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Signed-off-by: Bipul Adhikari <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package kubernetes | ||
|
|
||
| import ( | ||
| "io" | ||
| "os" | ||
| ) | ||
|
|
||
| func GetNamespace() (string, error) { | ||
| namespaceFile := "/var/run/secrets/kubernetes.io/serviceaccount/namespace" | ||
| file, err := os.Open(namespaceFile) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer file.Close() | ||
|
|
||
| data, err := io.ReadAll(file) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return string(data), nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| /* | ||
| Copyright 2024 The Kubernetes-CSI-Addons 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 token | ||
|
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
|
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| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/codes" | ||
| "google.golang.org/grpc/metadata" | ||
| "google.golang.org/grpc/status" | ||
| authv1 "k8s.io/api/authentication/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| ) | ||
|
|
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| type tokenResolver struct { | ||
| kubeclient *kubernetes.Clientset | ||
| namespace string | ||
| serviceAccount string | ||
|
|
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| token string | ||
| expiration metav1.Time | ||
| } | ||
|
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| func WithServiceAccountToken(kubeclient *kubernetes.Clientset, namespace, serviceAccount string) grpc.DialOption { | ||
| tr := tokenResolver{ | ||
| kubeclient: kubeclient, | ||
| namespace: namespace, | ||
| serviceAccount: serviceAccount, | ||
| expiration: metav1.Now(), | ||
| } | ||
|
|
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| return grpc.WithUnaryInterceptor(tr.addAuthorizationHeader) | ||
| } | ||
|
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| func (tr *tokenResolver) addAuthorizationHeader(ctx context.Context, method string, req, reply any, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error { | ||
| token, err := tr.getToken(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| authCtx := metadata.AppendToOutgoingContext(ctx, "Authorization", "Bearer "+token) | ||
| return invoker(authCtx, method, req, reply, cc, opts...) | ||
| } | ||
|
|
||
| func (tr *tokenResolver) getToken(ctx context.Context) (string, error) { | ||
| now := metav1.Now() | ||
| if tr.expiration.Before(&now) { | ||
| // token expired | ||
| return tr.refreshToken(ctx) | ||
| } | ||
|
|
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| return tr.token, nil | ||
| } | ||
|
|
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| func (tr *tokenResolver) refreshToken(ctx context.Context) (string, error) { | ||
| treq := &authv1.TokenRequest{ | ||
| Spec: authv1.TokenRequestSpec{ | ||
| Audiences: []string{"csi-addons"}, | ||
| }, | ||
| } | ||
|
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| tres, err := tr.kubeclient.CoreV1().ServiceAccounts(tr.namespace).CreateToken(ctx, tr.serviceAccount, treq, metav1.CreateOptions{}) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
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| tr.token = tres.Status.Token | ||
| tr.expiration = tres.Status.ExpirationTimestamp | ||
|
|
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| return tr.token, nil | ||
| } | ||
|
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| func AuthorizationInterceptor(kubeclient *kubernetes.Clientset) grpc.UnaryServerInterceptor { | ||
| return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) { | ||
| if err := authorizeConnection(kubeclient, ctx); err != nil { | ||
| return nil, err | ||
| } | ||
| return handler(ctx, req) | ||
| } | ||
| } | ||
|
|
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| func authorizeConnection(kubeclient *kubernetes.Clientset, ctx context.Context) error { | ||
|
|
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| md, ok := metadata.FromIncomingContext(ctx) | ||
| if !ok { | ||
| return status.Errorf(codes.Unauthenticated, "missing metadata") | ||
| } | ||
|
|
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| authHeader, ok := md["authorization"] | ||
| if !ok || len(authHeader) == 0 { | ||
| return status.Errorf(codes.Unauthenticated, "missing authorization token") | ||
| } | ||
|
|
||
| token := authHeader[0] | ||
| isValidated, err := validateBearerToken(token, kubeclient) | ||
| if !isValidated || err != nil { | ||
| return status.Errorf(codes.Unauthenticated, "invalid token") | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| func validateBearerToken(token string, kubeclient *kubernetes.Clientset) (bool, error) { | ||
| tokenReview := &authv1.TokenReview{ | ||
| Spec: authv1.TokenReviewSpec{ | ||
| Token: token, | ||
| }, | ||
| } | ||
| result, err := kubeclient.AuthenticationV1().TokenReviews().Create(context.TODO(), tokenReview, metav1.CreateOptions{}) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to review token %v", err) | ||
| } | ||
|
|
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| if result.Status.Authenticated { | ||
| return true, nil | ||
| } | ||
| return false, nil | ||
| } | ||
|
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| func GetServerCert() (string, error) { | ||
| certFile := "/etc/tls/ca.crt" | ||
| file, err := os.Open(certFile) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer file.Close() | ||
|
|
||
| data, err := io.ReadAll(file) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return string(data), nil | ||
| } |
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