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Restore "Make bootstrap client cert loading part of rotation""

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This reverts the revert of commit 34642222676640b3c1dd255cc453000f2743ccde.

Kubernetes-commit: 486577df17570b321a91b223901d7e4fdbb63519
This commit is contained in:
Clayton Coleman 2018-11-17 13:44:58 -05:00 committed by Kubernetes Publisher
parent b2d26f2856
commit 96e95840d4
2 changed files with 141 additions and 64 deletions
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98
util/certificate/certificate_manager.go
View File

@ -48,11 +48,10 @@ var certificateWaitBackoff = wait.Backoff{Duration: 30 * time.Second, Steps: 4,
// manager. In the background it communicates with the API server to get new
// certificates for certificates about to expire.
type Manager interface {
// CertificateSigningRequestClient sets the client interface that is used for
// signing new certificates generated as part of rotation.
SetCertificateSigningRequestClient(certificatesclient.CertificateSigningRequestInterface) error
// Start the API server status sync loop.
Start()
// Stop the cert manager loop.
Stop()
// Current returns the currently selected certificate from the
// certificate manager, as well as the associated certificate and key data
// in PEM format.
@ -67,11 +66,11 @@ type Manager interface {
// Config is the set of configuration parameters available for a new Manager.
type Config struct {
// CertificateSigningRequestClient will be used for signing new certificate
// requests generated when a key rotation occurs. It must be set either at
// initialization or by using CertificateSigningRequestClient before
// Manager.Start() is called.
CertificateSigningRequestClient certificatesclient.CertificateSigningRequestInterface
// ClientFn will be used to create a client for
// signing new certificate requests generated when a key rotation occurs.
// It must be set at initialization. The function will never be invoked
// in parallel. It is passed the current client certificate if one exists.
ClientFn CSRClientFunc
// Template is the CertificateRequest that will be used as a template for
// generating certificate signing requests for all new keys generated as
// part of rotation. It follows the same rules as the template parameter of
@ -141,21 +140,34 @@ type Gauge interface {
// NoCertKeyError indicates there is no cert/key currently available.
type NoCertKeyError string
// CSRClientFunc returns a new client for requesting CSRs. It passes the
// current certificate if one is available and valid.
type CSRClientFunc func(current *tls.Certificate) (certificatesclient.CertificateSigningRequestInterface, error)
func (e *NoCertKeyError) Error() string { return string(*e) }
type manager struct {
certSigningRequestClient certificatesclient.CertificateSigningRequestInterface
getTemplate func() *x509.CertificateRequest
lastRequestLock sync.Mutex
lastRequest *x509.CertificateRequest
dynamicTemplate bool
usages []certificates.KeyUsage
forceRotation bool
certStore Store
certificateExpiration Gauge
// the following variables must only be accessed under certAccessLock
certAccessLock sync.RWMutex
cert *tls.Certificate
forceRotation bool
certificateExpiration Gauge
serverHealth bool
// the clientFn must only be accessed under the clientAccessLock
clientAccessLock sync.Mutex
clientFn CSRClientFunc
stopCh chan struct{}
stopped bool
}
// NewManager returns a new certificate manager. A certificate manager is
@ -176,7 +188,8 @@ func NewManager(config *Config) (Manager, error) {
}
m := manager{
certSigningRequestClient: config.CertificateSigningRequestClient,
stopCh: make(chan struct{}),
clientFn: config.ClientFn,
getTemplate: getTemplate,
dynamicTemplate: config.GetTemplate != nil,
usages: config.Usages,
@ -192,10 +205,14 @@ func NewManager(config *Config) (Manager, error) {
// Current returns the currently selected certificate from the certificate
// manager. This can be nil if the manager was initialized without a
// certificate and has not yet received one from the
// CertificateSigningRequestClient.
// CertificateSigningRequestClient, or if the current cert has expired.
func (m *manager) Current() *tls.Certificate {
m.certAccessLock.RLock()
defer m.certAccessLock.RUnlock()
if m.cert != nil && m.cert.Leaf != nil && time.Now().After(m.cert.Leaf.NotAfter) {
klog.V(2).Infof("Current certificate is expired.")
return nil
}
return m.cert
}
@ -207,18 +224,15 @@ func (m *manager) ServerHealthy() bool {
return m.serverHealth
}
// SetCertificateSigningRequestClient sets the client interface that is used
// for signing new certificates generated as part of rotation. It must be
// called before Start() and can not be used to change the
// CertificateSigningRequestClient that has already been set. This method is to
// support the one specific scenario where the CertificateSigningRequestClient
// uses the CertificateManager.
func (m *manager) SetCertificateSigningRequestClient(certSigningRequestClient certificatesclient.CertificateSigningRequestInterface) error {
if m.certSigningRequestClient == nil {
m.certSigningRequestClient = certSigningRequestClient
return nil
// Stop terminates the manager.
func (m *manager) Stop() {
m.clientAccessLock.Lock()
defer m.clientAccessLock.Unlock()
if m.stopped {
return
}
return fmt.Errorf("property CertificateSigningRequestClient is already set")
close(m.stopCh)
m.stopped = true
}
// Start will start the background work of rotating the certificates.
@ -226,7 +240,7 @@ func (m *manager) Start() {
// Certificate rotation depends on access to the API server certificate
// signing API, so don't start the certificate manager if we don't have a
// client.
if m.certSigningRequestClient == nil {
if m.clientFn == nil {
klog.V(2).Infof("Certificate rotation is not enabled, no connection to the apiserver.")
return
}
@ -234,7 +248,7 @@ func (m *manager) Start() {
klog.V(2).Infof("Certificate rotation is enabled.")
templateChanged := make(chan struct{})
go wait.Forever(func() {
go wait.Until(func() {
deadline := m.nextRotationDeadline()
if sleepInterval := deadline.Sub(time.Now()); sleepInterval > 0 {
klog.V(2).Infof("Waiting %v for next certificate rotation", sleepInterval)
@ -269,17 +283,17 @@ func (m *manager) Start() {
utilruntime.HandleError(fmt.Errorf("Reached backoff limit, still unable to rotate certs: %v", err))
wait.PollInfinite(32*time.Second, m.rotateCerts)
}
}, time.Second)
}, time.Second, m.stopCh)
if m.dynamicTemplate {
go wait.Forever(func() {
go wait.Until(func() {
// check if the current template matches what we last requested
if !m.certSatisfiesTemplate() && !reflect.DeepEqual(m.getLastRequest(), m.getTemplate()) {
// if the template is different, queue up an interrupt of the rotation deadline loop.
// if we've requested a CSR that matches the new template by the time the interrupt is handled, the interrupt is disregarded.
templateChanged <- struct{}{}
}
}, time.Second)
}, time.Second, m.stopCh)
}
}
@ -327,11 +341,26 @@ func getCurrentCertificateOrBootstrap(
return &bootstrapCert, true, nil
}
func (m *manager) getClient() (certificatesclient.CertificateSigningRequestInterface, error) {
current := m.Current()
m.clientAccessLock.Lock()
defer m.clientAccessLock.Unlock()
return m.clientFn(current)
}
// RotateCerts is exposed for testing only and is not a part of the public interface.
// Returns true if it changed the cert, false otherwise. Error is only returned in
// exceptional cases.
func (m *manager) RotateCerts() (bool, error) {
return m.rotateCerts()
}
// rotateCerts attempts to request a client cert from the server, wait a reasonable
// period of time for it to be signed, and then update the cert on disk. If it cannot
// retrieve a cert, it will return false. It will only return error in exceptional cases.
// This method also keeps track of "server health" by interpreting the responses it gets
// from the server on the various calls it makes.
// TODO: return errors, have callers handle and log them correctly
func (m *manager) rotateCerts() (bool, error) {
klog.V(2).Infof("Rotating certificates")
@ -341,9 +370,16 @@ func (m *manager) rotateCerts() (bool, error) {
return false, nil
}
// request the client each time
client, err := m.getClient()
if err != nil {
utilruntime.HandleError(fmt.Errorf("Unable to load a client to request certificates: %v", err))
return false, nil
}
// Call the Certificate Signing Request API to get a certificate for the
// new private key.
req, err := csr.RequestCertificate(m.certSigningRequestClient, csrPEM, "", m.usages, privateKey)
req, err := csr.RequestCertificate(client, csrPEM, "", m.usages, privateKey)
if err != nil {
utilruntime.HandleError(fmt.Errorf("Failed while requesting a signed certificate from the master: %v", err))
return false, m.updateServerError(err)
@ -359,7 +395,7 @@ func (m *manager) rotateCerts() (bool, error) {
var crtPEM []byte
watchDuration := time.Minute
if err := wait.ExponentialBackoff(certificateWaitBackoff, func() (bool, error) {
data, err := csr.WaitForCertificate(m.certSigningRequestClient, req, watchDuration)
data, err := csr.WaitForCertificate(client, req, watchDuration)
switch {
case err == nil:
crtPEM = data

61
util/certificate/certificate_manager_test.go
View File

@ -60,6 +60,23 @@ iQIgZX08DA8VfvcA5/Xj1Zjdey9FVY6POLXen6RPiabE97UCICp6eUW7ht+2jjar
e35EltCRCjoejRHTuN9TC0uCoVipAiAXaJIx/Q47vGwiw6Y8KXsNU6y54gTbOSxX
54LzHNk/+Q==
-----END RSA PRIVATE KEY-----`)
var expiredStoreCertData = newCertificateData(`-----BEGIN CERTIFICATE-----
MIIBFzCBwgIJALhygXnxXmN1MA0GCSqGSIb3DQEBCwUAMBMxETAPBgNVBAMMCGhv
c3QtMTIzMB4XDTE4MTEwNDIzNTc1NFoXDTE4MTEwNTIzNTc1NFowEzERMA8GA1UE
AwwIaG9zdC0xMjMwXDANBgkqhkiG9w0BAQEFAANLADBIAkEAtBMa7NWpv3BVlKTC
PGO/LEsguKqWHBtKzweMY2CVtAL1rQm913huhxF9w+ai76KQ3MHK5IVnLJjYYA5M
zP2H5QIDAQABMA0GCSqGSIb3DQEBCwUAA0EAN2DPFUtCzqnidL+5nh+46Sk6dkMI
T5DD11UuuIjZusKvThsHKVCIsyJ2bDo7cTbI+/nklLRP+FcC2wESFUgXbA==
-----END CERTIFICATE-----`, `-----BEGIN RSA PRIVATE KEY-----
MIIBUwIBADANBgkqhkiG9w0BAQEFAASCAT0wggE5AgEAAkEAtBMa7NWpv3BVlKTC
PGO/LEsguKqWHBtKzweMY2CVtAL1rQm913huhxF9w+ai76KQ3MHK5IVnLJjYYA5M
zP2H5QIDAQABAkAS9BfXab3OKpK3bIgNNyp+DQJKrZnTJ4Q+OjsqkpXvNltPJosf
G8GsiKu/vAt4HGqI3eU77NvRI+mL4MnHRmXBAiEA3qM4FAtKSRBbcJzPxxLEUSwg
XSCcosCktbkXvpYrS30CIQDPDxgqlwDEJQ0uKuHkZI38/SPWWqfUmkecwlbpXABK
iQIgZX08DA8VfvcA5/Xj1Zjdey9FVY6POLXen6RPiabE97UCICp6eUW7ht+2jjar
e35EltCRCjoejRHTuN9TC0uCoVipAiAXaJIx/Q47vGwiw6Y8KXsNU6y54gTbOSxX
54LzHNk/+Q==
-----END RSA PRIVATE KEY-----`)
var bootstrapCertData = newCertificateData(
`-----BEGIN CERTIFICATE-----
MIICRzCCAfGgAwIBAgIJANXr+UzRFq4TMA0GCSqGSIb3DQEBCwUAMH4xCzAJBgNV
@ -388,8 +405,8 @@ func TestRotateCertCreateCSRError(t *testing.T) {
},
getTemplate: func() *x509.CertificateRequest { return &x509.CertificateRequest{} },
usages: []certificates.KeyUsage{},
certSigningRequestClient: fakeClient{
failureType: createError,
clientFn: func(_ *tls.Certificate) (certificatesclient.CertificateSigningRequestInterface, error) {
return fakeClient{failureType: createError}, nil
},
}
@ -411,8 +428,8 @@ func TestRotateCertWaitingForResultError(t *testing.T) {
},
getTemplate: func() *x509.CertificateRequest { return &x509.CertificateRequest{} },
usages: []certificates.KeyUsage{},
certSigningRequestClient: fakeClient{
failureType: watchError,
clientFn: func(_ *tls.Certificate) (certificatesclient.CertificateSigningRequestInterface, error) {
return fakeClient{failureType: watchError}, nil
},
}
@ -598,6 +615,14 @@ func TestInitializeCertificateSigningRequestClient(t *testing.T) {
expectedCertBeforeStart: storeCertData,
expectedCertAfterStart: storeCertData,
},
{
description: "Current certificate expired, no bootstrap certificate",
storeCert: expiredStoreCertData,
bootstrapCert: nilCertificate,
apiCert: apiServerCertData,
expectedCertBeforeStart: nil,
expectedCertAfterStart: apiServerCertData,
},
}
for _, tc := range testCases {
@ -621,19 +646,25 @@ func TestInitializeCertificateSigningRequestClient(t *testing.T) {
CertificateStore: certificateStore,
BootstrapCertificatePEM: tc.bootstrapCert.certificatePEM,
BootstrapKeyPEM: tc.bootstrapCert.keyPEM,
ClientFn: func(_ *tls.Certificate) (certificatesclient.CertificateSigningRequestInterface, error) {
return &fakeClient{
certificatePEM: tc.apiCert.certificatePEM,
}, nil
},
})
if err != nil {
t.Errorf("Got %v, wanted no error.", err)
}
certificate := certificateManager.Current()
if tc.expectedCertBeforeStart == nil {
if certificate != nil {
t.Errorf("Expected certificate to be nil, was %s", certificate.Leaf.NotAfter)
}
} else {
if !certificatesEqual(certificate, tc.expectedCertBeforeStart.certificate) {
t.Errorf("Got %v, wanted %v", certificateString(certificate), certificateString(tc.expectedCertBeforeStart.certificate))
}
if err := certificateManager.SetCertificateSigningRequestClient(&fakeClient{
certificatePEM: tc.apiCert.certificatePEM,
}); err != nil {
t.Errorf("Got error %v, expected none.", err)
}
if m, ok := certificateManager.(*manager); !ok {
@ -649,6 +680,12 @@ func TestInitializeCertificateSigningRequestClient(t *testing.T) {
}
certificate = certificateManager.Current()
if tc.expectedCertAfterStart == nil {
if certificate != nil {
t.Errorf("Expected certificate to be nil, was %s", certificate.Leaf.NotAfter)
}
return
}
if !certificatesEqual(certificate, tc.expectedCertAfterStart.certificate) {
t.Errorf("Got %v, wanted %v", certificateString(certificate), certificateString(tc.expectedCertAfterStart.certificate))
}
@ -721,8 +758,10 @@ func TestInitializeOtherRESTClients(t *testing.T) {
CertificateStore: certificateStore,
BootstrapCertificatePEM: tc.bootstrapCert.certificatePEM,
BootstrapKeyPEM: tc.bootstrapCert.keyPEM,
CertificateSigningRequestClient: &fakeClient{
ClientFn: func(_ *tls.Certificate) (certificatesclient.CertificateSigningRequestInterface, error) {
return &fakeClient{
certificatePEM: tc.apiCert.certificatePEM,
}, nil
},
})
if err != nil {
@ -873,10 +912,12 @@ func TestServerHealth(t *testing.T) {
CertificateStore: certificateStore,
BootstrapCertificatePEM: tc.bootstrapCert.certificatePEM,
BootstrapKeyPEM: tc.bootstrapCert.keyPEM,
CertificateSigningRequestClient: &fakeClient{
ClientFn: func(_ *tls.Certificate) (certificatesclient.CertificateSigningRequestInterface, error) {
return &fakeClient{
certificatePEM: tc.apiCert.certificatePEM,
failureType: tc.failureType,
err: tc.clientErr,
}, nil
},
})
if err != nil {