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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/renderer/renderer_main_platform_delegate.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "content/common/injection_test_dll.h"
#include "content/public/common/content_switches.h"
#include "content/public/renderer/render_thread.h"
#include "sandbox/src/sandbox.h"
#include "skia/ext/skia_sandbox_support_win.h"
#include "unicode/timezone.h"
namespace {
// In order to have Theme support, we need to connect to the theme service.
// This needs to be done before we lock down the renderer. Officially this
// can be done with OpenThemeData() but it fails unless you pass a valid
// window at least the first time. Interestingly, the very act of creating a
// window also sets the connection to the theme service.
void EnableThemeSupportForRenderer(bool no_sandbox) {
HWINSTA current = NULL;
HWINSTA winsta0 = NULL;
if (!no_sandbox) {
current = ::GetProcessWindowStation();
winsta0 = ::OpenWindowStationW(L"WinSta0", FALSE, GENERIC_READ);
if (!winsta0 || !::SetProcessWindowStation(winsta0)) {
// Could not set the alternate window station. There is a possibility
// that the theme wont be correctly initialized on XP.
NOTREACHED() << "Unable to switch to WinSt0";
}
}
HWND window = ::CreateWindowExW(0, L"Static", L"", WS_POPUP | WS_DISABLED,
CW_USEDEFAULT, 0, 0, 0, HWND_MESSAGE, NULL,
::GetModuleHandleA(NULL), NULL);
if (!window) {
DLOG(WARNING) << "failed to enable theme support";
} else {
::DestroyWindow(window);
}
if (!no_sandbox) {
// Revert the window station.
if (!current || !::SetProcessWindowStation(current)) {
// We failed to switch back to the secure window station. This might
// confuse the renderer enough that we should kill it now.
LOG(FATAL) << "Failed to restore alternate window station";
}
if (!::CloseWindowStation(winsta0)) {
// We might be leaking a winsta0 handle. This is a security risk, but
// since we allow fail over to no desktop protection in low memory
// condition, this is not a big risk.
NOTREACHED();
}
}
}
// Windows-only skia sandbox support
void SkiaPreCacheFont(LOGFONT logfont) {
content::RenderThread* render_thread = content::RenderThread::Get();
if (render_thread) {
render_thread->PreCacheFont(logfont);
}
}
} // namespace
RendererMainPlatformDelegate::RendererMainPlatformDelegate(
const content::MainFunctionParams& parameters)
: parameters_(parameters),
sandbox_test_module_(NULL) {
}
RendererMainPlatformDelegate::~RendererMainPlatformDelegate() {
}
void RendererMainPlatformDelegate::PlatformInitialize() {
// Be mindful of what resources you acquire here. They can be used by
// malicious code if the renderer gets compromised.
const CommandLine& command_line = parameters_.command_line;
bool no_sandbox = command_line.HasSwitch(switches::kNoSandbox);
EnableThemeSupportForRenderer(no_sandbox);
if (!no_sandbox) {
// ICU DateFormat class (used in base/time_format.cc) needs to get the
// Olson timezone ID by accessing the registry keys under
// HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones.
// After TimeZone::createDefault is called once here, the timezone ID is
// cached and there's no more need to access the registry. If the sandbox
// is disabled, we don't have to make this dummy call.
scoped_ptr<icu::TimeZone> zone(icu::TimeZone::createDefault());
SetSkiaEnsureTypefaceAccessible(SkiaPreCacheFont);
}
}
void RendererMainPlatformDelegate::PlatformUninitialize() {
}
bool RendererMainPlatformDelegate::InitSandboxTests(bool no_sandbox) {
const CommandLine& command_line = parameters_.command_line;
DVLOG(1) << "Started renderer with " << command_line.GetCommandLineString();
sandbox::TargetServices* target_services =
parameters_.sandbox_info->target_services;
if (target_services && !no_sandbox) {
std::wstring test_dll_name =
command_line.GetSwitchValueNative(switches::kTestSandbox);
if (!test_dll_name.empty()) {
sandbox_test_module_ = LoadLibrary(test_dll_name.c_str());
DCHECK(sandbox_test_module_);
if (!sandbox_test_module_) {
return false;
}
}
}
return true;
}
bool RendererMainPlatformDelegate::EnableSandbox() {
sandbox::TargetServices* target_services =
parameters_.sandbox_info->target_services;
if (target_services) {
// Cause advapi32 to load before the sandbox is turned on.
unsigned int dummy_rand;
rand_s(&dummy_rand);
// Warm up language subsystems before the sandbox is turned on.
::GetUserDefaultLangID();
::GetUserDefaultLCID();
target_services->LowerToken();
return true;
}
return false;
}
void RendererMainPlatformDelegate::RunSandboxTests() {
if (sandbox_test_module_) {
RunRendererTests run_security_tests =
reinterpret_cast<RunRendererTests>(GetProcAddress(sandbox_test_module_,
kRenderTestCall));
DCHECK(run_security_tests);
if (run_security_tests) {
int test_count = 0;
DVLOG(1) << "Running renderer security tests";
BOOL result = run_security_tests(&test_count);
CHECK(result) << "Test number " << test_count << " has failed.";
}
}
}
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