tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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XPCWrapper.cpp (2584B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "xpcprivate.h"
      8 #include "XPCWrapper.h"
      9 #include "WrapperFactory.h"
     10 #include "AccessCheck.h"
     11 
     12 #include "js/PropertyAndElement.h"  // JS_DefineFunction
     13 
     14 using namespace xpc;
     15 using namespace mozilla;
     16 using namespace JS;
     17 
     18 namespace XPCNativeWrapper {
     19 
     20 static inline bool ThrowException(nsresult ex, JSContext* cx) {
     21  XPCThrower::Throw(ex, cx);
     22 
     23  return false;
     24 }
     25 
     26 static bool UnwrapNW(JSContext* cx, unsigned argc, Value* vp) {
     27  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
     28  if (args.length() != 1) {
     29    return ThrowException(NS_ERROR_XPC_NOT_ENOUGH_ARGS, cx);
     30  }
     31 
     32  JS::RootedValue v(cx, args[0]);
     33  if (!v.isObject() || !js::IsCrossCompartmentWrapper(&v.toObject()) ||
     34      !WrapperFactory::AllowWaiver(&v.toObject())) {
     35    args.rval().set(v);
     36    return true;
     37  }
     38 
     39  bool ok = xpc::WrapperFactory::WaiveXrayAndWrap(cx, &v);
     40  NS_ENSURE_TRUE(ok, false);
     41  args.rval().set(v);
     42  return true;
     43 }
     44 
     45 static bool XrayWrapperConstructor(JSContext* cx, unsigned argc, Value* vp) {
     46  JS::CallArgs args = CallArgsFromVp(argc, vp);
     47  if (args.length() == 0) {
     48    return ThrowException(NS_ERROR_XPC_NOT_ENOUGH_ARGS, cx);
     49  }
     50 
     51  if (!args[0].isObject()) {
     52    if (args.isConstructing()) {
     53      return ThrowException(NS_ERROR_XPC_BAD_CONVERT_JS, cx);
     54    }
     55 
     56    args.rval().set(args[0]);
     57    return true;
     58  }
     59 
     60  args.rval().setObject(*js::UncheckedUnwrap(&args[0].toObject()));
     61  return JS_WrapValue(cx, args.rval());
     62 }
     63 // static
     64 bool AttachNewConstructorObject(JSContext* aCx,
     65                                JS::HandleObject aGlobalObject) {
     66  JSAutoRealm ar(aCx, aGlobalObject);
     67  JSFunction* xpcnativewrapper = JS_DefineFunction(
     68      aCx, aGlobalObject, "XPCNativeWrapper", XrayWrapperConstructor, 1,
     69      JSPROP_READONLY | JSPROP_PERMANENT | JSFUN_CONSTRUCTOR);
     70  if (!xpcnativewrapper) {
     71    return false;
     72  }
     73  JS::RootedObject obj(aCx, JS_GetFunctionObject(xpcnativewrapper));
     74  return JS_DefineFunction(aCx, obj, "unwrap", UnwrapNW, 1,
     75                           JSPROP_READONLY | JSPROP_PERMANENT) != nullptr;
     76 }
     77 
     78 }  // namespace XPCNativeWrapper
     79 
     80 namespace XPCWrapper {
     81 
     82 JSObject* UnsafeUnwrapSecurityWrapper(JSObject* obj) {
     83  if (js::IsProxy(obj)) {
     84    return js::UncheckedUnwrap(obj);
     85  }
     86 
     87  return obj;
     88 }
     89 
     90 }  // namespace XPCWrapper