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https://github.com/EGroupware/egroupware.git
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8f797be836
- can be used via html class like:
$clean_html = html::purify($html);
- using it now in eTemplate to remove malicious code from html:
a) when displaying "formatted text"
b) when "formatted text" get's input by the user
421 lines
15 KiB
PHP
Executable File
421 lines
15 KiB
PHP
Executable File
<?php
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/**
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* Definition of the purified HTML that describes allowed children,
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* attributes, and many other things.
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*
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* Conventions:
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*
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* All member variables that are prefixed with info
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* (including the main $info array) are used by HTML Purifier internals
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* and should not be directly edited when customizing the HTMLDefinition.
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* They can usually be set via configuration directives or custom
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* modules.
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*
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* On the other hand, member variables without the info prefix are used
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* internally by the HTMLDefinition and MUST NOT be used by other HTML
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* Purifier internals. Many of them, however, are public, and may be
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* edited by userspace code to tweak the behavior of HTMLDefinition.
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*
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* @note This class is inspected by Printer_HTMLDefinition; please
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* update that class if things here change.
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*
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* @warning Directives that change this object's structure must be in
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* the HTML or Attr namespace!
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*/
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class HTMLPurifier_HTMLDefinition extends HTMLPurifier_Definition
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{
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// FULLY-PUBLIC VARIABLES ---------------------------------------------
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/**
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* Associative array of element names to HTMLPurifier_ElementDef
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*/
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public $info = array();
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/**
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* Associative array of global attribute name to attribute definition.
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*/
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public $info_global_attr = array();
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/**
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* String name of parent element HTML will be going into.
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*/
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public $info_parent = 'div';
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/**
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* Definition for parent element, allows parent element to be a
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* tag that's not allowed inside the HTML fragment.
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*/
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public $info_parent_def;
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/**
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* String name of element used to wrap inline elements in block context
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* @note This is rarely used except for BLOCKQUOTEs in strict mode
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*/
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public $info_block_wrapper = 'p';
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/**
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* Associative array of deprecated tag name to HTMLPurifier_TagTransform
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*/
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public $info_tag_transform = array();
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/**
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* Indexed list of HTMLPurifier_AttrTransform to be performed before validation.
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*/
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public $info_attr_transform_pre = array();
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/**
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* Indexed list of HTMLPurifier_AttrTransform to be performed after validation.
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*/
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public $info_attr_transform_post = array();
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/**
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* Nested lookup array of content set name (Block, Inline) to
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* element name to whether or not it belongs in that content set.
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*/
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public $info_content_sets = array();
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/**
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* Indexed list of HTMLPurifier_Injector to be used.
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*/
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public $info_injector = array();
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/**
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* Doctype object
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*/
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public $doctype;
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// RAW CUSTOMIZATION STUFF --------------------------------------------
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/**
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* Adds a custom attribute to a pre-existing element
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* @note This is strictly convenience, and does not have a corresponding
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* method in HTMLPurifier_HTMLModule
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* @param $element_name String element name to add attribute to
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* @param $attr_name String name of attribute
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* @param $def Attribute definition, can be string or object, see
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* HTMLPurifier_AttrTypes for details
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*/
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public function addAttribute($element_name, $attr_name, $def) {
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$module = $this->getAnonymousModule();
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if (!isset($module->info[$element_name])) {
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$element = $module->addBlankElement($element_name);
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} else {
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$element = $module->info[$element_name];
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}
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$element->attr[$attr_name] = $def;
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}
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/**
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* Adds a custom element to your HTML definition
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* @note See HTMLPurifier_HTMLModule::addElement for detailed
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* parameter and return value descriptions.
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*/
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public function addElement($element_name, $type, $contents, $attr_collections, $attributes) {
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$module = $this->getAnonymousModule();
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// assume that if the user is calling this, the element
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// is safe. This may not be a good idea
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$element = $module->addElement($element_name, $type, $contents, $attr_collections, $attributes);
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return $element;
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}
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/**
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* Adds a blank element to your HTML definition, for overriding
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* existing behavior
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* @note See HTMLPurifier_HTMLModule::addBlankElement for detailed
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* parameter and return value descriptions.
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*/
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public function addBlankElement($element_name) {
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$module = $this->getAnonymousModule();
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$element = $module->addBlankElement($element_name);
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return $element;
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}
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/**
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* Retrieves a reference to the anonymous module, so you can
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* bust out advanced features without having to make your own
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* module.
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*/
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public function getAnonymousModule() {
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if (!$this->_anonModule) {
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$this->_anonModule = new HTMLPurifier_HTMLModule();
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$this->_anonModule->name = 'Anonymous';
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}
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return $this->_anonModule;
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}
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private $_anonModule;
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// PUBLIC BUT INTERNAL VARIABLES --------------------------------------
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public $type = 'HTML';
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public $manager; /**< Instance of HTMLPurifier_HTMLModuleManager */
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/**
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* Performs low-cost, preliminary initialization.
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*/
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public function __construct() {
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$this->manager = new HTMLPurifier_HTMLModuleManager();
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}
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protected function doSetup($config) {
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$this->processModules($config);
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$this->setupConfigStuff($config);
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unset($this->manager);
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// cleanup some of the element definitions
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foreach ($this->info as $k => $v) {
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unset($this->info[$k]->content_model);
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unset($this->info[$k]->content_model_type);
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}
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}
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/**
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* Extract out the information from the manager
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*/
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protected function processModules($config) {
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if ($this->_anonModule) {
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// for user specific changes
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// this is late-loaded so we don't have to deal with PHP4
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// reference wonky-ness
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$this->manager->addModule($this->_anonModule);
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unset($this->_anonModule);
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}
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$this->manager->setup($config);
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$this->doctype = $this->manager->doctype;
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foreach ($this->manager->modules as $module) {
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foreach($module->info_tag_transform as $k => $v) {
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if ($v === false) unset($this->info_tag_transform[$k]);
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else $this->info_tag_transform[$k] = $v;
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}
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foreach($module->info_attr_transform_pre as $k => $v) {
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if ($v === false) unset($this->info_attr_transform_pre[$k]);
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else $this->info_attr_transform_pre[$k] = $v;
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}
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foreach($module->info_attr_transform_post as $k => $v) {
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if ($v === false) unset($this->info_attr_transform_post[$k]);
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else $this->info_attr_transform_post[$k] = $v;
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}
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foreach ($module->info_injector as $k => $v) {
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if ($v === false) unset($this->info_injector[$k]);
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else $this->info_injector[$k] = $v;
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}
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}
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$this->info = $this->manager->getElements();
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$this->info_content_sets = $this->manager->contentSets->lookup;
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}
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/**
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* Sets up stuff based on config. We need a better way of doing this.
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*/
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protected function setupConfigStuff($config) {
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$block_wrapper = $config->get('HTML', 'BlockWrapper');
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if (isset($this->info_content_sets['Block'][$block_wrapper])) {
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$this->info_block_wrapper = $block_wrapper;
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} else {
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trigger_error('Cannot use non-block element as block wrapper',
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E_USER_ERROR);
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}
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$parent = $config->get('HTML', 'Parent');
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$def = $this->manager->getElement($parent, true);
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if ($def) {
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$this->info_parent = $parent;
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$this->info_parent_def = $def;
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} else {
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trigger_error('Cannot use unrecognized element as parent',
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E_USER_ERROR);
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$this->info_parent_def = $this->manager->getElement($this->info_parent, true);
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}
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// support template text
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$support = "(for information on implementing this, see the ".
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"support forums) ";
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// setup allowed elements -----------------------------------------
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$allowed_elements = $config->get('HTML', 'AllowedElements');
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$allowed_attributes = $config->get('HTML', 'AllowedAttributes'); // retrieve early
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if (!is_array($allowed_elements) && !is_array($allowed_attributes)) {
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$allowed = $config->get('HTML', 'Allowed');
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if (is_string($allowed)) {
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list($allowed_elements, $allowed_attributes) = $this->parseTinyMCEAllowedList($allowed);
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}
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}
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if (is_array($allowed_elements)) {
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foreach ($this->info as $name => $d) {
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if(!isset($allowed_elements[$name])) unset($this->info[$name]);
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unset($allowed_elements[$name]);
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}
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// emit errors
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foreach ($allowed_elements as $element => $d) {
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$element = htmlspecialchars($element); // PHP doesn't escape errors, be careful!
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trigger_error("Element '$element' is not supported $support", E_USER_WARNING);
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}
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}
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// setup allowed attributes ---------------------------------------
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$allowed_attributes_mutable = $allowed_attributes; // by copy!
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if (is_array($allowed_attributes)) {
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// This actually doesn't do anything, since we went away from
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// global attributes. It's possible that userland code uses
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// it, but HTMLModuleManager doesn't!
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foreach ($this->info_global_attr as $attr => $x) {
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$keys = array($attr, "*@$attr", "*.$attr");
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$delete = true;
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foreach ($keys as $key) {
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if ($delete && isset($allowed_attributes[$key])) {
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$delete = false;
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}
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if (isset($allowed_attributes_mutable[$key])) {
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unset($allowed_attributes_mutable[$key]);
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}
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}
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if ($delete) unset($this->info_global_attr[$attr]);
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}
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foreach ($this->info as $tag => $info) {
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foreach ($info->attr as $attr => $x) {
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$keys = array("$tag@$attr", $attr, "*@$attr", "$tag.$attr", "*.$attr");
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$delete = true;
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foreach ($keys as $key) {
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if ($delete && isset($allowed_attributes[$key])) {
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$delete = false;
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}
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if (isset($allowed_attributes_mutable[$key])) {
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unset($allowed_attributes_mutable[$key]);
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}
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}
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if ($delete) unset($this->info[$tag]->attr[$attr]);
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}
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}
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// emit errors
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foreach ($allowed_attributes_mutable as $elattr => $d) {
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$bits = preg_split('/[.@]/', $elattr, 2);
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$c = count($bits);
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switch ($c) {
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case 2:
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if ($bits[0] !== '*') {
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$element = htmlspecialchars($bits[0]);
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$attribute = htmlspecialchars($bits[1]);
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if (!isset($this->info[$element])) {
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trigger_error("Cannot allow attribute '$attribute' if element '$element' is not allowed/supported $support");
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} else {
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trigger_error("Attribute '$attribute' in element '$element' not supported $support",
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E_USER_WARNING);
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}
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break;
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}
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// otherwise fall through
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case 1:
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$attribute = htmlspecialchars($bits[0]);
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trigger_error("Global attribute '$attribute' is not ".
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"supported in any elements $support",
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E_USER_WARNING);
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break;
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}
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}
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}
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// setup forbidden elements ---------------------------------------
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$forbidden_elements = $config->get('HTML', 'ForbiddenElements');
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$forbidden_attributes = $config->get('HTML', 'ForbiddenAttributes');
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foreach ($this->info as $tag => $info) {
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if (isset($forbidden_elements[$tag])) {
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unset($this->info[$tag]);
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continue;
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}
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foreach ($info->attr as $attr => $x) {
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if (
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isset($forbidden_attributes["$tag@$attr"]) ||
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isset($forbidden_attributes["*@$attr"]) ||
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isset($forbidden_attributes[$attr])
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) {
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unset($this->info[$tag]->attr[$attr]);
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continue;
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} // this segment might get removed eventually
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elseif (isset($forbidden_attributes["$tag.$attr"])) {
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// $tag.$attr are not user supplied, so no worries!
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trigger_error("Error with $tag.$attr: tag.attr syntax not supported for HTML.ForbiddenAttributes; use tag@attr instead", E_USER_WARNING);
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}
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}
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}
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foreach ($forbidden_attributes as $key => $v) {
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if (strlen($key) < 2) continue;
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if ($key[0] != '*') continue;
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if ($key[1] == '.') {
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trigger_error("Error with $key: *.attr syntax not supported for HTML.ForbiddenAttributes; use attr instead", E_USER_WARNING);
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}
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}
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// setup injectors -----------------------------------------------------
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foreach ($this->info_injector as $i => $injector) {
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if ($injector->checkNeeded($config) !== false) {
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// remove injector that does not have it's required
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// elements/attributes present, and is thus not needed.
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unset($this->info_injector[$i]);
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}
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}
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}
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/**
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* Parses a TinyMCE-flavored Allowed Elements and Attributes list into
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* separate lists for processing. Format is element[attr1|attr2],element2...
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* @warning Although it's largely drawn from TinyMCE's implementation,
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* it is different, and you'll probably have to modify your lists
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* @param $list String list to parse
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* @param array($allowed_elements, $allowed_attributes)
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* @todo Give this its own class, probably static interface
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*/
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public function parseTinyMCEAllowedList($list) {
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$list = str_replace(array(' ', "\t"), '', $list);
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$elements = array();
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$attributes = array();
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$chunks = preg_split('/(,|[\n\r]+)/', $list);
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foreach ($chunks as $chunk) {
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if (empty($chunk)) continue;
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// remove TinyMCE element control characters
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if (!strpos($chunk, '[')) {
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$element = $chunk;
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$attr = false;
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} else {
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list($element, $attr) = explode('[', $chunk);
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}
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if ($element !== '*') $elements[$element] = true;
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if (!$attr) continue;
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$attr = substr($attr, 0, strlen($attr) - 1); // remove trailing ]
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$attr = explode('|', $attr);
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foreach ($attr as $key) {
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$attributes["$element.$key"] = true;
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}
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}
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return array($elements, $attributes);
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}
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}
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// vim: et sw=4 sts=4
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