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4275cd1039
In order to tailor certain security checks to the caller that is attempting to load a particular piece of content, we need to be able to attach an appropriate triggering principal to the corresponding requests. Since most HTML content is loaded based on attribute values, that means capturing the subject principal of the caller who sets those attributes, which means making it available to AfterSetAttr hooks. MozReview-Commit-ID: BMDL2Uepg0X --HG-- extra : rebase_source : 25e438c243700a9368c393e40e3a6002d968d6c8
170 lines
5.7 KiB
C++
170 lines
5.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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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#include "mozilla/AsyncEventDispatcher.h"
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#include "mozilla/dom/HTMLMetaElement.h"
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#include "mozilla/dom/HTMLMetaElementBinding.h"
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#include "mozilla/dom/nsCSPService.h"
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#include "nsContentUtils.h"
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#include "nsStyleConsts.h"
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#include "nsIContentSecurityPolicy.h"
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NS_IMPL_NS_NEW_HTML_ELEMENT(Meta)
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namespace mozilla {
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namespace dom {
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HTMLMetaElement::HTMLMetaElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
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: nsGenericHTMLElement(aNodeInfo)
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{
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}
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HTMLMetaElement::~HTMLMetaElement()
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{
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}
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NS_IMPL_ISUPPORTS_INHERITED0(HTMLMetaElement, nsGenericHTMLElement)
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NS_IMPL_ELEMENT_CLONE(HTMLMetaElement)
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nsresult
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HTMLMetaElement::SetMetaReferrer(nsIDocument* aDocument)
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{
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if (!aDocument ||
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!AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::referrer, eIgnoreCase)) {
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return NS_OK;
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}
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nsAutoString content;
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nsresult rv = GetContent(content);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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Element* headElt = aDocument->GetHeadElement();
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if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) {
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content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(content);
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aDocument->SetHeaderData(nsGkAtoms::referrer, content);
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}
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return NS_OK;
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}
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nsresult
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HTMLMetaElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue,
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nsIPrincipal* aSubjectPrincipal,
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bool aNotify)
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{
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if (aNameSpaceID == kNameSpaceID_None) {
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nsIDocument *document = GetUncomposedDoc();
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if (aName == nsGkAtoms::content) {
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if (document && AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
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nsGkAtoms::viewport, eIgnoreCase)) {
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nsAutoString content;
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nsresult rv = GetContent(content);
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NS_ENSURE_SUCCESS(rv, rv);
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nsContentUtils::ProcessViewportInfo(document, content);
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}
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CreateAndDispatchEvent(document, NS_LITERAL_STRING("DOMMetaChanged"));
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}
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// Update referrer policy when it got changed from JS
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nsresult rv = SetMetaReferrer(document);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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}
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return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName, aValue,
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aOldValue, aSubjectPrincipal, aNotify);
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}
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nsresult
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HTMLMetaElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent,
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bool aCompileEventHandlers)
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{
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nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
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aBindingParent,
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aCompileEventHandlers);
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NS_ENSURE_SUCCESS(rv, rv);
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if (aDocument &&
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AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, nsGkAtoms::viewport, eIgnoreCase)) {
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nsAutoString content;
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rv = GetContent(content);
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NS_ENSURE_SUCCESS(rv, rv);
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nsContentUtils::ProcessViewportInfo(aDocument, content);
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}
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if (CSPService::sCSPEnabled && aDocument && !aDocument->IsLoadedAsData() &&
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AttrValueIs(kNameSpaceID_None, nsGkAtoms::httpEquiv, nsGkAtoms::headerCSP, eIgnoreCase)) {
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// only accept <meta http-equiv="Content-Security-Policy" content=""> if it appears
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// in the <head> element.
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Element* headElt = aDocument->GetHeadElement();
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if (headElt && nsContentUtils::ContentIsDescendantOf(this, headElt)) {
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nsAutoString content;
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rv = GetContent(content);
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NS_ENSURE_SUCCESS(rv, rv);
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content = nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(content);
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nsIPrincipal* principal = aDocument->NodePrincipal();
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nsCOMPtr<nsIContentSecurityPolicy> csp;
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nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aDocument);
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principal->EnsureCSP(domDoc, getter_AddRefs(csp));
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if (csp) {
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// Multiple CSPs (delivered through either header of meta tag) need to be
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// joined together, see:
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// https://w3c.github.io/webappsec/specs/content-security-policy/#delivery-html-meta-element
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rv = csp->AppendPolicy(content,
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false, // csp via meta tag can not be report only
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true); // delivered through the meta tag
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NS_ENSURE_SUCCESS(rv, rv);
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aDocument->ApplySettingsFromCSP(false);
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}
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}
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}
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// Referrer Policy spec requires a <meta name="referrer" tag to be in the
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// <head> element.
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rv = SetMetaReferrer(aDocument);
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if (NS_WARN_IF(NS_FAILED(rv))) {
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return rv;
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}
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CreateAndDispatchEvent(aDocument, NS_LITERAL_STRING("DOMMetaAdded"));
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return rv;
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}
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void
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HTMLMetaElement::UnbindFromTree(bool aDeep, bool aNullParent)
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{
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nsCOMPtr<nsIDocument> oldDoc = GetUncomposedDoc();
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CreateAndDispatchEvent(oldDoc, NS_LITERAL_STRING("DOMMetaRemoved"));
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nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
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}
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void
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HTMLMetaElement::CreateAndDispatchEvent(nsIDocument* aDoc,
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const nsAString& aEventName)
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{
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if (!aDoc)
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return;
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RefPtr<AsyncEventDispatcher> asyncDispatcher =
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new AsyncEventDispatcher(this, aEventName, true, true);
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asyncDispatcher->RunDOMEventWhenSafe();
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}
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JSObject*
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HTMLMetaElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return HTMLMetaElementBinding::Wrap(aCx, this, aGivenProto);
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}
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} // namespace dom
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} // namespace mozilla
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