-
Notifications
You must be signed in to change notification settings - Fork 84
/
loader.go
298 lines (249 loc) · 9.14 KB
/
loader.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
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
package credloader
import (
"context"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/json"
"encoding/pem"
"sync"
"time"
"github.com/kyma-incubator/compass/components/director/pkg/cert"
"github.com/kyma-incubator/compass/components/director/pkg/kubernetes"
"github.com/kyma-incubator/compass/components/director/pkg/namespacedname"
"github.com/pkg/errors"
"github.com/kyma-incubator/compass/components/director/pkg/log"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/watch"
)
const certsListLoaderCorrelationID = "creds-loader-id"
// CredentialType determines if the loader is for Keys or for Certificates
type CredentialType string
const (
// KeysCredential is a constant for Keys
KeysCredential CredentialType = "KeysCredentials"
// CertificateCredential is a constant for Certificates
CertificateCredential CredentialType = "CertificateCredentials"
)
// Loader provide mechanism to load credential data into in-memory storage
type Loader interface {
Run(ctx context.Context)
}
// Manager is a kubernetes secret manager that has methods to work with secret resources
//
//go:generate mockery --name=Manager --output=automock --outpkg=automock --case=underscore --disable-version-string
type Manager interface {
Watch(ctx context.Context, opts metav1.ListOptions) (watch.Interface, error)
}
type loader struct {
config CertConfig
keysConfig KeysConfig
certCache *certificateCache
keyCache *KeyCache
secretManagers map[string]Manager
secretNamesTypes map[string]CredentialType
reconnectInterval time.Duration
}
// NewCertificateLoader creates new certificate loader which is responsible to watch a secret containing client certificate
// and update in-memory cache with that certificate if there is any change
func NewCertificateLoader(config CertConfig, certCache *certificateCache, secretManagers map[string]Manager, secretNames map[string]CredentialType, reconnectInterval time.Duration) Loader {
return &loader{
config: config,
certCache: certCache,
secretManagers: secretManagers,
secretNamesTypes: secretNames,
reconnectInterval: reconnectInterval,
}
}
// NewKeyLoader creates new certificate loader which is responsible to watch a secret containing public/private keys
// and update in-memory cache with that keys if there is any change
func NewKeyLoader(keysConfig KeysConfig, keysCache *KeyCache, secretManagers map[string]Manager, secretNames map[string]CredentialType, reconnectInterval time.Duration) Loader {
return &loader{
keysConfig: keysConfig,
keyCache: keysCache,
secretManagers: secretManagers,
secretNamesTypes: secretNames,
reconnectInterval: reconnectInterval,
}
}
// StartCertLoader prepares and run certificate loader goroutine
func StartCertLoader(ctx context.Context, certLoaderConfig CertConfig) (CertCache, error) {
parsedCertSecret, err := namespacedname.Parse(certLoaderConfig.ExternalClientCertSecret)
if err != nil {
return nil, err
}
kubeConfig := kubernetes.Config{}
k8sClientSet, err := kubernetes.NewKubernetesClientSet(ctx, kubeConfig.PollInterval, kubeConfig.PollTimeout, kubeConfig.Timeout)
if err != nil {
return nil, err
}
certCache := NewCertificateCache()
secretManagers := map[string]Manager{
parsedCertSecret.Name: k8sClientSet.CoreV1().Secrets(parsedCertSecret.Namespace),
}
secretNames := map[string]CredentialType{
parsedCertSecret.Name: CertificateCredential,
}
certLoader := NewCertificateLoader(certLoaderConfig, certCache, secretManagers, secretNames, time.Second)
go certLoader.Run(ctx)
return certCache, nil
}
// StartKeyLoader prepares and run keys loader goroutine
func StartKeyLoader(ctx context.Context, keysLoaderConfig KeysConfig) (KeysCache, error) {
parsedKeysSecret, err := namespacedname.Parse(keysLoaderConfig.KeysSecret)
if err != nil {
return nil, err
}
kubeConfig := kubernetes.Config{}
k8sClientSet, err := kubernetes.NewKubernetesClientSet(ctx, kubeConfig.PollInterval, kubeConfig.PollTimeout, kubeConfig.Timeout)
if err != nil {
return nil, err
}
keysCache := NewKeyCache()
secretManagers := map[string]Manager{
parsedKeysSecret.Name: k8sClientSet.CoreV1().Secrets(parsedKeysSecret.Namespace),
}
secretNames := map[string]CredentialType{
parsedKeysSecret.Name: KeysCredential,
}
keyLoader := NewKeyLoader(keysLoaderConfig, keysCache, secretManagers, secretNames, time.Second)
go keyLoader.Run(ctx)
return keysCache, nil
}
// Run uses kubernetes watch mechanism to listen for resource changes and update credential cache
func (cl *loader) Run(ctx context.Context) {
entry := log.C(ctx)
entry = entry.WithField(log.FieldRequestID, certsListLoaderCorrelationID)
ctx = log.ContextWithLogger(ctx, entry)
cl.startKubeWatch(ctx)
}
func (cl *loader) startKubeWatch(ctx context.Context) {
for {
select {
case <-ctx.Done():
log.C(ctx).Info("Context cancelled, stopping watcher...")
return
default:
}
log.C(ctx).Info("Starting watchers for secret changes...")
wg := &sync.WaitGroup{}
for name, manager := range cl.secretManagers {
wg.Add(1)
go func(manager Manager, name string) {
defer wg.Done()
watcher, err := manager.Watch(ctx, metav1.ListOptions{
FieldSelector: "metadata.name=" + name,
Watch: true,
})
if err != nil {
log.C(ctx).WithError(err).Errorf("Could not initialize watcher for resource name %q. Sleep for %s and try again... %v", name, cl.reconnectInterval.String(), err)
time.Sleep(cl.reconnectInterval)
return
}
log.C(ctx).Infof("Waiting for secret %s events...", name)
CredentialType := cl.secretNamesTypes[name]
cl.processEvents(ctx, watcher.ResultChan(), name, CredentialType)
// Cleanup any allocated resources
watcher.Stop()
time.Sleep(cl.reconnectInterval)
}(manager, name)
}
wg.Wait()
}
}
func (cl *loader) processEvents(ctx context.Context, events <-chan watch.Event, secretName string, credentialType CredentialType) {
for {
select {
case <-ctx.Done():
return
case ev, ok := <-events:
if !ok {
return
}
switch ev.Type {
case watch.Added:
fallthrough
case watch.Modified:
log.C(ctx).Infof("Updating the cache with %s data...", credentialType)
secret, ok := ev.Object.(*v1.Secret)
if !ok {
log.C(ctx).Error("Unexpected error: object is not secret. Try again")
continue
}
if credentialType == CertificateCredential {
tlsCert, err := ParseCertificate(ctx, secret.Data, cl.config)
if err != nil {
log.C(ctx).WithError(err).Error("Fail during certificate parsing")
}
cl.certCache.put(secretName, tlsCert)
} else {
keys, err := ParseKeys(ctx, secret.Data, cl.keysConfig)
if err != nil {
log.C(ctx).WithError(err).Error("Fail during keys parsing")
}
cl.keyCache.put(secretName, keys)
}
case watch.Deleted:
log.C(ctx).Infof("Removing %s secret data from cache...", credentialType)
if credentialType == CertificateCredential {
cl.certCache.put(secretName, nil)
} else {
cl.keyCache.put(secretName, nil)
}
case watch.Error:
log.C(ctx).Errorf("Error event is received, stop %s secret watcher and try again...", credentialType)
return
}
}
}
}
// ParseCertificate parses a certificate by secret data map
func ParseCertificate(ctx context.Context, secretData map[string][]byte, config CertConfig) (*tls.Certificate, error) {
log.C(ctx).Info("Parsing provided certificate data...")
certChainBytes, existsCertKey := secretData[config.ExternalClientCertCertKey]
privateKeyBytes, existsKeyKey := secretData[config.ExternalClientCertKeyKey]
if existsCertKey && existsKeyKey {
return cert.ParseCertificateBytes(certChainBytes, privateKeyBytes)
}
return nil, errors.New("There is no certificate data provided")
}
// ParseKeys parses keys by secret data map
func ParseKeys(ctx context.Context, secretData map[string][]byte, config KeysConfig) (*KeyStore, error) {
log.C(ctx).Info("Parsing provided keys data...")
dataBytes, exists := secretData[config.KeysData]
if exists {
return parseKeysBytes(dataBytes)
}
return nil, errors.New("There is no public/private key data provided")
}
func parseKeysBytes(dataBytes []byte) (*KeyStore, error) {
data := &secretData{}
if err := json.Unmarshal(dataBytes, data); err != nil {
return nil, errors.Wrapf(err, "while unmarashalling secret data")
}
privateKeyBlock, _ := pem.Decode([]byte(data.PrivateKey))
if privateKeyBlock == nil {
return nil, errors.New("Error while decoding private key")
}
rsaPrivateKey, err := x509.ParsePKCS8PrivateKey(privateKeyBlock.Bytes)
if err != nil {
return nil, errors.Wrap(err, "while parsing private key block")
}
publicKeyBlock, _ := pem.Decode([]byte(data.PublicKey))
if publicKeyBlock == nil {
return nil, errors.New("Error while decoding public key")
}
genericPublicKey, err := x509.ParsePKIXPublicKey(publicKeyBlock.Bytes)
if err != nil {
return nil, errors.Wrap(err, "while parsing private key block")
}
rsaPublicKey, ok := genericPublicKey.(*rsa.PublicKey)
if !ok {
return nil, errors.New("error while casting public key")
}
return &KeyStore{
PublicKey: rsaPublicKey,
PrivateKey: rsaPrivateKey,
}, nil
}