/
gcp.go
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/
gcp.go
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// Copyright 2017 Istio 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 platform
import (
"fmt"
"istio.io/istio/pkg/spiffe"
"cloud.google.com/go/compute/metadata"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"istio.io/istio/pkg/log"
cred "istio.io/istio/security/pkg/credential"
)
const (
bearerTokenScheme = "Bearer"
httpAuthHeader = "authorization"
)
type jwtAccess struct {
token string
}
func (j *jwtAccess) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
return map[string]string{
httpAuthHeader: fmt.Sprintf("%s %s", bearerTokenScheme, j.token),
}, nil
}
func (j *jwtAccess) RequireTransportSecurity() bool {
return true
}
// GcpClientImpl is the implementation of GCP metadata client.
type GcpClientImpl struct {
// Root CA cert file to validate the gRPC service in CA.
rootCertFile string
// Istio CA grpc server
caAddr string
fetcher cred.TokenFetcher
}
// NewGcpClientImpl creates a new GcpClientImpl.
func NewGcpClientImpl(rootCert, ca string) *GcpClientImpl {
return &GcpClientImpl{
rootCertFile: rootCert,
caAddr: ca,
// The expected token is independent of the URL of the server.
fetcher: &cred.GcpTokenFetcher{Aud: "grpc://istio-citadel:8060"},
}
}
// IsProperPlatform returns whether the client is on GCE.
func (ci *GcpClientImpl) IsProperPlatform() bool {
return metadata.OnGCE()
}
// GetDialOptions returns the GRPC dial options to connect to the CA.
func (ci *GcpClientImpl) GetDialOptions() ([]grpc.DialOption, error) {
jwtKey, err := ci.fetcher.FetchToken()
if err != nil {
log.Errorf("Failed to get token for dial option with error %s", err)
return nil, err
}
creds, err := credentials.NewClientTLSFromFile(ci.rootCertFile, CitadelDNSSan)
if err != nil {
return nil, err
}
options := []grpc.DialOption{grpc.WithPerRPCCredentials(&jwtAccess{jwtKey}),
grpc.WithTransportCredentials(creds)}
return options, nil
}
// GetServiceIdentity gets the identity of the GCE service.
func (ci *GcpClientImpl) GetServiceIdentity() (string, error) {
serviceAccount, err := ci.fetcher.FetchServiceAccount()
if err != nil {
log.Errorf("Failed to get service account with error: %v", err)
return "", err
}
return spiffe.GenSpiffeURI("default", serviceAccount)
}
// GetAgentCredential returns the GCP JWT for the serivce account.
func (ci *GcpClientImpl) GetAgentCredential() ([]byte, error) {
jwtKey, err := ci.fetcher.FetchToken()
if err != nil {
log.Errorf("Failed to get creds with error %s", err)
return nil, err
}
return []byte(jwtKey), nil
}
// GetCredentialType returns the credential type as "gcp".
func (ci *GcpClientImpl) GetCredentialType() string {
return "gcp"
}