constellation/kms/internal/server/server.go

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// Package server implements an API to manage encryption keys.
package server
import (
"context"
"fmt"
"net"
"github.com/edgelesssys/constellation/internal/crypto"
"github.com/edgelesssys/constellation/internal/grpc/grpclog"
"github.com/edgelesssys/constellation/internal/logger"
"github.com/edgelesssys/constellation/kms/kms"
"github.com/edgelesssys/constellation/kms/kmsproto"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// Server implements an encryption key management server.
// The server serves aTLS for cluster external requests
// and plain gRPC for cluster internal requests.
type Server struct {
log *logger.Logger
conKMS kms.CloudKMS
kmsproto.UnimplementedAPIServer
}
// New creates a new Server.
func New(log *logger.Logger, conKMS kms.CloudKMS) *Server {
return &Server{
log: log,
conKMS: conKMS,
}
}
// Run starts the gRPC server.
func (s *Server) Run(port string) error {
// set up listener
listener, err := net.Listen("tcp", net.JoinHostPort("", port))
if err != nil {
return fmt.Errorf("failed to listen on port %s: %v", port, err)
}
server := grpc.NewServer(s.log.Named("gRPC").GetServerUnaryInterceptor())
kmsproto.RegisterAPIServer(server, s)
s.log.Named("gRPC").WithIncreasedLevel(zapcore.WarnLevel).ReplaceGRPCLogger()
// start the server
s.log.Infof("Starting Constellation key management service on %s", listener.Addr().String())
return server.Serve(listener)
}
// GetDataKey returns a data key.
func (s *Server) GetDataKey(ctx context.Context, in *kmsproto.GetDataKeyRequest) (*kmsproto.GetDataKeyResponse, error) {
log := s.log.With("peerAddress", grpclog.PeerAddrFromContext(ctx))
// Error on 0 key length
if in.Length == 0 {
log.Errorf("Requested key length is zero")
return nil, status.Error(codes.InvalidArgument, "can't derive key with length zero")
}
// Error on empty DataKeyId
if in.DataKeyId == "" {
log.Errorf("No data key ID specified")
return nil, status.Error(codes.InvalidArgument, "no data key ID specified")
}
key, err := s.conKMS.GetDEK(ctx, "Constellation", crypto.HKDFInfoPrefix+in.DataKeyId, int(in.Length))
if err != nil {
log.With(zap.Error(err)).Errorf("Failed to get data key")
return nil, status.Errorf(codes.Internal, "%v", err)
}
return &kmsproto.GetDataKeyResponse{DataKey: key}, nil
}