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multidomain.go
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multidomain.go
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package main
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"time"
"github.com/valyala/fasthttp"
)
var domains = make(map[string]fasthttp.RequestHandler)
func main() {
server := &fasthttp.Server{
// You can check the access using openssl command:
// $ openssl s_client -connect localhost:8080 << EOF
// > GET /
// > Host: localhost
// > EOF
//
// $ openssl s_client -connect localhost:8080 << EOF
// > GET /
// > Host: 127.0.0.1:8080
// > EOF
//
Handler: func(ctx *fasthttp.RequestCtx) {
h, ok := domains[string(ctx.Host())]
if !ok {
ctx.NotFound()
return
}
h(ctx)
},
}
// preparing first host
cert, priv, err := GenerateCert("localhost:8080")
if err != nil {
panic(err)
}
domains["localhost:8080"] = func(ctx *fasthttp.RequestCtx) {
ctx.Write([]byte("You are accessing to localhost:8080\n"))
}
err = server.AppendCertEmbed(cert, priv)
if err != nil {
panic(err)
}
// preparing second host
cert, priv, err = GenerateCert("127.0.0.1")
if err != nil {
panic(err)
}
domains["127.0.0.1:8080"] = func(ctx *fasthttp.RequestCtx) {
ctx.Write([]byte("You are accessing to 127.0.0.1:8080\n"))
}
err = server.AppendCertEmbed(cert, priv)
if err != nil {
panic(err)
}
fmt.Println(server.ListenAndServeTLS(":8080", "", ""))
}
func GenerateCert(host string) ([]byte, []byte, error) {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, err
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, nil, err
}
cert := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"I have your data"},
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(365 * 24 * time.Hour),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
SignatureAlgorithm: x509.SHA256WithRSA,
DNSNames: []string{host},
BasicConstraintsValid: true,
IsCA: true,
}
certBytes, err := x509.CreateCertificate(
rand.Reader, cert, cert, &priv.PublicKey, priv,
)
p := pem.EncodeToMemory(
&pem.Block{
Type: "PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(priv),
},
)
b := pem.EncodeToMemory(
&pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
},
)
return b, p, err
}