Merge pull request #99494 from enj/enj/i/not_after_ttl_hint

csr: add expirationSeconds field to control cert lifetime

Kubernetes-commit: 659c7e709f3b7f5f2a25e456525cd8747f2e68cc

applyconfigurations/certificates/v1/certificatesigningrequestspec.go

@@ -27,6 +27,7 @@ import (
 type CertificateSigningRequestSpecApplyConfiguration struct {
 	Request           []byte                   `json:"request,omitempty"`
 	SignerName        *string                  `json:"signerName,omitempty"`
+	ExpirationSeconds *int32                   `json:"expirationSeconds,omitempty"`
 	Usages            []v1.KeyUsage            `json:"usages,omitempty"`
 	Username          *string                  `json:"username,omitempty"`
 	UID               *string                  `json:"uid,omitempty"`
@@ -58,6 +59,14 @@ func (b *CertificateSigningRequestSpecApplyConfiguration) WithSignerName(value s
 	return b
 }
 
+// WithExpirationSeconds sets the ExpirationSeconds field in the declarative configuration to the given value
+// and returns the receiver, so that objects can be built by chaining "With" function invocations.
+// If called multiple times, the ExpirationSeconds field is set to the value of the last call.
+func (b *CertificateSigningRequestSpecApplyConfiguration) WithExpirationSeconds(value int32) *CertificateSigningRequestSpecApplyConfiguration {
+	b.ExpirationSeconds = &value
+	return b
+}
+
 // WithUsages adds the given value to the Usages field in the declarative configuration
 // and returns the receiver, so that objects can be build by chaining "With" function invocations.
 // If called multiple times, values provided by each call will be appended to the Usages field.

applyconfigurations/certificates/v1beta1/certificatesigningrequestspec.go

@@ -27,6 +27,7 @@ import (
 type CertificateSigningRequestSpecApplyConfiguration struct {
 	Request           []byte                        `json:"request,omitempty"`
 	SignerName        *string                       `json:"signerName,omitempty"`
+	ExpirationSeconds *int32                        `json:"expirationSeconds,omitempty"`
 	Usages            []v1beta1.KeyUsage            `json:"usages,omitempty"`
 	Username          *string                       `json:"username,omitempty"`
 	UID               *string                       `json:"uid,omitempty"`
@@ -58,6 +59,14 @@ func (b *CertificateSigningRequestSpecApplyConfiguration) WithSignerName(value s
 	return b
 }
 
+// WithExpirationSeconds sets the ExpirationSeconds field in the declarative configuration to the given value
+// and returns the receiver, so that objects can be built by chaining "With" function invocations.
+// If called multiple times, the ExpirationSeconds field is set to the value of the last call.
+func (b *CertificateSigningRequestSpecApplyConfiguration) WithExpirationSeconds(value int32) *CertificateSigningRequestSpecApplyConfiguration {
+	b.ExpirationSeconds = &value
+	return b
+}
+
 // WithUsages adds the given value to the Usages field in the declarative configuration
 // and returns the receiver, so that objects can be build by chaining "With" function invocations.
 // If called multiple times, values provided by each call will be appended to the Usages field.

applyconfigurations/internal/internal.go

@@ -2843,6 +2843,9 @@ var schemaYAML = typed.YAMLObject(`types:
 - name: io.k8s.api.certificates.v1.CertificateSigningRequestSpec
   map:
     fields:
+    - name: expirationSeconds
+      type:
+        scalar: numeric
     - name: extra
       type:
         map:
@@ -2939,6 +2942,9 @@ var schemaYAML = typed.YAMLObject(`types:
 - name: io.k8s.api.certificates.v1beta1.CertificateSigningRequestSpec
   map:
     fields:
+    - name: expirationSeconds
+      type:
+        scalar: numeric
     - name: extra
       type:
         map:

go.mod

@@ -30,7 +30,7 @@ require (
 	golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d
 	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
 	google.golang.org/protobuf v1.26.0
-	k8s.io/api v0.0.0-20210701054328-f75dde501d56
+	k8s.io/api v0.0.0-20210702094336-49e8721f8489
 	k8s.io/apimachinery v0.0.0-20210701054147-830375057167
 	k8s.io/klog/v2 v2.9.0
 	k8s.io/utils v0.0.0-20210521133846-da695404a2bc
@@ -39,6 +39,6 @@ require (
 )
 
 replace (
-	k8s.io/api => k8s.io/api v0.0.0-20210701054328-f75dde501d56
+	k8s.io/api => k8s.io/api v0.0.0-20210702094336-49e8721f8489
 	k8s.io/apimachinery => k8s.io/apimachinery v0.0.0-20210701054147-830375057167
 )

go.sum

@@ -444,8 +444,8 @@ honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-k8s.io/api v0.0.0-20210701054328-f75dde501d56 h1:D7+RjL9qHD5SvrWwSnT0NugysPfJAopsJphgGxpp+kU=
+k8s.io/api v0.0.0-20210702094336-49e8721f8489 h1:R+giJyPdlHfUvmzHBQ6tm2tlmxcZ2NWgkGSxLbQZ/ZM=
-k8s.io/api v0.0.0-20210701054328-f75dde501d56/go.mod h1:zoURDvOPW5UMFZr2YUU/sStjYnWSPt+x+MM4R94ATgQ=
+k8s.io/api v0.0.0-20210702094336-49e8721f8489/go.mod h1:zoURDvOPW5UMFZr2YUU/sStjYnWSPt+x+MM4R94ATgQ=
 k8s.io/apimachinery v0.0.0-20210701054147-830375057167 h1:fob/j8+uMBIVvyo+9bG7GvjFSj0LX3RNuSXW+RcUrwo=
 k8s.io/apimachinery v0.0.0-20210701054147-830375057167/go.mod h1:O3oNtNadZdeOMxHFVxOreoznohCpy0z6mocxbZr7oJ0=
 k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=

util/certificate/certificate_manager.go

@@ -88,6 +88,11 @@ type Config struct {
 	// SignerName is the name of the certificate signer that should sign certificates
 	// generated by the manager.
 	SignerName string
+	// RequestedCertificateLifetime is the requested lifetime length for certificates generated by the manager.
+	// Optional.
+	// This will set the spec.expirationSeconds field on the CSR.  Controlling the lifetime of
+	// the issued certificate is not guaranteed as the signer may choose to ignore the request.
+	RequestedCertificateLifetime *time.Duration
 	// Usages is the types of usages that certificates generated by the manager
 	// can be used for.
 	Usages []certificates.KeyUsage
@@ -186,6 +191,7 @@ type manager struct {
 
 	dynamicTemplate              bool
 	signerName                   string
+	requestedCertificateLifetime *time.Duration
 	usages                       []certificates.KeyUsage
 	forceRotation                bool
 
@@ -235,6 +241,7 @@ func NewManager(config *Config) (Manager, error) {
 		getTemplate:                  getTemplate,
 		dynamicTemplate:              config.GetTemplate != nil,
 		signerName:                   config.SignerName,
+		requestedCertificateLifetime: config.RequestedCertificateLifetime,
 		usages:                       config.Usages,
 		certStore:                    config.CertificateStore,
 		cert:                         cert,
@@ -459,7 +466,7 @@ func (m *manager) rotateCerts() (bool, error) {
 
 	// Call the Certificate Signing Request API to get a certificate for the
 	// new private key.
-	reqName, reqUID, err := csr.RequestCertificate(clientSet, csrPEM, "", m.signerName, m.usages, privateKey)
+	reqName, reqUID, err := csr.RequestCertificate(clientSet, csrPEM, "", m.signerName, m.requestedCertificateLifetime, m.usages, privateKey)
 	if err != nil {
 		utilruntime.HandleError(fmt.Errorf("%s: Failed while requesting a signed certificate from the control plane: %v", m.name, err))
 		if m.certificateRenewFailure != nil {

util/certificate/csr/csr.go

@@ -25,8 +25,6 @@ import (
 	"reflect"
 	"time"
 
-	"k8s.io/klog/v2"
-
 	certificatesv1 "k8s.io/api/certificates/v1"
 	certificatesv1beta1 "k8s.io/api/certificates/v1beta1"
 	"k8s.io/apimachinery/pkg/api/errors"
@@ -41,12 +39,16 @@ import (
 	"k8s.io/client-go/tools/cache"
 	watchtools "k8s.io/client-go/tools/watch"
 	certutil "k8s.io/client-go/util/cert"
+	"k8s.io/klog/v2"
+	"k8s.io/utils/pointer"
 )
 
 // RequestCertificate will either use an existing (if this process has run
 // before but not to completion) or create a certificate signing request using the
-// PEM encoded CSR and send it to API server.
+// PEM encoded CSR and send it to API server.  An optional requestedDuration may be passed
-func RequestCertificate(client clientset.Interface, csrData []byte, name string, signerName string, usages []certificatesv1.KeyUsage, privateKey interface{}) (reqName string, reqUID types.UID, err error) {
+// to set the spec.expirationSeconds field on the CSR to control the lifetime of the issued
+// certificate.  This is not guaranteed as the signer may choose to ignore the request.
+func RequestCertificate(client clientset.Interface, csrData []byte, name, signerName string, requestedDuration *time.Duration, usages []certificatesv1.KeyUsage, privateKey interface{}) (reqName string, reqUID types.UID, err error) {
 	csr := &certificatesv1.CertificateSigningRequest{
 		// Username, UID, Groups will be injected by API server.
 		TypeMeta: metav1.TypeMeta{Kind: "CertificateSigningRequest"},
@@ -62,6 +64,9 @@ func RequestCertificate(client clientset.Interface, csrData []byte, name string,
 	if len(csr.Name) == 0 {
 		csr.GenerateName = "csr-"
 	}
+	if requestedDuration != nil {
+		csr.Spec.ExpirationSeconds = DurationToExpirationSeconds(*requestedDuration)
+	}
 
 	reqName, reqUID, err = create(client, csr)
 	switch {
@@ -85,6 +90,14 @@ func RequestCertificate(client clientset.Interface, csrData []byte, name string,
 	}
 }
 
+func DurationToExpirationSeconds(duration time.Duration) *int32 {
+	return pointer.Int32(int32(duration / time.Second))
+}
+
+func ExpirationSecondsToDuration(expirationSeconds int32) time.Duration {
+	return time.Duration(expirationSeconds) * time.Second
+}
+
 func get(client clientset.Interface, name string) (*certificatesv1.CertificateSigningRequest, error) {
 	v1req, v1err := client.CertificatesV1().CertificateSigningRequests().Get(context.TODO(), name, metav1.GetOptions{})
 	if v1err == nil || !apierrors.IsNotFound(v1err) {