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/tags/rel-1_4_13/functions/mime.php

#
PHP | 2514 lines | 1651 code | 168 blank | 695 comment | 400 complexity | 2b3f2c25c64f233cc22c733a482068af 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 &copy; 1999-2007 The SquirrelMail Project Team
    10. 

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

  11.  * @version $Id: mime.php 12803 2007-12-05 20:21:46Z jangliss $
    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 (ereg('\\{([^\\}]*)\\}', $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 (ereg('"([^"]*)"', $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( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
    317. 

  317.         $view_unsafe_images = false;
    318. 

  318.     }
    319. 

  319. 

  320.     $body = '';
    321. 

  321.     $urlmailbox = urlencode($mailbox);
    322. 

  322.     $body_message = getEntity($message, $ent_num);
    323. 

  323.     if (($body_message->header->type0 == 'text') ||
    324. 

  324.             ($body_message->header->type0 == 'rfc822')) {
    325. 

  325.         $body = mime_fetch_body ($imap_stream, $id, $ent_num);
    326. 

  326.         $body = decodeBody($body, $body_message->header->encoding);
    327. 

  327. 

  328.         if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    329. 

  329.                 function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    330. 

  330.             if (mb_detect_encoding($body) != 'ASCII') {
    331. 

  331.                 $body = $languages[$squirrelmail_language]['XTRA_CODE']('decode', $body);
    332. 

  332.             }
    333. 

  333.         }
    334. 

  334.         $hookResults = do_hook("message_body", $body);
    335. 

  335.         $body = $hookResults[1];
    336. 

  336. 

  337.         /* If there are other types that shouldn't be formatted, add
    338. 

  338.          * them here.
    339. 

  339.          */
    340. 

  340. 

  341.         if ($body_message->header->type1 == 'html') {
    342. 

  342.             if ($show_html_default <> 1) {
    343. 

  343.                 $entity_conv = array('&nbsp;' => ' ',
    344. 

  344.                                      '<p>'    => "\n",
    345. 

  345.                                      '<P>'    => "\n",
    346. 

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

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

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

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

  350.                                      '&gt;'   => '>',
    351. 

  351.                                      '&lt;'   => '<');
    352. 

  352.                 $body = strtr($body, $entity_conv);
    353. 

  353.                 $body = strip_tags($body);
    354. 

  354.                 $body = trim($body);
    355. 

  355.                 translateText($body, $wrap_at,
    356. 

  356.                         $body_message->header->getParameter('charset'));
    357. 

  357.             } else {
    358. 

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

  359.                 if (!empty($charset))
    360. 

  360.                     $body = charset_decode($charset,$body,false,true);
    361. 

  361.                 $body = magicHTML($body, $id, $message, $mailbox);
    362. 

  362.             }
    363. 

  363.         } else {
    364. 

  364.             translateText($body, $wrap_at,
    365. 

  365.                     $body_message->header->getParameter('charset'));
    366. 

  366.         }
    367. 

  367. 

  368.         // if this is the clean display (i.e. printer friendly), stop here.
    369. 

  369.         if ( $clean ) {
    370. 

  370.             return $body;
    371. 

  371.         }
    372. 

  372. 

  373.         $download_and_unsafe_link = '';
    374. 

  374. 

  375.         $link = 'passed_id=' . $id . '&amp;ent_id='.$ent_num.
    376. 

  376.             '&amp;mailbox=' . $urlmailbox .'&amp;sort=' . $sort .
    377. 

  377.             '&amp;startMessage=' . $startMessage . '&amp;show_more=0';
    378. 

  378.         if (isset($passed_ent_id)) {
    379. 

  379.             $link .= '&amp;passed_ent_id='.$passed_ent_id;
    380. 

  380.         }
    381. 

  381.         $download_and_unsafe_link .= '&nbsp;|&nbsp;<a href="download.php?absolute_dl=true&amp;' .
    382. 

  382.             $link . '">' . _("Download this as a file") .  '</a>';
    383. 

  383.         if ($view_unsafe_images) {
    384. 

  384.             $text = _("Hide Unsafe Images");
    385. 

  385.         } else {
    386. 

  386.             if (isset($has_unsafe_images) && $has_unsafe_images) {
    387. 

  387.                 $link .= '&amp;view_unsafe_images=1';
    388. 

  388.                 $text = _("View Unsafe Images");
    389. 

  389.             } else {
    390. 

  390.                 $text = '';
    391. 

  391.             }
    392. 

  392.         }
    393. 

  393.         if($text != '') {
    394. 

  394.             $download_and_unsafe_link .= '&nbsp;|&nbsp;<a href="read_body.php?' . $link . '">' . $text . '</a>';
    395. 

  395.         }
    396. 

  396.     }
    397. 

  397.     return $body;
    398. 

  398. }
    399. 

  399. 

  400. 

  401. function formatAttachments($message, $exclude_id, $mailbox, $id) {
    402. 

  402.     global $where, $what, $startMessage, $color, $passed_ent_id;
    403. 

  403.     static $ShownHTML = 0;
    404. 

  404. 

  405.     $att_ar = $message->getAttachments($exclude_id);
    406. 

  406. 

  407.     if (!count($att_ar)) return '';
    408. 

  408. 

  409.     $attachments = '';
    410. 

  410. 

  411.     $urlMailbox = urlencode($mailbox);
    412. 

  412. 

  413.     foreach ($att_ar as $att) {
    414. 

  414.         $ent = $att->entity_id;
    415. 

  415.         $header = $att->header;
    416. 

  416.         $type0 = strtolower($header->type0);
    417. 

  417.         $type1 = strtolower($header->type1);
    418. 

  418.         $name = '';
    419. 

  419.         $links['download link']['text'] = _("Download");
    420. 

  420.         $links['download link']['href'] = SM_PATH .
    421. 

  421.             "src/download.php?absolute_dl=true&amp;passed_id=$id&amp;mailbox=$urlMailbox&amp;ent_id=$ent";
    422. 

  422.         $ImageURL = '';
    423. 

  423.         if ($type0 =='message' && $type1 == 'rfc822') {
    424. 

  424.             $default_page = SM_PATH . 'src/read_body.php';
    425. 

  425.             $rfc822_header = $att->rfc822_header;
    426. 

  426.             $filename = $rfc822_header->subject;
    427. 

  427.             if (trim( $filename ) == '') {
    428. 

  428.                 $filename = 'untitled-[' . $ent . ']' ;
    429. 

  429.             }
    430. 

  430.             $from_o = $rfc822_header->from;
    431. 

  431.             if (is_object($from_o)) {
    432. 

  432.                 $from_name = $from_o->getAddress(false);
    433. 

  433.             } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
    434. 

  434.                 // when a digest message is opened and you return to the digest
    435. 

  435.                 // now the from object is part of an array. This is a workaround.
    436. 

  436.                 $from_name = $from_o[0]->getAddress(false);
    437. 

  437.             } else {
    438. 

  438.                 $from_name = _("Unknown sender");
    439. 

  439.             }
    440. 

  440.             $from_name = decodeHeader(($from_name));
    441. 

  441.             $description = $from_name;
    442. 

  442.         } else {
    443. 

  443.             $default_page = SM_PATH . 'src/download.php';
    444. 

  444.             if (is_object($header->disposition)) {
    445. 

  445.                 $filename = $header->disposition->getProperty('filename');
    446. 

  446.                 if (trim($filename) == '') {
    447. 

  447.                     $name = decodeHeader($header->disposition->getProperty('name'));
    448. 

  448.                     if (trim($name) == '') {
    449. 

  449.                         $name = $header->getParameter('name');
    450. 

  450.                         if(trim($name) == '') {
    451. 

  451.                             if (trim( $header->id ) == '') {
    452. 

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

  453.                             } else {
    454. 

  454.                                 $filename = 'cid: ' . $header->id;
    455. 

  455.                             }
    456. 

  456.                         } else {
    457. 

  457.                             $filename = $name;
    458. 

  458.                         }
    459. 

  459.                     } else {
    460. 

  460.                         $filename = $name;
    461. 

  461.                     }
    462. 

  462.                 }
    463. 

  463.             } else {
    464. 

  464.                 $filename = $header->getParameter('name');
    465. 

  465.                 if (!trim($filename)) {
    466. 

  466.                     if (trim( $header->id ) == '') {
    467. 

  467.                         $filename = 'untitled-[' . $ent . ']' ;
    468. 

  468.                     } else {
    469. 

  469.                         $filename = 'cid: ' . $header->id;
    470. 

  470.                     }
    471. 

  471.                 }
    472. 

  472.             }
    473. 

  473.             if ($header->description) {
    474. 

  474.                 $description = decodeHeader($header->description);
    475. 

  475.             } else {
    476. 

  476.                 $description = '';
    477. 

  477.             }
    478. 

  478.         }
    479. 

  479. 

  480.         $display_filename = $filename;
    481. 

  481.         if (isset($passed_ent_id)) {
    482. 

  482.             $passed_ent_id_link = '&amp;passed_ent_id='.$passed_ent_id;
    483. 

  483.         } else {
    484. 

  484.             $passed_ent_id_link = '';
    485. 

  485.         }
    486. 

  486.         $defaultlink = $default_page . "?startMessage=$startMessage"
    487. 

  487.             . "&amp;passed_id=$id&amp;mailbox=$urlMailbox"
    488. 

  488.             . '&amp;ent_id='.$ent.$passed_ent_id_link;
    489. 

  489.         if ($where && $what) {
    490. 

  490.            $defaultlink .= '&amp;where='. urlencode($where).'&amp;what='.urlencode($what);
    491. 

  491.         }
    492. 

  492.         // IE does make use of mime content sniffing. Forcing a download
    493. 

  493.         // prohibit execution of XSS inside an application/octet-stream attachment
    494. 

  494.         if ($type0 == 'application' && $type1 == 'octet-stream') {
    495. 

  495.             $defaultlink .= '&amp;absolute_dl=true';
    496. 

  496.         }
    497. 

  497.         /* This executes the attachment hook with a specific MIME-type.
    498. 

  498.          * If that doesn't have results, it tries if there's a rule
    499. 

  499.          * for a more generic type. Finally, a hook for ALL attachment
    500. 

  500.          * types is run as well.
    501. 

  501.          */
    502. 

  502.         $hookresults = do_hook("attachment $type0/$type1", $links,
    503. 

  503.                 $startMessage, $id, $urlMailbox, $ent, $defaultlink,
    504. 

  504.                 $display_filename, $where, $what);
    505. 

  505.         if(count($hookresults[1]) <= 1) {
    506. 

  506.             $hookresults = do_hook("attachment $type0/*", $links,
    507. 

  507.                     $startMessage, $id, $urlMailbox, $ent, $defaultlink,
    508. 

  508.                     $display_filename, $where, $what);
    509. 

  509.         }
    510. 

  510.         $hookresults = do_hook("attachment */*", $hookresults[1],
    511. 

  511.                 $startMessage, $id, $urlMailbox, $ent, $hookresults[6],
    512. 

  512.                 $display_filename, $where, $what);
    513. 

  513. 

  514.         $links = $hookresults[1];
    515. 

  515.         $defaultlink = $hookresults[6];
    516. 

  516. 

  517.         $attachments .= '<tr><td>' .
    518. 

  518.             '<a href="'.$defaultlink.'">'.decodeHeader($display_filename).'</a>&nbsp;</td>' .
    519. 

  519.             '<td><small><b>' . show_readable_size($header->size) .
    520. 

  520.             '</b>&nbsp;&nbsp;</small></td>' .
    521. 

  521.             '<td><small>[ '.htmlspecialchars($type0).'/'.htmlspecialchars($type1).' ]&nbsp;</small></td>' .
    522. 

  522.             '<td><small>';
    523. 

  523.         $attachments .= '<b>' . $description . '</b>';
    524. 

  524.         $attachments .= '</small></td><td><small>&nbsp;';
    525. 

  525. 

  526.         $skipspaces = 1;
    527. 

  527.         foreach ($links as $val) {
    528. 

  528.             if ($skipspaces) {
    529. 

  529.                 $skipspaces = 0;
    530. 

  530.             } else {
    531. 

  531.                 $attachments .= '&nbsp;&nbsp;|&nbsp;&nbsp;';
    532. 

  532.             }
    533. 

  533.             $attachments .= '<a href="' . $val['href'] . '">' .  $val['text'] . '</a>';
    534. 

  534.         }
    535. 

  535.         unset($links);
    536. 

  536.         $attachments .= "</td></tr>\n";
    537. 

  537.     }
    538. 

  538.     return $attachments;
    539. 

  539. }
    540. 

  540. 

  541. function sqimap_base64_decode(&$string) {
    542. 

  542. 

  543.     // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
    544. 

  544.     // fly decoding (to reduce memory usage) you have to check if the
    545. 

  545.     // data has incomplete pairs
    546. 

  546. 

  547.     // Remove the noise in order to check if the 4 bytes pairs are complete
    548. 

  548.     $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
    549. 

  549. 

  550.     $sStringRem = '';
    551. 

  551.     $iMod = strlen($string) % 4;
    552. 

  552.     if ($iMod) {
    553. 

  553.         $sStringRem = substr($string,-$iMod);
    554. 

  554.         // Check if $sStringRem contains padding characters
    555. 

  555.         if (substr($sStringRem,-1) != '=') {
    556. 

  556.             $string = substr($string,0,-$iMod);
    557. 

  557.         } else {
    558. 

  558.             $sStringRem = '';
    559. 

  559.         }
    560. 

  560.     }
    561. 

  561.     $string = base64_decode($string);
    562. 

  562.     return $sStringRem;
    563. 

  563. }
    564. 

  564. 

  565. /**
    566. 

  566.  * Decodes encoded message body
    567. 

  567.  *
    568. 

  568.  * This function decodes the body depending on the encoding type.
    569. 

  569.  * Currently quoted-printable and base64 encodings are supported.
    570. 

  570.  * decode_body hook was added to this function in 1.4.2/1.5.0
    571. 

  571.  * @param string $body encoded message body
    572. 

  572.  * @param string $encoding used encoding
    573. 

  573.  * @return string decoded string
    574. 

  574.  * @since 1.0
    575. 

  575.  */
    576. 

  576. function decodeBody($body, $encoding) {
    577. 

  577. 

  578.     $body = str_replace("\r\n", "\n", $body);
    579. 

  579.     $encoding = strtolower($encoding);
    580. 

  580. 

  581.     $encoding_handler = do_hook_function('decode_body', $encoding);
    582. 

  582. 

  583.     // plugins get first shot at decoding the body
    584. 

  584.     if (!empty($encoding_handler) && function_exists($encoding_handler)) {
    585. 

  585.         $body = $encoding_handler('decode', $body);
    586. 

  586. 

  587.     } elseif ($encoding == 'quoted-printable' ||
    588. 

  588.             $encoding == 'quoted_printable') {
    589. 

  589.         /**
    590. 

  590.          * quoted_printable_decode() function is broken in older
    591. 

  591.          * php versions. Text with \r\n decoding was fixed only
    592. 

  592.          * in php 4.3.0. Minimal code requirement 4.0.4 +
    593. 

  593.          * str_replace("\r\n", "\n", $body); call.
    594. 

  594.          */
    595. 

  595.         $body = quoted_printable_decode($body);
    596. 

  596.     } elseif ($encoding == 'base64') {
    597. 

  597.         $body = base64_decode($body);
    598. 

  598.     }
    599. 

  599. 

  600.     // All other encodings are returned raw.
    601. 

  601.     return $body;
    602. 

  602. }
    603. 

  603. 

  604. /**
    605. 

  605.  * Decodes headers
    606. 

  606.  *
    607. 

  607.  * This functions decode strings that is encoded according to
    608. 

  608.  * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
    609. 

  609.  * Patched by Christian Schmidt <christian@ostenfeld.dk>  23/03/2002
    610. 

  610.  */
    611. 

  611. function decodeHeader ($string, $utfencode=true,$htmlsave=true,$decide=false) {
    612. 

  612.     global $languages, $squirrelmail_language,$default_charset;
    613. 

  613.     if (is_array($string)) {
    614. 

  614.         $string = implode("\n", $string);
    615. 

  615.     }
    616. 

  616. 

  617.     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    618. 

  618.             function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    619. 

  619.         $string = $languages[$squirrelmail_language]['XTRA_CODE']('decodeheader', $string);
    620. 

  620.         // Do we need to return at this point?
    621. 

  621.         // return $string;
    622. 

  622.     }
    623. 

  623.     $i = 0;
    624. 

  624.     $iLastMatch = -2;
    625. 

  625.     $encoded = false;
    626. 

  626. 

  627.     $aString = explode(' ',$string);
    628. 

  628.     $ret = '';
    629. 

  629.     foreach ($aString as $chunk) {
    630. 

  630.         if ($encoded && $chunk === '') {
    631. 

  631.             continue;
    632. 

  632.         } elseif ($chunk === '') {
    633. 

  633.             $ret .= ' ';
    634. 

  634.             continue;
    635. 

  635.         }
    636. 

  636.         $encoded = false;
    637. 

  637.         /* if encoded words are not separated by a linear-space-white we still catch them */
    638. 

  638.         $j = $i-1;
    639. 

  639. 

  640.         while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
    641. 

  641.             /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
    642. 

  642.             if ($iLastMatch !== $j) {
    643. 

  643.                 if ($htmlsave) {
    644. 

  644.                     $ret .= '&#32;';
    645. 

  645.                 } else {
    646. 

  646.                     $ret .= ' ';
    647. 

  647.                 }
    648. 

  648.             }
    649. 

  649.             $iLastMatch = $i;
    650. 

  650.             $j = $i;
    651. 

  651.             if ($htmlsave) {
    652. 

  652.                 $ret .= htmlspecialchars($res[1]);
    653. 

  653.             } else {
    654. 

  654.                 $ret .= $res[1];
    655. 

  655.             }
    656. 

  656.             $encoding = ucfirst($res[3]);
    657. 

  657. 

  658.             /* decide about valid decoding */
    659. 

  659.             if ($decide && is_conversion_safe($res[2])) {
    660. 

  660.                 $can_be_encoded=true;
    661. 

  661.             } else {
    662. 

  662.                 $can_be_encoded=false;
    663. 

  663.             }
    664. 

  664. 

  665.             switch ($encoding)
    666. 

  666.             {
    667. 

  667.                 case 'B':
    668. 

  668.                     $replace = base64_decode($res[4]);
    669. 

  669.                     if ($can_be_encoded) {
    670. 

  670.                         // string is converted from one charset to another. sanitizing depends on $htmlsave
    671. 

  671.                         $replace =  charset_convert($res[2],$replace,$default_charset,$htmlsave);
    672. 

  672.                     } elseif ($utfencode) {
    673. 

  673.                         // string is converted to htmlentities and sanitized
    674. 

  674.                         $replace = charset_decode($res[2],$replace);
    675. 

  675.                     } elseif ($htmlsave) {
    676. 

  676.                         // string is not converted, but still sanitized
    677. 

  677.                         $replace = htmlspecialchars($replace);
    678. 

  678.                     }
    679. 

  679.                     $ret.= $replace;
    680. 

  680.                     break;
    681. 

  681.                 case 'Q':
    682. 

  682.                     $replace = str_replace('_', ' ', $res[4]);
    683. 

  683.                     $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
    684. 

  684.                             $replace);
    685. 

  685.                     if ($can_be_encoded) {
    686. 

  686.                         // string is converted from one charset to another. sanitizing depends on $htmlsave
    687. 

  687.                         $replace = charset_convert($res[2], $replace,$default_charset,$htmlsave);
    688. 

  688.                     } elseif ($utfencode) {
    689. 

  689.                         // string is converted to html entities and sanitized
    690. 

  690.                         $replace = charset_decode($res[2], $replace);
    691. 

  691.                     } elseif ($htmlsave) {
    692. 

  692.                         // string is not converted, but still sanizited
    693. 

  693.                         $replace = htmlspecialchars($replace);
    694. 

  694.                     }
    695. 

  695.                     $ret .= $replace;
    696. 

  696.                     break;
    697. 

  697.                 default:
    698. 

  698.                     break;
    699. 

  699.             }
    700. 

  700.             $chunk = $res[5];
    701. 

  701.             $encoded = true;
    702. 

  702.         }
    703. 

  703.         if (!$encoded) {
    704. 

  704.             if ($htmlsave) {
    705. 

  705.                 $ret .= '&#32;';
    706. 

  706.             } else {
    707. 

  707.                 $ret .= ' ';
    708. 

  708.             }
    709. 

  709.         }
    710. 

  710. 

  711.         if (!$encoded && $htmlsave) {
    712. 

  712.             $ret .= htmlspecialchars($chunk);
    713. 

  713.         } else {
    714. 

  714.             $ret .= $chunk;
    715. 

  715.         }
    716. 

  716.         ++$i;
    717. 

  717.     }
    718. 

  718.     /* remove the first added space */
    719. 

  719.     if ($ret) {
    720. 

  720.         if ($htmlsave) {
    721. 

  721.             $ret = substr($ret,5);
    722. 

  722.         } else {
    723. 

  723.             $ret = substr($ret,1);
    724. 

  724.         }
    725. 

  725.     }
    726. 

  726. 

  727.     return $ret;
    728. 

  728. }
    729. 

  729. 

  730. /**
    731. 

  731.  * Encodes header as quoted-printable
    732. 

  732.  *
    733. 

  733.  * Encode a string according to RFC 1522 for use in headers if it
    734. 

  734.  * contains 8-bit characters or anything that looks like it should
    735. 

  735.  * be encoded.
    736. 

  736.  */
    737. 

  737. function encodeHeader ($string) {
    738. 

  738.     global $default_charset, $languages, $squirrelmail_language;
    739. 

  739. 

  740.     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    741. 

  741.             function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    742. 

  742.         return  $languages[$squirrelmail_language]['XTRA_CODE']('encodeheader', $string);
    743. 

  743.     }
    744. 

  744. 

  745.     // Use B encoding for multibyte charsets
    746. 

  746.     $mb_charsets = array('utf-8','big5','gb2313','euc-kr');
    747. 

  747.     if (in_array($default_charset,$mb_charsets) &&
    748. 

  748.         in_array($default_charset,sq_mb_list_encodings()) &&
    749. 

  749.         sq_is8bit($string)) {
    750. 

  750.         return encodeHeaderBase64($string,$default_charset);
    751. 

  751.     } elseif (in_array($default_charset,$mb_charsets) &&
    752. 

  752.               sq_is8bit($string) &&
    753. 

  753.               ! in_array($default_charset,sq_mb_list_encodings())) {
    754. 

  754.         // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php)
    755. 

  755.         // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE);
    756. 

  756.     }
    757. 

  757. 

  758.     // Encode only if the string contains 8-bit characters or =?
    759. 

  759.     $j = strlen($string);
    760. 

  760.     $max_l = 75 - strlen($default_charset) - 7;
    761. 

  761.     $aRet = array();
    762. 

  762.     $ret = '';
    763. 

  763.     $iEncStart = $enc_init = false;
    764. 

  764.     $cur_l = $iOffset = 0;
    765. 

  765.     for($i = 0; $i < $j; ++$i) {
    766. 

  766.         switch($string{$i})
    767. 

  767.         {
    768. 

  768.             case '=':
    769. 

  769.             case '<':
    770. 

  770.             case '>':
    771. 

  771.             case ',':
    772. 

  772.             case '?':
    773. 

  773.             case '_':
    774. 

  774.                 if ($iEncStart === false) {
    775. 

  775.                     $iEncStart = $i;
    776. 

  776.                 }
    777. 

  777.                 $cur_l+=3;
    778. 

  778.                 if ($cur_l > ($max_l-2)) {
    779. 

  779.                     /* if there is an stringpart that doesn't need encoding, add it */
    780. 

  780.                     $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    781. 

  781.                     $aRet[] = "=?$default_charset?Q?$ret?=";
    782. 

  782.                     $iOffset = $i;
    783. 

  783.                     $cur_l = 0;
    784. 

  784.                     $ret = '';
    785. 

  785.                     $iEncStart = false;
    786. 

  786.                 } else {
    787. 

  787.                     $ret .= sprintf("=%02X",ord($string{$i}));
    788. 

  788.                 }
    789. 

  789.                 break;
    790. 

  790.             case '(':
    791. 

  791.             case ')':
    792. 

  792.                 if ($iEncStart !== false) {
    793. 

  793.                     $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    794. 

  794.                     $aRet[] = "=?$default_charset?Q?$ret?=";
    795. 

  795.                     $iOffset = $i;
    796. 

  796.                     $cur_l = 0;
    797. 

  797.                     $ret = '';
    798. 

  798.                     $iEncStart = false;
    799. 

  799.                 }
    800. 

  800.                 break;
    801. 

  801.             case ' ':
    802. 

  802.                 if ($iEncStart !== false) {
    803. 

  803.                     $cur_l++;
    804. 

  804.                     if ($cur_l > $max_l) {
    805. 

  805.                         $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    806. 

  806.                         $aRet[] = "=?$default_charset?Q?$ret?=";
    807. 

  807.                         $iOffset = $i;
    808. 

  808.                         $cur_l = 0;
    809. 

  809.                         $ret = '';
    810. 

  810.                         $iEncStart = false;
    811. 

  811.                     } else {
    812. 

  812.                         $ret .= '_';
    813. 

  813.                     }
    814. 

  814.                 }
    815. 

  815.                 break;
    816. 

  816.             default:
    817. 

  817.                 $k = ord($string{$i});
    818. 

  818.                 if ($k > 126) {
    819. 

  819.                     if ($iEncStart === false) {
    820. 

  820.                         // do not start encoding in the middle of a string, also take the rest of the word.
    821. 

  821.                         $sLeadString = substr($string,0,$i);
    822. 

  822.                         $aLeadString = explode(' ',$sLeadString);
    823. 

  823.                         $sToBeEncoded = array_pop($aLeadString);
    824. 

  824.                         $iEncStart = $i - strlen($sToBeEncoded);
    825. 

  825.                         $ret .= $sToBeEncoded;
    826. 

  826.                         $cur_l += strlen($sToBeEncoded);
    827. 

  827.                     }
    828. 

  828.                     $cur_l += 3;
    829. 

  829.                     /* first we add the encoded string that reached it's max size */
    830. 

  830.                     if ($cur_l > ($max_l-2)) {
    831. 

  831.                         $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    832. 

  832.                         $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
    833. 

  833.                         $cur_l = 3;
    834. 

  834.                         $ret = '';
    835. 

  835.                         $iOffset = $i;
    836. 

  836.                         $iEncStart = $i;
    837. 

  837.                     }
    838. 

  838.                     $enc_init = true;
    839. 

  839.                     $ret .= sprintf("=%02X", $k);
    840. 

  840.                 } else {
    841. 

  841.                     if ($iEncStart !== false) {
    842. 

  842.                         $cur_l++;
    843. 

  843.                         if ($cur_l > $max_l) {
    844. 

  844.                             $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    845. 

  845.                             $aRet[] = "=?$default_charset?Q?$ret?=";
    846. 

  846.                             $iEncStart = false;
    847. 

  847.                             $iOffset = $i;
    848. 

  848.                             $cur_l = 0;
    849. 

  849.                             $ret = '';
    850. 

  850.                         } else {
    851. 

  851.                             $ret .= $string{$i};
    852. 

  852.                         }
    853. 

  853.                     }
    854. 

  854.                 }
    855. 

  855.                 break;
    856. 

  856.         }
    857. 

  857.     }
    858. 

  858. 

  859.     if ($enc_init) {
    860. 

  860.         if ($iEncStart !== false) {
    861. 

  861.             $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
    862. 

  862.             $aRet[] = "=?$default_charset?Q?$ret?=";
    863. 

  863.         } else {
    864. 

  864.             $aRet[] = substr($string,$iOffset);
    865. 

  865.         }
    866. 

  866.         $string = implode('',$aRet);
    867. 

  867.     }
    868. 

  868.     return $string;
    869. 

  869. }
    870. 

  870. 

  871. /**
    872. 

  872.  * Encodes string according to rfc2047 B encoding header formating rules
    873. 

  873.  *
    874. 

  874.  * It is recommended way to encode headers with character sets that store
    875. 

  875.  * symbols in more than one byte.
    876. 

  876.  *
    877. 

  877.  * Function requires mbstring support. If required mbstring functions are missing,
    878. 

  878.  * function returns false and sets E_USER_WARNING level error message.
    879. 

  879.  *
    880. 

  880.  * Minimal requirements - php 4.0.6 with mbstring extension. Please note,
    881. 

  881.  * that mbstring functions will generate E_WARNING errors, if unsupported
    882. 

  882.  * character set is used. mb_encode_mimeheader function provided by php
    883. 

  883.  * mbstring extension is not used in order to get better control of header
    884. 

  884.  * encoding.
    885. 

  885.  *
    886. 

  886.  * Used php code functions - function_exists(), trigger_error(), strlen()
    887. 

  887.  * (is used with charset names and base64 strings). Used php mbstring
    888. 

  888.  * functions - mb_strlen and mb_substr.
    889. 

  889.  *
    890. 

  890.  * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header
    891. 

  891.  * encoding), rfc 2822 (header folding)
    892. 

  892.  *
    893. 

  893.  * @param string $string header string that must be encoded
    894. 

  894.  * @param string $charset character set. Must be supported by mbstring extension.
    895. 

  895.  * Use sq_mb_list_encodings() to detect supported charsets.
    896. 

  896.  * @return string string encoded according to rfc2047 B encoding formating rules
    897. 

  897.  * @since 1.5.1 and 1.4.6
    898. 

  898.  */
    899. 

  899. function encodeHeaderBase64($string,$charset) {
    900. 

  900.     /**
    901. 

  901.      * Check mbstring function requirements.
    902. 

  902.      */
    903. 

  903.     if (! function_exists('mb_strlen') ||
    904. 

  904.         ! function_exists('mb_substr')) {
    905. 

  905.         // set E_USER_WARNING
    906. 

  906.         trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING);
    907. 

  907.         // return false
    908. 

  908.         return false;
    909. 

  909.     }
    910. 

  910. 

  911.     // initial return array
    912. 

  912.     $aRet = array();
    913. 

  913. 

  914.     /**
    915. 

  915.      * header length = 75 symbols max (same as in encodeHeader)
    916. 

  916.      * remove $charset length
    917. 

  917.      * remove =? ? ?= (5 chars)
    918. 

  918.      * remove 2 more chars (\r\n ?)
    919. 

  919.      */
    920. 

  920.     $iMaxLength = 75 - strlen($charset) - 7;
    921. 

  921. 

  922.     // set first character position
    923. 

  923.     $iStartCharNum = 0;
    924. 

  924. 

  925.     // loop through all characters. count characters and not bytes.
    926. 

  926.     for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) {
    927. 

  927.         // encode string from starting character to current character.
    928. 

  928.         $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
    929. 

  929. 

  930.         // Check encoded string length
    931. 

  931.         if(strlen($encoded_string)>$iMaxLength) {
    932. 

  932.             // if string exceeds max length, reduce number of encoded characters and add encoded string part to array
    933. 

  933.             $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset));
    934. 

  934. 

  935.             // set new starting character
    936. 

  936.             $iStartCharNum = $iCharNum-1;
    937. 

  937. 

  938.             // encode last char (in case it is last character in string)
    939. 

  939.             $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset));
    940. 

  940.         } // if string is shorter than max length - add next character
    941. 

  941.     }
    942. 

  942. 

  943.     // add last encoded string to array
    944. 

  944.     $aRet[] = $encoded_string;
    945. 

  945. 

  946.     // set initial return string
    947. 

  947.     $sRet = '';
    948. 

  948. 

  949.     // loop through encoded strings
    950. 

  950.     foreach($aRet as $string) {
    951. 

  951.         // TODO: Do we want to control EOL (end-of-line) marker
    952. 

  952.         if ($sRet!='') $sRet.= " ";
    953. 

  953. 

  954.         // add header tags and encoded string to return string
    955. 

  955.         $sRet.= '=?'.$charset.'?B?'.$string.'?=';
    956. 

  956.     }
    957. 

  957. 

  958.     return $sRet;
    959. 

  959. }
    960. 

  960. 

  961. /* This function trys to locate the entity_id of a specific mime element */
    962. 

  962. function find_ent_id($id, $message) {
    963. 

  963.     for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) {
    964. 

  964.         if ($message->entities[$i]->header->type0 == 'multipart')  {
    965. 

  965.             $ret = find_ent_id($id, $message->entities[$i]);
    966. 

  966.         } else {
    967. 

  967.             if (strcasecmp($message->entities[$i]->header->id, $id) == 0) {
    968. 

  968. //                if (sq_check_save_extension($message->entities[$i])) {
    969. 

  969.                 return $message->entities[$i]->entity_id;
    970. 

  970. //                }
    971. 

  971.             } elseif (!empty($message->entities[$i]->header->parameters['name'])) {
    972. 

  972.                 /**
    973. 

  973.                  * This is part of a fix for Outlook Express 6.x generating
    974. 

  974.                  * cid URLs without creating content-id headers
    975. 

  975.                  * @@JA - 20050207
    976. 

  976.                  */
    977. 

  977.                 if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) {
    978. 

  978.                     return $message->entities[$i]->entity_id;
    979. 

  979.                 }
    980. 

  980.             }
    981. 

  981.         }
    982. 

  982.     }
    983. 

  983.     return $ret;
    984. 

  984. }
    985. 

  985. 

  986. function sq_check_save_extension($message) {
    987. 

  987.     $filename = $message->getFilename();
    988. 

  988.     $ext = substr($filename, strrpos($filename,'.')+1);
    989. 

  989.     $save_extensions = array('jpg','jpeg','gif','png','bmp');
    990. 

  990.     return in_array($ext, $save_extensions);
    991. 

  991. }
    992. 

  992. 

  993. 

  994. /**
    995. 

  995.  ** HTMLFILTER ROUTINES
    996. 

  996.  */
    997. 

  997. 

  998. /**
    999. 

  999.  * This function checks attribute values for entity-encoded values
    1000. 

  1000.  * and returns them translated into 8-bit strings so we can run
    1001. 

  1001.  * checks on them.
    1002. 

  1002.  *
    1003. 

  1003.  * @param  $attvalue A string to run entity check against.
    1004. 

  1004.  * @return           Nothing, modifies a reference value.
    1005. 

  1005.  */
    1006. 

  1006. function sq_defang(&$attvalue){
    1007. 

  1007.     $me = 'sq_defang';
    1008. 

  1008.     /**
    1009. 

  1009.      * Skip this if there aren't ampersands or backslashes.
    1010. 

  1010.      */
    1011. 

  1011.     if (strpos($attvalue, '&') === false
    1012. 

  1012.         && strpos($attvalue, '\\') === false){
    1013. 

  1013.         return;
    1014. 

  1014.     }
    1015. 

  1015.     $m = false;
    1016. 

  1016.     do {
    1017. 

  1017.         $m = false;
    1018. 

  1018.         $m = $m || sq_deent($attvalue, '/\&#0*(\d+);*/s');
    1019. 

  1019.         $m = $m || sq_deent($attvalue, '/\&#x0*((\d|[a-f])+);*/si', true);
    1020. 

  1020.         $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true);
    1021. 

  1021.     } while ($m == true);
    1022. 

  1022.     $attvalue = stripslashes($attvalue);
    1023. 

  1023. }
    1024. 

  1024. 

  1025. /**
    1026. 

  1026.  * Kill any tabs, newlines, or carriage returns. Our friends the
    1027. 

  1027.  * makers of the browser with 95% market value decided that it'd
    1028. 

  1028.  * be funny to make "java[tab]script" be just as good as "javascript".
    1029. 

  1029.  *
    1030. 

  1030.  * @param  attvalue  The attribute value before extraneous spaces removed.
    1031. 

  1031.  * @return attvalue  Nothing, modifies a reference value.
    1032. 

  1032.  */
    1033. 

  1033. function sq_unspace(&$attvalue){
    1034. 

  1034.     $me = 'sq_unspace';
    1035. 

  1035.     if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){
    1036. 

  1036.         $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "),
    1037. 

  1037.                                 Array('',   '',   '',   '',   ''), $attvalue);
    1038. 

  1038.     }
    1039. 

  1039. }
    1040. 

  1040. 

  1041. /**
    1042. 

  1042.  * Translate all dangerous Unicode or Shift_JIS characters which are accepted by
    1043. 

  1043.  * IE as regular characters.
    1044. 

  1044.  *
    1045. 

  1045.  * @param  attvalue  The attribute value before dangerous characters are translated.
    1046. 

  1046.  * @return attvalue  Nothing, modifies a reference value.
    1047. 

  1047.  * @author Marc Groot Koerkamp.
    1048. 

  1048.  */
    1049. 

  1049. function sq_fixIE_idiocy(&$attvalue) {
    1050. 

  1050.     // remove NUL
    1051. 

  1051.     $attvalue = str_replace("\0", "", $attvalue);
    1052. 

  1052.     // remove comments
    1053. 

  1053.     $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue);
    1054. 

  1054. 

  1055.     // IE has the evil habit of accepting every possible value for the attribute expression.
    1056. 

  1056.     // The table below contains characters which are parsed by IE if they are used in the "expression"
    1057. 

  1057.     // attribute value.
    1058. 

  1058.     $aDangerousCharsReplacementTable = array(
    1059. 

  1059.                         array('&#x029F;', '&#0671;' ,/* L UNICODE IPA Extension */
    1060. 

  1060.                               '&#x0280;', '&#0640;' ,/* R UNICODE IPA Extension */
    1061. 

  1061.                               '&#x0274;', '&#0628;' ,/* N UNICODE IPA Extension */
    1062. 

  1062.                               '&#xFF25;', '&#65317;' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */
    1063. 

  1063.                               '&#xFF45;', '&#65349;' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */
    1064. 

  1064.                               '&#xFF38;', '&#65336;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */
    1065. 

  1065.                               '&#xFF58;', '&#65368;',/* Unicode FULLWIDTH LATIN SMALL LETTER X */
    1066. 

  1066.                               '&#xFF30;', '&#65328;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */
    1067. 

  1067.                               '&#xFF50;', '&#65360;',/* Unicode FULLWIDTH LATIN SMALL LETTER P */
    1068. 

  1068.                               '&#xFF32;', '&#65330;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */
    1069. 

  1069.                               '&#xFF52;', '&#65362;',/* Unicode FULLWIDTH LATIN SMALL LETTER R */
    1070. 

  1070.                               '&#xFF33;', '&#65331;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */
    1071. 

  1071.                               '&#xFF53;', '&#65363;',/* Unicode FULLWIDTH LATIN SMALL LETTER S */
    1072. 

  1072.                               '&#xFF29;', '&#65321;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */
    1073. 

  1073.                               '&#xFF49;', '&#65353;',/* Unicode FULLWIDTH LATIN SMALL LETTER I */
    1074. 

  1074.                               '&#xFF2F;', '&#65327;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */
    1075. 

  1075.                               '&#xFF4F;', '&#65359;',/* Unicode FULLWIDTH LATIN SMALL LETTER O */
    1076. 

  1076.                               '&#xFF2E;', '&#65326;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */
    1077. 

  1077.                               '&#xFF4E;', '&#65358;',/* Unicode FULLWIDTH LATIN SMALL LETTER N */
    1078. 

  1078.                               '&#xFF2C;', '&#65324;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */
    1079. 

  1079.                               '&#xFF4C;', '&#65356;',/* Unicode FULLWIDTH LATIN SMALL LETTER L */
    1080. 

  1080.                               '&#xFF35;', '&#65333;',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */
    1081. 

  1081.                               '&#xFF55;', '&#65365;',/* Unicode FULLWIDTH LATIN SMALL LETTER U */
    1082. 

  1082.                               '&#x207F;', '&#8319;' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */
    1083. 

  1083.                               "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */   // in unicode this is some Chinese char range
    1084. 

  1084.                               "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */
    1085. 

  1085.                               "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */
    1086. 

  1086.                               "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */
    1087. 

  1087.                               "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */
    1088. 

  1088.                               "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */
    1089. 

  1089.                               "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */
    1090. 

  1090.                               "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */
    1091. 

  1091.                               "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */
    1092. 

  1092.                               "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */
    1093. 

  1093.                               "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */
    1094. 

  1094.                               "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */
    1095. 

  1095.                               "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */
    1096. 

  1096.                               "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */
    1097. 

  1097.                               "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */
    1098. 

  1098.                               "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */
    1099. 

  1099.                               "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */
    1100. 

  1100.                               "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */
    1101. 

  1101.                               "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */
    1102. 

  1102.                               "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */
    1103. 

  1103.                               "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */
    1104. 

  1104.                               "\xCA\x9F", /* L UNICODE IPA Extension */
    1105. 

  1105.                               "\xCA\x80", /* R UNICODE IPA Extension */
    1106. 

  1106.                               "\xC9\xB4"),  /* N UNICODE IPA Extension */
    1107. 

  1107.                        array('l', 'l', 'r','r','n','n',
    1108. 

  1108.                              'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I',
    1109. 

  1109.                              'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n',
    1110. 

  1110.                              'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n'));
    1111. 

  1111.     $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue);
    1112. 

  1112. 

  1113.     // Escapes are useful for special characters like "{}[]()'&. In other cases they are
    1114. 

  1114.     // used for XSS.
    1115. 

  1115.     $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue);
    1116. 

  1116. }
    1117. 

  1117. 

  1118. /**
    1119. 

  1119.  * This function returns the final tag out of the tag name, an array
    1120. 

  1120.  * of attributes, and the type of the tag. This function is called by
    1121. 

  1121.  * sq_sanitize internally.
    1122. 

  1122.  *
    1123. 

  1123.  * @param  $tagname  the name of the tag.
    1124. 

  1124.  * @param  $attary   the array of attributes and their values
    1125. 

  1125.  * @param  $tagtype  The type of the tag (see in comments).
    1126. 

  1126.  * @return           a string with the final tag representation.
    1127. 

  1127.  */
    1128. 

  1128. function sq_tagprint($tagname, $attary, $tagtype){
    1129. 

  1129.     $me = 'sq_tagprint';
    1130. 

  1130. 

  1131.     if ($tagtype == 2){
    1132. 

  1132.         $fulltag = '</' . $tagname . '>';
    1133. 

  1133.     } else {
    1134. 

  1134.         $fulltag = '<' . $tagname;
    1135. 

  1135.         if (is_array($attary) && sizeof($attary)){
    1136. 

  1136.             $atts = Array();
    1137. 

  1137.             while (list($attname, $attvalue) = each($attary)){
    1138. 

  1138.                 array_push($atts, "$attname=$attvalue");
    1139. 

  1139.             }
    1140. 

  1140.             $fulltag .= ' ' . join(" ", $atts);
    1141. 

  1141.         }
    1142. 

  1142.         if ($tagtype == 3){
    1143. 

  1143.             $fulltag .= ' /';
    1144. 

  1144.         }
    1145. 

  1145.         $fulltag .= '>';
    1146. 

  1146.     }
    1147. 

  1147.     return $fulltag;
    1148. 

  1148. }
    1149. 

  1149. 

  1150. /**
    1151. 

  1151.  * A small helper function to use with array_walk. Modifies a by-ref
    1152. 

  1152.  * value and makes it lowercase.
    1153. 

  1153.  *
    1154. 

  1154.  * @param  $val a value passed by-ref.
    1155. 

  1155.  * @return      void since it modifies a by-ref value.
    1156. 

  1156.  */
    1157. 

  1157. function sq_casenormalize(&$val){
    1158. 

  1158.     $val = strtolower($val);
    1159. 

  1159. }
    1160. 

  1160. 

  1161. /**
    1162. 

  1162.  * This function skips any whitespace from the current position within
    1163. 

  1163.  * a string and to the next non-whitespace value.
    1164. 

  1164.  *
    1165. 

  1165.  * @param  $body   the string
    1166. 

  1166.  * @param  $offset the offset within the string where we should start
    1167. 

  1167.  *                 looking for the next non-whitespace character.
    1168. 

  1168.  * @return         the location within the $body where the next
    1169. 

  1169.  *                 non-whitespace char is located.
    1170. 

  1170.  */
    1171. 

  1171. function sq_skipspace($body, $offset){
    1172. 

  1172.     $me = 'sq_skipspace';
    1173. 

  1173.     preg_match('/^(\s*)/s', substr($body, $offset), $matches);
    1174. 

  1174.     if (sizeof($matches{1})){
    1175. 

  1175.         $count = strlen($matches{1});
    1176. 

  1176.         $offset += $count;
    1177. 

  1177.     }
    1178. 

  1178.     return $offset;
    1179. 

  1179. }
    1180. 

  1180. 

  1181. /**
    1182. 

  1182.  * This function looks for the next character within a string.  It's
    1183. 

  1183.  * really just a glorified "strpos", except it catches if failures
    1184. 

  1184.  * nicely.
    1185. 

  1185.  *
    1186. 

  1186.  * @param  $body   The string to look for needle in.
    1187. 

  1187.  * @param  $offset Start looking from this position.
    1188. 

  1188.  * @param  $needle The character/string to look for.
    1189. 

  1189.  * @return         location of the next occurance of the needle, or
    1190. 

  1190.  *                 strlen($body) if needle wasn't found.
    1191. 

  1191.  */
    1192. 

  1192. function sq_findnxstr($body, $offset, $needle){
    1193. 

  1193.     $me  = 'sq_findnxstr';
    1194. 

  1194.     $pos = strpos($body, $needle, $offset);
    1195. 

  1195.     if ($pos === FALSE){
    1196. 

  1196.         $pos = strlen($body);
    1197. 

  1197.     }
    1198. 

  1198.     return $pos;
    1199. 

  1199. }
    1200. 

  1200. 

  1201. /**
    1202. 

  1202.  * This function takes a PCRE-style regexp and tries to match it
    1203. 

  1203.  * within the string.
    1204. 

  1204.  *
    1205. 

  1205.  * @param  $body   The string to look for needle in.
    1206. 

  1206.  * @param  $offset Start looking from here.
    1207. 

  1207.  * @param  $reg    A PCRE-style regex to match.
    1208. 

  1208.  * @return         Returns a false if no matches found, or an array
    1209. 

  1209.  *                 with the following members:
    1210. 

  1210.  *                 - integer with the location of the match within $body
    1211. 

  1211.  *                 - string with whatever content between offset and the match
    1212. 

  1212.  *                 - string with whatever it is we matched
    1213. 

  1213.  */
    1214. 

  1214. function sq_findnxreg($body, $offset, $reg){
    1215. 

  1215.     $me = 'sq_findnxreg';
    1216. 

  1216.     $matches = Array();
    1217. 

  1217.     $retarr = Array();
    1218. 

  1218.     preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
    1219. 

  1219.     if (!isset($matches{0}) || !$matches{0}){
    1220. 

  1220.         $retarr = false;
    1221. 

  1221.     } else {
    1222. 

  1222.         $retarr{0} = $offset + strlen($matches{1});
    1223. 

  1223.         $retarr{1} = $matches{1};
    1224. 

  1224.         $retarr{2} = $matches{2};
    1225. 

  1225.     }
    1226. 

  1226.     return $retarr;
    1227. 

  1227. }
    1228. 

  1228. 

  1229. /**
    1230. 

  1230.  * This function looks for the next tag.
    1231. 

  1231.  *
    1232. 

  1232.  * @param  $body   String where to look for the next tag.
    1233. 

  1233.  * @param  $offset Start looking from here.
    1234. 

  1234.  * @return         false if no more tags exist in the body, or
    1235. 

  1235.  *                 an array with the following members:
    1236. 

  1236.  *                 - string with the name of the tag
    1237. 

  1237.  *                 - array with attributes and their values
    1238. 

  1238.  *                 - integer with tag type (1, 2, or 3)
    1239. 

  1239.  *                 - integer where the tag starts (starting "<")
    1240. 

  1240.  *                 - integer where the tag ends (ending ">")
    1241. 

  1241.  *                 first three members will be false, if the tag is invalid.
    1242. 

  1242.  */
    1243. 

  1243. function sq_getnxtag($body, $offset){
    1244. 

  1244.     $me = 'sq_getnxtag';
    1245. 

  1245.     if ($offset > strlen($body)){
    1246. 

  1246.         return false;
    1247. 

  1247.     }
    1248. 

  1248.     $lt = sq_findnxstr($body, $offset, "<");
    1249. 

  1249.     if ($lt == strlen($body)){
    1250. 

  1250.         return false;
    1251. 

  1251.     }
    1252. 

  1252.     /**
    1253. 

  1253.      * We are here:
    1254. 

  1254.      * blah blah <tag attribute="value">
    1255. 

  1255.      * \---------^
    1256. 

  1256.      */
    1257. 

  1257.     $pos = sq_skipspace($body, $lt+1);
    1258. 

  1258.     if ($pos >= strlen($body)){
    1259. 

  1259.         return Array(false, false, false, $lt, strlen($body));
    1260. 

  1260.     }
    1261. 

  1261.     /**
    1262. 

  1262.      * There are 3 kinds of tags:
    1263. 

  1263.      * 1. Opening tag, e.g.:
    1264. 

  1264.      *    <a href="blah">
    1265. 

  1265.      * 2. Closing tag, e.g.:
    1266. 

  1266.      *    </a>
    1267. 

  1267.      * 3. XHTML-style content-less tag, e.g.:
    1268. 

  1268.      *    <img src="blah" />
    1269. 

  1269.      */
    1270. 

  1270.     $tagtype = false;
    1271. 

  1271.     switch (substr($body, $pos, 1)){
    1272. 

  1272.         case '/':
    1273. 

  1273.             $tagtype = 2;
    1274. 

  1274.             $pos++;
    1275. 

  1275.             break;
    1276. 

  1276.         case '!':
    1277. 

  1277.             /**
    1278. 

  1278.              * A comment or an SGML declaration.
    1279. 

  1279.              */
    1280. 

  1280.             if (substr($body, $pos+1, 2) == "--"){
    1281. 

  1281.                 $gt = strpos($body, "-->", $pos);
    1282. 

  1282.                 if ($gt === false){
    1283. 

  1283.                     $gt = strlen($body);
    1284. 

  1284.                 } else {
    1285. 

  1285.                     $gt += 2;
    1286. 

  1286.                 }
    1287. 

  1287.                 return Array(false, false, false, $lt, $gt);
    1288. 

  1288.             } else {
    1289. 

  1289.                 $gt = sq_findnxstr($body, $pos, ">");
    1290. 

  1290.                 return Array(false, false, false, $lt, $gt);
    1291. 

  1291.             }
    1292. 

  1292.             break;
    1293. 

  1293.         default:
    1294. 

  1294.             /**
    1295. 

  1295.              * Assume tagtype 1 for now. If it's type 3, we'll switch values
    1296. 

  1296.              * later.
    1297. 

  1297.              */
    1298. 

  1298.             $tagtype = 1;
    1299. 

  1299.             break;
    1300. 

  1300.     }
    1301. 

  1301. 

  1302.     $tag_start = $pos;
    1303. 

  1303.     $tagname = '';
    1304. 

  1304.     /**
    1305. 

  1305.      * Look for next [\W-_], which will indicate the end of the tag name.
    1306. 

  1306.      */
    1307. 

  1307.     $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
    1308. 

  1308.     if ($regary == false){
    1309. 

  1309.         return Array(false, false, false, $lt, strlen($body));
    1310. 

  1310.     }
    1311. 

  1311.     list($pos, $tagname, $match) = $regary;
    1312. 

  1312.     $tagname = strtolower($tagname);
    1313. 

  1313. 

  1314.     /**
    1315. 

  1315.      * $match can be either of these:
    1316. 

  1316.      * '>'  indicating the end of the tag entirely.
    1317. 

  1317.      * '\s' indicating the end of the tag name.
    1318. 

  1318.      * '/'  indicating that this is type-3 xhtml tag.
    1319. 

  1319.      *
    1320. 

  1320.      * Whatever else we find there indicates an invalid tag.
    1321. 

  1321.      */
    1322. 

  1322.     switch ($match){
    1323. 

  1323.         case '/':
    1324. 

  1324.             /**
    1325. 

  1325.              * This is an xhtml-style tag with a closing / at the
    1326. 

  1326.              * end, like so: <img src="blah" />. Check if it's followed
    1327. 

  1327.              * by the closing bracket. If not, then this tag is invalid
    1328. 

  1328.              */
    1329. 

  1329.             if (substr($body, $pos, 2) == "/>"){
    1330. 

  1330.                 $pos++;
    1331. 

  1331.                 $tagtype = 3;
    1332. 

  1332.             } else {
    1333. 

  1333.                 $gt = sq_findnxstr($body, $pos, ">");
    1334. 

  1334.                 $retary = Array(false, false, false, $lt, $gt);
    1335. 

  1335.                 return $retary;
    1336. 

  1336.             }
    1337. 

  1337.         case '>':
    1338. 

  1338.             return Array($tagname, false, $tagtype, $lt, $pos);
    1339. 

  1339.             break;
    1340. 

  1340.         default:
    1341. 

  1341.             /**
    1342. 

  1342.              * Check if it's whitespace
    1343. 

  1343.              */
    1344. 

  1344.             if (!preg_match('/\s/', $match)){
    1345. 

  1345.                 /**
    1346. 

  1346.                  * This is an invalid tag! Look for the next closing ">".
    1347. 

  1347.                  */
    1348. 

  1348.                 $gt = sq_findnxstr($body, $lt, ">");
    1349. 

  1349.                 return Array(false, false, false, $lt, $gt);
    1350. 

  1350.             }
    1351. 

  1351.             break;
    1352. 

  1352.     }
    1353. 

  1353. 

  1354.     /**
    1355. 

  1355.      * At this point we're here:
    1356. 

  1356.      * <tagname  attribute='blah'>
    1357. 

  1357.      * \-------^
    1358. 

  1358.      *
    1359. 

  1359.      * At this point we loop in order to find all attributes.
    1360. 

  1360.      */
    1361. 

  1361.     $attname = '';
    1362. 

  1362.     $atttype = false;
    1363. 

  1363.     $attary = Array();
    1364. 

  1364. 

  1365.     while ($pos <= strlen($body)){
    1366. 

  1366.         $pos = sq_skipspace($body, $pos);
    1367. 

  1367.         if ($pos == strlen($body)){
    1368. 

  1368.             /**
    1369. 

  1369.              * Non-closed tag.
    1370. 

  1370.              */
    1371. 

  1371.             return Array(false, false, false, $lt, $pos);
    1372. 

  1372.         }
    1373. 

  1373.         /**
    1374. 

  1374.          * See if we arrived at a ">" or "/>", which means that we reached
    1375. 

  1375.          * the end of the tag.
    1376. 

  1376.          */
    1377. 

  1377.         $matches = Array();
    1378. 

  1378.         if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
    1379. 

  1379.             /**
    1380. 

  1380.              * Yep. So we did.
    1381. 

  1381.              */
    1382. 

  1382.             $pos += strlen($matches{1});
    1383. 

  1383.             if ($matches{2} == "/>"){
    1384. 

  1384.                 $tagtype = 3;
    1385. 

  1385.                 $pos++;
    1386. 

  1386.             }
    1387. 

  1387.             return Array($tagname, $attary, $tagtype, $lt, $pos);
    1388. 

  1388.         }
    1389. 

  1389. 

  1390.         /**
    1391. 

  1391.          * There are several types of attributes, with optional
    1392. 

  1392.          * [:space:] between members.
    1393. 

  1393.          * Type 1:
    1394. 

  1394.          *   attrname[:space:]=[:space:]'CDATA'
    1395. 

  1395.          * Type 2:
    1396. 

  1396.          *   attrname[:space:]=[:space:]"CDATA"
    1397. 

  1397.          * Type 3:
    1398. 

  1398.          *   attr[:space:]=[:space:]CDATA
    1399. 

  1399.          * Type 4:
    1400. 

  1400.          *   attrname
    1401. 

  1401.          *
    1402. 

  1402.          * We leave types 1 and 2 the same, type 3 we check for
    1403. 

  1403.          * '"' and convert to "&quot" if needed, then wrap in
    1404. 

  1404.          * double quotes. Type 4 we convert into:
    1405. 

  1405.          * attrname="yes".
    1406. 

  1406.          */
    1407. 

  1407.         $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
    1408. 

  1408.         if ($regary == false){
    1409. 

  1409.             /**
    1410. 

  1410.              * Looks like body ended before the end of tag.
    1411. 

  1411.              */
    1412. 

  1412.             return Array(false, false, false, $lt, strlen($body));
    1413. 

  1413.         }
    1414. 

  1414.         list($pos, $attname, $match) = $regary;
    1415. 

  1415.         $attname = strtolower($attname);
    1416. 

  1416.         /**
    1417. 

  1417.          * We arrived at the end of attribute name. Several things possible
    1418. 

  1418.          * here:
    1419. 

  1419.          * '>'  means the end of the tag and this is attribute type 4
    1420. 

  1420.          * '/'  if followed by '>' means the same thing as above
    1421. 

  1421.          * '\s' means a lot of things -- look what it's followed by.
    1422. 

  1422.          *      anything else means the attribute is invalid.
    1423. 

  1423.          */
    1424. 

  1424.         switch($match){
    1425. 

  1425.             case '/':
    1426. 

  1426.                 /**
    1427. 

  1427.                  * This is an xhtml-style tag with a closing / at the
    1428. 

  1428.                  * end, like so: <img src="blah" />. Check if it's followed
    1429. 

  1429.                  * by the closing bracket. If not, then this tag is invalid
    1430. 

  1430.                  */
    1431. 

  1431.                 if (substr($body, $pos, 2) == "/>"){
    1432. 

  1432.                     $pos++;
    1433. 

  1433.                     $tagtype = 3;
    1434. 

  1434.                 } else {
    1435. 

  1435.                     $gt = sq_findnxstr($body, $pos, ">");
    1436. 

  1436.                     $retary = Array(false, false, false, $lt, $gt);
    1437. 

  1437.                     return $retary;
    1438. 

  1438.                 }
    1439. 

  1439.             case '>':
    1440. 

  1440.                 $attary{$attname} = '"yes"';
    1441. 

  1441.                 return Array($tagname, $attary, $tagtype, $lt, $pos);
    1442. 

  1442.                 break;
    1443. 

  1443.             default:
    1444. 

  1444.                 /**
    1445. 

  1445.                  * Skip whitespace and see what we arrive at.
    1446. 

  1446.                  */
    1447. 

  1447.                 $pos = sq_skipspace($body, $pos);
    1448. 

  1448.                 $char = substr($body, $pos, 1);
    1449. 

  1449.                 /**
    1450. 

  1450.                  * Two things are valid here:
    1451. 

  1451.                  * '=' means this is attribute type 1 2 or 3.
    1452. 

  1452.                  * \w means this was attribute type 4.
    1453. 

  1453.                  * anything else we ignore and re-loop. End of tag and
    1454. 

  1454.                  * invalid stuff will be caught by our checks at the beginning
    1455. 

  1455.                  * of the loop.
    1456. 

  1456.                  */
    1457. 

  1457.                 if ($char == "="){
    1458. 

  1458.                     $pos++;
    1459. 

  1459.                     $pos = sq_skipspace($body, $pos);
    1460. 

  1460.                     /**
    1461. 

  1461.                      * Here are 3 possibilities:
    1462. 

  1462.                      * "'"  attribute type 1
    1463. 

  1463.                      * '"'  attribute type 2
    1464. 

  1464.                      * everything else is the content of tag type 3
    1465. 

  1465.                      */
    1466. 

  1466.                     $quot = substr($body, $pos, 1);
    1467. 

  1467.                     if ($quot == "'"){
    1468. 

  1468.                         $regary = sq_findnxreg($body, $pos+1, "\'");
    1469. 

  1469.                         if ($regary == false){
    1470. 

  1470.                             return Array(false, false, false, $lt, strlen($body));
    1471. 

  1471.                         }
    1472. 

  1472.                         list($pos, $attval, $match) = $regary;
    1473. 

  1473.                         $pos++;
    1474. 

  1474.                         $attary{$attname} = "'" . $attval . "'";
    1475. 

  1475.                     } else if ($quot == '"'){
    1476. 

  1476.                         $regary = sq_findnxreg($body, $pos+1, '\"');
    1477. 

  1477.                         if ($regary == false){
    1478. 

  1478.                             return Array(false, false, false, $lt, strlen($body));
    1479. 

  1479.                         }
    1480. 

  1480.                         list($pos, $attval, $match) = $regary;
    1481. 

  1481.                         $pos++;
    1482. 

  1482.                         $attary{$attname} = '"' . $attval . '"';
    1483. 

  1483.                     } else {
    1484. 

  1484.                         /**
    1485. 

  1485.                          * These are hateful. Look for \s, or >.
    1486. 

  1486.                          */
    1487. 

  1487.                         $regary = sq_findnxreg($body, $pos, "[\s>]");
    1488. 

  1488.                         if ($regary == false){
    1489. 

  1489.                             return Array(false, false, false, $lt, strlen($body));
    1490. 

  1490.                         }
    1491. 

  1491.                         list($pos, $attval, $match) = $regary;
    1492. 

  1492.                         /**
    1493. 

  1493.                          * If it's ">" it will be caught at the top.
    1494. 

  1494.                          */
    1495. 

  1495.                         $attval = preg_replace("/\"/s", "&quot;", $attval);
    1496. 

  1496.                         $attary{$attname} = '"' . $attval . '"';
    1497. 

  1497.                     }
    1498. 

  1498.                 } else if (preg_match("|[\w/>]|", $char)) {
    1499. 

  1499.                     /**
    1500. 

  1500.                      * That was attribute type 4.
    1501. 

  1501.                      */
    1502. 

  1502.                     $attary{$attname} = '"yes"';
    1503. 

  1503.                 } else {
    1504. 

  1504.                     /**
    1505. 

  1505.                      * An illegal character. Find next '>' and return.
    1506. 

  1506.                      */
    1507. 

  1507.                     $gt = sq_findnxstr($body, $pos, ">");
    1508. 

  1508.                     return Array(false, false, false, $lt, $gt);
    1509. 

  1509.                 }
    1510. 

  1510.                 break;
    1511. 

  1511.         }
    1512. 

  1512.     }
    1513. 

  1513.     /**
    1514. 

  1514.      * The fact that we got here indicates that the tag end was never
    1515. 

  1515.      * found. Return invalid tag indication so it gets stripped.
    1516. 

  1516.      */
    1517. 

  1517.     return Array(false, false, false, $lt, strlen($body));
    1518. 

  1518. }
    1519. 

  1519. 

  1520. /**
    1521. 

  1521.  * Translates entities into literal values so they can be checked.
    1522. 

  1522.  *
    1523. 

  1523.  * @param $attvalue the by-ref value to check.
    1524. 

  1524.  * @param $regex    the regular expression to check against.
    1525. 

  1525.  * @param $hex      whether the entites are hexadecimal.
    1526. 

  1526.  * @return          True or False depending on whether there were matches.
    1527. 

  1527.  */
    1528. 

  1528. function sq_deent(&$attvalue, $regex, $hex=false){
    1529. 

  1529.     $me = 'sq_deent';
    1530. 

  1530.     $ret_match = false;
    1531. 

  1531.     preg_match_all($regex, $attvalue, $matches);
    1532. 

  1532.     if (is_array($matches) && sizeof($matches[0]) > 0){
    1533. 

  1533.         $repl = Array();
    1534. 

  1534.         for ($i = 0; $i < sizeof($matches[0]); $i++){
    1535. 

  1535.             $numval = $matches[1][$i];
    1536. 

  1536.             if ($hex){
    1537. 

  1537.                 $numval = hexdec($numval);
    1538. 

  1538.             }
    1539. 

  1539.             $repl{$matches[0][$i]} = chr($numval);
    1540. 

  1540.         }
    1541. 

  1541.         $attvalue = strtr($attvalue, $repl);
    1542. 

  1542.         return true;
    1543. 

  1543.     } else {
    1544. 

  1544.         return false;
    1545. 

  1545.     }
    1546. 

  1546. }
    1547. 

  1547. 

  1548. /**
    1549. 

  1549.  * This function runs various checks against the attributes.
    1550. 

  1550.  *
    1551. 

  1551.  * @param  $tagname         String with the name of the tag.
    1552. 

  1552.  * @param  $attary          Array with all tag attributes.
    1553. 

  1553.  * @param  $rm_attnames     See description for sq_sanitize
    1554. 

  1554.  * @param  $bad_attvals     See description for sq_sanitize
    1555. 

  1555.  * @param  $add_attr_to_tag See description for sq_sanitize
    1556. 

  1556.  * @param  $message         message object
    1557. 

  1557.  * @param  $id              message id
    1558. 

  1558.  * @param  $mailbox         mailbox
    1559. 

  1559.  * @return                  Array with modified attributes.
    1560. 

  1560.  */
    1561. 

  1561. function sq_fixatts($tagname,
    1562. 

  1562.                     $attary,
    1563. 

  1563.                     $rm_attnames,
    1564. 

  1564.                     $bad_attvals,
    1565. 

  1565.                     $add_attr_to_tag,
    1566. 

  1566.                     $message,
    1567. 

  1567.                     $id,
    1568. 

  1568.                     $mailbox
    1569. 

  1569.                     ){
    1570. 

  1570.     $me = 'sq_fixatts';
    1571. 

  1571.     while (list($attname, $attvalue) = each($attary)){
    1572. 

  1572.         /**
    1573. 

  1573.          * See if this attribute should be removed.
    1574. 

  1574.          */
    1575. 

  1575.         foreach ($rm_attnames as $matchtag=>$matchattrs){
    1576. 

  1576.             if (preg_match($matchtag, $tagname)){
    1577. 

  1577.                 foreach ($matchattrs as $matchattr){
    1578. 

  1578.                     if (preg_match($matchattr, $attname)){
    1579. 

  1579.                         unset($attary{$attname});
    1580. 

  1580.                         continue;
    1581. 

  1581.                     }
    1582. 

  1582.                 }
    1583. 

  1583.             }
    1584. 

  1584.         }
    1585. 

  1585. 

  1586.         /**
    1587. 

  1587.          * Workaround for IE quirks
    1588. 

  1588.          */
    1589. 

  1589.         sq_fixIE_idiocy($attvalue);
    1590. 

  1590. 

  1591.         /**
    1592. 

  1592.          * Remove any backslashes, entities, and extraneous whitespace.
    1593. 

  1593.          */
    1594. 

  1594.         $oldattvalue = $attvalue;
    1595. 

  1595.         sq_defang($attvalue);
    1596. 

  1596.         if ($attname == 'style' && $attvalue !== $oldattvalue) {
    1597. 

  1597.             // entities are used in the attribute value. In 99% of the cases it's there as XSS
    1598. 

  1598.             // i.e.<div style="{ left:exp&#x0280;essio&#x0274;( alert('XSS') ) }">
    1599. 

  1599.             $attvalue = "idiocy";
    1600. 

  1600.             $attary{$attname} = $attvalue;
    1601. 

  1601.         }
    1602. 

  1602.         sq_unspace($attvalue);
    1603. 

  1603. 

  1604.         /**
    1605. 

  1605.          * Now let's run checks on the attvalues.
    1606. 

  1606.          * I don't expect anyone to comprehend this. If you do,
    1607. 

  1607.          * get in touch with me so I can drive to where you live and
    1608. 

  1608.          * shake your hand personally. :)
    1609. 

  1609.          */
    1610. 

  1610.         foreach ($bad_attvals as $matchtag=>$matchattrs){
    1611. 

  1611.             if (preg_match($matchtag, $tagname)){
    1612. 

  1612.                 foreach ($matchattrs as $matchattr=>$valary){
    1613. 

  1613.                     if (preg_match($matchattr, $attname)){
    1614. 

  1614.                         /**
    1615. 

  1615.                          * There are two arrays in valary.
    1616. 

  1616.                          * First is matches.
    1617. 

  1617.                          * Second one is replacements
    1618. 

  1618.                          */
    1619. 

  1619.                         list($valmatch, $valrepl) = $valary;
    1620. 

  1620.                         $newvalue =
    1621. 

  1621.                             preg_replace($valmatch, $valrepl, $attvalue);
    1622. 

  1622.                         if ($newvalue != $attvalue){
    1623. 

  1623.                             $attary{$attname} = $newvalue;
    1624. 

  1624.                             $attvalue = $newvalue;
    1625. 

  1625.                         }
    1626. 

  1626.                     }
    1627. 

  1627.                 }
    1628. 

  1628.             }
    1629. 

  1629.         }
    1630. 

  1630.         if ($attname == 'style') {
    1631. 

  1631.             if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
    1632. 

  1632.                 // 8bit and control characters in style attribute values can be used for XSS, remove them
    1633. 

  1633.                 $attary{$attname} = '"disallowed character"';
    1634. 

  1634.             }
    1635. 

  1635.             preg_match_all("/url\s*\((.+)\)/si",$attvalue,$aMatch);
    1636. 

  1636.             if (count($aMatch)) {
    1637. 

  1637.                 foreach($aMatch[1] as $sMatch) {
    1638. 

  1638.                     // url value
    1639. 

  1639.                     $urlvalue = $sMatch;
    1640. 

  1640.                     sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'");
    1641. 

  1641.                     $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue);
    1642. 

  1642.                 }
    1643. 

  1643.             }
    1644. 

  1644.         }
    1645. 

  1645.         /**
    1646. 

  1646.          * Use white list based filtering on attributes which can contain url's
    1647. 

  1647.          */
    1648. 

  1648.         else if ($attname == 'href' || $attname == 'src' || $attname == 'background') {
    1649. 

  1649.             sq_fix_url($attname, $attvalue, $message, $id, $mailbox);
    1650. 

  1650.             $attary{$attname} = $attvalue;
    1651. 

  1651.         }
    1652. 

  1652.     }
    1653. 

  1653.     /**
    1654. 

  1654.      * See if we need to append any attributes to this tag.
    1655. 

  1655.      */
    1656. 

  1656.     foreach ($add_attr_to_tag as $matchtag=>$addattary){
    1657. 

  1657.         if (preg_match($matchtag, $tagname)){
    1658. 

  1658.             $attary = array_merge($attary, $addattary);
    1659. 

  1659.         }
    1660. 

  1660.     }
    1661. 

  1661.     return $attary;
    1662. 

  1662. }
    1663. 

  1663. 

  1664. /**
    1665. 

  1665.  * This function filters url's
    1666. 

  1666.  *
    1667. 

  1667.  * @param  $attvalue        String with attribute value to filter
    1668. 

  1668.  * @param  $message         message object
    1669. 

  1669.  * @param  $id               message id
    1670. 

  1670.  * @param  $mailbox         mailbox
    1671. 

  1671.  * @param  $sQuote          quoting characters around url's
    1672. 

  1672.  */
    1673. 

  1673. function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') {
    1674. 

  1674.     $attvalue = trim($attvalue);
    1675. 

  1675.     if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
    1676. 

  1676.         // remove the double quotes
    1677. 

  1677.         $sQuote = $attvalue[0];
    1678. 

  1678.         $attvalue = trim(substr($attvalue,1,-1));
    1679. 

  1679.     }
    1680. 

  1680. 

  1681.     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
    1682. 

  1682.         $view_unsafe_images = false;
    1683. 

  1683.     }
    1684. 

  1684.     $secremoveimg = '../images/' . _("sec_remove_eng.png");
    1685. 

  1685. 

  1686.     /**
    1687. 

  1687.      * Replace empty src tags with the blank image.  src is only used
    1688. 

  1688.      * for frames, images, and image inputs.  Doing a replace should
    1689. 

  1689.      * not affect them working as should be, however it will stop
    1690. 

  1690.      * IE from being kicked off when src for img tags are not set
    1691. 

  1691.      */
    1692. 

  1692.     if ($attvalue == '') {
    1693. 

  1693.         $attvalue = '"' . SM_PATH . 'images/blank.png"';
    1694. 

  1694.     } else {
    1695. 

  1695.         // first, disallow 8 bit characters and control characters
    1696. 

  1696.         if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
    1697. 

  1697.             switch ($attname) {
    1698. 

  1698.                 case 'href':
    1699. 

  1699.                     $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
    1700. 

  1700.                     break;
    1701. 

  1701.                 default:
    1702. 

  1702.                     $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
    1703. 

  1703.                     break;
    1704. 

  1704.             }
    1705. 

  1705.         } else {
    1706. 

  1706.             $aUrl = parse_url($attvalue);
    1707. 

  1707.             if (isset($aUrl['scheme'])) {
    1708. 

  1708.                 switch(strtolower($aUrl['scheme'])) {
    1709. 

  1709.                     case 'mailto':
    1710. 

  1710.                     case 'http':
    1711. 

  1711.                     case 'https':
    1712. 

  1712.                     case 'ftp':
    1713. 

  1713.                         if ($attname != 'href') {
    1714. 

  1714.                             if ($view_unsafe_images == false) {
    1715. 

  1715.                                 $attvalue = $sQuote . $secremoveimg . $sQuote;
    1716. 

  1716.                             } else {
    1717. 

  1717.                                 if (isset($aUrl['path'])) {
    1718. 

  1718.                                     // validate image extension.
    1719. 

  1719.                                     $ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
    1720. 

  1720.                                     if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
    1721. 

  1721.                                         $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
    1722. 

  1722.                                     }
    1723. 

  1723.                                 } else {
    1724. 

  1724.                                     $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
    1725. 

  1725.                                 }
    1726. 

  1726.                             }
    1727. 

  1727.                         }
    1728. 

  1728.                         break;
    1729. 

  1729.                     case 'outbind':
    1730. 

  1730.                         /**
    1731. 

  1731.                          * "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
    1732. 

  1732.                          * One day MS might actually make it match something useful, for now, falling
    1733. 

  1733.                          * back to using cid2http, so we can grab the blank.png.
    1734. 

  1734.                          */
    1735. 

  1735.                         $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
    1736. 

  1736.                         break;
    1737. 

  1737.                     case 'cid':
    1738. 

  1738.                         /**
    1739. 

  1739.                             * Turn cid: urls into http-friendly ones.
    1740. 

  1740.                             */
    1741. 

  1741.                         $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
    1742. 

  1742.                         break;
    1743. 

  1743.                     default:
    1744. 

  1744.                         $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
    1745. 

  1745.                         break;
    1746. 

  1746.                 }
    1747. 

  1747.             } else {
    1748. 

  1748.                 if (!(isset($aUrl['path']) && $aUrl['path'] == $secremoveimg)) {
    1749. 

  1749.                     // parse_url did not lead to satisfying result
    1750. 

  1750.                     $attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
    1751. 

  1751.                 }
    1752. 

  1752.             }
    1753. 

  1753.         }
    1754. 

  1754.     }
    1755. 

  1755. }
    1756. 

  1756. 

  1757. /**
    1758. 

  1758.  * This function edits the style definition to make them friendly and
    1759. 

  1759.  * usable in SquirrelMail.
    1760. 

  1760.  *
    1761. 

  1761.  * @param  $message  the message object
    1762. 

  1762.  * @param  $id       the message id
    1763. 

  1763.  * @param  $content  a string with whatever is between <style> and </style>
    1764. 

  1764.  * @param  $mailbox  the message mailbox
    1765. 

  1765.  * @return           a string with edited content.
    1766. 

  1766.  */
    1767. 

  1767. function sq_fixstyle($body, $pos, $message, $id, $mailbox){
    1768. 

  1768.     global $view_unsafe_images;
    1769. 

  1769.     $me = 'sq_fixstyle';
    1770. 

  1770. 

  1771.     // workaround for </style> in between comments
    1772. 

  1772.     $iCurrentPos = $pos;
    1773. 

  1773.     $content = '';
    1774. 

  1774.     $sToken = '';
    1775. 

  1775.     $bSucces = false;
    1776. 

  1776.     $bEndTag = false;
    1777. 

  1777.     for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
    1778. 

  1778.         $char = $body{$i};
    1779. 

  1779.         switch ($char) {
    1780. 

  1780.             case '<':
    1781. 

  1781.                 $sToken .= $char;
    1782. 

  1782.                 break;
    1783. 

  1783.             case '/':
    1784. 

  1784.                  if ($sToken == '<') {
    1785. 

  1785.                     $sToken .= $char;
    1786. 

  1786.                     $bEndTag = true;
    1787. 

  1787.                  } else {
    1788. 

  1788.                     $content .= $char;
    1789. 

  1789.                  }
    1790. 

  1790.                  break;
    1791. 

  1791.             case '>':
    1792. 

  1792.                  if ($bEndTag) {
    1793. 

  1793.                     $sToken .= $char;
    1794. 

  1794.                     if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
    1795. 

  1795.                         $newpos = $i + 1;
    1796. 

  1796.                         $bSucces = true;
    1797. 

  1797.                         break 2;
    1798. 

  1798.                     } else {
    1799. 

  1799.                         $content .= $sToken;
    1800. 

  1800.                     }
    1801. 

  1801.                     $bEndTag = false;
    1802. 

  1802.                  } else {
    1803. 

  1803.                     $content .= $char;
    1804. 

  1804.                  }
    1805. 

  1805.                  break;
    1806. 

  1806.             case '!':
    1807. 

  1807.                 if ($sToken == '<') {
    1808. 

  1808.                     // possible comment
    1809. 

  1809.                     if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
    1810. 

  1810.                         $i = strpos($body,'-->',$i+3);
    1811. 

  1811.                         if ($i === false) { // no end comment
    1812. 

  1812.                             $i = strlen($body);
    1813. 

  1813.                         }
    1814. 

  1814.                         $sToken = '';
    1815. 

  1815.                     }
    1816. 

  1816.                 } else {
    1817. 

  1817.                     $content .= $char;
    1818. 

  1818.                 }
    1819. 

  1819.                 break;
    1820. 

  1820.             default:
    1821. 

  1821.                 if ($bEndTag) {
    1822. 

  1822.                     $sToken .= $char;
    1823. 

  1823.                 } else {
    1824. 

  1824.                     $content .= $char;
    1825. 

  1825.                 }
    1826. 

  1826.                 break;
    1827. 

  1827.         }
    1828. 

  1828.     }
    1829. 

  1829.     if ($bSucces == FALSE){
    1830. 

  1830.         return array(FALSE, strlen($body));
    1831. 

  1831.     }
    1832. 

  1832. 

  1833.     /**
    1834. 

  1834.      * First look for general BODY style declaration, which would be
    1835. 

  1835.      * like so:
    1836. 

  1836.      * body {background: blah-blah}
    1837. 

  1837.      * and change it to .bodyclass so we can just assign it to a <div>
    1838. 

  1838.      */
    1839. 

  1839.     $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
    1840. 

  1840.     $secremoveimg = '../images/' . _("sec_remove_eng.png");
    1841. 

  1841. 

  1842.     // first check for 8bit sequences and disallowed control characters
    1843. 

  1843.     if (preg_match('/[\16-\37\200-\377]+/',$content)) {
    1844. 

  1844.         $content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
    1845. 

  1845.         return array($content, $newpos);
    1846. 

  1846.     }
    1847. 

  1847. 

  1848.     // IE Sucks hard. We have a special function for it.
    1849. 

  1849.     sq_fixIE_idiocy($content);
    1850. 

  1850. 

  1851.     // remove @import line
    1852. 

  1852.     $content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
    1853. 

  1853. 

  1854.     /**
    1855. 

  1855.      * Fix url('blah') declarations.
    1856. 

  1856.      */
    1857. 

  1857.     // translate ur\l and variations into url (IE parses that)
    1858. 

  1858.     // TODO check if the sq_fixIE_idiocy function already handles this.
    1859. 

  1859.     $content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",'url', $content);
    1860. 

  1860.     preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
    1861. 

  1861.     if (count($aMatch)) {
    1862. 

  1862.         $aValue = $aReplace = array();
    1863. 

  1863.         foreach($aMatch[1] as $sMatch) {
    1864. 

  1864.             // url value
    1865. 

  1865.             $urlvalue = $sMatch;
    1866. 

  1866.             sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
    1867. 

  1867.             $aValue[] = $sMatch;
    1868. 

  1868.             $aReplace[] = $urlvalue;
    1869. 

  1869.         }
    1870. 

  1870.         $content = str_replace($aValue,$aReplace,$content);
    1871. 

  1871.     }
    1872. 

  1872. 

  1873.     /**
    1874. 

  1874.      * Remove any backslashes, entities, and extraneous whitespace.
    1875. 

  1875.      */
    1876. 

  1876.      $contentTemp = $content;
    1877. 

  1877.      sq_defang($contentTemp);
    1878. 

  1878.      sq_unspace($contentTemp);
    1879. 

  1879. 

  1880.     /**
    1881. 

  1881.      * Fix stupid css declarations which lead to vulnerabilities
    1882. 

  1882.      * in IE.
    1883. 

  1883.      */
    1884. 

  1884.     $match   = Array('/\/\*.*\*\//',
    1885. 

  1885.                     '/expression/i',
    1886. 

  1886.                     '/behaviou*r/i',
    1887. 

  1887.                     '/binding/i',
    1888. 

  1888.                     '/include-source/i',
    1889. 

  1889.                     '/javascript/i',
    1890. 

  1890.                     '/script/i');
    1891. 

  1891.     $replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy');
    1892. 

  1892.     $contentNew = preg_replace($match, $replace, $contentTemp);
    1893. 

  1893.     if ($contentNew !== $contentTemp) {
    1894. 

  1894.         // insecure css declarations are used. From now on we don't care
    1895. 

  1895.         // anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
    1896. 

  1896.         $content = $contentNew;
    1897. 

  1897.     }
    1898. 

  1898.     return array($content, $newpos);
    1899. 

  1899. }
    1900. 

  1900. 

  1901. 

  1902. /**
    1903. 

  1903.  * This function converts cid: url's into the ones that can be viewed in
    1904. 

  1904.  * the browser.
    1905. 

  1905.  *
    1906. 

  1906.  * @param  $message  the message object
    1907. 

  1907.  * @param  $id       the message id
    1908. 

  1908.  * @param  $cidurl   the cid: url.
    1909. 

  1909.  * @param  $mailbox  the message mailbox
    1910. 

  1910.  * @return           a string with a http-friendly url
    1911. 

  1911.  */
    1912. 

  1912. function sq_cid2http($message, $id, $cidurl, $mailbox){
    1913. 

  1913.     /**
    1914. 

  1914.      * Get rid of quotes.
    1915. 

  1915.      */
    1916. 

  1916.     $quotchar = substr($cidurl, 0, 1);
    1917. 

  1917.     if ($quotchar == '"' || $quotchar == "'"){
    1918. 

  1918.         $cidurl = str_replace($quotchar, "", $cidurl);
    1919. 

  1919.     } else {
    1920. 

  1920.         $quotchar = '';
    1921. 

  1921.     }
    1922. 

  1922.     $cidurl = substr(trim($cidurl), 4);
    1923. 

  1923. 

  1924.     $match_str = '/\{.*?\}\//';
    1925. 

  1925.     $str_rep = '';
    1926. 

  1926.     $cidurl = preg_replace($match_str, $str_rep, $cidurl);
    1927. 

  1927. 

  1928.     $linkurl = find_ent_id($cidurl, $message);
    1929. 

  1929.     /* in case of non-safe cid links $httpurl should be replaced by a sort of
    1930. 

  1930.        unsafe link image */
    1931. 

  1931.     $httpurl = '';
    1932. 

  1932. 

  1933.     /**
    1934. 

  1934.      * This is part of a fix for Outlook Express 6.x generating
    1935. 

  1935.      * cid URLs without creating content-id headers. These images are
    1936. 

  1936.      * not part of the multipart/related html mail. The html contains
    1937. 

  1937.      * <img src="cid:{some_id}/image_filename.ext"> references to
    1938. 

  1938.      * attached images with as goal to render them inline although
    1939. 

  1939.      * the attachment disposition property is not inline.
    1940. 

  1940.      */
    1941. 

  1941. 

  1942.     if (empty($linkurl)) {
    1943. 

  1943.         if (preg_match('/{.*}\//', $cidurl)) {
    1944. 

  1944.             $cidurl = preg_replace('/{.*}\//','', $cidurl);
    1945. 

  1945.             if (!empty($cidurl)) {
    1946. 

  1946.                 $linkurl = find_ent_id($cidurl, $message);
    1947. 

  1947.             }
    1948. 

  1948.         }
    1949. 

  1949.     }
    1950. 

  1950. 

  1951.     if (!empty($linkurl)) {
    1952. 

  1952.         $httpurl = $quotchar . SM_PATH . 'src/download.php?absolute_dl=true&amp;' .
    1953. 

  1953.             "passed_id=$id&amp;mailbox=" . urlencode($mailbox) .
    1954. 

  1954.             '&amp;ent_id=' . $linkurl . $quotchar;
    1955. 

  1955.     } else {
    1956. 

  1956.         /**
    1957. 

  1957.          * If we couldn't generate a proper img url, drop in a blank image
    1958. 

  1958.          * instead of sending back empty, otherwise it causes unusual behaviour
    1959. 

  1959.          */
    1960. 

  1960.         $httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
    1961. 

  1961.     }
    1962. 

  1962. 

  1963.     return $httpurl;
    1964. 

  1964. }
    1965. 

  1965. 

  1966. /**
    1967. 

  1967.  * This function changes the <body> tag into a <div> tag since we
    1968. 

  1968.  * can't really have a body-within-body.
    1969. 

  1969.  *
    1970. 

  1970.  * @param  $attary   an array of attributes and values of <body>
    1971. 

  1971.  * @param  $mailbox  mailbox we're currently reading (for cid2http)
    1972. 

  1972.  * @param  $message  current message (for cid2http)
    1973. 

  1973.  * @param  $id       current message id (for cid2http)
    1974. 

  1974.  * @return           a modified array of attributes to be set for <div>
    1975. 

  1975.  */
    1976. 

  1976. function sq_body2div($attary, $mailbox, $message, $id){
    1977. 

  1977.     $me = 'sq_body2div';
    1978. 

  1978.     $divattary = Array('class' => "'bodyclass'");
    1979. 

  1979.     $bgcolor = '#ffffff';
    1980. 

  1980.     $text = '#000000';
    1981. 

  1981.     $styledef = '';
    1982. 

  1982.     if (is_array($attary) && sizeof($attary) > 0){
    1983. 

  1983.         foreach ($attary as $attname=>$attvalue){
    1984. 

  1984.             $quotchar = substr($attvalue, 0, 1);
    1985. 

  1985.             $attvalue = str_replace($quotchar, "", $attvalue);
    1986. 

  1986.             switch ($attname){
    1987. 

  1987.                 case 'background':
    1988. 

  1988.                     $attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
    1989. 

  1989.                     $styledef .= "background-image: url('$attvalue'); ";
    1990. 

  1990.                     break;
    1991. 

  1991.                 case 'bgcolor':
    1992. 

  1992.                     $styledef .= "background-color: $attvalue; ";
    1993. 

  1993.                     break;
    1994. 

  1994.                 case 'text':
    1995. 

  1995.                     $styledef .= "color: $attvalue; ";
    1996. 

  1996.                     break;
    1997. 

  1997.             }
    1998. 

  1998.         }
    1999. 

  1999.         if (strlen($styledef) > 0){
    2000. 

  2000.             $divattary{"style"} = "\"$styledef\"";
    2001. 

  2001.         }
    2002. 

  2002.     }
    2003. 

  2003.     return $divattary;
    2004. 

  2004. }
    2005. 

  2005. 

  2006. /**
    2007. 

  2007.  * This is the main function and the one you should actually be calling.
    2008. 

  2008.  * There are several variables you should be aware of an which need
    2009. 

  2009.  * special description.
    2010. 

  2010.  *
    2011. 

  2011.  * Since the description is quite lengthy, see it here:
    2012. 

  2012.  * http://linux.duke.edu/projects/mini/htmlfilter/
    2013. 

  2013.  *
    2014. 

  2014.  * @param $body                 the string with HTML you wish to filter
    2015. 

  2015.  * @param $tag_list             see description above
    2016. 

  2016.  * @param $rm_tags_with_content see description above
    2017. 

  2017.  * @param $self_closing_tags    see description above
    2018. 

  2018.  * @param $force_tag_closing    see description above
    2019. 

  2019.  * @param $rm_attnames          see description above
    2020. 

  2020.  * @param $bad_attvals          see description above
    2021. 

  2021.  * @param $add_attr_to_tag      see description above
    2022. 

  2022.  * @param $message              message object
    2023. 

  2023.  * @param $id                   message id
    2024. 

  2024.  * @return                      sanitized html safe to show on your pages.
    2025. 

  2025.  */
    2026. 

  2026. function sq_sanitize($body,
    2027. 

  2027.                      $tag_list,
    2028. 

  2028.                      $rm_tags_with_content,
    2029. 

  2029.                      $self_closing_tags,
    2030. 

  2030.                      $force_tag_closing,
    2031. 

  2031.                      $rm_attnames,
    2032. 

  2032.                      $bad_attvals,
    2033. 

  2033.                      $add_attr_to_tag,
    2034. 

  2034.                      $message,
    2035. 

  2035.                      $id,
    2036. 

  2036.                      $mailbox
    2037. 

  2037.                      ){
    2038. 

  2038.     $me = 'sq_sanitize';
    2039. 

  2039.     $rm_tags = array_shift($tag_list);
    2040. 

  2040.     /**
    2041. 

  2041.      * Normalize rm_tags and rm_tags_with_content.
    2042. 

  2042.      */
    2043. 

  2043.     @array_walk($tag_list, 'sq_casenormalize');
    2044. 

  2044.     @array_walk($rm_tags_with_content, 'sq_casenormalize');
    2045. 

  2045.     @array_walk($self_closing_tags, 'sq_casenormalize');
    2046. 

  2046.     /**
    2047. 

  2047.      * See if tag_list is of tags to remove or tags to allow.
    2048. 

  2048.      * false  means remove these tags
    2049. 

  2049.      * true   means allow these tags
    2050. 

  2050.      */
    2051. 

  2051.     $curpos = 0;
    2052. 

  2052.     $open_tags = Array();
    2053. 

  2053.     $trusted = "\n<!-- begin sanitized html -->\n";
    2054. 

  2054.     $skip_content = false;
    2055. 

  2055.     /**
    2056. 

  2056.      * Take care of netscape's stupid javascript entities like
    2057. 

  2057.      * &{alert('boo')};
    2058. 

  2058.      */
    2059. 

  2059.     $body = preg_replace("/&(\{.*?\};)/si", "&amp;\\1", $body);
    2060. 

  2060. 

  2061.     while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
    2062. 

  2062.         list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
    2063. 

  2063.         $free_content = substr($body, $curpos, $lt-$curpos);
    2064. 

  2064.         /**
    2065. 

  2065.          * Take care of <style>
    2066. 

  2066.          */
    2067. 

  2067.         if ($tagname == "style" && $tagtype == 1){
    2068. 

  2068.             list($free_content, $curpos) =
    2069. 

  2069.                 sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
    2070. 

  2070.             if ($free_content != FALSE){
    2071. 

  2071.                 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
    2072. 

  2072.                 $trusted .= $free_content;
    2073. 

  2073.                 $trusted .= sq_tagprint($tagname, false, 2);
    2074. 

  2074.             }
    2075. 

  2075.             continue;
    2076. 

  2076.         }
    2077. 

  2077.         if ($skip_content == false){
    2078. 

  2078.             $trusted .= $free_content;
    2079. 

  2079.         }
    2080. 

  2080.         if ($tagname != FALSE){
    2081. 

  2081.             if ($tagtype == 2){
    2082. 

  2082.                 if ($skip_content == $tagname){
    2083. 

  2083.                     /**
    2084. 

  2084.                      * Got to the end of tag we needed to remove.
    2085. 

  2085.                      */
    2086. 

  2086.                     $tagname = false;
    2087. 

  2087.                     $skip_content = false;
    2088. 

  2088.                 } else {
    2089. 

  2089.                     if ($skip_content == false){
    2090. 

  2090.                         if ($tagname == "body"){
    2091. 

  2091.                             $tagname = "div";
    2092. 

  2092.                         }
    2093. 

  2093.                         if (isset($open_tags{$tagname}) &&
    2094. 

  2094.                                 $open_tags{$tagname} > 0){
    2095. 

  2095.                             $open_tags{$tagname}--;
    2096. 

  2096.                         } else {
    2097. 

  2097.                             $tagname = false;
    2098. 

  2098.                         }
    2099. 

  2099.                     }
    2100. 

  2100.                 }
    2101. 

  2101.             } else {
    2102. 

  2102.                 /**
    2103. 

  2103.                  * $rm_tags_with_content
    2104. 

  2104.                  */
    2105. 

  2105.                 if ($skip_content == false){
    2106. 

  2106.                     /**
    2107. 

  2107.                      * See if this is a self-closing type and change
    2108. 

  2108.                      * tagtype appropriately.
    2109. 

  2109.                      */
    2110. 

  2110.                     if ($tagtype == 1
    2111. 

  2111.                             && in_array($tagname, $self_closing_tags)){
    2112. 

  2112.                         $tagtype = 3;
    2113. 

  2113.                     }
    2114. 

  2114.                     /**
    2115. 

  2115.                      * See if we should skip this tag and any content
    2116. 

  2116.                      * inside it.
    2117. 

  2117.                      */
    2118. 

  2118.                     if ($tagtype == 1 &&
    2119. 

  2119.                             in_array($tagname, $rm_tags_with_content)){
    2120. 

  2120.                         $skip_content = $tagname;
    2121. 

  2121.                     } else {
    2122. 

  2122.                         if (($rm_tags == false
    2123. 

  2123.                                     && in_array($tagname, $tag_list)) ||
    2124. 

  2124.                                 ($rm_tags == true &&
    2125. 

  2125.                                  !in_array($tagname, $tag_list))){
    2126. 

  2126.                             $tagname = false;
    2127. 

  2127.                         } else {
    2128. 

  2128.                             /**
    2129. 

  2129.                              * Convert body into div.
    2130. 

  2130.                              */
    2131. 

  2131.                             if ($tagname == "body"){
    2132. 

  2132.                                 $tagname = "div";
    2133. 

  2133.                                 $attary = sq_body2div($attary, $mailbox,
    2134. 

  2134.                                         $message, $id);
    2135. 

  2135.                             }
    2136. 

  2136.                             if ($tagtype == 1){
    2137. 

  2137.                                 if (isset($open_tags{$tagname})){
    2138. 

  2138.                                     $open_tags{$tagname}++;
    2139. 

  2139.                                 } else {
    2140. 

  2140.                                     $open_tags{$tagname}=1;
    2141. 

  2141.                                 }
    2142. 

  2142.                             }
    2143. 

  2143.                             /**
    2144. 

  2144.                              * This is where we run other checks.
    2145. 

  2145.                              */
    2146. 

  2146.                             if (is_array($attary) && sizeof($attary) > 0){
    2147. 

  2147.                                 $attary = sq_fixatts($tagname,
    2148. 

  2148.                                                      $attary,
    2149. 

  2149.                                                      $rm_attnames,
    2150. 

  2150.                                                      $bad_attvals,
    2151. 

  2151.                                                      $add_attr_to_tag,
    2152. 

  2152.                                                      $message,
    2153. 

  2153.                                                      $id,
    2154. 

  2154.                                                      $mailbox
    2155. 

  2155.                                                      );
    2156. 

  2156.                             }
    2157. 

  2157.                         }
    2158. 

  2158.                     }
    2159. 

  2159.                 }
    2160. 

  2160.             }
    2161. 

  2161.             if ($tagname != false && $skip_content == false){
    2162. 

  2162.                 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
    2163. 

  2163.             }
    2164. 

  2164.         }
    2165. 

  2165.         $curpos = $gt+1;
    2166. 

  2166.     }
    2167. 

  2167.     $trusted .= substr($body, $curpos, strlen($body)-$curpos);
    2168. 

  2168.     if ($force_tag_closing == true){
    2169. 

  2169.         foreach ($open_tags as $tagname=>$opentimes){
    2170. 

  2170.             while ($opentimes > 0){
    2171. 

  2171.                 $trusted .= '</' . $tagname . '>';
    2172. 

  2172.                 $opentimes--;
    2173. 

  2173.             }
    2174. 

  2174.         }
    2175. 

  2175.         $trusted .= "\n";
    2176. 

  2176.     }
    2177. 

  2177.     $trusted .= "<!-- end sanitized html -->\n";
    2178. 

  2178.     return $trusted;
    2179. 

  2179. }
    2180. 

  2180. 

  2181. /**
    2182. 

  2182.  * This is a wrapper function to call html sanitizing routines.
    2183. 

  2183.  *
    2184. 

  2184.  * @param  $body  the body of the message
    2185. 

  2185.  * @param  $id    the id of the message
    2186. 

  2186.  * @param  boolean $take_mailto_links When TRUE, converts mailto: links
    2187. 

  2187.  *                                    into internal SM compose links
    2188. 

  2188.  *                                    (optional; default = TRUE)
    2189. 

  2189.  * @return        a string with html safe to display in the browser.
    2190. 

  2190.  */
    2191. 

  2191. function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
    2192. 

  2192. 

  2193.     // require_once(SM_PATH . 'functions/url_parser.php');  // for $MailTo_PReg_Match
    2194. 

  2194. 

  2195.     global $attachment_common_show_images, $view_unsafe_images,
    2196. 

  2196.            $has_unsafe_images;
    2197. 

  2197.     /**
    2198. 

  2198.      * Don't display attached images in HTML mode.
    2199. 

  2199.      */
    2200. 

  2200.     $attachment_common_show_images = false;
    2201. 

  2201.     $tag_list = Array(
    2202. 

  2202.             false,
    2203. 

  2203.             "object",
    2204. 

  2204.             "meta",
    2205. 

  2205.             "html",
    2206. 

  2206.             "head",
    2207. 

  2207.             "base",
    2208. 

  2208.             "link",
    2209. 

  2209.             "frame",
    2210. 

  2210.             "iframe",
    2211. 

  2211.             "plaintext",
    2212. 

  2212.             "marquee"
    2213. 

  2213.             );
    2214. 

  2214. 

  2215.     $rm_tags_with_content = Array(
    2216. 

  2216.             "script",
    2217. 

  2217.             "applet",
    2218. 

  2218.             "embed",
    2219. 

  2219.             "title",
    2220. 

  2220.             "frameset",
    2221. 

  2221.             "xmp",
    2222. 

  2222.             "xml"
    2223. 

  2223.             );
    2224. 

  2224. 

  2225.     $self_closing_tags =  Array(
    2226. 

  2226.             "img",
    2227. 

  2227.             "br",
    2228. 

  2228.             "hr",
    2229. 

  2229.             "input",
    2230. 

  2230.             "outbind"
    2231. 

  2231.             );
    2232. 

  2232. 

  2233.     $force_tag_closing = true;
    2234. 

  2234. 

  2235.     $rm_attnames = Array(
    2236. 

  2236.             "/.*/" =>
    2237. 

  2237.             Array(
    2238. 

  2238.                 "/target/i",
    2239. 

  2239.                 "/^on.*/i",
    2240. 

  2240.                 "/^dynsrc/i",
    2241. 

  2241.                 "/^data.*/i",
    2242. 

  2242.                 "/^lowsrc.*/i"
    2243. 

  2243.                 )
    2244. 

  2244.             );
    2245. 

  2245. 

  2246.     $secremoveimg = "../images/" . _("sec_remove_eng.png");
    2247. 

  2247.     $bad_attvals = Array(
    2248. 

  2248.             "/.*/" =>
    2249. 

  2249.             Array(
    2250. 

  2250.                 "/^src|background/i" =>
    2251. 

  2251.                 Array(
    2252. 

  2252.                     Array(
    2253. 

  2253.                         "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
    2254. 

  2254.                         "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
    2255. 

  2255.                         "/^([\'\"])\s*about\s*:.*([\'\"])/si"
    2256. 

  2256.                         ),
    2257. 

  2257.                     Array(
    2258. 

  2258.                         "\\1$secremoveimg\\2",
    2259. 

  2259.                         "\\1$secremoveimg\\2",
    2260. 

  2260.                         "\\1$secremoveimg\\2"
    2261. 

  2261.                         )
    2262. 

  2262.                     ),
    2263. 

  2263.                 "/^href|action/i" =>
    2264. 

  2264.                 Array(
    2265. 

  2265.                     Array(
    2266. 

  2266.                         "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
    2267. 

  2267.                         "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
    2268. 

  2268.                         "/^([\'\"])\s*about\s*:.*([\'\"])/si"
    2269. 

  2269.                         ),
    2270. 

  2270.                     Array(
    2271. 

  2271.                         "\\1#\\1",
    2272. 

  2272.                         "\\1#\\1",
    2273. 

  2273.                         "\\1#\\1"
    2274. 

  2274.                         )
    2275. 

  2275.                     ),
    2276. 

  2276.         "/^style/i" =>
    2277. 

  2277.             Array(
    2278. 

  2278.                 Array(
    2279. 

  2279.                     "/\/\*.*\*\//",
    2280. 

  2280.                     "/expression/i",
    2281. 

  2281.                     "/binding/i",
    2282. 

  2282.                     "/behaviou*r/i",
    2283. 

  2283.                     "/include-source/i",
    2284. 

  2284.                     "/position\s*:\s*absolute/i",
    2285. 

  2285.                     "/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
    2286. 

  2286.                     "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
    2287. 

  2287.                     "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
    2288. 

  2288.                     "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
    2289. 

  2289.                     "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si"
    2290. 

  2290.                     ),
    2291. 

  2291.                 Array(
    2292. 

  2292.                     "",
    2293. 

  2293.                     "idiocy",
    2294. 

  2294.                     "idiocy",
    2295. 

  2295.                     "idiocy",
    2296. 

  2296.                     "idiocy",
    2297. 

  2297.                     "idiocy",
    2298. 

  2298.                     "url",
    2299. 

  2299.                     "url(\\1#\\1)",
    2300. 

  2300.                     "url(\\1#\\1)",
    2301. 

  2301.                     "url(\\1#\\1)",
    2302. 

  2302.                     "\\1:url(\\2#\\3)"
    2303. 

  2303.                     )
    2304. 

  2304.                 )
    2305. 

  2305.             )
    2306. 

  2306.         );
    2307. 

  2307.     if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) {
    2308. 

  2308.         $view_unsafe_images = false;
    2309. 

  2309.     }
    2310. 

  2310.     if (!$view_unsafe_images){
    2311. 

  2311.         /**
    2312. 

  2312.          * Remove any references to http/https if view_unsafe_images set
    2313. 

  2313.          * to false.
    2314. 

  2314.          */
    2315. 

  2315.         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
    2316. 

  2316.                 '/^([\'\"])\s*https*:.*([\'\"])/si');
    2317. 

  2317.         array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
    2318. 

  2318.                 "\\1$secremoveimg\\1");
    2319. 

  2319.         array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
    2320. 

  2320.                 '/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
    2321. 

  2321.         array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
    2322. 

  2322.                 "url(\\1$secremoveimg\\1)");
    2323. 

  2323.     }
    2324. 

  2324. 

  2325.     $add_attr_to_tag = Array(
    2326. 

  2326.             "/^a$/i" =>
    2327. 

  2327.             Array('target'=>'"_blank"',
    2328. 

  2328.                 'title'=>'"'._("This external link will open in a new window").'"'
    2329. 

  2329.                 )
    2330. 

  2330.             );
    2331. 

  2331.     $trusted = sq_sanitize($body,
    2332. 

  2332.                            $tag_list,
    2333. 

  2333.                            $rm_tags_with_content,
    2334. 

  2334.                            $self_closing_tags,
    2335. 

  2335.                            $force_tag_closing,
    2336. 

  2336.                            $rm_attnames,
    2337. 

  2337.                            $bad_attvals,
    2338. 

  2338.                            $add_attr_to_tag,
    2339. 

  2339.                            $message,
    2340. 

  2340.                            $id,
    2341. 

  2341.                            $mailbox
    2342. 

  2342.                            );
    2343. 

  2343.     if (strpos($trusted,$secremoveimg)){
    2344. 

  2344.         $has_unsafe_images = true;
    2345. 

  2345.     }
    2346. 

  2346. 

  2347.     // we want to parse mailto's in HTML output, change to SM compose links
    2348. 

  2348.     // this is a modified version of code from url_parser.php... but Marc is
    2349. 

  2349.     // right: we need a better filtering implementation; adding this randomly
    2350. 

  2350.     // here is not a great solution
    2351. 

  2351.     //
    2352. 

  2352.     if ($take_mailto_links) {
    2353. 

  2353.         // parseUrl($trusted);   // this even parses URLs inside of tags... too aggressive
    2354. 

  2354.         global $MailTo_PReg_Match;
    2355. 

  2355.         $MailTo_PReg_Match = '/mailto:' . substr($MailTo_PReg_Match, 1) ;
    2356. 

  2356.         if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
    2357. 

  2357.             foreach ($regs[0] as $i => $mailto_before) {
    2358. 

  2358.                 $mailto_params = $regs[10][$i];
    2359. 

  2359.                 // get rid of any tailing quote since we have to add send_to to the end
    2360. 

  2360.                 //
    2361. 

  2361.                 if (substr($mailto_before, strlen($mailto_before) - 1) == '"')
    2362. 

  2362.                     $mailto_before = substr($mailto_before, 0, strlen($mailto_before) - 1);
    2363. 

  2363.                 if (substr($mailto_params, strlen($mailto_params) - 1) == '"')
    2364. 

  2364.                     $mailto_params = substr($mailto_params, 0, strlen($mailto_params) - 1);
    2365. 

  2365. 

  2366.                 if ($regs[1][$i]) {    //if there is an email addr before '?', we need to merge it with the params
    2367. 

  2367.                     $to = 'to=' . $regs[1][$i];
    2368. 

  2368.                     if (strpos($mailto_params, 'to=') > -1)    //already a 'to='
    2369. 

  2369.                         $mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
    2370. 

  2370.                     else {
    2371. 

  2371.                         if ($mailto_params)    //already some params, append to them
    2372. 

  2372.                             $mailto_params .= '&amp;' . $to;
    2373. 

  2373.                         else
    2374. 

  2374.                             $mailto_params .= '?' . $to;
    2375. 

  2375.                     }
    2376. 

  2376.                 }
    2377. 

  2377. 

  2378.                 $url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
    2379. 

  2379. 

  2380.                 // we'll already have target=_blank, no need to allow comp_in_new
    2381. 

  2381.                 // here (which would be a lot more work anyway)
    2382. 

  2382.                 //
    2383. 

  2383.                 global $compose_new_win;
    2384. 

  2384.                 $temp_comp_in_new = $compose_new_win;
    2385. 

  2385.                 $compose_new_win = 0;
    2386. 

  2386.                 $comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
    2387. 

  2387.                 $compose_new_win = $temp_comp_in_new;
    2388. 

  2388. 

  2389.                 // remove <a href=" and anything after the next quote (we only
    2390. 

  2390.                 // need the uri, not the link HTML) in compose uri
    2391. 

  2391.                 //
    2392. 

  2392.                 $comp_uri = substr($comp_uri, 9);
    2393. 

  2393.                 $comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
    2394. 

  2394.                 $trusted = str_replace($mailto_before, $comp_uri, $trusted);
    2395. 

  2395.             }
    2396. 

  2396.         }
    2397. 

  2397.     }
    2398. 

  2398. 

  2399.     return $trusted;
    2400. 

  2400. }
    2401. 

  2401. 

  2402. /**
    2403. 

  2403.  * function SendDownloadHeaders - send file to the browser
    2404. 

  2404.  *
    2405. 

  2405.  * Original Source: SM core src/download.php
    2406. 

  2406.  * moved here to make it available to other code, and separate
    2407. 

  2407.  * front end from back end functionality.
    2408. 

  2408.  *
    2409. 

  2409.  * @param string $type0 first half of mime type
    2410. 

  2410.  * @param string $type1 second half of mime type
    2411. 

  2411.  * @param string $filename filename to tell the browser for downloaded file
    2412. 

  2412.  * @param boolean $force whether to force the download dialog to pop
    2413. 

  2413.  * @param optional integer $filesize send the Content-Header and length to the browser
    2414. 

  2414.  * @return void
    2415. 

  2415.  */
    2416. 

  2416. function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
    2417. 

  2417.     global $languages, $squirrelmail_language;
    2418. 

  2418.     $isIE = $isIE6plus = false;
    2419. 

  2419. 

  2420.     sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
    2421. 

  2421. 

  2422.     if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
    2423. 

  2423.             strstr($HTTP_USER_AGENT, 'Opera') === false) {
    2424. 

  2424.         $isIE = true;
    2425. 

  2425.     }
    2426. 

  2426. 

  2427.     if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
    2428. 

  2428.         ((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
    2429. 

  2429.         $isIE6plus = true;
    2430. 

  2430.     }
    2431. 

  2431. 

  2432.     if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
    2433. 

  2433.             function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
    2434. 

  2434.         $filename =
    2435. 

  2435.             $languages[$squirrelmail_language]['XTRA_CODE']('downloadfilename', $filename, $HTTP_USER_AGENT);
    2436. 

  2436.     } else {
    2437. 

  2437.         $filename = ereg_replace('[\\/:\*\?"<>\|;]', '_', str_replace('&#32;', ' ', $filename));
    2438. 

  2438.     }
    2439. 

  2439. 

  2440.     // A Pox on Microsoft and it's Internet Explorer!
    2441. 

  2441.     //
    2442. 

  2442.     // IE has lots of bugs with file downloads.
    2443. 

  2443.     // It also has problems with SSL.  Both of these cause problems
    2444. 

  2444.     // for us in this function.
    2445. 

  2445.     //
    2446. 

  2446.     // See this article on Cache Control headers and SSL
    2447. 

  2447.     // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
    2448. 

  2448.     //
    2449. 

  2449.     // The best thing you can do for IE is to upgrade to the latest
    2450. 

  2450.     // version
    2451. 

  2451.     //set all the Cache Control Headers for IE
    2452. 

  2452.     if ($isIE) {
    2453. 

  2453.         $filename=rawurlencode($filename);
    2454. 

  2454.         header ("Pragma: public");
    2455. 

  2455.         header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
    2456. 

  2456.         header ("Cache-Control: post-check=0, pre-check=0", false);
    2457. 

  2457.         header ("Cache-Control: private");
    2458. 

  2458. 

  2459.         //set the inline header for IE, we'll add the attachment header later if we need it
    2460. 

  2460.         header ("Content-Disposition: inline; filename=$filename");
    2461. 

  2461.     }
    2462. 

  2462. 

  2463.     if (!$force) {
    2464. 

  2464.         // Try to show in browser window
    2465. 

  2465.         header ("Content-Disposition: inline; filename=\"$filename\"");
    2466. 

  2466.         header ("Content-Type: $type0/$type1; name=\"$filename\"");
    2467. 

  2467.     } else {
    2468. 

  2468.         // Try to pop up the "save as" box
    2469. 

  2469. 

  2470.         // IE makes this hard.  It pops up 2 save boxes, or none.
    2471. 

  2471.         // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
    2472. 

  2472.         // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
    2473. 

  2473.         // But, according to Microsoft, it is "RFC compliant but doesn't
    2474. 

  2474.         // take into account some deviations that allowed within the
    2475. 

  2475.         // specification."  Doesn't that mean RFC non-compliant?
    2476. 

  2476.         // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
    2477. 

  2477. 

  2478.         // all browsers need the application/octet-stream header for this
    2479. 

  2479.         header ("Content-Type: application/octet-stream; name=\"$filename\"");
    2480. 

  2480. 

  2481.         // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
    2482. 

  2482.         // Do not have quotes around filename, but that applied to
    2483. 

  2483.         // "attachment"... does it apply to inline too?
    2484. 

  2484.         header ("Content-Disposition: attachment; filename=\"$filename\"");
    2485. 

  2485. 

  2486.         if ($isIE && !$isIE6plus) {
    2487. 

  2487.             // This combination seems to work mostly.  IE 5.5 SP 1 has
    2488. 

  2488.             // known issues (see the Microsoft Knowledge Base)
    2489. 

  2489. 

  2490.             // This works for most types, but doesn't work with Word files
    2491. 

  2491.             header ("Content-Type: application/download; name=\"$filename\"");
    2492. 

  2492.             // This is to prevent IE for MIME sniffing and auto open a file in IE
    2493. 

  2493.             header ("Content-Type: application/force-download; name=\"$filename\"");
    2494. 

  2494.             // These are spares, just in case.  :-)
    2495. 

  2495.             //header("Content-Type: $type0/$type1; name=\"$filename\"");
    2496. 

  2496.             //header("Content-Type: application/x-msdownload; name=\"$filename\"");
    2497. 

  2497.             //header("Content-Type: application/octet-stream; name=\"$filename\"");
    2498. 

  2498.         } else if ($isIE) {
    2499. 

  2499.              // This is to prevent IE for MIME sniffing and auto open a file in IE
    2500. 

  2500.              header ("Content-Type: application/force-download; name=\"$filename\"");
    2501. 

  2501.         } else {
    2502. 

  2502.             // another application/octet-stream forces download for Netscape
    2503. 

  2503.             header ("Content-Type: application/octet-stream; name=\"$filename\"");
    2504. 

  2504.         }
    2505. 

  2505.     }
    2506. 

  2506. 

  2507.     //send the content-length header if the calling function provides it
    2508. 

  2508.     if ($filesize > 0) {
    2509. 

  2509.         header("Content-Length: $filesize");
    2510. 

  2510.     }
    2511. 

  2511. 

  2512. }  // end fn SendDownloadHeaders
    2513. 

  2513. 

  2514. ?>
    2515. 

  2515.