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/*
* Copyright (C) 2017 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.
*/
#include "OemLock.h"
#include <vector>
#include <android-base/logging.h>
#include "../apps/boot/include/ese/app/boot.h"
#include "ScopedEseConnection.h"
namespace android {
namespace esed {
// libhidl
using ::android::hardware::Void;
// Methods from ::android::hardware::oemlock::V1_0::IOemLock follow.
Return<void> OemLock::getName(getName_cb _hidl_cb) {
_hidl_cb(OemLockStatus::OK, {"01"});
return Void();
}
Return<OemLockSecureStatus> OemLock::setOemUnlockAllowedByCarrier(
bool allowed, const hidl_vec<uint8_t>& signature) {
LOG(INFO) << "Running OemLock::setOemUnlockAllowedByCarrier: " << allowed;
ScopedEseConnection ese{mEse};
ese.init();
// In general, setting the carrier lock to locked is only done in factory,
// but there is no reason the HAL could not be used in factory to do it.
// As such, the signature would actually be a specially formatted string of
// identifiers. Unlocking requires a signature packaged in a simple format
// as well.
//
// See ../apps/boot/README.md for details.
std::vector<uint8_t> data(signature);
// "allowed" == unlocked == 0.
uint8_t lock_byte = allowed ? 0 : 1;
// xset expects the lock value as the first byte.
data.insert(data.cbegin(), lock_byte);
// Open SE session for applet
EseBootSession session;
ese_boot_session_init(&session);
EseAppResult res = ese_boot_session_open(mEse.ese_interface(), &session);
if (res != ESE_APP_RESULT_OK) {
LOG(ERROR) << "Failed to open a boot session: " << res;
return OemLockSecureStatus::FAILED;
}
res = ese_boot_lock_xset(&session, kEseBootLockIdCarrier,
data.data(), data.size());
if (res != ESE_APP_RESULT_OK) {
LOG(ERROR) << "Failed to change lock state (allowed="
<< allowed << "): " << res;
}
// Try and close the session without perturbing our result value.
if (ese_boot_session_close(&session) != ESE_APP_RESULT_OK) {
LOG(WARNING) << "Failed to close boot session";
}
if (EseAppResultValue(res) == ESE_APP_RESULT_ERROR_APPLET) {
// 0004 and 0005 are invalid signature and invalid nonce respectively.
return OemLockSecureStatus::INVALID_SIGNATURE;
} else if (res != ESE_APP_RESULT_OK) {
return OemLockSecureStatus::FAILED;
}
return OemLockSecureStatus::OK;
}
Return<void> OemLock::isOemUnlockAllowedByCarrier(isOemUnlockAllowedByCarrier_cb _hidl_cb) {
LOG(VERBOSE) << "Running OemLock::isOemUnlockAllowedByCarrier";
ScopedEseConnection ese{mEse};
ese.init();
// Open SE session for applet
EseBootSession session;
ese_boot_session_init(&session);
EseAppResult res = ese_boot_session_open(mEse.ese_interface(), &session);
if (res != ESE_APP_RESULT_OK) {
LOG(ERROR) << "Failed to open a boot session: " << res;
_hidl_cb(OemLockStatus::FAILED, false);
return Void();
}
std::vector<uint8_t> data;
data.resize(1024);
uint16_t actualData = 0;
res = ese_boot_lock_xget(&session, kEseBootLockIdCarrier,
&data[0], data.size(),
&actualData);
if (res != ESE_APP_RESULT_OK || actualData == 0) {
LOG(ERROR) << "Failed to get lock state: " << res;
}
// Try and close the session without perturbing our result value.
if (ese_boot_session_close(&session) != ESE_APP_RESULT_OK) {
LOG(WARNING) << "Failed to close boot session";
}
if (res != ESE_APP_RESULT_OK) {
// Fail closed.
_hidl_cb(OemLockStatus::FAILED, false);
return Void();
}
// if data[0] == 1, lock == true, so allowed == false.
_hidl_cb(OemLockStatus::OK, data[0] != 0 ? false : true);
return Void();
}
Return<OemLockStatus> OemLock::setOemUnlockAllowedByDevice(bool allowed) {
LOG(INFO) << "Running OemLock::setOemUnlockAllowedByDevice: " << allowed;
ScopedEseConnection ese{mEse};
ese.init();
// "allowed" == unlocked == 0.
uint8_t lock_byte = allowed ? 0 : 1;
// Open SE session for applet
EseBootSession session;
ese_boot_session_init(&session);
EseAppResult res = ese_boot_session_open(mEse.ese_interface(), &session);
if (res != ESE_APP_RESULT_OK) {
LOG(ERROR) << "Failed to open a boot session: " << res;
return OemLockStatus::FAILED;
}
res = ese_boot_lock_set(&session, kEseBootLockIdDevice, lock_byte);
if (res != ESE_APP_RESULT_OK) {
LOG(ERROR) << "Failed to change device lock state (allowed="
<< allowed << "): " << res;
}
// Try and close the session without perturbing our result value.
if (ese_boot_session_close(&session) != ESE_APP_RESULT_OK) {
LOG(WARNING) << "Failed to close boot session";
}
if (res != ESE_APP_RESULT_OK) {
return OemLockStatus::FAILED;
}
return OemLockStatus::OK;
}
Return<void> OemLock::isOemUnlockAllowedByDevice(isOemUnlockAllowedByDevice_cb _hidl_cb) {
LOG(VERBOSE) << "Running OemLock::isOemUnlockAllowedByDevice";
ScopedEseConnection ese{mEse};
ese.init();
// Open SE session for applet
EseBootSession session;
ese_boot_session_init(&session);
EseAppResult res = ese_boot_session_open(mEse.ese_interface(), &session);
if (res != ESE_APP_RESULT_OK) {
LOG(ERROR) << "Failed to open a boot session: " << res;
_hidl_cb(OemLockStatus::FAILED, false);
return Void();
}
uint8_t lock_byte = 0;
res = ese_boot_lock_get(&session, kEseBootLockIdDevice, &lock_byte);
if (res != ESE_APP_RESULT_OK) {
LOG(ERROR) << "Failed to get device lock state: " << res;
}
// Try and close the session without perturbing our result value.
if (ese_boot_session_close(&session) != ESE_APP_RESULT_OK) {
LOG(WARNING) << "Failed to close boot session";
}
if (res != ESE_APP_RESULT_OK) {
// Fail closed.
_hidl_cb(OemLockStatus::FAILED, false);
return Void();
}
// if data[0] == 1, lock == true, so allowed == false.
_hidl_cb(OemLockStatus::OK, lock_byte != 0 ? false : true);
return Void();
}
} // namespace esed
} // namespace android
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