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/* -*- 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 "mozilla/dom/FileSystemRequestParent.h"
#include "mozilla/dom/PFileSystemParams.h"
#include "GetDirectoryListingTask.h"
#include "GetFileOrDirectoryTask.h"
#include "GetFilesTask.h"
#include "OSFileSystem.h"
#include "mozilla/AppProcessChecker.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/FileSystemBase.h"
#include "mozilla/dom/FileSystemSecurity.h"
#include "mozilla/ipc/BackgroundParent.h"
#include "mozilla/Preferences.h"
#include "mozilla/Unused.h"
#include "nsProxyRelease.h"
using namespace mozilla::ipc;
namespace mozilla {
namespace dom {
FileSystemRequestParent::FileSystemRequestParent()
: mDestroyed(false)
{
AssertIsOnBackgroundThread();
}
FileSystemRequestParent::~FileSystemRequestParent()
{
AssertIsOnBackgroundThread();
}
#define FILESYSTEM_REQUEST_PARENT_DISPATCH_ENTRY(name) \
case FileSystemParams::TFileSystem##name##Params: { \
const FileSystem##name##Params& p = aParams; \
mFileSystem = new OSFileSystemParent(p.filesystem()); \
MOZ_ASSERT(mFileSystem); \
mTask = name##TaskParent::Create(mFileSystem, p, this, rv); \
if (NS_WARN_IF(rv.Failed())) { \
rv.SuppressException(); \
return false; \
} \
break; \
}
bool
FileSystemRequestParent::Initialize(const FileSystemParams& aParams)
{
AssertIsOnBackgroundThread();
ErrorResult rv;
switch (aParams.type()) {
FILESYSTEM_REQUEST_PARENT_DISPATCH_ENTRY(GetDirectoryListing)
FILESYSTEM_REQUEST_PARENT_DISPATCH_ENTRY(GetFileOrDirectory)
FILESYSTEM_REQUEST_PARENT_DISPATCH_ENTRY(GetFiles)
default: {
NS_RUNTIMEABORT("not reached");
break;
}
}
if (NS_WARN_IF(!mTask || !mFileSystem)) {
// Should never reach here.
return false;
}
return true;
}
namespace {
class CheckPermissionRunnable final : public Runnable
{
public:
CheckPermissionRunnable(already_AddRefed<ContentParent> aParent,
FileSystemRequestParent* aActor,
FileSystemTaskParentBase* aTask,
const nsAString& aPath)
: mContentParent(aParent)
, mActor(aActor)
, mTask(aTask)
, mPath(aPath)
, mBackgroundEventTarget(NS_GetCurrentThread())
{
AssertIsInMainProcess();
AssertIsOnBackgroundThread();
MOZ_ASSERT(mContentParent);
MOZ_ASSERT(mActor);
MOZ_ASSERT(mTask);
MOZ_ASSERT(mBackgroundEventTarget);
}
NS_IMETHOD
Run() override
{
if (NS_IsMainThread()) {
auto raii = mozilla::MakeScopeExit([&] { mContentParent = nullptr; });
if (!mozilla::Preferences::GetBool("dom.filesystem.pathcheck.disabled", false)) {
RefPtr<FileSystemSecurity> fss = FileSystemSecurity::Get();
if (NS_WARN_IF(!fss ||
!fss->ContentProcessHasAccessTo(mContentParent->ChildID(),
mPath))) {
mContentParent->KillHard("This path is not allowed.");
return NS_OK;
}
}
return mBackgroundEventTarget->Dispatch(this, NS_DISPATCH_NORMAL);
}
AssertIsOnBackgroundThread();
// It can happen that this actor has been destroyed in the meantime we were
// on the main-thread.
if (!mActor->Destroyed()) {
mTask->Start();
}
return NS_OK;
}
private:
~CheckPermissionRunnable()
{
NS_ProxyRelease(mBackgroundEventTarget, mActor.forget());
}
RefPtr<ContentParent> mContentParent;
RefPtr<FileSystemRequestParent> mActor;
RefPtr<FileSystemTaskParentBase> mTask;
const nsString mPath;
nsCOMPtr<nsIEventTarget> mBackgroundEventTarget;
};
} // anonymous
void
FileSystemRequestParent::Start()
{
AssertIsInMainProcess();
AssertIsOnBackgroundThread();
MOZ_ASSERT(!mDestroyed);
MOZ_ASSERT(mFileSystem);
MOZ_ASSERT(mTask);
nsAutoString path;
if (NS_WARN_IF(NS_FAILED(mTask->GetTargetPath(path)))) {
Unused << Send__delete__(this, FileSystemErrorResponse(NS_ERROR_DOM_SECURITY_ERR));
return;
}
RefPtr<ContentParent> parent = BackgroundParent::GetContentParent(Manager());
// If the ContentParent is null we are dealing with a same-process actor.
if (!parent) {
mTask->Start();
return;
}
RefPtr<Runnable> runnable =
new CheckPermissionRunnable(parent.forget(), this, mTask, path);
NS_DispatchToMainThread(runnable);
}
void
FileSystemRequestParent::ActorDestroy(ActorDestroyReason aWhy)
{
AssertIsOnBackgroundThread();
MOZ_ASSERT(!mDestroyed);
if (!mFileSystem) {
return;
}
mFileSystem->Shutdown();
mFileSystem = nullptr;
mTask = nullptr;
mDestroyed = true;
}
} // namespace dom
} // namespace mozilla
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