93 lines
2.7 KiB
Go
93 lines
2.7 KiB
Go
/*
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Copyright 2024 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 metrics
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import (
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"context"
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"sync"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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"k8s.io/component-base/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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)
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const (
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namespace = "apiserver"
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subsystem = "authorization"
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)
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var (
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authorizationDecisionsTotal = metrics.NewCounterVec(
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&metrics.CounterOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "decisions_total",
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Help: "Total number of terminal decisions made by an authorizer split by authorizer type, name, and decision.",
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StabilityLevel: metrics.ALPHA,
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},
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[]string{"type", "name", "decision"},
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)
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)
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var registerMetrics sync.Once
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func RegisterMetrics() {
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registerMetrics.Do(func() {
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legacyregistry.MustRegister(authorizationDecisionsTotal)
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})
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}
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func ResetMetricsForTest() {
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authorizationDecisionsTotal.Reset()
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}
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func RecordAuthorizationDecision(authorizerType, authorizerName, decision string) {
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authorizationDecisionsTotal.WithLabelValues(authorizerType, authorizerName, decision).Inc()
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}
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func InstrumentedAuthorizer(authorizerType string, authorizerName string, delegate authorizer.Authorizer) authorizer.Authorizer {
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RegisterMetrics()
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return &instrumentedAuthorizer{
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authorizerType: string(authorizerType),
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authorizerName: authorizerName,
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delegate: delegate,
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}
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}
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type instrumentedAuthorizer struct {
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authorizerType string
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authorizerName string
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delegate authorizer.Authorizer
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}
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func (a *instrumentedAuthorizer) Authorize(ctx context.Context, attributes authorizer.Attributes) (authorizer.Decision, string, error) {
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decision, reason, err := a.delegate.Authorize(ctx, attributes)
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switch decision {
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case authorizer.DecisionNoOpinion:
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// non-terminal, not reported
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case authorizer.DecisionAllow:
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// matches SubjectAccessReview status.allowed field name
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RecordAuthorizationDecision(a.authorizerType, a.authorizerName, "allowed")
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case authorizer.DecisionDeny:
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// matches SubjectAccessReview status.denied field name
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RecordAuthorizationDecision(a.authorizerType, a.authorizerName, "denied")
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default:
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RecordAuthorizationDecision(a.authorizerType, a.authorizerName, "unknown")
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}
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return decision, reason, err
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}
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