mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-31 05:40:42 +00:00
275 lines
7.7 KiB
Go
275 lines
7.7 KiB
Go
/*
|
|
Copyright 2016 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 gcp
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"fmt"
|
|
"net/http"
|
|
"os/exec"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/golang/glog"
|
|
"golang.org/x/net/context"
|
|
"golang.org/x/oauth2"
|
|
"golang.org/x/oauth2/google"
|
|
"k8s.io/kubernetes/pkg/client/restclient"
|
|
"k8s.io/kubernetes/pkg/util/jsonpath"
|
|
"k8s.io/kubernetes/pkg/util/yaml"
|
|
)
|
|
|
|
func init() {
|
|
if err := restclient.RegisterAuthProviderPlugin("gcp", newGCPAuthProvider); err != nil {
|
|
glog.Fatalf("Failed to register gcp auth plugin: %v", err)
|
|
}
|
|
}
|
|
|
|
// gcpAuthProvider is an auth provider plugin that uses GCP credentials to provide
|
|
// tokens for kubectl to authenticate itself to the apiserver. A sample json config
|
|
// is provided below with all recognized options described.
|
|
//
|
|
// {
|
|
// 'auth-provider': {
|
|
// # Required
|
|
// "name": "gcp",
|
|
//
|
|
// 'config': {
|
|
// # Caching options
|
|
//
|
|
// # Raw string data representing cached access token.
|
|
// "access-token": "ya29.CjWdA4GiBPTt",
|
|
// # RFC3339Nano expiration timestamp for cached access token.
|
|
// "expiry": "2016-10-31 22:31:9.123",
|
|
//
|
|
// # Command execution options
|
|
// # These options direct the plugin to execute a specified command and parse
|
|
// # token and expiry time from the output of the command.
|
|
//
|
|
// # Command to execute for access token. String is split on whitespace
|
|
// # with first field treated as the executable, remaining fields as args.
|
|
// # Command output will be parsed as JSON.
|
|
// "cmd-path": "/usr/bin/gcloud config config-helper --output=json",
|
|
//
|
|
// # JSONPath to the string field that represents the access token in
|
|
// # command output. If omitted, defaults to "{.access_token}".
|
|
// "token-key": "{.credential.access_token}",
|
|
//
|
|
// # JSONPath to the string field that represents expiration timestamp
|
|
// # of the access token in the command output. If omitted, defaults to
|
|
// # "{.token_expiry}"
|
|
// "expiry-key": ""{.credential.token_expiry}",
|
|
//
|
|
// # golang reference time in the format that the expiration timestamp uses.
|
|
// # If omitted, defaults to time.RFC3339Nano
|
|
// "time-fmt": "2006-01-02 15:04:05.999999999"
|
|
// }
|
|
// }
|
|
// }
|
|
//
|
|
type gcpAuthProvider struct {
|
|
tokenSource oauth2.TokenSource
|
|
persister restclient.AuthProviderConfigPersister
|
|
}
|
|
|
|
func newGCPAuthProvider(_ string, gcpConfig map[string]string, persister restclient.AuthProviderConfigPersister) (restclient.AuthProvider, error) {
|
|
cmd, useCmd := gcpConfig["cmd-path"]
|
|
var ts oauth2.TokenSource
|
|
var err error
|
|
if useCmd {
|
|
ts, err = newCmdTokenSource(cmd, gcpConfig["token-key"], gcpConfig["expiry-key"], gcpConfig["time-fmt"])
|
|
} else {
|
|
ts, err = google.DefaultTokenSource(context.Background(), "https://www.googleapis.com/auth/cloud-platform")
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cts, err := newCachedTokenSource(gcpConfig["access-token"], gcpConfig["expiry"], persister, ts, gcpConfig)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &gcpAuthProvider{cts, persister}, nil
|
|
}
|
|
|
|
func (g *gcpAuthProvider) WrapTransport(rt http.RoundTripper) http.RoundTripper {
|
|
return &oauth2.Transport{
|
|
Source: g.tokenSource,
|
|
Base: rt,
|
|
}
|
|
}
|
|
|
|
func (g *gcpAuthProvider) Login() error { return nil }
|
|
|
|
type cachedTokenSource struct {
|
|
lk sync.Mutex
|
|
source oauth2.TokenSource
|
|
accessToken string
|
|
expiry time.Time
|
|
persister restclient.AuthProviderConfigPersister
|
|
cache map[string]string
|
|
}
|
|
|
|
func newCachedTokenSource(accessToken, expiry string, persister restclient.AuthProviderConfigPersister, ts oauth2.TokenSource, cache map[string]string) (*cachedTokenSource, error) {
|
|
var expiryTime time.Time
|
|
if parsedTime, err := time.Parse(time.RFC3339Nano, expiry); err == nil {
|
|
expiryTime = parsedTime
|
|
}
|
|
if cache == nil {
|
|
cache = make(map[string]string)
|
|
}
|
|
return &cachedTokenSource{
|
|
source: ts,
|
|
accessToken: accessToken,
|
|
expiry: expiryTime,
|
|
persister: persister,
|
|
cache: cache,
|
|
}, nil
|
|
}
|
|
|
|
func (t *cachedTokenSource) Token() (*oauth2.Token, error) {
|
|
tok := t.cachedToken()
|
|
if tok.Valid() && !tok.Expiry.IsZero() {
|
|
return tok, nil
|
|
}
|
|
tok, err := t.source.Token()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cache := t.update(tok)
|
|
if t.persister != nil {
|
|
if err := t.persister.Persist(cache); err != nil {
|
|
glog.V(4).Infof("Failed to persist token: %v", err)
|
|
}
|
|
}
|
|
return tok, nil
|
|
}
|
|
|
|
func (t *cachedTokenSource) cachedToken() *oauth2.Token {
|
|
t.lk.Lock()
|
|
defer t.lk.Unlock()
|
|
return &oauth2.Token{
|
|
AccessToken: t.accessToken,
|
|
TokenType: "Bearer",
|
|
Expiry: t.expiry,
|
|
}
|
|
}
|
|
|
|
func (t *cachedTokenSource) update(tok *oauth2.Token) map[string]string {
|
|
t.lk.Lock()
|
|
defer t.lk.Unlock()
|
|
t.accessToken = tok.AccessToken
|
|
t.expiry = tok.Expiry
|
|
ret := map[string]string{}
|
|
for k, v := range t.cache {
|
|
ret[k] = v
|
|
}
|
|
ret["access-token"] = t.accessToken
|
|
ret["expiry"] = t.expiry.Format(time.RFC3339Nano)
|
|
return ret
|
|
}
|
|
|
|
type commandTokenSource struct {
|
|
cmd string
|
|
args []string
|
|
tokenKey string
|
|
expiryKey string
|
|
timeFmt string
|
|
}
|
|
|
|
func newCmdTokenSource(cmd, tokenKey, expiryKey, timeFmt string) (*commandTokenSource, error) {
|
|
if len(timeFmt) == 0 {
|
|
timeFmt = time.RFC3339Nano
|
|
}
|
|
if len(tokenKey) == 0 {
|
|
tokenKey = "{.access_token}"
|
|
}
|
|
if len(expiryKey) == 0 {
|
|
expiryKey = "{.token_expiry}"
|
|
}
|
|
fields := strings.Fields(cmd)
|
|
if len(fields) == 0 {
|
|
return nil, fmt.Errorf("missing access token cmd")
|
|
}
|
|
return &commandTokenSource{
|
|
cmd: fields[0],
|
|
args: fields[1:],
|
|
tokenKey: tokenKey,
|
|
expiryKey: expiryKey,
|
|
timeFmt: timeFmt,
|
|
}, nil
|
|
}
|
|
|
|
func (c *commandTokenSource) Token() (*oauth2.Token, error) {
|
|
fullCmd := fmt.Sprintf("%s %s", c.cmd, strings.Join(c.args, " "))
|
|
cmd := exec.Command(c.cmd, c.args...)
|
|
output, err := cmd.Output()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error executing access token command %q: %v", fullCmd, err)
|
|
}
|
|
token, err := c.parseTokenCmdOutput(output)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing output for access token command %q: %v", fullCmd, err)
|
|
}
|
|
return token, nil
|
|
}
|
|
|
|
func (c *commandTokenSource) parseTokenCmdOutput(output []byte) (*oauth2.Token, error) {
|
|
output, err := yaml.ToJSON(output)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var data interface{}
|
|
if err := json.Unmarshal(output, &data); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
accessToken, err := parseJSONPath(data, "token-key", c.tokenKey)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing token-key %q: %v", c.tokenKey, err)
|
|
}
|
|
expiryStr, err := parseJSONPath(data, "expiry-key", c.expiryKey)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error parsing expiry-key %q: %v", c.expiryKey, err)
|
|
}
|
|
var expiry time.Time
|
|
if t, err := time.Parse(c.timeFmt, expiryStr); err != nil {
|
|
glog.V(4).Infof("Failed to parse token expiry from %s (fmt=%s): %v", expiryStr, c.timeFmt, err)
|
|
} else {
|
|
expiry = t
|
|
}
|
|
|
|
return &oauth2.Token{
|
|
AccessToken: accessToken,
|
|
TokenType: "Bearer",
|
|
Expiry: expiry,
|
|
}, nil
|
|
}
|
|
|
|
func parseJSONPath(input interface{}, name, template string) (string, error) {
|
|
j := jsonpath.New(name)
|
|
buf := new(bytes.Buffer)
|
|
if err := j.Parse(template); err != nil {
|
|
return "", err
|
|
}
|
|
if err := j.Execute(buf, input); err != nil {
|
|
return "", err
|
|
}
|
|
return buf.String(), nil
|
|
}
|