yats.git

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/**
 * Yats - yats
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Paolo Lulli <kevwe.com>
 * @copyright Paolo Lulli 2024
 */

package grpc

import (
	"crypto/tls"
	"crypto/x509"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
	"log"
	"net"
	"os"
	"yats-server/config"
	"yats-server/proto"
)

type server struct {
	proto.UnimplementedYatsGrpcServiceServer
}

func RunUnsecureYatsGrpcServer(address string) {
	lis, err := net.Listen("tcp", address)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer()
	proto.RegisterYatsGrpcServiceServer(s, &server{})
	log.Printf("Server is running on port %s\n", address)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

func NOCARunSecureYatsGrpcServer(conf config.Configuration) {

	cert, err := tls.LoadX509KeyPair(conf.TlsCertificate, conf.TlsKeyFile)

	if err != nil {
		log.Fatal(err)
	}
	opts := []grpc.ServerOption{
		grpc.Creds(credentials.NewServerTLSFromCert(&cert)),
	}

	lis, err := net.Listen("tcp", conf.GrpcAddress)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}

	s := grpc.NewServer(opts...)

	proto.RegisterYatsGrpcServiceServer(s, &server{})
	log.Printf("Server is running on port %s\n", conf.GrpcAddress)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

func RunSecureYatsGrpcServer(conf config.Configuration) {
	caPem, err := os.ReadFile(conf.TlsCA)
	if err != nil {
		log.Fatal(err)
	}

	certPool := x509.NewCertPool()
	if !certPool.AppendCertsFromPEM(caPem) {
		log.Fatal(err)
	}

	serverCert, err := tls.LoadX509KeyPair(conf.TlsCertificate, conf.TlsKeyFile)
	if err != nil {
		log.Fatal(err)
	}

	tlsconf := &tls.Config{
		Certificates: []tls.Certificate{serverCert},
		ClientAuth:   tls.RequireAndVerifyClientCert,
		ClientCAs:    certPool,
	}

	lis, err := net.Listen("tcp", conf.GrpcAddress)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}

	tlsCredentials := credentials.NewTLS(tlsconf)

	s := grpc.NewServer(grpc.Creds(tlsCredentials))

	proto.RegisterYatsGrpcServiceServer(s, &server{})
	log.Printf("Server is running on port %s\n", conf.GrpcAddress)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}