mirror of
https://github.com/kyverno/kyverno.git
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109 lines
3.4 KiB
Go
109 lines
3.4 KiB
Go
package engine
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import (
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kyverno "github.com/kyverno/kyverno/pkg/api/kyverno/v1"
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"github.com/kyverno/kyverno/pkg/engine/response"
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"github.com/kyverno/kyverno/pkg/engine/variables"
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"sigs.k8s.io/controller-runtime/pkg/log"
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"time"
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)
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// Generate checks for validity of generate rule on the resource
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// 1. validate variables to be substitute in the general ruleInfo (match,exclude,condition)
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// - the caller has to check the ruleResponse to determine whether the path exist
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// 2. returns the list of rules that are applicable on this policy and resource, if 1 succeed
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func Generate(policyContext PolicyContext) (resp response.EngineResponse) {
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return filterRules(policyContext)
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}
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func filterRules(policyContext PolicyContext) response.EngineResponse {
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kind := policyContext.NewResource.GetKind()
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name := policyContext.NewResource.GetName()
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namespace := policyContext.NewResource.GetNamespace()
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resp := response.EngineResponse{
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PolicyResponse: response.PolicyResponse{
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Policy: policyContext.Policy.Name,
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Resource: response.ResourceSpec{
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Kind: kind,
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Name: name,
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Namespace: namespace,
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},
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},
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}
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if policyContext.ExcludeResourceFunc(kind, namespace, name) {
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log.Log.WithName("Generate").Info("resource excluded", "kind", kind, "namespace", namespace, "name", name)
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return resp
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}
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for _, rule := range policyContext.Policy.Spec.Rules {
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if ruleResp := filterRule(rule, policyContext); ruleResp != nil {
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resp.PolicyResponse.Rules = append(resp.PolicyResponse.Rules, *ruleResp)
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}
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}
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return resp
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}
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func filterRule(rule kyverno.Rule, policyContext PolicyContext) *response.RuleResponse {
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if !rule.HasGenerate() {
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return nil
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}
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startTime := time.Now()
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policy := policyContext.Policy
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newResource := policyContext.NewResource
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oldResource := policyContext.OldResource
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admissionInfo := policyContext.AdmissionInfo
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ctx := policyContext.Context
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resCache := policyContext.ResourceCache
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jsonContext := policyContext.JSONContext
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excludeGroupRole := policyContext.ExcludeGroupRole
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logger := log.Log.WithName("Generate").WithValues("policy", policy.Name,
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"kind", newResource.GetKind(), "namespace", newResource.GetNamespace(), "name", newResource.GetName())
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if err := MatchesResourceDescription(newResource, rule, admissionInfo, excludeGroupRole); err != nil {
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// if the oldResource matched, return "false" to delete GR for it
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if err := MatchesResourceDescription(oldResource, rule, admissionInfo, excludeGroupRole); err == nil {
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return &response.RuleResponse{
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Name: rule.Name,
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Type: "Generation",
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Success: false,
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RuleStats: response.RuleStats{
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ProcessingTime: time.Since(startTime),
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},
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}
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}
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return nil
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}
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// add configmap json data to context
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if err := AddResourceToContext(logger, rule.Context, resCache, jsonContext); err != nil {
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logger.V(4).Info("cannot add configmaps to context", "reason", err.Error())
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return nil
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}
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// operate on the copy of the conditions, as we perform variable substitution
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copyConditions := copyConditions(rule.Conditions)
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// evaluate pre-conditions
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if !variables.EvaluateConditions(logger, ctx, copyConditions) {
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logger.V(4).Info("preconditions not satisfied, skipping rule", "rule", rule.Name)
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return nil
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}
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// build rule Response
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return &response.RuleResponse{
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Name: rule.Name,
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Type: "Generation",
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Success: true,
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RuleStats: response.RuleStats{
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ProcessingTime: time.Since(startTime),
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},
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}
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}
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