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Run kube-cert-agent pod as Concierge ServiceAccount.

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Since 0dfb3e95c5, we no longer directly create the kube-cert-agent Pod, so our "use"
permission on PodSecurityPolicies no longer has the intended effect. Since the deployments controller is now the
one creating pods for us, we need to get the permission on the PodSpec of the target pod instead, which we do somewhat
simply by using the same service account as the main Concierge pods.

We still set `automountServiceAccountToken: false`, so this should not actually give any useful permissions to the
agent pod when running.

Signed-off-by: Matt Moyer <moyerm@vmware.com>
This commit is contained in:
Matt Moyer 2021-05-03 16:20:13 -05:00
parent d6a172214d
commit b80cbb8cc5
No known key found for this signature in database
GPG Key ID: EAE88AD172C5AE2D
7 changed files with 26 additions and 1 deletions
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1
deploy/concierge/deployment.yaml
View File

@ -47,6 +47,7 @@ data:
impersonationTLSCertificateSecret: (@= defaultResourceNameWithSuffix("impersonation-proxy-tls-serving-certificate") @)
impersonationCACertificateSecret: (@= defaultResourceNameWithSuffix("impersonation-proxy-ca-certificate") @)
impersonationSignerSecret: (@= defaultResourceNameWithSuffix("impersonation-proxy-signer-ca-certificate") @)
serviceAccount: (@= defaultResourceName() @)
labels: (@= json.encode(labels()).rstrip() @)
kubeCertAgent:
namePrefix: (@= defaultResourceNameWithSuffix("kube-cert-agent-") @)

3
internal/config/concierge/config.go
View File

@ -122,6 +122,9 @@ func validateNames(names *NamesConfigSpec) error {
if names.ImpersonationSignerSecret == "" {
missingNames = append(missingNames, "impersonationSignerSecret")
}
if names.ServiceAccount == "" {
missingNames = append(missingNames, "serviceAccount")
}
if len(missingNames) > 0 {
return constable.Error("missing required names: " + strings.Join(missingNames, ", "))
}

15
internal/config/concierge/config_test.go
View File

@ -43,6 +43,7 @@ func TestFromPath(t *testing.T) {
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
labels:
myLabelKey1: myLabelValue1
myLabelKey2: myLabelValue2
@ -72,6 +73,7 @@ func TestFromPath(t *testing.T) {
ImpersonationTLSCertificateSecret: "impersonationTLSCertificateSecret-value",
ImpersonationCACertificateSecret: "impersonationCACertificateSecret-value",
ImpersonationSignerSecret: "impersonationSignerSecret-value",
ServiceAccount: "serviceAccount-value",
},
Labels: map[string]string{
"myLabelKey1": "myLabelValue1",
@ -98,6 +100,7 @@ func TestFromPath(t *testing.T) {
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantConfig: &Config{
DiscoveryInfo: DiscoveryInfoSpec{
@ -119,6 +122,7 @@ func TestFromPath(t *testing.T) {
ImpersonationTLSCertificateSecret: "impersonationTLSCertificateSecret-value",
ImpersonationCACertificateSecret: "impersonationCACertificateSecret-value",
ImpersonationSignerSecret: "impersonationSignerSecret-value",
ServiceAccount: "serviceAccount-value",
},
Labels: map[string]string{},
KubeCertAgentConfig: KubeCertAgentSpec{
@ -133,7 +137,7 @@ func TestFromPath(t *testing.T) {
wantError: "validate names: missing required names: servingCertificateSecret, credentialIssuer, " +
"apiService, impersonationConfigMap, impersonationLoadBalancerService, " +
"impersonationTLSCertificateSecret, impersonationCACertificateSecret, " +
"impersonationSignerSecret",
"impersonationSignerSecret, serviceAccount",
},
{
name: "Missing apiService name",
@ -147,6 +151,7 @@ func TestFromPath(t *testing.T) {
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: apiService",
},
@ -162,6 +167,7 @@ func TestFromPath(t *testing.T) {
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: credentialIssuer",
},
@ -177,6 +183,7 @@ func TestFromPath(t *testing.T) {
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: servingCertificateSecret",
},
@ -192,6 +199,7 @@ func TestFromPath(t *testing.T) {
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: impersonationConfigMap",
},
@ -207,6 +215,7 @@ func TestFromPath(t *testing.T) {
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: impersonationLoadBalancerService",
},
@ -222,6 +231,7 @@ func TestFromPath(t *testing.T) {
impersonationLoadBalancerService: impersonationLoadBalancerService-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: impersonationTLSCertificateSecret",
},
@ -237,6 +247,7 @@ func TestFromPath(t *testing.T) {
impersonationLoadBalancerService: impersonationLoadBalancerService-value
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: impersonationCACertificateSecret",
},
@ -252,6 +263,7 @@ func TestFromPath(t *testing.T) {
impersonationLoadBalancerService: impersonationLoadBalancerService-value
impersonationTLSCertificateSecret: impersonationTLSCertificateSecret-value
impersonationCACertificateSecret: impersonationCACertificateSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: impersonationSignerSecret",
},
@ -265,6 +277,7 @@ func TestFromPath(t *testing.T) {
apiService: pinniped-api
impersonationLoadBalancerService: impersonationLoadBalancerService-value
impersonationSignerSecret: impersonationSignerSecret-value
serviceAccount: serviceAccount-value
`),
wantError: "validate names: missing required names: impersonationConfigMap, " +
"impersonationTLSCertificateSecret, impersonationCACertificateSecret",

1
internal/config/concierge/types.go
View File

@ -41,6 +41,7 @@ type NamesConfigSpec struct {
ImpersonationTLSCertificateSecret string `json:"impersonationTLSCertificateSecret"`
ImpersonationCACertificateSecret string `json:"impersonationCACertificateSecret"`
ImpersonationSignerSecret string `json:"impersonationSignerSecret"`
ServiceAccount string `json:"serviceAccount"`
}
// ServingCertificateConfigSpec contains the configuration knobs for the API's

4
internal/controller/kubecertagent/kubecertagent.go
View File

@ -64,6 +64,9 @@ type AgentConfig struct {
// NamePrefix will be prefixed to all agent pod names.
NamePrefix string
// ServiceAccountName is the service account under which to run the agent pods.
ServiceAccountName string
// ContainerImagePullSecrets is a list of names of Kubernetes Secret objects that will be used as
// ImagePullSecrets on the kube-cert-agent pods.
ContainerImagePullSecrets []string
@ -472,6 +475,7 @@ func (c *agentController) newAgentDeployment(controllerManagerPod *corev1.Pod) *
RestartPolicy: corev1.RestartPolicyAlways,
NodeSelector: controllerManagerPod.Spec.NodeSelector,
AutomountServiceAccountToken: pointer.BoolPtr(false),
ServiceAccountName: c.cfg.ServiceAccountName,
NodeName: controllerManagerPod.Spec.NodeName,
Tolerations: controllerManagerPod.Spec.Tolerations,
// We need to run the agent pod as root since the file permissions

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

@ -123,6 +123,7 @@ func TestAgentController(t *testing.T) {
}},
RestartPolicy: corev1.RestartPolicyAlways,
TerminationGracePeriodSeconds: pointer.Int64Ptr(0),
ServiceAccountName: "test-service-account-name",
AutomountServiceAccountToken: pointer.BoolPtr(false),
SecurityContext: &corev1.PodSecurityContext{
RunAsUser: pointer.Int64Ptr(0),
@ -672,6 +673,7 @@ func TestAgentController(t *testing.T) {
AgentConfig{
Namespace: "concierge",
ContainerImage: "pinniped-server-image",
ServiceAccountName: "test-service-account-name",
NamePrefix: "pinniped-concierge-kube-cert-agent-",
ContainerImagePullSecrets: []string{"pinniped-image-pull-secret"},
CredentialIssuerName: "pinniped-concierge-config",

1
internal/controllermanager/prepare_controllers.go
View File

@ -121,6 +121,7 @@ func PrepareControllers(c *Config) (func(ctx context.Context), error) {
agentConfig := kubecertagent.AgentConfig{
Namespace: c.ServerInstallationInfo.Namespace,
ServiceAccountName: c.NamesConfig.ServiceAccount,
ContainerImage: *c.KubeCertAgentConfig.Image,
NamePrefix: *c.KubeCertAgentConfig.NamePrefix,
ContainerImagePullSecrets: c.KubeCertAgentConfig.ImagePullSecrets,