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kubeadm_config.go
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kubeadm_config.go
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/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package k8sapi
import (
"path/filepath"
"github.com/edgelesssys/constellation/v2/bootstrapper/internal/kubelet"
"github.com/edgelesssys/constellation/v2/internal/constants"
"github.com/edgelesssys/constellation/v2/internal/kubernetes"
"github.com/edgelesssys/constellation/v2/internal/versions"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubeletconf "k8s.io/kubelet/config/v1beta1"
kubeadm "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
kubeconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
)
// Uses types defined here: https://kubernetes.io/docs/reference/config-api/kubeadm-config.v1beta3/
// Slimmed down to the fields we require
const (
auditLogDir = "/var/log/kubernetes/audit/"
auditLogFile = "audit.log"
auditPolicyPath = "/etc/kubernetes/audit-policy.yaml"
)
type KubdeadmConfiguration struct{}
func (c *KubdeadmConfiguration) InitConfiguration(externalCloudProvider bool, k8sVersion versions.ValidK8sVersion) KubeadmInitYAML {
var cloudProvider string
if externalCloudProvider {
cloudProvider = "external"
}
return KubeadmInitYAML{
InitConfiguration: kubeadm.InitConfiguration{
TypeMeta: metav1.TypeMeta{
APIVersion: kubeadm.SchemeGroupVersion.String(),
Kind: "InitConfiguration",
},
NodeRegistration: kubeadm.NodeRegistrationOptions{
CRISocket: "unix:///run/containerd/containerd.sock",
KubeletExtraArgs: map[string]string{
"cloud-provider": cloudProvider,
},
},
// AdvertiseAddress will be overwritten later
LocalAPIEndpoint: kubeadm.APIEndpoint{
BindPort: constants.KubernetesPort,
},
},
// https://pkg.go.dev/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3#ClusterConfiguration
ClusterConfiguration: kubeadm.ClusterConfiguration{
TypeMeta: metav1.TypeMeta{
Kind: "ClusterConfiguration",
APIVersion: kubeadm.SchemeGroupVersion.String(),
},
// Target kubernetes version of the control plane.
KubernetesVersion: versions.VersionConfigs[k8sVersion].PatchVersion,
// necessary to be able to access the kubeapi server through localhost
APIServer: kubeadm.APIServer{
ControlPlaneComponent: kubeadm.ControlPlaneComponent{
ExtraArgs: map[string]string{
"audit-policy-file": auditPolicyPath,
"audit-log-path": filepath.Join(auditLogDir, auditLogFile), // CIS benchmark
"audit-log-maxage": "30", // CIS benchmark - Default value of Rancher
"audit-log-maxbackup": "10", // CIS benchmark - Default value of Rancher
"audit-log-maxsize": "100", // CIS benchmark - Default value of Rancher
"profiling": "false", // CIS benchmark
"egress-selector-config-file": "/etc/kubernetes/egress-selector-configuration.yaml",
"kubelet-certificate-authority": filepath.Join(
kubeconstants.KubernetesDir,
kubeconstants.DefaultCertificateDir,
kubeconstants.CACertName,
),
"tls-cipher-suites": "TLS_AES_128_GCM_SHA256,TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256," +
"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256," +
"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384," +
"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256," +
"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256," +
"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305," +
"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_RSA_WITH_3DES_EDE_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA," +
"TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_256_GCM_SHA384", // CIS benchmark
},
ExtraVolumes: []kubeadm.HostPathMount{
{
Name: "audit-log",
HostPath: auditLogDir,
MountPath: auditLogDir,
ReadOnly: false,
PathType: corev1.HostPathDirectoryOrCreate,
},
{
Name: "audit",
HostPath: auditPolicyPath,
MountPath: auditPolicyPath,
ReadOnly: true,
PathType: corev1.HostPathFile,
},
{
Name: "egress-config",
HostPath: "/etc/kubernetes/egress-selector-configuration.yaml",
MountPath: "/etc/kubernetes/egress-selector-configuration.yaml",
ReadOnly: true,
PathType: corev1.HostPathFile,
},
{
Name: "konnectivity-uds",
HostPath: "/etc/kubernetes/konnectivity-server",
MountPath: "/etc/kubernetes/konnectivity-server",
ReadOnly: false,
PathType: corev1.HostPathDirectoryOrCreate,
},
},
},
CertSANs: []string{"127.0.0.1"},
},
ControllerManager: kubeadm.ControlPlaneComponent{
ExtraArgs: map[string]string{
"flex-volume-plugin-dir": "/opt/libexec/kubernetes/kubelet-plugins/volume/exec/",
"cloud-provider": cloudProvider,
"configure-cloud-routes": "false",
"profiling": "false", // CIS benchmark
"terminated-pod-gc-threshold": "1000", // CIS benchmark - Default value of Rancher
},
},
Scheduler: kubeadm.ControlPlaneComponent{
ExtraArgs: map[string]string{
"profiling": "false",
},
},
},
// warning: this config is applied to every node in the cluster!
KubeletConfiguration: kubeletconf.KubeletConfiguration{
ProtectKernelDefaults: true, // CIS benchmark
TLSCipherSuites: []string{
"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305",
"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
"TLS_RSA_WITH_AES_256_GCM_SHA384",
"TLS_RSA_WITH_AES_128_GCM_SHA256",
}, // CIS benchmark
StaticPodPath: "/etc/kubernetes/manifests",
TypeMeta: metav1.TypeMeta{
APIVersion: kubeletconf.SchemeGroupVersion.String(),
Kind: "KubeletConfiguration",
},
RegisterWithTaints: []corev1.Taint{
{
Key: "node.cloudprovider.kubernetes.io/uninitialized",
Value: "true",
Effect: corev1.TaintEffectPreferNoSchedule,
},
{
Key: "node.cilium.io/agent-not-ready",
Value: "true",
Effect: corev1.TaintEffectPreferNoSchedule,
},
},
TLSCertFile: kubelet.CertificateFilename,
TLSPrivateKeyFile: kubelet.KeyFilename,
},
}
}
func (c *KubdeadmConfiguration) JoinConfiguration(externalCloudProvider bool) KubeadmJoinYAML {
var cloudProvider string
if externalCloudProvider {
cloudProvider = "external"
}
return KubeadmJoinYAML{
JoinConfiguration: kubeadm.JoinConfiguration{
TypeMeta: metav1.TypeMeta{
APIVersion: kubeadm.SchemeGroupVersion.String(),
Kind: "JoinConfiguration",
},
NodeRegistration: kubeadm.NodeRegistrationOptions{
CRISocket: "unix:///run/containerd/containerd.sock",
KubeletExtraArgs: map[string]string{
"cloud-provider": cloudProvider,
},
},
Discovery: kubeadm.Discovery{
BootstrapToken: &kubeadm.BootstrapTokenDiscovery{},
},
},
KubeletConfiguration: kubeletconf.KubeletConfiguration{
TypeMeta: metav1.TypeMeta{
APIVersion: kubeletconf.SchemeGroupVersion.String(),
Kind: "KubeletConfiguration",
},
},
}
}
type KubeadmJoinYAML struct {
JoinConfiguration kubeadm.JoinConfiguration
KubeletConfiguration kubeletconf.KubeletConfiguration
}
func (k *KubeadmJoinYAML) SetNodeName(nodeName string) {
k.JoinConfiguration.NodeRegistration.Name = nodeName
}
func (k *KubeadmJoinYAML) SetAPIServerEndpoint(apiServerEndpoint string) {
k.JoinConfiguration.Discovery.BootstrapToken.APIServerEndpoint = apiServerEndpoint
}
func (k *KubeadmJoinYAML) SetToken(token string) {
k.JoinConfiguration.Discovery.BootstrapToken.Token = token
}
func (k *KubeadmJoinYAML) AppendDiscoveryTokenCaCertHash(discoveryTokenCaCertHash string) {
k.JoinConfiguration.Discovery.BootstrapToken.CACertHashes = append(k.JoinConfiguration.Discovery.BootstrapToken.CACertHashes, discoveryTokenCaCertHash)
}
func (k *KubeadmJoinYAML) SetNodeIP(nodeIP string) {
if k.JoinConfiguration.NodeRegistration.KubeletExtraArgs == nil {
k.JoinConfiguration.NodeRegistration.KubeletExtraArgs = map[string]string{"node-ip": nodeIP}
} else {
k.JoinConfiguration.NodeRegistration.KubeletExtraArgs["node-ip"] = nodeIP
}
}
func (k *KubeadmJoinYAML) SetProviderID(providerID string) {
k.KubeletConfiguration.ProviderID = providerID
}
func (k *KubeadmJoinYAML) SetControlPlane(advertiseAddress string) {
k.JoinConfiguration.ControlPlane = &kubeadm.JoinControlPlane{
LocalAPIEndpoint: kubeadm.APIEndpoint{
AdvertiseAddress: advertiseAddress,
BindPort: constants.KubernetesPort,
},
}
k.JoinConfiguration.SkipPhases = []string{"control-plane-prepare/download-certs"}
}
func (k *KubeadmJoinYAML) Marshal() ([]byte, error) {
return kubernetes.MarshalK8SResources(k)
}
func (k *KubeadmJoinYAML) Unmarshal(yamlData []byte) (KubeadmJoinYAML, error) {
var tmp KubeadmJoinYAML
return tmp, kubernetes.UnmarshalK8SResources(yamlData, &tmp)
}
type KubeadmInitYAML struct {
InitConfiguration kubeadm.InitConfiguration
ClusterConfiguration kubeadm.ClusterConfiguration
KubeletConfiguration kubeletconf.KubeletConfiguration
}
func (k *KubeadmInitYAML) SetNodeName(nodeName string) {
k.InitConfiguration.NodeRegistration.Name = nodeName
}
// SetCertSANs sets the SANs for the certificate.
func (k *KubeadmInitYAML) SetCertSANs(certSANs []string) {
for _, certSAN := range certSANs {
if certSAN == "" {
continue
}
k.ClusterConfiguration.APIServer.CertSANs = append(k.ClusterConfiguration.APIServer.CertSANs, certSAN)
}
}
func (k *KubeadmInitYAML) SetAPIServerAdvertiseAddress(apiServerAdvertiseAddress string) {
k.InitConfiguration.LocalAPIEndpoint.AdvertiseAddress = apiServerAdvertiseAddress
}
// SetControlPlaneEndpoint sets the control plane endpoint if controlPlaneEndpoint is not empty.
func (k *KubeadmInitYAML) SetControlPlaneEndpoint(controlPlaneEndpoint string) {
if controlPlaneEndpoint != "" {
k.ClusterConfiguration.ControlPlaneEndpoint = controlPlaneEndpoint
}
}
func (k *KubeadmInitYAML) SetServiceCIDR(serviceCIDR string) {
k.ClusterConfiguration.Networking.ServiceSubnet = serviceCIDR
}
func (k *KubeadmInitYAML) SetPodNetworkCIDR(podNetworkCIDR string) {
k.ClusterConfiguration.Networking.PodSubnet = podNetworkCIDR
}
func (k *KubeadmInitYAML) SetServiceDNSDomain(serviceDNSDomain string) {
k.ClusterConfiguration.Networking.DNSDomain = serviceDNSDomain
}
func (k *KubeadmInitYAML) SetNodeIP(nodeIP string) {
if k.InitConfiguration.NodeRegistration.KubeletExtraArgs == nil {
k.InitConfiguration.NodeRegistration.KubeletExtraArgs = map[string]string{"node-ip": nodeIP}
} else {
k.InitConfiguration.NodeRegistration.KubeletExtraArgs["node-ip"] = nodeIP
}
}
func (k *KubeadmInitYAML) SetProviderID(providerID string) {
if k.InitConfiguration.NodeRegistration.KubeletExtraArgs == nil {
k.InitConfiguration.NodeRegistration.KubeletExtraArgs = map[string]string{"provider-id": providerID}
} else {
k.InitConfiguration.NodeRegistration.KubeletExtraArgs["provider-id"] = providerID
}
}
func (k *KubeadmInitYAML) Marshal() ([]byte, error) {
return kubernetes.MarshalK8SResources(k)
}
func (k *KubeadmInitYAML) Unmarshal(yamlData []byte) (KubeadmInitYAML, error) {
var tmp KubeadmInitYAML
return tmp, kubernetes.UnmarshalK8SResources(yamlData, &tmp)
}