/
sysdump.go
299 lines (264 loc) · 7 KB
/
sysdump.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2021 Authors of KubeArmor
// Package sysdump collects and dumps information for troubleshooting KubeArmor
package sysdump
import (
"bytes"
"context"
"fmt"
"io"
"os"
"path"
"strings"
"time"
"golang.org/x/sync/errgroup"
kg "github.com/kubearmor/KubeArmor/KubeArmor/log"
"github.com/kubearmor/kubearmor-client/k8s"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/cli-runtime/pkg/printers"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/tools/remotecommand"
"github.com/mholt/archiver/v3"
)
// Options options for sysdump
type Options struct {
Filename string
}
// Collect Function
func Collect(c *k8s.Client, o Options) error {
var errs errgroup.Group
d, err := os.MkdirTemp("", "karmor-sysdump")
if err != nil {
return err
}
// k8s Server Version
errs.Go(func() error {
v, err := c.K8sClientset.Discovery().ServerVersion()
if err != nil {
return err
}
if err := writeToFile(path.Join(d, "version.txt"), v.String()); err != nil {
return err
}
return nil
})
// Node Info
errs.Go(func() error {
v, err := c.K8sClientset.CoreV1().Nodes().List(context.Background(), metav1.ListOptions{})
if err != nil {
return err
}
if err := writeYaml(path.Join(d, "node-info.yaml"), v); err != nil {
return err
}
return nil
})
// KubeArmor DaemonSet
errs.Go(func() error {
v, err := c.K8sClientset.AppsV1().DaemonSets("").List(context.Background(), metav1.ListOptions{
LabelSelector: "kubearmor-app=kubearmor",
})
if err != nil {
fmt.Printf("kubearmor daemonset not found. (possible if kubearmor is running in process mode)\n")
return nil
}
if err := writeYaml(path.Join(d, "kubearmor-daemonset.yaml"), v); err != nil {
return err
}
return nil
})
// KubeArmor Security Policies
errs.Go(func() error {
v, err := c.KSPClientset.KubeArmorPolicies("").List(context.Background(), metav1.ListOptions{})
if err != nil {
fmt.Printf("kubearmor CRD not found!\n")
return nil
}
if err := writeYaml(path.Join(d, "ksp.yaml"), v); err != nil {
return err
}
return nil
})
// KubeArmor Pod
errs.Go(func() error {
pods, err := c.K8sClientset.CoreV1().Pods("").List(context.Background(), metav1.ListOptions{
LabelSelector: "kubearmor-app=kubearmor",
})
if err != nil {
fmt.Printf("kubearmor pod not found. (possible if kubearmor is running in process mode)\n")
return nil
}
for _, p := range pods.Items {
// KubeArmor Logs
fmt.Printf("getting logs from %s\n", p.Name)
v := c.K8sClientset.CoreV1().Pods(p.Namespace).GetLogs(p.Name, &corev1.PodLogOptions{})
s, err := v.Stream(context.Background())
if err != nil {
fmt.Printf("failed getting logs from pod=%s err=%s\n", p.Name, err)
continue
}
defer func() {
if err := s.Close(); err != nil {
kg.Warnf("Error closing io stream %s\n", err)
}
}()
var logs bytes.Buffer
if _, err = io.Copy(&logs, s); err != nil {
return err
}
if err := writeToFile(path.Join(d, "ka-pod-"+p.Name+"-log.txt"), logs.String()); err != nil {
return err
}
// KubeArmor Describe
pod, err := c.K8sClientset.CoreV1().Pods(p.Namespace).Get(context.Background(), p.Name, metav1.GetOptions{})
if err != nil {
return err
}
if err := writeYaml(path.Join(d, "ka-pod-"+p.Name+".yaml"), pod); err != nil {
return err
}
// KubeArmor Event
e, err := c.K8sClientset.CoreV1().Events(p.Namespace).Search(scheme.Scheme, pod)
if err != nil {
return err
}
if err := writeYaml(path.Join(d, "ka-pod-events-"+p.Name+".yaml"), e); err != nil {
return err
}
}
return nil
})
// Annotated Pods Description
errs.Go(func() error {
pods, err := c.K8sClientset.CoreV1().Pods("").List(context.Background(), metav1.ListOptions{})
if err != nil {
return err
}
for _, p := range pods.Items {
v, err := c.K8sClientset.CoreV1().Pods(p.Namespace).Get(context.Background(), p.Name, metav1.GetOptions{})
if err != nil {
return err
}
if err := writeYaml(path.Join(d, p.Namespace+"-pod-"+p.Name+".yaml"), v); err != nil {
return err
}
e, err := c.K8sClientset.CoreV1().Events(p.Namespace).Search(scheme.Scheme, v)
if err != nil {
return err
}
if err := writeYaml(path.Join(d, p.Namespace+"-pod-events-"+p.Name+".yaml"), e); err != nil {
return err
}
}
return nil
})
// AppArmor Gzip
errs.Go(func() error {
if err := copyFromPod("/etc/apparmor.d", d, c); err != nil {
return err
}
return nil
})
dumpError := errs.Wait()
emptyDump, err := IsDirEmpty(d)
if err != nil {
return err
}
if emptyDump {
return dumpError
}
sysdumpFile := ""
if o.Filename == "" {
sysdumpFile = "karmor-sysdump-" + strings.Replace(time.Now().Format(time.UnixDate), ":", "_", -1) + ".zip"
} else {
sysdumpFile = o.Filename
}
if err := archiver.Archive([]string{d}, sysdumpFile); err != nil {
return fmt.Errorf("failed to create zip file: %w", err)
}
if err := os.RemoveAll(d); err != nil {
return err
}
fmt.Printf("Sysdump at %s\n", sysdumpFile)
if dumpError != nil {
return dumpError
}
return nil
}
func writeToFile(p, v string) error {
return os.WriteFile(p, []byte(v), 0600)
}
func writeYaml(p string, o runtime.Object) error {
var j printers.YAMLPrinter
w, err := printers.NewTypeSetter(scheme.Scheme).WrapToPrinter(&j, nil)
if err != nil {
return err
}
var b bytes.Buffer
if err := w.PrintObj(o, &b); err != nil {
return err
}
return writeToFile(p, b.String())
}
func copyFromPod(srcPath string, d string, c *k8s.Client) error {
pods, err := c.K8sClientset.CoreV1().Pods("").List(context.Background(), metav1.ListOptions{
LabelSelector: "kubearmor-app=kubearmor",
})
if err != nil {
fmt.Printf("kubearmor not deployed in pod mode\n")
return nil
}
for _, pod := range pods.Items {
destPath := path.Join(d, fmt.Sprintf("%s_apparmor.tar.gz", pod.Name))
reader, outStream := io.Pipe()
cmdArr := []string{"tar", "cf", "-", srcPath}
req := c.K8sClientset.CoreV1().RESTClient().
Get().
Namespace(pod.Namespace).
Resource("pods").
Name(pod.Name).
SubResource("exec").
VersionedParams(&corev1.PodExecOptions{
Container: pods.Items[0].Spec.Containers[0].Name,
Command: cmdArr,
Stdin: true,
Stdout: true,
Stderr: true,
TTY: false,
}, scheme.ParameterCodec)
exec, err := remotecommand.NewSPDYExecutor(c.Config, "POST", req.URL())
if err != nil {
return err
}
go func() {
defer outStream.Close()
err = exec.Stream(remotecommand.StreamOptions{
Stdin: os.Stdin,
Stdout: outStream,
Stderr: os.Stderr,
Tty: false,
})
}()
buf, err := io.ReadAll(reader)
if err != nil {
return err
}
if err := os.WriteFile(destPath, buf, 0600); err != nil {
return err
}
}
return nil
}
// IsDirEmpty Function
func IsDirEmpty(name string) (bool, error) {
files, err := os.ReadDir(name)
if err != nil {
return false, err
}
if len(files) != 0 {
return false, nil
}
return true, nil
}