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Merge pull request #18 from avast/avast/feature/on-demand-cluster-scan
Introduce subcommands for main binary, add scanner functionality
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,181 +1,31 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "os" | ||
|
|
||
| log "github.com/sirupsen/logrus" | ||
| "k8s.io/api/admission/v1beta1" | ||
| appsv1 "k8s.io/api/apps/v1" | ||
| batchv1 "k8s.io/api/batch/v1" | ||
| batchv1beta1 "k8s.io/api/batch/v1beta1" | ||
| corev1 "k8s.io/api/core/v1" | ||
| extv1beta1 "k8s.io/api/extensions/v1beta1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
|
||
| func validate(ar v1beta1.AdmissionReview, config *config, clientSet *kubernetes.Clientset) *v1beta1.AdmissionResponse { | ||
| validation := &objectValidation{ar.Request.Kind.Kind, nil, &validationViolationSet{}} | ||
| deserializer := codecs.UniversalDeserializer() | ||
|
|
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| raw := ar.Request.Object.Raw | ||
| var configMessage string | ||
| switch ar.Request.Kind.Kind { | ||
| case "Pod": | ||
| configMessage = config.RuleResourceViolationMessage | ||
| pod := corev1.Pod{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &pod); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting Pod: %+v", pod) | ||
| validation.ObjMeta = &pod.ObjectMeta | ||
| validatePodSpec(validation, &pod.ObjectMeta, &pod.Spec, config) | ||
|
|
||
| case "ReplicaSet": | ||
| configMessage = config.RuleResourceViolationMessage | ||
| replicaSet := appsv1.ReplicaSet{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &replicaSet); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting ReplicaSet: %+v", replicaSet) | ||
| validation.ObjMeta = &replicaSet.ObjectMeta | ||
| validatePodSpec(validation, &replicaSet.Spec.Template.ObjectMeta, &replicaSet.Spec.Template.Spec, config) | ||
|
|
||
| case "Deployment": | ||
| configMessage = config.RuleResourceViolationMessage | ||
| deployment := appsv1.Deployment{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &deployment); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting deployment: %+v", deployment) | ||
| validation.ObjMeta = &deployment.ObjectMeta | ||
| validatePodSpec(validation, &deployment.Spec.Template.ObjectMeta, &deployment.Spec.Template.Spec, config) | ||
|
|
||
| case "DaemonSet": | ||
| configMessage = config.RuleResourceViolationMessage | ||
| daemonSet := appsv1.DaemonSet{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &daemonSet); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting DaemonSet: %+v", daemonSet) | ||
| validation.ObjMeta = &daemonSet.ObjectMeta | ||
| validatePodSpec(validation, &daemonSet.Spec.Template.ObjectMeta, &daemonSet.Spec.Template.Spec, config) | ||
|
|
||
| case "Job": | ||
| configMessage = config.RuleResourceViolationMessage | ||
| job := batchv1.Job{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &job); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting Job: %+v", job) | ||
| validation.ObjMeta = &job.ObjectMeta | ||
| validatePodSpec(validation, &job.Spec.Template.ObjectMeta, &job.Spec.Template.Spec, config) | ||
|
|
||
| case "CronJob": | ||
| configMessage = config.RuleResourceViolationMessage | ||
| cronJob := batchv1beta1.CronJob{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &cronJob); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting CronJob: %+v", cronJob) | ||
| validation.ObjMeta = &cronJob.ObjectMeta | ||
| validatePodSpec(validation, &cronJob.Spec.JobTemplate.Spec.Template.ObjectMeta, &cronJob.Spec.JobTemplate.Spec.Template.Spec, config) | ||
|
|
||
| case "Ingress": | ||
| configMessage = config.RuleIngressViolationMessage | ||
| ingress := extv1beta1.Ingress{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &ingress); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting Ingress: %+v", ingress) | ||
| validation.ObjMeta = &ingress.ObjectMeta | ||
| err := ValidateIngress(validation, &ingress, config, clientSet) | ||
| if err != nil { | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| case "StatefulSet": | ||
| configMessage = config.RuleResourceViolationMessage | ||
| statefulSet := appsv1.StatefulSet{} | ||
| if _, _, err := deserializer.Decode(raw, nil, &statefulSet); err != nil { | ||
| log.Error(err) | ||
| return toAdmissionResponse(err) | ||
| } | ||
|
|
||
| log.Debugf("Admitting stateful set: %+v", statefulSet) | ||
| validation.ObjMeta = &statefulSet.ObjectMeta | ||
| validatePodSpec(validation, &statefulSet.Spec.Template.ObjectMeta, &statefulSet.Spec.Template.Spec, config) | ||
|
|
||
| default: | ||
| log.Warnf("Admitted an unexpected resource: %v", ar.Request.Kind) | ||
| } | ||
|
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| reviewResponse := v1beta1.AdmissionResponse{} | ||
|
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| message := validation.message(configMessage) | ||
| if len(message) > 0 { | ||
| reviewResponse.Allowed = false | ||
| reviewResponse.Result = &metav1.Status{Message: message} | ||
| } else { | ||
| reviewResponse.Allowed = true | ||
| } | ||
|
|
||
| return &reviewResponse | ||
| var rootCmd = &cobra.Command { | ||
| Use: "k8s-admission-webhook", | ||
| Long: "Kubernetes Admission Webhook", | ||
| } | ||
|
|
||
| func main() { | ||
| initLogger() | ||
|
|
||
| //parse command line arguments | ||
| config, configErr := initialize() | ||
| if configErr != nil { | ||
| log.Fatal(configErr) | ||
| } | ||
| log.Debugf("Configuration is: %+v", config) | ||
|
|
||
| //initialize kube client | ||
| kubeClientSet, kubeClientSetErr := KubeClientSet(true) | ||
| if kubeClientSetErr != nil { | ||
| log.Fatal(kubeClientSetErr) | ||
| if err := rootCmd.Execute(); err != nil { | ||
| errorWithUsage(err) | ||
| } | ||
|
|
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| http.HandleFunc("/validate", admitFunc(validate).serve(config, kubeClientSet)) | ||
|
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||
| addr := fmt.Sprintf(":%v", config.ListenPort) | ||
| var httpErr error | ||
| if config.NoTLS { | ||
| log.Infof("Starting webserver at %v (no TLS)", addr) | ||
| httpErr = http.ListenAndServe(addr, nil) | ||
| } else { | ||
| log.Infof("Starting webserver at %v (TLS)", addr) | ||
| httpErr = http.ListenAndServeTLS(addr, config.TLSCertFile, config.TLSPrivateKeyFile, nil) | ||
| } | ||
|
|
||
| if httpErr != nil { | ||
| log.Fatal(httpErr) | ||
| } else { | ||
| log.Info("Finished") | ||
| } | ||
|
|
||
| } | ||
|
|
||
| func initLogger() { | ||
| log.SetOutput(os.Stdout) | ||
| log.SetLevel(log.DebugLevel) | ||
| } | ||
|
|
||
| func errorWithUsage(err error) { | ||
| log.Error(rootCmd.UsageString()) | ||
| log.Fatal(err) | ||
| } |
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