' => "\n", '
' => "\n", '
' => "\n", '
' => "\n", '
' => "\n", '>' => '>', '<' => '<'); $body = strtr($body, $entity_conv); $body = strip_tags($body); $body = trim($body); translateText($body, $wrap_at, $body_message->header->getParameter('charset')); } else { $charset = $body_message->header->getParameter('charset'); if (!empty($charset)) $body = charset_decode($charset,$body,false,true); $body = magicHTML($body, $id, $message, $mailbox); } } else { translateText($body, $wrap_at, $body_message->header->getParameter('charset')); } // if this is the clean display (i.e. printer friendly), stop here. if ( $clean ) { return $body; } /* * Previously the links for downloading and unsafe images were printed * under the mail. By putting the links in a global variable we can * print it in the toolbar where it belongs. Since the original code was * in this place it's left here. It might be possible to move it to some * other place if that makes sense. The possibility to do so has not * been evaluated yet. */ // Initialize the global variable to an empty string. $download_and_unsafe_link = ''; // Prepare and build a link for downloading the mail. $link = 'passed_id=' . $id . '&ent_id='.$ent_num. '&mailbox=' . $urlmailbox .'&sort=' . $sort . '&startMessage=' . $startMessage . '&show_more=0'; if (isset($passed_ent_id)) { $link .= '&passed_ent_id='.$passed_ent_id; } // Always add the link for downloading the mail as a file to the global // variable. $download_and_unsafe_link .= ' | ' . _("Download this as a file") . ''; // Find out the right text to use in the link depending on the // circumstances. If the unsafe images are displayed the link should // hide them, if they aren't displayed the link should only appear if // the mail really contains unsafe images. if ($view_unsafe_images) { $text = _("Hide Unsafe Images"); } else { if (isset($has_unsafe_images) && $has_unsafe_images) { $link .= '&view_unsafe_images=1'; $text = _("View Unsafe Images"); } else { $text = ''; } } // Only create a link for unsafe images if there's need for one. If so: // add it to the global variable. if($text != '') { $download_and_unsafe_link .= ' | ' . $text . ''; } } return $body; } function formatAttachments($message, $exclude_id, $mailbox, $id) { global $where, $what, $startMessage, $color, $passed_ent_id; static $ShownHTML = 0; $att_ar = $message->getAttachments($exclude_id); if (!count($att_ar)) return ''; $attachments = ''; $urlMailbox = urlencode($mailbox); foreach ($att_ar as $att) { $ent = $att->entity_id; $header = $att->header; $type0 = strtolower($header->type0); $type1 = strtolower($header->type1); $name = ''; $links['download link']['text'] = _("Download"); $links['download link']['href'] = SM_PATH . "src/download.php?absolute_dl=true&passed_id=$id&mailbox=$urlMailbox&ent_id=$ent"; $ImageURL = ''; if ($type0 =='message' && $type1 == 'rfc822') { $default_page = SM_PATH . 'src/read_body.php'; $rfc822_header = $att->rfc822_header; $filename = $rfc822_header->subject; if (trim( $filename ) == '') { $filename = 'untitled-[' . $ent . ']' ; } $from_o = $rfc822_header->from; if (is_object($from_o)) { $from_name = $from_o->getAddress(false); } elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) { // when a digest message is opened and you return to the digest // now the from object is part of an array. This is a workaround. $from_name = $from_o[0]->getAddress(false); } else { $from_name = _("Unknown sender"); } $from_name = decodeHeader(($from_name)); $description = $from_name; } else { $default_page = SM_PATH . 'src/download.php'; if (is_object($header->disposition)) { $filename = $header->disposition->getProperty('filename'); if (trim($filename) == '') { $name = decodeHeader($header->disposition->getProperty('name')); if (trim($name) == '') { $name = $header->getParameter('name'); if(trim($name) == '') { if (trim( $header->id ) == '') { $filename = 'untitled-[' . $ent . ']' ; } else { $filename = 'cid: ' . $header->id; } } else { $filename = $name; } } else { $filename = $name; } } } else { $filename = $header->getParameter('name'); if (!trim($filename)) { if (trim( $header->id ) == '') { $filename = 'untitled-[' . $ent . ']' ; } else { $filename = 'cid: ' . $header->id; } } } if ($header->description) { $description = decodeHeader($header->description); } else { $description = ''; } } $display_filename = $filename; if (isset($passed_ent_id)) { $passed_ent_id_link = '&passed_ent_id='.$passed_ent_id; } else { $passed_ent_id_link = ''; } $defaultlink = $default_page . "?startMessage=$startMessage" . "&passed_id=$id&mailbox=$urlMailbox" . '&ent_id='.$ent.$passed_ent_id_link; if ($where && $what) { $defaultlink .= '&where='. urlencode($where).'&what='.urlencode($what); } // IE does make use of mime content sniffing. Forcing a download // prohibit execution of XSS inside an application/octet-stream attachment if ($type0 == 'application' && $type1 == 'octet-stream') { $defaultlink .= '&absolute_dl=true'; } /* This executes the attachment hook with a specific MIME-type. * If that doesn't have results, it tries if there's a rule * for a more generic type. Finally, a hook for ALL attachment * types is run as well. */ $hookresults = do_hook("attachment $type0/$type1", $links, $startMessage, $id, $urlMailbox, $ent, $defaultlink, $display_filename, $where, $what); if(count($hookresults[1]) <= 1) { $hookresults = do_hook("attachment $type0/*", $links, $startMessage, $id, $urlMailbox, $ent, $defaultlink, $display_filename, $where, $what); } $hookresults = do_hook("attachment */*", $hookresults[1], $startMessage, $id, $urlMailbox, $ent, $hookresults[6], $display_filename, $where, $what); $links = $hookresults[1]; $defaultlink = $hookresults[6]; $attachments .= '' . ''.decodeHeader($display_filename).' ' . '' . show_readable_size($header->size) . ' ' . '[ '.htmlspecialchars($type0).'/'.htmlspecialchars($type1).' ] ' . ''; $attachments .= '' . $description . ''; $attachments .= ' '; $skipspaces = 1; foreach ($links as $val) { if ($skipspaces) { $skipspaces = 0; } else { $attachments .= ' | '; } $attachments .= '' . $val['text'] . ''; } unset($links); $attachments .= "\n"; } return $attachments; } function sqimap_base64_decode(&$string) { // Base64 encoded data goes in pairs of 4 bytes. To achieve on the // fly decoding (to reduce memory usage) you have to check if the // data has incomplete pairs // Remove the noise in order to check if the 4 bytes pairs are complete $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string); $sStringRem = ''; $iMod = strlen($string) % 4; if ($iMod) { $sStringRem = substr($string,-$iMod); // Check if $sStringRem contains padding characters if (substr($sStringRem,-1) != '=') { $string = substr($string,0,-$iMod); } else { $sStringRem = ''; } } $string = base64_decode($string); return $sStringRem; } /** * Decodes encoded message body * * This function decodes the body depending on the encoding type. * Currently quoted-printable and base64 encodings are supported. * decode_body hook was added to this function in 1.4.2/1.5.0 * @param string $body encoded message body * @param string $encoding used encoding * @return string decoded string * @since 1.0 */ function decodeBody($body, $encoding) { $body = str_replace("\r\n", "\n", $body); $encoding = strtolower($encoding); $encoding_handler = do_hook_function('decode_body', $encoding); // plugins get first shot at decoding the body if (!empty($encoding_handler) && function_exists($encoding_handler)) { $body = $encoding_handler('decode', $body); } elseif ($encoding == 'quoted-printable' || $encoding == 'quoted_printable') { /** * quoted_printable_decode() function is broken in older * php versions. Text with \r\n decoding was fixed only * in php 4.3.0. Minimal code requirement 4.0.4 + * str_replace("\r\n", "\n", $body); call. */ $body = quoted_printable_decode($body); } elseif ($encoding == 'base64') { $body = base64_decode($body); } // All other encodings are returned raw. return $body; } /** * Decodes headers * * This functions decode strings that is encoded according to * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text). * Patched by Christian Schmidt 23/03/2002 */ function decodeHeader ($string, $utfencode=true,$htmlsave=true,$decide=false) { global $languages, $squirrelmail_language,$default_charset; if (is_array($string)) { $string = implode("\n", $string); } if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) { $string = $languages[$squirrelmail_language]['XTRA_CODE']('decodeheader', $string); // Do we need to return at this point? // return $string; } $i = 0; $iLastMatch = -2; $encoded = false; $aString = explode(' ',$string); $ret = ''; foreach ($aString as $chunk) { if ($encoded && $chunk === '') { continue; } elseif ($chunk === '') { $ret .= ' '; continue; } $encoded = false; /* if encoded words are not separated by a linear-space-white we still catch them */ $j = $i-1; while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) { /* if the last chunk isn't an encoded string then put back the space, otherwise don't */ if ($iLastMatch !== $j) { if ($htmlsave) { $ret .= ' '; } else { $ret .= ' '; } } $iLastMatch = $i; $j = $i; if ($htmlsave) { $ret .= htmlspecialchars($res[1]); } else { $ret .= $res[1]; } $encoding = ucfirst($res[3]); /* decide about valid decoding */ if ($decide && is_conversion_safe($res[2])) { $can_be_encoded=true; } else { $can_be_encoded=false; } switch ($encoding) { case 'B': $replace = base64_decode($res[4]); if ($can_be_encoded) { // string is converted from one charset to another. sanitizing depends on $htmlsave $replace = charset_convert($res[2],$replace,$default_charset,$htmlsave); } elseif ($utfencode) { // string is converted to htmlentities and sanitized $replace = charset_decode($res[2],$replace); } elseif ($htmlsave) { // string is not converted, but still sanitized $replace = htmlspecialchars($replace); } $ret.= $replace; break; case 'Q': $replace = str_replace('_', ' ', $res[4]); $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))', $replace); if ($can_be_encoded) { // string is converted from one charset to another. sanitizing depends on $htmlsave $replace = charset_convert($res[2], $replace,$default_charset,$htmlsave); } elseif ($utfencode) { // string is converted to html entities and sanitized $replace = charset_decode($res[2], $replace); } elseif ($htmlsave) { // string is not converted, but still sanizited $replace = htmlspecialchars($replace); } $ret .= $replace; break; default: break; } $chunk = $res[5]; $encoded = true; } if (!$encoded) { if ($htmlsave) { $ret .= ' '; } else { $ret .= ' '; } } if (!$encoded && $htmlsave) { $ret .= htmlspecialchars($chunk); } else { $ret .= $chunk; } ++$i; } /* remove the first added space */ if ($ret) { if ($htmlsave) { $ret = substr($ret,5); } else { $ret = substr($ret,1); } } return $ret; } /** * Encodes header as quoted-printable * * Encode a string according to RFC 1522 for use in headers if it * contains 8-bit characters or anything that looks like it should * be encoded. */ function encodeHeader ($string) { global $default_charset, $languages, $squirrelmail_language; if (isset($languages[$squirrelmail_language]['XTRA_CODE']) && function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) { return $languages[$squirrelmail_language]['XTRA_CODE']('encodeheader', $string); } // Use B encoding for multibyte charsets $mb_charsets = array('utf-8','big5','gb2313','euc-kr'); if (in_array($default_charset,$mb_charsets) && in_array($default_charset,sq_mb_list_encodings()) && sq_is8bit($string)) { return encodeHeaderBase64($string,$default_charset); } elseif (in_array($default_charset,$mb_charsets) && sq_is8bit($string) && ! in_array($default_charset,sq_mb_list_encodings())) { // Add E_USER_NOTICE error here (can cause 'Cannot add header information' warning in compose.php) // trigger_error('encodeHeader: Multibyte character set unsupported by mbstring extension.',E_USER_NOTICE); } // Encode only if the string contains 8-bit characters or =? $j = strlen($string); $max_l = 75 - strlen($default_charset) - 7; $aRet = array(); $ret = ''; $iEncStart = $enc_init = false; $cur_l = $iOffset = 0; for($i = 0; $i < $j; ++$i) { switch($string{$i}) { case '"': case '=': case '<': case '>': case ',': case '?': case '_': if ($iEncStart === false) { $iEncStart = $i; } $cur_l+=3; if ($cur_l > ($max_l-2)) { /* if there is an stringpart that doesn't need encoding, add it */ $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset); $aRet[] = "=?$default_charset?Q?$ret?="; $iOffset = $i; $cur_l = 0; $ret = ''; $iEncStart = false; } else { $ret .= sprintf("=%02X",ord($string{$i})); } break; case '(': case ')': if ($iEncStart !== false) { $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset); $aRet[] = "=?$default_charset?Q?$ret?="; $iOffset = $i; $cur_l = 0; $ret = ''; $iEncStart = false; } break; case ' ': if ($iEncStart !== false) { $cur_l++; if ($cur_l > $max_l) { $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset); $aRet[] = "=?$default_charset?Q?$ret?="; $iOffset = $i; $cur_l = 0; $ret = ''; $iEncStart = false; } else { $ret .= '_'; } } break; default: $k = ord($string{$i}); if ($k > 126) { if ($iEncStart === false) { // do not start encoding in the middle of a string, also take the rest of the word. $sLeadString = substr($string,0,$i); $aLeadString = explode(' ',$sLeadString); $sToBeEncoded = array_pop($aLeadString); $iEncStart = $i - strlen($sToBeEncoded); $ret .= $sToBeEncoded; $cur_l += strlen($sToBeEncoded); } $cur_l += 3; /* first we add the encoded string that reached it's max size */ if ($cur_l > ($max_l-2)) { $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset); $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */ $cur_l = 3; $ret = ''; $iOffset = $i; $iEncStart = $i; } $enc_init = true; $ret .= sprintf("=%02X", $k); } else { if ($iEncStart !== false) { $cur_l++; if ($cur_l > $max_l) { $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset); $aRet[] = "=?$default_charset?Q?$ret?="; $iEncStart = false; $iOffset = $i; $cur_l = 0; $ret = ''; } else { $ret .= $string{$i}; } } } break; } } if ($enc_init) { if ($iEncStart !== false) { $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset); $aRet[] = "=?$default_charset?Q?$ret?="; } else { $aRet[] = substr($string,$iOffset); } $string = implode('',$aRet); } return $string; } /** * Encodes string according to rfc2047 B encoding header formating rules * * It is recommended way to encode headers with character sets that store * symbols in more than one byte. * * Function requires mbstring support. If required mbstring functions are missing, * function returns false and sets E_USER_WARNING level error message. * * Minimal requirements - php 4.0.6 with mbstring extension. Please note, * that mbstring functions will generate E_WARNING errors, if unsupported * character set is used. mb_encode_mimeheader function provided by php * mbstring extension is not used in order to get better control of header * encoding. * * Used php code functions - function_exists(), trigger_error(), strlen() * (is used with charset names and base64 strings). Used php mbstring * functions - mb_strlen and mb_substr. * * Related documents: rfc 2045 (BASE64 encoding), rfc 2047 (mime header * encoding), rfc 2822 (header folding) * * @param string $string header string that must be encoded * @param string $charset character set. Must be supported by mbstring extension. * Use sq_mb_list_encodings() to detect supported charsets. * @return string string encoded according to rfc2047 B encoding formating rules * @since 1.5.1 and 1.4.6 */ function encodeHeaderBase64($string,$charset) { /** * Check mbstring function requirements. */ if (! function_exists('mb_strlen') || ! function_exists('mb_substr')) { // set E_USER_WARNING trigger_error('encodeHeaderBase64: Required mbstring functions are missing.',E_USER_WARNING); // return false return false; } // initial return array $aRet = array(); /** * header length = 75 symbols max (same as in encodeHeader) * remove $charset length * remove =? ? ?= (5 chars) * remove 2 more chars (\r\n ?) */ $iMaxLength = 75 - strlen($charset) - 7; // set first character position $iStartCharNum = 0; // loop through all characters. count characters and not bytes. for ($iCharNum=1; $iCharNum<=mb_strlen($string,$charset); $iCharNum++) { // encode string from starting character to current character. $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset)); // Check encoded string length if(strlen($encoded_string)>$iMaxLength) { // if string exceeds max length, reduce number of encoded characters and add encoded string part to array $aRet[] = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum-1,$charset)); // set new starting character $iStartCharNum = $iCharNum-1; // encode last char (in case it is last character in string) $encoded_string = base64_encode(mb_substr($string,$iStartCharNum,$iCharNum-$iStartCharNum,$charset)); } // if string is shorter than max length - add next character } // add last encoded string to array $aRet[] = $encoded_string; // set initial return string $sRet = ''; // loop through encoded strings foreach($aRet as $string) { // TODO: Do we want to control EOL (end-of-line) marker if ($sRet!='') $sRet.= " "; // add header tags and encoded string to return string $sRet.= '=?'.$charset.'?B?'.$string.'?='; } return $sRet; } /* This function trys to locate the entity_id of a specific mime element */ function find_ent_id($id, $message) { for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities); $i++) { if ($message->entities[$i]->header->type0 == 'multipart') { $ret = find_ent_id($id, $message->entities[$i]); } else { if (strcasecmp($message->entities[$i]->header->id, $id) == 0) { // if (sq_check_save_extension($message->entities[$i])) { return $message->entities[$i]->entity_id; // } } elseif (!empty($message->entities[$i]->header->parameters['name'])) { /** * This is part of a fix for Outlook Express 6.x generating * cid URLs without creating content-id headers * @@JA - 20050207 */ if (strcasecmp($message->entities[$i]->header->parameters['name'], $id) == 0) { return $message->entities[$i]->entity_id; } } } } return $ret; } function sq_check_save_extension($message) { $filename = $message->getFilename(); $ext = substr($filename, strrpos($filename,'.')+1); $save_extensions = array('jpg','jpeg','gif','png','bmp'); return in_array($ext, $save_extensions); } /** ** HTMLFILTER ROUTINES */ /** * This function checks attribute values for entity-encoded values * and returns them translated into 8-bit strings so we can run * checks on them. * * @param $attvalue A string to run entity check against. * @return Nothing, modifies a reference value. */ function sq_defang(&$attvalue){ $me = 'sq_defang'; /** * Skip this if there aren't ampersands or backslashes. */ if (strpos($attvalue, '&') === false && strpos($attvalue, '\\') === false){ return; } $m = false; do { $m = false; $m = $m || sq_deent($attvalue, '/\�*(\d+);*/s'); $m = $m || sq_deent($attvalue, '/\�*((\d|[a-f])+);*/si', true); $m = $m || sq_deent($attvalue, '/\\\\(\d+)/s', true); } while ($m == true); $attvalue = stripslashes($attvalue); } /** * Kill any tabs, newlines, or carriage returns. Our friends the * makers of the browser with 95% market value decided that it'd * be funny to make "java[tab]script" be just as good as "javascript". * * @param attvalue The attribute value before extraneous spaces removed. * @return attvalue Nothing, modifies a reference value. */ function sq_unspace(&$attvalue){ $me = 'sq_unspace'; if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)){ $attvalue = str_replace(Array("\t", "\r", "\n", "\0", " "), Array('', '', '', '', ''), $attvalue); } } /** * Translate all dangerous Unicode or Shift_JIS characters which are accepted by * IE as regular characters. * * @param attvalue The attribute value before dangerous characters are translated. * @return attvalue Nothing, modifies a reference value. * @author Marc Groot Koerkamp. */ function sq_fixIE_idiocy(&$attvalue) { // remove NUL $attvalue = str_replace("\0", "", $attvalue); // remove comments $attvalue = preg_replace("/(\/\*.*?\*\/)/","",$attvalue); // IE has the evil habit of accepting every possible value for the attribute expression. // The table below contains characters which are parsed by IE if they are used in the "expression" // attribute value. $aDangerousCharsReplacementTable = array( array('ʟ', 'ʟ' ,/* L UNICODE IPA Extension */ 'ʀ', 'ʀ' ,/* R UNICODE IPA Extension */ 'ɴ', 'ɴ' ,/* N UNICODE IPA Extension */ 'Ｅ', 'Ｅ' ,/* Unicode FULLWIDTH LATIN CAPITAL LETTER E */ 'ｅ', 'ｅ' ,/* Unicode FULLWIDTH LATIN SMALL LETTER E */ 'Ｘ', 'Ｘ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER X */ 'ｘ', 'ｘ',/* Unicode FULLWIDTH LATIN SMALL LETTER X */ 'Ｐ', 'Ｐ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER P */ 'ｐ', 'ｐ',/* Unicode FULLWIDTH LATIN SMALL LETTER P */ 'Ｒ', 'Ｒ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER R */ 'ｒ', 'ｒ',/* Unicode FULLWIDTH LATIN SMALL LETTER R */ 'Ｓ', 'Ｓ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER S */ 'ｓ', 'ｓ',/* Unicode FULLWIDTH LATIN SMALL LETTER S */ 'Ｉ', 'Ｉ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER I */ 'ｉ', 'ｉ',/* Unicode FULLWIDTH LATIN SMALL LETTER I */ 'Ｏ', 'Ｏ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER O */ 'ｏ', 'ｏ',/* Unicode FULLWIDTH LATIN SMALL LETTER O */ 'Ｎ', 'Ｎ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER N */ 'ｎ', 'ｎ',/* Unicode FULLWIDTH LATIN SMALL LETTER N */ 'Ｌ', 'Ｌ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER L */ 'ｌ', 'ｌ',/* Unicode FULLWIDTH LATIN SMALL LETTER L */ 'Ｕ', 'Ｕ',/* Unicode FULLWIDTH LATIN CAPITAL LETTER U */ 'ｕ', 'ｕ',/* Unicode FULLWIDTH LATIN SMALL LETTER U */ 'ⁿ', 'ⁿ' ,/* Unicode SUPERSCRIPT LATIN SMALL LETTER N */ "\xEF\xBC\xA5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER E */ // in unicode this is some Chinese char range "\xEF\xBD\x85", /* Shift JIS FULLWIDTH LATIN SMALL LETTER E */ "\xEF\xBC\xB8", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER X */ "\xEF\xBD\x98", /* Shift JIS FULLWIDTH LATIN SMALL LETTER X */ "\xEF\xBC\xB0", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER P */ "\xEF\xBD\x90", /* Shift JIS FULLWIDTH LATIN SMALL LETTER P */ "\xEF\xBC\xB2", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER R */ "\xEF\xBD\x92", /* Shift JIS FULLWIDTH LATIN SMALL LETTER R */ "\xEF\xBC\xB3", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER S */ "\xEF\xBD\x93", /* Shift JIS FULLWIDTH LATIN SMALL LETTER S */ "\xEF\xBC\xA9", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER I */ "\xEF\xBD\x89", /* Shift JIS FULLWIDTH LATIN SMALL LETTER I */ "\xEF\xBC\xAF", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER O */ "\xEF\xBD\x8F", /* Shift JIS FULLWIDTH LATIN SMALL LETTER O */ "\xEF\xBC\xAE", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER N */ "\xEF\xBD\x8E", /* Shift JIS FULLWIDTH LATIN SMALL LETTER N */ "\xEF\xBC\xAC", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER L */ "\xEF\xBD\x8C", /* Shift JIS FULLWIDTH LATIN SMALL LETTER L */ "\xEF\xBC\xB5", /* Shift JIS FULLWIDTH LATIN CAPITAL LETTER U */ "\xEF\xBD\x95", /* Shift JIS FULLWIDTH LATIN SMALL LETTER U */ "\xE2\x81\xBF", /* Shift JIS FULLWIDTH SUPERSCRIPT N */ "\xCA\x9F", /* L UNICODE IPA Extension */ "\xCA\x80", /* R UNICODE IPA Extension */ "\xC9\xB4"), /* N UNICODE IPA Extension */ array('l', 'l', 'r','r','n','n', 'E','E','e','e','X','X','x','x','P','P','p','p','R','R','r','r','S','S','s','s','I','I', 'i','i','O','O','o','o','N','N','n','n','L','L','l','l','U','U','u','u','n','n', 'E','e','X','x','P','p','R','r','S','s','I','i','O','o','N','n','L','l','U','u','n','l','r','n')); $attvalue = str_replace($aDangerousCharsReplacementTable[0],$aDangerousCharsReplacementTable[1],$attvalue); // Escapes are useful for special characters like "{}[]()'&. In other cases they are // used for XSS. $attvalue = preg_replace("/(\\\\)([a-zA-Z]{1})/",'$2',$attvalue); } /** * This function returns the final tag out of the tag name, an array * of attributes, and the type of the tag. This function is called by * sq_sanitize internally. * * @param $tagname the name of the tag. * @param $attary the array of attributes and their values * @param $tagtype The type of the tag (see in comments). * @return a string with the final tag representation. */ function sq_tagprint($tagname, $attary, $tagtype){ $me = 'sq_tagprint'; if ($tagtype == 2){ $fulltag = ''; } else { $fulltag = '<' . $tagname; if (is_array($attary) && sizeof($attary)){ $atts = Array(); while (list($attname, $attvalue) = each($attary)){ array_push($atts, "$attname=$attvalue"); } $fulltag .= ' ' . join(" ", $atts); } if ($tagtype == 3){ $fulltag .= ' /'; } $fulltag .= '>'; } return $fulltag; } /** * A small helper function to use with array_walk. Modifies a by-ref * value and makes it lowercase. * * @param $val a value passed by-ref. * @return void since it modifies a by-ref value. */ function sq_casenormalize(&$val){ $val = strtolower($val); } /** * This function skips any whitespace from the current position within * a string and to the next non-whitespace value. * * @param $body the string * @param $offset the offset within the string where we should start * looking for the next non-whitespace character. * @return the location within the $body where the next * non-whitespace char is located. */ function sq_skipspace($body, $offset){ $me = 'sq_skipspace'; preg_match('/^(\s*)/s', substr($body, $offset), $matches); if (sizeof($matches{1})){ $count = strlen($matches{1}); $offset += $count; } return $offset; } /** * This function looks for the next character within a string. It's * really just a glorified "strpos", except it catches if failures * nicely. * * @param $body The string to look for needle in. * @param $offset Start looking from this position. * @param $needle The character/string to look for. * @return location of the next occurance of the needle, or * strlen($body) if needle wasn't found. */ function sq_findnxstr($body, $offset, $needle){ $me = 'sq_findnxstr'; $pos = strpos($body, $needle, $offset); if ($pos === FALSE){ $pos = strlen($body); } return $pos; } /** * This function takes a PCRE-style regexp and tries to match it * within the string. * * @param $body The string to look for needle in. * @param $offset Start looking from here. * @param $reg A PCRE-style regex to match. * @return Returns a false if no matches found, or an array * with the following members: * - integer with the location of the match within $body * - string with whatever content between offset and the match * - string with whatever it is we matched */ function sq_findnxreg($body, $offset, $reg){ $me = 'sq_findnxreg'; $matches = Array(); $retarr = Array(); preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches); if (!isset($matches{0}) || !$matches{0}){ $retarr = false; } else { $retarr{0} = $offset + strlen($matches{1}); $retarr{1} = $matches{1}; $retarr{2} = $matches{2}; } return $retarr; } /** * This function looks for the next tag. * * @param $body String where to look for the next tag. * @param $offset Start looking from here. * @return false if no more tags exist in the body, or * an array with the following members: * - string with the name of the tag * - array with attributes and their values * - integer with tag type (1, 2, or 3) * - integer where the tag starts (starting "<") * - integer where the tag ends (ending ">") * first three members will be false, if the tag is invalid. */ function sq_getnxtag($body, $offset){ $me = 'sq_getnxtag'; if ($offset > strlen($body)){ return false; } $lt = sq_findnxstr($body, $offset, "<"); if ($lt == strlen($body)){ return false; } /** * We are here: * blah blah * \---------^ */ $pos = sq_skipspace($body, $lt+1); if ($pos >= strlen($body)){ return Array(false, false, false, $lt, strlen($body)); } /** * There are 3 kinds of tags: * 1. Opening tag, e.g.: * * 2. Closing tag, e.g.: * * 3. XHTML-style content-less tag, e.g.: *

*/ $tagtype = false; switch (substr($body, $pos, 1)){ case '/': $tagtype = 2; $pos++; break; case '!': /** * A comment or an SGML declaration. */ if (substr($body, $pos+1, 2) == "--"){ $gt = strpos($body, "-->", $pos); if ($gt === false){ $gt = strlen($body); } else { $gt += 2; } return Array(false, false, false, $lt, $gt); } else { $gt = sq_findnxstr($body, $pos, ">"); return Array(false, false, false, $lt, $gt); } break; default: /** * Assume tagtype 1 for now. If it's type 3, we'll switch values * later. */ $tagtype = 1; break; } $tag_start = $pos; $tagname = ''; /** * Look for next [\W-_], which will indicate the end of the tag name. */ $regary = sq_findnxreg($body, $pos, "[^\w\-_]"); if ($regary == false){ return Array(false, false, false, $lt, strlen($body)); } list($pos, $tagname, $match) = $regary; $tagname = strtolower($tagname); /** * $match can be either of these: * '>' indicating the end of the tag entirely. * '\s' indicating the end of the tag name. * '/' indicating that this is type-3 xhtml tag. * * Whatever else we find there indicates an invalid tag. */ switch ($match){ case '/': /** * This is an xhtml-style tag with a closing / at the * end, like so:

. Check if it's followed * by the closing bracket. If not, then this tag is invalid */ if (substr($body, $pos, 2) == "/>"){ $pos++; $tagtype = 3; } else { $gt = sq_findnxstr($body, $pos, ">"); $retary = Array(false, false, false, $lt, $gt); return $retary; } case '>': $attary{$attname} = '"yes"'; return Array($tagname, $attary, $tagtype, $lt, $pos); break; default: /** * Skip whitespace and see what we arrive at. */ $pos = sq_skipspace($body, $pos); $char = substr($body, $pos, 1); /** * Two things are valid here: * '=' means this is attribute type 1 2 or 3. * \w means this was attribute type 4. * anything else we ignore and re-loop. End of tag and * invalid stuff will be caught by our checks at the beginning * of the loop. */ if ($char == "="){ $pos++; $pos = sq_skipspace($body, $pos); /** * Here are 3 possibilities: * "'" attribute type 1 * '"' attribute type 2 * everything else is the content of tag type 3 */ $quot = substr($body, $pos, 1); if ($quot == "'"){ $regary = sq_findnxreg($body, $pos+1, "\'"); if ($regary == false){ return Array(false, false, false, $lt, strlen($body)); } list($pos, $attval, $match) = $regary; $pos++; $attary{$attname} = "'" . $attval . "'"; } else if ($quot == '"'){ $regary = sq_findnxreg($body, $pos+1, '\"'); if ($regary == false){ return Array(false, false, false, $lt, strlen($body)); } list($pos, $attval, $match) = $regary; $pos++; $attary{$attname} = '"' . $attval . '"'; } else { /** * These are hateful. Look for \s, or >. */ $regary = sq_findnxreg($body, $pos, "[\s>]"); if ($regary == false){ return Array(false, false, false, $lt, strlen($body)); } list($pos, $attval, $match) = $regary; /** * If it's ">" it will be caught at the top. */ $attval = preg_replace("/\"/s", """, $attval); $attary{$attname} = '"' . $attval . '"'; } } else if (preg_match("|[\w/>]|", $char)) { /** * That was attribute type 4. */ $attary{$attname} = '"yes"'; } else { /** * An illegal character. Find next '>' and return. */ $gt = sq_findnxstr($body, $pos, ">"); return Array(false, false, false, $lt, $gt); } break; } } /** * The fact that we got here indicates that the tag end was never * found. Return invalid tag indication so it gets stripped. */ return Array(false, false, false, $lt, strlen($body)); } /** * Translates entities into literal values so they can be checked. * * @param $attvalue the by-ref value to check. * @param $regex the regular expression to check against. * @param $hex whether the entites are hexadecimal. * @return True or False depending on whether there were matches. */ function sq_deent(&$attvalue, $regex, $hex=false){ $me = 'sq_deent'; $ret_match = false; preg_match_all($regex, $attvalue, $matches); if (is_array($matches) && sizeof($matches[0]) > 0){ $repl = Array(); for ($i = 0; $i < sizeof($matches[0]); $i++){ $numval = $matches[1][$i]; if ($hex){ $numval = hexdec($numval); } $repl{$matches[0][$i]} = chr($numval); } $attvalue = strtr($attvalue, $repl); return true; } else { return false; } } /** * This function runs various checks against the attributes. * * @param $tagname String with the name of the tag. * @param $attary Array with all tag attributes. * @param $rm_attnames See description for sq_sanitize * @param $bad_attvals See description for sq_sanitize * @param $add_attr_to_tag See description for sq_sanitize * @param $message message object * @param $id message id * @param $mailbox mailbox * @return Array with modified attributes. */ function sq_fixatts($tagname, $attary, $rm_attnames, $bad_attvals, $add_attr_to_tag, $message, $id, $mailbox ){ $me = 'sq_fixatts'; while (list($attname, $attvalue) = each($attary)){ /** * See if this attribute should be removed. */ foreach ($rm_attnames as $matchtag=>$matchattrs){ if (preg_match($matchtag, $tagname)){ foreach ($matchattrs as $matchattr){ if (preg_match($matchattr, $attname)){ unset($attary{$attname}); continue; } } } } /** * Workaround for IE quirks */ sq_fixIE_idiocy($attvalue); /** * Remove any backslashes, entities, and extraneous whitespace. */ $oldattvalue = $attvalue; sq_defang($attvalue); if ($attname == 'style' && $attvalue !== $oldattvalue) { // entities are used in the attribute value. In 99% of the cases it's there as XSS // i.e.

$attvalue = "idiocy"; $attary{$attname} = $attvalue; } sq_unspace($attvalue); /** * Now let's run checks on the attvalues. * I don't expect anyone to comprehend this. If you do, * get in touch with me so I can drive to where you live and * shake your hand personally. :) */ foreach ($bad_attvals as $matchtag=>$matchattrs){ if (preg_match($matchtag, $tagname)){ foreach ($matchattrs as $matchattr=>$valary){ if (preg_match($matchattr, $attname)){ /** * There are two arrays in valary. * First is matches. * Second one is replacements */ list($valmatch, $valrepl) = $valary; $newvalue = preg_replace($valmatch, $valrepl, $attvalue); if ($newvalue != $attvalue){ $attary{$attname} = $newvalue; $attvalue = $newvalue; } } } } } if ($attname == 'style') { if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) { // 8bit and control characters in style attribute values can be used for XSS, remove them $attary{$attname} = '"disallowed character"'; } preg_match_all("/url\s*$(.+)$/si",$attvalue,$aMatch); if (count($aMatch)) { foreach($aMatch[1] as $sMatch) { // url value $urlvalue = $sMatch; sq_fix_url($attname, $urlvalue, $message, $id, $mailbox,"'"); $attary{$attname} = str_replace($sMatch,$urlvalue,$attvalue); } } } /** * Use white list based filtering on attributes which can contain url's */ else if ($attname == 'href' || $attname == 'src' || $attname == 'background') { sq_fix_url($attname, $attvalue, $message, $id, $mailbox); $attary{$attname} = $attvalue; } } /** * See if we need to append any attributes to this tag. */ foreach ($add_attr_to_tag as $matchtag=>$addattary){ if (preg_match($matchtag, $tagname)){ $attary = array_merge($attary, $addattary); } } return $attary; } /** * This function filters url's * * @param $attvalue String with attribute value to filter * @param $message message object * @param $id message id * @param $mailbox mailbox * @param $sQuote quoting characters around url's */ function sq_fix_url($attname, &$attvalue, $message, $id, $mailbox,$sQuote = '"') { $attvalue = trim($attvalue); if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) { // remove the double quotes $sQuote = $attvalue[0]; $attvalue = trim(substr($attvalue,1,-1)); } // If there's no "view_unsafe_images" variable in the URL, turn unsafe // images off by default. if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET) ) { $view_unsafe_images = false; } $secremoveimg = '../images/' . _("sec_remove_eng.png"); /** * Replace empty src tags with the blank image. src is only used * for frames, images, and image inputs. Doing a replace should * not affect them working as should be, however it will stop * IE from being kicked off when src for img tags are not set */ if ($attvalue == '') { $attvalue = '"' . SM_PATH . 'images/blank.png"'; } else { // first, disallow 8 bit characters and control characters if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) { switch ($attname) { case 'href': $attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote; break; default: $attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote; break; } } else { $aUrl = parse_url($attvalue); if (isset($aUrl['scheme'])) { switch(strtolower($aUrl['scheme'])) { case 'mailto': case 'http': case 'https': case 'ftp': if ($attname != 'href') { if ($view_unsafe_images == false) { $attvalue = $sQuote . $secremoveimg . $sQuote; } else { if (isset($aUrl['path'])) { // No one has been able to show that image URIs // can be exploited, so for now, no restrictions // are made at all. If this proves to be a problem, // the commented-out code below can be of help. // (One consideration is that I see nothing in this // function that specifically says that we will // only ever arrive here when inspecting an image // tag, although that does seem to be the end // result - e.g.,

' . _("Body retrieval error. The reason for this is most probably that the message is malformed.") . '
' . _("Command:") . "	$cmd
' . _("Response:") . "	$response
' . _("Message:") . "	$message
' . _("FETCH line:") . "	$topline