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76 lines
2.6 KiB
Go
76 lines
2.6 KiB
Go
/*
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Copyright 2020 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 certificates
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import (
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"context"
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"strings"
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"k8s.io/apiserver/pkg/authentication/user"
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"k8s.io/apiserver/pkg/authorization/authorizer"
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"k8s.io/klog/v2"
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)
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// IsAuthorizedForSignerName returns true if 'info' is authorized to perform the given
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// 'verb' on the synthetic 'signers' resource with the given signerName.
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// If the user does not have permission to perform the 'verb' on the given signerName,
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// it will also perform an authorization check against {domain portion}/*, for example
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// `kubernetes.io/*`. This allows an entity to be granted permission to 'verb' on all
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// signerNames with a given 'domain portion'.
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func IsAuthorizedForSignerName(ctx context.Context, authz authorizer.Authorizer, info user.Info, verb, signerName string) bool {
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// First check if the user has explicit permission to 'verb' for the given signerName.
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attr := buildAttributes(info, verb, signerName)
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decision, reason, err := authz.Authorize(ctx, attr)
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switch {
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case err != nil:
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klog.V(3).Infof("cannot authorize %q %q for policy: %v,%v", verb, attr.GetName(), reason, err)
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case decision == authorizer.DecisionAllow:
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return true
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}
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// If not, check if the user has wildcard permissions to 'verb' for the domain portion of the signerName, e.g.
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// 'kubernetes.io/*'.
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attr = buildWildcardAttributes(info, verb, signerName)
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decision, reason, err = authz.Authorize(ctx, attr)
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switch {
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case err != nil:
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klog.V(3).Infof("cannot authorize %q %q for policy: %v,%v", verb, attr.GetName(), reason, err)
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case decision == authorizer.DecisionAllow:
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return true
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}
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return false
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}
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func buildAttributes(info user.Info, verb, signerName string) authorizer.Attributes {
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return authorizer.AttributesRecord{
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User: info,
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Verb: verb,
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Name: signerName,
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APIGroup: "certificates.k8s.io",
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APIVersion: "*",
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Resource: "signers",
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ResourceRequest: true,
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}
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}
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func buildWildcardAttributes(info user.Info, verb, signerName string) authorizer.Attributes {
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parts := strings.Split(signerName, "/")
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domain := parts[0]
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return buildAttributes(info, verb, domain+"/*")
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}
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