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Adds support for TLS and token reviews
Signed-off-by: Bipul Adhikari <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /* | ||
| 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 | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "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" | ||
| ) | ||
|
|
||
| const bearerPrefix = "Bearer " | ||
|
|
||
| func WithServiceAccountToken() grpc.DialOption { | ||
| return grpc.WithUnaryInterceptor(addAuthorizationHeader) | ||
| } | ||
|
|
||
| func addAuthorizationHeader(ctx context.Context, method string, req, reply any, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error { | ||
| token, err := getToken() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| authCtx := metadata.AppendToOutgoingContext(ctx, "Authorization", "Bearer "+token) | ||
| return invoker(authCtx, method, req, reply, cc, opts...) | ||
| } | ||
|
|
||
| func getToken() (string, error) { | ||
|
|
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| const tokenPath = "/var/run/secrets/kubernetes.io/serviceaccount/token" | ||
| return readFile(tokenPath) | ||
| } | ||
|
|
||
| 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(ctx, kubeclient); err != nil { | ||
| return nil, err | ||
| } | ||
| return handler(ctx, req) | ||
| } | ||
| } | ||
|
|
||
| func authorizeConnection(ctx context.Context, kubeclient kubernetes.Clientset) error { | ||
|
|
||
| md, ok := metadata.FromIncomingContext(ctx) | ||
| if !ok { | ||
| return status.Error(codes.Unauthenticated, "missing metadata") | ||
| } | ||
|
|
||
| authHeader, ok := md["authorization"] | ||
| if !ok || len(authHeader) == 0 { | ||
| return status.Error(codes.Unauthenticated, "missing authorization token") | ||
| } | ||
|
|
||
| token := authHeader[0] | ||
| isValidated, err := validateBearerToken(ctx, token, kubeclient) | ||
| if !isValidated || (err != nil) { | ||
| return status.Error(codes.Unauthenticated, fmt.Sprint("invalid token: %w", err)) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func parseToken(authHeader string) string { | ||
| return strings.TrimPrefix(authHeader, bearerPrefix) | ||
| } | ||
|
|
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| func validateBearerToken(ctx context.Context, token string, kubeclient kubernetes.Clientset) (bool, error) { | ||
| tokenReview := &authv1.TokenReview{ | ||
| Spec: authv1.TokenReviewSpec{ | ||
| Token: parseToken(token), | ||
| }, | ||
| } | ||
| result, err := kubeclient.AuthenticationV1().TokenReviews().Create(ctx, tokenReview, metav1.CreateOptions{}) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to review token %w", err) | ||
| } | ||
|
|
||
| if result.Status.Authenticated { | ||
| return true, nil | ||
| } | ||
| return false, nil | ||
| } | ||
|
|
||
| func readFile(filePath string) (string, error) { | ||
| file, err := os.Open(filePath) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer file.Close() | ||
|
|
||
| data, err := io.ReadAll(file) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return string(data), nil | ||
| } | ||
|
|
||
| func GetCACert() (string, error) { | ||
| caCertFile := "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt" | ||
| return readFile(caCertFile) | ||
| } |
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