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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/ipc/IOThreadChild.h"
#include "ContentProcess.h"
#include "base/shared_memory.h"
#include "mozilla/Preferences.h"
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
# include <stdlib.h>
# include "mozilla/Sandbox.h"
#endif
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
# include "mozilla/WindowsProcessMitigations.h"
#endif
#if (defined(XP_WIN) || defined(XP_MACOSX)) && defined(MOZ_SANDBOX)
# include "mozilla/SandboxSettings.h"
# include "nsAppDirectoryServiceDefs.h"
# include "nsDirectoryService.h"
# include "nsDirectoryServiceDefs.h"
#endif
#include "nsAppRunner.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/ipc/ProcessUtils.h"
#include "mozilla/GeckoArgs.h"
#include "nsAppStartupNotifier.h"
using mozilla::ipc::IOThreadChild;
namespace mozilla::dom {
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
static void SetTmpEnvironmentVariable(nsIFile* aValue) {
// Save the TMP environment variable so that is is picked up by GetTempPath().
// Note that we specifically write to the TMP variable, as that is the first
// variable that is checked by GetTempPath() to determine its output.
nsAutoString fullTmpPath;
nsresult rv = aValue->GetPath(fullTmpPath);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
Unused << NS_WARN_IF(!SetEnvironmentVariableW(L"TMP", fullTmpPath.get()));
// We also set TEMP in case there is naughty third-party code that is
// referencing the environment variable directly.
Unused << NS_WARN_IF(!SetEnvironmentVariableW(L"TEMP", fullTmpPath.get()));
}
#endif
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
static void SetUpSandboxEnvironment() {
MOZ_ASSERT(
nsDirectoryService::gService,
"SetUpSandboxEnvironment relies on nsDirectoryService being initialized");
// On Windows, a sandbox-writable temp directory is used whenever the sandbox
// is enabled, except when win32k is locked down when we no longer require a
// temp directory.
if (!IsContentSandboxEnabled() || IsWin32kLockedDown()) {
return;
}
nsCOMPtr<nsIFile> sandboxedContentTemp;
nsresult rv = nsDirectoryService::gService->Get(
NS_APP_CONTENT_PROCESS_TEMP_DIR, NS_GET_IID(nsIFile),
getter_AddRefs(sandboxedContentTemp));
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
// Change the gecko defined temp directory to our sandbox-writable one.
// Undefine returns a failure if the property is not already set.
Unused << nsDirectoryService::gService->Undefine(NS_OS_TEMP_DIR);
rv = nsDirectoryService::gService->Set(NS_OS_TEMP_DIR, sandboxedContentTemp);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
SetTmpEnvironmentVariable(sandboxedContentTemp);
}
#endif
static nsresult GetGREDir(nsIFile** aResult) {
nsCOMPtr<nsIFile> current;
nsresult rv = XRE_GetBinaryPath(getter_AddRefs(current));
NS_ENSURE_SUCCESS(rv, rv);
#ifdef OS_MACOSX
// Walk out of [subprocess].app/Contents/MacOS to the real GRE dir
const int depth = 4;
#else
const int depth = 1;
#endif
for (int i = 0; i < depth; ++i) {
nsCOMPtr<nsIFile> parent;
rv = current->GetParent(getter_AddRefs(parent));
NS_ENSURE_SUCCESS(rv, rv);
current = parent;
NS_ENSURE_TRUE(current, NS_ERROR_UNEXPECTED);
}
#ifdef OS_MACOSX
rv = current->SetNativeLeafName("Resources"_ns);
NS_ENSURE_SUCCESS(rv, rv);
#endif
current.forget(aResult);
return NS_OK;
}
ContentProcess::ContentProcess(ProcessId aParentPid,
const nsID& aMessageChannelId)
: ProcessChild(aParentPid, aMessageChannelId) {
NS_LogInit();
}
ContentProcess::~ContentProcess() { NS_LogTerm(); }
bool ContentProcess::Init(int aArgc, char* aArgv[]) {
Maybe<uint64_t> childID = geckoargs::sChildID.Get(aArgc, aArgv);
Maybe<bool> isForBrowser = Nothing();
Maybe<const char*> parentBuildID =
geckoargs::sParentBuildID.Get(aArgc, aArgv);
Maybe<uint64_t> jsInitHandle;
Maybe<uint64_t> jsInitLen = geckoargs::sJsInitLen.Get(aArgc, aArgv);
nsCOMPtr<nsIFile> appDirArg;
Maybe<const char*> appDir = geckoargs::sAppDir.Get(aArgc, aArgv);
if (appDir.isSome()) {
bool flag;
nsresult rv = XRE_GetFileFromPath(*appDir, getter_AddRefs(appDirArg));
if (NS_FAILED(rv) || NS_FAILED(appDirArg->Exists(&flag)) || !flag) {
NS_WARNING("Invalid application directory passed to content process.");
appDirArg = nullptr;
}
}
Maybe<bool> safeMode = geckoargs::sSafeMode.Get(aArgc, aArgv);
if (safeMode.isSome()) {
gSafeMode = *safeMode;
}
Maybe<bool> isForBrowerParam = geckoargs::sIsForBrowser.Get(aArgc, aArgv);
Maybe<bool> notForBrowserParam = geckoargs::sNotForBrowser.Get(aArgc, aArgv);
if (isForBrowerParam.isSome()) {
isForBrowser = Some(true);
}
if (notForBrowserParam.isSome()) {
isForBrowser = Some(false);
}
// command line: [-jsInitHandle handle] -jsInitLen length
#ifdef XP_WIN
jsInitHandle = geckoargs::sJsInitHandle.Get(aArgc, aArgv);
#endif
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
nsCOMPtr<nsIFile> profileDir;
bool flag;
Maybe<const char*> profile = geckoargs::sProfile.Get(aArgc, aArgv);
// xpcshell self-test on macOS will hit this, so check isSome() otherwise
// Maybe<> assertions will MOZ_CRASH() us.
if (profile.isSome()) {
nsresult rv = XRE_GetFileFromPath(*profile, getter_AddRefs(profileDir));
if (NS_FAILED(rv) || NS_FAILED(profileDir->Exists(&flag)) || !flag) {
NS_WARNING("Invalid profile directory passed to content process.");
profileDir = nullptr;
}
} else {
NS_WARNING("No profile directory passed to content process.");
}
#endif /* XP_MACOSX && MOZ_SANDBOX */
// Did we find all the mandatory flags?
if (childID.isNothing() || isForBrowser.isNothing() ||
parentBuildID.isNothing()) {
return false;
}
if (!ProcessChild::InitPrefs(aArgc, aArgv)) {
return false;
}
if (!::mozilla::ipc::ImportSharedJSInit(jsInitHandle.valueOr(0),
jsInitLen.valueOr(0))) {
return false;
}
mContent.Init(TakeInitialEndpoint(), *parentBuildID, *childID, *isForBrowser);
nsCOMPtr<nsIFile> greDir;
nsresult rv = GetGREDir(getter_AddRefs(greDir));
if (NS_FAILED(rv)) {
return false;
}
nsCOMPtr<nsIFile> xpcomAppDir = appDirArg ? appDirArg : greDir;
rv = mDirProvider.Initialize(xpcomAppDir, greDir, nullptr);
if (NS_FAILED(rv)) {
return false;
}
rv = NS_InitXPCOM(nullptr, xpcomAppDir, &mDirProvider);
if (NS_FAILED(rv)) {
return false;
}
nsAppStartupNotifier::NotifyObservers(APPSTARTUP_CATEGORY);
#if (defined(XP_MACOSX)) && defined(MOZ_SANDBOX)
mContent.SetProfileDir(profileDir);
# if defined(DEBUG)
if (IsContentSandboxEnabled()) {
AssertMacSandboxEnabled();
}
# endif /* DEBUG */
#endif /* XP_MACOSX && MOZ_SANDBOX */
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
SetUpSandboxEnvironment();
#endif
// Do this as early as possible to get the parent process to initialize the
// background thread since we'll likely need database information very soon.
mozilla::ipc::BackgroundChild::Startup();
mozilla::ipc::BackgroundChild::InitContentStarter(&mContent);
return true;
}
// Note: CleanUp() never gets called in non-debug builds because we exit early
// in ContentChild::ActorDestroy().
void ContentProcess::CleanUp() {
mDirProvider.DoShutdown();
NS_ShutdownXPCOM(nullptr);
}
} // namespace mozilla::dom
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