Use same lifetime for serving cert and CA cert

So that operators won't look at the lifetime of the CA cert and be
like, "wtf, why does the serving cert have the lifetime that I
specified, but its CA cert is valid for 100 years".

Signed-off-by: Andrew Keesler <akeesler@vmware.com>

internal/certauthority/certauthority.go

@@ -85,11 +85,13 @@ func Load(certPEM string, keyPEM string) (*CA, error) {
 	}, nil
 }
 
-// New generates a fresh certificate authority with the given subject.
-func New(subject pkix.Name) (*CA, error) { return newInternal(subject, secureEnv()) }
+// New generates a fresh certificate authority with the given subject and ttl.
+func New(subject pkix.Name, ttl time.Duration) (*CA, error) {
+	return newInternal(subject, ttl, secureEnv())
+}
 
 // newInternal is the internal guts of New, broken out for easier testing.
-func newInternal(subject pkix.Name, env env) (*CA, error) {
+func newInternal(subject pkix.Name, ttl time.Duration, env env) (*CA, error) {
 	ca := CA{env: env}
 	// Generate a random serial for the CA
 	serialNumber, err := randomSerial(env.serialRNG)
@@ -104,10 +106,10 @@ func newInternal(subject pkix.Name, env env) (*CA, error) {
 	}
 	ca.signer = privateKey
 
-	// Make a CA certificate valid for 100 years and backdated by some amount.
+	// Make a CA certificate valid for some ttl and backdated by some amount.
 	now := env.clock()
 	notBefore := now.Add(-certBackdate)
-	notAfter := now.Add(24 * time.Hour * 365 * 100)
+	notAfter := now.Add(ttl)
 
 	// Create CA cert template
 	caTemplate := x509.Certificate{

internal/certauthority/certauthority_test.go

@@ -86,7 +86,8 @@ func TestLoad(t *testing.T) {
 }
 
 func TestNew(t *testing.T) {
-	got, err := New(pkix.Name{CommonName: "Test CA"})
+	now := time.Now()
+	got, err := New(pkix.Name{CommonName: "Test CA"}, time.Minute)
 	require.NoError(t, err)
 	require.NotNil(t, got)
 
@@ -94,6 +95,8 @@ func TestNew(t *testing.T) {
 	caCert, err := x509.ParseCertificate(got.caCertBytes)
 	require.NoError(t, err)
 	require.Equal(t, "Test CA", caCert.Subject.CommonName)
+	require.WithinDuration(t, now.Add(-5*time.Minute), caCert.NotBefore, 10*time.Second)
+	require.WithinDuration(t, now.Add(time.Minute), caCert.NotAfter, 10*time.Second)
 }
 
 func TestNewInternal(t *testing.T) {
@@ -101,6 +104,7 @@ func TestNewInternal(t *testing.T) {
 
 	tests := []struct {
 		name           string
+		ttl            time.Duration
 		env            env
 		wantErr        string
 		wantCommonName string
@@ -137,6 +141,7 @@ func TestNewInternal(t *testing.T) {
 		},
 		{
 			name: "success",
+			ttl:  time.Minute,
 			env: env{
 				serialRNG:  strings.NewReader(strings.Repeat("x", 64)),
 				keygenRNG:  strings.NewReader(strings.Repeat("y", 64)),
@@ -144,14 +149,14 @@ func TestNewInternal(t *testing.T) {
 				clock:      func() time.Time { return now },
 			},
 			wantCommonName: "Test CA",
-			wantNotAfter:   now.Add(100 * 365 * 24 * time.Hour),
+			wantNotAfter:   now.Add(time.Minute),
 			wantNotBefore:  now.Add(-5 * time.Minute),
 		},
 	}
 	for _, tt := range tests {
 		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
-			got, err := newInternal(pkix.Name{CommonName: "Test CA"}, tt.env)
+			got, err := newInternal(pkix.Name{CommonName: "Test CA"}, tt.ttl, tt.env)
 			if tt.wantErr != "" {
 				require.EqualError(t, err, tt.wantErr)
 				require.Nil(t, got)

internal/controller/apicerts/certs_manager.go

@@ -37,8 +37,8 @@ type certsManagerController struct {
 	aggregatorClient aggregatorclient.Interface
 	secretInformer   corev1informers.SecretInformer
 
-	// certDuration is the lifetime of the serving certificate that this
-	// controller will use when issuing the serving certificate.
+	// certDuration is the lifetime of both the serving certificate and its CA
+	// certificate that this controller will use when issuing the certificates.
 	certDuration time.Duration
 }
 
@@ -88,7 +88,7 @@ func (c *certsManagerController) Sync(ctx controller.Context) error {
 	}
 
 	// Create a CA.
-	aggregatedAPIServerCA, err := certauthority.New(pkix.Name{CommonName: "Pinniped CA"})
+	aggregatedAPIServerCA, err := certauthority.New(pkix.Name{CommonName: "Pinniped CA"}, c.certDuration)
 	if err != nil {
 		return fmt.Errorf("could not initialize CA: %w", err)
 	}

internal/controller/apicerts/certs_manager_test.go

@@ -221,6 +221,10 @@ func TestManagerControllerSync(t *testing.T) {
 					r.NotEmpty(actualPrivateKey)
 					r.NotEmpty(actualCertChain)
 
+					// Validate the created CA's lifetime.
+					validCACert := testutil.ValidateCertificate(t, actualCACert, actualCACert)
+					validCACert.RequireLifetime(time.Now(), time.Now().Add(certDuration), 6*time.Minute)
+
 					// Validate the created cert using the CA, and also validate the cert's hostname
 					validCert := testutil.ValidateCertificate(t, actualCACert, actualCertChain)
 					validCert.RequireDNSName("pinniped-api." + installedInNamespace + ".svc")

pkg/config/api/types.go

@@ -45,7 +45,8 @@ type APIConfigSpec struct {
 type ServingCertificateConfigSpec struct {
 	// DurationSeconds is the validity period, in seconds, of the API serving
 	// certificate. By default, the serving certificate is issued for 31536000
-	// seconds (1 year).
+	// seconds (1 year). This value is also used for the serving certificate's
+	// CA certificate.
 	DurationSeconds *int64 `json:"durationSeconds,omitempty"`
 
 	// RenewBeforeSeconds is the period of time, in seconds, that pinniped will