forked from kubernetes/kubernetes
-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
authn.go
187 lines (157 loc) · 6.05 KB
/
authn.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
/*
Copyright 2014 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package apiserver
import (
"crypto/rsa"
"k8s.io/kubernetes/pkg/auth/authenticator"
"k8s.io/kubernetes/pkg/auth/authenticator/bearertoken"
"k8s.io/kubernetes/pkg/controller/serviceaccount"
"k8s.io/kubernetes/pkg/storage"
"k8s.io/kubernetes/pkg/util"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/password/passwordfile"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/request/basicauth"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/request/keystone"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/request/union"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/request/x509"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/token/oidc"
"k8s.io/kubernetes/plugin/pkg/auth/authenticator/token/tokenfile"
)
type AuthenticatorConfig struct {
BasicAuthFile string
ClientCAFile string
TokenAuthFile string
OIDCIssuerURL string
OIDCClientID string
OIDCCAFile string
OIDCUsernameClaim string
ServiceAccountKeyFile string
ServiceAccountLookup bool
Storage storage.Interface
KeystoneURL string
}
// NewAuthenticator returns an authenticator.Request or an error
func NewAuthenticator(config AuthenticatorConfig) (authenticator.Request, error) {
var authenticators []authenticator.Request
if len(config.BasicAuthFile) > 0 {
basicAuth, err := newAuthenticatorFromBasicAuthFile(config.BasicAuthFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, basicAuth)
}
if len(config.ClientCAFile) > 0 {
certAuth, err := newAuthenticatorFromClientCAFile(config.ClientCAFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, certAuth)
}
if len(config.TokenAuthFile) > 0 {
tokenAuth, err := newAuthenticatorFromTokenFile(config.TokenAuthFile)
if err != nil {
return nil, err
}
authenticators = append(authenticators, tokenAuth)
}
if len(config.OIDCIssuerURL) > 0 && len(config.OIDCClientID) > 0 {
oidcAuth, err := newAuthenticatorFromOIDCIssuerURL(config.OIDCIssuerURL, config.OIDCClientID, config.OIDCCAFile, config.OIDCUsernameClaim)
if err != nil {
return nil, err
}
authenticators = append(authenticators, oidcAuth)
}
if len(config.ServiceAccountKeyFile) > 0 {
serviceAccountAuth, err := newServiceAccountAuthenticator(config.ServiceAccountKeyFile, config.ServiceAccountLookup, config.Storage)
if err != nil {
return nil, err
}
authenticators = append(authenticators, serviceAccountAuth)
}
if len(config.KeystoneURL) > 0 {
keystoneAuth, err := newAuthenticatorFromKeystoneURL(config.KeystoneURL)
if err != nil {
return nil, err
}
authenticators = append(authenticators, keystoneAuth)
}
switch len(authenticators) {
case 0:
return nil, nil
case 1:
return authenticators[0], nil
default:
return union.New(authenticators...), nil
}
}
// IsValidServiceAccountKeyFile returns true if a valid public RSA key can be read from the given file
func IsValidServiceAccountKeyFile(file string) bool {
_, err := serviceaccount.ReadPublicKey(file)
return err == nil
}
// newAuthenticatorFromBasicAuthFile returns an authenticator.Request or an error
func newAuthenticatorFromBasicAuthFile(basicAuthFile string) (authenticator.Request, error) {
basicAuthenticator, err := passwordfile.NewCSV(basicAuthFile)
if err != nil {
return nil, err
}
return basicauth.New(basicAuthenticator), nil
}
// newAuthenticatorFromTokenFile returns an authenticator.Request or an error
func newAuthenticatorFromTokenFile(tokenAuthFile string) (authenticator.Request, error) {
tokenAuthenticator, err := tokenfile.NewCSV(tokenAuthFile)
if err != nil {
return nil, err
}
return bearertoken.New(tokenAuthenticator), nil
}
// newAuthenticatorFromOIDCIssuerURL returns an authenticator.Request or an error.
func newAuthenticatorFromOIDCIssuerURL(issuerURL, clientID, caFile, usernameClaim string) (authenticator.Request, error) {
tokenAuthenticator, err := oidc.New(issuerURL, clientID, caFile, usernameClaim)
if err != nil {
return nil, err
}
return bearertoken.New(tokenAuthenticator), nil
}
// newServiceAccountAuthenticator returns an authenticator.Request or an error
func newServiceAccountAuthenticator(keyfile string, lookup bool, storage storage.Interface) (authenticator.Request, error) {
publicKey, err := serviceaccount.ReadPublicKey(keyfile)
if err != nil {
return nil, err
}
var serviceAccountGetter serviceaccount.ServiceAccountTokenGetter
if lookup {
// If we need to look up service accounts and tokens,
// go directly to etcd to avoid recursive auth insanity
serviceAccountGetter = serviceaccount.NewGetterFromStorageInterface(storage)
}
tokenAuthenticator := serviceaccount.JWTTokenAuthenticator([]*rsa.PublicKey{publicKey}, lookup, serviceAccountGetter)
return bearertoken.New(tokenAuthenticator), nil
}
// newAuthenticatorFromClientCAFile returns an authenticator.Request or an error
func newAuthenticatorFromClientCAFile(clientCAFile string) (authenticator.Request, error) {
roots, err := util.CertPoolFromFile(clientCAFile)
if err != nil {
return nil, err
}
opts := x509.DefaultVerifyOptions()
opts.Roots = roots
return x509.New(opts, x509.CommonNameUserConversion), nil
}
// newAuthenticatorFromTokenFile returns an authenticator.Request or an error
func newAuthenticatorFromKeystoneURL(keystoneConfigFile string) (authenticator.Request, error) {
keystoneAuthenticator, err := keystone.NewKeystoneAuthenticator(keystoneConfigFile)
if err != nil {
return nil, err
}
return basicauth.New(keystoneAuthenticator), nil
}