mirror of https://github.com/grpc/grpc-go.git
112 lines
3.6 KiB
Go
112 lines
3.6 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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"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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defaultTimeout = 2 * time.Second
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// Intervals that set to monitor the credential updates.
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credRefreshingInterval = 500 * time.Millisecond
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)
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func main() {
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tmpKeyFile := flag.String("key", "", "temporary key file path")
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tmpCertFile := flag.String("cert", "", "temporary cert file path")
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flag.Parse()
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if tmpKeyFile == nil || *tmpKeyFile == "" {
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log.Fatalf("tmpKeyFile is nil or empty.")
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}
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if tmpCertFile == nil || *tmpCertFile == "" {
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log.Fatalf("tmpCertFile is nil or empty.")
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}
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// Initialize credential struct using reloading API.
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identityOptions := pemfile.Options{
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CertFile: *tmpCertFile,
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KeyFile: *tmpKeyFile,
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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.Options{
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IdentityOptions: advancedtls.IdentityCertificateOptions{
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IdentityProvider: identityProvider,
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},
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AdditionalPeerVerification: func(*advancedtls.HandshakeVerificationInfo) (*advancedtls.PostHandshakeVerificationResults, error) {
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return &advancedtls.PostHandshakeVerificationResults{}, 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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VerificationType: 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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// Make a connection using the credentials.
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conn, err := grpc.NewClient(address, grpc.WithTransportCredentials(clientTLSCreds))
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if err != nil {
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log.Fatalf("grpc.NewClient to %s failed: %v", address, err)
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}
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client := pb.NewGreeterClient(conn)
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// Send the requests every 0.5s. The credential is expected to be changed in
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// the bash script. We don't cancel the context nor call conn.Close() here,
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// since the bash script is expected to close the client goroutine.
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for {
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ctx, cancel := context.WithTimeout(context.Background(), defaultTimeout)
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_, err = client.SayHello(ctx, &pb.HelloRequest{Name: "gRPC"}, grpc.WaitForReady(true))
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if err != nil {
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log.Fatalf("client.SayHello failed: %v", err)
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}
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cancel()
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time.Sleep(500 * time.Millisecond)
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}
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}
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