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package main
import (
"context"
"fmt"
"log"
"net"
"github.com/spiffe/go-spiffe/v2/spiffegrpc/grpccredentials"
"github.com/spiffe/go-spiffe/v2/spiffeid"
"github.com/spiffe/go-spiffe/v2/spiffetls/tlsconfig"
"github.com/spiffe/go-spiffe/v2/workloadapi"
"google.golang.org/grpc"
pb "google.golang.org/grpc/examples/helloworld/helloworld"
)
const socketPath = "unix:///tmp/agent.sock"
// server is used to implement helloworld.GreeterServer.
type server struct {
pb.UnimplementedGreeterServer
}
// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
log.Printf("Received: %v", in.GetName())
return &pb.HelloReply{Message: "Hello " + in.GetName()}, nil
}
func main() {
if err := run(context.Background()); err != nil {
log.Fatal(err)
}
}
func run(ctx context.Context) error {
// Create a `workloadapi.X509Source`, it will connect to Workload API using provided socket path
// If socket path is not defined using `workloadapi.SourceOption`, value from environment variable `SPIFFE_ENDPOINT_SOCKET` is used.
source, err := workloadapi.NewX509Source(ctx, workloadapi.WithClientOptions(workloadapi.WithAddr(socketPath)))
if err != nil {
return fmt.Errorf("unable to create X509Source: %w", err)
}
defer source.Close()
// Allowed SPIFFE ID
clientID := spiffeid.RequireFromString("spiffe://example.org/client")
// Create a server with credentials that do mTLS and verify that the presented certificate has SPIFFE ID `spiffe://example.org/client`
s := grpc.NewServer(grpc.Creds(
grpccredentials.MTLSServerCredentials(source, source, tlsconfig.AuthorizeID(clientID)),
))
lis, err := net.Listen("tcp", "127.0.0.1:50051")
if err != nil {
return fmt.Errorf("error creating listener: %w", err)
}
pb.RegisterGreeterServer(s, &server{})
if err := s.Serve(lis); err != nil {
return fmt.Errorf("failed to serve: %w", err)
}
return nil
}
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