|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "log/slog" |
| 7 | + "net" |
| 8 | + "os" |
| 9 | + "time" |
| 10 | + |
| 11 | + "github.com/spiffe/go-spiffe/v2/spiffegrpc/grpccredentials" |
| 12 | + "github.com/spiffe/go-spiffe/v2/spiffetls/tlsconfig" |
| 13 | + "github.com/spiffe/go-spiffe/v2/workloadapi" |
| 14 | + "golang.org/x/sync/errgroup" |
| 15 | + "google.golang.org/grpc" |
| 16 | + pb "google.golang.org/grpc/examples/helloworld/helloworld" |
| 17 | +) |
| 18 | + |
| 19 | +// server is used to implement helloworld.GreeterServer. |
| 20 | +type server struct { |
| 21 | + pb.UnimplementedGreeterServer |
| 22 | + log *slog.Logger |
| 23 | +} |
| 24 | + |
| 25 | +// SayHello implements helloworld.GreeterServer |
| 26 | +func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) { |
| 27 | + peer, ok := grpccredentials.PeerIDFromContext(ctx) |
| 28 | + if !ok { |
| 29 | + s.log.Info("Failed to get peer ID") |
| 30 | + } else { |
| 31 | + s.log.Info("Received request", "from", peer.String()) |
| 32 | + } |
| 33 | + return &pb.HelloReply{Message: "Pong"}, nil |
| 34 | +} |
| 35 | + |
| 36 | +func main() { |
| 37 | + if err := run(context.Background()); err != nil { |
| 38 | + slog.Error("encountered fatal error", "error", err) |
| 39 | + os.Exit(1) |
| 40 | + } |
| 41 | +} |
| 42 | + |
| 43 | +func run(ctx context.Context) error { |
| 44 | + socketPath := os.Getenv("SPIFFE_ENDPOINT_SOCKET") |
| 45 | + if socketPath == "" { |
| 46 | + return fmt.Errorf("SPIFFE_ENDPOINT_SOCKET is not defined") |
| 47 | + } |
| 48 | + listen := os.Getenv("LISTEN") |
| 49 | + if listen == "" { |
| 50 | + return fmt.Errorf("LISTEN is not defined") |
| 51 | + } |
| 52 | + target := os.Getenv("TARGET") |
| 53 | + if target == "" { |
| 54 | + return fmt.Errorf("TARGET is not defined") |
| 55 | + } |
| 56 | + |
| 57 | + source, err := workloadapi.NewX509Source(ctx, workloadapi.WithClientOptions(workloadapi.WithAddr(socketPath))) |
| 58 | + if err != nil { |
| 59 | + return fmt.Errorf("unable to create X509Source: %w", err) |
| 60 | + } |
| 61 | + defer source.Close() |
| 62 | + |
| 63 | + svid, err := source.GetX509SVID() |
| 64 | + if err != nil { |
| 65 | + return fmt.Errorf("unable to get X509SVID: %w", err) |
| 66 | + } |
| 67 | + |
| 68 | + log := slog.With("me", svid.ID.String()) |
| 69 | + |
| 70 | + eg, egCtx := errgroup.WithContext(ctx) |
| 71 | + eg.Go(func() error { |
| 72 | + // Create a server with credentials that do mTLS and verify that the presented certificate has SPIFFE ID `spiffe://example.org/client` |
| 73 | + s := grpc.NewServer(grpc.Creds( |
| 74 | + grpccredentials.MTLSServerCredentials(source, source, tlsconfig.AuthorizeAny()), |
| 75 | + )) |
| 76 | + |
| 77 | + lis, err := net.Listen("tcp", listen) |
| 78 | + if err != nil { |
| 79 | + return fmt.Errorf("error creating listener: %w", err) |
| 80 | + } |
| 81 | + |
| 82 | + pb.RegisterGreeterServer(s, &server{ |
| 83 | + log: log.With("component", "server"), |
| 84 | + }) |
| 85 | + stop := context.AfterFunc(egCtx, s.Stop) |
| 86 | + defer stop() |
| 87 | + if err := s.Serve(lis); err != nil { |
| 88 | + return fmt.Errorf("failed to serve: %w", err) |
| 89 | + } |
| 90 | + return nil |
| 91 | + }) |
| 92 | + eg.Go(func() error { |
| 93 | + log := log.With("component", "client") |
| 94 | + s, err := grpc.NewClient(target, grpc.WithTransportCredentials( |
| 95 | + grpccredentials.MTLSClientCredentials(source, source, tlsconfig.AuthorizeAny()), |
| 96 | + )) |
| 97 | + if err != nil { |
| 98 | + return fmt.Errorf("failed to create client: %w", err) |
| 99 | + } |
| 100 | + defer s.Close() |
| 101 | + |
| 102 | + greeterClient := pb.NewGreeterClient(s) |
| 103 | + |
| 104 | + for { |
| 105 | + _, err := greeterClient.SayHello(egCtx, &pb.HelloRequest{Name: "Ping"}) |
| 106 | + if err != nil { |
| 107 | + log.Error("Received error", "error", err) |
| 108 | + } else { |
| 109 | + log.Info("Sent message") |
| 110 | + } |
| 111 | + |
| 112 | + select { |
| 113 | + case <-egCtx.Done(): |
| 114 | + return nil |
| 115 | + case <-time.After(5 * time.Second): |
| 116 | + |
| 117 | + } |
| 118 | + } |
| 119 | + }) |
| 120 | + |
| 121 | + return eg.Wait() |
| 122 | +} |
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