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prioritizationhandler.go
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/
prioritizationhandler.go
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package resourcesprioritization
import (
"context"
"encoding/json"
"fmt"
logger "github.com/kubescape/go-logger"
"github.com/kubescape/go-logger/helpers"
"github.com/kubescape/k8s-interface/workloadinterface"
"github.com/kubescape/kubescape/v2/core/cautils"
"github.com/kubescape/kubescape/v2/core/cautils/getter"
"github.com/kubescape/opa-utils/reporthandling/attacktrack/v1alpha1"
"github.com/kubescape/opa-utils/reporthandling/results/v1/prioritization"
)
type ResourcesPrioritizationHandler struct {
resourceToAttackTracks map[string]v1alpha1.IAttackTrack
attackTracks []v1alpha1.IAttackTrack
buildResourcesMap bool
}
func NewResourcesPrioritizationHandler(ctx context.Context, attackTracksGetter getter.IAttackTracksGetter, buildResourcesMap bool) (*ResourcesPrioritizationHandler, error) {
handler := &ResourcesPrioritizationHandler{
attackTracks: make([]v1alpha1.IAttackTrack, 0),
resourceToAttackTracks: make(map[string]v1alpha1.IAttackTrack),
buildResourcesMap: buildResourcesMap,
}
tracks, err := attackTracksGetter.GetAttackTracks()
if err != nil {
return nil, err
} else {
for _, attackTrack := range tracks {
if !attackTrack.IsValid() {
return nil, fmt.Errorf("invalid attack track: %s", attackTrack.GetName())
}
t := attackTrack
handler.attackTracks = append(handler.attackTracks, &t)
}
}
if len(handler.attackTracks) == 0 {
return nil, fmt.Errorf("expected to find at least one attack track")
}
// Store attack tracks in cache
cache := getter.GetDefaultPath(cautils.LocalAttackTracksFilename)
if err := getter.SaveInFile(tracks, cache); err != nil {
logger.L().Ctx(ctx).Warning("failed to cache file", helpers.String("file", cache), helpers.Error(err))
}
return handler, nil
}
func (handler *ResourcesPrioritizationHandler) PrioritizeResources(sessionObj *cautils.OPASessionObj) error {
if sessionObj.AllPolicies == nil {
return fmt.Errorf("expected to find policies map")
} else if len(sessionObj.AllPolicies.Controls) == 0 {
return fmt.Errorf("expected to find controls in policies map")
}
allControls := make(map[string]v1alpha1.IAttackTrackControl, len(sessionObj.AllPolicies.Controls))
for id := range sessionObj.AllPolicies.Controls {
ctrl := sessionObj.AllPolicies.Controls[id]
allControls[id] = &ctrl
}
for resourceId, result := range sessionObj.ResourcesResult {
resourcePriorityVector := []prioritization.ControlsVector{}
resource, exist := sessionObj.AllResources[resourceId]
if !exist {
continue
}
workload := workloadinterface.NewWorkloadObj(resource.GetObject())
if workload != nil && handler.isSupportedKind(workload) {
// build a map of attack track categories to a list of failed controls for the specific resource
failedControls := result.ListControlsIDs(nil).Failed()
if len(failedControls) > 0 {
controlsLookup := v1alpha1.NewAttackTrackControlsLookup(handler.attackTracks, failedControls, allControls)
replicaCount := workload.GetReplicas()
for _, attackTrack := range handler.attackTracks {
if !controlsLookup.HasAssociatedControls(attackTrack.GetName()) {
continue
}
// Load the failed controls into the attack track
allPathsHandler := v1alpha1.NewAttackTrackAllPathsHandler(attackTrack, &controlsLookup)
// only build the map if the user requested it
if handler.buildResourcesMap {
// Store the attack track for returning to the caller
handler.resourceToAttackTracks[resourceId] = handler.copyAttackTrack(attackTrack, &controlsLookup)
}
// Calculate all the paths for the attack track
allAttackPaths := allPathsHandler.CalculateAllPaths()
// Create priority vectors from every attack path
controlsVectors := prioritization.ControlsVectorFromAttackTrackPaths(attackTrack, allAttackPaths)
// Calculate the score and severity for every priority vector, and add it to the resource priority vector
for _, controlsVector := range controlsVectors {
if score, err := controlsVector.CalculateScore(allControls, replicaCount); err == nil {
controlsVector.SetScore(score)
} else {
return err
}
if severity, err := controlsVector.CalculateSeverity(allControls); err == nil {
controlsVector.SetSeverity(severity)
} else {
return err
}
resourcePriorityVector = append(resourcePriorityVector, controlsVector)
}
}
}
}
// Resource priority vector is ready, add it to the session object
prioritizedResource := prioritization.PrioritizedResource{
ResourceID: resourceId,
PriorityVector: resourcePriorityVector,
}
prioritizedResource.SetSeverity(prioritizedResource.CalculateSeverity())
prioritizedResource.SetScore(prioritizedResource.CalculateScore())
if prioritizedResource.GetScore() == 0 {
continue
}
sessionObj.ResourcesPrioritized[resourceId] = prioritizedResource
}
sessionObj.ResourceAttackTracks = handler.resourceToAttackTracks
return nil
}
func (handler *ResourcesPrioritizationHandler) isSupportedKind(obj workloadinterface.IMetadata) bool {
if obj != nil {
switch obj.GetKind() {
case "Deployment",
"Pod",
"ReplicaSet",
"Node",
"DaemonSet",
"StatefulSet",
"Job",
"CronJob":
return true
}
}
return false
}
func (handler *ResourcesPrioritizationHandler) copyAttackTrack(attackTrack v1alpha1.IAttackTrack, lookup v1alpha1.IAttackTrackControlsLookup) v1alpha1.IAttackTrack {
copyBytes, _ := json.Marshal(attackTrack)
var copyObj v1alpha1.AttackTrack
json.Unmarshal(copyBytes, ©Obj)
iter := copyObj.Iterator()
for iter.HasNext() {
step := iter.Next()
failedControls := lookup.GetAssociatedControls(copyObj.GetName(), step.GetName())
step.SetControls(failedControls)
}
return ©Obj
}