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// This utility is used to generate the archives used as testdata for zipslip vulnerability
package main
//go:generate go run main.go ../testdata/zipslip
import (
"archive/tar"
"archive/zip"
"bytes"
"log"
"os"
"github.com/arduino/go-paths-helper"
)
func main() {
if len(os.Args) != 2 {
log.Fatal("Missing output directory")
}
outputDir := paths.New(os.Args[1])
if outputDir.IsNotDir() {
log.Fatalf("Output path %s is not a directory", outputDir)
}
generateEvilZipSlip(outputDir)
generateEvilSymLinkPathTraversalTar(outputDir)
}
func generateEvilZipSlip(outputDir *paths.Path) {
evilPathTraversalFiles := []string{
"..",
"../../../../../../../../../../../../../../../../../../../../tmp/evil.txt",
"some/path/../../../../../../../../../../../../../../../../../../../../tmp/evil.txt",
"/../../../../../../../../../../../../../../../../../../../../tmp/evil.txt",
"/some/path/../../../../../../../../../../../../../../../../../../../../tmp/evil.txt",
}
winSpecificPathTraversalFiles := []string{
"..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\tmp\\evil.txt",
"some\\path\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\tmp\\evil.txt",
"\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\tmp\\evil.txt",
"\\some\\path\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\..\\tmp\\evil.txt",
}
winSpecificPathTraversalFiles = append(winSpecificPathTraversalFiles, evilPathTraversalFiles...)
// Generate evil zip
{
buf := new(bytes.Buffer)
w := zip.NewWriter(buf)
for _, file := range winSpecificPathTraversalFiles {
if f, err := w.Create(file); err != nil {
log.Fatal(err)
} else if _, err = f.Write([]byte("TEST")); err != nil {
log.Fatal(err)
}
}
if err := w.Close(); err != nil {
log.Fatal(err)
}
if err := outputDir.Join("evil.zip").WriteFile(buf.Bytes()); err != nil {
log.Fatal(err)
}
}
// Generate evil tar
{
buf := new(bytes.Buffer)
w := tar.NewWriter(buf)
for _, file := range evilPathTraversalFiles {
if err := w.WriteHeader(&tar.Header{
Name: file,
Size: 4,
Mode: 0666,
}); err != nil {
log.Fatal(err)
}
if _, err := w.Write([]byte("TEST")); err != nil {
log.Fatal(err)
}
}
if err := w.Close(); err != nil {
log.Fatal(err)
}
if err := outputDir.Join("evil.tar").WriteFile(buf.Bytes()); err != nil {
log.Fatal(err)
}
}
// Generate evil tar for windows
{
buf := new(bytes.Buffer)
w := tar.NewWriter(buf)
for _, file := range winSpecificPathTraversalFiles {
if err := w.WriteHeader(&tar.Header{
Name: file,
Size: 4,
Mode: 0666,
}); err != nil {
log.Fatal(err)
}
if _, err := w.Write([]byte("TEST")); err != nil {
log.Fatal(err)
}
}
if err := w.Close(); err != nil {
log.Fatal(err)
}
if err := outputDir.Join("evil-win.tar").WriteFile(buf.Bytes()); err != nil {
log.Fatal(err)
}
}
}
func generateEvilSymLinkPathTraversalTar(outputDir *paths.Path) {
outputTarFile, err := outputDir.Join("evil-link-traversal.tar").Create()
if err != nil {
log.Fatal(err)
}
defer outputTarFile.Close()
tw := tar.NewWriter(outputTarFile)
defer tw.Close()
if err := tw.WriteHeader(&tar.Header{
Name: "leak", Linkname: "../../../../../../../../../../../../../../../tmp/something-important",
Mode: 0o0777, Size: 0, Typeflag: tar.TypeLink,
}); err != nil {
log.Fatal(err)
}
}
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