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package main
import (
"context"
"fmt"
"log"
"net/http"
"net/http/httputil"
"net/url"
"time"
"github.com/spiffe/go-spiffe/v2/spiffeid"
"github.com/spiffe/go-spiffe/v2/spiffetls/tlsconfig"
"github.com/spiffe/go-spiffe/v2/workloadapi"
)
const socketPath = "unix:///tmp/agent.sock"
func main() {
if err := run(context.Background()); err != nil {
log.Fatal(err)
}
}
func run(ctx context.Context) error {
remote, err := url.Parse("https://localhost:8080")
if err != nil {
return fmt.Errorf("unable to parse server URL: %w", err)
}
// Set a timeout to prevent the request from hanging if this workload is not properly registered in SPIRE.
ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
defer cancel()
// Create an X509Source struct to fetch a SPIFFE X.509-SVID automatically from the
// Workload API, and use it to establish the TLS connection by presenting it
// to the client.
x509Source, err := workloadapi.NewX509Source(
ctx,
workloadapi.WithClientOptions(workloadapi.WithAddr(socketPath)),
)
if err != nil {
return fmt.Errorf("unable to create X509Source: %w", err)
}
defer x509Source.Close()
// Create a ReverseProxy using a TLSClient config that can connect only
// to a server that presents an X.509-SVID having "spiffe://example.org/server"
// as its SPIFFE ID.
proxy := httputil.NewSingleHostReverseProxy(remote)
transport := *(http.DefaultTransport.(*http.Transport)) //nolint
transport.TLSClientConfig = tlsconfig.TLSClientConfig(
x509Source, tlsconfig.AuthorizeID(spiffeid.RequireFromString("spiffe://example.org/server")),
)
proxy.Transport = &transport
http.HandleFunc("/", handler(proxy))
// Create an HTTP server using a TLS configuration that doesn't require
// client certificates, because the proxy is not in charge of authenticating
// the clients.
server := &http.Server{
Addr: ":8443",
TLSConfig: tlsconfig.TLSServerConfig(x509Source),
ReadHeaderTimeout: time.Second * 10,
}
if err := server.ListenAndServeTLS("", ""); err != nil {
return fmt.Errorf("failed to serve: %w", err)
}
return nil
}
func handler(p *httputil.ReverseProxy) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
log.Printf("%s %s", r.Method, r.URL)
p.ServeHTTP(w, r)
}
}
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