зеркало из https://github.com/mozilla/gecko-dev.git
246 строки
8.1 KiB
C++
246 строки
8.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef nsTreeSanitizer_h_
|
|
#define nsTreeSanitizer_h_
|
|
|
|
#ifdef MOZ_OLD_STYLE
|
|
#include "mozilla/css/StyleRule.h"
|
|
#endif
|
|
#include "nsIPrincipal.h"
|
|
#include "mozilla/dom/Element.h"
|
|
|
|
class nsIContent;
|
|
|
|
/**
|
|
* See the documentation of nsIParserUtils::sanitize for documentation
|
|
* about the default behavior and the configuration options of this sanitizer.
|
|
*/
|
|
class MOZ_STACK_CLASS nsTreeSanitizer {
|
|
|
|
public:
|
|
|
|
/**
|
|
* The constructor.
|
|
*
|
|
* @param aFlags Flags from nsIParserUtils
|
|
*/
|
|
explicit nsTreeSanitizer(uint32_t aFlags = 0);
|
|
|
|
static void InitializeStatics();
|
|
static void ReleaseStatics();
|
|
|
|
/**
|
|
* Sanitizes a disconnected DOM fragment freshly obtained from a parser.
|
|
* The argument must be of type nsINode::eDOCUMENT_FRAGMENT and,
|
|
* consequently, must not be in the document. Furthermore, the fragment
|
|
* must have just come from a parser so that it can't have mutation
|
|
* event listeners set on it.
|
|
*/
|
|
void Sanitize(nsIContent* aFragment);
|
|
|
|
/**
|
|
* Sanitizes a disconnected (not in a docshell) document freshly obtained
|
|
* from a parser. The document must not be embedded in a docshell and must
|
|
* not have had a chance to get mutation event listeners attached to it.
|
|
* The root element must be <html>.
|
|
*/
|
|
void Sanitize(nsIDocument* aDocument);
|
|
|
|
private:
|
|
|
|
/**
|
|
* Whether <style> and style="" are allowed.
|
|
*/
|
|
bool mAllowStyles;
|
|
|
|
/**
|
|
* Whether comment nodes are allowed.
|
|
*/
|
|
bool mAllowComments;
|
|
|
|
/**
|
|
* Whether HTML <font>, <center>, bgcolor="", etc., are dropped.
|
|
*/
|
|
bool mDropNonCSSPresentation;
|
|
|
|
/**
|
|
* Whether to remove forms and form controls (excluding fieldset/legend).
|
|
*/
|
|
bool mDropForms;
|
|
|
|
/**
|
|
* Whether only cid: embeds are allowed.
|
|
*/
|
|
bool mCidEmbedsOnly;
|
|
|
|
/**
|
|
* Whether to drop <img>, <video>, <audio> and <svg>.
|
|
*/
|
|
bool mDropMedia;
|
|
|
|
/**
|
|
* Whether we are sanitizing a full document (as opposed to a fragment).
|
|
*/
|
|
bool mFullDocument;
|
|
|
|
/**
|
|
* Whether we should notify to the console for anything that's stripped.
|
|
*/
|
|
bool mLogRemovals;
|
|
|
|
void SanitizeChildren(nsINode* aRoot);
|
|
|
|
/**
|
|
* Queries if an element must be replaced with its children.
|
|
* @param aNamespace the namespace of the element the question is about
|
|
* @param aLocal the local name of the element the question is about
|
|
* @return true if the element must be replaced with its children and
|
|
* false if the element is to be kept
|
|
*/
|
|
bool MustFlatten(int32_t aNamespace, nsAtom* aLocal);
|
|
|
|
/**
|
|
* Queries if an element including its children must be removed.
|
|
* @param aNamespace the namespace of the element the question is about
|
|
* @param aLocal the local name of the element the question is about
|
|
* @param aElement the element node itself for inspecting attributes
|
|
* @return true if the element and its children must be removed and
|
|
* false if the element is to be kept
|
|
*/
|
|
bool MustPrune(int32_t aNamespace,
|
|
nsAtom* aLocal,
|
|
mozilla::dom::Element* aElement);
|
|
|
|
/**
|
|
* Checks if a given local name (for an attribute) is on the given list
|
|
* of URL attribute names.
|
|
* @param aURLs the list of URL attribute names
|
|
* @param aLocalName the name to search on the list
|
|
* @return true if aLocalName is on the aURLs list and false otherwise
|
|
*/
|
|
bool IsURL(nsStaticAtom** const* aURLs, nsAtom* aLocalName);
|
|
|
|
/**
|
|
* Removes dangerous attributes from the element. If the style attribute
|
|
* is allowed, its value is sanitized. The values of URL attributes are
|
|
* sanitized, except src isn't sanitized when it is allowed to remain
|
|
* potentially dangerous.
|
|
*
|
|
* @param aElement the element whose attributes should be sanitized
|
|
* @param aAllowed the whitelist of permitted local names to use
|
|
* @param aURLs the local names of URL-valued attributes
|
|
* @param aAllowXLink whether XLink attributes are allowed
|
|
* @param aAllowStyle whether the style attribute is allowed
|
|
* @param aAllowDangerousSrc whether to leave the value of the src
|
|
* attribute unsanitized
|
|
*/
|
|
void SanitizeAttributes(mozilla::dom::Element* aElement,
|
|
nsTHashtable<nsRefPtrHashKey<nsAtom>>* aAllowed,
|
|
nsStaticAtom** const* aURLs,
|
|
bool aAllowXLink,
|
|
bool aAllowStyle,
|
|
bool aAllowDangerousSrc);
|
|
|
|
/**
|
|
* Remove the named URL attribute from the element if the URL fails a
|
|
* security check.
|
|
*
|
|
* @param aElement the element whose attribute to possibly modify
|
|
* @param aNamespace the namespace of the URL attribute
|
|
* @param aLocalName the local name of the URL attribute
|
|
* @return true if the attribute was removed and false otherwise
|
|
*/
|
|
bool SanitizeURL(mozilla::dom::Element* aElement,
|
|
int32_t aNamespace,
|
|
nsAtom* aLocalName);
|
|
|
|
/**
|
|
* Checks a style rule for the presence of the 'binding' CSS property and
|
|
* removes that property from the rule.
|
|
*
|
|
* @param aDeclaration The style declaration to check
|
|
* @return true if the rule was modified and false otherwise
|
|
*/
|
|
bool SanitizeStyleDeclaration(mozilla::DeclarationBlock* aDeclaration);
|
|
|
|
/**
|
|
* Parses a style sheet and reserializes it with the 'binding' property
|
|
* removed if it was present.
|
|
*
|
|
* @param aOrigin the original style sheet source
|
|
* @param aSanitized the reserialization without 'binding'; only valid if
|
|
* this method return true
|
|
* @param aDocument the document the style sheet belongs to
|
|
* @param aBaseURI the base URI to use
|
|
* @return true if the 'binding' property was encountered and false
|
|
* otherwise
|
|
*/
|
|
bool SanitizeStyleSheet(const nsAString& aOriginal,
|
|
nsAString& aSanitized,
|
|
nsIDocument* aDocument,
|
|
nsIURI* aBaseURI);
|
|
|
|
/**
|
|
* Removes all attributes from an element node.
|
|
*/
|
|
void RemoveAllAttributes(mozilla::dom::Element* aElement);
|
|
|
|
/**
|
|
* Log a Console Service message to indicate we removed something.
|
|
* If you pass an element and/or attribute, their information will
|
|
* be appended to the message.
|
|
*
|
|
* @param aMessage the basic message to log.
|
|
* @param aDocument the base document we're modifying
|
|
* (used for the error message)
|
|
* @param aElement optional, the element being removed or modified.
|
|
* @param aAttribute optional, the attribute being removed or modified.
|
|
*/
|
|
void LogMessage(const char* aMessage, nsIDocument* aDoc,
|
|
Element* aElement = nullptr, nsAtom* aAttr = nullptr);
|
|
|
|
/**
|
|
* The whitelist of HTML elements.
|
|
*/
|
|
static nsTHashtable<nsRefPtrHashKey<nsAtom>>* sElementsHTML;
|
|
|
|
/**
|
|
* The whitelist of non-presentational HTML attributes.
|
|
*/
|
|
static nsTHashtable<nsRefPtrHashKey<nsAtom>>* sAttributesHTML;
|
|
|
|
/**
|
|
* The whitelist of presentational HTML attributes.
|
|
*/
|
|
static nsTHashtable<nsRefPtrHashKey<nsAtom>>* sPresAttributesHTML;
|
|
|
|
/**
|
|
* The whitelist of SVG elements.
|
|
*/
|
|
static nsTHashtable<nsRefPtrHashKey<nsAtom>>* sElementsSVG;
|
|
|
|
/**
|
|
* The whitelist of SVG attributes.
|
|
*/
|
|
static nsTHashtable<nsRefPtrHashKey<nsAtom>>* sAttributesSVG;
|
|
|
|
/**
|
|
* The whitelist of SVG elements.
|
|
*/
|
|
static nsTHashtable<nsRefPtrHashKey<nsAtom>>* sElementsMathML;
|
|
|
|
/**
|
|
* The whitelist of MathML attributes.
|
|
*/
|
|
static nsTHashtable<nsRefPtrHashKey<nsAtom>>* sAttributesMathML;
|
|
|
|
/**
|
|
* Reusable null principal for URL checks.
|
|
*/
|
|
static nsIPrincipal* sNullPrincipal;
|
|
};
|
|
|
|
#endif // nsTreeSanitizer_h_
|