forked from mirrors/gecko-dev
fe173632c7
This avoids the mutation due to the different serialization in some cases. Differential Revision: https://phabricator.services.mozilla.com/D56732 --HG-- extra : moz-landing-system : lando
258 lines
7.8 KiB
C++
258 lines
7.8 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsTreeSanitizer_h_
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#define nsTreeSanitizer_h_
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#include "nsIPrincipal.h"
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#include "mozilla/dom/Element.h"
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class nsIContent;
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/**
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* See the documentation of nsIParserUtils::sanitize for documentation
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* about the default behavior and the configuration options of this sanitizer.
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*/
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class MOZ_STACK_CLASS nsTreeSanitizer {
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public:
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/**
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* The constructor.
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*
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* @param aFlags Flags from nsIParserUtils
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*/
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explicit nsTreeSanitizer(uint32_t aFlags = 0);
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static void InitializeStatics();
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static void ReleaseStatics();
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/**
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* Sanitizes a disconnected DOM fragment freshly obtained from a parser.
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* The fragment must have just come from a parser so that it can't have
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* mutation event listeners set on it.
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*/
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void Sanitize(mozilla::dom::DocumentFragment* aFragment);
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/**
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* Sanitizes a disconnected (not in a docshell) document freshly obtained
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* from a parser. The document must not be embedded in a docshell and must
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* not have had a chance to get mutation event listeners attached to it.
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* The root element must be <html>.
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*/
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void Sanitize(mozilla::dom::Document* aDocument);
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private:
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/**
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* Whether <style> and style="" are allowed.
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*/
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bool mAllowStyles;
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/**
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* Whether comment nodes are allowed.
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*/
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bool mAllowComments;
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/**
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* Whether HTML <font>, <center>, bgcolor="", etc., are dropped.
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*/
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bool mDropNonCSSPresentation;
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/**
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* Whether to remove forms and form controls (excluding fieldset/legend).
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*/
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bool mDropForms;
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/**
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* Whether only cid: embeds are allowed.
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*/
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bool mCidEmbedsOnly;
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/**
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* Whether to drop <img>, <video>, <audio> and <svg>.
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*/
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bool mDropMedia;
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/**
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* Whether we are sanitizing a full document (as opposed to a fragment).
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*/
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bool mFullDocument;
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/**
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* Whether we should notify to the console for anything that's stripped.
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*/
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bool mLogRemovals;
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/**
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* Whether we should remove CSS conditional rules, no other changes.
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*/
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bool mOnlyConditionalCSS;
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/**
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* We have various tables of static atoms for elements and attributes.
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*/
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class AtomsTable : public nsTHashtable<nsPtrHashKey<const nsStaticAtom>> {
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public:
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explicit AtomsTable(uint32_t aLength)
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: nsTHashtable<nsPtrHashKey<const nsStaticAtom>>(aLength) {}
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bool Contains(nsAtom* aAtom) {
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// Because this table only contains static atoms, if aAtom isn't
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// static we can immediately fail.
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return aAtom->IsStatic() && GetEntry(aAtom->AsStatic());
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}
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};
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void SanitizeChildren(nsINode* aRoot);
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/**
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* Queries if an element must be replaced with its children.
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* @param aNamespace the namespace of the element the question is about
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* @param aLocal the local name of the element the question is about
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* @return true if the element must be replaced with its children and
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* false if the element is to be kept
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*/
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bool MustFlatten(int32_t aNamespace, nsAtom* aLocal);
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/**
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* Queries if an element including its children must be removed.
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* @param aNamespace the namespace of the element the question is about
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* @param aLocal the local name of the element the question is about
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* @param aElement the element node itself for inspecting attributes
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* @return true if the element and its children must be removed and
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* false if the element is to be kept
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*/
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bool MustPrune(int32_t aNamespace, nsAtom* aLocal,
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mozilla::dom::Element* aElement);
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/**
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* Checks if a given local name (for an attribute) is on the given list
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* of URL attribute names.
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* @param aURLs the list of URL attribute names
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* @param aLocalName the name to search on the list
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* @return true if aLocalName is on the aURLs list and false otherwise
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*/
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bool IsURL(const nsStaticAtom* const* aURLs, nsAtom* aLocalName);
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/**
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* Struct for what attributes and their values are allowed.
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*/
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struct AllowedAttributes {
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// The whitelist of permitted local names to use.
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AtomsTable* mNames = nullptr;
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// The local names of URL-valued attributes for URL checking.
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const nsStaticAtom* const* mURLs = nullptr;
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// Whether XLink attributes are allowed.
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bool mXLink = false;
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// Whether the style attribute is allowed.
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bool mStyle = false;
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// Whether to leave the value of the src attribute unsanitized.
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bool mDangerousSrc = false;
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};
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/**
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* Removes dangerous attributes from the element. If the style attribute
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* is allowed, its value is sanitized. The values of URL attributes are
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* sanitized, except src isn't sanitized when it is allowed to remain
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* potentially dangerous.
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*
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* @param aElement the element whose attributes should be sanitized
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* @param aAllowed options for sanitizing attributes
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*/
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void SanitizeAttributes(mozilla::dom::Element* aElement,
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AllowedAttributes aAllowed);
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/**
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* Remove the named URL attribute from the element if the URL fails a
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* security check.
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*
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* @param aElement the element whose attribute to possibly modify
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* @param aNamespace the namespace of the URL attribute
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* @param aLocalName the local name of the URL attribute
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* @return true if the attribute was removed and false otherwise
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*/
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bool SanitizeURL(mozilla::dom::Element* aElement, int32_t aNamespace,
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nsAtom* aLocalName);
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/**
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* Checks a style rule for the presence of the 'binding' CSS property and
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* removes that property from the rule.
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*
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* @param aDeclaration The style declaration to check
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* @return true if the rule was modified and false otherwise
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*/
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bool SanitizeStyleDeclaration(mozilla::DeclarationBlock* aDeclaration);
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/**
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* Parses a style sheet and reserializes it with the 'binding' property
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* removed if it was present.
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*
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* @param aOriginal the original style sheet source
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* @param aSanitized the reserialization without dangerous CSS.
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* @param aDocument the document the style sheet belongs to
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* @param aBaseURI the base URI to use
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*/
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void SanitizeStyleSheet(const nsAString& aOriginal, nsAString& aSanitized,
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mozilla::dom::Document* aDocument, nsIURI* aBaseURI);
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/**
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* Removes all attributes from an element node.
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*/
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void RemoveAllAttributes(mozilla::dom::Element* aElement);
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/**
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* Log a Console Service message to indicate we removed something.
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* If you pass an element and/or attribute, their information will
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* be appended to the message.
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*
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* @param aMessage the basic message to log.
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* @param aDocument the base document we're modifying
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* (used for the error message)
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* @param aElement optional, the element being removed or modified.
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* @param aAttribute optional, the attribute being removed or modified.
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*/
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void LogMessage(const char* aMessage, mozilla::dom::Document* aDoc,
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mozilla::dom::Element* aElement = nullptr,
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nsAtom* aAttr = nullptr);
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/**
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* The whitelist of HTML elements.
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*/
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static AtomsTable* sElementsHTML;
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/**
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* The whitelist of non-presentational HTML attributes.
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*/
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static AtomsTable* sAttributesHTML;
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/**
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* The whitelist of presentational HTML attributes.
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*/
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static AtomsTable* sPresAttributesHTML;
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/**
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* The whitelist of SVG elements.
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*/
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static AtomsTable* sElementsSVG;
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/**
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* The whitelist of SVG attributes.
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*/
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static AtomsTable* sAttributesSVG;
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/**
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* The whitelist of SVG elements.
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*/
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static AtomsTable* sElementsMathML;
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/**
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* The whitelist of MathML attributes.
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*/
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static AtomsTable* sAttributesMathML;
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/**
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* Reusable null principal for URL checks.
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*/
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static nsIPrincipal* sNullPrincipal;
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};
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#endif // nsTreeSanitizer_h_
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