87 lines
2.8 KiB
Go
87 lines
2.8 KiB
Go
/*
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Copyright 2021 The cert-manager 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 pki
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import (
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"crypto/x509"
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"fmt"
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"time"
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certificatesv1 "k8s.io/api/certificates/v1"
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apiutil "github.com/cert-manager/cert-manager/pkg/api/util"
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cmapi "github.com/cert-manager/cert-manager/pkg/apis/certmanager/v1"
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experimentalapi "github.com/cert-manager/cert-manager/pkg/apis/experimental/v1alpha1"
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)
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// DurationFromCertificateSigningRequest returns the duration that the user may
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// have requested using the annotation
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// "experimental.cert-manager.io/request-duration" or via the CSR
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// spec.expirationSeconds field (the annotation is preferred since it predates
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// the field which is only available in Kubernetes v1.22+).
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// Returns the cert-manager default certificate duration when the user hasn't
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// provided the annotation or spec.expirationSeconds.
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func DurationFromCertificateSigningRequest(csr *certificatesv1.CertificateSigningRequest) (time.Duration, error) {
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requestedDuration, ok := csr.Annotations[experimentalapi.CertificateSigningRequestDurationAnnotationKey]
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if !ok {
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if csr.Spec.ExpirationSeconds != nil {
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return time.Duration(*csr.Spec.ExpirationSeconds) * time.Second, nil
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}
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// The user may not have set a duration annotation. Use the default
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// duration in this case.
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return cmapi.DefaultCertificateDuration, nil
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}
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duration, err := time.ParseDuration(requestedDuration)
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if err != nil {
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return -1, fmt.Errorf("failed to parse requested duration on annotation %q: %w",
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experimentalapi.CertificateSigningRequestDurationAnnotationKey, err)
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}
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return duration, nil
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}
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// BuildKeyUsagesKube returns a key usage and extended key usage of the x509 certificate
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func BuildKeyUsagesKube(usages []certificatesv1.KeyUsage) (x509.KeyUsage, []x509.ExtKeyUsage, error) {
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var unk []certificatesv1.KeyUsage
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if len(usages) == 0 {
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usages = []certificatesv1.KeyUsage{certificatesv1.UsageDigitalSignature, certificatesv1.UsageKeyEncipherment}
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}
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var (
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ku x509.KeyUsage
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eku []x509.ExtKeyUsage
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)
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for _, u := range usages {
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if kuse, ok := apiutil.KeyUsageTypeKube(u); ok {
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ku |= kuse
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} else if ekuse, ok := apiutil.ExtKeyUsageTypeKube(u); ok {
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eku = append(eku, ekuse)
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} else {
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unk = append(unk, u)
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}
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}
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if len(unk) > 0 {
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return -1, nil, fmt.Errorf("unknown key usages: %v", unk)
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}
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return ku, eku, nil
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}
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