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Aggregate all the errors when the shared certs are validated

Browse Source 
Instead of the individual error and return, it's better to aggregate all
the errors so that we can fix them all at once.

Take the chance to fix some comments, since kubeadm are not checking that
the certs are equal across controlplane.

Signed-off-by: Dave Chen <dave.chen@arm.com>
This commit is contained in:
Dave Chen 2021-11-01 17:25:43 +08:00
parent 6ae9d088c4
commit c85fb0e6ac
3 changed files with 40 additions and 24 deletions
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2
cmd/kubeadm/app/cmd/phases/join/preflight.go
View File

@ -147,7 +147,7 @@ func checkIfReadyForAdditionalControlPlane(initConfiguration *kubeadmapi.Cluster
}
if !hasCertificateKey {
// checks if the certificates that must be equal across controlplane instances are provided
// checks if the certificates are provided and are still valid, not expired yet.
if ret, err := certs.SharedCertificateExists(initConfiguration); !ret {
return err
}

21
cmd/kubeadm/app/phases/certs/certs.go
View File

@ -26,6 +26,7 @@ import (
"github.com/pkg/errors"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/client-go/util/keyutil"
"k8s.io/klog/v2"
@ -304,30 +305,32 @@ type certKeyLocation struct {
uxName string
}
// SharedCertificateExists verifies if the shared certificates - the certificates that must be
// equal across control-plane nodes: ca.key, ca.crt, sa.key, sa.pub + etcd/ca.key, etcd/ca.crt if local/stacked etcd
// Missing keys are non-fatal and produce warnings.
// SharedCertificateExists verifies if the shared certificates exist and are still valid - the certificates must be
// equal across control-plane nodes: ca.key, ca.crt, sa.key, sa.pub, front-proxy-ca.key, front-proxy-ca.crt and etcd/ca.key, etcd/ca.crt if local/stacked etcd
// Missing private keys of CA are non-fatal and produce warnings.
func SharedCertificateExists(cfg *kubeadmapi.ClusterConfiguration) (bool, error) {
var errs []error
if err := validateCACertAndKey(certKeyLocation{cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName, "", "CA"}); err != nil {
return false, err
errs = append(errs, err)
}
if err := validatePrivatePublicKey(certKeyLocation{cfg.CertificatesDir, "", kubeadmconstants.ServiceAccountKeyBaseName, "service account"}); err != nil {
return false, err
errs = append(errs, err)
}
if err := validateCACertAndKey(certKeyLocation{cfg.CertificatesDir, kubeadmconstants.FrontProxyCACertAndKeyBaseName, "", "front-proxy CA"}); err != nil {
return false, err
errs = append(errs, err)
}
// in case of local/stacked etcd
if cfg.Etcd.External == nil {
if err := validateCACertAndKey(certKeyLocation{cfg.CertificatesDir, kubeadmconstants.EtcdCACertAndKeyBaseName, "", "etcd CA"}); err != nil {
return false, err
errs = append(errs, err)
}
}
if len(errs) != 0 {
return false, utilerrors.NewAggregate(errs)
}
return true, nil
}

41
cmd/kubeadm/app/phases/certs/certs_test.go
View File

@ -31,6 +31,7 @@ import (
"github.com/pkg/errors"
"github.com/stretchr/testify/assert"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
certutil "k8s.io/client-go/util/cert"
"k8s.io/client-go/util/keyutil"
@ -373,9 +374,9 @@ func TestSharedCertificateExists(t *testing.T) {
publicKey := key.Public()
var tests = []struct {
name string
files certstestutil.PKIFiles
expectedError bool
name string
files certstestutil.PKIFiles
expectedErrors int
}{
{
name: "success",
@ -401,7 +402,7 @@ func TestSharedCertificateExists(t *testing.T) {
"etcd/ca.crt": caCert,
"etcd/ca.key": caKey,
},
expectedError: true,
expectedErrors: 1,
},
{
name: "missing ca.key",
@ -414,7 +415,6 @@ func TestSharedCertificateExists(t *testing.T) {
"etcd/ca.crt": caCert,
"etcd/ca.key": caKey,
},
expectedError: false,
},
{
name: "missing sa.key",
@ -427,7 +427,7 @@ func TestSharedCertificateExists(t *testing.T) {
"etcd/ca.crt": caCert,
"etcd/ca.key": caKey,
},
expectedError: true,
expectedErrors: 1,
},
{
name: "missing front-proxy.crt",
@ -440,20 +440,32 @@ func TestSharedCertificateExists(t *testing.T) {
"etcd/ca.crt": caCert,
"etcd/ca.key": caKey,
},
expectedError: true,
expectedErrors: 1,
},
{
name: "missing etcd/ca.crt",
files: certstestutil.PKIFiles{
"ca.crt": caCert,
"ca.key": caKey,
"front-proxy-ca.crt": caCert,
"front-proxy-ca.key": caKey,
"sa.pub": publicKey,
"sa.key": key,
"etcd/ca.crt": caCert,
"etcd/ca.key": caKey,
},
expectedError: true,
expectedErrors: 1,
},
{
name: "missing multiple certs (ca.crt and etcd/ca.crt)",
files: certstestutil.PKIFiles{
"ca.key": caKey,
"front-proxy-ca.crt": caCert,
"front-proxy-ca.key": caKey,
"sa.pub": publicKey,
"sa.key": key,
"etcd/ca.key": caKey,
},
expectedErrors: 2,
},
}
@ -472,12 +484,13 @@ func TestSharedCertificateExists(t *testing.T) {
// executes create func
ret, err := SharedCertificateExists(cfg)
switch {
case !test.expectedError && err != nil:
t.Errorf("error SharedCertificateExists failed when not expected to fail: %v", err)
case test.expectedError && err == nil:
t.Errorf("error SharedCertificateExists didn't failed when expected")
case err != nil:
if agg, ok := err.(utilerrors.Aggregate); ok && len(agg.Errors()) != test.expectedErrors {
t.Errorf("SharedCertificateExists didn't fail with the expected number of errors, expected: %v, got: %v", test.expectedErrors, len(agg.Errors()))
}
case err == nil && test.expectedErrors != 0:
t.Errorf("error SharedCertificateExists didn't fail when expected")
case ret != (err == nil):
t.Errorf("error SharedCertificateExists returned %v when expected to return %v", ret, err == nil)
}