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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/daemons/dbus_daemon.h>
#include <brillo/minijail/minijail.h>
#include <brillo/syslog_logging.h>
#include <brillo/userdb_utils.h>
#include "trunks/background_command_transceiver.h"
#include "trunks/dbus_interface.h"
#include "trunks/resource_manager.h"
#include "trunks/tpm_handle.h"
#include "trunks/tpm_simulator_handle.h"
#include "trunks/trunks_factory_impl.h"
#include "trunks/trunks_ftdi_spi.h"
#include "trunks/trunks_service.h"
using brillo::dbus_utils::AsyncEventSequencer;
namespace {
const uid_t kRootUID = 0;
const char kTrunksUser[] = "trunks";
const char kTrunksGroup[] = "trunks";
const char kTrunksSeccompPath[] = "/usr/share/policy/trunksd-seccomp.policy";
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) << "Trunks Daemon 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)
<< "TrunksDaemon was not able to drop to trunks user.";
CHECK_EQ(getgid(), trunks_gid)
<< "TrunksDaemon was not able to drop to trunks group.";
}
} // namespace
class TrunksDaemon : public brillo::DBusServiceDaemon {
public:
explicit TrunksDaemon(trunks::CommandTransceiver* transceiver) :
brillo::DBusServiceDaemon(trunks::kTrunksServiceName) {
transceiver_.reset(transceiver);
background_thread_.reset(new base::Thread(kBackgroundThreadName));
CHECK(background_thread_->Start());
// Chain together command transceivers:
// [IPC] --> TrunksService --> BackgroundCommandTransceiver -->
// ResourceManager --> TpmHandle --> [TPM]
factory_.reset(new trunks::TrunksFactoryImpl(transceiver_.get()));
resource_manager_.reset(new trunks::ResourceManager(
*factory_,
transceiver_.get()));
background_thread_->message_loop_proxy()->PostNonNestableTask(
FROM_HERE,
base::Bind(&trunks::ResourceManager::Initialize,
base::Unretained(resource_manager_.get())));
background_transceiver_.reset(
new trunks::BackgroundCommandTransceiver(
resource_manager_.get(),
background_thread_->message_loop_proxy()));
}
protected:
void RegisterDBusObjectsAsync(AsyncEventSequencer* sequencer) override {
trunks_service_.reset(new trunks::TrunksService(
bus_,
background_transceiver_.get()));
trunks_service_->Register(
sequencer->GetHandler("Register() failed.", true));
}
private:
std::unique_ptr<trunks::TrunksService> trunks_service_;
std::unique_ptr<trunks::CommandTransceiver> transceiver_;
// Thread for executing TPM comands.
std::unique_ptr<base::Thread> background_thread_;
std::unique_ptr<trunks::TrunksFactory> factory_;
std::unique_ptr<trunks::ResourceManager> resource_manager_;
std::unique_ptr<trunks::CommandTransceiver> background_transceiver_;
DISALLOW_COPY_AND_ASSIGN(TrunksDaemon);
};
int main(int argc, char **argv) {
base::CommandLine::Init(argc, argv);
brillo::InitLog(brillo::kLogToSyslog | brillo::kLogToStderr);
base::CommandLine *cl = base::CommandLine::ForCurrentProcess();
trunks::CommandTransceiver *transceiver;
if (cl->HasSwitch("ftdi")) {
transceiver = new trunks::TrunksFtdiSpi();
} else if (cl->HasSwitch("simulator")) {
transceiver = new trunks::TpmSimulatorHandle();
} else {
transceiver = new trunks::TpmHandle();
}
CHECK(transceiver->Init()) << "Error initializing transceiver";
TrunksDaemon daemon(transceiver);
InitMinijailSandbox();
LOG(INFO) << "Trunks Service Started";
return daemon.Run();
}
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