djpbessems/ContainerImage.Pinniped
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specify the container name when fetching keys from kube cert agent pod

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Avoid errors seen when the cluster has been configured to automatically
inject additional sidecar containers into every pod.
This commit is contained in:
Ryan Richard 2023-09-18 09:19:57 -07:00
parent 0e7ef1637d
commit 4b4cc93ae7
6 changed files with 27 additions and 23 deletions
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6
internal/controller/kubecertagent/kubecertagent.go
View File

@ -69,6 +69,8 @@ const (
ClusterInfoNamespace = "kube-public"
clusterInfoName = "cluster-info"
clusterInfoConfigMapKey = "kubeconfig"
agentPodContainerName = "sleeper"
)
// AgentConfig is the configuration for the kube-cert-agent controller.
@ -348,7 +350,7 @@ func (c *agentController) loadSigningKey(ctx context.Context, agentPod *corev1.P
}
// Exec into the agent pod and cat out the certificate and the key.
outputJSON, err := c.executor.Exec(ctx, agentPod.Namespace, agentPod.Name, "pinniped-concierge-kube-cert-agent", "print")
outputJSON, err := c.executor.Exec(ctx, agentPod.Namespace, agentPod.Name, agentPodContainerName, "pinniped-concierge-kube-cert-agent", "print")
if err != nil {
return fmt.Errorf("could not exec into agent pod %s/%s: %w", agentPod.Namespace, agentPod.Name, err)
}
@ -532,7 +534,7 @@ func (c *agentController) newAgentDeployment(controllerManagerPod *corev1.Pod) *
ImagePullSecrets: imagePullSecrets,
Containers: []corev1.Container{
{
Name: "sleeper",
Name: agentPodContainerName,
Image: c.cfg.ContainerImage,
ImagePullPolicy: corev1.PullIfNotPresent,
Command: []string{"pinniped-concierge-kube-cert-agent", "sleep"},

12
internal/controller/kubecertagent/kubecertagent_test.go
View File

@ -229,7 +229,7 @@ func TestAgentController(t *testing.T) {
}
mockExecSucceeds := func(t *testing.T, executor *mocks.MockPodCommandExecutorMockRecorder, dynamicCert *mocks.MockDynamicCertPrivateMockRecorder, execCache *cache.Expiring) {
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "pinniped-concierge-kube-cert-agent", "print").
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "sleeper", "pinniped-concierge-kube-cert-agent", "print").
Return(`{"tls.crt": "dGVzdC1jZXJ0", "tls.key": "dGVzdC1rZXk="}`, nil) // "test-cert" / "test-key"
dynamicCert.SetCertKeyContent([]byte("test-cert"), []byte("test-key")).
Return(nil)
@ -740,7 +740,7 @@ func TestAgentController(t *testing.T) {
validClusterInfoConfigMap,
},
mocks: func(t *testing.T, executor *mocks.MockPodCommandExecutorMockRecorder, dynamicCert *mocks.MockDynamicCertPrivateMockRecorder, execCache *cache.Expiring) {
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "pinniped-concierge-kube-cert-agent", "print").
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "sleeper", "pinniped-concierge-kube-cert-agent", "print").
Return("", fmt.Errorf("some exec error")).
AnyTimes()
},
@ -769,7 +769,7 @@ func TestAgentController(t *testing.T) {
validClusterInfoConfigMap,
},
mocks: func(t *testing.T, executor *mocks.MockPodCommandExecutorMockRecorder, dynamicCert *mocks.MockDynamicCertPrivateMockRecorder, execCache *cache.Expiring) {
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "pinniped-concierge-kube-cert-agent", "print").
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "sleeper", "pinniped-concierge-kube-cert-agent", "print").
Return("bogus-data", nil).
AnyTimes()
},
@ -798,7 +798,7 @@ func TestAgentController(t *testing.T) {
validClusterInfoConfigMap,
},
mocks: func(t *testing.T, executor *mocks.MockPodCommandExecutorMockRecorder, dynamicCert *mocks.MockDynamicCertPrivateMockRecorder, execCache *cache.Expiring) {
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "pinniped-concierge-kube-cert-agent", "print").
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "sleeper", "pinniped-concierge-kube-cert-agent", "print").
Return(`{"tls.crt": "invalid"}`, nil).
AnyTimes()
},
@ -827,7 +827,7 @@ func TestAgentController(t *testing.T) {
validClusterInfoConfigMap,
},
mocks: func(t *testing.T, executor *mocks.MockPodCommandExecutorMockRecorder, dynamicCert *mocks.MockDynamicCertPrivateMockRecorder, execCache *cache.Expiring) {
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "pinniped-concierge-kube-cert-agent", "print").
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "sleeper", "pinniped-concierge-kube-cert-agent", "print").
Return(`{"tls.crt": "dGVzdAo=", "tls.key": "invalid"}`, nil).
AnyTimes()
},
@ -856,7 +856,7 @@ func TestAgentController(t *testing.T) {
validClusterInfoConfigMap,
},
mocks: func(t *testing.T, executor *mocks.MockPodCommandExecutorMockRecorder, dynamicCert *mocks.MockDynamicCertPrivateMockRecorder, execCache *cache.Expiring) {
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "pinniped-concierge-kube-cert-agent", "print").
executor.Exec(gomock.Any(), "concierge", "pinniped-concierge-kube-cert-agent-xyz-1234", "sleeper", "pinniped-concierge-kube-cert-agent", "print").
Return(`{"tls.crt": "dGVzdC1jZXJ0", "tls.key": "dGVzdC1rZXk="}`, nil). // "test-cert" / "test-key"
AnyTimes()
dynamicCert.SetCertKeyContent([]byte("test-cert"), []byte("test-key")).

10
internal/controller/kubecertagent/mocks/mockpodcommandexecutor.go
View File

@ -39,10 +39,10 @@ func (m *MockPodCommandExecutor) EXPECT() *MockPodCommandExecutorMockRecorder {
}
// Exec mocks base method.
func (m *MockPodCommandExecutor) Exec(arg0 context.Context, arg1, arg2 string, arg3 ...string) (string, error) {
func (m *MockPodCommandExecutor) Exec(arg0 context.Context, arg1, arg2, arg3 string, arg4 ...string) (string, error) {
m.ctrl.T.Helper()
varargs := []interface{}{arg0, arg1, arg2}
for _, a := range arg3 {
varargs := []interface{}{arg0, arg1, arg2, arg3}
for _, a := range arg4 {
varargs = append(varargs, a)
}
ret := m.ctrl.Call(m, "Exec", varargs...)
@ -52,8 +52,8 @@ func (m *MockPodCommandExecutor) Exec(arg0 context.Context, arg1, arg2 string, a
}
// Exec indicates an expected call of Exec.
func (mr *MockPodCommandExecutorMockRecorder) Exec(arg0, arg1, arg2 interface{}, arg3 ...interface{}) *gomock.Call {
func (mr *MockPodCommandExecutorMockRecorder) Exec(arg0, arg1, arg2, arg3 interface{}, arg4 ...interface{}) *gomock.Call {
mr.mock.ctrl.T.Helper()
varargs := append([]interface{}{arg0, arg1, arg2}, arg3...)
varargs := append([]interface{}{arg0, arg1, arg2, arg3}, arg4...)
return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Exec", reflect.TypeOf((*MockPodCommandExecutor)(nil).Exec), varargs...)
}

15
internal/controller/kubecertagent/pod_command_executor.go
View File

@ -16,7 +16,7 @@ import (
// PodCommandExecutor can exec a command in a pod located via namespace and name.
type PodCommandExecutor interface {
Exec(ctx context.Context, podNamespace string, podName string, commandAndArgs ...string) (stdoutResult string, err error)
Exec(ctx context.Context, podNamespace string, podName string, containerName string, commandAndArgs ...string) (stdoutResult string, err error)
}
type kubeClientPodCommandExecutor struct {
@ -32,7 +32,7 @@ func NewPodCommandExecutor(kubeConfig *restclient.Config, kubeClient kubernetes.
return &kubeClientPodCommandExecutor{kubeConfig: kubeConfig, kubeClient: kubeClient}
}
func (s *kubeClientPodCommandExecutor) Exec(ctx context.Context, podNamespace string, podName string, commandAndArgs ...string) (string, error) {
func (s *kubeClientPodCommandExecutor) Exec(ctx context.Context, podNamespace string, podName string, containerName string, commandAndArgs ...string) (string, error) {
request := s.kubeClient.
CoreV1().
RESTClient().
@ -42,11 +42,12 @@ func (s *kubeClientPodCommandExecutor) Exec(ctx context.Context, podNamespace st
Name(podName).
SubResource("exec").
VersionedParams(&v1.PodExecOptions{
Stdin: false,
Stdout: true,
Stderr: false,
TTY: false,
Command: commandAndArgs,
Stdin: false,
Stdout: true,
Stderr: false,
TTY: false,
Container: containerName,
Command: commandAndArgs,
}, scheme.ParameterCodec)
executor, err := remotecommand.NewSPDYExecutor(s.kubeConfig, "POST", request.URL())

2
internal/controller/kubecertagent/pod_command_executor_test.go
View File

@ -37,7 +37,7 @@ func TestSecureTLS(t *testing.T) {
// build this exactly like our production could does
podCommandExecutor := NewPodCommandExecutor(client.JSONConfig, client.Kubernetes)
got, err := podCommandExecutor.Exec(context.Background(), "podNamespace", "podName", "command", "arg1", "arg2")
got, err := podCommandExecutor.Exec(context.Background(), "podNamespace", "podName", "containerName", "command", "arg1", "arg2")
require.Equal(t, &errors.StatusError{}, err)
require.Empty(t, got)

5
internal/mocks/mockldapconn/mockldapconn.go
View File

@ -55,8 +55,9 @@ func (mr *MockConnMockRecorder) Bind(arg0, arg1 interface{}) *gomock.Call {
// Close mocks base method.
func (m *MockConn) Close() error {
m.ctrl.T.Helper()
m.ctrl.Call(m, "Close")
return nil
ret := m.ctrl.Call(m, "Close")
ret0, _ := ret[0].(error)
return ret0
}
// Close indicates an expected call of Close.