Show better filesize approximations for base64-encoded attachments
[squirrelmail.git] / functions / mime.php
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59177427 1<?php
2ba13803 2
35586184 3/**
8bd0068d 4 * mime.php
5 *
8bd0068d 6 * This contains the functions necessary to detect and decode MIME
7 * messages.
8 *
c4faef33 9 * @copyright 1999-2020 The SquirrelMail Project Team
4b4abf93 10 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
8bd0068d 11 * @version $Id$
12 * @package squirrelmail
13 */
b74ba498 14
202bcbcc 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
32functions/imap.php
33functions/attachment_common.php
34functions/display_messages.php
35
36magicHtml => url_parser
37translateText => url_parser
38
39*/
40
8beafbbc 41
7c7b74b3 42/* -------------------------------------------------------------------------- */
43/* MIME DECODING */
44/* -------------------------------------------------------------------------- */
b74ba498 45
d6c32258 46/**
8bd0068d 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 */
a4a70693 53function mime_structure ($bodystructure, $flags=array()) {
c9d78ab4 54
3d8371be 55 /* Isolate the body structure and remove beginning and end parenthesis. */
a4a70693 56 $read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') + 13));
451f74a2 57 $read = trim(substr ($read, 0, -1));
22efa9fb 58 $i = 0;
59 $msg = Message::parseStructure($read,$i);
2b665f28 60
9de42168 61 if (!is_object($msg)) {
3d8371be 62 global $color, $mailbox;
a48eba8f 63 displayPageHeader( $color, $mailbox );
5e8de8b6 64 $errormessage = _("SquirrelMail could not decode the bodystructure of the message");
8bd0068d 65 $errormessage .= '<br />'._("The bodystructure provided by your IMAP server:").'<br /><br />';
3047e291 66 $errormessage .= '<pre>' . sm_encode_html_special_chars($read) . '</pre>';
ce8c6f42 67 plain_error_message( $errormessage );
3d8371be 68 echo '</body></html>';
9de42168 69 exit;
70 }
a4a70693 71 if (count($flags)) {
7a9e9c89 72 foreach ($flags as $flag) {
e1115979 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.
7a9e9c89 74 $char = strtoupper($flag{1});
75 switch ($char) {
3d8371be 76 case 'S':
77 if (strtolower($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 $msg->is_flagged = true;
94 }
1a753239 95 else if (strtolower($flag) == '$forwarded') {
96 $msg->is_forwarded = true;
97 }
3d8371be 98 break;
99 case 'M':
100 if (strtolower($flag) == '$mdnsent') {
101 $msg->is_mdnsent = true;
102 }
103 break;
104 default:
105 break;
7a9e9c89 106 }
107 }
451f74a2 108 }
7a9e9c89 109 // listEntities($msg);
3d8371be 110 return $msg;
451f74a2 111}
b74ba498 112
22efa9fb 113
114
3d8371be 115/* This starts the parsing of a particular structure. It is called recursively,
8bd0068d 116 * so it can be passed different structures. It returns an object of type
117 * $message.
118 * First, it checks to see if it is a multipart message. If it is, then it
119 * handles that as it sees is necessary. If it is just a regular entity,
120 * then it parses it and adds the necessary header information (by calling out
121 * to mime_get_elements()
122 */
451f74a2 123
4d592352 124function mime_fetch_body($imap_stream, $id, $ent_id=1, $fetch_size=0) {
3d8371be 125 /* Do a bit of error correction. If we couldn't find the entity id, just guess
8bd0068d 126 * that it is the first one. That is usually the case anyway.
127 */
7c7b74b3 128
09a4bde3 129 if (!$ent_id) {
08b7f7cc 130 $cmd = "FETCH $id BODY[]";
1035e159 131 } else {
08b7f7cc 132 $cmd = "FETCH $id BODY[$ent_id]";
09a4bde3 133 }
3d8371be 134
4d592352 135 if ($fetch_size!=0) $cmd .= "<0.$fetch_size>";
da2415c1 136
6201339c 137 $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, TRUE);
77b88425 138 do {
3d8371be 139 $topline = trim(array_shift($data));
8439f61d 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.
a4a70693 147
451f74a2 148 $wholemessage = implode('', $data);
b7910e12 149 if (preg_match('/\{([^\}]*)\}/', $topline, $regs)) {
3d8371be 150 $ret = substr($wholemessage, 0, $regs[1]);
151 /* There is some information in the content info header that could be important
8bd0068d 152 * in order to parse html messages. Let's get them here.
153 */
0600bdf1 154// if ($ret{0} == '<') {
6201339c 155// $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, TRUE);
0600bdf1 156// }
b7910e12 157 } else if (preg_match('/"([^"]*)"/', $topline, $regs)) {
451f74a2 158 $ret = $regs[1];
06bcb9c3 159 } else if ((stristr($topline, 'nil') !== false) && (empty($wholemessage))) {
160 $ret = $wholemessage;
451f74a2 161 } else {
162 global $where, $what, $mailbox, $passed_id, $startMessage;
3d8371be 163 $par = 'mailbox=' . urlencode($mailbox) . '&amp;passed_id=' . $passed_id;
451f74a2 164 if (isset($where) && isset($what)) {
3d8371be 165 $par .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
a3daaaf3 166 } else {
3d8371be 167 $par .= '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
451f74a2 168 }
e5ea9327 169 $par .= '&amp;response=' . urlencode($response) .
8bd0068d 170 '&amp;message=' . urlencode($message) .
171 '&amp;topline=' . urlencode($topline);
a019eeb8 172
8bd0068d 173 echo '<tt><br />' .
02474e43 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 />";
346817d4 183
6201339c 184 $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, TRUE);
451f74a2 185 array_shift($data);
186 $wholemessage = implode('', $data);
a019eeb8 187
346817d4 188 $ret = $wholemessage;
a3daaaf3 189 }
3d8371be 190 return $ret;
451f74a2 191}
d4467150 192
fa26ab45 193function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding, $rStream='php://stdout', $force_crlf='') {
1035e159 194
3d8371be 195 /* Don't kill the connection if the browser is over a dialup
8bd0068d 196 * and it would take over 30 seconds to download it.
197 * Don't call set_time_limit in safe mode.
198 */
b7206e1d 199
3d8371be 200 if (!ini_get('safe_mode')) {
b7206e1d 201 set_time_limit(0);
202 }
7c7b74b3 203 /* in case of base64 encoded attachments, do not buffer them.
8bd0068d 204 Instead, echo the decoded attachment directly to screen */
7c7b74b3 205 if (strtolower($encoding) == 'base64') {
206 if (!$ent_id) {
7591f143 207 $query = "FETCH $id BODY[]";
7c7b74b3 208 } else {
7591f143 209 $query = "FETCH $id BODY[$ent_id]";
7c7b74b3 210 }
7591f143 211 sqimap_run_command($imap_stream,$query,true,$response,$message,TRUE,'sqimap_base64_decode',$rStream,true);
1d142b8d 212 } else {
7591f143 213 $body = mime_fetch_body ($imap_stream, $id, $ent_id);
214 if (is_resource($rStream)) {
fa26ab45 215 fputs($rStream,decodeBody($body, $encoding, $force_crlf));
7591f143 216 } else {
fa26ab45 217 echo decodeBody($body, $encoding, $force_crlf);
7591f143 218 }
1d142b8d 219 }
346817d4 220
da2415c1 221 /*
8bd0068d 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 */
da2415c1 231 /*
8bd0068d 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 */
7c7b74b3 235
5d9c6f73 236 return;
451f74a2 237}
beb9e459 238
451f74a2 239/* -[ END MIME DECODING ]----------------------------------------------------------- */
d4467150 240
3d8371be 241/* This is here for debugging purposes. It will print out a list
8bd0068d 242 * of all the entity IDs that are in the $message object.
243 */
451f74a2 244function listEntities ($message) {
3d8371be 245 if ($message) {
3c621ba1 246 echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br />';
3d8371be 247 for ($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 $msg;
254 }
255 }
a4a70693 256 }
451f74a2 257}
f0c4dc12 258
f792c641 259function getPriorityStr($priority) {
3d8371be 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;
f792c641 284}
285
451f74a2 286/* returns a $message object for a particular entity id */
287function getEntity ($message, $ent_id) {
a4a70693 288 return $message->getEntity($ent_id);
451f74a2 289}
8beafbbc 290
3d8371be 291/* translateText
8bd0068d 292 * Extracted from strings.php 23/03/2002
293 */
da4c66e8 294
295function translateText(&$body, $wrap_at, $charset) {
3d8371be 296 global $where, $what; /* from searching */
297 global $color; /* color theme */
da4c66e8 298
202bcbcc 299 // require_once(SM_PATH . 'functions/url_parser.php');
da4c66e8 300
301 $body_ary = explode("\n", $body);
da4c66e8 302 for ($i=0; $i < count($body_ary); $i++) {
4c1f4be3 303 $line = rtrim($body_ary[$i],"\r");
304
da4c66e8 305 if (strlen($line) - 2 >= $wrap_at) {
c7aff938 306 sqWordWrap($line, $wrap_at, $charset);
da4c66e8 307 }
308 $line = charset_decode($charset, $line);
309 $line = str_replace("\t", ' ', $line);
310
311 parseUrl ($line);
312
3d8371be 313 $quotes = 0;
da4c66e8 314 $pos = 0;
3d8371be 315 $j = strlen($line);
da4c66e8 316
3d8371be 317 while ($pos < $j) {
da4c66e8 318 if ($line[$pos] == ' ') {
3d8371be 319 $pos++;
da4c66e8 320 } else if (strpos($line, '&gt;', $pos) === $pos) {
321 $pos += 4;
3d8371be 322 $quotes++;
da4c66e8 323 } else {
324 break;
325 }
326 }
3d8371be 327
83c94382 328 if ($quotes % 2) {
d0814c02 329 $line = '<span class="quote1">' . $line . '</span>';
4c25967c 330 } elseif ($quotes) {
d0814c02 331 $line = '<span class="quote2">' . $line . '</span>';
da4c66e8 332 }
3d8371be 333
da4c66e8 334 $body_ary[$i] = $line;
335 }
336 $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
337}
338
a2bfcbce 339/**
da1b55ad 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.
f8a1ed5a 344 *
da1b55ad 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 $mailbox (since 1.3.0) imap folder name
da1b55ad 355 * @return string html formated message text
356 */
a540f994 357function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX') {
3d8371be 358 /* This if statement checks for the entity to show as the
8bd0068d 359 * primary message. To add more of them, just put them in the
360 * order that is their priority.
361 */
ce68b76b 362 global $startMessage, $languages, $squirrelmail_language,
40a34e57 363 $show_html_default, $sort, $has_unsafe_images, $passed_ent_id,
14c85e39 364 $use_iframe, $iframe_height, $download_and_unsafe_link,
955bfc8f 365 $download_href, $unsafe_image_toggle_href, $unsafe_image_toggle_text,
551c7b53 366 $oTemplate, $nbsp;
2c25d36a 367
368 // workaround for not updated config.php
369 if (! isset($use_iframe)) $use_iframe = false;
77bfbd2e 370
d31f73f1 371 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
372 // images off by default.
afbf184c 373 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
d03c24f4 374
cc34b00d 375 $body = '';
23bcec6f 376 $urlmailbox = urlencode($mailbox);
451f74a2 377 $body_message = getEntity($message, $ent_num);
378 if (($body_message->header->type0 == 'text') ||
8bd0068d 379 ($body_message->header->type0 == 'rfc822')) {
3d8371be 380 $body = mime_fetch_body ($imap_stream, $id, $ent_num);
451f74a2 381 $body = decodeBody($body, $body_message->header->encoding);
e842b215 382
383 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 384 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode')) {
e842b215 385 if (mb_detect_encoding($body) != 'ASCII') {
33a55f5a 386 $body = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode',$body);
e842b215 387 }
388 }
d849b570 389
390 /* As of 1.5.2, $body is passed (and modified) by reference */
391 do_hook('message_body', $body);
23bcec6f 392
3d8371be 393 /* If there are other types that shouldn't be formatted, add
8bd0068d 394 * them here.
395 */
3d8371be 396
451f74a2 397 if ($body_message->header->type1 == 'html') {
3d8371be 398 if ($show_html_default <> 1) {
85015544 399 $entity_conv = array('&nbsp;' => ' ',
8bd0068d 400 '<p>' => "\n",
401 '<P>' => "\n",
402 '<br>' => "\n",
403 '<BR>' => "\n",
404 '<br />' => "\n",
405 '<BR />' => "\n",
406 '&gt;' => '>',
407 '&lt;' => '<');
85015544 408 $body = strtr($body, $entity_conv);
3d8371be 409 $body = strip_tags($body);
85015544 410 $body = trim($body);
411 translateText($body, $wrap_at,
8bd0068d 412 $body_message->header->getParameter('charset'));
a540f994 413 } elseif ($use_iframe) {
84410f31 414 /**
415 * If we don't add html message between iframe tags,
416 * we must detect unsafe images and modify $has_unsafe_images.
f8a1ed5a 417 */
758a7889 418 $html_body = magicHTML($body, $id, $message, $mailbox);
b6c52e61 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);
84410f31 421
2c25d36a 422 // creating iframe url
423 $iframeurl=sqm_baseuri().'src/view_html.php?'
f8a1ed5a 424 . 'mailbox=' . $urlmailbox
2c25d36a 425 . '&amp;passed_id=' . $id
426 . '&amp;ent_id=' . $ent_num
427 . '&amp;view_unsafe_images=' . (int) $view_unsafe_images;
428
79d58d4c 429 global $oTemplate;
430 $oTemplate->assign('iframe_url', $iframeurl);
51554708 431 $oTemplate->assign('iframe_height', $iframe_height);
79d58d4c 432 $oTemplate->assign('html_body', $html_body);
2b665f28 433
79d58d4c 434 $body = $oTemplate->fetch('read_html_iframe.tpl');
a3daaaf3 435 } else {
2c25d36a 436 // old way of html rendering
b6c52e61 437 /**
758a7889 438 * convert character set. charset_decode does not remove html special chars
b6c52e61 439 * applied by magicHTML functions and does not sanitize them second time if
758a7889 440 * fourth argument is true.
441 */
567dc524 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, $mailbox);
a3daaaf3 447 }
451f74a2 448 } else {
3d8371be 449 translateText($body, $wrap_at,
8bd0068d 450 $body_message->header->getParameter('charset'));
451f74a2 451 }
a2bfcbce 452
9ebace19 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.
40a34e57 464 $download_and_unsafe_link = '';
465
9ebace19 466 // Prepare and build a link for downloading the mail.
83cf04bd 467 $link = 'passed_id=' . $id . '&amp;ent_id='.$ent_num.
8bd0068d 468 '&amp;mailbox=' . $urlmailbox .'&amp;sort=' . $sort .
469 '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
08b7f7cc 470 if (isset($passed_ent_id)) {
471 $link .= '&amp;passed_ent_id='.$passed_ent_id;
472 }
14c85e39 473 $download_href = SM_PATH . 'src/download.php?absolute_dl=true&amp;' . $link;
9ebace19 474
475 // Always add the link for downloading the mail as a file to the global
476 // variable.
955bfc8f 477 $download_and_unsafe_link .= "$nbsp|$nbsp"
478 . create_hyperlink($download_href, _("Download this as a file"));
9ebace19 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.
7aad7b77 484 if ($view_unsafe_images) {
23f617b8 485 $text = _("Hide Unsafe Images");
7aad7b77 486 } else {
08b7f7cc 487 if (isset($has_unsafe_images) && $has_unsafe_images) {
488 $link .= '&amp;view_unsafe_images=1';
489 $text = _("View Unsafe Images");
490 } else {
491 $text = '';
492 }
3d8371be 493 }
9ebace19 494
495 // Only create a link for unsafe images if there's need for one. If so:
496 // add it to the global variable.
83cf04bd 497 if($text != '') {
14c85e39 498 $unsafe_image_toggle_href = SM_PATH . 'src/read_body.php?'.$link;
499 $unsafe_image_toggle_text = $text;
955bfc8f 500 $download_and_unsafe_link .= "$nbsp|$nbsp"
501 . create_hyperlink($unsafe_image_toggle_href, $text);
83cf04bd 502 }
3d8371be 503 }
504 return $body;
451f74a2 505}
b74ba498 506
da1b55ad 507/**
a540f994 508 * Generate attachments array for passing to templates.
2b665f28 509 *
d67f519a 510 * @since 1.5.2
da1b55ad 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 $id message id
da1b55ad 515 */
d67f519a 516function buildAttachmentArray($message, $exclude_id, $mailbox, $id) {
caf0ab1d 517 global $where, $what, $startMessage, $color, $passed_ent_id,
518 $base_uri, $block_svg_download;
451f74a2 519
23bcec6f 520 $att_ar = $message->getAttachments($exclude_id);
23bcec6f 521 $urlMailbox = urlencode($mailbox);
522
d67f519a 523 $attachments = array();
23bcec6f 524 foreach ($att_ar as $att) {
fdc9d9b5 525 $ent = $att->entity_id;
2e25760a 526 $header = $att->header;
f0c4dc12 527 $type0 = strtolower($header->type0);
528 $type1 = strtolower($header->type1);
caf0ab1d 529 if ($block_svg_download && strpos($type1, 'svg') === 0)
530 continue;
531
2e25760a 532 $name = '';
d0187bd6 533 $links = array();
21dab2dc 534 $links['download link']['text'] = _("Download");
202bcbcc 535 $links['download link']['href'] = $base_uri .
8bd0068d 536 "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
2b665f28 537
2e25760a 538 if ($type0 =='message' && $type1 == 'rfc822') {
202bcbcc 539 $default_page = $base_uri . 'src/read_body.php';
2e25760a 540 $rfc822_header = $att->rfc822_header;
098ea084 541 $filename = $rfc822_header->subject;
6cc08d8b 542 if (trim( $filename ) == '') {
543 $filename = 'untitled-[' . $ent . ']' ;
08b7f7cc 544 }
2e25760a 545 $from_o = $rfc822_header->from;
546 if (is_object($from_o)) {
04ea844e 547 $from_name = decodeHeader($from_o->getAddress(false));
7e697748 548 } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
549 // something weird happens when a digest message is opened and you return to the digest
550 // now the from object is part of an array. Probably the parseHeader call overwrites the info
551 // retrieved from the bodystructure in a different way. We need to fix this later.
552 // possible starting point, do not fetch header we already have and inspect how
553 // the rfc822_header object behaves.
554 $from_name = decodeHeader($from_o[0]->getAddress(false));
2e25760a 555 } else {
556 $from_name = _("Unknown sender");
f0c4dc12 557 }
d0187bd6 558 $description = _("From").': '.$from_name;
23bcec6f 559 } else {
202bcbcc 560 $default_page = $base_uri . 'src/download.php';
02474e43 561 $filename = $att->getFilename();
f810c0b2 562 if ($header->description) {
098ea084 563 $description = decodeHeader($header->description);
f810c0b2 564 } else {
3d8371be 565 $description = '';
566 }
2e25760a 567 }
568
569 $display_filename = $filename;
3d8371be 570 if (isset($passed_ent_id)) {
571 $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
572 } else {
573 $passed_ent_id_link = '';
574 }
575 $defaultlink = $default_page . "?startMessage=$startMessage"
8bd0068d 576 . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
577 . '&amp;ent_id='.$ent.$passed_ent_id_link;
2e25760a 578 if ($where && $what) {
8bd0068d 579 $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
2e25760a 580 }
7e2ff844 581 // IE does make use of mime content sniffing. Forcing a download
582 // prohibit execution of XSS inside an application/octet-stream attachment
583 if ($type0 == 'application' && $type1 == 'octet-stream') {
584 $defaultlink .= '&amp;absolute_dl=true';
585 }
2b665f28 586
3d8371be 587 /* This executes the attachment hook with a specific MIME-type.
53901c7b 588 * It also allows plugins to run if there's a rule for a more
589 * generic type. Finally, a hook for ALL attachment types is
590 * run as well.
8bd0068d 591 */
8dca4d22 592 // First remember the default link.
593 $defaultlink_orig = $defaultlink;
594
d849b570 595 /* The API for this hook has changed as of 1.5.2 so that all plugin
596 arguments are passed in an array instead of each their own plugin
597 argument, and arguments are passed by reference, so instead of
598 returning any changes, changes should simply be made to the original
599 arguments themselves. */
53901c7b 600 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
9c3b2d22 601 &$defaultlink, &$display_filename, &$where, &$what);
602 do_hook("attachment $type0/$type1", $temp);
53901c7b 603 /* The API for this hook has changed as of 1.5.2 so that all plugin
604 arguments are passed in an array instead of each their own plugin
605 argument, and arguments are passed by reference, so instead of
606 returning any changes, changes should simply be made to the original
607 arguments themselves. */
608 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
609 &$defaultlink, &$display_filename, &$where, &$what);
610 // Do not let a generic plugin change the default link if a more
611 // specialized one already did it...
612 if ($defaultlink != $defaultlink_orig) {
613 $dummy = '';
614 $temp[5] = &$dummy;
2e25760a 615 }
53901c7b 616 do_hook("attachment $type0/*", $temp);
d849b570 617 /* The API for this hook has changed as of 1.5.2 so that all plugin
618 arguments are passed in an array instead of each their own plugin
619 argument, and arguments are passed by reference, so instead of
620 returning any changes, changes should simply be made to the original
621 arguments themselves. */
9c3b2d22 622 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
623 &$defaultlink, &$display_filename, &$where, &$what);
8dca4d22 624 // Do not let a generic plugin change the default link if a more
625 // specialized one already did it...
626 if ($defaultlink != $defaultlink_orig) {
627 $dummy = '';
628 $temp[5] = &$dummy;
629 }
9c3b2d22 630 do_hook("attachment */*", $temp);
77b88425 631
d67f519a 632 $this_attachment = array();
633 $this_attachment['Name'] = decodeHeader($display_filename);
634 $this_attachment['Description'] = $description;
635 $this_attachment['DefaultHREF'] = $defaultlink;
636 $this_attachment['DownloadHREF'] = $links['download link']['href'];
637 $this_attachment['ViewHREF'] = isset($links['attachment_common']) ? $links['attachment_common']['href'] : '';
24e8917e 638
639 // base64 encoded file sizes are misleading, so approximate real size
640 if (!empty($header->encoding) && strtolower($header->encoding) == 'base64')
641 $this_attachment['Size'] = $header->size / 4 * 3;
642 else
643 $this_attachment['Size'] = $header->size;
644
3047e291 645 $this_attachment['ContentType'] = sm_encode_html_special_chars($type0 .'/'. $type1);
d67f519a 646 $this_attachment['OtherLinks'] = array();
3d8371be 647 foreach ($links as $val) {
d0187bd6 648 if ($val['text']==_("Download") || $val['text'] == _("View"))
649 continue;
650 if (empty($val['text']) && empty($val['extra']))
651 continue;
2b665f28 652
d67f519a 653 $temp = array();
654 $temp['HREF'] = $val['href'];
655 $temp['Text'] = (empty($val['text']) ? '' : $val['text']) . (empty($val['extra']) ? '' : $val['extra']);
656 $this_attachment['OtherLinks'][] = $temp;
2e25760a 657 }
d67f519a 658 $attachments[] = $this_attachment;
2b665f28 659
3d8371be 660 unset($links);
2e25760a 661 }
2b665f28 662
d67f519a 663 return $attachments;
664}
665
666/**
667 * Displays attachment links and information
668 *
669 * Since 1.3.0 function is not included in formatBody() call.
670 *
671 * Since 1.0.2 uses attachment $type0/$type1 hook.
672 * Since 1.2.5 uses attachment $type0/* hook.
673 * Since 1.5.0 uses attachments_bottom hook.
674 * Since 1.5.2 uses templates and does *not* return a value.
675 *
676 * @param object $message SquirrelMail message object
677 * @param array $exclude_id message parts that are not attachments.
678 * @param string $mailbox mailbox name
679 * @param integer $id message id
680 */
681function formatAttachments($message, $exclude_id, $mailbox, $id) {
682 global $oTemplate;
2b665f28 683
d67f519a 684 $attach = buildAttachmentArray($message, $exclude_id, $mailbox, $id);
d0187bd6 685
686 $oTemplate->assign('attachments', $attach);
687 $oTemplate->display('read_attachments.tpl');
451f74a2 688}
b74ba498 689
7c7b74b3 690function sqimap_base64_decode(&$string) {
7c0ec1d8 691
b17a8968 692 // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
7c0ec1d8 693 // fly decoding (to reduce memory usage) you have to check if the
694 // data has incomplete pairs
695
b17a8968 696 // Remove the noise in order to check if the 4 bytes pairs are complete
7c0ec1d8 697 $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
698
42ce44f8 699 $sStringRem = '';
7c0ec1d8 700 $iMod = strlen($string) % 4;
701 if ($iMod) {
702 $sStringRem = substr($string,-$iMod);
b17a8968 703 // Check if $sStringRem contains padding characters
7c0ec1d8 704 if (substr($sStringRem,-1) != '=') {
705 $string = substr($string,0,-$iMod);
706 } else {
707 $sStringRem = '';
708 }
709 }
7c7b74b3 710 $string = base64_decode($string);
7c0ec1d8 711 return $sStringRem;
7c7b74b3 712}
713
fdf7cef1 714/**
fa26ab45 715 * Decodes encoded string (usually message body)
716 *
717 * This function decodes a string (usually the message body)
718 * depending on the encoding type. Currently quoted-printable
719 * and base64 encodings are supported.
720 *
721 * The decode_body hook was added to this function in 1.4.2/1.5.0.
722 * The $force_crlf parameter was added in 1.5.2.
723 *
724 * @param string $string The encoded string
725 * @param string $encoding used encoding
726 * @param string $force_crlf Whether or not to force CRLF or LF
727 * line endings (or to leave as is).
728 * If given as "LF", line endings will
729 * all be converted to LF; if "CRLF",
730 * line endings will all be converted
731 * to CRLF. If given as an empty value,
9785376e 732 * the global $force_crlf_default will
fa26ab45 733 * be consulted (it can be specified in
734 * config/config_local.php). Otherwise,
735 * any other value will cause the string
736 * to be left alone. Note that this will
737 * be overridden to "LF" if not using at
738 * least PHP version 4.3.0. (OPTIONAL;
739 * default is empty - consult global
740 * default value)
741 *
742 * @return string The decoded string
fdf7cef1 743 *
fdf7cef1 744 * @since 1.0
fa26ab45 745 *
fdf7cef1 746 */
fa26ab45 747function decodeBody($string, $encoding, $force_crlf='') {
748
749 global $force_crlf_default;
750 if (empty($force_crlf)) $force_crlf = $force_crlf_default;
751 $force_crlf = strtoupper($force_crlf);
752
753 // must force line endings to LF due to broken
754 // quoted_printable_decode() in PHP versions
755 // before 4.3.0 (see below)
756 //
757 if (!check_php_version(4, 3, 0) || $force_crlf == 'LF')
758 $string = str_replace("\r\n", "\n", $string);
759 else if ($force_crlf == 'CRLF')
760 $string = str_replace("\n", "\r\n", $string);
83be314a 761
b583c3e8 762 $encoding = strtolower($encoding);
3d8371be 763
d849b570 764 $encoding_handler = do_hook('decode_body', $encoding);
5166f86a 765
766
fa26ab45 767 // plugins get first shot at decoding the string
5166f86a 768 //
769 if (!empty($encoding_handler) && function_exists($encoding_handler)) {
fa26ab45 770 $string = $encoding_handler('decode', $string);
5166f86a 771
fdf7cef1 772 } elseif ($encoding == 'quoted-printable' ||
8bd0068d 773 $encoding == 'quoted_printable') {
fa26ab45 774
775 // quoted_printable_decode() function is broken in older
776 // php versions. Text with \r\n decoding was fixed only
777 // in php 4.3.0. Minimal code requirement is PHP 4.0.4+
778 // and the above call to: str_replace("\r\n", "\n", $string);
779 //
780 $string = quoted_printable_decode($string);
781
fdf7cef1 782 } elseif ($encoding == 'base64') {
fa26ab45 783 $string = base64_decode($string);
b583c3e8 784 }
3d8371be 785
b583c3e8 786 // All other encodings are returned raw.
fa26ab45 787 return $string;
451f74a2 788}
789
9f7f68c3 790/**
8bd0068d 791 * Decodes headers
792 *
e1115979 793 * This function decodes strings that are encoded according to
8bd0068d 794 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
795 * Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
796 *
797 * @param string $string header string that has to be made readable
798 * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
bcae324b 799 * @param boolean $htmlsafe preserve spaces and sanitize html special characters. defaults to true
8bd0068d 800 * @param boolean $decide decide if string can be utfencoded. defaults to false
801 * @return string decoded header string
802 */
bcae324b 803function decodeHeader ($string, $utfencode=true,$htmlsafe=true,$decide=false) {
caf0ab1d 804 global $languages, $squirrelmail_language,$default_charset, $fix_broken_base64_encoded_messages;
79e07c7e 805 if (is_array($string)) {
806 $string = implode("\n", $string);
807 }
da2415c1 808
10dec454 809 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 810 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
33a55f5a 811 $string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
08b7f7cc 812 // Do we need to return at this point?
813 // return $string;
83be314a 814 }
79e07c7e 815 $i = 0;
08b7f7cc 816 $iLastMatch = -2;
db65b6b0 817 $encoded = true;
0a06275a 818
821d1f14 819// FIXME: spaces are allowed inside quoted-printable encoding, but the following line will bust up any such encoded strings
098ea084 820 $aString = explode(' ',$string);
08b7f7cc 821 $ret = '';
098ea084 822 foreach ($aString as $chunk) {
358a78a1 823 if ($encoded && $chunk === '') {
08b7f7cc 824 continue;
358a78a1 825 } elseif ($chunk === '') {
08b7f7cc 826 $ret .= ' ';
827 continue;
828 }
098ea084 829 $encoded = false;
08b7f7cc 830 /* if encoded words are not separated by a linear-space-white we still catch them */
831 $j = $i-1;
7e6ca3e8 832
08b7f7cc 833 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
834 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
835 if ($iLastMatch !== $j) {
bcae324b 836 if ($htmlsafe) {
9f7f68c3 837 $ret .= '&#32;';
08b7f7cc 838 } else {
839 $ret .= ' ';
840 }
841 }
842 $iLastMatch = $i;
843 $j = $i;
bcae324b 844 if ($htmlsafe) {
3047e291 845 $ret .= sm_encode_html_special_chars($res[1]);
cb718de0 846 } else {
847 $ret .= $res[1];
848 }
098ea084 849 $encoding = ucfirst($res[3]);
d6f584fc 850
851 /* decide about valid decoding */
852 if ($decide && is_conversion_safe($res[2])) {
8bd0068d 853 $utfencode=true;
854 $can_be_encoded=true;
d6f584fc 855 } else {
8bd0068d 856 $can_be_encoded=false;
d6f584fc 857 }
098ea084 858 switch ($encoding)
859 {
8bd0068d 860 case 'B':
caf0ab1d 861 // fix broken base64-encoded strings (remove end = padding,
862 // change any = to + in middle of string, add padding back
863 // to the end)
864 if ($fix_broken_base64_encoded_messages) {
865 $encoded_string_minus_padding = strtr(rtrim($res[4], '='), '=', '+');
866 $res[4] = str_pad($encoded_string_minus_padding, strlen($res[4]), '=');
867 }
8bd0068d 868 $replace = base64_decode($res[4]);
869 if ($utfencode) {
870 if ($can_be_encoded) {
871 /* convert string to different charset,
872 * if functions asks for it (usually in compose)
873 */
bcae324b 874 $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
8bd0068d 875 } else {
876 // convert string to html codes in order to display it
877 $ret .= charset_decode($res[2],$replace);
878 }
fab65ca9 879 } else {
bcae324b 880 if ($htmlsafe) {
3047e291 881 $replace = sm_encode_html_special_chars($replace);
8bd0068d 882 }
883 $ret.= $replace;
fab65ca9 884 }
8bd0068d 885 break;
886 case 'Q':
887 $replace = str_replace('_', ' ', $res[4]);
6c4e2e9b 888 $replace = preg_replace_callback('/=([0-9a-f]{2})/i',
889 create_function ('$matches', 'return chr(hexdec($matches[1]));'),
8bd0068d 890 $replace);
891 if ($utfencode) {
892 if ($can_be_encoded) {
893 /* convert string to different charset,
894 * if functions asks for it (usually in compose)
895 */
bcae324b 896 $replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
8bd0068d 897 } else {
898 // convert string to html codes in order to display it
899 $replace = charset_decode($res[2], $replace);
900 }
901 } else {
bcae324b 902 if ($htmlsafe) {
3047e291 903 $replace = sm_encode_html_special_chars($replace);
8bd0068d 904 }
098ea084 905 }
8bd0068d 906 $ret .= $replace;
907 break;
908 default:
909 break;
79e07c7e 910 }
098ea084 911 $chunk = $res[5];
912 $encoded = true;
08b7f7cc 913 }
914 if (!$encoded) {
bcae324b 915 if ($htmlsafe) {
9f7f68c3 916 $ret .= '&#32;';
08b7f7cc 917 } else {
918 $ret .= ' ';
da2415c1 919 }
08b7f7cc 920 }
dc3d13a7 921
bcae324b 922 if (!$encoded && $htmlsafe) {
3047e291 923 $ret .= sm_encode_html_special_chars($chunk);
dc3d13a7 924 } else {
925 $ret .= $chunk;
926 }
098ea084 927 ++$i;
928 }
fd81e884 929 /* remove the first added space */
930 if ($ret) {
bcae324b 931 if ($htmlsafe) {
9f7f68c3 932 $ret = substr($ret,5);
fd81e884 933 } else {
934 $ret = substr($ret,1);
935 }
936 }
da2415c1 937
08b7f7cc 938 return $ret;
451f74a2 939}
940
9f7f68c3 941/**
a24cf710 942 * Encodes header
8bd0068d 943 *
a24cf710 944 * Function uses XTRA_CODE _encodeheader function, if such function exists.
a24cf710 945 *
758a7889 946 * Function uses Q encoding by default and encodes a string according to RFC
947 * 1522 for use in headers if it contains 8-bit characters or anything that
a24cf710 948 * looks like it should be encoded.
8bd0068d 949 *
758a7889 950 * Function switches to B encoding and encodeHeaderBase64() function, if
951 * string is 8bit and multibyte character set supported by mbstring extension
952 * is used. It can cause E_USER_NOTICE errors, if interface is used with
f270a6eb 953 * multibyte character set unsupported by mbstring extension.
954 *
8bd0068d 955 * @param string $string header string, that has to be encoded
956 * @return string quoted-printable encoded string
f270a6eb 957 * @todo make $mb_charsets system wide constant
8bd0068d 958 */
451f74a2 959function encodeHeader ($string) {
6fbd125b 960 global $default_charset, $languages, $squirrelmail_language;
83be314a 961
10dec454 962 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 963 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
33a55f5a 964 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
83be314a 965 }
793cc001 966
a24cf710 967 // Use B encoding for multibyte charsets
f270a6eb 968 $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
969 if (in_array($default_charset,$mb_charsets) &&
970 in_array($default_charset,sq_mb_list_encodings()) &&
971 sq_is8bit($string)) {
972 return encodeHeaderBase64($string,$default_charset);
973 } elseif (in_array($default_charset,$mb_charsets) &&
974 sq_is8bit($string) &&
975 ! in_array($default_charset,sq_mb_list_encodings())) {
976 // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
977 // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
978 }
a24cf710 979
451f74a2 980 // Encode only if the string contains 8-bit characters or =?
3d8371be 981 $j = strlen($string);
098ea084 982 $max_l = 75 - strlen($default_charset) - 7;
983 $aRet = array();
451f74a2 984 $ret = '';
c96c32f4 985 $iEncStart = $enc_init = false;
0d53f0f9 986 $cur_l = $iOffset = 0;
3d8371be 987 for($i = 0; $i < $j; ++$i) {
c96c32f4 988 switch($string{$i})
989 {
6b76cffa 990 case '"':
8bd0068d 991 case '=':
992 case '<':
993 case '>':
994 case ',':
995 case '?':
996 case '_':
997 if ($iEncStart === false) {
998 $iEncStart = $i;
999 }
1000 $cur_l+=3;
1001 if ($cur_l > ($max_l-2)) {
1002 /* if there is an stringpart that doesn't need encoding, add it */
08b7f7cc 1003 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 1004 $aRet[] = "=?$default_charset?Q?$ret?=";
1005 $iOffset = $i;
1006 $cur_l = 0;
1007 $ret = '';
1008 $iEncStart = false;
08b7f7cc 1009 } else {
8bd0068d 1010 $ret .= sprintf("=%02X",ord($string{$i}));
c96c32f4 1011 }
8bd0068d 1012 break;
1013 case '(':
1014 case ')':
1015 if ($iEncStart !== false) {
08b7f7cc 1016 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
8bd0068d 1017 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 1018 $iOffset = $i;
8bd0068d 1019 $cur_l = 0;
1020 $ret = '';
1021 $iEncStart = false;
c96c32f4 1022 }
8bd0068d 1023 break;
1024 case ' ':
c96c32f4 1025 if ($iEncStart !== false) {
098ea084 1026 $cur_l++;
1027 if ($cur_l > $max_l) {
08b7f7cc 1028 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 1029 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 1030 $iOffset = $i;
1031 $cur_l = 0;
098ea084 1032 $ret = '';
8bd0068d 1033 $iEncStart = false;
08b7f7cc 1034 } else {
8bd0068d 1035 $ret .= '_';
c96c32f4 1036 }
3d8371be 1037 }
8bd0068d 1038 break;
1039 default:
1040 $k = ord($string{$i});
1041 if ($k > 126) {
1042 if ($iEncStart === false) {
1043 // do not start encoding in the middle of a string, also take the rest of the word.
1044 $sLeadString = substr($string,0,$i);
1045 $aLeadString = explode(' ',$sLeadString);
1046 $sToBeEncoded = array_pop($aLeadString);
1047 $iEncStart = $i - strlen($sToBeEncoded);
1048 $ret .= $sToBeEncoded;
1049 $cur_l += strlen($sToBeEncoded);
1050 }
1051 $cur_l += 3;
1052 /* first we add the encoded string that reached it's max size */
1053 if ($cur_l > ($max_l-2)) {
1054 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1055 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
1056 $cur_l = 3;
1057 $ret = '';
1058 $iOffset = $i;
1059 $iEncStart = $i;
1060 }
1061 $enc_init = true;
1062 $ret .= sprintf("=%02X", $k);
1063 } else {
1064 if ($iEncStart !== false) {
1065 $cur_l++;
1066 if ($cur_l > $max_l) {
1067 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1068 $aRet[] = "=?$default_charset?Q?$ret?=";
1069 $iEncStart = false;
1070 $iOffset = $i;
1071 $cur_l = 0;
1072 $ret = '';
1073 } else {
1074 $ret .= $string{$i};
1075 }
1076 }
1077 }
1078 break;
f7b3ba37 1079 }
451f74a2 1080 }
793cc001 1081
c96c32f4 1082 if ($enc_init) {
1083 if ($iEncStart !== false) {
1084 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1085 $aRet[] = "=?$default_charset?Q?$ret?=";
1086 } else {
1087 $aRet[] = substr($string,$iOffset);
1088 }
1089 $string = implode('',$aRet);
451f74a2 1090 }
3d8371be 1091 return $string;
451f74a2 1092}
b74ba498 1093
f270a6eb 1094/**
1095 * Encodes string according to rfc2047 B encoding header formating rules
1096 *
758a7889 1097 * It is recommended way to encode headers with character sets that store
f270a6eb 1098 * symbols in more than one byte.
1099 *
1100 * Function requires mbstring support. If required mbstring functions are missing,
1101 * function returns false and sets E_USER_WARNING level error message.
1102 *
758a7889 1103 * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1104 * that mbstring functions will generate E_WARNING errors, if unsupported
f270a6eb 1105 * character set is used. mb_encode_mimeheader function provided by php
1106 * mbstring extension is not used in order to get better control of header
1107 * encoding.
1108 *
758a7889 1109 * Used php code functions - function_exists(), trigger_error(), strlen()
1110 * (is used with charset names and base64 strings). Used php mbstring
f270a6eb 1111 * functions - mb_strlen and mb_substr.
1112 *
758a7889 1113 * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
f270a6eb 1114 * encoding), rfc 2822 (header folding)
1115 *
1116 * @param string $string header string that must be encoded
758a7889 1117 * @param string $charset character set. Must be supported by mbstring extension.
f270a6eb 1118 * Use sq_mb_list_encodings() to detect supported charsets.
1119 * @return string string encoded according to rfc2047 B encoding formating rules
1120 * @since 1.5.1
1121 * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1122 * @todo Do we want to control max length of header?
1123 * @todo Do we want to control EOL (end-of-line) marker?
1124 * @todo Do we want to translate error message?
1125 */
1126function encodeHeaderBase64($string,$charset) {
1127 /**
1128 * Check mbstring function requirements.
1129 */
1130 if (! function_exists('mb_strlen') ||
1131 ! function_exists('mb_substr')) {
1132 // set E_USER_WARNING
1133 trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1134 // return false
1135 return false;
1136 }
1137
1138 // initial return array
1139 $aRet = array();
1140
1141 /**
1142 * header length = 75 symbols max (same as in encodeHeader)
1143 * remove $charset length
1144 * remove =? ? ?= (5 chars)
1145 * remove 2 more chars (\r\n ?)
1146 */
1147 $iMaxLength = 75 - strlen($charset) - 7;
1148
1149 // set first character position
1150 $iStartCharNum = 0;
1151
1152 // loop through all characters. count characters and not bytes.
1153 for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1154 // encode string from starting character to current character.
1155 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1156
1157 // Check encoded string length
1158 if(strlen($encoded_string)>$iMaxLength) {
1159 // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1160 $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1161
1162 // set new starting character
1163 $iStartCharNum = $iCharNum-1;
1164
1165 // encode last char (in case it is last character in string)
1166 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1167 } // if string is shorter than max length - add next character
1168 }
1169
1170 // add last encoded string to array
1171 $aRet[] = $encoded_string;
1172
1173 // set initial return string
1174 $sRet = '';
1175
1176 // loop through encoded strings
1177 foreach($aRet as $string) {
1178 // TODO: Do we want to control EOL (end-of-line) marker
1179 if ($sRet!='') $sRet.= " ";
1180
1181 // add header tags and encoded string to return string
1182 $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1183 }
1184
1185 return $sRet;
1186}
1187
691a2d25 1188/* This function trys to locate the entity_id of a specific mime element */
3d8371be 1189function find_ent_id($id, $message) {
a171b359 1190 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1191 if ($message->entities[$i]->header->type0 == 'multipart') {
3d8371be 1192 $ret = find_ent_id($id, $message->entities[$i]);
451f74a2 1193 } else {
3d8371be 1194 if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
d8cffbab 1195// if (sq_check_save_extension($message->entities[$i])) {
8bd0068d 1196 return $message->entities[$i]->entity_id;
da2415c1 1197// }
c8f5f606 1198 } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1199 /**
1200 * This is part of a fix for Outlook Express 6.x generating
1201 * cid URLs without creating content-id headers
1202 * @@JA - 20050207
1203 */
1204 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1205 return $message->entities[$i]->entity_id;
1206 }
3d8371be 1207 }
a3daaaf3 1208 }
451f74a2 1209 }
3d8371be 1210 return $ret;
451f74a2 1211}
a3daaaf3 1212
e5e9381a 1213function sq_check_save_extension($message) {
1214 $filename = $message->getFilename();
1215 $ext = substr($filename, strrpos($filename,'.')+1);
1216 $save_extensions = array('jpg','jpeg','gif','png','bmp');
3d8371be 1217 return in_array($ext, $save_extensions);
e5e9381a 1218}
1219
1220
691a2d25 1221/**
8bd0068d 1222 ** HTMLFILTER ROUTINES
1223 */
451f74a2 1224
691a2d25 1225/**
0493ed11 1226 * This function checks attribute values for entity-encoded values
1227 * and returns them translated into 8-bit strings so we can run
1228 * checks on them.
8bd0068d 1229 *
0493ed11 1230 * @param $attvalue A string to run entity check against.
1231 * @return Nothing, modifies a reference value.
8bd0068d 1232 */
0493ed11 1233function sq_defang(&$attvalue){
1234 $me = 'sq_defang';
2dd879b8 1235 /**
0493ed11 1236 * Skip this if there aren't ampersands or backslashes.
8bd0068d 1237 */
0493ed11 1238 if (strpos($attvalue, '&') === false
1239 && strpos($attvalue, '\\') === false){
1240 return;
2dd879b8 1241 }
0493ed11 1242 $m = false;
2b665f28 1243 // before deent, translate the dangerous unicode characters and ... to safe values
1244 // otherwise the regular expressions do not match.
1245
1246
1247
0493ed11 1248 do {
1249 $m = false;
1250 $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1251 $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1252 $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1253 } while ($m == true);
1254 $attvalue = stripslashes($attvalue);
2dd879b8 1255}
1256
1257/**
8bd0068d 1258 * Kill any tabs, newlines, or carriage returns. Our friends the
1259 * makers of the browser with 95% market value decided that it'd
1260 * be funny to make "java[tab]script" be just as good as "javascript".
1261 *
1262 * @param attvalue The attribute value before extraneous spaces removed.
0493ed11 1263 * @return attvalue Nothing, modifies a reference value.
8bd0068d 1264 */
0493ed11 1265function sq_unspace(&$attvalue){
1266 $me = 'sq_unspace';
1267 if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1268 $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1269 Array('', '', '', '', ''), $attvalue);
2dd879b8 1270 }
2dd879b8 1271}
1272
1273/**
88de4926 1274 * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
2b665f28 1275 * IE as regular characters.
1276 *
1277 * @param attvalue The attribute value before dangerous characters are translated.
1278 * @return attvalue Nothing, modifies a reference value.
1279 * @author Marc Groot Koerkamp.
1280 */
1281function sq_fixIE_idiocy(&$attvalue) {
1282 // remove NUL
1283 $attvalue = str_replace("\0", "", $attvalue);
1284 // remove comments
1285 $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1286
88de4926 1287 // IE has the evil habit of accepting every possible value for the attribute expression.
1288 // The table below contains characters which are parsed by IE if they are used in the "expression"
2b665f28 1289 // attribute value.
1290 $aDangerousCharsReplacementTable = array(
1291 array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1292 '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1293 '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
567dc524 1294 '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1295 '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
2b665f28 1296 '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1297 '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1298 '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1299 '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1300 '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1301 '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1302 '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1303 '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1304 '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1305 '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1306 '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1307 '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1308 '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1309 '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1310 '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1311 '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1312 '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1313 '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1314 '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
567dc524 1315 "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range
1316 "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1317 "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1318 "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1319 "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1320 "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1321 "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1322 "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1323 "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1324 "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1325 "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1326 "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1327 "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1328 "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1329 "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1330 "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1331 "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1332 "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1333 "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1334 "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1335 "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1336 "\xCA\x9F", /* L UNICODE IPA Extension */
1337 "\xCA\x80", /* R UNICODE IPA Extension */
1338 "\xC9\xB4"), /* N UNICODE IPA Extension */
2b665f28 1339 array('l', 'l', 'r','r','n','n',
567dc524 1340 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1341 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1342 'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
2b665f28 1343 $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1344
88de4926 1345 // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1346 // used for XSS.
2b665f28 1347 $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1348}
1349
1350/**
8bd0068d 1351 * This function returns the final tag out of the tag name, an array
1352 * of attributes, and the type of the tag. This function is called by
1353 * sq_sanitize internally.
1354 *
1355 * @param $tagname the name of the tag.
1356 * @param $attary the array of attributes and their values
1357 * @param $tagtype The type of the tag (see in comments).
1358 * @return a string with the final tag representation.
1359 */
691a2d25 1360function sq_tagprint($tagname, $attary, $tagtype){
b583c3e8 1361 $me = 'sq_tagprint';
3d8371be 1362
691a2d25 1363 if ($tagtype == 2){
1364 $fulltag = '</' . $tagname . '>';
1365 } else {
1366 $fulltag = '<' . $tagname;
1367 if (is_array($attary) && sizeof($attary)){
1368 $atts = Array();
1369 while (list($attname, $attvalue) = each($attary)){
1370 array_push($atts, "$attname=$attvalue");
1371 }
1372 $fulltag .= ' ' . join(" ", $atts);
1373 }
1374 if ($tagtype == 3){
b583c3e8 1375 $fulltag .= ' /';
691a2d25 1376 }
b583c3e8 1377 $fulltag .= '>';
451f74a2 1378 }
691a2d25 1379 return $fulltag;
451f74a2 1380}
a3daaaf3 1381
691a2d25 1382/**
8bd0068d 1383 * A small helper function to use with array_walk. Modifies a by-ref
1384 * value and makes it lowercase.
1385 *
1386 * @param $val a value passed by-ref.
1387 * @return void since it modifies a by-ref value.
1388 */
691a2d25 1389function sq_casenormalize(&$val){
1390 $val = strtolower($val);
1391}
451f74a2 1392
691a2d25 1393/**
8bd0068d 1394 * This function skips any whitespace from the current position within
1395 * a string and to the next non-whitespace value.
1396 *
1397 * @param $body the string
1398 * @param $offset the offset within the string where we should start
1399 * looking for the next non-whitespace character.
1400 * @return the location within the $body where the next
1401 * non-whitespace char is located.
1402 */
691a2d25 1403function sq_skipspace($body, $offset){
b583c3e8 1404 $me = 'sq_skipspace';
3d8371be 1405 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
aab65dbd 1406 if (!empty($matches[1])){
1407 $offset += strlen($matches[1]);
451f74a2 1408 }
691a2d25 1409 return $offset;
451f74a2 1410}
a3daaaf3 1411
691a2d25 1412/**
8bd0068d 1413 * This function looks for the next character within a string. It's
1414 * really just a glorified "strpos", except it catches if failures
1415 * nicely.
1416 *
1417 * @param $body The string to look for needle in.
1418 * @param $offset Start looking from this position.
1419 * @param $needle The character/string to look for.
1420 * @return location of the next occurance of the needle, or
1421 * strlen($body) if needle wasn't found.
1422 */
691a2d25 1423function sq_findnxstr($body, $offset, $needle){
3d8371be 1424 $me = 'sq_findnxstr';
691a2d25 1425 $pos = strpos($body, $needle, $offset);
1426 if ($pos === FALSE){
1427 $pos = strlen($body);
451f74a2 1428 }
691a2d25 1429 return $pos;
451f74a2 1430}
a3daaaf3 1431
691a2d25 1432/**
8bd0068d 1433 * This function takes a PCRE-style regexp and tries to match it
1434 * within the string.
1435 *
1436 * @param $body The string to look for needle in.
1437 * @param $offset Start looking from here.
1438 * @param $reg A PCRE-style regex to match.
1439 * @return Returns a false if no matches found, or an array
1440 * with the following members:
1441 * - integer with the location of the match within $body
1442 * - string with whatever content between offset and the match
1443 * - string with whatever it is we matched
1444 */
691a2d25 1445function sq_findnxreg($body, $offset, $reg){
b583c3e8 1446 $me = 'sq_findnxreg';
691a2d25 1447 $matches = Array();
1448 $retarr = Array();
7d06541f 1449 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1450 if (!isset($matches{0}) || !$matches{0}){
691a2d25 1451 $retarr = false;
1452 } else {
1453 $retarr{0} = $offset + strlen($matches{1});
1454 $retarr{1} = $matches{1};
1455 $retarr{2} = $matches{2};
1456 }
1457 return $retarr;
1458}
a3daaaf3 1459
691a2d25 1460/**
8bd0068d 1461 * This function looks for the next tag.
1462 *
1463 * @param $body String where to look for the next tag.
1464 * @param $offset Start looking from here.
1465 * @return false if no more tags exist in the body, or
1466 * an array with the following members:
1467 * - string with the name of the tag
1468 * - array with attributes and their values
1469 * - integer with tag type (1, 2, or 3)
1470 * - integer where the tag starts (starting "<")
1471 * - integer where the tag ends (ending ">")
1472 * first three members will be false, if the tag is invalid.
1473 */
691a2d25 1474function sq_getnxtag($body, $offset){
b583c3e8 1475 $me = 'sq_getnxtag';
691a2d25 1476 if ($offset > strlen($body)){
1477 return false;
1478 }
1479 $lt = sq_findnxstr($body, $offset, "<");
1480 if ($lt == strlen($body)){
1481 return false;
1482 }
1483 /**
8bd0068d 1484 * We are here:
1485 * blah blah <tag attribute="value">
1486 * \---------^
1487 */
691a2d25 1488 $pos = sq_skipspace($body, $lt+1);
1489 if ($pos >= strlen($body)){
1490 return Array(false, false, false, $lt, strlen($body));
1491 }
1492 /**
8bd0068d 1493 * There are 3 kinds of tags:
1494 * 1. Opening tag, e.g.:
1495 * <a href="blah">
1496 * 2. Closing tag, e.g.:
1497 * </a>
1498 * 3. XHTML-style content-less tag, e.g.:
1499 * <img src="blah" />
1500 */
691a2d25 1501 $tagtype = false;
1502 switch (substr($body, $pos, 1)){
3d8371be 1503 case '/':
1504 $tagtype = 2;
1505 $pos++;
1506 break;
1507 case '!':
1508 /**
8bd0068d 1509 * A comment or an SGML declaration.
1510 */
3d8371be 1511 if (substr($body, $pos+1, 2) == "--"){
1512 $gt = strpos($body, "-->", $pos);
1513 if ($gt === false){
1514 $gt = strlen($body);
1515 } else {
1516 $gt += 2;
1517 }
1518 return Array(false, false, false, $lt, $gt);
bb8d0799 1519 } else {
3d8371be 1520 $gt = sq_findnxstr($body, $pos, ">");
1521 return Array(false, false, false, $lt, $gt);
1522 }
1523 break;
1524 default:
1525 /**
8bd0068d 1526 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1527 * later.
1528 */
3d8371be 1529 $tagtype = 1;
1530 break;
691a2d25 1531 }
a3daaaf3 1532
0493ed11 1533 $tag_start = $pos;
691a2d25 1534 $tagname = '';
1535 /**
8bd0068d 1536 * Look for next [\W-_], which will indicate the end of the tag name.
1537 */
691a2d25 1538 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1539 if ($regary == false){
1540 return Array(false, false, false, $lt, strlen($body));
1541 }
1542 list($pos, $tagname, $match) = $regary;
1543 $tagname = strtolower($tagname);
1544
1545 /**
8bd0068d 1546 * $match can be either of these:
1547 * '>' indicating the end of the tag entirely.
1548 * '\s' indicating the end of the tag name.
1549 * '/' indicating that this is type-3 xhtml tag.
1550 *
1551 * Whatever else we find there indicates an invalid tag.
1552 */
691a2d25 1553 switch ($match){
3d8371be 1554 case '/':
691a2d25 1555 /**
8bd0068d 1556 * This is an xhtml-style tag with a closing / at the
1557 * end, like so: <img src="blah" />. Check if it's followed
1558 * by the closing bracket. If not, then this tag is invalid
1559 */
3d8371be 1560 if (substr($body, $pos, 2) == "/>"){
1561 $pos++;
1562 $tagtype = 3;
1563 } else {
1564 $gt = sq_findnxstr($body, $pos, ">");
1565 $retary = Array(false, false, false, $lt, $gt);
1566 return $retary;
1567 }
1568 case '>':
1569 return Array($tagname, false, $tagtype, $lt, $pos);
1570 break;
1571 default:
1572 /**
8bd0068d 1573 * Check if it's whitespace
1574 */
3d8371be 1575 if (!preg_match('/\s/', $match)){
1576 /**
8bd0068d 1577 * This is an invalid tag! Look for the next closing ">".
1578 */
7d06541f 1579 $gt = sq_findnxstr($body, $lt, ">");
3d8371be 1580 return Array(false, false, false, $lt, $gt);
1581 }
1582 break;
691a2d25 1583 }
3d8371be 1584
691a2d25 1585 /**
8bd0068d 1586 * At this point we're here:
1587 * <tagname attribute='blah'>
1588 * \-------^
1589 *
1590 * At this point we loop in order to find all attributes.
1591 */
691a2d25 1592 $attname = '';
0493ed11 1593 $atttype = false;
691a2d25 1594 $attary = Array();
1595
1596 while ($pos <= strlen($body)){
1597 $pos = sq_skipspace($body, $pos);
1598 if ($pos == strlen($body)){
1599 /**
8bd0068d 1600 * Non-closed tag.
1601 */
691a2d25 1602 return Array(false, false, false, $lt, $pos);
1603 }
1604 /**
8bd0068d 1605 * See if we arrived at a ">" or "/>", which means that we reached
1606 * the end of the tag.
1607 */
691a2d25 1608 $matches = Array();
164800ad 1609 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
c828931c 1610 /**
8bd0068d 1611 * Yep. So we did.
1612 */
c828931c 1613 $pos += strlen($matches{1});
1614 if ($matches{2} == "/>"){
1615 $tagtype = 3;
1616 $pos++;
1617 }
1618 return Array($tagname, $attary, $tagtype, $lt, $pos);
1619 }
a3daaaf3 1620
cca46357 1621 /**
8bd0068d 1622 * There are several types of attributes, with optional
1623 * [:space:] between members.
1624 * Type 1:
1625 * attrname[:space:]=[:space:]'CDATA'
1626 * Type 2:
1627 * attrname[:space:]=[:space:]"CDATA"
1628 * Type 3:
1629 * attr[:space:]=[:space:]CDATA
1630 * Type 4:
1631 * attrname
1632 *
1633 * We leave types 1 and 2 the same, type 3 we check for
1634 * '"' and convert to "&quot" if needed, then wrap in
1635 * double quotes. Type 4 we convert into:
1636 * attrname="yes".
1637 */
3f7c623f 1638 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
691a2d25 1639 if ($regary == false){
1640 /**
8bd0068d 1641 * Looks like body ended before the end of tag.
1642 */
691a2d25 1643 return Array(false, false, false, $lt, strlen($body));
cca46357 1644 }
691a2d25 1645 list($pos, $attname, $match) = $regary;
1646 $attname = strtolower($attname);
1647 /**
8bd0068d 1648 * We arrived at the end of attribute name. Several things possible
1649 * here:
1650 * '>' means the end of the tag and this is attribute type 4
1651 * '/' if followed by '>' means the same thing as above
1652 * '\s' means a lot of things -- look what it's followed by.
1653 * anything else means the attribute is invalid.
1654 */
691a2d25 1655 switch($match){
3d8371be 1656 case '/':
691a2d25 1657 /**
8bd0068d 1658 * This is an xhtml-style tag with a closing / at the
1659 * end, like so: <img src="blah" />. Check if it's followed
1660 * by the closing bracket. If not, then this tag is invalid
1661 */
3d8371be 1662 if (substr($body, $pos, 2) == "/>"){
691a2d25 1663 $pos++;
3d8371be 1664 $tagtype = 3;
691a2d25 1665 } else {
3d8371be 1666 $gt = sq_findnxstr($body, $pos, ">");
1667 $retary = Array(false, false, false, $lt, $gt);
1668 return $retary;
1669 }
1670 case '>':
1671 $attary{$attname} = '"yes"';
1672 return Array($tagname, $attary, $tagtype, $lt, $pos);
1673 break;
1674 default:
1675 /**
8bd0068d 1676 * Skip whitespace and see what we arrive at.
1677 */
3d8371be 1678 $pos = sq_skipspace($body, $pos);
1679 $char = substr($body, $pos, 1);
1680 /**
8bd0068d 1681 * Two things are valid here:
1682 * '=' means this is attribute type 1 2 or 3.
1683 * \w means this was attribute type 4.
1684 * anything else we ignore and re-loop. End of tag and
1685 * invalid stuff will be caught by our checks at the beginning
1686 * of the loop.
1687 */
3d8371be 1688 if ($char == "="){
1689 $pos++;
1690 $pos = sq_skipspace($body, $pos);
691a2d25 1691 /**
8bd0068d 1692 * Here are 3 possibilities:
1693 * "'" attribute type 1
1694 * '"' attribute type 2
1695 * everything else is the content of tag type 3
1696 */
3d8371be 1697 $quot = substr($body, $pos, 1);
1698 if ($quot == "'"){
1699 $regary = sq_findnxreg($body, $pos+1, "\'");
1700 if ($regary == false){
1701 return Array(false, false, false, $lt, strlen($body));
1702 }
1703 list($pos, $attval, $match) = $regary;
1704 $pos++;
1705 $attary{$attname} = "'" . $attval . "'";
1706 } else if ($quot == '"'){
1707 $regary = sq_findnxreg($body, $pos+1, '\"');
1708 if ($regary == false){
1709 return Array(false, false, false, $lt, strlen($body));
1710 }
1711 list($pos, $attval, $match) = $regary;
1712 $pos++;
1713 $attary{$attname} = '"' . $attval . '"';
1714 } else {
1715 /**
8bd0068d 1716 * These are hateful. Look for \s, or >.
1717 */
3d8371be 1718 $regary = sq_findnxreg($body, $pos, "[\s>]");
1719 if ($regary == false){
1720 return Array(false, false, false, $lt, strlen($body));
1721 }
1722 list($pos, $attval, $match) = $regary;
1723 /**
8bd0068d 1724 * If it's ">" it will be caught at the top.
1725 */
3d8371be 1726 $attval = preg_replace("/\"/s", "&quot;", $attval);
1727 $attary{$attname} = '"' . $attval . '"';
7e235a1a 1728 }
3d8371be 1729 } else if (preg_match("|[\w/>]|", $char)) {
691a2d25 1730 /**
8bd0068d 1731 * That was attribute type 4.
1732 */
3d8371be 1733 $attary{$attname} = '"yes"';
1734 } else {
1735 /**
8bd0068d 1736 * An illegal character. Find next '>' and return.
1737 */
3d8371be 1738 $gt = sq_findnxstr($body, $pos, ">");
1739 return Array(false, false, false, $lt, $gt);
451f74a2 1740 }
3d8371be 1741 break;
691a2d25 1742 }
1743 }
1744 /**
8bd0068d 1745 * The fact that we got here indicates that the tag end was never
1746 * found. Return invalid tag indication so it gets stripped.
1747 */
691a2d25 1748 return Array(false, false, false, $lt, strlen($body));
1749}
1750
1751/**
0493ed11 1752 * Translates entities into literal values so they can be checked.
8bd0068d 1753 *
0493ed11 1754 * @param $attvalue the by-ref value to check.
1755 * @param $regex the regular expression to check against.
1756 * @param $hex whether the entites are hexadecimal.
1757 * @return True or False depending on whether there were matches.
8bd0068d 1758 */
0493ed11 1759function sq_deent(&$attvalue, $regex, $hex=false){
b583c3e8 1760 $me = 'sq_deent';
0493ed11 1761 $ret_match = false;
2b665f28 1762 // remove comments
1763 //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
0493ed11 1764 preg_match_all($regex, $attvalue, $matches);
1765 if (is_array($matches) && sizeof($matches[0]) > 0){
1766 $repl = Array();
1767 for ($i = 0; $i < sizeof($matches[0]); $i++){
1768 $numval = $matches[1][$i];
1769 if ($hex){
1770 $numval = hexdec($numval);
a3daaaf3 1771 }
0493ed11 1772 $repl{$matches[0][$i]} = chr($numval);
691a2d25 1773 }
0493ed11 1774 $attvalue = strtr($attvalue, $repl);
1775 return true;
1776 } else {
1777 return false;
691a2d25 1778 }
691a2d25 1779}
1780
1781/**
8bd0068d 1782 * This function runs various checks against the attributes.
1783 *
1784 * @param $tagname String with the name of the tag.
1785 * @param $attary Array with all tag attributes.
1786 * @param $rm_attnames See description for sq_sanitize
1787 * @param $bad_attvals See description for sq_sanitize
1788 * @param $add_attr_to_tag See description for sq_sanitize
1789 * @param $message message object
1790 * @param $id message id
1791 * @return Array with modified attributes.
1792 */
da2415c1 1793function sq_fixatts($tagname,
1794 $attary,
691a2d25 1795 $rm_attnames,
1796 $bad_attvals,
1797 $add_attr_to_tag,
1798 $message,
b3af12ef 1799 $id,
3d8371be 1800 $mailbox
691a2d25 1801 ){
b583c3e8 1802 $me = 'sq_fixatts';
691a2d25 1803 while (list($attname, $attvalue) = each($attary)){
1804 /**
8bd0068d 1805 * See if this attribute should be removed.
1806 */
691a2d25 1807 foreach ($rm_attnames as $matchtag=>$matchattrs){
1808 if (preg_match($matchtag, $tagname)){
1809 foreach ($matchattrs as $matchattr){
1810 if (preg_match($matchattr, $attname)){
1811 unset($attary{$attname});
1812 continue;
1813 }
451f74a2 1814 }
451f74a2 1815 }
691a2d25 1816 }
1817 /**
2b665f28 1818 * Workaround for IE quirks
1819 */
1820 sq_fixIE_idiocy($attvalue);
1821
1822 /**
8bd0068d 1823 * Remove any backslashes, entities, and extraneous whitespace.
1824 */
2b665f28 1825
1826 $oldattvalue = $attvalue;
0493ed11 1827 sq_defang($attvalue);
2b665f28 1828 if ($attname == 'style' && $attvalue !== $oldattvalue) {
1829 // entities are used in the attribute value. In 99% of the cases it's there as XSS
1830 // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1831 $attvalue = "idiocy";
1832 $attary{$attname} = $attvalue;
1833 }
0493ed11 1834 sq_unspace($attvalue);
af861a34 1835
1836 /**
8bd0068d 1837 * Now let's run checks on the attvalues.
1838 * I don't expect anyone to comprehend this. If you do,
1839 * get in touch with me so I can drive to where you live and
1840 * shake your hand personally. :)
1841 */
691a2d25 1842 foreach ($bad_attvals as $matchtag=>$matchattrs){
1843 if (preg_match($matchtag, $tagname)){
1844 foreach ($matchattrs as $matchattr=>$valary){
1845 if (preg_match($matchattr, $attname)){
1846 /**
8bd0068d 1847 * There are two arrays in valary.
1848 * First is matches.
1849 * Second one is replacements
1850 */
691a2d25 1851 list($valmatch, $valrepl) = $valary;
da2415c1 1852 $newvalue =
691a2d25 1853 preg_replace($valmatch, $valrepl, $attvalue);
1854 if ($newvalue != $attvalue){
1855 $attary{$attname} = $newvalue;
567dc524 1856 $attvalue = $newvalue;
691a2d25 1857 }
1858 }
1859 }
451f74a2 1860 }
a3daaaf3 1861 }
567dc524 1862 if ($attname == 'style') {
1863 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1864 // 8bit and control characters in style attribute values can be used for XSS, remove them
1865 $attary{$attname} = '"disallowed character"';
1866 }
1867 preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1868 if (count($aMatch)) {
1869 foreach($aMatch[1] as $sMatch) {
1870 // url value
1871 $urlvalue = $sMatch;
1872 sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1873 $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1874 }
1875 }
691a2d25 1876 }
ff940ebc 1877 /**
567dc524 1878 * Use white list based filtering on attributes which can contain url's
ff940ebc 1879 */
caf0ab1d 1880 else if ($attname == 'href' || $attname == 'xlink:href' || $attname == 'src'
1881 || $attname == 'poster' || $attname == 'formaction'
1882 || $attname == 'background' || $attname == 'action') {
567dc524 1883 sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1884 $attary{$attname} = $attvalue;
ff940ebc 1885 }
a3daaaf3 1886 }
691a2d25 1887 /**
8bd0068d 1888 * See if we need to append any attributes to this tag.
1889 */
691a2d25 1890 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1891 if (preg_match($matchtag, $tagname)){
1892 $attary = array_merge($attary, $addattary);
1893 }
1894 }
1895 return $attary;
451f74a2 1896}
a3daaaf3 1897
691a2d25 1898/**
567dc524 1899 * This function filters url's
1900 *
1901 * @param $attvalue String with attribute value to filter
1902 * @param $message message object
1903 * @param $id message id
1904 * @param $mailbox mailbox
1905 * @param $sQuote quoting characters around url's
1906 */
1907function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1908 $attvalue = trim($attvalue);
1909 if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1910 // remove the double quotes
1911 $sQuote = $attvalue[0];
1912 $attvalue = trim(substr($attvalue,1,-1));
1913 }
1914
d31f73f1 1915 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
1916 // images off by default.
afbf184c 1917 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
d31f73f1 1918
6ab8321f 1919 global $use_transparent_security_image;
1920 if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
1921 else $secremoveimg = '../images/' . _("sec_remove_eng.png");
567dc524 1922
1923 /**
1924 * Replace empty src tags with the blank image. src is only used
1925 * for frames, images, and image inputs. Doing a replace should
1926 * not affect them working as should be, however it will stop
1927 * IE from being kicked off when src for img tags are not set
1928 */
1929 if ($attvalue == '') {
1930 $attvalue = '"' . SM_PATH . 'images/blank.png"';
1931 } else {
1932 // first, disallow 8 bit characters and control characters
1933 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1934 switch ($attname) {
1935 case 'href':
1936 $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1937 break;
1938 default:
1939 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1940 break;
1941 }
1942 } else {
1943 $aUrl = parse_url($attvalue);
1944 if (isset($aUrl['scheme'])) {
1945 switch(strtolower($aUrl['scheme'])) {
d75e755b 1946 case 'mailto':
567dc524 1947 case 'http':
1948 case 'https':
1949 case 'ftp':
1950 if ($attname != 'href') {
1951 if ($view_unsafe_images == false) {
1952 $attvalue = $sQuote . $secremoveimg . $sQuote;
1953 } else {
1954 if (isset($aUrl['path'])) {
8bbbc757 1955
1956 // No one has been able to show that image URIs
1957 // can be exploited, so for now, no restrictions
1958 // are made at all. If this proves to be a problem,
1959 // the commented-out code below can be of help.
1960 // (One consideration is that I see nothing in this
1961 // function that specifically says that we will
1962 // only ever arrive here when inspecting an image
1963 // tag, although that does seem to be the end
1964 // result - e.g., <script src="..."> where malicious
1965 // image URIs are in fact a problem are already
1966 // filtered out elsewhere.
1967 /* ---------------------------------
567dc524 1968 // validate image extension.
1969 $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1970 if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
8bbbc757 1971 // If URI is to something other than
1972 // a regular image file, get the contents
1973 // and try to see if it is an image.
1974 // Don't use Fileinfo (finfo_file()) because
1975 // we'd need to make the admin configure the
1976 // location of the magic.mime file (FIXME: add finfo_file() support later?)
1977 //
1978 $mime_type = '';
1979 if (function_exists('mime_content_type')
1980 && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
1981
1982 // fetch file
1983 //
1984 $file_contents = '';
1985 while (!feof($FILE)) {
1986 $file_contents .= fread($FILE, 8192);
1987 }
1988 fclose($FILE);
1989
1990 // store file locally
1991 //
1992 global $attachment_dir, $username;
1993 $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
1994 $localfilename = GenerateRandomString(32, '', 7);
1995 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1996 while (file_exists($full_localfilename)) {
1997 $localfilename = GenerateRandomString(32, '', 7);
1998 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1999 }
2000 $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
2001 fwrite($FILE, $file_contents);
2002 fclose($FILE);
2003
2004 // get mime type and remove file
2005 //
2006 $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
2007 unlink("$hashed_attachment_dir/$localfilename");
2008 }
2009 // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
2010 if (substr(strtolower($mime_type), 0, 5) != 'image') {
2011 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
2012 }
567dc524 2013 }
8bbbc757 2014 --------------------------------- */
567dc524 2015 } else {
2016 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
2017 }
2018 }
cf088f55 2019 } else {
2020 $attvalue = $sQuote . $attvalue . $sQuote;
567dc524 2021 }
2022 break;
2023 case 'outbind':
2024 /**
2025 * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
2026 * One day MS might actually make it match something useful, for now, falling
2027 * back to using cid2http, so we can grab the blank.png.
2028 */
cf088f55 2029 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 2030 break;
2031 case 'cid':
2032 /**
2033 * Turn cid: urls into http-friendly ones.
2034 */
cf088f55 2035 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 2036 break;
2037 default:
2038 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2039 break;
2040 }
2041 } else {
b1fbb25f 2042 if (!isset($aUrl['path']) || $aUrl['path'] != $secremoveimg) {
567dc524 2043 // parse_url did not lead to satisfying result
2044 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2045 }
2046 }
2047 }
2048 }
2049}
2050
2051/**
8bd0068d 2052 * This function edits the style definition to make them friendly and
2053 * usable in SquirrelMail.
2054 *
2055 * @param $message the message object
2056 * @param $id the message id
2057 * @param $content a string with whatever is between <style> and </style>
2058 * @param $mailbox the message mailbox
2059 * @return a string with edited content.
2060 */
e60a299a 2061function sq_fixstyle($body, $pos, $message, $id, $mailbox){
b583c3e8 2062 $me = 'sq_fixstyle';
7e2ff844 2063 // workaround for </style> in between comments
2064 $iCurrentPos = $pos;
2065 $content = '';
2066 $sToken = '';
2067 $bSucces = false;
2068 $bEndTag = false;
2069 for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
2070 $char = $body{$i};
2071 switch ($char) {
2072 case '<':
10c0caeb 2073 $sToken = $char;
7e2ff844 2074 break;
2075 case '/':
2076 if ($sToken == '<') {
2077 $sToken .= $char;
2078 $bEndTag = true;
2079 } else {
2080 $content .= $char;
2081 }
2082 break;
2083 case '>':
2084 if ($bEndTag) {
2085 $sToken .= $char;
2086 if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
2087 $newpos = $i + 1;
2088 $bSucces = true;
2089 break 2;
2090 } else {
2091 $content .= $sToken;
2092 }
2093 $bEndTag = false;
2094 } else {
2095 $content .= $char;
2096 }
2097 break;
2098 case '!':
2099 if ($sToken == '<') {
2100 // possible comment
2101 if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
2102 $i = strpos($body,'-->',$i+3);
2b665f28 2103 if ($i === false) { // no end comment
2104 $i = strlen($body);
2105 }
7e2ff844 2106 $sToken = '';
2107 }
2108 } else {
2109 $content .= $char;
2110 }
2111 break;
2112 default:
2113 if ($bEndTag) {
2114 $sToken .= $char;
2115 } else {
2116 $content .= $char;
2117 }
2118 break;
2119 }
2120 }
2121 if ($bSucces == FALSE){
7d06541f 2122 return array(FALSE, strlen($body));
2123 }
7e2ff844 2124
2b665f28 2125
2126
691a2d25 2127 /**
9ebace19 2128 * First look for general BODY style declaration, which would be
2129 * like so:
2130 * body {background: blah-blah}
2131 * and change it to .bodyclass so we can just assign it to a <div>
2132 */
7732acc6 2133 // $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
d2f3a6fb 2134 // Nah, this is even better - try to preface all CSS selectors with
2135 // our <div> class ID "bodyclass" then correct generic "body" selectors
2136 // TODO: this works pretty good but breaks stuff like this:
2137 // @media print { body { font-size: 10pt; } }
2138 // but there isn't an easy way to make this regex skip @media
2139 // definitions... though lots of the ones in the wild will be
2140 // correctly handled because they tend to end with a parenthesis, like:
2141 // @media screen and (max-width:480px) { ...
2142 $content = preg_replace('/([a-z0-9._-][a-z0-9 >+~|:._-]*\s*(?:,|{.*?}))/si', '.bodyclass $1', $content);
2143 $content = str_replace('.bodyclass body', '.bodyclass', $content);
6ab8321f 2144
2145 global $use_transparent_security_image;
2146 if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
2147 else $secremoveimg = '../images/' . _("sec_remove_eng.png");
2148
691a2d25 2149 /**
0493ed11 2150 * Fix url('blah') declarations.
2151 */
2152 // $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
2153 // "url(\\1$secremoveimg\\2)", $content);
2b665f28 2154
567dc524 2155 // first check for 8bit sequences and disallowed control characters
2156 if (preg_match('/[\16-\37\200-\377]+/',$content)) {
2157 $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
2158 return array($content, $newpos);
2159 }
2160
2b665f28 2161 // IE Sucks hard. We have a special function for it.
2162 sq_fixIE_idiocy($content);
2163
2164 // remove @import line
2165 $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2166
5b4884be 2167 // translate ur\l and variations (IE parses that)
2b665f28 2168 // TODO check if the sq_fixIE_idiocy function already handles this.
5b4884be 2169 $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
567dc524 2170 preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2171 if (count($aMatch)) {
2172 $aValue = $aReplace = array();
2173 foreach($aMatch[1] as $sMatch) {
2174 // url value
2175 $urlvalue = $sMatch;
2176 sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2177 $aValue[] = $sMatch;
2178 $aReplace[] = $urlvalue;
0493ed11 2179 }
567dc524 2180 $content = str_replace($aValue,$aReplace,$content);
691a2d25 2181 }
567dc524 2182
9ebace19 2183 /**
2184 * Remove any backslashes, entities, and extraneous whitespace.
2185 */
0493ed11 2186 $contentTemp = $content;
2187 sq_defang($contentTemp);
2188 sq_unspace($contentTemp);
a3daaaf3 2189
691a2d25 2190 /**
8bd0068d 2191 * Fix stupid css declarations which lead to vulnerabilities
2192 * in IE.
39352565 2193 *
2194 * Also remove "position" attribute, as it can easily be set
2195 * to "fixed" or "absolute" with "left" and "top" attributes
2196 * of zero, taking over the whole content frame. It can also
2197 * be set to relative and move itself anywhere it wants to,
2198 * displaying content in areas it shouldn't be allowed to touch.
8bd0068d 2199 */
caf0ab1d 2200 $match = Array('/\/\*.*\*\//', // removes /* blah blah */
5db90261 2201 '/expression/i',
0493ed11 2202 '/behaviou*r/i',
2203 '/binding/i',
2b665f28 2204 '/include-source/i',
2205 '/javascript/i',
39352565 2206 '/script/i',
2207 '/position/i');
2208 $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
0493ed11 2209 $contentNew = preg_replace($match, $replace, $contentTemp);
2210 if ($contentNew !== $contentTemp) {
2211 // insecure css declarations are used. From now on we don't care
2212 // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2213 $content = $contentNew;
2214 }
7d06541f 2215 return array($content, $newpos);
691a2d25 2216}
a3daaaf3 2217
0493ed11 2218
691a2d25 2219/**
8bd0068d 2220 * This function converts cid: url's into the ones that can be viewed in
2221 * the browser.
2222 *
2223 * @param $message the message object
2224 * @param $id the message id
2225 * @param $cidurl the cid: url.
2226 * @param $mailbox the message mailbox
2227 * @return a string with a http-friendly url
2228 */
b3af12ef 2229function sq_cid2http($message, $id, $cidurl, $mailbox){
691a2d25 2230 /**
8bd0068d 2231 * Get rid of quotes.
2232 */
691a2d25 2233 $quotchar = substr($cidurl, 0, 1);
2dd879b8 2234 if ($quotchar == '"' || $quotchar == "'"){
2235 $cidurl = str_replace($quotchar, "", $cidurl);
2236 } else {
2237 $quotchar = '';
2238 }
691a2d25 2239 $cidurl = substr(trim($cidurl), 4);
0493ed11 2240
2241 $match_str = '/\{.*?\}\//';
2242 $str_rep = '';
2243 $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2244
e5e9381a 2245 $linkurl = find_ent_id($cidurl, $message);
9ebace19 2246 /* in case of non-safe cid links $httpurl should be replaced by a sort of
2247 unsafe link image */
e5e9381a 2248 $httpurl = '';
c8f5f606 2249
8bd0068d 2250 /**
2251 * This is part of a fix for Outlook Express 6.x generating
2252 * cid URLs without creating content-id headers. These images are
2253 * not part of the multipart/related html mail. The html contains
2254 * <img src="cid:{some_id}/image_filename.ext"> references to
2255 * attached images with as goal to render them inline although
2256 * the attachment disposition property is not inline.
2257 */
c8f5f606 2258
2259 if (empty($linkurl)) {
2260 if (preg_match('/{.*}\//', $cidurl)) {
2261 $cidurl = preg_replace('/{.*}\//','', $cidurl);
2262 if (!empty($cidurl)) {
2263 $linkurl = find_ent_id($cidurl, $message);
2264 }
2265 }
2266 }
f8a1ed5a 2267
c8f5f606 2268 if (!empty($linkurl)) {
fa26ab45 2269 $httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&amp;' .
8bd0068d 2270 "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2271 '&amp;ent_id=' . $linkurl . $quotchar;
c8f5f606 2272 } else {
2273 /**
2274 * If we couldn't generate a proper img url, drop in a blank image
2275 * instead of sending back empty, otherwise it causes unusual behaviour
2276 */
bc017c1d 2277 $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
e5e9381a 2278 }
f8a1ed5a 2279
691a2d25 2280 return $httpurl;
2281}
2282
2283/**
8bd0068d 2284 * This function changes the <body> tag into a <div> tag since we
2285 * can't really have a body-within-body.
2286 *
2287 * @param $attary an array of attributes and values of <body>
2288 * @param $mailbox mailbox we're currently reading (for cid2http)
2289 * @param $message current message (for cid2http)
2290 * @param $id current message id (for cid2http)
2291 * @return a modified array of attributes to be set for <div>
2292 */
2dd879b8 2293function sq_body2div($attary, $mailbox, $message, $id){
b583c3e8 2294 $me = 'sq_body2div';
3d8371be 2295 $divattary = Array('class' => "'bodyclass'");
b583c3e8 2296 $text = '#000000';
c189a963 2297 $has_bgc_stl = $has_txt_stl = false;
b583c3e8 2298 $styledef = '';
691a2d25 2299 if (is_array($attary) && sizeof($attary) > 0){
2300 foreach ($attary as $attname=>$attvalue){
2301 $quotchar = substr($attvalue, 0, 1);
2302 $attvalue = str_replace($quotchar, "", $attvalue);
2303 switch ($attname){
3d8371be 2304 case 'background':
8bd0068d 2305 $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
3d8371be 2306 $styledef .= "background-image: url('$attvalue'); ";
2307 break;
2308 case 'bgcolor':
c189a963 2309 $has_bgc_stl = true;
3d8371be 2310 $styledef .= "background-color: $attvalue; ";
2311 break;
2312 case 'text':
c189a963 2313 $has_txt_stl = true;
3d8371be 2314 $styledef .= "color: $attvalue; ";
2315 break;
691a2d25 2316 }
a3daaaf3 2317 }
c189a963 2318 // Outlook defines a white bgcolor and no text color. This can lead to
2319 // white text on a white bg with certain themes.
2320 if ($has_bgc_stl && !$has_txt_stl) {
2321 $styledef .= "color: $text; ";
2322 }
691a2d25 2323 if (strlen($styledef) > 0){
2324 $divattary{"style"} = "\"$styledef\"";
2325 }
2326 }
2327 return $divattary;
2328}
a3daaaf3 2329
691a2d25 2330/**
8bd0068d 2331 * This is the main function and the one you should actually be calling.
2332 * There are several variables you should be aware of an which need
2333 * special description.
2334 *
2335 * Since the description is quite lengthy, see it here:
2336 * http://linux.duke.edu/projects/mini/htmlfilter/
2337 *
2338 * @param $body the string with HTML you wish to filter
2339 * @param $tag_list see description above
2340 * @param $rm_tags_with_content see description above
2341 * @param $self_closing_tags see description above
2342 * @param $force_tag_closing see description above
2343 * @param $rm_attnames see description above
2344 * @param $bad_attvals see description above
2345 * @param $add_attr_to_tag see description above
2346 * @param $message message object
2347 * @param $id message id
dfc64d14 2348 * @param $recursively_called boolean flag for recursive calls into this function (optional; default FALSE)
8bd0068d 2349 * @return sanitized html safe to show on your pages.
2350 */
da2415c1 2351function sq_sanitize($body,
8bd0068d 2352 $tag_list,
2353 $rm_tags_with_content,
2354 $self_closing_tags,
2355 $force_tag_closing,
2356 $rm_attnames,
2357 $bad_attvals,
2358 $add_attr_to_tag,
2359 $message,
2360 $id,
dfc64d14 2361 $mailbox,
2362 $recursively_called=FALSE
8bd0068d 2363 ){
b583c3e8 2364 $me = 'sq_sanitize';
dfc64d14 2365
2366 /**
2367 * See if tag_list is of tags to remove or tags to allow.
2368 * false means remove these tags
2369 * true means allow these tags
2370 */
2371 $orig_tag_list = $tag_list;
7d06541f 2372 $rm_tags = array_shift($tag_list);
dfc64d14 2373
691a2d25 2374 /**
8bd0068d 2375 * Normalize rm_tags and rm_tags_with_content.
2376 */
7d06541f 2377 @array_walk($tag_list, 'sq_casenormalize');
691a2d25 2378 @array_walk($rm_tags_with_content, 'sq_casenormalize');
2379 @array_walk($self_closing_tags, 'sq_casenormalize');
dfc64d14 2380
691a2d25 2381 $curpos = 0;
2382 $open_tags = Array();
2dd879b8 2383 $trusted = "\n<!-- begin sanitized html -->\n";
691a2d25 2384 $skip_content = false;
bb8d0799 2385 /**
8bd0068d 2386 * Take care of netscape's stupid javascript entities like
2387 * &{alert('boo')};
2388 */
bb8d0799 2389 $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
691a2d25 2390
7d06541f 2391 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
691a2d25 2392 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
dfc64d14 2393
2394 /**
2395 * RCDATA and RAWTEXT tags are handled differently:
2396 * next instance of closing tag is used, whether or not
2397 * the HTML is well formed before that
2398 */
2399 global $rcdata_rawtext_tags;
2400 if (!$recursively_called
2401 && in_array($tagname, $rcdata_rawtext_tags)
2402 && $tagtype === 1){
2403 $closing_tag = false;
2404 $closing_tag_offset = $curpos;
2405 // seek out the closing tag for the current RCDATA/RAWTEXT tag
2406 while (1) {
2407 // first we need to move forward to next available closing tag
2408 // (intentionally leave off the closing > and let sq_getnxtag() validate a proper tag syntax)
2409 $next_tag = sq_findnxreg($body, $closing_tag_offset, "</\s*$tagname");
2410 if ($next_tag === false) {
2411 $closing_tag = false;
2412 break;
2413 }
2414 // but then we have to make sure it's a well-formed tag
2415 $closing_tag = sq_getnxtag($body, $next_tag[0]);
2416 if ($closing_tag === false)
2417 break;
2418 else if ($closing_tag[0] !== false
2419 // these should be redundant
2420 && $closing_tag[0] === $tagname && $closing_tag[2] === 2) {
2421 $trusted .= sq_sanitize(substr($body, $curpos, $closing_tag[4] - $curpos + 1),
2422 $orig_tag_list, $rm_tags_with_content, $self_closing_tags,
2423 $force_tag_closing, $rm_attnames, $bad_attvals, $add_attr_to_tag,
2424 $message, $id, $mailbox, true);
2425 $curpos = $closing_tag[4] + 1;
2426 continue 2;
2427 }
2428 $closing_tag_offset = $next_tag[0] + 1;
2429 }
2430 if ($closing_tag === false)
2431 { /* no-op... there was no closing tag for this RCDATA/RAWTEXT tag - we could probably set $curpos to the end of $body, but this HTML is malformed anyway and should just fall apart on its own */ }
2432 }
2433
691a2d25 2434 $free_content = substr($body, $curpos, $lt-$curpos);
2435 /**
8bd0068d 2436 * Take care of <style>
2437 */
7d06541f 2438 if ($tagname == "style" && $tagtype == 1){
da2415c1 2439 list($free_content, $curpos) =
e60a299a 2440 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
7d06541f 2441 if ($free_content != FALSE){
1d398b1d 2442 if ( !empty($attary) ) {
2443 $attary = sq_fixatts($tagname,
2444 $attary,
2445 $rm_attnames,
2446 $bad_attvals,
2447 $add_attr_to_tag,
2448 $message,
2449 $id,
2450 $mailbox
2451 );
2452 }
7d06541f 2453 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2454 $trusted .= $free_content;
2455 $trusted .= sq_tagprint($tagname, false, 2);
2456 }
2457 continue;
691a2d25 2458 }
2459 if ($skip_content == false){
2460 $trusted .= $free_content;
691a2d25 2461 }
2462 if ($tagname != FALSE){
2463 if ($tagtype == 2){
2464 if ($skip_content == $tagname){
2465 /**
8bd0068d 2466 * Got to the end of tag we needed to remove.
2467 */
691a2d25 2468 $tagname = false;
2469 $skip_content = false;
2470 } else {
2471 if ($skip_content == false){
c828931c 2472 if ($tagname == "body"){
2473 $tagname = "div";
2dd879b8 2474 }
da2415c1 2475 if (isset($open_tags{$tagname}) &&
8bd0068d 2476 $open_tags{$tagname} > 0){
2dd879b8 2477 $open_tags{$tagname}--;
691a2d25 2478 } else {
2dd879b8 2479 $tagname = false;
691a2d25 2480 }
691a2d25 2481 }
2482 }
2483 } else {
2484 /**
8bd0068d 2485 * $rm_tags_with_content
2486 */
691a2d25 2487 if ($skip_content == false){
2488 /**
8bd0068d 2489 * See if this is a self-closing type and change
2490 * tagtype appropriately.
2491 */
691a2d25 2492 if ($tagtype == 1
8bd0068d 2493 && in_array($tagname, $self_closing_tags)){
2dd879b8 2494 $tagtype = 3;
691a2d25 2495 }
2496 /**
8bd0068d 2497 * See if we should skip this tag and any content
2498 * inside it.
2499 */
691a2d25 2500 if ($tagtype == 1 &&
8bd0068d 2501 in_array($tagname, $rm_tags_with_content)){
691a2d25 2502 $skip_content = $tagname;
2503 } else {
da2415c1 2504 if (($rm_tags == false
8bd0068d 2505 && in_array($tagname, $tag_list)) ||
2506 ($rm_tags == true &&
2507 !in_array($tagname, $tag_list))){
691a2d25 2508 $tagname = false;
2509 } else {
2dd879b8 2510 /**
8bd0068d 2511 * Convert body into div.
2512 */
2dd879b8 2513 if ($tagname == "body"){
2514 $tagname = "div";
da2415c1 2515 $attary = sq_body2div($attary, $mailbox,
8bd0068d 2516 $message, $id);
2dd879b8 2517 }
691a2d25 2518 if ($tagtype == 1){
2519 if (isset($open_tags{$tagname})){
2520 $open_tags{$tagname}++;
2521 } else {
2522 $open_tags{$tagname}=1;
2523 }
2524 }
2525 /**
8bd0068d 2526 * This is where we run other checks.
2527 */
691a2d25 2528 if (is_array($attary) && sizeof($attary) > 0){
2529 $attary = sq_fixatts($tagname,
8bd0068d 2530 $attary,
2531 $rm_attnames,
2532 $bad_attvals,
2533 $add_attr_to_tag,
2534 $message,
2535 $id,
2536 $mailbox
2537 );
691a2d25 2538 }
2539 }
2540 }
691a2d25 2541 }
2542 }
2543 if ($tagname != false && $skip_content == false){
2544 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2545 }
691a2d25 2546 }
2547 $curpos = $gt+1;
a3daaaf3 2548 }
691a2d25 2549 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2550 if ($force_tag_closing == true){
2551 foreach ($open_tags as $tagname=>$opentimes){
2552 while ($opentimes > 0){
2553 $trusted .= '</' . $tagname . '>';
2554 $opentimes--;
2555 }
2556 }
2557 $trusted .= "\n";
2558 }
2559 $trusted .= "<!-- end sanitized html -->\n";
2560 return $trusted;
2561}
451f74a2 2562
691a2d25 2563/**
8bd0068d 2564 * This is a wrapper function to call html sanitizing routines.
2565 *
2566 * @param $body the body of the message
2567 * @param $id the id of the message
c189a963 2568
2569 * @param $message
2570 * @param $mailbox
2571 * @param boolean $take_mailto_links When TRUE, converts mailto: links
2572 * into internal SM compose links
2573 * (optional; default = TRUE)
8bd0068d 2574 * @return a string with html safe to display in the browser.
2575 */
c189a963 2576function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2577
202bcbcc 2578 // require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
c189a963 2579
691a2d25 2580 global $attachment_common_show_images, $view_unsafe_images,
dfc64d14 2581 $has_unsafe_images, $allow_svg_display, $rcdata_rawtext_tags,
2582 $remove_rcdata_rawtext_tags_and_content;
2583
2584 $rcdata_rawtext_tags = array(
2585 "noscript",
2586 "noframes",
2587 "noembed",
2588 "textarea",
2589 // also "title", "xmp", "script", "iframe", "plaintext" which we already remove below
2590 );
2591
691a2d25 2592 /**
8bd0068d 2593 * Don't display attached images in HTML mode.
2b665f28 2594 *
d0187bd6 2595 * SB: why?
8bd0068d 2596 */
691a2d25 2597 $attachment_common_show_images = false;
2598 $tag_list = Array(
dfc64d14 2599 false, // remove these tags
8bd0068d 2600 "meta",
2601 "html",
2602 "head",
2603 "base",
2604 "link",
2605 "frame",
2606 "iframe",
2607 "plaintext",
caf0ab1d 2608 "marquee",
8bd0068d 2609 );
691a2d25 2610
2611 $rm_tags_with_content = Array(
8bd0068d 2612 "script",
caf0ab1d 2613 "object",
8bd0068d 2614 "applet",
2615 "embed",
2616 "title",
2617 "frameset",
0493ed11 2618 "xmp",
caf0ab1d 2619 "xml",
8bd0068d 2620 );
c88cef21 2621 if (!$allow_svg_display)
caf0ab1d 2622 $rm_tags_with_content[] = 'svg';
dfc64d14 2623 /**
2624 * SquirrelMail will parse RCDATA and RAWTEXT tags and handle them as the special
2625 * case that they are, but if you prefer to remove them and their contents entirely
2626 * (in most cases, should be a safe thing with minimal impact), you can add the
2627 * following to config/config_local.php
2628 * $remove_rcdata_rawtext_tags_and_content = TRUE;
2629 */
2630 if ($remove_rcdata_rawtext_tags_and_content)
2631 $rm_tags_with_content = array_merge($rm_tags_with_content, $rcdata_rawtext_tags);
691a2d25 2632
2633 $self_closing_tags = Array(
8bd0068d 2634 "img",
2635 "br",
2636 "hr",
2637 "input",
caf0ab1d 2638 "outbind",
8bd0068d 2639 );
691a2d25 2640
2dd879b8 2641 $force_tag_closing = true;
691a2d25 2642
2643 $rm_attnames = Array(
8bd0068d 2644 "/.*/" =>
2645 Array(
2646 "/target/i",
2647 "/^on.*/i",
2648 "/^dynsrc/i",
2649 "/^data.*/i",
caf0ab1d 2650 "/^lowsrc.*/i",
8bd0068d 2651 )
2652 );
691a2d25 2653
6ab8321f 2654 global $use_transparent_security_image;
2655 if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
2656 else $secremoveimg = '../images/' . _("sec_remove_eng.png");
2657
691a2d25 2658 $bad_attvals = Array(
8bd0068d 2659 "/.*/" =>
691a2d25 2660 Array(
0a6ec9b5 2661 "/^src|background/i" =>
8bd0068d 2662 Array(
691a2d25 2663 Array(
8bd0068d 2664 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2665 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2666 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
691a2d25 2667 ),
8bd0068d 2668 Array(
2669 "\\1$secremoveimg\\2",
2670 "\\1$secremoveimg\\2",
2671 "\\1$secremoveimg\\2",
8bd0068d 2672 )
2673 ),
0a6ec9b5 2674 "/^href|action/i" =>
8bd0068d 2675 Array(
0a6ec9b5 2676 Array(
8bd0068d 2677 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2678 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2679 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
0a6ec9b5 2680 ),
691a2d25 2681 Array(
8bd0068d 2682 "\\1#\\1",
2683 "\\1#\\1",
8bd0068d 2684 "\\1#\\1"
02474e43 2685 )
8bd0068d 2686 ),
2687 "/^style/i" =>
2688 Array(
2689 Array(
5db90261 2690 "/\/\*.*\*\//",
8bd0068d 2691 "/expression/i",
2692 "/binding/i",
2693 "/behaviou*r/i",
2694 "/include-source/i",
39352565 2695
2696 // position:relative can also be exploited
2697 // to put content outside of email body area
2698 // and position:fixed is similarly exploitable
2699 // as position:absolute, so we'll remove it
2700 // altogether....
2701 //
2702 // Does this screw up legitimate HTML messages?
2703 // If so, the only fix I see is to allow position
2704 // attributes (any values? I think we still have
2705 // to block static and fixed) only if $use_iframe
2706 // is enabled (1.5.0+)
2707 //
2708 // was: "/position\s*:\s*absolute/i",
2709 //
2710 "/position\s*:/i",
2711
1d935bc2 2712 "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
8bd0068d 2713 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2714 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2715 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
39352565 2716 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
8bd0068d 2717 ),
2718 Array(
5db90261 2719 "",
8bd0068d 2720 "idiocy",
2721 "idiocy",
2722 "idiocy",
2723 "idiocy",
567dc524 2724 "idiocy",
5b4884be 2725 "url",
8bd0068d 2726 "url(\\1#\\1)",
2727 "url(\\1#\\1)",
2728 "url(\\1#\\1)",
8bd0068d 2729 "\\1:url(\\2#\\3)"
2730 )
691a2d25 2731 )
8bd0068d 2732 )
691a2d25 2733 );
9ebace19 2734
d31f73f1 2735 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
2736 // images off by default.
afbf184c 2737 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
9ebace19 2738
691a2d25 2739 if (!$view_unsafe_images){
2740 /**
8bd0068d 2741 * Remove any references to http/https if view_unsafe_images set
2742 * to false.
2743 */
02474e43 2744 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
8bd0068d 2745 '/^([\'\"])\s*https*:.*([\'\"])/si');
02474e43 2746 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
8bd0068d 2747 "\\1$secremoveimg\\1");
02474e43 2748 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
7ef0b415 2749 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
02474e43 2750 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
8bd0068d 2751 "url(\\1$secremoveimg\\1)");
691a2d25 2752 }
451f74a2 2753
691a2d25 2754 $add_attr_to_tag = Array(
8bd0068d 2755 "/^a$/i" =>
c25f2fbb 2756 Array('target'=>'"_blank"',
02474e43 2757 'title'=>'"'._("This external link will open in a new window").'"'
8bd0068d 2758 )
2759 );
da2415c1 2760 $trusted = sq_sanitize($body,
8bd0068d 2761 $tag_list,
2762 $rm_tags_with_content,
2763 $self_closing_tags,
2764 $force_tag_closing,
2765 $rm_attnames,
2766 $bad_attvals,
2767 $add_attr_to_tag,
2768 $message,
2769 $id,
2770 $mailbox
2771 );
567dc524 2772 if (strpos($trusted,$secremoveimg)){
691a2d25 2773 $has_unsafe_images = true;
da2415c1 2774 }
c189a963 2775
2776 // we want to parse mailto's in HTML output, change to SM compose links
2777 // this is a modified version of code from url_parser.php... but Marc is
2778 // right: we need a better filtering implementation; adding this randomly
2779 // here is not a great solution
2780 //
2781 if ($take_mailto_links) {
2782 // parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
2783 global $MailTo_PReg_Match;
7196da62 2784 // some mailers (Microsoft, surprise surprise) produce mailto strings without being
2785 // inside an anchor (link) tag, so we have to make sure the regex looks for the
2786 // quote before mailto, and we'll also try to convert the non-links back into links
2787 $MailTo_PReg_Match = '/([\'"])?mailto:' . substr($MailTo_PReg_Match, 1) ;
c189a963 2788 if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2789 foreach ($regs[0] as $i => $mailto_before) {
7196da62 2790 $mailto_params = $regs[11][$i];
2791
2792 // get rid of any leading quote we may have captured but don't care about
2793 //
2794 $mailto_before = ltrim($mailto_before, '"\'');
2795
c189a963 2796 // get rid of any tailing quote since we have to add send_to to the end
2797 //
7196da62 2798 $mailto_before = rtrim($mailto_before, '"\'');
2799 $mailto_params = rtrim($mailto_params, '"\'');
c189a963 2800
7196da62 2801 if ($regs[2][$i]) { //if there is an email addr before '?', we need to merge it with the params
2802 $to = 'to=' . $regs[2][$i];
c189a963 2803 if (strpos($mailto_params, 'to=') > -1) //already a 'to='
2804 $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2805 else {
2806 if ($mailto_params) //already some params, append to them
2807 $mailto_params .= '&amp;' . $to;
2808 else
2809 $mailto_params .= '?' . $to;
2810 }
2811 }
2812
2813 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2814
2815 // we'll already have target=_blank, no need to allow comp_in_new
2816 // here (which would be a lot more work anyway)
2817 //
2818 global $compose_new_win;
2819 $temp_comp_in_new = $compose_new_win;
2820 $compose_new_win = 0;
2821 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2822 $compose_new_win = $temp_comp_in_new;
2823
2824 // remove <a href=" and anything after the next quote (we only
2825 // need the uri, not the link HTML) in compose uri
2826 //
7196da62 2827 // but only do this if the original mailto was in a real anchor tag
2828 //
2829 if (!empty($regs[1][$i])) {
2830 $comp_uri = substr($comp_uri, 9);
2831 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2832 }
c189a963 2833 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2834 }
2835 }
2836 }
2837
691a2d25 2838 return $trusted;
451f74a2 2839}
a4a70693 2840
da2415c1 2841/**
8bd0068d 2842 * function SendDownloadHeaders - send file to the browser
2843 *
2844 * Original Source: SM core src/download.php
2845 * moved here to make it available to other code, and separate
2846 * front end from back end functionality.
2847 *
2848 * @param string $type0 first half of mime type
2849 * @param string $type1 second half of mime type
2850 * @param string $filename filename to tell the browser for downloaded file
2851 * @param boolean $force whether to force the download dialog to pop
2852 * @param optional integer $filesize send the Content-Header and length to the browser
2853 * @return void
2854 */
02474e43 2855function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2856 global $languages, $squirrelmail_language;
cfffd60b 2857 $isIE = $isIE6plus = false;
02474e43 2858
2859 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2860
2861 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
8bd0068d 2862 strstr($HTTP_USER_AGENT, 'Opera') === false) {
cfffd60b 2863 $isIE = true;
02474e43 2864 }
2865
cfffd60b 2866 if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2867 ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2868 $isIE6plus = true;
02474e43 2869 }
2870
2871 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 2872 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
02474e43 2873 $filename =
8bd0068d 2874 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
02474e43 2875 } else {
1a4bc4a6 2876 $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&nbsp;', ' ', $filename));
02474e43 2877 }
2878
2879 // A Pox on Microsoft and it's Internet Explorer!
2880 //
2881 // IE has lots of bugs with file downloads.
2882 // It also has problems with SSL. Both of these cause problems
2883 // for us in this function.
2884 //
2885 // See this article on Cache Control headers and SSL
2886 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2887 //
2888 // The best thing you can do for IE is to upgrade to the latest
2889 // version
2890 //set all the Cache Control Headers for IE
2891 if ($isIE) {
2892 $filename=rawurlencode($filename);
2893 header ("Pragma: public");
8bd0068d 2894 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
c2503a4e 2895 // does nothing - see: https://blogs.msdn.microsoft.com/ieinternals/2009/07/20/internet-explorers-cache-control-extensions/
2896 // header ("Cache-Control: post-check=0, pre-check=0", false);
8bd0068d 2897 header ("Cache-Control: private");
02474e43 2898
2899 //set the inline header for IE, we'll add the attachment header later if we need it
2900 header ("Content-Disposition: inline; filename=$filename");
2901 }
2902
2903 if (!$force) {
2904 // Try to show in browser window
2905 header ("Content-Disposition: inline; filename=\"$filename\"");
2906 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2907 } else {
2908 // Try to pop up the "save as" box
2909
2910 // IE makes this hard. It pops up 2 save boxes, or none.
2911 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2912 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2913 // But, according to Microsoft, it is "RFC compliant but doesn't
2914 // take into account some deviations that allowed within the
2915 // specification." Doesn't that mean RFC non-compliant?
2916 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2917
2918 // all browsers need the application/octet-stream header for this
2919 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2920
2921 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2922 // Do not have quotes around filename, but that applied to
2923 // "attachment"... does it apply to inline too?
2924 header ("Content-Disposition: attachment; filename=\"$filename\"");
2925
cfffd60b 2926 if ($isIE && !$isIE6plus) {
02474e43 2927 // This combination seems to work mostly. IE 5.5 SP 1 has
2928 // known issues (see the Microsoft Knowledge Base)
2929
2930 // This works for most types, but doesn't work with Word files
2931 header ("Content-Type: application/download; name=\"$filename\"");
7e2ff844 2932 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2933 // These are spares, just in case. :-)
2934 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2935 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2936 //header("Content-Type: application/octet-stream; name=\"$filename\"");
7e2ff844 2937 } else if ($isIE) {
2938 // This is to prevent IE for MIME sniffing and auto open a file in IE
2939 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2940 } else {
2941 // another application/octet-stream forces download for Netscape
2942 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2943 }
2944 }
2945
2946 //send the content-length header if the calling function provides it
2947 if ($filesize > 0) {
2948 header("Content-Length: $filesize");
2949 }
07c49f57 2950
8d863f64 2951} // end fn SendDownloadHeaders