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gecko-dev/browser/app/winlauncher/LauncherProcessWin.cpp

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C++
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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 https://mozilla.org/MPL/2.0/. */
#include "LauncherProcessWin.h"
#include <string.h>
#include "mozilla/Attributes.h"
#include "mozilla/CmdLineAndEnvUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/DynamicallyLinkedFunctionPtr.h"
#include "mozilla/glue/Debug.h"
#include "mozilla/Maybe.h"
#include "mozilla/SafeMode.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/WindowsConsole.h"
#include "mozilla/WindowsVersion.h"
#include "mozilla/WinHeaderOnlyUtils.h"
#include "nsWindowsHelpers.h"
#include <windows.h>
#include <processthreadsapi.h>
#include "DllBlocklistInit.h"
#include "ErrorHandler.h"
#include "LaunchUnelevated.h"
#include "ProcThreadAttributes.h"
#if defined(MOZ_LAUNCHER_PROCESS)
# include "mozilla/LauncherRegistryInfo.h"
# include "SameBinary.h"
#endif // defined(MOZ_LAUNCHER_PROCESS)
/**
* At this point the child process has been created in a suspended state. Any
* additional startup work (eg, blocklist setup) should go here.
*
* @return Ok if browser startup should proceed
*/
static mozilla::LauncherVoidResult PostCreationSetup(
const wchar_t* aFullImagePath, HANDLE aChildProcess,
HANDLE aChildMainThread, const bool aIsSafeMode) {
// The launcher process's DLL blocking code is incompatible with ASAN because
// it is able to execute before ASAN itself has even initialized.
// Also, the AArch64 build doesn't yet have a working interceptor.
#if defined(MOZ_ASAN) || defined(_M_ARM64)
return mozilla::Ok();
#else
return mozilla::InitializeDllBlocklistOOP(aFullImagePath, aChildProcess);
#endif // defined(MOZ_ASAN) || defined(_M_ARM64)
}
#if !defined( \
PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_PREFER_SYSTEM32_ALWAYS_ON)
# define PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_PREFER_SYSTEM32_ALWAYS_ON \
(0x00000001ULL << 60)
#endif // !defined(PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_PREFER_SYSTEM32_ALWAYS_ON)
#if !defined(PROCESS_CREATION_MITIGATION_POLICY_CONTROL_FLOW_GUARD_ALWAYS_OFF)
# define PROCESS_CREATION_MITIGATION_POLICY_CONTROL_FLOW_GUARD_ALWAYS_OFF \
(0x00000002ULL << 40)
#endif // !defined(PROCESS_CREATION_MITIGATION_POLICY_CONTROL_FLOW_GUARD_ALWAYS_OFF)
#if (_WIN32_WINNT < 0x0602)
BOOL WINAPI
SetProcessMitigationPolicy(PROCESS_MITIGATION_POLICY aMitigationPolicy,
PVOID aBuffer, SIZE_T aBufferLen);
#endif // (_WIN32_WINNT >= 0x0602)
/**
* Any mitigation policies that should be set on the browser process should go
* here.
*/
static void SetMitigationPolicies(mozilla::ProcThreadAttributes& aAttrs,
const bool aIsSafeMode) {
if (mozilla::IsWin10AnniversaryUpdateOrLater()) {
aAttrs.AddMitigationPolicy(
PROCESS_CREATION_MITIGATION_POLICY_IMAGE_LOAD_PREFER_SYSTEM32_ALWAYS_ON);
}
#if defined(_M_ARM64)
// Disable CFG on older versions of ARM64 Windows to avoid a crash in COM.
if (!mozilla::IsWin10Sep2018UpdateOrLater()) {
aAttrs.AddMitigationPolicy(
PROCESS_CREATION_MITIGATION_POLICY_CONTROL_FLOW_GUARD_ALWAYS_OFF);
}
#endif // defined(_M_ARM64)
}
static mozilla::LauncherFlags ProcessCmdLine(int& aArgc, wchar_t* aArgv[]) {
mozilla::LauncherFlags result = mozilla::LauncherFlags::eNone;
if (mozilla::CheckArg(aArgc, aArgv, L"wait-for-browser",
static_cast<const wchar_t**>(nullptr),
mozilla::CheckArgFlag::RemoveArg) ==
mozilla::ARG_FOUND ||
mozilla::CheckArg(aArgc, aArgv, L"marionette",
static_cast<const wchar_t**>(nullptr),
mozilla::CheckArgFlag::None) == mozilla::ARG_FOUND ||
mozilla::CheckArg(aArgc, aArgv, L"headless",
static_cast<const wchar_t**>(nullptr),
mozilla::CheckArgFlag::None) == mozilla::ARG_FOUND ||
mozilla::EnvHasValue("MOZ_AUTOMATION") ||
mozilla::EnvHasValue("MOZ_HEADLESS")) {
result |= mozilla::LauncherFlags::eWaitForBrowser;
}
if (mozilla::CheckArg(aArgc, aArgv, L"no-deelevate") == mozilla::ARG_FOUND) {
result |= mozilla::LauncherFlags::eNoDeelevate;
}
return result;
}
static void MaybeBreakForBrowserDebugging() {
if (mozilla::EnvHasValue("MOZ_DEBUG_BROWSER_PROCESS")) {
::DebugBreak();
return;
}
const wchar_t* pauseLenS = _wgetenv(L"MOZ_DEBUG_BROWSER_PAUSE");
if (!pauseLenS || !(*pauseLenS)) {
return;
}
DWORD pauseLenMs = wcstoul(pauseLenS, nullptr, 10) * 1000;
printf_stderr("\n\nBROWSERBROWSERBROWSERBROWSER\n debug me @ %lu\n\n",
::GetCurrentProcessId());
::Sleep(pauseLenMs);
}
static bool DoLauncherProcessChecks(int& argc, wchar_t** argv) {
// NB: We run all tests in this function instead of returning early in order
// to ensure that all side effects take place, such as clearing environment
// variables.
bool result = false;
#if defined(MOZ_LAUNCHER_PROCESS)
// We still prefer to compare file ids. Comparing NT paths i.e. passing
// CompareNtPathsOnly to IsSameBinaryAsParentProcess is much faster, but
// we're not 100% sure that NT path comparison perfectly prevents the
// launching loop of the launcher process.
mozilla::LauncherResult<bool> isSame = mozilla::IsSameBinaryAsParentProcess();
if (isSame.isOk()) {
result = !isSame.unwrap();
} else {
HandleLauncherError(isSame.unwrapErr());
}
#endif // defined(MOZ_LAUNCHER_PROCESS)
if (mozilla::EnvHasValue("MOZ_LAUNCHER_PROCESS")) {
mozilla::SaveToEnv("MOZ_LAUNCHER_PROCESS=");
result = true;
}
result |= mozilla::CheckArg(
argc, argv, L"launcher", static_cast<const wchar_t**>(nullptr),
mozilla::CheckArgFlag::RemoveArg) == mozilla::ARG_FOUND;
return result;
}
#if defined(MOZ_LAUNCHER_PROCESS)
static mozilla::Maybe<bool> RunAsLauncherProcess(
mozilla::LauncherRegistryInfo& aRegInfo, int& argc, wchar_t** argv) {
#else
static mozilla::Maybe<bool> RunAsLauncherProcess(int& argc, wchar_t** argv) {
#endif // defined(MOZ_LAUNCHER_PROCESS)
// return fast when we're a child process.
// (The remainder of this function has some side effects that are
// undesirable for content processes)
if (mozilla::CheckArg(argc, argv, L"contentproc",
static_cast<const wchar_t**>(nullptr),
mozilla::CheckArgFlag::None) == mozilla::ARG_FOUND) {
return mozilla::Some(false);
}
bool runAsLauncher = DoLauncherProcessChecks(argc, argv);
#if defined(MOZ_LAUNCHER_PROCESS)
bool forceLauncher =
runAsLauncher &&
mozilla::CheckArg(argc, argv, L"force-launcher",
static_cast<const wchar_t**>(nullptr),
mozilla::CheckArgFlag::RemoveArg) == mozilla::ARG_FOUND;
mozilla::LauncherRegistryInfo::ProcessType desiredType =
runAsLauncher ? mozilla::LauncherRegistryInfo::ProcessType::Launcher
: mozilla::LauncherRegistryInfo::ProcessType::Browser;
mozilla::LauncherRegistryInfo::CheckOption checkOption =
forceLauncher ? mozilla::LauncherRegistryInfo::CheckOption::Force
: mozilla::LauncherRegistryInfo::CheckOption::Default;
mozilla::LauncherResult<mozilla::LauncherRegistryInfo::ProcessType>
runAsType = aRegInfo.Check(desiredType, checkOption);
if (runAsType.isErr()) {
mozilla::HandleLauncherError(runAsType);
return mozilla::Nothing();
}
runAsLauncher = runAsType.unwrap() ==
mozilla::LauncherRegistryInfo::ProcessType::Launcher;
#endif // defined(MOZ_LAUNCHER_PROCESS)
if (!runAsLauncher) {
// In this case, we will be proceeding to run as the browser.
// We should check MOZ_DEBUG_BROWSER_* env vars.
MaybeBreakForBrowserDebugging();
}
return mozilla::Some(runAsLauncher);
}
namespace mozilla {
Maybe<int> LauncherMain(int& argc, wchar_t* argv[],
const StaticXREAppData& aAppData) {
// Note: keep in sync with nsBrowserApp.
const wchar_t* acceptableParams[] = {L"url", nullptr};
EnsureCommandlineSafe(argc, argv, acceptableParams);
SetLauncherErrorAppData(aAppData);
if (CheckArg(argc, argv, L"log-launcher-error",
static_cast<const wchar_t**>(nullptr),
mozilla::CheckArgFlag::RemoveArg) == ARG_FOUND) {
SetLauncherErrorForceEventLog();
}
#if defined(MOZ_LAUNCHER_PROCESS)
LauncherRegistryInfo regInfo;
Maybe<bool> runAsLauncher = RunAsLauncherProcess(regInfo, argc, argv);
#else
Maybe<bool> runAsLauncher = RunAsLauncherProcess(argc, argv);
#endif // defined(MOZ_LAUNCHER_PROCESS)
if (!runAsLauncher || !runAsLauncher.value()) {
#if defined(MOZ_LAUNCHER_PROCESS)
// Update the registry as Browser
LauncherVoidResult commitResult = regInfo.Commit();
if (commitResult.isErr()) {
mozilla::HandleLauncherError(commitResult);
}
#endif // defined(MOZ_LAUNCHER_PROCESS)
return Nothing();
}
// Make sure that the launcher process itself has image load policies set
if (IsWin10AnniversaryUpdateOrLater()) {
static const StaticDynamicallyLinkedFunctionPtr<decltype(
&SetProcessMitigationPolicy)>
pSetProcessMitigationPolicy(L"kernel32.dll",
"SetProcessMitigationPolicy");
if (pSetProcessMitigationPolicy) {
PROCESS_MITIGATION_IMAGE_LOAD_POLICY imgLoadPol = {};
imgLoadPol.PreferSystem32Images = 1;
DebugOnly<BOOL> setOk = pSetProcessMitigationPolicy(
ProcessImageLoadPolicy, &imgLoadPol, sizeof(imgLoadPol));
MOZ_ASSERT(setOk);
}
}
mozilla::UseParentConsole();
if (!SetArgv0ToFullBinaryPath(argv)) {
HandleLauncherError(LAUNCHER_ERROR_GENERIC());
return Nothing();
}
LauncherFlags flags = ProcessCmdLine(argc, argv);
nsAutoHandle mediumIlToken;
LauncherResult<ElevationState> elevationState =
GetElevationState(flags, mediumIlToken);
if (elevationState.isErr()) {
HandleLauncherError(elevationState);
return Nothing();
}
// If we're elevated, we should relaunch ourselves as a normal user.
// Note that we only call LaunchUnelevated when we don't need to wait for the
// browser process.
if (elevationState.unwrap() == ElevationState::eElevated &&
!(flags &
(LauncherFlags::eWaitForBrowser | LauncherFlags::eNoDeelevate)) &&
!mediumIlToken.get()) {
LauncherVoidResult launchedUnelevated = LaunchUnelevated(argc, argv);
bool failed = launchedUnelevated.isErr();
if (failed) {
HandleLauncherError(launchedUnelevated);
return Nothing();
}
return Some(0);
}
#if defined(MOZ_LAUNCHER_PROCESS)
// Update the registry as Launcher
LauncherVoidResult commitResult = regInfo.Commit();
if (commitResult.isErr()) {
mozilla::HandleLauncherError(commitResult);
return Nothing();
}
#endif // defined(MOZ_LAUNCHER_PROCESS)
// Now proceed with setting up the parameters for process creation
UniquePtr<wchar_t[]> cmdLine(MakeCommandLine(argc, argv));
if (!cmdLine) {
HandleLauncherError(LAUNCHER_ERROR_GENERIC());
return Nothing();
}
const Maybe<bool> isSafeMode =
IsSafeModeRequested(argc, argv, SafeModeFlag::NoKeyPressCheck);
if (!isSafeMode) {
HandleLauncherError(LAUNCHER_ERROR_FROM_WIN32(ERROR_INVALID_PARAMETER));
return Nothing();
}
ProcThreadAttributes attrs;
SetMitigationPolicies(attrs, isSafeMode.value());
HANDLE stdHandles[] = {::GetStdHandle(STD_INPUT_HANDLE),
::GetStdHandle(STD_OUTPUT_HANDLE),
::GetStdHandle(STD_ERROR_HANDLE)};
attrs.AddInheritableHandles(stdHandles);
DWORD creationFlags = CREATE_SUSPENDED | CREATE_UNICODE_ENVIRONMENT;
STARTUPINFOEXW siex;
LauncherResult<bool> attrsOk = attrs.AssignTo(siex);
if (attrsOk.isErr()) {
HandleLauncherError(attrsOk);
return Nothing();
}
BOOL inheritHandles = FALSE;
if (attrsOk.unwrap()) {
creationFlags |= EXTENDED_STARTUPINFO_PRESENT;
if (attrs.HasInheritableHandles()) {
siex.StartupInfo.dwFlags |= STARTF_USESTDHANDLES;
siex.StartupInfo.hStdInput = stdHandles[0];
siex.StartupInfo.hStdOutput = stdHandles[1];
siex.StartupInfo.hStdError = stdHandles[2];
// Since attrsOk == true, we have successfully set the handle inheritance
// whitelist policy, so only the handles added to attrs will be inherited.
inheritHandles = TRUE;
}
}
PROCESS_INFORMATION pi = {};
BOOL createOk;
if (mediumIlToken.get()) {
createOk =
::CreateProcessAsUserW(mediumIlToken.get(), argv[0], cmdLine.get(),
nullptr, nullptr, inheritHandles, creationFlags,
nullptr, nullptr, &siex.StartupInfo, &pi);
} else {
createOk = ::CreateProcessW(argv[0], cmdLine.get(), nullptr, nullptr,
inheritHandles, creationFlags, nullptr, nullptr,
&siex.StartupInfo, &pi);
}
if (!createOk) {
HandleLauncherError(LAUNCHER_ERROR_FROM_LAST());
return Nothing();
}
nsAutoHandle process(pi.hProcess);
nsAutoHandle mainThread(pi.hThread);
LauncherVoidResult setupResult = PostCreationSetup(
argv[0], process.get(), mainThread.get(), isSafeMode.value());
if (setupResult.isErr()) {
HandleLauncherError(setupResult);
::TerminateProcess(process.get(), 1);
return Nothing();
}
if (::ResumeThread(mainThread.get()) == static_cast<DWORD>(-1)) {
HandleLauncherError(LAUNCHER_ERROR_FROM_LAST());
::TerminateProcess(process.get(), 1);
return Nothing();
}
if (flags & LauncherFlags::eWaitForBrowser) {
DWORD exitCode;
if (::WaitForSingleObject(process.get(), INFINITE) == WAIT_OBJECT_0 &&
::GetExitCodeProcess(process.get(), &exitCode)) {
// Propagate the browser process's exit code as our exit code.
return Some(static_cast<int>(exitCode));
}
} else {
const DWORD timeout =
::IsDebuggerPresent() ? INFINITE : kWaitForInputIdleTimeoutMS;
// Keep the current process around until the callback process has created
// its message queue, to avoid the launched process's windows being forced
// into the background.
mozilla::WaitForInputIdle(process.get(), timeout);
}
return Some(0);
}
} // namespace mozilla
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