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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 "Weaver.h"
#include <algorithm>
#include <tuple>
#include <android-base/logging.h>
#include <ese/app/weaver.h>
#include "ScopedEseConnection.h"
namespace android {
namespace esed {
// libhidl
using ::android::hardware::Void;
// HAL
using ::android::hardware::weaver::V1_0::WeaverConfig;
using ::android::hardware::weaver::V1_0::WeaverReadResponse;
using ::android::hardware::weaver::V1_0::WeaverReadStatus;
// Methods from ::android::hardware::weaver::V1_0::IWeaver follow.
Return<void> Weaver::getConfig(getConfig_cb _hidl_cb) {
LOG(VERBOSE) << "Running Weaver::getNumSlots";
// Open SE session for applet
ScopedEseConnection ese{mEse};
ese.init();
EseWeaverSession ws;
ese_weaver_session_init(&ws);
EseAppResult res = ese_weaver_session_open(mEse.ese_interface(), &ws);
if (EseAppResultValue(res) == ESE_APP_RESULT_ERROR_OS) {
switch (EseAppResultAppValue(res)) {
case 0x6999: // SW_APPLET_SELECT_FAILED
case 0x6A82: // SW_FILE_NOT_FOUND
// No applet means no Weaver storage. Report no slots to prompt
// fallback to software mode.
_hidl_cb(WeaverStatus::OK, WeaverConfig{0, 0, 0});
return Void();
}
} else if (res != ESE_APP_RESULT_OK) {
// Transient error
_hidl_cb(WeaverStatus::FAILED, WeaverConfig{});
return Void();
}
// Call the applet
uint32_t numSlots;
if (ese_weaver_get_num_slots(&ws, &numSlots) != ESE_APP_RESULT_OK) {
_hidl_cb(WeaverStatus::FAILED, WeaverConfig{});
return Void();
}
// Try and close the session
if (ese_weaver_session_close(&ws) != ESE_APP_RESULT_OK) {
LOG(WARNING) << "Failed to close Weaver session";
}
_hidl_cb(WeaverStatus::OK, WeaverConfig{numSlots, kEseWeaverKeySize, kEseWeaverValueSize});
return Void();
}
Return<WeaverStatus> Weaver::write(uint32_t slotId, const hidl_vec<uint8_t>& key,
const hidl_vec<uint8_t>& value) {
LOG(INFO) << "Running Weaver::write on slot " << slotId;
ScopedEseConnection ese{mEse};
ese.init();
// Validate the key and value sizes
if (key.size() != kEseWeaverKeySize) {
LOG(ERROR) << "Key size must be " << kEseWeaverKeySize << ", not" << key.size() << " bytes";
return WeaverStatus::FAILED;
}
if (value.size() != kEseWeaverValueSize) {
LOG(ERROR) << "Value size must be " << kEseWeaverValueSize << ", not" << value.size()
<< " bytes";
return WeaverStatus::FAILED;
}
// Open SE session for applet
EseWeaverSession ws;
ese_weaver_session_init(&ws);
if (ese_weaver_session_open(mEse.ese_interface(), &ws) != ESE_APP_RESULT_OK) {
return WeaverStatus::FAILED;
}
// Call the applet
if (ese_weaver_write(&ws, slotId, key.data(), value.data()) != ESE_APP_RESULT_OK) {
return WeaverStatus::FAILED;
}
// Try and close the session
if (ese_weaver_session_close(&ws) != ESE_APP_RESULT_OK) {
LOG(WARNING) << "Failed to close Weaver session";
}
return WeaverStatus::OK;
}
Return<void> Weaver::read(uint32_t slotId, const hidl_vec<uint8_t>& key, read_cb _hidl_cb) {
LOG(VERBOSE) << "Running Weaver::read on slot " << slotId;
// Validate the key size
if (key.size() != kEseWeaverKeySize) {
LOG(ERROR) << "Key size must be " << kEseWeaverKeySize << ", not" << key.size() << " bytes";
_hidl_cb(WeaverReadStatus::FAILED, WeaverReadResponse{});
return Void();
}
// Open SE session for applet
ScopedEseConnection ese{mEse};
ese.init();
EseWeaverSession ws;
ese_weaver_session_init(&ws);
if (ese_weaver_session_open(mEse.ese_interface(), &ws) != ESE_APP_RESULT_OK) {
_hidl_cb(WeaverReadStatus::FAILED, WeaverReadResponse{});
return Void();
}
// Call the applet
hidl_vec<uint8_t> value;
value.resize(kEseWeaverValueSize);
uint32_t timeout;
const int res = ese_weaver_read(&ws, slotId, key.data(), value.data(), &timeout);
WeaverReadStatus status;
switch (res) {
case ESE_APP_RESULT_OK:
status = WeaverReadStatus::OK;
timeout = 0;
break;
case ESE_WEAVER_READ_WRONG_KEY:
status = WeaverReadStatus::INCORRECT_KEY;
value.resize(0);
break;
case ESE_WEAVER_READ_TIMEOUT:
status = WeaverReadStatus::THROTTLE;
value.resize(0);
break;
default:
status = WeaverReadStatus::FAILED;
timeout = 0;
value.resize(0);
break;
}
// Try and close the session
if (ese_weaver_session_close(&ws) != ESE_APP_RESULT_OK) {
LOG(WARNING) << "Failed to close Weaver session";
}
_hidl_cb(status, WeaverReadResponse{timeout, value});
return Void();
}
} // namespace esed
} // namespace android
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