feat(operator): fetch cluster name from providers

Signed-off-by: Rishabh Soni <[email protected]> Add support for EKS Signed-off-by: Rishabh Soni <[email protected]> Remove AKS reference Signed-off-by: Rishabh Soni <[email protected]> Make provider hostname and endpoint configurable Signed-off-by: Rishabh Soni <[email protected]> Make provider hostname and endpoint configurable Signed-off-by: Rishabh Soni <[email protected]>
kubearmor · Dec 24, 2024 · 80bfbae · 80bfbae
1 parent 3dee887
commit 80bfbae
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Showing 6 changed files with 176 additions and 4 deletions.
diff --git a/KubeArmor/core/kubeUpdate.go b/KubeArmor/core/kubeUpdate.go
@@ -2761,6 +2761,8 @@ func (dm *KubeArmorDaemon) WatchConfigMap() cache.InformerSynced {
 			if cm, ok := obj.(*corev1.ConfigMap); ok && cm.Namespace == cmNS {
 				cfg.GlobalCfg.HostVisibility = cm.Data[cfg.ConfigHostVisibility]
 				cfg.GlobalCfg.Visibility = cm.Data[cfg.ConfigVisibility]
+				cfg.GlobalCfg.Cluster = cm.Data[cfg.ConfigCluster]
+				dm.Node.ClusterName = cm.Data[cfg.ConfigCluster]
 				if _, ok := cm.Data[cfg.ConfigDefaultPostureLogs]; ok {
 					cfg.GlobalCfg.DefaultPostureLogs = (cm.Data[cfg.ConfigDefaultPostureLogs] == "true")
 				}
@@ -2806,6 +2808,8 @@ func (dm *KubeArmorDaemon) WatchConfigMap() cache.InformerSynced {
 			if cm, ok := new.(*corev1.ConfigMap); ok && cm.Namespace == cmNS {
 				cfg.GlobalCfg.HostVisibility = cm.Data[cfg.ConfigHostVisibility]
 				cfg.GlobalCfg.Visibility = cm.Data[cfg.ConfigVisibility]
+				cfg.GlobalCfg.Cluster = cm.Data[cfg.ConfigCluster]
+				dm.Node.ClusterName = cm.Data[cfg.ConfigCluster]
 				if _, ok := cm.Data[cfg.ConfigDefaultPostureLogs]; ok {
 					cfg.GlobalCfg.DefaultPostureLogs = (cm.Data[cfg.ConfigDefaultPostureLogs] == "true")
 				}

diff --git a/deployments/helm/KubeArmorOperator/templates/deployment.yaml b/deployments/helm/KubeArmorOperator/templates/deployment.yaml
@@ -31,7 +31,9 @@ spec:
         {{- if or (eq $tag "latest") (and (hasPrefix "v" $tag) (semverCompare "^1.4.0" $tag)) }}
         # initDeploy flag is only supported from v1.4.0
         args:
-          - --initDeploy={{.Values.kubearmorOperator.initDeploy }}
+        {{- if .Values.kubearmorOperator.args -}}
+        {{- toYaml .Values.kubearmorOperator.args | trim | nindent 8 }}
+        {{- end }}
         {{- end }}
 
       serviceAccountName: {{ .Values.kubearmorOperator.name }}

diff --git a/deployments/helm/KubeArmorOperator/values.yaml b/deployments/helm/KubeArmorOperator/values.yaml
@@ -36,7 +36,8 @@ kubearmorOperator:
     repository: kubearmor/kubearmor-operator
     tag: ""
   imagePullPolicy: IfNotPresent
-  initDeploy: true
+  args:
+    - "--initDeploy=true"
 
 kubearmorConfig:
   defaultCapabilitiesPosture: audit

diff --git a/pkg/KubeArmorOperator/cmd/operator/main.go b/pkg/KubeArmorOperator/cmd/operator/main.go
@@ -32,6 +32,7 @@ var Opv1Client *opv1client.Clientset
 var Secv1Client *secv1client.Clientset
 var InitDeploy bool
 var LogLevel string
+var ProviderHostname, ProviderEndpoint string
 
 // Cmd represents the base command when called without any subcommands
 var Cmd = &cobra.Command{
@@ -55,7 +56,7 @@ var Cmd = &cobra.Command{
 		return nil
 	},
 	Run: func(cmd *cobra.Command, args []string) {
-		nodeWatcher := controllers.NewClusterWatcher(K8sClient, Logger, ExtClient, Opv1Client, Secv1Client, PathPrefix, DeploymentName, InitDeploy)
+		nodeWatcher := controllers.NewClusterWatcher(K8sClient, Logger, ExtClient, Opv1Client, Secv1Client, PathPrefix, DeploymentName, ProviderHostname, ProviderEndpoint, InitDeploy)
 		go nodeWatcher.WatchConfigCrd()
 		nodeWatcher.WatchNodes()
 
@@ -81,6 +82,8 @@ func init() {
 	Cmd.PersistentFlags().StringVar(&LsmOrder, "lsm", "bpf,apparmor,selinux", "lsm preference order to use")
 	Cmd.PersistentFlags().StringVar(&PathPrefix, "pathprefix", "/rootfs/", "path prefix for runtime search")
 	Cmd.PersistentFlags().StringVar(&DeploymentName, "deploymentName", "kubearmor-operator", "operator deployment name")
+	Cmd.PersistentFlags().StringVar(&ProviderHostname, "providerHostname", "", "IMDS URL hostname for retrieving cluster name")
+	Cmd.PersistentFlags().StringVar(&ProviderEndpoint, "providerEndpoint", "", "IMDS URL endpoint for retrieving cluster name")
 	// TODO:- set initDeploy to false by default once this change is added to stable
 	Cmd.PersistentFlags().BoolVar(&InitDeploy, "initDeploy", true, "Init container deployment")
 	Cmd.PersistentFlags().StringVar(&LogLevel, "loglevel", "info", "log level, e.g., debug, info, warn, error")

diff --git a/pkg/KubeArmorOperator/internal/controller/cluster.go b/pkg/KubeArmorOperator/internal/controller/cluster.go
@@ -45,6 +45,7 @@ var deployment_uuid types.UID
 var deployment_name string = "kubearmor-operator"
 var PathPrefix string
 var initDeploy bool
+var ProviderHostname, ProviderEndpoint string
 
 type ClusterWatcher struct {
 	Nodes          []Node
@@ -68,7 +69,7 @@ type Node struct {
 	Seccomp       string
 }
 
-func NewClusterWatcher(client *kubernetes.Clientset, log *zap.SugaredLogger, extClient *apiextensionsclientset.Clientset, opv1Client *opv1client.Clientset, secv1Client *secv1client.Clientset, pathPrefix, deploy_name string, initdeploy bool) *ClusterWatcher {
+func NewClusterWatcher(client *kubernetes.Clientset, log *zap.SugaredLogger, extClient *apiextensionsclientset.Clientset, opv1Client *opv1client.Clientset, secv1Client *secv1client.Clientset, pathPrefix, deploy_name, providerHostname, providerEndpoint string, initdeploy bool) *ClusterWatcher {
 	if informer == nil {
 		informer = informers.NewSharedInformerFactory(client, 0)
 	}
@@ -85,6 +86,9 @@ func NewClusterWatcher(client *kubernetes.Clientset, log *zap.SugaredLogger, ext
 	PathPrefix = pathPrefix
 	deployment_name = deploy_name
 	initDeploy = initdeploy
+	ProviderHostname = providerHostname
+	ProviderEndpoint = providerEndpoint
+
 	return &ClusterWatcher{
 		Nodes:          []Node{},
 		Daemonsets:     make(map[string]int),

diff --git a/pkg/KubeArmorOperator/internal/controller/resources.go b/pkg/KubeArmorOperator/internal/controller/resources.go
@@ -7,6 +7,9 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"io"
+	"net/http"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -470,6 +473,160 @@ func (clusterWatcher *ClusterWatcher) deployControllerDeployment(deployment *app
 	return nil
 }
 
+func (clusterWatcher *ClusterWatcher) getProvider(providerHostname, providerEndpoint string) (string, string, string) {
+	nodes, err := clusterWatcher.Client.CoreV1().Nodes().List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		clusterWatcher.Log.Warnf("Error listing nodes: %s\n", err.Error())
+	}
+
+	for _, node := range nodes.Items {
+		for key, label := range node.Labels {
+			if strings.Contains(key, "gke") || strings.Contains(label, "gke") {
+				if providerHostname != "" && providerEndpoint == "" {
+					providerEndpoint = "/computeMetadata/v1/instance/attributes/cluster-name"
+				} else if providerHostname == "" && providerEndpoint != "" {
+					providerHostname = "http://metadata.google.internal"
+				} else if providerHostname == "" && providerEndpoint == "" {
+					providerHostname = "http://metadata.google.internal"
+					providerEndpoint = "/computeMetadata/v1/instance/attributes/cluster-name"
+				}
+				return "gke", providerHostname, providerEndpoint
+			} else if strings.Contains(key, "eks") || strings.Contains(label, "eks") {
+				if providerHostname != "" && providerEndpoint == "" {
+					providerEndpoint = "/latest/user-data"
+				} else if providerHostname == "" && providerEndpoint != "" {
+					providerHostname = "http://169.254.169.254"
+				} else if providerHostname == "" && providerEndpoint == "" {
+					providerHostname = "http://169.254.169.254"
+					providerEndpoint = "/latest/user-data"
+				}
+				return "eks", providerHostname, providerEndpoint
+			}
+		}
+	}
+	return "default", "", ""
+}
+
+func (clusterWatcher *ClusterWatcher) fetchClusterNameFromGKE(providerHostname, providerEndpoint string) (string, error) {
+	url := providerHostname + providerEndpoint
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		clusterWatcher.Log.Warnf("failed to create request: %w, check provider host name and endpoint", err)
+		return "", err
+	}
+
+	// Set the required header
+	req.Header.Set("Metadata-Flavor", "Google")
+
+	// Create an HTTP client and make the request
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		clusterWatcher.Log.Warnf("error making request: %w, check provider host name and endpoint", err)
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	// Check for a successful response
+	if resp.StatusCode != http.StatusOK {
+		clusterWatcher.Log.Warnf("failed to fetch from metadata, status code: %d", resp.StatusCode)
+		return "", err
+	}
+
+	// Read the response body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		clusterWatcher.Log.Warnf("error reading response body: %w", err)
+		return "", err
+	}
+
+	return string(body), nil
+}
+
+func (clusterWatcher *ClusterWatcher) fetchClusterNameFromAWS(providerHostname, providerEndpoint string) (string, error) {
+	var token []byte
+	client := &http.Client{Timeout: 2 * time.Second}
+	req, err := http.NewRequest("PUT", providerHostname+"/latest/api/token", nil)
+	if err != nil {
+		clusterWatcher.Log.Warnf("failed to create request for fetching token: %w, check provider host name", err)
+		return "", err
+	}
+	req.Header.Set("X-aws-ec2-metadata-token-ttl-seconds", "21600")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		clusterWatcher.Log.Warnf("error making request: %w", err)
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusOK {
+		token, err = io.ReadAll(resp.Body)
+		if err != nil {
+			clusterWatcher.Log.Warnf("failed to read token: %d", err)
+			return "", err
+		}
+	}
+
+	// Fetch the EKS cluster name from user data
+	url := providerHostname + providerEndpoint
+	req, err = http.NewRequest("GET", url, nil)
+	client = &http.Client{Timeout: 2 * time.Second}
+	if err != nil {
+		clusterWatcher.Log.Warnf("failed to create request for fetching metadata: %w, check provider host name and endpoint", err)
+		return "", err
+	}
+	req.Header.Set("X-aws-ec2-metadata-token", string(token))
+
+	resp, err = client.Do(req)
+	if err != nil {
+		clusterWatcher.Log.Warnf("error making request: %w", err)
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		clusterWatcher.Log.Warnf("failed to fetch from metadata, status code: %d", resp.StatusCode)
+		return "", err
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		clusterWatcher.Log.Warnf("failed to read metadata: %d", err)
+		return "", err
+	}
+
+	// Extract EKS cluster name
+	re := regexp.MustCompile(`/etc/eks/bootstrap\.sh (\S+)`)
+	match := re.FindStringSubmatch(string(body))
+	if len(match) > 0 {
+		return match[1], nil
+	}
+
+	return "", err
+}
+
+func (clusterWatcher *ClusterWatcher) GetClusterName(providerHostname, providerEndpoint string) string {
+	provider, pHostname, pEndpoint := clusterWatcher.getProvider(ProviderHostname, providerEndpoint)
+	if provider == "gke" {
+		clusterWatcher.Log.Infof("Provider is GKE")
+		if clusterName, err := clusterWatcher.fetchClusterNameFromGKE(pHostname, pEndpoint); err != nil {
+			clusterWatcher.Log.Warnf("Cannot fetch cluster name for GKE %s", err.Error())
+		} else {
+			return clusterName
+		}
+	} else if provider == "eks" {
+		clusterWatcher.Log.Infof("Provider is EKS")
+		if clusterName, err := clusterWatcher.fetchClusterNameFromAWS(pHostname, pEndpoint); err != nil {
+			clusterWatcher.Log.Warnf("Cannot fetch cluster name for EKS %s", err.Error())
+		} else {
+			return clusterName
+		}
+	}
+
+	return "default"
+}
+
 func (clusterWatcher *ClusterWatcher) WatchRequiredResources() {
 	var caCert, tlsCrt, tlsKey *bytes.Buffer
 	var kGenErr, err, installErr error
@@ -653,6 +810,7 @@ func (clusterWatcher *ClusterWatcher) WatchRequiredResources() {
 	// kubearmor configmap
 	configmap := addOwnership(deployments.GetKubearmorConfigMap(common.Namespace, deployments.KubeArmorConfigMapName)).(*corev1.ConfigMap)
 	configmap.Data = common.ConfigMapData
+	configmap.Data["cluster"] = clusterWatcher.GetClusterName(ProviderHostname, ProviderEndpoint)
 
 	for {
 		caCert, tlsCrt, tlsKey, kGenErr = common.GeneratePki(common.Namespace, deployments.KubeArmorControllerWebhookServiceName)