<?php
/*********************************************************************************
* SugarCRM Community Edition is a customer relationship management program developed by
* SugarCRM, Inc. Copyright (C) 2004-2012 SugarCRM Inc.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU Affero General Public License version 3 as published by the
* Free Software Foundation with the addition of the following permission added
* to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK
* IN WHICH THE COPYRIGHT IS OWNED BY SUGARCRM, SUGARCRM DISCLAIMS THE WARRANTY
* OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
* details.
*
* You should have received a copy of the GNU Affero General Public License along with
* this program; if not, see http://www.gnu.org/licenses or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*
* You can contact SugarCRM, Inc. headquarters at 10050 North Wolfe Road,
* SW2-130, Cupertino, CA 95014, USA. or at email address contact@sugarcrm.com.
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License version 3.
*
* In accordance with Section 7(b) of the GNU Affero General Public License version 3,
* these Appropriate Legal Notices must retain the display of the "Powered by
* SugarCRM" logo. If the display of the logo is not reasonably feasible for
* technical reasons, the Appropriate Legal Notices must display the words
* "Powered by SugarCRM".
********************************************************************************/
require_once 'include/HTMLPurifier/HTMLPurifier.standalone.php';
require_once 'include/HTMLPurifier/HTMLPurifier.autoload.php';
/**
* cid: scheme implementation
*/
class HTMLPurifier_URIScheme_cid extends HTMLPurifier_URIScheme
{
public $browsable = true;
public $may_omit_host = true;
public function doValidate(&$uri, $config, $context) {
$uri->userinfo = null;
$uri->port = null;
$uri->host = null;
$uri->query = null;
$uri->fragment = null;
return true;
}
}
class HTMLPurifier_Filter_Xmp extends HTMLPurifier_Filter
{
public $name = 'Xmp';
public function preFilter($html, $config, $context)
{
return preg_replace("#<(/)?xmp>#i", "<\\1pre>", $html);
}
}
class SugarCleaner
{
/**
* Singleton instance
* @var SugarCleaner
*/
static public $instance;
/**
* HTMLPurifier instance
* @var HTMLPurifier
*/
protected $purifier;
function __construct()
{
global $sugar_config;
$config = HTMLPurifier_Config::createDefault();
if(!is_dir(sugar_cached("htmlclean"))) {
create_cache_directory("htmlclean/");
}
$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
$config->set('Core.Encoding', 'UTF-8');
$hidden_tags = array('script' => true, 'style' => true, 'title' => true, 'head' => true);
$config->set('Core.HiddenElements', $hidden_tags);
$config->set('Cache.SerializerPath', sugar_cached("htmlclean"));
$config->set('URI.Base', $sugar_config['site_url']);
$config->set('CSS.Proprietary', true);
$config->set('HTML.TidyLevel', 'light');
$config->set('HTML.ForbiddenElements', array('body' => true, 'html' => true));
$config->set('AutoFormat.RemoveEmpty', false);
$config->set('Cache.SerializerPermissions', 0775);
// for style
//$config->set('Filter.ExtractStyleBlocks', true);
$config->set('Filter.ExtractStyleBlocks.TidyImpl', false); // can't use csstidy, GPL
if(!empty($GLOBALS['sugar_config']['html_allow_objects'])) {
// for object
$config->set('HTML.SafeObject', true);
// for embed
$config->set('HTML.SafeEmbed', true);
}
$config->set('Output.FlashCompat', true);
// for iframe and xmp
$config->set('Filter.Custom', array(new HTMLPurifier_Filter_Xmp()));
// for link
$config->set('HTML.DefinitionID', 'Sugar HTML Def');
$config->set('HTML.DefinitionRev', 2);
$config->set('Cache.SerializerPath', sugar_cached('htmlclean/'));
// IDs are namespaced
$config->set('Attr.EnableID', true);
$config->set('Attr.IDPrefix', 'sugar_text_');
if ($def = $config->maybeGetRawHTMLDefinition()) {
$form = $def->addElement(
'link', // name
'Flow', // content set
'Empty', // allowed children
'Core', // attribute collection
array( // attributes
'href*' => 'URI',
'rel' => 'Enum#stylesheet', // only stylesheets supported here
'type' => 'Enum#text/css' // only CSS supported here
)
);
$iframe = $def->addElement(
'iframe', // name
'Flow', // content set
'Optional: #PCDATA | Flow | Block', // allowed children
'Core', // attribute collection
array( // attributes
'src*' => 'URI',
'frameborder' => 'Enum#0,1',
'marginwidth' => 'Pixels',
'marginheight' => 'Pixels',
'scrolling' => 'Enum#|yes,no,auto',
'align' => 'Enum#top,middle,bottom,left,right,center',
'height' => 'Length',
'width' => 'Length',
)
);
$iframe->excludes=array('iframe');
}
$uri = $config->getDefinition('URI');
$uri->addFilter(new SugarURIFilter(), $config);
HTMLPurifier_URISchemeRegistry::instance()->register('cid', new HTMLPurifier_URIScheme_cid());
$this->purifier = new HTMLPurifier($config);
}
/**
* Get cleaner instance
* @return SugarCleaner
*/
public static function getInstance()
{
if(is_null(self::$instance)) {
self::$instance = new self;
}
return self::$instance;
}
/**
* Clean string from potential XSS problems
* @param string $html
* @param bool $encoded Was it entity-encoded?
* @return string
*/
static public function cleanHtml($html, $encoded = false)
{
if(empty($html)) return $html;
if($encoded) {
$html = from_html($html);
}
if(!preg_match('<[^-A-Za-z0-9 `~!@#$%^&*()_=+{}\[\];:\'",./\\?\r\n|\x80-\xFF]>', $html)) {
/* if it only has "safe" chars, don't bother */
$cleanhtml = $html;
} else {
$purifier = self::getInstance()->purifier;
$cleanhtml = $purifier->purify($html);
// $styles = $purifier->context->get('StyleBlocks');
// if(count($styles) > 0) {
// $cleanhtml = "<style>".join("</style><style>", $styles)."</style>".$cleanhtml;
// }
}
if($encoded) {
$cleanhtml = to_html($cleanhtml);
}
return $cleanhtml;
}
static public function stripTags($string, $encoded = true)
{
if($encoded) {
$string = from_html($string);
}
$string = filter_var($string, FILTER_SANITIZE_STRIPPED, FILTER_FLAG_NO_ENCODE_QUOTES);
return $encoded?to_html($string):$string;
}
}
/**
* URI filter for HTMLPurifier
* Approves only resource URIs that are in the list of trusted domains
* Until we have comprehensive CSRF protection, we need to sanitize URLs in emails, etc.
* to avoid CSRF attacks.
*/
class SugarURIFilter extends HTMLPurifier_URIFilter
{
public $name = 'SugarURIFilter';
// public $post = true;
protected $allowed = array();
public function prepare($config)
{
global $sugar_config;
if(!empty($sugar_config['security_trusted_domains']) && is_array($sugar_config['security_trusted_domains']))
{
$this->allowed = $sugar_config['security_trusted_domains'];
}
/* Allow this host?
$def = $config->getDefinition('URI');
if(!empty($def->base) && !empty($this->base->host)) {
$this->allowed[] = $def->base->host;
}
*/
}
public function filter(&$uri, $config, $context)
{
// skip non-resource URIs
if (!$context->get('EmbeddedURI', true)) return true;
//if(empty($this->allowed)) return false;
if(!empty($uri->scheme) && strtolower($uri->scheme) != 'http' && strtolower($uri->scheme) != 'https') {
// do not touch non-HTTP URLs
return true;
}
// relative URLs permitted since email templates use it
// if(empty($uri->host)) return false;
// allow URLs with no query
if(empty($uri->query)) return true;
// allow URLs for known good hosts
foreach($this->allowed as $allow) {
// must be equal to our domain or subdomain of our domain
if($uri->host == $allow || substr($uri->host, -(strlen($allow)+1)) == ".$allow") {
return true;
}
}
// Here we try to block URLs that may be used for nasty XSRF stuff by
// referring back to Sugar URLs
// allow URLs that don't start with /? or /index.php?
if(!empty($uri->path) && $uri->path != '/') {
$lpath = strtolower($uri->path);
if(substr($lpath, -10) != '/index.php' && $lpath != 'index.php') {
return true;
}
}
$query_items = array();
parse_str(from_html($uri->query), $query_items);
// weird query, probably harmless
if(empty($query_items)) return true;
// suspiciously like SugarCRM query, reject
if(!empty($query_items['module']) && !empty($query_items['action'])) return false;
// looks like non-download entry point - allow only specific entry points
if(!empty($query_items['entryPoint']) && !in_array($query_items['entryPoint'], array('download', 'image', 'getImage'))) {
return false;
}
return true;
}
}
Mini Shell