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/tags/webmail-release-1_4_22/functions/mime.php

#
PHP | 2632 lines | 1658 code | 178 blank | 796 comment | 405 complexity | a9c9565d841d40fde67fa02cb56e7670 MD5 | raw file
Possible License(s): AGPL-1.0, GPL-2.0 
    

  1. <?php
    2. 

  2. 

  3. /**
    4. 

  4.  * mime.php
    5. 

  5.  *
    6. 

  6.  * This contains the functions necessary to detect and decode MIME
    7. 

  7.  * messages.
    8. 

  8.  *
    9. 

  9.  * @copyright 1999-2011 The SquirrelMail Project Team
    10. 

  10.  * @license http://opensource.org/licenses/gpl-license.php GNU Public License
    11. 

  11.  * @version $Id: mime.php 14121 2011-07-12 04:53:35Z pdontthink $
    12. 

  12.  * @package squirrelmail
    13. 

  13.  */
    14. 

  14. 

  15. /** The typical includes... */
    16. 

  16. require_once(SM_PATH . 'functions/imap.php');
    17. 

  17. require_once(SM_PATH . 'functions/attachment_common.php');
    18. 

  18. 

  19. /* -------------------------------------------------------------------------- */
    20. 

  20. /* MIME DECODING                                                              */
    21. 

  21. /* -------------------------------------------------------------------------- */
    22. 

  22. 

  23. /**
    24. 

  24.  * Get the MIME structure
    25. 

  25.  *
    26. 

  26.  * This function gets the structure of a message and stores it in the "message" class.
    27. 

  27.  * It will return this object for use with all relevant header information and
    28. 

  28.  * fully parsed into the standard "message" object format.
    29. 

  29.  */
    30. 

  30. function mime_structure ($bodystructure, $flags=array()) {
    31. 

  31. 

  32.     /* Isolate the body structure and remove beginning and end parenthesis. */
    33. 

  33.     $read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') + 13));
    34. 

  34.     $read = trim(substr ($read, 0, -1));
    35. 

  35.     $i = 0;
    36. 

  36.     $msg = Message::parseStructure($read,$i);
    37. 

  37.     if (!is_object($msg)) {
    38. 

  38.         include_once(SM_PATH . 'functions/display_messages.php');
    39. 

  39.         global $color, $mailbox;
    40. 

  40.         /* removed urldecode because $_GET is auto urldecoded ??? */
    41. 

  41.         displayPageHeader( $color, $mailbox );
    42. 

  42.         echo "<body text=\"$color[8]\" bgcolor=\"$color[4]\" link=\"$color[7]\" vlink=\"$color[7]\" alink=\"$color[7]\">\n\n" .
    43. 

  43.          '<center>';
    44. 

  44.         $errormessage  = _("SquirrelMail could not decode the bodystructure of the message");
    45. 

  45.         $errormessage .= '<br />'._("The bodystructure provided by your IMAP server:").'<br /><br />';
    46. 

  46.         $errormessage .= '<table><tr><td>' . htmlspecialchars($read) . '</td></tr></table>';
    47. 

  47.         plain_error_message( $errormessage, $color );
    48. 

  48.         echo '</body></html>';
    49. 

  49.         exit;
    50. 

  50.     }
    51. 

  51.     if (count($flags)) {
    52. 

  52.         foreach ($flags as $flag) {
    53. 

  53.             $char = strtoupper($flag{1});
    54. 

  54.             switch ($char) {
    55. 

  55.                 case 'S':
    56. 

  56.                     if (strtolower($flag) == '\\seen') {
    57. 

  57.                         $msg->is_seen = true;
    58. 

  58.                     }
    59. 

  59.                     break;
    60. 

  60.                 case 'A':
    61. 

  61.                     if (strtolower($flag) == '\\answered') {
    62. 

  62.                         $msg->is_answered = true;
    63. 

  63.                     }
    64. 

  64.                     break;
    65. 

  65.                 case 'D':
    66. 

  66.                     if (strtolower($flag) == '\\deleted') {
    67. 

  67.                         $msg->is_deleted = true;
    68. 

  68.                     }
    69. 

  69.                     break;
    70. 

  70.                 case 'F':
    71. 

  71.                     if (strtolower($flag) == '\\flagged') {
    72. 

  72.                         $msg->is_flagged = true;
    73. 

  73.                     }
    74. 

  74.                     break;
    75. 

  75.                 case 'M':
    76. 

  76.                     if (strtolower($flag) == '$mdnsent') {
    77. 

  77.                         $msg->is_mdnsent = true;
    78. 

  78.                     }
    79. 

  79.                     break;
    80. 

  80.                 default:
    81. 

  81.                     break;
    82. 

  82.             }
    83. 

  83.         }
    84. 

  84.     }
    85. 

  85.     //    listEntities($msg);
    86. 

  86.     return $msg;
    87. 

  87. }
    88. 

  88. 

  89. 

  90. 

  91. /* This starts the parsing of a particular structure.  It is called recursively,
    92. 

  92.  * so it can be passed different structures.  It returns an object of type
    93. 

  93.  * $message.
    94. 

  94.  * First, it checks to see if it is a multipart message.  If it is, then it
    95. 

  95.  * handles that as it sees is necessary.  If it is just a regular entity,
    96. 

  96.  * then it parses it and adds the necessary header information (by calling out
    97. 

  97.  * to mime_get_elements()
    98. 

  98.  */
    99. 

  99. 

  100. function mime_fetch_body($imap_stream, $id, $ent_id=1, $fetch_size=0) {
    101. 

  101.     global $uid_support;
    102. 

  102.     /* Do a bit of error correction.  If we couldn't find the entity id, just guess
    103. 

  103.      * that it is the first one.  That is usually the case anyway.
    104. 

  104.      */
    105. 

  105. 

  106.     if (!$ent_id) {
    107. 

  107.         $cmd = "FETCH $id BODY[]";
    108. 

  108.     } else {
    109. 

  109.         $cmd = "FETCH $id BODY[$ent_id]";
    110. 

  110.     }
    111. 

  111. 

  112.     if ($fetch_size!=0) $cmd .= "<0.$fetch_size>";
    113. 

  113. 

  114.     $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, $uid_support);
    115. 

  115.     do {
    116. 

  116.         $topline = trim(array_shift($data));
    117. 

  117.     } while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH.*/i', $topline)) ;
    118. 

  118. 

  119.     $wholemessage = implode('', $data);
    120. 

  120.     if (preg_match('/\{([^\}]*)\}/', $topline, $regs)) {
    121. 

  121.         $ret = substr($wholemessage, 0, $regs[1]);
    122. 

  122.         /* There is some information in the content info header that could be important
    123. 

  123.          * in order to parse html messages. Let's get them here.
    124. 

  124.          */
    125. 

  125. //        if ($ret{0} == '<') {
    126. 

  126. //            $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, $uid_support);
    127. 

  127. //        }
    128. 

  128.     } else if (preg_match('/"([^"]*)"/', $topline, $regs)) {
    129. 

  129.         $ret = $regs[1];
    130. 

  130.     } else if ((stristr($topline, 'nil') !== false) && (empty($wholemessage))) {
    131. 

  131.         $ret = $wholemessage;
    132. 

  132.     } else {
    133. 

  133.         global $where, $what, $mailbox, $passed_id, $startMessage;
    134. 

  134.         $par = 'mailbox=' . urlencode($mailbox) . '&amp;passed_id=' . $passed_id;
    135. 

  135.         if (isset($where) && isset($what)) {
    136. 

  136.             $par .= '&amp;where=' . urlencode($where) . '&amp;what=' . urlencode($what);
    137. 

  137.         } else {
    138. 

  138.             $par .= '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
    139. 

  139.         }
    140. 

  140.         $par .= '&amp;response=' . urlencode($response) .
    141. 

  141.             '&amp;message='  . urlencode($message)  .
    142. 

  142.             '&amp;topline='  . urlencode($topline);
    143. 

  143. 

  144.         echo '<tt><br />' .
    145. 

  145.             '<table width="80%"><tr>' .
    146. 

  146.             '<tr><td colspan="2">' .
    147. 

  147.             _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
    148. 

  148.             '</td></tr>' .
    149. 

  149.             '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
    150. 

  150.             '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
    151. 

  151.             '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
    152. 

  152.             '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
    153. 

  153.             "</table><br /></tt></font><hr />";
    154. 

  154. 

  155.         $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, $uid_support);
    156. 

  156.         array_shift($data);
    157. 

  157.         $wholemessage = implode('', $data);
    158. 

  158. 

  159.         $ret = $wholemessage;
    160. 

  160.     }
    161. 

  161.     return $ret;
    162. 

  162. }
    163. 

  163. 

  164. function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding, $rStream='php://stdout') {
    165. 

  165.     global $uid_support;
    166. 

  166. 

  167.     /* Don't kill the connection if the browser is over a dialup
    168. 

  168.      * and it would take over 30 seconds to download it.
    169. 

  169.      * Don't call set_time_limit in safe mode.
    170. 

  170.      */
    171. 

  171. 

  172.     if (!ini_get('safe_mode')) {
    173. 

  173.         set_time_limit(0);
    174. 

  174.     }
    175. 

  175.     /* in case of base64 encoded attachments, do not buffer them.
    176. 

  176.        Instead, echo the decoded attachment directly to screen */
    177. 

  177.     if (strtolower($encoding) == 'base64') {
    178. 

  178.         if (!$ent_id) {
    179. 

  179.             $query = "FETCH $id BODY[]";
    180. 

  180.         } else {
    181. 

  181.             $query = "FETCH $id BODY[$ent_id]";
    182. 

  182.         }
    183. 

  183.         sqimap_run_command($imap_stream,$query,true,$response,$message,$uid_support,'sqimap_base64_decode',$rStream,true);
    184. 

  184.    } else {
    185. 

  185.         $body = mime_fetch_body ($imap_stream, $id, $ent_id);
    186. 

  186.         if ($rStream !== 'php://stdout') {
    187. 

  187.             fwrite($rStream, decodeBody($body, $encoding));
    188. 

  188.         } else {
    189. 

  189.             echo decodeBody($body, $encoding);
    190. 

  190.         }
    191. 

  191.     }
    192. 

  192.     return;
    193. 

  193. }
    194. 

  194. 

  195. /* -[ END MIME DECODING ]----------------------------------------------------------- */
    196. 

  196. 

  197. /* This is here for debugging purposes.  It will print out a list
    198. 

  198.  * of all the entity IDs that are in the $message object.
    199. 

  199.  */
    200. 

  200. function listEntities ($message) {
    201. 

  201.     if ($message) {
    202. 

  202.         echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br />';
    203. 

  203.         for ($i = 0; isset($message->entities[$i]); $i++) {
    204. 

  204.             echo "$i : ";
    205. 

  205.             $msg = listEntities($message->entities[$i]);
    206. 

  206. 

  207.             if ($msg) {
    208. 

  208.                 echo "return: ";
    209. 

  209.                 return $msg;
    210. 

  210.             }
    211. 

  211.         }
    212. 

  212.     }
    213. 

  213. }
    214. 

  214. 

  215. function getPriorityStr($priority) {
    216. 

  216.     $priority_level = substr($priority,0,1);
    217. 

  217. 

  218.     switch($priority_level) {
    219. 

  219.         /* Check for a higher then normal priority. */
    220. 

  220.         case '1':
    221. 

  221.         case '2':
    222. 

  222.             $priority_string = _("High");
    223. 

  223.             break;
    224. 

  224. 

  225.         /* Check for a lower then normal priority. */
    226. 

  226.         case '4':
    227. 

  227.         case '5':
    228. 

  228.             $priority_string = _("Low");
    229. 

  229.             break;
    230. 

  230. 

  231.         /* Check for a normal priority. */
    232. 

  232.         case '3':
    233. 

  233.         default:
    234. 

  234.             $priority_level = '3';
    235. 

  235.             $priority_string = _("Normal");
    236. 

  236.             break;
    237. 

  237. 

  238.     }
    239. 

  239.     return $priority_string;
    240. 

  240. }
    241. 

  241. 

  242. /* returns a $message object for a particular entity id */
    243. 

  243. function getEntity ($message, $ent_id) {
    244. 

  244.     return $message->getEntity($ent_id);
    245. 

  245. }
    246. 

  246. 

  247. /* translateText
    248. 

  248.  * Extracted from strings.php 23/03/2002
    249. 

  249.  */
    250. 

  250. 

  251. function translateText(&$body, $wrap_at, $charset) {
    252. 

  252.     global $where, $what;   /* from searching */
    253. 

  253.     global $color;          /* color theme */
    254. 

  254. 

  255.     require_once(SM_PATH . 'functions/url_parser.php');
    256. 

  256. 

  257.     $body_ary = explode("\n", $body);
    258. 

  258.     for ($i=0; $i < count($body_ary); $i++) {
    259. 

  259.         $line = $body_ary[$i];
    260. 

  260.         if (strlen($line) - 2 >= $wrap_at) {
    261. 

  261.             sqWordWrap($line, $wrap_at, $charset);
    262. 

  262.         }
    263. 

  263.         $line = charset_decode($charset, $line);
    264. 

  264.         $line = str_replace("\t", '        ', $line);
    265. 

  265. 

  266.         parseUrl ($line);
    267. 

  267. 

  268.         $quotes = 0;
    269. 

  269.         $pos = 0;
    270. 

  270.         $j = strlen($line);
    271. 

  271. 

  272.         while ($pos < $j) {
    273. 

  273.             if ($line[$pos] == ' ') {
    274. 

  274.                 $pos++;
    275. 

  275.             } else if (strpos($line, '&gt;', $pos) === $pos) {
    276. 

  276.                 $pos += 4;
    277. 

  277.                 $quotes++;
    278. 

  278.             } else {
    279. 

  279.                 break;
    280. 

  280.             }
    281. 

  281.         }
    282. 

  282. 

  283.         if ($quotes % 2) {
    284. 

  284.             if (!isset($color[13])) {
    285. 

  285.                 $color[13] = '#800000';
    286. 

  286.             }
    287. 

  287.             $line = '<font color="' . $color[13] . '">' . $line . '</font>';
    288. 

  288.         } elseif ($quotes) {
    289. 

  289.             if (!isset($color[14])) {
    290. 

  290.                 $color[14] = '#FF0000';
    291. 

  291.             }
    292. 

  292.             $line = '<font color="' . $color[14] . '">' . $line . '</font>';
    293. 

  293.         }
    294. 

  294. 

  295.         $body_ary[$i] = $line;
    296. 

  296.     }
    297. 

  297.     $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
    298. 

  298. }
    299. 

  299. 

  300. /**
    301. 

  301.  * This returns a parsed string called $body. That string can then
    302. 

  302.  * be displayed as the actual message in the HTML. It contains
    303. 

  303.  * everything needed, including HTML Tags, Attachments at the
    304. 

  304.  * bottom, etc.
    305. 

  305.  */
    306. 

  306. function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX',$clean=false) {
    307. 

  307.     /* This if statement checks for the entity to show as the
    308. 

  308.      * primary message. To add more of them, just put them in the
    309. 

  309.      * order that is their priority.
    310. 

  310.      */
    311. 

  311.     global $startMessage, $languages, $squirrelmail_language,
    312. 

  312.            $show_html_default, $sort, $has_unsafe_images, $passed_ent_id,
    313. 

  313.            $username, $key, $imapServerAddress, $imapPort,
    314. 

  314.            $download_and_unsafe_link;
    315. 

  315. 

  316.     // If there's no "view_unsafe_images" variable in the URL, turn unsafe
    317. 

  317.     // images off by default.
    318. 

  318.     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
    319. 

  319.         $view_unsafe_images = false;
    320. 

  320.     }
    321. 

  321. 

  322.     $body = '';
    323. 

  323.     $urlmailbox = urlencode($mailbox);
    324. 

  324.     $body_message = getEntity($message, $ent_num);
    325. 

  325.     if (($body_message->header->type0 == 'text') ||
    326. 

  326.             ($body_message->header->type0 == 'rfc822')) {
    327. 

  327.         $body = mime_fetch_body ($imap_stream, $id, $ent_num);
    328. 

  328.         $body = decodeBody($body, $body_message->header->encoding);
    329. 

  329. 

  330.         if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    331. 

  331.                 function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    332. 

  332.             if (mb_detect_encoding($body) != 'ASCII') {
    333. 

  333.                 $body = $languages[$squirrelmail_language]['XTRA_CODE']('decode', $body);
    334. 

  334.             }
    335. 

  335.         }
    336. 

  336.         $hookResults = do_hook("message_body", $body);
    337. 

  337.         $body = $hookResults[1];
    338. 

  338. 

  339.         /* If there are other types that shouldn't be formatted, add
    340. 

  340.          * them here.
    341. 

  341.          */
    342. 

  342. 

  343.         if ($body_message->header->type1 == 'html') {
    344. 

  344.             if ($show_html_default <> 1) {
    345. 

  345.                 $entity_conv = array('&nbsp;' => ' ',
    346. 

  346.                                      '<p>'    => "\n",
    347. 

  347.                                      '<P>'    => "\n",
    348. 

  348.                                      '<br>'   => "\n",
    349. 

  349.                                      '<BR>'   => "\n",
    350. 

  350.                                      '<br />' => "\n",
    351. 

  351.                                      '<BR />' => "\n",
    352. 

  352.                                      '&gt;'   => '>',
    353. 

  353.                                      '&lt;'   => '<');
    354. 

  354.                 $body = strtr($body, $entity_conv);
    355. 

  355.                 $body = strip_tags($body);
    356. 

  356.                 $body = trim($body);
    357. 

  357.                 translateText($body, $wrap_at,
    358. 

  358.                         $body_message->header->getParameter('charset'));
    359. 

  359.             } else {
    360. 

  360.                 $charset = $body_message->header->getParameter('charset');
    361. 

  361.                 if (!empty($charset))
    362. 

  362.                     $body = charset_decode($charset,$body,false,true);
    363. 

  363.                 $body = magicHTML($body, $id, $message, $mailbox);
    364. 

  364.             }
    365. 

  365.         } else {
    366. 

  366.             translateText($body, $wrap_at,
    367. 

  367.                     $body_message->header->getParameter('charset'));
    368. 

  368.         }
    369. 

  369. 

  370.         // if this is the clean display (i.e. printer friendly), stop here.
    371. 

  371.         if ( $clean ) {
    372. 

  372.             return $body;
    373. 

  373.         }
    374. 

  374. 

  375.         /*
    376. 

  376.          * Previously the links for downloading and unsafe images were printed
    377. 

  377.          * under the mail. By putting the links in a global variable we can
    378. 

  378.          * print it in the toolbar where it belongs. Since the original code was
    379. 

  379.          * in this place it's left here. It might be possible to move it to some
    380. 

  380.          * other place if that makes sense. The possibility to do so has not
    381. 

  381.          * been evaluated yet.
    382. 

  382.          */
    383. 

  383. 

  384.         // Initialize the global variable to an empty string.
    385. 

  385.         $download_and_unsafe_link = '';
    386. 

  386. 

  387.         // Prepare and build a link for downloading the mail.
    388. 

  388.         $link = 'passed_id=' . $id . '&amp;ent_id='.$ent_num.
    389. 

  389.             '&amp;mailbox=' . $urlmailbox .'&amp;sort=' . $sort .
    390. 

  390.             '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
    391. 

  391.         if (isset($passed_ent_id)) {
    392. 

  392.             $link .= '&amp;passed_ent_id='.$passed_ent_id;
    393. 

  393.         }
    394. 

  394. 

  395.         // Always add the link for downloading the mail as a file to the global
    396. 

  396.         // variable.
    397. 

  397.         $download_and_unsafe_link .= '&nbsp;|&nbsp;<a href="download.php?absolute_dl=true&amp;' .
    398. 

  398.             $link . '">' . _("Download this as a file") .  '</a>';
    399. 

  399. 

  400.         // Find out the right text to use in the link depending on the
    401. 

  401.         // circumstances. If the unsafe images are displayed the link should
    402. 

  402.         // hide them, if they aren't displayed the link should only appear if
    403. 

  403.         // the mail really contains unsafe images.
    404. 

  404.         if ($view_unsafe_images) {
    405. 

  405.             $text = _("Hide Unsafe Images");
    406. 

  406.         } else {
    407. 

  407.             if (isset($has_unsafe_images) && $has_unsafe_images) {
    408. 

  408.                 $link .= '&amp;view_unsafe_images=1';
    409. 

  409.                 $text = _("View Unsafe Images");
    410. 

  410.             } else {
    411. 

  411.                 $text = '';
    412. 

  412.             }
    413. 

  413.         }
    414. 

  414. 

  415.         // Only create a link for unsafe images if there's need for one. If so:
    416. 

  416.         // add it to the global variable.
    417. 

  417.         if($text != '') {
    418. 

  418.             $download_and_unsafe_link .= '&nbsp;|&nbsp;<a href="read_body.php?' . $link . '">' . $text . '</a>';
    419. 

  419.         }
    420. 

  420.     }
    421. 

  421.     return $body;
    422. 

  422. }
    423. 

  423. 

  424. 

  425. function formatAttachments($message, $exclude_id, $mailbox, $id) {
    426. 

  426.     global $where, $what, $startMessage, $color, $passed_ent_id;
    427. 

  427.     static $ShownHTML = 0;
    428. 

  428. 

  429.     $att_ar = $message->getAttachments($exclude_id);
    430. 

  430. 

  431.     if (!count($att_ar)) return '';
    432. 

  432. 

  433.     $attachments = '';
    434. 

  434. 

  435.     $urlMailbox = urlencode($mailbox);
    436. 

  436. 

  437.     foreach ($att_ar as $att) {
    438. 

  438.         $ent = $att->entity_id;
    439. 

  439.         $header = $att->header;
    440. 

  440.         $type0 = strtolower($header->type0);
    441. 

  441.         $type1 = strtolower($header->type1);
    442. 

  442.         $name = '';
    443. 

  443.         $links['download link']['text'] = _("Download");
    444. 

  444.         $links['download link']['href'] = SM_PATH .
    445. 

  445.             "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
    446. 

  446.         $ImageURL = '';
    447. 

  447.         if ($type0 =='message' && $type1 == 'rfc822') {
    448. 

  448.             $default_page = SM_PATH . 'src/read_body.php';
    449. 

  449.             $rfc822_header = $att->rfc822_header;
    450. 

  450.             $filename = $rfc822_header->subject;
    451. 

  451.             if (trim( $filename ) == '') {
    452. 

  452.                 $filename = 'untitled-[' . $ent . ']' ;
    453. 

  453.             }
    454. 

  454.             $from_o = $rfc822_header->from;
    455. 

  455.             if (is_object($from_o)) {
    456. 

  456.                 $from_name = $from_o->getAddress(false);
    457. 

  457.             } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
    458. 

  458.                 // when a digest message is opened and you return to the digest
    459. 

  459.                 // now the from object is part of an array. This is a workaround.
    460. 

  460.                 $from_name = $from_o[0]->getAddress(false);
    461. 

  461.             } else {
    462. 

  462.                 $from_name = _("Unknown sender");
    463. 

  463.             }
    464. 

  464.             $from_name = decodeHeader(($from_name));
    465. 

  465.             $description = $from_name;
    466. 

  466.         } else {
    467. 

  467.             $default_page = SM_PATH . 'src/download.php';
    468. 

  468.             if (is_object($header->disposition)) {
    469. 

  469.                 $filename = $header->disposition->getProperty('filename');
    470. 

  470.                 if (trim($filename) == '') {
    471. 

  471.                     $name = decodeHeader($header->disposition->getProperty('name'));
    472. 

  472.                     if (trim($name) == '') {
    473. 

  473.                         $name = $header->getParameter('name');
    474. 

  474.                         if(trim($name) == '') {
    475. 

  475.                             if (trim( $header->id ) == '') {
    476. 

  476.                                 $filename = 'untitled-[' . $ent . ']' . '.' . strtolower($header->type1);
    477. 

  477.                             } else {
    478. 

  478.                                 $filename = 'cid: ' . $header->id . '.' . strtolower($header->type1);
    479. 

  479.                             }
    480. 

  480.                         } else {
    481. 

  481.                             $filename = $name;
    482. 

  482.                         }
    483. 

  483.                     } else {
    484. 

  484.                         $filename = $name;
    485. 

  485.                     }
    486. 

  486.                 }
    487. 

  487.             } else {
    488. 

  488.                 $filename = $header->getParameter('name');
    489. 

  489.                 if (!trim($filename)) {
    490. 

  490.                     if (trim( $header->id ) == '') {
    491. 

  491.                         $filename = 'untitled-[' . $ent . ']' . '.' . strtolower($header->type1) ;
    492. 

  492.                     } else {
    493. 

  493.                         $filename = 'cid: ' . $header->id . '.' . strtolower($header->type1);
    494. 

  494.                     }
    495. 

  495.                 }
    496. 

  496.             }
    497. 

  497.             if ($header->description) {
    498. 

  498.                 $description = decodeHeader($header->description);
    499. 

  499.             } else {
    500. 

  500.                 $description = '';
    501. 

  501.             }
    502. 

  502.         }
    503. 

  503. 

  504.         $display_filename = $filename;
    505. 

  505.         if (isset($passed_ent_id)) {
    506. 

  506.             $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
    507. 

  507.         } else {
    508. 

  508.             $passed_ent_id_link = '';
    509. 

  509.         }
    510. 

  510.         $defaultlink = $default_page . "?startMessage=$startMessage"
    511. 

  511.             . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
    512. 

  512.             . '&amp;ent_id='.$ent.$passed_ent_id_link;
    513. 

  513.         if ($where && $what) {
    514. 

  514.            $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
    515. 

  515.         }
    516. 

  516.         // IE does make use of mime content sniffing. Forcing a download
    517. 

  517.         // prohibit execution of XSS inside an application/octet-stream attachment
    518. 

  518.         if ($type0 == 'application' && $type1 == 'octet-stream') {
    519. 

  519.             $defaultlink .= '&amp;absolute_dl=true';
    520. 

  520.         }
    521. 

  521.         /* This executes the attachment hook with a specific MIME-type.
    522. 

  522.          * If that doesn't have results, it tries if there's a rule
    523. 

  523.          * for a more generic type. Finally, a hook for ALL attachment
    524. 

  524.          * types is run as well.
    525. 

  525.          */
    526. 

  526.         $hookresults = do_hook("attachment $type0/$type1", $links,
    527. 

  527.                 $startMessage, $id, $urlMailbox, $ent, $defaultlink,
    528. 

  528.                 $display_filename, $where, $what);
    529. 

  529.         $hookresults = do_hook("attachment $type0/*", $hookresults[1],
    530. 

  530.                 $startMessage, $id, $urlMailbox, $ent, $hookresults[6],
    531. 

  531.                 $display_filename, $where, $what);
    532. 

  532.         $hookresults = do_hook("attachment */*", $hookresults[1],
    533. 

  533.                 $startMessage, $id, $urlMailbox, $ent, $hookresults[6],
    534. 

  534.                 $display_filename, $where, $what);
    535. 

  535. 

  536.         $links = $hookresults[1];
    537. 

  537.         $defaultlink = $hookresults[6];
    538. 

  538. 

  539.         $attachments .= '<tr><td>' .
    540. 

  540.             '<a href="'.$defaultlink.'">'.decodeHeader($display_filename).'</a>&nbsp;</td>' .
    541. 

  541.             '<td><small><b>' . show_readable_size($header->size) .
    542. 

  542.             '</b>&nbsp;&nbsp;</small></td>' .
    543. 

  543.             '<td><small>[ '.htmlspecialchars($type0).'/'.htmlspecialchars($type1).' ]&nbsp;</small></td>' .
    544. 

  544.             '<td><small>';
    545. 

  545.         $attachments .= '<b>' . $description . '</b>';
    546. 

  546.         $attachments .= '</small></td><td><small>&nbsp;';
    547. 

  547. 

  548.         $skipspaces = 1;
    549. 

  549.         foreach ($links as $val) {
    550. 

  550.             if ($skipspaces) {
    551. 

  551.                 $skipspaces = 0;
    552. 

  552.             } else {
    553. 

  553.                 $attachments .= '&nbsp;&nbsp;|&nbsp;&nbsp;';
    554. 

  554.             }
    555. 

  555.             $attachments .= '<a href="' . $val['href'] . '">' .  $val['text'] . '</a>';
    556. 

  556.         }
    557. 

  557.         unset($links);
    558. 

  558.         $attachments .= "</td></tr>\n";
    559. 

  559.     }
    560. 

  560.     return $attachments;
    561. 

  561. }
    562. 

  562. 

  563. function sqimap_base64_decode(&$string) {
    564. 

  564. 

  565.     // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
    566. 

  566.     // fly decoding (to reduce memory usage) you have to check if the
    567. 

  567.     // data has incomplete pairs
    568. 

  568. 

  569.     // Remove the noise in order to check if the 4 bytes pairs are complete
    570. 

  570.     $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
    571. 

  571. 

  572.     $sStringRem = '';
    573. 

  573.     $iMod = strlen($string) % 4;
    574. 

  574.     if ($iMod) {
    575. 

  575.         $sStringRem = substr($string,-$iMod);
    576. 

  576.         // Check if $sStringRem contains padding characters
    577. 

  577.         if (substr($sStringRem,-1) != '=') {
    578. 

  578.             $string = substr($string,0,-$iMod);
    579. 

  579.         } else {
    580. 

  580.             $sStringRem = '';
    581. 

  581.         }
    582. 

  582.     }
    583. 

  583.     $string = base64_decode($string);
    584. 

  584.     return $sStringRem;
    585. 

  585. }
    586. 

  586. 

  587. /**
    588. 

  588.  * Decodes encoded message body
    589. 

  589.  *
    590. 

  590.  * This function decodes the body depending on the encoding type.
    591. 

  591.  * Currently quoted-printable and base64 encodings are supported.
    592. 

  592.  * decode_body hook was added to this function in 1.4.2/1.5.0
    593. 

  593.  * @param string $body encoded message body
    594. 

  594.  * @param string $encoding used encoding
    595. 

  595.  * @return string decoded string
    596. 

  596.  * @since 1.0
    597. 

  597.  */
    598. 

  598. function decodeBody($body, $encoding) {
    599. 

  599. 

  600.     $body = str_replace("\r\n", "\n", $body);
    601. 

  601.     $encoding = strtolower($encoding);
    602. 

  602. 

  603.     $encoding_handler = do_hook_function('decode_body', $encoding);
    604. 

  604. 

  605.     // plugins get first shot at decoding the body
    606. 

  606.     if (!empty($encoding_handler) && function_exists($encoding_handler)) {
    607. 

  607.         $body = $encoding_handler('decode', $body);
    608. 

  608. 

  609.     } elseif ($encoding == 'quoted-printable' ||
    610. 

  610.             $encoding == 'quoted_printable') {
    611. 

  611.         /**
    612. 

  612.          * quoted_printable_decode() function is broken in older
    613. 

  613.          * php versions. Text with \r\n decoding was fixed only
    614. 

  614.          * in php 4.3.0. Minimal code requirement 4.0.4 +
    615. 

  615.          * str_replace("\r\n", "\n", $body); call.
    616. 

  616.          */
    617. 

  617.         $body = quoted_printable_decode($body);
    618. 

  618.     } elseif ($encoding == 'base64') {
    619. 

  619.         $body = base64_decode($body);
    620. 

  620.     }
    621. 

  621. 

  622.     // All other encodings are returned raw.
    623. 

  623.     return $body;
    624. 

  624. }
    625. 

  625. 

  626. /**
    627. 

  627.  * Decodes headers
    628. 

  628.  *
    629. 

  629.  * This functions decode strings that is encoded according to
    630. 

  630.  * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
    631. 

  631.  * Patched by Christian Schmidt <christian@ostenfeld.dk>  23/03/2002
    632. 

  632.  */
    633. 

  633. function decodeHeader ($string, $utfencode=true,$htmlsave=true,$decide=false) {
    634. 

  634.     global $languages, $squirrelmail_language,$default_charset;
    635. 

  635.     if (is_array($string)) {
    636. 

  636.         $string = implode("\n", $string);
    637. 

  637.     }
    638. 

  638. 

  639.     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    640. 

  640.             function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    641. 

  641.         $string = $languages[$squirrelmail_language]['XTRA_CODE']('decodeheader', $string);
    642. 

  642.         // Do we need to return at this point?
    643. 

  643.         // return $string;
    644. 

  644.     }
    645. 

  645.     $i = 0;
    646. 

  646.     $iLastMatch = -2;
    647. 

  647.     $encoded = false;
    648. 

  648. 

  649.     $aString = explode(' ',$string);
    650. 

  650.     $ret = '';
    651. 

  651.     foreach ($aString as $chunk) {
    652. 

  652.         if ($encoded && $chunk === '') {
    653. 

  653.             continue;
    654. 

  654.         } elseif ($chunk === '') {
    655. 

  655.             $ret .= ' ';
    656. 

  656.             continue;
    657. 

  657.         }
    658. 

  658.         $encoded = false;
    659. 

  659.         /* if encoded words are not separated by a linear-space-white we still catch them */
    660. 

  660.         $j = $i-1;
    661. 

  661. 

  662.         while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
    663. 

  663.             /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
    664. 

  664.             if ($iLastMatch !== $j) {
    665. 

  665.                 if ($htmlsave) {
    666. 

  666.                     $ret .= '&#32;';
    667. 

  667.                 } else {
    668. 

  668.                     $ret .= ' ';
    669. 

  669.                 }
    670. 

  670.             }
    671. 

  671.             $iLastMatch = $i;
    672. 

  672.             $j = $i;
    673. 

  673.             if ($htmlsave) {
    674. 

  674.                 $ret .= htmlspecialchars($res[1]);
    675. 

  675.             } else {
    676. 

  676.                 $ret .= $res[1];
    677. 

  677.             }
    678. 

  678.             $encoding = ucfirst($res[3]);
    679. 

  679. 

  680.             /* decide about valid decoding */
    681. 

  681.             if ($decide && is_conversion_safe($res[2])) {
    682. 

  682.                 $can_be_encoded=true;
    683. 

  683.             } else {
    684. 

  684.                 $can_be_encoded=false;
    685. 

  685.             }
    686. 

  686. 

  687.             switch ($encoding)
    688. 

  688.             {
    689. 

  689.                 case 'B':
    690. 

  690.                     $replace = base64_decode($res[4]);
    691. 

  691.                     if ($can_be_encoded) {
    692. 

  692.                         // string is converted from one charset to another. sanitizing depends on $htmlsave
    693. 

  693.                         $replace =  charset_convert($res[2],$replace,$default_charset,$htmlsave);
    694. 

  694.                     } elseif ($utfencode) {
    695. 

  695.                         // string is converted to htmlentities and sanitized
    696. 

  696.                         $replace = charset_decode($res[2],$replace);
    697. 

  697.                     } elseif ($htmlsave) {
    698. 

  698.                         // string is not converted, but still sanitized
    699. 

  699.                         $replace = htmlspecialchars($replace);
    700. 

  700.                     }
    701. 

  701.                     $ret.= $replace;
    702. 

  702.                     break;
    703. 

  703.                 case 'Q':
    704. 

  704.                     $replace = str_replace('_', ' ', $res[4]);
    705. 

  705.                     $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
    706. 

  706.                             $replace);
    707. 

  707.                     if ($can_be_encoded) {
    708. 

  708.                         // string is converted from one charset to another. sanitizing depends on $htmlsave
    709. 

  709.                         $replace = charset_convert($res[2], $replace,$default_charset,$htmlsave);
    710. 

  710.                     } elseif ($utfencode) {
    711. 

  711.                         // string is converted to html entities and sanitized
    712. 

  712.                         $replace = charset_decode($res[2], $replace);
    713. 

  713.                     } elseif ($htmlsave) {
    714. 

  714.                         // string is not converted, but still sanizited
    715. 

  715.                         $replace = htmlspecialchars($replace);
    716. 

  716.                     }
    717. 

  717.                     $ret .= $replace;
    718. 

  718.                     break;
    719. 

  719.                 default:
    720. 

  720.                     break;
    721. 

  721.             }
    722. 

  722.             $chunk = $res[5];
    723. 

  723.             $encoded = true;
    724. 

  724.         }
    725. 

  725.         if (!$encoded) {
    726. 

  726.             if ($htmlsave) {
    727. 

  727.                 $ret .= '&#32;';
    728. 

  728.             } else {
    729. 

  729.                 $ret .= ' ';
    730. 

  730.             }
    731. 

  731.         }
    732. 

  732. 

  733.         if (!$encoded && $htmlsave) {
    734. 

  734.             $ret .= htmlspecialchars($chunk);
    735. 

  735.         } else {
    736. 

  736.             $ret .= $chunk;
    737. 

  737.         }
    738. 

  738.         ++$i;
    739. 

  739.     }
    740. 

  740.     /* remove the first added space */
    741. 

  741.     if ($ret) {
    742. 

  742.         if ($htmlsave) {
    743. 

  743.             $ret = substr($ret,5);
    744. 

  744.         } else {
    745. 

  745.             $ret = substr($ret,1);
    746. 

  746.         }
    747. 

  747.     }
    748. 

  748. 

  749.     return $ret;
    750. 

  750. }
    751. 

  751. 

  752. /**
    753. 

  753.  * Encodes header as quoted-printable
    754. 

  754.  *
    755. 

  755.  * Encode a string according to RFC 1522 for use in headers if it
    756. 

  756.  * contains 8-bit characters or anything that looks like it should
    757. 

  757.  * be encoded.
    758. 

  758.  */
    759. 

  759. function encodeHeader ($string) {
    760. 

  760.     global $default_charset, $languages, $squirrelmail_language;
    761. 

  761. 

  762.     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    763. 

  763.             function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    764. 

  764.         return  $languages[$squirrelmail_language]['XTRA_CODE']('encodeheader', $string);
    765. 

  765.     }
    766. 

  766. 

  767.     // Use B encoding for multibyte charsets
    768. 

  768.     $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
    769. 

  769.     if (in_array($default_charset,$mb_charsets) &&
    770. 

  770.         in_array($default_charset,sq_mb_list_encodings()) &&
    771. 

  771.         sq_is8bit($string)) {
    772. 

  772.         return encodeHeaderBase64($string,$default_charset);
    773. 

  773.     } elseif (in_array($default_charset,$mb_charsets) &&
    774. 

  774.               sq_is8bit($string) &&
    775. 

  775.               ! in_array($default_charset,sq_mb_list_encodings())) {
    776. 

  776.         // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
    777. 

  777.         // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
    778. 

  778.     }
    779. 

  779. 

  780.     // Encode only if the string contains 8-bit characters or =?
    781. 

  781.     $j = strlen($string);
    782. 

  782.     $max_l = 75 - strlen($default_charset) - 7;
    783. 

  783.     $aRet = array();
    784. 

  784.     $ret = '';
    785. 

  785.     $iEncStart = $enc_init = false;
    786. 

  786.     $cur_l = $iOffset = 0;
    787. 

  787.     for($i = 0; $i < $j; ++$i) {
    788. 

  788.         switch($string{$i})
    789. 

  789.         {
    790. 

  790.             case '"':
    791. 

  791.             case '=':
    792. 

  792.             case '<':
    793. 

  793.             case '>':
    794. 

  794.             case ',':
    795. 

  795.             case '?':
    796. 

  796.             case '_':
    797. 

  797.                 if ($iEncStart === false) {
    798. 

  798.                     $iEncStart = $i;
    799. 

  799.                 }
    800. 

  800.                 $cur_l+=3;
    801. 

  801.                 if ($cur_l > ($max_l-2)) {
    802. 

  802.                     /* if there is an stringpart that doesn't need encoding, add it */
    803. 

  803.                     $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    804. 

  804.                     $aRet[] = "=?$default_charset?Q?$ret?=";
    805. 

  805.                     $iOffset = $i;
    806. 

  806.                     $cur_l = 0;
    807. 

  807.                     $ret = '';
    808. 

  808.                     $iEncStart = false;
    809. 

  809.                 } else {
    810. 

  810.                     $ret .= sprintf("=%02X",ord($string{$i}));
    811. 

  811.                 }
    812. 

  812.                 break;
    813. 

  813.             case '(':
    814. 

  814.             case ')':
    815. 

  815.                 if ($iEncStart !== false) {
    816. 

  816.                     $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    817. 

  817.                     $aRet[] = "=?$default_charset?Q?$ret?=";
    818. 

  818.                     $iOffset = $i;
    819. 

  819.                     $cur_l = 0;
    820. 

  820.                     $ret = '';
    821. 

  821.                     $iEncStart = false;
    822. 

  822.                 }
    823. 

  823.                 break;
    824. 

  824.             case ' ':
    825. 

  825.                 if ($iEncStart !== false) {
    826. 

  826.                     $cur_l++;
    827. 

  827.                     if ($cur_l > $max_l) {
    828. 

  828.                         $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    829. 

  829.                         $aRet[] = "=?$default_charset?Q?$ret?=";
    830. 

  830.                         $iOffset = $i;
    831. 

  831.                         $cur_l = 0;
    832. 

  832.                         $ret = '';
    833. 

  833.                         $iEncStart = false;
    834. 

  834.                     } else {
    835. 

  835.                         $ret .= '_';
    836. 

  836.                     }
    837. 

  837.                 }
    838. 

  838.                 break;
    839. 

  839.             default:
    840. 

  840.                 $k = ord($string{$i});
    841. 

  841.                 if ($k > 126) {
    842. 

  842.                     if ($iEncStart === false) {
    843. 

  843.                         // do not start encoding in the middle of a string, also take the rest of the word.
    844. 

  844.                         $sLeadString = substr($string,0,$i);
    845. 

  845.                         $aLeadString = explode(' ',$sLeadString);
    846. 

  846.                         $sToBeEncoded = array_pop($aLeadString);
    847. 

  847.                         $iEncStart = $i - strlen($sToBeEncoded);
    848. 

  848.                         $ret .= $sToBeEncoded;
    849. 

  849.                         $cur_l += strlen($sToBeEncoded);
    850. 

  850.                     }
    851. 

  851.                     $cur_l += 3;
    852. 

  852.                     /* first we add the encoded string that reached it's max size */
    853. 

  853.                     if ($cur_l > ($max_l-2)) {
    854. 

  854.                         $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    855. 

  855.                         $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
    856. 

  856.                         $cur_l = 3;
    857. 

  857.                         $ret = '';
    858. 

  858.                         $iOffset = $i;
    859. 

  859.                         $iEncStart = $i;
    860. 

  860.                     }
    861. 

  861.                     $enc_init = true;
    862. 

  862.                     $ret .= sprintf("=%02X", $k);
    863. 

  863.                 } else {
    864. 

  864.                     if ($iEncStart !== false) {
    865. 

  865.                         $cur_l++;
    866. 

  866.                         if ($cur_l > $max_l) {
    867. 

  867.                             $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    868. 

  868.                             $aRet[] = "=?$default_charset?Q?$ret?=";
    869. 

  869.                             $iEncStart = false;
    870. 

  870.                             $iOffset = $i;
    871. 

  871.                             $cur_l = 0;
    872. 

  872.                             $ret = '';
    873. 

  873.                         } else {
    874. 

  874.                             $ret .= $string{$i};
    875. 

  875.                         }
    876. 

  876.                     }
    877. 

  877.                 }
    878. 

  878.                 break;
    879. 

  879.         }
    880. 

  880.     }
    881. 

  881. 

  882.     if ($enc_init) {
    883. 

  883.         if ($iEncStart !== false) {
    884. 

  884.             $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    885. 

  885.             $aRet[] = "=?$default_charset?Q?$ret?=";
    886. 

  886.         } else {
    887. 

  887.             $aRet[] = substr($string,$iOffset);
    888. 

  888.         }
    889. 

  889.         $string = implode('',$aRet);
    890. 

  890.     }
    891. 

  891.     return $string;
    892. 

  892. }
    893. 

  893. 

  894. /**
    895. 

  895.  * Encodes string according to rfc2047 B encoding header formating rules
    896. 

  896.  *
    897. 

  897.  * It is recommended way to encode headers with character sets that store
    898. 

  898.  * symbols in more than one byte.
    899. 

  899.  *
    900. 

  900.  * Function requires mbstring support. If required mbstring functions are missing,
    901. 

  901.  * function returns false and sets E_USER_WARNING level error message.
    902. 

  902.  *
    903. 

  903.  * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
    904. 

  904.  * that mbstring functions will generate E_WARNING errors, if unsupported
    905. 

  905.  * character set is used. mb_encode_mimeheader function provided by php
    906. 

  906.  * mbstring extension is not used in order to get better control of header
    907. 

  907.  * encoding.
    908. 

  908.  *
    909. 

  909.  * Used php code functions - function_exists(), trigger_error(), strlen()
    910. 

  910.  * (is used with charset names and base64 strings). Used php mbstring
    911. 

  911.  * functions - mb_strlen and mb_substr.
    912. 

  912.  *
    913. 

  913.  * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
    914. 

  914.  * encoding), rfc 2822 (header folding)
    915. 

  915.  *
    916. 

  916.  * @param string $string header string that must be encoded
    917. 

  917.  * @param string $charset character set. Must be supported by mbstring extension.
    918. 

  918.  * Use sq_mb_list_encodings() to detect supported charsets.
    919. 

  919.  * @return string string encoded according to rfc2047 B encoding formating rules
    920. 

  920.  * @since 1.5.1 and 1.4.6
    921. 

  921.  */
    922. 

  922. function encodeHeaderBase64($string,$charset) {
    923. 

  923.     /**
    924. 

  924.      * Check mbstring function requirements.
    925. 

  925.      */
    926. 

  926.     if (! function_exists('mb_strlen') ||
    927. 

  927.         ! function_exists('mb_substr')) {
    928. 

  928.         // set E_USER_WARNING
    929. 

  929.         trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
    930. 

  930.         // return false
    931. 

  931.         return false;
    932. 

  932.     }
    933. 

  933. 

  934.     // initial return array
    935. 

  935.     $aRet = array();
    936. 

  936. 

  937.     /**
    938. 

  938.      * header length = 75 symbols max (same as in encodeHeader)
    939. 

  939.      * remove $charset length
    940. 

  940.      * remove =? ? ?= (5 chars)
    941. 

  941.      * remove 2 more chars (\r\n ?)
    942. 

  942.      */
    943. 

  943.     $iMaxLength = 75 - strlen($charset) - 7;
    944. 

  944. 

  945.     // set first character position
    946. 

  946.     $iStartCharNum = 0;
    947. 

  947. 

  948.     // loop through all characters. count characters and not bytes.
    949. 

  949.     for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
    950. 

  950.         // encode string from starting character to current character.
    951. 

  951.         $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
    952. 

  952. 

  953.         // Check encoded string length
    954. 

  954.         if(strlen($encoded_string)>$iMaxLength) {
    955. 

  955.             // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
    956. 

  956.             $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
    957. 

  957. 

  958.             // set new starting character
    959. 

  959.             $iStartCharNum = $iCharNum-1;
    960. 

  960. 

  961.             // encode last char (in case it is last character in string)
    962. 

  962.             $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
    963. 

  963.         } // if string is shorter than max length - add next character
    964. 

  964.     }
    965. 

  965. 

  966.     // add last encoded string to array
    967. 

  967.     $aRet[] = $encoded_string;
    968. 

  968. 

  969.     // set initial return string
    970. 

  970.     $sRet = '';
    971. 

  971. 

  972.     // loop through encoded strings
    973. 

  973.     foreach($aRet as $string) {
    974. 

  974.         // TODO: Do we want to control EOL (end-of-line) marker
    975. 

  975.         if ($sRet!='') $sRet.= " ";
    976. 

  976. 

  977.         // add header tags and encoded string to return string
    978. 

  978.         $sRet.= '=?'.$charset.'?B?'.$string.'?=';
    979. 

  979.     }
    980. 

  980. 

  981.     return $sRet;
    982. 

  982. }
    983. 

  983. 

  984. /* This function trys to locate the entity_id of a specific mime element */
    985. 

  985. function find_ent_id($id, $message) {
    986. 

  986.     for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
    987. 

  987.         if ($message->entities[$i]->header->type0 == 'multipart')  {
    988. 

  988.             $ret = find_ent_id($id, $message->entities[$i]);
    989. 

  989.         } else {
    990. 

  990.             if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
    991. 

  991. //                if (sq_check_save_extension($message->entities[$i])) {
    992. 

  992.                 return $message->entities[$i]->entity_id;
    993. 

  993. //                }
    994. 

  994.             } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
    995. 

  995.                 /**
    996. 

  996.                  * This is part of a fix for Outlook Express 6.x generating
    997. 

  997.                  * cid URLs without creating content-id headers
    998. 

  998.                  * @@JA - 20050207
    999. 

  999.                  */
    1000. 

  1000.                 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
    1001. 

  1001.                     return $message->entities[$i]->entity_id;
    1002. 

  1002.                 }
    1003. 

  1003.             }
    1004. 

  1004.         }
    1005. 

  1005.     }
    1006. 

  1006.     return $ret;
    1007. 

  1007. }
    1008. 

  1008. 

  1009. function sq_check_save_extension($message) {
    1010. 

  1010.     $filename = $message->getFilename();
    1011. 

  1011.     $ext = substr($filename, strrpos($filename,'.')+1);
    1012. 

  1012.     $save_extensions = array('jpg','jpeg','gif','png','bmp');
    1013. 

  1013.     return in_array($ext, $save_extensions);
    1014. 

  1014. }
    1015. 

  1015. 

  1016. 

  1017. /**
    1018. 

  1018.  ** HTMLFILTER ROUTINES
    1019. 

  1019.  */
    1020. 

  1020. 

  1021. /**
    1022. 

  1022.  * This function checks attribute values for entity-encoded values
    1023. 

  1023.  * and returns them translated into 8-bit strings so we can run
    1024. 

  1024.  * checks on them.
    1025. 

  1025.  *
    1026. 

  1026.  * @param  $attvalue A string to run entity check against.
    1027. 

  1027.  * @return           Nothing, modifies a reference value.
    1028. 

  1028.  */
    1029. 

  1029. function sq_defang(&$attvalue){
    1030. 

  1030.     $me = 'sq_defang';
    1031. 

  1031.     /**
    1032. 

  1032.      * Skip this if there aren't ampersands or backslashes.
    1033. 

  1033.      */
    1034. 

  1034.     if (strpos($attvalue, '&') === false
    1035. 

  1035.         && strpos($attvalue, '\\') === false){
    1036. 

  1036.         return;
    1037. 

  1037.     }
    1038. 

  1038.     $m = false;
    1039. 

  1039.     do {
    1040. 

  1040.         $m = false;
    1041. 

  1041.         $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
    1042. 

  1042.         $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
    1043. 

  1043.         $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
    1044. 

  1044.     } while ($m == true);
    1045. 

  1045.     $attvalue = stripslashes($attvalue);
    1046. 

  1046. }
    1047. 

  1047. 

  1048. /**
    1049. 

  1049.  * Kill any tabs, newlines, or carriage returns. Our friends the
    1050. 

  1050.  * makers of the browser with 95% market value decided that it'd
    1051. 

  1051.  * be funny to make "java[tab]script" be just as good as "javascript".
    1052. 

  1052.  *
    1053. 

  1053.  * @param  attvalue  The attribute value before extraneous spaces removed.
    1054. 

  1054.  * @return attvalue  Nothing, modifies a reference value.
    1055. 

  1055.  */
    1056. 

  1056. function sq_unspace(&$attvalue){
    1057. 

  1057.     $me = 'sq_unspace';
    1058. 

  1058.     if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
    1059. 

  1059.         $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
    1060. 

  1060.                                 Array('',   '',   '',   '',   ''), $attvalue);
    1061. 

  1061.     }
    1062. 

  1062. }
    1063. 

  1063. 

  1064. /**
    1065. 

  1065.  * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
    1066. 

  1066.  * IE as regular characters.
    1067. 

  1067.  *
    1068. 

  1068.  * @param  attvalue  The attribute value before dangerous characters are translated.
    1069. 

  1069.  * @return attvalue  Nothing, modifies a reference value.
    1070. 

  1070.  * @author Marc Groot Koerkamp.
    1071. 

  1071.  */
    1072. 

  1072. function sq_fixIE_idiocy(&$attvalue) {
    1073. 

  1073.     // remove NUL
    1074. 

  1074.     $attvalue = str_replace("\0", "", $attvalue);
    1075. 

  1075.     // remove comments
    1076. 

  1076.     $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
    1077. 

  1077. 

  1078.     // IE has the evil habit of accepting every possible value for the attribute expression.
    1079. 

  1079.     // The table below contains characters which are parsed by IE if they are used in the "expression"
    1080. 

  1080.     // attribute value.
    1081. 

  1081.     $aDangerousCharsReplacementTable = array(
    1082. 

  1082.                         array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
    1083. 

  1083.                               '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
    1084. 

  1084.                               '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
    1085. 

  1085.                               '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
    1086. 

  1086.                               '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
    1087. 

  1087.                               '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
    1088. 

  1088.                               '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
    1089. 

  1089.                               '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
    1090. 

  1090.                               '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
    1091. 

  1091.                               '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
    1092. 

  1092.                               '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
    1093. 

  1093.                               '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
    1094. 

  1094.                               '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
    1095. 

  1095.                               '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
    1096. 

  1096.                               '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
    1097. 

  1097.                               '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
    1098. 

  1098.                               '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
    1099. 

  1099.                               '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
    1100. 

  1100.                               '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
    1101. 

  1101.                               '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
    1102. 

  1102.                               '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
    1103. 

  1103.                               '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
    1104. 

  1104.                               '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
    1105. 

  1105.                               '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
    1106. 

  1106.                               "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */   // in unicode this is some Chinese char range
    1107. 

  1107.                               "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
    1108. 

  1108.                               "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
    1109. 

  1109.                               "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
    1110. 

  1110.                               "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
    1111. 

  1111.                               "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
    1112. 

  1112.                               "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
    1113. 

  1113.                               "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
    1114. 

  1114.                               "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
    1115. 

  1115.                               "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
    1116. 

  1116.                               "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
    1117. 

  1117.                               "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
    1118. 

  1118.                               "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
    1119. 

  1119.                               "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
    1120. 

  1120.                               "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
    1121. 

  1121.                               "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
    1122. 

  1122.                               "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
    1123. 

  1123.                               "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
    1124. 

  1124.                               "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
    1125. 

  1125.                               "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
    1126. 

  1126.                               "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
    1127. 

  1127.                               "\xCA\x9F", /* L UNICODE IPA Extension */
    1128. 

  1128.                               "\xCA\x80", /* R UNICODE IPA Extension */
    1129. 

  1129.                               "\xC9\xB4"),  /* N UNICODE IPA Extension */
    1130. 

  1130.                        array('l', 'l', 'r','r','n','n',
    1131. 

  1131.                              'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
    1132. 

  1132.                              'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
    1133. 

  1133.                              'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
    1134. 

  1134.     $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
    1135. 

  1135. 

  1136.     // Escapes are useful for special characters like "{}[]()'&. In other cases they are
    1137. 

  1137.     // used for XSS.
    1138. 

  1138.     $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
    1139. 

  1139. }
    1140. 

  1140. 

  1141. /**
    1142. 

  1142.  * This function returns the final tag out of the tag name, an array
    1143. 

  1143.  * of attributes, and the type of the tag. This function is called by
    1144. 

  1144.  * sq_sanitize internally.
    1145. 

  1145.  *
    1146. 

  1146.  * @param  $tagname  the name of the tag.
    1147. 

  1147.  * @param  $attary   the array of attributes and their values
    1148. 

  1148.  * @param  $tagtype  The type of the tag (see in comments).
    1149. 

  1149.  * @return           a string with the final tag representation.
    1150. 

  1150.  */
    1151. 

  1151. function sq_tagprint($tagname, $attary, $tagtype){
    1152. 

  1152.     $me = 'sq_tagprint';
    1153. 

  1153. 

  1154.     if ($tagtype == 2){
    1155. 

  1155.         $fulltag = '</' . $tagname . '>';
    1156. 

  1156.     } else {
    1157. 

  1157.         $fulltag = '<' . $tagname;
    1158. 

  1158.         if (is_array($attary) && sizeof($attary)){
    1159. 

  1159.             $atts = Array();
    1160. 

  1160.             while (list($attname, $attvalue) = each($attary)){
    1161. 

  1161.                 array_push($atts, "$attname=$attvalue");
    1162. 

  1162.             }
    1163. 

  1163.             $fulltag .= ' ' . join(" ", $atts);
    1164. 

  1164.         }
    1165. 

  1165.         if ($tagtype == 3){
    1166. 

  1166.             $fulltag .= ' /';
    1167. 

  1167.         }
    1168. 

  1168.         $fulltag .= '>';
    1169. 

  1169.     }
    1170. 

  1170.     return $fulltag;
    1171. 

  1171. }
    1172. 

  1172. 

  1173. /**
    1174. 

  1174.  * A small helper function to use with array_walk. Modifies a by-ref
    1175. 

  1175.  * value and makes it lowercase.
    1176. 

  1176.  *
    1177. 

  1177.  * @param  $val a value passed by-ref.
    1178. 

  1178.  * @return      void since it modifies a by-ref value.
    1179. 

  1179.  */
    1180. 

  1180. function sq_casenormalize(&$val){
    1181. 

  1181.     $val = strtolower($val);
    1182. 

  1182. }
    1183. 

  1183. 

  1184. /**
    1185. 

  1185.  * This function skips any whitespace from the current position within
    1186. 

  1186.  * a string and to the next non-whitespace value.
    1187. 

  1187.  *
    1188. 

  1188.  * @param  $body   the string
    1189. 

  1189.  * @param  $offset the offset within the string where we should start
    1190. 

  1190.  *                 looking for the next non-whitespace character.
    1191. 

  1191.  * @return         the location within the $body where the next
    1192. 

  1192.  *                 non-whitespace char is located.
    1193. 

  1193.  */
    1194. 

  1194. function sq_skipspace($body, $offset){
    1195. 

  1195.     $me = 'sq_skipspace';
    1196. 

  1196.     preg_match('/^(\s*)/s', substr($body, $offset), $matches);
    1197. 

  1197.     if (sizeof($matches{1})){
    1198. 

  1198.         $count = strlen($matches{1});
    1199. 

  1199.         $offset += $count;
    1200. 

  1200.     }
    1201. 

  1201.     return $offset;
    1202. 

  1202. }
    1203. 

  1203. 

  1204. /**
    1205. 

  1205.  * This function looks for the next character within a string.  It's
    1206. 

  1206.  * really just a glorified "strpos", except it catches if failures
    1207. 

  1207.  * nicely.
    1208. 

  1208.  *
    1209. 

  1209.  * @param  $body   The string to look for needle in.
    1210. 

  1210.  * @param  $offset Start looking from this position.
    1211. 

  1211.  * @param  $needle The character/string to look for.
    1212. 

  1212.  * @return         location of the next occurance of the needle, or
    1213. 

  1213.  *                 strlen($body) if needle wasn't found.
    1214. 

  1214.  */
    1215. 

  1215. function sq_findnxstr($body, $offset, $needle){
    1216. 

  1216.     $me  = 'sq_findnxstr';
    1217. 

  1217.     $pos = strpos($body, $needle, $offset);
    1218. 

  1218.     if ($pos === FALSE){
    1219. 

  1219.         $pos = strlen($body);
    1220. 

  1220.     }
    1221. 

  1221.     return $pos;
    1222. 

  1222. }
    1223. 

  1223. 

  1224. /**
    1225. 

  1225.  * This function takes a PCRE-style regexp and tries to match it
    1226. 

  1226.  * within the string.
    1227. 

  1227.  *
    1228. 

  1228.  * @param  $body   The string to look for needle in.
    1229. 

  1229.  * @param  $offset Start looking from here.
    1230. 

  1230.  * @param  $reg    A PCRE-style regex to match.
    1231. 

  1231.  * @return         Returns a false if no matches found, or an array
    1232. 

  1232.  *                 with the following members:
    1233. 

  1233.  *                 - integer with the location of the match within $body
    1234. 

  1234.  *                 - string with whatever content between offset and the match
    1235. 

  1235.  *                 - string with whatever it is we matched
    1236. 

  1236.  */
    1237. 

  1237. function sq_findnxreg($body, $offset, $reg){
    1238. 

  1238.     $me = 'sq_findnxreg';
    1239. 

  1239.     $matches = Array();
    1240. 

  1240.     $retarr = Array();
    1241. 

  1241.     preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
    1242. 

  1242.     if (!isset($matches{0}) || !$matches{0}){
    1243. 

  1243.         $retarr = false;
    1244. 

  1244.     } else {
    1245. 

  1245.         $retarr{0} = $offset + strlen($matches{1});
    1246. 

  1246.         $retarr{1} = $matches{1};
    1247. 

  1247.         $retarr{2} = $matches{2};
    1248. 

  1248.     }
    1249. 

  1249.     return $retarr;
    1250. 

  1250. }
    1251. 

  1251. 

  1252. /**
    1253. 

  1253.  * This function looks for the next tag.
    1254. 

  1254.  *
    1255. 

  1255.  * @param  $body   String where to look for the next tag.
    1256. 

  1256.  * @param  $offset Start looking from here.
    1257. 

  1257.  * @return         false if no more tags exist in the body, or
    1258. 

  1258.  *                 an array with the following members:
    1259. 

  1259.  *                 - string with the name of the tag
    1260. 

  1260.  *                 - array with attributes and their values
    1261. 

  1261.  *                 - integer with tag type (1, 2, or 3)
    1262. 

  1262.  *                 - integer where the tag starts (starting "<")
    1263. 

  1263.  *                 - integer where the tag ends (ending ">")
    1264. 

  1264.  *                 first three members will be false, if the tag is invalid.
    1265. 

  1265.  */
    1266. 

  1266. function sq_getnxtag($body, $offset){
    1267. 

  1267.     $me = 'sq_getnxtag';
    1268. 

  1268.     if ($offset > strlen($body)){
    1269. 

  1269.         return false;
    1270. 

  1270.     }
    1271. 

  1271.     $lt = sq_findnxstr($body, $offset, "<");
    1272. 

  1272.     if ($lt == strlen($body)){
    1273. 

  1273.         return false;
    1274. 

  1274.     }
    1275. 

  1275.     /**
    1276. 

  1276.      * We are here:
    1277. 

  1277.      * blah blah <tag attribute="value">
    1278. 

  1278.      * \---------^
    1279. 

  1279.      */
    1280. 

  1280.     $pos = sq_skipspace($body, $lt+1);
    1281. 

  1281.     if ($pos >= strlen($body)){
    1282. 

  1282.         return Array(false, false, false, $lt, strlen($body));
    1283. 

  1283.     }
    1284. 

  1284.     /**
    1285. 

  1285.      * There are 3 kinds of tags:
    1286. 

  1286.      * 1. Opening tag, e.g.:
    1287. 

  1287.      *    <a href="blah">
    1288. 

  1288.      * 2. Closing tag, e.g.:
    1289. 

  1289.      *    </a>
    1290. 

  1290.      * 3. XHTML-style content-less tag, e.g.:
    1291. 

  1291.      *    <img src="blah" />
    1292. 

  1292.      */
    1293. 

  1293.     $tagtype = false;
    1294. 

  1294.     switch (substr($body, $pos, 1)){
    1295. 

  1295.         case '/':
    1296. 

  1296.             $tagtype = 2;
    1297. 

  1297.             $pos++;
    1298. 

  1298.             break;
    1299. 

  1299.         case '!':
    1300. 

  1300.             /**
    1301. 

  1301.              * A comment or an SGML declaration.
    1302. 

  1302.              */
    1303. 

  1303.             if (substr($body, $pos+1, 2) == "--"){
    1304. 

  1304.                 $gt = strpos($body, "-->", $pos);
    1305. 

  1305.                 if ($gt === false){
    1306. 

  1306.                     $gt = strlen($body);
    1307. 

  1307.                 } else {
    1308. 

  1308.                     $gt += 2;
    1309. 

  1309.                 }
    1310. 

  1310.                 return Array(false, false, false, $lt, $gt);
    1311. 

  1311.             } else {
    1312. 

  1312.                 $gt = sq_findnxstr($body, $pos, ">");
    1313. 

  1313.                 return Array(false, false, false, $lt, $gt);
    1314. 

  1314.             }
    1315. 

  1315.             break;
    1316. 

  1316.         default:
    1317. 

  1317.             /**
    1318. 

  1318.              * Assume tagtype 1 for now. If it's type 3, we'll switch values
    1319. 

  1319.              * later.
    1320. 

  1320.              */
    1321. 

  1321.             $tagtype = 1;
    1322. 

  1322.             break;
    1323. 

  1323.     }
    1324. 

  1324. 

  1325.     $tag_start = $pos;
    1326. 

  1326.     $tagname = '';
    1327. 

  1327.     /**
    1328. 

  1328.      * Look for next [\W-_], which will indicate the end of the tag name.
    1329. 

  1329.      */
    1330. 

  1330.     $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
    1331. 

  1331.     if ($regary == false){
    1332. 

  1332.         return Array(false, false, false, $lt, strlen($body));
    1333. 

  1333.     }
    1334. 

  1334.     list($pos, $tagname, $match) = $regary;
    1335. 

  1335.     $tagname = strtolower($tagname);
    1336. 

  1336. 

  1337.     /**
    1338. 

  1338.      * $match can be either of these:
    1339. 

  1339.      * '>'  indicating the end of the tag entirely.
    1340. 

  1340.      * '\s' indicating the end of the tag name.
    1341. 

  1341.      * '/'  indicating that this is type-3 xhtml tag.
    1342. 

  1342.      *
    1343. 

  1343.      * Whatever else we find there indicates an invalid tag.
    1344. 

  1344.      */
    1345. 

  1345.     switch ($match){
    1346. 

  1346.         case '/':
    1347. 

  1347.             /**
    1348. 

  1348.              * This is an xhtml-style tag with a closing / at the
    1349. 

  1349.              * end, like so: <img src="blah" />. Check if it's followed
    1350. 

  1350.              * by the closing bracket. If not, then this tag is invalid
    1351. 

  1351.              */
    1352. 

  1352.             if (substr($body, $pos, 2) == "/>"){
    1353. 

  1353.                 $pos++;
    1354. 

  1354.                 $tagtype = 3;
    1355. 

  1355.             } else {
    1356. 

  1356.                 $gt = sq_findnxstr($body, $pos, ">");
    1357. 

  1357.                 $retary = Array(false, false, false, $lt, $gt);
    1358. 

  1358.                 return $retary;
    1359. 

  1359.             }
    1360. 

  1360.         case '>':
    1361. 

  1361.             return Array($tagname, false, $tagtype, $lt, $pos);
    1362. 

  1362.             break;
    1363. 

  1363.         default:
    1364. 

  1364.             /**
    1365. 

  1365.              * Check if it's whitespace
    1366. 

  1366.              */
    1367. 

  1367.             if (!preg_match('/\s/', $match)){
    1368. 

  1368.                 /**
    1369. 

  1369.                  * This is an invalid tag! Look for the next closing ">".
    1370. 

  1370.                  */
    1371. 

  1371.                 $gt = sq_findnxstr($body, $lt, ">");
    1372. 

  1372.                 return Array(false, false, false, $lt, $gt);
    1373. 

  1373.             }
    1374. 

  1374.             break;
    1375. 

  1375.     }
    1376. 

  1376. 

  1377.     /**
    1378. 

  1378.      * At this point we're here:
    1379. 

  1379.      * <tagname  attribute='blah'>
    1380. 

  1380.      * \-------^
    1381. 

  1381.      *
    1382. 

  1382.      * At this point we loop in order to find all attributes.
    1383. 

  1383.      */
    1384. 

  1384.     $attname = '';
    1385. 

  1385.     $atttype = false;
    1386. 

  1386.     $attary = Array();
    1387. 

  1387. 

  1388.     while ($pos <= strlen($body)){
    1389. 

  1389.         $pos = sq_skipspace($body, $pos);
    1390. 

  1390.         if ($pos == strlen($body)){
    1391. 

  1391.             /**
    1392. 

  1392.              * Non-closed tag.
    1393. 

  1393.              */
    1394. 

  1394.             return Array(false, false, false, $lt, $pos);
    1395. 

  1395.         }
    1396. 

  1396.         /**
    1397. 

  1397.          * See if we arrived at a ">" or "/>", which means that we reached
    1398. 

  1398.          * the end of the tag.
    1399. 

  1399.          */
    1400. 

  1400.         $matches = Array();
    1401. 

  1401.         if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
    1402. 

  1402.             /**
    1403. 

  1403.              * Yep. So we did.
    1404. 

  1404.              */
    1405. 

  1405.             $pos += strlen($matches{1});
    1406. 

  1406.             if ($matches{2} == "/>"){
    1407. 

  1407.                 $tagtype = 3;
    1408. 

  1408.                 $pos++;
    1409. 

  1409.             }
    1410. 

  1410.             return Array($tagname, $attary, $tagtype, $lt, $pos);
    1411. 

  1411.         }
    1412. 

  1412. 

  1413.         /**
    1414. 

  1414.          * There are several types of attributes, with optional
    1415. 

  1415.          * [:space:] between members.
    1416. 

  1416.          * Type 1:
    1417. 

  1417.          *   attrname[:space:]=[:space:]'CDATA'
    1418. 

  1418.          * Type 2:
    1419. 

  1419.          *   attrname[:space:]=[:space:]"CDATA"
    1420. 

  1420.          * Type 3:
    1421. 

  1421.          *   attr[:space:]=[:space:]CDATA
    1422. 

  1422.          * Type 4:
    1423. 

  1423.          *   attrname
    1424. 

  1424.          *
    1425. 

  1425.          * We leave types 1 and 2 the same, type 3 we check for
    1426. 

  1426.          * '"' and convert to "&quot" if needed, then wrap in
    1427. 

  1427.          * double quotes. Type 4 we convert into:
    1428. 

  1428.          * attrname="yes".
    1429. 

  1429.          */
    1430. 

  1430.         $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
    1431. 

  1431.         if ($regary == false){
    1432. 

  1432.             /**
    1433. 

  1433.              * Looks like body ended before the end of tag.
    1434. 

  1434.              */
    1435. 

  1435.             return Array(false, false, false, $lt, strlen($body));
    1436. 

  1436.         }
    1437. 

  1437.         list($pos, $attname, $match) = $regary;
    1438. 

  1438.         $attname = strtolower($attname);
    1439. 

  1439.         /**
    1440. 

  1440.          * We arrived at the end of attribute name. Several things possible
    1441. 

  1441.          * here:
    1442. 

  1442.          * '>'  means the end of the tag and this is attribute type 4
    1443. 

  1443.          * '/'  if followed by '>' means the same thing as above
    1444. 

  1444.          * '\s' means a lot of things -- look what it's followed by.
    1445. 

  1445.          *      anything else means the attribute is invalid.
    1446. 

  1446.          */
    1447. 

  1447.         switch($match){
    1448. 

  1448.             case '/':
    1449. 

  1449.                 /**
    1450. 

  1450.                  * This is an xhtml-style tag with a closing / at the
    1451. 

  1451.                  * end, like so: <img src="blah" />. Check if it's followed
    1452. 

  1452.                  * by the closing bracket. If not, then this tag is invalid
    1453. 

  1453.                  */
    1454. 

  1454.                 if (substr($body, $pos, 2) == "/>"){
    1455. 

  1455.                     $pos++;
    1456. 

  1456.                     $tagtype = 3;
    1457. 

  1457.                 } else {
    1458. 

  1458.                     $gt = sq_findnxstr($body, $pos, ">");
    1459. 

  1459.                     $retary = Array(false, false, false, $lt, $gt);
    1460. 

  1460.                     return $retary;
    1461. 

  1461.                 }
    1462. 

  1462.             case '>':
    1463. 

  1463.                 $attary{$attname} = '"yes"';
    1464. 

  1464.                 return Array($tagname, $attary, $tagtype, $lt, $pos);
    1465. 

  1465.                 break;
    1466. 

  1466.             default:
    1467. 

  1467.                 /**
    1468. 

  1468.                  * Skip whitespace and see what we arrive at.
    1469. 

  1469.                  */
    1470. 

  1470.                 $pos = sq_skipspace($body, $pos);
    1471. 

  1471.                 $char = substr($body, $pos, 1);
    1472. 

  1472.                 /**
    1473. 

  1473.                  * Two things are valid here:
    1474. 

  1474.                  * '=' means this is attribute type 1 2 or 3.
    1475. 

  1475.                  * \w means this was attribute type 4.
    1476. 

  1476.                  * anything else we ignore and re-loop. End of tag and
    1477. 

  1477.                  * invalid stuff will be caught by our checks at the beginning
    1478. 

  1478.                  * of the loop.
    1479. 

  1479.                  */
    1480. 

  1480.                 if ($char == "="){
    1481. 

  1481.                     $pos++;
    1482. 

  1482.                     $pos = sq_skipspace($body, $pos);
    1483. 

  1483.                     /**
    1484. 

  1484.                      * Here are 3 possibilities:
    1485. 

  1485.                      * "'"  attribute type 1
    1486. 

  1486.                      * '"'  attribute type 2
    1487. 

  1487.                      * everything else is the content of tag type 3
    1488. 

  1488.                      */
    1489. 

  1489.                     $quot = substr($body, $pos, 1);
    1490. 

  1490.                     if ($quot == "'"){
    1491. 

  1491.                         $regary = sq_findnxreg($body, $pos+1, "\'");
    1492. 

  1492.                         if ($regary == false){
    1493. 

  1493.                             return Array(false, false, false, $lt, strlen($body));
    1494. 

  1494.                         }
    1495. 

  1495.                         list($pos, $attval, $match) = $regary;
    1496. 

  1496.                         $pos++;
    1497. 

  1497.                         $attary{$attname} = "'" . $attval . "'";
    1498. 

  1498.                     } else if ($quot == '"'){
    1499. 

  1499.                         $regary = sq_findnxreg($body, $pos+1, '\"');
    1500. 

  1500.                         if ($regary == false){
    1501. 

  1501.                             return Array(false, false, false, $lt, strlen($body));
    1502. 

  1502.                         }
    1503. 

  1503.                         list($pos, $attval, $match) = $regary;
    1504. 

  1504.                         $pos++;
    1505. 

  1505.                         $attary{$attname} = '"' . $attval . '"';
    1506. 

  1506.                     } else {
    1507. 

  1507.                         /**
    1508. 

  1508.                          * These are hateful. Look for \s, or >.
    1509. 

  1509.                          */
    1510. 

  1510.                         $regary = sq_findnxreg($body, $pos, "[\s>]");
    1511. 

  1511.                         if ($regary == false){
    1512. 

  1512.                             return Array(false, false, false, $lt, strlen($body));
    1513. 

  1513.                         }
    1514. 

  1514.                         list($pos, $attval, $match) = $regary;
    1515. 

  1515.                         /**
    1516. 

  1516.                          * If it's ">" it will be caught at the top.
    1517. 

  1517.                          */
    1518. 

  1518.                         $attval = preg_replace("/\"/s", "&quot;", $attval);
    1519. 

  1519.                         $attary{$attname} = '"' . $attval . '"';
    1520. 

  1520.                     }
    1521. 

  1521.                 } else if (preg_match("|[\w/>]|", $char)) {
    1522. 

  1522.                     /**
    1523. 

  1523.                      * That was attribute type 4.
    1524. 

  1524.                      */
    1525. 

  1525.                     $attary{$attname} = '"yes"';
    1526. 

  1526.                 } else {
    1527. 

  1527.                     /**
    1528. 

  1528.                      * An illegal character. Find next '>' and return.
    1529. 

  1529.                      */
    1530. 

  1530.                     $gt = sq_findnxstr($body, $pos, ">");
    1531. 

  1531.                     return Array(false, false, false, $lt, $gt);
    1532. 

  1532.                 }
    1533. 

  1533.                 break;
    1534. 

  1534.         }
    1535. 

  1535.     }
    1536. 

  1536.     /**
    1537. 

  1537.      * The fact that we got here indicates that the tag end was never
    1538. 

  1538.      * found. Return invalid tag indication so it gets stripped.
    1539. 

  1539.      */
    1540. 

  1540.     return Array(false, false, false, $lt, strlen($body));
    1541. 

  1541. }
    1542. 

  1542. 

  1543. /**
    1544. 

  1544.  * Translates entities into literal values so they can be checked.
    1545. 

  1545.  *
    1546. 

  1546.  * @param $attvalue the by-ref value to check.
    1547. 

  1547.  * @param $regex    the regular expression to check against.
    1548. 

  1548.  * @param $hex      whether the entites are hexadecimal.
    1549. 

  1549.  * @return          True or False depending on whether there were matches.
    1550. 

  1550.  */
    1551. 

  1551. function sq_deent(&$attvalue, $regex, $hex=false){
    1552. 

  1552.     $me = 'sq_deent';
    1553. 

  1553.     $ret_match = false;
    1554. 

  1554.     preg_match_all($regex, $attvalue, $matches);
    1555. 

  1555.     if (is_array($matches) && sizeof($matches[0]) > 0){
    1556. 

  1556.         $repl = Array();
    1557. 

  1557.         for ($i = 0; $i < sizeof($matches[0]); $i++){
    1558. 

  1558.             $numval = $matches[1][$i];
    1559. 

  1559.             if ($hex){
    1560. 

  1560.                 $numval = hexdec($numval);
    1561. 

  1561.             }
    1562. 

  1562.             $repl{$matches[0][$i]} = chr($numval);
    1563. 

  1563.         }
    1564. 

  1564.         $attvalue = strtr($attvalue, $repl);
    1565. 

  1565.         return true;
    1566. 

  1566.     } else {
    1567. 

  1567.         return false;
    1568. 

  1568.     }
    1569. 

  1569. }
    1570. 

  1570. 

  1571. /**
    1572. 

  1572.  * This function runs various checks against the attributes.
    1573. 

  1573.  *
    1574. 

  1574.  * @param  $tagname         String with the name of the tag.
    1575. 

  1575.  * @param  $attary          Array with all tag attributes.
    1576. 

  1576.  * @param  $rm_attnames     See description for sq_sanitize
    1577. 

  1577.  * @param  $bad_attvals     See description for sq_sanitize
    1578. 

  1578.  * @param  $add_attr_to_tag See description for sq_sanitize
    1579. 

  1579.  * @param  $message         message object
    1580. 

  1580.  * @param  $id              message id
    1581. 

  1581.  * @param  $mailbox         mailbox
    1582. 

  1582.  * @return                  Array with modified attributes.
    1583. 

  1583.  */
    1584. 

  1584. function sq_fixatts($tagname,
    1585. 

  1585.                     $attary,
    1586. 

  1586.                     $rm_attnames,
    1587. 

  1587.                     $bad_attvals,
    1588. 

  1588.                     $add_attr_to_tag,
    1589. 

  1589.                     $message,
    1590. 

  1590.                     $id,
    1591. 

  1591.                     $mailbox
    1592. 

  1592.                     ){
    1593. 

  1593.     $me = 'sq_fixatts';
    1594. 

  1594.     while (list($attname, $attvalue) = each($attary)){
    1595. 

  1595.         /**
    1596. 

  1596.          * See if this attribute should be removed.
    1597. 

  1597.          */
    1598. 

  1598.         foreach ($rm_attnames as $matchtag=>$matchattrs){
    1599. 

  1599.             if (preg_match($matchtag, $tagname)){
    1600. 

  1600.                 foreach ($matchattrs as $matchattr){
    1601. 

  1601.                     if (preg_match($matchattr, $attname)){
    1602. 

  1602.                         unset($attary{$attname});
    1603. 

  1603.                         continue;
    1604. 

  1604.                     }
    1605. 

  1605.                 }
    1606. 

  1606.             }
    1607. 

  1607.         }
    1608. 

  1608. 

  1609.         /**
    1610. 

  1610.          * Workaround for IE quirks
    1611. 

  1611.          */
    1612. 

  1612.         sq_fixIE_idiocy($attvalue);
    1613. 

  1613. 

  1614.         /**
    1615. 

  1615.          * Remove any backslashes, entities, and extraneous whitespace.
    1616. 

  1616.          */
    1617. 

  1617.         $oldattvalue = $attvalue;
    1618. 

  1618.         sq_defang($attvalue);
    1619. 

  1619.         if ($attname == 'style' && $attvalue !== $oldattvalue) {
    1620. 

  1620.             // entities are used in the attribute value. In 99% of the cases it's there as XSS
    1621. 

  1621.             // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
    1622. 

  1622.             $attvalue = "idiocy";
    1623. 

  1623.             $attary{$attname} = $attvalue;
    1624. 

  1624.         }
    1625. 

  1625.         sq_unspace($attvalue);
    1626. 

  1626. 

  1627.         /**
    1628. 

  1628.          * Now let's run checks on the attvalues.
    1629. 

  1629.          * I don't expect anyone to comprehend this. If you do,
    1630. 

  1630.          * get in touch with me so I can drive to where you live and
    1631. 

  1631.          * shake your hand personally. :)
    1632. 

  1632.          */
    1633. 

  1633.         foreach ($bad_attvals as $matchtag=>$matchattrs){
    1634. 

  1634.             if (preg_match($matchtag, $tagname)){
    1635. 

  1635.                 foreach ($matchattrs as $matchattr=>$valary){
    1636. 

  1636.                     if (preg_match($matchattr, $attname)){
    1637. 

  1637.                         /**
    1638. 

  1638.                          * There are two arrays in valary.
    1639. 

  1639.                          * First is matches.
    1640. 

  1640.                          * Second one is replacements
    1641. 

  1641.                          */
    1642. 

  1642.                         list($valmatch, $valrepl) = $valary;
    1643. 

  1643.                         $newvalue =
    1644. 

  1644.                             preg_replace($valmatch, $valrepl, $attvalue);
    1645. 

  1645.                         if ($newvalue != $attvalue){
    1646. 

  1646.                             $attary{$attname} = $newvalue;
    1647. 

  1647.                             $attvalue = $newvalue;
    1648. 

  1648.                         }
    1649. 

  1649.                     }
    1650. 

  1650.                 }
    1651. 

  1651.             }
    1652. 

  1652.         }
    1653. 

  1653.         if ($attname == 'style') {
    1654. 

  1654.             if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
    1655. 

  1655.                 // 8bit and control characters in style attribute values can be used for XSS, remove them
    1656. 

  1656.                 $attary{$attname} = '"disallowed character"';
    1657. 

  1657.             }
    1658. 

  1658.             preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
    1659. 

  1659.             if (count($aMatch)) {
    1660. 

  1660.                 foreach($aMatch[1] as $sMatch) {
    1661. 

  1661.                     // url value
    1662. 

  1662.                     $urlvalue = $sMatch;
    1663. 

  1663.                     sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
    1664. 

  1664.                     $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
    1665. 

  1665.                 }
    1666. 

  1666.             }
    1667. 

  1667.         }
    1668. 

  1668.         /**
    1669. 

  1669.          * Use white list based filtering on attributes which can contain url's
    1670. 

  1670.          */
    1671. 

  1671.         else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
    1672. 

  1672.             sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
    1673. 

  1673.             $attary{$attname} = $attvalue;
    1674. 

  1674.         }
    1675. 

  1675.     }
    1676. 

  1676.     /**
    1677. 

  1677.      * See if we need to append any attributes to this tag.
    1678. 

  1678.      */
    1679. 

  1679.     foreach ($add_attr_to_tag as $matchtag=>$addattary){
    1680. 

  1680.         if (preg_match($matchtag, $tagname)){
    1681. 

  1681.             $attary = array_merge($attary, $addattary);
    1682. 

  1682.         }
    1683. 

  1683.     }
    1684. 

  1684.     return $attary;
    1685. 

  1685. }
    1686. 

  1686. 

  1687. /**
    1688. 

  1688.  * This function filters url's
    1689. 

  1689.  *
    1690. 

  1690.  * @param  $attvalue        String with attribute value to filter
    1691. 

  1691.  * @param  $message         message object
    1692. 

  1692.  * @param  $id               message id
    1693. 

  1693.  * @param  $mailbox         mailbox
    1694. 

  1694.  * @param  $sQuote          quoting characters around url's
    1695. 

  1695.  */
    1696. 

  1696. function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
    1697. 

  1697.     $attvalue = trim($attvalue);
    1698. 

  1698.     if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
    1699. 

  1699.         // remove the double quotes
    1700. 

  1700.         $sQuote = $attvalue[0];
    1701. 

  1701.         $attvalue = trim(substr($attvalue,1,-1));
    1702. 

  1702.     }
    1703. 

  1703. 

  1704.     // If there's no "view_unsafe_images" variable in the URL, turn unsafe
    1705. 

  1705.     // images off by default.
    1706. 

  1706.     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
    1707. 

  1707.         $view_unsafe_images = false;
    1708. 

  1708.     }
    1709. 

  1709. 

  1710.     $secremoveimg = '../images/' . _("sec_remove_eng.png");
    1711. 

  1711. 

  1712.     /**
    1713. 

  1713.      * Replace empty src tags with the blank image.  src is only used
    1714. 

  1714.      * for frames, images, and image inputs.  Doing a replace should
    1715. 

  1715.      * not affect them working as should be, however it will stop
    1716. 

  1716.      * IE from being kicked off when src for img tags are not set
    1717. 

  1717.      */
    1718. 

  1718.     if ($attvalue == '') {
    1719. 

  1719.         $attvalue = '"' . SM_PATH . 'images/blank.png"';
    1720. 

  1720.     } else {
    1721. 

  1721.         // first, disallow 8 bit characters and control characters
    1722. 

  1722.         if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
    1723. 

  1723.             switch ($attname) {
    1724. 

  1724.                 case 'href':
    1725. 

  1725.                     $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
    1726. 

  1726.                     break;
    1727. 

  1727.                 default:
    1728. 

  1728.                     $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
    1729. 

  1729.                     break;
    1730. 

  1730.             }
    1731. 

  1731.         } else {
    1732. 

  1732.             $aUrl = parse_url($attvalue);
    1733. 

  1733.             if (isset($aUrl['scheme'])) {
    1734. 

  1734.                 switch(strtolower($aUrl['scheme'])) {
    1735. 

  1735.                     case 'mailto':
    1736. 

  1736.                     case 'http':
    1737. 

  1737.                     case 'https':
    1738. 

  1738.                     case 'ftp':
    1739. 

  1739.                         if ($attname != 'href') {
    1740. 

  1740.                             if ($view_unsafe_images == false) {
    1741. 

  1741.                                 $attvalue = $sQuote . $secremoveimg . $sQuote;
    1742. 

  1742.                             } else {
    1743. 

  1743.                                 if (isset($aUrl['path'])) {
    1744. 

  1744. 

  1745.                                     // No one has been able to show that image URIs
    1746. 

  1746.                                     // can be exploited, so for now, no restrictions
    1747. 

  1747.                                     // are made at all.  If this proves to be a problem,
    1748. 

  1748.                                     // the commented-out code below can be of help.
    1749. 

  1749.                                     // (One consideration is that I see nothing in this
    1750. 

  1750.                                     // function that specifically says that we will
    1751. 

  1751.                                     // only ever arrive here when inspecting an image
    1752. 

  1752.                                     // tag, although that does seem to be the end
    1753. 

  1753.                                     // result - e.g., <script src="..."> where malicious
    1754. 

  1754.                                     // image URIs are in fact a problem are already
    1755. 

  1755.                                     // filtered out elsewhere.
    1756. 

  1756.                                     /* ---------------------------------
    1757. 

  1757.                                     // validate image extension.
    1758. 

  1758.                                     $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
    1759. 

  1759.                                     if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
    1760. 

  1760.                                         // If URI is to something other than
    1761. 

  1761.                                         // a regular image file, get the contents
    1762. 

  1762.                                         // and try to see if it is an image.
    1763. 

  1763.                                         // Don't use Fileinfo (finfo_file()) because
    1764. 

  1764.                                         // we'd need to make the admin configure the
    1765. 

  1765.                                         // location of the magic.mime file (FIXME: add finfo_file() support later?)
    1766. 

  1766.                                         //
    1767. 

  1767.                                         $mime_type = '';
    1768. 

  1768.                                         if (function_exists('mime_content_type')
    1769. 

  1769.                                          && ($FILE = @fopen($attvalue, 'rb', FALSE))) {
    1770. 

    1771. 

  1771.                                             // fetch file
    1772. 

  1772.                                             //
    1773. 

  1773.                                             $file_contents = '';
    1774. 

  1774.                                             while (!feof($FILE)) {
    1775. 

  1775.                                                 $file_contents .= fread($FILE, 8192);
    1776. 

  1776.                                             }
    1777. 

  1777.                                             fclose($FILE);
    1778. 

    1779. 

  1779.                                             // store file locally
    1780. 

  1780.                                             //
    1781. 

  1781.                                             global $attachment_dir, $username;
    1782. 

  1782.                                             $hashed_attachment_dir = getHashedDir($username, $attachment_dir);
    1783. 

  1783.                                             $localfilename = GenerateRandomString(32, '', 7);
    1784. 

  1784.                                             $full_localfilename = "$hashed_attachment_dir/$localfilename";
    1785. 

  1785.                                             while (file_exists($full_localfilename)) {
    1786. 

  1786.                                                 $localfilename = GenerateRandomString(32, '', 7);
    1787. 

  1787.                                                 $full_localfilename = "$hashed_attachment_dir/$localfilename";
    1788. 

  1788.                                             }
    1789. 

  1789.                                             $FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
    1790. 

  1790.                                             fwrite($FILE, $file_contents);
    1791. 

  1791.                                             fclose($FILE);
    1792. 

    1793. 

  1793.                                             // get mime type and remove file
    1794. 

  1794.                                             //
    1795. 

  1795.                                             $mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
    1796. 

  1796.                                             unlink("$hashed_attachment_dir/$localfilename");
    1797. 

  1797.                                         }
    1798. 

  1798.                                         // debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
    1799. 

  1799.                                         if (substr(strtolower($mime_type), 0, 5) != 'image') {
    1800. 

  1800.                                             $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
    1801. 

  1801.                                         }
    1802. 

  1802.                                     }
    1803. 

  1803.                                     --------------------------------- */
    1804. 

  1804.                                 } else {
    1805. 

  1805.                                     $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
    1806. 

  1806.                                 }
    1807. 

  1807.                             }
    1808. 

  1808.                         } else {
    1809. 

  1809.                             $attvalue = $sQuote . $attvalue . $sQuote;
    1810. 

  1810.                         }
    1811. 

  1811.                         break;
    1812. 

  1812.                     case 'outbind':
    1813. 

  1813.                         /**
    1814. 

  1814.                          * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
    1815. 

  1815.                          * One day MS might actually make it match something useful, for now, falling
    1816. 

  1816.                          * back to using cid2http, so we can grab the blank.png.
    1817. 

  1817.                          */
    1818. 

  1818.                         $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
    1819. 

  1819.                         break;
    1820. 

  1820.                     case 'cid':
    1821. 

  1821.                         /**
    1822. 

  1822.                             * Turn cid: urls into http-friendly ones.
    1823. 

  1823.                             */
    1824. 

  1824.                         $attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
    1825. 

  1825.                         break;
    1826. 

  1826.                     default:
    1827. 

  1827.                         $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
    1828. 

  1828.                         break;
    1829. 

  1829.                 }
    1830. 

  1830.             } else {
    1831. 

  1831.                 if (!(isset($aUrl['path']) && $aUrl['path'] == $secremoveimg)) {
    1832. 

  1832.                     // parse_url did not lead to satisfying result
    1833. 

  1833.                     $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
    1834. 

  1834.                 }
    1835. 

  1835.             }
    1836. 

  1836.         }
    1837. 

  1837.     }
    1838. 

  1838. }
    1839. 

  1839. 

  1840. /**
    1841. 

  1841.  * This function edits the style definition to make them friendly and
    1842. 

  1842.  * usable in SquirrelMail.
    1843. 

  1843.  *
    1844. 

  1844.  * @param  $message  the message object
    1845. 

  1845.  * @param  $id       the message id
    1846. 

  1846.  * @param  $content  a string with whatever is between <style> and </style>
    1847. 

  1847.  * @param  $mailbox  the message mailbox
    1848. 

  1848.  * @return           a string with edited content.
    1849. 

  1849.  */
    1850. 

  1850. function sq_fixstyle($body, $pos, $message, $id, $mailbox){
    1851. 

  1851.     // FIXME: Is the global "view_unsafe_images" really needed here?
    1852. 

  1852.     global $view_unsafe_images;
    1853. 

  1853.     $me = 'sq_fixstyle';
    1854. 

  1854. 

  1855.     // workaround for </style> in between comments
    1856. 

  1856.     $iCurrentPos = $pos;
    1857. 

  1857.     $content = '';
    1858. 

  1858.     $sToken = '';
    1859. 

  1859.     $bSucces = false;
    1860. 

  1860.     $bEndTag = false;
    1861. 

  1861.     for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
    1862. 

  1862.         $char = $body{$i};
    1863. 

  1863.         switch ($char) {
    1864. 

  1864.             case '<':
    1865. 

  1865.                 $sToken = $char;
    1866. 

  1866.                 break;
    1867. 

  1867.             case '/':
    1868. 

  1868.                  if ($sToken == '<') {
    1869. 

  1869.                     $sToken .= $char;
    1870. 

  1870.                     $bEndTag = true;
    1871. 

  1871.                  } else {
    1872. 

  1872.                     $content .= $char;
    1873. 

  1873.                  }
    1874. 

  1874.                  break;
    1875. 

  1875.             case '>':
    1876. 

  1876.                  if ($bEndTag) {
    1877. 

  1877.                     $sToken .= $char;
    1878. 

  1878.                     if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
    1879. 

  1879.                         $newpos = $i + 1;
    1880. 

  1880.                         $bSucces = true;
    1881. 

  1881.                         break 2;
    1882. 

  1882.                     } else {
    1883. 

  1883.                         $content .= $sToken;
    1884. 

  1884.                     }
    1885. 

  1885.                     $bEndTag = false;
    1886. 

  1886.                  } else {
    1887. 

  1887.                     $content .= $char;
    1888. 

  1888.                  }
    1889. 

  1889.                  break;
    1890. 

  1890.             case '!':
    1891. 

  1891.                 if ($sToken == '<') {
    1892. 

  1892.                     // possible comment
    1893. 

  1893.                     if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
    1894. 

  1894.                         $i = strpos($body,'-->',$i+3);
    1895. 

  1895.                         if ($i === false) { // no end comment
    1896. 

  1896.                             $i = strlen($body);
    1897. 

  1897.                         }
    1898. 

  1898.                         $sToken = '';
    1899. 

  1899.                     }
    1900. 

  1900.                 } else {
    1901. 

  1901.                     $content .= $char;
    1902. 

  1902.                 }
    1903. 

  1903.                 break;
    1904. 

  1904.             default:
    1905. 

  1905.                 if ($bEndTag) {
    1906. 

  1906.                     $sToken .= $char;
    1907. 

  1907.                 } else {
    1908. 

  1908.                     $content .= $char;
    1909. 

  1909.                 }
    1910. 

  1910.                 break;
    1911. 

  1911.         }
    1912. 

  1912.     }
    1913. 

  1913.     if ($bSucces == FALSE){
    1914. 

  1914.         return array(FALSE, strlen($body));
    1915. 

  1915.     }
    1916. 

  1916. 

  1917.     /**
    1918. 

  1918.      * First look for general BODY style declaration, which would be
    1919. 

  1919.      * like so:
    1920. 

  1920.      * body {background: blah-blah}
    1921. 

  1921.      * and change it to .bodyclass so we can just assign it to a <div>
    1922. 

  1922.      */
    1923. 

  1923.     $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
    1924. 

  1924.     $secremoveimg = '../images/' . _("sec_remove_eng.png");
    1925. 

  1925. 

  1926.     // first check for 8bit sequences and disallowed control characters
    1927. 

  1927.     if (preg_match('/[\16-\37\200-\377]+/',$content)) {
    1928. 

  1928.         $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
    1929. 

  1929.         return array($content, $newpos);
    1930. 

  1930.     }
    1931. 

  1931. 

  1932.     // IE Sucks hard. We have a special function for it.
    1933. 

  1933.     sq_fixIE_idiocy($content);
    1934. 

  1934. 

  1935.     // remove @import line
    1936. 

  1936.     $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
    1937. 

  1937. 

  1938.     /**
    1939. 

  1939.      * Fix url('blah') declarations.
    1940. 

  1940.      */
    1941. 

  1941.     // translate ur\l and variations into url (IE parses that)
    1942. 

  1942.     // TODO check if the sq_fixIE_idiocy function already handles this.
    1943. 

  1943.     $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",'url', $content);
    1944. 

  1944.     preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
    1945. 

  1945.     if (count($aMatch)) {
    1946. 

  1946.         $aValue = $aReplace = array();
    1947. 

  1947.         foreach($aMatch[1] as $sMatch) {
    1948. 

  1948.             // url value
    1949. 

  1949.             $urlvalue = $sMatch;
    1950. 

  1950.             sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
    1951. 

  1951.             $aValue[] = $sMatch;
    1952. 

  1952.             $aReplace[] = $urlvalue;
    1953. 

  1953.         }
    1954. 

  1954.         $content = str_replace($aValue,$aReplace,$content);
    1955. 

  1955.     }
    1956. 

  1956. 

  1957.     /**
    1958. 

  1958.      * Remove any backslashes, entities, and extraneous whitespace.
    1959. 

  1959.      */
    1960. 

  1960.     $contentTemp = $content;
    1961. 

  1961.     sq_defang($contentTemp);
    1962. 

  1962.     sq_unspace($contentTemp);
    1963. 

  1963. 

  1964.     /**
    1965. 

  1965.      * Fix stupid css declarations which lead to vulnerabilities
    1966. 

  1966.      * in IE.
    1967. 

  1967.      *
    1968. 

  1968.      * Also remove "position" attribute, as it can easily be set
    1969. 

  1969.      * to "fixed" or "absolute" with "left" and "top" attributes
    1970. 

  1970.      * of zero, taking over the whole content frame.  It can also
    1971. 

  1971.      * be set to relative and move itself anywhere it wants to,
    1972. 

  1972.      * displaying content in areas it shouldn't be allowed to touch.
    1973. 

  1973.      */
    1974. 

  1974.     $match   = Array('/\/\*.*\*\//',
    1975. 

  1975.                     '/expression/i',
    1976. 

  1976.                     '/behaviou*r/i',
    1977. 

  1977.                     '/binding/i',
    1978. 

  1978.                     '/include-source/i',
    1979. 

  1979.                     '/javascript/i',
    1980. 

  1980.                     '/script/i',
    1981. 

  1981.                     '/position/i');
    1982. 

  1982.     $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
    1983. 

  1983.     $contentNew = preg_replace($match, $replace, $contentTemp);
    1984. 

  1984.     if ($contentNew !== $contentTemp) {
    1985. 

  1985.         // insecure css declarations are used. From now on we don't care
    1986. 

  1986.         // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
    1987. 

  1987.         $content = $contentNew;
    1988. 

  1988.     }
    1989. 

  1989.     return array($content, $newpos);
    1990. 

  1990. }
    1991. 

  1991. 

  1992. 

  1993. /**
    1994. 

  1994.  * This function converts cid: url's into the ones that can be viewed in
    1995. 

  1995.  * the browser.
    1996. 

  1996.  *
    1997. 

  1997.  * @param  $message  the message object
    1998. 

  1998.  * @param  $id       the message id
    1999. 

  1999.  * @param  $cidurl   the cid: url.
    2000. 

  2000.  * @param  $mailbox  the message mailbox
    2001. 

  2001.  * @return           a string with a http-friendly url
    2002. 

  2002.  */
    2003. 

  2003. function sq_cid2http($message, $id, $cidurl, $mailbox){
    2004. 

  2004.     /**
    2005. 

  2005.      * Get rid of quotes.
    2006. 

  2006.      */
    2007. 

  2007.     $quotchar = substr($cidurl, 0, 1);
    2008. 

  2008.     if ($quotchar == '"' || $quotchar == "'"){
    2009. 

  2009.         $cidurl = str_replace($quotchar, "", $cidurl);
    2010. 

  2010.     } else {
    2011. 

  2011.         $quotchar = '';
    2012. 

  2012.     }
    2013. 

  2013.     $cidurl = substr(trim($cidurl), 4);
    2014. 

  2014. 

  2015.     $match_str = '/\{.*?\}\//';
    2016. 

  2016.     $str_rep = '';
    2017. 

  2017.     $cidurl = preg_replace($match_str, $str_rep, $cidurl);
    2018. 

  2018. 

  2019.     $linkurl = find_ent_id($cidurl, $message);
    2020. 

  2020.     /* in case of non-safe cid links $httpurl should be replaced by a sort of
    2021. 

  2021.        unsafe link image */
    2022. 

  2022.     $httpurl = '';
    2023. 

  2023. 

  2024.     /**
    2025. 

  2025.      * This is part of a fix for Outlook Express 6.x generating
    2026. 

  2026.      * cid URLs without creating content-id headers. These images are
    2027. 

  2027.      * not part of the multipart/related html mail. The html contains
    2028. 

  2028.      * <img src="cid:{some_id}/image_filename.ext"> references to
    2029. 

  2029.      * attached images with as goal to render them inline although
    2030. 

  2030.      * the attachment disposition property is not inline.
    2031. 

  2031.      */
    2032. 

  2032. 

  2033.     if (empty($linkurl)) {
    2034. 

  2034.         if (preg_match('/{.*}\//', $cidurl)) {
    2035. 

  2035.             $cidurl = preg_replace('/{.*}\//','', $cidurl);
    2036. 

  2036.             if (!empty($cidurl)) {
    2037. 

  2037.                 $linkurl = find_ent_id($cidurl, $message);
    2038. 

  2038.             }
    2039. 

  2039.         }
    2040. 

  2040.     }
    2041. 

  2041. 

  2042.     if (!empty($linkurl)) {
    2043. 

  2043.         $httpurl = $quotchar . SM_PATH . 'src/download.php?absolute_dl=true&amp;' .
    2044. 

  2044.             "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
    2045. 

  2045.             '&amp;ent_id=' . $linkurl . $quotchar;
    2046. 

  2046.     } else {
    2047. 

  2047.         /**
    2048. 

  2048.          * If we couldn't generate a proper img url, drop in a blank image
    2049. 

  2049.          * instead of sending back empty, otherwise it causes unusual behaviour
    2050. 

  2050.          */
    2051. 

  2051.         $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
    2052. 

  2052.     }
    2053. 

  2053. 

  2054.     return $httpurl;
    2055. 

  2055. }
    2056. 

  2056. 

  2057. /**
    2058. 

  2058.  * This function changes the <body> tag into a <div> tag since we
    2059. 

  2059.  * can't really have a body-within-body.
    2060. 

  2060.  *
    2061. 

  2061.  * @param  $attary   an array of attributes and values of <body>
    2062. 

  2062.  * @param  $mailbox  mailbox we're currently reading (for cid2http)
    2063. 

  2063.  * @param  $message  current message (for cid2http)
    2064. 

  2064.  * @param  $id       current message id (for cid2http)
    2065. 

  2065.  * @return           a modified array of attributes to be set for <div>
    2066. 

  2066.  */
    2067. 

  2067. function sq_body2div($attary, $mailbox, $message, $id){
    2068. 

  2068.     $me = 'sq_body2div';
    2069. 

  2069.     $divattary = Array('class' => "'bodyclass'");
    2070. 

  2070.     $bgcolor = '#ffffff';
    2071. 

  2071.     $text = '#000000';
    2072. 

  2072.     $styledef = '';
    2073. 

  2073.     if (is_array($attary) && sizeof($attary) > 0){
    2074. 

  2074.         foreach ($attary as $attname=>$attvalue){
    2075. 

  2075.             $quotchar = substr($attvalue, 0, 1);
    2076. 

  2076.             $attvalue = str_replace($quotchar, "", $attvalue);
    2077. 

  2077.             switch ($attname){
    2078. 

  2078.                 case 'background':
    2079. 

  2079.                     $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
    2080. 

  2080.                     $styledef .= "background-image: url('$attvalue'); ";
    2081. 

  2081.                     break;
    2082. 

  2082.                 case 'bgcolor':
    2083. 

  2083.                     $styledef .= "background-color: $attvalue; ";
    2084. 

  2084.                     break;
    2085. 

  2085.                 case 'text':
    2086. 

  2086.                     $styledef .= "color: $attvalue; ";
    2087. 

  2087.                     break;
    2088. 

  2088.             }
    2089. 

  2089.         }
    2090. 

  2090.         if (strlen($styledef) > 0){
    2091. 

  2091.             $divattary{"style"} = "\"$styledef\"";
    2092. 

  2092.         }
    2093. 

  2093.     }
    2094. 

  2094.     return $divattary;
    2095. 

  2095. }
    2096. 

  2096. 

  2097. /**
    2098. 

  2098.  * This is the main function and the one you should actually be calling.
    2099. 

  2099.  * There are several variables you should be aware of an which need
    2100. 

  2100.  * special description.
    2101. 

  2101.  *
    2102. 

  2102.  * Since the description is quite lengthy, see it here:
    2103. 

  2103.  * http://linux.duke.edu/projects/mini/htmlfilter/
    2104. 

  2104.  *
    2105. 

  2105.  * @param $body                 the string with HTML you wish to filter
    2106. 

  2106.  * @param $tag_list             see description above
    2107. 

  2107.  * @param $rm_tags_with_content see description above
    2108. 

  2108.  * @param $self_closing_tags    see description above
    2109. 

  2109.  * @param $force_tag_closing    see description above
    2110. 

  2110.  * @param $rm_attnames          see description above
    2111. 

  2111.  * @param $bad_attvals          see description above
    2112. 

  2112.  * @param $add_attr_to_tag      see description above
    2113. 

  2113.  * @param $message              message object
    2114. 

  2114.  * @param $id                   message id
    2115. 

  2115.  * @return                      sanitized html safe to show on your pages.
    2116. 

  2116.  */
    2117. 

  2117. function sq_sanitize($body,
    2118. 

  2118.                      $tag_list,
    2119. 

  2119.                      $rm_tags_with_content,
    2120. 

  2120.                      $self_closing_tags,
    2121. 

  2121.                      $force_tag_closing,
    2122. 

  2122.                      $rm_attnames,
    2123. 

  2123.                      $bad_attvals,
    2124. 

  2124.                      $add_attr_to_tag,
    2125. 

  2125.                      $message,
    2126. 

  2126.                      $id,
    2127. 

  2127.                      $mailbox
    2128. 

  2128.                      ){
    2129. 

  2129.     $me = 'sq_sanitize';
    2130. 

  2130.     $rm_tags = array_shift($tag_list);
    2131. 

  2131.     /**
    2132. 

  2132.      * Normalize rm_tags and rm_tags_with_content.
    2133. 

  2133.      */
    2134. 

  2134.     @array_walk($tag_list, 'sq_casenormalize');
    2135. 

  2135.     @array_walk($rm_tags_with_content, 'sq_casenormalize');
    2136. 

  2136.     @array_walk($self_closing_tags, 'sq_casenormalize');
    2137. 

  2137.     /**
    2138. 

  2138.      * See if tag_list is of tags to remove or tags to allow.
    2139. 

  2139.      * false  means remove these tags
    2140. 

  2140.      * true   means allow these tags
    2141. 

  2141.      */
    2142. 

  2142.     $curpos = 0;
    2143. 

  2143.     $open_tags = Array();
    2144. 

  2144.     $trusted = "\n<!-- begin sanitized html -->\n";
    2145. 

  2145.     $skip_content = false;
    2146. 

  2146.     /**
    2147. 

  2147.      * Take care of netscape's stupid javascript entities like
    2148. 

  2148.      * &{alert('boo')};
    2149. 

  2149.      */
    2150. 

  2150.     $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
    2151. 

  2151. 

  2152.     while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
    2153. 

  2153.         list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
    2154. 

  2154.         $free_content = substr($body, $curpos, $lt-$curpos);
    2155. 

  2155.         /**
    2156. 

  2156.          * Take care of <style>
    2157. 

  2157.          */
    2158. 

  2158.         if ($tagname == "style" && $tagtype == 1){
    2159. 

  2159.             list($free_content, $curpos) =
    2160. 

  2160.                 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
    2161. 

  2161.             if ($free_content != FALSE){
    2162. 

  2162.                 $attary = sq_fixatts($tagname,
    2163. 

  2163.                                      $attary,
    2164. 

  2164.                                      $rm_attnames,
    2165. 

  2165.                                      $bad_attvals,
    2166. 

  2166.                                      $add_attr_to_tag,
    2167. 

  2167.                                      $message,
    2168. 

  2168.                                      $id,
    2169. 

  2169.                                      $mailbox
    2170. 

  2170.                                      );
    2171. 

  2171.                 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
    2172. 

  2172.                 $trusted .= $free_content;
    2173. 

  2173.                 $trusted .= sq_tagprint($tagname, false, 2);
    2174. 

  2174.             }
    2175. 

  2175.             continue;
    2176. 

  2176.         }
    2177. 

  2177.         if ($skip_content == false){
    2178. 

  2178.             $trusted .= $free_content;
    2179. 

  2179.         }
    2180. 

  2180.         if ($tagname != FALSE){
    2181. 

  2181.             if ($tagtype == 2){
    2182. 

  2182.                 if ($skip_content == $tagname){
    2183. 

  2183.                     /**
    2184. 

  2184.                      * Got to the end of tag we needed to remove.
    2185. 

  2185.                      */
    2186. 

  2186.                     $tagname = false;
    2187. 

  2187.                     $skip_content = false;
    2188. 

  2188.                 } else {
    2189. 

  2189.                     if ($skip_content == false){
    2190. 

  2190.                         if ($tagname == "body"){
    2191. 

  2191.                             $tagname = "div";
    2192. 

  2192.                         }
    2193. 

  2193.                         if (isset($open_tags{$tagname}) &&
    2194. 

  2194.                                 $open_tags{$tagname} > 0){
    2195. 

  2195.                             $open_tags{$tagname}--;
    2196. 

  2196.                         } else {
    2197. 

  2197.                             $tagname = false;
    2198. 

  2198.                         }
    2199. 

  2199.                     }
    2200. 

  2200.                 }
    2201. 

  2201.             } else {
    2202. 

  2202.                 /**
    2203. 

  2203.                  * $rm_tags_with_content
    2204. 

  2204.                  */
    2205. 

  2205.                 if ($skip_content == false){
    2206. 

  2206.                     /**
    2207. 

  2207.                      * See if this is a self-closing type and change
    2208. 

  2208.                      * tagtype appropriately.
    2209. 

  2209.                      */
    2210. 

  2210.                     if ($tagtype == 1
    2211. 

  2211.                             && in_array($tagname, $self_closing_tags)){
    2212. 

  2212.                         $tagtype = 3;
    2213. 

  2213.                     }
    2214. 

  2214.                     /**
    2215. 

  2215.                      * See if we should skip this tag and any content
    2216. 

  2216.                      * inside it.
    2217. 

  2217.                      */
    2218. 

  2218.                     if ($tagtype == 1 &&
    2219. 

  2219.                             in_array($tagname, $rm_tags_with_content)){
    2220. 

  2220.                         $skip_content = $tagname;
    2221. 

  2221.                     } else {
    2222. 

  2222.                         if (($rm_tags == false
    2223. 

  2223.                                     && in_array($tagname, $tag_list)) ||
    2224. 

  2224.                                 ($rm_tags == true &&
    2225. 

  2225.                                  !in_array($tagname, $tag_list))){
    2226. 

  2226.                             $tagname = false;
    2227. 

  2227.                         } else {
    2228. 

  2228.                             /**
    2229. 

  2229.                              * Convert body into div.
    2230. 

  2230.                              */
    2231. 

  2231.                             if ($tagname == "body"){
    2232. 

  2232.                                 $tagname = "div";
    2233. 

  2233.                                 $attary = sq_body2div($attary, $mailbox,
    2234. 

  2234.                                         $message, $id);
    2235. 

  2235.                             }
    2236. 

  2236.                             if ($tagtype == 1){
    2237. 

  2237.                                 if (isset($open_tags{$tagname})){
    2238. 

  2238.                                     $open_tags{$tagname}++;
    2239. 

  2239.                                 } else {
    2240. 

  2240.                                     $open_tags{$tagname}=1;
    2241. 

  2241.                                 }
    2242. 

  2242.                             }
    2243. 

  2243.                             /**
    2244. 

  2244.                              * This is where we run other checks.
    2245. 

  2245.                              */
    2246. 

  2246.                             if (is_array($attary) && sizeof($attary) > 0){
    2247. 

  2247.                                 $attary = sq_fixatts($tagname,
    2248. 

  2248.                                                      $attary,
    2249. 

  2249.                                                      $rm_attnames,
    2250. 

  2250.                                                      $bad_attvals,
    2251. 

  2251.                                                      $add_attr_to_tag,
    2252. 

  2252.                                                      $message,
    2253. 

  2253.                                                      $id,
    2254. 

  2254.                                                      $mailbox
    2255. 

  2255.                                                      );
    2256. 

  2256.                             }
    2257. 

  2257.                         }
    2258. 

  2258.                     }
    2259. 

  2259.                 }
    2260. 

  2260.             }
    2261. 

  2261.             if ($tagname != false && $skip_content == false){
    2262. 

  2262.                 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
    2263. 

  2263.             }
    2264. 

  2264.         }
    2265. 

  2265.         $curpos = $gt+1;
    2266. 

  2266.     }
    2267. 

  2267.     $trusted .= substr($body, $curpos, strlen($body)-$curpos);
    2268. 

  2268.     if ($force_tag_closing == true){
    2269. 

  2269.         foreach ($open_tags as $tagname=>$opentimes){
    2270. 

  2270.             while ($opentimes > 0){
    2271. 

  2271.                 $trusted .= '</' . $tagname . '>';
    2272. 

  2272.                 $opentimes--;
    2273. 

  2273.             }
    2274. 

  2274.         }
    2275. 

  2275.         $trusted .= "\n";
    2276. 

  2276.     }
    2277. 

  2277.     $trusted .= "<!-- end sanitized html -->\n";
    2278. 

  2278.     return $trusted;
    2279. 

  2279. }
    2280. 

  2280. 

  2281. /**
    2282. 

  2282.  * This is a wrapper function to call html sanitizing routines.
    2283. 

  2283.  *
    2284. 

  2284.  * @param  $body  the body of the message
    2285. 

  2285.  * @param  $id    the id of the message
    2286. 

  2286.  * @param  boolean $take_mailto_links When TRUE, converts mailto: links
    2287. 

  2287.  *                                    into internal SM compose links
    2288. 

  2288.  *                                    (optional; default = TRUE)
    2289. 

  2289.  * @return        a string with html safe to display in the browser.
    2290. 

  2290.  */
    2291. 

  2291. function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
    2292. 

  2292. 

  2293.     require_once(SM_PATH . 'functions/url_parser.php');  // for $MailTo_PReg_Match
    2294. 

  2294. 

  2295.     global $attachment_common_show_images, $view_unsafe_images,
    2296. 

  2296.            $has_unsafe_images;
    2297. 

  2297.     /**
    2298. 

  2298.      * Don't display attached images in HTML mode.
    2299. 

  2299.      */
    2300. 

  2300.     $attachment_common_show_images = false;
    2301. 

  2301.     $tag_list = Array(
    2302. 

  2302.             false,
    2303. 

  2303.             "object",
    2304. 

  2304.             "meta",
    2305. 

  2305.             "html",
    2306. 

  2306.             "head",
    2307. 

  2307.             "base",
    2308. 

  2308.             "link",
    2309. 

  2309.             "frame",
    2310. 

  2310.             "iframe",
    2311. 

  2311.             "plaintext",
    2312. 

  2312.             "marquee"
    2313. 

  2313.             );
    2314. 

  2314. 

  2315.     $rm_tags_with_content = Array(
    2316. 

  2316.             "script",
    2317. 

  2317.             "applet",
    2318. 

  2318.             "embed",
    2319. 

  2319.             "title",
    2320. 

  2320.             "frameset",
    2321. 

  2321.             "xmp",
    2322. 

  2322.             "xml"
    2323. 

  2323.             );
    2324. 

  2324. 

  2325.     $self_closing_tags =  Array(
    2326. 

  2326.             "img",
    2327. 

  2327.             "br",
    2328. 

  2328.             "hr",
    2329. 

  2329.             "input",
    2330. 

  2330.             "outbind"
    2331. 

  2331.             );
    2332. 

  2332. 

  2333.     $force_tag_closing = true;
    2334. 

  2334. 

  2335.     $rm_attnames = Array(
    2336. 

  2336.             "/.*/" =>
    2337. 

  2337.             Array(
    2338. 

  2338.                 "/target/i",
    2339. 

  2339.                 "/^on.*/i",
    2340. 

  2340.                 "/^dynsrc/i",
    2341. 

  2341.                 "/^data.*/i",
    2342. 

  2342.                 "/^lowsrc.*/i"
    2343. 

  2343.                 )
    2344. 

  2344.             );
    2345. 

  2345. 

  2346.     $secremoveimg = "../images/" . _("sec_remove_eng.png");
    2347. 

  2347.     $bad_attvals = Array(
    2348. 

  2348.             "/.*/" =>
    2349. 

  2349.             Array(
    2350. 

  2350.                 "/^src|background/i" =>
    2351. 

  2351.                 Array(
    2352. 

  2352.                     Array(
    2353. 

  2353.                         "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
    2354. 

  2354.                         "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
    2355. 

  2355.                         "/^([\'\"])\s*about\s*:.*([\'\"])/si"
    2356. 

  2356.                         ),
    2357. 

  2357.                     Array(
    2358. 

  2358.                         "\\1$secremoveimg\\2",
    2359. 

  2359.                         "\\1$secremoveimg\\2",
    2360. 

  2360.                         "\\1$secremoveimg\\2"
    2361. 

  2361.                         )
    2362. 

  2362.                     ),
    2363. 

  2363.                 "/^href|action/i" =>
    2364. 

  2364.                 Array(
    2365. 

  2365.                     Array(
    2366. 

  2366.                         "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
    2367. 

  2367.                         "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
    2368. 

  2368.                         "/^([\'\"])\s*about\s*:.*([\'\"])/si"
    2369. 

  2369.                         ),
    2370. 

  2370.                     Array(
    2371. 

  2371.                         "\\1#\\1",
    2372. 

  2372.                         "\\1#\\1",
    2373. 

  2373.                         "\\1#\\1"
    2374. 

  2374.                         )
    2375. 

  2375.                     ),
    2376. 

  2376.         "/^style/i" =>
    2377. 

  2377.             Array(
    2378. 

  2378.                 Array(
    2379. 

  2379.                     "/\/\*.*\*\//",
    2380. 

  2380.                     "/expression/i",
    2381. 

  2381.                     "/binding/i",
    2382. 

  2382.                     "/behaviou*r/i",
    2383. 

  2383.                     "/include-source/i",
    2384. 

  2384. 

  2385.                     // position:relative can also be exploited
    2386. 

  2386.                     // to put content outside of email body area
    2387. 

  2387.                     // and position:fixed is similarly exploitable
    2388. 

  2388.                     // as position:absolute, so we'll remove it
    2389. 

  2389.                     // altogether....
    2390. 

  2390.                     //
    2391. 

  2391.                     // Does this screw up legitimate HTML messages?
    2392. 

  2392.                     // If so, the only fix I see is to allow position
    2393. 

  2393.                     // attributes (any values?  I think we still have
    2394. 

  2394.                     // to block static and fixed) only if $use_iframe
    2395. 

  2395.                     // is enabled (1.5.0+)
    2396. 

  2396.                     //
    2397. 

  2397.                     // was:   "/position\s*:\s*absolute/i",
    2398. 

  2398.                     //
    2399. 

  2399.                     "/position\s*:/i",
    2400. 

  2400. 

  2401.                     "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
    2402. 

  2402.                     "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
    2403. 

  2403.                     "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
    2404. 

  2404.                     "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
    2405. 

  2405.                     "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
    2406. 

  2406.                     ),
    2407. 

  2407.                 Array(
    2408. 

  2408.                     "",
    2409. 

  2409.                     "idiocy",
    2410. 

  2410.                     "idiocy",
    2411. 

  2411.                     "idiocy",
    2412. 

  2412.                     "idiocy",
    2413. 

  2413.                     "idiocy",
    2414. 

  2414.                     "url",
    2415. 

  2415.                     "url(\\1#\\1)",
    2416. 

  2416.                     "url(\\1#\\1)",
    2417. 

  2417.                     "url(\\1#\\1)",
    2418. 

  2418.                     "\\1:url(\\2#\\3)"
    2419. 

  2419.                     )
    2420. 

  2420.                 )
    2421. 

  2421.             )
    2422. 

  2422.         );
    2423. 

  2423. 

  2424.     // If there's no "view_unsafe_images" variable in the URL, turn unsafe
    2425. 

  2425.     // images off by default.
    2426. 

  2426.     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
    2427. 

  2427.         $view_unsafe_images = false;
    2428. 

  2428.     }
    2429. 

  2429. 

  2430.     if (!$view_unsafe_images){
    2431. 

  2431.         /**
    2432. 

  2432.          * Remove any references to http/https if view_unsafe_images set
    2433. 

  2433.          * to false.
    2434. 

  2434.          */
    2435. 

  2435.         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
    2436. 

  2436.                 '/^([\'\"])\s*https*:.*([\'\"])/si');
    2437. 

  2437.         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
    2438. 

  2438.                 "\\1$secremoveimg\\1");
    2439. 

  2439.         array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
    2440. 

  2440.                 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
    2441. 

  2441.         array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
    2442. 

  2442.                 "url(\\1$secremoveimg\\1)");
    2443. 

  2443.     }
    2444. 

  2444. 

  2445.     $add_attr_to_tag = Array(
    2446. 

  2446.             "/^a$/i" =>
    2447. 

  2447.             Array('target'=>'"_blank"',
    2448. 

  2448.                 'title'=>'"'._("This external link will open in a new window").'"'
    2449. 

  2449.                 )
    2450. 

  2450.             );
    2451. 

  2451.     $trusted = sq_sanitize($body,
    2452. 

  2452.                            $tag_list,
    2453. 

  2453.                            $rm_tags_with_content,
    2454. 

  2454.                            $self_closing_tags,
    2455. 

  2455.                            $force_tag_closing,
    2456. 

  2456.                            $rm_attnames,
    2457. 

  2457.                            $bad_attvals,
    2458. 

  2458.                            $add_attr_to_tag,
    2459. 

  2459.                            $message,
    2460. 

  2460.                            $id,
    2461. 

  2461.                            $mailbox
    2462. 

  2462.                            );
    2463. 

  2463.     if (strpos($trusted,$secremoveimg)){
    2464. 

  2464.         $has_unsafe_images = true;
    2465. 

  2465.     }
    2466. 

  2466. 

  2467.     // we want to parse mailto's in HTML output, change to SM compose links
    2468. 

  2468.     // this is a modified version of code from url_parser.php... but Marc is
    2469. 

  2469.     // right: we need a better filtering implementation; adding this randomly
    2470. 

  2470.     // here is not a great solution
    2471. 

  2471.     //
    2472. 

  2472.     if ($take_mailto_links) {
    2473. 

  2473.         // parseUrl($trusted);   // this even parses URLs inside of tags... too aggressive
    2474. 

  2474.         global $MailTo_PReg_Match;
    2475. 

  2475.         $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
    2476. 

  2476.         if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
    2477. 

  2477.             foreach ($regs[0] as $i => $mailto_before) {
    2478. 

  2478.                 $mailto_params = $regs[10][$i];
    2479. 

  2479.                 // get rid of any tailing quote since we have to add send_to to the end
    2480. 

  2480.                 //
    2481. 

  2481.                 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
    2482. 

  2482.                     $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
    2483. 

  2483.                 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
    2484. 

  2484.                     $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
    2485. 

  2485. 

  2486.                 if ($regs[1][$i]) {    //if there is an email addr before '?', we need to merge it with the params
    2487. 

  2487.                     $to = 'to=' . $regs[1][$i];
    2488. 

  2488.                     if (strpos($mailto_params, 'to=') > -1)    //already a 'to='
    2489. 

  2489.                         $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
    2490. 

  2490.                     else {
    2491. 

  2491.                         if ($mailto_params)    //already some params, append to them
    2492. 

  2492.                             $mailto_params .= '&amp;' . $to;
    2493. 

  2493.                         else
    2494. 

  2494.                             $mailto_params .= '?' . $to;
    2495. 

  2495.                     }
    2496. 

  2496.                 }
    2497. 

  2497. 

  2498.                 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
    2499. 

  2499. 

  2500.                 // we'll already have target=_blank, no need to allow comp_in_new
    2501. 

  2501.                 // here (which would be a lot more work anyway)
    2502. 

  2502.                 //
    2503. 

  2503.                 global $compose_new_win;
    2504. 

  2504.                 $temp_comp_in_new = $compose_new_win;
    2505. 

  2505.                 $compose_new_win = 0;
    2506. 

  2506.                 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
    2507. 

  2507.                 $compose_new_win = $temp_comp_in_new;
    2508. 

  2508. 

  2509.                 // remove <a href=" and anything after the next quote (we only
    2510. 

  2510.                 // need the uri, not the link HTML) in compose uri
    2511. 

  2511.                 //
    2512. 

  2512.                 $comp_uri = substr($comp_uri, 9);
    2513. 

  2513.                 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
    2514. 

  2514.                 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
    2515. 

  2515.             }
    2516. 

  2516.         }
    2517. 

  2517.     }
    2518. 

  2518. 

  2519.     return $trusted;
    2520. 

  2520. }
    2521. 

  2521. 

  2522. /**
    2523. 

  2523.  * function SendDownloadHeaders - send file to the browser
    2524. 

  2524.  *
    2525. 

  2525.  * Original Source: SM core src/download.php
    2526. 

  2526.  * moved here to make it available to other code, and separate
    2527. 

  2527.  * front end from back end functionality.
    2528. 

  2528.  *
    2529. 

  2529.  * @param string $type0 first half of mime type
    2530. 

  2530.  * @param string $type1 second half of mime type
    2531. 

  2531.  * @param string $filename filename to tell the browser for downloaded file
    2532. 

  2532.  * @param boolean $force whether to force the download dialog to pop
    2533. 

  2533.  * @param optional integer $filesize send the Content-Header and length to the browser
    2534. 

  2534.  * @return void
    2535. 

  2535.  */
    2536. 

  2536. function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
    2537. 

  2537.     global $languages, $squirrelmail_language;
    2538. 

  2538.     $isIE = $isIE6plus = false;
    2539. 

  2539. 

  2540.     sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
    2541. 

  2541. 

  2542.     if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
    2543. 

  2543.             strstr($HTTP_USER_AGENT, 'Opera') === false) {
    2544. 

  2544.         $isIE = true;
    2545. 

  2545.     }
    2546. 

  2546. 

  2547.     if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
    2548. 

  2548.         ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
    2549. 

  2549.         $isIE6plus = true;
    2550. 

  2550.     }
    2551. 

  2551. 

  2552.     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    2553. 

  2553.             function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    2554. 

  2554.         $filename =
    2555. 

  2555.             $languages[$squirrelmail_language]['XTRA_CODE']('downloadfilename', $filename, $HTTP_USER_AGENT);
    2556. 

  2556.     } else {
    2557. 

  2557.         $filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace('&#32;', ' ', $filename));
    2558. 

  2558.     }
    2559. 

  2559. 

  2560.     // A Pox on Microsoft and it's Internet Explorer!
    2561. 

  2561.     //
    2562. 

  2562.     // IE has lots of bugs with file downloads.
    2563. 

  2563.     // It also has problems with SSL.  Both of these cause problems
    2564. 

  2564.     // for us in this function.
    2565. 

  2565.     //
    2566. 

  2566.     // See this article on Cache Control headers and SSL
    2567. 

  2567.     // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
    2568. 

  2568.     //
    2569. 

  2569.     // The best thing you can do for IE is to upgrade to the latest
    2570. 

  2570.     // version
    2571. 

  2571.     //set all the Cache Control Headers for IE
    2572. 

  2572.     if ($isIE) {
    2573. 

  2573.         $filename=rawurlencode($filename);
    2574. 

  2574.         header ("Pragma: public");
    2575. 

  2575.         header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
    2576. 

  2576.         header ("Cache-Control: post-check=0, pre-check=0", false);
    2577. 

  2577.         header ("Cache-Control: private");
    2578. 

  2578. 

  2579.         //set the inline header for IE, we'll add the attachment header later if we need it
    2580. 

  2580.         header ("Content-Disposition: inline; filename=$filename");
    2581. 

  2581.     }
    2582. 

  2582. 

  2583.     if (!$force) {
    2584. 

  2584.         // Try to show in browser window
    2585. 

  2585.         header ("Content-Disposition: inline; filename=\"$filename\"");
    2586. 

  2586.         header ("Content-Type: $type0/$type1; name=\"$filename\"");
    2587. 

  2587.     } else {
    2588. 

  2588.         // Try to pop up the "save as" box
    2589. 

  2589. 

  2590.         // IE makes this hard.  It pops up 2 save boxes, or none.
    2591. 

  2591.         // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
    2592. 

  2592.         // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
    2593. 

  2593.         // But, according to Microsoft, it is "RFC compliant but doesn't
    2594. 

  2594.         // take into account some deviations that allowed within the
    2595. 

  2595.         // specification."  Doesn't that mean RFC non-compliant?
    2596. 

  2596.         // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
    2597. 

  2597. 

  2598.         // all browsers need the application/octet-stream header for this
    2599. 

  2599.         header ("Content-Type: application/octet-stream; name=\"$filename\"");
    2600. 

  2600. 

  2601.         // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
    2602. 

  2602.         // Do not have quotes around filename, but that applied to
    2603. 

  2603.         // "attachment"... does it apply to inline too?
    2604. 

  2604.         header ("Content-Disposition: attachment; filename=\"$filename\"");
    2605. 

  2605. 

  2606.         if ($isIE && !$isIE6plus) {
    2607. 

  2607.             // This combination seems to work mostly.  IE 5.5 SP 1 has
    2608. 

  2608.             // known issues (see the Microsoft Knowledge Base)
    2609. 

  2609. 

  2610.             // This works for most types, but doesn't work with Word files
    2611. 

  2611.             header ("Content-Type: application/download; name=\"$filename\"");
    2612. 

  2612.             // This is to prevent IE for MIME sniffing and auto open a file in IE
    2613. 

  2613.             header ("Content-Type: application/force-download; name=\"$filename\"");
    2614. 

  2614.             // These are spares, just in case.  :-)
    2615. 

  2615.             //header("Content-Type: $type0/$type1; name=\"$filename\"");
    2616. 

  2616.             //header("Content-Type: application/x-msdownload; name=\"$filename\"");
    2617. 

  2617.             //header("Content-Type: application/octet-stream; name=\"$filename\"");
    2618. 

  2618.         } else if ($isIE) {
    2619. 

  2619.              // This is to prevent IE for MIME sniffing and auto open a file in IE
    2620. 

  2620.              header ("Content-Type: application/force-download; name=\"$filename\"");
    2621. 

  2621.         } else {
    2622. 

  2622.             // another application/octet-stream forces download for Netscape
    2623. 

  2623.             header ("Content-Type: application/octet-stream; name=\"$filename\"");
    2624. 

  2624.         }
    2625. 

  2625.     }
    2626. 

  2626. 

  2627.     //send the content-length header if the calling function provides it
    2628. 

  2628.     if ($filesize > 0) {
    2629. 

  2629.         header("Content-Length: $filesize");
    2630. 

  2630.     }
    2631. 

  2631. 

  2632. }  // end fn SendDownloadHeaders
    2633. 

  2633.