15b456c4e3c0a13b7905991d3fd508202a538b83
[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 1999-2012 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 $aString = explode(' ',$string);
810 $ret = '';
811 foreach ($aString as $chunk) {
812 if ($encoded && $chunk === '') {
813 continue;
814 } elseif ($chunk === '') {
815 $ret .= ' ';
816 continue;
817 }
818 $encoded = false;
819 /* if encoded words are not separated by a linear-space-white we still catch them */
820 $j = $i-1;
821
822 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
823 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
824 if ($iLastMatch !== $j) {
825 if ($htmlsafe) {
826 $ret .= '&#32;';
827 } else {
828 $ret .= ' ';
829 }
830 }
831 $iLastMatch = $i;
832 $j = $i;
833 if ($htmlsafe) {
834 $ret .= sm_encode_html_special_chars($res[1]);
835 } else {
836 $ret .= $res[1];
837 }
838 $encoding = ucfirst($res[3]);
839
840 /* decide about valid decoding */
841 if ($decide && is_conversion_safe($res[2])) {
842 $utfencode=true;
843 $can_be_encoded=true;
844 } else {
845 $can_be_encoded=false;
846 }
847 switch ($encoding)
848 {
849 case 'B':
850 $replace = base64_decode($res[4]);
851 if ($utfencode) {
852 if ($can_be_encoded) {
853 /* convert string to different charset,
854 * if functions asks for it (usually in compose)
855 */
856 $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
857 } else {
858 // convert string to html codes in order to display it
859 $ret .= charset_decode($res[2],$replace);
860 }
861 } else {
862 if ($htmlsafe) {
863 $replace = sm_encode_html_special_chars($replace);
864 }
865 $ret.= $replace;
866 }
867 break;
868 case 'Q':
869 $replace = str_replace('_', ' ', $res[4]);
870 $replace = preg_replace_callback('/=([0-9a-f]{2})/i',
871 create_function ('$matches', 'return chr(hexdec($matches[1]));'),
872 $replace);
873 if ($utfencode) {
874 if ($can_be_encoded) {
875 /* convert string to different charset,
876 * if functions asks for it (usually in compose)
877 */
878 $replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
879 } else {
880 // convert string to html codes in order to display it
881 $replace = charset_decode($res[2], $replace);
882 }
883 } else {
884 if ($htmlsafe) {
885 $replace = sm_encode_html_special_chars($replace);
886 }
887 }
888 $ret .= $replace;
889 break;
890 default:
891 break;
892 }
893 $chunk = $res[5];
894 $encoded = true;
895 }
896 if (!$encoded) {
897 if ($htmlsafe) {
898 $ret .= '&#32;';
899 } else {
900 $ret .= ' ';
901 }
902 }
903
904 if (!$encoded && $htmlsafe) {
905 $ret .= sm_encode_html_special_chars($chunk);
906 } else {
907 $ret .= $chunk;
908 }
909 ++$i;
910 }
911 /* remove the first added space */
912 if ($ret) {
913 if ($htmlsafe) {
914 $ret = substr($ret,5);
915 } else {
916 $ret = substr($ret,1);
917 }
918 }
919
920 return $ret;
921 }
922
923 /**
924 * Encodes header
925 *
926 * Function uses XTRA_CODE _encodeheader function, if such function exists.
927 *
928 * Function uses Q encoding by default and encodes a string according to RFC
929 * 1522 for use in headers if it contains 8-bit characters or anything that
930 * looks like it should be encoded.
931 *
932 * Function switches to B encoding and encodeHeaderBase64() function, if
933 * string is 8bit and multibyte character set supported by mbstring extension
934 * is used. It can cause E_USER_NOTICE errors, if interface is used with
935 * multibyte character set unsupported by mbstring extension.
936 *
937 * @param string $string header string, that has to be encoded
938 * @return string quoted-printable encoded string
939 * @todo make $mb_charsets system wide constant
940 */
941 function encodeHeader ($string) {
942 global $default_charset, $languages, $squirrelmail_language;
943
944 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
945 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
946 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
947 }
948
949 // Use B encoding for multibyte charsets
950 $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
951 if (in_array($default_charset,$mb_charsets) &&
952 in_array($default_charset,sq_mb_list_encodings()) &&
953 sq_is8bit($string)) {
954 return encodeHeaderBase64($string,$default_charset);
955 } elseif (in_array($default_charset,$mb_charsets) &&
956 sq_is8bit($string) &&
957 ! in_array($default_charset,sq_mb_list_encodings())) {
958 // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
959 // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
960 }
961
962 // Encode only if the string contains 8-bit characters or =?
963 $j = strlen($string);
964 $max_l = 75 - strlen($default_charset) - 7;
965 $aRet = array();
966 $ret = '';
967 $iEncStart = $enc_init = false;
968 $cur_l = $iOffset = 0;
969 for($i = 0; $i < $j; ++$i) {
970 switch($string{$i})
971 {
972 case '"':
973 case '=':
974 case '<':
975 case '>':
976 case ',':
977 case '?':
978 case '_':
979 if ($iEncStart === false) {
980 $iEncStart = $i;
981 }
982 $cur_l+=3;
983 if ($cur_l > ($max_l-2)) {
984 /* if there is an stringpart that doesn't need encoding, add it */
985 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
986 $aRet[] = "=?$default_charset?Q?$ret?=";
987 $iOffset = $i;
988 $cur_l = 0;
989 $ret = '';
990 $iEncStart = false;
991 } else {
992 $ret .= sprintf("=%02X",ord($string{$i}));
993 }
994 break;
995 case '(':
996 case ')':
997 if ($iEncStart !== false) {
998 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
999 $aRet[] = "=?$default_charset?Q?$ret?=";
1000 $iOffset = $i;
1001 $cur_l = 0;
1002 $ret = '';
1003 $iEncStart = false;
1004 }
1005 break;
1006 case ' ':
1007 if ($iEncStart !== false) {
1008 $cur_l++;
1009 if ($cur_l > $max_l) {
1010 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1011 $aRet[] = "=?$default_charset?Q?$ret?=";
1012 $iOffset = $i;
1013 $cur_l = 0;
1014 $ret = '';
1015 $iEncStart = false;
1016 } else {
1017 $ret .= '_';
1018 }
1019 }
1020 break;
1021 default:
1022 $k = ord($string{$i});
1023 if ($k > 126) {
1024 if ($iEncStart === false) {
1025 // do not start encoding in the middle of a string, also take the rest of the word.
1026 $sLeadString = substr($string,0,$i);
1027 $aLeadString = explode(' ',$sLeadString);
1028 $sToBeEncoded = array_pop($aLeadString);
1029 $iEncStart = $i - strlen($sToBeEncoded);
1030 $ret .= $sToBeEncoded;
1031 $cur_l += strlen($sToBeEncoded);
1032 }
1033 $cur_l += 3;
1034 /* first we add the encoded string that reached it's max size */
1035 if ($cur_l > ($max_l-2)) {
1036 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1037 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
1038 $cur_l = 3;
1039 $ret = '';
1040 $iOffset = $i;
1041 $iEncStart = $i;
1042 }
1043 $enc_init = true;
1044 $ret .= sprintf("=%02X", $k);
1045 } else {
1046 if ($iEncStart !== false) {
1047 $cur_l++;
1048 if ($cur_l > $max_l) {
1049 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1050 $aRet[] = "=?$default_charset?Q?$ret?=";
1051 $iEncStart = false;
1052 $iOffset = $i;
1053 $cur_l = 0;
1054 $ret = '';
1055 } else {
1056 $ret .= $string{$i};
1057 }
1058 }
1059 }
1060 break;
1061 }
1062 }
1063
1064 if ($enc_init) {
1065 if ($iEncStart !== false) {
1066 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1067 $aRet[] = "=?$default_charset?Q?$ret?=";
1068 } else {
1069 $aRet[] = substr($string,$iOffset);
1070 }
1071 $string = implode('',$aRet);
1072 }
1073 return $string;
1074 }
1075
1076 /**
1077 * Encodes string according to rfc2047 B encoding header formating rules
1078 *
1079 * It is recommended way to encode headers with character sets that store
1080 * symbols in more than one byte.
1081 *
1082 * Function requires mbstring support. If required mbstring functions are missing,
1083 * function returns false and sets E_USER_WARNING level error message.
1084 *
1085 * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1086 * that mbstring functions will generate E_WARNING errors, if unsupported
1087 * character set is used. mb_encode_mimeheader function provided by php
1088 * mbstring extension is not used in order to get better control of header
1089 * encoding.
1090 *
1091 * Used php code functions - function_exists(), trigger_error(), strlen()
1092 * (is used with charset names and base64 strings). Used php mbstring
1093 * functions - mb_strlen and mb_substr.
1094 *
1095 * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
1096 * encoding), rfc 2822 (header folding)
1097 *
1098 * @param string $string header string that must be encoded
1099 * @param string $charset character set. Must be supported by mbstring extension.
1100 * Use sq_mb_list_encodings() to detect supported charsets.
1101 * @return string string encoded according to rfc2047 B encoding formating rules
1102 * @since 1.5.1
1103 * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1104 * @todo Do we want to control max length of header?
1105 * @todo Do we want to control EOL (end-of-line) marker?
1106 * @todo Do we want to translate error message?
1107 */
1108 function encodeHeaderBase64($string,$charset) {
1109 /**
1110 * Check mbstring function requirements.
1111 */
1112 if (! function_exists('mb_strlen') ||
1113 ! function_exists('mb_substr')) {
1114 // set E_USER_WARNING
1115 trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1116 // return false
1117 return false;
1118 }
1119
1120 // initial return array
1121 $aRet = array();
1122
1123 /**
1124 * header length = 75 symbols max (same as in encodeHeader)
1125 * remove $charset length
1126 * remove =? ? ?= (5 chars)
1127 * remove 2 more chars (\r\n ?)
1128 */
1129 $iMaxLength = 75 - strlen($charset) - 7;
1130
1131 // set first character position
1132 $iStartCharNum = 0;
1133
1134 // loop through all characters. count characters and not bytes.
1135 for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1136 // encode string from starting character to current character.
1137 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1138
1139 // Check encoded string length
1140 if(strlen($encoded_string)>$iMaxLength) {
1141 // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1142 $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1143
1144 // set new starting character
1145 $iStartCharNum = $iCharNum-1;
1146
1147 // encode last char (in case it is last character in string)
1148 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1149 } // if string is shorter than max length - add next character
1150 }
1151
1152 // add last encoded string to array
1153 $aRet[] = $encoded_string;
1154
1155 // set initial return string
1156 $sRet = '';
1157
1158 // loop through encoded strings
1159 foreach($aRet as $string) {
1160 // TODO: Do we want to control EOL (end-of-line) marker
1161 if ($sRet!='') $sRet.= " ";
1162
1163 // add header tags and encoded string to return string
1164 $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1165 }
1166
1167 return $sRet;
1168 }
1169
1170 /* This function trys to locate the entity_id of a specific mime element */
1171 function find_ent_id($id, $message) {
1172 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1173 if ($message->entities[$i]->header->type0 == 'multipart') {
1174 $ret = find_ent_id($id, $message->entities[$i]);
1175 } else {
1176 if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
1177 // if (sq_check_save_extension($message->entities[$i])) {
1178 return $message->entities[$i]->entity_id;
1179 // }
1180 } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1181 /**
1182 * This is part of a fix for Outlook Express 6.x generating
1183 * cid URLs without creating content-id headers
1184 * @@JA - 20050207
1185 */
1186 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1187 return $message->entities[$i]->entity_id;
1188 }
1189 }
1190 }
1191 }
1192 return $ret;
1193 }
1194
1195 function sq_check_save_extension($message) {
1196 $filename = $message->getFilename();
1197 $ext = substr($filename, strrpos($filename,'.')+1);
1198 $save_extensions = array('jpg','jpeg','gif','png','bmp');
1199 return in_array($ext, $save_extensions);
1200 }
1201
1202
1203 /**
1204 ** HTMLFILTER ROUTINES
1205 */
1206
1207 /**
1208 * This function checks attribute values for entity-encoded values
1209 * and returns them translated into 8-bit strings so we can run
1210 * checks on them.
1211 *
1212 * @param $attvalue A string to run entity check against.
1213 * @return Nothing, modifies a reference value.
1214 */
1215 function sq_defang(&$attvalue){
1216 $me = 'sq_defang';
1217 /**
1218 * Skip this if there aren't ampersands or backslashes.
1219 */
1220 if (strpos($attvalue, '&') === false
1221 && strpos($attvalue, '\\') === false){
1222 return;
1223 }
1224 $m = false;
1225 // before deent, translate the dangerous unicode characters and ... to safe values
1226 // otherwise the regular expressions do not match.
1227
1228
1229
1230 do {
1231 $m = false;
1232 $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1233 $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1234 $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1235 } while ($m == true);
1236 $attvalue = stripslashes($attvalue);
1237 }
1238
1239 /**
1240 * Kill any tabs, newlines, or carriage returns. Our friends the
1241 * makers of the browser with 95% market value decided that it'd
1242 * be funny to make "java[tab]script" be just as good as "javascript".
1243 *
1244 * @param attvalue The attribute value before extraneous spaces removed.
1245 * @return attvalue Nothing, modifies a reference value.
1246 */
1247 function sq_unspace(&$attvalue){
1248 $me = 'sq_unspace';
1249 if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1250 $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1251 Array('', '', '', '', ''), $attvalue);
1252 }
1253 }
1254
1255 /**
1256 * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
1257 * IE as regular characters.
1258 *
1259 * @param attvalue The attribute value before dangerous characters are translated.
1260 * @return attvalue Nothing, modifies a reference value.
1261 * @author Marc Groot Koerkamp.
1262 */
1263 function sq_fixIE_idiocy(&$attvalue) {
1264 // remove NUL
1265 $attvalue = str_replace("\0", "", $attvalue);
1266 // remove comments
1267 $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1268
1269 // IE has the evil habit of accepting every possible value for the attribute expression.
1270 // The table below contains characters which are parsed by IE if they are used in the "expression"
1271 // attribute value.
1272 $aDangerousCharsReplacementTable = array(
1273 array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1274 '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1275 '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
1276 '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1277 '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
1278 '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1279 '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1280 '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1281 '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1282 '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1283 '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1284 '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1285 '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1286 '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1287 '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1288 '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1289 '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1290 '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1291 '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1292 '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1293 '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1294 '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1295 '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1296 '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
1297 "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range
1298 "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1299 "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1300 "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1301 "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1302 "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1303 "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1304 "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1305 "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1306 "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1307 "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1308 "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1309 "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1310 "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1311 "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1312 "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1313 "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1314 "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1315 "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1316 "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1317 "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1318 "\xCA\x9F", /* L UNICODE IPA Extension */
1319 "\xCA\x80", /* R UNICODE IPA Extension */
1320 "\xC9\xB4"), /* N UNICODE IPA Extension */
1321 array('l', 'l', 'r','r','n','n',
1322 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1323 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1324 'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
1325 $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1326
1327 // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1328 // used for XSS.
1329 $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1330 }
1331
1332 /**
1333 * This function returns the final tag out of the tag name, an array
1334 * of attributes, and the type of the tag. This function is called by
1335 * sq_sanitize internally.
1336 *
1337 * @param $tagname the name of the tag.
1338 * @param $attary the array of attributes and their values
1339 * @param $tagtype The type of the tag (see in comments).
1340 * @return a string with the final tag representation.
1341 */
1342 function sq_tagprint($tagname, $attary, $tagtype){
1343 $me = 'sq_tagprint';
1344
1345 if ($tagtype == 2){
1346 $fulltag = '</' . $tagname . '>';
1347 } else {
1348 $fulltag = '<' . $tagname;
1349 if (is_array($attary) && sizeof($attary)){
1350 $atts = Array();
1351 while (list($attname, $attvalue) = each($attary)){
1352 array_push($atts, "$attname=$attvalue");
1353 }
1354 $fulltag .= ' ' . join(" ", $atts);
1355 }
1356 if ($tagtype == 3){
1357 $fulltag .= ' /';
1358 }
1359 $fulltag .= '>';
1360 }
1361 return $fulltag;
1362 }
1363
1364 /**
1365 * A small helper function to use with array_walk. Modifies a by-ref
1366 * value and makes it lowercase.
1367 *
1368 * @param $val a value passed by-ref.
1369 * @return void since it modifies a by-ref value.
1370 */
1371 function sq_casenormalize(&$val){
1372 $val = strtolower($val);
1373 }
1374
1375 /**
1376 * This function skips any whitespace from the current position within
1377 * a string and to the next non-whitespace value.
1378 *
1379 * @param $body the string
1380 * @param $offset the offset within the string where we should start
1381 * looking for the next non-whitespace character.
1382 * @return the location within the $body where the next
1383 * non-whitespace char is located.
1384 */
1385 function sq_skipspace($body, $offset){
1386 $me = 'sq_skipspace';
1387 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
1388 if (sizeof($matches{1})){
1389 $count = strlen($matches{1});
1390 $offset += $count;
1391 }
1392 return $offset;
1393 }
1394
1395 /**
1396 * This function looks for the next character within a string. It's
1397 * really just a glorified "strpos", except it catches if failures
1398 * nicely.
1399 *
1400 * @param $body The string to look for needle in.
1401 * @param $offset Start looking from this position.
1402 * @param $needle The character/string to look for.
1403 * @return location of the next occurance of the needle, or
1404 * strlen($body) if needle wasn't found.
1405 */
1406 function sq_findnxstr($body, $offset, $needle){
1407 $me = 'sq_findnxstr';
1408 $pos = strpos($body, $needle, $offset);
1409 if ($pos === FALSE){
1410 $pos = strlen($body);
1411 }
1412 return $pos;
1413 }
1414
1415 /**
1416 * This function takes a PCRE-style regexp and tries to match it
1417 * within the string.
1418 *
1419 * @param $body The string to look for needle in.
1420 * @param $offset Start looking from here.
1421 * @param $reg A PCRE-style regex to match.
1422 * @return Returns a false if no matches found, or an array
1423 * with the following members:
1424 * - integer with the location of the match within $body
1425 * - string with whatever content between offset and the match
1426 * - string with whatever it is we matched
1427 */
1428 function sq_findnxreg($body, $offset, $reg){
1429 $me = 'sq_findnxreg';
1430 $matches = Array();
1431 $retarr = Array();
1432 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1433 if (!isset($matches{0}) || !$matches{0}){
1434 $retarr = false;
1435 } else {
1436 $retarr{0} = $offset + strlen($matches{1});
1437 $retarr{1} = $matches{1};
1438 $retarr{2} = $matches{2};
1439 }
1440 return $retarr;
1441 }
1442
1443 /**
1444 * This function looks for the next tag.
1445 *
1446 * @param $body String where to look for the next tag.
1447 * @param $offset Start looking from here.
1448 * @return false if no more tags exist in the body, or
1449 * an array with the following members:
1450 * - string with the name of the tag
1451 * - array with attributes and their values
1452 * - integer with tag type (1, 2, or 3)
1453 * - integer where the tag starts (starting "<")
1454 * - integer where the tag ends (ending ">")
1455 * first three members will be false, if the tag is invalid.
1456 */
1457 function sq_getnxtag($body, $offset){
1458 $me = 'sq_getnxtag';
1459 if ($offset > strlen($body)){
1460 return false;
1461 }
1462 $lt = sq_findnxstr($body, $offset, "<");
1463 if ($lt == strlen($body)){
1464 return false;
1465 }
1466 /**
1467 * We are here:
1468 * blah blah <tag attribute="value">
1469 * \---------^
1470 */
1471 $pos = sq_skipspace($body, $lt+1);
1472 if ($pos >= strlen($body)){
1473 return Array(false, false, false, $lt, strlen($body));
1474 }
1475 /**
1476 * There are 3 kinds of tags:
1477 * 1. Opening tag, e.g.:
1478 * <a href="blah">
1479 * 2. Closing tag, e.g.:
1480 * </a>
1481 * 3. XHTML-style content-less tag, e.g.:
1482 * <img src="blah" />
1483 */
1484 $tagtype = false;
1485 switch (substr($body, $pos, 1)){
1486 case '/':
1487 $tagtype = 2;
1488 $pos++;
1489 break;
1490 case '!':
1491 /**
1492 * A comment or an SGML declaration.
1493 */
1494 if (substr($body, $pos+1, 2) == "--"){
1495 $gt = strpos($body, "-->", $pos);
1496 if ($gt === false){
1497 $gt = strlen($body);
1498 } else {
1499 $gt += 2;
1500 }
1501 return Array(false, false, false, $lt, $gt);
1502 } else {
1503 $gt = sq_findnxstr($body, $pos, ">");
1504 return Array(false, false, false, $lt, $gt);
1505 }
1506 break;
1507 default:
1508 /**
1509 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1510 * later.
1511 */
1512 $tagtype = 1;
1513 break;
1514 }
1515
1516 $tag_start = $pos;
1517 $tagname = '';
1518 /**
1519 * Look for next [\W-_], which will indicate the end of the tag name.
1520 */
1521 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1522 if ($regary == false){
1523 return Array(false, false, false, $lt, strlen($body));
1524 }
1525 list($pos, $tagname, $match) = $regary;
1526 $tagname = strtolower($tagname);
1527
1528 /**
1529 * $match can be either of these:
1530 * '>' indicating the end of the tag entirely.
1531 * '\s' indicating the end of the tag name.
1532 * '/' indicating that this is type-3 xhtml tag.
1533 *
1534 * Whatever else we find there indicates an invalid tag.
1535 */
1536 switch ($match){
1537 case '/':
1538 /**
1539 * This is an xhtml-style tag with a closing / at the
1540 * end, like so: <img src="blah" />. Check if it's followed
1541 * by the closing bracket. If not, then this tag is invalid
1542 */
1543 if (substr($body, $pos, 2) == "/>"){
1544 $pos++;
1545 $tagtype = 3;
1546 } else {
1547 $gt = sq_findnxstr($body, $pos, ">");
1548 $retary = Array(false, false, false, $lt, $gt);
1549 return $retary;
1550 }
1551 case '>':
1552 return Array($tagname, false, $tagtype, $lt, $pos);
1553 break;
1554 default:
1555 /**
1556 * Check if it's whitespace
1557 */
1558 if (!preg_match('/\s/', $match)){
1559 /**
1560 * This is an invalid tag! Look for the next closing ">".
1561 */
1562 $gt = sq_findnxstr($body, $lt, ">");
1563 return Array(false, false, false, $lt, $gt);
1564 }
1565 break;
1566 }
1567
1568 /**
1569 * At this point we're here:
1570 * <tagname attribute='blah'>
1571 * \-------^
1572 *
1573 * At this point we loop in order to find all attributes.
1574 */
1575 $attname = '';
1576 $atttype = false;
1577 $attary = Array();
1578
1579 while ($pos <= strlen($body)){
1580 $pos = sq_skipspace($body, $pos);
1581 if ($pos == strlen($body)){
1582 /**
1583 * Non-closed tag.
1584 */
1585 return Array(false, false, false, $lt, $pos);
1586 }
1587 /**
1588 * See if we arrived at a ">" or "/>", which means that we reached
1589 * the end of the tag.
1590 */
1591 $matches = Array();
1592 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
1593 /**
1594 * Yep. So we did.
1595 */
1596 $pos += strlen($matches{1});
1597 if ($matches{2} == "/>"){
1598 $tagtype = 3;
1599 $pos++;
1600 }
1601 return Array($tagname, $attary, $tagtype, $lt, $pos);
1602 }
1603
1604 /**
1605 * There are several types of attributes, with optional
1606 * [:space:] between members.
1607 * Type 1:
1608 * attrname[:space:]=[:space:]'CDATA'
1609 * Type 2:
1610 * attrname[:space:]=[:space:]"CDATA"
1611 * Type 3:
1612 * attr[:space:]=[:space:]CDATA
1613 * Type 4:
1614 * attrname
1615 *
1616 * We leave types 1 and 2 the same, type 3 we check for
1617 * '"' and convert to "&quot" if needed, then wrap in
1618 * double quotes. Type 4 we convert into:
1619 * attrname="yes".
1620 */
1621 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
1622 if ($regary == false){
1623 /**
1624 * Looks like body ended before the end of tag.
1625 */
1626 return Array(false, false, false, $lt, strlen($body));
1627 }
1628 list($pos, $attname, $match) = $regary;
1629 $attname = strtolower($attname);
1630 /**
1631 * We arrived at the end of attribute name. Several things possible
1632 * here:
1633 * '>' means the end of the tag and this is attribute type 4
1634 * '/' if followed by '>' means the same thing as above
1635 * '\s' means a lot of things -- look what it's followed by.
1636 * anything else means the attribute is invalid.
1637 */
1638 switch($match){
1639 case '/':
1640 /**
1641 * This is an xhtml-style tag with a closing / at the
1642 * end, like so: <img src="blah" />. Check if it's followed
1643 * by the closing bracket. If not, then this tag is invalid
1644 */
1645 if (substr($body, $pos, 2) == "/>"){
1646 $pos++;
1647 $tagtype = 3;
1648 } else {
1649 $gt = sq_findnxstr($body, $pos, ">");
1650 $retary = Array(false, false, false, $lt, $gt);
1651 return $retary;
1652 }
1653 case '>':
1654 $attary{$attname} = '"yes"';
1655 return Array($tagname, $attary, $tagtype, $lt, $pos);
1656 break;
1657 default:
1658 /**
1659 * Skip whitespace and see what we arrive at.
1660 */
1661 $pos = sq_skipspace($body, $pos);
1662 $char = substr($body, $pos, 1);
1663 /**
1664 * Two things are valid here:
1665 * '=' means this is attribute type 1 2 or 3.
1666 * \w means this was attribute type 4.
1667 * anything else we ignore and re-loop. End of tag and
1668 * invalid stuff will be caught by our checks at the beginning
1669 * of the loop.
1670 */
1671 if ($char == "="){
1672 $pos++;
1673 $pos = sq_skipspace($body, $pos);
1674 /**
1675 * Here are 3 possibilities:
1676 * "'" attribute type 1
1677 * '"' attribute type 2
1678 * everything else is the content of tag type 3
1679 */
1680 $quot = substr($body, $pos, 1);
1681 if ($quot == "'"){
1682 $regary = sq_findnxreg($body, $pos+1, "\'");
1683 if ($regary == false){
1684 return Array(false, false, false, $lt, strlen($body));
1685 }
1686 list($pos, $attval, $match) = $regary;
1687 $pos++;
1688 $attary{$attname} = "'" . $attval . "'";
1689 } else if ($quot == '"'){
1690 $regary = sq_findnxreg($body, $pos+1, '\"');
1691 if ($regary == false){
1692 return Array(false, false, false, $lt, strlen($body));
1693 }
1694 list($pos, $attval, $match) = $regary;
1695 $pos++;
1696 $attary{$attname} = '"' . $attval . '"';
1697 } else {
1698 /**
1699 * These are hateful. Look for \s, or >.
1700 */
1701 $regary = sq_findnxreg($body, $pos, "[\s>]");
1702 if ($regary == false){
1703 return Array(false, false, false, $lt, strlen($body));
1704 }
1705 list($pos, $attval, $match) = $regary;
1706 /**
1707 * If it's ">" it will be caught at the top.
1708 */
1709 $attval = preg_replace("/\"/s", "&quot;", $attval);
1710 $attary{$attname} = '"' . $attval . '"';
1711 }
1712 } else if (preg_match("|[\w/>]|", $char)) {
1713 /**
1714 * That was attribute type 4.
1715 */
1716 $attary{$attname} = '"yes"';
1717 } else {
1718 /**
1719 * An illegal character. Find next '>' and return.
1720 */
1721 $gt = sq_findnxstr($body, $pos, ">");
1722 return Array(false, false, false, $lt, $gt);
1723 }
1724 break;
1725 }
1726 }
1727 /**
1728 * The fact that we got here indicates that the tag end was never
1729 * found. Return invalid tag indication so it gets stripped.
1730 */
1731 return Array(false, false, false, $lt, strlen($body));
1732 }
1733
1734 /**
1735 * Translates entities into literal values so they can be checked.
1736 *
1737 * @param $attvalue the by-ref value to check.
1738 * @param $regex the regular expression to check against.
1739 * @param $hex whether the entites are hexadecimal.
1740 * @return True or False depending on whether there were matches.
1741 */
1742 function sq_deent(&$attvalue, $regex, $hex=false){
1743 $me = 'sq_deent';
1744 $ret_match = false;
1745 // remove comments
1746 //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
1747 preg_match_all($regex, $attvalue, $matches);
1748 if (is_array($matches) && sizeof($matches[0]) > 0){
1749 $repl = Array();
1750 for ($i = 0; $i < sizeof($matches[0]); $i++){
1751 $numval = $matches[1][$i];
1752 if ($hex){
1753 $numval = hexdec($numval);
1754 }
1755 $repl{$matches[0][$i]} = chr($numval);
1756 }
1757 $attvalue = strtr($attvalue, $repl);
1758 return true;
1759 } else {
1760 return false;
1761 }
1762 }
1763
1764 /**
1765 * This function runs various checks against the attributes.
1766 *
1767 * @param $tagname String with the name of the tag.
1768 * @param $attary Array with all tag attributes.
1769 * @param $rm_attnames See description for sq_sanitize
1770 * @param $bad_attvals See description for sq_sanitize
1771 * @param $add_attr_to_tag See description for sq_sanitize
1772 * @param $message message object
1773 * @param $id message id
1774 * @return Array with modified attributes.
1775 */
1776 function sq_fixatts($tagname,
1777 $attary,
1778 $rm_attnames,
1779 $bad_attvals,
1780 $add_attr_to_tag,
1781 $message,
1782 $id,
1783 $mailbox
1784 ){
1785 $me = 'sq_fixatts';
1786 while (list($attname, $attvalue) = each($attary)){
1787 /**
1788 * See if this attribute should be removed.
1789 */
1790 foreach ($rm_attnames as $matchtag=>$matchattrs){
1791 if (preg_match($matchtag, $tagname)){
1792 foreach ($matchattrs as $matchattr){
1793 if (preg_match($matchattr, $attname)){
1794 unset($attary{$attname});
1795 continue;
1796 }
1797 }
1798 }
1799 }
1800 /**
1801 * Workaround for IE quirks
1802 */
1803 sq_fixIE_idiocy($attvalue);
1804
1805 /**
1806 * Remove any backslashes, entities, and extraneous whitespace.
1807 */
1808
1809 $oldattvalue = $attvalue;
1810 sq_defang($attvalue);
1811 if ($attname == 'style' && $attvalue !== $oldattvalue) {
1812 // entities are used in the attribute value. In 99% of the cases it's there as XSS
1813 // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1814 $attvalue = "idiocy";
1815 $attary{$attname} = $attvalue;
1816 }
1817 sq_unspace($attvalue);
1818
1819 /**
1820 * Now let's run checks on the attvalues.
1821 * I don't expect anyone to comprehend this. If you do,
1822 * get in touch with me so I can drive to where you live and
1823 * shake your hand personally. :)
1824 */
1825 foreach ($bad_attvals as $matchtag=>$matchattrs){
1826 if (preg_match($matchtag, $tagname)){
1827 foreach ($matchattrs as $matchattr=>$valary){
1828 if (preg_match($matchattr, $attname)){
1829 /**
1830 * There are two arrays in valary.
1831 * First is matches.
1832 * Second one is replacements
1833 */
1834 list($valmatch, $valrepl) = $valary;
1835 $newvalue =
1836 preg_replace($valmatch, $valrepl, $attvalue);
1837 if ($newvalue != $attvalue){
1838 $attary{$attname} = $newvalue;
1839 $attvalue = $newvalue;
1840 }
1841 }
1842 }
1843 }
1844 }
1845 if ($attname == 'style') {
1846 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1847 // 8bit and control characters in style attribute values can be used for XSS, remove them
1848 $attary{$attname} = '"disallowed character"';
1849 }
1850 preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1851 if (count($aMatch)) {
1852 foreach($aMatch[1] as $sMatch) {
1853 // url value
1854 $urlvalue = $sMatch;
1855 sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1856 $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1857 }
1858 }
1859 }
1860 /**
1861 * Use white list based filtering on attributes which can contain url's
1862 */
1863 else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
1864 sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1865 $attary{$attname} = $attvalue;
1866 }
1867 }
1868 /**
1869 * See if we need to append any attributes to this tag.
1870 */
1871 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1872 if (preg_match($matchtag, $tagname)){
1873 $attary = array_merge($attary, $addattary);
1874 }
1875 }
1876 return $attary;
1877 }
1878
1879 /**
1880 * This function filters url's
1881 *
1882 * @param $attvalue String with attribute value to filter
1883 * @param $message message object
1884 * @param $id message id
1885 * @param $mailbox mailbox
1886 * @param $sQuote quoting characters around url's
1887 */
1888 function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1889 $attvalue = trim($attvalue);
1890 if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1891 // remove the double quotes
1892 $sQuote = $attvalue[0];
1893 $attvalue = trim(substr($attvalue,1,-1));
1894 }
1895
1896 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
1897 // images off by default.
1898 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
1899
1900 $secremoveimg = '../images/' . _("sec_remove_eng.png");
1901
1902 /**
1903 * Replace empty src tags with the blank image. src is only used
1904 * for frames, images, and image inputs. Doing a replace should
1905 * not affect them working as should be, however it will stop
1906 * IE from being kicked off when src for img tags are not set
1907 */
1908 if ($attvalue == '') {
1909 $attvalue = '"' . SM_PATH . 'images/blank.png"';
1910 } else {
1911 // first, disallow 8 bit characters and control characters
1912 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1913 switch ($attname) {
1914 case 'href':
1915 $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1916 break;
1917 default:
1918 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1919 break;
1920 }
1921 } else {
1922 $aUrl = parse_url($attvalue);
1923 if (isset($aUrl['scheme'])) {
1924 switch(strtolower($aUrl['scheme'])) {
1925 case 'mailto':
1926 case 'http':
1927 case 'https':
1928 case 'ftp':
1929 if ($attname != 'href') {
1930 if ($view_unsafe_images == false) {
1931 $attvalue = $sQuote . $secremoveimg . $sQuote;
1932 } else {
1933 if (isset($aUrl['path'])) {
1934
1935 // No one has been able to show that image URIs
1936 // can be exploited, so for now, no restrictions
1937 // are made at all. If this proves to be a problem,
1938 // the commented-out code below can be of help.
1939 // (One consideration is that I see nothing in this
1940 // function that specifically says that we will
1941 // only ever arrive here when inspecting an image
1942 // tag, although that does seem to be the end
1943 // result - e.g., <script src="..."> where malicious
1944 // image URIs are in fact a problem are already
1945 // filtered out elsewhere.
1946 /* ---------------------------------
1947 // validate image extension.
1948 $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1949 if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
1950 // If URI is to something other than
1951 // a regular image file, get the contents
1952 // and try to see if it is an image.
1953 // Don't use Fileinfo (finfo_file()) because
1954 // we'd need to make the admin configure the
1955 // location of the magic.mime file (FIXME: add finfo_file() support later?)
1956 //
1957 $mime_type = '';
1958 if (function_exists('mime_content_type')
1959 && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
1960
1961 // fetch file
1962 //
1963 $file_contents = '';
1964 while (!feof($FILE)) {
1965 $file_contents .= fread($FILE, 8192);
1966 }
1967 fclose($FILE);
1968
1969 // store file locally
1970 //
1971 global $attachment_dir, $username;
1972 $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
1973 $localfilename = GenerateRandomString(32, '', 7);
1974 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1975 while (file_exists($full_localfilename)) {
1976 $localfilename = GenerateRandomString(32, '', 7);
1977 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1978 }
1979 $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
1980 fwrite($FILE, $file_contents);
1981 fclose($FILE);
1982
1983 // get mime type and remove file
1984 //
1985 $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
1986 unlink("$hashed_attachment_dir/$localfilename");
1987 }
1988 // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
1989 if (substr(strtolower($mime_type), 0, 5) != 'image') {
1990 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1991 }
1992 }
1993 --------------------------------- */
1994 } else {
1995 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1996 }
1997 }
1998 } else {
1999 $attvalue = $sQuote . $attvalue . $sQuote;
2000 }
2001 break;
2002 case 'outbind':
2003 /**
2004 * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
2005 * One day MS might actually make it match something useful, for now, falling
2006 * back to using cid2http, so we can grab the blank.png.
2007 */
2008 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
2009 break;
2010 case 'cid':
2011 /**
2012 * Turn cid: urls into http-friendly ones.
2013 */
2014 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
2015 break;
2016 default:
2017 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2018 break;
2019 }
2020 } else {
2021 if (!isset($aUrl['path']) || $aUrl['path'] != $secremoveimg) {
2022 // parse_url did not lead to satisfying result
2023 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2024 }
2025 }
2026 }
2027 }
2028 }
2029
2030 /**
2031 * This function edits the style definition to make them friendly and
2032 * usable in SquirrelMail.
2033 *
2034 * @param $message the message object
2035 * @param $id the message id
2036 * @param $content a string with whatever is between <style> and </style>
2037 * @param $mailbox the message mailbox
2038 * @return a string with edited content.
2039 */
2040 function sq_fixstyle($body, $pos, $message, $id, $mailbox){
2041 $me = 'sq_fixstyle';
2042 // workaround for </style> in between comments
2043 $iCurrentPos = $pos;
2044 $content = '';
2045 $sToken = '';
2046 $bSucces = false;
2047 $bEndTag = false;
2048 for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
2049 $char = $body{$i};
2050 switch ($char) {
2051 case '<':
2052 $sToken = $char;
2053 break;
2054 case '/':
2055 if ($sToken == '<') {
2056 $sToken .= $char;
2057 $bEndTag = true;
2058 } else {
2059 $content .= $char;
2060 }
2061 break;
2062 case '>':
2063 if ($bEndTag) {
2064 $sToken .= $char;
2065 if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
2066 $newpos = $i + 1;
2067 $bSucces = true;
2068 break 2;
2069 } else {
2070 $content .= $sToken;
2071 }
2072 $bEndTag = false;
2073 } else {
2074 $content .= $char;
2075 }
2076 break;
2077 case '!':
2078 if ($sToken == '<') {
2079 // possible comment
2080 if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
2081 $i = strpos($body,'-->',$i+3);
2082 if ($i === false) { // no end comment
2083 $i = strlen($body);
2084 }
2085 $sToken = '';
2086 }
2087 } else {
2088 $content .= $char;
2089 }
2090 break;
2091 default:
2092 if ($bEndTag) {
2093 $sToken .= $char;
2094 } else {
2095 $content .= $char;
2096 }
2097 break;
2098 }
2099 }
2100 if ($bSucces == FALSE){
2101 return array(FALSE, strlen($body));
2102 }
2103
2104
2105
2106 /**
2107 * First look for general BODY style declaration, which would be
2108 * like so:
2109 * body {background: blah-blah}
2110 * and change it to .bodyclass so we can just assign it to a <div>
2111 */
2112 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
2113 $secremoveimg = '../images/' . _("sec_remove_eng.png");
2114 /**
2115 * Fix url('blah') declarations.
2116 */
2117 // $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
2118 // "url(\\1$secremoveimg\\2)", $content);
2119
2120 // first check for 8bit sequences and disallowed control characters
2121 if (preg_match('/[\16-\37\200-\377]+/',$content)) {
2122 $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
2123 return array($content, $newpos);
2124 }
2125
2126 // IE Sucks hard. We have a special function for it.
2127 sq_fixIE_idiocy($content);
2128
2129 // remove @import line
2130 $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2131
2132 // translate ur\l and variations (IE parses that)
2133 // TODO check if the sq_fixIE_idiocy function already handles this.
2134 $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
2135 preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2136 if (count($aMatch)) {
2137 $aValue = $aReplace = array();
2138 foreach($aMatch[1] as $sMatch) {
2139 // url value
2140 $urlvalue = $sMatch;
2141 sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2142 $aValue[] = $sMatch;
2143 $aReplace[] = $urlvalue;
2144 }
2145 $content = str_replace($aValue,$aReplace,$content);
2146 }
2147
2148 /**
2149 * Remove any backslashes, entities, and extraneous whitespace.
2150 */
2151 $contentTemp = $content;
2152 sq_defang($contentTemp);
2153 sq_unspace($contentTemp);
2154
2155 /**
2156 * Fix stupid css declarations which lead to vulnerabilities
2157 * in IE.
2158 *
2159 * Also remove "position" attribute, as it can easily be set
2160 * to "fixed" or "absolute" with "left" and "top" attributes
2161 * of zero, taking over the whole content frame. It can also
2162 * be set to relative and move itself anywhere it wants to,
2163 * displaying content in areas it shouldn't be allowed to touch.
2164 */
2165 $match = Array('/\/\*.*\*\//',
2166 '/expression/i',
2167 '/behaviou*r/i',
2168 '/binding/i',
2169 '/include-source/i',
2170 '/javascript/i',
2171 '/script/i',
2172 '/position/i');
2173 $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
2174 $contentNew = preg_replace($match, $replace, $contentTemp);
2175 if ($contentNew !== $contentTemp) {
2176 // insecure css declarations are used. From now on we don't care
2177 // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2178 $content = $contentNew;
2179 }
2180 return array($content, $newpos);
2181 }
2182
2183
2184 /**
2185 * This function converts cid: url's into the ones that can be viewed in
2186 * the browser.
2187 *
2188 * @param $message the message object
2189 * @param $id the message id
2190 * @param $cidurl the cid: url.
2191 * @param $mailbox the message mailbox
2192 * @return a string with a http-friendly url
2193 */
2194 function sq_cid2http($message, $id, $cidurl, $mailbox){
2195 /**
2196 * Get rid of quotes.
2197 */
2198 $quotchar = substr($cidurl, 0, 1);
2199 if ($quotchar == '"' || $quotchar == "'"){
2200 $cidurl = str_replace($quotchar, "", $cidurl);
2201 } else {
2202 $quotchar = '';
2203 }
2204 $cidurl = substr(trim($cidurl), 4);
2205
2206 $match_str = '/\{.*?\}\//';
2207 $str_rep = '';
2208 $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2209
2210 $linkurl = find_ent_id($cidurl, $message);
2211 /* in case of non-safe cid links $httpurl should be replaced by a sort of
2212 unsafe link image */
2213 $httpurl = '';
2214
2215 /**
2216 * This is part of a fix for Outlook Express 6.x generating
2217 * cid URLs without creating content-id headers. These images are
2218 * not part of the multipart/related html mail. The html contains
2219 * <img src="cid:{some_id}/image_filename.ext"> references to
2220 * attached images with as goal to render them inline although
2221 * the attachment disposition property is not inline.
2222 */
2223
2224 if (empty($linkurl)) {
2225 if (preg_match('/{.*}\//', $cidurl)) {
2226 $cidurl = preg_replace('/{.*}\//','', $cidurl);
2227 if (!empty($cidurl)) {
2228 $linkurl = find_ent_id($cidurl, $message);
2229 }
2230 }
2231 }
2232
2233 if (!empty($linkurl)) {
2234 $httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&amp;' .
2235 "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2236 '&amp;ent_id=' . $linkurl . $quotchar;
2237 } else {
2238 /**
2239 * If we couldn't generate a proper img url, drop in a blank image
2240 * instead of sending back empty, otherwise it causes unusual behaviour
2241 */
2242 $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
2243 }
2244
2245 return $httpurl;
2246 }
2247
2248 /**
2249 * This function changes the <body> tag into a <div> tag since we
2250 * can't really have a body-within-body.
2251 *
2252 * @param $attary an array of attributes and values of <body>
2253 * @param $mailbox mailbox we're currently reading (for cid2http)
2254 * @param $message current message (for cid2http)
2255 * @param $id current message id (for cid2http)
2256 * @return a modified array of attributes to be set for <div>
2257 */
2258 function sq_body2div($attary, $mailbox, $message, $id){
2259 $me = 'sq_body2div';
2260 $divattary = Array('class' => "'bodyclass'");
2261 $text = '#000000';
2262 $has_bgc_stl = $has_txt_stl = false;
2263 $styledef = '';
2264 if (is_array($attary) && sizeof($attary) > 0){
2265 foreach ($attary as $attname=>$attvalue){
2266 $quotchar = substr($attvalue, 0, 1);
2267 $attvalue = str_replace($quotchar, "", $attvalue);
2268 switch ($attname){
2269 case 'background':
2270 $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
2271 $styledef .= "background-image: url('$attvalue'); ";
2272 break;
2273 case 'bgcolor':
2274 $has_bgc_stl = true;
2275 $styledef .= "background-color: $attvalue; ";
2276 break;
2277 case 'text':
2278 $has_txt_stl = true;
2279 $styledef .= "color: $attvalue; ";
2280 break;
2281 }
2282 }
2283 // Outlook defines a white bgcolor and no text color. This can lead to
2284 // white text on a white bg with certain themes.
2285 if ($has_bgc_stl && !$has_txt_stl) {
2286 $styledef .= "color: $text; ";
2287 }
2288 if (strlen($styledef) > 0){
2289 $divattary{"style"} = "\"$styledef\"";
2290 }
2291 }
2292 return $divattary;
2293 }
2294
2295 /**
2296 * This is the main function and the one you should actually be calling.
2297 * There are several variables you should be aware of an which need
2298 * special description.
2299 *
2300 * Since the description is quite lengthy, see it here:
2301 * http://linux.duke.edu/projects/mini/htmlfilter/
2302 *
2303 * @param $body the string with HTML you wish to filter
2304 * @param $tag_list see description above
2305 * @param $rm_tags_with_content see description above
2306 * @param $self_closing_tags see description above
2307 * @param $force_tag_closing see description above
2308 * @param $rm_attnames see description above
2309 * @param $bad_attvals see description above
2310 * @param $add_attr_to_tag see description above
2311 * @param $message message object
2312 * @param $id message id
2313 * @return sanitized html safe to show on your pages.
2314 */
2315 function sq_sanitize($body,
2316 $tag_list,
2317 $rm_tags_with_content,
2318 $self_closing_tags,
2319 $force_tag_closing,
2320 $rm_attnames,
2321 $bad_attvals,
2322 $add_attr_to_tag,
2323 $message,
2324 $id,
2325 $mailbox
2326 ){
2327 $me = 'sq_sanitize';
2328 $rm_tags = array_shift($tag_list);
2329 /**
2330 * Normalize rm_tags and rm_tags_with_content.
2331 */
2332 @array_walk($tag_list, 'sq_casenormalize');
2333 @array_walk($rm_tags_with_content, 'sq_casenormalize');
2334 @array_walk($self_closing_tags, 'sq_casenormalize');
2335 /**
2336 * See if tag_list is of tags to remove or tags to allow.
2337 * false means remove these tags
2338 * true means allow these tags
2339 */
2340 $curpos = 0;
2341 $open_tags = Array();
2342 $trusted = "\n<!-- begin sanitized html -->\n";
2343 $skip_content = false;
2344 /**
2345 * Take care of netscape's stupid javascript entities like
2346 * &{alert('boo')};
2347 */
2348 $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
2349
2350 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
2351 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
2352 $free_content = substr($body, $curpos, $lt-$curpos);
2353 /**
2354 * Take care of <style>
2355 */
2356 if ($tagname == "style" && $tagtype == 1){
2357 list($free_content, $curpos) =
2358 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
2359 if ($free_content != FALSE){
2360 if ( !empty($attary) ) {
2361 $attary = sq_fixatts($tagname,
2362 $attary,
2363 $rm_attnames,
2364 $bad_attvals,
2365 $add_attr_to_tag,
2366 $message,
2367 $id,
2368 $mailbox
2369 );
2370 }
2371 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2372 $trusted .= $free_content;
2373 $trusted .= sq_tagprint($tagname, false, 2);
2374 }
2375 continue;
2376 }
2377 if ($skip_content == false){
2378 $trusted .= $free_content;
2379 }
2380 if ($tagname != FALSE){
2381 if ($tagtype == 2){
2382 if ($skip_content == $tagname){
2383 /**
2384 * Got to the end of tag we needed to remove.
2385 */
2386 $tagname = false;
2387 $skip_content = false;
2388 } else {
2389 if ($skip_content == false){
2390 if ($tagname == "body"){
2391 $tagname = "div";
2392 }
2393 if (isset($open_tags{$tagname}) &&
2394 $open_tags{$tagname} > 0){
2395 $open_tags{$tagname}--;
2396 } else {
2397 $tagname = false;
2398 }
2399 }
2400 }
2401 } else {
2402 /**
2403 * $rm_tags_with_content
2404 */
2405 if ($skip_content == false){
2406 /**
2407 * See if this is a self-closing type and change
2408 * tagtype appropriately.
2409 */
2410 if ($tagtype == 1
2411 && in_array($tagname, $self_closing_tags)){
2412 $tagtype = 3;
2413 }
2414 /**
2415 * See if we should skip this tag and any content
2416 * inside it.
2417 */
2418 if ($tagtype == 1 &&
2419 in_array($tagname, $rm_tags_with_content)){
2420 $skip_content = $tagname;
2421 } else {
2422 if (($rm_tags == false
2423 && in_array($tagname, $tag_list)) ||
2424 ($rm_tags == true &&
2425 !in_array($tagname, $tag_list))){
2426 $tagname = false;
2427 } else {
2428 /**
2429 * Convert body into div.
2430 */
2431 if ($tagname == "body"){
2432 $tagname = "div";
2433 $attary = sq_body2div($attary, $mailbox,
2434 $message, $id);
2435 }
2436 if ($tagtype == 1){
2437 if (isset($open_tags{$tagname})){
2438 $open_tags{$tagname}++;
2439 } else {
2440 $open_tags{$tagname}=1;
2441 }
2442 }
2443 /**
2444 * This is where we run other checks.
2445 */
2446 if (is_array($attary) && sizeof($attary) > 0){
2447 $attary = sq_fixatts($tagname,
2448 $attary,
2449 $rm_attnames,
2450 $bad_attvals,
2451 $add_attr_to_tag,
2452 $message,
2453 $id,
2454 $mailbox
2455 );
2456 }
2457 }
2458 }
2459 }
2460 }
2461 if ($tagname != false && $skip_content == false){
2462 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2463 }
2464 }
2465 $curpos = $gt+1;
2466 }
2467 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2468 if ($force_tag_closing == true){
2469 foreach ($open_tags as $tagname=>$opentimes){
2470 while ($opentimes > 0){
2471 $trusted .= '</' . $tagname . '>';
2472 $opentimes--;
2473 }
2474 }
2475 $trusted .= "\n";
2476 }
2477 $trusted .= "<!-- end sanitized html -->\n";
2478 return $trusted;
2479 }
2480
2481 /**
2482 * This is a wrapper function to call html sanitizing routines.
2483 *
2484 * @param $body the body of the message
2485 * @param $id the id of the message
2486
2487 * @param $message
2488 * @param $mailbox
2489 * @param boolean $take_mailto_links When TRUE, converts mailto: links
2490 * into internal SM compose links
2491 * (optional; default = TRUE)
2492 * @return a string with html safe to display in the browser.
2493 */
2494 function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2495
2496 // require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
2497
2498 global $attachment_common_show_images, $view_unsafe_images,
2499 $has_unsafe_images;
2500 /**
2501 * Don't display attached images in HTML mode.
2502 *
2503 * SB: why?
2504 */
2505 $attachment_common_show_images = false;
2506 $tag_list = Array(
2507 false,
2508 "object",
2509 "meta",
2510 "html",
2511 "head",
2512 "base",
2513 "link",
2514 "frame",
2515 "iframe",
2516 "plaintext",
2517 "marquee"
2518 );
2519
2520 $rm_tags_with_content = Array(
2521 "script",
2522 "applet",
2523 "embed",
2524 "title",
2525 "frameset",
2526 "xmp",
2527 "xml"
2528 );
2529
2530 $self_closing_tags = Array(
2531 "img",
2532 "br",
2533 "hr",
2534 "input",
2535 "outbind"
2536 );
2537
2538 $force_tag_closing = true;
2539
2540 $rm_attnames = Array(
2541 "/.*/" =>
2542 Array(
2543 "/target/i",
2544 "/^on.*/i",
2545 "/^dynsrc/i",
2546 "/^data.*/i",
2547 "/^lowsrc.*/i"
2548 )
2549 );
2550
2551 $secremoveimg = "../images/" . _("sec_remove_eng.png");
2552 $bad_attvals = Array(
2553 "/.*/" =>
2554 Array(
2555 "/^src|background/i" =>
2556 Array(
2557 Array(
2558 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2559 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2560 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2561 ),
2562 Array(
2563 "\\1$secremoveimg\\2",
2564 "\\1$secremoveimg\\2",
2565 "\\1$secremoveimg\\2",
2566 )
2567 ),
2568 "/^href|action/i" =>
2569 Array(
2570 Array(
2571 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2572 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2573 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
2574 ),
2575 Array(
2576 "\\1#\\1",
2577 "\\1#\\1",
2578 "\\1#\\1"
2579 )
2580 ),
2581 "/^style/i" =>
2582 Array(
2583 Array(
2584 "/\/\*.*\*\//",
2585 "/expression/i",
2586 "/binding/i",
2587 "/behaviou*r/i",
2588 "/include-source/i",
2589
2590 // position:relative can also be exploited
2591 // to put content outside of email body area
2592 // and position:fixed is similarly exploitable
2593 // as position:absolute, so we'll remove it
2594 // altogether....
2595 //
2596 // Does this screw up legitimate HTML messages?
2597 // If so, the only fix I see is to allow position
2598 // attributes (any values? I think we still have
2599 // to block static and fixed) only if $use_iframe
2600 // is enabled (1.5.0+)
2601 //
2602 // was: "/position\s*:\s*absolute/i",
2603 //
2604 "/position\s*:/i",
2605
2606 "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
2607 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2608 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2609 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
2610 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
2611 ),
2612 Array(
2613 "",
2614 "idiocy",
2615 "idiocy",
2616 "idiocy",
2617 "idiocy",
2618 "idiocy",
2619 "url",
2620 "url(\\1#\\1)",
2621 "url(\\1#\\1)",
2622 "url(\\1#\\1)",
2623 "\\1:url(\\2#\\3)"
2624 )
2625 )
2626 )
2627 );
2628
2629 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
2630 // images off by default.
2631 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
2632
2633 if (!$view_unsafe_images){
2634 /**
2635 * Remove any references to http/https if view_unsafe_images set
2636 * to false.
2637 */
2638 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
2639 '/^([\'\"])\s*https*:.*([\'\"])/si');
2640 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
2641 "\\1$secremoveimg\\1");
2642 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
2643 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
2644 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
2645 "url(\\1$secremoveimg\\1)");
2646 }
2647
2648 $add_attr_to_tag = Array(
2649 "/^a$/i" =>
2650 Array('target'=>'"_blank"',
2651 'title'=>'"'._("This external link will open in a new window").'"'
2652 )
2653 );
2654 $trusted = sq_sanitize($body,
2655 $tag_list,
2656 $rm_tags_with_content,
2657 $self_closing_tags,
2658 $force_tag_closing,
2659 $rm_attnames,
2660 $bad_attvals,
2661 $add_attr_to_tag,
2662 $message,
2663 $id,
2664 $mailbox
2665 );
2666 if (strpos($trusted,$secremoveimg)){
2667 $has_unsafe_images = true;
2668 }
2669
2670 // we want to parse mailto's in HTML output, change to SM compose links
2671 // this is a modified version of code from url_parser.php... but Marc is
2672 // right: we need a better filtering implementation; adding this randomly
2673 // here is not a great solution
2674 //
2675 if ($take_mailto_links) {
2676 // parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
2677 global $MailTo_PReg_Match;
2678 $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
2679 if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2680 foreach ($regs[0] as $i => $mailto_before) {
2681 $mailto_params = $regs[10][$i];
2682 // get rid of any tailing quote since we have to add send_to to the end
2683 //
2684 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
2685 $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
2686 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
2687 $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
2688
2689 if ($regs[1][$i]) { //if there is an email addr before '?', we need to merge it with the params
2690 $to = 'to=' . $regs[1][$i];
2691 if (strpos($mailto_params, 'to=') > -1) //already a 'to='
2692 $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2693 else {
2694 if ($mailto_params) //already some params, append to them
2695 $mailto_params .= '&amp;' . $to;
2696 else
2697 $mailto_params .= '?' . $to;
2698 }
2699 }
2700
2701 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2702
2703 // we'll already have target=_blank, no need to allow comp_in_new
2704 // here (which would be a lot more work anyway)
2705 //
2706 global $compose_new_win;
2707 $temp_comp_in_new = $compose_new_win;
2708 $compose_new_win = 0;
2709 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2710 $compose_new_win = $temp_comp_in_new;
2711
2712 // remove <a href=" and anything after the next quote (we only
2713 // need the uri, not the link HTML) in compose uri
2714 //
2715 $comp_uri = substr($comp_uri, 9);
2716 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2717 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2718 }
2719 }
2720 }
2721
2722 return $trusted;
2723 }
2724
2725 /**
2726 * function SendDownloadHeaders - send file to the browser
2727 *
2728 * Original Source: SM core src/download.php
2729 * moved here to make it available to other code, and separate
2730 * front end from back end functionality.
2731 *
2732 * @param string $type0 first half of mime type
2733 * @param string $type1 second half of mime type
2734 * @param string $filename filename to tell the browser for downloaded file
2735 * @param boolean $force whether to force the download dialog to pop
2736 * @param optional integer $filesize send the Content-Header and length to the browser
2737 * @return void
2738 */
2739 function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2740 global $languages, $squirrelmail_language;
2741 $isIE = $isIE6plus = false;
2742
2743 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2744
2745 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
2746 strstr($HTTP_USER_AGENT, 'Opera') === false) {
2747 $isIE = true;
2748 }
2749
2750 if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2751 ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2752 $isIE6plus = true;
2753 }
2754
2755 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
2756 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
2757 $filename =
2758 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
2759 } else {
2760 $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&nbsp;', ' ', $filename));
2761 }
2762
2763 // A Pox on Microsoft and it's Internet Explorer!
2764 //
2765 // IE has lots of bugs with file downloads.
2766 // It also has problems with SSL. Both of these cause problems
2767 // for us in this function.
2768 //
2769 // See this article on Cache Control headers and SSL
2770 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2771 //
2772 // The best thing you can do for IE is to upgrade to the latest
2773 // version
2774 //set all the Cache Control Headers for IE
2775 if ($isIE) {
2776 $filename=rawurlencode($filename);
2777 header ("Pragma: public");
2778 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
2779 header ("Cache-Control: post-check=0, pre-check=0", false);
2780 header ("Cache-Control: private");
2781
2782 //set the inline header for IE, we'll add the attachment header later if we need it
2783 header ("Content-Disposition: inline; filename=$filename");
2784 }
2785
2786 if (!$force) {
2787 // Try to show in browser window
2788 header ("Content-Disposition: inline; filename=\"$filename\"");
2789 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2790 } else {
2791 // Try to pop up the "save as" box
2792
2793 // IE makes this hard. It pops up 2 save boxes, or none.
2794 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2795 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2796 // But, according to Microsoft, it is "RFC compliant but doesn't
2797 // take into account some deviations that allowed within the
2798 // specification." Doesn't that mean RFC non-compliant?
2799 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2800
2801 // all browsers need the application/octet-stream header for this
2802 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2803
2804 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2805 // Do not have quotes around filename, but that applied to
2806 // "attachment"... does it apply to inline too?
2807 header ("Content-Disposition: attachment; filename=\"$filename\"");
2808
2809 if ($isIE && !$isIE6plus) {
2810 // This combination seems to work mostly. IE 5.5 SP 1 has
2811 // known issues (see the Microsoft Knowledge Base)
2812
2813 // This works for most types, but doesn't work with Word files
2814 header ("Content-Type: application/download; name=\"$filename\"");
2815 header ("Content-Type: application/force-download; name=\"$filename\"");
2816 // These are spares, just in case. :-)
2817 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2818 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2819 //header("Content-Type: application/octet-stream; name=\"$filename\"");
2820 } else if ($isIE) {
2821 // This is to prevent IE for MIME sniffing and auto open a file in IE
2822 header ("Content-Type: application/force-download; name=\"$filename\"");
2823 } else {
2824 // another application/octet-stream forces download for Netscape
2825 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2826 }
2827 }
2828
2829 //send the content-length header if the calling function provides it
2830 if ($filesize > 0) {
2831 header("Content-Length: $filesize");
2832 }
2833
2834 } // end fn SendDownloadHeaders