Add TLS support for Trillian server

Signed-off-by: Firas Ghanmi <fghanmi@redhat.com>

cmd/rekor-server/app/root.go

@@ -117,6 +117,8 @@ Memory and file-based signers should only be used for testing.`)
 	rootCmd.PersistentFlags().String("redis_server.password", "", "Redis server password")
 	rootCmd.PersistentFlags().Bool("redis_server.enable-tls", false, "Whether to enable TLS verification when connecting to Redis endpoint")
 	rootCmd.PersistentFlags().Bool("redis_server.insecure-skip-verify", false, "Whether to skip TLS verification when connecting to Redis endpoint, only applicable when 'redis_server.enable-tls' is set to 'true'")
+	rootCmd.PersistentFlags().String("tls_ca_cert", "", "Certificate file to use for secure connections with Trillian server")
+	rootCmd.PersistentFlags().Bool("trillian_log_server.tls", false, "Use TLS when connecting to Trillian")
 
 	rootCmd.PersistentFlags().Bool("enable_attestation_storage", false, "enables rich attestation storage")
 	rootCmd.PersistentFlags().String("attestation_storage_bucket", "", "url for attestation storage bucket")

docker-compose.yml

@@ -58,7 +58,11 @@ services:
       "--rpc_endpoint=0.0.0.0:8090",
       "--http_endpoint=0.0.0.0:8091",
       "--alsologtostderr",
+      "--tls_cert_file=/tests/tls/tls.crt",
+      "--tls_key_file=/tests/tls/tls.key"
     ]
+    volumes:
+      - "./tests/tls:/tests/tls:z"
     restart: always # retry while mysql is starting up
     ports:
       - "8090:8090"
@@ -102,11 +106,13 @@ services:
       "--enable_stable_checkpoint",
       "--search_index.storage_provider=mysql",
       "--search_index.mysql.dsn=test:zaphod@tcp(mysql:3306)/test",
+      "--tls_ca_cert=/tests/tls/ca.crt"
       # Uncomment this for production logging
       # "--log_type=prod",
       ]
     volumes:
     - "/var/run/attestations:/var/run/attestations:z"
+    - "./tests/tls:/tests/tls:z"
     restart: always # keep the server running
     ports:
       - "3000:3000"

pkg/api/api.go

@@ -22,12 +22,15 @@ import (
 	"crypto/x509"
 	"encoding/hex"
 	"fmt"
+	"os"
+	"path/filepath"
 
 	"github.com/google/trillian"
 	"github.com/redis/go-redis/v9"
 	"github.com/spf13/viper"
 	"golang.org/x/exp/slices"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/credentials/insecure"
 
 	"github.com/sigstore/rekor/pkg/indexstorage"
@@ -47,7 +50,33 @@ import (
 
 func dial(rpcServer string) (*grpc.ClientConn, error) {
 	// Set up and test connection to rpc server
-	creds := insecure.NewCredentials()
+	var creds credentials.TransportCredentials
+	tlsCACertFile := viper.GetString("tls_ca_cert")
+	useSystemTrustStore := viper.GetBool("trillian_log_server.tls")
+
+	switch {
+	case useSystemTrustStore:
+		creds = credentials.NewTLS(&tls.Config{
+			ServerName: rpcServer,
+			MinVersion: tls.VersionTLS12,
+		})
+	case tlsCACertFile == "":
+		creds = insecure.NewCredentials()
+	default:
+		tlsCaCert, err := os.ReadFile(filepath.Clean(tlsCACertFile))
+		if err != nil {
+			log.Logger.Fatalf("Failed to load tls_ca_cert:", err)
+		}
+		certPool := x509.NewCertPool()
+		if !certPool.AppendCertsFromPEM(tlsCaCert) {
+			return nil, fmt.Errorf("failed to append CA certificate to pool")
+		}
+		creds = credentials.NewTLS(&tls.Config{
+			ServerName: rpcServer,
+			RootCAs:    certPool,
+			MinVersion: tls.VersionTLS12,
+		})
+	}
 	conn, err := grpc.NewClient(rpcServer, grpc.WithTransportCredentials(creds))
 	if err != nil {
 		log.Logger.Fatalf("Failed to connect to RPC server:", err)

tests/tls/ca.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIFAzCCAuugAwIBAgIUHuxfcTh3qTOQMRYyg4mU1igOpsYwDQYJKoZIhvcNAQEL
+BQAwEDEOMAwGA1UEAwwFTXkgQ0EwIBcNMjQwNzAyMjIyNjA0WhgPMjEyNDA2MDgy
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+-----END CERTIFICATE-----

tests/tls/tls.crt

@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
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+jtPijI5dTcAUE6TSlA==
+-----END CERTIFICATE-----

tests/tls/tls.key

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----