/*
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* Copyright (C) 2018 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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#define LOG_TAG "KeystoreOperation"
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#include "operation_proto_handler.h"
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#include <android/os/DropBoxManager.h>
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#include <google/protobuf/message_lite.h>
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#include <keymasterV4_0/Keymaster.h>
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#include <keystore/keymaster_types.h>
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#include <keystore/keystore_hidl_support.h>
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#include <utils/String16.h>
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#include <utils/StrongPointer.h>
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using namespace std::chrono;
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namespace keystore {
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constexpr auto kCollectionTime = 1h;
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void determinePurpose(KeyPurpose purpose, OperationConfig* operationConfig) {
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switch (purpose) {
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case KeyPurpose::VERIFY:
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operationConfig->set_purpose("verify");
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break;
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case KeyPurpose::ENCRYPT:
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operationConfig->set_purpose("encrypt");
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break;
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case KeyPurpose::SIGN:
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operationConfig->set_purpose("sign");
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break;
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case KeyPurpose::DECRYPT:
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operationConfig->set_purpose("decrypt");
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break;
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case KeyPurpose::WRAP_KEY:
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operationConfig->set_purpose("wrap");
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break;
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default:
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break;
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}
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}
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void checkKeyCharacteristics(const hidl_vec<KeyParameter>& characteristics,
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OperationConfig* operationConfig) {
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for (auto& opParam : characteristics) {
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switch (opParam.tag) {
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case Tag::ALGORITHM:
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operationConfig->set_algorithm(toString(accessTagValue(TAG_ALGORITHM, opParam)));
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break;
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case Tag::KEY_SIZE:
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operationConfig->set_key_size(accessTagValue(TAG_KEY_SIZE, opParam));
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break;
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case Tag::EC_CURVE:
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operationConfig->set_ec_curve(toString(accessTagValue(TAG_EC_CURVE, opParam)));
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break;
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case Tag::AUTH_TIMEOUT:
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operationConfig->set_user_auth_key_timeout(accessTagValue(TAG_AUTH_TIMEOUT, opParam));
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break;
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case Tag::ORIGIN:
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operationConfig->set_origin(toString(accessTagValue(TAG_ORIGIN, opParam)));
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break;
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case Tag::BLOB_USAGE_REQUIREMENTS:
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operationConfig->set_key_blob_usage_reqs(
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toString(accessTagValue(TAG_BLOB_USAGE_REQUIREMENTS, opParam)));
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break;
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case Tag::USER_AUTH_TYPE:
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operationConfig->set_user_auth_type(
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toString(accessTagValue(TAG_USER_AUTH_TYPE, opParam)));
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break;
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default:
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break;
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}
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}
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}
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void checkOpCharacteristics(const hidl_vec<KeyParameter>& characteristics,
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OperationConfig* operationConfig) {
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for (auto& opParam : characteristics) {
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switch (opParam.tag) {
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case Tag::BLOCK_MODE:
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operationConfig->set_block_mode(toString(accessTagValue(TAG_BLOCK_MODE, opParam)));
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break;
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case Tag::PADDING:
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operationConfig->set_padding(toString(accessTagValue(TAG_PADDING, opParam)));
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break;
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case Tag::DIGEST:
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operationConfig->set_digest(toString(accessTagValue(TAG_DIGEST, opParam)));
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break;
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default:
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break;
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}
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}
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}
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void OperationProtoHandler::uploadOpAsProto(Operation& op, bool wasOpSuccessful) {
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std::lock_guard<std::mutex> lock(op_upload_mutex);
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OperationConfig operationConfig;
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determinePurpose(op.purpose, &operationConfig);
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checkKeyCharacteristics(op.characteristics.softwareEnforced, &operationConfig);
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checkKeyCharacteristics(op.characteristics.hardwareEnforced, &operationConfig);
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checkOpCharacteristics(op.params, &operationConfig);
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operationConfig.set_was_op_successful(wasOpSuccessful);
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// Only bother with counting an hour out when an operation entry is actually
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// added
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if (protoMap.empty()) {
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start_time = std::chrono::steady_clock::now();
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}
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auto cur_time = std::chrono::steady_clock::now();
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// Add operations to a map within the time duration of an hour. Deduplicate
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// repeated ops by incrementing the counter of the original one stored and
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// discarding the new one.
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protoMap[operationConfig.SerializeAsString()]++;
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if (cur_time - start_time >= kCollectionTime) {
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// Iterate through the unordered map and dump all the operation protos
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// accumulated over the hour into the holding list proto after setting
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// their counts.
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OperationConfigEvents opConfigEvents;
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for (auto elem : protoMap) {
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OperationConfigEvent* event = opConfigEvents.add_op_config_events();
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event->mutable_op_config()->ParseFromString(elem.first);
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event->set_count(elem.second);
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}
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android::sp<android::os::DropBoxManager> dropbox(new android::os::DropBoxManager);
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size_t size = opConfigEvents.ByteSize();
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auto data = std::make_unique<uint8_t[]>(size);
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opConfigEvents.SerializeWithCachedSizesToArray(data.get());
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dropbox->addData(android::String16("keymaster"), data.get(), size, 0);
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protoMap.clear();
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}
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}
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} // namespace keystore
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