3227aebb3caa292df10f7945ae285109b9e72a33
[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 1999-2017 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 $errormessage .= '<pre>' . sm_encode_html_special_chars($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 .*BODY.*/i', $topline)) ;
141 // Matching with "BODY" above is difficult: in most cases "FETCH \(BODY" would work
142 // but some servers may put other things in the same result, perhaps something such
143 // as "* 23 FETCH (FLAGS (\Seen) BODY[1] {174}". There is some small chance that
144 // if the character sequence "BODY" appears in a response where it isn't actually
145 // a FETCH response data item name, the current regex will break things. The better
146 // way to do this would be to parse the response correctly and not use a regex.
147
148 $wholemessage = implode('', $data);
149 if (preg_match('/\{([^\}]*)\}/', $topline, $regs)) {
150 $ret = substr($wholemessage, 0, $regs[1]);
151 /* There is some information in the content info header that could be important
152 * in order to parse html messages. Let's get them here.
153 */
154 // if ($ret{0} == '<') {
155 // $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, TRUE);
156 // }
157 } else if (preg_match('/"([^"]*)"/', $topline, $regs)) {
158 $ret = $regs[1];
159 } else if ((stristr($topline, 'nil') !== false) && (empty($wholemessage))) {
160 $ret = $wholemessage;
161 } else {
162 global $where, $what, $mailbox, $passed_id, $startMessage;
163 $par = 'mailbox=' . urlencode($mailbox) . '&amp;passed_id=' . $passed_id;
164 if (isset($where) && isset($what)) {
165 $par .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
166 } else {
167 $par .= '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
168 }
169 $par .= '&amp;response=' . urlencode($response) .
170 '&amp;message=' . urlencode($message) .
171 '&amp;topline=' . urlencode($topline);
172
173 echo '<tt><br />' .
174 '<table width="80%"><tr>' .
175 '<tr><td colspan="2">' .
176 _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
177 '</td></tr>' .
178 '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
179 '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
180 '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
181 '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
182 "</table><br /></tt></font><hr />";
183
184 $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, TRUE);
185 array_shift($data);
186 $wholemessage = implode('', $data);
187
188 $ret = $wholemessage;
189 }
190 return $ret;
191 }
192
193 function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding, $rStream='php://stdout', $force_crlf='') {
194
195 /* Don't kill the connection if the browser is over a dialup
196 * and it would take over 30 seconds to download it.
197 * Don't call set_time_limit in safe mode.
198 */
199
200 if (!ini_get('safe_mode')) {
201 set_time_limit(0);
202 }
203 /* in case of base64 encoded attachments, do not buffer them.
204 Instead, echo the decoded attachment directly to screen */
205 if (strtolower($encoding) == 'base64') {
206 if (!$ent_id) {
207 $query = "FETCH $id BODY[]";
208 } else {
209 $query = "FETCH $id BODY[$ent_id]";
210 }
211 sqimap_run_command($imap_stream,$query,true,$response,$message,TRUE,'sqimap_base64_decode',$rStream,true);
212 } else {
213 $body = mime_fetch_body ($imap_stream, $id, $ent_id);
214 if (is_resource($rStream)) {
215 fputs($rStream,decodeBody($body, $encoding, $force_crlf));
216 } else {
217 echo decodeBody($body, $encoding, $force_crlf);
218 }
219 }
220
221 /*
222 TODO, use the same method for quoted printable.
223 However, I assume that quoted printable attachments aren't that large
224 so the performancegain / memory usage drop will be minimal.
225 If we decide to add that then we need to adapt sqimap_fread because
226 we need to split te result on \n and fread doesn't stop at \n. That
227 means we also should provide $results from sqimap_fread (by ref) to
228 te function and set $no_return to false. The $filter function for
229 quoted printable should handle unsetting of $results.
230 */
231 /*
232 TODO 2: find out how we write to the output stream php://stdout. fwrite
233 doesn't work because 'php://stdout isn't a stream.
234 */
235
236 return;
237 }
238
239 /* -[ END MIME DECODING ]----------------------------------------------------------- */
240
241 /* This is here for debugging purposes. It will print out a list
242 * of all the entity IDs that are in the $message object.
243 */
244 function listEntities ($message) {
245 if ($message) {
246 echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br />';
247 for ($i = 0; isset($message->entities[$i]); $i++) {
248 echo "$i : ";
249 $msg = listEntities($message->entities[$i]);
250
251 if ($msg) {
252 echo "return: ";
253 return $msg;
254 }
255 }
256 }
257 }
258
259 function getPriorityStr($priority) {
260 $priority_level = substr($priority,0,1);
261
262 switch($priority_level) {
263 /* Check for a higher then normal priority. */
264 case '1':
265 case '2':
266 $priority_string = _("High");
267 break;
268
269 /* Check for a lower then normal priority. */
270 case '4':
271 case '5':
272 $priority_string = _("Low");
273 break;
274
275 /* Check for a normal priority. */
276 case '3':
277 default:
278 $priority_level = '3';
279 $priority_string = _("Normal");
280 break;
281
282 }
283 return $priority_string;
284 }
285
286 /* returns a $message object for a particular entity id */
287 function getEntity ($message, $ent_id) {
288 return $message->getEntity($ent_id);
289 }
290
291 /* translateText
292 * Extracted from strings.php 23/03/2002
293 */
294
295 function translateText(&$body, $wrap_at, $charset) {
296 global $where, $what; /* from searching */
297 global $color; /* color theme */
298
299 // require_once(SM_PATH . 'functions/url_parser.php');
300
301 $body_ary = explode("\n", $body);
302 for ($i=0; $i < count($body_ary); $i++) {
303 $line = rtrim($body_ary[$i],"\r");
304
305 if (strlen($line) - 2 >= $wrap_at) {
306 sqWordWrap($line, $wrap_at, $charset);
307 }
308 $line = charset_decode($charset, $line);
309 $line = str_replace("\t", ' ', $line);
310
311 parseUrl ($line);
312
313 $quotes = 0;
314 $pos = 0;
315 $j = strlen($line);
316
317 while ($pos < $j) {
318 if ($line[$pos] == ' ') {
319 $pos++;
320 } else if (strpos($line, '&gt;', $pos) === $pos) {
321 $pos += 4;
322 $quotes++;
323 } else {
324 break;
325 }
326 }
327
328 if ($quotes % 2) {
329 $line = '<span class="quote1">' . $line . '</span>';
330 } elseif ($quotes) {
331 $line = '<span class="quote2">' . $line . '</span>';
332 }
333
334 $body_ary[$i] = $line;
335 }
336 $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
337 }
338
339 /**
340 * This returns a parsed string called $body. That string can then
341 * be displayed as the actual message in the HTML. It contains
342 * everything needed, including HTML Tags, Attachments at the
343 * bottom, etc.
344 *
345 * Since 1.2.0 function uses message_body hook.
346 * Till 1.3.0 function included output of formatAttachments().
347 *
348 * @param resource $imap_stream imap connection resource
349 * @param object $message squirrelmail message object
350 * @param array $color squirrelmail color theme array
351 * @param integer $wrap_at number of characters per line
352 * @param string $ent_num (since 1.3.0) message part id
353 * @param integer $id (since 1.3.0) message id
354 * @param string $mailbox (since 1.3.0) imap folder name
355 * @return string html formated message text
356 */
357 function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX') {
358 /* This if statement checks for the entity to show as the
359 * primary message. To add more of them, just put them in the
360 * order that is their priority.
361 */
362 global $startMessage, $languages, $squirrelmail_language,
363 $show_html_default, $sort, $has_unsafe_images, $passed_ent_id,
364 $use_iframe, $iframe_height, $download_and_unsafe_link,
365 $download_href, $unsafe_image_toggle_href, $unsafe_image_toggle_text,
366 $oTemplate, $nbsp;
367
368 // workaround for not updated config.php
369 if (! isset($use_iframe)) $use_iframe = false;
370
371 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
372 // images off by default.
373 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
374
375 $body = '';
376 $urlmailbox = urlencode($mailbox);
377 $body_message = getEntity($message, $ent_num);
378 if (($body_message->header->type0 == 'text') ||
379 ($body_message->header->type0 == 'rfc822')) {
380 $body = mime_fetch_body ($imap_stream, $id, $ent_num);
381 $body = decodeBody($body, $body_message->header->encoding);
382
383 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
384 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode')) {
385 if (mb_detect_encoding($body) != 'ASCII') {
386 $body = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode',$body);
387 }
388 }
389
390 /* As of 1.5.2, $body is passed (and modified) by reference */
391 do_hook('message_body', $body);
392
393 /* If there are other types that shouldn't be formatted, add
394 * them here.
395 */
396
397 if ($body_message->header->type1 == 'html') {
398 if ($show_html_default <> 1) {
399 $entity_conv = array('&nbsp;' => ' ',
400 '<p>' => "\n",
401 '<P>' => "\n",
402 '<br>' => "\n",
403 '<BR>' => "\n",
404 '<br />' => "\n",
405 '<BR />' => "\n",
406 '&gt;' => '>',
407 '&lt;' => '<');
408 $body = strtr($body, $entity_conv);
409 $body = strip_tags($body);
410 $body = trim($body);
411 translateText($body, $wrap_at,
412 $body_message->header->getParameter('charset'));
413 } elseif ($use_iframe) {
414 /**
415 * If we don't add html message between iframe tags,
416 * we must detect unsafe images and modify $has_unsafe_images.
417 */
418 $html_body = magicHTML($body, $id, $message, $mailbox);
419 // Convert character set in order to display html mails in different character set
420 $html_body = charset_decode($body_message->header->getParameter('charset'),$html_body,false,true);
421
422 // creating iframe url
423 $iframeurl=sqm_baseuri().'src/view_html.php?'
424 . 'mailbox=' . $urlmailbox
425 . '&amp;passed_id=' . $id
426 . '&amp;ent_id=' . $ent_num
427 . '&amp;view_unsafe_images=' . (int) $view_unsafe_images;
428
429 global $oTemplate;
430 $oTemplate->assign('iframe_url', $iframeurl);
431 $oTemplate->assign('iframe_height', $iframe_height);
432 $oTemplate->assign('html_body', $html_body);
433
434 $body = $oTemplate->fetch('read_html_iframe.tpl');
435 } else {
436 // old way of html rendering
437 /**
438 * convert character set. charset_decode does not remove html special chars
439 * applied by magicHTML functions and does not sanitize them second time if
440 * fourth argument is true.
441 */
442 $charset = $body_message->header->getParameter('charset');
443 if (!empty($charset)) {
444 $body = charset_decode($charset,$body,false,true);
445 }
446 $body = magicHTML($body, $id, $message, $mailbox);
447 }
448 } else {
449 translateText($body, $wrap_at,
450 $body_message->header->getParameter('charset'));
451 }
452
453 /*
454 * Previously the links for downloading and unsafe images were printed
455 * under the mail. By putting the links in a global variable we can
456 * print it in the toolbar where it belongs. Since the original code was
457 * in this place it's left here. It might be possible to move it to some
458 * other place if that makes sense. The possibility to do so has not
459 * been evaluated yet.
460 */
461
462 // Initialize the global variable to an empty string.
463 // 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.
464 $download_and_unsafe_link = '';
465
466 // Prepare and build a link for downloading the mail.
467 $link = 'passed_id=' . $id . '&amp;ent_id='.$ent_num.
468 '&amp;mailbox=' . $urlmailbox .'&amp;sort=' . $sort .
469 '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
470 if (isset($passed_ent_id)) {
471 $link .= '&amp;passed_ent_id='.$passed_ent_id;
472 }
473 $download_href = SM_PATH . 'src/download.php?absolute_dl=true&amp;' . $link;
474
475 // Always add the link for downloading the mail as a file to the global
476 // variable.
477 $download_and_unsafe_link .= "$nbsp|$nbsp"
478 . create_hyperlink($download_href, _("Download this as a file"));
479
480 // Find out the right text to use in the link depending on the
481 // circumstances. If the unsafe images are displayed the link should
482 // hide them, if they aren't displayed the link should only appear if
483 // the mail really contains unsafe images.
484 if ($view_unsafe_images) {
485 $text = _("Hide Unsafe Images");
486 } else {
487 if (isset($has_unsafe_images) && $has_unsafe_images) {
488 $link .= '&amp;view_unsafe_images=1';
489 $text = _("View Unsafe Images");
490 } else {
491 $text = '';
492 }
493 }
494
495 // Only create a link for unsafe images if there's need for one. If so:
496 // add it to the global variable.
497 if($text != '') {
498 $unsafe_image_toggle_href = SM_PATH . 'src/read_body.php?'.$link;
499 $unsafe_image_toggle_text = $text;
500 $download_and_unsafe_link .= "$nbsp|$nbsp"
501 . create_hyperlink($unsafe_image_toggle_href, $text);
502 }
503 }
504 return $body;
505 }
506
507 /**
508 * Generate attachments array for passing to templates.
509 *
510 * @since 1.5.2
511 * @param object $message SquirrelMail message object
512 * @param array $exclude_id message parts that are not attachments.
513 * @param string $mailbox mailbox name
514 * @param integer $id message id
515 */
516 function buildAttachmentArray($message, $exclude_id, $mailbox, $id) {
517 global $where, $what, $startMessage, $color, $passed_ent_id, $base_uri;
518
519 $att_ar = $message->getAttachments($exclude_id);
520 $urlMailbox = urlencode($mailbox);
521
522 $attachments = array();
523 foreach ($att_ar as $att) {
524 $ent = $att->entity_id;
525 $header = $att->header;
526 $type0 = strtolower($header->type0);
527 $type1 = strtolower($header->type1);
528 $name = '';
529 $links = array();
530 $links['download link']['text'] = _("Download");
531 $links['download link']['href'] = $base_uri .
532 "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
533
534 if ($type0 =='message' && $type1 == 'rfc822') {
535 $default_page = $base_uri . 'src/read_body.php';
536 $rfc822_header = $att->rfc822_header;
537 $filename = $rfc822_header->subject;
538 if (trim( $filename ) == '') {
539 $filename = 'untitled-[' . $ent . ']' ;
540 }
541 $from_o = $rfc822_header->from;
542 if (is_object($from_o)) {
543 $from_name = decodeHeader($from_o->getAddress(false));
544 } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
545 // something weird happens when a digest message is opened and you return to the digest
546 // now the from object is part of an array. Probably the parseHeader call overwrites the info
547 // retrieved from the bodystructure in a different way. We need to fix this later.
548 // possible starting point, do not fetch header we already have and inspect how
549 // the rfc822_header object behaves.
550 $from_name = decodeHeader($from_o[0]->getAddress(false));
551 } else {
552 $from_name = _("Unknown sender");
553 }
554 $description = _("From").': '.$from_name;
555 } else {
556 $default_page = $base_uri . 'src/download.php';
557 $filename = $att->getFilename();
558 if ($header->description) {
559 $description = decodeHeader($header->description);
560 } else {
561 $description = '';
562 }
563 }
564
565 $display_filename = $filename;
566 if (isset($passed_ent_id)) {
567 $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
568 } else {
569 $passed_ent_id_link = '';
570 }
571 $defaultlink = $default_page . "?startMessage=$startMessage"
572 . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
573 . '&amp;ent_id='.$ent.$passed_ent_id_link;
574 if ($where && $what) {
575 $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
576 }
577 // IE does make use of mime content sniffing. Forcing a download
578 // prohibit execution of XSS inside an application/octet-stream attachment
579 if ($type0 == 'application' && $type1 == 'octet-stream') {
580 $defaultlink .= '&amp;absolute_dl=true';
581 }
582
583 /* This executes the attachment hook with a specific MIME-type.
584 * It also allows plugins to run if there's a rule for a more
585 * generic type. Finally, a hook for ALL attachment types is
586 * run as well.
587 */
588 // First remember the default link.
589 $defaultlink_orig = $defaultlink;
590
591 /* The API for this hook has changed as of 1.5.2 so that all plugin
592 arguments are passed in an array instead of each their own plugin
593 argument, and arguments are passed by reference, so instead of
594 returning any changes, changes should simply be made to the original
595 arguments themselves. */
596 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
597 &$defaultlink, &$display_filename, &$where, &$what);
598 do_hook("attachment $type0/$type1", $temp);
599 /* The API for this hook has changed as of 1.5.2 so that all plugin
600 arguments are passed in an array instead of each their own plugin
601 argument, and arguments are passed by reference, so instead of
602 returning any changes, changes should simply be made to the original
603 arguments themselves. */
604 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
605 &$defaultlink, &$display_filename, &$where, &$what);
606 // Do not let a generic plugin change the default link if a more
607 // specialized one already did it...
608 if ($defaultlink != $defaultlink_orig) {
609 $dummy = '';
610 $temp[5] = &$dummy;
611 }
612 do_hook("attachment $type0/*", $temp);
613 /* The API for this hook has changed as of 1.5.2 so that all plugin
614 arguments are passed in an array instead of each their own plugin
615 argument, and arguments are passed by reference, so instead of
616 returning any changes, changes should simply be made to the original
617 arguments themselves. */
618 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
619 &$defaultlink, &$display_filename, &$where, &$what);
620 // Do not let a generic plugin change the default link if a more
621 // specialized one already did it...
622 if ($defaultlink != $defaultlink_orig) {
623 $dummy = '';
624 $temp[5] = &$dummy;
625 }
626 do_hook("attachment */*", $temp);
627
628 $this_attachment = array();
629 $this_attachment['Name'] = decodeHeader($display_filename);
630 $this_attachment['Description'] = $description;
631 $this_attachment['DefaultHREF'] = $defaultlink;
632 $this_attachment['DownloadHREF'] = $links['download link']['href'];
633 $this_attachment['ViewHREF'] = isset($links['attachment_common']) ? $links['attachment_common']['href'] : '';
634 $this_attachment['Size'] = $header->size;
635 $this_attachment['ContentType'] = sm_encode_html_special_chars($type0 .'/'. $type1);
636 $this_attachment['OtherLinks'] = array();
637 foreach ($links as $val) {
638 if ($val['text']==_("Download") || $val['text'] == _("View"))
639 continue;
640 if (empty($val['text']) && empty($val['extra']))
641 continue;
642
643 $temp = array();
644 $temp['HREF'] = $val['href'];
645 $temp['Text'] = (empty($val['text']) ? '' : $val['text']) . (empty($val['extra']) ? '' : $val['extra']);
646 $this_attachment['OtherLinks'][] = $temp;
647 }
648 $attachments[] = $this_attachment;
649
650 unset($links);
651 }
652
653 return $attachments;
654 }
655
656 /**
657 * Displays attachment links and information
658 *
659 * Since 1.3.0 function is not included in formatBody() call.
660 *
661 * Since 1.0.2 uses attachment $type0/$type1 hook.
662 * Since 1.2.5 uses attachment $type0/* hook.
663 * Since 1.5.0 uses attachments_bottom hook.
664 * Since 1.5.2 uses templates and does *not* return a value.
665 *
666 * @param object $message SquirrelMail message object
667 * @param array $exclude_id message parts that are not attachments.
668 * @param string $mailbox mailbox name
669 * @param integer $id message id
670 */
671 function formatAttachments($message, $exclude_id, $mailbox, $id) {
672 global $oTemplate;
673
674 $attach = buildAttachmentArray($message, $exclude_id, $mailbox, $id);
675
676 $oTemplate->assign('attachments', $attach);
677 $oTemplate->display('read_attachments.tpl');
678 }
679
680 function sqimap_base64_decode(&$string) {
681
682 // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
683 // fly decoding (to reduce memory usage) you have to check if the
684 // data has incomplete pairs
685
686 // Remove the noise in order to check if the 4 bytes pairs are complete
687 $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
688
689 $sStringRem = '';
690 $iMod = strlen($string) % 4;
691 if ($iMod) {
692 $sStringRem = substr($string,-$iMod);
693 // Check if $sStringRem contains padding characters
694 if (substr($sStringRem,-1) != '=') {
695 $string = substr($string,0,-$iMod);
696 } else {
697 $sStringRem = '';
698 }
699 }
700 $string = base64_decode($string);
701 return $sStringRem;
702 }
703
704 /**
705 * Decodes encoded string (usually message body)
706 *
707 * This function decodes a string (usually the message body)
708 * depending on the encoding type. Currently quoted-printable
709 * and base64 encodings are supported.
710 *
711 * The decode_body hook was added to this function in 1.4.2/1.5.0.
712 * The $force_crlf parameter was added in 1.5.2.
713 *
714 * @param string $string The encoded string
715 * @param string $encoding used encoding
716 * @param string $force_crlf Whether or not to force CRLF or LF
717 * line endings (or to leave as is).
718 * If given as "LF", line endings will
719 * all be converted to LF; if "CRLF",
720 * line endings will all be converted
721 * to CRLF. If given as an empty value,
722 * the global $force_crlf_default will
723 * be consulted (it can be specified in
724 * config/config_local.php). Otherwise,
725 * any other value will cause the string
726 * to be left alone. Note that this will
727 * be overridden to "LF" if not using at
728 * least PHP version 4.3.0. (OPTIONAL;
729 * default is empty - consult global
730 * default value)
731 *
732 * @return string The decoded string
733 *
734 * @since 1.0
735 *
736 */
737 function decodeBody($string, $encoding, $force_crlf='') {
738
739 global $force_crlf_default;
740 if (empty($force_crlf)) $force_crlf = $force_crlf_default;
741 $force_crlf = strtoupper($force_crlf);
742
743 // must force line endings to LF due to broken
744 // quoted_printable_decode() in PHP versions
745 // before 4.3.0 (see below)
746 //
747 if (!check_php_version(4, 3, 0) || $force_crlf == 'LF')
748 $string = str_replace("\r\n", "\n", $string);
749 else if ($force_crlf == 'CRLF')
750 $string = str_replace("\n", "\r\n", $string);
751
752 $encoding = strtolower($encoding);
753
754 $encoding_handler = do_hook('decode_body', $encoding);
755
756
757 // plugins get first shot at decoding the string
758 //
759 if (!empty($encoding_handler) && function_exists($encoding_handler)) {
760 $string = $encoding_handler('decode', $string);
761
762 } elseif ($encoding == 'quoted-printable' ||
763 $encoding == 'quoted_printable') {
764
765 // quoted_printable_decode() function is broken in older
766 // php versions. Text with \r\n decoding was fixed only
767 // in php 4.3.0. Minimal code requirement is PHP 4.0.4+
768 // and the above call to: str_replace("\r\n", "\n", $string);
769 //
770 $string = quoted_printable_decode($string);
771
772 } elseif ($encoding == 'base64') {
773 $string = base64_decode($string);
774 }
775
776 // All other encodings are returned raw.
777 return $string;
778 }
779
780 /**
781 * Decodes headers
782 *
783 * This function decodes strings that are encoded according to
784 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
785 * Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
786 *
787 * @param string $string header string that has to be made readable
788 * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
789 * @param boolean $htmlsafe preserve spaces and sanitize html special characters. defaults to true
790 * @param boolean $decide decide if string can be utfencoded. defaults to false
791 * @return string decoded header string
792 */
793 function decodeHeader ($string, $utfencode=true,$htmlsafe=true,$decide=false) {
794 global $languages, $squirrelmail_language,$default_charset;
795 if (is_array($string)) {
796 $string = implode("\n", $string);
797 }
798
799 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
800 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
801 $string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
802 // Do we need to return at this point?
803 // return $string;
804 }
805 $i = 0;
806 $iLastMatch = -2;
807 $encoded = true;
808
809 // FIXME: spaces are allowed inside quoted-printable encoding, but the following line will bust up any such encoded strings
810 $aString = explode(' ',$string);
811 $ret = '';
812 foreach ($aString as $chunk) {
813 if ($encoded && $chunk === '') {
814 continue;
815 } elseif ($chunk === '') {
816 $ret .= ' ';
817 continue;
818 }
819 $encoded = false;
820 /* if encoded words are not separated by a linear-space-white we still catch them */
821 $j = $i-1;
822
823 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
824 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
825 if ($iLastMatch !== $j) {
826 if ($htmlsafe) {
827 $ret .= '&#32;';
828 } else {
829 $ret .= ' ';
830 }
831 }
832 $iLastMatch = $i;
833 $j = $i;
834 if ($htmlsafe) {
835 $ret .= sm_encode_html_special_chars($res[1]);
836 } else {
837 $ret .= $res[1];
838 }
839 $encoding = ucfirst($res[3]);
840
841 /* decide about valid decoding */
842 if ($decide && is_conversion_safe($res[2])) {
843 $utfencode=true;
844 $can_be_encoded=true;
845 } else {
846 $can_be_encoded=false;
847 }
848 switch ($encoding)
849 {
850 case 'B':
851 $replace = base64_decode($res[4]);
852 if ($utfencode) {
853 if ($can_be_encoded) {
854 /* convert string to different charset,
855 * if functions asks for it (usually in compose)
856 */
857 $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
858 } else {
859 // convert string to html codes in order to display it
860 $ret .= charset_decode($res[2],$replace);
861 }
862 } else {
863 if ($htmlsafe) {
864 $replace = sm_encode_html_special_chars($replace);
865 }
866 $ret.= $replace;
867 }
868 break;
869 case 'Q':
870 $replace = str_replace('_', ' ', $res[4]);
871 $replace = preg_replace_callback('/=([0-9a-f]{2})/i',
872 create_function ('$matches', 'return chr(hexdec($matches[1]));'),
873 $replace);
874 if ($utfencode) {
875 if ($can_be_encoded) {
876 /* convert string to different charset,
877 * if functions asks for it (usually in compose)
878 */
879 $replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
880 } else {
881 // convert string to html codes in order to display it
882 $replace = charset_decode($res[2], $replace);
883 }
884 } else {
885 if ($htmlsafe) {
886 $replace = sm_encode_html_special_chars($replace);
887 }
888 }
889 $ret .= $replace;
890 break;
891 default:
892 break;
893 }
894 $chunk = $res[5];
895 $encoded = true;
896 }
897 if (!$encoded) {
898 if ($htmlsafe) {
899 $ret .= '&#32;';
900 } else {
901 $ret .= ' ';
902 }
903 }
904
905 if (!$encoded && $htmlsafe) {
906 $ret .= sm_encode_html_special_chars($chunk);
907 } else {
908 $ret .= $chunk;
909 }
910 ++$i;
911 }
912 /* remove the first added space */
913 if ($ret) {
914 if ($htmlsafe) {
915 $ret = substr($ret,5);
916 } else {
917 $ret = substr($ret,1);
918 }
919 }
920
921 return $ret;
922 }
923
924 /**
925 * Encodes header
926 *
927 * Function uses XTRA_CODE _encodeheader function, if such function exists.
928 *
929 * Function uses Q encoding by default and encodes a string according to RFC
930 * 1522 for use in headers if it contains 8-bit characters or anything that
931 * looks like it should be encoded.
932 *
933 * Function switches to B encoding and encodeHeaderBase64() function, if
934 * string is 8bit and multibyte character set supported by mbstring extension
935 * is used. It can cause E_USER_NOTICE errors, if interface is used with
936 * multibyte character set unsupported by mbstring extension.
937 *
938 * @param string $string header string, that has to be encoded
939 * @return string quoted-printable encoded string
940 * @todo make $mb_charsets system wide constant
941 */
942 function encodeHeader ($string) {
943 global $default_charset, $languages, $squirrelmail_language;
944
945 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
946 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
947 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
948 }
949
950 // Use B encoding for multibyte charsets
951 $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
952 if (in_array($default_charset,$mb_charsets) &&
953 in_array($default_charset,sq_mb_list_encodings()) &&
954 sq_is8bit($string)) {
955 return encodeHeaderBase64($string,$default_charset);
956 } elseif (in_array($default_charset,$mb_charsets) &&
957 sq_is8bit($string) &&
958 ! in_array($default_charset,sq_mb_list_encodings())) {
959 // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
960 // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
961 }
962
963 // Encode only if the string contains 8-bit characters or =?
964 $j = strlen($string);
965 $max_l = 75 - strlen($default_charset) - 7;
966 $aRet = array();
967 $ret = '';
968 $iEncStart = $enc_init = false;
969 $cur_l = $iOffset = 0;
970 for($i = 0; $i < $j; ++$i) {
971 switch($string{$i})
972 {
973 case '"':
974 case '=':
975 case '<':
976 case '>':
977 case ',':
978 case '?':
979 case '_':
980 if ($iEncStart === false) {
981 $iEncStart = $i;
982 }
983 $cur_l+=3;
984 if ($cur_l > ($max_l-2)) {
985 /* if there is an stringpart that doesn't need encoding, add it */
986 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
987 $aRet[] = "=?$default_charset?Q?$ret?=";
988 $iOffset = $i;
989 $cur_l = 0;
990 $ret = '';
991 $iEncStart = false;
992 } else {
993 $ret .= sprintf("=%02X",ord($string{$i}));
994 }
995 break;
996 case '(':
997 case ')':
998 if ($iEncStart !== false) {
999 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1000 $aRet[] = "=?$default_charset?Q?$ret?=";
1001 $iOffset = $i;
1002 $cur_l = 0;
1003 $ret = '';
1004 $iEncStart = false;
1005 }
1006 break;
1007 case ' ':
1008 if ($iEncStart !== false) {
1009 $cur_l++;
1010 if ($cur_l > $max_l) {
1011 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1012 $aRet[] = "=?$default_charset?Q?$ret?=";
1013 $iOffset = $i;
1014 $cur_l = 0;
1015 $ret = '';
1016 $iEncStart = false;
1017 } else {
1018 $ret .= '_';
1019 }
1020 }
1021 break;
1022 default:
1023 $k = ord($string{$i});
1024 if ($k > 126) {
1025 if ($iEncStart === false) {
1026 // do not start encoding in the middle of a string, also take the rest of the word.
1027 $sLeadString = substr($string,0,$i);
1028 $aLeadString = explode(' ',$sLeadString);
1029 $sToBeEncoded = array_pop($aLeadString);
1030 $iEncStart = $i - strlen($sToBeEncoded);
1031 $ret .= $sToBeEncoded;
1032 $cur_l += strlen($sToBeEncoded);
1033 }
1034 $cur_l += 3;
1035 /* first we add the encoded string that reached it's max size */
1036 if ($cur_l > ($max_l-2)) {
1037 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1038 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
1039 $cur_l = 3;
1040 $ret = '';
1041 $iOffset = $i;
1042 $iEncStart = $i;
1043 }
1044 $enc_init = true;
1045 $ret .= sprintf("=%02X", $k);
1046 } else {
1047 if ($iEncStart !== false) {
1048 $cur_l++;
1049 if ($cur_l > $max_l) {
1050 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1051 $aRet[] = "=?$default_charset?Q?$ret?=";
1052 $iEncStart = false;
1053 $iOffset = $i;
1054 $cur_l = 0;
1055 $ret = '';
1056 } else {
1057 $ret .= $string{$i};
1058 }
1059 }
1060 }
1061 break;
1062 }
1063 }
1064
1065 if ($enc_init) {
1066 if ($iEncStart !== false) {
1067 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1068 $aRet[] = "=?$default_charset?Q?$ret?=";
1069 } else {
1070 $aRet[] = substr($string,$iOffset);
1071 }
1072 $string = implode('',$aRet);
1073 }
1074 return $string;
1075 }
1076
1077 /**
1078 * Encodes string according to rfc2047 B encoding header formating rules
1079 *
1080 * It is recommended way to encode headers with character sets that store
1081 * symbols in more than one byte.
1082 *
1083 * Function requires mbstring support. If required mbstring functions are missing,
1084 * function returns false and sets E_USER_WARNING level error message.
1085 *
1086 * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1087 * that mbstring functions will generate E_WARNING errors, if unsupported
1088 * character set is used. mb_encode_mimeheader function provided by php
1089 * mbstring extension is not used in order to get better control of header
1090 * encoding.
1091 *
1092 * Used php code functions - function_exists(), trigger_error(), strlen()
1093 * (is used with charset names and base64 strings). Used php mbstring
1094 * functions - mb_strlen and mb_substr.
1095 *
1096 * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
1097 * encoding), rfc 2822 (header folding)
1098 *
1099 * @param string $string header string that must be encoded
1100 * @param string $charset character set. Must be supported by mbstring extension.
1101 * Use sq_mb_list_encodings() to detect supported charsets.
1102 * @return string string encoded according to rfc2047 B encoding formating rules
1103 * @since 1.5.1
1104 * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1105 * @todo Do we want to control max length of header?
1106 * @todo Do we want to control EOL (end-of-line) marker?
1107 * @todo Do we want to translate error message?
1108 */
1109 function encodeHeaderBase64($string,$charset) {
1110 /**
1111 * Check mbstring function requirements.
1112 */
1113 if (! function_exists('mb_strlen') ||
1114 ! function_exists('mb_substr')) {
1115 // set E_USER_WARNING
1116 trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1117 // return false
1118 return false;
1119 }
1120
1121 // initial return array
1122 $aRet = array();
1123
1124 /**
1125 * header length = 75 symbols max (same as in encodeHeader)
1126 * remove $charset length
1127 * remove =? ? ?= (5 chars)
1128 * remove 2 more chars (\r\n ?)
1129 */
1130 $iMaxLength = 75 - strlen($charset) - 7;
1131
1132 // set first character position
1133 $iStartCharNum = 0;
1134
1135 // loop through all characters. count characters and not bytes.
1136 for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1137 // encode string from starting character to current character.
1138 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1139
1140 // Check encoded string length
1141 if(strlen($encoded_string)>$iMaxLength) {
1142 // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1143 $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1144
1145 // set new starting character
1146 $iStartCharNum = $iCharNum-1;
1147
1148 // encode last char (in case it is last character in string)
1149 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1150 } // if string is shorter than max length - add next character
1151 }
1152
1153 // add last encoded string to array
1154 $aRet[] = $encoded_string;
1155
1156 // set initial return string
1157 $sRet = '';
1158
1159 // loop through encoded strings
1160 foreach($aRet as $string) {
1161 // TODO: Do we want to control EOL (end-of-line) marker
1162 if ($sRet!='') $sRet.= " ";
1163
1164 // add header tags and encoded string to return string
1165 $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1166 }
1167
1168 return $sRet;
1169 }
1170
1171 /* This function trys to locate the entity_id of a specific mime element */
1172 function find_ent_id($id, $message) {
1173 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1174 if ($message->entities[$i]->header->type0 == 'multipart') {
1175 $ret = find_ent_id($id, $message->entities[$i]);
1176 } else {
1177 if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
1178 // if (sq_check_save_extension($message->entities[$i])) {
1179 return $message->entities[$i]->entity_id;
1180 // }
1181 } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1182 /**
1183 * This is part of a fix for Outlook Express 6.x generating
1184 * cid URLs without creating content-id headers
1185 * @@JA - 20050207
1186 */
1187 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1188 return $message->entities[$i]->entity_id;
1189 }
1190 }
1191 }
1192 }
1193 return $ret;
1194 }
1195
1196 function sq_check_save_extension($message) {
1197 $filename = $message->getFilename();
1198 $ext = substr($filename, strrpos($filename,'.')+1);
1199 $save_extensions = array('jpg','jpeg','gif','png','bmp');
1200 return in_array($ext, $save_extensions);
1201 }
1202
1203
1204 /**
1205 ** HTMLFILTER ROUTINES
1206 */
1207
1208 /**
1209 * This function checks attribute values for entity-encoded values
1210 * and returns them translated into 8-bit strings so we can run
1211 * checks on them.
1212 *
1213 * @param $attvalue A string to run entity check against.
1214 * @return Nothing, modifies a reference value.
1215 */
1216 function sq_defang(&$attvalue){
1217 $me = 'sq_defang';
1218 /**
1219 * Skip this if there aren't ampersands or backslashes.
1220 */
1221 if (strpos($attvalue, '&') === false
1222 && strpos($attvalue, '\\') === false){
1223 return;
1224 }
1225 $m = false;
1226 // before deent, translate the dangerous unicode characters and ... to safe values
1227 // otherwise the regular expressions do not match.
1228
1229
1230
1231 do {
1232 $m = false;
1233 $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1234 $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1235 $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1236 } while ($m == true);
1237 $attvalue = stripslashes($attvalue);
1238 }
1239
1240 /**
1241 * Kill any tabs, newlines, or carriage returns. Our friends the
1242 * makers of the browser with 95% market value decided that it'd
1243 * be funny to make "java[tab]script" be just as good as "javascript".
1244 *
1245 * @param attvalue The attribute value before extraneous spaces removed.
1246 * @return attvalue Nothing, modifies a reference value.
1247 */
1248 function sq_unspace(&$attvalue){
1249 $me = 'sq_unspace';
1250 if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1251 $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1252 Array('', '', '', '', ''), $attvalue);
1253 }
1254 }
1255
1256 /**
1257 * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
1258 * IE as regular characters.
1259 *
1260 * @param attvalue The attribute value before dangerous characters are translated.
1261 * @return attvalue Nothing, modifies a reference value.
1262 * @author Marc Groot Koerkamp.
1263 */
1264 function sq_fixIE_idiocy(&$attvalue) {
1265 // remove NUL
1266 $attvalue = str_replace("\0", "", $attvalue);
1267 // remove comments
1268 $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1269
1270 // IE has the evil habit of accepting every possible value for the attribute expression.
1271 // The table below contains characters which are parsed by IE if they are used in the "expression"
1272 // attribute value.
1273 $aDangerousCharsReplacementTable = array(
1274 array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1275 '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1276 '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
1277 '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1278 '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
1279 '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1280 '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1281 '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1282 '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1283 '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1284 '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1285 '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1286 '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1287 '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1288 '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1289 '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1290 '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1291 '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1292 '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1293 '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1294 '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1295 '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1296 '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1297 '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
1298 "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range
1299 "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1300 "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1301 "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1302 "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1303 "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1304 "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1305 "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1306 "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1307 "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1308 "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1309 "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1310 "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1311 "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1312 "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1313 "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1314 "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1315 "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1316 "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1317 "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1318 "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1319 "\xCA\x9F", /* L UNICODE IPA Extension */
1320 "\xCA\x80", /* R UNICODE IPA Extension */
1321 "\xC9\xB4"), /* N UNICODE IPA Extension */
1322 array('l', 'l', 'r','r','n','n',
1323 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1324 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1325 'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
1326 $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1327
1328 // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1329 // used for XSS.
1330 $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1331 }
1332
1333 /**
1334 * This function returns the final tag out of the tag name, an array
1335 * of attributes, and the type of the tag. This function is called by
1336 * sq_sanitize internally.
1337 *
1338 * @param $tagname the name of the tag.
1339 * @param $attary the array of attributes and their values
1340 * @param $tagtype The type of the tag (see in comments).
1341 * @return a string with the final tag representation.
1342 */
1343 function sq_tagprint($tagname, $attary, $tagtype){
1344 $me = 'sq_tagprint';
1345
1346 if ($tagtype == 2){
1347 $fulltag = '</' . $tagname . '>';
1348 } else {
1349 $fulltag = '<' . $tagname;
1350 if (is_array($attary) && sizeof($attary)){
1351 $atts = Array();
1352 while (list($attname, $attvalue) = each($attary)){
1353 array_push($atts, "$attname=$attvalue");
1354 }
1355 $fulltag .= ' ' . join(" ", $atts);
1356 }
1357 if ($tagtype == 3){
1358 $fulltag .= ' /';
1359 }
1360 $fulltag .= '>';
1361 }
1362 return $fulltag;
1363 }
1364
1365 /**
1366 * A small helper function to use with array_walk. Modifies a by-ref
1367 * value and makes it lowercase.
1368 *
1369 * @param $val a value passed by-ref.
1370 * @return void since it modifies a by-ref value.
1371 */
1372 function sq_casenormalize(&$val){
1373 $val = strtolower($val);
1374 }
1375
1376 /**
1377 * This function skips any whitespace from the current position within
1378 * a string and to the next non-whitespace value.
1379 *
1380 * @param $body the string
1381 * @param $offset the offset within the string where we should start
1382 * looking for the next non-whitespace character.
1383 * @return the location within the $body where the next
1384 * non-whitespace char is located.
1385 */
1386 function sq_skipspace($body, $offset){
1387 $me = 'sq_skipspace';
1388 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
1389 if (sizeof($matches{1})){
1390 $count = strlen($matches{1});
1391 $offset += $count;
1392 }
1393 return $offset;
1394 }
1395
1396 /**
1397 * This function looks for the next character within a string. It's
1398 * really just a glorified "strpos", except it catches if failures
1399 * nicely.
1400 *
1401 * @param $body The string to look for needle in.
1402 * @param $offset Start looking from this position.
1403 * @param $needle The character/string to look for.
1404 * @return location of the next occurance of the needle, or
1405 * strlen($body) if needle wasn't found.
1406 */
1407 function sq_findnxstr($body, $offset, $needle){
1408 $me = 'sq_findnxstr';
1409 $pos = strpos($body, $needle, $offset);
1410 if ($pos === FALSE){
1411 $pos = strlen($body);
1412 }
1413 return $pos;
1414 }
1415
1416 /**
1417 * This function takes a PCRE-style regexp and tries to match it
1418 * within the string.
1419 *
1420 * @param $body The string to look for needle in.
1421 * @param $offset Start looking from here.
1422 * @param $reg A PCRE-style regex to match.
1423 * @return Returns a false if no matches found, or an array
1424 * with the following members:
1425 * - integer with the location of the match within $body
1426 * - string with whatever content between offset and the match
1427 * - string with whatever it is we matched
1428 */
1429 function sq_findnxreg($body, $offset, $reg){
1430 $me = 'sq_findnxreg';
1431 $matches = Array();
1432 $retarr = Array();
1433 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1434 if (!isset($matches{0}) || !$matches{0}){
1435 $retarr = false;
1436 } else {
1437 $retarr{0} = $offset + strlen($matches{1});
1438 $retarr{1} = $matches{1};
1439 $retarr{2} = $matches{2};
1440 }
1441 return $retarr;
1442 }
1443
1444 /**
1445 * This function looks for the next tag.
1446 *
1447 * @param $body String where to look for the next tag.
1448 * @param $offset Start looking from here.
1449 * @return false if no more tags exist in the body, or
1450 * an array with the following members:
1451 * - string with the name of the tag
1452 * - array with attributes and their values
1453 * - integer with tag type (1, 2, or 3)
1454 * - integer where the tag starts (starting "<")
1455 * - integer where the tag ends (ending ">")
1456 * first three members will be false, if the tag is invalid.
1457 */
1458 function sq_getnxtag($body, $offset){
1459 $me = 'sq_getnxtag';
1460 if ($offset > strlen($body)){
1461 return false;
1462 }
1463 $lt = sq_findnxstr($body, $offset, "<");
1464 if ($lt == strlen($body)){
1465 return false;
1466 }
1467 /**
1468 * We are here:
1469 * blah blah <tag attribute="value">
1470 * \---------^
1471 */
1472 $pos = sq_skipspace($body, $lt+1);
1473 if ($pos >= strlen($body)){
1474 return Array(false, false, false, $lt, strlen($body));
1475 }
1476 /**
1477 * There are 3 kinds of tags:
1478 * 1. Opening tag, e.g.:
1479 * <a href="blah">
1480 * 2. Closing tag, e.g.:
1481 * </a>
1482 * 3. XHTML-style content-less tag, e.g.:
1483 * <img src="blah" />
1484 */
1485 $tagtype = false;
1486 switch (substr($body, $pos, 1)){
1487 case '/':
1488 $tagtype = 2;
1489 $pos++;
1490 break;
1491 case '!':
1492 /**
1493 * A comment or an SGML declaration.
1494 */
1495 if (substr($body, $pos+1, 2) == "--"){
1496 $gt = strpos($body, "-->", $pos);
1497 if ($gt === false){
1498 $gt = strlen($body);
1499 } else {
1500 $gt += 2;
1501 }
1502 return Array(false, false, false, $lt, $gt);
1503 } else {
1504 $gt = sq_findnxstr($body, $pos, ">");
1505 return Array(false, false, false, $lt, $gt);
1506 }
1507 break;
1508 default:
1509 /**
1510 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1511 * later.
1512 */
1513 $tagtype = 1;
1514 break;
1515 }
1516
1517 $tag_start = $pos;
1518 $tagname = '';
1519 /**
1520 * Look for next [\W-_], which will indicate the end of the tag name.
1521 */
1522 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1523 if ($regary == false){
1524 return Array(false, false, false, $lt, strlen($body));
1525 }
1526 list($pos, $tagname, $match) = $regary;
1527 $tagname = strtolower($tagname);
1528
1529 /**
1530 * $match can be either of these:
1531 * '>' indicating the end of the tag entirely.
1532 * '\s' indicating the end of the tag name.
1533 * '/' indicating that this is type-3 xhtml tag.
1534 *
1535 * Whatever else we find there indicates an invalid tag.
1536 */
1537 switch ($match){
1538 case '/':
1539 /**
1540 * This is an xhtml-style tag with a closing / at the
1541 * end, like so: <img src="blah" />. Check if it's followed
1542 * by the closing bracket. If not, then this tag is invalid
1543 */
1544 if (substr($body, $pos, 2) == "/>"){
1545 $pos++;
1546 $tagtype = 3;
1547 } else {
1548 $gt = sq_findnxstr($body, $pos, ">");
1549 $retary = Array(false, false, false, $lt, $gt);
1550 return $retary;
1551 }
1552 case '>':
1553 return Array($tagname, false, $tagtype, $lt, $pos);
1554 break;
1555 default:
1556 /**
1557 * Check if it's whitespace
1558 */
1559 if (!preg_match('/\s/', $match)){
1560 /**
1561 * This is an invalid tag! Look for the next closing ">".
1562 */
1563 $gt = sq_findnxstr($body, $lt, ">");
1564 return Array(false, false, false, $lt, $gt);
1565 }
1566 break;
1567 }
1568
1569 /**
1570 * At this point we're here:
1571 * <tagname attribute='blah'>
1572 * \-------^
1573 *
1574 * At this point we loop in order to find all attributes.
1575 */
1576 $attname = '';
1577 $atttype = false;
1578 $attary = Array();
1579
1580 while ($pos <= strlen($body)){
1581 $pos = sq_skipspace($body, $pos);
1582 if ($pos == strlen($body)){
1583 /**
1584 * Non-closed tag.
1585 */
1586 return Array(false, false, false, $lt, $pos);
1587 }
1588 /**
1589 * See if we arrived at a ">" or "/>", which means that we reached
1590 * the end of the tag.
1591 */
1592 $matches = Array();
1593 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
1594 /**
1595 * Yep. So we did.
1596 */
1597 $pos += strlen($matches{1});
1598 if ($matches{2} == "/>"){
1599 $tagtype = 3;
1600 $pos++;
1601 }
1602 return Array($tagname, $attary, $tagtype, $lt, $pos);
1603 }
1604
1605 /**
1606 * There are several types of attributes, with optional
1607 * [:space:] between members.
1608 * Type 1:
1609 * attrname[:space:]=[:space:]'CDATA'
1610 * Type 2:
1611 * attrname[:space:]=[:space:]"CDATA"
1612 * Type 3:
1613 * attr[:space:]=[:space:]CDATA
1614 * Type 4:
1615 * attrname
1616 *
1617 * We leave types 1 and 2 the same, type 3 we check for
1618 * '"' and convert to "&quot" if needed, then wrap in
1619 * double quotes. Type 4 we convert into:
1620 * attrname="yes".
1621 */
1622 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
1623 if ($regary == false){
1624 /**
1625 * Looks like body ended before the end of tag.
1626 */
1627 return Array(false, false, false, $lt, strlen($body));
1628 }
1629 list($pos, $attname, $match) = $regary;
1630 $attname = strtolower($attname);
1631 /**
1632 * We arrived at the end of attribute name. Several things possible
1633 * here:
1634 * '>' means the end of the tag and this is attribute type 4
1635 * '/' if followed by '>' means the same thing as above
1636 * '\s' means a lot of things -- look what it's followed by.
1637 * anything else means the attribute is invalid.
1638 */
1639 switch($match){
1640 case '/':
1641 /**
1642 * This is an xhtml-style tag with a closing / at the
1643 * end, like so: <img src="blah" />. Check if it's followed
1644 * by the closing bracket. If not, then this tag is invalid
1645 */
1646 if (substr($body, $pos, 2) == "/>"){
1647 $pos++;
1648 $tagtype = 3;
1649 } else {
1650 $gt = sq_findnxstr($body, $pos, ">");
1651 $retary = Array(false, false, false, $lt, $gt);
1652 return $retary;
1653 }
1654 case '>':
1655 $attary{$attname} = '"yes"';
1656 return Array($tagname, $attary, $tagtype, $lt, $pos);
1657 break;
1658 default:
1659 /**
1660 * Skip whitespace and see what we arrive at.
1661 */
1662 $pos = sq_skipspace($body, $pos);
1663 $char = substr($body, $pos, 1);
1664 /**
1665 * Two things are valid here:
1666 * '=' means this is attribute type 1 2 or 3.
1667 * \w means this was attribute type 4.
1668 * anything else we ignore and re-loop. End of tag and
1669 * invalid stuff will be caught by our checks at the beginning
1670 * of the loop.
1671 */
1672 if ($char == "="){
1673 $pos++;
1674 $pos = sq_skipspace($body, $pos);
1675 /**
1676 * Here are 3 possibilities:
1677 * "'" attribute type 1
1678 * '"' attribute type 2
1679 * everything else is the content of tag type 3
1680 */
1681 $quot = substr($body, $pos, 1);
1682 if ($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} = "'" . $attval . "'";
1690 } else if ($quot == '"'){
1691 $regary = sq_findnxreg($body, $pos+1, '\"');
1692 if ($regary == false){
1693 return Array(false, false, false, $lt, strlen($body));
1694 }
1695 list($pos, $attval, $match) = $regary;
1696 $pos++;
1697 $attary{$attname} = '"' . $attval . '"';
1698 } else {
1699 /**
1700 * These are hateful. Look for \s, or >.
1701 */
1702 $regary = sq_findnxreg($body, $pos, "[\s>]");
1703 if ($regary == false){
1704 return Array(false, false, false, $lt, strlen($body));
1705 }
1706 list($pos, $attval, $match) = $regary;
1707 /**
1708 * If it's ">" it will be caught at the top.
1709 */
1710 $attval = preg_replace("/\"/s", "&quot;", $attval);
1711 $attary{$attname} = '"' . $attval . '"';
1712 }
1713 } else if (preg_match("|[\w/>]|", $char)) {
1714 /**
1715 * That was attribute type 4.
1716 */
1717 $attary{$attname} = '"yes"';
1718 } else {
1719 /**
1720 * An illegal character. Find next '>' and return.
1721 */
1722 $gt = sq_findnxstr($body, $pos, ">");
1723 return Array(false, false, false, $lt, $gt);
1724 }
1725 break;
1726 }
1727 }
1728 /**
1729 * The fact that we got here indicates that the tag end was never
1730 * found. Return invalid tag indication so it gets stripped.
1731 */
1732 return Array(false, false, false, $lt, strlen($body));
1733 }
1734
1735 /**
1736 * Translates entities into literal values so they can be checked.
1737 *
1738 * @param $attvalue the by-ref value to check.
1739 * @param $regex the regular expression to check against.
1740 * @param $hex whether the entites are hexadecimal.
1741 * @return True or False depending on whether there were matches.
1742 */
1743 function sq_deent(&$attvalue, $regex, $hex=false){
1744 $me = 'sq_deent';
1745 $ret_match = false;
1746 // remove comments
1747 //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
1748 preg_match_all($regex, $attvalue, $matches);
1749 if (is_array($matches) && sizeof($matches[0]) > 0){
1750 $repl = Array();
1751 for ($i = 0; $i < sizeof($matches[0]); $i++){
1752 $numval = $matches[1][$i];
1753 if ($hex){
1754 $numval = hexdec($numval);
1755 }
1756 $repl{$matches[0][$i]} = chr($numval);
1757 }
1758 $attvalue = strtr($attvalue, $repl);
1759 return true;
1760 } else {
1761 return false;
1762 }
1763 }
1764
1765 /**
1766 * This function runs various checks against the attributes.
1767 *
1768 * @param $tagname String with the name of the tag.
1769 * @param $attary Array with all tag attributes.
1770 * @param $rm_attnames See description for sq_sanitize
1771 * @param $bad_attvals See description for sq_sanitize
1772 * @param $add_attr_to_tag See description for sq_sanitize
1773 * @param $message message object
1774 * @param $id message id
1775 * @return Array with modified attributes.
1776 */
1777 function sq_fixatts($tagname,
1778 $attary,
1779 $rm_attnames,
1780 $bad_attvals,
1781 $add_attr_to_tag,
1782 $message,
1783 $id,
1784 $mailbox
1785 ){
1786 $me = 'sq_fixatts';
1787 while (list($attname, $attvalue) = each($attary)){
1788 /**
1789 * See if this attribute should be removed.
1790 */
1791 foreach ($rm_attnames as $matchtag=>$matchattrs){
1792 if (preg_match($matchtag, $tagname)){
1793 foreach ($matchattrs as $matchattr){
1794 if (preg_match($matchattr, $attname)){
1795 unset($attary{$attname});
1796 continue;
1797 }
1798 }
1799 }
1800 }
1801 /**
1802 * Workaround for IE quirks
1803 */
1804 sq_fixIE_idiocy($attvalue);
1805
1806 /**
1807 * Remove any backslashes, entities, and extraneous whitespace.
1808 */
1809
1810 $oldattvalue = $attvalue;
1811 sq_defang($attvalue);
1812 if ($attname == 'style' && $attvalue !== $oldattvalue) {
1813 // entities are used in the attribute value. In 99% of the cases it's there as XSS
1814 // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1815 $attvalue = "idiocy";
1816 $attary{$attname} = $attvalue;
1817 }
1818 sq_unspace($attvalue);
1819
1820 /**
1821 * Now let's run checks on the attvalues.
1822 * I don't expect anyone to comprehend this. If you do,
1823 * get in touch with me so I can drive to where you live and
1824 * shake your hand personally. :)
1825 */
1826 foreach ($bad_attvals as $matchtag=>$matchattrs){
1827 if (preg_match($matchtag, $tagname)){
1828 foreach ($matchattrs as $matchattr=>$valary){
1829 if (preg_match($matchattr, $attname)){
1830 /**
1831 * There are two arrays in valary.
1832 * First is matches.
1833 * Second one is replacements
1834 */
1835 list($valmatch, $valrepl) = $valary;
1836 $newvalue =
1837 preg_replace($valmatch, $valrepl, $attvalue);
1838 if ($newvalue != $attvalue){
1839 $attary{$attname} = $newvalue;
1840 $attvalue = $newvalue;
1841 }
1842 }
1843 }
1844 }
1845 }
1846 if ($attname == 'style') {
1847 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1848 // 8bit and control characters in style attribute values can be used for XSS, remove them
1849 $attary{$attname} = '"disallowed character"';
1850 }
1851 preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1852 if (count($aMatch)) {
1853 foreach($aMatch[1] as $sMatch) {
1854 // url value
1855 $urlvalue = $sMatch;
1856 sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1857 $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1858 }
1859 }
1860 }
1861 /**
1862 * Use white list based filtering on attributes which can contain url's
1863 */
1864 else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
1865 sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1866 $attary{$attname} = $attvalue;
1867 }
1868 }
1869 /**
1870 * See if we need to append any attributes to this tag.
1871 */
1872 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1873 if (preg_match($matchtag, $tagname)){
1874 $attary = array_merge($attary, $addattary);
1875 }
1876 }
1877 return $attary;
1878 }
1879
1880 /**
1881 * This function filters url's
1882 *
1883 * @param $attvalue String with attribute value to filter
1884 * @param $message message object
1885 * @param $id message id
1886 * @param $mailbox mailbox
1887 * @param $sQuote quoting characters around url's
1888 */
1889 function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1890 $attvalue = trim($attvalue);
1891 if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1892 // remove the double quotes
1893 $sQuote = $attvalue[0];
1894 $attvalue = trim(substr($attvalue,1,-1));
1895 }
1896
1897 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
1898 // images off by default.
1899 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
1900
1901 global $use_transparent_security_image;
1902 if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
1903 else $secremoveimg = '../images/' . _("sec_remove_eng.png");
1904
1905 /**
1906 * Replace empty src tags with the blank image. src is only used
1907 * for frames, images, and image inputs. Doing a replace should
1908 * not affect them working as should be, however it will stop
1909 * IE from being kicked off when src for img tags are not set
1910 */
1911 if ($attvalue == '') {
1912 $attvalue = '"' . SM_PATH . 'images/blank.png"';
1913 } else {
1914 // first, disallow 8 bit characters and control characters
1915 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1916 switch ($attname) {
1917 case 'href':
1918 $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1919 break;
1920 default:
1921 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1922 break;
1923 }
1924 } else {
1925 $aUrl = parse_url($attvalue);
1926 if (isset($aUrl['scheme'])) {
1927 switch(strtolower($aUrl['scheme'])) {
1928 case 'mailto':
1929 case 'http':
1930 case 'https':
1931 case 'ftp':
1932 if ($attname != 'href') {
1933 if ($view_unsafe_images == false) {
1934 $attvalue = $sQuote . $secremoveimg . $sQuote;
1935 } else {
1936 if (isset($aUrl['path'])) {
1937
1938 // No one has been able to show that image URIs
1939 // can be exploited, so for now, no restrictions
1940 // are made at all. If this proves to be a problem,
1941 // the commented-out code below can be of help.
1942 // (One consideration is that I see nothing in this
1943 // function that specifically says that we will
1944 // only ever arrive here when inspecting an image
1945 // tag, although that does seem to be the end
1946 // result - e.g., <script src="..."> where malicious
1947 // image URIs are in fact a problem are already
1948 // filtered out elsewhere.
1949 /* ---------------------------------
1950 // validate image extension.
1951 $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1952 if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
1953 // If URI is to something other than
1954 // a regular image file, get the contents
1955 // and try to see if it is an image.
1956 // Don't use Fileinfo (finfo_file()) because
1957 // we'd need to make the admin configure the
1958 // location of the magic.mime file (FIXME: add finfo_file() support later?)
1959 //
1960 $mime_type = '';
1961 if (function_exists('mime_content_type')
1962 && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
1963
1964 // fetch file
1965 //
1966 $file_contents = '';
1967 while (!feof($FILE)) {
1968 $file_contents .= fread($FILE, 8192);
1969 }
1970 fclose($FILE);
1971
1972 // store file locally
1973 //
1974 global $attachment_dir, $username;
1975 $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
1976 $localfilename = GenerateRandomString(32, '', 7);
1977 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1978 while (file_exists($full_localfilename)) {
1979 $localfilename = GenerateRandomString(32, '', 7);
1980 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1981 }
1982 $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
1983 fwrite($FILE, $file_contents);
1984 fclose($FILE);
1985
1986 // get mime type and remove file
1987 //
1988 $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
1989 unlink("$hashed_attachment_dir/$localfilename");
1990 }
1991 // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
1992 if (substr(strtolower($mime_type), 0, 5) != 'image') {
1993 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1994 }
1995 }
1996 --------------------------------- */
1997 } else {
1998 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1999 }
2000 }
2001 } else {
2002 $attvalue = $sQuote . $attvalue . $sQuote;
2003 }
2004 break;
2005 case 'outbind':
2006 /**
2007 * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
2008 * One day MS might actually make it match something useful, for now, falling
2009 * back to using cid2http, so we can grab the blank.png.
2010 */
2011 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
2012 break;
2013 case 'cid':
2014 /**
2015 * Turn cid: urls into http-friendly ones.
2016 */
2017 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
2018 break;
2019 default:
2020 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2021 break;
2022 }
2023 } else {
2024 if (!isset($aUrl['path']) || $aUrl['path'] != $secremoveimg) {
2025 // parse_url did not lead to satisfying result
2026 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2027 }
2028 }
2029 }
2030 }
2031 }
2032
2033 /**
2034 * This function edits the style definition to make them friendly and
2035 * usable in SquirrelMail.
2036 *
2037 * @param $message the message object
2038 * @param $id the message id
2039 * @param $content a string with whatever is between <style> and </style>
2040 * @param $mailbox the message mailbox
2041 * @return a string with edited content.
2042 */
2043 function sq_fixstyle($body, $pos, $message, $id, $mailbox){
2044 $me = 'sq_fixstyle';
2045 // workaround for </style> in between comments
2046 $iCurrentPos = $pos;
2047 $content = '';
2048 $sToken = '';
2049 $bSucces = false;
2050 $bEndTag = false;
2051 for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
2052 $char = $body{$i};
2053 switch ($char) {
2054 case '<':
2055 $sToken = $char;
2056 break;
2057 case '/':
2058 if ($sToken == '<') {
2059 $sToken .= $char;
2060 $bEndTag = true;
2061 } else {
2062 $content .= $char;
2063 }
2064 break;
2065 case '>':
2066 if ($bEndTag) {
2067 $sToken .= $char;
2068 if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
2069 $newpos = $i + 1;
2070 $bSucces = true;
2071 break 2;
2072 } else {
2073 $content .= $sToken;
2074 }
2075 $bEndTag = false;
2076 } else {
2077 $content .= $char;
2078 }
2079 break;
2080 case '!':
2081 if ($sToken == '<') {
2082 // possible comment
2083 if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
2084 $i = strpos($body,'-->',$i+3);
2085 if ($i === false) { // no end comment
2086 $i = strlen($body);
2087 }
2088 $sToken = '';
2089 }
2090 } else {
2091 $content .= $char;
2092 }
2093 break;
2094 default:
2095 if ($bEndTag) {
2096 $sToken .= $char;
2097 } else {
2098 $content .= $char;
2099 }
2100 break;
2101 }
2102 }
2103 if ($bSucces == FALSE){
2104 return array(FALSE, strlen($body));
2105 }
2106
2107
2108
2109 /**
2110 * First look for general BODY style declaration, which would be
2111 * like so:
2112 * body {background: blah-blah}
2113 * and change it to .bodyclass so we can just assign it to a <div>
2114 */
2115 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
2116
2117 global $use_transparent_security_image;
2118 if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
2119 else $secremoveimg = '../images/' . _("sec_remove_eng.png");
2120
2121 /**
2122 * Fix url('blah') declarations.
2123 */
2124 // $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
2125 // "url(\\1$secremoveimg\\2)", $content);
2126
2127 // first check for 8bit sequences and disallowed control characters
2128 if (preg_match('/[\16-\37\200-\377]+/',$content)) {
2129 $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
2130 return array($content, $newpos);
2131 }
2132
2133 // IE Sucks hard. We have a special function for it.
2134 sq_fixIE_idiocy($content);
2135
2136 // remove @import line
2137 $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2138
2139 // translate ur\l and variations (IE parses that)
2140 // TODO check if the sq_fixIE_idiocy function already handles this.
2141 $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
2142 preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2143 if (count($aMatch)) {
2144 $aValue = $aReplace = array();
2145 foreach($aMatch[1] as $sMatch) {
2146 // url value
2147 $urlvalue = $sMatch;
2148 sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2149 $aValue[] = $sMatch;
2150 $aReplace[] = $urlvalue;
2151 }
2152 $content = str_replace($aValue,$aReplace,$content);
2153 }
2154
2155 /**
2156 * Remove any backslashes, entities, and extraneous whitespace.
2157 */
2158 $contentTemp = $content;
2159 sq_defang($contentTemp);
2160 sq_unspace($contentTemp);
2161
2162 /**
2163 * Fix stupid css declarations which lead to vulnerabilities
2164 * in IE.
2165 *
2166 * Also remove "position" attribute, as it can easily be set
2167 * to "fixed" or "absolute" with "left" and "top" attributes
2168 * of zero, taking over the whole content frame. It can also
2169 * be set to relative and move itself anywhere it wants to,
2170 * displaying content in areas it shouldn't be allowed to touch.
2171 */
2172 $match = Array('/\/\*.*\*\//',
2173 '/expression/i',
2174 '/behaviou*r/i',
2175 '/binding/i',
2176 '/include-source/i',
2177 '/javascript/i',
2178 '/script/i',
2179 '/position/i');
2180 $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
2181 $contentNew = preg_replace($match, $replace, $contentTemp);
2182 if ($contentNew !== $contentTemp) {
2183 // insecure css declarations are used. From now on we don't care
2184 // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2185 $content = $contentNew;
2186 }
2187 return array($content, $newpos);
2188 }
2189
2190
2191 /**
2192 * This function converts cid: url's into the ones that can be viewed in
2193 * the browser.
2194 *
2195 * @param $message the message object
2196 * @param $id the message id
2197 * @param $cidurl the cid: url.
2198 * @param $mailbox the message mailbox
2199 * @return a string with a http-friendly url
2200 */
2201 function sq_cid2http($message, $id, $cidurl, $mailbox){
2202 /**
2203 * Get rid of quotes.
2204 */
2205 $quotchar = substr($cidurl, 0, 1);
2206 if ($quotchar == '"' || $quotchar == "'"){
2207 $cidurl = str_replace($quotchar, "", $cidurl);
2208 } else {
2209 $quotchar = '';
2210 }
2211 $cidurl = substr(trim($cidurl), 4);
2212
2213 $match_str = '/\{.*?\}\//';
2214 $str_rep = '';
2215 $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2216
2217 $linkurl = find_ent_id($cidurl, $message);
2218 /* in case of non-safe cid links $httpurl should be replaced by a sort of
2219 unsafe link image */
2220 $httpurl = '';
2221
2222 /**
2223 * This is part of a fix for Outlook Express 6.x generating
2224 * cid URLs without creating content-id headers. These images are
2225 * not part of the multipart/related html mail. The html contains
2226 * <img src="cid:{some_id}/image_filename.ext"> references to
2227 * attached images with as goal to render them inline although
2228 * the attachment disposition property is not inline.
2229 */
2230
2231 if (empty($linkurl)) {
2232 if (preg_match('/{.*}\//', $cidurl)) {
2233 $cidurl = preg_replace('/{.*}\//','', $cidurl);
2234 if (!empty($cidurl)) {
2235 $linkurl = find_ent_id($cidurl, $message);
2236 }
2237 }
2238 }
2239
2240 if (!empty($linkurl)) {
2241 $httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&amp;' .
2242 "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2243 '&amp;ent_id=' . $linkurl . $quotchar;
2244 } else {
2245 /**
2246 * If we couldn't generate a proper img url, drop in a blank image
2247 * instead of sending back empty, otherwise it causes unusual behaviour
2248 */
2249 $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
2250 }
2251
2252 return $httpurl;
2253 }
2254
2255 /**
2256 * This function changes the <body> tag into a <div> tag since we
2257 * can't really have a body-within-body.
2258 *
2259 * @param $attary an array of attributes and values of <body>
2260 * @param $mailbox mailbox we're currently reading (for cid2http)
2261 * @param $message current message (for cid2http)
2262 * @param $id current message id (for cid2http)
2263 * @return a modified array of attributes to be set for <div>
2264 */
2265 function sq_body2div($attary, $mailbox, $message, $id){
2266 $me = 'sq_body2div';
2267 $divattary = Array('class' => "'bodyclass'");
2268 $text = '#000000';
2269 $has_bgc_stl = $has_txt_stl = false;
2270 $styledef = '';
2271 if (is_array($attary) && sizeof($attary) > 0){
2272 foreach ($attary as $attname=>$attvalue){
2273 $quotchar = substr($attvalue, 0, 1);
2274 $attvalue = str_replace($quotchar, "", $attvalue);
2275 switch ($attname){
2276 case 'background':
2277 $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
2278 $styledef .= "background-image: url('$attvalue'); ";
2279 break;
2280 case 'bgcolor':
2281 $has_bgc_stl = true;
2282 $styledef .= "background-color: $attvalue; ";
2283 break;
2284 case 'text':
2285 $has_txt_stl = true;
2286 $styledef .= "color: $attvalue; ";
2287 break;
2288 }
2289 }
2290 // Outlook defines a white bgcolor and no text color. This can lead to
2291 // white text on a white bg with certain themes.
2292 if ($has_bgc_stl && !$has_txt_stl) {
2293 $styledef .= "color: $text; ";
2294 }
2295 if (strlen($styledef) > 0){
2296 $divattary{"style"} = "\"$styledef\"";
2297 }
2298 }
2299 return $divattary;
2300 }
2301
2302 /**
2303 * This is the main function and the one you should actually be calling.
2304 * There are several variables you should be aware of an which need
2305 * special description.
2306 *
2307 * Since the description is quite lengthy, see it here:
2308 * http://linux.duke.edu/projects/mini/htmlfilter/
2309 *
2310 * @param $body the string with HTML you wish to filter
2311 * @param $tag_list see description above
2312 * @param $rm_tags_with_content see description above
2313 * @param $self_closing_tags see description above
2314 * @param $force_tag_closing see description above
2315 * @param $rm_attnames see description above
2316 * @param $bad_attvals see description above
2317 * @param $add_attr_to_tag see description above
2318 * @param $message message object
2319 * @param $id message id
2320 * @return sanitized html safe to show on your pages.
2321 */
2322 function sq_sanitize($body,
2323 $tag_list,
2324 $rm_tags_with_content,
2325 $self_closing_tags,
2326 $force_tag_closing,
2327 $rm_attnames,
2328 $bad_attvals,
2329 $add_attr_to_tag,
2330 $message,
2331 $id,
2332 $mailbox
2333 ){
2334 $me = 'sq_sanitize';
2335 $rm_tags = array_shift($tag_list);
2336 /**
2337 * Normalize rm_tags and rm_tags_with_content.
2338 */
2339 @array_walk($tag_list, 'sq_casenormalize');
2340 @array_walk($rm_tags_with_content, 'sq_casenormalize');
2341 @array_walk($self_closing_tags, 'sq_casenormalize');
2342 /**
2343 * See if tag_list is of tags to remove or tags to allow.
2344 * false means remove these tags
2345 * true means allow these tags
2346 */
2347 $curpos = 0;
2348 $open_tags = Array();
2349 $trusted = "\n<!-- begin sanitized html -->\n";
2350 $skip_content = false;
2351 /**
2352 * Take care of netscape's stupid javascript entities like
2353 * &{alert('boo')};
2354 */
2355 $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
2356
2357 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
2358 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
2359 $free_content = substr($body, $curpos, $lt-$curpos);
2360 /**
2361 * Take care of <style>
2362 */
2363 if ($tagname == "style" && $tagtype == 1){
2364 list($free_content, $curpos) =
2365 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
2366 if ($free_content != FALSE){
2367 if ( !empty($attary) ) {
2368 $attary = sq_fixatts($tagname,
2369 $attary,
2370 $rm_attnames,
2371 $bad_attvals,
2372 $add_attr_to_tag,
2373 $message,
2374 $id,
2375 $mailbox
2376 );
2377 }
2378 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2379 $trusted .= $free_content;
2380 $trusted .= sq_tagprint($tagname, false, 2);
2381 }
2382 continue;
2383 }
2384 if ($skip_content == false){
2385 $trusted .= $free_content;
2386 }
2387 if ($tagname != FALSE){
2388 if ($tagtype == 2){
2389 if ($skip_content == $tagname){
2390 /**
2391 * Got to the end of tag we needed to remove.
2392 */
2393 $tagname = false;
2394 $skip_content = false;
2395 } else {
2396 if ($skip_content == false){
2397 if ($tagname == "body"){
2398 $tagname = "div";
2399 }
2400 if (isset($open_tags{$tagname}) &&
2401 $open_tags{$tagname} > 0){
2402 $open_tags{$tagname}--;
2403 } else {
2404 $tagname = false;
2405 }
2406 }
2407 }
2408 } else {
2409 /**
2410 * $rm_tags_with_content
2411 */
2412 if ($skip_content == false){
2413 /**
2414 * See if this is a self-closing type and change
2415 * tagtype appropriately.
2416 */
2417 if ($tagtype == 1
2418 && in_array($tagname, $self_closing_tags)){
2419 $tagtype = 3;
2420 }
2421 /**
2422 * See if we should skip this tag and any content
2423 * inside it.
2424 */
2425 if ($tagtype == 1 &&
2426 in_array($tagname, $rm_tags_with_content)){
2427 $skip_content = $tagname;
2428 } else {
2429 if (($rm_tags == false
2430 && in_array($tagname, $tag_list)) ||
2431 ($rm_tags == true &&
2432 !in_array($tagname, $tag_list))){
2433 $tagname = false;
2434 } else {
2435 /**
2436 * Convert body into div.
2437 */
2438 if ($tagname == "body"){
2439 $tagname = "div";
2440 $attary = sq_body2div($attary, $mailbox,
2441 $message, $id);
2442 }
2443 if ($tagtype == 1){
2444 if (isset($open_tags{$tagname})){
2445 $open_tags{$tagname}++;
2446 } else {
2447 $open_tags{$tagname}=1;
2448 }
2449 }
2450 /**
2451 * This is where we run other checks.
2452 */
2453 if (is_array($attary) && sizeof($attary) > 0){
2454 $attary = sq_fixatts($tagname,
2455 $attary,
2456 $rm_attnames,
2457 $bad_attvals,
2458 $add_attr_to_tag,
2459 $message,
2460 $id,
2461 $mailbox
2462 );
2463 }
2464 }
2465 }
2466 }
2467 }
2468 if ($tagname != false && $skip_content == false){
2469 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2470 }
2471 }
2472 $curpos = $gt+1;
2473 }
2474 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2475 if ($force_tag_closing == true){
2476 foreach ($open_tags as $tagname=>$opentimes){
2477 while ($opentimes > 0){
2478 $trusted .= '</' . $tagname . '>';
2479 $opentimes--;
2480 }
2481 }
2482 $trusted .= "\n";
2483 }
2484 $trusted .= "<!-- end sanitized html -->\n";
2485 return $trusted;
2486 }
2487
2488 /**
2489 * This is a wrapper function to call html sanitizing routines.
2490 *
2491 * @param $body the body of the message
2492 * @param $id the id of the message
2493
2494 * @param $message
2495 * @param $mailbox
2496 * @param boolean $take_mailto_links When TRUE, converts mailto: links
2497 * into internal SM compose links
2498 * (optional; default = TRUE)
2499 * @return a string with html safe to display in the browser.
2500 */
2501 function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2502
2503 // require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
2504
2505 global $attachment_common_show_images, $view_unsafe_images,
2506 $has_unsafe_images;
2507 /**
2508 * Don't display attached images in HTML mode.
2509 *
2510 * SB: why?
2511 */
2512 $attachment_common_show_images = false;
2513 $tag_list = Array(
2514 false,
2515 "object",
2516 "meta",
2517 "html",
2518 "head",
2519 "base",
2520 "link",
2521 "frame",
2522 "iframe",
2523 "plaintext",
2524 "marquee"
2525 );
2526
2527 $rm_tags_with_content = Array(
2528 "script",
2529 "applet",
2530 "embed",
2531 "title",
2532 "frameset",
2533 "xmp",
2534 "xml"
2535 );
2536
2537 $self_closing_tags = Array(
2538 "img",
2539 "br",
2540 "hr",
2541 "input",
2542 "outbind"
2543 );
2544
2545 $force_tag_closing = true;
2546
2547 $rm_attnames = Array(
2548 "/.*/" =>
2549 Array(
2550 "/target/i",
2551 "/^on.*/i",
2552 "/^dynsrc/i",
2553 "/^data.*/i",
2554 "/^lowsrc.*/i"
2555 )
2556 );
2557
2558 global $use_transparent_security_image;
2559 if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
2560 else $secremoveimg = '../images/' . _("sec_remove_eng.png");
2561
2562 $bad_attvals = Array(
2563 "/.*/" =>
2564 Array(
2565 "/^src|background/i" =>
2566 Array(
2567 Array(
2568 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2569 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2570 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2571 ),
2572 Array(
2573 "\\1$secremoveimg\\2",
2574 "\\1$secremoveimg\\2",
2575 "\\1$secremoveimg\\2",
2576 )
2577 ),
2578 "/^href|action/i" =>
2579 Array(
2580 Array(
2581 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2582 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2583 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2584 ),
2585 Array(
2586 "\\1#\\1",
2587 "\\1#\\1",
2588 "\\1#\\1"
2589 )
2590 ),
2591 "/^style/i" =>
2592 Array(
2593 Array(
2594 "/\/\*.*\*\//",
2595 "/expression/i",
2596 "/binding/i",
2597 "/behaviou*r/i",
2598 "/include-source/i",
2599
2600 // position:relative can also be exploited
2601 // to put content outside of email body area
2602 // and position:fixed is similarly exploitable
2603 // as position:absolute, so we'll remove it
2604 // altogether....
2605 //
2606 // Does this screw up legitimate HTML messages?
2607 // If so, the only fix I see is to allow position
2608 // attributes (any values? I think we still have
2609 // to block static and fixed) only if $use_iframe
2610 // is enabled (1.5.0+)
2611 //
2612 // was: "/position\s*:\s*absolute/i",
2613 //
2614 "/position\s*:/i",
2615
2616 "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
2617 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2618 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2619 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
2620 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
2621 ),
2622 Array(
2623 "",
2624 "idiocy",
2625 "idiocy",
2626 "idiocy",
2627 "idiocy",
2628 "idiocy",
2629 "url",
2630 "url(\\1#\\1)",
2631 "url(\\1#\\1)",
2632 "url(\\1#\\1)",
2633 "\\1:url(\\2#\\3)"
2634 )
2635 )
2636 )
2637 );
2638
2639 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
2640 // images off by default.
2641 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
2642
2643 if (!$view_unsafe_images){
2644 /**
2645 * Remove any references to http/https if view_unsafe_images set
2646 * to false.
2647 */
2648 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
2649 '/^([\'\"])\s*https*:.*([\'\"])/si');
2650 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
2651 "\\1$secremoveimg\\1");
2652 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
2653 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
2654 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
2655 "url(\\1$secremoveimg\\1)");
2656 }
2657
2658 $add_attr_to_tag = Array(
2659 "/^a$/i" =>
2660 Array('target'=>'"_blank"',
2661 'title'=>'"'._("This external link will open in a new window").'"'
2662 )
2663 );
2664 $trusted = sq_sanitize($body,
2665 $tag_list,
2666 $rm_tags_with_content,
2667 $self_closing_tags,
2668 $force_tag_closing,
2669 $rm_attnames,
2670 $bad_attvals,
2671 $add_attr_to_tag,
2672 $message,
2673 $id,
2674 $mailbox
2675 );
2676 if (strpos($trusted,$secremoveimg)){
2677 $has_unsafe_images = true;
2678 }
2679
2680 // we want to parse mailto's in HTML output, change to SM compose links
2681 // this is a modified version of code from url_parser.php... but Marc is
2682 // right: we need a better filtering implementation; adding this randomly
2683 // here is not a great solution
2684 //
2685 if ($take_mailto_links) {
2686 // parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
2687 global $MailTo_PReg_Match;
2688 $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
2689 if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2690 foreach ($regs[0] as $i => $mailto_before) {
2691 $mailto_params = $regs[10][$i];
2692 // get rid of any tailing quote since we have to add send_to to the end
2693 //
2694 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
2695 $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
2696 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
2697 $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
2698
2699 if ($regs[1][$i]) { //if there is an email addr before '?', we need to merge it with the params
2700 $to = 'to=' . $regs[1][$i];
2701 if (strpos($mailto_params, 'to=') > -1) //already a 'to='
2702 $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2703 else {
2704 if ($mailto_params) //already some params, append to them
2705 $mailto_params .= '&amp;' . $to;
2706 else
2707 $mailto_params .= '?' . $to;
2708 }
2709 }
2710
2711 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2712
2713 // we'll already have target=_blank, no need to allow comp_in_new
2714 // here (which would be a lot more work anyway)
2715 //
2716 global $compose_new_win;
2717 $temp_comp_in_new = $compose_new_win;
2718 $compose_new_win = 0;
2719 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2720 $compose_new_win = $temp_comp_in_new;
2721
2722 // remove <a href=" and anything after the next quote (we only
2723 // need the uri, not the link HTML) in compose uri
2724 //
2725 $comp_uri = substr($comp_uri, 9);
2726 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2727 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2728 }
2729 }
2730 }
2731
2732 return $trusted;
2733 }
2734
2735 /**
2736 * function SendDownloadHeaders - send file to the browser
2737 *
2738 * Original Source: SM core src/download.php
2739 * moved here to make it available to other code, and separate
2740 * front end from back end functionality.
2741 *
2742 * @param string $type0 first half of mime type
2743 * @param string $type1 second half of mime type
2744 * @param string $filename filename to tell the browser for downloaded file
2745 * @param boolean $force whether to force the download dialog to pop
2746 * @param optional integer $filesize send the Content-Header and length to the browser
2747 * @return void
2748 */
2749 function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2750 global $languages, $squirrelmail_language;
2751 $isIE = $isIE6plus = false;
2752
2753 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2754
2755 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
2756 strstr($HTTP_USER_AGENT, 'Opera') === false) {
2757 $isIE = true;
2758 }
2759
2760 if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2761 ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2762 $isIE6plus = true;
2763 }
2764
2765 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
2766 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
2767 $filename =
2768 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
2769 } else {
2770 $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&nbsp;', ' ', $filename));
2771 }
2772
2773 // A Pox on Microsoft and it's Internet Explorer!
2774 //
2775 // IE has lots of bugs with file downloads.
2776 // It also has problems with SSL. Both of these cause problems
2777 // for us in this function.
2778 //
2779 // See this article on Cache Control headers and SSL
2780 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2781 //
2782 // The best thing you can do for IE is to upgrade to the latest
2783 // version
2784 //set all the Cache Control Headers for IE
2785 if ($isIE) {
2786 $filename=rawurlencode($filename);
2787 header ("Pragma: public");
2788 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
2789 // does nothing - see: https://blogs.msdn.microsoft.com/ieinternals/2009/07/20/internet-explorers-cache-control-extensions/
2790 // header ("Cache-Control: post-check=0, pre-check=0", false);
2791 header ("Cache-Control: private");
2792
2793 //set the inline header for IE, we'll add the attachment header later if we need it
2794 header ("Content-Disposition: inline; filename=$filename");
2795 }
2796
2797 if (!$force) {
2798 // Try to show in browser window
2799 header ("Content-Disposition: inline; filename=\"$filename\"");
2800 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2801 } else {
2802 // Try to pop up the "save as" box
2803
2804 // IE makes this hard. It pops up 2 save boxes, or none.
2805 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2806 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2807 // But, according to Microsoft, it is "RFC compliant but doesn't
2808 // take into account some deviations that allowed within the
2809 // specification." Doesn't that mean RFC non-compliant?
2810 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2811
2812 // all browsers need the application/octet-stream header for this
2813 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2814
2815 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2816 // Do not have quotes around filename, but that applied to
2817 // "attachment"... does it apply to inline too?
2818 header ("Content-Disposition: attachment; filename=\"$filename\"");
2819
2820 if ($isIE && !$isIE6plus) {
2821 // This combination seems to work mostly. IE 5.5 SP 1 has
2822 // known issues (see the Microsoft Knowledge Base)
2823
2824 // This works for most types, but doesn't work with Word files
2825 header ("Content-Type: application/download; name=\"$filename\"");
2826 header ("Content-Type: application/force-download; name=\"$filename\"");
2827 // These are spares, just in case. :-)
2828 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2829 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2830 //header("Content-Type: application/octet-stream; name=\"$filename\"");
2831 } else if ($isIE) {
2832 // This is to prevent IE for MIME sniffing and auto open a file in IE
2833 header ("Content-Type: application/force-download; name=\"$filename\"");
2834 } else {
2835 // another application/octet-stream forces download for Netscape
2836 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2837 }
2838 }
2839
2840 //send the content-length header if the calling function provides it
2841 if ($filesize > 0) {
2842 header("Content-Length: $filesize");
2843 }
2844
2845 } // end fn SendDownloadHeaders