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Encoded From headers now properly quoted (#2830141). A better fix might be to re...
[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 *
1977ab55 9 * @copyright 1999-2010 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 />';
472e7acb 66 $errormessage .= '<pre>' . htmlspecialchars($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));
140 } while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH.*/i', $topline)) ;
a4a70693 141
451f74a2 142 $wholemessage = implode('', $data);
b7910e12 143 if (preg_match('/\{([^\}]*)\}/', $topline, $regs)) {
3d8371be 144 $ret = substr($wholemessage, 0, $regs[1]);
145 /* There is some information in the content info header that could be important
8bd0068d 146 * in order to parse html messages. Let's get them here.
147 */
0600bdf1 148// if ($ret{0} == '<') {
6201339c 149// $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, TRUE);
0600bdf1 150// }
b7910e12 151 } else if (preg_match('/"([^"]*)"/', $topline, $regs)) {
451f74a2 152 $ret = $regs[1];
06bcb9c3 153 } else if ((stristr($topline, 'nil') !== false) && (empty($wholemessage))) {
154 $ret = $wholemessage;
451f74a2 155 } else {
156 global $where, $what, $mailbox, $passed_id, $startMessage;
3d8371be 157 $par = 'mailbox=' . urlencode($mailbox) . '&amp;passed_id=' . $passed_id;
451f74a2 158 if (isset($where) && isset($what)) {
3d8371be 159 $par .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
a3daaaf3 160 } else {
3d8371be 161 $par .= '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
451f74a2 162 }
e5ea9327 163 $par .= '&amp;response=' . urlencode($response) .
8bd0068d 164 '&amp;message=' . urlencode($message) .
165 '&amp;topline=' . urlencode($topline);
a019eeb8 166
8bd0068d 167 echo '<tt><br />' .
02474e43 168 '<table width="80%"><tr>' .
169 '<tr><td colspan="2">' .
170 _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
171 '</td></tr>' .
172 '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
173 '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
174 '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
175 '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
176 "</table><br /></tt></font><hr />";
346817d4 177
6201339c 178 $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, TRUE);
451f74a2 179 array_shift($data);
180 $wholemessage = implode('', $data);
a019eeb8 181
346817d4 182 $ret = $wholemessage;
a3daaaf3 183 }
3d8371be 184 return $ret;
451f74a2 185}
d4467150 186
fa26ab45 187function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding, $rStream='php://stdout', $force_crlf='') {
1035e159 188
3d8371be 189 /* Don't kill the connection if the browser is over a dialup
8bd0068d 190 * and it would take over 30 seconds to download it.
191 * Don't call set_time_limit in safe mode.
192 */
b7206e1d 193
3d8371be 194 if (!ini_get('safe_mode')) {
b7206e1d 195 set_time_limit(0);
196 }
7c7b74b3 197 /* in case of base64 encoded attachments, do not buffer them.
8bd0068d 198 Instead, echo the decoded attachment directly to screen */
7c7b74b3 199 if (strtolower($encoding) == 'base64') {
200 if (!$ent_id) {
7591f143 201 $query = "FETCH $id BODY[]";
7c7b74b3 202 } else {
7591f143 203 $query = "FETCH $id BODY[$ent_id]";
7c7b74b3 204 }
7591f143 205 sqimap_run_command($imap_stream,$query,true,$response,$message,TRUE,'sqimap_base64_decode',$rStream,true);
1d142b8d 206 } else {
7591f143 207 $body = mime_fetch_body ($imap_stream, $id, $ent_id);
208 if (is_resource($rStream)) {
fa26ab45 209 fputs($rStream,decodeBody($body, $encoding, $force_crlf));
7591f143 210 } else {
fa26ab45 211 echo decodeBody($body, $encoding, $force_crlf);
7591f143 212 }
1d142b8d 213 }
346817d4 214
da2415c1 215 /*
8bd0068d 216 TODO, use the same method for quoted printable.
217 However, I assume that quoted printable attachments aren't that large
218 so the performancegain / memory usage drop will be minimal.
219 If we decide to add that then we need to adapt sqimap_fread because
220 we need to split te result on \n and fread doesn't stop at \n. That
221 means we also should provide $results from sqimap_fread (by ref) to
222 te function and set $no_return to false. The $filter function for
223 quoted printable should handle unsetting of $results.
224 */
da2415c1 225 /*
8bd0068d 226 TODO 2: find out how we write to the output stream php://stdout. fwrite
227 doesn't work because 'php://stdout isn't a stream.
228 */
7c7b74b3 229
5d9c6f73 230 return;
451f74a2 231}
beb9e459 232
451f74a2 233/* -[ END MIME DECODING ]----------------------------------------------------------- */
d4467150 234
3d8371be 235/* This is here for debugging purposes. It will print out a list
8bd0068d 236 * of all the entity IDs that are in the $message object.
237 */
451f74a2 238function listEntities ($message) {
3d8371be 239 if ($message) {
3c621ba1 240 echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br />';
3d8371be 241 for ($i = 0; isset($message->entities[$i]); $i++) {
242 echo "$i : ";
243 $msg = listEntities($message->entities[$i]);
244
245 if ($msg) {
246 echo "return: ";
247 return $msg;
248 }
249 }
a4a70693 250 }
451f74a2 251}
f0c4dc12 252
f792c641 253function getPriorityStr($priority) {
3d8371be 254 $priority_level = substr($priority,0,1);
255
256 switch($priority_level) {
257 /* Check for a higher then normal priority. */
258 case '1':
259 case '2':
260 $priority_string = _("High");
261 break;
262
263 /* Check for a lower then normal priority. */
264 case '4':
265 case '5':
266 $priority_string = _("Low");
267 break;
268
269 /* Check for a normal priority. */
270 case '3':
271 default:
272 $priority_level = '3';
273 $priority_string = _("Normal");
274 break;
275
276 }
277 return $priority_string;
f792c641 278}
279
451f74a2 280/* returns a $message object for a particular entity id */
281function getEntity ($message, $ent_id) {
a4a70693 282 return $message->getEntity($ent_id);
451f74a2 283}
8beafbbc 284
3d8371be 285/* translateText
8bd0068d 286 * Extracted from strings.php 23/03/2002
287 */
da4c66e8 288
289function translateText(&$body, $wrap_at, $charset) {
3d8371be 290 global $where, $what; /* from searching */
291 global $color; /* color theme */
da4c66e8 292
202bcbcc 293 // require_once(SM_PATH . 'functions/url_parser.php');
da4c66e8 294
295 $body_ary = explode("\n", $body);
da4c66e8 296 for ($i=0; $i < count($body_ary); $i++) {
4c1f4be3 297 $line = rtrim($body_ary[$i],"\r");
298
da4c66e8 299 if (strlen($line) - 2 >= $wrap_at) {
c7aff938 300 sqWordWrap($line, $wrap_at, $charset);
da4c66e8 301 }
302 $line = charset_decode($charset, $line);
303 $line = str_replace("\t", ' ', $line);
304
305 parseUrl ($line);
306
3d8371be 307 $quotes = 0;
da4c66e8 308 $pos = 0;
3d8371be 309 $j = strlen($line);
da4c66e8 310
3d8371be 311 while ($pos < $j) {
da4c66e8 312 if ($line[$pos] == ' ') {
3d8371be 313 $pos++;
da4c66e8 314 } else if (strpos($line, '&gt;', $pos) === $pos) {
315 $pos += 4;
3d8371be 316 $quotes++;
da4c66e8 317 } else {
318 break;
319 }
320 }
3d8371be 321
83c94382 322 if ($quotes % 2) {
d0814c02 323 $line = '<span class="quote1">' . $line . '</span>';
4c25967c 324 } elseif ($quotes) {
d0814c02 325 $line = '<span class="quote2">' . $line . '</span>';
da4c66e8 326 }
3d8371be 327
da4c66e8 328 $body_ary[$i] = $line;
329 }
330 $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
331}
332
a2bfcbce 333/**
da1b55ad 334 * This returns a parsed string called $body. That string can then
335 * be displayed as the actual message in the HTML. It contains
336 * everything needed, including HTML Tags, Attachments at the
337 * bottom, etc.
f8a1ed5a 338 *
da1b55ad 339 * Since 1.2.0 function uses message_body hook.
340 * Till 1.3.0 function included output of formatAttachments().
341 *
342 * @param resource $imap_stream imap connection resource
343 * @param object $message squirrelmail message object
344 * @param array $color squirrelmail color theme array
345 * @param integer $wrap_at number of characters per line
346 * @param string $ent_num (since 1.3.0) message part id
347 * @param integer $id (since 1.3.0) message id
348 * @param string $mailbox (since 1.3.0) imap folder name
da1b55ad 349 * @return string html formated message text
350 */
a540f994 351function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX') {
3d8371be 352 /* This if statement checks for the entity to show as the
8bd0068d 353 * primary message. To add more of them, just put them in the
354 * order that is their priority.
355 */
ce68b76b 356 global $startMessage, $languages, $squirrelmail_language,
40a34e57 357 $show_html_default, $sort, $has_unsafe_images, $passed_ent_id,
14c85e39 358 $use_iframe, $iframe_height, $download_and_unsafe_link,
955bfc8f 359 $download_href, $unsafe_image_toggle_href, $unsafe_image_toggle_text,
551c7b53 360 $oTemplate, $nbsp;
2c25d36a 361
362 // workaround for not updated config.php
363 if (! isset($use_iframe)) $use_iframe = false;
77bfbd2e 364
d31f73f1 365 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
366 // images off by default.
afbf184c 367 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
d03c24f4 368
cc34b00d 369 $body = '';
23bcec6f 370 $urlmailbox = urlencode($mailbox);
451f74a2 371 $body_message = getEntity($message, $ent_num);
372 if (($body_message->header->type0 == 'text') ||
8bd0068d 373 ($body_message->header->type0 == 'rfc822')) {
3d8371be 374 $body = mime_fetch_body ($imap_stream, $id, $ent_num);
451f74a2 375 $body = decodeBody($body, $body_message->header->encoding);
e842b215 376
377 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 378 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode')) {
e842b215 379 if (mb_detect_encoding($body) != 'ASCII') {
33a55f5a 380 $body = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode',$body);
e842b215 381 }
382 }
d849b570 383
384 /* As of 1.5.2, $body is passed (and modified) by reference */
385 do_hook('message_body', $body);
23bcec6f 386
3d8371be 387 /* If there are other types that shouldn't be formatted, add
8bd0068d 388 * them here.
389 */
3d8371be 390
451f74a2 391 if ($body_message->header->type1 == 'html') {
3d8371be 392 if ($show_html_default <> 1) {
85015544 393 $entity_conv = array('&nbsp;' => ' ',
8bd0068d 394 '<p>' => "\n",
395 '<P>' => "\n",
396 '<br>' => "\n",
397 '<BR>' => "\n",
398 '<br />' => "\n",
399 '<BR />' => "\n",
400 '&gt;' => '>',
401 '&lt;' => '<');
85015544 402 $body = strtr($body, $entity_conv);
3d8371be 403 $body = strip_tags($body);
85015544 404 $body = trim($body);
405 translateText($body, $wrap_at,
8bd0068d 406 $body_message->header->getParameter('charset'));
a540f994 407 } elseif ($use_iframe) {
84410f31 408 /**
409 * If we don't add html message between iframe tags,
410 * we must detect unsafe images and modify $has_unsafe_images.
f8a1ed5a 411 */
758a7889 412 $html_body = magicHTML($body, $id, $message, $mailbox);
b6c52e61 413 // Convert character set in order to display html mails in different character set
414 $html_body = charset_decode($body_message->header->getParameter('charset'),$html_body,false,true);
84410f31 415
2c25d36a 416 // creating iframe url
417 $iframeurl=sqm_baseuri().'src/view_html.php?'
f8a1ed5a 418 . 'mailbox=' . $urlmailbox
2c25d36a 419 . '&amp;passed_id=' . $id
420 . '&amp;ent_id=' . $ent_num
421 . '&amp;view_unsafe_images=' . (int) $view_unsafe_images;
422
79d58d4c 423 global $oTemplate;
424 $oTemplate->assign('iframe_url', $iframeurl);
51554708 425 $oTemplate->assign('iframe_height', $iframe_height);
79d58d4c 426 $oTemplate->assign('html_body', $html_body);
2b665f28 427
79d58d4c 428 $body = $oTemplate->fetch('read_html_iframe.tpl');
a3daaaf3 429 } else {
2c25d36a 430 // old way of html rendering
b6c52e61 431 /**
758a7889 432 * convert character set. charset_decode does not remove html special chars
b6c52e61 433 * applied by magicHTML functions and does not sanitize them second time if
758a7889 434 * fourth argument is true.
435 */
567dc524 436 $charset = $body_message->header->getParameter('charset');
437 if (!empty($charset)) {
438 $body = charset_decode($charset,$body,false,true);
439 }
440 $body = magicHTML($body, $id, $message, $mailbox);
a3daaaf3 441 }
451f74a2 442 } else {
3d8371be 443 translateText($body, $wrap_at,
8bd0068d 444 $body_message->header->getParameter('charset'));
451f74a2 445 }
a2bfcbce 446
9ebace19 447 /*
448 * Previously the links for downloading and unsafe images were printed
449 * under the mail. By putting the links in a global variable we can
450 * print it in the toolbar where it belongs. Since the original code was
451 * in this place it's left here. It might be possible to move it to some
452 * other place if that makes sense. The possibility to do so has not
453 * been evaluated yet.
454 */
455
456 // Initialize the global variable to an empty string.
457 // 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 458 $download_and_unsafe_link = '';
459
9ebace19 460 // Prepare and build a link for downloading the mail.
83cf04bd 461 $link = 'passed_id=' . $id . '&amp;ent_id='.$ent_num.
8bd0068d 462 '&amp;mailbox=' . $urlmailbox .'&amp;sort=' . $sort .
463 '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
08b7f7cc 464 if (isset($passed_ent_id)) {
465 $link .= '&amp;passed_ent_id='.$passed_ent_id;
466 }
14c85e39 467 $download_href = SM_PATH . 'src/download.php?absolute_dl=true&amp;' . $link;
9ebace19 468
469 // Always add the link for downloading the mail as a file to the global
470 // variable.
955bfc8f 471 $download_and_unsafe_link .= "$nbsp|$nbsp"
472 . create_hyperlink($download_href, _("Download this as a file"));
9ebace19 473
474 // Find out the right text to use in the link depending on the
475 // circumstances. If the unsafe images are displayed the link should
476 // hide them, if they aren't displayed the link should only appear if
477 // the mail really contains unsafe images.
7aad7b77 478 if ($view_unsafe_images) {
23f617b8 479 $text = _("Hide Unsafe Images");
7aad7b77 480 } else {
08b7f7cc 481 if (isset($has_unsafe_images) && $has_unsafe_images) {
482 $link .= '&amp;view_unsafe_images=1';
483 $text = _("View Unsafe Images");
484 } else {
485 $text = '';
486 }
3d8371be 487 }
9ebace19 488
489 // Only create a link for unsafe images if there's need for one. If so:
490 // add it to the global variable.
83cf04bd 491 if($text != '') {
14c85e39 492 $unsafe_image_toggle_href = SM_PATH . 'src/read_body.php?'.$link;
493 $unsafe_image_toggle_text = $text;
955bfc8f 494 $download_and_unsafe_link .= "$nbsp|$nbsp"
495 . create_hyperlink($unsafe_image_toggle_href, $text);
83cf04bd 496 }
3d8371be 497 }
498 return $body;
451f74a2 499}
b74ba498 500
da1b55ad 501/**
a540f994 502 * Generate attachments array for passing to templates.
2b665f28 503 *
d67f519a 504 * @since 1.5.2
da1b55ad 505 * @param object $message SquirrelMail message object
506 * @param array $exclude_id message parts that are not attachments.
507 * @param string $mailbox mailbox name
508 * @param integer $id message id
da1b55ad 509 */
d67f519a 510function buildAttachmentArray($message, $exclude_id, $mailbox, $id) {
511 global $where, $what, $startMessage, $color, $passed_ent_id, $base_uri;
451f74a2 512
23bcec6f 513 $att_ar = $message->getAttachments($exclude_id);
23bcec6f 514 $urlMailbox = urlencode($mailbox);
515
d67f519a 516 $attachments = array();
23bcec6f 517 foreach ($att_ar as $att) {
fdc9d9b5 518 $ent = $att->entity_id;
2e25760a 519 $header = $att->header;
f0c4dc12 520 $type0 = strtolower($header->type0);
521 $type1 = strtolower($header->type1);
2e25760a 522 $name = '';
d0187bd6 523 $links = array();
21dab2dc 524 $links['download link']['text'] = _("Download");
202bcbcc 525 $links['download link']['href'] = $base_uri .
8bd0068d 526 "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
2b665f28 527
2e25760a 528 if ($type0 =='message' && $type1 == 'rfc822') {
202bcbcc 529 $default_page = $base_uri . 'src/read_body.php';
2e25760a 530 $rfc822_header = $att->rfc822_header;
098ea084 531 $filename = $rfc822_header->subject;
6cc08d8b 532 if (trim( $filename ) == '') {
533 $filename = 'untitled-[' . $ent . ']' ;
08b7f7cc 534 }
2e25760a 535 $from_o = $rfc822_header->from;
536 if (is_object($from_o)) {
04ea844e 537 $from_name = decodeHeader($from_o->getAddress(false));
7e697748 538 } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
539 // something weird happens when a digest message is opened and you return to the digest
540 // now the from object is part of an array. Probably the parseHeader call overwrites the info
541 // retrieved from the bodystructure in a different way. We need to fix this later.
542 // possible starting point, do not fetch header we already have and inspect how
543 // the rfc822_header object behaves.
544 $from_name = decodeHeader($from_o[0]->getAddress(false));
2e25760a 545 } else {
546 $from_name = _("Unknown sender");
f0c4dc12 547 }
d0187bd6 548 $description = _("From").': '.$from_name;
23bcec6f 549 } else {
202bcbcc 550 $default_page = $base_uri . 'src/download.php';
02474e43 551 $filename = $att->getFilename();
f810c0b2 552 if ($header->description) {
098ea084 553 $description = decodeHeader($header->description);
f810c0b2 554 } else {
3d8371be 555 $description = '';
556 }
2e25760a 557 }
558
559 $display_filename = $filename;
3d8371be 560 if (isset($passed_ent_id)) {
561 $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
562 } else {
563 $passed_ent_id_link = '';
564 }
565 $defaultlink = $default_page . "?startMessage=$startMessage"
8bd0068d 566 . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
567 . '&amp;ent_id='.$ent.$passed_ent_id_link;
2e25760a 568 if ($where && $what) {
8bd0068d 569 $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
2e25760a 570 }
7e2ff844 571 // IE does make use of mime content sniffing. Forcing a download
572 // prohibit execution of XSS inside an application/octet-stream attachment
573 if ($type0 == 'application' && $type1 == 'octet-stream') {
574 $defaultlink .= '&amp;absolute_dl=true';
575 }
2b665f28 576
3d8371be 577 /* This executes the attachment hook with a specific MIME-type.
8bd0068d 578 * If that doesn't have results, it tries if there's a rule
9b94c54d 579 * for a more generic type. Finally, a hook for ALL attachment
580 * types is run as well.
8bd0068d 581 */
8dca4d22 582 // First remember the default link.
583 $defaultlink_orig = $defaultlink;
584
d849b570 585 /* The API for this hook has changed as of 1.5.2 so that all plugin
586 arguments are passed in an array instead of each their own plugin
587 argument, and arguments are passed by reference, so instead of
588 returning any changes, changes should simply be made to the original
589 arguments themselves. */
9c3b2d22 590 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
591 &$defaultlink, &$display_filename, &$where, &$what);
592 do_hook("attachment $type0/$type1", $temp);
8dca4d22 593 if(count($links) <= 1 && $defaultlink == $defaultlink_orig) {
d849b570 594 /* The API for this hook has changed as of 1.5.2 so that all plugin
595 arguments are passed in an array instead of each their own plugin
596 argument, and arguments are passed by reference, so instead of
597 returning any changes, changes should simply be made to the original
598 arguments themselves. */
9c3b2d22 599 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
600 &$defaultlink, &$display_filename, &$where, &$what);
601 do_hook("attachment $type0/*", $temp);
2e25760a 602 }
d849b570 603 /* The API for this hook has changed as of 1.5.2 so that all plugin
604 arguments are passed in an array instead of each their own plugin
605 argument, and arguments are passed by reference, so instead of
606 returning any changes, changes should simply be made to the original
607 arguments themselves. */
9c3b2d22 608 $temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
609 &$defaultlink, &$display_filename, &$where, &$what);
8dca4d22 610 // Do not let a generic plugin change the default link if a more
611 // specialized one already did it...
612 if ($defaultlink != $defaultlink_orig) {
613 $dummy = '';
614 $temp[5] = &$dummy;
615 }
9c3b2d22 616 do_hook("attachment */*", $temp);
77b88425 617
d67f519a 618 $this_attachment = array();
619 $this_attachment['Name'] = decodeHeader($display_filename);
620 $this_attachment['Description'] = $description;
621 $this_attachment['DefaultHREF'] = $defaultlink;
622 $this_attachment['DownloadHREF'] = $links['download link']['href'];
623 $this_attachment['ViewHREF'] = isset($links['attachment_common']) ? $links['attachment_common']['href'] : '';
624 $this_attachment['Size'] = $header->size;
625 $this_attachment['ContentType'] = htmlspecialchars($type0 .'/'. $type1);
626 $this_attachment['OtherLinks'] = array();
3d8371be 627 foreach ($links as $val) {
d0187bd6 628 if ($val['text']==_("Download") || $val['text'] == _("View"))
629 continue;
630 if (empty($val['text']) && empty($val['extra']))
631 continue;
2b665f28 632
d67f519a 633 $temp = array();
634 $temp['HREF'] = $val['href'];
635 $temp['Text'] = (empty($val['text']) ? '' : $val['text']) . (empty($val['extra']) ? '' : $val['extra']);
636 $this_attachment['OtherLinks'][] = $temp;
2e25760a 637 }
d67f519a 638 $attachments[] = $this_attachment;
2b665f28 639
3d8371be 640 unset($links);
2e25760a 641 }
2b665f28 642
d67f519a 643 return $attachments;
644}
645
646/**
647 * Displays attachment links and information
648 *
649 * Since 1.3.0 function is not included in formatBody() call.
650 *
651 * Since 1.0.2 uses attachment $type0/$type1 hook.
652 * Since 1.2.5 uses attachment $type0/* hook.
653 * Since 1.5.0 uses attachments_bottom hook.
654 * Since 1.5.2 uses templates and does *not* return a value.
655 *
656 * @param object $message SquirrelMail message object
657 * @param array $exclude_id message parts that are not attachments.
658 * @param string $mailbox mailbox name
659 * @param integer $id message id
660 */
661function formatAttachments($message, $exclude_id, $mailbox, $id) {
662 global $oTemplate;
2b665f28 663
d67f519a 664 $attach = buildAttachmentArray($message, $exclude_id, $mailbox, $id);
d0187bd6 665
666 $oTemplate->assign('attachments', $attach);
667 $oTemplate->display('read_attachments.tpl');
451f74a2 668}
b74ba498 669
7c7b74b3 670function sqimap_base64_decode(&$string) {
7c0ec1d8 671
b17a8968 672 // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
7c0ec1d8 673 // fly decoding (to reduce memory usage) you have to check if the
674 // data has incomplete pairs
675
b17a8968 676 // Remove the noise in order to check if the 4 bytes pairs are complete
7c0ec1d8 677 $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
678
42ce44f8 679 $sStringRem = '';
7c0ec1d8 680 $iMod = strlen($string) % 4;
681 if ($iMod) {
682 $sStringRem = substr($string,-$iMod);
b17a8968 683 // Check if $sStringRem contains padding characters
7c0ec1d8 684 if (substr($sStringRem,-1) != '=') {
685 $string = substr($string,0,-$iMod);
686 } else {
687 $sStringRem = '';
688 }
689 }
7c7b74b3 690 $string = base64_decode($string);
7c0ec1d8 691 return $sStringRem;
7c7b74b3 692}
693
fdf7cef1 694/**
fa26ab45 695 * Decodes encoded string (usually message body)
696 *
697 * This function decodes a string (usually the message body)
698 * depending on the encoding type. Currently quoted-printable
699 * and base64 encodings are supported.
700 *
701 * The decode_body hook was added to this function in 1.4.2/1.5.0.
702 * The $force_crlf parameter was added in 1.5.2.
703 *
704 * @param string $string The encoded string
705 * @param string $encoding used encoding
706 * @param string $force_crlf Whether or not to force CRLF or LF
707 * line endings (or to leave as is).
708 * If given as "LF", line endings will
709 * all be converted to LF; if "CRLF",
710 * line endings will all be converted
711 * to CRLF. If given as an empty value,
9785376e 712 * the global $force_crlf_default will
fa26ab45 713 * be consulted (it can be specified in
714 * config/config_local.php). Otherwise,
715 * any other value will cause the string
716 * to be left alone. Note that this will
717 * be overridden to "LF" if not using at
718 * least PHP version 4.3.0. (OPTIONAL;
719 * default is empty - consult global
720 * default value)
721 *
722 * @return string The decoded string
fdf7cef1 723 *
fdf7cef1 724 * @since 1.0
fa26ab45 725 *
fdf7cef1 726 */
fa26ab45 727function decodeBody($string, $encoding, $force_crlf='') {
728
729 global $force_crlf_default;
730 if (empty($force_crlf)) $force_crlf = $force_crlf_default;
731 $force_crlf = strtoupper($force_crlf);
732
733 // must force line endings to LF due to broken
734 // quoted_printable_decode() in PHP versions
735 // before 4.3.0 (see below)
736 //
737 if (!check_php_version(4, 3, 0) || $force_crlf == 'LF')
738 $string = str_replace("\r\n", "\n", $string);
739 else if ($force_crlf == 'CRLF')
740 $string = str_replace("\n", "\r\n", $string);
83be314a 741
b583c3e8 742 $encoding = strtolower($encoding);
3d8371be 743
d849b570 744 $encoding_handler = do_hook('decode_body', $encoding);
5166f86a 745
746
fa26ab45 747 // plugins get first shot at decoding the string
5166f86a 748 //
749 if (!empty($encoding_handler) && function_exists($encoding_handler)) {
fa26ab45 750 $string = $encoding_handler('decode', $string);
5166f86a 751
fdf7cef1 752 } elseif ($encoding == 'quoted-printable' ||
8bd0068d 753 $encoding == 'quoted_printable') {
fa26ab45 754
755 // quoted_printable_decode() function is broken in older
756 // php versions. Text with \r\n decoding was fixed only
757 // in php 4.3.0. Minimal code requirement is PHP 4.0.4+
758 // and the above call to: str_replace("\r\n", "\n", $string);
759 //
760 $string = quoted_printable_decode($string);
761
fdf7cef1 762 } elseif ($encoding == 'base64') {
fa26ab45 763 $string = base64_decode($string);
b583c3e8 764 }
3d8371be 765
b583c3e8 766 // All other encodings are returned raw.
fa26ab45 767 return $string;
451f74a2 768}
769
9f7f68c3 770/**
8bd0068d 771 * Decodes headers
772 *
e1115979 773 * This function decodes strings that are encoded according to
8bd0068d 774 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
775 * Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
776 *
777 * @param string $string header string that has to be made readable
778 * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
bcae324b 779 * @param boolean $htmlsafe preserve spaces and sanitize html special characters. defaults to true
8bd0068d 780 * @param boolean $decide decide if string can be utfencoded. defaults to false
781 * @return string decoded header string
782 */
bcae324b 783function decodeHeader ($string, $utfencode=true,$htmlsafe=true,$decide=false) {
d6f584fc 784 global $languages, $squirrelmail_language,$default_charset;
79e07c7e 785 if (is_array($string)) {
786 $string = implode("\n", $string);
787 }
da2415c1 788
10dec454 789 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 790 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
33a55f5a 791 $string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
08b7f7cc 792 // Do we need to return at this point?
793 // return $string;
83be314a 794 }
79e07c7e 795 $i = 0;
08b7f7cc 796 $iLastMatch = -2;
db65b6b0 797 $encoded = true;
0a06275a 798
098ea084 799 $aString = explode(' ',$string);
08b7f7cc 800 $ret = '';
098ea084 801 foreach ($aString as $chunk) {
358a78a1 802 if ($encoded && $chunk === '') {
08b7f7cc 803 continue;
358a78a1 804 } elseif ($chunk === '') {
08b7f7cc 805 $ret .= ' ';
806 continue;
807 }
098ea084 808 $encoded = false;
08b7f7cc 809 /* if encoded words are not separated by a linear-space-white we still catch them */
810 $j = $i-1;
7e6ca3e8 811
08b7f7cc 812 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
813 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
814 if ($iLastMatch !== $j) {
bcae324b 815 if ($htmlsafe) {
9f7f68c3 816 $ret .= '&#32;';
08b7f7cc 817 } else {
818 $ret .= ' ';
819 }
820 }
821 $iLastMatch = $i;
822 $j = $i;
bcae324b 823 if ($htmlsafe) {
cb718de0 824 $ret .= htmlspecialchars($res[1]);
825 } else {
826 $ret .= $res[1];
827 }
098ea084 828 $encoding = ucfirst($res[3]);
d6f584fc 829
830 /* decide about valid decoding */
831 if ($decide && is_conversion_safe($res[2])) {
8bd0068d 832 $utfencode=true;
833 $can_be_encoded=true;
d6f584fc 834 } else {
8bd0068d 835 $can_be_encoded=false;
d6f584fc 836 }
098ea084 837 switch ($encoding)
838 {
8bd0068d 839 case 'B':
840 $replace = base64_decode($res[4]);
841 if ($utfencode) {
842 if ($can_be_encoded) {
843 /* convert string to different charset,
844 * if functions asks for it (usually in compose)
845 */
bcae324b 846 $ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
8bd0068d 847 } else {
848 // convert string to html codes in order to display it
849 $ret .= charset_decode($res[2],$replace);
850 }
fab65ca9 851 } else {
bcae324b 852 if ($htmlsafe) {
8bd0068d 853 $replace = htmlspecialchars($replace);
854 }
855 $ret.= $replace;
fab65ca9 856 }
8bd0068d 857 break;
858 case 'Q':
859 $replace = str_replace('_', ' ', $res[4]);
860 $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
861 $replace);
862 if ($utfencode) {
863 if ($can_be_encoded) {
864 /* convert string to different charset,
865 * if functions asks for it (usually in compose)
866 */
bcae324b 867 $replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
8bd0068d 868 } else {
869 // convert string to html codes in order to display it
870 $replace = charset_decode($res[2], $replace);
871 }
872 } else {
bcae324b 873 if ($htmlsafe) {
8bd0068d 874 $replace = htmlspecialchars($replace);
875 }
098ea084 876 }
8bd0068d 877 $ret .= $replace;
878 break;
879 default:
880 break;
79e07c7e 881 }
098ea084 882 $chunk = $res[5];
883 $encoded = true;
08b7f7cc 884 }
885 if (!$encoded) {
bcae324b 886 if ($htmlsafe) {
9f7f68c3 887 $ret .= '&#32;';
08b7f7cc 888 } else {
889 $ret .= ' ';
da2415c1 890 }
08b7f7cc 891 }
dc3d13a7 892
bcae324b 893 if (!$encoded && $htmlsafe) {
dc3d13a7 894 $ret .= htmlspecialchars($chunk);
895 } else {
896 $ret .= $chunk;
897 }
098ea084 898 ++$i;
899 }
fd81e884 900 /* remove the first added space */
901 if ($ret) {
bcae324b 902 if ($htmlsafe) {
9f7f68c3 903 $ret = substr($ret,5);
fd81e884 904 } else {
905 $ret = substr($ret,1);
906 }
907 }
da2415c1 908
08b7f7cc 909 return $ret;
451f74a2 910}
911
9f7f68c3 912/**
a24cf710 913 * Encodes header
8bd0068d 914 *
a24cf710 915 * Function uses XTRA_CODE _encodeheader function, if such function exists.
a24cf710 916 *
758a7889 917 * Function uses Q encoding by default and encodes a string according to RFC
918 * 1522 for use in headers if it contains 8-bit characters or anything that
a24cf710 919 * looks like it should be encoded.
8bd0068d 920 *
758a7889 921 * Function switches to B encoding and encodeHeaderBase64() function, if
922 * string is 8bit and multibyte character set supported by mbstring extension
923 * is used. It can cause E_USER_NOTICE errors, if interface is used with
f270a6eb 924 * multibyte character set unsupported by mbstring extension.
925 *
8bd0068d 926 * @param string $string header string, that has to be encoded
927 * @return string quoted-printable encoded string
f270a6eb 928 * @todo make $mb_charsets system wide constant
8bd0068d 929 */
451f74a2 930function encodeHeader ($string) {
6fbd125b 931 global $default_charset, $languages, $squirrelmail_language;
83be314a 932
10dec454 933 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 934 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
33a55f5a 935 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
83be314a 936 }
793cc001 937
a24cf710 938 // Use B encoding for multibyte charsets
f270a6eb 939 $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
940 if (in_array($default_charset,$mb_charsets) &&
941 in_array($default_charset,sq_mb_list_encodings()) &&
942 sq_is8bit($string)) {
943 return encodeHeaderBase64($string,$default_charset);
944 } elseif (in_array($default_charset,$mb_charsets) &&
945 sq_is8bit($string) &&
946 ! in_array($default_charset,sq_mb_list_encodings())) {
947 // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
948 // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
949 }
a24cf710 950
451f74a2 951 // Encode only if the string contains 8-bit characters or =?
3d8371be 952 $j = strlen($string);
098ea084 953 $max_l = 75 - strlen($default_charset) - 7;
954 $aRet = array();
451f74a2 955 $ret = '';
c96c32f4 956 $iEncStart = $enc_init = false;
0d53f0f9 957 $cur_l = $iOffset = 0;
3d8371be 958 for($i = 0; $i < $j; ++$i) {
c96c32f4 959 switch($string{$i})
960 {
6b76cffa 961 case '"':
8bd0068d 962 case '=':
963 case '<':
964 case '>':
965 case ',':
966 case '?':
967 case '_':
968 if ($iEncStart === false) {
969 $iEncStart = $i;
970 }
971 $cur_l+=3;
972 if ($cur_l > ($max_l-2)) {
973 /* if there is an stringpart that doesn't need encoding, add it */
08b7f7cc 974 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 975 $aRet[] = "=?$default_charset?Q?$ret?=";
976 $iOffset = $i;
977 $cur_l = 0;
978 $ret = '';
979 $iEncStart = false;
08b7f7cc 980 } else {
8bd0068d 981 $ret .= sprintf("=%02X",ord($string{$i}));
c96c32f4 982 }
8bd0068d 983 break;
984 case '(':
985 case ')':
986 if ($iEncStart !== false) {
08b7f7cc 987 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
8bd0068d 988 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 989 $iOffset = $i;
8bd0068d 990 $cur_l = 0;
991 $ret = '';
992 $iEncStart = false;
c96c32f4 993 }
8bd0068d 994 break;
995 case ' ':
c96c32f4 996 if ($iEncStart !== false) {
098ea084 997 $cur_l++;
998 if ($cur_l > $max_l) {
08b7f7cc 999 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
c96c32f4 1000 $aRet[] = "=?$default_charset?Q?$ret?=";
c96c32f4 1001 $iOffset = $i;
1002 $cur_l = 0;
098ea084 1003 $ret = '';
8bd0068d 1004 $iEncStart = false;
08b7f7cc 1005 } else {
8bd0068d 1006 $ret .= '_';
c96c32f4 1007 }
3d8371be 1008 }
8bd0068d 1009 break;
1010 default:
1011 $k = ord($string{$i});
1012 if ($k > 126) {
1013 if ($iEncStart === false) {
1014 // do not start encoding in the middle of a string, also take the rest of the word.
1015 $sLeadString = substr($string,0,$i);
1016 $aLeadString = explode(' ',$sLeadString);
1017 $sToBeEncoded = array_pop($aLeadString);
1018 $iEncStart = $i - strlen($sToBeEncoded);
1019 $ret .= $sToBeEncoded;
1020 $cur_l += strlen($sToBeEncoded);
1021 }
1022 $cur_l += 3;
1023 /* first we add the encoded string that reached it's max size */
1024 if ($cur_l > ($max_l-2)) {
1025 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1026 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
1027 $cur_l = 3;
1028 $ret = '';
1029 $iOffset = $i;
1030 $iEncStart = $i;
1031 }
1032 $enc_init = true;
1033 $ret .= sprintf("=%02X", $k);
1034 } else {
1035 if ($iEncStart !== false) {
1036 $cur_l++;
1037 if ($cur_l > $max_l) {
1038 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1039 $aRet[] = "=?$default_charset?Q?$ret?=";
1040 $iEncStart = false;
1041 $iOffset = $i;
1042 $cur_l = 0;
1043 $ret = '';
1044 } else {
1045 $ret .= $string{$i};
1046 }
1047 }
1048 }
1049 break;
f7b3ba37 1050 }
451f74a2 1051 }
793cc001 1052
c96c32f4 1053 if ($enc_init) {
1054 if ($iEncStart !== false) {
1055 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
1056 $aRet[] = "=?$default_charset?Q?$ret?=";
1057 } else {
1058 $aRet[] = substr($string,$iOffset);
1059 }
1060 $string = implode('',$aRet);
451f74a2 1061 }
3d8371be 1062 return $string;
451f74a2 1063}
b74ba498 1064
f270a6eb 1065/**
1066 * Encodes string according to rfc2047 B encoding header formating rules
1067 *
758a7889 1068 * It is recommended way to encode headers with character sets that store
f270a6eb 1069 * symbols in more than one byte.
1070 *
1071 * Function requires mbstring support. If required mbstring functions are missing,
1072 * function returns false and sets E_USER_WARNING level error message.
1073 *
758a7889 1074 * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
1075 * that mbstring functions will generate E_WARNING errors, if unsupported
f270a6eb 1076 * character set is used. mb_encode_mimeheader function provided by php
1077 * mbstring extension is not used in order to get better control of header
1078 * encoding.
1079 *
758a7889 1080 * Used php code functions - function_exists(), trigger_error(), strlen()
1081 * (is used with charset names and base64 strings). Used php mbstring
f270a6eb 1082 * functions - mb_strlen and mb_substr.
1083 *
758a7889 1084 * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
f270a6eb 1085 * encoding), rfc 2822 (header folding)
1086 *
1087 * @param string $string header string that must be encoded
758a7889 1088 * @param string $charset character set. Must be supported by mbstring extension.
f270a6eb 1089 * Use sq_mb_list_encodings() to detect supported charsets.
1090 * @return string string encoded according to rfc2047 B encoding formating rules
1091 * @since 1.5.1
1092 * @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
1093 * @todo Do we want to control max length of header?
1094 * @todo Do we want to control EOL (end-of-line) marker?
1095 * @todo Do we want to translate error message?
1096 */
1097function encodeHeaderBase64($string,$charset) {
1098 /**
1099 * Check mbstring function requirements.
1100 */
1101 if (! function_exists('mb_strlen') ||
1102 ! function_exists('mb_substr')) {
1103 // set E_USER_WARNING
1104 trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
1105 // return false
1106 return false;
1107 }
1108
1109 // initial return array
1110 $aRet = array();
1111
1112 /**
1113 * header length = 75 symbols max (same as in encodeHeader)
1114 * remove $charset length
1115 * remove =? ? ?= (5 chars)
1116 * remove 2 more chars (\r\n ?)
1117 */
1118 $iMaxLength = 75 - strlen($charset) - 7;
1119
1120 // set first character position
1121 $iStartCharNum = 0;
1122
1123 // loop through all characters. count characters and not bytes.
1124 for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
1125 // encode string from starting character to current character.
1126 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1127
1128 // Check encoded string length
1129 if(strlen($encoded_string)>$iMaxLength) {
1130 // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
1131 $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
1132
1133 // set new starting character
1134 $iStartCharNum = $iCharNum-1;
1135
1136 // encode last char (in case it is last character in string)
1137 $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
1138 } // if string is shorter than max length - add next character
1139 }
1140
1141 // add last encoded string to array
1142 $aRet[] = $encoded_string;
1143
1144 // set initial return string
1145 $sRet = '';
1146
1147 // loop through encoded strings
1148 foreach($aRet as $string) {
1149 // TODO: Do we want to control EOL (end-of-line) marker
1150 if ($sRet!='') $sRet.= " ";
1151
1152 // add header tags and encoded string to return string
1153 $sRet.= '=?'.$charset.'?B?'.$string.'?=';
1154 }
1155
1156 return $sRet;
1157}
1158
691a2d25 1159/* This function trys to locate the entity_id of a specific mime element */
3d8371be 1160function find_ent_id($id, $message) {
a171b359 1161 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
1162 if ($message->entities[$i]->header->type0 == 'multipart') {
3d8371be 1163 $ret = find_ent_id($id, $message->entities[$i]);
451f74a2 1164 } else {
3d8371be 1165 if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
d8cffbab 1166// if (sq_check_save_extension($message->entities[$i])) {
8bd0068d 1167 return $message->entities[$i]->entity_id;
da2415c1 1168// }
c8f5f606 1169 } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
1170 /**
1171 * This is part of a fix for Outlook Express 6.x generating
1172 * cid URLs without creating content-id headers
1173 * @@JA - 20050207
1174 */
1175 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
1176 return $message->entities[$i]->entity_id;
1177 }
3d8371be 1178 }
a3daaaf3 1179 }
451f74a2 1180 }
3d8371be 1181 return $ret;
451f74a2 1182}
a3daaaf3 1183
e5e9381a 1184function sq_check_save_extension($message) {
1185 $filename = $message->getFilename();
1186 $ext = substr($filename, strrpos($filename,'.')+1);
1187 $save_extensions = array('jpg','jpeg','gif','png','bmp');
3d8371be 1188 return in_array($ext, $save_extensions);
e5e9381a 1189}
1190
1191
691a2d25 1192/**
8bd0068d 1193 ** HTMLFILTER ROUTINES
1194 */
451f74a2 1195
2dd879b8 1196/**
0493ed11 1197 * This function checks attribute values for entity-encoded values
1198 * and returns them translated into 8-bit strings so we can run
1199 * checks on them.
8bd0068d 1200 *
0493ed11 1201 * @param $attvalue A string to run entity check against.
1202 * @return Nothing, modifies a reference value.
8bd0068d 1203 */
0493ed11 1204function sq_defang(&$attvalue){
1205 $me = 'sq_defang';
2dd879b8 1206 /**
0493ed11 1207 * Skip this if there aren't ampersands or backslashes.
8bd0068d 1208 */
0493ed11 1209 if (strpos($attvalue, '&') === false
1210 && strpos($attvalue, '\\') === false){
1211 return;
2dd879b8 1212 }
0493ed11 1213 $m = false;
2b665f28 1214 // before deent, translate the dangerous unicode characters and ... to safe values
1215 // otherwise the regular expressions do not match.
1216
1217
1218
0493ed11 1219 do {
1220 $m = false;
1221 $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
1222 $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
1223 $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
1224 } while ($m == true);
1225 $attvalue = stripslashes($attvalue);
2dd879b8 1226}
1227
1228/**
8bd0068d 1229 * Kill any tabs, newlines, or carriage returns. Our friends the
1230 * makers of the browser with 95% market value decided that it'd
1231 * be funny to make "java[tab]script" be just as good as "javascript".
1232 *
1233 * @param attvalue The attribute value before extraneous spaces removed.
0493ed11 1234 * @return attvalue Nothing, modifies a reference value.
8bd0068d 1235 */
0493ed11 1236function sq_unspace(&$attvalue){
1237 $me = 'sq_unspace';
1238 if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
1239 $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
1240 Array('', '', '', '', ''), $attvalue);
2dd879b8 1241 }
2dd879b8 1242}
1243
2b665f28 1244/**
88de4926 1245 * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
2b665f28 1246 * IE as regular characters.
1247 *
1248 * @param attvalue The attribute value before dangerous characters are translated.
1249 * @return attvalue Nothing, modifies a reference value.
1250 * @author Marc Groot Koerkamp.
1251 */
1252function sq_fixIE_idiocy(&$attvalue) {
1253 // remove NUL
1254 $attvalue = str_replace("\0", "", $attvalue);
1255 // remove comments
1256 $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
1257
88de4926 1258 // IE has the evil habit of accepting every possible value for the attribute expression.
1259 // The table below contains characters which are parsed by IE if they are used in the "expression"
2b665f28 1260 // attribute value.
1261 $aDangerousCharsReplacementTable = array(
1262 array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
1263 '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
1264 '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
567dc524 1265 '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
1266 '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
2b665f28 1267 '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
1268 '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
1269 '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
1270 '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
1271 '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
1272 '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
1273 '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
1274 '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
1275 '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
1276 '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
1277 '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
1278 '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
1279 '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
1280 '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
1281 '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
1282 '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
1283 '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
1284 '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
1285 '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
567dc524 1286 "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range
1287 "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
1288 "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
1289 "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
1290 "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
1291 "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
1292 "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
1293 "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
1294 "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
1295 "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
1296 "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
1297 "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
1298 "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
1299 "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
1300 "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
1301 "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
1302 "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
1303 "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
1304 "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
1305 "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
1306 "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
1307 "\xCA\x9F", /* L UNICODE IPA Extension */
1308 "\xCA\x80", /* R UNICODE IPA Extension */
1309 "\xC9\xB4"), /* N UNICODE IPA Extension */
2b665f28 1310 array('l', 'l', 'r','r','n','n',
567dc524 1311 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
1312 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
1313 '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 1314 $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
1315
88de4926 1316 // Escapes are useful for special characters like "{}[]()'&. In other cases they are
1317 // used for XSS.
2b665f28 1318 $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
1319}
1320
691a2d25 1321/**
8bd0068d 1322 * This function returns the final tag out of the tag name, an array
1323 * of attributes, and the type of the tag. This function is called by
1324 * sq_sanitize internally.
1325 *
1326 * @param $tagname the name of the tag.
1327 * @param $attary the array of attributes and their values
1328 * @param $tagtype The type of the tag (see in comments).
1329 * @return a string with the final tag representation.
1330 */
691a2d25 1331function sq_tagprint($tagname, $attary, $tagtype){
b583c3e8 1332 $me = 'sq_tagprint';
3d8371be 1333
691a2d25 1334 if ($tagtype == 2){
1335 $fulltag = '</' . $tagname . '>';
1336 } else {
1337 $fulltag = '<' . $tagname;
1338 if (is_array($attary) && sizeof($attary)){
1339 $atts = Array();
1340 while (list($attname, $attvalue) = each($attary)){
1341 array_push($atts, "$attname=$attvalue");
1342 }
1343 $fulltag .= ' ' . join(" ", $atts);
1344 }
1345 if ($tagtype == 3){
b583c3e8 1346 $fulltag .= ' /';
691a2d25 1347 }
b583c3e8 1348 $fulltag .= '>';
451f74a2 1349 }
691a2d25 1350 return $fulltag;
451f74a2 1351}
a3daaaf3 1352
691a2d25 1353/**
8bd0068d 1354 * A small helper function to use with array_walk. Modifies a by-ref
1355 * value and makes it lowercase.
1356 *
1357 * @param $val a value passed by-ref.
1358 * @return void since it modifies a by-ref value.
1359 */
691a2d25 1360function sq_casenormalize(&$val){
1361 $val = strtolower($val);
1362}
451f74a2 1363
691a2d25 1364/**
8bd0068d 1365 * This function skips any whitespace from the current position within
1366 * a string and to the next non-whitespace value.
1367 *
1368 * @param $body the string
1369 * @param $offset the offset within the string where we should start
1370 * looking for the next non-whitespace character.
1371 * @return the location within the $body where the next
1372 * non-whitespace char is located.
1373 */
691a2d25 1374function sq_skipspace($body, $offset){
b583c3e8 1375 $me = 'sq_skipspace';
3d8371be 1376 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
691a2d25 1377 if (sizeof($matches{1})){
1378 $count = strlen($matches{1});
1379 $offset += $count;
451f74a2 1380 }
691a2d25 1381 return $offset;
451f74a2 1382}
a3daaaf3 1383
691a2d25 1384/**
8bd0068d 1385 * This function looks for the next character within a string. It's
1386 * really just a glorified "strpos", except it catches if failures
1387 * nicely.
1388 *
1389 * @param $body The string to look for needle in.
1390 * @param $offset Start looking from this position.
1391 * @param $needle The character/string to look for.
1392 * @return location of the next occurance of the needle, or
1393 * strlen($body) if needle wasn't found.
1394 */
691a2d25 1395function sq_findnxstr($body, $offset, $needle){
3d8371be 1396 $me = 'sq_findnxstr';
691a2d25 1397 $pos = strpos($body, $needle, $offset);
1398 if ($pos === FALSE){
1399 $pos = strlen($body);
451f74a2 1400 }
691a2d25 1401 return $pos;
451f74a2 1402}
a3daaaf3 1403
691a2d25 1404/**
8bd0068d 1405 * This function takes a PCRE-style regexp and tries to match it
1406 * within the string.
1407 *
1408 * @param $body The string to look for needle in.
1409 * @param $offset Start looking from here.
1410 * @param $reg A PCRE-style regex to match.
1411 * @return Returns a false if no matches found, or an array
1412 * with the following members:
1413 * - integer with the location of the match within $body
1414 * - string with whatever content between offset and the match
1415 * - string with whatever it is we matched
1416 */
691a2d25 1417function sq_findnxreg($body, $offset, $reg){
b583c3e8 1418 $me = 'sq_findnxreg';
691a2d25 1419 $matches = Array();
1420 $retarr = Array();
7d06541f 1421 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1422 if (!isset($matches{0}) || !$matches{0}){
691a2d25 1423 $retarr = false;
1424 } else {
1425 $retarr{0} = $offset + strlen($matches{1});
1426 $retarr{1} = $matches{1};
1427 $retarr{2} = $matches{2};
1428 }
1429 return $retarr;
1430}
a3daaaf3 1431
691a2d25 1432/**
8bd0068d 1433 * This function looks for the next tag.
1434 *
1435 * @param $body String where to look for the next tag.
1436 * @param $offset Start looking from here.
1437 * @return false if no more tags exist in the body, or
1438 * an array with the following members:
1439 * - string with the name of the tag
1440 * - array with attributes and their values
1441 * - integer with tag type (1, 2, or 3)
1442 * - integer where the tag starts (starting "<")
1443 * - integer where the tag ends (ending ">")
1444 * first three members will be false, if the tag is invalid.
1445 */
691a2d25 1446function sq_getnxtag($body, $offset){
b583c3e8 1447 $me = 'sq_getnxtag';
691a2d25 1448 if ($offset > strlen($body)){
1449 return false;
1450 }
1451 $lt = sq_findnxstr($body, $offset, "<");
1452 if ($lt == strlen($body)){
1453 return false;
1454 }
1455 /**
8bd0068d 1456 * We are here:
1457 * blah blah <tag attribute="value">
1458 * \---------^
1459 */
691a2d25 1460 $pos = sq_skipspace($body, $lt+1);
1461 if ($pos >= strlen($body)){
1462 return Array(false, false, false, $lt, strlen($body));
1463 }
1464 /**
8bd0068d 1465 * There are 3 kinds of tags:
1466 * 1. Opening tag, e.g.:
1467 * <a href="blah">
1468 * 2. Closing tag, e.g.:
1469 * </a>
1470 * 3. XHTML-style content-less tag, e.g.:
1471 * <img src="blah" />
1472 */
691a2d25 1473 $tagtype = false;
1474 switch (substr($body, $pos, 1)){
3d8371be 1475 case '/':
1476 $tagtype = 2;
1477 $pos++;
1478 break;
1479 case '!':
1480 /**
8bd0068d 1481 * A comment or an SGML declaration.
1482 */
3d8371be 1483 if (substr($body, $pos+1, 2) == "--"){
1484 $gt = strpos($body, "-->", $pos);
1485 if ($gt === false){
1486 $gt = strlen($body);
1487 } else {
1488 $gt += 2;
1489 }
1490 return Array(false, false, false, $lt, $gt);
bb8d0799 1491 } else {
3d8371be 1492 $gt = sq_findnxstr($body, $pos, ">");
1493 return Array(false, false, false, $lt, $gt);
1494 }
1495 break;
1496 default:
1497 /**
8bd0068d 1498 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1499 * later.
1500 */
3d8371be 1501 $tagtype = 1;
1502 break;
691a2d25 1503 }
a3daaaf3 1504
0493ed11 1505 $tag_start = $pos;
691a2d25 1506 $tagname = '';
1507 /**
8bd0068d 1508 * Look for next [\W-_], which will indicate the end of the tag name.
1509 */
691a2d25 1510 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1511 if ($regary == false){
1512 return Array(false, false, false, $lt, strlen($body));
1513 }
1514 list($pos, $tagname, $match) = $regary;
1515 $tagname = strtolower($tagname);
1516
1517 /**
8bd0068d 1518 * $match can be either of these:
1519 * '>' indicating the end of the tag entirely.
1520 * '\s' indicating the end of the tag name.
1521 * '/' indicating that this is type-3 xhtml tag.
1522 *
1523 * Whatever else we find there indicates an invalid tag.
1524 */
691a2d25 1525 switch ($match){
3d8371be 1526 case '/':
691a2d25 1527 /**
8bd0068d 1528 * This is an xhtml-style tag with a closing / at the
1529 * end, like so: <img src="blah" />. Check if it's followed
1530 * by the closing bracket. If not, then this tag is invalid
1531 */
3d8371be 1532 if (substr($body, $pos, 2) == "/>"){
1533 $pos++;
1534 $tagtype = 3;
1535 } else {
1536 $gt = sq_findnxstr($body, $pos, ">");
1537 $retary = Array(false, false, false, $lt, $gt);
1538 return $retary;
1539 }
1540 case '>':
1541 return Array($tagname, false, $tagtype, $lt, $pos);
1542 break;
1543 default:
1544 /**
8bd0068d 1545 * Check if it's whitespace
1546 */
3d8371be 1547 if (!preg_match('/\s/', $match)){
1548 /**
8bd0068d 1549 * This is an invalid tag! Look for the next closing ">".
1550 */
7d06541f 1551 $gt = sq_findnxstr($body, $lt, ">");
3d8371be 1552 return Array(false, false, false, $lt, $gt);
1553 }
1554 break;
691a2d25 1555 }
3d8371be 1556
691a2d25 1557 /**
8bd0068d 1558 * At this point we're here:
1559 * <tagname attribute='blah'>
1560 * \-------^
1561 *
1562 * At this point we loop in order to find all attributes.
1563 */
691a2d25 1564 $attname = '';
0493ed11 1565 $atttype = false;
691a2d25 1566 $attary = Array();
1567
1568 while ($pos <= strlen($body)){
1569 $pos = sq_skipspace($body, $pos);
1570 if ($pos == strlen($body)){
1571 /**
8bd0068d 1572 * Non-closed tag.
1573 */
691a2d25 1574 return Array(false, false, false, $lt, $pos);
1575 }
1576 /**
8bd0068d 1577 * See if we arrived at a ">" or "/>", which means that we reached
1578 * the end of the tag.
1579 */
691a2d25 1580 $matches = Array();
164800ad 1581 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
c828931c 1582 /**
8bd0068d 1583 * Yep. So we did.
1584 */
c828931c 1585 $pos += strlen($matches{1});
1586 if ($matches{2} == "/>"){
1587 $tagtype = 3;
1588 $pos++;
1589 }
1590 return Array($tagname, $attary, $tagtype, $lt, $pos);
1591 }
a3daaaf3 1592
cca46357 1593 /**
8bd0068d 1594 * There are several types of attributes, with optional
1595 * [:space:] between members.
1596 * Type 1:
1597 * attrname[:space:]=[:space:]'CDATA'
1598 * Type 2:
1599 * attrname[:space:]=[:space:]"CDATA"
1600 * Type 3:
1601 * attr[:space:]=[:space:]CDATA
1602 * Type 4:
1603 * attrname
1604 *
1605 * We leave types 1 and 2 the same, type 3 we check for
1606 * '"' and convert to "&quot" if needed, then wrap in
1607 * double quotes. Type 4 we convert into:
1608 * attrname="yes".
1609 */
3f7c623f 1610 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
691a2d25 1611 if ($regary == false){
1612 /**
8bd0068d 1613 * Looks like body ended before the end of tag.
1614 */
691a2d25 1615 return Array(false, false, false, $lt, strlen($body));
cca46357 1616 }
691a2d25 1617 list($pos, $attname, $match) = $regary;
1618 $attname = strtolower($attname);
1619 /**
8bd0068d 1620 * We arrived at the end of attribute name. Several things possible
1621 * here:
1622 * '>' means the end of the tag and this is attribute type 4
1623 * '/' if followed by '>' means the same thing as above
1624 * '\s' means a lot of things -- look what it's followed by.
1625 * anything else means the attribute is invalid.
1626 */
691a2d25 1627 switch($match){
3d8371be 1628 case '/':
691a2d25 1629 /**
8bd0068d 1630 * This is an xhtml-style tag with a closing / at the
1631 * end, like so: <img src="blah" />. Check if it's followed
1632 * by the closing bracket. If not, then this tag is invalid
1633 */
3d8371be 1634 if (substr($body, $pos, 2) == "/>"){
691a2d25 1635 $pos++;
3d8371be 1636 $tagtype = 3;
691a2d25 1637 } else {
3d8371be 1638 $gt = sq_findnxstr($body, $pos, ">");
1639 $retary = Array(false, false, false, $lt, $gt);
1640 return $retary;
1641 }
1642 case '>':
1643 $attary{$attname} = '"yes"';
1644 return Array($tagname, $attary, $tagtype, $lt, $pos);
1645 break;
1646 default:
1647 /**
8bd0068d 1648 * Skip whitespace and see what we arrive at.
1649 */
3d8371be 1650 $pos = sq_skipspace($body, $pos);
1651 $char = substr($body, $pos, 1);
1652 /**
8bd0068d 1653 * Two things are valid here:
1654 * '=' means this is attribute type 1 2 or 3.
1655 * \w means this was attribute type 4.
1656 * anything else we ignore and re-loop. End of tag and
1657 * invalid stuff will be caught by our checks at the beginning
1658 * of the loop.
1659 */
3d8371be 1660 if ($char == "="){
1661 $pos++;
1662 $pos = sq_skipspace($body, $pos);
691a2d25 1663 /**
8bd0068d 1664 * Here are 3 possibilities:
1665 * "'" attribute type 1
1666 * '"' attribute type 2
1667 * everything else is the content of tag type 3
1668 */
3d8371be 1669 $quot = substr($body, $pos, 1);
1670 if ($quot == "'"){
1671 $regary = sq_findnxreg($body, $pos+1, "\'");
1672 if ($regary == false){
1673 return Array(false, false, false, $lt, strlen($body));
1674 }
1675 list($pos, $attval, $match) = $regary;
1676 $pos++;
1677 $attary{$attname} = "'" . $attval . "'";
1678 } else if ($quot == '"'){
1679 $regary = sq_findnxreg($body, $pos+1, '\"');
1680 if ($regary == false){
1681 return Array(false, false, false, $lt, strlen($body));
1682 }
1683 list($pos, $attval, $match) = $regary;
1684 $pos++;
1685 $attary{$attname} = '"' . $attval . '"';
1686 } else {
1687 /**
8bd0068d 1688 * These are hateful. Look for \s, or >.
1689 */
3d8371be 1690 $regary = sq_findnxreg($body, $pos, "[\s>]");
1691 if ($regary == false){
1692 return Array(false, false, false, $lt, strlen($body));
1693 }
1694 list($pos, $attval, $match) = $regary;
1695 /**
8bd0068d 1696 * If it's ">" it will be caught at the top.
1697 */
3d8371be 1698 $attval = preg_replace("/\"/s", "&quot;", $attval);
1699 $attary{$attname} = '"' . $attval . '"';
7e235a1a 1700 }
3d8371be 1701 } else if (preg_match("|[\w/>]|", $char)) {
691a2d25 1702 /**
8bd0068d 1703 * That was attribute type 4.
1704 */
3d8371be 1705 $attary{$attname} = '"yes"';
1706 } else {
1707 /**
8bd0068d 1708 * An illegal character. Find next '>' and return.
1709 */
3d8371be 1710 $gt = sq_findnxstr($body, $pos, ">");
1711 return Array(false, false, false, $lt, $gt);
451f74a2 1712 }
3d8371be 1713 break;
691a2d25 1714 }
1715 }
1716 /**
8bd0068d 1717 * The fact that we got here indicates that the tag end was never
1718 * found. Return invalid tag indication so it gets stripped.
1719 */
691a2d25 1720 return Array(false, false, false, $lt, strlen($body));
1721}
1722
1723/**
0493ed11 1724 * Translates entities into literal values so they can be checked.
8bd0068d 1725 *
0493ed11 1726 * @param $attvalue the by-ref value to check.
1727 * @param $regex the regular expression to check against.
1728 * @param $hex whether the entites are hexadecimal.
1729 * @return True or False depending on whether there were matches.
8bd0068d 1730 */
0493ed11 1731function sq_deent(&$attvalue, $regex, $hex=false){
b583c3e8 1732 $me = 'sq_deent';
0493ed11 1733 $ret_match = false;
2b665f28 1734 // remove comments
1735 //$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
0493ed11 1736 preg_match_all($regex, $attvalue, $matches);
1737 if (is_array($matches) && sizeof($matches[0]) > 0){
1738 $repl = Array();
1739 for ($i = 0; $i < sizeof($matches[0]); $i++){
1740 $numval = $matches[1][$i];
1741 if ($hex){
1742 $numval = hexdec($numval);
a3daaaf3 1743 }
0493ed11 1744 $repl{$matches[0][$i]} = chr($numval);
691a2d25 1745 }
0493ed11 1746 $attvalue = strtr($attvalue, $repl);
1747 return true;
1748 } else {
1749 return false;
691a2d25 1750 }
691a2d25 1751}
1752
1753/**
8bd0068d 1754 * This function runs various checks against the attributes.
1755 *
1756 * @param $tagname String with the name of the tag.
1757 * @param $attary Array with all tag attributes.
1758 * @param $rm_attnames See description for sq_sanitize
1759 * @param $bad_attvals See description for sq_sanitize
1760 * @param $add_attr_to_tag See description for sq_sanitize
1761 * @param $message message object
1762 * @param $id message id
1763 * @return Array with modified attributes.
1764 */
da2415c1 1765function sq_fixatts($tagname,
1766 $attary,
691a2d25 1767 $rm_attnames,
1768 $bad_attvals,
1769 $add_attr_to_tag,
1770 $message,
b3af12ef 1771 $id,
3d8371be 1772 $mailbox
691a2d25 1773 ){
b583c3e8 1774 $me = 'sq_fixatts';
691a2d25 1775 while (list($attname, $attvalue) = each($attary)){
1776 /**
8bd0068d 1777 * See if this attribute should be removed.
1778 */
691a2d25 1779 foreach ($rm_attnames as $matchtag=>$matchattrs){
1780 if (preg_match($matchtag, $tagname)){
1781 foreach ($matchattrs as $matchattr){
1782 if (preg_match($matchattr, $attname)){
1783 unset($attary{$attname});
1784 continue;
1785 }
451f74a2 1786 }
451f74a2 1787 }
691a2d25 1788 }
2b665f28 1789 /**
1790 * Workaround for IE quirks
1791 */
1792 sq_fixIE_idiocy($attvalue);
1793
691a2d25 1794 /**
8bd0068d 1795 * Remove any backslashes, entities, and extraneous whitespace.
1796 */
2b665f28 1797
1798 $oldattvalue = $attvalue;
0493ed11 1799 sq_defang($attvalue);
2b665f28 1800 if ($attname == 'style' && $attvalue !== $oldattvalue) {
1801 // entities are used in the attribute value. In 99% of the cases it's there as XSS
1802 // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
1803 $attvalue = "idiocy";
1804 $attary{$attname} = $attvalue;
1805 }
0493ed11 1806 sq_unspace($attvalue);
af861a34 1807
691a2d25 1808 /**
8bd0068d 1809 * Now let's run checks on the attvalues.
1810 * I don't expect anyone to comprehend this. If you do,
1811 * get in touch with me so I can drive to where you live and
1812 * shake your hand personally. :)
1813 */
691a2d25 1814 foreach ($bad_attvals as $matchtag=>$matchattrs){
1815 if (preg_match($matchtag, $tagname)){
1816 foreach ($matchattrs as $matchattr=>$valary){
1817 if (preg_match($matchattr, $attname)){
1818 /**
8bd0068d 1819 * There are two arrays in valary.
1820 * First is matches.
1821 * Second one is replacements
1822 */
691a2d25 1823 list($valmatch, $valrepl) = $valary;
da2415c1 1824 $newvalue =
691a2d25 1825 preg_replace($valmatch, $valrepl, $attvalue);
1826 if ($newvalue != $attvalue){
1827 $attary{$attname} = $newvalue;
567dc524 1828 $attvalue = $newvalue;
691a2d25 1829 }
1830 }
1831 }
451f74a2 1832 }
a3daaaf3 1833 }
567dc524 1834 if ($attname == 'style') {
1835 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1836 // 8bit and control characters in style attribute values can be used for XSS, remove them
1837 $attary{$attname} = '"disallowed character"';
1838 }
1839 preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
1840 if (count($aMatch)) {
1841 foreach($aMatch[1] as $sMatch) {
1842 // url value
1843 $urlvalue = $sMatch;
1844 sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
1845 $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
1846 }
1847 }
691a2d25 1848 }
ff940ebc 1849 /**
567dc524 1850 * Use white list based filtering on attributes which can contain url's
ff940ebc 1851 */
567dc524 1852 else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
1853 sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
1854 $attary{$attname} = $attvalue;
ff940ebc 1855 }
a3daaaf3 1856 }
691a2d25 1857 /**
8bd0068d 1858 * See if we need to append any attributes to this tag.
1859 */
691a2d25 1860 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1861 if (preg_match($matchtag, $tagname)){
1862 $attary = array_merge($attary, $addattary);
1863 }
1864 }
1865 return $attary;
451f74a2 1866}
a3daaaf3 1867
567dc524 1868/**
1869 * This function filters url's
1870 *
1871 * @param $attvalue String with attribute value to filter
1872 * @param $message message object
1873 * @param $id message id
1874 * @param $mailbox mailbox
1875 * @param $sQuote quoting characters around url's
1876 */
1877function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
1878 $attvalue = trim($attvalue);
1879 if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
1880 // remove the double quotes
1881 $sQuote = $attvalue[0];
1882 $attvalue = trim(substr($attvalue,1,-1));
1883 }
1884
d31f73f1 1885 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
1886 // images off by default.
afbf184c 1887 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
d31f73f1 1888
567dc524 1889 $secremoveimg = '../images/' . _("sec_remove_eng.png");
1890
1891 /**
1892 * Replace empty src tags with the blank image. src is only used
1893 * for frames, images, and image inputs. Doing a replace should
1894 * not affect them working as should be, however it will stop
1895 * IE from being kicked off when src for img tags are not set
1896 */
1897 if ($attvalue == '') {
1898 $attvalue = '"' . SM_PATH . 'images/blank.png"';
1899 } else {
1900 // first, disallow 8 bit characters and control characters
1901 if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
1902 switch ($attname) {
1903 case 'href':
1904 $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
1905 break;
1906 default:
1907 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1908 break;
1909 }
1910 } else {
1911 $aUrl = parse_url($attvalue);
1912 if (isset($aUrl['scheme'])) {
1913 switch(strtolower($aUrl['scheme'])) {
d75e755b 1914 case 'mailto':
567dc524 1915 case 'http':
1916 case 'https':
1917 case 'ftp':
1918 if ($attname != 'href') {
1919 if ($view_unsafe_images == false) {
1920 $attvalue = $sQuote . $secremoveimg . $sQuote;
1921 } else {
1922 if (isset($aUrl['path'])) {
8bbbc757 1923
1924 // No one has been able to show that image URIs
1925 // can be exploited, so for now, no restrictions
1926 // are made at all. If this proves to be a problem,
1927 // the commented-out code below can be of help.
1928 // (One consideration is that I see nothing in this
1929 // function that specifically says that we will
1930 // only ever arrive here when inspecting an image
1931 // tag, although that does seem to be the end
1932 // result - e.g., <script src="..."> where malicious
1933 // image URIs are in fact a problem are already
1934 // filtered out elsewhere.
1935 /* ---------------------------------
567dc524 1936 // validate image extension.
1937 $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
1938 if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
8bbbc757 1939 // If URI is to something other than
1940 // a regular image file, get the contents
1941 // and try to see if it is an image.
1942 // Don't use Fileinfo (finfo_file()) because
1943 // we'd need to make the admin configure the
1944 // location of the magic.mime file (FIXME: add finfo_file() support later?)
1945 //
1946 $mime_type = '';
1947 if (function_exists('mime_content_type')
1948 && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
1949
1950 // fetch file
1951 //
1952 $file_contents = '';
1953 while (!feof($FILE)) {
1954 $file_contents .= fread($FILE, 8192);
1955 }
1956 fclose($FILE);
1957
1958 // store file locally
1959 //
1960 global $attachment_dir, $username;
1961 $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
1962 $localfilename = GenerateRandomString(32, '', 7);
1963 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1964 while (file_exists($full_localfilename)) {
1965 $localfilename = GenerateRandomString(32, '', 7);
1966 $full_localfilename = "$hashed_attachment_dir/$localfilename";
1967 }
1968 $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
1969 fwrite($FILE, $file_contents);
1970 fclose($FILE);
1971
1972 // get mime type and remove file
1973 //
1974 $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
1975 unlink("$hashed_attachment_dir/$localfilename");
1976 }
1977 // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
1978 if (substr(strtolower($mime_type), 0, 5) != 'image') {
1979 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1980 }
567dc524 1981 }
8bbbc757 1982 --------------------------------- */
567dc524 1983 } else {
1984 $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
1985 }
1986 }
cf088f55 1987 } else {
1988 $attvalue = $sQuote . $attvalue . $sQuote;
567dc524 1989 }
1990 break;
1991 case 'outbind':
1992 /**
1993 * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
1994 * One day MS might actually make it match something useful, for now, falling
1995 * back to using cid2http, so we can grab the blank.png.
1996 */
cf088f55 1997 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 1998 break;
1999 case 'cid':
2000 /**
2001 * Turn cid: urls into http-friendly ones.
2002 */
cf088f55 2003 $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
567dc524 2004 break;
2005 default:
2006 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2007 break;
2008 }
2009 } else {
2010 if (!(isset($aUrl['path']) && $aUrl['path'] == $secremoveimg)) {
2011 // parse_url did not lead to satisfying result
2012 $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
2013 }
2014 }
2015 }
2016 }
2017}
2018
691a2d25 2019/**
8bd0068d 2020 * This function edits the style definition to make them friendly and
2021 * usable in SquirrelMail.
2022 *
2023 * @param $message the message object
2024 * @param $id the message id
2025 * @param $content a string with whatever is between <style> and </style>
2026 * @param $mailbox the message mailbox
2027 * @return a string with edited content.
2028 */
e60a299a 2029function sq_fixstyle($body, $pos, $message, $id, $mailbox){
b583c3e8 2030 $me = 'sq_fixstyle';
7e2ff844 2031 // workaround for </style> in between comments
2032 $iCurrentPos = $pos;
2033 $content = '';
2034 $sToken = '';
2035 $bSucces = false;
2036 $bEndTag = false;
2037 for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
2038 $char = $body{$i};
2039 switch ($char) {
2040 case '<':
10c0caeb 2041 $sToken = $char;
7e2ff844 2042 break;
2043 case '/':
2044 if ($sToken == '<') {
2045 $sToken .= $char;
2046 $bEndTag = true;
2047 } else {
2048 $content .= $char;
2049 }
2050 break;
2051 case '>':
2052 if ($bEndTag) {
2053 $sToken .= $char;
2054 if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
2055 $newpos = $i + 1;
2056 $bSucces = true;
2057 break 2;
2058 } else {
2059 $content .= $sToken;
2060 }
2061 $bEndTag = false;
2062 } else {
2063 $content .= $char;
2064 }
2065 break;
2066 case '!':
2067 if ($sToken == '<') {
2068 // possible comment
2069 if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
2070 $i = strpos($body,'-->',$i+3);
2b665f28 2071 if ($i === false) { // no end comment
2072 $i = strlen($body);
2073 }
7e2ff844 2074 $sToken = '';
2075 }
2076 } else {
2077 $content .= $char;
2078 }
2079 break;
2080 default:
2081 if ($bEndTag) {
2082 $sToken .= $char;
2083 } else {
2084 $content .= $char;
2085 }
2086 break;
2087 }
2088 }
2089 if ($bSucces == FALSE){
7d06541f 2090 return array(FALSE, strlen($body));
2091 }
7e2ff844 2092
2b665f28 2093
2094
691a2d25 2095 /**
9ebace19 2096 * First look for general BODY style declaration, which would be
2097 * like so:
2098 * body {background: blah-blah}
2099 * and change it to .bodyclass so we can just assign it to a <div>
2100 */
691a2d25 2101 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
3d8371be 2102 $secremoveimg = '../images/' . _("sec_remove_eng.png");
691a2d25 2103 /**
0493ed11 2104 * Fix url('blah') declarations.
2105 */
2106 // $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
2107 // "url(\\1$secremoveimg\\2)", $content);
2b665f28 2108
567dc524 2109 // first check for 8bit sequences and disallowed control characters
2110 if (preg_match('/[\16-\37\200-\377]+/',$content)) {
2111 $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
2112 return array($content, $newpos);
2113 }
2114
2b665f28 2115 // IE Sucks hard. We have a special function for it.
2116 sq_fixIE_idiocy($content);
2117
2118 // remove @import line
2119 $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
2120
5b4884be 2121 // translate ur\l and variations (IE parses that)
2b665f28 2122 // TODO check if the sq_fixIE_idiocy function already handles this.
5b4884be 2123 $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
567dc524 2124 preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
2125 if (count($aMatch)) {
2126 $aValue = $aReplace = array();
2127 foreach($aMatch[1] as $sMatch) {
2128 // url value
2129 $urlvalue = $sMatch;
2130 sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
2131 $aValue[] = $sMatch;
2132 $aReplace[] = $urlvalue;
0493ed11 2133 }
567dc524 2134 $content = str_replace($aValue,$aReplace,$content);
691a2d25 2135 }
567dc524 2136
9ebace19 2137 /**
2138 * Remove any backslashes, entities, and extraneous whitespace.
2139 */
0493ed11 2140 $contentTemp = $content;
2141 sq_defang($contentTemp);
2142 sq_unspace($contentTemp);
a3daaaf3 2143
691a2d25 2144 /**
8bd0068d 2145 * Fix stupid css declarations which lead to vulnerabilities
2146 * in IE.
39352565 2147 *
2148 * Also remove "position" attribute, as it can easily be set
2149 * to "fixed" or "absolute" with "left" and "top" attributes
2150 * of zero, taking over the whole content frame. It can also
2151 * be set to relative and move itself anywhere it wants to,
2152 * displaying content in areas it shouldn't be allowed to touch.
8bd0068d 2153 */
5db90261 2154 $match = Array('/\/\*.*\*\//',
2155 '/expression/i',
0493ed11 2156 '/behaviou*r/i',
2157 '/binding/i',
2b665f28 2158 '/include-source/i',
2159 '/javascript/i',
39352565 2160 '/script/i',
2161 '/position/i');
2162 $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
0493ed11 2163 $contentNew = preg_replace($match, $replace, $contentTemp);
2164 if ($contentNew !== $contentTemp) {
2165 // insecure css declarations are used. From now on we don't care
2166 // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
2167 $content = $contentNew;
2168 }
7d06541f 2169 return array($content, $newpos);
691a2d25 2170}
a3daaaf3 2171
0493ed11 2172
691a2d25 2173/**
8bd0068d 2174 * This function converts cid: url's into the ones that can be viewed in
2175 * the browser.
2176 *
2177 * @param $message the message object
2178 * @param $id the message id
2179 * @param $cidurl the cid: url.
2180 * @param $mailbox the message mailbox
2181 * @return a string with a http-friendly url
2182 */
b3af12ef 2183function sq_cid2http($message, $id, $cidurl, $mailbox){
691a2d25 2184 /**
8bd0068d 2185 * Get rid of quotes.
2186 */
691a2d25 2187 $quotchar = substr($cidurl, 0, 1);
2dd879b8 2188 if ($quotchar == '"' || $quotchar == "'"){
2189 $cidurl = str_replace($quotchar, "", $cidurl);
2190 } else {
2191 $quotchar = '';
2192 }
691a2d25 2193 $cidurl = substr(trim($cidurl), 4);
0493ed11 2194
2195 $match_str = '/\{.*?\}\//';
2196 $str_rep = '';
2197 $cidurl = preg_replace($match_str, $str_rep, $cidurl);
2198
e5e9381a 2199 $linkurl = find_ent_id($cidurl, $message);
9ebace19 2200 /* in case of non-safe cid links $httpurl should be replaced by a sort of
2201 unsafe link image */
e5e9381a 2202 $httpurl = '';
c8f5f606 2203
8bd0068d 2204 /**
2205 * This is part of a fix for Outlook Express 6.x generating
2206 * cid URLs without creating content-id headers. These images are
2207 * not part of the multipart/related html mail. The html contains
2208 * <img src="cid:{some_id}/image_filename.ext"> references to
2209 * attached images with as goal to render them inline although
2210 * the attachment disposition property is not inline.
2211 */
c8f5f606 2212
2213 if (empty($linkurl)) {
2214 if (preg_match('/{.*}\//', $cidurl)) {
2215 $cidurl = preg_replace('/{.*}\//','', $cidurl);
2216 if (!empty($cidurl)) {
2217 $linkurl = find_ent_id($cidurl, $message);
2218 }
2219 }
2220 }
f8a1ed5a 2221
c8f5f606 2222 if (!empty($linkurl)) {
fa26ab45 2223 $httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&amp;' .
8bd0068d 2224 "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
2225 '&amp;ent_id=' . $linkurl . $quotchar;
c8f5f606 2226 } else {
2227 /**
2228 * If we couldn't generate a proper img url, drop in a blank image
2229 * instead of sending back empty, otherwise it causes unusual behaviour
2230 */
bc017c1d 2231 $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
e5e9381a 2232 }
f8a1ed5a 2233
691a2d25 2234 return $httpurl;
2235}
2236
2237/**
8bd0068d 2238 * This function changes the <body> tag into a <div> tag since we
2239 * can't really have a body-within-body.
2240 *
2241 * @param $attary an array of attributes and values of <body>
2242 * @param $mailbox mailbox we're currently reading (for cid2http)
2243 * @param $message current message (for cid2http)
2244 * @param $id current message id (for cid2http)
2245 * @return a modified array of attributes to be set for <div>
2246 */
2dd879b8 2247function sq_body2div($attary, $mailbox, $message, $id){
b583c3e8 2248 $me = 'sq_body2div';
3d8371be 2249 $divattary = Array('class' => "'bodyclass'");
b583c3e8 2250 $text = '#000000';
c189a963 2251 $has_bgc_stl = $has_txt_stl = false;
b583c3e8 2252 $styledef = '';
691a2d25 2253 if (is_array($attary) && sizeof($attary) > 0){
2254 foreach ($attary as $attname=>$attvalue){
2255 $quotchar = substr($attvalue, 0, 1);
2256 $attvalue = str_replace($quotchar, "", $attvalue);
2257 switch ($attname){
3d8371be 2258 case 'background':
8bd0068d 2259 $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
3d8371be 2260 $styledef .= "background-image: url('$attvalue'); ";
2261 break;
2262 case 'bgcolor':
c189a963 2263 $has_bgc_stl = true;
3d8371be 2264 $styledef .= "background-color: $attvalue; ";
2265 break;
2266 case 'text':
c189a963 2267 $has_txt_stl = true;
3d8371be 2268 $styledef .= "color: $attvalue; ";
2269 break;
691a2d25 2270 }
a3daaaf3 2271 }
c189a963 2272 // Outlook defines a white bgcolor and no text color. This can lead to
2273 // white text on a white bg with certain themes.
2274 if ($has_bgc_stl && !$has_txt_stl) {
2275 $styledef .= "color: $text; ";
2276 }
691a2d25 2277 if (strlen($styledef) > 0){
2278 $divattary{"style"} = "\"$styledef\"";
2279 }
2280 }
2281 return $divattary;
2282}
a3daaaf3 2283
691a2d25 2284/**
8bd0068d 2285 * This is the main function and the one you should actually be calling.
2286 * There are several variables you should be aware of an which need
2287 * special description.
2288 *
2289 * Since the description is quite lengthy, see it here:
2290 * http://linux.duke.edu/projects/mini/htmlfilter/
2291 *
2292 * @param $body the string with HTML you wish to filter
2293 * @param $tag_list see description above
2294 * @param $rm_tags_with_content see description above
2295 * @param $self_closing_tags see description above
2296 * @param $force_tag_closing see description above
2297 * @param $rm_attnames see description above
2298 * @param $bad_attvals see description above
2299 * @param $add_attr_to_tag see description above
2300 * @param $message message object
2301 * @param $id message id
2302 * @return sanitized html safe to show on your pages.
2303 */
da2415c1 2304function sq_sanitize($body,
8bd0068d 2305 $tag_list,
2306 $rm_tags_with_content,
2307 $self_closing_tags,
2308 $force_tag_closing,
2309 $rm_attnames,
2310 $bad_attvals,
2311 $add_attr_to_tag,
2312 $message,
2313 $id,
2314 $mailbox
2315 ){
b583c3e8 2316 $me = 'sq_sanitize';
7d06541f 2317 $rm_tags = array_shift($tag_list);
691a2d25 2318 /**
8bd0068d 2319 * Normalize rm_tags and rm_tags_with_content.
2320 */
7d06541f 2321 @array_walk($tag_list, 'sq_casenormalize');
691a2d25 2322 @array_walk($rm_tags_with_content, 'sq_casenormalize');
2323 @array_walk($self_closing_tags, 'sq_casenormalize');
2324 /**
8bd0068d 2325 * See if tag_list is of tags to remove or tags to allow.
2326 * false means remove these tags
2327 * true means allow these tags
2328 */
691a2d25 2329 $curpos = 0;
2330 $open_tags = Array();
2dd879b8 2331 $trusted = "\n<!-- begin sanitized html -->\n";
691a2d25 2332 $skip_content = false;
bb8d0799 2333 /**
8bd0068d 2334 * Take care of netscape's stupid javascript entities like
2335 * &{alert('boo')};
2336 */
bb8d0799 2337 $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
691a2d25 2338
7d06541f 2339 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
691a2d25 2340 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
2341 $free_content = substr($body, $curpos, $lt-$curpos);
2342 /**
8bd0068d 2343 * Take care of <style>
2344 */
7d06541f 2345 if ($tagname == "style" && $tagtype == 1){
da2415c1 2346 list($free_content, $curpos) =
e60a299a 2347 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
7d06541f 2348 if ($free_content != FALSE){
2349 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2350 $trusted .= $free_content;
2351 $trusted .= sq_tagprint($tagname, false, 2);
2352 }
2353 continue;
691a2d25 2354 }
2355 if ($skip_content == false){
2356 $trusted .= $free_content;
691a2d25 2357 }
2358 if ($tagname != FALSE){
2359 if ($tagtype == 2){
2360 if ($skip_content == $tagname){
2361 /**
8bd0068d 2362 * Got to the end of tag we needed to remove.
2363 */
691a2d25 2364 $tagname = false;
2365 $skip_content = false;
2366 } else {
2367 if ($skip_content == false){
c828931c 2368 if ($tagname == "body"){
2369 $tagname = "div";
2dd879b8 2370 }
da2415c1 2371 if (isset($open_tags{$tagname}) &&
8bd0068d 2372 $open_tags{$tagname} > 0){
2dd879b8 2373 $open_tags{$tagname}--;
691a2d25 2374 } else {
2dd879b8 2375 $tagname = false;
691a2d25 2376 }
691a2d25 2377 }
2378 }
2379 } else {
2380 /**
8bd0068d 2381 * $rm_tags_with_content
2382 */
691a2d25 2383 if ($skip_content == false){
2384 /**
8bd0068d 2385 * See if this is a self-closing type and change
2386 * tagtype appropriately.
2387 */
691a2d25 2388 if ($tagtype == 1
8bd0068d 2389 && in_array($tagname, $self_closing_tags)){
2dd879b8 2390 $tagtype = 3;
691a2d25 2391 }
2392 /**
8bd0068d 2393 * See if we should skip this tag and any content
2394 * inside it.
2395 */
691a2d25 2396 if ($tagtype == 1 &&
8bd0068d 2397 in_array($tagname, $rm_tags_with_content)){
691a2d25 2398 $skip_content = $tagname;
2399 } else {
da2415c1 2400 if (($rm_tags == false
8bd0068d 2401 && in_array($tagname, $tag_list)) ||
2402 ($rm_tags == true &&
2403 !in_array($tagname, $tag_list))){
691a2d25 2404 $tagname = false;
2405 } else {
2dd879b8 2406 /**
8bd0068d 2407 * Convert body into div.
2408 */
2dd879b8 2409 if ($tagname == "body"){
2410 $tagname = "div";
da2415c1 2411 $attary = sq_body2div($attary, $mailbox,
8bd0068d 2412 $message, $id);
2dd879b8 2413 }
691a2d25 2414 if ($tagtype == 1){
2415 if (isset($open_tags{$tagname})){
2416 $open_tags{$tagname}++;
2417 } else {
2418 $open_tags{$tagname}=1;
2419 }
2420 }
2421 /**
8bd0068d 2422 * This is where we run other checks.
2423 */
691a2d25 2424 if (is_array($attary) && sizeof($attary) > 0){
2425 $attary = sq_fixatts($tagname,
8bd0068d 2426 $attary,
2427 $rm_attnames,
2428 $bad_attvals,
2429 $add_attr_to_tag,
2430 $message,
2431 $id,
2432 $mailbox
2433 );
691a2d25 2434 }
2435 }
2436 }
691a2d25 2437 }
2438 }
2439 if ($tagname != false && $skip_content == false){
2440 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
2441 }
691a2d25 2442 }
2443 $curpos = $gt+1;
a3daaaf3 2444 }
691a2d25 2445 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
2446 if ($force_tag_closing == true){
2447 foreach ($open_tags as $tagname=>$opentimes){
2448 while ($opentimes > 0){
2449 $trusted .= '</' . $tagname . '>';
2450 $opentimes--;
2451 }
2452 }
2453 $trusted .= "\n";
2454 }
2455 $trusted .= "<!-- end sanitized html -->\n";
2456 return $trusted;
2457}
451f74a2 2458
691a2d25 2459/**
8bd0068d 2460 * This is a wrapper function to call html sanitizing routines.
2461 *
2462 * @param $body the body of the message
2463 * @param $id the id of the message
c189a963 2464
2465 * @param $message
2466 * @param $mailbox
2467 * @param boolean $take_mailto_links When TRUE, converts mailto: links
2468 * into internal SM compose links
2469 * (optional; default = TRUE)
8bd0068d 2470 * @return a string with html safe to display in the browser.
2471 */
c189a963 2472function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
2473
202bcbcc 2474 // require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
c189a963 2475
691a2d25 2476 global $attachment_common_show_images, $view_unsafe_images,
8bd0068d 2477 $has_unsafe_images;
691a2d25 2478 /**
8bd0068d 2479 * Don't display attached images in HTML mode.
2b665f28 2480 *
d0187bd6 2481 * SB: why?
8bd0068d 2482 */
691a2d25 2483 $attachment_common_show_images = false;
2484 $tag_list = Array(
8bd0068d 2485 false,
2486 "object",
2487 "meta",
2488 "html",
2489 "head",
2490 "base",
2491 "link",
2492 "frame",
2493 "iframe",
2494 "plaintext",
2495 "marquee"
2496 );
691a2d25 2497
2498 $rm_tags_with_content = Array(
8bd0068d 2499 "script",
2500 "applet",
2501 "embed",
2502 "title",
2503 "frameset",
0493ed11 2504 "xmp",
8bd0068d 2505 "xml"
2506 );
691a2d25 2507
2508 $self_closing_tags = Array(
8bd0068d 2509 "img",
2510 "br",
2511 "hr",
2512 "input",
2513 "outbind"
2514 );
691a2d25 2515
2dd879b8 2516 $force_tag_closing = true;
691a2d25 2517
2518 $rm_attnames = Array(
8bd0068d 2519 "/.*/" =>
2520 Array(
2521 "/target/i",
2522 "/^on.*/i",
2523 "/^dynsrc/i",
2524 "/^data.*/i",
2525 "/^lowsrc.*/i"
2526 )
2527 );
691a2d25 2528
2529 $secremoveimg = "../images/" . _("sec_remove_eng.png");
2530 $bad_attvals = Array(
8bd0068d 2531 "/.*/" =>
691a2d25 2532 Array(
0a6ec9b5 2533 "/^src|background/i" =>
8bd0068d 2534 Array(
691a2d25 2535 Array(
8bd0068d 2536 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2537 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2538 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
691a2d25 2539 ),
8bd0068d 2540 Array(
2541 "\\1$secremoveimg\\2",
2542 "\\1$secremoveimg\\2",
2543 "\\1$secremoveimg\\2",
8bd0068d 2544 )
2545 ),
0a6ec9b5 2546 "/^href|action/i" =>
8bd0068d 2547 Array(
0a6ec9b5 2548 Array(
8bd0068d 2549 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
2550 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
2551 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
0a6ec9b5 2552 ),
691a2d25 2553 Array(
8bd0068d 2554 "\\1#\\1",
2555 "\\1#\\1",
2556 "\\1#\\1"
02474e43 2557 )
8bd0068d 2558 ),
2559 "/^style/i" =>
2560 Array(
2561 Array(
5db90261 2562 "/\/\*.*\*\//",
8bd0068d 2563 "/expression/i",
2564 "/binding/i",
2565 "/behaviou*r/i",
2566 "/include-source/i",
39352565 2567
2568 // position:relative can also be exploited
2569 // to put content outside of email body area
2570 // and position:fixed is similarly exploitable
2571 // as position:absolute, so we'll remove it
2572 // altogether....
2573 //
2574 // Does this screw up legitimate HTML messages?
2575 // If so, the only fix I see is to allow position
2576 // attributes (any values? I think we still have
2577 // to block static and fixed) only if $use_iframe
2578 // is enabled (1.5.0+)
2579 //
2580 // was: "/position\s*:\s*absolute/i",
2581 //
2582 "/position\s*:/i",
2583
1d935bc2 2584 "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
8bd0068d 2585 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
2586 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
2587 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
39352565 2588 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
8bd0068d 2589 ),
2590 Array(
5db90261 2591 "",
8bd0068d 2592 "idiocy",
2593 "idiocy",
2594 "idiocy",
2595 "idiocy",
567dc524 2596 "idiocy",
5b4884be 2597 "url",
8bd0068d 2598 "url(\\1#\\1)",
2599 "url(\\1#\\1)",
2600 "url(\\1#\\1)",
8bd0068d 2601 "\\1:url(\\2#\\3)"
2602 )
691a2d25 2603 )
8bd0068d 2604 )
691a2d25 2605 );
9ebace19 2606
d31f73f1 2607 // If there's no "view_unsafe_images" variable in the URL, turn unsafe
2608 // images off by default.
afbf184c 2609 sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
9ebace19 2610
691a2d25 2611 if (!$view_unsafe_images){
2612 /**
8bd0068d 2613 * Remove any references to http/https if view_unsafe_images set
2614 * to false.
2615 */
02474e43 2616 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
8bd0068d 2617 '/^([\'\"])\s*https*:.*([\'\"])/si');
02474e43 2618 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
8bd0068d 2619 "\\1$secremoveimg\\1");
02474e43 2620 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
7ef0b415 2621 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
02474e43 2622 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
8bd0068d 2623 "url(\\1$secremoveimg\\1)");
691a2d25 2624 }
451f74a2 2625
691a2d25 2626 $add_attr_to_tag = Array(
8bd0068d 2627 "/^a$/i" =>
c25f2fbb 2628 Array('target'=>'"_blank"',
02474e43 2629 'title'=>'"'._("This external link will open in a new window").'"'
8bd0068d 2630 )
2631 );
da2415c1 2632 $trusted = sq_sanitize($body,
8bd0068d 2633 $tag_list,
2634 $rm_tags_with_content,
2635 $self_closing_tags,
2636 $force_tag_closing,
2637 $rm_attnames,
2638 $bad_attvals,
2639 $add_attr_to_tag,
2640 $message,
2641 $id,
2642 $mailbox
2643 );
567dc524 2644 if (strpos($trusted,$secremoveimg)){
691a2d25 2645 $has_unsafe_images = true;
da2415c1 2646 }
c189a963 2647
2648 // we want to parse mailto's in HTML output, change to SM compose links
2649 // this is a modified version of code from url_parser.php... but Marc is
2650 // right: we need a better filtering implementation; adding this randomly
2651 // here is not a great solution
2652 //
2653 if ($take_mailto_links) {
2654 // parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
2655 global $MailTo_PReg_Match;
202bcbcc 2656 $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
c189a963 2657 if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
2658 foreach ($regs[0] as $i => $mailto_before) {
2659 $mailto_params = $regs[10][$i];
2660 // get rid of any tailing quote since we have to add send_to to the end
2661 //
2662 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
2663 $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
2664 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
2665 $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
2666
2667 if ($regs[1][$i]) { //if there is an email addr before '?', we need to merge it with the params
2668 $to = 'to=' . $regs[1][$i];
2669 if (strpos($mailto_params, 'to=') > -1) //already a 'to='
2670 $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
2671 else {
2672 if ($mailto_params) //already some params, append to them
2673 $mailto_params .= '&amp;' . $to;
2674 else
2675 $mailto_params .= '?' . $to;
2676 }
2677 }
2678
2679 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
2680
2681 // we'll already have target=_blank, no need to allow comp_in_new
2682 // here (which would be a lot more work anyway)
2683 //
2684 global $compose_new_win;
2685 $temp_comp_in_new = $compose_new_win;
2686 $compose_new_win = 0;
2687 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
2688 $compose_new_win = $temp_comp_in_new;
2689
2690 // remove <a href=" and anything after the next quote (we only
2691 // need the uri, not the link HTML) in compose uri
2692 //
2693 $comp_uri = substr($comp_uri, 9);
2694 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
2695 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
2696 }
2697 }
2698 }
2699
691a2d25 2700 return $trusted;
451f74a2 2701}
a4a70693 2702
da2415c1 2703/**
8bd0068d 2704 * function SendDownloadHeaders - send file to the browser
2705 *
2706 * Original Source: SM core src/download.php
2707 * moved here to make it available to other code, and separate
2708 * front end from back end functionality.
2709 *
2710 * @param string $type0 first half of mime type
2711 * @param string $type1 second half of mime type
2712 * @param string $filename filename to tell the browser for downloaded file
2713 * @param boolean $force whether to force the download dialog to pop
2714 * @param optional integer $filesize send the Content-Header and length to the browser
2715 * @return void
2716 */
02474e43 2717function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
2718 global $languages, $squirrelmail_language;
cfffd60b 2719 $isIE = $isIE6plus = false;
02474e43 2720
2721 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
2722
2723 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
8bd0068d 2724 strstr($HTTP_USER_AGENT, 'Opera') === false) {
cfffd60b 2725 $isIE = true;
02474e43 2726 }
2727
cfffd60b 2728 if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
2729 ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
2730 $isIE6plus = true;
02474e43 2731 }
2732
2733 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
8bd0068d 2734 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
02474e43 2735 $filename =
8bd0068d 2736 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
02474e43 2737 } else {
1a4bc4a6 2738 $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&nbsp;', ' ', $filename));
02474e43 2739 }
2740
2741 // A Pox on Microsoft and it's Internet Explorer!
2742 //
2743 // IE has lots of bugs with file downloads.
2744 // It also has problems with SSL. Both of these cause problems
2745 // for us in this function.
2746 //
2747 // See this article on Cache Control headers and SSL
2748 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
2749 //
2750 // The best thing you can do for IE is to upgrade to the latest
2751 // version
2752 //set all the Cache Control Headers for IE
2753 if ($isIE) {
2754 $filename=rawurlencode($filename);
2755 header ("Pragma: public");
8bd0068d 2756 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
02474e43 2757 header ("Cache-Control: post-check=0, pre-check=0", false);
8bd0068d 2758 header ("Cache-Control: private");
02474e43 2759
2760 //set the inline header for IE, we'll add the attachment header later if we need it
2761 header ("Content-Disposition: inline; filename=$filename");
2762 }
2763
2764 if (!$force) {
2765 // Try to show in browser window
2766 header ("Content-Disposition: inline; filename=\"$filename\"");
2767 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2768 } else {
2769 // Try to pop up the "save as" box
2770
2771 // IE makes this hard. It pops up 2 save boxes, or none.
2772 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2773 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2774 // But, according to Microsoft, it is "RFC compliant but doesn't
2775 // take into account some deviations that allowed within the
2776 // specification." Doesn't that mean RFC non-compliant?
2777 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2778
2779 // all browsers need the application/octet-stream header for this
2780 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2781
2782 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2783 // Do not have quotes around filename, but that applied to
2784 // "attachment"... does it apply to inline too?
2785 header ("Content-Disposition: attachment; filename=\"$filename\"");
2786
cfffd60b 2787 if ($isIE && !$isIE6plus) {
02474e43 2788 // This combination seems to work mostly. IE 5.5 SP 1 has
2789 // known issues (see the Microsoft Knowledge Base)
2790
2791 // This works for most types, but doesn't work with Word files
2792 header ("Content-Type: application/download; name=\"$filename\"");
7e2ff844 2793 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2794 // These are spares, just in case. :-)
2795 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2796 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2797 //header("Content-Type: application/octet-stream; name=\"$filename\"");
7e2ff844 2798 } else if ($isIE) {
2799 // This is to prevent IE for MIME sniffing and auto open a file in IE
2800 header ("Content-Type: application/force-download; name=\"$filename\"");
02474e43 2801 } else {
2802 // another application/octet-stream forces download for Netscape
2803 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2804 }
2805 }
2806
2807 //send the content-length header if the calling function provides it
2808 if ($filesize > 0) {
2809 header("Content-Length: $filesize");
2810 }
07c49f57 2811
8d863f64 2812} // end fn SendDownloadHeaders
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