first commit

config/certs.go

@@ -0,0 +1,97 @@
+package config
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	"math/big"
+	"os"
+	"time"
+)
+
+var selfSignedTLSCertificate []byte = []byte{}
+var selfSignedTLSKey []byte = []byte{}
+
+func GetTLSCertificate() []byte {
+	return selfSignedTLSCertificate
+}
+
+func GetTLSKey() []byte {
+	return selfSignedTLSKey
+}
+
+func generateSelfSignedTLSCertificate() error {
+	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		return err
+	}
+
+	serialNumber, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
+	if err != nil {
+		return err
+	}
+
+	template := x509.Certificate{
+		SerialNumber: serialNumber,
+		Subject: pkix.Name{
+			CommonName: "ablage",
+		},
+		NotBefore:             time.Now(),
+		NotAfter:              time.Now().Add(365 * 24 * time.Hour),
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+	}
+
+	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &privateKey.PublicKey, privateKey)
+	if err != nil {
+		return err
+	}
+
+	cert := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
+	key, err := x509.MarshalECPrivateKey(privateKey)
+	if err != nil {
+		return err
+	}
+	keyPEM := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: key})
+
+	selfSignedTLSCertificate = cert
+	selfSignedTLSKey = keyPEM
+
+	return nil
+}
+
+func loadOrGenerateTLSCertificate() error {
+	if GetHttpMode() {
+		return nil
+	}
+
+	if pathTLSCertFile == "" || pathTLSKeyFile == "" {
+		return generateSelfSignedTLSCertificate()
+	}
+
+	_, err := tls.LoadX509KeyPair(pathTLSCertFile, pathTLSKeyFile)
+	if err != nil {
+		return fmt.Errorf("Error: Failed to load TLS certificate or key: %w", err)
+	}
+
+	certData, err := os.ReadFile(pathTLSCertFile)
+	if err != nil {
+		return fmt.Errorf("Error: Failed to read TLS certificate file: %w", err)
+	}
+
+	keyData, err := os.ReadFile(pathTLSKeyFile)
+	if err != nil {
+		return fmt.Errorf("Error: Failed to read TLS key file: %w", err)
+	}
+
+	selfSignedTLSCertificate = certData
+	selfSignedTLSKey = keyData
+
+	return nil
+}