2997 lines
120 KiB
PHP
2997 lines
120 KiB
PHP
<?php
|
||
|
||
/**
|
||
* mime.php
|
||
*
|
||
* This contains the functions necessary to detect and decode MIME
|
||
* messages.
|
||
*
|
||
* @copyright 1999-2025 The SquirrelMail Project Team
|
||
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
|
||
* @version $Id$
|
||
* @package squirrelmail
|
||
*/
|
||
|
||
/**
|
||
* dependency information
|
||
functions dependency
|
||
mime_structure
|
||
class/mime/Message.class.php
|
||
Message::parseStructure
|
||
functions/page_header.php
|
||
displayPageHeader
|
||
functions/display_messages.php
|
||
plain_error_message
|
||
mime_fetch_body
|
||
functions/imap_general.php
|
||
sqimap_run_command
|
||
mime_print_body_lines
|
||
|
||
|
||
|
||
functions/imap.php
|
||
functions/attachment_common.php
|
||
functions/display_messages.php
|
||
|
||
magicHtml => url_parser
|
||
translateText => url_parser
|
||
|
||
*/
|
||
|
||
|
||
/* -------------------------------------------------------------------------- */
|
||
/* MIME DECODING */
|
||
/* -------------------------------------------------------------------------- */
|
||
|
||
/**
|
||
* Get the MIME structure
|
||
*
|
||
* This function gets the structure of a message and stores it in the "message" class.
|
||
* It will return this object for use with all relevant header information and
|
||
* fully parsed into the standard "message" object format.
|
||
*/
|
||
function mime_structure ($bodystructure, $flags=array()) {
|
||
|
||
/* Isolate the body structure and remove beginning and end parenthesis. */
|
||
$read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') + 13));
|
||
$read = trim(substr ($read, 0, -1));
|
||
$i = 0;
|
||
$msg = Message::parseStructure($read,$i);
|
||
|
||
if (!is_object($msg)) {
|
||
global $color, $mailbox;
|
||
displayPageHeader( $color, $mailbox );
|
||
$errormessage = _("SquirrelMail could not decode the bodystructure of the message");
|
||
$errormessage .= '<br />'._("The bodystructure provided by your IMAP server:").'<br /><br />';
|
||
$errormessage .= '<pre>' . sm_encode_html_special_chars($read) . '</pre>';
|
||
plain_error_message( $errormessage );
|
||
echo '</body></html>';
|
||
exit;
|
||
}
|
||
if (count($flags)) {
|
||
foreach ($flags as $flag) {
|
||
//FIXME: please document why it is we have to check the first char of the flag but we then go ahead and do a full string comparison anyway. Is this a speed enhancement? If not, let's keep it simple and just compare the full string and forget the switch block.
|
||
$char = strtoupper($flag[1]);
|
||
switch ($char) {
|
||
case 'S':
|
||
if (strtolower($flag) == '\\seen') {
|
||
$msg->is_seen = true;
|
||
}
|
||
break;
|
||
case 'A':
|
||
if (strtolower($flag) == '\\answered') {
|
||
$msg->is_answered = true;
|
||
}
|
||
break;
|
||
case 'D':
|
||
if (strtolower($flag) == '\\deleted') {
|
||
$msg->is_deleted = true;
|
||
}
|
||
break;
|
||
case 'F':
|
||
if (strtolower($flag) == '\\flagged') {
|
||
$msg->is_flagged = true;
|
||
}
|
||
else if (strtolower($flag) == '$forwarded') {
|
||
$msg->is_forwarded = true;
|
||
}
|
||
break;
|
||
case 'M':
|
||
if (strtolower($flag) == '$mdnsent') {
|
||
$msg->is_mdnsent = true;
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
// listEntities($msg);
|
||
return $msg;
|
||
}
|
||
|
||
|
||
|
||
/* This starts the parsing of a particular structure. It is called recursively,
|
||
* so it can be passed different structures. It returns an object of type
|
||
* $message.
|
||
* First, it checks to see if it is a multipart message. If it is, then it
|
||
* handles that as it sees is necessary. If it is just a regular entity,
|
||
* then it parses it and adds the necessary header information (by calling out
|
||
* to mime_get_elements()
|
||
*/
|
||
|
||
function mime_fetch_body($imap_stream, $id, $ent_id=1, $fetch_size=0) {
|
||
/* Do a bit of error correction. If we couldn't find the entity id, just guess
|
||
* that it is the first one. That is usually the case anyway.
|
||
*/
|
||
|
||
if (!$ent_id) {
|
||
$cmd = "FETCH $id BODY[]";
|
||
} else {
|
||
$cmd = "FETCH $id BODY[$ent_id]";
|
||
}
|
||
|
||
if ($fetch_size!=0) $cmd .= "<0.$fetch_size>";
|
||
|
||
$data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, TRUE);
|
||
do {
|
||
$topline = trim(array_shift($data));
|
||
} while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH .*BODY.*/i', $topline)) ;
|
||
// Matching with "BODY" above is difficult: in most cases "FETCH \(BODY" would work
|
||
// but some servers may put other things in the same result, perhaps something such
|
||
// as "* 23 FETCH (FLAGS (\Seen) BODY[1] {174}". There is some small chance that
|
||
// if the character sequence "BODY" appears in a response where it isn't actually
|
||
// a FETCH response data item name, the current regex will break things. The better
|
||
// way to do this would be to parse the response correctly and not use a regex.
|
||
|
||
$wholemessage = implode('', $data);
|
||
if (preg_match('/\{([^\}]*)\}/', $topline, $regs)) {
|
||
$ret = substr($wholemessage, 0, $regs[1]);
|
||
/* There is some information in the content info header that could be important
|
||
* in order to parse html messages. Let's get them here.
|
||
*/
|
||
// if ($ret[0] == '<') {
|
||
// $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, TRUE);
|
||
// }
|
||
} else if (preg_match('/"([^"]*)"/', $topline, $regs)) {
|
||
$ret = $regs[1];
|
||
} else if ((stristr($topline, 'nil') !== false) && (empty($wholemessage))) {
|
||
$ret = $wholemessage;
|
||
} else {
|
||
global $where, $what, $mailbox, $passed_id, $startMessage;
|
||
$par = 'mailbox=' . urlencode($mailbox) . '&passed_id=' . $passed_id;
|
||
if (isset($where) && isset($what)) {
|
||
$par .= '&where=' . urlencode($where) . '&what=' . urlencode($what);
|
||
} else {
|
||
$par .= '&startMessage=' . $startMessage . '&show_more=0';
|
||
}
|
||
$par .= '&response=' . urlencode($response) .
|
||
'&message=' . urlencode($message) .
|
||
'&topline=' . urlencode($topline);
|
||
|
||
echo '<tt><br />' .
|
||
'<table width="80%"><tr>' .
|
||
'<tr><td colspan="2">' .
|
||
_("Body retrieval error. The reason for this is most probably that the message is malformed.") .
|
||
'</td></tr>' .
|
||
'<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
|
||
'<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
|
||
'<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
|
||
'<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
|
||
"</table><br /></tt></font><hr />";
|
||
|
||
$data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, TRUE);
|
||
array_shift($data);
|
||
$wholemessage = implode('', $data);
|
||
|
||
$ret = $wholemessage;
|
||
}
|
||
return $ret;
|
||
}
|
||
|
||
// TODO: Needs documentation. $ent_id default is usually 1
|
||
function mime_print_body_lines ($imap_stream, $id, $ent_id, $encoding, $rStream='php://stdout', $force_crlf='') {
|
||
|
||
/* Don't kill the connection if the browser is over a dialup
|
||
* and it would take over 30 seconds to download it.
|
||
* Don't call set_time_limit in safe mode.
|
||
*/
|
||
|
||
if (!ini_get('safe_mode')) {
|
||
set_time_limit(0);
|
||
}
|
||
/* in case of base64 encoded attachments, do not buffer them.
|
||
Instead, echo the decoded attachment directly to screen */
|
||
if (strtolower($encoding) == 'base64') {
|
||
if (!$ent_id) {
|
||
$query = "FETCH $id BODY[]";
|
||
} else {
|
||
$query = "FETCH $id BODY[$ent_id]";
|
||
}
|
||
sqimap_run_command($imap_stream,$query,true,$response,$message,TRUE,'sqimap_base64_decode',$rStream,true);
|
||
} else {
|
||
$body = mime_fetch_body ($imap_stream, $id, $ent_id);
|
||
if (is_resource($rStream)) {
|
||
fputs($rStream,decodeBody($body, $encoding, $force_crlf));
|
||
} else {
|
||
echo decodeBody($body, $encoding, $force_crlf);
|
||
}
|
||
}
|
||
|
||
/*
|
||
TODO, use the same method for quoted printable.
|
||
However, I assume that quoted printable attachments aren't that large
|
||
so the performancegain / memory usage drop will be minimal.
|
||
If we decide to add that then we need to adapt sqimap_fread because
|
||
we need to split te result on \n and fread doesn't stop at \n. That
|
||
means we also should provide $results from sqimap_fread (by ref) to
|
||
te function and set $no_return to false. The $filter function for
|
||
quoted printable should handle unsetting of $results.
|
||
*/
|
||
/*
|
||
TODO 2: find out how we write to the output stream php://stdout. fwrite
|
||
doesn't work because 'php://stdout isn't a stream.
|
||
*/
|
||
|
||
return;
|
||
}
|
||
|
||
/* -[ END MIME DECODING ]----------------------------------------------------------- */
|
||
|
||
/* This is here for debugging purposes. It will print out a list
|
||
* of all the entity IDs that are in the $message object.
|
||
*/
|
||
function listEntities ($message) {
|
||
if ($message) {
|
||
echo "<tt>" . $message->entity_id . ' : ' . $message->type0 . '/' . $message->type1 . ' parent = '. $message->parent->entity_id. '<br />';
|
||
for ($i = 0; isset($message->entities[$i]); $i++) {
|
||
echo "$i : ";
|
||
$msg = listEntities($message->entities[$i]);
|
||
|
||
if ($msg) {
|
||
echo "return: ";
|
||
return $msg;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
function getPriorityStr($priority) {
|
||
$priority_level = substr($priority,0,1);
|
||
|
||
switch($priority_level) {
|
||
/* Check for a higher then normal priority. */
|
||
case '1':
|
||
case '2':
|
||
$priority_string = _("High");
|
||
break;
|
||
|
||
/* Check for a lower then normal priority. */
|
||
case '4':
|
||
case '5':
|
||
$priority_string = _("Low");
|
||
break;
|
||
|
||
/* Check for a normal priority. */
|
||
case '3':
|
||
default:
|
||
$priority_level = '3';
|
||
$priority_string = _("Normal");
|
||
break;
|
||
|
||
}
|
||
return $priority_string;
|
||
}
|
||
|
||
/* returns a $message object for a particular entity id */
|
||
function getEntity ($message, $ent_id) {
|
||
return $message->getEntity($ent_id);
|
||
}
|
||
|
||
/* translateText
|
||
* Extracted from strings.php 23/03/2002
|
||
*/
|
||
|
||
function translateText(&$body, $wrap_at, $charset) {
|
||
global $where, $what; /* from searching */
|
||
global $color; /* color theme */
|
||
|
||
// require_once(SM_PATH . 'functions/url_parser.php');
|
||
|
||
$body_ary = explode("\n", $body);
|
||
for ($i=0; $i < count($body_ary); $i++) {
|
||
$line = rtrim($body_ary[$i],"\r");
|
||
|
||
if (strlen($line) - 2 >= $wrap_at) {
|
||
sqWordWrap($line, $wrap_at, $charset);
|
||
}
|
||
$line = charset_decode($charset, $line);
|
||
$line = str_replace("\t", ' ', $line);
|
||
|
||
parseUrl ($line);
|
||
|
||
$quotes = 0;
|
||
$pos = 0;
|
||
$j = strlen($line);
|
||
|
||
while ($pos < $j) {
|
||
if ($line[$pos] == ' ') {
|
||
$pos++;
|
||
} else if (strpos($line, '>', $pos) === $pos) {
|
||
$pos += 4;
|
||
$quotes++;
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
|
||
if ($quotes % 2) {
|
||
$line = '<span class="quote1">' . $line . '</span>';
|
||
} elseif ($quotes) {
|
||
$line = '<span class="quote2">' . $line . '</span>';
|
||
}
|
||
|
||
$body_ary[$i] = $line;
|
||
}
|
||
$body = '<pre>' . implode("\n", $body_ary) . '</pre>';
|
||
}
|
||
|
||
/**
|
||
* This returns a parsed string called $body. That string can then
|
||
* be displayed as the actual message in the HTML. It contains
|
||
* everything needed, including HTML Tags, Attachments at the
|
||
* bottom, etc.
|
||
*
|
||
* Since 1.2.0 function uses message_body hook.
|
||
* Till 1.3.0 function included output of formatAttachments().
|
||
*
|
||
* @param resource $imap_stream imap connection resource
|
||
* @param object $message squirrelmail message object
|
||
* @param array $color squirrelmail color theme array
|
||
* @param integer $wrap_at number of characters per line
|
||
* @param string $ent_num (since 1.3.0) message part id
|
||
* @param integer $id (since 1.3.0) message id
|
||
* @param string $mailbox (since 1.3.0) imap folder name
|
||
* @return string html formated message text
|
||
*/
|
||
function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX') {
|
||
/* This if statement checks for the entity to show as the
|
||
* primary message. To add more of them, just put them in the
|
||
* order that is their priority.
|
||
*/
|
||
global $startMessage, $languages, $squirrelmail_language,
|
||
$show_html_default, $sort, $has_unsafe_images, $passed_ent_id,
|
||
$use_iframe, $iframe_height, $download_and_unsafe_link,
|
||
$download_href, $unsafe_image_toggle_href, $unsafe_image_toggle_text,
|
||
$oTemplate, $nbsp;
|
||
|
||
// workaround for not updated config.php
|
||
if (! isset($use_iframe)) $use_iframe = false;
|
||
|
||
// If there's no "view_unsafe_images" variable in the URL, turn unsafe
|
||
// images off by default.
|
||
sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
|
||
|
||
$body = '';
|
||
$urlmailbox = urlencode($mailbox);
|
||
$body_message = getEntity($message, $ent_num);
|
||
if (($body_message->header->type0 == 'text') ||
|
||
($body_message->header->type0 == 'rfc822')) {
|
||
$body = mime_fetch_body ($imap_stream, $id, $ent_num);
|
||
$body = decodeBody($body, $body_message->header->encoding);
|
||
|
||
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
|
||
function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode')) {
|
||
if (mb_detect_encoding($body) != 'ASCII') {
|
||
$body = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode',$body);
|
||
}
|
||
}
|
||
|
||
/* As of 1.5.2, $body is passed (and modified) by reference */
|
||
do_hook('message_body', $body);
|
||
|
||
/* If there are other types that shouldn't be formatted, add
|
||
* them here.
|
||
*/
|
||
|
||
if ($body_message->header->type1 == 'html') {
|
||
// Do we need to make an HTML part viewable as non-HTML plain text?
|
||
if ($show_html_default != 1) {
|
||
$entity_conv = array(' ' => ' ',
|
||
// These are better done by regex (below)
|
||
// '<p>' => "\n",
|
||
// '<P>' => "\n",
|
||
// '<br>' => "\n",
|
||
// '<BR>' => "\n",
|
||
// '<br />' => "\n",
|
||
// '<BR />' => "\n",
|
||
// '<tr>' => "\n",
|
||
// '<div>' => "\n",
|
||
'>' => '>',
|
||
'<' => '<',
|
||
'&' => '&',
|
||
'©' => '<27>');
|
||
// first, completely remove <style> tags as they aren't useful in this context
|
||
$body = preg_replace('/<style.*>.*<\/style.*>/isU', '', $body);
|
||
// emulate how newlines are treated as spaces in HTML
|
||
$body = preg_replace('/(\r|\n)+/', ' ', $body);
|
||
// now replace the tags listed just above
|
||
$body = strtr($body, $entity_conv);
|
||
// <p>, <br>, <tr> and <div> are best replaced by a newline
|
||
$body = preg_replace('/<(p|br|tr|div).*>/isU', "\n", $body);
|
||
// remove the rest of the HTML tags
|
||
$body = strip_tags($body);
|
||
// condense multiple spaces into one
|
||
$body = preg_replace('/[ \t]+/', ' ', $body);
|
||
// trim each line
|
||
$body = preg_replace('/ *\n */', "\n", $body);
|
||
// allow maximum two newlines
|
||
$body = preg_replace('/\n\n\n+/', "\n\n", $body);
|
||
$body = trim($body);
|
||
translateText($body, $wrap_at,
|
||
$body_message->header->getParameter('charset'));
|
||
} elseif ($use_iframe) {
|
||
/**
|
||
* If we don't add html message between iframe tags,
|
||
* we must detect unsafe images and modify $has_unsafe_images.
|
||
*/
|
||
$html_body = magicHTML($body, $id, $message, $mailbox);
|
||
// Convert character set in order to display html mails in different character set
|
||
$html_body = charset_decode($body_message->header->getParameter('charset'),$html_body,false,true);
|
||
|
||
// creating iframe url
|
||
$iframeurl=sqm_baseuri().'src/view_html.php?'
|
||
. 'mailbox=' . $urlmailbox
|
||
. '&passed_id=' . $id
|
||
. '&ent_id=' . $ent_num
|
||
. '&view_unsafe_images=' . (int) $view_unsafe_images;
|
||
|
||
global $oTemplate;
|
||
$oTemplate->assign('iframe_url', $iframeurl);
|
||
$oTemplate->assign('iframe_height', $iframe_height);
|
||
$oTemplate->assign('html_body', $html_body);
|
||
|
||
$body = $oTemplate->fetch('read_html_iframe.tpl');
|
||
} else {
|
||
// old way of html rendering
|
||
/**
|
||
* convert character set. charset_decode does not remove html special chars
|
||
* applied by magicHTML functions and does not sanitize them second time if
|
||
* fourth argument is true.
|
||
*/
|
||
$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'));
|
||
}
|
||
|
||
/*
|
||
* 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.
|
||
// FIXME: To have $download_and_unsafe_link as a global variable might not be needed since the use of separate variables ($download_href, $unsafe_image_toggle_href, and $unsafe_image_toggle_text) for the templates was introduced.
|
||
$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;
|
||
}
|
||
$download_href = SM_PATH . 'src/download.php?absolute_dl=true&' . $link;
|
||
|
||
// Always add the link for downloading the mail as a file to the global
|
||
// variable.
|
||
$download_and_unsafe_link .= "$nbsp|$nbsp"
|
||
. create_hyperlink($download_href, _("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 != '') {
|
||
$unsafe_image_toggle_href = SM_PATH . 'src/read_body.php?'.$link;
|
||
$unsafe_image_toggle_text = $text;
|
||
$download_and_unsafe_link .= "$nbsp|$nbsp"
|
||
. create_hyperlink($unsafe_image_toggle_href, $text);
|
||
}
|
||
}
|
||
return $body;
|
||
}
|
||
|
||
/**
|
||
* Generate attachments array for passing to templates.
|
||
*
|
||
* @since 1.5.2
|
||
* @param object $message SquirrelMail message object
|
||
* @param array $exclude_id message parts that are not attachments.
|
||
* @param string $mailbox mailbox name
|
||
* @param integer $id message id
|
||
*/
|
||
function buildAttachmentArray($message, $exclude_id, $mailbox, $id) {
|
||
global $where, $what, $startMessage, $color, $passed_ent_id,
|
||
$base_uri, $block_svg_download;
|
||
|
||
$att_ar = $message->getAttachments($exclude_id);
|
||
$urlMailbox = urlencode($mailbox);
|
||
|
||
$attachments = array();
|
||
foreach ($att_ar as $att) {
|
||
$ent = $att->entity_id;
|
||
$header = $att->header;
|
||
$type0 = strtolower($header->type0);
|
||
$type1 = strtolower($header->type1);
|
||
if ($block_svg_download && strpos($type1, 'svg') === 0)
|
||
continue;
|
||
|
||
$name = '';
|
||
$links = array();
|
||
$links['download link']['text'] = _("Download");
|
||
$links['download link']['href'] = $base_uri .
|
||
"src/download.php?absolute_dl=true&passed_id=$id&mailbox=$urlMailbox&ent_id=$ent";
|
||
|
||
if ($type0 =='message' && $type1 == 'rfc822') {
|
||
$default_page = $base_uri . '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)) {
|
||
$from_name = decodeHeader($from_o->getAddress(false));
|
||
} elseif (is_array($from_o) && count($from_o) && is_object($from_o[0])) {
|
||
// something weird happens when a digest message is opened and you return to the digest
|
||
// now the from object is part of an array. Probably the parseHeader call overwrites the info
|
||
// retrieved from the bodystructure in a different way. We need to fix this later.
|
||
// possible starting point, do not fetch header we already have and inspect how
|
||
// the rfc822_header object behaves.
|
||
$from_name = decodeHeader($from_o[0]->getAddress(false));
|
||
} else {
|
||
$from_name = _("Unknown sender");
|
||
}
|
||
$description = _("From").': '.$from_name;
|
||
} else {
|
||
$default_page = $base_uri . 'src/download.php';
|
||
$filename = $att->getFilename();
|
||
if ($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.
|
||
* It also allows plugins to run if there's a rule for a more
|
||
* generic type. Finally, a hook for ALL attachment types is
|
||
* run as well.
|
||
*/
|
||
// First remember the default link.
|
||
$defaultlink_orig = $defaultlink;
|
||
|
||
/* The API for this hook has changed as of 1.5.2 so that all plugin
|
||
arguments are passed in an array instead of each their own plugin
|
||
argument, and arguments are passed by reference, so instead of
|
||
returning any changes, changes should simply be made to the original
|
||
arguments themselves. */
|
||
$temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
|
||
&$defaultlink, &$display_filename, &$where, &$what,
|
||
&$type0, &$type1);
|
||
do_hook("attachment $type0/$type1", $temp);
|
||
/* The API for this hook has changed as of 1.5.2 so that all plugin
|
||
arguments are passed in an array instead of each their own plugin
|
||
argument, and arguments are passed by reference, so instead of
|
||
returning any changes, changes should simply be made to the original
|
||
arguments themselves. */
|
||
$temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
|
||
&$defaultlink, &$display_filename, &$where, &$what,
|
||
&$type0, &$type1);
|
||
// Do not let a generic plugin change the default link if a more
|
||
// specialized one already did it...
|
||
if ($defaultlink != $defaultlink_orig) {
|
||
$dummy = '';
|
||
$temp[5] = &$dummy;
|
||
}
|
||
do_hook("attachment $type0/*", $temp);
|
||
/* The API for this hook has changed as of 1.5.2 so that all plugin
|
||
arguments are passed in an array instead of each their own plugin
|
||
argument, and arguments are passed by reference, so instead of
|
||
returning any changes, changes should simply be made to the original
|
||
arguments themselves. */
|
||
$temp = array(&$links, &$startMessage, &$id, &$urlMailbox, &$ent,
|
||
&$defaultlink, &$display_filename, &$where, &$what,
|
||
&$type0, &$type1);
|
||
// Do not let a generic plugin change the default link if a more
|
||
// specialized one already did it...
|
||
if ($defaultlink != $defaultlink_orig) {
|
||
$dummy = '';
|
||
$temp[5] = &$dummy;
|
||
}
|
||
do_hook("attachment */*", $temp);
|
||
|
||
$this_attachment = array();
|
||
$this_attachment['Name'] = decodeHeader($display_filename);
|
||
$this_attachment['Description'] = $description;
|
||
$this_attachment['DefaultHREF'] = $defaultlink;
|
||
$this_attachment['DownloadHREF'] = $links['download link']['href'];
|
||
$this_attachment['ViewHREF'] = isset($links['attachment_common']) ? $links['attachment_common']['href'] : '';
|
||
|
||
// base64 encoded file sizes are misleading, so approximate real size
|
||
if (!empty($header->encoding) && strtolower($header->encoding) == 'base64')
|
||
$this_attachment['Size'] = $header->size / 4 * 3;
|
||
else
|
||
$this_attachment['Size'] = $header->size;
|
||
|
||
$this_attachment['ContentType'] = sm_encode_html_special_chars($type0 .'/'. $type1);
|
||
$this_attachment['OtherLinks'] = array();
|
||
foreach ($links as $val) {
|
||
if ($val['text']==_("Download")) {
|
||
$this_attachment['DownloadHREF'] = $val['href'];
|
||
continue;
|
||
}
|
||
if ($val['text']==_("View")) {
|
||
$this_attachment['ViewHREF'] = $val['href'];
|
||
continue;
|
||
}
|
||
|
||
// This makes no sense - If 'text' and 'extra' are just concatenated,
|
||
// there is no point in having 'extra'.... I am going to assume this
|
||
// was a mistake and am changing 'extra' to be what I think it was
|
||
// meant to be: additional tag attributes. However, I'm not checking
|
||
// extensively for plugins that were using this the wrong way (but why would they?)
|
||
if (empty($val['text']))
|
||
continue;
|
||
|
||
$temp = array();
|
||
$temp['HREF'] = $val['href'];
|
||
$temp['Text'] = $val['text'];
|
||
$temp['Extra'] = (empty($val['extra']) ? '' : $val['extra']);
|
||
$this_attachment['OtherLinks'][] = $temp;
|
||
}
|
||
$attachments[] = $this_attachment;
|
||
|
||
unset($links);
|
||
}
|
||
|
||
return $attachments;
|
||
}
|
||
|
||
/**
|
||
* Displays attachment links and information
|
||
*
|
||
* Since 1.3.0 function is not included in formatBody() call.
|
||
*
|
||
* Since 1.0.2 uses attachment $type0/$type1 hook.
|
||
* Since 1.2.5 uses attachment $type0/* hook.
|
||
* Since 1.5.0 uses attachments_bottom hook.
|
||
* Since 1.5.2 uses templates and does *not* return a value.
|
||
*
|
||
* @param object $message SquirrelMail message object
|
||
* @param array $exclude_id message parts that are not attachments.
|
||
* @param string $mailbox mailbox name
|
||
* @param integer $id message id
|
||
*/
|
||
function formatAttachments($message, $exclude_id, $mailbox, $id) {
|
||
global $oTemplate;
|
||
|
||
$attach = buildAttachmentArray($message, $exclude_id, $mailbox, $id);
|
||
|
||
$oTemplate->assign('attachments', $attach);
|
||
$oTemplate->display('read_attachments.tpl');
|
||
}
|
||
|
||
function sqimap_base64_decode(&$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 string (usually message body)
|
||
*
|
||
* This function decodes a string (usually the message body)
|
||
* depending on the encoding type. Currently quoted-printable
|
||
* and base64 encodings are supported.
|
||
*
|
||
* The decode_body hook was added to this function in 1.4.2/1.5.0.
|
||
* The $force_crlf parameter was added in 1.5.2.
|
||
*
|
||
* @param string $string The encoded string
|
||
* @param string $encoding used encoding
|
||
* @param string $force_crlf Whether or not to force CRLF or LF
|
||
* line endings (or to leave as is).
|
||
* If given as "LF", line endings will
|
||
* all be converted to LF; if "CRLF",
|
||
* line endings will all be converted
|
||
* to CRLF. If given as an empty value,
|
||
* the global $force_crlf_default will
|
||
* be consulted (it can be specified in
|
||
* config/config_local.php). Otherwise,
|
||
* any other value will cause the string
|
||
* to be left alone. Note that this will
|
||
* be overridden to "LF" if not using at
|
||
* least PHP version 4.3.0. (OPTIONAL;
|
||
* default is empty - consult global
|
||
* default value)
|
||
*
|
||
* @return string The decoded string
|
||
*
|
||
* @since 1.0
|
||
*
|
||
*/
|
||
function decodeBody($string, $encoding, $force_crlf='') {
|
||
|
||
global $force_crlf_default;
|
||
if (empty($force_crlf)) $force_crlf = $force_crlf_default;
|
||
$force_crlf = strtoupper($force_crlf);
|
||
|
||
// must force line endings to LF due to broken
|
||
// quoted_printable_decode() in PHP versions
|
||
// before 4.3.0 (see below)
|
||
//
|
||
if (!check_php_version(4, 3, 0) || $force_crlf == 'LF')
|
||
$string = str_replace("\r\n", "\n", $string);
|
||
else if ($force_crlf == 'CRLF')
|
||
$string = str_replace("\n", "\r\n", $string);
|
||
|
||
$encoding = strtolower($encoding);
|
||
|
||
$encoding_handler = do_hook('decode_body', $encoding);
|
||
|
||
|
||
// plugins get first shot at decoding the string
|
||
//
|
||
if (!empty($encoding_handler) && function_exists($encoding_handler)) {
|
||
$string = $encoding_handler('decode', $string);
|
||
|
||
} elseif ($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 is PHP 4.0.4+
|
||
// and the above call to: str_replace("\r\n", "\n", $string);
|
||
//
|
||
$string = quoted_printable_decode($string);
|
||
|
||
} elseif ($encoding == 'base64') {
|
||
$string = base64_decode($string);
|
||
}
|
||
|
||
// All other encodings are returned raw.
|
||
return $string;
|
||
}
|
||
|
||
/**
|
||
* Decodes headers
|
||
*
|
||
* This function decodes strings that are encoded according to
|
||
* RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
|
||
* Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
|
||
*
|
||
* @param string $string header string that has to be made readable
|
||
* @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
|
||
* @param boolean $htmlsafe preserve spaces and sanitize html special characters. defaults to true
|
||
* @param boolean $decide decide if string can be utfencoded. defaults to false
|
||
* @return string decoded header string
|
||
*/
|
||
function decodeHeader ($string, $utfencode=true,$htmlsafe=true,$decide=false) {
|
||
global $languages, $squirrelmail_language,$default_charset, $fix_broken_base64_encoded_messages;
|
||
if (is_array($string)) {
|
||
$string = implode("\n", $string);
|
||
}
|
||
|
||
// loose type checking also catches $string === NULL here:
|
||
if ($string == '')
|
||
return '';
|
||
|
||
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
|
||
function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
|
||
$string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
|
||
// Do we need to return at this point?
|
||
// return $string;
|
||
}
|
||
$i = 0;
|
||
$iLastMatch = -2;
|
||
$encoded = true;
|
||
|
||
// FIXME: spaces are allowed inside quoted-printable encoding, but the following line will bust up any such encoded strings
|
||
$aString = explode(' ',$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 !== $j) {
|
||
if ($htmlsafe) {
|
||
$ret .= ' ';
|
||
} else {
|
||
$ret .= ' ';
|
||
}
|
||
}
|
||
$iLastMatch = $i;
|
||
$j = $i;
|
||
if ($htmlsafe) {
|
||
$ret .= sm_encode_html_special_chars($res[1]);
|
||
} else {
|
||
$ret .= $res[1];
|
||
}
|
||
$encoding = ucfirst($res[3]);
|
||
|
||
/* decide about valid decoding */
|
||
if ($decide && is_conversion_safe($res[2])) {
|
||
$utfencode=true;
|
||
$can_be_encoded=true;
|
||
} else {
|
||
$can_be_encoded=false;
|
||
}
|
||
switch ($encoding)
|
||
{
|
||
case 'B':
|
||
// fix broken base64-encoded strings (remove end = padding,
|
||
// change any = to + in middle of string, add padding back
|
||
// to the end)
|
||
if ($fix_broken_base64_encoded_messages) {
|
||
$encoded_string_minus_padding = strtr(rtrim($res[4], '='), '=', '+');
|
||
$res[4] = str_pad($encoded_string_minus_padding, strlen($res[4]), '=');
|
||
}
|
||
$replace = base64_decode($res[4]);
|
||
if ($utfencode) {
|
||
if ($can_be_encoded) {
|
||
/* convert string to different charset,
|
||
* if functions asks for it (usually in compose)
|
||
*/
|
||
$ret .= charset_convert($res[2],$replace,$default_charset,$htmlsafe);
|
||
} else {
|
||
// convert string to html codes in order to display it
|
||
$ret .= charset_decode($res[2],$replace);
|
||
}
|
||
} else {
|
||
if ($htmlsafe) {
|
||
$replace = sm_encode_html_special_chars($replace);
|
||
}
|
||
$ret.= $replace;
|
||
}
|
||
break;
|
||
case 'Q':
|
||
$replace = str_replace('_', ' ', $res[4]);
|
||
$replace = preg_replace_callback('/=([0-9a-f]{2})/i',
|
||
(check_php_version(5, 3, 0)
|
||
? function($matches) { return chr(hexdec($matches[1])); }
|
||
: create_function ('$matches', 'return chr(hexdec($matches[1]));')
|
||
),
|
||
$replace);
|
||
if ($utfencode) {
|
||
if ($can_be_encoded) {
|
||
/* convert string to different charset,
|
||
* if functions asks for it (usually in compose)
|
||
*/
|
||
$replace = charset_convert($res[2], $replace,$default_charset,$htmlsafe);
|
||
} else {
|
||
// convert string to html codes in order to display it
|
||
$replace = charset_decode($res[2], $replace);
|
||
}
|
||
} else {
|
||
if ($htmlsafe) {
|
||
$replace = sm_encode_html_special_chars($replace);
|
||
}
|
||
}
|
||
$ret .= $replace;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
$chunk = $res[5];
|
||
$encoded = true;
|
||
}
|
||
if (!$encoded) {
|
||
if ($htmlsafe) {
|
||
$ret .= ' ';
|
||
} else {
|
||
$ret .= ' ';
|
||
}
|
||
}
|
||
|
||
// It is possible to slip XSS in here when a header has encoded content followed by unecoded malicious content --- this test was written long ago, but because the leftover $chunk has not been classified or handled in any way, we can't assume it is safe to include as-is.... We'll assume the person who wrote this if() would agree and didn't mean to accidentally allow such and that what they meant was the following corrected line:
|
||
// if (!$encoded && $htmlsafe) {
|
||
if ($htmlsafe) {
|
||
$ret .= sm_encode_html_special_chars($chunk);
|
||
} else {
|
||
$ret .= $chunk;
|
||
}
|
||
++$i;
|
||
}
|
||
/* remove the first added space */
|
||
if ($ret) {
|
||
if ($htmlsafe) {
|
||
$ret = substr($ret,5);
|
||
} else {
|
||
$ret = substr($ret,1);
|
||
}
|
||
}
|
||
|
||
return $ret;
|
||
}
|
||
|
||
/**
|
||
* Encodes header
|
||
*
|
||
* Function uses XTRA_CODE _encodeheader function, if such function exists.
|
||
*
|
||
* Function uses Q encoding by default and encodes 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 switches to B encoding and encodeHeaderBase64() function, if
|
||
* string is 8bit and multibyte character set supported by mbstring extension
|
||
* is used. It can cause E_USER_NOTICE errors, if interface is used with
|
||
* multibyte character set unsupported by mbstring extension.
|
||
*
|
||
* @param string $string header string, that has to be encoded
|
||
* @return string quoted-printable encoded string
|
||
* @todo make $mb_charsets system wide constant
|
||
*/
|
||
function encodeHeader ($string) {
|
||
global $default_charset, $languages, $squirrelmail_language;
|
||
|
||
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
|
||
function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
|
||
return call_user_func($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
|
||
* @todo First header line can be wrapped to $iMaxLength - $HeaderFieldLength - 1
|
||
* @todo Do we want to control max length of header?
|
||
* @todo Do we want to control EOL (end-of-line) marker?
|
||
* @todo Do we want to translate error message?
|
||
*/
|
||
function encodeHeaderBase64($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;
|
||
// before deent, translate the dangerous unicode characters and ... to safe values
|
||
// otherwise the regular expressions do not match.
|
||
|
||
|
||
|
||
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 = '</' . $tagname . '>';
|
||
} else {
|
||
$fulltag = '<' . $tagname;
|
||
if (is_array($attary) && sizeof($attary)){
|
||
$atts = Array();
|
||
foreach ($attary as $attname => $attvalue){
|
||
array_push($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), $matches);
|
||
if (!empty($matches[1])){
|
||
$offset += strlen($matches[1]);
|
||
}
|
||
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 <tag attribute="value">
|
||
* \---------^
|
||
*/
|
||
$pos = sq_skipspace($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.:
|
||
* <a href="blah">
|
||
* 2. Closing tag, e.g.:
|
||
* </a>
|
||
* 3. XHTML-style content-less tag, e.g.:
|
||
* <img src="blah" />
|
||
*/
|
||
$tagtype = false;
|
||
switch (substr($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: <img src="blah" />. 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 $retary;
|
||
}
|
||
case '>':
|
||
return Array($tagname, false, $tagtype, $lt, $pos);
|
||
break;
|
||
default:
|
||
/**
|
||
* Check if it's whitespace
|
||
*/
|
||
if (!preg_match('/\s/', $match)){
|
||
/**
|
||
* This is an invalid tag! Look for the next closing ">".
|
||
*/
|
||
$gt = sq_findnxstr($body, $lt, ">");
|
||
return Array(false, false, false, $lt, $gt);
|
||
}
|
||
break;
|
||
}
|
||
|
||
/**
|
||
* At this point we're here:
|
||
* <tagname attribute='blah'>
|
||
* \-------^
|
||
*
|
||
* At this point we loop in order to find all attributes.
|
||
*/
|
||
$attname = '';
|
||
$atttype = false;
|
||
$attary = Array();
|
||
|
||
while ($pos <= strlen($body)){
|
||
$pos = sq_skipspace($body, $pos);
|
||
if ($pos == strlen($body)){
|
||
/**
|
||
* Non-closed tag.
|
||
*/
|
||
return Array(false, false, false, $lt, $pos);
|
||
}
|
||
/**
|
||
* See if we arrived at a ">" or "/>", which means that we reached
|
||
* the end of the tag.
|
||
*/
|
||
$matches = Array();
|
||
if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
|
||
/**
|
||
* Yep. So we did.
|
||
*/
|
||
$pos += strlen($matches[1]);
|
||
if ($matches[2] == "/>"){
|
||
$tagtype = 3;
|
||
$pos++;
|
||
}
|
||
return Array($tagname, $attary, $tagtype, $lt, $pos);
|
||
}
|
||
|
||
/**
|
||
* There are several types of attributes, with optional
|
||
* [:space:] between members.
|
||
* Type 1:
|
||
* attrname[:space:]=[:space:]'CDATA'
|
||
* Type 2:
|
||
* attrname[:space:]=[:space:]"CDATA"
|
||
* Type 3:
|
||
* attr[:space:]=[:space:]CDATA
|
||
* Type 4:
|
||
* attrname
|
||
*
|
||
* We leave types 1 and 2 the same, type 3 we check for
|
||
* '"' and convert to """ if needed, then wrap in
|
||
* double quotes. Type 4 we convert into:
|
||
* attrname="yes".
|
||
*/
|
||
$regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
|
||
if ($regary == false){
|
||
/**
|
||
* Looks like body ended before the end of tag.
|
||
*/
|
||
return Array(false, false, false, $lt, strlen($body));
|
||
}
|
||
list($pos, $attname, $match) = $regary;
|
||
$attname = strtolower($attname);
|
||
/**
|
||
* We arrived at the end of attribute name. Several things possible
|
||
* here:
|
||
* '>' means the end of the tag and this is attribute type 4
|
||
* '/' if followed by '>' means the same thing as above
|
||
* '\s' means a lot of things -- look what it's followed by.
|
||
* anything else means the attribute is invalid.
|
||
*/
|
||
switch($match){
|
||
case '/':
|
||
/**
|
||
* This is an xhtml-style tag with a closing / at the
|
||
* end, like so: <img src="blah" />. Check if it's followed
|
||
* by the closing bracket. If not, then this tag is invalid
|
||
*/
|
||
if (substr($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';
|
||
$ret_match = false;
|
||
// remove comments
|
||
//$attvalue = preg_replace("/(\/\*.*\*\/)/","",$attvalue);
|
||
preg_match_all($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 $id message id
|
||
* @return Array with modified attributes.
|
||
*/
|
||
function sq_fixatts($tagname,
|
||
$attary,
|
||
$rm_attnames,
|
||
$bad_attvals,
|
||
$add_attr_to_tag,
|
||
$message,
|
||
$id,
|
||
$mailbox
|
||
){
|
||
$me = 'sq_fixatts';
|
||
foreach ($attary as $attname => $attvalue){
|
||
/**
|
||
* See if this attribute should be removed.
|
||
*/
|
||
foreach ($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.<div style="{ left:expʀessioɴ( alert('XSS') ) }">
|
||
$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 == 'xlink:href' || $attname == 'src'
|
||
|| $attname == 'poster' || $attname == 'formaction'
|
||
|| $attname == 'background' || $attname == 'action') {
|
||
sq_fix_url($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.
|
||
sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
|
||
|
||
global $use_transparent_security_image;
|
||
if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
|
||
else $secremoveimg = '../images/' . _("sec_remove_eng.png");
|
||
|
||
/**
|
||
* Replace empty src tags with the blank image. src is only used
|
||
* for frames, images, and image inputs. Doing a replace should
|
||
* not affect them working as should be, however it will stop
|
||
* IE from being kicked off when src for img tags are not set
|
||
*/
|
||
if ($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., <script src="..."> where malicious
|
||
// image URIs are in fact a problem are already
|
||
// filtered out elsewhere.
|
||
/* ---------------------------------
|
||
// validate image extension.
|
||
$ext = strtolower(substr($aUrl['path'],strrpos($aUrl['path'],'.')));
|
||
if (!in_array($ext,array('.jpeg','.jpg','xjpeg','.gif','.bmp','.jpe','.png','.xbm'))) {
|
||
// If URI is to something other than
|
||
// a regular image file, get the contents
|
||
// and try to see if it is an image.
|
||
// Don't use Fileinfo (finfo_file()) because
|
||
// we'd need to make the admin configure the
|
||
// location of the magic.mime file (FIXME: add finfo_file() support later?)
|
||
//
|
||
$mime_type = '';
|
||
if (function_exists('mime_content_type')
|
||
&& ($FILE = @fopen($attvalue, 'rb', FALSE))) {
|
||
|
||
// fetch file
|
||
//
|
||
$file_contents = '';
|
||
while (!feof($FILE)) {
|
||
$file_contents .= fread($FILE, 8192);
|
||
}
|
||
fclose($FILE);
|
||
|
||
// store file locally
|
||
//
|
||
global $attachment_dir, $username;
|
||
$hashed_attachment_dir = getHashedDir($username, $attachment_dir);
|
||
$localfilename = GenerateRandomString(32, '', 7);
|
||
$full_localfilename = "$hashed_attachment_dir/$localfilename";
|
||
while (file_exists($full_localfilename)) {
|
||
$localfilename = GenerateRandomString(32, '', 7);
|
||
$full_localfilename = "$hashed_attachment_dir/$localfilename";
|
||
}
|
||
$FILE = fopen("$hashed_attachment_dir/$localfilename", 'wb');
|
||
fwrite($FILE, $file_contents);
|
||
fclose($FILE);
|
||
|
||
// get mime type and remove file
|
||
//
|
||
$mime_type = mime_content_type("$hashed_attachment_dir/$localfilename");
|
||
unlink("$hashed_attachment_dir/$localfilename");
|
||
}
|
||
// debug: echo "$attvalue FILE TYPE IS $mime_type<HR>";
|
||
if (substr(strtolower($mime_type), 0, 5) != 'image') {
|
||
$attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
|
||
}
|
||
}
|
||
--------------------------------- */
|
||
} else {
|
||
$attvalue = $sQuote . SM_PATH . 'images/blank.png'. $sQuote;
|
||
}
|
||
}
|
||
} else {
|
||
$attvalue = $sQuote . $attvalue . $sQuote;
|
||
}
|
||
break;
|
||
case 'outbind':
|
||
/**
|
||
* "Hack" fix for Outlook using propriatary outbind:// protocol in img tags.
|
||
* One day MS might actually make it match something useful, for now, falling
|
||
* back to using cid2http, so we can grab the blank.png.
|
||
*/
|
||
$attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
|
||
break;
|
||
case 'cid':
|
||
/**
|
||
* Turn cid: urls into http-friendly ones.
|
||
*/
|
||
$attvalue = $sQuote . sq_cid2http($message, $id, $attvalue, $mailbox) . $sQuote;
|
||
break;
|
||
default:
|
||
$attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
|
||
break;
|
||
}
|
||
} else {
|
||
if (!isset($aUrl['path']) || $aUrl['path'] != $secremoveimg) {
|
||
// parse_url did not lead to satisfying result
|
||
$attvalue = $sQuote . SM_PATH . 'images/blank.png' . $sQuote;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* This function edits the style definition to make them friendly and
|
||
* usable in SquirrelMail.
|
||
*
|
||
* @param $message the message object
|
||
* @param $id the message id
|
||
* @param $content a string with whatever is between <style> and </style>
|
||
* @param $mailbox the message mailbox
|
||
* @return a string with edited content.
|
||
*/
|
||
function sq_fixstyle($body, $pos, $message, $id, $mailbox){
|
||
$me = 'sq_fixstyle';
|
||
// workaround for </style> in between comments
|
||
$iCurrentPos = $pos;
|
||
$content = '';
|
||
$sToken = '';
|
||
$bSucces = false;
|
||
$bEndTag = false;
|
||
for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
|
||
$char = $body[$i];
|
||
switch ($char) {
|
||
case '<':
|
||
$sToken = $char;
|
||
break;
|
||
case '/':
|
||
if ($sToken == '<') {
|
||
$sToken .= $char;
|
||
$bEndTag = true;
|
||
} else {
|
||
$content .= $char;
|
||
}
|
||
break;
|
||
case '>':
|
||
if ($bEndTag) {
|
||
$sToken .= $char;
|
||
if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
|
||
$newpos = $i + 1;
|
||
$bSucces = true;
|
||
break 2;
|
||
} else {
|
||
$content .= $sToken;
|
||
}
|
||
$bEndTag = false;
|
||
} else {
|
||
$content .= $char;
|
||
}
|
||
break;
|
||
case '!':
|
||
if ($sToken == '<') {
|
||
// possible comment
|
||
if (isset($body[$i+2]) && substr($body,$i,3) == '!--') {
|
||
$i = strpos($body,'-->',$i+3);
|
||
if ($i === false) { // no end comment
|
||
$i = strlen($body);
|
||
}
|
||
$sToken = '';
|
||
}
|
||
} else {
|
||
$content .= $char;
|
||
}
|
||
break;
|
||
default:
|
||
if ($bEndTag) {
|
||
$sToken .= $char;
|
||
} else {
|
||
$content .= $char;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
if ($bSucces == FALSE){
|
||
return array(FALSE, strlen($body));
|
||
}
|
||
|
||
|
||
|
||
/**
|
||
* First look for general BODY style declaration, which would be
|
||
* like so:
|
||
* body {background: blah-blah}
|
||
* and change it to .bodyclass so we can just assign it to a <div>
|
||
*/
|
||
// $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
|
||
// Nah, this is even better - try to preface all CSS selectors with
|
||
// our <div> class ID "bodyclass" then correct generic "body" selectors
|
||
// TODO: this works pretty good but breaks stuff like this:
|
||
// @media print { body { font-size: 10pt; } }
|
||
// but there isn't an easy way to make this regex skip @media
|
||
// definitions... though lots of the ones in the wild will be
|
||
// correctly handled because they tend to end with a parenthesis, like:
|
||
// @media screen and (max-width:480px) { ...
|
||
$content = preg_replace('/([a-z0-9._-][a-z0-9 >+~|:._-]*\s*(?:,|{.*?}))/si', '.bodyclass $1', $content);
|
||
$content = str_replace('.bodyclass body', '.bodyclass', $content);
|
||
|
||
global $use_transparent_security_image;
|
||
if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
|
||
else $secremoveimg = '../images/' . _("sec_remove_eng.png");
|
||
|
||
/**
|
||
* Fix url('blah') declarations.
|
||
*/
|
||
// $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
|
||
// "url(\\1$secremoveimg\\2)", $content);
|
||
|
||
// first check for 8bit sequences and disallowed control characters
|
||
if (preg_match('/[\16-\37\200-\377]+/',$content)) {
|
||
$content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
|
||
return array($content, $newpos);
|
||
}
|
||
|
||
// IE Sucks hard. We have a special function for it.
|
||
sq_fixIE_idiocy($content);
|
||
|
||
// remove @import line
|
||
$content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
|
||
|
||
// translate ur\l and variations (IE parses that)
|
||
// TODO check if the sq_fixIE_idiocy function already handles this.
|
||
$content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
|
||
preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
|
||
if (count($aMatch)) {
|
||
$aValue = $aReplace = array();
|
||
foreach($aMatch[1] as $sMatch) {
|
||
// url value
|
||
$urlvalue = $sMatch;
|
||
sq_fix_url('style',$urlvalue, $message, $id, $mailbox,"'");
|
||
$aValue[] = $sMatch;
|
||
$aReplace[] = $urlvalue;
|
||
}
|
||
$content = str_replace($aValue,$aReplace,$content);
|
||
}
|
||
|
||
/**
|
||
* Remove any backslashes, entities, and extraneous whitespace.
|
||
*/
|
||
$contentTemp = $content;
|
||
sq_defang($contentTemp);
|
||
sq_unspace($contentTemp);
|
||
|
||
/**
|
||
* Fix stupid css declarations which lead to vulnerabilities
|
||
* in IE.
|
||
*
|
||
* Also remove "position" attribute, as it can easily be set
|
||
* to "fixed" or "absolute" with "left" and "top" attributes
|
||
* of zero, taking over the whole content frame. It can also
|
||
* be set to relative and move itself anywhere it wants to,
|
||
* displaying content in areas it shouldn't be allowed to touch.
|
||
*/
|
||
$match = Array('/\/\*.*\*\//', // removes /* blah blah */
|
||
'/expression/i',
|
||
'/behaviou*r/i',
|
||
'/binding/i',
|
||
'/include-source/i',
|
||
'/javascript/i',
|
||
'/script/i',
|
||
'/position/i');
|
||
$replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
|
||
$contentNew = preg_replace($match, $replace, $contentTemp);
|
||
if ($contentNew !== $contentTemp) {
|
||
// insecure css declarations are used. From now on we don't care
|
||
// anymore if the css is destroyed by sq_deent, sq_unspace or sq_unbackslash
|
||
$content = $contentNew;
|
||
}
|
||
return array($content, $newpos);
|
||
}
|
||
|
||
|
||
/**
|
||
* This function converts cid: url's into the ones that can be viewed in
|
||
* the browser.
|
||
*
|
||
* @param $message the message object
|
||
* @param $id the message id
|
||
* @param $cidurl the cid: url.
|
||
* @param $mailbox the message mailbox
|
||
* @return a string with a http-friendly url
|
||
*/
|
||
function sq_cid2http($message, $id, $cidurl, $mailbox){
|
||
/**
|
||
* Get rid of quotes.
|
||
*/
|
||
$quotchar = substr($cidurl, 0, 1);
|
||
if ($quotchar == '"' || $quotchar == "'"){
|
||
$cidurl = str_replace($quotchar, "", $cidurl);
|
||
} else {
|
||
$quotchar = '';
|
||
}
|
||
$cidurl = substr(trim($cidurl), 4);
|
||
|
||
$match_str = '/\{.*?\}\//';
|
||
$str_rep = '';
|
||
$cidurl = preg_replace($match_str, $str_rep, $cidurl);
|
||
|
||
$linkurl = find_ent_id($cidurl, $message);
|
||
/* in case of non-safe cid links $httpurl should be replaced by a sort of
|
||
unsafe link image */
|
||
$httpurl = '';
|
||
|
||
/**
|
||
* This is part of a fix for Outlook Express 6.x generating
|
||
* cid URLs without creating content-id headers. These images are
|
||
* not part of the multipart/related html mail. The html contains
|
||
* <img src="cid:{some_id}/image_filename.ext"> references to
|
||
* attached images with as goal to render them inline although
|
||
* the attachment disposition property is not inline.
|
||
*/
|
||
|
||
if (empty($linkurl)) {
|
||
if (preg_match('/{.*}\//', $cidurl)) {
|
||
$cidurl = preg_replace('/{.*}\//','', $cidurl);
|
||
if (!empty($cidurl)) {
|
||
$linkurl = find_ent_id($cidurl, $message);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!empty($linkurl)) {
|
||
$httpurl = $quotchar . sqm_baseuri() . 'src/download.php?absolute_dl=true&' .
|
||
"passed_id=$id&mailbox=" . urlencode($mailbox) .
|
||
'&ent_id=' . $linkurl . $quotchar;
|
||
} else {
|
||
/**
|
||
* If we couldn't generate a proper img url, drop in a blank image
|
||
* instead of sending back empty, otherwise it causes unusual behaviour
|
||
*/
|
||
$httpurl = $quotchar . SM_PATH . 'images/blank.png' . $quotchar;
|
||
}
|
||
|
||
return $httpurl;
|
||
}
|
||
|
||
/**
|
||
* This function changes the <body> tag into a <div> tag since we
|
||
* can't really have a body-within-body.
|
||
*
|
||
* @param $attary an array of attributes and values of <body>
|
||
* @param $mailbox mailbox we're currently reading (for cid2http)
|
||
* @param $message current message (for cid2http)
|
||
* @param $id current message id (for cid2http)
|
||
* @return a modified array of attributes to be set for <div>
|
||
*/
|
||
function sq_body2div($attary, $mailbox, $message, $id){
|
||
$me = 'sq_body2div';
|
||
$divattary = Array('class' => "'bodyclass'");
|
||
$text = '#000000';
|
||
$has_bgc_stl = $has_txt_stl = false;
|
||
$styledef = '';
|
||
if (is_array($attary) && sizeof($attary) > 0){
|
||
foreach ($attary as $attname=>$attvalue){
|
||
$quotchar = substr($attvalue, 0, 1);
|
||
$attvalue = str_replace($quotchar, "", $attvalue);
|
||
switch ($attname){
|
||
case 'background':
|
||
$attvalue = sq_cid2http($message, $id, $attvalue, $mailbox);
|
||
$styledef .= "background-image: url('$attvalue'); ";
|
||
break;
|
||
case 'bgcolor':
|
||
$has_bgc_stl = true;
|
||
$styledef .= "background-color: $attvalue; ";
|
||
break;
|
||
case 'text':
|
||
$has_txt_stl = true;
|
||
$styledef .= "color: $attvalue; ";
|
||
break;
|
||
}
|
||
}
|
||
// Outlook defines a white bgcolor and no text color. This can lead to
|
||
// white text on a white bg with certain themes.
|
||
if ($has_bgc_stl && !$has_txt_stl) {
|
||
$styledef .= "color: $text; ";
|
||
}
|
||
if (strlen($styledef) > 0){
|
||
$divattary["style"] = "\"$styledef\"";
|
||
}
|
||
}
|
||
return $divattary;
|
||
}
|
||
|
||
/**
|
||
* This is the main function and the one you should actually be calling.
|
||
* There are several variables you should be aware of an which need
|
||
* special description.
|
||
*
|
||
* Since the description is quite lengthy, see it here:
|
||
* http://linux.duke.edu/projects/mini/htmlfilter/
|
||
*
|
||
* @param $body the string with HTML you wish to filter
|
||
* @param $tag_list see description above
|
||
* @param $rm_tags_with_content see description above
|
||
* @param $self_closing_tags see description above
|
||
* @param $force_tag_closing see description above
|
||
* @param $rm_attnames see description above
|
||
* @param $bad_attvals see description above
|
||
* @param $add_attr_to_tag see description above
|
||
* @param $message message object
|
||
* @param $id message id
|
||
* @param $recursively_called boolean flag for recursive calls into this function (optional; default FALSE)
|
||
* @return sanitized html safe to show on your pages.
|
||
*/
|
||
function sq_sanitize($body,
|
||
$tag_list,
|
||
$rm_tags_with_content,
|
||
$self_closing_tags,
|
||
$force_tag_closing,
|
||
$rm_attnames,
|
||
$bad_attvals,
|
||
$add_attr_to_tag,
|
||
$message,
|
||
$id,
|
||
$mailbox,
|
||
$recursively_called=FALSE
|
||
){
|
||
$me = 'sq_sanitize';
|
||
|
||
/**
|
||
* See if tag_list is of tags to remove or tags to allow.
|
||
* false means remove these tags
|
||
* true means allow these tags
|
||
*/
|
||
$orig_tag_list = $tag_list;
|
||
$rm_tags = array_shift($tag_list);
|
||
|
||
/**
|
||
* Normalize rm_tags and rm_tags_with_content.
|
||
*/
|
||
@array_walk($tag_list, 'sq_casenormalize');
|
||
@array_walk($rm_tags_with_content, 'sq_casenormalize');
|
||
@array_walk($self_closing_tags, 'sq_casenormalize');
|
||
|
||
$curpos = 0;
|
||
$open_tags = Array();
|
||
$trusted = "\n<!-- begin sanitized html -->\n";
|
||
$skip_content = false;
|
||
/**
|
||
* Take care of netscape's stupid javascript entities like
|
||
* &{alert('boo')};
|
||
*/
|
||
$body = preg_replace("/&(\{.*?\};)/si", "&\\1", $body);
|
||
|
||
while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
|
||
list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
|
||
|
||
/**
|
||
* RCDATA and RAWTEXT tags are handled differently:
|
||
* next instance of closing tag is used, whether or not
|
||
* the HTML is well formed before that
|
||
*/
|
||
global $rcdata_rawtext_tags;
|
||
if (!$recursively_called
|
||
&& in_array($tagname, $rcdata_rawtext_tags)
|
||
&& $tagtype === 1){
|
||
$closing_tag = false;
|
||
$closing_tag_offset = $curpos;
|
||
// seek out the closing tag for the current RCDATA/RAWTEXT tag
|
||
while (1) {
|
||
// first we need to move forward to next available closing tag
|
||
// (intentionally leave off the closing > and let sq_getnxtag() validate a proper tag syntax)
|
||
$next_tag = sq_findnxreg($body, $closing_tag_offset, "</\s*$tagname");
|
||
if ($next_tag === false) {
|
||
$closing_tag = false;
|
||
break;
|
||
}
|
||
// but then we have to make sure it's a well-formed tag
|
||
$closing_tag = sq_getnxtag($body, $next_tag[0]);
|
||
if ($closing_tag === false)
|
||
break;
|
||
else if ($closing_tag[0] !== false
|
||
// these should be redundant
|
||
&& $closing_tag[0] === $tagname && $closing_tag[2] === 2) {
|
||
$trusted .= sq_sanitize(substr($body, $curpos, $closing_tag[4] - $curpos + 1),
|
||
$orig_tag_list, $rm_tags_with_content, $self_closing_tags,
|
||
$force_tag_closing, $rm_attnames, $bad_attvals, $add_attr_to_tag,
|
||
$message, $id, $mailbox, true);
|
||
$curpos = $closing_tag[4] + 1;
|
||
continue 2;
|
||
}
|
||
$closing_tag_offset = $next_tag[0] + 1;
|
||
}
|
||
if ($closing_tag === false)
|
||
{ /* no-op... there was no closing tag for this RCDATA/RAWTEXT tag - we could probably set $curpos to the end of $body, but this HTML is malformed anyway and should just fall apart on its own */ }
|
||
}
|
||
|
||
$free_content = substr($body, $curpos, $lt-$curpos);
|
||
/**
|
||
* Take care of <style>
|
||
*/
|
||
if ($tagname == "style" && $tagtype == 1){
|
||
list($free_content, $curpos) =
|
||
sq_fixstyle($body, $gt+1, $message, $id, $mailbox);
|
||
if ($free_content != FALSE){
|
||
if ( !empty($attary) ) {
|
||
$attary = sq_fixatts($tagname,
|
||
$attary,
|
||
$rm_attnames,
|
||
$bad_attvals,
|
||
$add_attr_to_tag,
|
||
$message,
|
||
$id,
|
||
$mailbox
|
||
);
|
||
}
|
||
$trusted .= sq_tagprint($tagname, $attary, $tagtype);
|
||
$trusted .= $free_content;
|
||
$trusted .= sq_tagprint($tagname, false, 2);
|
||
}
|
||
continue;
|
||
}
|
||
if ($skip_content == false){
|
||
$trusted .= $free_content;
|
||
}
|
||
if ($tagname != FALSE){
|
||
if ($tagtype == 2){
|
||
if ($skip_content == $tagname){
|
||
/**
|
||
* Got to the end of tag we needed to remove.
|
||
*/
|
||
$tagname = false;
|
||
$skip_content = false;
|
||
} else {
|
||
if ($skip_content == false){
|
||
if ($tagname == "body"){
|
||
$tagname = "div";
|
||
}
|
||
if (isset($open_tags[$tagname]) &&
|
||
$open_tags[$tagname] > 0){
|
||
$open_tags[$tagname]--;
|
||
} else {
|
||
$tagname = false;
|
||
}
|
||
}
|
||
}
|
||
} else {
|
||
/**
|
||
* $rm_tags_with_content
|
||
*/
|
||
if ($skip_content == false){
|
||
/**
|
||
* See if this is a self-closing type and change
|
||
* tagtype appropriately.
|
||
*/
|
||
if ($tagtype == 1
|
||
&& in_array($tagname, $self_closing_tags)){
|
||
$tagtype = 3;
|
||
}
|
||
/**
|
||
* See if we should skip this tag and any content
|
||
* inside it.
|
||
*/
|
||
if ($tagtype == 1 &&
|
||
in_array($tagname, $rm_tags_with_content)){
|
||
$skip_content = $tagname;
|
||
} else {
|
||
if (($rm_tags == false
|
||
&& in_array($tagname, $tag_list)) ||
|
||
($rm_tags == true &&
|
||
!in_array($tagname, $tag_list))){
|
||
$tagname = false;
|
||
} else {
|
||
/**
|
||
* Convert body into div.
|
||
*/
|
||
if ($tagname == "body"){
|
||
$tagname = "div";
|
||
$attary = sq_body2div($attary, $mailbox,
|
||
$message, $id);
|
||
}
|
||
if ($tagtype == 1){
|
||
if (isset($open_tags[$tagname])){
|
||
$open_tags[$tagname]++;
|
||
} else {
|
||
$open_tags[$tagname]=1;
|
||
}
|
||
}
|
||
/**
|
||
* This is where we run other checks.
|
||
*/
|
||
if (is_array($attary) && sizeof($attary) > 0){
|
||
$attary = sq_fixatts($tagname,
|
||
$attary,
|
||
$rm_attnames,
|
||
$bad_attvals,
|
||
$add_attr_to_tag,
|
||
$message,
|
||
$id,
|
||
$mailbox
|
||
);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
if ($tagname != false && $skip_content == false){
|
||
$trusted .= sq_tagprint($tagname, $attary, $tagtype);
|
||
}
|
||
}
|
||
$curpos = $gt+1;
|
||
}
|
||
$trusted .= substr($body, $curpos, strlen($body)-$curpos);
|
||
if ($force_tag_closing == true){
|
||
foreach ($open_tags as $tagname=>$opentimes){
|
||
while ($opentimes > 0){
|
||
$trusted .= '</' . $tagname . '>';
|
||
$opentimes--;
|
||
}
|
||
}
|
||
$trusted .= "\n";
|
||
}
|
||
$trusted .= "<!-- end sanitized html -->\n";
|
||
return $trusted;
|
||
}
|
||
|
||
/**
|
||
* This is a wrapper function to call html sanitizing routines.
|
||
*
|
||
* @param $body the body of the message
|
||
* @param $id the id of the message
|
||
|
||
* @param $message
|
||
* @param $mailbox
|
||
* @param boolean $take_mailto_links When TRUE, converts mailto: links
|
||
* into internal SM compose links
|
||
* (optional; default = TRUE)
|
||
* @return a string with html safe to display in the browser.
|
||
*/
|
||
function magicHTML($body, $id, $message, $mailbox = 'INBOX', $take_mailto_links =true) {
|
||
|
||
// require_once(SM_PATH . 'functions/url_parser.php'); // for $MailTo_PReg_Match
|
||
|
||
global $attachment_common_show_images, $view_unsafe_images,
|
||
$has_unsafe_images, $allow_svg_display, $rcdata_rawtext_tags,
|
||
$remove_rcdata_rawtext_tags_and_content;
|
||
|
||
$rcdata_rawtext_tags = array(
|
||
"noscript",
|
||
"noframes",
|
||
"noembed",
|
||
"textarea",
|
||
// also "title", "xmp", "script", "iframe", "plaintext" which we already remove below
|
||
);
|
||
|
||
/**
|
||
* Don't display attached images in HTML mode.
|
||
*
|
||
* SB: why?
|
||
*/
|
||
$attachment_common_show_images = false;
|
||
$tag_list = Array(
|
||
false, // remove these tags
|
||
"meta",
|
||
"html",
|
||
"head",
|
||
"base",
|
||
"link",
|
||
"frame",
|
||
"iframe",
|
||
"plaintext",
|
||
"marquee",
|
||
);
|
||
|
||
$rm_tags_with_content = Array(
|
||
"script",
|
||
"object",
|
||
"applet",
|
||
"embed",
|
||
"title",
|
||
"frameset",
|
||
"xmp",
|
||
"xml",
|
||
);
|
||
if (!$allow_svg_display)
|
||
$rm_tags_with_content[] = 'svg';
|
||
/**
|
||
* SquirrelMail will parse RCDATA and RAWTEXT tags and handle them as the special
|
||
* case that they are, but if you prefer to remove them and their contents entirely
|
||
* (in most cases, should be a safe thing with minimal impact), you can add the
|
||
* following to config/config_local.php
|
||
* $remove_rcdata_rawtext_tags_and_content = TRUE;
|
||
*/
|
||
if ($remove_rcdata_rawtext_tags_and_content)
|
||
$rm_tags_with_content = array_merge($rm_tags_with_content, $rcdata_rawtext_tags);
|
||
|
||
$self_closing_tags = Array(
|
||
"img",
|
||
"br",
|
||
"hr",
|
||
"input",
|
||
"outbind",
|
||
);
|
||
|
||
$force_tag_closing = true;
|
||
|
||
$rm_attnames = Array(
|
||
"/.*/" =>
|
||
Array(
|
||
"/target/i",
|
||
"/^on.*/i",
|
||
"/^dynsrc/i",
|
||
"/^data.*/i",
|
||
"/^lowsrc.*/i",
|
||
)
|
||
);
|
||
|
||
global $use_transparent_security_image;
|
||
if ($use_transparent_security_image) $secremoveimg = '../images/spacer.png';
|
||
else $secremoveimg = '../images/' . _("sec_remove_eng.png");
|
||
|
||
$bad_attvals = Array(
|
||
"/.*/" =>
|
||
Array(
|
||
"/^src|background/i" =>
|
||
Array(
|
||
Array(
|
||
"/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
|
||
"/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
|
||
"/^([\'\"])\s*about\s*:.*([\'\"])/si"
|
||
),
|
||
Array(
|
||
"\\1$secremoveimg\\2",
|
||
"\\1$secremoveimg\\2",
|
||
"\\1$secremoveimg\\2",
|
||
)
|
||
),
|
||
"/^href|action/i" =>
|
||
Array(
|
||
Array(
|
||
"/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
|
||
"/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
|
||
"/^([\'\"])\s*about\s*:.*([\'\"])/si"
|
||
),
|
||
Array(
|
||
"\\1#\\1",
|
||
"\\1#\\1",
|
||
"\\1#\\1"
|
||
)
|
||
),
|
||
"/^style/i" =>
|
||
Array(
|
||
Array(
|
||
"/\/\*.*\*\//",
|
||
"/expression/i",
|
||
"/binding/i",
|
||
"/behaviou*r/i",
|
||
"/include-source/i",
|
||
|
||
// position:relative can also be exploited
|
||
// to put content outside of email body area
|
||
// and position:fixed is similarly exploitable
|
||
// as position:absolute, so we'll remove it
|
||
// altogether....
|
||
//
|
||
// Does this screw up legitimate HTML messages?
|
||
// If so, the only fix I see is to allow position
|
||
// attributes (any values? I think we still have
|
||
// to block static and fixed) only if $use_iframe
|
||
// is enabled (1.5.0+)
|
||
//
|
||
// was: "/position\s*:\s*absolute/i",
|
||
//
|
||
"/position\s*:/i",
|
||
|
||
"/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i",
|
||
"/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
|
||
"/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
|
||
"/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
|
||
"/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
|
||
),
|
||
Array(
|
||
"",
|
||
"idiocy",
|
||
"idiocy",
|
||
"idiocy",
|
||
"idiocy",
|
||
"idiocy",
|
||
"url",
|
||
"url(\\1#\\1)",
|
||
"url(\\1#\\1)",
|
||
"url(\\1#\\1)",
|
||
"\\1:url(\\2#\\3)"
|
||
)
|
||
)
|
||
)
|
||
);
|
||
|
||
// If there's no "view_unsafe_images" variable in the URL, turn unsafe
|
||
// images off by default.
|
||
sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET, FALSE);
|
||
|
||
if (!$view_unsafe_images){
|
||
/**
|
||
* Remove any references to http/https if view_unsafe_images set
|
||
* to false.
|
||
*/
|
||
array_push($bad_attvals['/.*/']['/^src|background/i'][0],
|
||
'/^([\'\"])\s*https*:.*([\'\"])/si');
|
||
array_push($bad_attvals['/.*/']['/^src|background/i'][1],
|
||
"\\1$secremoveimg\\1");
|
||
array_push($bad_attvals['/.*/']['/^style/i'][0],
|
||
'/url\([\'\"]?https?:[^\)]*[\'\"]?\)/si');
|
||
array_push($bad_attvals['/.*/']['/^style/i'][1],
|
||
"url(\\1$secremoveimg\\1)");
|
||
}
|
||
|
||
$add_attr_to_tag = Array(
|
||
"/^a$/i" =>
|
||
Array('target'=>'"_blank"',
|
||
'title'=>'"'._("This external link will open in a new window").'"'
|
||
)
|
||
);
|
||
$trusted = sq_sanitize($body,
|
||
$tag_list,
|
||
$rm_tags_with_content,
|
||
$self_closing_tags,
|
||
$force_tag_closing,
|
||
$rm_attnames,
|
||
$bad_attvals,
|
||
$add_attr_to_tag,
|
||
$message,
|
||
$id,
|
||
$mailbox
|
||
);
|
||
if (strpos($trusted,$secremoveimg)){
|
||
$has_unsafe_images = true;
|
||
}
|
||
|
||
// we want to parse mailto's in HTML output, change to SM compose links
|
||
// this is a modified version of code from url_parser.php... but Marc is
|
||
// right: we need a better filtering implementation; adding this randomly
|
||
// here is not a great solution
|
||
//
|
||
if ($take_mailto_links) {
|
||
// parseUrl($trusted); // this even parses URLs inside of tags... too aggressive
|
||
global $MailTo_PReg_Match;
|
||
// some mailers (Microsoft, surprise surprise) produce mailto strings without being
|
||
// inside an anchor (link) tag, so we have to make sure the regex looks for the
|
||
// quote before mailto, and we'll also try to convert the non-links back into links
|
||
$MailTo_PReg_Match = '/([\'"])?mailto:' . substr($MailTo_PReg_Match, 1) ;
|
||
if ((preg_match_all($MailTo_PReg_Match, $trusted, $regs)) && ($regs[0][0] != '')) {
|
||
foreach ($regs[0] as $i => $mailto_before) {
|
||
$mailto_params = $regs[11][$i];
|
||
|
||
// get rid of any leading quote we may have captured but don't care about
|
||
//
|
||
$mailto_before = ltrim($mailto_before, '"\'');
|
||
|
||
// get rid of any tailing quote since we have to add send_to to the end
|
||
//
|
||
$mailto_before = rtrim($mailto_before, '"\'');
|
||
$mailto_params = rtrim($mailto_params, '"\'');
|
||
|
||
if ($regs[2][$i]) { //if there is an email addr before '?', we need to merge it with the params
|
||
$to = 'to=' . $regs[2][$i];
|
||
if (strpos($mailto_params, 'to=') > -1) //already a 'to='
|
||
$mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
|
||
else {
|
||
if ($mailto_params) //already some params, append to them
|
||
$mailto_params .= '&' . $to;
|
||
else
|
||
$mailto_params .= '?' . $to;
|
||
}
|
||
}
|
||
|
||
$url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
|
||
|
||
// we'll already have target=_blank, no need to allow comp_in_new
|
||
// here (which would be a lot more work anyway)
|
||
//
|
||
global $compose_new_win;
|
||
$temp_comp_in_new = $compose_new_win;
|
||
$compose_new_win = 0;
|
||
$comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
|
||
$compose_new_win = $temp_comp_in_new;
|
||
|
||
// remove <a href=" and anything after the next quote (we only
|
||
// need the uri, not the link HTML) in compose uri
|
||
//
|
||
// but only do this if the original mailto was in a real anchor tag
|
||
//
|
||
if (!empty($regs[1][$i])) {
|
||
$comp_uri = substr($comp_uri, 9);
|
||
$comp_uri = substr($comp_uri, 0, strpos($comp_uri, '"', 1));
|
||
}
|
||
$trusted = str_replace($mailto_before, $comp_uri, $trusted);
|
||
}
|
||
}
|
||
}
|
||
|
||
return $trusted;
|
||
}
|
||
|
||
/**
|
||
* function SendDownloadHeaders - send file to the browser
|
||
*
|
||
* Original Source: SM core src/download.php
|
||
* moved here to make it available to other code, and separate
|
||
* front end from back end functionality.
|
||
*
|
||
* @param string $type0 first half of mime type
|
||
* @param string $type1 second half of mime type
|
||
* @param string $filename filename to tell the browser for downloaded file
|
||
* @param boolean $force whether to force the download dialog to pop
|
||
* @param optional integer $filesize send the Content-Header and length to the browser
|
||
* @return void
|
||
*/
|
||
function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
|
||
global $languages, $squirrelmail_language;
|
||
$isIE = $isIE6plus = false;
|
||
|
||
sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER);
|
||
|
||
if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
|
||
strstr($HTTP_USER_AGENT, 'Opera') === false) {
|
||
$isIE = true;
|
||
}
|
||
|
||
if (preg_match('/compatible; MSIE ([0-9]+)/', $HTTP_USER_AGENT, $match) &&
|
||
((int)$match[1]) >= 6 && strstr($HTTP_USER_AGENT, 'Opera') === false) {
|
||
$isIE6plus = true;
|
||
}
|
||
|
||
if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
|
||
function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
|
||
$filename =
|
||
call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
|
||
} else {
|
||
$filename = preg_replace('/[\\\\\/:*?"<>|;]/', '_', str_replace(' ', ' ', $filename));
|
||
}
|
||
|
||
// A Pox on Microsoft and it's Internet Explorer!
|
||
//
|
||
// IE has lots of bugs with file downloads.
|
||
// It also has problems with SSL. Both of these cause problems
|
||
// for us in this function.
|
||
//
|
||
// See this article on Cache Control headers and SSL
|
||
// http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
|
||
//
|
||
// The best thing you can do for IE is to upgrade to the latest
|
||
// version
|
||
//set all the Cache Control Headers for IE
|
||
if ($isIE) {
|
||
$filename=rawurlencode($filename);
|
||
header ("Pragma: public");
|
||
header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); // HTTP/1.1
|
||
// does nothing - see: https://blogs.msdn.microsoft.com/ieinternals/2009/07/20/internet-explorers-cache-control-extensions/
|
||
// header ("Cache-Control: post-check=0, pre-check=0", false);
|
||
header ("Cache-Control: private");
|
||
|
||
//set the inline header for IE, we'll add the attachment header later if we need it
|
||
header ("Content-Disposition: inline; filename=$filename");
|
||
}
|
||
|
||
if (!$force) {
|
||
// Try to show in browser window
|
||
header ("Content-Disposition: inline; filename=\"$filename\"");
|
||
header ("Content-Type: $type0/$type1; name=\"$filename\"");
|
||
} else {
|
||
// Try to pop up the "save as" box
|
||
|
||
// IE makes this hard. It pops up 2 save boxes, or none.
|
||
// http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
|
||
// http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
|
||
// But, according to Microsoft, it is "RFC compliant but doesn't
|
||
// take into account some deviations that allowed within the
|
||
// specification." Doesn't that mean RFC non-compliant?
|
||
// http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
|
||
|
||
// all browsers need the application/octet-stream header for this
|
||
header ("Content-Type: application/octet-stream; name=\"$filename\"");
|
||
|
||
// http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
|
||
// Do not have quotes around filename, but that applied to
|
||
// "attachment"... does it apply to inline too?
|
||
header ("Content-Disposition: attachment; filename=\"$filename\"");
|
||
|
||
if ($isIE && !$isIE6plus) {
|
||
// This combination seems to work mostly. IE 5.5 SP 1 has
|
||
// known issues (see the Microsoft Knowledge Base)
|
||
|
||
// This works for most types, but doesn't work with Word files
|
||
header ("Content-Type: application/download; name=\"$filename\"");
|
||
header ("Content-Type: application/force-download; name=\"$filename\"");
|
||
// These are spares, just in case. :-)
|
||
//header("Content-Type: $type0/$type1; name=\"$filename\"");
|
||
//header("Content-Type: application/x-msdownload; name=\"$filename\"");
|
||
//header("Content-Type: application/octet-stream; name=\"$filename\"");
|
||
} else if ($isIE) {
|
||
// This is to prevent IE for MIME sniffing and auto open a file in IE
|
||
header ("Content-Type: application/force-download; name=\"$filename\"");
|
||
} else {
|
||
// another application/octet-stream forces download for Netscape
|
||
header ("Content-Type: application/octet-stream; name=\"$filename\"");
|
||
}
|
||
}
|
||
|
||
//send the content-length header if the calling function provides it
|
||
if ($filesize > 0) {
|
||
header("Content-Length: $filesize");
|
||
}
|
||
|
||
} // end fn SendDownloadHeaders
|