This repository has been archived by the owner on Apr 3, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 3
/
server.go
198 lines (176 loc) · 5.57 KB
/
server.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
/*
Copyright 2018 The Kubernetes Authors.
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 main
import (
"errors"
"fmt"
"time"
"k8s.io/kops/node-authorizer/pkg/authorizers/alwaysallow"
"k8s.io/kops/node-authorizer/pkg/authorizers/aws"
"k8s.io/kops/node-authorizer/pkg/server"
"k8s.io/kops/node-authorizer/pkg/utils"
"github.com/urfave/cli"
)
// addServerCommand creates and returns a server command
func addServerCommand() cli.Command {
return cli.Command{
Name: "server",
Usage: "starts the node-authorizer in server mode",
Flags: []cli.Flag{
cli.StringFlag{
Name: "authorizer",
Usage: "provider we should use to authorize the node registration `NAME`",
EnvVar: "AUTHORIZER",
},
cli.StringFlag{
Name: "listen",
Usage: "interface to bind the service `INTERFACE`",
EnvVar: "LISTEN",
Value: ":10443",
},
cli.StringFlag{
Name: "tls-client-ca",
Usage: "file containing the client certificate authority, required for mutual tls `PATH`",
EnvVar: "TLS_CLIENT_CA",
},
cli.StringFlag{
Name: "tls-cert",
Usage: "file containing the certificate `PATH`",
EnvVar: "TLS_CERT",
Value: "/certs/node-authorizer.pem",
},
cli.StringFlag{
Name: "tls-private-key",
Usage: "file containing the private key `PATH`",
EnvVar: "TLS_PRIVATE_KEY",
Value: "/certs/node-authorizer-key.pem",
},
cli.StringFlag{
Name: "cluster-name",
Usage: "name of the kubernetes cluster we are provisioning `NAME`",
EnvVar: "CLUSTER_NAME",
},
cli.StringFlag{
Name: "cluster-tag",
Usage: "name of the cloud tag used to identify the cluster name `NAME`",
EnvVar: "CLUSTER_TAG",
Value: "KubernetesCluster",
},
cli.StringSliceFlag{
Name: "feature",
Usage: "enables or disables a feature in the chosen authorizer `NAME`",
},
cli.DurationFlag{
Name: "token-ttl",
Usage: "expiration on created bootstrap token `DURATION`",
EnvVar: "TOKEN_TTL",
Value: 5 * time.Minute,
},
cli.StringFlag{
Name: "client-common-name",
Usage: "the common name of the client certificate when use mutual tls `NAME`",
EnvVar: "CLIENT_COMMON_NAME",
Value: "node-authorizer-client",
},
cli.DurationFlag{
Name: "certificate-ttl",
Usage: "check the certificates exist and if not wait for x period `DURATION`",
EnvVar: "CERTIFICATE_TTL",
Value: 1 * time.Hour,
},
cli.DurationFlag{
Name: "authorization-timeout",
Usage: "max time permitted for a authorization `DURATION`",
EnvVar: "AUTHORIZATION_TIMEOUT",
Value: 15 * time.Second,
},
},
Action: func(ctx *cli.Context) error {
return actionServerCommand(ctx)
},
}
}
// actionServerCommand is responsible for performing the server action
func actionServerCommand(ctx *cli.Context) error {
config := &server.Config{
AuthorizationTimeout: ctx.Duration("authorization-timeout"),
ClientCommonName: ctx.String("client-common-name"),
ClusterName: ctx.String("cluster-name"),
ClusterTag: ctx.String("cluster-tag"),
Features: ctx.StringSlice("feature"),
Listen: ctx.String("listen"),
TLSCertPath: ctx.String("tls-cert"),
TLSClientCAPath: ctx.String("tls-client-ca"),
TLSPrivateKeyPath: ctx.String("tls-private-key"),
TokenDuration: ctx.Duration("token-ttl"),
}
if ctx.String("authorizer") == "" {
return errors.New("no authorizer specified")
}
// @step: should we wait for the certificates to appear
if ctx.Duration("certificate-ttl") > 0 {
var files = []string{ctx.String("tls-cert"), ctx.String("tls-client-ca"), ctx.String("tls-private-key")}
var timeout = ctx.Duration("certificate-ttl")
if err := waitForCertificates(files, timeout); err != nil {
return err
}
}
// @step: create the authorizers
auth, err := createAuthorizer(ctx.String("authorizer"), config)
if err != nil {
return fmt.Errorf("failed to create authorizer: %v", err)
}
svc, err := server.New(config, auth)
if err != nil {
return err
}
return svc.Run()
}
// waitForCertificates is responsible for waiting for the certificates to appear
func waitForCertificates(files []string, timeout time.Duration) error {
doneCh := make(chan struct{}, 0)
go func() {
expires := time.Now().Add(timeout)
// @step: iterate the file we are looking for
for _, x := range files {
if x == "" {
continue
}
// @step: iterate until we find the file
for {
if utils.FileExists(x) {
break
}
fmt.Printf("waiting for file: %s to appear, timeouts in %s\n", x, expires.Sub(time.Now()))
time.Sleep(5 * time.Second)
}
}
doneCh <- struct{}{}
}()
select {
case <-doneCh:
return nil
case <-time.After(timeout):
return fmt.Errorf("unable to find the certificates after %s timeout", timeout)
}
}
// createAuthorizer creates and returns a authorizer
func createAuthorizer(name string, config *server.Config) (server.Authorizer, error) {
switch name {
case "alwaysallow":
return alwaysallow.NewAuthorizer()
case "aws":
return aws.NewAuthorizer(config)
}
return nil, errors.New("unknown authorizer")
}