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Merge pull request #75680 from tallclair/psp-refactor

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Clean up some PodSecurityPolicy code
This commit is contained in:
Kubernetes Prow Robot 2019-03-26 21:59:01 -07:00 committed by GitHub
commit ccc90b2ba6
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 130 additions and 180 deletions
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2
pkg/security/podsecuritypolicy/BUILD
View File

@ -49,8 +49,6 @@ go_test(
"//staging/src/k8s.io/api/policy/v1beta1:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/diff:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/validation/field:go_default_library",
"//vendor/github.com/davecgh/go-spew/spew:go_default_library",
"//vendor/github.com/stretchr/testify/assert:go_default_library",
"//vendor/github.com/stretchr/testify/require:go_default_library",
],

37
pkg/security/podsecuritypolicy/provider.go
View File

@ -59,10 +59,10 @@ func NewSimpleProvider(psp *policy.PodSecurityPolicy, namespace string, strategy
}, nil
}
// DefaultPodSecurityContext sets the default values of the required but not filled fields.
// It modifies the SecurityContext and annotations of the provided pod. Validation should be
// used after the context is defaulted to ensure it complies with the required restrictions.
func (s *simpleProvider) DefaultPodSecurityContext(pod *api.Pod) error {
// MutatePod sets the default values of the required but not filled fields.
// Validation should be used after the context is defaulted to ensure it
// complies with the required restrictions.
func (s *simpleProvider) MutatePod(pod *api.Pod) error {
sc := securitycontext.NewPodSecurityContextMutator(pod.Spec.SecurityContext)
if sc.SupplementalGroups() == nil {
@ -104,13 +104,25 @@ func (s *simpleProvider) DefaultPodSecurityContext(pod *api.Pod) error {
pod.Spec.SecurityContext = sc.PodSecurityContext()
for i := range pod.Spec.InitContainers {
if err := s.mutateContainer(pod, &pod.Spec.InitContainers[i]); err != nil {
return err
}
}
for i := range pod.Spec.Containers {
if err := s.mutateContainer(pod, &pod.Spec.Containers[i]); err != nil {
return err
}
}
return nil
}
// DefaultContainerSecurityContext sets the default values of the required but not filled fields.
// mutateContainer sets the default values of the required but not filled fields.
// It modifies the SecurityContext of the container and annotations of the pod. Validation should
// be used after the context is defaulted to ensure it complies with the required restrictions.
func (s *simpleProvider) DefaultContainerSecurityContext(pod *api.Pod, container *api.Container) error {
func (s *simpleProvider) mutateContainer(pod *api.Pod, container *api.Container) error {
sc := securitycontext.NewEffectiveContainerSecurityContextMutator(
securitycontext.NewPodSecurityContextAccessor(pod.Spec.SecurityContext),
securitycontext.NewContainerSecurityContextMutator(container.SecurityContext),
@ -282,11 +294,22 @@ func (s *simpleProvider) ValidatePod(pod *api.Pod) field.ErrorList {
}
}
}
fldPath := field.NewPath("spec", "initContainers")
for i := range pod.Spec.InitContainers {
allErrs = append(allErrs, s.validateContainer(pod, &pod.Spec.InitContainers[i], fldPath.Index(i))...)
}
fldPath = field.NewPath("spec", "containers")
for i := range pod.Spec.Containers {
allErrs = append(allErrs, s.validateContainer(pod, &pod.Spec.Containers[i], fldPath.Index(i))...)
}
return allErrs
}
// Ensure a container's SecurityContext is in compliance with the given constraints
func (s *simpleProvider) ValidateContainer(pod *api.Pod, container *api.Container, containerPath *field.Path) field.ErrorList {
func (s *simpleProvider) validateContainer(pod *api.Pod, container *api.Container, containerPath *field.Path) field.ErrorList {
allErrs := field.ErrorList{}
podSC := securitycontext.NewPodSecurityContextAccessor(pod.Spec.SecurityContext)

228
pkg/security/podsecuritypolicy/provider_test.go
View File

@ -20,10 +20,8 @@ import (
"fmt"
"reflect"
"strconv"
"strings"
"testing"
"github.com/davecgh/go-spew/spew"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
@ -31,7 +29,6 @@ import (
policy "k8s.io/api/policy/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/diff"
"k8s.io/apimachinery/pkg/util/validation/field"
api "k8s.io/kubernetes/pkg/apis/core"
k8s_api_v1 "k8s.io/kubernetes/pkg/apis/core/v1"
"k8s.io/kubernetes/pkg/security/apparmor"
@ -41,7 +38,7 @@ import (
const defaultContainerName = "test-c"
func TestDefaultPodSecurityContextNonmutating(t *testing.T) {
func TestMutatePodNonmutating(t *testing.T) {
// Create a pod with a security context that needs filling in
createPod := func() *api.Pod {
return &api.Pod{
@ -86,26 +83,22 @@ func TestDefaultPodSecurityContextNonmutating(t *testing.T) {
psp := createPSP()
provider, err := NewSimpleProvider(psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Fatalf("unable to create provider %v", err)
}
err = provider.DefaultPodSecurityContext(pod)
if err != nil {
t.Fatalf("unable to create psc %v", err)
}
require.NoError(t, err, "unable to create provider")
err = provider.MutatePod(pod)
require.NoError(t, err, "unable to modify pod")
// Creating the provider or the security context should not have mutated the psp or pod
// since all the strategies were permissive
if !reflect.DeepEqual(createPod(), pod) {
diffs := diff.ObjectDiff(createPod(), pod)
t.Errorf("pod was mutated by DefaultPodSecurityContext. diff:\n%s", diffs)
t.Errorf("pod was mutated by MutatePod. diff:\n%s", diffs)
}
if !reflect.DeepEqual(createPSP(), psp) {
t.Error("psp was mutated by DefaultPodSecurityContext")
t.Error("psp was mutated by MutatePod")
}
}
func TestDefaultContainerSecurityContextNonmutating(t *testing.T) {
func TestMutateContainerNonmutating(t *testing.T) {
untrue := false
tests := []struct {
security *api.SecurityContext
@ -134,7 +127,6 @@ func TestDefaultContainerSecurityContextNonmutating(t *testing.T) {
Name: "psp-sa",
Annotations: map[string]string{
seccomp.AllowedProfilesAnnotationKey: "*",
seccomp.DefaultProfileAnnotationKey: "foo",
},
},
Spec: policy.PodSecurityPolicySpec{
@ -162,27 +154,23 @@ func TestDefaultContainerSecurityContextNonmutating(t *testing.T) {
psp := createPSP()
provider, err := NewSimpleProvider(psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Fatalf("unable to create provider %v", err)
}
err = provider.DefaultContainerSecurityContext(pod, &pod.Spec.Containers[0])
if err != nil {
t.Fatalf("unable to create container security context %v", err)
}
require.NoError(t, err, "unable to create provider")
err = provider.MutatePod(pod)
require.NoError(t, err, "unable to modify pod")
// Creating the provider or the security context should not have mutated the psp or pod
// since all the strategies were permissive
if !reflect.DeepEqual(createPod(), pod) {
diffs := diff.ObjectDiff(createPod(), pod)
t.Errorf("pod was mutated by DefaultContainerSecurityContext. diff:\n%s", diffs)
t.Errorf("pod was mutated. diff:\n%s", diffs)
}
if !reflect.DeepEqual(createPSP(), psp) {
t.Error("psp was mutated by DefaultContainerSecurityContext")
t.Error("psp was mutated")
}
}
}
func TestValidatePodSecurityContextFailures(t *testing.T) {
func TestValidatePodFailures(t *testing.T) {
failHostNetworkPod := defaultPod()
failHostNetworkPod.Spec.SecurityContext.HostNetwork = true
@ -445,19 +433,14 @@ func TestValidatePodSecurityContextFailures(t *testing.T) {
expectedError: "Flexvolume driver is not allowed to be used",
},
}
for k, v := range errorCases {
provider, err := NewSimpleProvider(v.psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Fatalf("unable to create provider %v", err)
}
errs := provider.ValidatePod(v.pod)
if len(errs) == 0 {
t.Errorf("%s expected validation failure but did not receive errors", k)
continue
}
if !strings.Contains(errs[0].Error(), v.expectedError) {
t.Errorf("%s received unexpected error %v", k, errs)
}
for name, test := range errorCases {
t.Run(name, func(t *testing.T) {
provider, err := NewSimpleProvider(test.psp, "namespace", NewSimpleStrategyFactory())
require.NoError(t, err, "unable to create provider")
errs := provider.ValidatePod(test.pod)
require.NotEmpty(t, errs, "expected validation failure but did not receive errors")
assert.Contains(t, errs[0].Error(), test.expectedError, "received unexpected error")
})
}
}
@ -504,6 +487,7 @@ func TestValidateContainerFailures(t *testing.T) {
},
}
failSELinuxPod := defaultPod()
failSELinuxPod.Spec.SecurityContext.SELinuxOptions = &api.SELinuxOptions{Level: "foo"}
failSELinuxPod.Spec.Containers[0].SecurityContext.SELinuxOptions = &api.SELinuxOptions{
Level: "bar",
}
@ -619,23 +603,18 @@ func TestValidateContainerFailures(t *testing.T) {
},
}
for k, v := range errorCases {
provider, err := NewSimpleProvider(v.psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Fatalf("unable to create provider %v", err)
}
errs := provider.ValidateContainer(v.pod, &v.pod.Spec.Containers[0], field.NewPath(""))
if len(errs) == 0 {
t.Errorf("%s expected validation failure but did not receive errors", k)
continue
}
if !strings.Contains(errs[0].Error(), v.expectedError) {
t.Errorf("%s received unexpected error %v\nexpected: %s", k, errs, v.expectedError)
}
for name, test := range errorCases {
t.Run(name, func(t *testing.T) {
provider, err := NewSimpleProvider(test.psp, "namespace", NewSimpleStrategyFactory())
require.NoError(t, err, "unable to create provider")
errs := provider.ValidatePod(test.pod)
require.NotEmpty(t, errs, "expected validation failure but did not receive errors")
assert.Contains(t, errs[0].Error(), test.expectedError, "unexpected error")
})
}
}
func TestValidatePodSecurityContextSuccess(t *testing.T) {
func TestValidatePodSuccess(t *testing.T) {
hostNetworkPSP := defaultPSP()
hostNetworkPSP.Spec.HostNetwork = true
hostNetworkPod := defaultPod()
@ -908,16 +887,13 @@ func TestValidatePodSecurityContextSuccess(t *testing.T) {
},
}
for k, v := range successCases {
provider, err := NewSimpleProvider(v.psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Fatalf("unable to create provider %v", err)
}
errs := provider.ValidatePod(v.pod)
if len(errs) != 0 {
t.Errorf("%s expected validation pass but received errors %v", k, errs)
continue
}
for name, test := range successCases {
t.Run(name, func(t *testing.T) {
provider, err := NewSimpleProvider(test.psp, "namespace", NewSimpleStrategyFactory())
require.NoError(t, err, "unable to create provider")
errs := provider.ValidatePod(test.pod)
assert.Empty(t, errs, "expected validation pass but received errors")
})
}
}
@ -941,6 +917,7 @@ func TestValidateContainerSuccess(t *testing.T) {
},
}
seLinuxPod := defaultPod()
seLinuxPod.Spec.SecurityContext.SELinuxOptions = &api.SELinuxOptions{Level: "foo"}
seLinuxPod.Spec.Containers[0].SecurityContext.SELinuxOptions = &api.SELinuxOptions{
Level: "foo",
}
@ -1007,6 +984,7 @@ func TestValidateContainerSuccess(t *testing.T) {
seccompPod := defaultPod()
seccompPod.Annotations = map[string]string{
api.SeccompPodAnnotationKey: "foo",
api.SeccompContainerAnnotationKeyPrefix + seccompPod.Spec.Containers[0].Name: "foo",
}
@ -1073,16 +1051,13 @@ func TestValidateContainerSuccess(t *testing.T) {
},
}
for k, v := range successCases {
provider, err := NewSimpleProvider(v.psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Fatalf("unable to create provider %v", err)
}
errs := provider.ValidateContainer(v.pod, &v.pod.Spec.Containers[0], field.NewPath(""))
if len(errs) != 0 {
t.Errorf("%s expected validation pass but received errors %v\n%s", k, errs, spew.Sdump(v.pod.ObjectMeta))
continue
}
for name, test := range successCases {
t.Run(name, func(t *testing.T) {
provider, err := NewSimpleProvider(test.psp, "namespace", NewSimpleStrategyFactory())
require.NoError(t, err, "unable to create provider")
errs := provider.ValidatePod(test.pod)
assert.Empty(t, errs, "expected validation pass but received errors")
})
}
}
@ -1140,29 +1115,21 @@ func TestGenerateContainerSecurityContextReadOnlyRootFS(t *testing.T) {
},
}
for k, v := range tests {
provider, err := NewSimpleProvider(v.psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Errorf("%s unable to create provider %v", k, err)
continue
}
err = provider.DefaultContainerSecurityContext(v.pod, &v.pod.Spec.Containers[0])
if err != nil {
t.Errorf("%s unable to create container security context %v", k, err)
continue
}
sc := v.pod.Spec.Containers[0].SecurityContext
if v.expected == nil && sc.ReadOnlyRootFilesystem != nil {
t.Errorf("%s expected a nil ReadOnlyRootFilesystem but got %t", k, *sc.ReadOnlyRootFilesystem)
}
if v.expected != nil && sc.ReadOnlyRootFilesystem == nil {
t.Errorf("%s expected a non nil ReadOnlyRootFilesystem but received nil", k)
}
if v.expected != nil && sc.ReadOnlyRootFilesystem != nil && (*v.expected != *sc.ReadOnlyRootFilesystem) {
t.Errorf("%s expected a non nil ReadOnlyRootFilesystem set to %t but got %t", k, *v.expected, *sc.ReadOnlyRootFilesystem)
}
for name, test := range tests {
t.Run(name, func(t *testing.T) {
provider, err := NewSimpleProvider(test.psp, "namespace", NewSimpleStrategyFactory())
require.NoError(t, err, "unable to create provider")
err = provider.MutatePod(test.pod)
require.NoError(t, err, "unable to mutate container")
sc := test.pod.Spec.Containers[0].SecurityContext
if test.expected == nil {
assert.Nil(t, sc.ReadOnlyRootFilesystem, "expected a nil ReadOnlyRootFilesystem")
} else {
require.NotNil(t, sc.ReadOnlyRootFilesystem, "expected a non nil ReadOnlyRootFilesystem")
assert.Equal(t, *test.expected, *sc.ReadOnlyRootFilesystem)
}
})
}
}
@ -1252,55 +1219,42 @@ func TestValidateAllowedVolumes(t *testing.T) {
// reflectively create the volume source
fieldVal := val.Type().Field(i)
volumeSource := api.VolumeSource{}
volumeSourceVolume := reflect.New(fieldVal.Type.Elem())
t.Run(fieldVal.Name, func(t *testing.T) {
volumeSource := api.VolumeSource{}
volumeSourceVolume := reflect.New(fieldVal.Type.Elem())
reflect.ValueOf(&volumeSource).Elem().FieldByName(fieldVal.Name).Set(volumeSourceVolume)
volume := api.Volume{VolumeSource: volumeSource}
reflect.ValueOf(&volumeSource).Elem().FieldByName(fieldVal.Name).Set(volumeSourceVolume)
volume := api.Volume{VolumeSource: volumeSource}
// sanity check before moving on
fsType, err := psputil.GetVolumeFSType(volume)
if err != nil {
t.Errorf("error getting FSType for %s: %s", fieldVal.Name, err.Error())
continue
}
// sanity check before moving on
fsType, err := psputil.GetVolumeFSType(volume)
require.NoError(t, err, "error getting FSType")
// add the volume to the pod
pod := defaultPod()
pod.Spec.Volumes = []api.Volume{volume}
// add the volume to the pod
pod := defaultPod()
pod.Spec.Volumes = []api.Volume{volume}
// create a PSP that allows no volumes
psp := defaultPSP()
// create a PSP that allows no volumes
psp := defaultPSP()
provider, err := NewSimpleProvider(psp, "namespace", NewSimpleStrategyFactory())
if err != nil {
t.Errorf("error creating provider for %s: %s", fieldVal.Name, err.Error())
continue
}
provider, err := NewSimpleProvider(psp, "namespace", NewSimpleStrategyFactory())
require.NoError(t, err, "error creating provider")
// expect a denial for this PSP and test the error message to ensure it's related to the volumesource
errs := provider.ValidatePod(pod)
if len(errs) != 1 {
t.Errorf("expected exactly 1 error for %s but got %v", fieldVal.Name, errs)
} else {
if !strings.Contains(errs.ToAggregate().Error(), fmt.Sprintf("%s volumes are not allowed to be used", fsType)) {
t.Errorf("did not find the expected error, received: %v", errs)
}
}
// expect a denial for this PSP and test the error message to ensure it's related to the volumesource
errs := provider.ValidatePod(pod)
require.Len(t, errs, 1, "expected exactly 1 error")
assert.Contains(t, errs.ToAggregate().Error(), fmt.Sprintf("%s volumes are not allowed to be used", fsType), "did not find the expected error")
// now add the fstype directly to the psp and it should validate
psp.Spec.Volumes = []policy.FSType{fsType}
errs = provider.ValidatePod(pod)
if len(errs) != 0 {
t.Errorf("directly allowing volume expected no errors for %s but got %v", fieldVal.Name, errs)
}
// now add the fstype directly to the psp and it should validate
psp.Spec.Volumes = []policy.FSType{fsType}
errs = provider.ValidatePod(pod)
assert.Empty(t, errs, "directly allowing volume expected no errors")
// now change the psp to allow any volumes and the pod should still validate
psp.Spec.Volumes = []policy.FSType{policy.All}
errs = provider.ValidatePod(pod)
if len(errs) != 0 {
t.Errorf("wildcard volume expected no errors for %s but got %v", fieldVal.Name, errs)
}
// now change the psp to allow any volumes and the pod should still validate
psp.Spec.Volumes = []policy.FSType{policy.All}
errs = provider.ValidatePod(pod)
assert.Empty(t, errs, "wildcard volume expected no errors")
})
}
}
@ -1351,10 +1305,10 @@ func TestAllowPrivilegeEscalation(t *testing.T) {
provider, err := NewSimpleProvider(psp, "namespace", NewSimpleStrategyFactory())
require.NoError(t, err)
err = provider.DefaultContainerSecurityContext(pod, &pod.Spec.Containers[0])
err = provider.MutatePod(pod)
require.NoError(t, err)
errs := provider.ValidateContainer(pod, &pod.Spec.Containers[0], field.NewPath(""))
errs := provider.ValidatePod(pod)
if test.expectErr {
assert.NotEmpty(t, errs, "expected validation error")
} else {

14
pkg/security/podsecuritypolicy/types.go
View File

@ -32,16 +32,12 @@ import (
// Provider provides the implementation to generate a new security
// context based on constraints or validate an existing security context against constraints.
type Provider interface {
// DefaultPodSecurityContext sets the default values of the required but not filled fields.
// It modifies the SecurityContext and annotations of the provided pod.
DefaultPodSecurityContext(pod *api.Pod) error
// DefaultContainerSecurityContext sets the default values of the required but not filled fields.
// It modifies the SecurityContext of the container and annotations of the pod.
DefaultContainerSecurityContext(pod *api.Pod, container *api.Container) error
// Ensure a pod is in compliance with the given constraints.
// MutatePod sets the default values of the required but not filled fields of the pod and all
// containers in the pod.
MutatePod(pod *api.Pod) error
// ValidatePod ensures a pod and all its containers are in compliance with the given constraints.
// ValidatePod MUST NOT mutate the pod.
ValidatePod(pod *api.Pod) field.ErrorList
// Ensure a container's SecurityContext is in compliance with the given constraints.
ValidateContainer(pod *api.Pod, container *api.Container, containerPath *field.Path) field.ErrorList
// Get the name of the PSP that this provider was initialized with.
GetPSPName() string
}

29
plugin/pkg/admission/security/podsecuritypolicy/admission.go
View File

@ -306,35 +306,14 @@ func (c *PodSecurityPolicyPlugin) computeSecurityContext(a admission.Attributes,
func assignSecurityContext(provider psp.Provider, pod *api.Pod) field.ErrorList {
errs := field.ErrorList{}
err := provider.DefaultPodSecurityContext(pod)
if err != nil {
errs = append(errs, field.Invalid(field.NewPath("spec", "securityContext"), pod.Spec.SecurityContext, err.Error()))
if err := provider.MutatePod(pod); err != nil {
// TODO(tallclair): MutatePod should return a field.ErrorList
errs = append(errs, field.Invalid(field.NewPath(""), pod, err.Error()))
}
errs = append(errs, provider.ValidatePod(pod)...)
for i := range pod.Spec.InitContainers {
err := provider.DefaultContainerSecurityContext(pod, &pod.Spec.InitContainers[i])
if err != nil {
errs = append(errs, field.Invalid(field.NewPath("spec", "initContainers").Index(i).Child("securityContext"), "", err.Error()))
continue
}
errs = append(errs, provider.ValidateContainer(pod, &pod.Spec.InitContainers[i], field.NewPath("spec", "initContainers").Index(i))...)
}
for i := range pod.Spec.Containers {
err := provider.DefaultContainerSecurityContext(pod, &pod.Spec.Containers[i])
if err != nil {
errs = append(errs, field.Invalid(field.NewPath("spec", "containers").Index(i).Child("securityContext"), "", err.Error()))
continue
}
errs = append(errs, provider.ValidateContainer(pod, &pod.Spec.Containers[i], field.NewPath("spec", "containers").Index(i))...)
}
if len(errs) > 0 {
return errs
}
return nil
return errs
}
// createProvidersFromPolicies creates providers from the constraints supplied.