mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
e9c4522522
As soon as Date is on Xrays, this stuff won't work anyway. Henceforth, content access to chrome Date objects is forbidden, and APIs should use something like |new contentWindow.Date()| for any Date object they wish to expose to content.
362 lines
10 KiB
C++
362 lines
10 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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#include "AccessCheck.h"
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#include "nsJSPrincipals.h"
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#include "nsGlobalWindow.h"
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#include "XPCWrapper.h"
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#include "XrayWrapper.h"
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#include "jsfriendapi.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/WindowBinding.h"
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#include "nsIDOMWindowCollection.h"
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#include "nsJSUtils.h"
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using namespace mozilla;
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using namespace JS;
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using namespace js;
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namespace xpc {
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nsIPrincipal *
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GetCompartmentPrincipal(JSCompartment *compartment)
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{
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return nsJSPrincipals::get(JS_GetCompartmentPrincipals(compartment));
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}
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nsIPrincipal *
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GetObjectPrincipal(JSObject *obj)
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{
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return GetCompartmentPrincipal(js::GetObjectCompartment(obj));
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}
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// Does the principal of compartment a subsume the principal of compartment b?
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bool
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AccessCheck::subsumes(JSCompartment *a, JSCompartment *b)
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{
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nsIPrincipal *aprin = GetCompartmentPrincipal(a);
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nsIPrincipal *bprin = GetCompartmentPrincipal(b);
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return aprin->Subsumes(bprin);
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}
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bool
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AccessCheck::subsumes(JSObject *a, JSObject *b)
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{
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return subsumes(js::GetObjectCompartment(a), js::GetObjectCompartment(b));
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}
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// Same as above, but considering document.domain.
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bool
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AccessCheck::subsumesConsideringDomain(JSCompartment *a, JSCompartment *b)
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{
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nsIPrincipal *aprin = GetCompartmentPrincipal(a);
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nsIPrincipal *bprin = GetCompartmentPrincipal(b);
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return aprin->SubsumesConsideringDomain(bprin);
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}
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// Does the compartment of the wrapper subsumes the compartment of the wrappee?
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bool
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AccessCheck::wrapperSubsumes(JSObject *wrapper)
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{
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MOZ_ASSERT(js::IsWrapper(wrapper));
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JSObject *wrapped = js::UncheckedUnwrap(wrapper);
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return AccessCheck::subsumes(js::GetObjectCompartment(wrapper),
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js::GetObjectCompartment(wrapped));
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}
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bool
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AccessCheck::isChrome(JSCompartment *compartment)
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{
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nsIScriptSecurityManager *ssm = XPCWrapper::GetSecurityManager();
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if (!ssm) {
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return false;
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}
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bool privileged;
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nsIPrincipal *principal = GetCompartmentPrincipal(compartment);
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return NS_SUCCEEDED(ssm->IsSystemPrincipal(principal, &privileged)) && privileged;
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}
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bool
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AccessCheck::isChrome(JSObject *obj)
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{
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return isChrome(js::GetObjectCompartment(obj));
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}
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bool
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AccessCheck::callerIsChrome()
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{
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nsIScriptSecurityManager *ssm = XPCWrapper::GetSecurityManager();
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if (!ssm)
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return false;
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bool subjectIsSystem;
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nsresult rv = ssm->SubjectPrincipalIsSystem(&subjectIsSystem);
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return NS_SUCCEEDED(rv) && subjectIsSystem;
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}
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nsIPrincipal *
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AccessCheck::getPrincipal(JSCompartment *compartment)
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{
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return GetCompartmentPrincipal(compartment);
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}
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#define NAME(ch, str, cases) \
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case ch: if (!strcmp(name, str)) switch (propChars[0]) { cases }; break;
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#define PROP(ch, actions) case ch: { actions }; break;
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#define RW(str) if (JS_FlatStringEqualsAscii(prop, str)) return true;
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#define R(str) if (!set && JS_FlatStringEqualsAscii(prop, str)) return true;
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#define W(str) if (set && JS_FlatStringEqualsAscii(prop, str)) return true;
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// Hardcoded policy for cross origin property access. This was culled from the
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// preferences file (all.js). We don't want users to overwrite highly sensitive
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// security policies.
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static bool
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IsPermitted(const char *name, JSFlatString *prop, bool set)
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{
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size_t propLength;
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const jschar *propChars =
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JS_GetInternedStringCharsAndLength(JS_FORGET_STRING_FLATNESS(prop), &propLength);
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if (!propLength)
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return false;
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switch (name[0]) {
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NAME('L', "Location",
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PROP('h', W("href"))
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PROP('r', R("replace")))
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case 'W':
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if (!strcmp(name, "Window"))
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return dom::WindowBinding::IsPermitted(prop, propChars[0], set);
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break;
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}
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return false;
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}
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#undef NAME
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#undef RW
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#undef R
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#undef W
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static bool
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IsFrameId(JSContext *cx, JSObject *objArg, jsid idArg)
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{
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RootedObject obj(cx, objArg);
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RootedId id(cx, idArg);
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obj = JS_ObjectToInnerObject(cx, obj);
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MOZ_ASSERT(!js::IsWrapper(obj));
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nsGlobalWindow* win = WindowOrNull(obj);
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if (!win) {
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return false;
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}
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nsCOMPtr<nsIDOMWindowCollection> col;
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win->GetFrames(getter_AddRefs(col));
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if (!col) {
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return false;
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}
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nsCOMPtr<nsIDOMWindow> domwin;
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if (JSID_IS_INT(id)) {
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col->Item(JSID_TO_INT(id), getter_AddRefs(domwin));
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} else if (JSID_IS_STRING(id)) {
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col->NamedItem(nsDependentJSString(id), getter_AddRefs(domwin));
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}
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return domwin != nullptr;
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}
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static bool
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IsWindow(const char *name)
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{
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return name[0] == 'W' && !strcmp(name, "Window");
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}
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bool
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AccessCheck::isCrossOriginAccessPermitted(JSContext *cx, JSObject *wrapperArg, jsid idArg,
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Wrapper::Action act)
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{
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if (!XPCWrapper::GetSecurityManager())
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return true;
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if (act == Wrapper::CALL)
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return false;
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RootedId id(cx, idArg);
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RootedObject wrapper(cx, wrapperArg);
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RootedObject obj(cx, Wrapper::wrappedObject(wrapper));
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// For XOWs, we generally want to deny enumerate-like operations, but fail
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// silently (see CrossOriginAccessiblePropertiesOnly::deny).
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if (act == Wrapper::ENUMERATE)
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return false;
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const char *name;
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const js::Class *clasp = js::GetObjectClass(obj);
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MOZ_ASSERT(!XrayUtils::IsXPCWNHolderClass(Jsvalify(clasp)), "shouldn't have a holder here");
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if (clasp->ext.innerObject)
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name = "Window";
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else
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name = clasp->name;
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if (JSID_IS_STRING(id)) {
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if (IsPermitted(name, JSID_TO_FLAT_STRING(id), act == Wrapper::SET))
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return true;
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}
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if (act != Wrapper::GET)
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return false;
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// Check for frame IDs. If we're resolving named frames, make sure to only
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// resolve ones that don't shadow native properties. See bug 860494.
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if (IsWindow(name)) {
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if (JSID_IS_STRING(id) && !XrayUtils::IsXrayResolving(cx, wrapper, id)) {
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bool wouldShadow = false;
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if (!XrayUtils::HasNativeProperty(cx, wrapper, id, &wouldShadow) ||
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wouldShadow)
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{
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return false;
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}
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}
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return IsFrameId(cx, obj, id);
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}
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return false;
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}
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enum Access { READ = (1<<0), WRITE = (1<<1), NO_ACCESS = 0 };
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static void
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EnterAndThrow(JSContext *cx, JSObject *wrapper, const char *msg)
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{
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JSAutoCompartment ac(cx, wrapper);
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JS_ReportError(cx, msg);
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}
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bool
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ExposedPropertiesOnly::check(JSContext *cx, JSObject *wrapperArg, jsid idArg, Wrapper::Action act)
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{
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RootedObject wrapper(cx, wrapperArg);
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RootedId id(cx, idArg);
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RootedObject wrappedObject(cx, Wrapper::wrappedObject(wrapper));
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if (act == Wrapper::CALL)
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return true;
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RootedId exposedPropsId(cx, GetRTIdByIndex(cx, XPCJSRuntime::IDX_EXPOSEDPROPS));
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// We need to enter the wrappee's compartment to look at __exposedProps__,
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// but we want to be in the wrapper's compartment if we call Deny().
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//
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// Unfortunately, |cx| can be in either compartment when we call ::check. :-(
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JSAutoCompartment ac(cx, wrappedObject);
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bool found = false;
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if (!JS_HasPropertyById(cx, wrappedObject, exposedPropsId, &found))
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return false;
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// Always permit access to "length" and indexed properties of arrays.
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if ((JS_IsArrayObject(cx, wrappedObject) ||
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JS_IsTypedArrayObject(wrappedObject)) &&
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((JSID_IS_INT(id) && JSID_TO_INT(id) >= 0) ||
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(JSID_IS_STRING(id) && JS_FlatStringEqualsAscii(JSID_TO_FLAT_STRING(id), "length")))) {
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return true; // Allow
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}
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// If no __exposedProps__ existed, deny access.
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if (!found) {
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return false;
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}
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if (id == JSID_VOID)
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return true;
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RootedValue exposedProps(cx);
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if (!JS_LookupPropertyById(cx, wrappedObject, exposedPropsId, &exposedProps))
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return false;
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if (exposedProps.isNullOrUndefined())
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return false;
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if (!exposedProps.isObject()) {
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EnterAndThrow(cx, wrapper, "__exposedProps__ must be undefined, null, or an Object");
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return false;
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}
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RootedObject hallpass(cx, &exposedProps.toObject());
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if (!AccessCheck::subsumes(js::UncheckedUnwrap(hallpass), wrappedObject)) {
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EnterAndThrow(cx, wrapper, "Invalid __exposedProps__");
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return false;
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}
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Access access = NO_ACCESS;
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Rooted<JSPropertyDescriptor> desc(cx);
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if (!JS_GetPropertyDescriptorById(cx, hallpass, id, 0, &desc)) {
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return false; // Error
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}
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if (!desc.object() || !desc.isEnumerable())
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return false;
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if (!desc.value().isString()) {
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EnterAndThrow(cx, wrapper, "property must be a string");
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return false;
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}
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JSString *str = desc.value().toString();
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size_t length;
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const jschar *chars = JS_GetStringCharsAndLength(cx, str, &length);
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if (!chars)
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return false;
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for (size_t i = 0; i < length; ++i) {
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switch (chars[i]) {
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case 'r':
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if (access & READ) {
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EnterAndThrow(cx, wrapper, "duplicate 'readable' property flag");
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return false;
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}
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access = Access(access | READ);
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break;
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case 'w':
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if (access & WRITE) {
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EnterAndThrow(cx, wrapper, "duplicate 'writable' property flag");
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return false;
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}
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access = Access(access | WRITE);
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break;
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default:
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EnterAndThrow(cx, wrapper, "properties can only be readable or read and writable");
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return false;
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}
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}
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if (access == NO_ACCESS) {
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EnterAndThrow(cx, wrapper, "specified properties must have a permission bit set");
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return false;
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}
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if ((act == Wrapper::SET && !(access & WRITE)) ||
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(act != Wrapper::SET && !(access & READ))) {
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return false;
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}
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return true;
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}
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bool
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ExposedPropertiesOnly::allowNativeCall(JSContext *cx, JS::IsAcceptableThis test,
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JS::NativeImpl impl)
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{
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return js::IsTypedArrayThisCheck(test);
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}
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}
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