forked from bitnami-labs/sealed-secrets
-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
228 lines (187 loc) · 5.56 KB
/
main.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
package main
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
goflag "flag"
"io"
"io/ioutil"
"log"
"math/big"
"os"
"os/signal"
"strings"
"syscall"
"time"
flag "github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/pkg/api"
"k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/rest"
certUtil "k8s.io/client-go/util/cert"
ssv1alpha1 "github.com/bitnami/sealed-secrets/apis/v1alpha1"
)
var (
keyName = flag.String("key-name", "sealed-secrets-key", "Name of Secret containing public/private key.")
keySize = flag.Int("key-size", 4096, "Size of encryption key.")
validFor = flag.Duration("key-ttl", 10*365*24*time.Hour, "Duration that certificate is valid for.")
myCN = flag.String("my-cn", "", "CN to use in generated certificate.")
)
func init() {
// Standard goflags (glog in particular)
flag.CommandLine.AddGoFlagSet(goflag.CommandLine)
if f := flag.CommandLine.Lookup("logtostderr"); f != nil {
f.DefValue = "true"
f.Value.Set(f.DefValue)
}
}
type controller struct {
clientset kubernetes.Interface
}
func readKey(client kubernetes.Interface, namespace, keyName string) (*rsa.PrivateKey, []*x509.Certificate, error) {
secret, err := client.Core().Secrets(namespace).Get(keyName, metav1.GetOptions{})
if err != nil {
return nil, nil, err
}
key, err := certUtil.ParsePrivateKeyPEM(secret.Data[v1.TLSPrivateKeyKey])
if err != nil {
return nil, nil, err
}
certs, err := certUtil.ParseCertsPEM(secret.Data[v1.TLSCertKey])
if err != nil {
return nil, nil, err
}
return key.(*rsa.PrivateKey), certs, nil
}
func writeKey(client kubernetes.Interface, key *rsa.PrivateKey, certs []*x509.Certificate, namespace, keyName string) error {
certbytes := []byte{}
for _, cert := range certs {
certbytes = append(certbytes, certUtil.EncodeCertPEM(cert)...)
}
secret := v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: keyName,
Namespace: namespace,
},
Data: map[string][]byte{
v1.TLSPrivateKeyKey: certUtil.EncodePrivateKeyPEM(key),
v1.TLSCertKey: certbytes,
},
Type: v1.SecretTypeTLS,
}
_, err := client.Core().Secrets(namespace).Create(&secret)
return err
}
func signKey(r io.Reader, key *rsa.PrivateKey) (*x509.Certificate, error) {
// TODO: use certificates API to get this signed by the cluster root CA
// See https://kubernetes.io/docs/tasks/tls/managing-tls-in-a-cluster/
notBefore := time.Now()
serialNo, err := rand.Int(r, new(big.Int).Lsh(big.NewInt(1), 128))
if err != nil {
return nil, err
}
cert := x509.Certificate{
SerialNumber: serialNo,
KeyUsage: x509.KeyUsageEncipherOnly,
NotBefore: notBefore.UTC(),
NotAfter: notBefore.Add(*validFor).UTC(),
Subject: pkix.Name{
CommonName: *myCN,
},
BasicConstraintsValid: true,
IsCA: true,
}
data, err := x509.CreateCertificate(r, &cert, &cert, &key.PublicKey, key)
if err != nil {
return nil, err
}
return x509.ParseCertificate(data)
}
func initKey(client kubernetes.Interface, r io.Reader, keySize int, namespace, keyName string) (*rsa.PrivateKey, []*x509.Certificate, error) {
privKey, certs, err := readKey(client, namespace, keyName)
if err != nil {
if errors.IsNotFound(err) {
log.Printf("Key %s/%s not found, generating new %d bit key", namespace, keyName, keySize)
privKey, err = rsa.GenerateKey(r, keySize)
if err != nil {
return nil, nil, err
}
cert, err := signKey(r, privKey)
if err != nil {
return nil, nil, err
}
certs = []*x509.Certificate{cert}
if err = writeKey(client, privKey, certs, namespace, keyName); err != nil {
return nil, nil, err
}
log.Printf("New key written to %s/%s", namespace, keyName)
} else {
return nil, nil, err
}
}
for _, cert := range certs {
log.Printf("Certificate is:\n%s\n", certUtil.EncodeCertPEM(cert))
}
return privKey, certs, nil
}
func myNamespace() string {
if ns := os.Getenv("POD_NAMESPACE"); ns != "" {
return ns
}
// Fall back to the namespace associated with the service account token, if available
if data, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace"); err == nil {
if ns := strings.TrimSpace(string(data)); len(ns) > 0 {
return ns
}
}
return api.NamespaceDefault
}
func tprClient(c *rest.Config, gv *schema.GroupVersion) (rest.Interface, error) {
tprconfig := *c // shallow copy
tprconfig.GroupVersion = gv
tprconfig.APIPath = "/apis"
tprconfig.ContentType = runtime.ContentTypeJSON
tprconfig.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: api.Codecs}
return rest.RESTClientFor(&tprconfig)
}
func main2() error {
config, err := rest.InClusterConfig()
if err != nil {
return err
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return err
}
ssclient, err := tprClient(config, &ssv1alpha1.SchemeGroupVersion)
if err != nil {
return err
}
myNs := myNamespace()
privKey, certs, err := initKey(clientset, rand.Reader, *keySize, myNs, *keyName)
if err != nil {
return err
}
controller := NewController(clientset, ssclient, privKey)
stop := make(chan struct{})
defer close(stop)
go controller.Run(stop)
go httpserver(func() ([]*x509.Certificate, error) { return certs, nil })
sigterm := make(chan os.Signal, 1)
signal.Notify(sigterm, syscall.SIGTERM)
<-sigterm
return nil
}
func main() {
flag.Parse()
goflag.CommandLine.Parse([]string{})
if err := main2(); err != nil {
panic(err.Error())
}
}