mirror of https://github.com/grpc/grpc-go.git
99 lines
3.1 KiB
Go
99 lines
3.1 KiB
Go
/*
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*
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* Copyright 2020 gRPC authors.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*/
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// The client demonstrates how to use the credential reloading feature in
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// advancedtls to make a mTLS connection to the server.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials/tls/certprovider/pemfile"
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pb "google.golang.org/grpc/examples/helloworld/helloworld"
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"google.golang.org/grpc/security/advancedtls"
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"google.golang.org/grpc/security/advancedtls/testdata"
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)
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var address = "localhost:50051"
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const (
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// Default timeout for normal connections.
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defaultConnTimeout = 10 * time.Second
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// Intervals that set to monitor the credential updates.
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credRefreshingInterval = 1 * time.Minute
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)
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func main() {
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flag.Parse()
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identityOptions := pemfile.Options{
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CertFile: testdata.Path("client_cert_1.pem"),
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KeyFile: testdata.Path("client_key_1.pem"),
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RefreshDuration: credRefreshingInterval,
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}
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identityProvider, err := pemfile.NewProvider(identityOptions)
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if err != nil {
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log.Fatalf("pemfile.NewProvider(%v) failed: %v", identityOptions, err)
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}
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rootOptions := pemfile.Options{
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RootFile: testdata.Path("client_trust_cert_1.pem"),
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RefreshDuration: credRefreshingInterval,
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}
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rootProvider, err := pemfile.NewProvider(rootOptions)
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if err != nil {
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log.Fatalf("pemfile.NewProvider(%v) failed: %v", rootOptions, err)
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}
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options := &advancedtls.ClientOptions{
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IdentityOptions: advancedtls.IdentityCertificateOptions{
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IdentityProvider: identityProvider,
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},
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VerifyPeer: func(params *advancedtls.VerificationFuncParams) (*advancedtls.VerificationResults, error) {
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return &advancedtls.VerificationResults{}, nil
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},
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RootOptions: advancedtls.RootCertificateOptions{
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RootProvider: rootProvider,
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},
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VType: advancedtls.CertVerification,
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}
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clientTLSCreds, err := advancedtls.NewClientCreds(options)
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if err != nil {
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log.Fatalf("advancedtls.NewClientCreds(%v) failed: %v", options, err)
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}
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// At initialization, the connection should be good.
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ctx, cancel := context.WithTimeout(context.Background(), defaultConnTimeout)
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defer cancel()
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conn, err := grpc.DialContext(ctx, address, grpc.WithTransportCredentials(clientTLSCreds))
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if err != nil {
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log.Fatalf("grpc.DialContext to %s failed: %v", address, err)
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}
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greetClient := pb.NewGreeterClient(conn)
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reply, err := greetClient.SayHello(ctx, &pb.HelloRequest{Name: "gRPC"}, grpc.WaitForReady(true))
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if err != nil {
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log.Fatalf("greetClient.SayHello failed: %v", err)
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}
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defer conn.Close()
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fmt.Printf("Getting message from server: %s...\n", reply.Message)
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}
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