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/*
* policy_test.go - Tests the getting/setting of encryption policies
*
* Copyright 2017 Google Inc.
* Author: Joe Richey (joerichey@google.com)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package metadata
import (
"fmt"
"os"
"path/filepath"
"testing"
"golang.org/x/sys/unix"
"google.golang.org/protobuf/proto"
"github.com/google/fscrypt/util"
)
const goodV1Descriptor = "0123456789abcdef"
var goodV1Policy = &PolicyData{
KeyDescriptor: goodV1Descriptor,
Options: DefaultOptions,
}
var goodV2EncryptionOptions = &EncryptionOptions{
Padding: 32,
Contents: EncryptionOptions_AES_256_XTS,
Filenames: EncryptionOptions_AES_256_CTS,
PolicyVersion: 2,
}
var goodV2Policy = &PolicyData{
KeyDescriptor: "0123456789abcdef0123456789abcdef",
Options: goodV2EncryptionOptions,
}
// Creates a temporary directory for testing.
func createTestDirectory(t *testing.T) (directory string, err error) {
baseDirectory, err := util.TestRoot()
if err != nil {
t.Skip(err)
}
if s, err := os.Stat(baseDirectory); err != nil || !s.IsDir() {
return "", fmt.Errorf("test directory %q is not valid", baseDirectory)
}
directoryPath := filepath.Join(baseDirectory, "test")
return directoryPath, os.MkdirAll(directoryPath, os.ModePerm)
}
// Makes a test directory, makes a file in the directory, and fills the file
// with data. Returns the directory name, file name, and error (if one).
func createTestFile(t *testing.T) (directory, file string, err error) {
if directory, err = createTestDirectory(t); err != nil {
return
}
// Cleanup if the file creation fails
defer func() {
if err != nil {
os.RemoveAll(directory)
}
}()
filePath := filepath.Join(directory, "test.txt")
fileHandle, err := os.Create(filePath)
if err != nil {
return directory, filePath, err
}
defer fileHandle.Close()
_, err = fileHandle.Write([]byte("Here is some test data!\n"))
return directory, filePath, err
}
// Tests that we can set a policy on an empty directory
func TestSetPolicyEmptyDirectory(t *testing.T) {
directory, err := createTestDirectory(t)
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(directory)
if err = SetPolicy(directory, goodV1Policy); err != nil {
t.Error(err)
}
}
// Tests that we cannot set a policy on a nonempty directory
func TestSetPolicyNonemptyDirectory(t *testing.T) {
directory, _, err := createTestFile(t)
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(directory)
if err = SetPolicy(directory, goodV1Policy); err == nil {
t.Error("should have failed to set policy on a nonempty directory")
}
}
// Tests that we cannot set a policy on a file
func TestSetPolicyFile(t *testing.T) {
directory, file, err := createTestFile(t)
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(directory)
if err = SetPolicy(file, goodV1Policy); err == nil {
t.Error("should have failed to set policy on a file")
}
}
// Tests that we fail when using bad policies
func TestSetPolicyBadDescriptors(t *testing.T) {
// Policies that are too short, have invalid chars, or are too long
badDescriptors := []string{"123456789abcde", "xxxxxxxxxxxxxxxx", "0123456789abcdef00"}
for _, badDescriptor := range badDescriptors {
badPolicy := &PolicyData{KeyDescriptor: badDescriptor, Options: DefaultOptions}
directory, err := createTestDirectory(t)
if err != nil {
t.Fatal(err)
}
if err = SetPolicy(directory, badPolicy); err == nil {
t.Errorf("descriptor %q should have made SetPolicy fail", badDescriptor)
}
os.RemoveAll(directory)
}
}
// Tests that we get back the same policy that we set on a directory
func TestGetPolicyEmptyDirectory(t *testing.T) {
directory, err := createTestDirectory(t)
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(directory)
var actualPolicy *PolicyData
if err = SetPolicy(directory, goodV1Policy); err != nil {
t.Fatal(err)
}
if actualPolicy, err = GetPolicy(directory); err != nil {
t.Fatal(err)
}
if !proto.Equal(actualPolicy, goodV1Policy) {
t.Errorf("policy %+v does not equal expected policy %+v", actualPolicy, goodV1Policy)
}
}
// Tests that we cannot get a policy on an unencrypted directory
func TestGetPolicyUnencrypted(t *testing.T) {
directory, err := createTestDirectory(t)
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(directory)
if _, err = GetPolicy(directory); err == nil {
t.Error("should have failed to set policy on a file")
}
}
func requireV2PolicySupport(t *testing.T, directory string) {
file, err := os.Open(directory)
if err != nil {
t.Fatal(err)
}
defer file.Close()
err = policyIoctl(file, unix.FS_IOC_GET_ENCRYPTION_POLICY_EX, nil)
if err == ErrEncryptionNotSupported {
t.Skip("No support for v2 encryption policies, skipping test")
}
}
// Tests that a non-root user cannot set a v2 encryption policy unless the key
// has been added.
func TestSetV2PolicyNoKey(t *testing.T) {
if util.IsUserRoot() {
t.Skip("This test cannot be run as root")
}
directory, err := createTestDirectory(t)
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(directory)
requireV2PolicySupport(t, directory)
err = SetPolicy(directory, goodV2Policy)
if err == nil {
t.Error("shouldn't have been able to set v2 policy without key added")
}
}
|
