blah blah <tag attribute="value">
1462 * \---------^
1463 */
1464 $pos = sq_skipspace($body, $lt+1);
1465 if ($pos >= strlen($body)){
1466 return Array(false, false, false, $lt, strlen($body));
1467 }
1468 /**
1469 * There are 3 kinds of tags:
1470 * 1. Opening tag, e.g.:
1471 * <a href="blah">
1472 * 2. Closing tag, e.g.:
1473 * </a>
1474 * 3. XHTML-style content-less tag, e.g.:
1475 * <img src="blah" />
1476 */
1477 $tagtype = false;
1478 switch (substr($body, $pos, 1)){
1479 case '/':
1480 $tagtype = 2;
1481 $pos++;
1482 break;
1483 case '!':
1484 /**
1485 * A comment or an SGML declaration.
1486 */
1487 if (substr($body, $pos+1, 2) == "--"){
1488 $gt = strpos($body, "-->", $pos);
1489 if ($gt === false){
1490 $gt = strlen($body);
1491 } else {
1492 $gt += 2;
1493 }
1494 return Array(false, false, false, $lt, $gt);
1495 } else {
1496 $gt = sq_findnxstr($body, $pos, ">");
1497 return Array(false, false, false, $lt, $gt);
1498 }
1499 break;
1500 default:
1501 /**
1502 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1503 * later.
1504 */
1505 $tagtype = 1;
1506 break;
1507 }
1508
1509 $tag_start = $pos;
1510 $tagname = '';
1511 /**
1512 * Look for next [\W-_], which will indicate the end of the tag name.
1513 */
1514 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1515 if ($regary == false){
1516 return Array(false, false, false, $lt, strlen($body));
1517 }
1518 list($pos, $tagname, $match) = $regary;
1519 $tagname = strtolower($tagname);
1520
1521 /**
1522 * $match can be either of these:
1523 * '>' indicating the end of the tag entirely.
1524 * '\s' indicating the end of the tag name.
1525 * '/' indicating that this is type-3 xhtml tag.
1526 *
1527 * Whatever else we find there indicates an invalid tag.
1528 */
1529 switch ($match){
1530 case '/':
1531 /**
1532 * This is an xhtml-style tag with a closing / at the
1533 * end, like so: <img src="blah" />. Check if it's followed
1534 * by the closing bracket. If not, then this tag is invalid
1535 */
1536 if (substr($body, $pos, 2) == "/>"){
1537 $pos++;
1538 $tagtype = 3;
1539 } else {
1540 $gt = sq_findnxstr($body, $pos, ">");
1541 $retary = Array(false, false, false, $lt, $gt);
1542 return $retary;
1543 }
1544 case '>':
1545 return Array($tagname, false, $tagtype, $lt, $pos);
1546 break;
1547 default:
1548 /**
1549 * Check if it's whitespace
1550 */
1551 if (!preg_match('/\s/', $match)){
1552 /**
1553 * This is an invalid tag! Look for the next closing ">".
1554 */
1555 $gt = sq_findnxstr($body, $lt, ">");
1556 return Array(false, false, false, $lt, $gt);
1557 }
1558 break;
1559 }
1560
1561 /**
1562 * At this point we're here:
1563 * <tagname attribute='blah'>
1564 * \-------^
1565 *
1566 * At this point we loop in order to find all attributes.
1567 */
1568 $attname = '';
1569 $atttype = false;
1570 $attary = Array();
1571
1572 while ($pos <= strlen($body)){
1573 $pos = sq_skipspace($body, $pos);
1574 if ($pos == strlen($body)){
1575 /**
1576 * Non-closed tag.
1577 */
1578 return Array(false, false, false, $lt, $pos);
1579 }
1580 /**
1581 * See if we arrived at a ">" or "/>", which means that we reached
1582 * the end of the tag.
1583 */
1584 $matches = Array();
1585 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
1586 /**
1587 * Yep. So we did.
1588 */
1589 $pos += strlen($matches{1});
1590 if ($matches{2} == "/>"){
1591 $tagtype = 3;
1592 $pos++;
1593 }
1594 return Array($tagname, $attary, $tagtype, $lt, $pos);
1595 }
1596
1597 /**
1598 * There are several types of attributes, with optional
1599 * [:space:] between members.
1600 * Type 1:
1601 * attrname[:space:]=[:space:]'CDATA'
1602 * Type 2:
1603 * attrname[:space:]=[:space:]"CDATA"
1604 * Type 3:
1605 * attr[:space:]=[:space:]CDATA
1606 * Type 4:
1607 * attrname
1608 *
1609 * We leave types 1 and 2 the same, type 3 we check for
1610 * '"' and convert to "&quot" if needed, then wrap in
1611 * double quotes. Type 4 we convert into:
1612 * attrname="yes".
1613 */
1614 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
1615 if ($regary == false){
1616 /**
1617 * Looks like body ended before the end of tag.
1618 */
1619 return Array(false, false, false, $lt, strlen($body));
1620 }
1621 list($pos, $attname, $match) = $regary;
1622 $attname = strtolower($attname);
1623 /**
1624 * We arrived at the end of attribute name. Several things possible
1625 * here:
1626 * '>' means the end of the tag and this is attribute type 4
1627 * '/' if followed by '>' means the same thing as above
1628 * '\s' means a lot of things -- look what it's followed by.
1629 * anything else means the attribute is invalid.
1630 */
1631 switch($match){
1632 case '/':
1633 /**
1634 * This is an xhtml-style tag with a closing / at the
1635 * end, like so: <img src="blah" />. Check if it's followed
1636 * by the closing bracket. If not, then this tag is invalid
1637 */
1638 if (substr($body, $pos, 2) == "/>"){
1639 $pos++;
1640 $tagtype = 3;
1641 } else {
1642 $gt = sq_findnxstr($body, $pos, ">");
1643 $retary = Array(false, false, false, $lt, $gt);
1644 return $retary;
1645 }
1646 case '>':
1647 $attary{$attname} = '"yes"';
1648 return Array($tagname, $attary, $tagtype, $lt, $pos);
1649 break;
1650 default:
1651 /**
1652 * Skip whitespace and see what we arrive at.
1653 */
1654 $pos = sq_skipspace($body, $pos);
1655 $char = substr($body, $pos, 1);
1656 /**
1657 * Two things are valid here:
1658 * '=' means this is attribute type 1 2 or 3.
1659 * \w means this was attribute type 4.
1660 * anything else we ignore and re-loop. End of tag and
1661 * invalid stuff will be caught by our checks at the beginning
1662 * of the loop.
1663 */
1664 if ($char == "="){
1665 $pos++;
1666 $pos = sq_skipspace($body, $pos);
1667 /**
1668 * Here are 3 possibilities:
1669 * "'" attribute type 1
1670 * '"' attribute type 2
1671 * everything else is the content of tag type 3
1672 */
1673 $quot = substr($body, $pos, 1);
1674 if ($quot == "'"){
1675 $regary = sq_findnxreg($body, $pos+1, "\'");
1676 if ($regary == false){
1677 return Array(false, false, false, $lt, strlen($body));
1678 }
1679 list($pos, $attval, $match) = $regary;
1680 $pos++;
1681 $attary{$attname} = "'" . $attval . "'";
1682 } else if ($quot == '"'){
1683 $regary = sq_findnxreg($body, $pos+1, '\"');
1684 if ($regary == false){
1685 return Array(false, false, false, $lt, strlen($body));
1686 }
1687 list($pos, $attval, $match) = $regary;
1688 $pos++;
1689 $attary{$attname} = '"' . $attval . '"';
1690 } else {
1691 /**
1692 * These are hateful. Look for \s, or >.
1693 */
1694 $regary = sq_findnxreg($body, $pos, "[\s>]");
1695 if ($regary == false){
1696 return Array(false, false, false, $lt, strlen($body));
1697 }
1698 list($pos, $attval, $match) = $regary;
1699 /**
1700 * If it's ">" it will be caught at the top.
1701 */
1702 $attval = preg_replace("/\"/s", "&quot;", $attval);
1703 $attary{$attname} = '"' . $attval . '"';
1704 }
1705 } else if (preg_match("|[\w/>]|", $char)) {
1706 /**
1707 * That was attribute type 4.
1708 */
1709 $attary{$attname} = '"yes"';
1710 } else {
1711 /**
1712 * An illegal character. Find next '>' and return.
1713 */
1714 $gt = sq_findnxstr($body, $pos, ">");
1715 return Array(false, false, false, $lt, $gt);
1716 }
1717 break;
1718 }
1719 }
1720 /**
1721 * The fact that we got here indicates that the tag end was never
1722 * found. Return invalid tag indication so it gets stripped.
1723 */
1724 return Array(false, false, false, $lt, strlen($body));
1725 }
1726
1727 /**
1728 * Translates entities into literal values so they can be checked.
1729 *
1730 * @param $attvalue the by-ref value to check.
1731 * @param $regex the regular expression to check against.
1732 * @param $hex whether the entites are hexadecimal.
1733 * @return True or False depending on whether there were matches.
1734 */
1735 function sq_deent(&$attvalue, $regex, $hex=false){
1736 $me = 'sq_deent';
1737 $ret_match = false;
1738 // remove comments
1739 //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
1740 preg_match_all($regex, $attvalue, $matches);
1741 if (is_array($matches) && sizeof($matches[0]) > 0){
1742 $repl = Array();
1743 for ($i = 0; $i < sizeof($matches[0]); $i++){
1744 $numval = $matches[1][$i];
1745 if ($hex){
1746 $numval = hexdec($numval);
1747 }
1748 $repl{$matches[0][$i]} = chr($numval);
1749 }
1750 $attvalue = strtr($attvalue, $repl);
1751 return true;
1752 } else {
1753 return false;
1754 }
1755 }
1756
1757 /**
1758 * This function runs various checks against the attributes.
1759 *
1760 * @param $tagname String with the name of the tag.
1761 * @param $attary Array with all tag attributes.
1762 * @param $rm_attnames See description for sq_sanitize
1763 * @param $bad_attvals See description for sq_sanitize
1764 * @param $add_attr_to_tag See description for sq_sanitize
1765 * @param $message message object
1766 * @param $id message id
1767 * @return Array with modified attributes.
1768 */
1769 function sq_fixatts($tagname,
1770 $attary,
1771 $rm_attnames,
1772 $bad_attvals,
1773 $add_attr_to_tag,
1774 $message,
1775 $id,
1776 $mailbox
1777 ){
1778 $me = 'sq_fixatts';
1779 while (list($attname, $attvalue) = each($attary)){
1780 /**
1781 * See if this attribute should be removed.
1782 */
1783 foreach ($rm_attnames as $matchtag=>$matchattrs){
1784 if (preg_match($matchtag, $tagname)){
1785 foreach ($matchattrs as $matchattr){
1786 if (preg_match($matchattr, $attname)){
1787 unset($attary{$attname});
1788 continue;
1789 }
1790 }
1791 }
1792 }
1793 /**
1794 * Workaround for IE quirks
1795 */
1796 sq_fixIE_idiocy($attvalue);
1797
1798 /**
1799 * Remove any backslashes, entities, and extraneous whitespace.
1800 */
1801
1802 $oldattvalue = $attvalue;
1803 sq_defang($attvalue);
1804 if ($attname == 'style' && $attvalue !== $oldattvalue) {
1805 // entities are used in the attribute value. In 99% of the cases it's there as XSS
1806 // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1807 $attvalue = "idiocy";
1808 $attary{$attname} = $attvalue;
1809 }
1810 sq_unspace($attvalue);
1811
1812 /**
1813 * Now let's run checks on the attvalues.
1814 * I don't expect anyone to comprehend this. If you do,
1815 * get in touch with me so I can drive to where you live and
1816 * shake your hand personally. :)
1817 */
1818 foreach ($bad_attvals as $matchtag=>$matchattrs){
1819 if (preg_match($matchtag, $tagname)){
1820 foreach ($matchattrs as $matchattr=>$valary){
1821 if (preg_match($matchattr, $attname)){
1822 /**
1823 * There are two arrays in valary.
1824 * First is matches.
1825 * Second one is replacements
1826 */
1827 list($valmatch, $valrepl) = $valary;
1828 $newvalue =
1829 preg_replace($valmatch, $valrepl, $attvalue);
1830 if ($newvalue != $attvalue){
1831 $attary{$attname} = $newvalue;
1832 $attvalue = $newvalue;
1833 }
1834 }
1835 }
1836 }
1837 }
1838 if ($attname == 'style') {
1839 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1840 // 8bit and control characters in style attribute values can be used for XSS, remove them
1841 $attary{$attname} = '"disallowed character"';
1842 }
1843 preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1844 if (count($aMatch)) {
1845 foreach($aMatch[1] as $sMatch) {
1846 // url value
1847 $urlvalue = $sMatch;
1848 sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1849 $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1850 }
1851 }
1852 }
1853 /**
1854 * Use white list based filtering on attributes which can contain url's
1855 */
1856 else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
1857 sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1858 $attary{$attname} = $attvalue;
1859 }
1860 }
1861 /**
1862 * See if we need to append any attributes to this tag.
1863 */
1864 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1865 if (preg_match($matchtag, $tagname)){
1866 $attary = array_merge($attary, $addattary);
1867 }
1868 }
1869 return $attary;
1870 }
1871
1872 /**
1873 * This function filters url's
1874 *
1875 * @param $attvalue String with attribute value to filter
1876 * @param $message message object
1877 * @param $id message id
1878 * @param $mailbox mailbox
1879 * @param $sQuote quoting characters around url's
1880 */
1881 function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1882 $attvalue = trim($attvalue);
1883 if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1884 // remove the double quotes
1885 $sQuote = $attvalue[0];
1886 $attvalue = trim(substr($attvalue,1,-1));
1887 }
1888
1889 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
1890 // images off by default.
1891 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
1892
1893 $secremoveimg = '../images/' . _("sec_remove_eng.png");
1894
1895 /**
1896 * Replace empty src tags with the blank image. src is only used
1897 * for frames, images, and image inputs. Doing a replace should
1898 * not affect them working as should be, however it will stop
1899 * IE from being kicked off when src for img tags are not set
1900 */
1901 if ($attvalue == '') {
1902 $attvalue = '"' . SM_PATH . 'images/blank.png"';
1903 } else {
1904 // first, disallow 8 bit characters and control characters
1905 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1906 switch ($attname) {
1907 case 'href':
1908 $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1909 break;
1910 default:
1911 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1912 break;
1913 }
1914 } else {
1915 $aUrl = parse_url($attvalue);
1916 if (isset($aUrl['scheme'])) {
1917 switch(strtolower($aUrl['scheme'])) {
1918 case 'mailto':
1919 case 'http':
1920 case 'https':
1921 case 'ftp':
1922 if ($attname != 'href') {
1923 if ($view_unsafe_images == false) {
1924 $attvalue = $sQuote . $secremoveimg . $sQuote;
1925 } else {
1926 if (isset($aUrl['path'])) {
1927
1928 // No one has been able to show that image URIs
1929 // can be exploited, so for now, no restrictions
1930 // are made at all. If this proves to be a problem,
1931 // the commented-out code below can be of help.
1932 // (One consideration is that I see nothing in this
1933 // function that specifically says that we will
1934 // only ever arrive here when inspecting an image
1935 // tag, although that does seem to be the end
1936 // result - e.g., <script src="..."> where malicious
1937 // image URIs are in fact a problem are already
1938 // filtered out elsewhere.
1939 /* ---------------------------------
1940 // validate image extension.
1941 $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1942 if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
1943 // If URI is to something other than
1944 // a regular image file, get the contents
1945 // and try to see if it is an image.
1946 // Don't use Fileinfo (finfo_file()) because
1947 // we'd need to make the admin configure the
1948 // location of the magic.mime file (FIXME: add finfo_file() support later?)
1949 //
1950 $mime_type = '';
1951 if (function_exists('mime_content_type')
1952 && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
1953
1954 // fetch file
1955 //
1956 $file_contents = '';
1957 while (!feof($FILE)) {
1958 $file_contents .= fread($FILE, 8192);
1959 }
1960 fclose($FILE);
1961
1962 // store file locally
1963 //
1964 global $attachment_dir, $username;
1965 $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
1966 $localfilename = GenerateRandomString(32, '', 7);
1967 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1968 while (file_exists($full_localfilename)) {
1969 $localfilename = GenerateRandomString(32, '', 7);
1970 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1971 }
1972 $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
1973 fwrite($FILE, $file_contents);
1974 fclose($FILE);
1975
1976 // get mime type and remove file
1977 //
1978 $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
1979 unlink("$hashed_attachment_dir/$localfilename");
1980 }
1981 // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
1982 if (substr(strtolower($mime_type), 0, 5) != 'image') {
1983 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1984 }
1985 }
1986 --------------------------------- */
1987 } else {
1988 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1989 }
1990 }
1991 } else {
1992 $attvalue = $sQuote . $attvalue . $sQuote;
1993 }
1994 break;
1995 case 'outbind':
1996 /**
1997 * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
1998 * One day MS might actually make it match something useful, for now, falling
1999 * back to using cid2http, so we can grab the blank.png.
2000 */
2001 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
2002 break;
2003 case 'cid':
2004 /**
2005 * Turn cid: urls into http-friendly ones.
2006 */
2007 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
2008 break;
2009 default:
2010 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2011 break;
2012 }
2013 } else {
2014 if (!(isset($aUrl['path']) && $aUrl['path'] == $secremoveimg)) {
2015 // parse_url did not lead to satisfying result
2016 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2017 }
2018 }
2019 }
2020 }
2021 }
2022
2023 /**
2024 * This function edits the style definition to make them friendly and
2025 * usable in SquirrelMail.
2026 *
2027 * @param $message the message object
2028 * @param $id the message id
2029 * @param $content a string with whatever is between <style> and </style>
2030 * @param $mailbox the message mailbox
2031 * @return a string with edited content.
2032 */
2033 function sq_fixstyle($body, $pos, $message, $id, $mailbox){
2034 $me = 'sq_fixstyle';
2035 // workaround for </style> in between comments
2036 $iCurrentPos = $pos;
2037 $content = '';
2038 $sToken = '';
2039 $bSucces = false;
2040 $bEndTag = false;
2041 for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
2042 $char = $body{$i};
2043 switch ($char) {
2044 case '<':
2045 $sToken = $char;
2046 break;
2047 case '/':
2048 if ($sToken == '<') {
2049 $sToken .= $char;
2050 $bEndTag = true;
2051 } else {
2052 $content .= $char;
2053 }
2054 break;
2055 case '>':
2056 if ($bEndTag) {
2057 $sToken .= $char;
2058 if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
2059 $newpos = $i + 1;
2060 $bSucces = true;
2061 break 2;
2062 } else {
2063 $content .= $sToken;
2064 }
2065 $bEndTag = false;
2066 } else {
2067 $content .= $char;
2068 }
2069 break;
2070 case '!':
2071 if ($sToken == '<') {
2072 // possible comment
2073 if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
2074 $i = strpos($body,'-->',$i+3);
2075 if ($i === false) { // no end comment
2076 $i = strlen($body);
2077 }
2078 $sToken = '';
2079 }
2080 } else {
2081 $content .= $char;
2082 }
2083 break;
2084 default:
2085 if ($bEndTag) {
2086 $sToken .= $char;
2087 } else {
2088 $content .= $char;
2089 }
2090 break;
2091 }
2092 }
2093 if ($bSucces == FALSE){
2094 return array(FALSE, strlen($body));
2095 }
2096
2097
2098
2099 /**
2100 * First look for general BODY style declaration, which would be
2101 * like so:
2102 * body {background: blah-blah}
2103 * and change it to .bodyclass so we can just assign it to a <div>
2104 */
2105 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
2106 $secremoveimg = '../images/' . _("sec_remove_eng.png");
2107 /**
2108 * Fix url('blah') declarations.
2109 */
2110 // $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
2111 // "url(\\1$secremoveimg\\2)", $content);
2112
2113 // first check for 8bit sequences and disallowed control characters
2114 if (preg_match('/[\16-\37\200-\377]+/',$content)) {
2115 $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
2116 return array($content, $newpos);
2117 }
2118
2119 // IE Sucks hard. We have a special function for it.
2120 sq_fixIE_idiocy($content);
2121
2122 // remove @import line
2123 $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2124
2125 // translate ur\l and variations (IE parses that)
2126 // TODO check if the sq_fixIE_idiocy function already handles this.
2127 $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
2128 preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2129 if (count($aMatch)) {
2130 $aValue = $aReplace = array();
2131 foreach($aMatch[1] as $sMatch) {
2132 // url value
2133 $urlvalue = $sMatch;
2134 sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2135 $aValue[] = $sMatch;
2136 $aReplace[] = $urlvalue;
2137 }
2138 $content = str_replace($aValue,$aReplace,$content);
2139 }
2140
2141 /**
2142 * Remove any backslashes, entities, and extraneous whitespace.
2143 */
2144 $contentTemp = $content;
2145 sq_defang($contentTemp);
2146 sq_unspace($contentTemp);
2147
2148 /**
2149 * Fix stupid css declarations which lead to vulnerabilities
2150 * in IE.
2151 *
2152 * Also remove "position" attribute, as it can easily be set
2153 * to "fixed" or "absolute" with "left" and "top" attributes
2154 * of zero, taking over the whole content frame. It can also
2155 * be set to relative and move itself anywhere it wants to,
2156 * displaying content in areas it shouldn't be allowed to touch.
2157 */
2158 $match = Array('/\/\*.*\*\//',
2159 '/expression/i',
2160 '/behaviou*r/i',
2161 '/binding/i',
2162 '/include-source/i',
2163 '/javascript/i',
2164 '/script/i',
2165 '/position/i');
2166 $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
2167 $contentNew = preg_replace($match, $replace, $contentTemp);
2168 if ($contentNew !== $contentTemp) {
2169 // insecure css declarations are used. From now on we don't care
2170 // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2171 $content = $contentNew;
2172 }
2173 return array($content, $newpos);
2174 }
2175
2176
2177 /**
2178 * This function converts cid: url's into the ones that can be viewed in
2179 * the browser.
2180 *
2181 * @param $message the message object
2182 * @param $id the message id
2183 * @param $cidurl the cid: url.
2184 * @param $mailbox the message mailbox
2185 * @return a string with a http-friendly url
2186 */
2187 function sq_cid2http($message, $id, $cidurl, $mailbox){
2188 /**
2189 * Get rid of quotes.
2190 */
2191 $quotchar = substr($cidurl, 0, 1);
2192 if ($quotchar == '"' || $quotchar == "'"){
2193 $cidurl = str_replace($quotchar, "", $cidurl);
2194 } else {
2195 $quotchar = '';
2196 }
2197 $cidurl = substr(trim($cidurl), 4);
2198
2199 $match_str = '/\{.*?\}\//';
2200 $str_rep = '';
2201 $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2202
2203 $linkurl = find_ent_id($cidurl, $message);
2204 /* in case of non-safe cid links $httpurl should be replaced by a sort of
2205 unsafe link image */
2206 $httpurl = '';
2207
2208 /**
2209 * This is part of a fix for Outlook Express 6.x generating
2210 * cid URLs without creating content-id headers. These images are
2211 * not part of the multipart/related html mail. The html contains
2212 * <img src="cid:{some_id}/image_filename.ext"> references to
2213 * attached images with as goal to render them inline although
2214 * the attachment disposition property is not inline.
2215 */
2216
2217 if (empty($linkurl)) {
2218 if (preg_match('/{.*}\//', $cidurl)) {
2219 $cidurl = preg_replace('/{.*}\//','', $cidurl);
2220 if (!empty($cidurl)) {
2221 $linkurl = find_ent_id($cidurl, $message);
2222 }
2223 }
2224 }
2225
2226 if (!empty($linkurl)) {
2227 $httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&amp;' .
2228 "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2229 '&amp;ent_id=' . $linkurl . $quotchar;
2230 } else {
2231 /**
2232 * If we couldn't generate a proper img url, drop in a blank image
2233 * instead of sending back empty, otherwise it causes unusual behaviour
2234 */
2235 $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
2236 }
2237
2238 return $httpurl;
2239 }
2240
2241 /**
2242 * This function changes the <body> tag into a <div> tag since we
2243 * can't really have a body-within-body.
2244 *
2245 * @param $attary an array of attributes and values of <body>
2246 * @param $mailbox mailbox we're currently reading (for cid2http)
2247 * @param $message current message (for cid2http)
2248 * @param $id current message id (for cid2http)
2249 * @return a modified array of attributes to be set for <div>
2250 */
2251 function sq_body2div($attary, $mailbox, $message, $id){
2252 $me = 'sq_body2div';
2253 $divattary = Array('class' => "'bodyclass'");
2254 $text = '#000000';
2255 $has_bgc_stl = $has_txt_stl = false;
2256 $styledef = '';
2257 if (is_array($attary) && sizeof($attary) > 0){
2258 foreach ($attary as $attname=>$attvalue){
2259 $quotchar = substr($attvalue, 0, 1);
2260 $attvalue = str_replace($quotchar, "", $attvalue);
2261 switch ($attname){
2262 case 'background':
2263 $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
2264 $styledef .= "background-image: url('$attvalue'); ";
2265 break;
2266 case 'bgcolor':
2267 $has_bgc_stl = true;
2268 $styledef .= "background-color: $attvalue; ";
2269 break;
2270 case 'text':
2271 $has_txt_stl = true;
2272 $styledef .= "color: $attvalue; ";
2273 break;
2274 }
2275 }
2276 // Outlook defines a white bgcolor and no text color. This can lead to
2277 // white text on a white bg with certain themes.
2278 if ($has_bgc_stl && !$has_txt_stl) {
2279 $styledef .= "color: $text; ";
2280 }
2281 if (strlen($styledef) > 0){
2282 $divattary{"style"} = "\"$styledef\"";
2283 }
2284 }
2285 return $divattary;
2286 }
2287
2288 /**
2289 * This is the main function and the one you should actually be calling.
2290 * There are several variables you should be aware of an which need
2291 * special description.
2292 *
2293 * Since the description is quite lengthy, see it here:
2294 * http://linux.duke.edu/projects/mini/htmlfilter/
2295 *
2296 * @param $body the string with HTML you wish to filter
2297 * @param $tag_list see description above
2298 * @param $rm_tags_with_content see description above
2299 * @param $self_closing_tags see description above
2300 * @param $force_tag_closing see description above
2301 * @param $rm_attnames see description above
2302 * @param $bad_attvals see description above
2303 * @param $add_attr_to_tag see description above
2304 * @param $message message object
2305 * @param $id message id
2306 * @return sanitized html safe to show on your pages.
2307 */
2308 function sq_sanitize($body,
2309 $tag_list,
2310 $rm_tags_with_content,
2311 $self_closing_tags,
2312 $force_tag_closing,
2313 $rm_attnames,
2314 $bad_attvals,
2315 $add_attr_to_tag,
2316 $message,
2317 $id,
2318 $mailbox
2319 ){
2320 $me = 'sq_sanitize';
2321 $rm_tags = array_shift($tag_list);
2322 /**
2323 * Normalize rm_tags and rm_tags_with_content.
2324 */
2325 @array_walk($tag_list, 'sq_casenormalize');
2326 @array_walk($rm_tags_with_content, 'sq_casenormalize');
2327 @array_walk($self_closing_tags, 'sq_casenormalize');
2328 /**
2329 * See if tag_list is of tags to remove or tags to allow.
2330 * false means remove these tags
2331 * true means allow these tags
2332 */
2333 $curpos = 0;
2334 $open_tags = Array();
2335 $trusted = "\n<!-- begin sanitized html -->\n";
2336 $skip_content = false;
2337 /**
2338 * Take care of netscape's stupid javascript entities like
2339 * &{alert('boo')};
2340 */
2341 $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
2342
2343 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
2344 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
2345 $free_content = substr($body, $curpos, $lt-$curpos);
2346 /**
2347 * Take care of <style>
2348 */
2349 if ($tagname == "style" && $tagtype == 1){
2350 list($free_content, $curpos) =
2351 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
2352 if ($free_content != FALSE){
2353 if ( !empty($attary) ) {
2354 $attary = sq_fixatts($tagname,
2355 $attary,
2356 $rm_attnames,
2357 $bad_attvals,
2358 $add_attr_to_tag,
2359 $message,
2360 $id,
2361 $mailbox
2362 );
2363 }
2364 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2365 $trusted .= $free_content;
2366 $trusted .= sq_tagprint($tagname, false, 2);
2367 }
2368 continue;
2369 }
2370 if ($skip_content == false){
2371 $trusted .= $free_content;
2372 }
2373 if ($tagname != FALSE){
2374 if ($tagtype == 2){
2375 if ($skip_content == $tagname){
2376 /**
2377 * Got to the end of tag we needed to remove.
2378 */
2379 $tagname = false;
2380 $skip_content = false;
2381 } else {
2382 if ($skip_content == false){
2383 if ($tagname == "body"){
2384 $tagname = "div";
2385 }
2386 if (isset($open_tags{$tagname}) &&
2387 $open_tags{$tagname} > 0){
2388 $open_tags{$tagname}--;
2389 } else {
2390 $tagname = false;
2391 }
2392 }
2393 }
2394 } else {
2395 /**
2396 * $rm_tags_with_content
2397 */
2398 if ($skip_content == false){
2399 /**
2400 * See if this is a self-closing type and change
2401 * tagtype appropriately.
2402 */
2403 if ($tagtype == 1
2404 && in_array($tagname, $self_closing_tags)){
2405 $tagtype = 3;
2406 }
2407 /**
2408 * See if we should skip this tag and any content
2409 * inside it.
2410 */
2411 if ($tagtype == 1 &&
2412 in_array($tagname, $rm_tags_with_content)){
2413 $skip_content = $tagname;
2414 } else {
2415 if (($rm_tags == false
2416 && in_array($tagname, $tag_list)) ||
2417 ($rm_tags == true &&
2418 !in_array($tagname, $tag_list))){
2419 $tagname = false;
2420 } else {
2421 /**
2422 * Convert body into div.
2423 */
2424 if ($tagname == "body"){
2425 $tagname = "div";
2426 $attary = sq_body2div($attary, $mailbox,
2427 $message, $id);
2428 }
2429 if ($tagtype == 1){
2430 if (isset($open_tags{$tagname})){
2431 $open_tags{$tagname}++;
2432 } else {
2433 $open_tags{$tagname}=1;
2434 }
2435 }
2436 /**
2437 * This is where we run other checks.
2438 */
2439 if (is_array($attary) && sizeof($attary) > 0){
2440 $attary = sq_fixatts($tagname,
2441 $attary,
2442 $rm_attnames,
2443 $bad_attvals,
2444 $add_attr_to_tag,
2445 $message,
2446 $id,
2447 $mailbox
2448 );
2449 }
2450 }
2451 }
2452 }
2453 }
2454 if ($tagname != false && $skip_content == false){
2455 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2456 }
2457 }
2458 $curpos = $gt+1;
2459 }
2460 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2461 if ($force_tag_closing == true){
2462 foreach ($open_tags as $tagname=>$opentimes){
2463 while ($opentimes > 0){
2464 $trusted .= '</' . $tagname . '>';
2465 $opentimes--;
2466 }
2467 }
2468 $trusted .= "\n";
2469 }
2470 $trusted .= "<!-- end sanitized html -->\n";
2471 return $trusted;
2472 }
2473
2474 /**
2475 * This is a wrapper function to call html sanitizing routines.
2476 *
2477 * @param $body the body of the message
2478 * @param $id the id of the message
2479
2480 * @param $message
2481 * @param $mailbox
2482 * @param boolean $take_mailto_links When TRUE, converts mailto: links
2483 * into internal SM compose links
2484 * (optional; default = TRUE)
2485 * @return a string with html safe to display in the browser.
2486 */
2487 function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2488
2489 // require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
2490
2491 global $attachment_common_show_images, $view_unsafe_images,
2492 $has_unsafe_images;
2493 /**
2494 * Don't display attached images in HTML mode.
2495 *
2496 * SB: why?
2497 */
2498 $attachment_common_show_images = false;
2499 $tag_list = Array(
2500 false,
2501 "object",
2502 "meta",
2503 "html",
2504 "head",
2505 "base",
2506 "link",
2507 "frame",
2508 "iframe",
2509 "plaintext",
2510 "marquee"
2511 );
2512
2513 $rm_tags_with_content = Array(
2514 "script",
2515 "applet",
2516 "embed",
2517 "title",
2518 "frameset",
2519 "xmp",
2520 "xml"
2521 );
2522
2523 $self_closing_tags = Array(
2524 "img",
2525 "br",
2526 "hr",
2527 "input",
2528 "outbind"
2529 );
2530
2531 $force_tag_closing = true;
2532
2533 $rm_attnames = Array(
2534 "/.*/" =>
2535 Array(
2536 "/target/i",
2537 "/^on.*/i",
2538 "/^dynsrc/i",
2539 "/^data.*/i",
2540 "/^lowsrc.*/i"
2541 )
2542 );
2543
2544 $secremoveimg = "../images/" . _("sec_remove_eng.png");
2545 $bad_attvals = Array(
2546 "/.*/" =>
2547 Array(
2548 "/^src|background/i" =>
2549 Array(
2550 Array(
2551 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2552 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2553 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2554 ),
2555 Array(
2556 "\\1$secremoveimg\\2",
2557 "\\1$secremoveimg\\2",
2558 "\\1$secremoveimg\\2",
2559 )
2560 ),
2561 "/^href|action/i" =>
2562 Array(
2563 Array(
2564 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2565 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2566 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2567 ),
2568 Array(
2569 "\\1#\\1",
2570 "\\1#\\1",
2571 "\\1#\\1"
2572 )
2573 ),
2574 "/^style/i" =>
2575 Array(
2576 Array(
2577 "/\/\*.*\*\//",
2578 "/expression/i",
2579 "/binding/i",
2580 "/behaviou*r/i",
2581 "/include-source/i",
2582
2583 // position:relative can also be exploited
2584 // to put content outside of email body area
2585 // and position:fixed is similarly exploitable
2586 // as position:absolute, so we'll remove it
2587 // altogether....
2588 //
2589 // Does this screw up legitimate HTML messages?
2590 // If so, the only fix I see is to allow position
2591 // attributes (any values? I think we still have
2592 // to block static and fixed) only if $use_iframe
2593 // is enabled (1.5.0+)
2594 //
2595 // was: "/position\s*:\s*absolute/i",
2596 //
2597 "/position\s*:/i",
2598
2599 "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
2600 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2601 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2602 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
2603 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
2604 ),
2605 Array(
2606 "",
2607 "idiocy",
2608 "idiocy",
2609 "idiocy",
2610 "idiocy",
2611 "idiocy",
2612 "url",
2613 "url(\\1#\\1)",
2614 "url(\\1#\\1)",
2615 "url(\\1#\\1)",
2616 "\\1:url(\\2#\\3)"
2617 )
2618 )
2619 )
2620 );
2621
2622 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
2623 // images off by default.
2624 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
2625
2626 if (!$view_unsafe_images){
2627 /**
2628 * Remove any references to http/https if view_unsafe_images set
2629 * to false.
2630 */
2631 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
2632 '/^([\'\"])\s*https*:.*([\'\"])/si');
2633 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
2634 "\\1$secremoveimg\\1");
2635 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
2636 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
2637 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
2638 "url(\\1$secremoveimg\\1)");
2639 }
2640
2641 $add_attr_to_tag = Array(
2642 "/^a$/i" =>
2643 Array('target'=>'"_blank"',
2644 'title'=>'"'._("This external link will open in a new window").'"'
2645 )
2646 );
2647 $trusted = sq_sanitize($body,
2648 $tag_list,
2649 $rm_tags_with_content,
2650 $self_closing_tags,
2651 $force_tag_closing,
2652 $rm_attnames,
2653 $bad_attvals,
2654 $add_attr_to_tag,
2655 $message,
2656 $id,
2657 $mailbox
2658 );
2659 if (strpos($trusted,$secremoveimg)){
2660 $has_unsafe_images = true;
2661 }
2662
2663 // we want to parse mailto's in HTML output, change to SM compose links
2664 // this is a modified version of code from url_parser.php... but Marc is
2665 // right: we need a better filtering implementation; adding this randomly
2666 // here is not a great solution
2667 //
2668 if ($take_mailto_links) {
2669 // parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
2670 global $MailTo_PReg_Match;
2671 $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
2672 if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2673 foreach ($regs[0] as $i => $mailto_before) {
2674 $mailto_params = $regs[10][$i];
2675 // get rid of any tailing quote since we have to add send_to to the end
2676 //
2677 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
2678 $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
2679 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
2680 $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
2681
2682 if ($regs[1][$i]) { //if there is an email addr before '?', we need to merge it with the params
2683 $to = 'to=' . $regs[1][$i];
2684 if (strpos($mailto_params, 'to=') > -1) //already a 'to='
2685 $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2686 else {
2687 if ($mailto_params) //already some params, append to them
2688 $mailto_params .= '&amp;' . $to;
2689 else
2690 $mailto_params .= '?' . $to;
2691 }
2692 }
2693
2694 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2695
2696 // we'll already have target=_blank, no need to allow comp_in_new
2697 // here (which would be a lot more work anyway)
2698 //
2699 global $compose_new_win;
2700 $temp_comp_in_new = $compose_new_win;
2701 $compose_new_win = 0;
2702 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2703 $compose_new_win = $temp_comp_in_new;
2704
2705 // remove <a href=" and anything after the next quote (we only
2706 // need the uri, not the link HTML) in compose uri
2707 //
2708 $comp_uri = substr($comp_uri, 9);
2709 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2710 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2711 }
2712 }
2713 }
2714
2715 return $trusted;
2716 }
2717
2718 /**
2719 * function SendDownloadHeaders - send file to the browser
2720 *
2721 * Original Source: SM core src/download.php
2722 * moved here to make it available to other code, and separate
2723 * front end from back end functionality.
2724 *
2725 * @param string $type0 first half of mime type
2726 * @param string $type1 second half of mime type
2727 * @param string $filename filename to tell the browser for downloaded file
2728 * @param boolean $force whether to force the download dialog to pop
2729 * @param optional integer $filesize send the Content-Header and length to the browser
2730 * @return void
2731 */
2732 function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2733 global $languages, $squirrelmail_language;
2734 $isIE = $isIE6plus = false;
2735
2736 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2737
2738 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
2739 strstr($HTTP_USER_AGENT, 'Opera') === false) {
2740 $isIE = true;
2741 }
2742
2743 if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2744 ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2745 $isIE6plus = true;
2746 }
2747
2748 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
2749 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
2750 $filename =
2751 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
2752 } else {
2753 $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&nbsp;', ' ', $filename));
2754 }
2755
2756 // A Pox on Microsoft and it's Internet Explorer!
2757 //
2758 // IE has lots of bugs with file downloads.
2759 // It also has problems with SSL. Both of these cause problems
2760 // for us in this function.
2761 //
2762 // See this article on Cache Control headers and SSL
2763 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2764 //
2765 // The best thing you can do for IE is to upgrade to the latest
2766 // version
2767 //set all the Cache Control Headers for IE
2768 if ($isIE) {
2769 $filename=rawurlencode($filename);
2770 header ("Pragma: public");
2771 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
2772 header ("Cache-Control: post-check=0, pre-check=0", false);
2773 header ("Cache-Control: private");
2774
2775 //set the inline header for IE, we'll add the attachment header later if we need it
2776 header ("Content-Disposition: inline; filename=$filename");
2777 }
2778
2779 if (!$force) {
2780 // Try to show in browser window
2781 header ("Content-Disposition: inline; filename=\"$filename\"");
2782 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2783 } else {
2784 // Try to pop up the "save as" box
2785
2786 // IE makes this hard. It pops up 2 save boxes, or none.
2787 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2788 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2789 // But, according to Microsoft, it is "RFC compliant but doesn't
2790 // take into account some deviations that allowed within the
2791 // specification." Doesn't that mean RFC non-compliant?
2792 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2793
2794 // all browsers need the application/octet-stream header for this
2795 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2796
2797 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2798 // Do not have quotes around filename, but that applied to
2799 // "attachment"... does it apply to inline too?
2800 header ("Content-Disposition: attachment; filename=\"$filename\"");
2801
2802 if ($isIE && !$isIE6plus) {
2803 // This combination seems to work mostly. IE 5.5 SP 1 has
2804 // known issues (see the Microsoft Knowledge Base)
2805
2806 // This works for most types, but doesn't work with Word files
2807 header ("Content-Type: application/download; name=\"$filename\"");
2808 header ("Content-Type: application/force-download; name=\"$filename\"");
2809 // These are spares, just in case. :-)
2810 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2811 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2812 //header("Content-Type: application/octet-stream; name=\"$filename\"");
2813 } else if ($isIE) {
2814 // This is to prevent IE for MIME sniffing and auto open a file in IE
2815 header ("Content-Type: application/force-download; name=\"$filename\"");
2816 } else {
2817 // another application/octet-stream forces download for Netscape
2818 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2819 }
2820 }
2821
2822 //send the content-length header if the calling function provides it
2823 if ($filesize > 0) {
2824 header("Content-Length: $filesize");
2825 }
2826
2827 } // end fn SendDownloadHeaders