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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 "install/wipe_data.h"
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <functional>
#include <memory>
#include <vector>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include "otautil/dirutil.h"
#include "otautil/logging.h"
#include "otautil/roots.h"
#include "recovery_ui/ui.h"
constexpr const char* CACHE_ROOT = "/cache";
constexpr const char* DATA_ROOT = "/data";
constexpr const char* METADATA_ROOT = "/metadata";
constexpr const char* CACHE_LOG_DIR = "/cache/recovery";
static struct selabel_handle* sehandle;
void SetWipeDataSehandle(selabel_handle* handle) {
sehandle = handle;
}
struct saved_log_file {
std::string name;
struct stat sb;
std::string data;
};
static bool EraseVolume(const char* volume, RecoveryUI* ui, bool convert_fbe) {
bool is_cache = (strcmp(volume, CACHE_ROOT) == 0);
bool is_data = (strcmp(volume, DATA_ROOT) == 0);
ui->SetBackground(RecoveryUI::ERASING);
ui->SetProgressType(RecoveryUI::INDETERMINATE);
std::vector<saved_log_file> log_files;
if (is_cache) {
// If we're reformatting /cache, we load any past logs
// (i.e. "/cache/recovery/last_*") and the current log
// ("/cache/recovery/log") into memory, so we can restore them after
// the reformat.
ensure_path_mounted(volume);
struct dirent* de;
std::unique_ptr<DIR, decltype(&closedir)> d(opendir(CACHE_LOG_DIR), closedir);
if (d) {
while ((de = readdir(d.get())) != nullptr) {
if (strncmp(de->d_name, "last_", 5) == 0 || strcmp(de->d_name, "log") == 0) {
std::string path = android::base::StringPrintf("%s/%s", CACHE_LOG_DIR, de->d_name);
struct stat sb;
if (stat(path.c_str(), &sb) == 0) {
// truncate files to 512kb
if (sb.st_size > (1 << 19)) {
sb.st_size = 1 << 19;
}
std::string data(sb.st_size, '\0');
FILE* f = fopen(path.c_str(), "rbe");
fread(&data[0], 1, data.size(), f);
fclose(f);
log_files.emplace_back(saved_log_file{ path, sb, data });
}
}
}
} else {
if (errno != ENOENT) {
PLOG(ERROR) << "Failed to opendir " << CACHE_LOG_DIR;
}
}
}
ui->Print("Formatting %s...\n", volume);
ensure_path_unmounted(volume);
int result;
if (is_data && convert_fbe) {
constexpr const char* CONVERT_FBE_DIR = "/tmp/convert_fbe";
constexpr const char* CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe";
// Create convert_fbe breadcrumb file to signal init to convert to file based encryption, not
// full disk encryption.
if (mkdir(CONVERT_FBE_DIR, 0700) != 0) {
PLOG(ERROR) << "Failed to mkdir " << CONVERT_FBE_DIR;
return false;
}
FILE* f = fopen(CONVERT_FBE_FILE, "wbe");
if (!f) {
PLOG(ERROR) << "Failed to convert to file encryption";
return false;
}
fclose(f);
result = format_volume(volume, CONVERT_FBE_DIR);
remove(CONVERT_FBE_FILE);
rmdir(CONVERT_FBE_DIR);
} else {
result = format_volume(volume);
}
if (is_cache) {
// Re-create the log dir and write back the log entries.
if (ensure_path_mounted(CACHE_LOG_DIR) == 0 &&
mkdir_recursively(CACHE_LOG_DIR, 0777, false, sehandle) == 0) {
for (const auto& log : log_files) {
if (!android::base::WriteStringToFile(log.data, log.name, log.sb.st_mode, log.sb.st_uid,
log.sb.st_gid)) {
PLOG(ERROR) << "Failed to write to " << log.name;
}
}
} else {
PLOG(ERROR) << "Failed to mount / create " << CACHE_LOG_DIR;
}
// Any part of the log we'd copied to cache is now gone.
// Reset the pointer so we copy from the beginning of the temp
// log.
reset_tmplog_offset();
copy_logs(true /* save_current_log */, true /* has_cache */, sehandle);
}
return (result == 0);
}
bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) {
bool has_cache = volume_for_mount_point("/cache") != nullptr;
if (!has_cache) {
ui->Print("No /cache partition found.\n");
return false;
}
if (confirm_func && !confirm_func()) {
return false;
}
ui->Print("\n-- Wiping cache...\n");
bool success = EraseVolume("/cache", ui, false);
ui->Print("Cache wipe %s.\n", success ? "complete" : "failed");
return success;
}
bool WipeData(Device* device, bool convert_fbe) {
RecoveryUI* ui = device->GetUI();
ui->Print("\n-- Wiping data...\n");
bool success = device->PreWipeData();
if (success) {
success &= EraseVolume(DATA_ROOT, ui, convert_fbe);
bool has_cache = volume_for_mount_point("/cache") != nullptr;
if (has_cache) {
success &= EraseVolume(CACHE_ROOT, ui, false);
}
if (volume_for_mount_point(METADATA_ROOT) != nullptr) {
success &= EraseVolume(METADATA_ROOT, ui, false);
}
}
if (success) {
success &= device->PostWipeData();
}
ui->Print("Data wipe %s.\n", success ? "complete" : "failed");
return success;
}
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