From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 dom/base/WindowNamedPropertiesHandler.cpp | 325 ++++++++++++++++++++++++++++++
 1 file changed, 325 insertions(+)
 create mode 100644 dom/base/WindowNamedPropertiesHandler.cpp

(limited to 'dom/base/WindowNamedPropertiesHandler.cpp')

diff --git a/dom/base/WindowNamedPropertiesHandler.cpp b/dom/base/WindowNamedPropertiesHandler.cpp
new file mode 100644
index 000000000..c0b71dab3
--- /dev/null
+++ b/dom/base/WindowNamedPropertiesHandler.cpp
@@ -0,0 +1,325 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WindowNamedPropertiesHandler.h"
+#include "mozilla/dom/EventTargetBinding.h"
+#include "mozilla/dom/WindowBinding.h"
+#include "nsContentUtils.h"
+#include "nsDOMClassInfo.h"
+#include "nsDOMWindowList.h"
+#include "nsGlobalWindow.h"
+#include "nsHTMLDocument.h"
+#include "nsJSUtils.h"
+#include "xpcprivate.h"
+
+namespace mozilla {
+namespace dom {
+
+static bool
+ShouldExposeChildWindow(nsString& aNameBeingResolved, nsPIDOMWindowOuter* aChild)
+{
+  Element* e = aChild->GetFrameElementInternal();
+  if (e && e->IsInShadowTree()) {
+    return false;
+  }
+
+  // If we're same-origin with the child, go ahead and expose it.
+  nsCOMPtr<nsIScriptObjectPrincipal> sop = do_QueryInterface(aChild);
+  NS_ENSURE_TRUE(sop, false);
+  if (nsContentUtils::SubjectPrincipal()->Equals(sop->GetPrincipal())) {
+    return true;
+  }
+
+  // If we're not same-origin, expose it _only_ if the name of the browsing
+  // context matches the 'name' attribute of the frame element in the parent.
+  // The motivations behind this heuristic are worth explaining here.
+  //
+  // Historically, all UAs supported global named access to any child browsing
+  // context (that is to say, window.dolske returns a child frame where either
+  // the "name" attribute on the frame element was set to "dolske", or where
+  // the child explicitly set window.name = "dolske").
+  //
+  // This is problematic because it allows possibly-malicious and unrelated
+  // cross-origin subframes to pollute the global namespace of their parent in
+  // unpredictable ways (see bug 860494). This is also problematic for browser
+  // engines like Servo that want to run cross-origin script on different
+  // threads.
+  //
+  // The naive solution here would be to filter out any cross-origin subframes
+  // obtained when doing named lookup in global scope. But that is unlikely to
+  // be web-compatible, since it will break named access for consumers that do
+  // <iframe name="dolske" src="http://cross-origin.com/sadtrombone.html"> and
+  // expect to be able to access the cross-origin subframe via named lookup on
+  // the global.
+  //
+  // The optimal behavior would be to do the following:
+  // (a) Look for any child browsing context with name="dolske".
+  // (b) If the result is cross-origin, null it out.
+  // (c) If we have null, look for a frame element whose 'name' attribute is
+  //     "dolske".
+  //
+  // Unfortunately, (c) would require some engineering effort to be performant
+  // in Gecko, and probably in other UAs as well. So we go with a simpler
+  // approximation of the above. This approximation will only break sites that
+  // rely on their cross-origin subframes setting window.name to a known value,
+  // which is unlikely to be very common. And while it does introduce a
+  // dependency on cross-origin state when doing global lookups, it doesn't
+  // allow the child to arbitrarily pollute the parent namespace, and requires
+  // cross-origin communication only in a limited set of cases that can be
+  // computed independently by the parent.
+  return e && e->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
+                             aNameBeingResolved, eCaseMatters);
+}
+
+bool
+WindowNamedPropertiesHandler::getOwnPropDescriptor(JSContext* aCx,
+                                                   JS::Handle<JSObject*> aProxy,
+                                                   JS::Handle<jsid> aId,
+                                                   bool /* unused */,
+                                                   JS::MutableHandle<JS::PropertyDescriptor> aDesc)
+                                                   const
+{
+  if (!JSID_IS_STRING(aId)) {
+    // Nothing to do if we're resolving a non-string property.
+    return true;
+  }
+
+  bool hasOnPrototype;
+  if (!HasPropertyOnPrototype(aCx, aProxy, aId, &hasOnPrototype)) {
+    return false;
+  }
+  if (hasOnPrototype) {
+    return true;
+  }
+
+  nsAutoJSString str;
+  if (!str.init(aCx, JSID_TO_STRING(aId))) {
+    return false;
+  }
+
+  if(str.IsEmpty()) {
+    return true;
+  }
+
+  // Grab the DOM window.
+  JS::Rooted<JSObject*> global(aCx, JS_GetGlobalForObject(aCx, aProxy));
+  nsGlobalWindow* win = xpc::WindowOrNull(global);
+  if (win->Length() > 0) {
+    nsCOMPtr<nsPIDOMWindowOuter> childWin = win->GetChildWindow(str);
+    if (childWin && ShouldExposeChildWindow(str, childWin)) {
+      // We found a subframe of the right name. Shadowing via |var foo| in
+      // global scope is still allowed, since |var| only looks up |own|
+      // properties. But unqualified shadowing will fail, per-spec.
+      JS::Rooted<JS::Value> v(aCx);
+      if (!WrapObject(aCx, childWin, &v)) {
+        return false;
+      }
+      FillPropertyDescriptor(aDesc, aProxy, 0, v);
+      return true;
+    }
+  }
+
+  // The rest of this function is for HTML documents only.
+  nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(win->GetExtantDoc());
+  if (!htmlDoc) {
+    return true;
+  }
+  nsHTMLDocument* document = static_cast<nsHTMLDocument*>(htmlDoc.get());
+
+  Element* element = document->GetElementById(str);
+  if (element) {
+    JS::Rooted<JS::Value> v(aCx);
+    if (!WrapObject(aCx, element, &v)) {
+      return false;
+    }
+    FillPropertyDescriptor(aDesc, aProxy, 0, v);
+    return true;
+  }
+
+  nsWrapperCache* cache;
+  nsISupports* result = document->ResolveName(str, &cache);
+  if (!result) {
+    return true;
+  }
+
+  JS::Rooted<JS::Value> v(aCx);
+  if (!WrapObject(aCx, result, cache, nullptr, &v)) {
+    return false;
+  }
+  FillPropertyDescriptor(aDesc, aProxy, 0, v);
+  return true;
+}
+
+bool
+WindowNamedPropertiesHandler::defineProperty(JSContext* aCx,
+                                             JS::Handle<JSObject*> aProxy,
+                                             JS::Handle<jsid> aId,
+                                             JS::Handle<JS::PropertyDescriptor> aDesc,
+                                             JS::ObjectOpResult &result) const
+{
+  ErrorResult rv;
+  rv.ThrowTypeError<MSG_DEFINEPROPERTY_ON_GSP>();
+  rv.MaybeSetPendingException(aCx);
+  return false;
+}
+
+bool
+WindowNamedPropertiesHandler::ownPropNames(JSContext* aCx,
+                                           JS::Handle<JSObject*> aProxy,
+                                           unsigned flags,
+                                           JS::AutoIdVector& aProps) const
+{
+  if (!(flags & JSITER_HIDDEN)) {
+    // None of our named properties are enumerable.
+    return true;
+  }
+
+  // Grab the DOM window.
+  nsGlobalWindow* win = xpc::WindowOrNull(JS_GetGlobalForObject(aCx, aProxy));
+  nsTArray<nsString> names;
+  // The names live on the outer window, which might be null
+  nsGlobalWindow* outer = win->GetOuterWindowInternal();
+  if (outer) {
+    nsDOMWindowList* childWindows = outer->GetWindowList();
+    if (childWindows) {
+      uint32_t length = childWindows->GetLength();
+      for (uint32_t i = 0; i < length; ++i) {
+        nsCOMPtr<nsIDocShellTreeItem> item =
+          childWindows->GetDocShellTreeItemAt(i);
+        // This is a bit silly, since we could presumably just do
+        // item->GetWindow().  But it's not obvious whether this does the same
+        // thing as GetChildWindow() with the item's name (due to the complexity
+        // of FindChildWithName).  Since GetChildWindow is what we use in
+        // getOwnPropDescriptor, let's try to be consistent.
+        nsString name;
+        item->GetName(name);
+        if (!names.Contains(name)) {
+          // Make sure we really would expose it from getOwnPropDescriptor.
+          nsCOMPtr<nsPIDOMWindowOuter> childWin = win->GetChildWindow(name);
+          if (childWin && ShouldExposeChildWindow(name, childWin)) {
+            names.AppendElement(name);
+          }
+        }
+      }
+    }
+  }
+  if (!AppendNamedPropertyIds(aCx, aProxy, names, false, aProps)) {
+    return false;
+  }
+
+  names.Clear();
+  nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(win->GetExtantDoc());
+  if (!htmlDoc) {
+    return true;
+  }
+  nsHTMLDocument* document = static_cast<nsHTMLDocument*>(htmlDoc.get());
+  // Document names are enumerable, so we want to get them no matter what flags
+  // is.
+  document->GetSupportedNames(names);
+
+  JS::AutoIdVector docProps(aCx);
+  if (!AppendNamedPropertyIds(aCx, aProxy, names, false, docProps)) {
+    return false;
+  }
+
+  return js::AppendUnique(aCx, aProps, docProps);
+}
+
+bool
+WindowNamedPropertiesHandler::delete_(JSContext* aCx,
+                                      JS::Handle<JSObject*> aProxy,
+                                      JS::Handle<jsid> aId,
+                                      JS::ObjectOpResult &aResult) const
+{
+  return aResult.failCantDeleteWindowNamedProperty();
+}
+
+static bool
+ResolveWindowNamedProperty(JSContext* aCx, JS::Handle<JSObject*> aWrapper,
+                           JS::Handle<JSObject*> aObj, JS::Handle<jsid> aId,
+                           JS::MutableHandle<JS::PropertyDescriptor> aDesc)
+{
+  {
+    JSAutoCompartment ac(aCx, aObj);
+    if (!js::GetProxyHandler(aObj)->getOwnPropertyDescriptor(aCx, aObj, aId,
+                                                             aDesc)) {
+      return false;
+    }
+  }
+
+  if (aDesc.object()) {
+    aDesc.object().set(aWrapper);
+
+    return JS_WrapPropertyDescriptor(aCx, aDesc);
+  }
+
+  return true;
+}
+
+static bool
+EnumerateWindowNamedProperties(JSContext* aCx, JS::Handle<JSObject*> aWrapper,
+                               JS::Handle<JSObject*> aObj,
+                               JS::AutoIdVector& aProps)
+{
+  JSAutoCompartment ac(aCx, aObj);
+  return js::GetProxyHandler(aObj)->ownPropertyKeys(aCx, aObj, aProps);
+}
+
+const NativePropertyHooks sWindowNamedPropertiesNativePropertyHooks[] = { {
+  ResolveWindowNamedProperty,
+  EnumerateWindowNamedProperties,
+  nullptr,
+  { nullptr, nullptr },
+  prototypes::id::_ID_Count,
+  constructors::id::_ID_Count,
+  nullptr
+} };
+
+static const DOMIfaceAndProtoJSClass WindowNamedPropertiesClass = {
+  PROXY_CLASS_DEF("WindowProperties",
+                  JSCLASS_IS_DOMIFACEANDPROTOJSCLASS),
+  eNamedPropertiesObject,
+  false,
+  prototypes::id::_ID_Count,
+  0,
+  sWindowNamedPropertiesNativePropertyHooks,
+  "[object WindowProperties]",
+  EventTargetBinding::GetProtoObject
+};
+
+// static
+JSObject*
+WindowNamedPropertiesHandler::Create(JSContext* aCx,
+                                     JS::Handle<JSObject*> aProto)
+{
+  // Note: since the scope polluter proxy lives on the window's prototype
+  // chain, it needs a singleton type to avoid polluting type information
+  // for properties on the window.
+  js::ProxyOptions options;
+  options.setSingleton(true);
+  options.setClass(&WindowNamedPropertiesClass.mBase);
+
+  JS::Rooted<JSObject*> gsp(aCx);
+  gsp = js::NewProxyObject(aCx, WindowNamedPropertiesHandler::getInstance(),
+                           JS::NullHandleValue, aProto,
+                           options);
+  if (!gsp) {
+    return nullptr;
+  }
+
+  bool succeeded;
+  if (!JS_SetImmutablePrototype(aCx, gsp, &succeeded)) {
+    return nullptr;
+  }
+  MOZ_ASSERT(succeeded,
+             "errors making the [[Prototype]] of the named properties object "
+             "immutable should have been JSAPI failures, not !succeeded");
+
+  return gsp;
+}
+
+} // namespace dom
+} // namespace mozilla
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