forked from kyverno/kyverno
/
mutation.go
183 lines (151 loc) · 5.37 KB
/
mutation.go
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package webhooks
import (
"reflect"
"sort"
"time"
kyverno "github.com/nirmata/kyverno/pkg/api/kyverno/v1"
v1 "github.com/nirmata/kyverno/pkg/api/kyverno/v1"
"github.com/nirmata/kyverno/pkg/engine"
"github.com/nirmata/kyverno/pkg/engine/context"
"github.com/nirmata/kyverno/pkg/engine/response"
engineutils "github.com/nirmata/kyverno/pkg/engine/utils"
"github.com/nirmata/kyverno/pkg/policyviolation"
v1beta1 "k8s.io/api/admission/v1beta1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)
// HandleMutation handles mutating webhook admission request
// return value: generated patches
func (ws *WebhookServer) HandleMutation(
request *v1beta1.AdmissionRequest,
resource unstructured.Unstructured,
policies []*kyverno.ClusterPolicy,
ctx *context.Context,
userRequestInfo kyverno.RequestInfo) []byte {
if len(policies) == 0 {
return nil
}
resourceName := request.Kind.Kind + "/" + request.Name
if request.Namespace != "" {
resourceName = request.Namespace + "/" + resourceName
}
logger := ws.log.WithValues("action", "mutate", "resource", resourceName, "operation", request.Operation)
var patches [][]byte
var engineResponses []response.EngineResponse
policyContext := engine.PolicyContext{
NewResource: resource,
AdmissionInfo: userRequestInfo,
Context: ctx,
ExcludeGroupRole: ws.configHandler.GetExcludeGroupRole(),
}
if request.Operation == v1beta1.Update {
// set OldResource to inform engine of operation type
policyContext.OldResource = resource
}
for _, policy := range policies {
logger.V(3).Info("evaluating policy", "policy", policy.Name)
policyContext.Policy = *policy
engineResponse := engine.Mutate(policyContext)
ws.statusListener.Send(mutateStats{resp: engineResponse, namespace: policy.Namespace})
if !engineResponse.IsSuccessful() {
logger.Info("failed to apply policy", "policy", policy.Name, "failed rules", engineResponse.GetFailedRules())
continue
}
err := ws.openAPIController.ValidateResource(*engineResponse.PatchedResource.DeepCopy(), engineResponse.PatchedResource.GetKind())
if err != nil {
logger.Error(err, "validation error", "policy", policy.Name)
continue
}
// gather patches
policyPatches := engineResponse.GetPatches()
if len(policyPatches) > 0 {
patches = append(patches, policyPatches...)
rules := engineResponse.GetSuccessRules()
logger.Info("mutation rules from policy applied successfully", "policy", policy.Name, "rules", rules)
}
policyContext.NewResource = engineResponse.PatchedResource
engineResponses = append(engineResponses, engineResponse)
}
// generate annotations
if annPatches := generateAnnotationPatches(engineResponses, logger); annPatches != nil {
patches = append(patches, annPatches)
}
// AUDIT
// generate violation when response fails
pvInfos := policyviolation.GeneratePVsFromEngineResponse(engineResponses, logger)
ws.pvGenerator.Add(pvInfos...)
// REPORTING EVENTS
// Scenario 1:
// some/all policies failed to apply on the resource. a policy violation is generated.
// create an event on the resource and the policy that failed
// Scenario 2:
// all policies were applied successfully.
// create an event on the resource
// ADD EVENTS
events := generateEvents(engineResponses, false, (request.Operation == v1beta1.Update), logger)
ws.eventGen.Add(events...)
// debug info
func() {
if len(patches) != 0 {
logger.V(4).Info("JSON patches generated")
}
// if any of the policies fails, print out the error
if !isResponseSuccesful(engineResponses) {
logger.Info("failed to apply mutation rules on the resource, reporting policy violation", "errors", getErrorMsg(engineResponses))
}
}()
// patches holds all the successful patches, if no patch is created, it returns nil
return engineutils.JoinPatches(patches)
}
type mutateStats struct {
resp response.EngineResponse
namespace string
}
func (ms mutateStats) PolicyName() string {
if ms.namespace == "" {
return ms.resp.PolicyResponse.Policy
}
return ms.namespace + "/" + ms.resp.PolicyResponse.Policy
}
func (ms mutateStats) UpdateStatus(status kyverno.PolicyStatus) kyverno.PolicyStatus {
if reflect.DeepEqual(response.EngineResponse{}, ms.resp) {
return status
}
var nameToRule = make(map[string]v1.RuleStats)
for _, rule := range status.Rules {
nameToRule[rule.Name] = rule
}
for _, rule := range ms.resp.PolicyResponse.Rules {
ruleStat := nameToRule[rule.Name]
ruleStat.Name = rule.Name
averageOver := int64(ruleStat.AppliedCount + ruleStat.FailedCount)
ruleStat.ExecutionTime = updateAverageTime(
rule.ProcessingTime,
ruleStat.ExecutionTime,
averageOver).String()
if rule.Success {
status.RulesAppliedCount++
status.ResourcesMutatedCount++
ruleStat.AppliedCount++
ruleStat.ResourcesMutatedCount++
} else {
status.RulesFailedCount++
ruleStat.FailedCount++
}
nameToRule[rule.Name] = ruleStat
}
var policyAverageExecutionTime time.Duration
var ruleStats = make([]v1.RuleStats, 0, len(nameToRule))
for _, ruleStat := range nameToRule {
executionTime, err := time.ParseDuration(ruleStat.ExecutionTime)
if err == nil {
policyAverageExecutionTime += executionTime
}
ruleStats = append(ruleStats, ruleStat)
}
sort.Slice(ruleStats, func(i, j int) bool {
return ruleStats[i].Name < ruleStats[j].Name
})
status.AvgExecutionTime = policyAverageExecutionTime.String()
status.Rules = ruleStats
return status
}