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Manuela
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<?php
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/**
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* htmlfilter.inc
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* ---------------
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* This set of functions allows you to filter html in order to remove
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* any malicious tags from it. Useful in cases when you need to filter
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* user input for any cross-site-scripting attempts.
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*
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* Copyright (C) 2002-2004 by Duke University
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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* @Author Konstantin Riabitsev <icon@linux.duke.edu>
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* @Author Jim Jagielski <jim@jaguNET.com / jimjag@gmail.com>
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* @Version 1.1 ($Date$)
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*/
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/**
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* This function returns the final tag out of the tag name, an array
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* of attributes, and the type of the tag. This function is called by
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* tln_sanitize internally.
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*
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* @param string $tagname the name of the tag.
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* @param array $attary the array of attributes and their values
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* @param integer $tagtype The type of the tag (see in comments).
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* @return string A string with the final tag representation.
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*/
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function tln_tagprint($tagname, $attary, $tagtype)
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{
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if ($tagtype == 2) {
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$fulltag = '</' . $tagname . '>';
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} else {
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$fulltag = '<' . $tagname;
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if (is_array($attary) && sizeof($attary)) {
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$atts = array();
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while (list($attname, $attvalue) = each($attary)) {
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array_push($atts, "$attname=$attvalue");
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}
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$fulltag .= ' ' . join(' ', $atts);
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}
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if ($tagtype == 3) {
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$fulltag .= ' /';
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}
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$fulltag .= '>';
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}
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return $fulltag;
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}
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/**
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* A small helper function to use with array_walk. Modifies a by-ref
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* value and makes it lowercase.
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*
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* @param string $val a value passed by-ref.
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* @return void since it modifies a by-ref value.
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*/
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function tln_casenormalize(&$val)
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{
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$val = strtolower($val);
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}
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/**
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* This function skips any whitespace from the current position within
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* a string and to the next non-whitespace value.
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*
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* @param string $body the string
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* @param integer $offset the offset within the string where we should start
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* looking for the next non-whitespace character.
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* @return integer the location within the $body where the next
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* non-whitespace char is located.
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*/
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function tln_skipspace($body, $offset)
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{
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preg_match('/^(\s*)/s', substr($body, $offset), $matches);
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if (sizeof($matches[1])) {
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$count = strlen($matches[1]);
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$offset += $count;
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}
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return $offset;
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}
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/**
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* This function looks for the next character within a string. It's
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* really just a glorified "strpos", except it catches the failures
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* nicely.
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*
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* @param string $body The string to look for needle in.
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* @param integer $offset Start looking from this position.
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* @param string $needle The character/string to look for.
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* @return integer location of the next occurrence of the needle, or
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* strlen($body) if needle wasn't found.
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*/
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function tln_findnxstr($body, $offset, $needle)
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{
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$pos = strpos($body, $needle, $offset);
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if ($pos === false) {
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$pos = strlen($body);
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}
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return $pos;
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}
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/**
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* This function takes a PCRE-style regexp and tries to match it
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* within the string.
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*
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* @param string $body The string to look for needle in.
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* @param integer $offset Start looking from here.
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* @param string $reg A PCRE-style regex to match.
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* @return array|boolean Returns a false if no matches found, or an array
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* with the following members:
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* - integer with the location of the match within $body
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* - string with whatever content between offset and the match
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* - string with whatever it is we matched
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*/
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function tln_findnxreg($body, $offset, $reg)
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{
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$matches = array();
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$retarr = array();
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$preg_rule = '%^(.*?)(' . $reg . ')%s';
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preg_match($preg_rule, substr($body, $offset), $matches);
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if (!isset($matches[0]) || !$matches[0]) {
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$retarr = false;
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} else {
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$retarr[0] = $offset + strlen($matches[1]);
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$retarr[1] = $matches[1];
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$retarr[2] = $matches[2];
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}
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return $retarr;
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}
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/**
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* This function looks for the next tag.
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*
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* @param string $body String where to look for the next tag.
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* @param integer $offset Start looking from here.
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* @return array|boolean false if no more tags exist in the body, or
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* an array with the following members:
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* - string with the name of the tag
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* - array with attributes and their values
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* - integer with tag type (1, 2, or 3)
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* - integer where the tag starts (starting "<")
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* - integer where the tag ends (ending ">")
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* first three members will be false, if the tag is invalid.
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*/
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function tln_getnxtag($body, $offset)
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{
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if ($offset > strlen($body)) {
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return false;
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}
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$lt = tln_findnxstr($body, $offset, '<');
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if ($lt == strlen($body)) {
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return false;
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}
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/**
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* We are here:
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* blah blah <tag attribute="value">
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* \---------^
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*/
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$pos = tln_skipspace($body, $lt + 1);
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if ($pos >= strlen($body)) {
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return array(false, false, false, $lt, strlen($body));
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}
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/**
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* There are 3 kinds of tags:
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* 1. Opening tag, e.g.:
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* <a href="blah">
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* 2. Closing tag, e.g.:
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* </a>
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* 3. XHTML-style content-less tag, e.g.:
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* <img src="blah"/>
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*/
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switch (substr($body, $pos, 1)) {
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case '/':
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$tagtype = 2;
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$pos++;
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break;
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case '!':
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/**
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* A comment or an SGML declaration.
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*/
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if (substr($body, $pos + 1, 2) == '--') {
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$gt = strpos($body, '-->', $pos);
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if ($gt === false) {
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$gt = strlen($body);
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} else {
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$gt += 2;
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}
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return array(false, false, false, $lt, $gt);
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} else {
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$gt = tln_findnxstr($body, $pos, '>');
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return array(false, false, false, $lt, $gt);
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}
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break;
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default:
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/**
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* Assume tagtype 1 for now. If it's type 3, we'll switch values
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* later.
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*/
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211 |
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$tagtype = 1;
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break;
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}
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/**
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* Look for next [\W-_], which will indicate the end of the tag name.
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*/
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$regary = tln_findnxreg($body, $pos, '[^\w\-_]');
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219 |
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if ($regary == false) {
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return array(false, false, false, $lt, strlen($body));
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}
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list($pos, $tagname, $match) = $regary;
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$tagname = strtolower($tagname);
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/**
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* $match can be either of these:
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* '>' indicating the end of the tag entirely.
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* '\s' indicating the end of the tag name.
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229 |
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* '/' indicating that this is type-3 xhtml tag.
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*
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* Whatever else we find there indicates an invalid tag.
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*/
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switch ($match) {
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case '/':
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/**
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* This is an xhtml-style tag with a closing / at the
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* end, like so: <img src="blah"/>. Check if it's followed
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* by the closing bracket. If not, then this tag is invalid
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239 |
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*/
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240 |
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if (substr($body, $pos, 2) == '/>') {
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241 |
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$pos++;
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242 |
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$tagtype = 3;
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} else {
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$gt = tln_findnxstr($body, $pos, '>');
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$retary = array(false, false, false, $lt, $gt);
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return $retary;
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}
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//intentional fall-through
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case '>':
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250 |
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return array($tagname, false, $tagtype, $lt, $pos);
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break;
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252 |
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default:
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/**
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* Check if it's whitespace
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255 |
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*/
|
256 |
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if (!preg_match('/\s/', $match)) {
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257 |
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/**
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258 |
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* This is an invalid tag! Look for the next closing ">".
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259 |
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*/
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260 |
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$gt = tln_findnxstr($body, $lt, '>');
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return array(false, false, false, $lt, $gt);
|
262 |
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}
|
263 |
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break;
|
264 |
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}
|
265 |
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|
266 |
|
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/**
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267 |
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* At this point we're here:
|
268 |
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* <tagname attribute='blah'>
|
269 |
|
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* \-------^
|
270 |
|
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*
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271 |
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* At this point we loop in order to find all attributes.
|
272 |
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*/
|
273 |
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$attary = array();
|
274 |
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|
275 |
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while ($pos <= strlen($body)) {
|
276 |
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$pos = tln_skipspace($body, $pos);
|
277 |
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if ($pos == strlen($body)) {
|
278 |
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/**
|
279 |
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* Non-closed tag.
|
280 |
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*/
|
281 |
|
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return array(false, false, false, $lt, $pos);
|
282 |
|
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}
|
283 |
|
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/**
|
284 |
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* See if we arrived at a ">" or "/>", which means that we reached
|
285 |
|
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* the end of the tag.
|
286 |
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*/
|
287 |
|
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$matches = array();
|
288 |
|
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if (preg_match('%^(\s*)(>|/>)%s', substr($body, $pos), $matches)) {
|
289 |
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/**
|
290 |
|
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* Yep. So we did.
|
291 |
|
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*/
|
292 |
|
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$pos += strlen($matches[1]);
|
293 |
|
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if ($matches[2] == '/>') {
|
294 |
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$tagtype = 3;
|
295 |
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$pos++;
|
296 |
|
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}
|
297 |
|
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return array($tagname, $attary, $tagtype, $lt, $pos);
|
298 |
|
|
}
|
299 |
|
|
|
300 |
|
|
/**
|
301 |
|
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* There are several types of attributes, with optional
|
302 |
|
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* [:space:] between members.
|
303 |
|
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* Type 1:
|
304 |
|
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* attrname[:space:]=[:space:]'CDATA'
|
305 |
|
|
* Type 2:
|
306 |
|
|
* attrname[:space:]=[:space:]"CDATA"
|
307 |
|
|
* Type 3:
|
308 |
|
|
* attr[:space:]=[:space:]CDATA
|
309 |
|
|
* Type 4:
|
310 |
|
|
* attrname
|
311 |
|
|
*
|
312 |
|
|
* We leave types 1 and 2 the same, type 3 we check for
|
313 |
|
|
* '"' and convert to """ if needed, then wrap in
|
314 |
|
|
* double quotes. Type 4 we convert into:
|
315 |
|
|
* attrname="yes".
|
316 |
|
|
*/
|
317 |
|
|
$regary = tln_findnxreg($body, $pos, '[^\w\-_]');
|
318 |
|
|
if ($regary == false) {
|
319 |
|
|
/**
|
320 |
|
|
* Looks like body ended before the end of tag.
|
321 |
|
|
*/
|
322 |
|
|
return array(false, false, false, $lt, strlen($body));
|
323 |
|
|
}
|
324 |
|
|
list($pos, $attname, $match) = $regary;
|
325 |
|
|
$attname = strtolower($attname);
|
326 |
|
|
/**
|
327 |
|
|
* We arrived at the end of attribute name. Several things possible
|
328 |
|
|
* here:
|
329 |
|
|
* '>' means the end of the tag and this is attribute type 4
|
330 |
|
|
* '/' if followed by '>' means the same thing as above
|
331 |
|
|
* '\s' means a lot of things -- look what it's followed by.
|
332 |
|
|
* anything else means the attribute is invalid.
|
333 |
|
|
*/
|
334 |
|
|
switch ($match) {
|
335 |
|
|
case '/':
|
336 |
|
|
/**
|
337 |
|
|
* This is an xhtml-style tag with a closing / at the
|
338 |
|
|
* end, like so: <img src="blah"/>. Check if it's followed
|
339 |
|
|
* by the closing bracket. If not, then this tag is invalid
|
340 |
|
|
*/
|
341 |
|
|
if (substr($body, $pos, 2) == '/>') {
|
342 |
|
|
$pos++;
|
343 |
|
|
$tagtype = 3;
|
344 |
|
|
} else {
|
345 |
|
|
$gt = tln_findnxstr($body, $pos, '>');
|
346 |
|
|
$retary = array(false, false, false, $lt, $gt);
|
347 |
|
|
return $retary;
|
348 |
|
|
}
|
349 |
|
|
//intentional fall-through
|
350 |
|
|
case '>':
|
351 |
|
|
$attary{$attname} = '"yes"';
|
352 |
|
|
return array($tagname, $attary, $tagtype, $lt, $pos);
|
353 |
|
|
break;
|
354 |
|
|
default:
|
355 |
|
|
/**
|
356 |
|
|
* Skip whitespace and see what we arrive at.
|
357 |
|
|
*/
|
358 |
|
|
$pos = tln_skipspace($body, $pos);
|
359 |
|
|
$char = substr($body, $pos, 1);
|
360 |
|
|
/**
|
361 |
|
|
* Two things are valid here:
|
362 |
|
|
* '=' means this is attribute type 1 2 or 3.
|
363 |
|
|
* \w means this was attribute type 4.
|
364 |
|
|
* anything else we ignore and re-loop. End of tag and
|
365 |
|
|
* invalid stuff will be caught by our checks at the beginning
|
366 |
|
|
* of the loop.
|
367 |
|
|
*/
|
368 |
|
|
if ($char == '=') {
|
369 |
|
|
$pos++;
|
370 |
|
|
$pos = tln_skipspace($body, $pos);
|
371 |
|
|
/**
|
372 |
|
|
* Here are 3 possibilities:
|
373 |
|
|
* "'" attribute type 1
|
374 |
|
|
* '"' attribute type 2
|
375 |
|
|
* everything else is the content of tag type 3
|
376 |
|
|
*/
|
377 |
|
|
$quot = substr($body, $pos, 1);
|
378 |
|
|
if ($quot == '\'') {
|
379 |
|
|
$regary = tln_findnxreg($body, $pos + 1, '\'');
|
380 |
|
|
if ($regary == false) {
|
381 |
|
|
return array(false, false, false, $lt, strlen($body));
|
382 |
|
|
}
|
383 |
|
|
list($pos, $attval, $match) = $regary;
|
384 |
|
|
$pos++;
|
385 |
|
|
$attary{$attname} = '\'' . $attval . '\'';
|
386 |
|
|
} elseif ($quot == '"') {
|
387 |
|
|
$regary = tln_findnxreg($body, $pos + 1, '\"');
|
388 |
|
|
if ($regary == false) {
|
389 |
|
|
return array(false, false, false, $lt, strlen($body));
|
390 |
|
|
}
|
391 |
|
|
list($pos, $attval, $match) = $regary;
|
392 |
|
|
$pos++;
|
393 |
|
|
$attary{$attname} = '"' . $attval . '"';
|
394 |
|
|
} else {
|
395 |
|
|
/**
|
396 |
|
|
* These are hateful. Look for \s, or >.
|
397 |
|
|
*/
|
398 |
|
|
$regary = tln_findnxreg($body, $pos, '[\s>]');
|
399 |
|
|
if ($regary == false) {
|
400 |
|
|
return array(false, false, false, $lt, strlen($body));
|
401 |
|
|
}
|
402 |
|
|
list($pos, $attval, $match) = $regary;
|
403 |
|
|
/**
|
404 |
|
|
* If it's ">" it will be caught at the top.
|
405 |
|
|
*/
|
406 |
|
|
$attval = preg_replace('/\"/s', '"', $attval);
|
407 |
|
|
$attary{$attname} = '"' . $attval . '"';
|
408 |
|
|
}
|
409 |
|
|
} elseif (preg_match('|[\w/>]|', $char)) {
|
410 |
|
|
/**
|
411 |
|
|
* That was attribute type 4.
|
412 |
|
|
*/
|
413 |
|
|
$attary{$attname} = '"yes"';
|
414 |
|
|
} else {
|
415 |
|
|
/**
|
416 |
|
|
* An illegal character. Find next '>' and return.
|
417 |
|
|
*/
|
418 |
|
|
$gt = tln_findnxstr($body, $pos, '>');
|
419 |
|
|
return array(false, false, false, $lt, $gt);
|
420 |
|
|
}
|
421 |
|
|
break;
|
422 |
|
|
}
|
423 |
|
|
}
|
424 |
|
|
/**
|
425 |
|
|
* The fact that we got here indicates that the tag end was never
|
426 |
|
|
* found. Return invalid tag indication so it gets stripped.
|
427 |
|
|
*/
|
428 |
|
|
return array(false, false, false, $lt, strlen($body));
|
429 |
|
|
}
|
430 |
|
|
|
431 |
|
|
/**
|
432 |
|
|
* Translates entities into literal values so they can be checked.
|
433 |
|
|
*
|
434 |
|
|
* @param string $attvalue the by-ref value to check.
|
435 |
|
|
* @param string $regex the regular expression to check against.
|
436 |
|
|
* @param boolean $hex whether the entites are hexadecimal.
|
437 |
|
|
* @return boolean True or False depending on whether there were matches.
|
438 |
|
|
*/
|
439 |
|
|
function tln_deent(&$attvalue, $regex, $hex = false)
|
440 |
|
|
{
|
441 |
|
|
preg_match_all($regex, $attvalue, $matches);
|
442 |
|
|
if (is_array($matches) && sizeof($matches[0]) > 0) {
|
443 |
|
|
$repl = array();
|
444 |
|
|
for ($i = 0; $i < sizeof($matches[0]); $i++) {
|
445 |
|
|
$numval = $matches[1][$i];
|
446 |
|
|
if ($hex) {
|
447 |
|
|
$numval = hexdec($numval);
|
448 |
|
|
}
|
449 |
|
|
$repl{$matches[0][$i]} = chr($numval);
|
450 |
|
|
}
|
451 |
|
|
$attvalue = strtr($attvalue, $repl);
|
452 |
|
|
return true;
|
453 |
|
|
} else {
|
454 |
|
|
return false;
|
455 |
|
|
}
|
456 |
|
|
}
|
457 |
|
|
|
458 |
|
|
/**
|
459 |
|
|
* This function checks attribute values for entity-encoded values
|
460 |
|
|
* and returns them translated into 8-bit strings so we can run
|
461 |
|
|
* checks on them.
|
462 |
|
|
*
|
463 |
|
|
* @param string $attvalue A string to run entity check against.
|
464 |
|
|
*/
|
465 |
|
|
function tln_defang(&$attvalue)
|
466 |
|
|
{
|
467 |
|
|
/**
|
468 |
|
|
* Skip this if there aren't ampersands or backslashes.
|
469 |
|
|
*/
|
470 |
|
|
if (strpos($attvalue, '&') === false
|
471 |
|
|
&& strpos($attvalue, '\\') === false
|
472 |
|
|
) {
|
473 |
|
|
return;
|
474 |
|
|
}
|
475 |
|
|
do {
|
476 |
|
|
$m = false;
|
477 |
|
|
$m = $m || tln_deent($attvalue, '/\�*(\d+);*/s');
|
478 |
|
|
$m = $m || tln_deent($attvalue, '/\�*((\d|[a-f])+);*/si', true);
|
479 |
|
|
$m = $m || tln_deent($attvalue, '/\\\\(\d+)/s', true);
|
480 |
|
|
} while ($m == true);
|
481 |
|
|
$attvalue = stripslashes($attvalue);
|
482 |
|
|
}
|
483 |
|
|
|
484 |
|
|
/**
|
485 |
|
|
* Kill any tabs, newlines, or carriage returns. Our friends the
|
486 |
|
|
* makers of the browser with 95% market value decided that it'd
|
487 |
|
|
* be funny to make "java[tab]script" be just as good as "javascript".
|
488 |
|
|
*
|
489 |
|
|
* @param string $attvalue The attribute value before extraneous spaces removed.
|
490 |
|
|
*/
|
491 |
|
|
function tln_unspace(&$attvalue)
|
492 |
|
|
{
|
493 |
|
|
if (strcspn($attvalue, "\t\r\n\0 ") != strlen($attvalue)) {
|
494 |
|
|
$attvalue = str_replace(
|
495 |
|
|
array("\t", "\r", "\n", "\0", " "),
|
496 |
|
|
array('', '', '', '', ''),
|
497 |
|
|
$attvalue
|
498 |
|
|
);
|
499 |
|
|
}
|
500 |
|
|
}
|
501 |
|
|
|
502 |
|
|
/**
|
503 |
|
|
* This function runs various checks against the attributes.
|
504 |
|
|
*
|
505 |
|
|
* @param string $tagname String with the name of the tag.
|
506 |
|
|
* @param array $attary Array with all tag attributes.
|
507 |
|
|
* @param array $rm_attnames See description for tln_sanitize
|
508 |
|
|
* @param array $bad_attvals See description for tln_sanitize
|
509 |
|
|
* @param array $add_attr_to_tag See description for tln_sanitize
|
510 |
|
|
* @param string $trans_image_path
|
511 |
|
|
* @param boolean $block_external_images
|
512 |
|
|
* @return array with modified attributes.
|
513 |
|
|
*/
|
514 |
|
|
function tln_fixatts(
|
515 |
|
|
$tagname,
|
516 |
|
|
$attary,
|
517 |
|
|
$rm_attnames,
|
518 |
|
|
$bad_attvals,
|
519 |
|
|
$add_attr_to_tag,
|
520 |
|
|
$trans_image_path,
|
521 |
|
|
$block_external_images
|
522 |
|
|
) {
|
523 |
|
|
while (list($attname, $attvalue) = each($attary)) {
|
524 |
|
|
/**
|
525 |
|
|
* See if this attribute should be removed.
|
526 |
|
|
*/
|
527 |
|
|
foreach ($rm_attnames as $matchtag => $matchattrs) {
|
528 |
|
|
if (preg_match($matchtag, $tagname)) {
|
529 |
|
|
foreach ($matchattrs as $matchattr) {
|
530 |
|
|
if (preg_match($matchattr, $attname)) {
|
531 |
|
|
unset($attary{$attname});
|
532 |
|
|
continue;
|
533 |
|
|
}
|
534 |
|
|
}
|
535 |
|
|
}
|
536 |
|
|
}
|
537 |
|
|
/**
|
538 |
|
|
* Remove any backslashes, entities, or extraneous whitespace.
|
539 |
|
|
*/
|
540 |
|
|
$oldattvalue = $attvalue;
|
541 |
|
|
tln_defang($attvalue);
|
542 |
|
|
if ($attname == 'style' && $attvalue !== $oldattvalue) {
|
543 |
|
|
$attvalue = "idiocy";
|
544 |
|
|
$attary{$attname} = $attvalue;
|
545 |
|
|
}
|
546 |
|
|
tln_unspace($attvalue);
|
547 |
|
|
|
548 |
|
|
/**
|
549 |
|
|
* Now let's run checks on the attvalues.
|
550 |
|
|
* I don't expect anyone to comprehend this. If you do,
|
551 |
|
|
* get in touch with me so I can drive to where you live and
|
552 |
|
|
* shake your hand personally. :)
|
553 |
|
|
*/
|
554 |
|
|
foreach ($bad_attvals as $matchtag => $matchattrs) {
|
555 |
|
|
if (preg_match($matchtag, $tagname)) {
|
556 |
|
|
foreach ($matchattrs as $matchattr => $valary) {
|
557 |
|
|
if (preg_match($matchattr, $attname)) {
|
558 |
|
|
/**
|
559 |
|
|
* There are two arrays in valary.
|
560 |
|
|
* First is matches.
|
561 |
|
|
* Second one is replacements
|
562 |
|
|
*/
|
563 |
|
|
list($valmatch, $valrepl) = $valary;
|
564 |
|
|
$newvalue = preg_replace($valmatch, $valrepl, $attvalue);
|
565 |
|
|
if ($newvalue != $attvalue) {
|
566 |
|
|
$attary{$attname} = $newvalue;
|
567 |
|
|
$attvalue = $newvalue;
|
568 |
|
|
}
|
569 |
|
|
}
|
570 |
|
|
}
|
571 |
|
|
}
|
572 |
|
|
}
|
573 |
|
|
if ($attname == 'style') {
|
574 |
|
|
if (preg_match('/[\0-\37\200-\377]+/', $attvalue)) {
|
575 |
|
|
$attary{$attname} = '"disallowed character"';
|
576 |
|
|
}
|
577 |
|
|
preg_match_all("/url\s*\((.+)\)/si", $attvalue, $aMatch);
|
578 |
|
|
if (count($aMatch)) {
|
579 |
|
|
foreach($aMatch[1] as $sMatch) {
|
580 |
|
|
$urlvalue = $sMatch;
|
581 |
|
|
tln_fixurl($attname, $urlvalue, $trans_image_path, $block_external_images);
|
582 |
|
|
$attary{$attname} = str_replace($sMatch, $urlvalue, $attvalue);
|
583 |
|
|
}
|
584 |
|
|
}
|
585 |
|
|
}
|
586 |
|
|
}
|
587 |
|
|
/**
|
588 |
|
|
* See if we need to append any attributes to this tag.
|
589 |
|
|
*/
|
590 |
|
|
foreach ($add_attr_to_tag as $matchtag => $addattary) {
|
591 |
|
|
if (preg_match($matchtag, $tagname)) {
|
592 |
|
|
$attary = array_merge($attary, $addattary);
|
593 |
|
|
}
|
594 |
|
|
}
|
595 |
|
|
return $attary;
|
596 |
|
|
}
|
597 |
|
|
|
598 |
|
|
function tln_fixurl($attname, &$attvalue, $trans_image_path, $block_external_images)
|
599 |
|
|
{
|
600 |
|
|
$sQuote = '"';
|
601 |
|
|
$attvalue = trim($attvalue);
|
602 |
|
|
if ($attvalue && ($attvalue[0] =='"'|| $attvalue[0] == "'")) {
|
603 |
|
|
// remove the double quotes
|
604 |
|
|
$sQuote = $attvalue[0];
|
605 |
|
|
$attvalue = trim(substr($attvalue,1,-1));
|
606 |
|
|
}
|
607 |
|
|
|
608 |
|
|
/**
|
609 |
|
|
* Replace empty src tags with the blank image. src is only used
|
610 |
|
|
* for frames, images, and image inputs. Doing a replace should
|
611 |
|
|
* not affect them working as should be, however it will stop
|
612 |
|
|
* IE from being kicked off when src for img tags are not set
|
613 |
|
|
*/
|
614 |
|
|
if ($attvalue == '') {
|
615 |
|
|
$attvalue = $sQuote . $trans_image_path . $sQuote;
|
616 |
|
|
} else {
|
617 |
|
|
// first, disallow 8 bit characters and control characters
|
618 |
|
|
if (preg_match('/[\0-\37\200-\377]+/',$attvalue)) {
|
619 |
|
|
switch ($attname) {
|
620 |
|
|
case 'href':
|
621 |
|
|
$attvalue = $sQuote . 'http://invalid-stuff-detected.example.com' . $sQuote;
|
622 |
|
|
break;
|
623 |
|
|
default:
|
624 |
|
|
$attvalue = $sQuote . $trans_image_path . $sQuote;
|
625 |
|
|
break;
|
626 |
|
|
}
|
627 |
|
|
} else {
|
628 |
|
|
$aUrl = parse_url($attvalue);
|
629 |
|
|
if (isset($aUrl['scheme'])) {
|
630 |
|
|
switch(strtolower($aUrl['scheme'])) {
|
631 |
|
|
case 'mailto':
|
632 |
|
|
case 'http':
|
633 |
|
|
case 'https':
|
634 |
|
|
case 'ftp':
|
635 |
|
|
if ($attname != 'href') {
|
636 |
|
|
if ($block_external_images == true) {
|
637 |
|
|
$attvalue = $sQuote . $trans_image_path . $sQuote;
|
638 |
|
|
} else {
|
639 |
|
|
if (!isset($aUrl['path'])) {
|
640 |
|
|
$attvalue = $sQuote . $trans_image_path . $sQuote;
|
641 |
|
|
}
|
642 |
|
|
}
|
643 |
|
|
} else {
|
644 |
|
|
$attvalue = $sQuote . $attvalue . $sQuote;
|
645 |
|
|
}
|
646 |
|
|
break;
|
647 |
|
|
case 'outbind':
|
648 |
|
|
$attvalue = $sQuote . $attvalue . $sQuote;
|
649 |
|
|
break;
|
650 |
|
|
case 'cid':
|
651 |
|
|
$attvalue = $sQuote . $attvalue . $sQuote;
|
652 |
|
|
break;
|
653 |
|
|
default:
|
654 |
|
|
$attvalue = $sQuote . $trans_image_path . $sQuote;
|
655 |
|
|
break;
|
656 |
|
|
}
|
657 |
|
|
} else {
|
658 |
|
|
if (!isset($aUrl['path']) || $aUrl['path'] != $trans_image_path) {
|
659 |
|
|
$$attvalue = $sQuote . $trans_image_path . $sQuote;
|
660 |
|
|
}
|
661 |
|
|
}
|
662 |
|
|
}
|
663 |
|
|
}
|
664 |
|
|
}
|
665 |
|
|
|
666 |
|
|
function tln_fixstyle($body, $pos, $trans_image_path, $block_external_images)
|
667 |
|
|
{
|
668 |
|
|
// workaround for </style> in between comments
|
669 |
|
|
$content = '';
|
670 |
|
|
$sToken = '';
|
671 |
|
|
$bSucces = false;
|
672 |
|
|
$bEndTag = false;
|
673 |
|
|
for ($i=$pos,$iCount=strlen($body);$i<$iCount;++$i) {
|
674 |
|
|
$char = $body{$i};
|
675 |
|
|
switch ($char) {
|
676 |
|
|
case '<':
|
677 |
|
|
$sToken = $char;
|
678 |
|
|
break;
|
679 |
|
|
case '/':
|
680 |
|
|
if ($sToken == '<') {
|
681 |
|
|
$sToken .= $char;
|
682 |
|
|
$bEndTag = true;
|
683 |
|
|
} else {
|
684 |
|
|
$content .= $char;
|
685 |
|
|
}
|
686 |
|
|
break;
|
687 |
|
|
case '>':
|
688 |
|
|
if ($bEndTag) {
|
689 |
|
|
$sToken .= $char;
|
690 |
|
|
if (preg_match('/\<\/\s*style\s*\>/i',$sToken,$aMatch)) {
|
691 |
|
|
$newpos = $i + 1;
|
692 |
|
|
$bSucces = true;
|
693 |
|
|
break 2;
|
694 |
|
|
} else {
|
695 |
|
|
$content .= $sToken;
|
696 |
|
|
}
|
697 |
|
|
$bEndTag = false;
|
698 |
|
|
} else {
|
699 |
|
|
$content .= $char;
|
700 |
|
|
}
|
701 |
|
|
break;
|
702 |
|
|
case '!':
|
703 |
|
|
if ($sToken == '<') {
|
704 |
|
|
// possible comment
|
705 |
|
|
if (isset($body{$i+2}) && substr($body,$i,3) == '!--') {
|
706 |
|
|
$i = strpos($body,'-->',$i+3);
|
707 |
|
|
if ($i === false) { // no end comment
|
708 |
|
|
$i = strlen($body);
|
709 |
|
|
}
|
710 |
|
|
$sToken = '';
|
711 |
|
|
}
|
712 |
|
|
} else {
|
713 |
|
|
$content .= $char;
|
714 |
|
|
}
|
715 |
|
|
break;
|
716 |
|
|
default:
|
717 |
|
|
if ($bEndTag) {
|
718 |
|
|
$sToken .= $char;
|
719 |
|
|
} else {
|
720 |
|
|
$content .= $char;
|
721 |
|
|
}
|
722 |
|
|
break;
|
723 |
|
|
}
|
724 |
|
|
}
|
725 |
|
|
if ($bSucces == FALSE){
|
726 |
|
|
return array(FALSE, strlen($body));
|
727 |
|
|
}
|
728 |
|
|
|
729 |
|
|
|
730 |
|
|
|
731 |
|
|
/**
|
732 |
|
|
* First look for general BODY style declaration, which would be
|
733 |
|
|
* like so:
|
734 |
|
|
* body {background: blah-blah}
|
735 |
|
|
* and change it to .bodyclass so we can just assign it to a <div>
|
736 |
|
|
*/
|
737 |
|
|
$content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
|
738 |
|
|
|
739 |
|
|
/**
|
740 |
|
|
* Fix url('blah') declarations.
|
741 |
|
|
*/
|
742 |
|
|
// $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
|
743 |
|
|
// "url(\\1$trans_image_path\\2)", $content);
|
744 |
|
|
|
745 |
|
|
// first check for 8bit sequences and disallowed control characters
|
746 |
|
|
if (preg_match('/[\16-\37\200-\377]+/',$content)) {
|
747 |
|
|
$content = '<!-- style block removed by html filter due to presence of 8bit characters -->';
|
748 |
|
|
return array($content, $newpos);
|
749 |
|
|
}
|
750 |
|
|
|
751 |
|
|
// remove @import line
|
752 |
|
|
$content = preg_replace("/^\s*(@import.*)$/mi","\n<!-- @import rules forbidden -->\n",$content);
|
753 |
|
|
|
754 |
|
|
$content = preg_replace("/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i", 'url', $content);
|
755 |
|
|
preg_match_all("/url\s*\((.+)\)/si",$content,$aMatch);
|
756 |
|
|
if (count($aMatch)) {
|
757 |
|
|
$aValue = $aReplace = array();
|
758 |
|
|
foreach($aMatch[1] as $sMatch) {
|
759 |
|
|
// url value
|
760 |
|
|
$urlvalue = $sMatch;
|
761 |
|
|
tln_fixurl('style',$urlvalue, $trans_image_path, $block_external_images);
|
762 |
|
|
$aValue[] = $sMatch;
|
763 |
|
|
$aReplace[] = $urlvalue;
|
764 |
|
|
}
|
765 |
|
|
$content = str_replace($aValue,$aReplace,$content);
|
766 |
|
|
}
|
767 |
|
|
|
768 |
|
|
/**
|
769 |
|
|
* Remove any backslashes, entities, and extraneous whitespace.
|
770 |
|
|
*/
|
771 |
|
|
$contentTemp = $content;
|
772 |
|
|
tln_defang($contentTemp);
|
773 |
|
|
tln_unspace($contentTemp);
|
774 |
|
|
|
775 |
|
|
$match = Array('/\/\*.*\*\//',
|
776 |
|
|
'/expression/i',
|
777 |
|
|
'/behaviou*r/i',
|
778 |
|
|
'/binding/i',
|
779 |
|
|
'/include-source/i',
|
780 |
|
|
'/javascript/i',
|
781 |
|
|
'/script/i',
|
782 |
|
|
'/position/i');
|
783 |
|
|
$replace = Array('','idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', 'idiocy', '');
|
784 |
|
|
$contentNew = preg_replace($match, $replace, $contentTemp);
|
785 |
|
|
if ($contentNew !== $contentTemp) {
|
786 |
|
|
$content = $contentNew;
|
787 |
|
|
}
|
788 |
|
|
return array($content, $newpos);
|
789 |
|
|
}
|
790 |
|
|
|
791 |
|
|
function tln_body2div($attary, $trans_image_path)
|
792 |
|
|
{
|
793 |
|
|
$divattary = array('class' => "'bodyclass'");
|
794 |
|
|
$text = '#000000';
|
795 |
|
|
$has_bgc_stl = $has_txt_stl = false;
|
796 |
|
|
$styledef = '';
|
797 |
|
|
if (is_array($attary) && sizeof($attary) > 0){
|
798 |
|
|
foreach ($attary as $attname=>$attvalue){
|
799 |
|
|
$quotchar = substr($attvalue, 0, 1);
|
800 |
|
|
$attvalue = str_replace($quotchar, "", $attvalue);
|
801 |
|
|
switch ($attname){
|
802 |
|
|
case 'background':
|
803 |
|
|
$styledef .= "background-image: url('$trans_image_path'); ";
|
804 |
|
|
break;
|
805 |
|
|
case 'bgcolor':
|
806 |
|
|
$has_bgc_stl = true;
|
807 |
|
|
$styledef .= "background-color: $attvalue; ";
|
808 |
|
|
break;
|
809 |
|
|
case 'text':
|
810 |
|
|
$has_txt_stl = true;
|
811 |
|
|
$styledef .= "color: $attvalue; ";
|
812 |
|
|
break;
|
813 |
|
|
}
|
814 |
|
|
}
|
815 |
|
|
// Outlook defines a white bgcolor and no text color. This can lead to
|
816 |
|
|
// white text on a white bg with certain themes.
|
817 |
|
|
if ($has_bgc_stl && !$has_txt_stl) {
|
818 |
|
|
$styledef .= "color: $text; ";
|
819 |
|
|
}
|
820 |
|
|
if (strlen($styledef) > 0){
|
821 |
|
|
$divattary{"style"} = "\"$styledef\"";
|
822 |
|
|
}
|
823 |
|
|
}
|
824 |
|
|
return $divattary;
|
825 |
|
|
}
|
826 |
|
|
|
827 |
|
|
/**
|
828 |
|
|
*
|
829 |
|
|
* @param string $body The HTML you wish to filter
|
830 |
|
|
* @param array $tag_list see description above
|
831 |
|
|
* @param array $rm_tags_with_content see description above
|
832 |
|
|
* @param array $self_closing_tags see description above
|
833 |
|
|
* @param boolean $force_tag_closing see description above
|
834 |
|
|
* @param array $rm_attnames see description above
|
835 |
|
|
* @param array $bad_attvals see description above
|
836 |
|
|
* @param array $add_attr_to_tag see description above
|
837 |
|
|
* @param string $trans_image_path
|
838 |
|
|
* @param boolean $block_external_images
|
839 |
|
|
|
840 |
|
|
* @return string Sanitized html safe to show on your pages.
|
841 |
|
|
*/
|
842 |
|
|
function tln_sanitize(
|
843 |
|
|
$body,
|
844 |
|
|
$tag_list,
|
845 |
|
|
$rm_tags_with_content,
|
846 |
|
|
$self_closing_tags,
|
847 |
|
|
$force_tag_closing,
|
848 |
|
|
$rm_attnames,
|
849 |
|
|
$bad_attvals,
|
850 |
|
|
$add_attr_to_tag,
|
851 |
|
|
$trans_image_path,
|
852 |
|
|
$block_external_images
|
853 |
|
|
) {
|
854 |
|
|
/**
|
855 |
|
|
* Normalize rm_tags and rm_tags_with_content.
|
856 |
|
|
*/
|
857 |
|
|
$rm_tags = array_shift($tag_list);
|
858 |
|
|
@array_walk($tag_list, 'tln_casenormalize');
|
859 |
|
|
@array_walk($rm_tags_with_content, 'tln_casenormalize');
|
860 |
|
|
@array_walk($self_closing_tags, 'tln_casenormalize');
|
861 |
|
|
/**
|
862 |
|
|
* See if tag_list is of tags to remove or tags to allow.
|
863 |
|
|
* false means remove these tags
|
864 |
|
|
* true means allow these tags
|
865 |
|
|
*/
|
866 |
|
|
$curpos = 0;
|
867 |
|
|
$open_tags = array();
|
868 |
|
|
$trusted = "<!-- begin tln_sanitized html -->\n";
|
869 |
|
|
$skip_content = false;
|
870 |
|
|
/**
|
871 |
|
|
* Take care of netscape's stupid javascript entities like
|
872 |
|
|
* &{alert('boo')};
|
873 |
|
|
*/
|
874 |
|
|
$body = preg_replace('/&(\{.*?\};)/si', '&\\1', $body);
|
875 |
|
|
while (($curtag = tln_getnxtag($body, $curpos)) != false) {
|
876 |
|
|
list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
|
877 |
|
|
$free_content = substr($body, $curpos, $lt-$curpos);
|
878 |
|
|
/**
|
879 |
|
|
* Take care of <style>
|
880 |
|
|
*/
|
881 |
|
|
if ($tagname == "style" && $tagtype == 1){
|
882 |
|
|
list($free_content, $curpos) =
|
883 |
|
|
tln_fixstyle($body, $gt+1, $trans_image_path, $block_external_images);
|
884 |
|
|
if ($free_content != FALSE){
|
885 |
|
|
if ( !empty($attary) ) {
|
886 |
|
|
$attary = tln_fixatts($tagname,
|
887 |
|
|
$attary,
|
888 |
|
|
$rm_attnames,
|
889 |
|
|
$bad_attvals,
|
890 |
|
|
$add_attr_to_tag,
|
891 |
|
|
$trans_image_path,
|
892 |
|
|
$block_external_images
|
893 |
|
|
);
|
894 |
|
|
}
|
895 |
|
|
$trusted .= tln_tagprint($tagname, $attary, $tagtype);
|
896 |
|
|
$trusted .= $free_content;
|
897 |
|
|
$trusted .= tln_tagprint($tagname, null, 2);
|
898 |
|
|
}
|
899 |
|
|
continue;
|
900 |
|
|
}
|
901 |
|
|
if ($skip_content == false){
|
902 |
|
|
$trusted .= $free_content;
|
903 |
|
|
}
|
904 |
|
|
if ($tagname != false) {
|
905 |
|
|
if ($tagtype == 2) {
|
906 |
|
|
if ($skip_content == $tagname) {
|
907 |
|
|
/**
|
908 |
|
|
* Got to the end of tag we needed to remove.
|
909 |
|
|
*/
|
910 |
|
|
$tagname = false;
|
911 |
|
|
$skip_content = false;
|
912 |
|
|
} else {
|
913 |
|
|
if ($skip_content == false) {
|
914 |
|
|
if ($tagname == "body") {
|
915 |
|
|
$tagname = "div";
|
916 |
|
|
}
|
917 |
|
|
if (isset($open_tags{$tagname}) &&
|
918 |
|
|
$open_tags{$tagname} > 0
|
919 |
|
|
) {
|
920 |
|
|
$open_tags{$tagname}--;
|
921 |
|
|
} else {
|
922 |
|
|
$tagname = false;
|
923 |
|
|
}
|
924 |
|
|
}
|
925 |
|
|
}
|
926 |
|
|
} else {
|
927 |
|
|
/**
|
928 |
|
|
* $rm_tags_with_content
|
929 |
|
|
*/
|
930 |
|
|
if ($skip_content == false) {
|
931 |
|
|
/**
|
932 |
|
|
* See if this is a self-closing type and change
|
933 |
|
|
* tagtype appropriately.
|
934 |
|
|
*/
|
935 |
|
|
if ($tagtype == 1
|
936 |
|
|
&& in_array($tagname, $self_closing_tags)
|
937 |
|
|
) {
|
938 |
|
|
$tagtype = 3;
|
939 |
|
|
}
|
940 |
|
|
/**
|
941 |
|
|
* See if we should skip this tag and any content
|
942 |
|
|
* inside it.
|
943 |
|
|
*/
|
944 |
|
|
if ($tagtype == 1
|
945 |
|
|
&& in_array($tagname, $rm_tags_with_content)
|
946 |
|
|
) {
|
947 |
|
|
$skip_content = $tagname;
|
948 |
|
|
} else {
|
949 |
|
|
if (($rm_tags == false
|
950 |
|
|
&& in_array($tagname, $tag_list)) ||
|
951 |
|
|
($rm_tags == true
|
952 |
|
|
&& !in_array($tagname, $tag_list))
|
953 |
|
|
) {
|
954 |
|
|
$tagname = false;
|
955 |
|
|
} else {
|
956 |
|
|
/**
|
957 |
|
|
* Convert body into div.
|
958 |
|
|
*/
|
959 |
|
|
if ($tagname == "body"){
|
960 |
|
|
$tagname = "div";
|
961 |
|
|
$attary = tln_body2div($attary, $trans_image_path);
|
962 |
|
|
}
|
963 |
|
|
if ($tagtype == 1) {
|
964 |
|
|
if (isset($open_tags{$tagname})) {
|
965 |
|
|
$open_tags{$tagname}++;
|
966 |
|
|
} else {
|
967 |
|
|
$open_tags{$tagname} = 1;
|
968 |
|
|
}
|
969 |
|
|
}
|
970 |
|
|
/**
|
971 |
|
|
* This is where we run other checks.
|
972 |
|
|
*/
|
973 |
|
|
if (is_array($attary) && sizeof($attary) > 0) {
|
974 |
|
|
$attary = tln_fixatts(
|
975 |
|
|
$tagname,
|
976 |
|
|
$attary,
|
977 |
|
|
$rm_attnames,
|
978 |
|
|
$bad_attvals,
|
979 |
|
|
$add_attr_to_tag,
|
980 |
|
|
$trans_image_path,
|
981 |
|
|
$block_external_images
|
982 |
|
|
);
|
983 |
|
|
}
|
984 |
|
|
}
|
985 |
|
|
}
|
986 |
|
|
}
|
987 |
|
|
}
|
988 |
|
|
if ($tagname != false && $skip_content == false) {
|
989 |
|
|
$trusted .= tln_tagprint($tagname, $attary, $tagtype);
|
990 |
|
|
}
|
991 |
|
|
}
|
992 |
|
|
$curpos = $gt + 1;
|
993 |
|
|
}
|
994 |
|
|
$trusted .= substr($body, $curpos, strlen($body) - $curpos);
|
995 |
|
|
if ($force_tag_closing == true) {
|
996 |
|
|
foreach ($open_tags as $tagname => $opentimes) {
|
997 |
|
|
while ($opentimes > 0) {
|
998 |
|
|
$trusted .= '</' . $tagname . '>';
|
999 |
|
|
$opentimes--;
|
1000 |
|
|
}
|
1001 |
|
|
}
|
1002 |
|
|
$trusted .= "\n";
|
1003 |
|
|
}
|
1004 |
|
|
$trusted .= "<!-- end tln_sanitized html -->\n";
|
1005 |
|
|
return $trusted;
|
1006 |
|
|
}
|
1007 |
|
|
|
1008 |
|
|
//
|
1009 |
|
|
// Use the nifty htmlfilter library
|
1010 |
|
|
//
|
1011 |
|
|
|
1012 |
|
|
|
1013 |
|
|
function HTMLFilter($body, $trans_image_path, $block_external_images = false)
|
1014 |
|
|
{
|
1015 |
|
|
|
1016 |
|
|
$tag_list = array(
|
1017 |
|
|
false,
|
1018 |
|
|
"object",
|
1019 |
|
|
"meta",
|
1020 |
|
|
"html",
|
1021 |
|
|
"head",
|
1022 |
|
|
"base",
|
1023 |
|
|
"link",
|
1024 |
|
|
"frame",
|
1025 |
|
|
"iframe",
|
1026 |
|
|
"plaintext",
|
1027 |
|
|
"marquee"
|
1028 |
|
|
);
|
1029 |
|
|
|
1030 |
|
|
$rm_tags_with_content = array(
|
1031 |
|
|
"script",
|
1032 |
|
|
"applet",
|
1033 |
|
|
"embed",
|
1034 |
|
|
"title",
|
1035 |
|
|
"frameset",
|
1036 |
|
|
"xmp",
|
1037 |
|
|
"xml"
|
1038 |
|
|
);
|
1039 |
|
|
|
1040 |
|
|
$self_closing_tags = array(
|
1041 |
|
|
"img",
|
1042 |
|
|
"br",
|
1043 |
|
|
"hr",
|
1044 |
|
|
"input",
|
1045 |
|
|
"outbind"
|
1046 |
|
|
);
|
1047 |
|
|
|
1048 |
|
|
$force_tag_closing = true;
|
1049 |
|
|
|
1050 |
|
|
$rm_attnames = array(
|
1051 |
|
|
"/.*/" =>
|
1052 |
|
|
array(
|
1053 |
|
|
// "/target/i",
|
1054 |
|
|
"/^on.*/i",
|
1055 |
|
|
"/^dynsrc/i",
|
1056 |
|
|
"/^data.*/i",
|
1057 |
|
|
"/^lowsrc.*/i"
|
1058 |
|
|
)
|
1059 |
|
|
);
|
1060 |
|
|
|
1061 |
|
|
$bad_attvals = array(
|
1062 |
|
|
"/.*/" =>
|
1063 |
|
|
array(
|
1064 |
|
|
"/^src|background/i" =>
|
1065 |
|
|
array(
|
1066 |
|
|
array(
|
1067 |
|
|
'/^([\'"])\s*\S+script\s*:.*([\'"])/si',
|
1068 |
|
|
'/^([\'"])\s*mocha\s*:*.*([\'"])/si',
|
1069 |
|
|
'/^([\'"])\s*about\s*:.*([\'"])/si'
|
1070 |
|
|
),
|
1071 |
|
|
array(
|
1072 |
|
|
"\\1$trans_image_path\\2",
|
1073 |
|
|
"\\1$trans_image_path\\2",
|
1074 |
|
|
"\\1$trans_image_path\\2"
|
1075 |
|
|
)
|
1076 |
|
|
),
|
1077 |
|
|
"/^href|action/i" =>
|
1078 |
|
|
array(
|
1079 |
|
|
array(
|
1080 |
|
|
'/^([\'"])\s*\S+script\s*:.*([\'"])/si',
|
1081 |
|
|
'/^([\'"])\s*mocha\s*:*.*([\'"])/si',
|
1082 |
|
|
'/^([\'"])\s*about\s*:.*([\'"])/si'
|
1083 |
|
|
),
|
1084 |
|
|
array(
|
1085 |
|
|
"\\1#\\1",
|
1086 |
|
|
"\\1#\\1",
|
1087 |
|
|
"\\1#\\1"
|
1088 |
|
|
)
|
1089 |
|
|
),
|
1090 |
|
|
"/^style/i" =>
|
1091 |
|
|
array(
|
1092 |
|
|
array(
|
1093 |
|
|
"/\/\*.*\*\//",
|
1094 |
|
|
"/expression/i",
|
1095 |
|
|
"/binding/i",
|
1096 |
|
|
"/behaviou*r/i",
|
1097 |
|
|
"/include-source/i",
|
1098 |
|
|
'/position\s*:/i',
|
1099 |
|
|
'/(\\\\)?u(\\\\)?r(\\\\)?l(\\\\)?/i',
|
1100 |
|
|
'/url\s*\(\s*([\'"])\s*\S+script\s*:.*([\'"])\s*\)/si',
|
1101 |
|
|
'/url\s*\(\s*([\'"])\s*mocha\s*:.*([\'"])\s*\)/si',
|
1102 |
|
|
'/url\s*\(\s*([\'"])\s*about\s*:.*([\'"])\s*\)/si',
|
1103 |
|
|
'/(.*)\s*:\s*url\s*\(\s*([\'"]*)\s*\S+script\s*:.*([\'"]*)\s*\)/si'
|
1104 |
|
|
),
|
1105 |
|
|
array(
|
1106 |
|
|
"",
|
1107 |
|
|
"idiocy",
|
1108 |
|
|
"idiocy",
|
1109 |
|
|
"idiocy",
|
1110 |
|
|
"idiocy",
|
1111 |
|
|
"idiocy",
|
1112 |
|
|
"url",
|
1113 |
|
|
"url(\\1#\\1)",
|
1114 |
|
|
"url(\\1#\\1)",
|
1115 |
|
|
"url(\\1#\\1)",
|
1116 |
|
|
"\\1:url(\\2#\\3)"
|
1117 |
|
|
)
|
1118 |
|
|
)
|
1119 |
|
|
)
|
1120 |
|
|
);
|
1121 |
|
|
|
1122 |
|
|
if ($block_external_images) {
|
1123 |
|
|
array_push(
|
1124 |
|
|
$bad_attvals{'/.*/'}{'/^src|background/i'}[0],
|
1125 |
|
|
'/^([\'\"])\s*https*:.*([\'\"])/si'
|
1126 |
|
|
);
|
1127 |
|
|
array_push(
|
1128 |
|
|
$bad_attvals{'/.*/'}{'/^src|background/i'}[1],
|
1129 |
|
|
"\\1$trans_image_path\\1"
|
1130 |
|
|
);
|
1131 |
|
|
array_push(
|
1132 |
|
|
$bad_attvals{'/.*/'}{'/^style/i'}[0],
|
1133 |
|
|
'/url\(([\'\"])\s*https*:.*([\'\"])\)/si'
|
1134 |
|
|
);
|
1135 |
|
|
array_push(
|
1136 |
|
|
$bad_attvals{'/.*/'}{'/^style/i'}[1],
|
1137 |
|
|
"url(\\1$trans_image_path\\1)"
|
1138 |
|
|
);
|
1139 |
|
|
}
|
1140 |
|
|
|
1141 |
|
|
$add_attr_to_tag = array(
|
1142 |
|
|
"/^a$/i" =>
|
1143 |
|
|
array('target' => '"_blank"')
|
1144 |
|
|
);
|
1145 |
|
|
|
1146 |
|
|
$trusted = tln_sanitize(
|
1147 |
|
|
$body,
|
1148 |
|
|
$tag_list,
|
1149 |
|
|
$rm_tags_with_content,
|
1150 |
|
|
$self_closing_tags,
|
1151 |
|
|
$force_tag_closing,
|
1152 |
|
|
$rm_attnames,
|
1153 |
|
|
$bad_attvals,
|
1154 |
|
|
$add_attr_to_tag,
|
1155 |
|
|
$trans_image_path,
|
1156 |
|
|
$block_external_images
|
1157 |
|
|
);
|
1158 |
|
|
return $trusted;
|
1159 |
|
|
}
|