This repository has been archived by the owner on Nov 1, 2022. It is now read-only.
/
key.go
executable file
·243 lines (221 loc) · 5.07 KB
/
key.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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
// Copyright 2014 gandalf authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package user
import (
"bufio"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"os/user"
"path"
"strings"
"syscall"
"time"
//"code.google.com/p/go.crypto/ssh"
"github.com/gleez/gandalf/config"
"github.com/gleez/gandalf/db"
"github.com/gleez/gandalf/fs"
"golang.org/x/crypto/ssh"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
var (
ErrDuplicateKey = errors.New("Duplicate key")
ErrInvalidKey = errors.New("Invalid key")
ErrKeyNotFound = errors.New("Key not found")
)
type Key struct {
Name string
Body string
Comment string
UserName string
CreatedAt time.Time
}
func newKey(name, user, raw string) (*Key, error) {
key, comment, _, _, err := ssh.ParseAuthorizedKey([]byte(raw))
if err != nil {
return nil, ErrInvalidKey
}
body := ssh.MarshalAuthorizedKey(key.(ssh.PublicKey))
k := Key{
Name: name,
Body: string(body),
Comment: comment,
UserName: user,
CreatedAt: time.Now(),
}
return &k, nil
}
func (k *Key) String() string {
parts := make([]string, 1, 2)
parts[0] = strings.TrimSpace(k.Body)
if k.Comment != "" {
parts = append(parts, k.Comment)
}
return strings.Join(parts, " ")
}
func (k *Key) format() string {
binPath, err := config.GetString("bin-path")
if err != nil {
panic(err)
}
keyFmt := `no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty,command="%s %s" %s` + "\n"
return fmt.Sprintf(keyFmt, binPath, k.UserName, k)
}
func (k *Key) dump(w io.Writer) error {
formatted := k.format()
n, err := fmt.Fprint(w, formatted)
if err != nil {
return err
}
if n != len(formatted) {
return io.ErrShortWrite
}
return nil
}
// authKey returns the file to write user's keys.
func authKey() string {
if path, _ := config.GetString("authorized-keys-path"); path != "" {
return path
}
var home string
if current, err := user.Current(); err == nil {
home = current.HomeDir
} else {
home = os.ExpandEnv("$HOME")
}
return path.Join(home, ".ssh", "authorized_keys")
}
// writeKeys serializes the given key in the authorized_keys file (of the
// current user).
func writeKey(k *Key) error {
file, err := fs.Filesystem().OpenFile(authKey(), os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
defer file.Close()
syscall.Flock(int(file.Fd()), syscall.LOCK_EX)
defer syscall.Flock(int(file.Fd()), syscall.LOCK_UN)
return k.dump(file)
}
// Writes `key` in authorized_keys file (from current user)
// It does not writes in the database, there is no need for that since the key
// object is embedded on the user's document
func addKey(name, body, username string) error {
key, err := newKey(name, username, body)
if err != nil {
return err
}
conn, err := db.Conn()
if err != nil {
return err
}
defer conn.Close()
err = conn.Key().Insert(key)
if err != nil {
if mgo.IsDup(err) {
return ErrDuplicateKey
}
return err
}
return writeKey(key)
//return nil
}
func addKeys(keys map[string]string, username string) error {
for name, k := range keys {
err := addKey(name, k, username)
if err != nil {
return err
}
}
return nil
}
func remove(k *Key) error {
formatted := k.format()
file, err := fs.Filesystem().OpenFile(authKey(), os.O_RDWR|os.O_EXCL, 0644)
if err != nil {
return err
}
defer file.Close()
lines := make([]string, 0, 10)
reader := bufio.NewReader(file)
line, _ := reader.ReadString('\n')
for line != "" {
if line != formatted {
lines = append(lines, line)
}
line, _ = reader.ReadString('\n')
}
file.Truncate(0)
file.Seek(0, 0)
content := strings.Join(lines, "")
n, err := file.WriteString(content)
if err != nil {
return err
}
if n != len(content) {
return io.ErrShortWrite
}
return nil
}
func removeUserKeys(username string) error {
var keys []Key
q := bson.M{"username": username}
conn, err := db.Conn()
if err != nil {
return err
}
defer conn.Close()
err = conn.Key().Find(q).All(&keys)
if err != nil {
return err
}
conn.Key().RemoveAll(q)
for _, k := range keys {
remove(&k)
}
return nil
}
// removes a key from the database and the authorized_keys file.
func removeKey(name, username string) error {
var k Key
conn, err := db.Conn()
if err != nil {
return err
}
defer conn.Close()
err = conn.Key().Find(bson.M{"name": name, "username": username}).One(&k)
if err != nil {
return ErrKeyNotFound
}
conn.Key().Remove(k)
return remove(&k)
//return nil
}
type KeyList []Key
func (keys KeyList) MarshalJSON() ([]byte, error) {
m := make(map[string]string, len(keys))
for _, key := range keys {
m[key.Name] = key.String()
}
return json.Marshal(m)
}
// ListKeys lists all user's keys.
//
// If the user is not found, returns an error
func ListKeys(uName string) (KeyList, error) {
conn, err := db.Conn()
if err != nil {
return nil, err
}
defer conn.Close()
if n, err := conn.User().FindId(uName).Count(); err != nil || n != 1 {
return nil, ErrUserNotFound
}
var keys []Key
err = conn.Key().Find(bson.M{"username": uName}).All(&keys)
return KeyList(keys), err
}