1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "install/wipe_data.h"
18
19 #include <stdio.h>
20 #include <string.h>
21 #include <sys/stat.h>
22
23 #include <functional>
24 #include <vector>
25
26 #include <android-base/file.h>
27 #include <android-base/logging.h>
28 #include <android-base/stringprintf.h>
29
30 #include "otautil/dirutil.h"
31 #include "otautil/logging.h"
32 #include "otautil/roots.h"
33 #include "recovery_ui/ui.h"
34
35 constexpr const char* CACHE_ROOT = "/cache";
36 constexpr const char* DATA_ROOT = "/data";
37 constexpr const char* METADATA_ROOT = "/metadata";
38
EraseVolume(const char * volume,RecoveryUI * ui,bool convert_fbe)39 static bool EraseVolume(const char* volume, RecoveryUI* ui, bool convert_fbe) {
40 bool is_cache = (strcmp(volume, CACHE_ROOT) == 0);
41 bool is_data = (strcmp(volume, DATA_ROOT) == 0);
42
43 ui->SetBackground(RecoveryUI::ERASING);
44 ui->SetProgressType(RecoveryUI::INDETERMINATE);
45
46 std::vector<saved_log_file> log_files;
47 if (is_cache) {
48 // If we're reformatting /cache, we load any past logs (i.e. "/cache/recovery/last_*") and the
49 // current log ("/cache/recovery/log") into memory, so we can restore them after the reformat.
50 log_files = ReadLogFilesToMemory();
51 }
52
53 ui->Print("Formatting %s...\n", volume);
54
55 ensure_path_unmounted(volume);
56
57 int result;
58 if (is_data && convert_fbe) {
59 constexpr const char* CONVERT_FBE_DIR = "/tmp/convert_fbe";
60 constexpr const char* CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe";
61 // Create convert_fbe breadcrumb file to signal init to convert to file based encryption, not
62 // full disk encryption.
63 if (mkdir(CONVERT_FBE_DIR, 0700) != 0) {
64 PLOG(ERROR) << "Failed to mkdir " << CONVERT_FBE_DIR;
65 return false;
66 }
67 FILE* f = fopen(CONVERT_FBE_FILE, "wbe");
68 if (!f) {
69 PLOG(ERROR) << "Failed to convert to file encryption";
70 return false;
71 }
72 fclose(f);
73 result = format_volume(volume, CONVERT_FBE_DIR);
74 remove(CONVERT_FBE_FILE);
75 rmdir(CONVERT_FBE_DIR);
76 } else {
77 result = format_volume(volume);
78 }
79
80 if (is_cache) {
81 RestoreLogFilesAfterFormat(log_files);
82 }
83
84 return (result == 0);
85 }
86
WipeCache(RecoveryUI * ui,const std::function<bool ()> & confirm_func)87 bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) {
88 bool has_cache = volume_for_mount_point("/cache") != nullptr;
89 if (!has_cache) {
90 ui->Print("No /cache partition found.\n");
91 return false;
92 }
93
94 if (confirm_func && !confirm_func()) {
95 return false;
96 }
97
98 ui->Print("\n-- Wiping cache...\n");
99 bool success = EraseVolume("/cache", ui, false);
100 ui->Print("Cache wipe %s.\n", success ? "complete" : "failed");
101 return success;
102 }
103
WipeData(Device * device,bool convert_fbe)104 bool WipeData(Device* device, bool convert_fbe) {
105 RecoveryUI* ui = device->GetUI();
106 ui->Print("\n-- Wiping data...\n");
107 bool success = device->PreWipeData();
108 if (success) {
109 success &= EraseVolume(DATA_ROOT, ui, convert_fbe);
110 bool has_cache = volume_for_mount_point("/cache") != nullptr;
111 if (has_cache) {
112 success &= EraseVolume(CACHE_ROOT, ui, false);
113 }
114 if (volume_for_mount_point(METADATA_ROOT) != nullptr) {
115 success &= EraseVolume(METADATA_ROOT, ui, false);
116 }
117 }
118 if (success) {
119 success &= device->PostWipeData();
120 }
121 ui->Print("Data wipe %s.\n", success ? "complete" : "failed");
122 return success;
123 }