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/*
* 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 "javacard.keymint.device.strongbox-impl"
#include "JavacardSecureElement.h"
#include <algorithm>
#include <iostream>
#include <iterator>
#include <memory>
#include <regex.h>
#include <string>
#include <vector>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <keymaster/android_keymaster_messages.h>
#include "keymint_utils.h"
namespace keymint::javacard {
keymaster_error_t JavacardSecureElement::initializeJavacard() {
Array request;
request.add(Uint(getOsVersion()));
request.add(Uint(getOsPatchlevel()));
request.add(Uint(getVendorPatchlevel()));
auto [item, err] = sendRequest(Instruction::INS_INIT_STRONGBOX_CMD, request);
return err;
}
void JavacardSecureElement::setDeleteAllKeysPending() {
isDeleteAllKeysPending = true;
}
void JavacardSecureElement::setEarlyBootEndedPending() {
isEarlyBootEndedPending = true;
}
void JavacardSecureElement::sendPendingEvents() {
if (isDeleteAllKeysPending) {
auto [_, err] = sendRequest(Instruction::INS_DELETE_ALL_KEYS_CMD);
if (err == KM_ERROR_OK) {
isDeleteAllKeysPending = false;
} else {
LOG(ERROR) << "Error in sending deleteAllKeys.";
}
}
if (isEarlyBootEndedPending) {
auto [_, err] = sendRequest(Instruction::INS_EARLY_BOOT_ENDED_CMD);
if (err == KM_ERROR_OK) {
isEarlyBootEndedPending = false;
} else {
LOG(ERROR) << "Error in sending earlyBootEnded.";
}
}
}
keymaster_error_t JavacardSecureElement::constructApduMessage(Instruction& ins,
std::vector<uint8_t>& inputData,
std::vector<uint8_t>& apduOut) {
apduOut.push_back(static_cast<uint8_t>(APDU_CLS)); // CLS
apduOut.push_back(static_cast<uint8_t>(ins)); // INS
apduOut.push_back(static_cast<uint8_t>(APDU_P1)); // P1
apduOut.push_back(static_cast<uint8_t>(APDU_P2)); // P2
if (USHRT_MAX >= inputData.size()) {
// Send extended length APDU always as response size is not known to HAL.
// Case 1: Lc > 0 CLS | INS | P1 | P2 | 00 | 2 bytes of Lc | CommandData |
// 2 bytes of Le all set to 00. Case 2: Lc = 0 CLS | INS | P1 | P2 | 3
// bytes of Le all set to 00. Extended length 3 bytes, starts with 0x00
apduOut.push_back(static_cast<uint8_t>(0x00));
if (inputData.size() > 0) {
apduOut.push_back(static_cast<uint8_t>(inputData.size() >> 8));
apduOut.push_back(static_cast<uint8_t>(inputData.size() & 0xFF));
// Data
apduOut.insert(apduOut.end(), inputData.begin(), inputData.end());
}
// Expected length of output.
// Accepting complete length of output every time.
apduOut.push_back(static_cast<uint8_t>(0x00));
apduOut.push_back(static_cast<uint8_t>(0x00));
} else {
LOG(ERROR) << "Error in constructApduMessage.";
return (KM_ERROR_INVALID_INPUT_LENGTH);
}
return (KM_ERROR_OK); // success
}
keymaster_error_t JavacardSecureElement::sendData(Instruction ins, std::vector<uint8_t>& inData,
std::vector<uint8_t>& response) {
keymaster_error_t ret = KM_ERROR_UNKNOWN_ERROR;
std::vector<uint8_t> apdu;
ret = constructApduMessage(ins, inData, apdu);
if (ret != KM_ERROR_OK) {
return ret;
}
if (!transport_->sendData(apdu, response)) {
LOG(ERROR) << "Error in sending data in sendData.";
return (KM_ERROR_SECURE_HW_COMMUNICATION_FAILED);
}
// Response size should be greater than 2. Cbor output data followed by two
// bytes of APDU status.
if ((response.size() <= 2) || (getApduStatus(response) != APDU_RESP_STATUS_OK)) {
LOG(ERROR) << "Response of the sendData is wrong: response size = " << response.size()
<< " apdu status = " << getApduStatus(response);
return (KM_ERROR_UNKNOWN_ERROR);
}
// remove the status bytes
response.pop_back();
response.pop_back();
return (KM_ERROR_OK); // success
}
std::tuple<std::unique_ptr<Item>, keymaster_error_t>
JavacardSecureElement::sendRequest(Instruction ins, Array& request) {
vector<uint8_t> response;
// encode request
std::vector<uint8_t> command = request.encode();
auto sendError = sendData(ins, command, response);
if (sendError != KM_ERROR_OK) {
return {unique_ptr<Item>(nullptr), sendError};
}
// decode the response and send that back
return cbor_.decodeData(response);
}
std::tuple<std::unique_ptr<Item>, keymaster_error_t>
JavacardSecureElement::sendRequest(Instruction ins, std::vector<uint8_t>& command) {
vector<uint8_t> response;
auto sendError = sendData(ins, command, response);
if (sendError != KM_ERROR_OK) {
return {unique_ptr<Item>(nullptr), sendError};
}
// decode the response and send that back
return cbor_.decodeData(response);
}
std::tuple<std::unique_ptr<Item>, keymaster_error_t>
JavacardSecureElement::sendRequest(Instruction ins) {
vector<uint8_t> response;
vector<uint8_t> emptyRequest;
auto sendError = sendData(ins, emptyRequest, response);
if (sendError != KM_ERROR_OK) {
return {unique_ptr<Item>(nullptr), sendError};
}
// decode the response and send that back
return cbor_.decodeData(response);
}
} // namespace keymint::javacard
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