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/*
* Copyright (C) 2019 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 <dlfcn.h>
#include <stdint.h>
#include <string.h>
#include <string>
#include <string_view>
#include <vector>
#include <android-base/endian.h>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <app_nugget.h>
#include <misc_writer/misc_writer.h>
#include <nos/NuggetClient.h>
#include <nos/debug.h>
#include <recovery_ui/device.h>
#include <recovery_ui/screen_ui.h>
namespace android {
namespace hardware {
namespace google {
namespace pixel {
namespace {
/** Wipe user data from Titan M. */
bool WipeTitanM() {
// Connect to Titan M
::nos::NuggetClient client;
client.Open();
if (!client.IsOpen()) {
LOG(ERROR) << "Failed to connect to Titan M";
return false;
}
// Tell it to wipe user data
const uint32_t magicValue = htole32(ERASE_CONFIRMATION);
std::vector<uint8_t> magic(sizeof(magicValue));
memcpy(magic.data(), &magicValue, sizeof(magicValue));
const uint32_t status
= client.CallApp(APP_ID_NUGGET, NUGGET_PARAM_NUKE_FROM_ORBIT, magic, nullptr);
if (status != APP_SUCCESS) {
LOG(ERROR) << "Titan M user data wipe failed: " << ::nos::StatusCodeString(status)
<< " (" << status << ")";
return false;
}
LOG(INFO) << "Titan M wipe successful";
return true;
}
/** Call device-specifc WipeKeys function, if any. */
bool WipeKeysHook(::RecoveryUI *const ui) {
bool *(*WipeKeysFunc)(::RecoveryUI *const);
reinterpret_cast<void *&>(WipeKeysFunc) = dlsym(RTLD_DEFAULT, "WipeKeys");
if (WipeKeysFunc == nullptr) {
LOG(INFO) << "No WipeKeys implementation";
return true;
}
return (*WipeKeysFunc)(ui);
}
// Wipes the provisioned flag as part of data wipe.
bool WipeProvisionedFlag() {
// Must be consistent with the one in init.hardware.rc (10-byte `theme-dark`).
MiscWriter misc_writer(MiscWriterActions::kClearDarkThemeFlag);
if (!misc_writer.PerformAction()) {
LOG(ERROR) << "Failed to clear the dark theme flag";
return false;
}
LOG(INFO) << "Provisioned flag wiped successful";
return true;
}
// Provision Silent OTA(SOTA) flag while reason is "enable-sota"
bool ProvisionSilentOtaFlag(const std::string& reason) {
if (android::base::StartsWith(reason, MiscWriter::kSotaFlag)) {
MiscWriter misc_writer(MiscWriterActions::kSetSotaFlag);
if (!misc_writer.PerformAction()) {
LOG(ERROR) << "Failed to set the silent ota flag";
return false;
}
LOG(INFO) << "Silent ota flag set successful";
}
return true;
}
} // namespace
class PixelDevice : public ::Device {
public:
explicit PixelDevice(::ScreenRecoveryUI* const ui) : ::Device(ui) {}
/** Hook to wipe user data not stored in /data */
bool PostWipeData() override {
// Try to do everything but report a failure if anything wasn't successful
bool totalSuccess = false;
::RecoveryUI* const ui = GetUI();
ui->Print("Wiping Titan M...\n");
uint32_t retries = 5;
while (retries--) {
if (WipeTitanM()) {
totalSuccess = true;
break;
}
}
if (!WipeKeysHook(ui)) {
totalSuccess = false;
}
if (!WipeProvisionedFlag()) {
totalSuccess = false;
}
// Extendable to wipe other components
// Additional behavior along with wiping data
auto reason = GetReason();
CHECK(reason.has_value());
if (!ProvisionSilentOtaFlag(reason.value())) {
totalSuccess = false;
}
return totalSuccess;
}
};
} // namespace pixel
} // namespace google
} // namespace hardware
} // namespace android
Device *make_device() {
return new ::android::hardware::google::pixel::PixelDevice(new ::ScreenRecoveryUI);
}
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