pluggable secret backend

This commit extends SwarmKit secret management with pluggable secret
backends support.

Updating the work in
[swarmkit](docker/swarmkit@eebac27434d34708fac993f9f5181d106c5c2fae) for
pluggable secret backend and adding the
driver parameter to `SecretSpec`.

Remaining work:
- [ ] CLI support (docker/cli)
- [ ] api in [plugin helpers](docker/go-plugins-helpers))
- [ ] Reference plugin
- [ ] Documenation (after cli work)

Signed-off-by: Liron Levin <liron@twistlock.com>

api/types/swarm/secret.go

@@ -12,7 +12,8 @@ type Secret struct {
 // SecretSpec represents a secret specification from a secret in swarm
 type SecretSpec struct {
 	Annotations
-	Data []byte `json:",omitempty"`
+	Data   []byte  `json:",omitempty"`
+	Driver *Driver `json:"omitempty"` // name of the secrets driver used to fetch the secret's value from an external secret store
 }
 
 // SecretReferenceFileTarget is a file target in a secret reference

daemon/cluster/convert/secret.go

@@ -13,6 +13,7 @@ func SecretFromGRPC(s *swarmapi.Secret) swarmtypes.Secret {
 		Spec: swarmtypes.SecretSpec{
 			Annotations: annotationsFromGRPC(s.Spec.Annotations),
 			Data:        s.Spec.Data,
+			Driver:      driverFromGRPC(s.Spec.Driver),
 		},
 	}
 
@@ -31,7 +32,8 @@ func SecretSpecToGRPC(s swarmtypes.SecretSpec) swarmapi.SecretSpec {
 			Name:   s.Name,
 			Labels: s.Labels,
 		},
-		Data: s.Data,
+		Data:   s.Data,
+		Driver: driverToGRPC(s.Driver),
 	}
 }
 

vendor.conf

@@ -106,7 +106,7 @@ github.com/stevvooe/continuity cd7a8e21e2b6f84799f5dd4b65faf49c8d3ee02d
 github.com/tonistiigi/fsutil 0ac4c11b053b9c5c7c47558f81f96c7100ce50fb
 
 # cluster
-github.com/docker/swarmkit a3d96fe13e30e46c3d4cfc3f316ebdd8446a079d
+github.com/docker/swarmkit 3e2dd3c0a76149b1620b42d28dd6ff48270404e5
 github.com/gogo/protobuf v0.4
 github.com/cloudflare/cfssl 7fb22c8cba7ecaf98e4082d22d65800cf45e042a
 github.com/google/certificate-transparency d90e65c3a07988180c5b1ece71791c0b6506826e

vendor/github.com/docker/swarmkit/api/specs.pb.go

@@ -766,6 +766,8 @@ type SecretSpec struct {
 	// The currently recognized values are:
 	// - golang: Go templating
 	Templating *Driver `protobuf:"bytes,3,opt,name=templating" json:"templating,omitempty"`
+	// Driver is the the secret driver that is used to store the specified secret
+	Driver *Driver `protobuf:"bytes,4,opt,name=driver" json:"driver,omitempty"`
 }
 
 func (m *SecretSpec) Reset()                    { *m = SecretSpec{} }
@@ -1240,6 +1242,10 @@ func (m *SecretSpec) CopyFrom(src interface{}) {
 		m.Templating = &Driver{}
 		github_com_docker_swarmkit_api_deepcopy.Copy(m.Templating, o.Templating)
 	}
+	if o.Driver != nil {
+		m.Driver = &Driver{}
+		github_com_docker_swarmkit_api_deepcopy.Copy(m.Driver, o.Driver)
+	}
 }
 
 func (m *ConfigSpec) Copy() *ConfigSpec {
@@ -2257,6 +2263,16 @@ func (m *SecretSpec) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += n37
 	}
+	if m.Driver != nil {
+		dAtA[i] = 0x22
+		i++
+		i = encodeVarintSpecs(dAtA, i, uint64(m.Driver.Size()))
+		n38, err := m.Driver.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n38
+	}
 	return i, nil
 }
 
@@ -2278,11 +2294,11 @@ func (m *ConfigSpec) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintSpecs(dAtA, i, uint64(m.Annotations.Size()))
-	n38, err := m.Annotations.MarshalTo(dAtA[i:])
+	n39, err := m.Annotations.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n38
+	i += n39
 	if len(m.Data) > 0 {
 		dAtA[i] = 0x12
 		i++
@@ -2293,11 +2309,11 @@ func (m *ConfigSpec) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x1a
 		i++
 		i = encodeVarintSpecs(dAtA, i, uint64(m.Templating.Size()))
-		n39, err := m.Templating.MarshalTo(dAtA[i:])
+		n40, err := m.Templating.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n39
+		i += n40
 	}
 	return i, nil
 }
@@ -2729,6 +2745,10 @@ func (m *SecretSpec) Size() (n int) {
 		l = m.Templating.Size()
 		n += 1 + l + sovSpecs(uint64(l))
 	}
+	if m.Driver != nil {
+		l = m.Driver.Size()
+		n += 1 + l + sovSpecs(uint64(l))
+	}
 	return n
 }
 
@@ -3022,6 +3042,7 @@ func (this *SecretSpec) String() string {
 		`Annotations:` + strings.Replace(strings.Replace(this.Annotations.String(), "Annotations", "Annotations", 1), `&`, ``, 1) + `,`,
 		`Data:` + fmt.Sprintf("%v", this.Data) + `,`,
 		`Templating:` + strings.Replace(fmt.Sprintf("%v", this.Templating), "Driver", "Driver", 1) + `,`,
+		`Driver:` + strings.Replace(fmt.Sprintf("%v", this.Driver), "Driver", "Driver", 1) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -5883,6 +5904,39 @@ func (m *SecretSpec) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Driver", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowSpecs
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthSpecs
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Driver == nil {
+				m.Driver = &Driver{}
+			}
+			if err := m.Driver.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipSpecs(dAtA[iNdEx:])
@@ -6156,122 +6210,123 @@ var (
 func init() { proto.RegisterFile("specs.proto", fileDescriptorSpecs) }
 
 var fileDescriptorSpecs = []byte{
-	// 1867 bytes of a gzipped FileDescriptorProto
+	// 1880 bytes of a gzipped FileDescriptorProto
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+	0xc1, 0xd2, 0xba, 0x08, 0xbd, 0x21, 0x23, 0xbe, 0x7d, 0x47, 0xc7, 0x03, 0x94, 0xe9, 0x58, 0x5b,
+	0xd4, 0x39, 0xc4, 0xd1, 0x08, 0xed, 0xbb, 0xd7, 0x9f, 0x83, 0x59, 0xec, 0xfc, 0x1c, 0x0c, 0x07,
+	0xfd, 0x02, 0x20, 0x10, 0xde, 0xc4, 0xf3, 0xe9, 0x90, 0x86, 0xf6, 0x3d, 0xbd, 0xe9, 0x7a, 0xe6,
+	0x6b, 0x3d, 0x43, 0xe1, 0x14, 0xa3, 0xf6, 0x39, 0x58, 0xa9, 0xdb, 0xa6, 0x6e, 0xc9, 0x39, 0x9d,
+	0x9a, 0x0b, 0xac, 0x9a, 0x2a, 0x24, 0x13, 0xe2, 0x47, 0x71, 0x25, 0x5c, 0xc6, 0x71, 0xe7, 0x8b,
+	0xe5, 0xc7, 0xb9, 0xda, 0x0e, 0x58, 0x29, 0xd5, 0xa1, 0x8f, 0x61, 0x4d, 0xd0, 0xa1, 0x17, 0x4a,
+	0x31, 0x1d, 0x90, 0x48, 0x8e, 0xec, 0x5f, 0x69, 0x42, 0x25, 0x31, 0xb6, 0x23, 0x39, 0xaa, 0x0d,
+	0x60, 0x7e, 0x78, 0xa8, 0x01, 0x96, 0x12, 0x45, 0x48, 0xc5, 0x84, 0x0a, 0x95, 0x6d, 0x55, 0xcc,
+	0xd3, 0x26, 0x25, 0xde, 0x90, 0x12, 0xe1, 0x8c, 0xf4, 0xdb, 0x51, 0xc6, 0xa6, 0xa7, 0x1e, 0x83,
+	0xe4, 0x86, 0x98, 0xc7, 0xc0, 0x74, 0x9b, 0xff, 0xce, 0x41, 0x25, 0x5d, 0x34, 0xa0, 0xdd, 0x38,
+	0xd9, 0xeb, 0x2d, 0xdd, 0xda, 0xd9, 0xbe, 0xa9, 0xc8, 0xd0, 0xa9, 0xd5, 0x8f, 0x94, 0xb3, 0x43,
+	0x55, 0xdf, 0x6b, 0x32, 0xfa, 0x29, 0xac, 0x06, 0x5c, 0xc8, 0xe4, 0x09, 0xcb, 0x0e, 0x30, 0x17,
+	0x49, 0x2a, 0x8a, 0xc1, 0xcd, 0x11, 0xdc, 0x5a, 0xf4, 0x86, 0x1e, 0xc2, 0xca, 0xf3, 0xfd, 0x7e,
+	0x75, 0xa9, 0x76, 0xff, 0xe5, 0x45, 0xe3, 0xbb, 0x8b, 0x83, 0xcf, 0x3d, 0x21, 0x23, 0xe2, 0xef,
+	0xf7, 0xd1, 0x0f, 0x61, 0xb5, 0x7b, 0x74, 0x8c, 0x71, 0x35, 0x57, 0xdb, 0x7c, 0x79, 0xd1, 0xb8,
+	0xbf, 0x88, 0x53, 0x43, 0x3c, 0x62, 0x2e, 0xe6, 0xa7, 0xb3, 0x5a, 0xf7, 0x3f, 0xcb, 0x60, 0x99,
+	0x97, 0xfd, 0x43, 0x7f, 0x87, 0xd6, 0xe2, 0x54, 0x9e, 0x5c, 0xd9, 0xe5, 0x1b, 0x33, 0x7a, 0x25,
+	0x26, 0x98, 0x33, 0x7e, 0x00, 0x15, 0x2f, 0x98, 0x7c, 0x36, 0xa0, 0x8c, 0x9c, 0xfa, 0xa6, 0xec,
+	0x2d, 0x61, 0x4b, 0xd9, 0x7a, 0xb1, 0x49, 0xbd, 0x17, 0x1e, 0x93, 0x54, 0x30, 0x53, 0xd0, 0x96,
+	0xf0, 0xac, 0x8f, 0xbe, 0x84, 0xbc, 0x17, 0x90, 0xb1, 0x29, 0x43, 0x32, 0x77, 0xb0, 0xdf, 0x6f,
+	0x1f, 0x1a, 0x0d, 0x76, 0x4a, 0x57, 0x97, 0x9b, 0x79, 0x65, 0xc0, 0x9a, 0x86, 0xea, 0x49, 0x25,
+	0xa0, 0x66, 0xd2, 0x6f, 0x7f, 0x09, 0xa7, 0x2c, 0x4a, 0x47, 0x1e, 0x1b, 0x0a, 0x1a, 0x86, 0x3a,
+	0x0b, 0x94, 0x70, 0xd2, 0x45, 0x35, 0x28, 0x9a, 0x7a, 0x42, 0x17, 0x10, 0x65, 0x95, 0xab, 0x8d,
+	0xa1, 0xb3, 0x06, 0x56, 0x1c, 0x8d, 0xc1, 0x99, 0xe0, 0xe3, 0xe6, 0x7f, 0xf3, 0x60, 0xed, 0xfa,
+	0x51, 0x28, 0x4d, 0x1a, 0xfc, 0x60, 0xc1, 0x7f, 0x01, 0xeb, 0x44, 0x7f, 0xaf, 0x08, 0x53, 0x39,
+	0x45, 0x97, 0x69, 0xe6, 0x00, 0x1e, 0x66, 0xba, 0x9b, 0x81, 0xe3, 0x92, 0xae, 0x53, 0x50, 0x3e,
+	0xed, 0x1c, 0xae, 0x92, 0x37, 0x46, 0xd0, 0x31, 0xac, 0x71, 0xe1, 0x8c, 0x68, 0x28, 0xe3, 0x4c,
+	0x64, 0xbe, 0x23, 0x99, 0x1f, 0xd5, 0x67, 0x69, 0xa0, 0x79, 0x86, 0xe3, 0xd5, 0x2e, 0xfa, 0x40,
+	0x8f, 0x21, 0x2f, 0xc8, 0x59, 0x52, 0x72, 0x66, 0x5e, 0x12, 0x4c, 0xce, 0xe4, 0x82, 0x0b, 0xcd,
+	0x40, 0xbf, 0x01, 0x70, 0xbd, 0x30, 0x20, 0xd2, 0x19, 0x51, 0x61, 0x0e, 0x3b, 0x73, 0x8b, 0xdd,
+	0x19, 0x6a, 0xc1, 0x4b, 0x8a, 0x8d, 0x0e, 0xa0, 0xec, 0x90, 0x44, 0xae, 0x85, 0xeb, 0xff, 0x68,
+	0xbb, 0x6d, 0xe3, 0xa2, 0xaa, 0x5c, 0x5c, 0x5d, 0x6e, 0x96, 0x12, 0x0b, 0x2e, 0x39, 0xc4, 0xc8,
+	0xf7, 0x00, 0xd6, 0xd4, 0xdf, 0x6d, 0xe0, 0xd2, 0x33, 0x12, 0xf9, 0x32, 0x96, 0xc9, 0x35, 0x69,
+	0x45, 0x7d, 0x04, 0xba, 0x06, 0x67, 0xd6, 0x55, 0x91, 0x29, 0x1b, 0xfa, 0x1d, 0xac, 0x53, 0xe6,
+	0x88, 0xa9, 0x16, 0x6b, 0xb2, 0xc2, 0xd2, 0xf5, 0x9b, 0xed, 0xcd, 0xc0, 0x0b, 0x9b, 0xad, 0xd2,
+	0x37, 0xec, 0xcd, 0x7f, 0xe6, 0x00, 0xe2, 0x4c, 0xfd, 0x61, 0x05, 0x88, 0x20, 0xef, 0x12, 0x49,
+	0xb4, 0xe6, 0x2a, 0x58, 0xb7, 0xd1, 0x17, 0x00, 0x92, 0x8e, 0x03, 0x9f, 0x48, 0x8f, 0x0d, 0x8d,
+	0x6c, 0xde, 0xf5, 0x1c, 0xa4, 0xd0, 0x68, 0x07, 0x0a, 0xe6, 0x63, 0x90, 0xbf, 0x91, 0x67, 0x90,
+	0xcd, 0xbf, 0xe6, 0x00, 0xe2, 0x6d, 0x7e, 0xab, 0xf7, 0xd6, 0xb1, 0x5f, 0xbd, 0xae, 0x2f, 0xfd,
+	0xe3, 0x75, 0x7d, 0xe9, 0x8f, 0x57, 0xf5, 0xdc, 0xab, 0xab, 0x7a, 0xee, 0x6f, 0x57, 0xf5, 0xdc,
+	0xbf, 0xae, 0xea, 0xb9, 0xd3, 0x82, 0xae, 0xfb, 0x7e, 0xf2, 0xbf, 0x00, 0x00, 0x00, 0xff, 0xff,
+	0xc1, 0xd8, 0x19, 0x9e, 0x30, 0x13, 0x00, 0x00,
 }

vendor/github.com/docker/swarmkit/api/specs.proto

@@ -393,6 +393,9 @@ message SecretSpec {
 	// The currently recognized values are:
 	// - golang: Go templating
 	Driver templating = 3;
+
+	// Driver is the the secret driver that is used to store the specified secret
+	Driver driver = 4;
 }
 
 // ConfigSpec specifies user-provided configuration files.

vendor/github.com/docker/swarmkit/api/validation/secrets.go

@@ -0,0 +1,14 @@
+package validation
+
+import "fmt"
+
+// MaxSecretSize is the maximum byte length of the `Secret.Spec.Data` field.
+const MaxSecretSize = 500 * 1024 // 500KB
+
+// ValidateSecretPayload validates the secret payload size
+func ValidateSecretPayload(data []byte) error {
+	if len(data) >= MaxSecretSize || len(data) < 1 {
+		return fmt.Errorf("secret data must be larger than 0 and less than %d bytes", MaxSecretSize)
+	}
+	return nil
+}

vendor/github.com/docker/swarmkit/manager/controlapi/secret.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/swarmkit/api"
+	"github.com/docker/swarmkit/api/validation"
 	"github.com/docker/swarmkit/identity"
 	"github.com/docker/swarmkit/log"
 	"github.com/docker/swarmkit/manager/state/store"
@@ -14,9 +15,6 @@ import (
 	"google.golang.org/grpc/codes"
 )
 
-// MaxSecretSize is the maximum byte length of the `Secret.Spec.Data` field.
-const MaxSecretSize = 500 * 1024 // 500KB
-
 // assumes spec is not nil
 func secretFromSecretSpec(spec *api.SecretSpec) *api.Secret {
 	return &api.Secret{
@@ -56,7 +54,6 @@ func (s *Server) UpdateSecret(ctx context.Context, request *api.UpdateSecretRequ
 	if request.SecretID == "" || request.SecretVersion == nil {
 		return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
 	}
-
 	var secret *api.Secret
 	err := s.store.Update(func(tx store.Tx) error {
 		secret = store.GetSecret(tx, request.SecretID)
@@ -245,9 +242,16 @@ func validateSecretSpec(spec *api.SecretSpec) error {
 	if err := validateConfigOrSecretAnnotations(spec.Annotations); err != nil {
 		return err
 	}
-
-	if len(spec.Data) >= MaxSecretSize || len(spec.Data) < 1 {
-		return grpc.Errorf(codes.InvalidArgument, "secret data must be larger than 0 and less than %d bytes", MaxSecretSize)
+	// Check if secret driver is defined
+	if spec.Driver != nil {
+		// Ensure secret driver has a name
+		if spec.Driver.Name == "" {
+			return grpc.Errorf(codes.InvalidArgument, "secret driver must have a name")
+		}
+		return nil
+	}
+	if err := validation.ValidateSecretPayload(spec.Data); err != nil {
+		return grpc.Errorf(codes.InvalidArgument, "%s", err.Error())
 	}
 	return nil
 }

vendor/github.com/docker/swarmkit/manager/controlapi/server.go

@@ -10,7 +10,6 @@ import (
 )
 
 var (
-	errNotImplemented  = errors.New("not implemented")
 	errInvalidArgument = errors.New("invalid argument")
 )
 

vendor/github.com/docker/swarmkit/manager/dispatcher/assignments.go

@@ -1,9 +1,13 @@
 package dispatcher
 
 import (
+	"fmt"
+
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/swarmkit/api"
 	"github.com/docker/swarmkit/api/equality"
+	"github.com/docker/swarmkit/api/validation"
+	"github.com/docker/swarmkit/manager/drivers"
 	"github.com/docker/swarmkit/manager/state/store"
 )
 
@@ -24,15 +28,16 @@ type typeAndID struct {
 }
 
 type assignmentSet struct {
+	dp                   *drivers.DriverProvider
 	tasksMap             map[string]*api.Task
 	tasksUsingDependency map[typeAndID]map[string]struct{}
 	changes              map[typeAndID]*api.AssignmentChange
-
-	log *logrus.Entry
+	log                  *logrus.Entry
 }
 
-func newAssignmentSet(log *logrus.Entry) *assignmentSet {
+func newAssignmentSet(log *logrus.Entry, dp *drivers.DriverProvider) *assignmentSet {
 	return &assignmentSet{
+		dp:                   dp,
 		changes:              make(map[typeAndID]*api.AssignmentChange),
 		tasksMap:             make(map[string]*api.Task),
 		tasksUsingDependency: make(map[typeAndID]map[string]struct{}),
@@ -53,12 +58,13 @@ func (a *assignmentSet) addTaskDependencies(readTx store.ReadTx, t *api.Task) {
 		if len(a.tasksUsingDependency[mapKey]) == 0 {
 			a.tasksUsingDependency[mapKey] = make(map[string]struct{})
 
-			secret := store.GetSecret(readTx, secretID)
-			if secret == nil {
+			secret, err := a.secret(readTx, secretID)
+			if err != nil {
 				a.log.WithFields(logrus.Fields{
 					"secret.id":   secretID,
 					"secret.name": secretRef.SecretName,
-				}).Debug("secret not found")
+					"error":       err,
+				}).Error("failed to fetch secret")
 				continue
 			}
 
@@ -245,3 +251,29 @@ func (a *assignmentSet) message() api.AssignmentsMessage {
 
 	return message
 }
+
+// secret populates the secret value from raft store. For external secrets, the value is populated
+// from the secret driver.
+func (a *assignmentSet) secret(readTx store.ReadTx, secretID string) (*api.Secret, error) {
+	secret := store.GetSecret(readTx, secretID)
+	if secret == nil {
+		return nil, fmt.Errorf("secret not found")
+	}
+	if secret.Spec.Driver == nil {
+		return secret, nil
+	}
+	d, err := a.dp.NewSecretDriver(secret.Spec.Driver)
+	if err != nil {
+		return nil, err
+	}
+	value, err := d.Get(&secret.Spec)
+	if err != nil {
+		return nil, err
+	}
+	if err := validation.ValidateSecretPayload(value); err != nil {
+		return nil, err
+	}
+	// Assign the secret
+	secret.Spec.Data = value
+	return secret, nil
+}

vendor/github.com/docker/swarmkit/manager/dispatcher/dispatcher.go

@@ -17,6 +17,7 @@ import (
 	"github.com/docker/swarmkit/api/equality"
 	"github.com/docker/swarmkit/ca"
 	"github.com/docker/swarmkit/log"
+	"github.com/docker/swarmkit/manager/drivers"
 	"github.com/docker/swarmkit/manager/state/store"
 	"github.com/docker/swarmkit/remotes"
 	"github.com/docker/swarmkit/watch"
@@ -125,6 +126,7 @@ type Dispatcher struct {
 	ctx                  context.Context
 	cancel               context.CancelFunc
 	clusterUpdateQueue   *watch.Queue
+	dp                   *drivers.DriverProvider
 
 	taskUpdates     map[string]*api.TaskStatus // indexed by task ID
 	taskUpdatesLock sync.Mutex
@@ -142,8 +144,9 @@ type Dispatcher struct {
 }
 
 // New returns Dispatcher with cluster interface(usually raft.Node).
-func New(cluster Cluster, c *Config) *Dispatcher {
+func New(cluster Cluster, c *Config, dp *drivers.DriverProvider) *Dispatcher {
 	d := &Dispatcher{
+		dp:                    dp,
 		nodes:                 newNodeStore(c.HeartbeatPeriod, c.HeartbeatEpsilon, c.GracePeriodMultiplier, c.RateLimitPeriod),
 		downNodes:             newNodeStore(defaultNodeDownPeriod, 0, 1, 0),
 		store:                 cluster.MemoryStore(),
@@ -836,7 +839,7 @@ func (d *Dispatcher) Assignments(r *api.AssignmentsRequest, stream api.Dispatche
 	var (
 		sequence    int64
 		appliesTo   string
-		assignments = newAssignmentSet(log)
+		assignments = newAssignmentSet(log, d.dp)
 	)
 
 	sendMessage := func(msg api.AssignmentsMessage, assignmentType api.AssignmentsMessage_Type) error {

vendor/github.com/docker/swarmkit/manager/drivers/provider.go

@@ -0,0 +1,34 @@
+package drivers
+
+import (
+	"fmt"
+
+	"github.com/docker/docker/pkg/plugingetter"
+	"github.com/docker/swarmkit/api"
+)
+
+// DriverProvider provides external drivers
+type DriverProvider struct {
+	pluginGetter plugingetter.PluginGetter
+}
+
+// New returns a new driver provider
+func New(pluginGetter plugingetter.PluginGetter) *DriverProvider {
+	return &DriverProvider{pluginGetter: pluginGetter}
+}
+
+// NewSecretDriver creates a new driver for fetching secrets
+func (m *DriverProvider) NewSecretDriver(driver *api.Driver) (*SecretDriver, error) {
+	if m.pluginGetter == nil {
+		return nil, fmt.Errorf("plugin getter is nil")
+	}
+	if driver == nil && driver.Name == "" {
+		return nil, fmt.Errorf("driver specification is nil")
+	}
+	// Search for the specified plugin
+	plugin, err := m.pluginGetter.Get(driver.Name, SecretsProviderCapability, plugingetter.Lookup)
+	if err != nil {
+		return nil, err
+	}
+	return NewSecretDriver(plugin), nil
+}

vendor/github.com/docker/swarmkit/manager/drivers/secrets.go

@@ -0,0 +1,55 @@
+package drivers
+
+import (
+	"fmt"
+
+	"github.com/docker/docker/pkg/plugingetter"
+	"github.com/docker/swarmkit/api"
+)
+
+const (
+	// SecretsProviderAPI is the endpoint for fetching secrets from plugins
+	SecretsProviderAPI = "/SecretProvider.GetSecret"
+
+	// SecretsProviderCapability is the secrets provider plugin capability identification
+	SecretsProviderCapability = "secretprovider"
+)
+
+// SecretDriver provides secrets from different stores
+type SecretDriver struct {
+	plugin plugingetter.CompatPlugin
+}
+
+// NewSecretDriver creates a new driver that provides third party secrets
+func NewSecretDriver(plugin plugingetter.CompatPlugin) *SecretDriver {
+	return &SecretDriver{plugin: plugin}
+}
+
+// Get gets a secret from the secret provider
+func (d *SecretDriver) Get(spec *api.SecretSpec) ([]byte, error) {
+	if spec == nil {
+		return nil, fmt.Errorf("spec is nil")
+	}
+	var secretResp SecretsProviderResponse
+	secretReq := &SecretsProviderRequest{Name: spec.Annotations.Name}
+	err := d.plugin.Client().Call(SecretsProviderAPI, secretReq, &secretResp)
+	if err != nil {
+		return nil, err
+	}
+	if secretResp.Err != "" {
+		return nil, fmt.Errorf(secretResp.Err)
+	}
+	// Assign the secret value
+	return []byte(secretResp.Value), nil
+}
+
+// SecretsProviderRequest is the secrets provider request.
+type SecretsProviderRequest struct {
+	Name string `json:"name"` // Name is the name of the secret plugin
+}
+
+// SecretsProviderResponse is the secrets provider response.
+type SecretsProviderResponse struct {
+	Value string `json:"value"` // Value is the value of the secret
+	Err   string `json:"err"`   // Err is the error response of the plugin
+}

vendor/github.com/docker/swarmkit/manager/manager.go

@@ -26,6 +26,7 @@ import (
 	"github.com/docker/swarmkit/manager/allocator/networkallocator"
 	"github.com/docker/swarmkit/manager/controlapi"
 	"github.com/docker/swarmkit/manager/dispatcher"
+	"github.com/docker/swarmkit/manager/drivers"
 	"github.com/docker/swarmkit/manager/health"
 	"github.com/docker/swarmkit/manager/keymanager"
 	"github.com/docker/swarmkit/manager/logbroker"
@@ -218,7 +219,7 @@ func New(config *Config) (*Manager, error) {
 	m := &Manager{
 		config:          *config,
 		caserver:        ca.NewServer(raftNode.MemoryStore(), config.SecurityConfig, config.RootCAPaths),
-		dispatcher:      dispatcher.New(raftNode, dispatcher.DefaultConfig()),
+		dispatcher:      dispatcher.New(raftNode, dispatcher.DefaultConfig(), drivers.New(config.PluginGetter)),
 		logbroker:       logbroker.New(raftNode.MemoryStore()),
 		server:          grpc.NewServer(opts...),
 		localserver:     grpc.NewServer(opts...),

vendor/github.com/docker/swarmkit/manager/scheduler/decision_tree.go

@@ -20,10 +20,7 @@ type decisionTree struct {
 // (lowest) first according to the sorting function. Must be called on a leaf
 // of the decision tree.
 //
-// The caller may modify the nodes in the returned slice. This has the effect
-// of changing the nodes in the decision tree entry. The next node to
-// findBestNodes on this decisionTree entry will take into account the changes
-// that were made to the nodes.
+// The caller may modify the nodes in the returned slice.
 func (dt *decisionTree) orderedNodes(meetsConstraints func(*NodeInfo) bool, nodeLess func(*NodeInfo, *NodeInfo) bool) []NodeInfo {
 	if dt.nodeHeap.length != len(dt.nodeHeap.nodes) {
 		// We already collapsed the heap into a sorted slice, so