feat: persistent TLS cert and token auto-generation during install

cmd/server/service.go

@@ -21,8 +21,8 @@ const defaultConfigTemplate = `# Nadir configuration - config.yaml
 server:
   secure_tls: true
   # trust_proxy: false
-  # tls_cert: /etc/nadir/tls/cert.pem
-  # tls_key:  /etc/nadir/tls/key.pem
+  tls_cert: /var/lib/nadir/tls/cert.pem
+  tls_key:  /var/lib/nadir/tls/key.pem
   hostname: 127.0.0.1
   port: 9999
   release_repo: https://tea.urania.dev/urania/nadir-agent
@@ -30,9 +30,12 @@ server:
 roles:
   admin:
     "*": ["*"]
+  auditor:
+    "*": ["read"]
 
 assignments:
   %s: [admin]
+  dashboard: [auditor]
 `
 
 // resolveConfigPath returns the config file path: CONFIG_PATH env (with ~ expanded)
@@ -130,6 +133,20 @@ func installService() error {
 		return fmt.Errorf("create data directory: %w", err)
 	}
 
+	// Generate and save persistent self-signed TLS certificates
+	tlsDir := "/var/lib/nadir/tls"
+	if err := os.MkdirAll(tlsDir, 0700); err != nil {
+		return fmt.Errorf("create tls directory: %w", err)
+	}
+	certPath := filepath.Join(tlsDir, "cert.pem")
+	keyPath := filepath.Join(tlsDir, "key.pem")
+	if _, err := os.Stat(certPath); os.IsNotExist(err) {
+		if err := generateAndSaveCert(certPath, keyPath); err != nil {
+			return fmt.Errorf("generate certificates: %w", err)
+		}
+		fmt.Printf("generated persistent self-signed TLS certificate at %s\n", certPath)
+	}
+
 	cfgPath, err := resolveConfigPath()
 	if err != nil {
 		return err
@@ -182,6 +199,42 @@ WantedBy=multi-user.target
 		fmt.Printf("created logrotate configuration %s\n", logrotatePath)
 	}
 
+	// Generate a token for the dashboard if it doesn't exist
+	var tokenStr string
+	store, err := auth.NewTokenStore(tokenDBPath)
+	if err == nil {
+		defer store.Close()
+		infos, err := store.List()
+		hasDashboard := false
+		if err == nil {
+			for _, t := range infos {
+				if t.Name == "dashboard" {
+					hasDashboard = true
+					break
+				}
+			}
+		}
+		if !hasDashboard {
+			tokenStr, _ = store.Create("dashboard")
+		} else {
+			tokenStr = "(already created; run 'nadir token add dashboard' to replace/generate a new one if lost)"
+		}
+	} else {
+		fmt.Printf("warning: failed to open token store: %v\n", err)
+	}
+
+	// Output credentials to copy to the frontend
+	certBytes, err := os.ReadFile(filepath.Join("/var/lib/nadir/tls", "cert.pem"))
+	if err == nil {
+		fmt.Println("\n======================================================================")
+		fmt.Println("  NADIR CLIENT CREDENTIALS (COPY THESE TO SVELTEKIT FRONTEND)")
+		fmt.Println("======================================================================")
+		fmt.Printf("Token for \"dashboard\" (Bearer):\n  %s\n\n", tokenStr)
+		fmt.Println("CA Certificate (Trust Store):")
+		fmt.Println(string(certBytes))
+		fmt.Println("======================================================================")
+	}
+
 	fmt.Printf("installed and started %s; follow logs with: %s logs\n", serviceName, filepath.Base(exe))
 	return nil
 }

cmd/server/tls.go

@@ -7,9 +7,11 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"crypto/x509/pkix"
+	"encoding/pem"
 	"log"
 	"math/big"
 	"net"
+	"os"
 	"time"
 )
 
@@ -55,3 +57,69 @@ func generateSelfSignedCert() (tls.Certificate, error) {
 	}
 	return tls.Certificate{Certificate: [][]byte{derBytes}, PrivateKey: priv}, nil
 }
+
+// generateAndSaveCert generates a self-signed certificate and private key,
+// and saves them as PEM files.
+func generateAndSaveCert(certPath, keyPath string) error {
+	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		return err
+	}
+
+	serial, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
+	if err != nil {
+		return err
+	}
+
+	template := x509.Certificate{
+		SerialNumber:          serial,
+		Subject:               pkix.Name{Organization: []string{"nadir-agent-tls"}},
+		NotBefore:             time.Now(),
+		NotAfter:              time.Now().Add(3650 * 24 * time.Hour), // 10 years
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+		DNSNames:              []string{"localhost"},
+		IPAddresses:           []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback},
+	}
+
+	// Automatically add the machine's external IP addresses to SANs so it can be verified
+	// correctly over the local network (e.g. Tailscale or Netbird).
+	if addrs, err := net.InterfaceAddrs(); err == nil {
+		for _, a := range addrs {
+			if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+				template.IPAddresses = append(template.IPAddresses, ipnet.IP)
+				template.DNSNames = append(template.DNSNames, ipnet.IP.String())
+			}
+		}
+	}
+
+	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
+	if err != nil {
+		return err
+	}
+
+	certOut, err := os.Create(certPath)
+	if err != nil {
+		return err
+	}
+	defer certOut.Close()
+	if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
+		return err
+	}
+
+	keyOut, err := os.OpenFile(keyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return err
+	}
+	defer keyOut.Close()
+	privBytes, err := x509.MarshalECPrivateKey(priv)
+	if err != nil {
+		return err
+	}
+	if err := pem.Encode(keyOut, &pem.Block{Type: "EC PRIVATE KEY", Bytes: privBytes}); err != nil {
+		return err
+	}
+
+	return nil
+}