feat(config): reload global config when config file is updated

KubeArmor/config/config.go

@@ -238,6 +238,7 @@ func LoadConfig() error {
 	if cfgfile == "" {
 		cfgfile = "kubearmor.yaml"
 	}
+
 	if _, err := os.Stat(cfgfile); err == nil {
 		kg.Printf("setting config from file [%s]", cfgfile)
 		viper.SetConfigFile(cfgfile)
@@ -247,6 +248,8 @@ func LoadConfig() error {
 		}
 	}
 
+	kg.Printf("Configuration [%+v]", GlobalCfg)
+
 	GlobalCfg.Cluster = viper.GetString(ConfigCluster)
 	GlobalCfg.Host = viper.GetString(ConfigHost)
 	if hostname, err := os.Hostname(); GlobalCfg.Host == "" && err == nil {
@@ -268,16 +271,41 @@ func LoadConfig() error {
 		return fmt.Errorf("CRI socket must start with 'unix://' (%s is invalid)", GlobalCfg.CRISocket)
 	}
 
-	GlobalCfg.Visibility = viper.GetString(ConfigVisibility)
-	GlobalCfg.HostVisibility = viper.GetString(ConfigHostVisibility)
-
 	GlobalCfg.Policy = viper.GetBool(ConfigKubearmorPolicy)
 	GlobalCfg.HostPolicy = viper.GetBool(ConfigKubearmorHostPolicy)
 	GlobalCfg.KVMAgent = viper.GetBool(ConfigKubearmorVM)
 	GlobalCfg.K8sEnv = viper.GetBool(ConfigK8sEnv)
 
 	GlobalCfg.Debug = viper.GetBool(ConfigDebug)
 
+	if GlobalCfg.KVMAgent {
+		GlobalCfg.Policy = false
+		GlobalCfg.HostPolicy = true
+	}
+
+	GlobalCfg.CoverageTest = viper.GetBool(ConfigCoverageTest)
+
+	GlobalCfg.ConfigUntrackedNs = strings.Split(viper.GetString(ConfigUntrackedNs), ",")
+
+	GlobalCfg.LsmOrder = strings.Split(viper.GetString(LsmOrder), ",")
+
+	GlobalCfg.BPFFsPath = viper.GetString(BPFFsPath)
+
+	GlobalCfg.InitTimeout = viper.GetString(ConfigInitTimeout)
+
+	GlobalCfg.StateAgent = viper.GetBool(ConfigStateAgent)
+
+	GlobalCfg.AnnotateResources = viper.GetBool(ConfigAnnotateResources)
+
+	LoadDynamicConfig()
+
+	kg.Printf("Final Configuration [%+v]", GlobalCfg)
+
+	return nil
+}
+
+// LoadDynamicConfig set dynamic configuration which can be updated at runtime without restarting kubearmor
+func LoadDynamicConfig() {
 	GlobalCfg.DefaultFilePosture = viper.GetString(ConfigDefaultFilePosture)
 	GlobalCfg.DefaultNetworkPosture = viper.GetString(ConfigDefaultNetworkPosture)
 	GlobalCfg.DefaultCapabilitiesPosture = viper.GetString(ConfigDefaultCapabilitiesPosture)
@@ -286,12 +314,8 @@ func LoadConfig() error {
 	GlobalCfg.HostDefaultNetworkPosture = viper.GetString(ConfigHostDefaultNetworkPosture)
 	GlobalCfg.HostDefaultCapabilitiesPosture = viper.GetString(ConfigHostDefaultCapabilitiesPosture)
 
-	kg.Printf("Configuration [%+v]", GlobalCfg)
-
-	if GlobalCfg.KVMAgent {
-		GlobalCfg.Policy = false
-		GlobalCfg.HostPolicy = true
-	}
+	GlobalCfg.Visibility = viper.GetString(ConfigVisibility)
+	GlobalCfg.HostVisibility = viper.GetString(ConfigHostVisibility)
 
 	if GlobalCfg.HostVisibility == "default" {
 		if GlobalCfg.KVMAgent || (!GlobalCfg.K8sEnv && GlobalCfg.HostPolicy) {
@@ -301,28 +325,10 @@ func LoadConfig() error {
 		}
 	}
 
-	GlobalCfg.CoverageTest = viper.GetBool(ConfigCoverageTest)
-
-	GlobalCfg.ConfigUntrackedNs = strings.Split(viper.GetString(ConfigUntrackedNs), ",")
-
-	GlobalCfg.LsmOrder = strings.Split(viper.GetString(LsmOrder), ",")
-
-	GlobalCfg.BPFFsPath = viper.GetString(BPFFsPath)
-
 	GlobalCfg.EnforcerAlerts = viper.GetBool(EnforcerAlerts)
-
 	GlobalCfg.DefaultPostureLogs = viper.GetBool(ConfigDefaultPostureLogs)
 
-	GlobalCfg.InitTimeout = viper.GetString(ConfigInitTimeout)
-
-	GlobalCfg.StateAgent = viper.GetBool(ConfigStateAgent)
-
 	GlobalCfg.AlertThrottling = viper.GetBool(ConfigAlertThrottling)
 	GlobalCfg.MaxAlertPerSec = viper.GetInt(ConfigMaxAlertPerSec)
 	GlobalCfg.ThrottleSec = viper.GetInt(ConfigThrottleSec)
-	GlobalCfg.AnnotateResources = viper.GetBool(ConfigAnnotateResources)
-
-	kg.Printf("Final Configuration [%+v]", GlobalCfg)
-
-	return nil
 }

KubeArmor/core/kubeArmor.go

@@ -413,6 +413,8 @@ func KubeArmor() {
 		dm.Node.KernelVersion = kl.GetCommandOutputWithoutErr("uname", []string{"-r"})
 		dm.Node.KernelVersion = strings.TrimSuffix(dm.Node.KernelVersion, "\n")
 
+		dm.WatchConfigChanges()
+
 		dm.NodeLock.Unlock()
 
 	} else if cfg.GlobalCfg.K8sEnv {

KubeArmor/core/unorchestratedUpdates.go

@@ -5,6 +5,8 @@ package core
 
 import (
 	"encoding/json"
+	"github.com/fsnotify/fsnotify"
+	"github.com/spf13/viper"
 	"os"
 	"regexp"
 	"sort"
@@ -38,6 +40,50 @@ func (dm *KubeArmorDaemon) SetContainerNSVisibility() {
 	dm.UpdateVisibility("ADDED", "container_namespace", visibility)
 }
 
+// =================== //
+// == Config Update == //
+// =================== //
+
+// WatchConfigChanges watches for configuration changes and updates the default posture
+func (dm *KubeArmorDaemon) WatchConfigChanges() {
+	viper.OnConfigChange(func(e fsnotify.Event) {
+		dm.Logger.Printf("Config file changed: %s", e.Name)
+		cfg.LoadDynamicConfig()
+
+		// Update the default posture
+		globalPosture := tp.DefaultPosture{
+			FileAction:         validateGlobalDefaultPosture(cfg.GlobalCfg.DefaultFilePosture),
+			NetworkAction:      validateGlobalDefaultPosture(cfg.GlobalCfg.DefaultNetworkPosture),
+			CapabilitiesAction: validateGlobalDefaultPosture(cfg.GlobalCfg.DefaultCapabilitiesPosture),
+		}
+		// Update the visibility
+		visibility := tp.Visibility{
+			File:         dm.validateVisibility("file", cfg.GlobalCfg.Visibility),
+			Process:      dm.validateVisibility("process", cfg.GlobalCfg.Visibility),
+			Network:      dm.validateVisibility("network", cfg.GlobalCfg.Visibility),
+			Capabilities: dm.validateVisibility("capabilities", cfg.GlobalCfg.Visibility),
+		}
+
+		// Apply the changes to the daemon
+		dm.UpdateGlobalPosture(globalPosture)
+
+		// Update default posture for endpoints
+		for _, ep := range dm.EndPoints {
+			dm.Logger.Printf("Updating Default Posture for endpoint %s", ep.EndPointName)
+			dm.UpdateDefaultPosture("MODIFIED", ep.NamespaceName, globalPosture, false)
+			dm.UpdateVisibility("MODIFIED", ep.NamespaceName, visibility)
+		}
+
+		// Update throttling configs
+		dm.SystemMonitor.UpdateThrottlingConfig()
+
+		// Update the default posture and visibility for the unorchestrated containers
+		dm.SystemMonitor.UpdateVisibility()
+		dm.UpdateHostSecurityPolicies()
+	})
+	viper.WatchConfig()
+}
+
 // ====================================== //
 // == Container Security Policy Update == //
 // ====================================== //

KubeArmor/go.mod

@@ -30,6 +30,7 @@ require (
 	github.com/containerd/containerd v1.7.13
 	github.com/containerd/typeurl/v2 v2.1.1
 	github.com/docker/docker v25.0.5+incompatible
+	github.com/fsnotify/fsnotify v1.7.0
 	github.com/golang/protobuf v1.5.4
 	github.com/google/uuid v1.6.0
 	github.com/kubearmor/KubeArmor/pkg/KubeArmorController v0.0.0-20240110164432-c2c1b121cd94
@@ -64,7 +65,6 @@ require (
 	github.com/emicklei/go-restful/v3 v3.11.2 // indirect
 	github.com/evanphx/json-patch/v5 v5.7.0 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
-	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-openapi/jsonpointer v0.20.2 // indirect