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package defaults
import (
"bytes"
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"strings"
"syscall"
"testing"
"github.com/pkg/xattr"
"github.com/rfjakob/gocryptfs/internal/cryptocore"
"github.com/rfjakob/gocryptfs/tests/test_helpers"
)
// On modern Linux distributions, /tmp may be on tmpfs,
// which does not support user xattrs. Try /var/tmp instead.
var alternateTestParentDir = "/var/tmp/gocryptfs-xattr-test-parent"
func TestMain(m *testing.M) {
if !xattrSupported(test_helpers.TmpDir) {
test_helpers.SwitchTestParentDir(alternateTestParentDir)
}
if !xattrSupported(test_helpers.TmpDir) {
fmt.Printf("xattrs not supported on %q", test_helpers.TmpDir)
os.Exit(1)
}
test_helpers.ResetTmpDir(true)
// Write deterministic diriv so encrypted filenames are deterministic.
os.Remove(test_helpers.DefaultCipherDir + "/gocryptfs.diriv")
diriv := []byte("1234567890123456")
err := ioutil.WriteFile(test_helpers.DefaultCipherDir+"/gocryptfs.diriv", diriv, 0400)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
test_helpers.MountOrExit(test_helpers.DefaultCipherDir, test_helpers.DefaultPlainDir, "-zerokey")
r := m.Run()
test_helpers.UnmountPanic(test_helpers.DefaultPlainDir)
os.RemoveAll(test_helpers.TmpDir)
os.Exit(r)
}
func TestXattrSetGetRm(t *testing.T) {
attr := "user.foo"
fn := test_helpers.DefaultPlainDir + "/TestXattrSetGetRm"
err := ioutil.WriteFile(fn, nil, 0700)
if err != nil {
t.Fatalf("creating empty file failed: %v", err)
}
// Set
val1 := []byte("123456789")
err = xattr.LSet(fn, attr, val1)
if err != nil {
t.Fatal(err)
}
// Read back
val2, err := xattr.LGet(fn, attr)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(val1, val2) {
t.Fatalf("wrong readback value: %v != %v", val1, val2)
}
// Remove
err = xattr.LRemove(fn, attr)
if err != nil {
t.Fatal(err)
}
// Read back
val3, err := xattr.LGet(fn, attr)
if err == nil {
t.Fatalf("attr is still there after deletion!? val3=%v", val3)
}
}
func TestXattrSetEmpty(t *testing.T) {
attr := "user.foo"
fn := test_helpers.DefaultPlainDir + "/TestXattrSetEmpty1"
err := ioutil.WriteFile(fn, nil, 0700)
if err != nil {
t.Fatalf("creating empty file failed: %v", err)
}
// Make sure it does not exist already
_, err = xattr.LGet(fn, attr)
if err == nil {
t.Fatal("we should have got an error here")
}
// Set empty value
err = xattr.LSet(fn, attr, nil)
if err != nil {
t.Fatal(err)
}
// Read back
val, err := xattr.LGet(fn, attr)
if err != nil {
t.Fatal(err)
}
if len(val) != 0 {
t.Errorf("wrong length: want=0 have=%d", len(val))
}
// Overwrite empty value with something
val1 := []byte("xyz123")
err = xattr.LSet(fn, attr, val1)
if err != nil {
t.Fatal(err)
}
// Read back
val2, err := xattr.LGet(fn, attr)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(val1, val2) {
t.Fatalf("wrong readback value: %v != %v", val1, val2)
}
// Overwrite something with empty value
err = xattr.LSet(fn, attr, nil)
if err != nil {
t.Fatal(err)
}
// Read back
val, err = xattr.LGet(fn, attr)
if err != nil {
t.Fatal(err)
}
if len(val) != 0 {
t.Errorf("wrong length: want=0 have=%d", len(val2))
}
}
func TestXattrList(t *testing.T) {
fn := test_helpers.DefaultPlainDir + "/TestXattrList"
err := ioutil.WriteFile(fn, nil, 0700)
if err != nil {
t.Fatalf("creating empty file failed: %v", err)
}
val := []byte("xxxxxxxxyyyyyyyyyyyyyyyzzzzzzzzzzzzz")
num := 20
for i := 1; i <= num; i++ {
attr := fmt.Sprintf("user.TestXattrList.%02d", i)
err = xattr.LSet(fn, attr, val)
if err != nil {
t.Fatal(err)
}
}
names, err := xattr.LList(fn)
if err != nil {
t.Fatal(err)
}
if len(names) != num {
t.Errorf("wrong number of names, want=%d have=%d", num, len(names))
}
for _, n := range names {
if !strings.HasPrefix(n, "user.TestXattrList.") {
t.Errorf("unexpected attr name: %q", n)
}
}
}
func xattrSupported(path string) bool {
_, err := xattr.LGet(path, "user.xattrSupported-dummy-value")
if err == nil {
return true
}
err2 := err.(*xattr.Error)
if err2.Err == syscall.EOPNOTSUPP {
return false
}
return true
}
func TestBase64XattrRead(t *testing.T) {
attrName := "user.test"
attrName2 := "user.test2"
encryptedAttrName := "user.gocryptfs.LB1kHHVrX1OEBdLmj3LTKw"
encryptedAttrName2 := "user.gocryptfs.d2yn5l7-0zUVqviADw-Oyw"
attrValue := fmt.Sprintf("test.%d", cryptocore.RandUint64())
fileName := "TestBase64Xattr"
encryptedFileName := "BaGak7jIoqAZQMlP0N5uCw"
plainFn := test_helpers.DefaultPlainDir + "/" + fileName
encryptedFn := test_helpers.DefaultCipherDir + "/" + encryptedFileName
err := ioutil.WriteFile(plainFn, nil, 0700)
if err != nil {
t.Fatalf("creating empty file failed: %v", err)
}
if _, err2 := os.Stat(encryptedFn); os.IsNotExist(err2) {
t.Fatalf("encrypted file does not exist: %v", err2)
}
xattr.LSet(plainFn, attrName, []byte(attrValue))
encryptedAttrValue, err1 := xattr.LGet(encryptedFn, encryptedAttrName)
if err1 != nil {
t.Fatal(err1)
}
xattr.LSet(encryptedFn, encryptedAttrName2, encryptedAttrValue)
plainValue, err := xattr.LGet(plainFn, attrName2)
if err != nil || string(plainValue) != attrValue {
t.Fatalf("Attribute binary value decryption error %s != %s %v", string(plainValue), attrValue, err)
}
encryptedAttrValue64 := base64.RawURLEncoding.EncodeToString(encryptedAttrValue)
xattr.LSet(encryptedFn, encryptedAttrName2, []byte(encryptedAttrValue64))
plainValue, err = xattr.LGet(plainFn, attrName2)
if err != nil || string(plainValue) != attrValue {
t.Fatalf("Attribute base64-encoded value decryption error %s != %s %v", string(plainValue), attrValue, err)
}
// Remount with -wpanic=false so gocryptfs does not panics when it sees
// the broken xattrs
test_helpers.UnmountPanic(test_helpers.DefaultPlainDir)
test_helpers.MountOrExit(test_helpers.DefaultCipherDir, test_helpers.DefaultPlainDir, "-zerokey", "-wpanic=false")
brokenVals := []string{
"111",
"raw-test-long-block123",
"raw-test-long-block123-xyz11111111111111111111111111111111111111",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
}
for _, val := range brokenVals {
xattr.LSet(encryptedFn, encryptedAttrName2, []byte(val))
plainValue, err = xattr.LGet(plainFn, attrName2)
err2, _ := err.(*xattr.Error)
if err == nil || err2.Err != syscall.EIO {
t.Fatalf("Incorrect handling of broken data %s %v", string(plainValue), err)
}
}
}
|
