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1f8589ab7c
The various AtomsTables in nsTreeSanitizer only contain static atoms. Knowing this, we can optimize things: - They can contain raw nsStaticAtom pointers instead of refcounted nsAtom pointers. - When looking up, we can/must first check if the atom we are looking for is static. If not, we know it can't be in the table. This is done by the new Contains() method. This change also lets us add more `const` to various places that interact with the tables. MozReview-Commit-ID: EFxWN2GU78L --HG-- extra : rebase_source : f2a0bdbb4c5179dd396476263e6a6b57adb13360
259 lines
8.3 KiB
C++
259 lines
8.3 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(nsIDocument* 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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* 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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{
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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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{}
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bool Contains(nsAtom* aAtom)
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{
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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,
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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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* 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 the whitelist of permitted local names to use
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* @param aURLs the local names of URL-valued attributes
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* @param aAllowXLink whether XLink attributes are allowed
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* @param aAllowStyle whether the style attribute is allowed
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* @param aAllowDangerousSrc whether to leave the value of the src
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* attribute unsanitized
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*/
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void SanitizeAttributes(mozilla::dom::Element* aElement,
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AtomsTable* aAllowed,
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const nsStaticAtom* const* aURLs,
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bool aAllowXLink,
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bool aAllowStyle,
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bool aAllowDangerousSrc);
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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,
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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 aOrigin the original style sheet source
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* @param aSanitized the reserialization without 'binding'; only valid if
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* this method return true
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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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* @return true if the 'binding' property was encountered and false
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* otherwise
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*/
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bool SanitizeStyleSheet(const nsAString& aOriginal,
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nsAString& aSanitized,
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nsIDocument* aDocument,
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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, nsIDocument* aDoc,
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Element* aElement = nullptr, 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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