//
// 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.
//

// trunks_client is a command line tool that supports various TPM operations. It
// does not provide direct access to the trunksd D-Bus interface.

#include <stdio.h>
#include <memory>
#include <string>

#include <base/command_line.h>
#include <base/logging.h>
#include <base/strings/string_number_conversions.h>
#include <brillo/syslog_logging.h>

#include "trunks/error_codes.h"
#include "trunks/hmac_session.h"
#include "trunks/password_authorization_delegate.h"
#include "trunks/policy_session.h"
#include "trunks/scoped_key_handle.h"
#include "trunks/tpm_state.h"
#include "trunks/tpm_utility.h"
#include "trunks/trunks_client_test.h"
#include "trunks/trunks_factory_impl.h"

namespace {

using trunks::CommandTransceiver;
using trunks::TrunksFactory;
using trunks::TrunksFactoryImpl;

void PrintUsage() {
  puts("Options:");
  puts("  --allocate_pcr - Configures PCR 0-15 under the SHA256 bank.");
  puts("  --clear - Clears the TPM. Use before initializing the TPM.");
  puts("  --help - Prints this message.");
  puts("  --init_tpm - Initializes a TPM as CrOS firmware does.");
  puts("  --own - Takes ownership of the TPM with the provided password.");
  puts("  --owner_password - used to provide an owner password");
  puts("  --regression_test - Runs some basic regression tests. If");
  puts("                      owner_password is supplied, it runs tests that");
  puts("                      need owner permissions.");
  puts("  --startup - Performs startup and self-tests.");
  puts("  --status - Prints TPM status information.");
  puts("  --stress_test - Runs some basic stress tests.");
  puts("  --read_pcr --index=<N> - Reads a PCR and prints the value.");
  puts("  --extend_pcr --index=<N> --value=<value> - Extends a PCR.");
}

std::string HexEncode(const std::string& bytes) {
  return base::HexEncode(bytes.data(), bytes.size());
}

int Startup(const TrunksFactory& factory) {
  factory.GetTpmUtility()->Shutdown();
  return factory.GetTpmUtility()->Startup();
}

int Clear(const TrunksFactory& factory) {
  return factory.GetTpmUtility()->Clear();
}

int InitializeTpm(const TrunksFactory& factory) {
  return factory.GetTpmUtility()->InitializeTpm();
}

int AllocatePCR(const TrunksFactory& factory) {
  trunks::TPM_RC result;
  result = factory.GetTpmUtility()->AllocatePCR("");
  if (result != trunks::TPM_RC_SUCCESS) {
    LOG(ERROR) << "Error allocating PCR:" << trunks::GetErrorString(result);
    return result;
  }
  factory.GetTpmUtility()->Shutdown();
  return factory.GetTpmUtility()->Startup();
}

int TakeOwnership(const std::string& owner_password,
                  const TrunksFactory& factory) {
  trunks::TPM_RC rc;
  rc = factory.GetTpmUtility()->TakeOwnership(owner_password, owner_password,
                                              owner_password);
  if (rc) {
    LOG(ERROR) << "Error taking ownership: " << trunks::GetErrorString(rc);
    return rc;
  }
  return 0;
}

int DumpStatus(const TrunksFactory& factory) {
  std::unique_ptr<trunks::TpmState> state = factory.GetTpmState();
  trunks::TPM_RC result = state->Initialize();
  if (result != trunks::TPM_RC_SUCCESS) {
    LOG(ERROR) << "Failed to read TPM state: "
               << trunks::GetErrorString(result);
    return result;
  }
  printf("Owner password set: %s\n",
         state->IsOwnerPasswordSet() ? "true" : "false");
  printf("Endorsement password set: %s\n",
         state->IsEndorsementPasswordSet() ? "true" : "false");
  printf("Lockout password set: %s\n",
         state->IsLockoutPasswordSet() ? "true" : "false");
  printf("Ownership status: %s\n", state->IsOwned() ? "true" : "false");
  printf("In lockout: %s\n", state->IsInLockout() ? "true" : "false");
  printf("Platform hierarchy enabled: %s\n",
         state->IsPlatformHierarchyEnabled() ? "true" : "false");
  printf("Storage hierarchy enabled: %s\n",
         state->IsStorageHierarchyEnabled() ? "true" : "false");
  printf("Endorsement hierarchy enabled: %s\n",
         state->IsEndorsementHierarchyEnabled() ? "true" : "false");
  printf("Is Tpm enabled: %s\n", state->IsEnabled() ? "true" : "false");
  printf("Was shutdown orderly: %s\n",
         state->WasShutdownOrderly() ? "true" : "false");
  printf("Is RSA supported: %s\n", state->IsRSASupported() ? "true" : "false");
  printf("Is ECC supported: %s\n", state->IsECCSupported() ? "true" : "false");
  printf("Lockout Counter: %u\n", state->GetLockoutCounter());
  printf("Lockout Threshold: %u\n", state->GetLockoutThreshold());
  printf("Lockout Interval: %u\n", state->GetLockoutInterval());
  printf("Lockout Recovery: %u\n", state->GetLockoutRecovery());
  return 0;
}

int ReadPCR(const TrunksFactory& factory, int index) {
  std::unique_ptr<trunks::TpmUtility> tpm_utility = factory.GetTpmUtility();
  std::string value;
  trunks::TPM_RC result = tpm_utility->ReadPCR(index, &value);
  if (result) {
    LOG(ERROR) << "ReadPCR: " << trunks::GetErrorString(result);
    return result;
  }
  printf("PCR Value: %s\n", HexEncode(value).c_str());
  return 0;
}

int ExtendPCR(const TrunksFactory& factory,
              int index,
              const std::string& value) {
  std::unique_ptr<trunks::TpmUtility> tpm_utility = factory.GetTpmUtility();
  trunks::TPM_RC result = tpm_utility->ExtendPCR(index, value, nullptr);
  if (result) {
    LOG(ERROR) << "ExtendPCR: " << trunks::GetErrorString(result);
    return result;
  }
  return 0;
}

}  // namespace

int main(int argc, char** argv) {
  base::CommandLine::Init(argc, argv);
  brillo::InitLog(brillo::kLogToStderr);
  base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
  if (cl->HasSwitch("help")) {
    puts("Trunks Client: A command line tool to access the TPM.");
    PrintUsage();
    return 0;
  }

  TrunksFactoryImpl factory;
  CHECK(factory.Initialize()) << "Failed to initialize trunks factory.";

  if (cl->HasSwitch("status")) {
    return DumpStatus(factory);
  }
  if (cl->HasSwitch("startup")) {
    return Startup(factory);
  }
  if (cl->HasSwitch("clear")) {
    return Clear(factory);
  }
  if (cl->HasSwitch("init_tpm")) {
    return InitializeTpm(factory);
  }
  if (cl->HasSwitch("allocate_pcr")) {
    return AllocatePCR(factory);
  }

  if (cl->HasSwitch("own")) {
    return TakeOwnership(cl->GetSwitchValueASCII("owner_password"), factory);
  }
  if (cl->HasSwitch("regression_test")) {
    trunks::TrunksClientTest test(factory);
    LOG(INFO) << "Running RNG test.";
    if (!test.RNGTest()) {
      LOG(ERROR) << "Error running RNGtest.";
      return -1;
    }
    LOG(INFO) << "Running RSA key tests.";
    if (!test.SignTest()) {
      LOG(ERROR) << "Error running SignTest.";
      return -1;
    }
    if (!test.DecryptTest()) {
      LOG(ERROR) << "Error running DecryptTest.";
      return -1;
    }
    if (!test.ImportTest()) {
      LOG(ERROR) << "Error running ImportTest.";
      return -1;
    }
    if (!test.AuthChangeTest()) {
      LOG(ERROR) << "Error running AuthChangeTest.";
      return -1;
    }
    if (!test.VerifyKeyCreationTest()) {
      LOG(ERROR) << "Error running VerifyKeyCreationTest.";
      return -1;
    }
    LOG(INFO) << "Running Sealed Data test.";
    if (!test.SealedDataTest()) {
      LOG(ERROR) << "Error running SealedDataTest.";
      return -1;
    }
    LOG(INFO) << "Running PCR test.";
    if (!test.PCRTest()) {
      LOG(ERROR) << "Error running PCRTest.";
      return -1;
    }
    LOG(INFO) << "Running policy tests.";
    if (!test.PolicyAuthValueTest()) {
      LOG(ERROR) << "Error running PolicyAuthValueTest.";
      return -1;
    }
    if (!test.PolicyAndTest()) {
      LOG(ERROR) << "Error running PolicyAndTest.";
      return -1;
    }
    if (!test.PolicyOrTest()) {
      LOG(ERROR) << "Error running PolicyOrTest.";
      return -1;
    }
    if (cl->HasSwitch("owner_password")) {
      std::string owner_password = cl->GetSwitchValueASCII("owner_password");
      LOG(INFO) << "Running NVRAM test.";
      if (!test.NvramTest(owner_password)) {
        LOG(ERROR) << "Error running NvramTest.";
        return -1;
      }
    }
    LOG(INFO) << "All tests were run successfully.";
    return 0;
  }
  if (cl->HasSwitch("stress_test")) {
    LOG(INFO) << "Running stress tests.";
    trunks::TrunksClientTest test(factory);
    if (!test.ManyKeysTest()) {
      LOG(ERROR) << "Error running ManyKeysTest.";
      return -1;
    }
    if (!test.ManySessionsTest()) {
      LOG(ERROR) << "Error running ManySessionsTest.";
      return -1;
    }
    return 0;
  }
  if (cl->HasSwitch("read_pcr") && cl->HasSwitch("index")) {
    return ReadPCR(factory, atoi(cl->GetSwitchValueASCII("index").c_str()));
  }
  if (cl->HasSwitch("extend_pcr") && cl->HasSwitch("index") &&
      cl->HasSwitch("value")) {
    return ExtendPCR(factory, atoi(cl->GetSwitchValueASCII("index").c_str()),
                     cl->GetSwitchValueASCII("value"));
  }
  puts("Invalid options!");
  PrintUsage();
  return -1;
}