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[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 *
79ba18dc 9 * @copyright 1999-2013 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
821d1f14 809// FIXME: spaces are allowed inside quoted-printable encoding, but the following line will bust up any such encoded strings
098ea084 810 $aString = explode(' ',$string);
08b7f7cc 811 $ret = '';
098ea084 812 foreach ($aString as $chunk) {
358a78a1 813 if ($encoded && $chunk === '') {
08b7f7cc 814 continue;
358a78a1 815 } elseif ($chunk === '') {
08b7f7cc 816 $ret .= ' ';
817 continue;
818 }
098ea084 819 $encoded = false;
08b7f7cc 820 /* if encoded words are not separated by a linear-space-white we still catch them */
821 $j = $i-1;
7e6ca3e8 822
08b7f7cc 823 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
824 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
825 if ($iLastMatch !== $j) {
bcae324b 826 if ($htmlsafe) {
9f7f68c3 827 $ret .= '&#32;';
08b7f7cc 828 } else {
829 $ret .= ' ';
830 }
831 }
832 $iLastMatch = $i;
833 $j = $i;
bcae324b 834 if ($htmlsafe) {
3047e291 835 $ret .= sm_encode_html_special_chars($res[1]);
cb718de0 836 } else {
837 $ret .= $res[1];
838 }
098ea084 839 $encoding = ucfirst($res[3]);
d6f584fc 840
841 /* decide about valid decoding */
842 if ($decide && is_conversion_safe($res[2])) {
8bd0068d 843 $utfencode=true;
844 $can_be_encoded=true;
d6f584fc 845 } else {
8bd0068d 846 $can_be_encoded=false;
d6f584fc 847 }
098ea084 848 switch ($encoding)
849 {
8bd0068d 850 case 'B':
851 $replace = base64_decode($res[4]);
852 if ($utfencode) {
853 if ($can_be_encoded) {
854 /* convert string to different charset,
855 * if functions asks for it (usually in compose)
856 */
bcae324b 857 $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
8bd0068d 858 } else {
859 // convert string to html codes in order to display it
860 $ret .= charset_decode($res[2],$replace);
861 }
fab65ca9 862 } else {
bcae324b 863 if ($htmlsafe) {
3047e291 864 $replace = sm_encode_html_special_chars($replace);
8bd0068d 865 }
866 $ret.= $replace;
fab65ca9 867 }
8bd0068d 868 break;
869 case 'Q':
870 $replace = str_replace('_', ' ', $res[4]);
6c4e2e9b 871 $replace = preg_replace_callback('/=([0-9a-f]{2})/i',
872 create_function ('$matches', 'return chr(hexdec($matches[1]));'),
8bd0068d 873 $replace);
874 if ($utfencode) {
875 if ($can_be_encoded) {
876 /* convert string to different charset,
877 * if functions asks for it (usually in compose)
878 */
bcae324b 879 $replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
8bd0068d 880 } else {
881 // convert string to html codes in order to display it
882 $replace = charset_decode($res[2], $replace);
883 }
884 } else {
bcae324b 885 if ($htmlsafe) {
3047e291 886 $replace = sm_encode_html_special_chars($replace);
8bd0068d 887 }
098ea084 888 }
8bd0068d 889 $ret .= $replace;
890 break;
891 default:
892 break;
79e07c7e 893 }
098ea084 894 $chunk = $res[5];
895 $encoded = true;
08b7f7cc 896 }
897 if (!$encoded) {
bcae324b 898 if ($htmlsafe) {
9f7f68c3 899 $ret .= '&#32;';
08b7f7cc 900 } else {
901 $ret .= ' ';
da2415c1 902 }
08b7f7cc 903 }
dc3d13a7 904
bcae324b 905 if (!$encoded && $htmlsafe) {
3047e291 906 $ret .= sm_encode_html_special_chars($chunk);
dc3d13a7 907 } else {
908 $ret .= $chunk;
909 }
098ea084 910 ++$i;
911 }
fd81e884 912 /* remove the first added space */
913 if ($ret) {
bcae324b 914 if ($htmlsafe) {
9f7f68c3 915 $ret = substr($ret,5);
fd81e884 916 } else {
917 $ret = substr($ret,1);
918 }
919 }
da2415c1 920
08b7f7cc 921 return $ret;
451f74a2 922}
923
9f7f68c3 924/**
a24cf710 925 * Encodes header
8bd0068d 926 *
a24cf710 927 * Function uses XTRA_CODE _encodeheader function, if such function exists.
a24cf710 928 *
758a7889 929 * Function uses Q encoding by default and encodes a string according to RFC
930 * 1522 for use in headers if it contains 8-bit characters or anything that
a24cf710 931 * looks like it should be encoded.
8bd0068d 932 *
758a7889 933 * Function switches to B encoding and encodeHeaderBase64() function, if
934 * string is 8bit and multibyte character set supported by mbstring extension
935 * is used. It can cause E_USER_NOTICE errors, if interface is used with
f270a6eb 936 * multibyte character set unsupported by mbstring extension.
937 *
8bd0068d 938 * @param string $string header string, that has to be encoded
939 * @return string quoted-printable encoded string
f270a6eb 940 * @todo make $mb_charsets system wide constant
8bd0068d 941 */
451f74a2 942function encodeHeader ($string) {
6fbd125b 943 global $default_charset, $languages, $squirrelmail_language;
83be314a 944
10dec454 945 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 946 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
33a55f5a 947 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
83be314a 948 }
793cc001 949
a24cf710 950 // Use B encoding for multibyte charsets
f270a6eb 951 $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
952 if (in_array($default_charset,$mb_charsets) &&
953 in_array($default_charset,sq_mb_list_encodings()) &&
954 sq_is8bit($string)) {
955 return encodeHeaderBase64($string,$default_charset);
956 } elseif (in_array($default_charset,$mb_charsets) &&
957 sq_is8bit($string) &&
958 ! in_array($default_charset,sq_mb_list_encodings())) {
959 // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
960 // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
961 }
a24cf710 962
451f74a2 963 // Encode only if the string contains 8-bit characters or =?
3d8371be 964 $j = strlen($string);
098ea084 965 $max_l = 75 - strlen($default_charset) - 7;
966 $aRet = array();
451f74a2 967 $ret = '';
c96c32f4 968 $iEncStart = $enc_init = false;
0d53f0f9 969 $cur_l = $iOffset = 0;
3d8371be 970 for($i = 0; $i < $j; ++$i) {
c96c32f4 971 switch($string{$i})
972 {
6b76cffa 973 case '"':
8bd0068d 974 case '=':
975 case '<':
976 case '>':
977 case ',':
978 case '?':
979 case '_':
980 if ($iEncStart === false) {
981 $iEncStart = $i;
982 }
983 $cur_l+=3;
984 if ($cur_l > ($max_l-2)) {
985 /* if there is an stringpart that doesn't need encoding, add it */
08b7f7cc 986 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 987 $aRet[] = "=?$default_charset?Q?$ret?=";
988 $iOffset = $i;
989 $cur_l = 0;
990 $ret = '';
991 $iEncStart = false;
08b7f7cc 992 } else {
8bd0068d 993 $ret .= sprintf("=%02X",ord($string{$i}));
c96c32f4 994 }
8bd0068d 995 break;
996 case '(':
997 case ')':
998 if ($iEncStart !== false) {
08b7f7cc 999 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
8bd0068d 1000 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 1001 $iOffset = $i;
8bd0068d 1002 $cur_l = 0;
1003 $ret = '';
1004 $iEncStart = false;
c96c32f4 1005 }
8bd0068d 1006 break;
1007 case ' ':
c96c32f4 1008 if ($iEncStart !== false) {
098ea084 1009 $cur_l++;
1010 if ($cur_l > $max_l) {
08b7f7cc 1011 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 1012 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 1013 $iOffset = $i;
1014 $cur_l = 0;
098ea084 1015 $ret = '';
8bd0068d 1016 $iEncStart = false;
08b7f7cc 1017 } else {
8bd0068d 1018 $ret .= '_';
c96c32f4 1019 }
3d8371be 1020 }
8bd0068d 1021 break;
1022 default:
1023 $k = ord($string{$i});
1024 if ($k > 126) {
1025 if ($iEncStart === false) {
1026 // do not start encoding in the middle of a string, also take the rest of the word.
1027 $sLeadString = substr($string,0,$i);
1028 $aLeadString = explode(' ',$sLeadString);
1029 $sToBeEncoded = array_pop($aLeadString);
1030 $iEncStart = $i - strlen($sToBeEncoded);
1031 $ret .= $sToBeEncoded;
1032 $cur_l += strlen($sToBeEncoded);
1033 }
1034 $cur_l += 3;
1035 /* first we add the encoded string that reached it's max size */
1036 if ($cur_l > ($max_l-2)) {
1037 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1038 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
1039 $cur_l = 3;
1040 $ret = '';
1041 $iOffset = $i;
1042 $iEncStart = $i;
1043 }
1044 $enc_init = true;
1045 $ret .= sprintf("=%02X", $k);
1046 } else {
1047 if ($iEncStart !== false) {
1048 $cur_l++;
1049 if ($cur_l > $max_l) {
1050 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1051 $aRet[] = "=?$default_charset?Q?$ret?=";
1052 $iEncStart = false;
1053 $iOffset = $i;
1054 $cur_l = 0;
1055 $ret = '';
1056 } else {
1057 $ret .= $string{$i};
1058 }
1059 }
1060 }
1061 break;
f7b3ba37 1062 }
451f74a2 1063 }
793cc001 1064
c96c32f4 1065 if ($enc_init) {
1066 if ($iEncStart !== false) {
1067 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1068 $aRet[] = "=?$default_charset?Q?$ret?=";
1069 } else {
1070 $aRet[] = substr($string,$iOffset);
1071 }
1072 $string = implode('',$aRet);
451f74a2 1073 }
3d8371be 1074 return $string;
451f74a2 1075}
b74ba498 1076
f270a6eb 1077/**
1078 * Encodes string according to rfc2047 B encoding header formating rules
1079 *
758a7889 1080 * It is recommended way to encode headers with character sets that store
f270a6eb 1081 * symbols in more than one byte.
1082 *
1083 * Function requires mbstring support. If required mbstring functions are missing,
1084 * function returns false and sets E_USER_WARNING level error message.
1085 *
758a7889 1086 * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1087 * that mbstring functions will generate E_WARNING errors, if unsupported
f270a6eb 1088 * character set is used. mb_encode_mimeheader function provided by php
1089 * mbstring extension is not used in order to get better control of header
1090 * encoding.
1091 *
758a7889 1092 * Used php code functions - function_exists(), trigger_error(), strlen()
1093 * (is used with charset names and base64 strings). Used php mbstring
f270a6eb 1094 * functions - mb_strlen and mb_substr.
1095 *
758a7889 1096 * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
f270a6eb 1097 * encoding), rfc 2822 (header folding)
1098 *
1099 * @param string $string header string that must be encoded
758a7889 1100 * @param string $charset character set. Must be supported by mbstring extension.
f270a6eb 1101 * Use sq_mb_list_encodings() to detect supported charsets.
1102 * @return string string encoded according to rfc2047 B encoding formating rules
1103 * @since 1.5.1
1104 * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1105 * @todo Do we want to control max length of header?
1106 * @todo Do we want to control EOL (end-of-line) marker?
1107 * @todo Do we want to translate error message?
1108 */
1109function encodeHeaderBase64($string,$charset) {
1110 /**
1111 * Check mbstring function requirements.
1112 */
1113 if (! function_exists('mb_strlen') ||
1114 ! function_exists('mb_substr')) {
1115 // set E_USER_WARNING
1116 trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1117 // return false
1118 return false;
1119 }
1120
1121 // initial return array
1122 $aRet = array();
1123
1124 /**
1125 * header length = 75 symbols max (same as in encodeHeader)
1126 * remove $charset length
1127 * remove =? ? ?= (5 chars)
1128 * remove 2 more chars (\r\n ?)
1129 */
1130 $iMaxLength = 75 - strlen($charset) - 7;
1131
1132 // set first character position
1133 $iStartCharNum = 0;
1134
1135 // loop through all characters. count characters and not bytes.
1136 for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1137 // encode string from starting character to current character.
1138 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1139
1140 // Check encoded string length
1141 if(strlen($encoded_string)>$iMaxLength) {
1142 // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1143 $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1144
1145 // set new starting character
1146 $iStartCharNum = $iCharNum-1;
1147
1148 // encode last char (in case it is last character in string)
1149 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1150 } // if string is shorter than max length - add next character
1151 }
1152
1153 // add last encoded string to array
1154 $aRet[] = $encoded_string;
1155
1156 // set initial return string
1157 $sRet = '';
1158
1159 // loop through encoded strings
1160 foreach($aRet as $string) {
1161 // TODO: Do we want to control EOL (end-of-line) marker
1162 if ($sRet!='') $sRet.= " ";
1163
1164 // add header tags and encoded string to return string
1165 $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1166 }
1167
1168 return $sRet;
1169}
1170
691a2d25 1171/* This function trys to locate the entity_id of a specific mime element */
3d8371be 1172function find_ent_id($id, $message) {
a171b359 1173 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1174 if ($message->entities[$i]->header->type0 == 'multipart') {
3d8371be 1175 $ret = find_ent_id($id, $message->entities[$i]);
451f74a2 1176 } else {
3d8371be 1177 if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
d8cffbab 1178// if (sq_check_save_extension($message->entities[$i])) {
8bd0068d 1179 return $message->entities[$i]->entity_id;
da2415c1 1180// }
c8f5f606 1181 } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1182 /**
1183 * This is part of a fix for Outlook Express 6.x generating
1184 * cid URLs without creating content-id headers
1185 * @@JA - 20050207
1186 */
1187 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1188 return $message->entities[$i]->entity_id;
1189 }
3d8371be 1190 }
a3daaaf3 1191 }
451f74a2 1192 }
3d8371be 1193 return $ret;
451f74a2 1194}
a3daaaf3 1195
e5e9381a 1196function sq_check_save_extension($message) {
1197 $filename = $message->getFilename();
1198 $ext = substr($filename, strrpos($filename,'.')+1);
1199 $save_extensions = array('jpg','jpeg','gif','png','bmp');
3d8371be 1200 return in_array($ext, $save_extensions);
e5e9381a 1201}
1202
1203
691a2d25 1204/**
8bd0068d 1205 ** HTMLFILTER ROUTINES
1206 */
451f74a2 1207
2dd879b8 1208/**
0493ed11 1209 * This function checks attribute values for entity-encoded values
1210 * and returns them translated into 8-bit strings so we can run
1211 * checks on them.
8bd0068d 1212 *
0493ed11 1213 * @param $attvalue A string to run entity check against.
1214 * @return Nothing, modifies a reference value.
8bd0068d 1215 */
0493ed11 1216function sq_defang(&$attvalue){
1217 $me = 'sq_defang';
2dd879b8 1218 /**
0493ed11 1219 * Skip this if there aren't ampersands or backslashes.
8bd0068d 1220 */
0493ed11 1221 if (strpos($attvalue, '&') === false
1222 && strpos($attvalue, '\\') === false){
1223 return;
2dd879b8 1224 }
0493ed11 1225 $m = false;
2b665f28 1226 // before deent, translate the dangerous unicode characters and ... to safe values
1227 // otherwise the regular expressions do not match.
1228
1229
1230
0493ed11 1231 do {
1232 $m = false;
1233 $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1234 $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1235 $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1236 } while ($m == true);
1237 $attvalue = stripslashes($attvalue);
2dd879b8 1238}
1239
1240/**
8bd0068d 1241 * Kill any tabs, newlines, or carriage returns. Our friends the
1242 * makers of the browser with 95% market value decided that it'd
1243 * be funny to make "java[tab]script" be just as good as "javascript".
1244 *
1245 * @param attvalue The attribute value before extraneous spaces removed.
0493ed11 1246 * @return attvalue Nothing, modifies a reference value.
8bd0068d 1247 */
0493ed11 1248function sq_unspace(&$attvalue){
1249 $me = 'sq_unspace';
1250 if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1251 $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1252 Array('', '', '', '', ''), $attvalue);
2dd879b8 1253 }
2dd879b8 1254}
1255
2b665f28 1256/**
88de4926 1257 * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
2b665f28 1258 * IE as regular characters.
1259 *
1260 * @param attvalue The attribute value before dangerous characters are translated.
1261 * @return attvalue Nothing, modifies a reference value.
1262 * @author Marc Groot Koerkamp.
1263 */
1264function sq_fixIE_idiocy(&$attvalue) {
1265 // remove NUL
1266 $attvalue = str_replace("\0", "", $attvalue);
1267 // remove comments
1268 $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1269
88de4926 1270 // IE has the evil habit of accepting every possible value for the attribute expression.
1271 // The table below contains characters which are parsed by IE if they are used in the "expression"
2b665f28 1272 // attribute value.
1273 $aDangerousCharsReplacementTable = array(
1274 array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1275 '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1276 '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
567dc524 1277 '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1278 '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
2b665f28 1279 '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1280 '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1281 '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1282 '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1283 '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1284 '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1285 '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1286 '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1287 '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1288 '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1289 '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1290 '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1291 '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1292 '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1293 '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1294 '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1295 '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1296 '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1297 '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
567dc524 1298 "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range
1299 "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1300 "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1301 "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1302 "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1303 "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1304 "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1305 "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1306 "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1307 "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1308 "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1309 "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1310 "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1311 "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1312 "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1313 "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1314 "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1315 "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1316 "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1317 "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1318 "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1319 "\xCA\x9F", /* L UNICODE IPA Extension */
1320 "\xCA\x80", /* R UNICODE IPA Extension */
1321 "\xC9\xB4"), /* N UNICODE IPA Extension */
2b665f28 1322 array('l', 'l', 'r','r','n','n',
567dc524 1323 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1324 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1325 'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
2b665f28 1326 $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1327
88de4926 1328 // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1329 // used for XSS.
2b665f28 1330 $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1331}
1332
691a2d25 1333/**
8bd0068d 1334 * This function returns the final tag out of the tag name, an array
1335 * of attributes, and the type of the tag. This function is called by
1336 * sq_sanitize internally.
1337 *
1338 * @param $tagname the name of the tag.
1339 * @param $attary the array of attributes and their values
1340 * @param $tagtype The type of the tag (see in comments).
1341 * @return a string with the final tag representation.
1342 */
691a2d25 1343function sq_tagprint($tagname, $attary, $tagtype){
b583c3e8 1344 $me = 'sq_tagprint';
3d8371be 1345
691a2d25 1346 if ($tagtype == 2){
1347 $fulltag = '</' . $tagname . '>';
1348 } else {
1349 $fulltag = '<' . $tagname;
1350 if (is_array($attary) && sizeof($attary)){
1351 $atts = Array();
1352 while (list($attname, $attvalue) = each($attary)){
1353 array_push($atts, "$attname=$attvalue");
1354 }
1355 $fulltag .= ' ' . join(" ", $atts);
1356 }
1357 if ($tagtype == 3){
b583c3e8 1358 $fulltag .= ' /';
691a2d25 1359 }
b583c3e8 1360 $fulltag .= '>';
451f74a2 1361 }
691a2d25 1362 return $fulltag;
451f74a2 1363}
a3daaaf3 1364
691a2d25 1365/**
8bd0068d 1366 * A small helper function to use with array_walk. Modifies a by-ref
1367 * value and makes it lowercase.
1368 *
1369 * @param $val a value passed by-ref.
1370 * @return void since it modifies a by-ref value.
1371 */
691a2d25 1372function sq_casenormalize(&$val){
1373 $val = strtolower($val);
1374}
451f74a2 1375
691a2d25 1376/**
8bd0068d 1377 * This function skips any whitespace from the current position within
1378 * a string and to the next non-whitespace value.
1379 *
1380 * @param $body the string
1381 * @param $offset the offset within the string where we should start
1382 * looking for the next non-whitespace character.
1383 * @return the location within the $body where the next
1384 * non-whitespace char is located.
1385 */
691a2d25 1386function sq_skipspace($body, $offset){
b583c3e8 1387 $me = 'sq_skipspace';
3d8371be 1388 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
691a2d25 1389 if (sizeof($matches{1})){
1390 $count = strlen($matches{1});
1391 $offset += $count;
451f74a2 1392 }
691a2d25 1393 return $offset;
451f74a2 1394}
a3daaaf3 1395
691a2d25 1396/**
8bd0068d 1397 * This function looks for the next character within a string. It's
1398 * really just a glorified "strpos", except it catches if failures
1399 * nicely.
1400 *
1401 * @param $body The string to look for needle in.
1402 * @param $offset Start looking from this position.
1403 * @param $needle The character/string to look for.
1404 * @return location of the next occurance of the needle, or
1405 * strlen($body) if needle wasn't found.
1406 */
691a2d25 1407function sq_findnxstr($body, $offset, $needle){
3d8371be 1408 $me = 'sq_findnxstr';
691a2d25 1409 $pos = strpos($body, $needle, $offset);
1410 if ($pos === FALSE){
1411 $pos = strlen($body);
451f74a2 1412 }
691a2d25 1413 return $pos;
451f74a2 1414}
a3daaaf3 1415
691a2d25 1416/**
8bd0068d 1417 * This function takes a PCRE-style regexp and tries to match it
1418 * within the string.
1419 *
1420 * @param $body The string to look for needle in.
1421 * @param $offset Start looking from here.
1422 * @param $reg A PCRE-style regex to match.
1423 * @return Returns a false if no matches found, or an array
1424 * with the following members:
1425 * - integer with the location of the match within $body
1426 * - string with whatever content between offset and the match
1427 * - string with whatever it is we matched
1428 */
691a2d25 1429function sq_findnxreg($body, $offset, $reg){
b583c3e8 1430 $me = 'sq_findnxreg';
691a2d25 1431 $matches = Array();
1432 $retarr = Array();
7d06541f 1433 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1434 if (!isset($matches{0}) || !$matches{0}){
691a2d25 1435 $retarr = false;
1436 } else {
1437 $retarr{0} = $offset + strlen($matches{1});
1438 $retarr{1} = $matches{1};
1439 $retarr{2} = $matches{2};
1440 }
1441 return $retarr;
1442}
a3daaaf3 1443
691a2d25 1444/**
8bd0068d 1445 * This function looks for the next tag.
1446 *
1447 * @param $body String where to look for the next tag.
1448 * @param $offset Start looking from here.
1449 * @return false if no more tags exist in the body, or
1450 * an array with the following members:
1451 * - string with the name of the tag
1452 * - array with attributes and their values
1453 * - integer with tag type (1, 2, or 3)
1454 * - integer where the tag starts (starting "<")
1455 * - integer where the tag ends (ending ">")
1456 * first three members will be false, if the tag is invalid.
1457 */
691a2d25 1458function sq_getnxtag($body, $offset){
b583c3e8 1459 $me = 'sq_getnxtag';
691a2d25 1460 if ($offset > strlen($body)){
1461 return false;
1462 }
1463 $lt = sq_findnxstr($body, $offset, "<");
1464 if ($lt == strlen($body)){
1465 return false;
1466 }
1467 /**
8bd0068d 1468 * We are here:
1469 * blah blah <tag attribute="value">
1470 * \---------^
1471 */
691a2d25 1472 $pos = sq_skipspace($body, $lt+1);
1473 if ($pos >= strlen($body)){
1474 return Array(false, false, false, $lt, strlen($body));
1475 }
1476 /**
8bd0068d 1477 * There are 3 kinds of tags:
1478 * 1. Opening tag, e.g.:
1479 * <a href="blah">
1480 * 2. Closing tag, e.g.:
1481 * </a>
1482 * 3. XHTML-style content-less tag, e.g.:
1483 * <img src="blah" />
1484 */
691a2d25 1485 $tagtype = false;
1486 switch (substr($body, $pos, 1)){
3d8371be 1487 case '/':
1488 $tagtype = 2;
1489 $pos++;
1490 break;
1491 case '!':
1492 /**
8bd0068d 1493 * A comment or an SGML declaration.
1494 */
3d8371be 1495 if (substr($body, $pos+1, 2) == "--"){
1496 $gt = strpos($body, "-->", $pos);
1497 if ($gt === false){
1498 $gt = strlen($body);
1499 } else {
1500 $gt += 2;
1501 }
1502 return Array(false, false, false, $lt, $gt);
bb8d0799 1503 } else {
3d8371be 1504 $gt = sq_findnxstr($body, $pos, ">");
1505 return Array(false, false, false, $lt, $gt);
1506 }
1507 break;
1508 default:
1509 /**
8bd0068d 1510 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1511 * later.
1512 */
3d8371be 1513 $tagtype = 1;
1514 break;
691a2d25 1515 }
a3daaaf3 1516
0493ed11 1517 $tag_start = $pos;
691a2d25 1518 $tagname = '';
1519 /**
8bd0068d 1520 * Look for next [\W-_], which will indicate the end of the tag name.
1521 */
691a2d25 1522 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1523 if ($regary == false){
1524 return Array(false, false, false, $lt, strlen($body));
1525 }
1526 list($pos, $tagname, $match) = $regary;
1527 $tagname = strtolower($tagname);
1528
1529 /**
8bd0068d 1530 * $match can be either of these:
1531 * '>' indicating the end of the tag entirely.
1532 * '\s' indicating the end of the tag name.
1533 * '/' indicating that this is type-3 xhtml tag.
1534 *
1535 * Whatever else we find there indicates an invalid tag.
1536 */
691a2d25 1537 switch ($match){
3d8371be 1538 case '/':
691a2d25 1539 /**
8bd0068d 1540 * This is an xhtml-style tag with a closing / at the
1541 * end, like so: <img src="blah" />. Check if it's followed
1542 * by the closing bracket. If not, then this tag is invalid
1543 */
3d8371be 1544 if (substr($body, $pos, 2) == "/>"){
1545 $pos++;
1546 $tagtype = 3;
1547 } else {
1548 $gt = sq_findnxstr($body, $pos, ">");
1549 $retary = Array(false, false, false, $lt, $gt);
1550 return $retary;
1551 }
1552 case '>':
1553 return Array($tagname, false, $tagtype, $lt, $pos);
1554 break;
1555 default:
1556 /**
8bd0068d 1557 * Check if it's whitespace
1558 */
3d8371be 1559 if (!preg_match('/\s/', $match)){
1560 /**
8bd0068d 1561 * This is an invalid tag! Look for the next closing ">".
1562 */
7d06541f 1563 $gt = sq_findnxstr($body, $lt, ">");
3d8371be 1564 return Array(false, false, false, $lt, $gt);
1565 }
1566 break;
691a2d25 1567 }
3d8371be 1568
691a2d25 1569 /**
8bd0068d 1570 * At this point we're here:
1571 * <tagname attribute='blah'>
1572 * \-------^
1573 *
1574 * At this point we loop in order to find all attributes.
1575 */
691a2d25 1576 $attname = '';
0493ed11 1577 $atttype = false;
691a2d25 1578 $attary = Array();
1579
1580 while ($pos <= strlen($body)){
1581 $pos = sq_skipspace($body, $pos);
1582 if ($pos == strlen($body)){
1583 /**
8bd0068d 1584 * Non-closed tag.
1585 */
691a2d25 1586 return Array(false, false, false, $lt, $pos);
1587 }
1588 /**
8bd0068d 1589 * See if we arrived at a ">" or "/>", which means that we reached
1590 * the end of the tag.
1591 */
691a2d25 1592 $matches = Array();
164800ad 1593 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
c828931c 1594 /**
8bd0068d 1595 * Yep. So we did.
1596 */
c828931c 1597 $pos += strlen($matches{1});
1598 if ($matches{2} == "/>"){
1599 $tagtype = 3;
1600 $pos++;
1601 }
1602 return Array($tagname, $attary, $tagtype, $lt, $pos);
1603 }
a3daaaf3 1604
cca46357 1605 /**
8bd0068d 1606 * There are several types of attributes, with optional
1607 * [:space:] between members.
1608 * Type 1:
1609 * attrname[:space:]=[:space:]'CDATA'
1610 * Type 2:
1611 * attrname[:space:]=[:space:]"CDATA"
1612 * Type 3:
1613 * attr[:space:]=[:space:]CDATA
1614 * Type 4:
1615 * attrname
1616 *
1617 * We leave types 1 and 2 the same, type 3 we check for
1618 * '"' and convert to "&quot" if needed, then wrap in
1619 * double quotes. Type 4 we convert into:
1620 * attrname="yes".
1621 */
3f7c623f 1622 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
691a2d25 1623 if ($regary == false){
1624 /**
8bd0068d 1625 * Looks like body ended before the end of tag.
1626 */
691a2d25 1627 return Array(false, false, false, $lt, strlen($body));
cca46357 1628 }
691a2d25 1629 list($pos, $attname, $match) = $regary;
1630 $attname = strtolower($attname);
1631 /**
8bd0068d 1632 * We arrived at the end of attribute name. Several things possible
1633 * here:
1634 * '>' means the end of the tag and this is attribute type 4
1635 * '/' if followed by '>' means the same thing as above
1636 * '\s' means a lot of things -- look what it's followed by.
1637 * anything else means the attribute is invalid.
1638 */
691a2d25 1639 switch($match){
3d8371be 1640 case '/':
691a2d25 1641 /**
8bd0068d 1642 * This is an xhtml-style tag with a closing / at the
1643 * end, like so: <img src="blah" />. Check if it's followed
1644 * by the closing bracket. If not, then this tag is invalid
1645 */
3d8371be 1646 if (substr($body, $pos, 2) == "/>"){
691a2d25 1647 $pos++;
3d8371be 1648 $tagtype = 3;
691a2d25 1649 } else {
3d8371be 1650 $gt = sq_findnxstr($body, $pos, ">");
1651 $retary = Array(false, false, false, $lt, $gt);
1652 return $retary;
1653 }
1654 case '>':
1655 $attary{$attname} = '"yes"';
1656 return Array($tagname, $attary, $tagtype, $lt, $pos);
1657 break;
1658 default:
1659 /**
8bd0068d 1660 * Skip whitespace and see what we arrive at.
1661 */
3d8371be 1662 $pos = sq_skipspace($body, $pos);
1663 $char = substr($body, $pos, 1);
1664 /**
8bd0068d 1665 * Two things are valid here:
1666 * '=' means this is attribute type 1 2 or 3.
1667 * \w means this was attribute type 4.
1668 * anything else we ignore and re-loop. End of tag and
1669 * invalid stuff will be caught by our checks at the beginning
1670 * of the loop.
1671 */
3d8371be 1672 if ($char == "="){
1673 $pos++;
1674 $pos = sq_skipspace($body, $pos);
691a2d25 1675 /**
8bd0068d 1676 * Here are 3 possibilities:
1677 * "'" attribute type 1
1678 * '"' attribute type 2
1679 * everything else is the content of tag type 3
1680 */
3d8371be 1681 $quot = substr($body, $pos, 1);
1682 if ($quot == "'"){
1683 $regary = sq_findnxreg($body, $pos+1, "\'");
1684 if ($regary == false){
1685 return Array(false, false, false, $lt, strlen($body));
1686 }
1687 list($pos, $attval, $match) = $regary;
1688 $pos++;
1689 $attary{$attname} = "'" . $attval . "'";
1690 } else if ($quot == '"'){
1691 $regary = sq_findnxreg($body, $pos+1, '\"');
1692 if ($regary == false){
1693 return Array(false, false, false, $lt, strlen($body));
1694 }
1695 list($pos, $attval, $match) = $regary;
1696 $pos++;
1697 $attary{$attname} = '"' . $attval . '"';
1698 } else {
1699 /**
8bd0068d 1700 * These are hateful. Look for \s, or >.
1701 */
3d8371be 1702 $regary = sq_findnxreg($body, $pos, "[\s>]");
1703 if ($regary == false){
1704 return Array(false, false, false, $lt, strlen($body));
1705 }
1706 list($pos, $attval, $match) = $regary;
1707 /**
8bd0068d 1708 * If it's ">" it will be caught at the top.
1709 */
3d8371be 1710 $attval = preg_replace("/\"/s", "&quot;", $attval);
1711 $attary{$attname} = '"' . $attval . '"';
7e235a1a 1712 }
3d8371be 1713 } else if (preg_match("|[\w/>]|", $char)) {
691a2d25 1714 /**
8bd0068d 1715 * That was attribute type 4.
1716 */
3d8371be 1717 $attary{$attname} = '"yes"';
1718 } else {
1719 /**
8bd0068d 1720 * An illegal character. Find next '>' and return.
1721 */
3d8371be 1722 $gt = sq_findnxstr($body, $pos, ">");
1723 return Array(false, false, false, $lt, $gt);
451f74a2 1724 }
3d8371be 1725 break;
691a2d25 1726 }
1727 }
1728 /**
8bd0068d 1729 * The fact that we got here indicates that the tag end was never
1730 * found. Return invalid tag indication so it gets stripped.
1731 */
691a2d25 1732 return Array(false, false, false, $lt, strlen($body));
1733}
1734
1735/**
0493ed11 1736 * Translates entities into literal values so they can be checked.
8bd0068d 1737 *
0493ed11 1738 * @param $attvalue the by-ref value to check.
1739 * @param $regex the regular expression to check against.
1740 * @param $hex whether the entites are hexadecimal.
1741 * @return True or False depending on whether there were matches.
8bd0068d 1742 */
0493ed11 1743function sq_deent(&$attvalue, $regex, $hex=false){
b583c3e8 1744 $me = 'sq_deent';
0493ed11 1745 $ret_match = false;
2b665f28 1746 // remove comments
1747 //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
0493ed11 1748 preg_match_all($regex, $attvalue, $matches);
1749 if (is_array($matches) && sizeof($matches[0]) > 0){
1750 $repl = Array();
1751 for ($i = 0; $i < sizeof($matches[0]); $i++){
1752 $numval = $matches[1][$i];
1753 if ($hex){
1754 $numval = hexdec($numval);
a3daaaf3 1755 }
0493ed11 1756 $repl{$matches[0][$i]} = chr($numval);
691a2d25 1757 }
0493ed11 1758 $attvalue = strtr($attvalue, $repl);
1759 return true;
1760 } else {
1761 return false;
691a2d25 1762 }
691a2d25 1763}
1764
1765/**
8bd0068d 1766 * This function runs various checks against the attributes.
1767 *
1768 * @param $tagname String with the name of the tag.
1769 * @param $attary Array with all tag attributes.
1770 * @param $rm_attnames See description for sq_sanitize
1771 * @param $bad_attvals See description for sq_sanitize
1772 * @param $add_attr_to_tag See description for sq_sanitize
1773 * @param $message message object
1774 * @param $id message id
1775 * @return Array with modified attributes.
1776 */
da2415c1 1777function sq_fixatts($tagname,
1778 $attary,
691a2d25 1779 $rm_attnames,
1780 $bad_attvals,
1781 $add_attr_to_tag,
1782 $message,
b3af12ef 1783 $id,
3d8371be 1784 $mailbox
691a2d25 1785 ){
b583c3e8 1786 $me = 'sq_fixatts';
691a2d25 1787 while (list($attname, $attvalue) = each($attary)){
1788 /**
8bd0068d 1789 * See if this attribute should be removed.
1790 */
691a2d25 1791 foreach ($rm_attnames as $matchtag=>$matchattrs){
1792 if (preg_match($matchtag, $tagname)){
1793 foreach ($matchattrs as $matchattr){
1794 if (preg_match($matchattr, $attname)){
1795 unset($attary{$attname});
1796 continue;
1797 }
451f74a2 1798 }
451f74a2 1799 }
691a2d25 1800 }
2b665f28 1801 /**
1802 * Workaround for IE quirks
1803 */
1804 sq_fixIE_idiocy($attvalue);
1805
691a2d25 1806 /**
8bd0068d 1807 * Remove any backslashes, entities, and extraneous whitespace.
1808 */
2b665f28 1809
1810 $oldattvalue = $attvalue;
0493ed11 1811 sq_defang($attvalue);
2b665f28 1812 if ($attname == 'style' && $attvalue !== $oldattvalue) {
1813 // entities are used in the attribute value. In 99% of the cases it's there as XSS
1814 // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1815 $attvalue = "idiocy";
1816 $attary{$attname} = $attvalue;
1817 }
0493ed11 1818 sq_unspace($attvalue);
af861a34 1819
691a2d25 1820 /**
8bd0068d 1821 * Now let's run checks on the attvalues.
1822 * I don't expect anyone to comprehend this. If you do,
1823 * get in touch with me so I can drive to where you live and
1824 * shake your hand personally. :)
1825 */
691a2d25 1826 foreach ($bad_attvals as $matchtag=>$matchattrs){
1827 if (preg_match($matchtag, $tagname)){
1828 foreach ($matchattrs as $matchattr=>$valary){
1829 if (preg_match($matchattr, $attname)){
1830 /**
8bd0068d 1831 * There are two arrays in valary.
1832 * First is matches.
1833 * Second one is replacements
1834 */
691a2d25 1835 list($valmatch, $valrepl) = $valary;
da2415c1 1836 $newvalue =
691a2d25 1837 preg_replace($valmatch, $valrepl, $attvalue);
1838 if ($newvalue != $attvalue){
1839 $attary{$attname} = $newvalue;
567dc524 1840 $attvalue = $newvalue;
691a2d25 1841 }
1842 }
1843 }
451f74a2 1844 }
a3daaaf3 1845 }
567dc524 1846 if ($attname == 'style') {
1847 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1848 // 8bit and control characters in style attribute values can be used for XSS, remove them
1849 $attary{$attname} = '"disallowed character"';
1850 }
1851 preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1852 if (count($aMatch)) {
1853 foreach($aMatch[1] as $sMatch) {
1854 // url value
1855 $urlvalue = $sMatch;
1856 sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1857 $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1858 }
1859 }
691a2d25 1860 }
ff940ebc 1861 /**
567dc524 1862 * Use white list based filtering on attributes which can contain url's
ff940ebc 1863 */
567dc524 1864 else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
1865 sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1866 $attary{$attname} = $attvalue;
ff940ebc 1867 }
a3daaaf3 1868 }
691a2d25 1869 /**
8bd0068d 1870 * See if we need to append any attributes to this tag.
1871 */
691a2d25 1872 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1873 if (preg_match($matchtag, $tagname)){
1874 $attary = array_merge($attary, $addattary);
1875 }
1876 }
1877 return $attary;
451f74a2 1878}
a3daaaf3 1879
567dc524 1880/**
1881 * This function filters url's
1882 *
1883 * @param $attvalue String with attribute value to filter
1884 * @param $message message object
1885 * @param $id message id
1886 * @param $mailbox mailbox
1887 * @param $sQuote quoting characters around url's
1888 */
1889function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1890 $attvalue = trim($attvalue);
1891 if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1892 // remove the double quotes
1893 $sQuote = $attvalue[0];
1894 $attvalue = trim(substr($attvalue,1,-1));
1895 }
1896
d31f73f1 1897 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
1898 // images off by default.
afbf184c 1899 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
d31f73f1 1900
567dc524 1901 $secremoveimg = '../images/' . _("sec_remove_eng.png");
1902
1903 /**
1904 * Replace empty src tags with the blank image. src is only used
1905 * for frames, images, and image inputs. Doing a replace should
1906 * not affect them working as should be, however it will stop
1907 * IE from being kicked off when src for img tags are not set
1908 */
1909 if ($attvalue == '') {
1910 $attvalue = '"' . SM_PATH . 'images/blank.png"';
1911 } else {
1912 // first, disallow 8 bit characters and control characters
1913 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1914 switch ($attname) {
1915 case 'href':
1916 $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1917 break;
1918 default:
1919 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1920 break;
1921 }
1922 } else {
1923 $aUrl = parse_url($attvalue);
1924 if (isset($aUrl['scheme'])) {
1925 switch(strtolower($aUrl['scheme'])) {
d75e755b 1926 case 'mailto':
567dc524 1927 case 'http':
1928 case 'https':
1929 case 'ftp':
1930 if ($attname != 'href') {
1931 if ($view_unsafe_images == false) {
1932 $attvalue = $sQuote . $secremoveimg . $sQuote;
1933 } else {
1934 if (isset($aUrl['path'])) {
8bbbc757 1935
1936 // No one has been able to show that image URIs
1937 // can be exploited, so for now, no restrictions
1938 // are made at all. If this proves to be a problem,
1939 // the commented-out code below can be of help.
1940 // (One consideration is that I see nothing in this
1941 // function that specifically says that we will
1942 // only ever arrive here when inspecting an image
1943 // tag, although that does seem to be the end
1944 // result - e.g., <script src="..."> where malicious
1945 // image URIs are in fact a problem are already
1946 // filtered out elsewhere.
1947 /* ---------------------------------
567dc524 1948 // validate image extension.
1949 $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1950 if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
8bbbc757 1951 // If URI is to something other than
1952 // a regular image file, get the contents
1953 // and try to see if it is an image.
1954 // Don't use Fileinfo (finfo_file()) because
1955 // we'd need to make the admin configure the
1956 // location of the magic.mime file (FIXME: add finfo_file() support later?)
1957 //
1958 $mime_type = '';
1959 if (function_exists('mime_content_type')
1960 && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
1961
1962 // fetch file
1963 //
1964 $file_contents = '';
1965 while (!feof($FILE)) {
1966 $file_contents .= fread($FILE, 8192);
1967 }
1968 fclose($FILE);
1969
1970 // store file locally
1971 //
1972 global $attachment_dir, $username;
1973 $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
1974 $localfilename = GenerateRandomString(32, '', 7);
1975 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1976 while (file_exists($full_localfilename)) {
1977 $localfilename = GenerateRandomString(32, '', 7);
1978 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1979 }
1980 $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
1981 fwrite($FILE, $file_contents);
1982 fclose($FILE);
1983
1984 // get mime type and remove file
1985 //
1986 $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
1987 unlink("$hashed_attachment_dir/$localfilename");
1988 }
1989 // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
1990 if (substr(strtolower($mime_type), 0, 5) != 'image') {
1991 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1992 }
567dc524 1993 }
8bbbc757 1994 --------------------------------- */
567dc524 1995 } else {
1996 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1997 }
1998 }
cf088f55 1999 } else {
2000 $attvalue = $sQuote . $attvalue . $sQuote;
567dc524 2001 }
2002 break;
2003 case 'outbind':
2004 /**
2005 * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
2006 * One day MS might actually make it match something useful, for now, falling
2007 * back to using cid2http, so we can grab the blank.png.
2008 */
cf088f55 2009 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 2010 break;
2011 case 'cid':
2012 /**
2013 * Turn cid: urls into http-friendly ones.
2014 */
cf088f55 2015 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 2016 break;
2017 default:
2018 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2019 break;
2020 }
2021 } else {
b1fbb25f 2022 if (!isset($aUrl['path']) || $aUrl['path'] != $secremoveimg) {
567dc524 2023 // parse_url did not lead to satisfying result
2024 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2025 }
2026 }
2027 }
2028 }
2029}
2030
691a2d25 2031/**
8bd0068d 2032 * This function edits the style definition to make them friendly and
2033 * usable in SquirrelMail.
2034 *
2035 * @param $message the message object
2036 * @param $id the message id
2037 * @param $content a string with whatever is between <style> and </style>
2038 * @param $mailbox the message mailbox
2039 * @return a string with edited content.
2040 */
e60a299a 2041function sq_fixstyle($body, $pos, $message, $id, $mailbox){
b583c3e8 2042 $me = 'sq_fixstyle';
7e2ff844 2043 // workaround for </style> in between comments
2044 $iCurrentPos = $pos;
2045 $content = '';
2046 $sToken = '';
2047 $bSucces = false;
2048 $bEndTag = false;
2049 for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
2050 $char = $body{$i};
2051 switch ($char) {
2052 case '<':
10c0caeb 2053 $sToken = $char;
7e2ff844 2054 break;
2055 case '/':
2056 if ($sToken == '<') {
2057 $sToken .= $char;
2058 $bEndTag = true;
2059 } else {
2060 $content .= $char;
2061 }
2062 break;
2063 case '>':
2064 if ($bEndTag) {
2065 $sToken .= $char;
2066 if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
2067 $newpos = $i + 1;
2068 $bSucces = true;
2069 break 2;
2070 } else {
2071 $content .= $sToken;
2072 }
2073 $bEndTag = false;
2074 } else {
2075 $content .= $char;
2076 }
2077 break;
2078 case '!':
2079 if ($sToken == '<') {
2080 // possible comment
2081 if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
2082 $i = strpos($body,'-->',$i+3);
2b665f28 2083 if ($i === false) { // no end comment
2084 $i = strlen($body);
2085 }
7e2ff844 2086 $sToken = '';
2087 }
2088 } else {
2089 $content .= $char;
2090 }
2091 break;
2092 default:
2093 if ($bEndTag) {
2094 $sToken .= $char;
2095 } else {
2096 $content .= $char;
2097 }
2098 break;
2099 }
2100 }
2101 if ($bSucces == FALSE){
7d06541f 2102 return array(FALSE, strlen($body));
2103 }
7e2ff844 2104
2b665f28 2105
2106
691a2d25 2107 /**
9ebace19 2108 * First look for general BODY style declaration, which would be
2109 * like so:
2110 * body {background: blah-blah}
2111 * and change it to .bodyclass so we can just assign it to a <div>
2112 */
691a2d25 2113 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
3d8371be 2114 $secremoveimg = '../images/' . _("sec_remove_eng.png");
691a2d25 2115 /**
0493ed11 2116 * Fix url('blah') declarations.
2117 */
2118 // $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
2119 // "url(\\1$secremoveimg\\2)", $content);
2b665f28 2120
567dc524 2121 // first check for 8bit sequences and disallowed control characters
2122 if (preg_match('/[\16-\37\200-\377]+/',$content)) {
2123 $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
2124 return array($content, $newpos);
2125 }
2126
2b665f28 2127 // IE Sucks hard. We have a special function for it.
2128 sq_fixIE_idiocy($content);
2129
2130 // remove @import line
2131 $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2132
5b4884be 2133 // translate ur\l and variations (IE parses that)
2b665f28 2134 // TODO check if the sq_fixIE_idiocy function already handles this.
5b4884be 2135 $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
567dc524 2136 preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2137 if (count($aMatch)) {
2138 $aValue = $aReplace = array();
2139 foreach($aMatch[1] as $sMatch) {
2140 // url value
2141 $urlvalue = $sMatch;
2142 sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2143 $aValue[] = $sMatch;
2144 $aReplace[] = $urlvalue;
0493ed11 2145 }
567dc524 2146 $content = str_replace($aValue,$aReplace,$content);
691a2d25 2147 }
567dc524 2148
9ebace19 2149 /**
2150 * Remove any backslashes, entities, and extraneous whitespace.
2151 */
0493ed11 2152 $contentTemp = $content;
2153 sq_defang($contentTemp);
2154 sq_unspace($contentTemp);
a3daaaf3 2155
691a2d25 2156 /**
8bd0068d 2157 * Fix stupid css declarations which lead to vulnerabilities
2158 * in IE.
39352565 2159 *
2160 * Also remove "position" attribute, as it can easily be set
2161 * to "fixed" or "absolute" with "left" and "top" attributes
2162 * of zero, taking over the whole content frame. It can also
2163 * be set to relative and move itself anywhere it wants to,
2164 * displaying content in areas it shouldn't be allowed to touch.
8bd0068d 2165 */
5db90261 2166 $match = Array('/\/\*.*\*\//',
2167 '/expression/i',
0493ed11 2168 '/behaviou*r/i',
2169 '/binding/i',
2b665f28 2170 '/include-source/i',
2171 '/javascript/i',
39352565 2172 '/script/i',
2173 '/position/i');
2174 $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
0493ed11 2175 $contentNew = preg_replace($match, $replace, $contentTemp);
2176 if ($contentNew !== $contentTemp) {
2177 // insecure css declarations are used. From now on we don't care
2178 // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2179 $content = $contentNew;
2180 }
7d06541f 2181 return array($content, $newpos);
691a2d25 2182}
a3daaaf3 2183
0493ed11 2184
691a2d25 2185/**
8bd0068d 2186 * This function converts cid: url's into the ones that can be viewed in
2187 * the browser.
2188 *
2189 * @param $message the message object
2190 * @param $id the message id
2191 * @param $cidurl the cid: url.
2192 * @param $mailbox the message mailbox
2193 * @return a string with a http-friendly url
2194 */
b3af12ef 2195function sq_cid2http($message, $id, $cidurl, $mailbox){
691a2d25 2196 /**
8bd0068d 2197 * Get rid of quotes.
2198 */
691a2d25 2199 $quotchar = substr($cidurl, 0, 1);
2dd879b8 2200 if ($quotchar == '"' || $quotchar == "'"){
2201 $cidurl = str_replace($quotchar, "", $cidurl);
2202 } else {
2203 $quotchar = '';
2204 }
691a2d25 2205 $cidurl = substr(trim($cidurl), 4);
0493ed11 2206
2207 $match_str = '/\{.*?\}\//';
2208 $str_rep = '';
2209 $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2210
e5e9381a 2211 $linkurl = find_ent_id($cidurl, $message);
9ebace19 2212 /* in case of non-safe cid links $httpurl should be replaced by a sort of
2213 unsafe link image */
e5e9381a 2214 $httpurl = '';
c8f5f606 2215
8bd0068d 2216 /**
2217 * This is part of a fix for Outlook Express 6.x generating
2218 * cid URLs without creating content-id headers. These images are
2219 * not part of the multipart/related html mail. The html contains
2220 * <img src="cid:{some_id}/image_filename.ext"> references to
2221 * attached images with as goal to render them inline although
2222 * the attachment disposition property is not inline.
2223 */
c8f5f606 2224
2225 if (empty($linkurl)) {
2226 if (preg_match('/{.*}\//', $cidurl)) {
2227 $cidurl = preg_replace('/{.*}\//','', $cidurl);
2228 if (!empty($cidurl)) {
2229 $linkurl = find_ent_id($cidurl, $message);
2230 }
2231 }
2232 }
f8a1ed5a 2233
c8f5f606 2234 if (!empty($linkurl)) {
fa26ab45 2235 $httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&amp;' .
8bd0068d 2236 "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2237 '&amp;ent_id=' . $linkurl . $quotchar;
c8f5f606 2238 } else {
2239 /**
2240 * If we couldn't generate a proper img url, drop in a blank image
2241 * instead of sending back empty, otherwise it causes unusual behaviour
2242 */
bc017c1d 2243 $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
e5e9381a 2244 }
f8a1ed5a 2245
691a2d25 2246 return $httpurl;
2247}
2248
2249/**
8bd0068d 2250 * This function changes the <body> tag into a <div> tag since we
2251 * can't really have a body-within-body.
2252 *
2253 * @param $attary an array of attributes and values of <body>
2254 * @param $mailbox mailbox we're currently reading (for cid2http)
2255 * @param $message current message (for cid2http)
2256 * @param $id current message id (for cid2http)
2257 * @return a modified array of attributes to be set for <div>
2258 */
2dd879b8 2259function sq_body2div($attary, $mailbox, $message, $id){
b583c3e8 2260 $me = 'sq_body2div';
3d8371be 2261 $divattary = Array('class' => "'bodyclass'");
b583c3e8 2262 $text = '#000000';
c189a963 2263 $has_bgc_stl = $has_txt_stl = false;
b583c3e8 2264 $styledef = '';
691a2d25 2265 if (is_array($attary) && sizeof($attary) > 0){
2266 foreach ($attary as $attname=>$attvalue){
2267 $quotchar = substr($attvalue, 0, 1);
2268 $attvalue = str_replace($quotchar, "", $attvalue);
2269 switch ($attname){
3d8371be 2270 case 'background':
8bd0068d 2271 $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
3d8371be 2272 $styledef .= "background-image: url('$attvalue'); ";
2273 break;
2274 case 'bgcolor':
c189a963 2275 $has_bgc_stl = true;
3d8371be 2276 $styledef .= "background-color: $attvalue; ";
2277 break;
2278 case 'text':
c189a963 2279 $has_txt_stl = true;
3d8371be 2280 $styledef .= "color: $attvalue; ";
2281 break;
691a2d25 2282 }
a3daaaf3 2283 }
c189a963 2284 // Outlook defines a white bgcolor and no text color. This can lead to
2285 // white text on a white bg with certain themes.
2286 if ($has_bgc_stl && !$has_txt_stl) {
2287 $styledef .= "color: $text; ";
2288 }
691a2d25 2289 if (strlen($styledef) > 0){
2290 $divattary{"style"} = "\"$styledef\"";
2291 }
2292 }
2293 return $divattary;
2294}
a3daaaf3 2295
691a2d25 2296/**
8bd0068d 2297 * This is the main function and the one you should actually be calling.
2298 * There are several variables you should be aware of an which need
2299 * special description.
2300 *
2301 * Since the description is quite lengthy, see it here:
2302 * http://linux.duke.edu/projects/mini/htmlfilter/
2303 *
2304 * @param $body the string with HTML you wish to filter
2305 * @param $tag_list see description above
2306 * @param $rm_tags_with_content see description above
2307 * @param $self_closing_tags see description above
2308 * @param $force_tag_closing see description above
2309 * @param $rm_attnames see description above
2310 * @param $bad_attvals see description above
2311 * @param $add_attr_to_tag see description above
2312 * @param $message message object
2313 * @param $id message id
2314 * @return sanitized html safe to show on your pages.
2315 */
da2415c1 2316function sq_sanitize($body,
8bd0068d 2317 $tag_list,
2318 $rm_tags_with_content,
2319 $self_closing_tags,
2320 $force_tag_closing,
2321 $rm_attnames,
2322 $bad_attvals,
2323 $add_attr_to_tag,
2324 $message,
2325 $id,
2326 $mailbox
2327 ){
b583c3e8 2328 $me = 'sq_sanitize';
7d06541f 2329 $rm_tags = array_shift($tag_list);
691a2d25 2330 /**
8bd0068d 2331 * Normalize rm_tags and rm_tags_with_content.
2332 */
7d06541f 2333 @array_walk($tag_list, 'sq_casenormalize');
691a2d25 2334 @array_walk($rm_tags_with_content, 'sq_casenormalize');
2335 @array_walk($self_closing_tags, 'sq_casenormalize');
2336 /**
8bd0068d 2337 * See if tag_list is of tags to remove or tags to allow.
2338 * false means remove these tags
2339 * true means allow these tags
2340 */
691a2d25 2341 $curpos = 0;
2342 $open_tags = Array();
2dd879b8 2343 $trusted = "\n<!-- begin sanitized html -->\n";
691a2d25 2344 $skip_content = false;
bb8d0799 2345 /**
8bd0068d 2346 * Take care of netscape's stupid javascript entities like
2347 * &{alert('boo')};
2348 */
bb8d0799 2349 $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
691a2d25 2350
7d06541f 2351 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
691a2d25 2352 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
2353 $free_content = substr($body, $curpos, $lt-$curpos);
2354 /**
8bd0068d 2355 * Take care of <style>
2356 */
7d06541f 2357 if ($tagname == "style" && $tagtype == 1){
da2415c1 2358 list($free_content, $curpos) =
e60a299a 2359 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
7d06541f 2360 if ($free_content != FALSE){
1d398b1d 2361 if ( !empty($attary) ) {
2362 $attary = sq_fixatts($tagname,
2363 $attary,
2364 $rm_attnames,
2365 $bad_attvals,
2366 $add_attr_to_tag,
2367 $message,
2368 $id,
2369 $mailbox
2370 );
2371 }
7d06541f 2372 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2373 $trusted .= $free_content;
2374 $trusted .= sq_tagprint($tagname, false, 2);
2375 }
2376 continue;
691a2d25 2377 }
2378 if ($skip_content == false){
2379 $trusted .= $free_content;
691a2d25 2380 }
2381 if ($tagname != FALSE){
2382 if ($tagtype == 2){
2383 if ($skip_content == $tagname){
2384 /**
8bd0068d 2385 * Got to the end of tag we needed to remove.
2386 */
691a2d25 2387 $tagname = false;
2388 $skip_content = false;
2389 } else {
2390 if ($skip_content == false){
c828931c 2391 if ($tagname == "body"){
2392 $tagname = "div";
2dd879b8 2393 }
da2415c1 2394 if (isset($open_tags{$tagname}) &&
8bd0068d 2395 $open_tags{$tagname} > 0){
2dd879b8 2396 $open_tags{$tagname}--;
691a2d25 2397 } else {
2dd879b8 2398 $tagname = false;
691a2d25 2399 }
691a2d25 2400 }
2401 }
2402 } else {
2403 /**
8bd0068d 2404 * $rm_tags_with_content
2405 */
691a2d25 2406 if ($skip_content == false){
2407 /**
8bd0068d 2408 * See if this is a self-closing type and change
2409 * tagtype appropriately.
2410 */
691a2d25 2411 if ($tagtype == 1
8bd0068d 2412 && in_array($tagname, $self_closing_tags)){
2dd879b8 2413 $tagtype = 3;
691a2d25 2414 }
2415 /**
8bd0068d 2416 * See if we should skip this tag and any content
2417 * inside it.
2418 */
691a2d25 2419 if ($tagtype == 1 &&
8bd0068d 2420 in_array($tagname, $rm_tags_with_content)){
691a2d25 2421 $skip_content = $tagname;
2422 } else {
da2415c1 2423 if (($rm_tags == false
8bd0068d 2424 && in_array($tagname, $tag_list)) ||
2425 ($rm_tags == true &&
2426 !in_array($tagname, $tag_list))){
691a2d25 2427 $tagname = false;
2428 } else {
2dd879b8 2429 /**
8bd0068d 2430 * Convert body into div.
2431 */
2dd879b8 2432 if ($tagname == "body"){
2433 $tagname = "div";
da2415c1 2434 $attary = sq_body2div($attary, $mailbox,
8bd0068d 2435 $message, $id);
2dd879b8 2436 }
691a2d25 2437 if ($tagtype == 1){
2438 if (isset($open_tags{$tagname})){
2439 $open_tags{$tagname}++;
2440 } else {
2441 $open_tags{$tagname}=1;
2442 }
2443 }
2444 /**
8bd0068d 2445 * This is where we run other checks.
2446 */
691a2d25 2447 if (is_array($attary) && sizeof($attary) > 0){
2448 $attary = sq_fixatts($tagname,
8bd0068d 2449 $attary,
2450 $rm_attnames,
2451 $bad_attvals,
2452 $add_attr_to_tag,
2453 $message,
2454 $id,
2455 $mailbox
2456 );
691a2d25 2457 }
2458 }
2459 }
691a2d25 2460 }
2461 }
2462 if ($tagname != false && $skip_content == false){
2463 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2464 }
691a2d25 2465 }
2466 $curpos = $gt+1;
a3daaaf3 2467 }
691a2d25 2468 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2469 if ($force_tag_closing == true){
2470 foreach ($open_tags as $tagname=>$opentimes){
2471 while ($opentimes > 0){
2472 $trusted .= '</' . $tagname . '>';
2473 $opentimes--;
2474 }
2475 }
2476 $trusted .= "\n";
2477 }
2478 $trusted .= "<!-- end sanitized html -->\n";
2479 return $trusted;
2480}
451f74a2 2481
691a2d25 2482/**
8bd0068d 2483 * This is a wrapper function to call html sanitizing routines.
2484 *
2485 * @param $body the body of the message
2486 * @param $id the id of the message
c189a963 2487
2488 * @param $message
2489 * @param $mailbox
2490 * @param boolean $take_mailto_links When TRUE, converts mailto: links
2491 * into internal SM compose links
2492 * (optional; default = TRUE)
8bd0068d 2493 * @return a string with html safe to display in the browser.
2494 */
c189a963 2495function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2496
202bcbcc 2497 // require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
c189a963 2498
691a2d25 2499 global $attachment_common_show_images, $view_unsafe_images,
8bd0068d 2500 $has_unsafe_images;
691a2d25 2501 /**
8bd0068d 2502 * Don't display attached images in HTML mode.
2b665f28 2503 *
d0187bd6 2504 * SB: why?
8bd0068d 2505 */
691a2d25 2506 $attachment_common_show_images = false;
2507 $tag_list = Array(
8bd0068d 2508 false,
2509 "object",
2510 "meta",
2511 "html",
2512 "head",
2513 "base",
2514 "link",
2515 "frame",
2516 "iframe",
2517 "plaintext",
2518 "marquee"
2519 );
691a2d25 2520
2521 $rm_tags_with_content = Array(
8bd0068d 2522 "script",
2523 "applet",
2524 "embed",
2525 "title",
2526 "frameset",
0493ed11 2527 "xmp",
8bd0068d 2528 "xml"
2529 );
691a2d25 2530
2531 $self_closing_tags = Array(
8bd0068d 2532 "img",
2533 "br",
2534 "hr",
2535 "input",
2536 "outbind"
2537 );
691a2d25 2538
2dd879b8 2539 $force_tag_closing = true;
691a2d25 2540
2541 $rm_attnames = Array(
8bd0068d 2542 "/.*/" =>
2543 Array(
2544 "/target/i",
2545 "/^on.*/i",
2546 "/^dynsrc/i",
2547 "/^data.*/i",
2548 "/^lowsrc.*/i"
2549 )
2550 );
691a2d25 2551
2552 $secremoveimg = "../images/" . _("sec_remove_eng.png");
2553 $bad_attvals = Array(
8bd0068d 2554 "/.*/" =>
691a2d25 2555 Array(
0a6ec9b5 2556 "/^src|background/i" =>
8bd0068d 2557 Array(
691a2d25 2558 Array(
8bd0068d 2559 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2560 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2561 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
691a2d25 2562 ),
8bd0068d 2563 Array(
2564 "\\1$secremoveimg\\2",
2565 "\\1$secremoveimg\\2",
2566 "\\1$secremoveimg\\2",
8bd0068d 2567 )
2568 ),
0a6ec9b5 2569 "/^href|action/i" =>
8bd0068d 2570 Array(
0a6ec9b5 2571 Array(
8bd0068d 2572 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2573 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2574 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
0a6ec9b5 2575 ),
691a2d25 2576 Array(
8bd0068d 2577 "\\1#\\1",
2578 "\\1#\\1",
2579 "\\1#\\1"
02474e43 2580 )
8bd0068d 2581 ),
2582 "/^style/i" =>
2583 Array(
2584 Array(
5db90261 2585 "/\/\*.*\*\//",
8bd0068d 2586 "/expression/i",
2587 "/binding/i",
2588 "/behaviou*r/i",
2589 "/include-source/i",
39352565 2590
2591 // position:relative can also be exploited
2592 // to put content outside of email body area
2593 // and position:fixed is similarly exploitable
2594 // as position:absolute, so we'll remove it
2595 // altogether....
2596 //
2597 // Does this screw up legitimate HTML messages?
2598 // If so, the only fix I see is to allow position
2599 // attributes (any values? I think we still have
2600 // to block static and fixed) only if $use_iframe
2601 // is enabled (1.5.0+)
2602 //
2603 // was: "/position\s*:\s*absolute/i",
2604 //
2605 "/position\s*:/i",
2606
1d935bc2 2607 "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
8bd0068d 2608 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2609 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2610 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
39352565 2611 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
8bd0068d 2612 ),
2613 Array(
5db90261 2614 "",
8bd0068d 2615 "idiocy",
2616 "idiocy",
2617 "idiocy",
2618 "idiocy",
567dc524 2619 "idiocy",
5b4884be 2620 "url",
8bd0068d 2621 "url(\\1#\\1)",
2622 "url(\\1#\\1)",
2623 "url(\\1#\\1)",
8bd0068d 2624 "\\1:url(\\2#\\3)"
2625 )
691a2d25 2626 )
8bd0068d 2627 )
691a2d25 2628 );
9ebace19 2629
d31f73f1 2630 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
2631 // images off by default.
afbf184c 2632 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
9ebace19 2633
691a2d25 2634 if (!$view_unsafe_images){
2635 /**
8bd0068d 2636 * Remove any references to http/https if view_unsafe_images set
2637 * to false.
2638 */
02474e43 2639 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
8bd0068d 2640 '/^([\'\"])\s*https*:.*([\'\"])/si');
02474e43 2641 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
8bd0068d 2642 "\\1$secremoveimg\\1");
02474e43 2643 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
7ef0b415 2644 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
02474e43 2645 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
8bd0068d 2646 "url(\\1$secremoveimg\\1)");
691a2d25 2647 }
451f74a2 2648
691a2d25 2649 $add_attr_to_tag = Array(
8bd0068d 2650 "/^a$/i" =>
c25f2fbb 2651 Array('target'=>'"_blank"',
02474e43 2652 'title'=>'"'._("This external link will open in a new window").'"'
8bd0068d 2653 )
2654 );
da2415c1 2655 $trusted = sq_sanitize($body,
8bd0068d 2656 $tag_list,
2657 $rm_tags_with_content,
2658 $self_closing_tags,
2659 $force_tag_closing,
2660 $rm_attnames,
2661 $bad_attvals,
2662 $add_attr_to_tag,
2663 $message,
2664 $id,
2665 $mailbox
2666 );
567dc524 2667 if (strpos($trusted,$secremoveimg)){
691a2d25 2668 $has_unsafe_images = true;
da2415c1 2669 }
c189a963 2670
2671 // we want to parse mailto's in HTML output, change to SM compose links
2672 // this is a modified version of code from url_parser.php... but Marc is
2673 // right: we need a better filtering implementation; adding this randomly
2674 // here is not a great solution
2675 //
2676 if ($take_mailto_links) {
2677 // parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
2678 global $MailTo_PReg_Match;
202bcbcc 2679 $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
c189a963 2680 if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2681 foreach ($regs[0] as $i => $mailto_before) {
2682 $mailto_params = $regs[10][$i];
2683 // get rid of any tailing quote since we have to add send_to to the end
2684 //
2685 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
2686 $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
2687 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
2688 $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
2689
2690 if ($regs[1][$i]) { //if there is an email addr before '?', we need to merge it with the params
2691 $to = 'to=' . $regs[1][$i];
2692 if (strpos($mailto_params, 'to=') > -1) //already a 'to='
2693 $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2694 else {
2695 if ($mailto_params) //already some params, append to them
2696 $mailto_params .= '&amp;' . $to;
2697 else
2698 $mailto_params .= '?' . $to;
2699 }
2700 }
2701
2702 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2703
2704 // we'll already have target=_blank, no need to allow comp_in_new
2705 // here (which would be a lot more work anyway)
2706 //
2707 global $compose_new_win;
2708 $temp_comp_in_new = $compose_new_win;
2709 $compose_new_win = 0;
2710 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2711 $compose_new_win = $temp_comp_in_new;
2712
2713 // remove <a href=" and anything after the next quote (we only
2714 // need the uri, not the link HTML) in compose uri
2715 //
2716 $comp_uri = substr($comp_uri, 9);
2717 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2718 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2719 }
2720 }
2721 }
2722
691a2d25 2723 return $trusted;
451f74a2 2724}
a4a70693 2725
da2415c1 2726/**
8bd0068d 2727 * function SendDownloadHeaders - send file to the browser
2728 *
2729 * Original Source: SM core src/download.php
2730 * moved here to make it available to other code, and separate
2731 * front end from back end functionality.
2732 *
2733 * @param string $type0 first half of mime type
2734 * @param string $type1 second half of mime type
2735 * @param string $filename filename to tell the browser for downloaded file
2736 * @param boolean $force whether to force the download dialog to pop
2737 * @param optional integer $filesize send the Content-Header and length to the browser
2738 * @return void
2739 */
02474e43 2740function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2741 global $languages, $squirrelmail_language;
cfffd60b 2742 $isIE = $isIE6plus = false;
02474e43 2743
2744 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2745
2746 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
8bd0068d 2747 strstr($HTTP_USER_AGENT, 'Opera') === false) {
cfffd60b 2748 $isIE = true;
02474e43 2749 }
2750
cfffd60b 2751 if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2752 ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2753 $isIE6plus = true;
02474e43 2754 }
2755
2756 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 2757 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
02474e43 2758 $filename =
8bd0068d 2759 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
02474e43 2760 } else {
1a4bc4a6 2761 $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&nbsp;', ' ', $filename));
02474e43 2762 }
2763
2764 // A Pox on Microsoft and it's Internet Explorer!
2765 //
2766 // IE has lots of bugs with file downloads.
2767 // It also has problems with SSL. Both of these cause problems
2768 // for us in this function.
2769 //
2770 // See this article on Cache Control headers and SSL
2771 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2772 //
2773 // The best thing you can do for IE is to upgrade to the latest
2774 // version
2775 //set all the Cache Control Headers for IE
2776 if ($isIE) {
2777 $filename=rawurlencode($filename);
2778 header ("Pragma: public");
8bd0068d 2779 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
02474e43 2780 header ("Cache-Control: post-check=0, pre-check=0", false);
8bd0068d 2781 header ("Cache-Control: private");
02474e43 2782
2783 //set the inline header for IE, we'll add the attachment header later if we need it
2784 header ("Content-Disposition: inline; filename=$filename");
2785 }
2786
2787 if (!$force) {
2788 // Try to show in browser window
2789 header ("Content-Disposition: inline; filename=\"$filename\"");
2790 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2791 } else {
2792 // Try to pop up the "save as" box
2793
2794 // IE makes this hard. It pops up 2 save boxes, or none.
2795 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2796 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2797 // But, according to Microsoft, it is "RFC compliant but doesn't
2798 // take into account some deviations that allowed within the
2799 // specification." Doesn't that mean RFC non-compliant?
2800 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2801
2802 // all browsers need the application/octet-stream header for this
2803 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2804
2805 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2806 // Do not have quotes around filename, but that applied to
2807 // "attachment"... does it apply to inline too?
2808 header ("Content-Disposition: attachment; filename=\"$filename\"");
2809
cfffd60b 2810 if ($isIE && !$isIE6plus) {
02474e43 2811 // This combination seems to work mostly. IE 5.5 SP 1 has
2812 // known issues (see the Microsoft Knowledge Base)
2813
2814 // This works for most types, but doesn't work with Word files
2815 header ("Content-Type: application/download; name=\"$filename\"");
7e2ff844 2816 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2817 // These are spares, just in case. :-)
2818 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2819 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2820 //header("Content-Type: application/octet-stream; name=\"$filename\"");
7e2ff844 2821 } else if ($isIE) {
2822 // This is to prevent IE for MIME sniffing and auto open a file in IE
2823 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2824 } else {
2825 // another application/octet-stream forces download for Netscape
2826 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2827 }
2828 }
2829
2830 //send the content-length header if the calling function provides it
2831 if ($filesize > 0) {
2832 header("Content-Length: $filesize");
2833 }
07c49f57 2834
8d863f64 2835} // end fn SendDownloadHeaders
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