forked from kyverno/kyverno
/
validation.go
195 lines (166 loc) · 5.87 KB
/
validation.go
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package webhooks
import (
"github.com/nirmata/kyverno/pkg/config"
"reflect"
"sort"
"time"
"github.com/go-logr/logr"
"github.com/nirmata/kyverno/pkg/event"
"github.com/nirmata/kyverno/pkg/policystatus"
"github.com/nirmata/kyverno/pkg/utils"
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"
"github.com/nirmata/kyverno/pkg/policyviolation"
v1beta1 "k8s.io/api/admission/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)
// HandleValidation handles validating webhook admission request
// If there are no errors in validating rule we apply generation rules
// patchedResource is the (resource + patches) after applying mutation rules
func HandleValidation(
request *v1beta1.AdmissionRequest,
policies []*kyverno.ClusterPolicy,
patchedResource []byte,
ctx *context.Context,
userRequestInfo kyverno.RequestInfo,
statusListener policystatus.Listener,
eventGen event.Interface,
pvGenerator policyviolation.GeneratorInterface,
log logr.Logger,
dynamicConfig config.Interface) (bool, string) {
if len(policies) == 0 {
return true, ""
}
resourceName := request.Kind.Kind + "/" + request.Name
if request.Namespace != "" {
resourceName = request.Namespace + "/" + resourceName
}
logger := log.WithValues("action", "validate", "resource", resourceName, "operation", request.Operation)
// Get new and old resource
newR, oldR, err := utils.ExtractResources(patchedResource, request)
if err != nil {
// as resource cannot be parsed, we skip processing
logger.Error(err, "failed to extract resource")
return true, ""
}
var deletionTimeStamp *metav1.Time
if reflect.DeepEqual(newR, unstructured.Unstructured{}) {
deletionTimeStamp = newR.GetDeletionTimestamp()
} else {
deletionTimeStamp = oldR.GetDeletionTimestamp()
}
if deletionTimeStamp != nil && request.Operation == v1beta1.Update {
return true, ""
}
policyContext := engine.PolicyContext{
NewResource: newR,
OldResource: oldR,
Context: ctx,
AdmissionInfo: userRequestInfo,
ExcludeGroupRole: dynamicConfig.GetExcludeGroupRole(),
}
var engineResponses []response.EngineResponse
for _, policy := range policies {
logger.V(3).Info("evaluating policy", "policy", policy.Name)
policyContext.Policy = *policy
engineResponse := engine.Validate(policyContext)
if reflect.DeepEqual(engineResponse, response.EngineResponse{}) {
// we get an empty response if old and new resources created the same response
// allow updates if resource update doesnt change the policy evaluation
continue
}
engineResponses = append(engineResponses, engineResponse)
statusListener.Send(validateStats{
resp: engineResponse,
namespace: policy.Namespace,
})
if !engineResponse.IsSuccessful() {
logger.V(4).Info("failed to apply policy", "policy", policy.Name, "failed rules", engineResponse.GetFailedRules())
continue
}
logger.Info("validation rules from policy applied succesfully", "policy", policy.Name)
}
// If Validation fails then reject the request
// no violations will be created on "enforce"
blocked := toBlockResource(engineResponses, logger)
// REPORTING EVENTS
// Scenario 1:
// resource is blocked, as there is a policy in "enforce" mode that failed.
// create an event on the policy to inform the resource request was blocked
// Scenario 2:
// some/all policies failed to apply on the resource. a policy volation is generated.
// create an event on the resource and the policy that failed
// Scenario 3:
// all policies were applied succesfully.
// create an event on the resource
events := generateEvents(engineResponses, blocked, (request.Operation == v1beta1.Update), logger)
eventGen.Add(events...)
if blocked {
logger.V(4).Info("resource blocked")
return false, getEnforceFailureErrorMsg(engineResponses)
}
// ADD POLICY VIOLATIONS
// violations are created with resource on "audit"
pvInfos := policyviolation.GeneratePVsFromEngineResponse(engineResponses, logger)
pvGenerator.Add(pvInfos...)
return true, ""
}
type validateStats struct {
resp response.EngineResponse
namespace string
}
func (vs validateStats) PolicyName() string {
if vs.namespace == "" {
return vs.resp.PolicyResponse.Policy
}
return vs.namespace + "/" + vs.resp.PolicyResponse.Policy
}
func (vs validateStats) UpdateStatus(status kyverno.PolicyStatus) kyverno.PolicyStatus {
if reflect.DeepEqual(response.EngineResponse{}, vs.resp) {
return status
}
var nameToRule = make(map[string]v1.RuleStats)
for _, rule := range status.Rules {
nameToRule[rule.Name] = rule
}
for _, rule := range vs.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++
ruleStat.AppliedCount++
} else {
status.RulesFailedCount++
ruleStat.FailedCount++
if vs.resp.PolicyResponse.ValidationFailureAction == "enforce" {
status.ResourcesBlockedCount++
ruleStat.ResourcesBlockedCount++
}
}
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
}