The Tor Browser: js/xpconnect/wrappers/FilteringWrapper.cpp@6474c204b198 (annotated)

js/xpconnect/wrappers/FilteringWrapper.cpp@6474c204b198 (annotated)

js/xpconnect/wrappers/FilteringWrapper.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim: set ts=8 sts=4 et sw=4 tw=99: */
 /* 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 "FilteringWrapper.h"
 #include "AccessCheck.h"
 #include "ChromeObjectWrapper.h"
 #include "XrayWrapper.h"
 #include "jsapi.h"
 using namespace JS;
 using namespace js;
 namespace xpc {
 template <typename Base, typename Policy>
 FilteringWrapper<Base, Policy>::FilteringWrapper(unsigned flags) : Base(flags)
 {
 }
 template <typename Base, typename Policy>
 FilteringWrapper<Base, Policy>::~FilteringWrapper()
 {
 }
 template <typename Policy>
 static bool
 Filter(JSContext *cx, HandleObject wrapper, AutoIdVector &props)
 {
     size_t w = 0;
     RootedId id(cx);
     for (size_t n = 0; n < props.length(); ++n) {
         id = props[n];
         if (Policy::check(cx, wrapper, id, Wrapper::GET))
             props[w++] = id;
         else if (JS_IsExceptionPending(cx))
             return false;
     }
     props.resize(w);
     return true;
 }
 template <typename Policy>
 static bool
 FilterSetter(JSContext *cx, JSObject *wrapper, jsid id, JS::MutableHandle<JSPropertyDescriptor> desc)
 {
     bool setAllowed = Policy::check(cx, wrapper, id, Wrapper::SET);
     if (!setAllowed) {
         if (JS_IsExceptionPending(cx))
             return false;
         desc.setSetter(nullptr);
     }
     return true;
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::getPropertyDescriptor(JSContext *cx, HandleObject wrapper,
                                                       HandleId id,
                                                       JS::MutableHandle<JSPropertyDescriptor> desc)
 {
     assertEnteredPolicy(cx, wrapper, id, BaseProxyHandler::GET | BaseProxyHandler::SET);
     if (!Base::getPropertyDescriptor(cx, wrapper, id, desc))
         return false;
     return FilterSetter<Policy>(cx, wrapper, id, desc);
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::getOwnPropertyDescriptor(JSContext *cx, HandleObject wrapper,
                                                          HandleId id,
                                                          JS::MutableHandle<JSPropertyDescriptor> desc)
 {
     assertEnteredPolicy(cx, wrapper, id, BaseProxyHandler::GET | BaseProxyHandler::SET);
     if (!Base::getOwnPropertyDescriptor(cx, wrapper, id, desc))
         return false;
     return FilterSetter<Policy>(cx, wrapper, id, desc);
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::getOwnPropertyNames(JSContext *cx, HandleObject wrapper,
                                                     AutoIdVector &props)
 {
     assertEnteredPolicy(cx, wrapper, JSID_VOID, BaseProxyHandler::ENUMERATE);
     return Base::getOwnPropertyNames(cx, wrapper, props) &&
            Filter<Policy>(cx, wrapper, props);
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::enumerate(JSContext *cx, HandleObject wrapper,
                                           AutoIdVector &props)
 {
     assertEnteredPolicy(cx, wrapper, JSID_VOID, BaseProxyHandler::ENUMERATE);
     return Base::enumerate(cx, wrapper, props) &&
            Filter<Policy>(cx, wrapper, props);
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::keys(JSContext *cx, HandleObject wrapper,
                                      AutoIdVector &props)
 {
     assertEnteredPolicy(cx, wrapper, JSID_VOID, BaseProxyHandler::ENUMERATE);
     return Base::keys(cx, wrapper, props) &&
            Filter<Policy>(cx, wrapper, props);
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::iterate(JSContext *cx, HandleObject wrapper,
                                         unsigned flags, MutableHandleValue vp)
 {
     assertEnteredPolicy(cx, wrapper, JSID_VOID, BaseProxyHandler::ENUMERATE);
     // We refuse to trigger the iterator hook across chrome wrappers because
     // we don't know how to censor custom iterator objects. Instead we trigger
     // the default proxy iterate trap, which will ask enumerate() for the list
     // of (censored) ids.
     return js::BaseProxyHandler::iterate(cx, wrapper, flags, vp);
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::nativeCall(JSContext *cx, JS::IsAcceptableThis test,
                                            JS::NativeImpl impl, JS::CallArgs args)
 {
     if (Policy::allowNativeCall(cx, test, impl))
         return Base::Permissive::nativeCall(cx, test, impl, args);
     return Base::Restrictive::nativeCall(cx, test, impl, args);
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::defaultValue(JSContext *cx, HandleObject obj,
                                              JSType hint, MutableHandleValue vp)
 {
     return Base::defaultValue(cx, obj, hint, vp);
 }
 // With our entirely-opaque wrapper, the DefaultValue algorithm throws,
 // causing spurious exceptions. Manually implement something benign.
 template<>
 bool
 FilteringWrapper<CrossCompartmentSecurityWrapper, GentlyOpaque>
                 ::defaultValue(JSContext *cx, HandleObject obj,
                                JSType hint, MutableHandleValue vp)
 {
     JSString *str = JS_NewStringCopyZ(cx, "[Opaque]");
     if (!str)
         return false;
     vp.set(JS::StringValue(str));
     return true;
 }
 template <typename Base, typename Policy>
 bool
 FilteringWrapper<Base, Policy>::enter(JSContext *cx, HandleObject wrapper,
                                       HandleId id, Wrapper::Action act, bool *bp)
 {
     // This is a super ugly hacky to get around Xray Resolve wonkiness.
     //
     // Basically, XPCWN Xrays sometimes call into the Resolve hook of the
     // scriptable helper, and pass the wrapper itself as the object upon which
     // the resolve is happening. Then, special handling happens in
     // XrayWrapper::defineProperty to detect the resolve and redefine the
     // property on the holder. Really, we should just pass the holder itself to
     // NewResolve, but there's too much code in nsDOMClassInfo that assumes this
     // isn't the case (in particular, code expects to be able to look up
     // properties on the object, which doesn't work for the holder). Given that
     // these hooks are going away eventually with the new DOM bindings, let's
     // just hack around this for now.
     if (XrayUtils::IsXrayResolving(cx, wrapper, id)) {
         *bp = true;
         return true;
     }
     if (!Policy::check(cx, wrapper, id, act)) {
         *bp = JS_IsExceptionPending(cx) ? false : Policy::deny(act, id);
         return false;
     }
     *bp = true;
     return true;
 }
 #define XOW FilteringWrapper<SecurityXrayXPCWN, CrossOriginAccessiblePropertiesOnly>
 #define DXOW   FilteringWrapper<SecurityXrayDOM, CrossOriginAccessiblePropertiesOnly>
 #define NNXOW FilteringWrapper<CrossCompartmentSecurityWrapper, Opaque>
 #define NNXOWC FilteringWrapper<CrossCompartmentSecurityWrapper, OpaqueWithCall>
 #define GO FilteringWrapper<CrossCompartmentSecurityWrapper, GentlyOpaque>
 template<> XOW XOW::singleton(0);
 template<> DXOW DXOW::singleton(0);
 template<> NNXOW NNXOW::singleton(0);
 template<> NNXOWC NNXOWC::singleton(0);
 template<> GO GO::singleton(0);
 template class XOW;
 template class DXOW;
 template class NNXOW;
 template class NNXOWC;
 template class ChromeObjectWrapperBase;
 template class GO;
 }

The Tor Browser / annotate

js/xpconnect/wrappers/FilteringWrapper.cpp@6474c204b198 (annotated)

js/xpconnect/wrappers/FilteringWrapper.cpp