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212 lines
7.7 KiB
C++
212 lines
7.7 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is HTML/SVG/MathML sanitizer code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Henri Sivonen <hsivonen@iki.fi>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsTreeSanitizer_h_
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#define nsTreeSanitizer_h_
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#include "nsIContent.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 NS_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 aAllowStyles Whether to allow <style> and style=""
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* @param aAllowComments Whether to allow comment nodes
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*/
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nsTreeSanitizer(bool aAllowStyles, bool aAllowComments);
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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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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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* 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(PRInt32 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(PRInt32 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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PRInt32 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 aRule The style rule 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 SanitizeStyleRule(mozilla::css::StyleRule* aRule,
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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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* 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 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 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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