-
Notifications
You must be signed in to change notification settings - Fork 3
/
token.go
171 lines (143 loc) · 3.44 KB
/
token.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
package cmd
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"os"
"path/filepath"
"time"
"github.com/golang-jwt/jwt/v4"
"github.com/spf13/cobra"
)
var privateKeyFile = "token.pem"
var publicKeyFile = "token.pub.pem"
var tokenCmd = &cobra.Command{
Use: "token",
Short: "Create a token to execute a cape function",
RunE: token,
}
func init() {
rootCmd.AddCommand(tokenCmd)
tokenCmd.PersistentFlags().IntP("expires", "e", 3600, "optional time to live (in seconds)")
}
func token(cmd *cobra.Command, args []string) error {
if len(args) < 1 {
return fmt.Errorf("you must pass a function ID")
}
functionID := args[0]
expires, err := cmd.Flags().GetInt("expires")
if err != nil {
return err
}
tokenString, err := Token(functionID, expires)
if err != nil {
return err
}
fmt.Printf("%s\n", tokenString)
return nil
}
func Token(functionID string, expires int) (string, error) {
privateKey, err := getOrGeneratePrivateKey()
if err != nil {
return "", err
}
token := jwt.NewWithClaims(jwt.SigningMethodRS256, jwt.RegisteredClaims{
Subject: functionID,
IssuedAt: &jwt.NumericDate{Time: time.Now()},
ExpiresAt: &jwt.NumericDate{Time: time.Now().Add(time.Second * time.Duration(expires))},
})
tokenString, err := token.SignedString(privateKey)
return tokenString, err
}
func getOrGeneratePrivateKey() (*rsa.PrivateKey, error) {
privateKey, err := getPrivateKey()
if err != nil {
// Attempt to generate a key pair if reading public key fails.
err = generateKeyPair()
if err != nil {
return nil, err
}
privateKey, err = getPrivateKey()
if err != nil {
return nil, err
}
}
return privateKey, err
}
func getPrivateKey() (*rsa.PrivateKey, error) {
keyPEM, err := getPrivateKeyPEM()
if err != nil {
return nil, err
}
block, _ := pem.Decode(keyPEM.Bytes())
if block == nil || block.Type != "RSA PRIVATE KEY" {
return nil, errors.New("failed to decode private key")
}
privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return privateKey, nil
}
func getPrivateKeyPEM() (*bytes.Buffer, error) {
privateKeyPEM, err := os.Open(filepath.Join(C.LocalConfigDir, privateKeyFile))
if err != nil {
return nil, err
}
defer privateKeyPEM.Close()
buf := new(bytes.Buffer)
_, err = buf.ReadFrom(privateKeyPEM)
if err != nil {
return nil, err
}
return buf, nil
}
func generateKeyPair() error {
// Ensure the local auth directory is configured.
err := os.MkdirAll(C.LocalConfigDir, os.ModePerm)
if err != nil {
return err
}
// Generate key pair
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return err
}
publicKey := &privateKey.PublicKey
// Export private key
var privateKeyBytes = x509.MarshalPKCS1PrivateKey(privateKey)
privateKeyBlock := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: privateKeyBytes,
}
privatePem, err := os.Create(filepath.Join(C.LocalConfigDir, privateKeyFile))
if err != nil {
return err
}
err = pem.Encode(privatePem, privateKeyBlock)
if err != nil {
return err
}
// Export public key
publicKeyBytes, err := x509.MarshalPKIXPublicKey(publicKey)
if err != nil {
return err
}
publicKeyBlock := &pem.Block{
Type: "PUBLIC KEY",
Bytes: publicKeyBytes,
}
publicPem, err := os.Create(filepath.Join(C.LocalConfigDir, publicKeyFile))
if err != nil {
return err
}
err = pem.Encode(publicPem, publicKeyBlock)
if err != nil {
return err
}
return nil
}