forked from argoproj/argo-cd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
clusterauth.go
322 lines (298 loc) · 10.3 KB
/
clusterauth.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
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
package clusterauth
import (
"fmt"
"strings"
"time"
jwt "github.com/dgrijalva/jwt-go"
log "github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
apierr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
)
// ArgoCDManagerServiceAccount is the name of the service account for managing a cluster
const (
ArgoCDManagerServiceAccount = "argocd-manager"
ArgoCDManagerClusterRole = "argocd-manager-role"
ArgoCDManagerClusterRoleBinding = "argocd-manager-role-binding"
)
// ArgoCDManagerPolicyRules are the policies to give argocd-manager
var ArgoCDManagerPolicyRules = []rbacv1.PolicyRule{
{
APIGroups: []string{"*"},
Resources: []string{"*"},
Verbs: []string{"*"},
},
{
NonResourceURLs: []string{"*"},
Verbs: []string{"*"},
},
}
// CreateServiceAccount creates a service account in a given namespace
func CreateServiceAccount(
clientset kubernetes.Interface,
serviceAccountName string,
namespace string,
) error {
serviceAccount := corev1.ServiceAccount{
TypeMeta: metav1.TypeMeta{
APIVersion: "v1",
Kind: "ServiceAccount",
},
ObjectMeta: metav1.ObjectMeta{
Name: serviceAccountName,
Namespace: namespace,
},
}
_, err := clientset.CoreV1().ServiceAccounts(namespace).Create(&serviceAccount)
if err != nil {
if !apierr.IsAlreadyExists(err) {
return fmt.Errorf("Failed to create service account %q in namespace %q: %v", serviceAccountName, namespace, err)
}
log.Infof("ServiceAccount %q already exists in namespace %q", serviceAccountName, namespace)
return nil
}
log.Infof("ServiceAccount %q created in namespace %q", serviceAccountName, namespace)
return nil
}
// CreateClusterRole creates a cluster role
func CreateClusterRole(
clientset kubernetes.Interface,
clusterRoleName string,
rules []rbacv1.PolicyRule,
) error {
clusterRole := rbacv1.ClusterRole{
TypeMeta: metav1.TypeMeta{
APIVersion: "rbac.authorization.k8s.io/v1",
Kind: "ClusterRole",
},
ObjectMeta: metav1.ObjectMeta{
Name: clusterRoleName,
},
Rules: rules,
}
crclient := clientset.RbacV1().ClusterRoles()
_, err := crclient.Create(&clusterRole)
if err != nil {
if !apierr.IsAlreadyExists(err) {
return fmt.Errorf("Failed to create ClusterRole %q: %v", clusterRoleName, err)
}
_, err = crclient.Update(&clusterRole)
if err != nil {
return fmt.Errorf("Failed to update ClusterRole %q: %v", clusterRoleName, err)
}
log.Infof("ClusterRole %q updated", clusterRoleName)
} else {
log.Infof("ClusterRole %q created", clusterRoleName)
}
return nil
}
// CreateClusterRoleBinding create a ClusterRoleBinding
func CreateClusterRoleBinding(
clientset kubernetes.Interface,
clusterBindingRoleName,
serviceAccountName,
clusterRoleName string,
namespace string,
) error {
roleBinding := rbacv1.ClusterRoleBinding{
TypeMeta: metav1.TypeMeta{
APIVersion: "rbac.authorization.k8s.io/v1",
Kind: "ClusterRoleBinding",
},
ObjectMeta: metav1.ObjectMeta{
Name: clusterBindingRoleName,
},
RoleRef: rbacv1.RoleRef{
APIGroup: "rbac.authorization.k8s.io",
Kind: "ClusterRole",
Name: clusterRoleName,
},
Subjects: []rbacv1.Subject{
{
Kind: rbacv1.ServiceAccountKind,
Name: serviceAccountName,
Namespace: namespace,
},
},
}
_, err := clientset.RbacV1().ClusterRoleBindings().Create(&roleBinding)
if err != nil {
if !apierr.IsAlreadyExists(err) {
return fmt.Errorf("Failed to create ClusterRoleBinding %s: %v", clusterBindingRoleName, err)
}
log.Infof("ClusterRoleBinding %q already exists", clusterBindingRoleName)
return nil
}
log.Infof("ClusterRoleBinding %q created, bound %q to %q", clusterBindingRoleName, serviceAccountName, clusterRoleName)
return nil
}
// InstallClusterManagerRBAC installs RBAC resources for a cluster manager to operate a cluster. Returns a token
func InstallClusterManagerRBAC(clientset kubernetes.Interface, ns string) (string, error) {
err := CreateServiceAccount(clientset, ArgoCDManagerServiceAccount, ns)
if err != nil {
return "", err
}
err = CreateClusterRole(clientset, ArgoCDManagerClusterRole, ArgoCDManagerPolicyRules)
if err != nil {
return "", err
}
err = CreateClusterRoleBinding(clientset, ArgoCDManagerClusterRoleBinding, ArgoCDManagerServiceAccount, ArgoCDManagerClusterRole, ns)
if err != nil {
return "", err
}
var serviceAccount *corev1.ServiceAccount
var secretName string
err = wait.Poll(500*time.Millisecond, 30*time.Second, func() (bool, error) {
serviceAccount, err = clientset.CoreV1().ServiceAccounts(ns).Get(ArgoCDManagerServiceAccount, metav1.GetOptions{})
if err != nil {
return false, err
}
if len(serviceAccount.Secrets) == 0 {
return false, nil
}
secretName = serviceAccount.Secrets[0].Name
return true, nil
})
if err != nil {
return "", fmt.Errorf("Failed to wait for service account secret: %v", err)
}
secret, err := clientset.CoreV1().Secrets(ns).Get(secretName, metav1.GetOptions{})
if err != nil {
return "", fmt.Errorf("Failed to retrieve secret %q: %v", secretName, err)
}
token, ok := secret.Data["token"]
if !ok {
return "", fmt.Errorf("Secret %q for service account %q did not have a token", secretName, serviceAccount)
}
return string(token), nil
}
// UninstallClusterManagerRBAC removes RBAC resources for a cluster manager to operate a cluster
func UninstallClusterManagerRBAC(clientset kubernetes.Interface) error {
return UninstallRBAC(clientset, "kube-system", ArgoCDManagerClusterRoleBinding, ArgoCDManagerClusterRole, ArgoCDManagerServiceAccount)
}
// UninstallRBAC uninstalls RBAC related resources for a binding, role, and service account
func UninstallRBAC(clientset kubernetes.Interface, namespace, bindingName, roleName, serviceAccount string) error {
if err := clientset.RbacV1().ClusterRoleBindings().Delete(bindingName, &metav1.DeleteOptions{}); err != nil {
if !apierr.IsNotFound(err) {
return fmt.Errorf("Failed to delete ClusterRoleBinding: %v", err)
}
log.Infof("ClusterRoleBinding %q not found", bindingName)
} else {
log.Infof("ClusterRoleBinding %q deleted", bindingName)
}
if err := clientset.RbacV1().ClusterRoles().Delete(roleName, &metav1.DeleteOptions{}); err != nil {
if !apierr.IsNotFound(err) {
return fmt.Errorf("Failed to delete ClusterRole: %v", err)
}
log.Infof("ClusterRole %q not found", roleName)
} else {
log.Infof("ClusterRole %q deleted", roleName)
}
if err := clientset.CoreV1().ServiceAccounts(namespace).Delete(serviceAccount, &metav1.DeleteOptions{}); err != nil {
if !apierr.IsNotFound(err) {
return fmt.Errorf("Failed to delete ServiceAccount: %v", err)
}
log.Infof("ServiceAccount %q in namespace %q not found", serviceAccount, namespace)
} else {
log.Infof("ServiceAccount %q deleted", serviceAccount)
}
return nil
}
type ServiceAccountClaims struct {
Sub string `json:"sub"`
Iss string `json:"iss"`
Namespace string `json:"kubernetes.io/serviceaccount/namespace"`
SecretName string `json:"kubernetes.io/serviceaccount/secret.name"`
ServiceAccountName string `json:"kubernetes.io/serviceaccount/service-account.name"`
ServiceAccountUID string `json:"kubernetes.io/serviceaccount/service-account.uid"`
}
// Valid satisfies the jwt.Claims interface to enable JWT parsing
func (sac *ServiceAccountClaims) Valid() error {
return nil
}
// ParseServiceAccountToken parses a Kubernetes service account token
func ParseServiceAccountToken(token string) (*ServiceAccountClaims, error) {
parser := &jwt.Parser{
SkipClaimsValidation: true,
}
var claims ServiceAccountClaims
_, _, err := parser.ParseUnverified(token, &claims)
if err != nil {
return nil, fmt.Errorf("Failed to parse service account token: %s", err)
}
return &claims, nil
}
// GenerateNewClusterManagerSecret creates a new secret derived with same metadata as existing one
// and waits until the secret is populated with a bearer token
func GenerateNewClusterManagerSecret(clientset kubernetes.Interface, claims *ServiceAccountClaims) (*corev1.Secret, error) {
secretsClient := clientset.CoreV1().Secrets(claims.Namespace)
existingSecret, err := secretsClient.Get(claims.SecretName, metav1.GetOptions{})
if err != nil {
return nil, err
}
var newSecret corev1.Secret
secretNameSplit := strings.Split(claims.SecretName, "-")
if len(secretNameSplit) > 0 {
secretNameSplit = secretNameSplit[:len(secretNameSplit)-1]
}
newSecret.Type = corev1.SecretTypeServiceAccountToken
newSecret.GenerateName = strings.Join(secretNameSplit, "-") + "-"
newSecret.Annotations = existingSecret.Annotations
// We will create an empty secret and let kubernetes populate the data
newSecret.Data = nil
created, err := secretsClient.Create(&newSecret)
if err != nil {
return nil, err
}
err = wait.Poll(500*time.Millisecond, 30*time.Second, func() (bool, error) {
created, err = secretsClient.Get(created.Name, metav1.GetOptions{})
if err != nil {
return false, err
}
if len(created.Data) == 0 {
return false, nil
}
return true, nil
})
if err != nil {
return nil, fmt.Errorf("Timed out waiting for secret to generate new token")
}
return created, nil
}
// RotateServiceAccountSecrets rotates the entries in the service accounts secrets list
func RotateServiceAccountSecrets(clientset kubernetes.Interface, claims *ServiceAccountClaims, newSecret *corev1.Secret) error {
// 1. update service account secrets list with new secret name while also removing the old name
saClient := clientset.CoreV1().ServiceAccounts(claims.Namespace)
sa, err := saClient.Get(claims.ServiceAccountName, metav1.GetOptions{})
if err != nil {
return err
}
var newSecretsList []corev1.ObjectReference
alreadyPresent := false
for _, objRef := range sa.Secrets {
if objRef.Name == claims.SecretName {
continue
}
if objRef.Name == newSecret.Name {
alreadyPresent = true
}
newSecretsList = append(newSecretsList, objRef)
}
if !alreadyPresent {
sa.Secrets = append(newSecretsList, corev1.ObjectReference{Name: newSecret.Name})
}
_, err = saClient.Update(sa)
if err != nil {
return err
}
// 2. delete existing secret object
secretsClient := clientset.CoreV1().Secrets(claims.Namespace)
err = secretsClient.Delete(claims.SecretName, &metav1.DeleteOptions{})
if !apierr.IsNotFound(err) {
return err
}
return nil
}