*: support deleting a role in auth v3

This commit implements RoleDelete() RPC for supporting deleting a role
in auth v3. It also adds a new subcommand "role delete" to etcdctl.

auth/store.go

@@ -91,6 +91,9 @@ type AuthStore interface {
 	// RoleRevoke gets the detailed information of a role
 	RoleRevoke(r *pb.AuthRoleRevokeRequest) (*pb.AuthRoleRevokeResponse, error)
 
+	// RoleDelete gets the detailed information of a role
+	RoleDelete(r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error)
+
 	// UsernameFromToken gets a username from the given Token
 	UsernameFromToken(token string) (string, bool)
 
@@ -428,6 +431,34 @@ func (as *authStore) RoleRevoke(r *pb.AuthRoleRevokeRequest) (*pb.AuthRoleRevoke
 	return &pb.AuthRoleRevokeResponse{}, nil
 }
 
+func (as *authStore) RoleDelete(r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error) {
+	// TODO(mitake): current scheme of role deletion allows existing users to have the deleted roles
+	//
+	// Assume a case like below:
+	// create a role r1
+	// create a user u1 and grant r1 to u1
+	// delete r1
+	//
+	// After this sequence, u1 is still granted the role r1. So if admin create a new role with the name r1,
+	// the new r1 is automatically granted u1.
+	// In some cases, it would be confusing. So we need to provide an option for deleting the grant relation
+	// from all users.
+
+	tx := as.be.BatchTx()
+	tx.Lock()
+	defer tx.Unlock()
+
+	_, vs := tx.UnsafeRange(authRolesBucketName, []byte(r.Role), nil, 0)
+	if len(vs) != 1 {
+		return nil, ErrRoleNotFound
+	}
+
+	tx.UnsafeDelete(authRolesBucketName, []byte(r.Role))
+
+	plog.Noticef("deleted role %s", r.Role)
+	return &pb.AuthRoleDeleteResponse{}, nil
+}
+
 func (as *authStore) RoleAdd(r *pb.AuthRoleAddRequest) (*pb.AuthRoleAddResponse, error) {
 	tx := as.be.BatchTx()
 	tx.Lock()

clientv3/auth.go

@@ -39,6 +39,7 @@ type (
 	AuthRoleGrantResponse          pb.AuthRoleGrantResponse
 	AuthRoleGetResponse            pb.AuthRoleGetResponse
 	AuthRoleRevokeResponse         pb.AuthRoleRevokeResponse
+	AuthRoleDeleteResponse         pb.AuthRoleDeleteResponse
 
 	PermissionType authpb.Permission_Type
 )
@@ -85,6 +86,9 @@ type Auth interface {
 
 	// RoleRevoke revokes a key from a user.
 	RoleRevoke(ctx context.Context, role string, key string) (*AuthRoleRevokeResponse, error)
+
+	// RoleDelete deletes a role.
+	RoleDelete(ctx context.Context, role string) (*AuthRoleDeleteResponse, error)
 }
 
 type auth struct {
@@ -167,6 +171,11 @@ func (auth *auth) RoleRevoke(ctx context.Context, role string, key string) (*Aut
 	return (*AuthRoleRevokeResponse)(resp), rpctypes.Error(err)
 }
 
+func (auth *auth) RoleDelete(ctx context.Context, role string) (*AuthRoleDeleteResponse, error) {
+	resp, err := auth.remote.RoleDelete(ctx, &pb.AuthRoleDeleteRequest{Role: role})
+	return (*AuthRoleDeleteResponse)(resp), rpctypes.Error(err)
+}
+
 func StrToPermissionType(s string) (PermissionType, error) {
 	val, ok := authpb.Permission_Type_value[strings.ToUpper(s)]
 	if ok {

etcdctl/ctlv3/command/role_command.go

@@ -33,6 +33,7 @@ func NewRoleCommand() *cobra.Command {
 	ac.AddCommand(newRoleGrantCommand())
 	ac.AddCommand(newRoleGetCommand())
 	ac.AddCommand(newRoleRevokePermissionCommand())
+	ac.AddCommand(newRoleDeleteCommand())
 
 	return ac
 }
@@ -69,6 +70,14 @@ func newRoleRevokePermissionCommand() *cobra.Command {
 	}
 }
 
+func newRoleDeleteCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:   "delete <role name>",
+		Short: "delete a role",
+		Run:   roleDeleteCommandFunc,
+	}
+}
+
 // roleAddCommandFunc executes the "role add" command.
 func roleAddCommandFunc(cmd *cobra.Command, args []string) {
 	if len(args) != 1 {
@@ -141,3 +150,17 @@ func roleRevokePermissionCommandFunc(cmd *cobra.Command, args []string) {
 
 	fmt.Printf("Permission of key %s is revoked from role %s\n", args[1], args[0])
 }
+
+// roleDeleteCommandFunc executes the "role delete" command.
+func roleDeleteCommandFunc(cmd *cobra.Command, args []string) {
+	if len(args) != 1 {
+		ExitWithError(ExitBadArgs, fmt.Errorf("role delete command requires role name as its argument."))
+	}
+
+	_, err := mustClientFromCmd(cmd).Auth.RoleDelete(context.TODO(), args[0])
+	if err != nil {
+		ExitWithError(ExitError, err)
+	}
+
+	fmt.Printf("Role %s deleted\n", args[0])
+}

etcdserver/api/v3rpc/auth.go

@@ -61,8 +61,11 @@ func (as *AuthServer) RoleAdd(ctx context.Context, r *pb.AuthRoleAddRequest) (*p
 }
 
 func (as *AuthServer) RoleDelete(ctx context.Context, r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error) {
-	plog.Info("not implemented yet")
+	resp, err := as.authenticator.RoleDelete(ctx, r)
-	return nil, nil
+	if err != nil {
+		return nil, togRPCError(err)
+	}
+	return resp, nil
 }
 
 func (as *AuthServer) RoleGet(ctx context.Context, r *pb.AuthRoleGetRequest) (*pb.AuthRoleGetResponse, error) {

etcdserver/apply.go

@@ -67,6 +67,7 @@ type applierV3 interface {
 	RoleGrant(ua *pb.AuthRoleGrantRequest) (*pb.AuthRoleGrantResponse, error)
 	RoleGet(ua *pb.AuthRoleGetRequest) (*pb.AuthRoleGetResponse, error)
 	RoleRevoke(ua *pb.AuthRoleRevokeRequest) (*pb.AuthRoleRevokeResponse, error)
+	RoleDelete(ua *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error)
 }
 
 type applierV3backend struct {
@@ -126,6 +127,8 @@ func (s *EtcdServer) applyV3Request(r *pb.InternalRaftRequest) *applyResult {
 		ar.resp, ar.err = s.applyV3.RoleGet(r.AuthRoleGet)
 	case r.AuthRoleRevoke != nil:
 		ar.resp, ar.err = s.applyV3.RoleRevoke(r.AuthRoleRevoke)
+	case r.AuthRoleDelete != nil:
+		ar.resp, ar.err = s.applyV3.RoleDelete(r.AuthRoleDelete)
 	default:
 		panic("not implemented")
 	}
@@ -568,6 +571,10 @@ func (a *applierV3backend) RoleRevoke(r *pb.AuthRoleRevokeRequest) (*pb.AuthRole
 	return a.s.AuthStore().RoleRevoke(r)
 }
 
+func (a *applierV3backend) RoleDelete(r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error) {
+	return a.s.AuthStore().RoleDelete(r)
+}
+
 type quotaApplierV3 struct {
 	applierV3
 	q Quota

etcdserver/etcdserverpb/raft_internal.pb.go

@@ -57,6 +57,7 @@ type InternalRaftRequest struct {
 	AuthRoleGet            *AuthRoleGetRequest            `protobuf:"bytes,1020,opt,name=auth_role_get,json=authRoleGet" json:"auth_role_get,omitempty"`
 	AuthUserRevoke         *AuthUserRevokeRequest         `protobuf:"bytes,1021,opt,name=auth_user_revoke,json=authUserRevoke" json:"auth_user_revoke,omitempty"`
 	AuthRoleRevoke         *AuthRoleRevokeRequest         `protobuf:"bytes,1022,opt,name=auth_role_revoke,json=authRoleRevoke" json:"auth_role_revoke,omitempty"`
+	AuthRoleDelete         *AuthRoleDeleteRequest         `protobuf:"bytes,1023,opt,name=auth_role_delete,json=authRoleDelete" json:"auth_role_delete,omitempty"`
 }
 
 func (m *InternalRaftRequest) Reset()                    { *m = InternalRaftRequest{} }
@@ -384,6 +385,18 @@ func (m *InternalRaftRequest) MarshalTo(data []byte) (int, error) {
 		}
 		i += n23
 	}
+	if m.AuthRoleDelete != nil {
+		data[i] = 0xfa
+		i++
+		data[i] = 0x3f
+		i++
+		i = encodeVarintRaftInternal(data, i, uint64(m.AuthRoleDelete.Size()))
+		n24, err := m.AuthRoleDelete.MarshalTo(data[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n24
+	}
 	return i, nil
 }
 
@@ -543,6 +556,10 @@ func (m *InternalRaftRequest) Size() (n int) {
 		l = m.AuthRoleRevoke.Size()
 		n += 2 + l + sovRaftInternal(uint64(l))
 	}
+	if m.AuthRoleDelete != nil {
+		l = m.AuthRoleDelete.Size()
+		n += 2 + l + sovRaftInternal(uint64(l))
+	}
 	return n
 }
 
@@ -1470,6 +1487,39 @@ func (m *InternalRaftRequest) Unmarshal(data []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 1023:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field AuthRoleDelete", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaftInternal
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthRaftInternal
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.AuthRoleDelete == nil {
+				m.AuthRoleDelete = &AuthRoleDeleteRequest{}
+			}
+			if err := m.AuthRoleDelete.Unmarshal(data[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRaftInternal(data[iNdEx:])
@@ -1647,47 +1697,47 @@ var (
 )
 
 var fileDescriptorRaftInternal = []byte{
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 }

etcdserver/etcdserverpb/raft_internal.proto

@@ -48,6 +48,7 @@ message InternalRaftRequest {
   AuthRoleGetRequest auth_role_get = 1020;
   AuthUserRevokeRequest auth_user_revoke = 1021;
   AuthRoleRevokeRequest auth_role_revoke = 1022;
+  AuthRoleDeleteRequest auth_role_delete = 1023;
 }
 
 message EmptyResponse {

etcdserver/etcdserverpb/rpc.pb.go

@@ -1622,6 +1622,7 @@ func (*AuthRoleGetRequest) ProtoMessage()               {}
 func (*AuthRoleGetRequest) Descriptor() ([]byte, []int) { return fileDescriptorRpc, []int{54} }
 
 type AuthRoleDeleteRequest struct {
+	Role string `protobuf:"bytes,1,opt,name=role,proto3" json:"role,omitempty"`
 }
 
 func (m *AuthRoleDeleteRequest) Reset()                    { *m = AuthRoleDeleteRequest{} }
@@ -5362,6 +5363,12 @@ func (m *AuthRoleDeleteRequest) MarshalTo(data []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if len(m.Role) > 0 {
+		data[i] = 0xa
+		i++
+		i = encodeVarintRpc(data, i, uint64(len(m.Role)))
+		i += copy(data[i:], m.Role)
+	}
 	return i, nil
 }
 
@@ -6719,6 +6726,10 @@ func (m *AuthRoleGetRequest) Size() (n int) {
 func (m *AuthRoleDeleteRequest) Size() (n int) {
 	var l int
 	_ = l
+	l = len(m.Role)
+	if l > 0 {
+		n += 1 + l + sovRpc(uint64(l))
+	}
 	return n
 }
 
@@ -12719,6 +12730,35 @@ func (m *AuthRoleDeleteRequest) Unmarshal(data []byte) error {
 			return fmt.Errorf("proto: AuthRoleDeleteRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Role", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRpc
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthRpc
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Role = string(data[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRpc(data[iNdEx:])
@@ -14317,169 +14357,169 @@ var (
 )
 
 var fileDescriptorRpc = []byte{
-	// 2617 bytes of a gzipped FileDescriptorProto
+	// 2616 bytes of a gzipped FileDescriptorProto
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-	0xff, 0x21, 0x44, 0x29, 0x94, 0xce, 0x26, 0x00, 0x00,
+	0xb2, 0x78, 0xd4, 0xb9, 0xe2, 0x26, 0x00, 0x00,
 }

etcdserver/etcdserverpb/rpc.proto

@@ -609,6 +609,7 @@ message AuthRoleGetRequest {
 }
 
 message AuthRoleDeleteRequest {
+  string role = 1;
 }
 
 message AuthRoleGrantRequest {

etcdserver/v3_server.go

@@ -69,6 +69,7 @@ type Authenticator interface {
 	RoleGrant(ctx context.Context, r *pb.AuthRoleGrantRequest) (*pb.AuthRoleGrantResponse, error)
 	RoleGet(ctx context.Context, r *pb.AuthRoleGetRequest) (*pb.AuthRoleGetResponse, error)
 	RoleRevoke(ctx context.Context, r *pb.AuthRoleRevokeRequest) (*pb.AuthRoleRevokeResponse, error)
+	RoleDelete(ctx context.Context, r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error)
 }
 
 func (s *EtcdServer) Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeResponse, error) {
@@ -381,6 +382,17 @@ func (s *EtcdServer) RoleRevoke(ctx context.Context, r *pb.AuthRoleRevokeRequest
 	return result.resp.(*pb.AuthRoleRevokeResponse), nil
 }
 
+func (s *EtcdServer) RoleDelete(ctx context.Context, r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error) {
+	result, err := s.processInternalRaftRequest(ctx, pb.InternalRaftRequest{AuthRoleDelete: r})
+	if err != nil {
+		return nil, err
+	}
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthRoleDeleteResponse), nil
+}
+
 func (s *EtcdServer) usernameFromCtx(ctx context.Context) (string, error) {
 	md, mdexist := metadata.FromContext(ctx)
 	if mdexist {