116 lines
2.9 KiB
Go
116 lines
2.9 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package gcp_credentials
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import (
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"io/ioutil"
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"time"
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"github.com/golang/glog"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/google"
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"golang.org/x/oauth2/jwt"
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"k8s.io/kubernetes/pkg/credentialprovider"
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"github.com/spf13/pflag"
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)
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const (
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storageReadOnlyScope = "https://www.googleapis.com/auth/devstorage.read_only"
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)
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var (
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flagJwtFile = pflag.String("google-json-key", "",
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"The Google Cloud Platform Service Account JSON Key to use for authentication.")
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)
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// A DockerConfigProvider that reads its configuration from Google
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// Compute Engine metadata.
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type jwtProvider struct {
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path *string
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config *jwt.Config
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tokenUrl string
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}
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// init registers the various means by which credentials may
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// be resolved on GCP.
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func init() {
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credentialprovider.RegisterCredentialProvider("google-jwt-key",
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&credentialprovider.CachingDockerConfigProvider{
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Provider: &jwtProvider{
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path: flagJwtFile,
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},
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Lifetime: 30 * time.Minute,
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})
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}
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// Enabled implements DockerConfigProvider for the JSON Key based implementation.
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func (j *jwtProvider) Enabled() bool {
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if *j.path == "" {
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return false
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}
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data, err := ioutil.ReadFile(*j.path)
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if err != nil {
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glog.Errorf("while reading file %s got %v", *j.path, err)
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return false
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}
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config, err := google.JWTConfigFromJSON(data, storageReadOnlyScope)
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if err != nil {
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glog.Errorf("while parsing %s data got %v", *j.path, err)
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return false
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}
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j.config = config
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if j.tokenUrl != "" {
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j.config.TokenURL = j.tokenUrl
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}
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return true
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}
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// LazyProvide implements DockerConfigProvider. Should never be called.
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func (j *jwtProvider) LazyProvide() *credentialprovider.DockerConfigEntry {
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return nil
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}
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// Provide implements DockerConfigProvider
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func (j *jwtProvider) Provide() credentialprovider.DockerConfig {
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cfg := credentialprovider.DockerConfig{}
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ts := j.config.TokenSource(oauth2.NoContext)
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token, err := ts.Token()
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if err != nil {
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glog.Errorf("while exchanging json key %s for access token %v", *j.path, err)
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return cfg
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}
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if !token.Valid() {
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glog.Errorf("Got back invalid token: %v", token)
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return cfg
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}
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entry := credentialprovider.DockerConfigEntry{
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Username: "_token",
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Password: token.AccessToken,
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Email: j.config.Email,
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}
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// Add our entry for each of the supported container registry URLs
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for _, k := range containerRegistryUrls {
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cfg[k] = entry
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}
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return cfg
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}
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