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