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Merge pull request #539 from bergwolf/crng

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Reseed guest random number generator after booting from vm factory
This commit is contained in:
Graham Whaley 2018-08-02 11:18:34 +01:00 committed by GitHub
commit c871a90b4d
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GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 388 additions and 147 deletions
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4
Gopkg.lock generated
View File

@ -100,7 +100,7 @@
"protocols/client",
"protocols/grpc"
]
revision = "061f7a6154344c07b7e3c337c2dac33082fe51ec"
revision = "eec68398287d9491fe648a8e54fb942cf6b6d934"
[[projects]]
name = "github.com/kubernetes-incubator/cri-o"
@ -264,6 +264,6 @@
[solve-meta]
analyzer-name = "dep"
analyzer-version = 1
inputs-digest = "50ac161303ae5e6cb2a559d4f027bdfd86d45ee5825efd1d323d8c6d432d1b2f"
inputs-digest = "ea1297c4bd6bd805ba2ebf07375ba0fd37e1e55a65df361e484934d690ee829e"
solver-name = "gps-cdcl"
solver-version = 1

2
Gopkg.toml
View File

@ -60,7 +60,7 @@
[[constraint]]
name = "github.com/kata-containers/agent"
revision = "061f7a6154344c07b7e3c337c2dac33082fe51ec"
revision = "eec68398287d9491fe648a8e54fb942cf6b6d934"
[[constraint]]
name = "github.com/containerd/cri-containerd"

457
vendor/github.com/kata-containers/agent/protocols/grpc/agent.pb.go generated vendored
View File

@ -51,6 +51,7 @@
RemoveInterfaceRequest
UpdateRoutesRequest
OnlineCPUMemRequest
ReseedRandomDevRequest
Storage
Device
StringUser
@ -1367,6 +1368,23 @@ func (m *OnlineCPUMemRequest) GetNbCpus() uint32 {
return 0
}
type ReseedRandomDevRequest struct {
// Data specifies the random data used to reseed the guest crng.
Data []byte `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`
}
func (m *ReseedRandomDevRequest) Reset() { *m = ReseedRandomDevRequest{} }
func (m *ReseedRandomDevRequest) String() string { return proto.CompactTextString(m) }
func (*ReseedRandomDevRequest) ProtoMessage() {}
func (*ReseedRandomDevRequest) Descriptor() ([]byte, []int) { return fileDescriptorAgent, []int{41} }
func (m *ReseedRandomDevRequest) GetData() []byte {
if m != nil {
return m.Data
}
return nil
}
// Storage represents both the rootfs of the container, and any volume that
// could have been defined through the Mount list of the OCI specification.
type Storage struct {
@ -1400,7 +1418,7 @@ type Storage struct {
func (m *Storage) Reset() { *m = Storage{} }
func (m *Storage) String() string { return proto.CompactTextString(m) }
func (*Storage) ProtoMessage() {}
func (*Storage) Descriptor() ([]byte, []int) { return fileDescriptorAgent, []int{41} }
func (*Storage) Descriptor() ([]byte, []int) { return fileDescriptorAgent, []int{42} }
func (m *Storage) GetDriver() string {
if m != nil {
@ -1483,7 +1501,7 @@ type Device struct {
func (m *Device) Reset() { *m = Device{} }
func (m *Device) String() string { return proto.CompactTextString(m) }
func (*Device) ProtoMessage() {}
func (*Device) Descriptor() ([]byte, []int) { return fileDescriptorAgent, []int{42} }
func (*Device) Descriptor() ([]byte, []int) { return fileDescriptorAgent, []int{43} }
func (m *Device) GetId() string {
if m != nil {
@ -1529,7 +1547,7 @@ type StringUser struct {
func (m *StringUser) Reset() { *m = StringUser{} }
func (m *StringUser) String() string { return proto.CompactTextString(m) }
func (*StringUser) ProtoMessage() {}
func (*StringUser) Descriptor() ([]byte, []int) { return fileDescriptorAgent, []int{43} }
func (*StringUser) Descriptor() ([]byte, []int) { return fileDescriptorAgent, []int{44} }
func (m *StringUser) GetUid() string {
if m != nil {
@ -1594,6 +1612,7 @@ func init() {
proto.RegisterType((*RemoveInterfaceRequest)(nil), "grpc.RemoveInterfaceRequest")
proto.RegisterType((*UpdateRoutesRequest)(nil), "grpc.UpdateRoutesRequest")
proto.RegisterType((*OnlineCPUMemRequest)(nil), "grpc.OnlineCPUMemRequest")
proto.RegisterType((*ReseedRandomDevRequest)(nil), "grpc.ReseedRandomDevRequest")
proto.RegisterType((*Storage)(nil), "grpc.Storage")
proto.RegisterType((*Device)(nil), "grpc.Device")
proto.RegisterType((*StringUser)(nil), "grpc.StringUser")
@ -1644,6 +1663,7 @@ type AgentServiceClient interface {
CreateSandbox(ctx context.Context, in *CreateSandboxRequest, opts ...grpc1.CallOption) (*google_protobuf2.Empty, error)
DestroySandbox(ctx context.Context, in *DestroySandboxRequest, opts ...grpc1.CallOption) (*google_protobuf2.Empty, error)
OnlineCPUMem(ctx context.Context, in *OnlineCPUMemRequest, opts ...grpc1.CallOption) (*google_protobuf2.Empty, error)
ReseedRandomDev(ctx context.Context, in *ReseedRandomDevRequest, opts ...grpc1.CallOption) (*google_protobuf2.Empty, error)
}
type agentServiceClient struct {
@ -1861,6 +1881,15 @@ func (c *agentServiceClient) OnlineCPUMem(ctx context.Context, in *OnlineCPUMemR
return out, nil
}
func (c *agentServiceClient) ReseedRandomDev(ctx context.Context, in *ReseedRandomDevRequest, opts ...grpc1.CallOption) (*google_protobuf2.Empty, error) {
out := new(google_protobuf2.Empty)
err := grpc1.Invoke(ctx, "/grpc.AgentService/ReseedRandomDev", in, out, c.cc, opts...)
if err != nil {
return nil, err
}
return out, nil
}
// Server API for AgentService service
type AgentServiceServer interface {
@ -1897,6 +1926,7 @@ type AgentServiceServer interface {
CreateSandbox(context.Context, *CreateSandboxRequest) (*google_protobuf2.Empty, error)
DestroySandbox(context.Context, *DestroySandboxRequest) (*google_protobuf2.Empty, error)
OnlineCPUMem(context.Context, *OnlineCPUMemRequest) (*google_protobuf2.Empty, error)
ReseedRandomDev(context.Context, *ReseedRandomDevRequest) (*google_protobuf2.Empty, error)
}
func RegisterAgentServiceServer(s *grpc1.Server, srv AgentServiceServer) {
@ -2317,6 +2347,24 @@ func _AgentService_OnlineCPUMem_Handler(srv interface{}, ctx context.Context, de
return interceptor(ctx, in, info, handler)
}
func _AgentService_ReseedRandomDev_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc1.UnaryServerInterceptor) (interface{}, error) {
in := new(ReseedRandomDevRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(AgentServiceServer).ReseedRandomDev(ctx, in)
}
info := &grpc1.UnaryServerInfo{
Server: srv,
FullMethod: "/grpc.AgentService/ReseedRandomDev",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(AgentServiceServer).ReseedRandomDev(ctx, req.(*ReseedRandomDevRequest))
}
return interceptor(ctx, in, info, handler)
}
var _AgentService_serviceDesc = grpc1.ServiceDesc{
ServiceName: "grpc.AgentService",
HandlerType: (*AgentServiceServer)(nil),
@ -2413,6 +2461,10 @@ var _AgentService_serviceDesc = grpc1.ServiceDesc{
MethodName: "OnlineCPUMem",
Handler: _AgentService_OnlineCPUMem_Handler,
},
{
MethodName: "ReseedRandomDev",
Handler: _AgentService_ReseedRandomDev_Handler,
},
},
Streams: []grpc1.StreamDesc{},
Metadata: "agent.proto",
@ -4017,6 +4069,30 @@ func (m *OnlineCPUMemRequest) MarshalTo(dAtA []byte) (int, error) {
return i, nil
}
func (m *ReseedRandomDevRequest) Marshal() (dAtA []byte, err error) {
size := m.Size()
dAtA = make([]byte, size)
n, err := m.MarshalTo(dAtA)
if err != nil {
return nil, err
}
return dAtA[:n], nil
}
func (m *ReseedRandomDevRequest) MarshalTo(dAtA []byte) (int, error) {
var i int
_ = i
var l int
_ = l
if len(m.Data) > 0 {
dAtA[i] = 0x12
i++
i = encodeVarintAgent(dAtA, i, uint64(len(m.Data)))
i += copy(dAtA[i:], m.Data)
}
return i, nil
}
func (m *Storage) Marshal() (dAtA []byte, err error) {
size := m.Size()
dAtA = make([]byte, size)
@ -4898,6 +4974,16 @@ func (m *OnlineCPUMemRequest) Size() (n int) {
return n
}
func (m *ReseedRandomDevRequest) Size() (n int) {
var l int
_ = l
l = len(m.Data)
if l > 0 {
n += 1 + l + sovAgent(uint64(l))
}
return n
}
func (m *Storage) Size() (n int) {
var l int
_ = l
@ -10210,6 +10296,87 @@ func (m *OnlineCPUMemRequest) Unmarshal(dAtA []byte) error {
}
return nil
}
func (m *ReseedRandomDevRequest) Unmarshal(dAtA []byte) error {
l := len(dAtA)
iNdEx := 0
for iNdEx < l {
preIndex := iNdEx
var wire uint64
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowAgent
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
wire |= (uint64(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
fieldNum := int32(wire >> 3)
wireType := int(wire & 0x7)
if wireType == 4 {
return fmt.Errorf("proto: ReseedRandomDevRequest: wiretype end group for non-group")
}
if fieldNum <= 0 {
return fmt.Errorf("proto: ReseedRandomDevRequest: illegal tag %d (wire type %d)", fieldNum, wire)
}
switch fieldNum {
case 2:
if wireType != 2 {
return fmt.Errorf("proto: wrong wireType = %d for field Data", wireType)
}
var byteLen int
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowAgent
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
byteLen |= (int(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
if byteLen < 0 {
return ErrInvalidLengthAgent
}
postIndex := iNdEx + byteLen
if postIndex > l {
return io.ErrUnexpectedEOF
}
m.Data = append(m.Data[:0], dAtA[iNdEx:postIndex]...)
if m.Data == nil {
m.Data = []byte{}
}
iNdEx = postIndex
default:
iNdEx = preIndex
skippy, err := skipAgent(dAtA[iNdEx:])
if err != nil {
return err
}
if skippy < 0 {
return ErrInvalidLengthAgent
}
if (iNdEx + skippy) > l {
return io.ErrUnexpectedEOF
}
iNdEx += skippy
}
}
if iNdEx > l {
return io.ErrUnexpectedEOF
}
return nil
}
func (m *Storage) Unmarshal(dAtA []byte) error {
l := len(dAtA)
iNdEx := 0
@ -10874,147 +11041,149 @@ var (
func init() { proto.RegisterFile("agent.proto", fileDescriptorAgent) }
var fileDescriptorAgent = []byte{
// 2258 bytes of a gzipped FileDescriptorProto
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0x00, 0x00,
}

3
virtcontainers/agent.go
View File

@ -218,4 +218,7 @@ type agent interface {
// getSharePath will return the agent 9pfs share mount path
getSharePath(id string) string
// reseedRNG will reseed the guest random number generator
reseedRNG(data []byte) error
}

6
virtcontainers/factory/factory.go
View File

@ -151,6 +151,12 @@ func (f *factory) GetVM(config vc.VMConfig) (*vc.VM, error) {
return nil, err
}
// reseed RNG so that shared memory VMs do not generate same random numbers.
err = vm.ReseedRNG()
if err != nil {
return nil, err
}
online := false
baseConfig := f.base.Config().HypervisorConfig
if baseConfig.DefaultVCPUs < hypervisorConfig.DefaultVCPUs {

5
virtcontainers/hyperstart_agent.go
View File

@ -884,3 +884,8 @@ func (h *hyper) resumeContainer(sandbox *Sandbox, c Container) error {
func (h *hyper) cleanupSandbox(sandbox *Sandbox) error {
return nil
}
func (h *hyper) reseedRNG(data []byte) error {
// hyperstart-agent does not support reseeding
return nil
}

8
virtcontainers/hyperstart_agent_test.go
View File

@ -198,3 +198,11 @@ func TestHyperConfigure(t *testing.T) {
err = h.configure(m, id, dir, false, c)
assert.Nil(err)
}
func TestHyperReseedAPI(t *testing.T) {
assert := assert.New(t)
h := &hyper{}
err := h.reseedRNG([]byte{})
assert.Nil(err)
}

11
virtcontainers/kata_agent.go
View File

@ -1267,6 +1267,14 @@ func (k *kataAgent) closeProcessStdin(c *Container, ProcessID string) error {
return err
}
func (k *kataAgent) reseedRNG(data []byte) error {
_, err := k.sendReq(&grpc.ReseedRandomDevRequest{
Data: data,
})
return err
}
type reqFunc func(context.Context, interface{}, ...golangGrpc.CallOption) (interface{}, error)
func (k *kataAgent) installReqFunc(c *kataclient.AgentClient) {
@ -1333,6 +1341,9 @@ func (k *kataAgent) installReqFunc(c *kataclient.AgentClient) {
k.reqHandlers["grpc.ResumeContainerRequest"] = func(ctx context.Context, req interface{}, opts ...golangGrpc.CallOption) (interface{}, error) {
return k.client.ResumeContainer(ctx, req.(*grpc.ResumeContainerRequest), opts...)
}
k.reqHandlers["grpc.ReseedRandomDevRequest"] = func(ctx context.Context, req interface{}, opts ...golangGrpc.CallOption) (interface{}, error) {
return k.client.ReseedRandomDev(ctx, req.(*grpc.ReseedRandomDevRequest), opts...)
}
}
func (k *kataAgent) sendReq(request interface{}) (interface{}, error) {

4
virtcontainers/kata_agent_test.go
View File

@ -225,6 +225,10 @@ func (p *gRPCProxy) ResumeContainer(ctx context.Context, req *pb.ResumeContainer
return emptyResp, nil
}
func (p *gRPCProxy) ReseedRandomDev(ctx context.Context, req *pb.ReseedRandomDevRequest) (*gpb.Empty, error) {
return emptyResp, nil
}
func gRPCRegister(s *grpc.Server, srv interface{}) {
switch g := srv.(type) {
case *gRPCProxy:

5
virtcontainers/noop_agent.go
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@ -160,3 +160,8 @@ func (n *noopAgent) getVMPath(id string) string {
func (n *noopAgent) getSharePath(id string) string {
return ""
}
// reseedRNG is the Noop agent RND reseeder. It does nothing.
func (n *noopAgent) reseedRNG(data []byte) error {
return nil
}

8
virtcontainers/noop_agent_test.go
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@ -209,3 +209,11 @@ func TestNoopAgentProcessListContainer(t *testing.T) {
t.Fatal(err)
}
}
func TestNoopAgentReseedRNG(t *testing.T) {
n := &noopAgent{}
err := n.reseedRNG([]byte{})
if err != nil {
t.Fatal("reseedRNG failed")
}
}

20
virtcontainers/vm.go
View File

@ -191,6 +191,26 @@ func (v *VM) OnlineCPUMemory() error {
return err
}
// ReseedRNG adds random entropy to guest random number generator
// and reseeds it.
func (v *VM) ReseedRNG() error {
v.logger().Infof("reseed guest random number generator")
urandomDev := "/dev/urandom"
data := make([]byte, 512)
f, err := os.OpenFile(urandomDev, os.O_RDONLY, 0)
if err != nil {
v.logger().WithError(err).Warn("fail to open %s", urandomDev)
return err
}
defer f.Close()
if _, err = f.Read(data); err != nil {
v.logger().WithError(err).Warn("fail to read %s", urandomDev)
return err
}
return v.agent.reseedRNG(data)
}
func (v *VM) assignSandbox(s *Sandbox) error {
// add vm symlinks
// - link vm socket from sandbox dir (/run/vc/vm/sbid/<kata.sock>) to vm dir (/run/vc/vm/vmid/<kata.sock>)

2
virtcontainers/vm_test.go
View File

@ -50,6 +50,8 @@ func TestNewVM(t *testing.T) {
assert.Nil(err)
err = vm.OnlineCPUMemory()
assert.Nil(err)
err = vm.ReseedRNG()
assert.Nil(err)
// template VM
config.HypervisorConfig.BootFromTemplate = true