| // Copyright 2021 The Chromium OS 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 <string> |
| |
| #include <base/logging.h> |
| #include <base/posix/eintr_wrapper.h> |
| #include <brillo/userdb_utils.h> |
| #include <linux/vtpm_proxy.h> |
| #include <tpm2/tpm_simulator.hpp> |
| |
| #include "tpm2-simulator/tpm_command_utils.h" |
| #include "tpm2-simulator/tpm_executor_tpm2_impl.h" |
| |
| namespace { |
| |
| constexpr char kSimulatorUser[] = "tpm2-simulator"; |
| constexpr char kNVChipPath[] = "NVChip"; |
| |
| } // namespace |
| |
| namespace tpm2_simulator { |
| |
| void TpmExecutorTpm2Impl::InitializeVTPM() { |
| // Initialize TPM. |
| tpm2::_plat__Signal_PowerOn(); |
| /* |
| * Make sure NV RAM metadata is initialized, needed to check |
| * manufactured status. This is a speculative call which will have to |
| * be repeated in case the TPM has not been through the manufacturing |
| * sequence yet. No harm in calling it twice in that case. |
| */ |
| tpm2::_TPM_Init(); |
| tpm2::_plat__SetNvAvail(); |
| |
| if (!tpm2::tpm_manufactured()) { |
| tpm2::TPM_Manufacture(true); |
| // TODO(b/132145000): Verify if the second call to _TPM_Init() is necessary. |
| tpm2::_TPM_Init(); |
| if (!tpm2::tpm_endorse()) |
| LOG(ERROR) << __func__ << " Failed to endorse TPM with a fixed key."; |
| } |
| |
| uid_t uid; |
| gid_t gid; |
| if (!brillo::userdb::GetUserInfo(kSimulatorUser, &uid, &gid)) { |
| LOG(ERROR) << "Failed to lookup the user name."; |
| return; |
| } |
| if (HANDLE_EINTR(chown(kNVChipPath, uid, gid)) < 0) { |
| PLOG(ERROR) << "Failed to chown the NVChip."; |
| return; |
| } |
| |
| LOG(INFO) << "vTPM Initialize."; |
| } |
| |
| size_t TpmExecutorTpm2Impl::GetCommandSize(const std::string& command) { |
| uint32_t size; |
| if (!ExtractCommandSize(command, &size)) { |
| LOG(ERROR) << "Command too small."; |
| return command.size(); |
| } |
| return size; |
| } |
| |
| std::string TpmExecutorTpm2Impl::RunCommand(const std::string& command) { |
| // TODO(yich): ExecuteCommand would mutate the command buffer, so we created a |
| // copy of the input command at here. |
| std::string command_copy = command; |
| unsigned char* command_ptr = |
| reinterpret_cast<unsigned char*>(command_copy.data()); |
| |
| CommandHeader header; |
| if (!ExtractCommandHeader(command, &header)) { |
| LOG(ERROR) << "Command too small."; |
| return CreateCommandWithCode(TPM_RC_SUCCESS); |
| } |
| |
| if (header.code == TPM2_CC_SET_LOCALITY) { |
| // Ignoring TPM2_CC_SET_LOCALITY command. |
| return CreateCommandWithCode(TPM_RC_SUCCESS); |
| } |
| |
| unsigned int response_size; |
| unsigned char* response; |
| tpm2::ExecuteCommand(command.size(), command_ptr, &response_size, &response); |
| return std::string(reinterpret_cast<char*>(response), response_size); |
| } |
| |
| } // namespace tpm2_simulator |