234 lines
7.6 KiB
C++
234 lines
7.6 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 "mozilla/css/StyleRule.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 argument must be of type nsINode::eDOCUMENT_FRAGMENT and,
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* consequently, must not be in the document. Furthermore, the fragment
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* must have just come from a parser so that it can't have mutation
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* event listeners set on it.
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*/
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void Sanitize(nsIContent* 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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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, nsIAtom* 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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nsIAtom* 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(nsIAtom*** aURLs, nsIAtom* 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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nsTHashtable<nsISupportsHashKey>* aAllowed,
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nsIAtom*** 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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nsIAtom* 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 and reserializes in case the
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* property was found.
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*
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* @param aDeclaration The style declaration to check
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* @param aRuleText the serialized mutated rule if the method returns true
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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::css::Declaration* aDeclaration,
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nsAutoString& aRuleText);
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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(nsIContent* aElement);
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/**
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* Removes all attributes from the descendants of an element but not from
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* the element itself.
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*/
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void RemoveAllAttributesFromDescendants(mozilla::dom::Element* aElement);
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/**
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* The whitelist of HTML elements.
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*/
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static nsTHashtable<nsISupportsHashKey>* 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 nsTHashtable<nsISupportsHashKey>* sAttributesHTML;
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/**
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* The whitelist of presentational HTML attributes.
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*/
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static nsTHashtable<nsISupportsHashKey>* sPresAttributesHTML;
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/**
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* The whitelist of SVG elements.
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*/
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static nsTHashtable<nsISupportsHashKey>* sElementsSVG;
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/**
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* The whitelist of SVG attributes.
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*/
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static nsTHashtable<nsISupportsHashKey>* sAttributesSVG;
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/**
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* The whitelist of SVG elements.
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*/
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static nsTHashtable<nsISupportsHashKey>* sElementsMathML;
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/**
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* The whitelist of MathML attributes.
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*/
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static nsTHashtable<nsISupportsHashKey>* 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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