/
lock.go
153 lines (137 loc) · 2.92 KB
/
lock.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
package main
import (
"archive/tar"
"bytes"
"compress/gzip"
"context"
"flag"
"fmt"
"io/ioutil"
"os"
"syscall"
"unicode"
"github.com/google/subcommands"
"golang.org/x/term"
)
type lockCmd struct {
outname string
}
func (*lockCmd) Name() string { return "lock" }
func (*lockCmd) Synopsis() string { return "lock files or directories" }
func (*lockCmd) Usage() string {
return `lock [OPTS] FILES:
Archive and encrypt files or directories.
`
}
func (p *lockCmd) SetFlags(f *flag.FlagSet) {
f.StringVar(&p.outname, "o", "", "output crypt file name")
}
func (p *lockCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
pw, err := getpasswd()
if err != nil {
fmt.Fprintln(os.Stderr, err)
return subcommands.ExitFailure
}
if p.outname == "" {
if len(f.Args()) == 1 && f.Args()[0] != "" && isword(f.Args()[0][0]) {
p.outname = f.Args()[0] + ".crypt"
} else {
p.outname = "archive.crypt"
}
}
err = lock(p.outname, pw, f.Args()...)
if err != nil {
fmt.Fprintln(os.Stderr, err)
return subcommands.ExitFailure
}
return subcommands.ExitSuccess
}
func lockFrom(outname string, pw []byte, hdr *tar.Header, data []byte) error {
buf := &bytes.Buffer{}
zw := gzip.NewWriter(buf)
tw := tar.NewWriter(zw)
err := archiveBytes(data, hdr, tw)
if err != nil {
return err
}
tw.Close()
zw.Close()
ldata, err := Encrypt(pw, buf.Bytes())
if err != nil {
return err
}
return ioutil.WriteFile(outname, ldata, 0666)
}
func lock(outname string, pw []byte, files ...string) error {
buf := &bytes.Buffer{}
zw := gzip.NewWriter(buf)
tw := tar.NewWriter(zw)
for _, arg := range files {
err := archive("", arg, tw)
if err != nil {
return err
}
}
tw.Close()
zw.Close()
ldata, err := Encrypt(pw, buf.Bytes())
if err != nil {
return err
}
return ioutil.WriteFile(outname, ldata, 0666)
}
func archiveBytes(data []byte, hdr *tar.Header, tw *tar.Writer) error {
// TODO: link target
hdr.Size = int64(len(data))
err := tw.WriteHeader(hdr)
if err != nil {
return err
}
_, err = tw.Write(data)
return err
}
func archive(base, path string, tw *tar.Writer) error {
fi, err := os.Stat(path)
if err != nil {
return err
}
// TODO: link target
hdr, err := tar.FileInfoHeader(fi, "")
if err != nil {
return err
}
hdr.Name = base + "/" + fi.Name()
err = tw.WriteHeader(hdr)
if err != nil {
return err
}
if fi.IsDir() {
ents, err := os.ReadDir(path)
if err != nil {
return err
}
for _, ent := range ents {
e := archive(base+"/"+fi.Name(), path+"/"+ent.Name(), tw)
if e != nil {
err = e
}
}
return err
}
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
_, err = tw.Write(data)
return err
}
func getpasswd() ([]byte, error) {
fmt.Print("password:")
pw, err := term.ReadPassword(int(syscall.Stdin))
fmt.Println()
return pw, err
}
func isword(b byte) bool {
r := rune(b)
return unicode.IsLetter(r) || unicode.IsNumber(r)
}