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UPSTREAM: <carry>: make the PSA workload admission warnings honor the…
… changes that SCC will eventually make to the pod
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107 changes: 107 additions & 0 deletions
107
plugin/pkg/admission/security/podsecurity/patch_podspecextractor.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package podsecurity | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| utilruntime "k8s.io/apimachinery/pkg/util/runtime" | ||
|
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||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/api/meta" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/runtime/schema" | ||
| "k8s.io/apiserver/pkg/admission" | ||
| "k8s.io/apiserver/pkg/authentication/serviceaccount" | ||
| "k8s.io/apiserver/pkg/authentication/user" | ||
| "k8s.io/klog/v2" | ||
| "k8s.io/kubernetes/pkg/apis/core" | ||
| v1 "k8s.io/kubernetes/pkg/apis/core/v1" | ||
| podsecurityadmission "k8s.io/pod-security-admission/admission" | ||
| ) | ||
|
|
||
| type SCCMutatingPodSpecExtractor struct { | ||
| sccAdmission admission.MutationInterface | ||
| delegate podsecurityadmission.PodSpecExtractor | ||
| } | ||
|
|
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| var SCCMutatingPodSpecExtractorInstance = &SCCMutatingPodSpecExtractor{ | ||
| delegate: podsecurityadmission.DefaultPodSpecExtractor{}, | ||
| } | ||
|
|
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| func (s *SCCMutatingPodSpecExtractor) SetSCCAdmission(sccAdmission admission.MutationInterface) { | ||
| s.sccAdmission = sccAdmission | ||
| } | ||
|
|
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| func (s *SCCMutatingPodSpecExtractor) HasPodSpec(gr schema.GroupResource) bool { | ||
| return s.delegate.HasPodSpec(gr) | ||
| } | ||
|
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| func (s *SCCMutatingPodSpecExtractor) ExtractPodSpec(obj runtime.Object) (*metav1.ObjectMeta, *corev1.PodSpec, error) { | ||
| if s.sccAdmission == nil { | ||
| return s.delegate.ExtractPodSpec(obj) | ||
| } | ||
|
|
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| switch obj := obj.(type) { | ||
| case *corev1.Pod: | ||
| return s.delegate.ExtractPodSpec(obj) | ||
| } | ||
|
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| podTemplateMeta, originalPodSpec, err := s.delegate.ExtractPodSpec(obj) | ||
| if err != nil { | ||
| return podTemplateMeta, originalPodSpec, err | ||
| } | ||
| if originalPodSpec == nil { | ||
| return nil, nil, nil | ||
| } | ||
| objectMeta, err := meta.Accessor(obj) | ||
| if err != nil { | ||
| return podTemplateMeta, originalPodSpec, fmt.Errorf("unable to get metadata for SCC mutation: %w", err) | ||
| } | ||
|
|
||
| pod := &corev1.Pod{ | ||
| ObjectMeta: *podTemplateMeta.DeepCopy(), | ||
| Spec: *originalPodSpec.DeepCopy(), | ||
| } | ||
| if len(pod.Namespace) == 0 { | ||
| pod.Namespace = objectMeta.GetNamespace() | ||
| } | ||
| if len(pod.Name) == 0 { | ||
| pod.Name = "pod-for-container-named-" + objectMeta.GetName() | ||
| } | ||
| internalPod := &core.Pod{} | ||
| if err := v1.Convert_v1_Pod_To_core_Pod(pod, internalPod, nil); err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| admissionAttributes := admission.NewAttributesRecord( | ||
| internalPod, | ||
| nil, | ||
| corev1.SchemeGroupVersion.WithKind("Pod"), | ||
| pod.Namespace, | ||
| pod.Name, | ||
| corev1.SchemeGroupVersion.WithResource("pods"), | ||
| "", | ||
| admission.Create, | ||
| nil, | ||
| false, | ||
| &user.DefaultInfo{ | ||
| Name: serviceaccount.MakeUsername(pod.Namespace, pod.Spec.ServiceAccountName), | ||
| UID: "", | ||
| Groups: append([]string{user.AllAuthenticated}, serviceaccount.MakeGroupNames(pod.Namespace)...), | ||
| Extra: nil, | ||
| }) | ||
| if err := s.sccAdmission.Admit(context.Background(), admissionAttributes, nil); err != nil { | ||
| // don't fail the request, just warn if SCC will fail | ||
| klog.ErrorS(err, "failed to mutate object for PSA using SCC") | ||
| utilruntime.HandleError(fmt.Errorf("failed to mutate object for PSA using SCC: %w", err)) | ||
| // TODO remove this failure we're causing when SCC fails, but for now we actually need to see our test fail because that was almost really bad. | ||
| return podTemplateMeta, originalPodSpec, err | ||
| } | ||
|
|
||
| if err := v1.Convert_core_Pod_To_v1_Pod(internalPod, pod, nil); err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| return podTemplateMeta, &pod.Spec, nil | ||
| } |