109 lines
4.0 KiB
Go
109 lines
4.0 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package generic
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import (
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"fmt"
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admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apiserver/pkg/admission"
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"k8s.io/apiserver/pkg/admission/plugin/policy/matching"
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)
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// Matcher is used for matching ValidatingAdmissionPolicy and ValidatingAdmissionPolicyBinding to attributes
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type PolicyMatcher interface {
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admission.InitializationValidator
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// DefinitionMatches says whether this policy definition matches the provided admission
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// resource request
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DefinitionMatches(a admission.Attributes, o admission.ObjectInterfaces, definition PolicyAccessor) (bool, schema.GroupVersionResource, schema.GroupVersionKind, error)
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// BindingMatches says whether this policy definition matches the provided admission
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// resource request
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BindingMatches(a admission.Attributes, o admission.ObjectInterfaces, binding BindingAccessor) (bool, error)
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// GetNamespace retrieves the Namespace resource by the given name. The name may be empty, in which case
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// GetNamespace must return nil, nil
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GetNamespace(name string) (*corev1.Namespace, error)
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}
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type matcher struct {
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Matcher *matching.Matcher
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}
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func NewPolicyMatcher(m *matching.Matcher) PolicyMatcher {
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return &matcher{
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Matcher: m,
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}
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}
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// ValidateInitialization checks if Matcher is initialized.
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func (c *matcher) ValidateInitialization() error {
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return c.Matcher.ValidateInitialization()
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}
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// DefinitionMatches returns whether this ValidatingAdmissionPolicy matches the provided admission resource request
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func (c *matcher) DefinitionMatches(a admission.Attributes, o admission.ObjectInterfaces, definition PolicyAccessor) (bool, schema.GroupVersionResource, schema.GroupVersionKind, error) {
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constraints := definition.GetMatchConstraints()
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if constraints == nil {
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return false, schema.GroupVersionResource{}, schema.GroupVersionKind{}, fmt.Errorf("policy contained no match constraints, a required field")
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}
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criteria := matchCriteria{constraints: constraints}
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return c.Matcher.Matches(a, o, &criteria)
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}
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// BindingMatches returns whether this ValidatingAdmissionPolicyBinding matches the provided admission resource request
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func (c *matcher) BindingMatches(a admission.Attributes, o admission.ObjectInterfaces, binding BindingAccessor) (bool, error) {
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matchResources := binding.GetMatchResources()
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if matchResources == nil {
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return true, nil
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}
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criteria := matchCriteria{constraints: matchResources}
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isMatch, _, _, err := c.Matcher.Matches(a, o, &criteria)
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return isMatch, err
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}
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func (c *matcher) GetNamespace(name string) (*corev1.Namespace, error) {
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return c.Matcher.GetNamespace(name)
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}
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var _ matching.MatchCriteria = &matchCriteria{}
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type matchCriteria struct {
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constraints *admissionregistrationv1.MatchResources
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}
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// GetParsedNamespaceSelector returns the converted LabelSelector which implements labels.Selector
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func (m *matchCriteria) GetParsedNamespaceSelector() (labels.Selector, error) {
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return metav1.LabelSelectorAsSelector(m.constraints.NamespaceSelector)
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}
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// GetParsedObjectSelector returns the converted LabelSelector which implements labels.Selector
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func (m *matchCriteria) GetParsedObjectSelector() (labels.Selector, error) {
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return metav1.LabelSelectorAsSelector(m.constraints.ObjectSelector)
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}
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// GetMatchResources returns the matchConstraints
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func (m *matchCriteria) GetMatchResources() admissionregistrationv1.MatchResources {
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return *m.constraints
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}
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