-
Notifications
You must be signed in to change notification settings - Fork 0
/
fs.go
173 lines (153 loc) · 3.04 KB
/
fs.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
package generic
import (
"errors"
"io"
"os"
"path/filepath"
)
// Secure way to delete file
func Delete(targetPath string, cycle int) error {
if cycle == 0 {
cycle = 3
}
// #do-not-check-gosec
file, err := os.OpenFile(targetPath, os.O_RDWR, 0o666)
if err != nil {
return err
}
defer file.Close()
fileInfo, err := file.Stat()
if err != nil {
return err
}
zeroBytes := make([]byte, fileInfo.Size())
for i := 0; i < cycle; i++ {
// Owerwrite with zeros
n, err := WriteAndFlush(file, zeroBytes)
if err != nil {
return err
}
if n != int(fileInfo.Size()) {
return errors.New("owerwrite bytes mismatch")
}
// Owerwrites with random
rnd, err := CSPRNG(fileInfo.Size())
if err != nil {
return err
}
n, err = WriteAndFlush(file, rnd)
if err != nil {
return err
}
if n != int(fileInfo.Size()) {
return errors.New("rand owerwrite bytes mismatch")
}
}
err = os.Remove(targetPath)
if err != nil {
return err
}
return nil
}
// Secure way to overwrite file
func Overwrite(targetPath string, data []byte, cycle int) error {
if cycle == 0 {
cycle = 3
}
// #do-not-check-gosec
file, err := os.OpenFile(targetPath, os.O_RDWR, 0o666)
if err != nil {
return err
}
defer file.Close()
fileInfo, err := file.Stat()
if err != nil {
return err
}
if len(data) != int(fileInfo.Size()) {
return errors.New("data size must be equal to file size")
}
zeroBytes := make([]byte, fileInfo.Size())
for i := 0; i < cycle; i++ {
// Owerwrite with zeros
n, err := WriteAndFlush(file, zeroBytes)
if err != nil {
return err
}
if n != int(fileInfo.Size()) {
return errors.New("owerwrite bytes mismatch")
}
// Owerwrites with random
rnd, err := CSPRNG(fileInfo.Size())
if err != nil {
return err
}
n, err = WriteAndFlush(file, rnd)
if err != nil {
return err
}
if n != int(fileInfo.Size()) {
return errors.New("rand owerwrite bytes mismatch")
}
}
n, err := file.Write(data)
if err != nil {
return err
}
err = file.Sync()
if err != nil {
return err
}
if n != len(data) {
return errors.New("file overwrite bytes mismatch")
}
return nil
}
func FileWalkByName(startPath, name string) ([]string, error) {
var paths []string
err := filepath.Walk(startPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
return nil
}
if !info.IsDir() && info.Name() == name {
paths = append(paths, path)
}
return nil
})
if err != nil {
return []string{}, nil
}
return paths, nil
}
func ReadFileContent(path string) ([]byte, error) {
// #do-not-check-gosec
j, err := os.Open(path)
if err != nil {
return []byte{}, err
}
defer j.Close()
data, err := io.ReadAll(j)
if err != nil {
return []byte{}, err
}
return data, nil
}
func WriteAndFlush(file *os.File, rnd []byte) (n int, err error) {
n, err = file.Write(rnd)
if err != nil {
return 0, err
}
err = file.Sync()
if err != nil {
return 0, err
}
err = file.Truncate(0)
if err != nil {
return 0, err
}
_, err = file.Seek(0, 0)
if err != nil {
return 0, err
}
return n, nil
}