guest/hals/keymint/remote/remote_keymint_operation.cpp

/*
 * Copyright 2020, 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.
 */

#define LOG_TAG "android.hardware.security.keymint-impl.remote"
#include <log/log.h>

#include "guest/hals/keymint/remote/remote_keymint_operation.h"

#include <aidl/android/hardware/security/keymint/ErrorCode.h>
#include <aidl/android/hardware/security/secureclock/ISecureClock.h>

#include <keymaster/android_keymaster.h>

#include "KeyMintUtils.h"

namespace aidl::android::hardware::security::keymint {

using ::keymaster::AbortOperationRequest;
using ::keymaster::AbortOperationResponse;
using ::keymaster::Buffer;
using ::keymaster::FinishOperationRequest;
using ::keymaster::FinishOperationResponse;
using ::keymaster::TAG_ASSOCIATED_DATA;
using ::keymaster::UpdateOperationRequest;
using ::keymaster::UpdateOperationResponse;
using secureclock::TimeStampToken;
using namespace km_utils;

RemoteKeyMintOperation::RemoteKeyMintOperation(
    ::keymaster::RemoteKeymaster& impl, keymaster_operation_handle_t opHandle)
    : impl_(impl), opHandle_(opHandle) {}

RemoteKeyMintOperation::~RemoteKeyMintOperation() {
  if (opHandle_ != 0) {
    abort();
  }
}

ScopedAStatus RemoteKeyMintOperation::updateAad(
    const vector<uint8_t>& input,
    const optional<HardwareAuthToken>& /* authToken */,
    const optional<TimeStampToken>& /* timestampToken */) {
  UpdateOperationRequest request(impl_.message_version());
  request.op_handle = opHandle_;
  request.additional_params.push_back(TAG_ASSOCIATED_DATA, input.data(),
                                      input.size());

  UpdateOperationResponse response(impl_.message_version());
  impl_.UpdateOperation(request, &response);

  return kmError2ScopedAStatus(response.error);
}

ScopedAStatus RemoteKeyMintOperation::update(
    const vector<uint8_t>& input,
    const optional<HardwareAuthToken>& /* authToken */,
    const optional<TimeStampToken>&
    /* timestampToken */,
    vector<uint8_t>* output) {
  if (!output) return kmError2ScopedAStatus(KM_ERROR_OUTPUT_PARAMETER_NULL);

  UpdateOperationRequest request(impl_.message_version());
  request.op_handle = opHandle_;
  request.input.Reinitialize(input.data(), input.size());

  UpdateOperationResponse response(impl_.message_version());
  impl_.UpdateOperation(request, &response);

  if (response.error != KM_ERROR_OK)
    return kmError2ScopedAStatus(response.error);
  if (response.input_consumed != request.input.buffer_size()) {
    return kmError2ScopedAStatus(KM_ERROR_UNKNOWN_ERROR);
  }

  *output = kmBuffer2vector(response.output);
  return ScopedAStatus::ok();
}

ScopedAStatus RemoteKeyMintOperation::finish(
    const optional<vector<uint8_t>>& input,      //
    const optional<vector<uint8_t>>& signature,  //
    const optional<HardwareAuthToken>& /* authToken */,
    const optional<TimeStampToken>& /* timestampToken */,
    const optional<vector<uint8_t>>& /* confirmationToken */,
    vector<uint8_t>* output) {
  if (!output) {
    return ScopedAStatus(AStatus_fromServiceSpecificError(
        static_cast<int32_t>(ErrorCode::OUTPUT_PARAMETER_NULL)));
  }

  FinishOperationRequest request(impl_.message_version());
  request.op_handle = opHandle_;
  if (input) request.input.Reinitialize(input->data(), input->size());
  if (signature)
    request.signature.Reinitialize(signature->data(), signature->size());

  FinishOperationResponse response(impl_.message_version());
  impl_.FinishOperation(request, &response);
  opHandle_ = 0;

  if (response.error != KM_ERROR_OK)
    return kmError2ScopedAStatus(response.error);

  *output = kmBuffer2vector(response.output);
  return ScopedAStatus::ok();
}

ScopedAStatus RemoteKeyMintOperation::abort() {
  AbortOperationRequest request(impl_.message_version());
  request.op_handle = opHandle_;

  AbortOperationResponse response(impl_.message_version());
  impl_.AbortOperation(request, &response);
  opHandle_ = 0;

  return kmError2ScopedAStatus(response.error);
}

}  // namespace aidl::android::hardware::security::keymint