Created
August 5, 2022 19:03
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A little TLS server using Cloudflare's copy of Go
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package main | |
import ( | |
"crypto/tls" | |
"encoding/base64" | |
"flag" | |
"fmt" | |
"log" | |
"net/http" | |
) | |
func main() { | |
addr := flag.String("addr", ":443", "HTTPS network address") | |
// An ECHConfig for "localhost" | |
config_base64 := "ACDXBDVq/+iMGNWtGny61W+oYUAvAWLUbrkRd3NK0Xc3nQBA/g0APAAAIAAgMaCCcld+og5XxUZqhPoaNj8VxNBCEj31FCWCgsuk/FcACAABAAEAAQADgAlsb2NhbGhvc3QAAA==" | |
dst := make([]byte, base64.StdEncoding.DecodedLen(len(config_base64))) | |
n, err := base64.StdEncoding.Decode(dst, []byte(config_base64)) | |
if err != nil { | |
fmt.Println("decode error:", err) | |
return | |
} | |
keys, err := tls.EXP_UnmarshalECHKeys(dst[:n]) | |
if err != nil { | |
fmt.Println("unmarshal error:", err) | |
return | |
} | |
key_set, err := tls.EXP_NewECHKeySet(keys) | |
if err != nil { | |
fmt.Println("error creating key set:", err) | |
return | |
} | |
mux := http.NewServeMux() | |
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) { | |
if req.URL.Path != "/" { | |
http.NotFound(w, req) | |
return | |
} | |
fmt.Fprintf(w, "Proudly served with Go and HTTPS!") | |
}) | |
srv := &http.Server{ | |
Addr: *addr, | |
Handler: mux, | |
TLSConfig: &tls.Config{ | |
ECHEnabled: true, | |
ServerECHProvider: key_set, | |
MinVersion: tls.VersionTLS13, | |
PreferServerCipherSuites: true, | |
}, | |
} | |
log.Printf("Starting server on %s", *addr) | |
err = srv.ListenAndServeTLS("example.com+5.pem", "example.com+5-key.pem") | |
log.Fatal(err) | |
} |
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