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UPSTREAM: <carry>: make the PSA workload admission warnings honor the…
… changes that SCC will eventually make to the pod UPSTREAM: <carry>: pod-security: don't fail on SCC admission error If we propagate SCC admission error during pod extraction to PodSecurity admission, the latter will log the error instead of continuing with unmutated pod spec, and so we will not get a validation error in either the audit logs or as a warning. OpenShift-Rebase-Source: 6fe5c8f OpenShift-Rebase-Source: b4e019f UPSTREAM: <carry>: SCC pod extractor: assume default SA if SA is empty
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111 changes: 111 additions & 0 deletions
111
plugin/pkg/admission/security/podsecurity/patch_podspecextractor.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package podsecurity | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
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||
| 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" | ||
| saadmission "k8s.io/kubernetes/plugin/pkg/admission/serviceaccount" | ||
| podsecurityadmission "k8s.io/pod-security-admission/admission" | ||
| ) | ||
|
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| 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) | ||
| } | ||
|
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| 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() | ||
| } | ||
| if len(pod.Spec.ServiceAccountName) == 0 { | ||
| pod.Spec.ServiceAccountName = saadmission.DefaultServiceAccountName | ||
| } | ||
| internalPod := &core.Pod{} | ||
| if err := v1.Convert_v1_Pod_To_core_Pod(pod, internalPod, nil); err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
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| 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, nil | ||
| } | ||
|
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| if err := v1.Convert_core_Pod_To_v1_Pod(internalPod, pod, nil); err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
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| return podTemplateMeta, &pod.Spec, nil | ||
| } |