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// Package tlscert generates the in-memory self-signed certificate used when a
// TLS transport is enabled without an explicit cert/key pair.
package tlscert
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"fmt"
"math/big"
"net"
"time"
)
// SelfSigned generates a self-signed certificate for commonName, valid for a
// year, covering localhost and the loopback addresses. Shared by the game
// server and the admin server so the two cannot drift.
func SelfSigned(commonName string) (tls.Certificate, error) {
key, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return tls.Certificate{}, fmt.Errorf("rsa key generation: %w", err)
}
serial, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
if err != nil {
return tls.Certificate{}, fmt.Errorf("serial number: %w", err)
}
now := time.Now()
tmpl := &x509.Certificate{
SerialNumber: serial,
Subject: pkix.Name{
CommonName: commonName,
},
NotBefore: now.Add(-1 * time.Hour),
NotAfter: now.Add(365 * 24 * time.Hour),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IsCA: true,
DNSNames: []string{"localhost"},
IPAddresses: []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("::1")},
}
certDER, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &key.PublicKey, key)
if err != nil {
return tls.Certificate{}, fmt.Errorf("x509 creation: %w", err)
}
return tls.Certificate{
Certificate: [][]byte{certDER},
PrivateKey: key,
}, nil
}
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