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package main
import (
"context"
"fmt"
"log"
"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"
)
// Workload API socket path
const socketPath = "unix:///tmp/agent.sock"
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
serverID := spiffeid.RequireFromString("spiffe://example.org/server")
// Dial the server with credentials that do mTLS and verify that presented certificate has SPIFFE ID `spiffe://example.org/server`
conn, err := grpc.NewClient("dns:///localhost:50051", grpc.WithTransportCredentials(
grpccredentials.MTLSClientCredentials(source, source, tlsconfig.AuthorizeID(serverID)),
))
if err != nil {
return fmt.Errorf("failed to dial: %w", err)
}
client := pb.NewGreeterClient(conn)
reply, err := client.SayHello(ctx, &pb.HelloRequest{Name: "world"})
if err != nil {
return fmt.Errorf("failed issuing RPC to server: %w", err)
}
log.Print(reply.Message)
return nil
}
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