constellation/activation/server/server.go
Daniel Weiße f9a581f329 Add aTLS endpoint to KMS (#236)
* Move file watcher and validator to internal

* Add aTLS endpoint to KMS for Kubernetes external requests

* Update Go version in Dockerfiles

* Move most KMS packages to internal

Signed-off-by: Daniel Weiße <dw@edgeless.systems>
2022-06-29 16:13:01 +02:00

186 lines
6.9 KiB
Go

package server
import (
"context"
"fmt"
"net"
"path/filepath"
"time"
proto "github.com/edgelesssys/constellation/activation/activationproto"
attestationtypes "github.com/edgelesssys/constellation/internal/attestation/types"
"github.com/edgelesssys/constellation/internal/constants"
"github.com/edgelesssys/constellation/internal/file"
"github.com/edgelesssys/constellation/internal/grpc/grpclog"
"github.com/edgelesssys/constellation/internal/logger"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/status"
kubeadmv1 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
)
// Server implements the core logic of Constellation's node activation service.
type Server struct {
log *logger.Logger
file file.Handler
joinTokenGetter joinTokenGetter
dataKeyGetter dataKeyGetter
ca certificateAuthority
proto.UnimplementedAPIServer
}
// New initializes a new Server.
func New(log *logger.Logger, fileHandler file.Handler, ca certificateAuthority, joinTokenGetter joinTokenGetter, dataKeyGetter dataKeyGetter) *Server {
return &Server{
log: log,
file: fileHandler,
joinTokenGetter: joinTokenGetter,
dataKeyGetter: dataKeyGetter,
ca: ca,
}
}
// Run starts the gRPC server on the given port, using the provided tlsConfig.
func (s *Server) Run(creds credentials.TransportCredentials, port string) error {
s.log.WithIncreasedLevel(zap.WarnLevel).Named("gRPC").ReplaceGRPCLogger()
grpcServer := grpc.NewServer(
grpc.Creds(creds),
s.log.Named("gRPC").GetServerUnaryInterceptor(),
)
proto.RegisterAPIServer(grpcServer, s)
lis, err := net.Listen("tcp", net.JoinHostPort("", port))
if err != nil {
return fmt.Errorf("failed to listen: %s", err)
}
s.log.Infof("Starting activation service on %s", lis.Addr().String())
return grpcServer.Serve(lis)
}
// ActivateWorkerNode handles activation requests of Constellation worker nodes.
// A worker node will receive:
// - stateful disk encryption key.
// - Kubernetes join token.
// - cluster and owner ID to taint the node as initialized.
func (s *Server) ActivateWorkerNode(ctx context.Context, req *proto.ActivateWorkerNodeRequest) (*proto.ActivateWorkerNodeResponse, error) {
s.log.Infof("ActivateWorkerNode called")
nodeParameters, err := s.activateNode(ctx, req.DiskUuid, req.NodeName)
if err != nil {
return nil, fmt.Errorf("ActivateWorkerNode failed: %w", err)
}
s.log.Infof("ActivateWorkerNode successful")
return &proto.ActivateWorkerNodeResponse{
StateDiskKey: nodeParameters.stateDiskKey,
ClusterId: nodeParameters.id.Cluster,
OwnerId: nodeParameters.id.Owner,
ApiServerEndpoint: nodeParameters.kubeArgs.APIServerEndpoint,
Token: nodeParameters.kubeArgs.Token,
DiscoveryTokenCaCertHash: nodeParameters.kubeArgs.CACertHashes[0],
KubeletCert: nodeParameters.kubeletCert,
KubeletKey: nodeParameters.kubeletKey,
}, nil
}
// ActivateControlPlaneNode handles activation requests of Constellation control-plane nodes.
// A control-plane node will receive:
// - stateful disk encryption key.
// - Kubernetes join token.
// - cluster and owner ID to taint the node as initialized.
// - a decryption key for CA certificates uploaded to the Kubernetes cluster.
func (s *Server) ActivateControlPlaneNode(ctx context.Context, req *proto.ActivateControlPlaneNodeRequest) (*proto.ActivateControlPlaneNodeResponse, error) {
s.log.Infof("ActivateControlPlaneNode called")
nodeParameters, err := s.activateNode(ctx, req.DiskUuid, req.NodeName)
if err != nil {
return nil, fmt.Errorf("ActivateControlPlaneNode failed: %w", err)
}
certKey, err := s.joinTokenGetter.GetControlPlaneCertificateKey()
if err != nil {
return nil, fmt.Errorf("ActivateControlPlane failed: %w", err)
}
s.log.Infof("ActivateControlPlaneNode successful")
return &proto.ActivateControlPlaneNodeResponse{
StateDiskKey: nodeParameters.stateDiskKey,
ClusterId: nodeParameters.id.Cluster,
OwnerId: nodeParameters.id.Owner,
ApiServerEndpoint: nodeParameters.kubeArgs.APIServerEndpoint,
Token: nodeParameters.kubeArgs.Token,
DiscoveryTokenCaCertHash: nodeParameters.kubeArgs.CACertHashes[0],
KubeletCert: nodeParameters.kubeletCert,
KubeletKey: nodeParameters.kubeletKey,
CertificateKey: certKey,
}, nil
}
func (s *Server) activateNode(ctx context.Context, diskUUID, nodeName string) (nodeParameters, error) {
log := s.log.With(zap.String("peerAddress", grpclog.PeerAddrFromContext(ctx)))
log.Infof("Loading IDs")
var id attestationtypes.ID
if err := s.file.ReadJSON(filepath.Join(constants.ServiceBasePath, constants.IDFilename), &id); err != nil {
log.With(zap.Error(err)).Errorf("Unable to load IDs")
return nodeParameters{}, status.Errorf(codes.Internal, "unable to load IDs: %s", err)
}
log.Infof("Requesting disk encryption key")
stateDiskKey, err := s.dataKeyGetter.GetDataKey(ctx, diskUUID, constants.StateDiskKeyLength)
if err != nil {
log.With(zap.Error(err)).Errorf("Unable to get key for stateful disk")
return nodeParameters{}, status.Errorf(codes.Internal, "unable to get key for stateful disk: %s", err)
}
log.Infof("Creating Kubernetes join token")
kubeArgs, err := s.joinTokenGetter.GetJoinToken(constants.KubernetesJoinTokenTTL)
if err != nil {
log.With(zap.Error(err)).Errorf("Unable to generate Kubernetes join arguments")
return nodeParameters{}, status.Errorf(codes.Internal, "unable to generate Kubernetes join arguments: %s", err)
}
log.Infof("Creating signed kubelet certificate")
kubeletCert, kubeletKey, err := s.ca.GetCertificate(nodeName)
if err != nil {
return nodeParameters{}, status.Errorf(codes.Internal, "unable to generate kubelet certificate: %s", err)
}
return nodeParameters{
stateDiskKey: stateDiskKey,
id: id,
kubeArgs: kubeArgs,
kubeletCert: kubeletCert,
kubeletKey: kubeletKey,
}, nil
}
type nodeParameters struct {
stateDiskKey []byte
id attestationtypes.ID
kubeArgs *kubeadmv1.BootstrapTokenDiscovery
kubeletCert []byte
kubeletKey []byte
}
// joinTokenGetter returns Kubernetes bootstrap (join) tokens.
type joinTokenGetter interface {
// GetJoinToken returns a bootstrap (join) token.
GetJoinToken(ttl time.Duration) (*kubeadmv1.BootstrapTokenDiscovery, error)
GetControlPlaneCertificateKey() (string, error)
}
// dataKeyGetter interacts with Constellation's key management system to retrieve keys.
type dataKeyGetter interface {
// GetDataKey returns a key derived from Constellation's KMS.
GetDataKey(ctx context.Context, uuid string, length int) ([]byte, error)
}
type certificateAuthority interface {
// GetCertificate returns a certificate and private key, signed by the issuer.
GetCertificate(nodeName string) (kubeletCert []byte, kubeletKey []byte, err error)
}