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//
// Copyright (C) 2014 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include <sysexits.h>
#include <base/at_exit.h>
#include <base/bind.h>
#include <base/command_line.h>
#include <base/threading/thread.h>
#include <brillo/minijail/minijail.h>
#include <brillo/syslog_logging.h>
#include <brillo/userdb_utils.h>
#include "trunks/background_command_transceiver.h"
#include "trunks/resource_manager.h"
#include "trunks/tpm_handle.h"
#include "trunks/tpm_simulator_handle.h"
#if defined(USE_BINDER_IPC)
#include "trunks/trunks_binder_service.h"
#else
#include "trunks/trunks_dbus_service.h"
#endif
#include "trunks/trunks_factory_impl.h"
#include "trunks/trunks_ftdi_spi.h"
namespace {
const uid_t kRootUID = 0;
const char kTrunksUser[] = "trunks";
const char kTrunksGroup[] = "trunks";
#if defined(__ANDROID__)
const char kTrunksSeccompPath[] =
"/system/usr/share/policy/trunksd-seccomp.policy";
#else
const char kTrunksSeccompPath[] = "/usr/share/policy/trunksd-seccomp.policy";
#endif
const char kBackgroundThreadName[] = "trunksd_background_thread";
void InitMinijailSandbox() {
uid_t trunks_uid;
gid_t trunks_gid;
CHECK(brillo::userdb::GetUserInfo(kTrunksUser, &trunks_uid, &trunks_gid))
<< "Error getting trunks uid and gid.";
CHECK_EQ(getuid(), kRootUID) << "trunksd not initialized as root.";
brillo::Minijail* minijail = brillo::Minijail::GetInstance();
struct minijail* jail = minijail->New();
minijail->DropRoot(jail, kTrunksUser, kTrunksGroup);
minijail->UseSeccompFilter(jail, kTrunksSeccompPath);
minijail->Enter(jail);
minijail->Destroy(jail);
CHECK_EQ(getuid(), trunks_uid)
<< "trunksd was not able to drop user privilege.";
CHECK_EQ(getgid(), trunks_gid)
<< "trunksd was not able to drop group privilege.";
}
} // namespace
int main(int argc, char** argv) {
base::CommandLine::Init(argc, argv);
base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
int flags = brillo::kLogToSyslog;
if (cl->HasSwitch("log_to_stderr")) {
flags |= brillo::kLogToStderr;
}
brillo::InitLog(flags);
// Create a service instance before anything else so objects like
// AtExitManager exist.
#if defined(USE_BINDER_IPC)
trunks::TrunksBinderService service;
#else
trunks::TrunksDBusService service;
#endif
// Chain together command transceivers:
// [IPC] --> BackgroundCommandTransceiver
// --> ResourceManager
// --> TpmHandle
// --> [TPM]
trunks::CommandTransceiver* low_level_transceiver;
if (cl->HasSwitch("ftdi")) {
LOG(INFO) << "Sending commands to FTDI SPI.";
low_level_transceiver = new trunks::TrunksFtdiSpi();
} else if (cl->HasSwitch("simulator")) {
LOG(INFO) << "Sending commands to simulator.";
low_level_transceiver = new trunks::TpmSimulatorHandle();
} else {
low_level_transceiver = new trunks::TpmHandle();
}
CHECK(low_level_transceiver->Init())
<< "Error initializing TPM communication.";
// This needs to be *after* opening the TPM handle and *before* starting the
// background thread.
InitMinijailSandbox();
base::Thread background_thread(kBackgroundThreadName);
CHECK(background_thread.Start()) << "Failed to start background thread.";
trunks::TrunksFactoryImpl factory(low_level_transceiver);
trunks::ResourceManager resource_manager(factory, low_level_transceiver);
background_thread.task_runner()->PostNonNestableTask(
FROM_HERE, base::Bind(&trunks::ResourceManager::Initialize,
base::Unretained(&resource_manager)));
trunks::BackgroundCommandTransceiver background_transceiver(
&resource_manager, background_thread.task_runner());
service.set_transceiver(&background_transceiver);
LOG(INFO) << "Trunks service started.";
return service.Run();
}
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