2026-04-29

internal/pkg/configure/tls.go

@@ -0,0 +1,118 @@
+package configure
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	"math/big"
+	"net"
+	"os"
+	"path"
+	"time"
+
+	sunhpcconf "gitea.sunhpc.com/kelvin/sunhpc/internal/pkg/config"
+	"gitea.sunhpc.com/kelvin/sunhpc/internal/pkg/util"
+	"gitea.sunhpc.com/kelvin/sunhpc/internal/pkg/splog"
+)
+
+// TLS ensures TLS keys exist if TLS is enabled.
+// If force is true, regenerates even if keys already exist.
+// Returns true if new keys were generated.
+func TLS(force bool) (bool, error) {
+	conf := sunhpcconf.Get()
+	if !conf.Sunhpc.TLSEnabled() {
+		return false, nil
+	}
+
+	keystore := path.Join(conf.Paths.Sysconfdir, "sunhpc", "tls")
+	keyFile := path.Join(keystore, "sunhpc.key")
+	certFile := path.Join(keystore, "sunhpc.crt")
+
+	if !force && util.IsFile(keyFile) && util.IsFile(certFile) {
+		splog.Info("TLS keys already exist in %s", keystore)
+		return false, nil
+	}
+
+	if err := GenTLSKeys(); err != nil {
+		return false, err
+	}
+	splog.Info("TLS keys generated in %s", keystore)
+	return true, nil
+}
+
+// GenTLSKeys generates new TLS keys and certificate unconditionally.
+func GenTLSKeys() error {
+	conf := sunhpcconf.Get()
+	keystore := path.Join(conf.Paths.Sysconfdir, "sunhpc", "tls")
+
+	if err := os.MkdirAll(keystore, 0755); err != nil {
+		return fmt.Errorf("could not create keystore directory: %w", err)
+	}
+
+	keyFile := path.Join(keystore, "sunhpc.key")
+	certFile := path.Join(keystore, "sunhpc.crt")
+	splog.Verbose("Generating new x509 keys in %s", keystore)
+	priv, err := rsa.GenerateKey(rand.Reader, 4096)
+	if err != nil {
+		return fmt.Errorf("failed to generate rsa key: %w", err)
+	}
+
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
+	if err != nil {
+		return fmt.Errorf("failed to generate serial number: %w", err)
+	}
+
+	template := x509.Certificate{
+		SerialNumber: serialNumber,
+		Subject: pkix.Name{
+			CommonName:   "Sunhpc Server",
+			Organization: []string{"Sunhpc"},
+		},
+		NotBefore: time.Now(),
+		NotAfter:  time.Now().Add(time.Hour * 24 * 365 * 10),
+
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+	}
+
+	if ip := net.ParseIP(conf.Ipaddr); ip != nil {
+		template.IPAddresses = append(template.IPAddresses, ip)
+	}
+	if ip := net.ParseIP(conf.Ipaddr6); ip != nil {
+		template.IPAddresses = append(template.IPAddresses, ip)
+	}
+	if conf.Fqdn != "" {
+		template.DNSNames = append(template.DNSNames, conf.Fqdn)
+	}
+	template.DNSNames = append(template.DNSNames, "sunhpc")
+
+	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
+	if err != nil {
+		return fmt.Errorf("failed to create certificate: %w", err)
+	}
+
+	keyOut, err := os.OpenFile(keyFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return fmt.Errorf("failed to open key file for writing: %w", err)
+	}
+	defer func() { _ = keyOut.Close() }()
+	if err := pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}); err != nil {
+		return fmt.Errorf("failed to write data to key file: %w", err)
+	}
+
+	certOut, err := os.OpenFile(certFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to open cert file for writing: %w", err)
+	}
+	defer func() { _ = certOut.Close() }()
+	if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
+		return fmt.Errorf("failed to write data to cert file: %w", err)
+	}
+
+	return nil
+}