/
kubernetes.go
324 lines (257 loc) · 8.17 KB
/
kubernetes.go
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package manifest
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"runtime"
"strings"
"github.com/plexsystems/sinker/internal/docker"
kubeyaml "github.com/ghodss/yaml"
promv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
batchv1beta1 "k8s.io/api/batch/v1beta1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// GetImagesFromKubernetesManifests returns all images found in Kubernetes manifests
// that are located at the specified path.
func GetImagesFromKubernetesManifests(path string) ([]string, error) {
resources, err := getResourceContentsFromYamlFiles(path)
if err != nil {
return nil, fmt.Errorf("get yaml files: %w", err)
}
images, err := GetImagesFromKubernetesResources(resources)
if err != nil {
return nil, fmt.Errorf("get images from resources: %w", err)
}
return images, nil
}
// GetImagesFromKubernetesResources returns all images found in Kubernetes resources that have
// already been read from the disk, or are being read from standard input.
func GetImagesFromKubernetesResources(resources []string) ([]string, error) {
var splitResources []string
for _, resourceContents := range resources {
var lineBreak string
if strings.Contains(resourceContents, "\r\n") && runtime.GOOS == "windows" {
lineBreak = "\r\n"
} else {
lineBreak = "\n"
}
individualResources := strings.Split(resourceContents, lineBreak+"---"+lineBreak)
splitResources = append(splitResources, individualResources...)
}
var imageList []string
for _, resource := range splitResources {
images, err := getImagesFromResource(resource)
if err != nil {
return nil, fmt.Errorf("get images from resource: %w", err)
}
imageList = append(imageList, images...)
}
imageList = dedupeImages(imageList)
return imageList, nil
}
func getResourceContentsFromYamlFiles(path string) ([]string, error) {
var filePaths []string
err := filepath.Walk(path, func(currentFilePath string, fileInfo os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("walk path: %w", err)
}
if fileInfo.IsDir() && fileInfo.Name() == ".git" {
return filepath.SkipDir
}
if fileInfo.IsDir() {
return nil
}
if filepath.Ext(currentFilePath) != ".yaml" && filepath.Ext(currentFilePath) != ".yml" {
return nil
}
filePaths = append(filePaths, currentFilePath)
return nil
})
if err != nil {
return nil, err
}
var fileContents []string
for _, filePath := range filePaths {
contents, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, fmt.Errorf("read file: %w", err)
}
fileContents = append(fileContents, string(contents))
}
return fileContents, nil
}
func getImagesFromResource(resource string) ([]string, error) {
byteResource := []byte(resource)
// If the resource does not contain a TypeMeta, it will not be a valid
// Kubernetes resource and can be assumed to have no images.
var typeMeta metav1.TypeMeta
if err := kubeyaml.Unmarshal(byteResource, &typeMeta); err != nil {
return []string{}, nil
}
if typeMeta.Kind == "Prometheus" {
prometheusImages, err := getPrometheusImages(byteResource)
if err != nil {
return nil, fmt.Errorf("get prometheus images: %w", err)
}
return prometheusImages, nil
}
if typeMeta.Kind == "Alertmanager" {
alertmanagerImages, err := getAlertmanagerImages(byteResource)
if err != nil {
return nil, fmt.Errorf("get alertmanager images: %w", err)
}
return alertmanagerImages, nil
}
if typeMeta.Kind == "Pod" {
podImages, err := getPodImages(byteResource)
if err != nil {
return nil, fmt.Errorf("get pod images: %w", err)
}
return podImages, nil
}
if typeMeta.Kind == "CronJob" {
cronJobImages, err := getCronJobImages(byteResource)
if err != nil {
return nil, fmt.Errorf("get cronjob images: %w", err)
}
return cronJobImages, nil
}
type BaseSpec struct {
Template corev1.PodTemplateSpec `json:"template" protobuf:"bytes,3,opt,name=template"`
}
type BaseType struct {
Spec BaseSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
}
var contents BaseType
if err := kubeyaml.Unmarshal(byteResource, &contents); err != nil {
return []string{}, nil
}
var images []string
images = append(images, getImagesFromContainers(contents.Spec.Template.Spec.InitContainers)...)
images = append(images, getImagesFromContainers(contents.Spec.Template.Spec.Containers)...)
return images, nil
}
func getPrometheusImages(resource []byte) ([]string, error) {
var prometheus promv1.Prometheus
if err := kubeyaml.Unmarshal(resource, &prometheus); err != nil {
return nil, fmt.Errorf("unmarshal prometheus: %w", err)
}
var prometheusImage string
if prometheus.Spec.BaseImage != "" {
prometheusImage = prometheus.Spec.BaseImage + ":" + prometheus.Spec.Version
} else {
prometheusImage = *prometheus.Spec.Image
}
var images []string
images = append(images, getImagesFromContainers(prometheus.Spec.Containers)...)
images = append(images, getImagesFromContainers(prometheus.Spec.InitContainers)...)
images = append(images, prometheusImage)
return images, nil
}
func getAlertmanagerImages(resource []byte) ([]string, error) {
var alertmanager promv1.Alertmanager
if err := kubeyaml.Unmarshal(resource, &alertmanager); err != nil {
return nil, fmt.Errorf("unmarshal alertmanager: %w", err)
}
var alertmanagerImage string
if alertmanager.Spec.BaseImage != "" {
alertmanagerImage = alertmanager.Spec.BaseImage + ":" + alertmanager.Spec.Version
} else {
alertmanagerImage = *alertmanager.Spec.Image
}
var images []string
images = append(images, getImagesFromContainers(alertmanager.Spec.Containers)...)
images = append(images, getImagesFromContainers(alertmanager.Spec.InitContainers)...)
images = append(images, alertmanagerImage)
return images, nil
}
func getPodImages(resource []byte) ([]string, error) {
var pod corev1.PodTemplateSpec
if err := kubeyaml.Unmarshal(resource, &pod); err != nil {
return nil, fmt.Errorf("unmarshal pod: %w", err)
}
var images []string
images = append(images, getImagesFromContainers(pod.Spec.Containers)...)
images = append(images, getImagesFromContainers(pod.Spec.InitContainers)...)
return images, nil
}
func getCronJobImages(resource []byte) ([]string, error) {
var cj batchv1beta1.CronJob
if err := kubeyaml.Unmarshal(resource, &cj); err != nil {
return nil, fmt.Errorf("unmarshal cronjob: %w", err)
}
var images []string
images = append(images, getImagesFromContainers(cj.Spec.JobTemplate.Spec.Template.Spec.Containers)...)
images = append(images, getImagesFromContainers(cj.Spec.JobTemplate.Spec.Template.Spec.InitContainers)...)
return images, nil
}
func getImagesFromContainers(containers []corev1.Container) []string {
var images []string
imgStringsToFilter := []string{
// Ignore token characters.
"$",
// Ignore image parameters that include a URL.
"http://",
"https://",
// Ignore Envoy/Istio log parameters
// (https://www.envoyproxy.io/docs/envoy/latest/start/quick-start/run-envoy.html#debugging-envoy)
":trace",
":debug",
":info",
":warn",
":error",
":critical",
":off",
}
// Looking for strings like 0.0.0.0:5332
regexToFilter := []string{".*\\d*\\.\\d*:\\d"}
for _, container := range containers {
images = append(images, container.Image)
for _, arg := range container.Args {
var image string
if strings.Contains(arg, "=") {
image = strings.Split(arg, "=")[1]
} else {
image = arg
}
if !strings.Contains(image, ":") || strings.Contains(image, "=:") {
continue
}
var skiploop bool
for _, imgString := range imgStringsToFilter {
if strings.Contains(image, imgString) {
skiploop = true
}
}
for _, regexpPattern := range regexToFilter {
found, _ := regexp.MatchString(regexpPattern, image)
if found {
skiploop = true
}
}
if skiploop {
continue
}
registryPath := docker.RegistryPath(image)
if registryPath.Repository() == "" {
continue
}
if strings.Contains(registryPath.Repository(), ":") {
continue
}
images = append(images, image)
}
}
return images
}
func contains(images []string, image string) bool {
for _, currentImage := range images {
if strings.EqualFold(currentImage, image) {
return true
}
}
return false
}