root: initial go proxy, update compose and helm

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/crypto/generate.go

@@ -0,0 +1,90 @@
+package crypto
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"math/big"
+	"net"
+	"os"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func GenerateKeypair(hosts []string) {
+	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		log.Fatalf("Failed to generate private key: %v", err)
+	}
+
+	keyUsage := x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
+
+	notBefore := time.Now()
+	notAfter := notBefore.Add(365 * 24 * time.Hour)
+
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
+	if err != nil {
+		log.Fatalf("Failed to generate serial number: %v", err)
+	}
+
+	template := x509.Certificate{
+		SerialNumber: serialNumber,
+		Subject: pkix.Name{
+			Organization: []string{"BeryJu.org"},
+		},
+		NotBefore: notBefore,
+		NotAfter:  notAfter,
+
+		KeyUsage:              keyUsage,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+	}
+
+	for _, h := range hosts {
+		if ip := net.ParseIP(h); ip != nil {
+			template.IPAddresses = append(template.IPAddresses, ip)
+		} else {
+			template.DNSNames = append(template.DNSNames, h)
+		}
+	}
+
+	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, priv, priv)
+	if err != nil {
+		log.Fatalf("Failed to create certificate: %v", err)
+	}
+
+	certOut, err := os.Create("cert.pem")
+	if err != nil {
+		log.Fatalf("Failed to open cert.pem for writing: %v", err)
+	}
+	if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
+		log.Fatalf("Failed to write data to cert.pem: %v", err)
+	}
+	if err := certOut.Close(); err != nil {
+		log.Fatalf("Error closing cert.pem: %v", err)
+	}
+	log.Print("wrote cert.pem\n")
+
+	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		log.Fatalf("Failed to open key.pem for writing: %v", err)
+		return
+	}
+	privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
+	if err != nil {
+		log.Fatalf("Unable to marshal private key: %v", err)
+	}
+	if err := pem.Encode(keyOut, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
+		log.Fatalf("Failed to write data to key.pem: %v", err)
+	}
+	if err := keyOut.Close(); err != nil {
+		log.Fatalf("Error closing key.pem: %v", err)
+	}
+	log.Print("wrote key.pem\n")
+	return
+}