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// Copyright (c) 2010 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 "build/build_config.h"
#if defined(OS_WIN)
#include <objbase.h>
#include <windows.h>
#endif
#include "base/command_line.h"
#include "base/message_loop.h"
#include "base/string_util.h"
#include "base/threading/platform_thread.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/default_plugin.h"
#include "chrome/common/hi_res_timer_manager.h"
#include "chrome/common/logging_chrome.h"
#include "chrome/common/main_function_params.h"
#include "chrome/plugin/plugin_thread.h"
#include "content/common/child_process.h"
#include "ui/base/system_monitor/system_monitor.h"
#if defined(OS_WIN)
#include "chrome/test/injection_test_dll.h"
#include "sandbox/src/sandbox.h"
#elif defined(OS_POSIX) && !defined(OS_MACOSX)
#include "base/global_descriptors_posix.h"
#include "ipc/ipc_descriptors.h"
#endif
#if defined(USE_LINUX_BREAKPAD)
#include "chrome/app/breakpad_linux.h"
#endif
#if defined(OS_MACOSX)
// Removes our Carbon library interposing from the environment so that it
// doesn't carry into any processes that plugins might start.
void TrimInterposeEnvironment();
// Initializes the global Cocoa application object.
void InitializeChromeApplication();
#elif defined(OS_LINUX)
// Work around an unimplemented instruction in 64-bit Flash.
void WorkaroundFlashLAHF();
#endif
#if defined(OS_WIN)
// This function is provided so that the built-in flash can lock down the
// sandbox by calling DelayedLowerToken(0).
extern "C" DWORD __declspec(dllexport) __stdcall DelayedLowerToken(void* ts) {
// s_ts is only set the first time the function is called, which happens
// in PluginMain.
static sandbox::TargetServices* s_ts =
reinterpret_cast<sandbox::TargetServices*>(ts);
if (ts)
return 0;
s_ts->LowerToken();
return 1;
};
// Returns true if the plugin to be loaded is the internal flash.
bool IsPluginBuiltInFlash(const CommandLine& cmd_line) {
FilePath path = cmd_line.GetSwitchValuePath(switches::kPluginPath);
return (path.BaseName() == FilePath(L"gcswf32.dll"));
}
// Before we lock down the flash sandbox, we need to activate
// the IME machinery. After lock down it seems it is unable
// to start. Note that we leak the IME context on purpose.
int PreloadIMEForFlash() {
HIMC imc = ::ImmCreateContext();
if (!imc)
return 0;
if (::ImmGetOpenStatus(imc))
return 1;
return 2;
}
#endif
// main() routine for running as the plugin process.
int PluginMain(const MainFunctionParams& parameters) {
#if defined(USE_LINUX_BREAKPAD)
// Needs to be called after we have chrome::DIR_USER_DATA.
InitCrashReporter();
#endif
// The main thread of the plugin services UI.
#if defined(OS_MACOSX)
#if !defined(__LP64__)
TrimInterposeEnvironment();
#endif
InitializeChromeApplication();
#endif
MessageLoop main_message_loop(MessageLoop::TYPE_UI);
base::PlatformThread::SetName("CrPluginMain");
ui::SystemMonitor system_monitor;
HighResolutionTimerManager high_resolution_timer_manager;
const CommandLine& parsed_command_line = parameters.command_line_;
#if defined(OS_LINUX)
#if defined(ARCH_CPU_64_BITS)
WorkaroundFlashLAHF();
#endif
#elif defined(OS_WIN)
sandbox::TargetServices* target_services =
parameters.sandbox_info_.TargetServices();
CoInitialize(NULL);
DVLOG(1) << "Started plugin with "
<< parsed_command_line.command_line_string();
HMODULE sandbox_test_module = NULL;
bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox);
if (target_services && !no_sandbox) {
// The command line might specify a test plugin to load.
if (parsed_command_line.HasSwitch(switches::kTestSandbox)) {
std::wstring test_plugin_name =
parsed_command_line.GetSwitchValueNative(switches::kTestSandbox);
sandbox_test_module = LoadLibrary(test_plugin_name.c_str());
DCHECK(sandbox_test_module);
}
}
#endif
if (parsed_command_line.HasSwitch(switches::kPluginStartupDialog)) {
ChildProcess::WaitForDebugger(L"Plugin");
}
{
ChildProcess plugin_process;
plugin_process.set_main_thread(new PluginThread());
#if defined(OS_WIN)
if (!no_sandbox && target_services) {
// We are sandboxing the plugin. If it is a generic plug-in, we lock down
// the sandbox right away, but if it is the built-in flash we let flash
// start elevated and it will call DelayedLowerToken(0) when it's ready.
if (IsPluginBuiltInFlash(parsed_command_line)) {
DVLOG(1) << "Sandboxing flash";
if (!PreloadIMEForFlash())
DVLOG(1) << "IME preload failed";
DelayedLowerToken(target_services);
} else {
target_services->LowerToken();
}
}
if (sandbox_test_module) {
RunRendererTests run_security_tests =
reinterpret_cast<RunPluginTests>(GetProcAddress(sandbox_test_module,
kPluginTestCall));
DCHECK(run_security_tests);
if (run_security_tests) {
int test_count = 0;
DVLOG(1) << "Running plugin security tests";
BOOL result = run_security_tests(&test_count);
DCHECK(result) << "Test number " << test_count << " has failed.";
// If we are in release mode, crash or debug the process.
if (!result) {
__debugbreak();
_exit(1);
}
}
FreeLibrary(sandbox_test_module);
}
#endif
chrome::RegisterInternalDefaultPlugin();
MessageLoop::current()->Run();
}
#if defined(OS_WIN)
CoUninitialize();
#endif
return 0;
}
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