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116 lines
4.1 KiB
C++
116 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 sw=4 et tw=99 ft=cpp:
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*
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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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#ifndef __AccessCheck_h__
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#define __AccessCheck_h__
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#include "jswrapper.h"
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#include "js/Id.h"
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class nsIPrincipal;
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namespace xpc {
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class AccessCheck {
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public:
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static bool subsumes(JSCompartment *a, JSCompartment *b);
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static bool subsumes(JSObject *a, JSObject *b);
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static bool wrapperSubsumes(JSObject *wrapper);
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static bool subsumesIgnoringDomain(JSCompartment *a, JSCompartment *b);
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static bool isChrome(JSCompartment *compartment);
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static bool isChrome(JSObject *obj);
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static bool callerIsChrome();
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static nsIPrincipal *getPrincipal(JSCompartment *compartment);
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static bool isCrossOriginAccessPermitted(JSContext *cx, JSObject *obj, jsid id,
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js::Wrapper::Action act);
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static bool needsSystemOnlyWrapper(JSObject *obj);
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};
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struct Policy {
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};
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// This policy only allows calling the underlying callable. All other operations throw.
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struct Opaque : public Policy {
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static bool check(JSContext *cx, JSObject *wrapper, jsid id, js::Wrapper::Action act) {
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return act == js::Wrapper::CALL;
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}
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static bool deny(js::Wrapper::Action act, JS::HandleId id) {
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return false;
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}
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static bool allowNativeCall(JSContext *cx, JS::IsAcceptableThis test, JS::NativeImpl impl)
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{
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return false;
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}
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};
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// This policy is designed to protect privileged callers from untrusted non-
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// Xrayable objects. Nothing is allowed, and nothing throws.
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struct GentlyOpaque : public Policy {
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static bool check(JSContext *cx, JSObject *wrapper, jsid id, js::Wrapper::Action act) {
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return false;
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}
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static bool deny(js::Wrapper::Action act, JS::HandleId id) {
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return true;
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}
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static bool allowNativeCall(JSContext *cx, JS::IsAcceptableThis test, JS::NativeImpl impl)
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{
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// We allow nativeCall here because the alternative is throwing (which
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// happens in SecurityWrapper::nativeCall), which we don't want. There's
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// unlikely to be too much harm to letting this through, because this
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// wrapper is only used to wrap less-privileged objects in more-privileged
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// scopes, so unwrapping here only drops privileges.
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return true;
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}
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};
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// This policy only permits access to properties that are safe to be used
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// across origins.
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struct CrossOriginAccessiblePropertiesOnly : public Policy {
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static bool check(JSContext *cx, JSObject *wrapper, jsid id, js::Wrapper::Action act) {
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return AccessCheck::isCrossOriginAccessPermitted(cx, wrapper, id, act);
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}
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static bool deny(js::Wrapper::Action act, JS::HandleId id) {
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// Silently fail for enumerate-like operations.
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if (act == js::Wrapper::GET && id == JSID_VOIDHANDLE)
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return true;
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return false;
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}
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static bool allowNativeCall(JSContext *cx, JS::IsAcceptableThis test, JS::NativeImpl impl)
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{
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return false;
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}
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};
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// This policy only permits access to properties if they appear in the
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// objects exposed properties list.
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struct ExposedPropertiesOnly : public Policy {
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static bool check(JSContext *cx, JSObject *wrapper, jsid id, js::Wrapper::Action act);
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static bool deny(js::Wrapper::Action act, JS::HandleId id) {
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// Fail silently for GETs.
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return act == js::Wrapper::GET;
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}
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static bool allowNativeCall(JSContext *cx, JS::IsAcceptableThis test, JS::NativeImpl impl);
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};
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// Components specific policy
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struct ComponentsObjectPolicy : public Policy {
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static bool check(JSContext *cx, JSObject *wrapper, jsid id, js::Wrapper::Action act);
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static bool deny(js::Wrapper::Action act, JS::HandleId id) {
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return false;
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}
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static bool allowNativeCall(JSContext *cx, JS::IsAcceptableThis test, JS::NativeImpl impl) {
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return false;
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}
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};
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}
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#endif /* __AccessCheck_h__ */
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