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Allow more liberal reuse of tokens to avoid cross-frame conflicts
[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 *
c0d96801 9 * @copyright 1999-2012 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) {
517 global $where, $what, $startMessage, $color, $passed_ent_id, $base_uri;
451f74a2 518
23bcec6f 519 $att_ar = $message->getAttachments($exclude_id);
23bcec6f 520 $urlMailbox = urlencode($mailbox);
521
d67f519a 522 $attachments = array();
23bcec6f 523 foreach ($att_ar as $att) {
fdc9d9b5 524 $ent = $att->entity_id;
2e25760a 525 $header = $att->header;
f0c4dc12 526 $type0 = strtolower($header->type0);
527 $type1 = strtolower($header->type1);
2e25760a 528 $name = '';
d0187bd6 529 $links = array();
21dab2dc 530 $links['download link']['text'] = _("Download");
202bcbcc 531 $links['download link']['href'] = $base_uri .
8bd0068d 532 "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
2b665f28 533
2e25760a 534 if ($type0 =='message' && $type1 == 'rfc822') {
202bcbcc 535 $default_page = $base_uri . 'src/read_body.php';
2e25760a 536 $rfc822_header = $att->rfc822_header;
098ea084 537 $filename = $rfc822_header->subject;
6cc08d8b 538 if (trim( $filename ) == '') {
539 $filename = 'untitled-[' . $ent . ']' ;
08b7f7cc 540 }
2e25760a 541 $from_o = $rfc822_header->from;
542 if (is_object($from_o)) {
04ea844e 543 $from_name = decodeHeader($from_o->getAddress(false));
7e697748 544 } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
545 // something weird happens when a digest message is opened and you return to the digest
546 // now the from object is part of an array. Probably the parseHeader call overwrites the info
547 // retrieved from the bodystructure in a different way. We need to fix this later.
548 // possible starting point, do not fetch header we already have and inspect how
549 // the rfc822_header object behaves.
550 $from_name = decodeHeader($from_o[0]->getAddress(false));
2e25760a 551 } else {
552 $from_name = _("Unknown sender");
f0c4dc12 553 }
d0187bd6 554 $description = _("From").': '.$from_name;
23bcec6f 555 } else {
202bcbcc 556 $default_page = $base_uri . 'src/download.php';
02474e43 557 $filename = $att->getFilename();
f810c0b2 558 if ($header->description) {
098ea084 559 $description = decodeHeader($header->description);
f810c0b2 560 } else {
3d8371be 561 $description = '';
562 }
2e25760a 563 }
564
565 $display_filename = $filename;
3d8371be 566 if (isset($passed_ent_id)) {
567 $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
568 } else {
569 $passed_ent_id_link = '';
570 }
571 $defaultlink = $default_page . "?startMessage=$startMessage"
8bd0068d 572 . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
573 . '&amp;ent_id='.$ent.$passed_ent_id_link;
2e25760a 574 if ($where && $what) {
8bd0068d 575 $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
2e25760a 576 }
7e2ff844 577 // IE does make use of mime content sniffing. Forcing a download
578 // prohibit execution of XSS inside an application/octet-stream attachment
579 if ($type0 == 'application' && $type1 == 'octet-stream') {
580 $defaultlink .= '&amp;absolute_dl=true';
581 }
2b665f28 582
3d8371be 583 /* This executes the attachment hook with a specific MIME-type.
53901c7b 584 * It also allows plugins to run if there's a rule for a more
585 * generic type. Finally, a hook for ALL attachment types is
586 * run as well.
8bd0068d 587 */
8dca4d22 588 // First remember the default link.
589 $defaultlink_orig = $defaultlink;
590
d849b570 591 /* The API for this hook has changed as of 1.5.2 so that all plugin
592 arguments are passed in an array instead of each their own plugin
593 argument, and arguments are passed by reference, so instead of
594 returning any changes, changes should simply be made to the original
595 arguments themselves. */
53901c7b 596 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
9c3b2d22 597 &$defaultlink, &$display_filename, &$where, &$what);
598 do_hook("attachment $type0/$type1", $temp);
53901c7b 599 /* The API for this hook has changed as of 1.5.2 so that all plugin
600 arguments are passed in an array instead of each their own plugin
601 argument, and arguments are passed by reference, so instead of
602 returning any changes, changes should simply be made to the original
603 arguments themselves. */
604 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
605 &$defaultlink, &$display_filename, &$where, &$what);
606 // Do not let a generic plugin change the default link if a more
607 // specialized one already did it...
608 if ($defaultlink != $defaultlink_orig) {
609 $dummy = '';
610 $temp[5] = &$dummy;
2e25760a 611 }
53901c7b 612 do_hook("attachment $type0/*", $temp);
d849b570 613 /* The API for this hook has changed as of 1.5.2 so that all plugin
614 arguments are passed in an array instead of each their own plugin
615 argument, and arguments are passed by reference, so instead of
616 returning any changes, changes should simply be made to the original
617 arguments themselves. */
9c3b2d22 618 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
619 &$defaultlink, &$display_filename, &$where, &$what);
8dca4d22 620 // Do not let a generic plugin change the default link if a more
621 // specialized one already did it...
622 if ($defaultlink != $defaultlink_orig) {
623 $dummy = '';
624 $temp[5] = &$dummy;
625 }
9c3b2d22 626 do_hook("attachment */*", $temp);
77b88425 627
d67f519a 628 $this_attachment = array();
629 $this_attachment['Name'] = decodeHeader($display_filename);
630 $this_attachment['Description'] = $description;
631 $this_attachment['DefaultHREF'] = $defaultlink;
632 $this_attachment['DownloadHREF'] = $links['download link']['href'];
633 $this_attachment['ViewHREF'] = isset($links['attachment_common']) ? $links['attachment_common']['href'] : '';
634 $this_attachment['Size'] = $header->size;
3047e291 635 $this_attachment['ContentType'] = sm_encode_html_special_chars($type0 .'/'. $type1);
d67f519a 636 $this_attachment['OtherLinks'] = array();
3d8371be 637 foreach ($links as $val) {
d0187bd6 638 if ($val['text']==_("Download") || $val['text'] == _("View"))
639 continue;
640 if (empty($val['text']) && empty($val['extra']))
641 continue;
2b665f28 642
d67f519a 643 $temp = array();
644 $temp['HREF'] = $val['href'];
645 $temp['Text'] = (empty($val['text']) ? '' : $val['text']) . (empty($val['extra']) ? '' : $val['extra']);
646 $this_attachment['OtherLinks'][] = $temp;
2e25760a 647 }
d67f519a 648 $attachments[] = $this_attachment;
2b665f28 649
3d8371be 650 unset($links);
2e25760a 651 }
2b665f28 652
d67f519a 653 return $attachments;
654}
655
656/**
657 * Displays attachment links and information
658 *
659 * Since 1.3.0 function is not included in formatBody() call.
660 *
661 * Since 1.0.2 uses attachment $type0/$type1 hook.
662 * Since 1.2.5 uses attachment $type0/* hook.
663 * Since 1.5.0 uses attachments_bottom hook.
664 * Since 1.5.2 uses templates and does *not* return a value.
665 *
666 * @param object $message SquirrelMail message object
667 * @param array $exclude_id message parts that are not attachments.
668 * @param string $mailbox mailbox name
669 * @param integer $id message id
670 */
671function formatAttachments($message, $exclude_id, $mailbox, $id) {
672 global $oTemplate;
2b665f28 673
d67f519a 674 $attach = buildAttachmentArray($message, $exclude_id, $mailbox, $id);
d0187bd6 675
676 $oTemplate->assign('attachments', $attach);
677 $oTemplate->display('read_attachments.tpl');
451f74a2 678}
b74ba498 679
7c7b74b3 680function sqimap_base64_decode(&$string) {
7c0ec1d8 681
b17a8968 682 // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
7c0ec1d8 683 // fly decoding (to reduce memory usage) you have to check if the
684 // data has incomplete pairs
685
b17a8968 686 // Remove the noise in order to check if the 4 bytes pairs are complete
7c0ec1d8 687 $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
688
42ce44f8 689 $sStringRem = '';
7c0ec1d8 690 $iMod = strlen($string) % 4;
691 if ($iMod) {
692 $sStringRem = substr($string,-$iMod);
b17a8968 693 // Check if $sStringRem contains padding characters
7c0ec1d8 694 if (substr($sStringRem,-1) != '=') {
695 $string = substr($string,0,-$iMod);
696 } else {
697 $sStringRem = '';
698 }
699 }
7c7b74b3 700 $string = base64_decode($string);
7c0ec1d8 701 return $sStringRem;
7c7b74b3 702}
703
fdf7cef1 704/**
fa26ab45 705 * Decodes encoded string (usually message body)
706 *
707 * This function decodes a string (usually the message body)
708 * depending on the encoding type. Currently quoted-printable
709 * and base64 encodings are supported.
710 *
711 * The decode_body hook was added to this function in 1.4.2/1.5.0.
712 * The $force_crlf parameter was added in 1.5.2.
713 *
714 * @param string $string The encoded string
715 * @param string $encoding used encoding
716 * @param string $force_crlf Whether or not to force CRLF or LF
717 * line endings (or to leave as is).
718 * If given as "LF", line endings will
719 * all be converted to LF; if "CRLF",
720 * line endings will all be converted
721 * to CRLF. If given as an empty value,
9785376e 722 * the global $force_crlf_default will
fa26ab45 723 * be consulted (it can be specified in
724 * config/config_local.php). Otherwise,
725 * any other value will cause the string
726 * to be left alone. Note that this will
727 * be overridden to "LF" if not using at
728 * least PHP version 4.3.0. (OPTIONAL;
729 * default is empty - consult global
730 * default value)
731 *
732 * @return string The decoded string
fdf7cef1 733 *
fdf7cef1 734 * @since 1.0
fa26ab45 735 *
fdf7cef1 736 */
fa26ab45 737function decodeBody($string, $encoding, $force_crlf='') {
738
739 global $force_crlf_default;
740 if (empty($force_crlf)) $force_crlf = $force_crlf_default;
741 $force_crlf = strtoupper($force_crlf);
742
743 // must force line endings to LF due to broken
744 // quoted_printable_decode() in PHP versions
745 // before 4.3.0 (see below)
746 //
747 if (!check_php_version(4, 3, 0) || $force_crlf == 'LF')
748 $string = str_replace("\r\n", "\n", $string);
749 else if ($force_crlf == 'CRLF')
750 $string = str_replace("\n", "\r\n", $string);
83be314a 751
b583c3e8 752 $encoding = strtolower($encoding);
3d8371be 753
d849b570 754 $encoding_handler = do_hook('decode_body', $encoding);
5166f86a 755
756
fa26ab45 757 // plugins get first shot at decoding the string
5166f86a 758 //
759 if (!empty($encoding_handler) && function_exists($encoding_handler)) {
fa26ab45 760 $string = $encoding_handler('decode', $string);
5166f86a 761
fdf7cef1 762 } elseif ($encoding == 'quoted-printable' ||
8bd0068d 763 $encoding == 'quoted_printable') {
fa26ab45 764
765 // quoted_printable_decode() function is broken in older
766 // php versions. Text with \r\n decoding was fixed only
767 // in php 4.3.0. Minimal code requirement is PHP 4.0.4+
768 // and the above call to: str_replace("\r\n", "\n", $string);
769 //
770 $string = quoted_printable_decode($string);
771
fdf7cef1 772 } elseif ($encoding == 'base64') {
fa26ab45 773 $string = base64_decode($string);
b583c3e8 774 }
3d8371be 775
b583c3e8 776 // All other encodings are returned raw.
fa26ab45 777 return $string;
451f74a2 778}
779
9f7f68c3 780/**
8bd0068d 781 * Decodes headers
782 *
e1115979 783 * This function decodes strings that are encoded according to
8bd0068d 784 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
785 * Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
786 *
787 * @param string $string header string that has to be made readable
788 * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
bcae324b 789 * @param boolean $htmlsafe preserve spaces and sanitize html special characters. defaults to true
8bd0068d 790 * @param boolean $decide decide if string can be utfencoded. defaults to false
791 * @return string decoded header string
792 */
bcae324b 793function decodeHeader ($string, $utfencode=true,$htmlsafe=true,$decide=false) {
d6f584fc 794 global $languages, $squirrelmail_language,$default_charset;
79e07c7e 795 if (is_array($string)) {
796 $string = implode("\n", $string);
797 }
da2415c1 798
10dec454 799 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 800 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
33a55f5a 801 $string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
08b7f7cc 802 // Do we need to return at this point?
803 // return $string;
83be314a 804 }
79e07c7e 805 $i = 0;
08b7f7cc 806 $iLastMatch = -2;
db65b6b0 807 $encoded = true;
0a06275a 808
098ea084 809 $aString = explode(' ',$string);
08b7f7cc 810 $ret = '';
098ea084 811 foreach ($aString as $chunk) {
358a78a1 812 if ($encoded && $chunk === '') {
08b7f7cc 813 continue;
358a78a1 814 } elseif ($chunk === '') {
08b7f7cc 815 $ret .= ' ';
816 continue;
817 }
098ea084 818 $encoded = false;
08b7f7cc 819 /* if encoded words are not separated by a linear-space-white we still catch them */
820 $j = $i-1;
7e6ca3e8 821
08b7f7cc 822 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
823 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
824 if ($iLastMatch !== $j) {
bcae324b 825 if ($htmlsafe) {
9f7f68c3 826 $ret .= '&#32;';
08b7f7cc 827 } else {
828 $ret .= ' ';
829 }
830 }
831 $iLastMatch = $i;
832 $j = $i;
bcae324b 833 if ($htmlsafe) {
3047e291 834 $ret .= sm_encode_html_special_chars($res[1]);
cb718de0 835 } else {
836 $ret .= $res[1];
837 }
098ea084 838 $encoding = ucfirst($res[3]);
d6f584fc 839
840 /* decide about valid decoding */
841 if ($decide && is_conversion_safe($res[2])) {
8bd0068d 842 $utfencode=true;
843 $can_be_encoded=true;
d6f584fc 844 } else {
8bd0068d 845 $can_be_encoded=false;
d6f584fc 846 }
098ea084 847 switch ($encoding)
848 {
8bd0068d 849 case 'B':
850 $replace = base64_decode($res[4]);
851 if ($utfencode) {
852 if ($can_be_encoded) {
853 /* convert string to different charset,
854 * if functions asks for it (usually in compose)
855 */
bcae324b 856 $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
8bd0068d 857 } else {
858 // convert string to html codes in order to display it
859 $ret .= charset_decode($res[2],$replace);
860 }
fab65ca9 861 } else {
bcae324b 862 if ($htmlsafe) {
3047e291 863 $replace = sm_encode_html_special_chars($replace);
8bd0068d 864 }
865 $ret.= $replace;
fab65ca9 866 }
8bd0068d 867 break;
868 case 'Q':
869 $replace = str_replace('_', ' ', $res[4]);
6c4e2e9b 870 $replace = preg_replace_callback('/=([0-9a-f]{2})/i',
871 create_function ('$matches', 'return chr(hexdec($matches[1]));'),
8bd0068d 872 $replace);
873 if ($utfencode) {
874 if ($can_be_encoded) {
875 /* convert string to different charset,
876 * if functions asks for it (usually in compose)
877 */
bcae324b 878 $replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
8bd0068d 879 } else {
880 // convert string to html codes in order to display it
881 $replace = charset_decode($res[2], $replace);
882 }
883 } else {
bcae324b 884 if ($htmlsafe) {
3047e291 885 $replace = sm_encode_html_special_chars($replace);
8bd0068d 886 }
098ea084 887 }
8bd0068d 888 $ret .= $replace;
889 break;
890 default:
891 break;
79e07c7e 892 }
098ea084 893 $chunk = $res[5];
894 $encoded = true;
08b7f7cc 895 }
896 if (!$encoded) {
bcae324b 897 if ($htmlsafe) {
9f7f68c3 898 $ret .= '&#32;';
08b7f7cc 899 } else {
900 $ret .= ' ';
da2415c1 901 }
08b7f7cc 902 }
dc3d13a7 903
bcae324b 904 if (!$encoded && $htmlsafe) {
3047e291 905 $ret .= sm_encode_html_special_chars($chunk);
dc3d13a7 906 } else {
907 $ret .= $chunk;
908 }
098ea084 909 ++$i;
910 }
fd81e884 911 /* remove the first added space */
912 if ($ret) {
bcae324b 913 if ($htmlsafe) {
9f7f68c3 914 $ret = substr($ret,5);
fd81e884 915 } else {
916 $ret = substr($ret,1);
917 }
918 }
da2415c1 919
08b7f7cc 920 return $ret;
451f74a2 921}
922
9f7f68c3 923/**
a24cf710 924 * Encodes header
8bd0068d 925 *
a24cf710 926 * Function uses XTRA_CODE _encodeheader function, if such function exists.
a24cf710 927 *
758a7889 928 * Function uses Q encoding by default and encodes a string according to RFC
929 * 1522 for use in headers if it contains 8-bit characters or anything that
a24cf710 930 * looks like it should be encoded.
8bd0068d 931 *
758a7889 932 * Function switches to B encoding and encodeHeaderBase64() function, if
933 * string is 8bit and multibyte character set supported by mbstring extension
934 * is used. It can cause E_USER_NOTICE errors, if interface is used with
f270a6eb 935 * multibyte character set unsupported by mbstring extension.
936 *
8bd0068d 937 * @param string $string header string, that has to be encoded
938 * @return string quoted-printable encoded string
f270a6eb 939 * @todo make $mb_charsets system wide constant
8bd0068d 940 */
451f74a2 941function encodeHeader ($string) {
6fbd125b 942 global $default_charset, $languages, $squirrelmail_language;
83be314a 943
10dec454 944 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 945 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
33a55f5a 946 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
83be314a 947 }
793cc001 948
a24cf710 949 // Use B encoding for multibyte charsets
f270a6eb 950 $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
951 if (in_array($default_charset,$mb_charsets) &&
952 in_array($default_charset,sq_mb_list_encodings()) &&
953 sq_is8bit($string)) {
954 return encodeHeaderBase64($string,$default_charset);
955 } elseif (in_array($default_charset,$mb_charsets) &&
956 sq_is8bit($string) &&
957 ! in_array($default_charset,sq_mb_list_encodings())) {
958 // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
959 // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
960 }
a24cf710 961
451f74a2 962 // Encode only if the string contains 8-bit characters or =?
3d8371be 963 $j = strlen($string);
098ea084 964 $max_l = 75 - strlen($default_charset) - 7;
965 $aRet = array();
451f74a2 966 $ret = '';
c96c32f4 967 $iEncStart = $enc_init = false;
0d53f0f9 968 $cur_l = $iOffset = 0;
3d8371be 969 for($i = 0; $i < $j; ++$i) {
c96c32f4 970 switch($string{$i})
971 {
6b76cffa 972 case '"':
8bd0068d 973 case '=':
974 case '<':
975 case '>':
976 case ',':
977 case '?':
978 case '_':
979 if ($iEncStart === false) {
980 $iEncStart = $i;
981 }
982 $cur_l+=3;
983 if ($cur_l > ($max_l-2)) {
984 /* if there is an stringpart that doesn't need encoding, add it */
08b7f7cc 985 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 986 $aRet[] = "=?$default_charset?Q?$ret?=";
987 $iOffset = $i;
988 $cur_l = 0;
989 $ret = '';
990 $iEncStart = false;
08b7f7cc 991 } else {
8bd0068d 992 $ret .= sprintf("=%02X",ord($string{$i}));
c96c32f4 993 }
8bd0068d 994 break;
995 case '(':
996 case ')':
997 if ($iEncStart !== false) {
08b7f7cc 998 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
8bd0068d 999 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 1000 $iOffset = $i;
8bd0068d 1001 $cur_l = 0;
1002 $ret = '';
1003 $iEncStart = false;
c96c32f4 1004 }
8bd0068d 1005 break;
1006 case ' ':
c96c32f4 1007 if ($iEncStart !== false) {
098ea084 1008 $cur_l++;
1009 if ($cur_l > $max_l) {
08b7f7cc 1010 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 1011 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 1012 $iOffset = $i;
1013 $cur_l = 0;
098ea084 1014 $ret = '';
8bd0068d 1015 $iEncStart = false;
08b7f7cc 1016 } else {
8bd0068d 1017 $ret .= '_';
c96c32f4 1018 }
3d8371be 1019 }
8bd0068d 1020 break;
1021 default:
1022 $k = ord($string{$i});
1023 if ($k > 126) {
1024 if ($iEncStart === false) {
1025 // do not start encoding in the middle of a string, also take the rest of the word.
1026 $sLeadString = substr($string,0,$i);
1027 $aLeadString = explode(' ',$sLeadString);
1028 $sToBeEncoded = array_pop($aLeadString);
1029 $iEncStart = $i - strlen($sToBeEncoded);
1030 $ret .= $sToBeEncoded;
1031 $cur_l += strlen($sToBeEncoded);
1032 }
1033 $cur_l += 3;
1034 /* first we add the encoded string that reached it's max size */
1035 if ($cur_l > ($max_l-2)) {
1036 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1037 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
1038 $cur_l = 3;
1039 $ret = '';
1040 $iOffset = $i;
1041 $iEncStart = $i;
1042 }
1043 $enc_init = true;
1044 $ret .= sprintf("=%02X", $k);
1045 } else {
1046 if ($iEncStart !== false) {
1047 $cur_l++;
1048 if ($cur_l > $max_l) {
1049 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1050 $aRet[] = "=?$default_charset?Q?$ret?=";
1051 $iEncStart = false;
1052 $iOffset = $i;
1053 $cur_l = 0;
1054 $ret = '';
1055 } else {
1056 $ret .= $string{$i};
1057 }
1058 }
1059 }
1060 break;
f7b3ba37 1061 }
451f74a2 1062 }
793cc001 1063
c96c32f4 1064 if ($enc_init) {
1065 if ($iEncStart !== false) {
1066 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1067 $aRet[] = "=?$default_charset?Q?$ret?=";
1068 } else {
1069 $aRet[] = substr($string,$iOffset);
1070 }
1071 $string = implode('',$aRet);
451f74a2 1072 }
3d8371be 1073 return $string;
451f74a2 1074}
b74ba498 1075
f270a6eb 1076/**
1077 * Encodes string according to rfc2047 B encoding header formating rules
1078 *
758a7889 1079 * It is recommended way to encode headers with character sets that store
f270a6eb 1080 * symbols in more than one byte.
1081 *
1082 * Function requires mbstring support. If required mbstring functions are missing,
1083 * function returns false and sets E_USER_WARNING level error message.
1084 *
758a7889 1085 * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1086 * that mbstring functions will generate E_WARNING errors, if unsupported
f270a6eb 1087 * character set is used. mb_encode_mimeheader function provided by php
1088 * mbstring extension is not used in order to get better control of header
1089 * encoding.
1090 *
758a7889 1091 * Used php code functions - function_exists(), trigger_error(), strlen()
1092 * (is used with charset names and base64 strings). Used php mbstring
f270a6eb 1093 * functions - mb_strlen and mb_substr.
1094 *
758a7889 1095 * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
f270a6eb 1096 * encoding), rfc 2822 (header folding)
1097 *
1098 * @param string $string header string that must be encoded
758a7889 1099 * @param string $charset character set. Must be supported by mbstring extension.
f270a6eb 1100 * Use sq_mb_list_encodings() to detect supported charsets.
1101 * @return string string encoded according to rfc2047 B encoding formating rules
1102 * @since 1.5.1
1103 * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1104 * @todo Do we want to control max length of header?
1105 * @todo Do we want to control EOL (end-of-line) marker?
1106 * @todo Do we want to translate error message?
1107 */
1108function encodeHeaderBase64($string,$charset) {
1109 /**
1110 * Check mbstring function requirements.
1111 */
1112 if (! function_exists('mb_strlen') ||
1113 ! function_exists('mb_substr')) {
1114 // set E_USER_WARNING
1115 trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1116 // return false
1117 return false;
1118 }
1119
1120 // initial return array
1121 $aRet = array();
1122
1123 /**
1124 * header length = 75 symbols max (same as in encodeHeader)
1125 * remove $charset length
1126 * remove =? ? ?= (5 chars)
1127 * remove 2 more chars (\r\n ?)
1128 */
1129 $iMaxLength = 75 - strlen($charset) - 7;
1130
1131 // set first character position
1132 $iStartCharNum = 0;
1133
1134 // loop through all characters. count characters and not bytes.
1135 for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1136 // encode string from starting character to current character.
1137 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1138
1139 // Check encoded string length
1140 if(strlen($encoded_string)>$iMaxLength) {
1141 // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1142 $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1143
1144 // set new starting character
1145 $iStartCharNum = $iCharNum-1;
1146
1147 // encode last char (in case it is last character in string)
1148 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1149 } // if string is shorter than max length - add next character
1150 }
1151
1152 // add last encoded string to array
1153 $aRet[] = $encoded_string;
1154
1155 // set initial return string
1156 $sRet = '';
1157
1158 // loop through encoded strings
1159 foreach($aRet as $string) {
1160 // TODO: Do we want to control EOL (end-of-line) marker
1161 if ($sRet!='') $sRet.= " ";
1162
1163 // add header tags and encoded string to return string
1164 $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1165 }
1166
1167 return $sRet;
1168}
1169
691a2d25 1170/* This function trys to locate the entity_id of a specific mime element */
3d8371be 1171function find_ent_id($id, $message) {
a171b359 1172 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1173 if ($message->entities[$i]->header->type0 == 'multipart') {
3d8371be 1174 $ret = find_ent_id($id, $message->entities[$i]);
451f74a2 1175 } else {
3d8371be 1176 if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
d8cffbab 1177// if (sq_check_save_extension($message->entities[$i])) {
8bd0068d 1178 return $message->entities[$i]->entity_id;
da2415c1 1179// }
c8f5f606 1180 } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1181 /**
1182 * This is part of a fix for Outlook Express 6.x generating
1183 * cid URLs without creating content-id headers
1184 * @@JA - 20050207
1185 */
1186 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1187 return $message->entities[$i]->entity_id;
1188 }
3d8371be 1189 }
a3daaaf3 1190 }
451f74a2 1191 }
3d8371be 1192 return $ret;
451f74a2 1193}
a3daaaf3 1194
e5e9381a 1195function sq_check_save_extension($message) {
1196 $filename = $message->getFilename();
1197 $ext = substr($filename, strrpos($filename,'.')+1);
1198 $save_extensions = array('jpg','jpeg','gif','png','bmp');
3d8371be 1199 return in_array($ext, $save_extensions);
e5e9381a 1200}
1201
1202
691a2d25 1203/**
8bd0068d 1204 ** HTMLFILTER ROUTINES
1205 */
451f74a2 1206
2dd879b8 1207/**
0493ed11 1208 * This function checks attribute values for entity-encoded values
1209 * and returns them translated into 8-bit strings so we can run
1210 * checks on them.
8bd0068d 1211 *
0493ed11 1212 * @param $attvalue A string to run entity check against.
1213 * @return Nothing, modifies a reference value.
8bd0068d 1214 */
0493ed11 1215function sq_defang(&$attvalue){
1216 $me = 'sq_defang';
2dd879b8 1217 /**
0493ed11 1218 * Skip this if there aren't ampersands or backslashes.
8bd0068d 1219 */
0493ed11 1220 if (strpos($attvalue, '&') === false
1221 && strpos($attvalue, '\\') === false){
1222 return;
2dd879b8 1223 }
0493ed11 1224 $m = false;
2b665f28 1225 // before deent, translate the dangerous unicode characters and ... to safe values
1226 // otherwise the regular expressions do not match.
1227
1228
1229
0493ed11 1230 do {
1231 $m = false;
1232 $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1233 $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1234 $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1235 } while ($m == true);
1236 $attvalue = stripslashes($attvalue);
2dd879b8 1237}
1238
1239/**
8bd0068d 1240 * Kill any tabs, newlines, or carriage returns. Our friends the
1241 * makers of the browser with 95% market value decided that it'd
1242 * be funny to make "java[tab]script" be just as good as "javascript".
1243 *
1244 * @param attvalue The attribute value before extraneous spaces removed.
0493ed11 1245 * @return attvalue Nothing, modifies a reference value.
8bd0068d 1246 */
0493ed11 1247function sq_unspace(&$attvalue){
1248 $me = 'sq_unspace';
1249 if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1250 $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1251 Array('', '', '', '', ''), $attvalue);
2dd879b8 1252 }
2dd879b8 1253}
1254
2b665f28 1255/**
88de4926 1256 * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
2b665f28 1257 * IE as regular characters.
1258 *
1259 * @param attvalue The attribute value before dangerous characters are translated.
1260 * @return attvalue Nothing, modifies a reference value.
1261 * @author Marc Groot Koerkamp.
1262 */
1263function sq_fixIE_idiocy(&$attvalue) {
1264 // remove NUL
1265 $attvalue = str_replace("\0", "", $attvalue);
1266 // remove comments
1267 $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1268
88de4926 1269 // IE has the evil habit of accepting every possible value for the attribute expression.
1270 // The table below contains characters which are parsed by IE if they are used in the "expression"
2b665f28 1271 // attribute value.
1272 $aDangerousCharsReplacementTable = array(
1273 array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1274 '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1275 '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
567dc524 1276 '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1277 '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
2b665f28 1278 '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1279 '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1280 '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1281 '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1282 '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1283 '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1284 '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1285 '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1286 '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1287 '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1288 '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1289 '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1290 '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1291 '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1292 '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1293 '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1294 '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1295 '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1296 '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
567dc524 1297 "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range
1298 "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1299 "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1300 "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1301 "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1302 "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1303 "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1304 "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1305 "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1306 "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1307 "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1308 "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1309 "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1310 "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1311 "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1312 "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1313 "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1314 "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1315 "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1316 "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1317 "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1318 "\xCA\x9F", /* L UNICODE IPA Extension */
1319 "\xCA\x80", /* R UNICODE IPA Extension */
1320 "\xC9\xB4"), /* N UNICODE IPA Extension */
2b665f28 1321 array('l', 'l', 'r','r','n','n',
567dc524 1322 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1323 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1324 'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
2b665f28 1325 $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1326
88de4926 1327 // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1328 // used for XSS.
2b665f28 1329 $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1330}
1331
691a2d25 1332/**
8bd0068d 1333 * This function returns the final tag out of the tag name, an array
1334 * of attributes, and the type of the tag. This function is called by
1335 * sq_sanitize internally.
1336 *
1337 * @param $tagname the name of the tag.
1338 * @param $attary the array of attributes and their values
1339 * @param $tagtype The type of the tag (see in comments).
1340 * @return a string with the final tag representation.
1341 */
691a2d25 1342function sq_tagprint($tagname, $attary, $tagtype){
b583c3e8 1343 $me = 'sq_tagprint';
3d8371be 1344
691a2d25 1345 if ($tagtype == 2){
1346 $fulltag = '</' . $tagname . '>';
1347 } else {
1348 $fulltag = '<' . $tagname;
1349 if (is_array($attary) && sizeof($attary)){
1350 $atts = Array();
1351 while (list($attname, $attvalue) = each($attary)){
1352 array_push($atts, "$attname=$attvalue");
1353 }
1354 $fulltag .= ' ' . join(" ", $atts);
1355 }
1356 if ($tagtype == 3){
b583c3e8 1357 $fulltag .= ' /';
691a2d25 1358 }
b583c3e8 1359 $fulltag .= '>';
451f74a2 1360 }
691a2d25 1361 return $fulltag;
451f74a2 1362}
a3daaaf3 1363
691a2d25 1364/**
8bd0068d 1365 * A small helper function to use with array_walk. Modifies a by-ref
1366 * value and makes it lowercase.
1367 *
1368 * @param $val a value passed by-ref.
1369 * @return void since it modifies a by-ref value.
1370 */
691a2d25 1371function sq_casenormalize(&$val){
1372 $val = strtolower($val);
1373}
451f74a2 1374
691a2d25 1375/**
8bd0068d 1376 * This function skips any whitespace from the current position within
1377 * a string and to the next non-whitespace value.
1378 *
1379 * @param $body the string
1380 * @param $offset the offset within the string where we should start
1381 * looking for the next non-whitespace character.
1382 * @return the location within the $body where the next
1383 * non-whitespace char is located.
1384 */
691a2d25 1385function sq_skipspace($body, $offset){
b583c3e8 1386 $me = 'sq_skipspace';
3d8371be 1387 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
691a2d25 1388 if (sizeof($matches{1})){
1389 $count = strlen($matches{1});
1390 $offset += $count;
451f74a2 1391 }
691a2d25 1392 return $offset;
451f74a2 1393}
a3daaaf3 1394
691a2d25 1395/**
8bd0068d 1396 * This function looks for the next character within a string. It's
1397 * really just a glorified "strpos", except it catches if failures
1398 * nicely.
1399 *
1400 * @param $body The string to look for needle in.
1401 * @param $offset Start looking from this position.
1402 * @param $needle The character/string to look for.
1403 * @return location of the next occurance of the needle, or
1404 * strlen($body) if needle wasn't found.
1405 */
691a2d25 1406function sq_findnxstr($body, $offset, $needle){
3d8371be 1407 $me = 'sq_findnxstr';
691a2d25 1408 $pos = strpos($body, $needle, $offset);
1409 if ($pos === FALSE){
1410 $pos = strlen($body);
451f74a2 1411 }
691a2d25 1412 return $pos;
451f74a2 1413}
a3daaaf3 1414
691a2d25 1415/**
8bd0068d 1416 * This function takes a PCRE-style regexp and tries to match it
1417 * within the string.
1418 *
1419 * @param $body The string to look for needle in.
1420 * @param $offset Start looking from here.
1421 * @param $reg A PCRE-style regex to match.
1422 * @return Returns a false if no matches found, or an array
1423 * with the following members:
1424 * - integer with the location of the match within $body
1425 * - string with whatever content between offset and the match
1426 * - string with whatever it is we matched
1427 */
691a2d25 1428function sq_findnxreg($body, $offset, $reg){
b583c3e8 1429 $me = 'sq_findnxreg';
691a2d25 1430 $matches = Array();
1431 $retarr = Array();
7d06541f 1432 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1433 if (!isset($matches{0}) || !$matches{0}){
691a2d25 1434 $retarr = false;
1435 } else {
1436 $retarr{0} = $offset + strlen($matches{1});
1437 $retarr{1} = $matches{1};
1438 $retarr{2} = $matches{2};
1439 }
1440 return $retarr;
1441}
a3daaaf3 1442
691a2d25 1443/**
8bd0068d 1444 * This function looks for the next tag.
1445 *
1446 * @param $body String where to look for the next tag.
1447 * @param $offset Start looking from here.
1448 * @return false if no more tags exist in the body, or
1449 * an array with the following members:
1450 * - string with the name of the tag
1451 * - array with attributes and their values
1452 * - integer with tag type (1, 2, or 3)
1453 * - integer where the tag starts (starting "<")
1454 * - integer where the tag ends (ending ">")
1455 * first three members will be false, if the tag is invalid.
1456 */
691a2d25 1457function sq_getnxtag($body, $offset){
b583c3e8 1458 $me = 'sq_getnxtag';
691a2d25 1459 if ($offset > strlen($body)){
1460 return false;
1461 }
1462 $lt = sq_findnxstr($body, $offset, "<");
1463 if ($lt == strlen($body)){
1464 return false;
1465 }
1466 /**
8bd0068d 1467 * We are here:
1468 * blah blah <tag attribute="value">
1469 * \---------^
1470 */
691a2d25 1471 $pos = sq_skipspace($body, $lt+1);
1472 if ($pos >= strlen($body)){
1473 return Array(false, false, false, $lt, strlen($body));
1474 }
1475 /**
8bd0068d 1476 * There are 3 kinds of tags:
1477 * 1. Opening tag, e.g.:
1478 * <a href="blah">
1479 * 2. Closing tag, e.g.:
1480 * </a>
1481 * 3. XHTML-style content-less tag, e.g.:
1482 * <img src="blah" />
1483 */
691a2d25 1484 $tagtype = false;
1485 switch (substr($body, $pos, 1)){
3d8371be 1486 case '/':
1487 $tagtype = 2;
1488 $pos++;
1489 break;
1490 case '!':
1491 /**
8bd0068d 1492 * A comment or an SGML declaration.
1493 */
3d8371be 1494 if (substr($body, $pos+1, 2) == "--"){
1495 $gt = strpos($body, "-->", $pos);
1496 if ($gt === false){
1497 $gt = strlen($body);
1498 } else {
1499 $gt += 2;
1500 }
1501 return Array(false, false, false, $lt, $gt);
bb8d0799 1502 } else {
3d8371be 1503 $gt = sq_findnxstr($body, $pos, ">");
1504 return Array(false, false, false, $lt, $gt);
1505 }
1506 break;
1507 default:
1508 /**
8bd0068d 1509 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1510 * later.
1511 */
3d8371be 1512 $tagtype = 1;
1513 break;
691a2d25 1514 }
a3daaaf3 1515
0493ed11 1516 $tag_start = $pos;
691a2d25 1517 $tagname = '';
1518 /**
8bd0068d 1519 * Look for next [\W-_], which will indicate the end of the tag name.
1520 */
691a2d25 1521 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1522 if ($regary == false){
1523 return Array(false, false, false, $lt, strlen($body));
1524 }
1525 list($pos, $tagname, $match) = $regary;
1526 $tagname = strtolower($tagname);
1527
1528 /**
8bd0068d 1529 * $match can be either of these:
1530 * '>' indicating the end of the tag entirely.
1531 * '\s' indicating the end of the tag name.
1532 * '/' indicating that this is type-3 xhtml tag.
1533 *
1534 * Whatever else we find there indicates an invalid tag.
1535 */
691a2d25 1536 switch ($match){
3d8371be 1537 case '/':
691a2d25 1538 /**
8bd0068d 1539 * This is an xhtml-style tag with a closing / at the
1540 * end, like so: <img src="blah" />. Check if it's followed
1541 * by the closing bracket. If not, then this tag is invalid
1542 */
3d8371be 1543 if (substr($body, $pos, 2) == "/>"){
1544 $pos++;
1545 $tagtype = 3;
1546 } else {
1547 $gt = sq_findnxstr($body, $pos, ">");
1548 $retary = Array(false, false, false, $lt, $gt);
1549 return $retary;
1550 }
1551 case '>':
1552 return Array($tagname, false, $tagtype, $lt, $pos);
1553 break;
1554 default:
1555 /**
8bd0068d 1556 * Check if it's whitespace
1557 */
3d8371be 1558 if (!preg_match('/\s/', $match)){
1559 /**
8bd0068d 1560 * This is an invalid tag! Look for the next closing ">".
1561 */
7d06541f 1562 $gt = sq_findnxstr($body, $lt, ">");
3d8371be 1563 return Array(false, false, false, $lt, $gt);
1564 }
1565 break;
691a2d25 1566 }
3d8371be 1567
691a2d25 1568 /**
8bd0068d 1569 * At this point we're here:
1570 * <tagname attribute='blah'>
1571 * \-------^
1572 *
1573 * At this point we loop in order to find all attributes.
1574 */
691a2d25 1575 $attname = '';
0493ed11 1576 $atttype = false;
691a2d25 1577 $attary = Array();
1578
1579 while ($pos <= strlen($body)){
1580 $pos = sq_skipspace($body, $pos);
1581 if ($pos == strlen($body)){
1582 /**
8bd0068d 1583 * Non-closed tag.
1584 */
691a2d25 1585 return Array(false, false, false, $lt, $pos);
1586 }
1587 /**
8bd0068d 1588 * See if we arrived at a ">" or "/>", which means that we reached
1589 * the end of the tag.
1590 */
691a2d25 1591 $matches = Array();
164800ad 1592 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
c828931c 1593 /**
8bd0068d 1594 * Yep. So we did.
1595 */
c828931c 1596 $pos += strlen($matches{1});
1597 if ($matches{2} == "/>"){
1598 $tagtype = 3;
1599 $pos++;
1600 }
1601 return Array($tagname, $attary, $tagtype, $lt, $pos);
1602 }
a3daaaf3 1603
cca46357 1604 /**
8bd0068d 1605 * There are several types of attributes, with optional
1606 * [:space:] between members.
1607 * Type 1:
1608 * attrname[:space:]=[:space:]'CDATA'
1609 * Type 2:
1610 * attrname[:space:]=[:space:]"CDATA"
1611 * Type 3:
1612 * attr[:space:]=[:space:]CDATA
1613 * Type 4:
1614 * attrname
1615 *
1616 * We leave types 1 and 2 the same, type 3 we check for
1617 * '"' and convert to "&quot" if needed, then wrap in
1618 * double quotes. Type 4 we convert into:
1619 * attrname="yes".
1620 */
3f7c623f 1621 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
691a2d25 1622 if ($regary == false){
1623 /**
8bd0068d 1624 * Looks like body ended before the end of tag.
1625 */
691a2d25 1626 return Array(false, false, false, $lt, strlen($body));
cca46357 1627 }
691a2d25 1628 list($pos, $attname, $match) = $regary;
1629 $attname = strtolower($attname);
1630 /**
8bd0068d 1631 * We arrived at the end of attribute name. Several things possible
1632 * here:
1633 * '>' means the end of the tag and this is attribute type 4
1634 * '/' if followed by '>' means the same thing as above
1635 * '\s' means a lot of things -- look what it's followed by.
1636 * anything else means the attribute is invalid.
1637 */
691a2d25 1638 switch($match){
3d8371be 1639 case '/':
691a2d25 1640 /**
8bd0068d 1641 * This is an xhtml-style tag with a closing / at the
1642 * end, like so: <img src="blah" />. Check if it's followed
1643 * by the closing bracket. If not, then this tag is invalid
1644 */
3d8371be 1645 if (substr($body, $pos, 2) == "/>"){
691a2d25 1646 $pos++;
3d8371be 1647 $tagtype = 3;
691a2d25 1648 } else {
3d8371be 1649 $gt = sq_findnxstr($body, $pos, ">");
1650 $retary = Array(false, false, false, $lt, $gt);
1651 return $retary;
1652 }
1653 case '>':
1654 $attary{$attname} = '"yes"';
1655 return Array($tagname, $attary, $tagtype, $lt, $pos);
1656 break;
1657 default:
1658 /**
8bd0068d 1659 * Skip whitespace and see what we arrive at.
1660 */
3d8371be 1661 $pos = sq_skipspace($body, $pos);
1662 $char = substr($body, $pos, 1);
1663 /**
8bd0068d 1664 * Two things are valid here:
1665 * '=' means this is attribute type 1 2 or 3.
1666 * \w means this was attribute type 4.
1667 * anything else we ignore and re-loop. End of tag and
1668 * invalid stuff will be caught by our checks at the beginning
1669 * of the loop.
1670 */
3d8371be 1671 if ($char == "="){
1672 $pos++;
1673 $pos = sq_skipspace($body, $pos);
691a2d25 1674 /**
8bd0068d 1675 * Here are 3 possibilities:
1676 * "'" attribute type 1
1677 * '"' attribute type 2
1678 * everything else is the content of tag type 3
1679 */
3d8371be 1680 $quot = substr($body, $pos, 1);
1681 if ($quot == "'"){
1682 $regary = sq_findnxreg($body, $pos+1, "\'");
1683 if ($regary == false){
1684 return Array(false, false, false, $lt, strlen($body));
1685 }
1686 list($pos, $attval, $match) = $regary;
1687 $pos++;
1688 $attary{$attname} = "'" . $attval . "'";
1689 } else if ($quot == '"'){
1690 $regary = sq_findnxreg($body, $pos+1, '\"');
1691 if ($regary == false){
1692 return Array(false, false, false, $lt, strlen($body));
1693 }
1694 list($pos, $attval, $match) = $regary;
1695 $pos++;
1696 $attary{$attname} = '"' . $attval . '"';
1697 } else {
1698 /**
8bd0068d 1699 * These are hateful. Look for \s, or >.
1700 */
3d8371be 1701 $regary = sq_findnxreg($body, $pos, "[\s>]");
1702 if ($regary == false){
1703 return Array(false, false, false, $lt, strlen($body));
1704 }
1705 list($pos, $attval, $match) = $regary;
1706 /**
8bd0068d 1707 * If it's ">" it will be caught at the top.
1708 */
3d8371be 1709 $attval = preg_replace("/\"/s", "&quot;", $attval);
1710 $attary{$attname} = '"' . $attval . '"';
7e235a1a 1711 }
3d8371be 1712 } else if (preg_match("|[\w/>]|", $char)) {
691a2d25 1713 /**
8bd0068d 1714 * That was attribute type 4.
1715 */
3d8371be 1716 $attary{$attname} = '"yes"';
1717 } else {
1718 /**
8bd0068d 1719 * An illegal character. Find next '>' and return.
1720 */
3d8371be 1721 $gt = sq_findnxstr($body, $pos, ">");
1722 return Array(false, false, false, $lt, $gt);
451f74a2 1723 }
3d8371be 1724 break;
691a2d25 1725 }
1726 }
1727 /**
8bd0068d 1728 * The fact that we got here indicates that the tag end was never
1729 * found. Return invalid tag indication so it gets stripped.
1730 */
691a2d25 1731 return Array(false, false, false, $lt, strlen($body));
1732}
1733
1734/**
0493ed11 1735 * Translates entities into literal values so they can be checked.
8bd0068d 1736 *
0493ed11 1737 * @param $attvalue the by-ref value to check.
1738 * @param $regex the regular expression to check against.
1739 * @param $hex whether the entites are hexadecimal.
1740 * @return True or False depending on whether there were matches.
8bd0068d 1741 */
0493ed11 1742function sq_deent(&$attvalue, $regex, $hex=false){
b583c3e8 1743 $me = 'sq_deent';
0493ed11 1744 $ret_match = false;
2b665f28 1745 // remove comments
1746 //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
0493ed11 1747 preg_match_all($regex, $attvalue, $matches);
1748 if (is_array($matches) && sizeof($matches[0]) > 0){
1749 $repl = Array();
1750 for ($i = 0; $i < sizeof($matches[0]); $i++){
1751 $numval = $matches[1][$i];
1752 if ($hex){
1753 $numval = hexdec($numval);
a3daaaf3 1754 }
0493ed11 1755 $repl{$matches[0][$i]} = chr($numval);
691a2d25 1756 }
0493ed11 1757 $attvalue = strtr($attvalue, $repl);
1758 return true;
1759 } else {
1760 return false;
691a2d25 1761 }
691a2d25 1762}
1763
1764/**
8bd0068d 1765 * This function runs various checks against the attributes.
1766 *
1767 * @param $tagname String with the name of the tag.
1768 * @param $attary Array with all tag attributes.
1769 * @param $rm_attnames See description for sq_sanitize
1770 * @param $bad_attvals See description for sq_sanitize
1771 * @param $add_attr_to_tag See description for sq_sanitize
1772 * @param $message message object
1773 * @param $id message id
1774 * @return Array with modified attributes.
1775 */
da2415c1 1776function sq_fixatts($tagname,
1777 $attary,
691a2d25 1778 $rm_attnames,
1779 $bad_attvals,
1780 $add_attr_to_tag,
1781 $message,
b3af12ef 1782 $id,
3d8371be 1783 $mailbox
691a2d25 1784 ){
b583c3e8 1785 $me = 'sq_fixatts';
691a2d25 1786 while (list($attname, $attvalue) = each($attary)){
1787 /**
8bd0068d 1788 * See if this attribute should be removed.
1789 */
691a2d25 1790 foreach ($rm_attnames as $matchtag=>$matchattrs){
1791 if (preg_match($matchtag, $tagname)){
1792 foreach ($matchattrs as $matchattr){
1793 if (preg_match($matchattr, $attname)){
1794 unset($attary{$attname});
1795 continue;
1796 }
451f74a2 1797 }
451f74a2 1798 }
691a2d25 1799 }
2b665f28 1800 /**
1801 * Workaround for IE quirks
1802 */
1803 sq_fixIE_idiocy($attvalue);
1804
691a2d25 1805 /**
8bd0068d 1806 * Remove any backslashes, entities, and extraneous whitespace.
1807 */
2b665f28 1808
1809 $oldattvalue = $attvalue;
0493ed11 1810 sq_defang($attvalue);
2b665f28 1811 if ($attname == 'style' && $attvalue !== $oldattvalue) {
1812 // entities are used in the attribute value. In 99% of the cases it's there as XSS
1813 // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1814 $attvalue = "idiocy";
1815 $attary{$attname} = $attvalue;
1816 }
0493ed11 1817 sq_unspace($attvalue);
af861a34 1818
691a2d25 1819 /**
8bd0068d 1820 * Now let's run checks on the attvalues.
1821 * I don't expect anyone to comprehend this. If you do,
1822 * get in touch with me so I can drive to where you live and
1823 * shake your hand personally. :)
1824 */
691a2d25 1825 foreach ($bad_attvals as $matchtag=>$matchattrs){
1826 if (preg_match($matchtag, $tagname)){
1827 foreach ($matchattrs as $matchattr=>$valary){
1828 if (preg_match($matchattr, $attname)){
1829 /**
8bd0068d 1830 * There are two arrays in valary.
1831 * First is matches.
1832 * Second one is replacements
1833 */
691a2d25 1834 list($valmatch, $valrepl) = $valary;
da2415c1 1835 $newvalue =
691a2d25 1836 preg_replace($valmatch, $valrepl, $attvalue);
1837 if ($newvalue != $attvalue){
1838 $attary{$attname} = $newvalue;
567dc524 1839 $attvalue = $newvalue;
691a2d25 1840 }
1841 }
1842 }
451f74a2 1843 }
a3daaaf3 1844 }
567dc524 1845 if ($attname == 'style') {
1846 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1847 // 8bit and control characters in style attribute values can be used for XSS, remove them
1848 $attary{$attname} = '"disallowed character"';
1849 }
1850 preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1851 if (count($aMatch)) {
1852 foreach($aMatch[1] as $sMatch) {
1853 // url value
1854 $urlvalue = $sMatch;
1855 sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1856 $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1857 }
1858 }
691a2d25 1859 }
ff940ebc 1860 /**
567dc524 1861 * Use white list based filtering on attributes which can contain url's
ff940ebc 1862 */
567dc524 1863 else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
1864 sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1865 $attary{$attname} = $attvalue;
ff940ebc 1866 }
a3daaaf3 1867 }
691a2d25 1868 /**
8bd0068d 1869 * See if we need to append any attributes to this tag.
1870 */
691a2d25 1871 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1872 if (preg_match($matchtag, $tagname)){
1873 $attary = array_merge($attary, $addattary);
1874 }
1875 }
1876 return $attary;
451f74a2 1877}
a3daaaf3 1878
567dc524 1879/**
1880 * This function filters url's
1881 *
1882 * @param $attvalue String with attribute value to filter
1883 * @param $message message object
1884 * @param $id message id
1885 * @param $mailbox mailbox
1886 * @param $sQuote quoting characters around url's
1887 */
1888function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1889 $attvalue = trim($attvalue);
1890 if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1891 // remove the double quotes
1892 $sQuote = $attvalue[0];
1893 $attvalue = trim(substr($attvalue,1,-1));
1894 }
1895
d31f73f1 1896 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
1897 // images off by default.
afbf184c 1898 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
d31f73f1 1899
567dc524 1900 $secremoveimg = '../images/' . _("sec_remove_eng.png");
1901
1902 /**
1903 * Replace empty src tags with the blank image. src is only used
1904 * for frames, images, and image inputs. Doing a replace should
1905 * not affect them working as should be, however it will stop
1906 * IE from being kicked off when src for img tags are not set
1907 */
1908 if ($attvalue == '') {
1909 $attvalue = '"' . SM_PATH . 'images/blank.png"';
1910 } else {
1911 // first, disallow 8 bit characters and control characters
1912 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1913 switch ($attname) {
1914 case 'href':
1915 $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1916 break;
1917 default:
1918 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1919 break;
1920 }
1921 } else {
1922 $aUrl = parse_url($attvalue);
1923 if (isset($aUrl['scheme'])) {
1924 switch(strtolower($aUrl['scheme'])) {
d75e755b 1925 case 'mailto':
567dc524 1926 case 'http':
1927 case 'https':
1928 case 'ftp':
1929 if ($attname != 'href') {
1930 if ($view_unsafe_images == false) {
1931 $attvalue = $sQuote . $secremoveimg . $sQuote;
1932 } else {
1933 if (isset($aUrl['path'])) {
8bbbc757 1934
1935 // No one has been able to show that image URIs
1936 // can be exploited, so for now, no restrictions
1937 // are made at all. If this proves to be a problem,
1938 // the commented-out code below can be of help.
1939 // (One consideration is that I see nothing in this
1940 // function that specifically says that we will
1941 // only ever arrive here when inspecting an image
1942 // tag, although that does seem to be the end
1943 // result - e.g., <script src="..."> where malicious
1944 // image URIs are in fact a problem are already
1945 // filtered out elsewhere.
1946 /* ---------------------------------
567dc524 1947 // validate image extension.
1948 $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1949 if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
8bbbc757 1950 // If URI is to something other than
1951 // a regular image file, get the contents
1952 // and try to see if it is an image.
1953 // Don't use Fileinfo (finfo_file()) because
1954 // we'd need to make the admin configure the
1955 // location of the magic.mime file (FIXME: add finfo_file() support later?)
1956 //
1957 $mime_type = '';
1958 if (function_exists('mime_content_type')
1959 && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
1960
1961 // fetch file
1962 //
1963 $file_contents = '';
1964 while (!feof($FILE)) {
1965 $file_contents .= fread($FILE, 8192);
1966 }
1967 fclose($FILE);
1968
1969 // store file locally
1970 //
1971 global $attachment_dir, $username;
1972 $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
1973 $localfilename = GenerateRandomString(32, '', 7);
1974 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1975 while (file_exists($full_localfilename)) {
1976 $localfilename = GenerateRandomString(32, '', 7);
1977 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1978 }
1979 $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
1980 fwrite($FILE, $file_contents);
1981 fclose($FILE);
1982
1983 // get mime type and remove file
1984 //
1985 $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
1986 unlink("$hashed_attachment_dir/$localfilename");
1987 }
1988 // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
1989 if (substr(strtolower($mime_type), 0, 5) != 'image') {
1990 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1991 }
567dc524 1992 }
8bbbc757 1993 --------------------------------- */
567dc524 1994 } else {
1995 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1996 }
1997 }
cf088f55 1998 } else {
1999 $attvalue = $sQuote . $attvalue . $sQuote;
567dc524 2000 }
2001 break;
2002 case 'outbind':
2003 /**
2004 * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
2005 * One day MS might actually make it match something useful, for now, falling
2006 * back to using cid2http, so we can grab the blank.png.
2007 */
cf088f55 2008 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 2009 break;
2010 case 'cid':
2011 /**
2012 * Turn cid: urls into http-friendly ones.
2013 */
cf088f55 2014 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 2015 break;
2016 default:
2017 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2018 break;
2019 }
2020 } else {
b1fbb25f 2021 if (!isset($aUrl['path']) || $aUrl['path'] != $secremoveimg) {
567dc524 2022 // parse_url did not lead to satisfying result
2023 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2024 }
2025 }
2026 }
2027 }
2028}
2029
691a2d25 2030/**
8bd0068d 2031 * This function edits the style definition to make them friendly and
2032 * usable in SquirrelMail.
2033 *
2034 * @param $message the message object
2035 * @param $id the message id
2036 * @param $content a string with whatever is between <style> and </style>
2037 * @param $mailbox the message mailbox
2038 * @return a string with edited content.
2039 */
e60a299a 2040function sq_fixstyle($body, $pos, $message, $id, $mailbox){
b583c3e8 2041 $me = 'sq_fixstyle';
7e2ff844 2042 // workaround for </style> in between comments
2043 $iCurrentPos = $pos;
2044 $content = '';
2045 $sToken = '';
2046 $bSucces = false;
2047 $bEndTag = false;
2048 for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
2049 $char = $body{$i};
2050 switch ($char) {
2051 case '<':
10c0caeb 2052 $sToken = $char;
7e2ff844 2053 break;
2054 case '/':
2055 if ($sToken == '<') {
2056 $sToken .= $char;
2057 $bEndTag = true;
2058 } else {
2059 $content .= $char;
2060 }
2061 break;
2062 case '>':
2063 if ($bEndTag) {
2064 $sToken .= $char;
2065 if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
2066 $newpos = $i + 1;
2067 $bSucces = true;
2068 break 2;
2069 } else {
2070 $content .= $sToken;
2071 }
2072 $bEndTag = false;
2073 } else {
2074 $content .= $char;
2075 }
2076 break;
2077 case '!':
2078 if ($sToken == '<') {
2079 // possible comment
2080 if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
2081 $i = strpos($body,'-->',$i+3);
2b665f28 2082 if ($i === false) { // no end comment
2083 $i = strlen($body);
2084 }
7e2ff844 2085 $sToken = '';
2086 }
2087 } else {
2088 $content .= $char;
2089 }
2090 break;
2091 default:
2092 if ($bEndTag) {
2093 $sToken .= $char;
2094 } else {
2095 $content .= $char;
2096 }
2097 break;
2098 }
2099 }
2100 if ($bSucces == FALSE){
7d06541f 2101 return array(FALSE, strlen($body));
2102 }
7e2ff844 2103
2b665f28 2104
2105
691a2d25 2106 /**
9ebace19 2107 * First look for general BODY style declaration, which would be
2108 * like so:
2109 * body {background: blah-blah}
2110 * and change it to .bodyclass so we can just assign it to a <div>
2111 */
691a2d25 2112 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
3d8371be 2113 $secremoveimg = '../images/' . _("sec_remove_eng.png");
691a2d25 2114 /**
0493ed11 2115 * Fix url('blah') declarations.
2116 */
2117 // $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
2118 // "url(\\1$secremoveimg\\2)", $content);
2b665f28 2119
567dc524 2120 // first check for 8bit sequences and disallowed control characters
2121 if (preg_match('/[\16-\37\200-\377]+/',$content)) {
2122 $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
2123 return array($content, $newpos);
2124 }
2125
2b665f28 2126 // IE Sucks hard. We have a special function for it.
2127 sq_fixIE_idiocy($content);
2128
2129 // remove @import line
2130 $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2131
5b4884be 2132 // translate ur\l and variations (IE parses that)
2b665f28 2133 // TODO check if the sq_fixIE_idiocy function already handles this.
5b4884be 2134 $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
567dc524 2135 preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2136 if (count($aMatch)) {
2137 $aValue = $aReplace = array();
2138 foreach($aMatch[1] as $sMatch) {
2139 // url value
2140 $urlvalue = $sMatch;
2141 sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2142 $aValue[] = $sMatch;
2143 $aReplace[] = $urlvalue;
0493ed11 2144 }
567dc524 2145 $content = str_replace($aValue,$aReplace,$content);
691a2d25 2146 }
567dc524 2147
9ebace19 2148 /**
2149 * Remove any backslashes, entities, and extraneous whitespace.
2150 */
0493ed11 2151 $contentTemp = $content;
2152 sq_defang($contentTemp);
2153 sq_unspace($contentTemp);
a3daaaf3 2154
691a2d25 2155 /**
8bd0068d 2156 * Fix stupid css declarations which lead to vulnerabilities
2157 * in IE.
39352565 2158 *
2159 * Also remove "position" attribute, as it can easily be set
2160 * to "fixed" or "absolute" with "left" and "top" attributes
2161 * of zero, taking over the whole content frame. It can also
2162 * be set to relative and move itself anywhere it wants to,
2163 * displaying content in areas it shouldn't be allowed to touch.
8bd0068d 2164 */
5db90261 2165 $match = Array('/\/\*.*\*\//',
2166 '/expression/i',
0493ed11 2167 '/behaviou*r/i',
2168 '/binding/i',
2b665f28 2169 '/include-source/i',
2170 '/javascript/i',
39352565 2171 '/script/i',
2172 '/position/i');
2173 $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
0493ed11 2174 $contentNew = preg_replace($match, $replace, $contentTemp);
2175 if ($contentNew !== $contentTemp) {
2176 // insecure css declarations are used. From now on we don't care
2177 // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2178 $content = $contentNew;
2179 }
7d06541f 2180 return array($content, $newpos);
691a2d25 2181}
a3daaaf3 2182
0493ed11 2183
691a2d25 2184/**
8bd0068d 2185 * This function converts cid: url's into the ones that can be viewed in
2186 * the browser.
2187 *
2188 * @param $message the message object
2189 * @param $id the message id
2190 * @param $cidurl the cid: url.
2191 * @param $mailbox the message mailbox
2192 * @return a string with a http-friendly url
2193 */
b3af12ef 2194function sq_cid2http($message, $id, $cidurl, $mailbox){
691a2d25 2195 /**
8bd0068d 2196 * Get rid of quotes.
2197 */
691a2d25 2198 $quotchar = substr($cidurl, 0, 1);
2dd879b8 2199 if ($quotchar == '"' || $quotchar == "'"){
2200 $cidurl = str_replace($quotchar, "", $cidurl);
2201 } else {
2202 $quotchar = '';
2203 }
691a2d25 2204 $cidurl = substr(trim($cidurl), 4);
0493ed11 2205
2206 $match_str = '/\{.*?\}\//';
2207 $str_rep = '';
2208 $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2209
e5e9381a 2210 $linkurl = find_ent_id($cidurl, $message);
9ebace19 2211 /* in case of non-safe cid links $httpurl should be replaced by a sort of
2212 unsafe link image */
e5e9381a 2213 $httpurl = '';
c8f5f606 2214
8bd0068d 2215 /**
2216 * This is part of a fix for Outlook Express 6.x generating
2217 * cid URLs without creating content-id headers. These images are
2218 * not part of the multipart/related html mail. The html contains
2219 * <img src="cid:{some_id}/image_filename.ext"> references to
2220 * attached images with as goal to render them inline although
2221 * the attachment disposition property is not inline.
2222 */
c8f5f606 2223
2224 if (empty($linkurl)) {
2225 if (preg_match('/{.*}\//', $cidurl)) {
2226 $cidurl = preg_replace('/{.*}\//','', $cidurl);
2227 if (!empty($cidurl)) {
2228 $linkurl = find_ent_id($cidurl, $message);
2229 }
2230 }
2231 }
f8a1ed5a 2232
c8f5f606 2233 if (!empty($linkurl)) {
fa26ab45 2234 $httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&amp;' .
8bd0068d 2235 "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2236 '&amp;ent_id=' . $linkurl . $quotchar;
c8f5f606 2237 } else {
2238 /**
2239 * If we couldn't generate a proper img url, drop in a blank image
2240 * instead of sending back empty, otherwise it causes unusual behaviour
2241 */
bc017c1d 2242 $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
e5e9381a 2243 }
f8a1ed5a 2244
691a2d25 2245 return $httpurl;
2246}
2247
2248/**
8bd0068d 2249 * This function changes the <body> tag into a <div> tag since we
2250 * can't really have a body-within-body.
2251 *
2252 * @param $attary an array of attributes and values of <body>
2253 * @param $mailbox mailbox we're currently reading (for cid2http)
2254 * @param $message current message (for cid2http)
2255 * @param $id current message id (for cid2http)
2256 * @return a modified array of attributes to be set for <div>
2257 */
2dd879b8 2258function sq_body2div($attary, $mailbox, $message, $id){
b583c3e8 2259 $me = 'sq_body2div';
3d8371be 2260 $divattary = Array('class' => "'bodyclass'");
b583c3e8 2261 $text = '#000000';
c189a963 2262 $has_bgc_stl = $has_txt_stl = false;
b583c3e8 2263 $styledef = '';
691a2d25 2264 if (is_array($attary) && sizeof($attary) > 0){
2265 foreach ($attary as $attname=>$attvalue){
2266 $quotchar = substr($attvalue, 0, 1);
2267 $attvalue = str_replace($quotchar, "", $attvalue);
2268 switch ($attname){
3d8371be 2269 case 'background':
8bd0068d 2270 $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
3d8371be 2271 $styledef .= "background-image: url('$attvalue'); ";
2272 break;
2273 case 'bgcolor':
c189a963 2274 $has_bgc_stl = true;
3d8371be 2275 $styledef .= "background-color: $attvalue; ";
2276 break;
2277 case 'text':
c189a963 2278 $has_txt_stl = true;
3d8371be 2279 $styledef .= "color: $attvalue; ";
2280 break;
691a2d25 2281 }
a3daaaf3 2282 }
c189a963 2283 // Outlook defines a white bgcolor and no text color. This can lead to
2284 // white text on a white bg with certain themes.
2285 if ($has_bgc_stl && !$has_txt_stl) {
2286 $styledef .= "color: $text; ";
2287 }
691a2d25 2288 if (strlen($styledef) > 0){
2289 $divattary{"style"} = "\"$styledef\"";
2290 }
2291 }
2292 return $divattary;
2293}
a3daaaf3 2294
691a2d25 2295/**
8bd0068d 2296 * This is the main function and the one you should actually be calling.
2297 * There are several variables you should be aware of an which need
2298 * special description.
2299 *
2300 * Since the description is quite lengthy, see it here:
2301 * http://linux.duke.edu/projects/mini/htmlfilter/
2302 *
2303 * @param $body the string with HTML you wish to filter
2304 * @param $tag_list see description above
2305 * @param $rm_tags_with_content see description above
2306 * @param $self_closing_tags see description above
2307 * @param $force_tag_closing see description above
2308 * @param $rm_attnames see description above
2309 * @param $bad_attvals see description above
2310 * @param $add_attr_to_tag see description above
2311 * @param $message message object
2312 * @param $id message id
2313 * @return sanitized html safe to show on your pages.
2314 */
da2415c1 2315function sq_sanitize($body,
8bd0068d 2316 $tag_list,
2317 $rm_tags_with_content,
2318 $self_closing_tags,
2319 $force_tag_closing,
2320 $rm_attnames,
2321 $bad_attvals,
2322 $add_attr_to_tag,
2323 $message,
2324 $id,
2325 $mailbox
2326 ){
b583c3e8 2327 $me = 'sq_sanitize';
7d06541f 2328 $rm_tags = array_shift($tag_list);
691a2d25 2329 /**
8bd0068d 2330 * Normalize rm_tags and rm_tags_with_content.
2331 */
7d06541f 2332 @array_walk($tag_list, 'sq_casenormalize');
691a2d25 2333 @array_walk($rm_tags_with_content, 'sq_casenormalize');
2334 @array_walk($self_closing_tags, 'sq_casenormalize');
2335 /**
8bd0068d 2336 * See if tag_list is of tags to remove or tags to allow.
2337 * false means remove these tags
2338 * true means allow these tags
2339 */
691a2d25 2340 $curpos = 0;
2341 $open_tags = Array();
2dd879b8 2342 $trusted = "\n<!-- begin sanitized html -->\n";
691a2d25 2343 $skip_content = false;
bb8d0799 2344 /**
8bd0068d 2345 * Take care of netscape's stupid javascript entities like
2346 * &{alert('boo')};
2347 */
bb8d0799 2348 $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
691a2d25 2349
7d06541f 2350 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
691a2d25 2351 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
2352 $free_content = substr($body, $curpos, $lt-$curpos);
2353 /**
8bd0068d 2354 * Take care of <style>
2355 */
7d06541f 2356 if ($tagname == "style" && $tagtype == 1){
da2415c1 2357 list($free_content, $curpos) =
e60a299a 2358 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
7d06541f 2359 if ($free_content != FALSE){
1d398b1d 2360 if ( !empty($attary) ) {
2361 $attary = sq_fixatts($tagname,
2362 $attary,
2363 $rm_attnames,
2364 $bad_attvals,
2365 $add_attr_to_tag,
2366 $message,
2367 $id,
2368 $mailbox
2369 );
2370 }
7d06541f 2371 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2372 $trusted .= $free_content;
2373 $trusted .= sq_tagprint($tagname, false, 2);
2374 }
2375 continue;
691a2d25 2376 }
2377 if ($skip_content == false){
2378 $trusted .= $free_content;
691a2d25 2379 }
2380 if ($tagname != FALSE){
2381 if ($tagtype == 2){
2382 if ($skip_content == $tagname){
2383 /**
8bd0068d 2384 * Got to the end of tag we needed to remove.
2385 */
691a2d25 2386 $tagname = false;
2387 $skip_content = false;
2388 } else {
2389 if ($skip_content == false){
c828931c 2390 if ($tagname == "body"){
2391 $tagname = "div";
2dd879b8 2392 }
da2415c1 2393 if (isset($open_tags{$tagname}) &&
8bd0068d 2394 $open_tags{$tagname} > 0){
2dd879b8 2395 $open_tags{$tagname}--;
691a2d25 2396 } else {
2dd879b8 2397 $tagname = false;
691a2d25 2398 }
691a2d25 2399 }
2400 }
2401 } else {
2402 /**
8bd0068d 2403 * $rm_tags_with_content
2404 */
691a2d25 2405 if ($skip_content == false){
2406 /**
8bd0068d 2407 * See if this is a self-closing type and change
2408 * tagtype appropriately.
2409 */
691a2d25 2410 if ($tagtype == 1
8bd0068d 2411 && in_array($tagname, $self_closing_tags)){
2dd879b8 2412 $tagtype = 3;
691a2d25 2413 }
2414 /**
8bd0068d 2415 * See if we should skip this tag and any content
2416 * inside it.
2417 */
691a2d25 2418 if ($tagtype == 1 &&
8bd0068d 2419 in_array($tagname, $rm_tags_with_content)){
691a2d25 2420 $skip_content = $tagname;
2421 } else {
da2415c1 2422 if (($rm_tags == false
8bd0068d 2423 && in_array($tagname, $tag_list)) ||
2424 ($rm_tags == true &&
2425 !in_array($tagname, $tag_list))){
691a2d25 2426 $tagname = false;
2427 } else {
2dd879b8 2428 /**
8bd0068d 2429 * Convert body into div.
2430 */
2dd879b8 2431 if ($tagname == "body"){
2432 $tagname = "div";
da2415c1 2433 $attary = sq_body2div($attary, $mailbox,
8bd0068d 2434 $message, $id);
2dd879b8 2435 }
691a2d25 2436 if ($tagtype == 1){
2437 if (isset($open_tags{$tagname})){
2438 $open_tags{$tagname}++;
2439 } else {
2440 $open_tags{$tagname}=1;
2441 }
2442 }
2443 /**
8bd0068d 2444 * This is where we run other checks.
2445 */
691a2d25 2446 if (is_array($attary) && sizeof($attary) > 0){
2447 $attary = sq_fixatts($tagname,
8bd0068d 2448 $attary,
2449 $rm_attnames,
2450 $bad_attvals,
2451 $add_attr_to_tag,
2452 $message,
2453 $id,
2454 $mailbox
2455 );
691a2d25 2456 }
2457 }
2458 }
691a2d25 2459 }
2460 }
2461 if ($tagname != false && $skip_content == false){
2462 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2463 }
691a2d25 2464 }
2465 $curpos = $gt+1;
a3daaaf3 2466 }
691a2d25 2467 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2468 if ($force_tag_closing == true){
2469 foreach ($open_tags as $tagname=>$opentimes){
2470 while ($opentimes > 0){
2471 $trusted .= '</' . $tagname . '>';
2472 $opentimes--;
2473 }
2474 }
2475 $trusted .= "\n";
2476 }
2477 $trusted .= "<!-- end sanitized html -->\n";
2478 return $trusted;
2479}
451f74a2 2480
691a2d25 2481/**
8bd0068d 2482 * This is a wrapper function to call html sanitizing routines.
2483 *
2484 * @param $body the body of the message
2485 * @param $id the id of the message
c189a963 2486
2487 * @param $message
2488 * @param $mailbox
2489 * @param boolean $take_mailto_links When TRUE, converts mailto: links
2490 * into internal SM compose links
2491 * (optional; default = TRUE)
8bd0068d 2492 * @return a string with html safe to display in the browser.
2493 */
c189a963 2494function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2495
202bcbcc 2496 // require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
c189a963 2497
691a2d25 2498 global $attachment_common_show_images, $view_unsafe_images,
8bd0068d 2499 $has_unsafe_images;
691a2d25 2500 /**
8bd0068d 2501 * Don't display attached images in HTML mode.
2b665f28 2502 *
d0187bd6 2503 * SB: why?
8bd0068d 2504 */
691a2d25 2505 $attachment_common_show_images = false;
2506 $tag_list = Array(
8bd0068d 2507 false,
2508 "object",
2509 "meta",
2510 "html",
2511 "head",
2512 "base",
2513 "link",
2514 "frame",
2515 "iframe",
2516 "plaintext",
2517 "marquee"
2518 );
691a2d25 2519
2520 $rm_tags_with_content = Array(
8bd0068d 2521 "script",
2522 "applet",
2523 "embed",
2524 "title",
2525 "frameset",
0493ed11 2526 "xmp",
8bd0068d 2527 "xml"
2528 );
691a2d25 2529
2530 $self_closing_tags = Array(
8bd0068d 2531 "img",
2532 "br",
2533 "hr",
2534 "input",
2535 "outbind"
2536 );
691a2d25 2537
2dd879b8 2538 $force_tag_closing = true;
691a2d25 2539
2540 $rm_attnames = Array(
8bd0068d 2541 "/.*/" =>
2542 Array(
2543 "/target/i",
2544 "/^on.*/i",
2545 "/^dynsrc/i",
2546 "/^data.*/i",
2547 "/^lowsrc.*/i"
2548 )
2549 );
691a2d25 2550
2551 $secremoveimg = "../images/" . _("sec_remove_eng.png");
2552 $bad_attvals = Array(
8bd0068d 2553 "/.*/" =>
691a2d25 2554 Array(
0a6ec9b5 2555 "/^src|background/i" =>
8bd0068d 2556 Array(
691a2d25 2557 Array(
8bd0068d 2558 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2559 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2560 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
691a2d25 2561 ),
8bd0068d 2562 Array(
2563 "\\1$secremoveimg\\2",
2564 "\\1$secremoveimg\\2",
2565 "\\1$secremoveimg\\2",
8bd0068d 2566 )
2567 ),
0a6ec9b5 2568 "/^href|action/i" =>
8bd0068d 2569 Array(
0a6ec9b5 2570 Array(
8bd0068d 2571 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2572 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2573 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
0a6ec9b5 2574 ),
691a2d25 2575 Array(
8bd0068d 2576 "\\1#\\1",
2577 "\\1#\\1",
2578 "\\1#\\1"
02474e43 2579 )
8bd0068d 2580 ),
2581 "/^style/i" =>
2582 Array(
2583 Array(
5db90261 2584 "/\/\*.*\*\//",
8bd0068d 2585 "/expression/i",
2586 "/binding/i",
2587 "/behaviou*r/i",
2588 "/include-source/i",
39352565 2589
2590 // position:relative can also be exploited
2591 // to put content outside of email body area
2592 // and position:fixed is similarly exploitable
2593 // as position:absolute, so we'll remove it
2594 // altogether....
2595 //
2596 // Does this screw up legitimate HTML messages?
2597 // If so, the only fix I see is to allow position
2598 // attributes (any values? I think we still have
2599 // to block static and fixed) only if $use_iframe
2600 // is enabled (1.5.0+)
2601 //
2602 // was: "/position\s*:\s*absolute/i",
2603 //
2604 "/position\s*:/i",
2605
1d935bc2 2606 "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
8bd0068d 2607 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2608 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2609 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
39352565 2610 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
8bd0068d 2611 ),
2612 Array(
5db90261 2613 "",
8bd0068d 2614 "idiocy",
2615 "idiocy",
2616 "idiocy",
2617 "idiocy",
567dc524 2618 "idiocy",
5b4884be 2619 "url",
8bd0068d 2620 "url(\\1#\\1)",
2621 "url(\\1#\\1)",
2622 "url(\\1#\\1)",
8bd0068d 2623 "\\1:url(\\2#\\3)"
2624 )
691a2d25 2625 )
8bd0068d 2626 )
691a2d25 2627 );
9ebace19 2628
d31f73f1 2629 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
2630 // images off by default.
afbf184c 2631 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
9ebace19 2632
691a2d25 2633 if (!$view_unsafe_images){
2634 /**
8bd0068d 2635 * Remove any references to http/https if view_unsafe_images set
2636 * to false.
2637 */
02474e43 2638 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
8bd0068d 2639 '/^([\'\"])\s*https*:.*([\'\"])/si');
02474e43 2640 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
8bd0068d 2641 "\\1$secremoveimg\\1");
02474e43 2642 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
7ef0b415 2643 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
02474e43 2644 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
8bd0068d 2645 "url(\\1$secremoveimg\\1)");
691a2d25 2646 }
451f74a2 2647
691a2d25 2648 $add_attr_to_tag = Array(
8bd0068d 2649 "/^a$/i" =>
c25f2fbb 2650 Array('target'=>'"_blank"',
02474e43 2651 'title'=>'"'._("This external link will open in a new window").'"'
8bd0068d 2652 )
2653 );
da2415c1 2654 $trusted = sq_sanitize($body,
8bd0068d 2655 $tag_list,
2656 $rm_tags_with_content,
2657 $self_closing_tags,
2658 $force_tag_closing,
2659 $rm_attnames,
2660 $bad_attvals,
2661 $add_attr_to_tag,
2662 $message,
2663 $id,
2664 $mailbox
2665 );
567dc524 2666 if (strpos($trusted,$secremoveimg)){
691a2d25 2667 $has_unsafe_images = true;
da2415c1 2668 }
c189a963 2669
2670 // we want to parse mailto's in HTML output, change to SM compose links
2671 // this is a modified version of code from url_parser.php... but Marc is
2672 // right: we need a better filtering implementation; adding this randomly
2673 // here is not a great solution
2674 //
2675 if ($take_mailto_links) {
2676 // parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
2677 global $MailTo_PReg_Match;
202bcbcc 2678 $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
c189a963 2679 if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2680 foreach ($regs[0] as $i => $mailto_before) {
2681 $mailto_params = $regs[10][$i];
2682 // get rid of any tailing quote since we have to add send_to to the end
2683 //
2684 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
2685 $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
2686 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
2687 $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
2688
2689 if ($regs[1][$i]) { //if there is an email addr before '?', we need to merge it with the params
2690 $to = 'to=' . $regs[1][$i];
2691 if (strpos($mailto_params, 'to=') > -1) //already a 'to='
2692 $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2693 else {
2694 if ($mailto_params) //already some params, append to them
2695 $mailto_params .= '&amp;' . $to;
2696 else
2697 $mailto_params .= '?' . $to;
2698 }
2699 }
2700
2701 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2702
2703 // we'll already have target=_blank, no need to allow comp_in_new
2704 // here (which would be a lot more work anyway)
2705 //
2706 global $compose_new_win;
2707 $temp_comp_in_new = $compose_new_win;
2708 $compose_new_win = 0;
2709 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2710 $compose_new_win = $temp_comp_in_new;
2711
2712 // remove <a href=" and anything after the next quote (we only
2713 // need the uri, not the link HTML) in compose uri
2714 //
2715 $comp_uri = substr($comp_uri, 9);
2716 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2717 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2718 }
2719 }
2720 }
2721
691a2d25 2722 return $trusted;
451f74a2 2723}
a4a70693 2724
da2415c1 2725/**
8bd0068d 2726 * function SendDownloadHeaders - send file to the browser
2727 *
2728 * Original Source: SM core src/download.php
2729 * moved here to make it available to other code, and separate
2730 * front end from back end functionality.
2731 *
2732 * @param string $type0 first half of mime type
2733 * @param string $type1 second half of mime type
2734 * @param string $filename filename to tell the browser for downloaded file
2735 * @param boolean $force whether to force the download dialog to pop
2736 * @param optional integer $filesize send the Content-Header and length to the browser
2737 * @return void
2738 */
02474e43 2739function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2740 global $languages, $squirrelmail_language;
cfffd60b 2741 $isIE = $isIE6plus = false;
02474e43 2742
2743 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2744
2745 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
8bd0068d 2746 strstr($HTTP_USER_AGENT, 'Opera') === false) {
cfffd60b 2747 $isIE = true;
02474e43 2748 }
2749
cfffd60b 2750 if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2751 ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2752 $isIE6plus = true;
02474e43 2753 }
2754
2755 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 2756 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
02474e43 2757 $filename =
8bd0068d 2758 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
02474e43 2759 } else {
1a4bc4a6 2760 $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&nbsp;', ' ', $filename));
02474e43 2761 }
2762
2763 // A Pox on Microsoft and it's Internet Explorer!
2764 //
2765 // IE has lots of bugs with file downloads.
2766 // It also has problems with SSL. Both of these cause problems
2767 // for us in this function.
2768 //
2769 // See this article on Cache Control headers and SSL
2770 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2771 //
2772 // The best thing you can do for IE is to upgrade to the latest
2773 // version
2774 //set all the Cache Control Headers for IE
2775 if ($isIE) {
2776 $filename=rawurlencode($filename);
2777 header ("Pragma: public");
8bd0068d 2778 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
02474e43 2779 header ("Cache-Control: post-check=0, pre-check=0", false);
8bd0068d 2780 header ("Cache-Control: private");
02474e43 2781
2782 //set the inline header for IE, we'll add the attachment header later if we need it
2783 header ("Content-Disposition: inline; filename=$filename");
2784 }
2785
2786 if (!$force) {
2787 // Try to show in browser window
2788 header ("Content-Disposition: inline; filename=\"$filename\"");
2789 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2790 } else {
2791 // Try to pop up the "save as" box
2792
2793 // IE makes this hard. It pops up 2 save boxes, or none.
2794 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2795 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2796 // But, according to Microsoft, it is "RFC compliant but doesn't
2797 // take into account some deviations that allowed within the
2798 // specification." Doesn't that mean RFC non-compliant?
2799 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2800
2801 // all browsers need the application/octet-stream header for this
2802 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2803
2804 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2805 // Do not have quotes around filename, but that applied to
2806 // "attachment"... does it apply to inline too?
2807 header ("Content-Disposition: attachment; filename=\"$filename\"");
2808
cfffd60b 2809 if ($isIE && !$isIE6plus) {
02474e43 2810 // This combination seems to work mostly. IE 5.5 SP 1 has
2811 // known issues (see the Microsoft Knowledge Base)
2812
2813 // This works for most types, but doesn't work with Word files
2814 header ("Content-Type: application/download; name=\"$filename\"");
7e2ff844 2815 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2816 // These are spares, just in case. :-)
2817 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2818 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2819 //header("Content-Type: application/octet-stream; name=\"$filename\"");
7e2ff844 2820 } else if ($isIE) {
2821 // This is to prevent IE for MIME sniffing and auto open a file in IE
2822 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2823 } else {
2824 // another application/octet-stream forces download for Netscape
2825 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2826 }
2827 }
2828
2829 //send the content-length header if the calling function provides it
2830 if ($filesize > 0) {
2831 header("Content-Length: $filesize");
2832 }
07c49f57 2833
8d863f64 2834} // end fn SendDownloadHeaders
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