250 lines
11 KiB
C++
250 lines
11 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Keymaster.h"
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#include <android-base/logging.h>
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#include <hardware/hardware.h>
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#include <hardware/keymaster1.h>
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#include <hardware/keymaster2.h>
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namespace android {
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namespace vold {
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class IKeymasterDevice {
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public:
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IKeymasterDevice() {}
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virtual ~IKeymasterDevice() {}
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virtual keymaster_error_t generate_key(const keymaster_key_param_set_t* params,
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keymaster_key_blob_t* key_blob) const = 0;
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virtual keymaster_error_t delete_key(const keymaster_key_blob_t* key) const = 0;
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virtual keymaster_error_t begin(keymaster_purpose_t purpose, const keymaster_key_blob_t* key,
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const keymaster_key_param_set_t* in_params,
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keymaster_key_param_set_t* out_params,
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keymaster_operation_handle_t* operation_handle) const = 0;
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virtual keymaster_error_t update(keymaster_operation_handle_t operation_handle,
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const keymaster_key_param_set_t* in_params,
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const keymaster_blob_t* input, size_t* input_consumed,
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keymaster_key_param_set_t* out_params,
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keymaster_blob_t* output) const = 0;
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virtual keymaster_error_t finish(keymaster_operation_handle_t operation_handle,
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const keymaster_key_param_set_t* in_params,
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const keymaster_blob_t* signature,
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keymaster_key_param_set_t* out_params,
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keymaster_blob_t* output) const = 0;
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virtual keymaster_error_t abort(keymaster_operation_handle_t operation_handle) const = 0;
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protected:
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DISALLOW_COPY_AND_ASSIGN(IKeymasterDevice);
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};
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template <typename T> class KeymasterDevice : public IKeymasterDevice {
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public:
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explicit KeymasterDevice(T* d) : mDevice{d} {}
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keymaster_error_t generate_key(const keymaster_key_param_set_t* params,
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keymaster_key_blob_t* key_blob) const override final {
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return mDevice->generate_key(mDevice, params, key_blob, nullptr);
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}
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keymaster_error_t delete_key(const keymaster_key_blob_t* key) const override final {
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if (mDevice->delete_key == nullptr) return KM_ERROR_OK;
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return mDevice->delete_key(mDevice, key);
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}
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keymaster_error_t begin(keymaster_purpose_t purpose, const keymaster_key_blob_t* key,
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const keymaster_key_param_set_t* in_params,
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keymaster_key_param_set_t* out_params,
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keymaster_operation_handle_t* operation_handle) const override final {
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return mDevice->begin(mDevice, purpose, key, in_params, out_params, operation_handle);
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}
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keymaster_error_t update(keymaster_operation_handle_t operation_handle,
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const keymaster_key_param_set_t* in_params,
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const keymaster_blob_t* input, size_t* input_consumed,
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keymaster_key_param_set_t* out_params,
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keymaster_blob_t* output) const override final {
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return mDevice->update(mDevice, operation_handle, in_params, input, input_consumed,
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out_params, output);
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}
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keymaster_error_t abort(keymaster_operation_handle_t operation_handle) const override final {
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return mDevice->abort(mDevice, operation_handle);
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}
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protected:
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T* const mDevice;
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};
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class Keymaster1Device : public KeymasterDevice<keymaster1_device_t> {
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public:
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explicit Keymaster1Device(keymaster1_device_t* d) : KeymasterDevice<keymaster1_device_t>{d} {}
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~Keymaster1Device() override final { keymaster1_close(mDevice); }
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keymaster_error_t finish(keymaster_operation_handle_t operation_handle,
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const keymaster_key_param_set_t* in_params,
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const keymaster_blob_t* signature,
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keymaster_key_param_set_t* out_params,
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keymaster_blob_t* output) const override final {
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return mDevice->finish(mDevice, operation_handle, in_params, signature, out_params, output);
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}
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};
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class Keymaster2Device : public KeymasterDevice<keymaster2_device_t> {
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public:
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explicit Keymaster2Device(keymaster2_device_t* d) : KeymasterDevice<keymaster2_device_t>{d} {}
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~Keymaster2Device() override final { keymaster2_close(mDevice); }
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keymaster_error_t finish(keymaster_operation_handle_t operation_handle,
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const keymaster_key_param_set_t* in_params,
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const keymaster_blob_t* signature,
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keymaster_key_param_set_t* out_params,
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keymaster_blob_t* output) const override final {
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return mDevice->finish(mDevice, operation_handle, in_params, nullptr, signature, out_params,
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output);
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}
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};
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KeymasterOperation::~KeymasterOperation() {
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if (mDevice) mDevice->abort(mOpHandle);
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}
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bool KeymasterOperation::updateCompletely(const std::string& input, std::string* output) {
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output->clear();
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auto it = input.begin();
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while (it != input.end()) {
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size_t toRead = static_cast<size_t>(input.end() - it);
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keymaster_blob_t inputBlob{reinterpret_cast<const uint8_t*>(&*it), toRead};
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keymaster_blob_t outputBlob;
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size_t inputConsumed;
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auto error =
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mDevice->update(mOpHandle, nullptr, &inputBlob, &inputConsumed, nullptr, &outputBlob);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "update failed, code " << error;
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mDevice = nullptr;
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return false;
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}
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output->append(reinterpret_cast<const char*>(outputBlob.data), outputBlob.data_length);
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free(const_cast<uint8_t*>(outputBlob.data));
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if (inputConsumed > toRead) {
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LOG(ERROR) << "update reported too much input consumed";
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mDevice = nullptr;
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return false;
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}
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it += inputConsumed;
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}
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return true;
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}
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bool KeymasterOperation::finish() {
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auto error = mDevice->finish(mOpHandle, nullptr, nullptr, nullptr, nullptr);
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mDevice = nullptr;
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "finish failed, code " << error;
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return false;
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}
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return true;
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}
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bool KeymasterOperation::finishWithOutput(std::string* output) {
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keymaster_blob_t outputBlob;
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auto error = mDevice->finish(mOpHandle, nullptr, nullptr, nullptr, &outputBlob);
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mDevice = nullptr;
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "finish failed, code " << error;
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return false;
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}
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output->assign(reinterpret_cast<const char*>(outputBlob.data), outputBlob.data_length);
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free(const_cast<uint8_t*>(outputBlob.data));
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return true;
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}
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Keymaster::Keymaster() {
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mDevice = nullptr;
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const hw_module_t* module;
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int ret = hw_get_module_by_class(KEYSTORE_HARDWARE_MODULE_ID, NULL, &module);
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if (ret != 0) {
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LOG(ERROR) << "hw_get_module_by_class returned " << ret;
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return;
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}
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if (module->module_api_version == KEYMASTER_MODULE_API_VERSION_1_0) {
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keymaster1_device_t* device;
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ret = keymaster1_open(module, &device);
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if (ret != 0) {
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LOG(ERROR) << "keymaster1_open returned " << ret;
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return;
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}
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mDevice = std::make_shared<Keymaster1Device>(device);
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} else if (module->module_api_version == KEYMASTER_MODULE_API_VERSION_2_0) {
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keymaster2_device_t* device;
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ret = keymaster2_open(module, &device);
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if (ret != 0) {
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LOG(ERROR) << "keymaster2_open returned " << ret;
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return;
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}
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mDevice = std::make_shared<Keymaster2Device>(device);
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} else {
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LOG(ERROR) << "module_api_version is " << module->module_api_version;
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return;
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}
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}
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bool Keymaster::generateKey(const keymaster::AuthorizationSet& inParams, std::string* key) {
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keymaster_key_blob_t keyBlob;
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auto error = mDevice->generate_key(&inParams, &keyBlob);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "generate_key failed, code " << error;
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return false;
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}
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key->assign(reinterpret_cast<const char*>(keyBlob.key_material), keyBlob.key_material_size);
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free(const_cast<uint8_t*>(keyBlob.key_material));
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return true;
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}
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bool Keymaster::deleteKey(const std::string& key) {
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keymaster_key_blob_t keyBlob{reinterpret_cast<const uint8_t*>(key.data()), key.size()};
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auto error = mDevice->delete_key(&keyBlob);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "delete_key failed, code " << error;
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return false;
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}
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return true;
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}
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KeymasterOperation Keymaster::begin(keymaster_purpose_t purpose, const std::string& key,
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const keymaster::AuthorizationSet& inParams,
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keymaster::AuthorizationSet* outParams) {
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keymaster_key_blob_t keyBlob{reinterpret_cast<const uint8_t*>(key.data()), key.size()};
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keymaster_operation_handle_t mOpHandle;
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keymaster_key_param_set_t outParams_set;
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auto error = mDevice->begin(purpose, &keyBlob, &inParams, &outParams_set, &mOpHandle);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "begin failed, code " << error;
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return KeymasterOperation(nullptr, mOpHandle);
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}
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outParams->Clear();
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outParams->push_back(outParams_set);
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keymaster_free_param_set(&outParams_set);
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return KeymasterOperation(mDevice, mOpHandle);
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}
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KeymasterOperation Keymaster::begin(keymaster_purpose_t purpose, const std::string& key,
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const keymaster::AuthorizationSet& inParams) {
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keymaster_key_blob_t keyBlob{reinterpret_cast<const uint8_t*>(key.data()), key.size()};
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keymaster_operation_handle_t mOpHandle;
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auto error = mDevice->begin(purpose, &keyBlob, &inParams, nullptr, &mOpHandle);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "begin failed, code " << error;
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return KeymasterOperation(nullptr, mOpHandle);
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}
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return KeymasterOperation(mDevice, mOpHandle);
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}
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} // namespace vold
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} // namespace android
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