syncthing/lib/protocol/encryption_test.go

257 lines
6.1 KiB
Go

// Copyright (C) 2019 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package protocol
import (
"bytes"
"fmt"
"reflect"
"regexp"
"strings"
"sync"
"testing"
"github.com/syncthing/syncthing/lib/rand"
"github.com/syncthing/syncthing/lib/sha256"
)
func TestEnDecryptName(t *testing.T) {
pattern := regexp.MustCompile(
fmt.Sprintf("^[0-9A-V]%s/[0-9A-V]{2}/([0-9A-V]{%d}/)*[0-9A-V]{1,%d}$",
regexp.QuoteMeta(encryptedDirExtension),
maxPathComponent, maxPathComponent-1))
makeName := func(n int) string {
b := make([]byte, n)
for i := range b {
b[i] = byte('a' + i%26)
}
return string(b)
}
var key [32]byte
cases := []string{
"",
"foo",
"a longer name/with/slashes and spaces",
makeName(maxPathComponent),
makeName(1 + maxPathComponent),
makeName(2 * maxPathComponent),
makeName(1 + 2*maxPathComponent),
}
for _, tc := range cases {
var prev string
for i := 0; i < 5; i++ {
enc := encryptName(tc, &key)
if prev != "" && prev != enc {
t.Error("name should always encrypt the same")
}
prev = enc
if tc != "" && strings.Contains(enc, tc) {
t.Error("shouldn't contain plaintext")
}
if !pattern.MatchString(enc) {
t.Fatalf("encrypted name %s doesn't match %s",
enc, pattern)
}
dec, err := decryptName(enc, &key)
if err != nil {
t.Error(err)
}
if dec != tc {
t.Error("mismatch after decryption")
}
t.Logf("%q encrypts as %q", tc, enc)
}
}
}
func TestKeyDerivation(t *testing.T) {
folderKey := KeyFromPassword("my folder", "my password")
encryptedName := encryptDeterministic([]byte("filename.txt"), folderKey, nil)
if base32Hex.EncodeToString(encryptedName) != "3T5957I4IOA20VEIEER6JSQG0PEPIRV862II3K7LOF75Q" {
t.Error("encrypted name mismatch")
}
fileKey := FileKey("filename.txt", folderKey)
// fmt.Println(base32Hex.EncodeToString(encryptBytes([]byte("hello world"), fileKey))) => A1IPD...
const encrypted = `A1IPD28ISL7VNPRSSSQM2L31L3IJPC08283RO89J5UG0TI9P38DO9RFGK12DK0KD7PKQP6U51UL2B6H96O`
bs, _ := base32Hex.DecodeString(encrypted)
dec, err := DecryptBytes(bs, fileKey)
if err != nil {
t.Error(err)
}
if string(dec) != "hello world" {
t.Error("decryption mismatch")
}
}
func TestDecryptNameInvalid(t *testing.T) {
key := new([32]byte)
for _, c := range []string{
"T.syncthing-enc/OD",
"T.syncthing-enc/OD/",
"T.wrong-extension/OD/PHVDD67S7FI2K5QQMPSOFSK",
"OD/PHVDD67S7FI2K5QQMPSOFSK",
} {
if _, err := decryptName(c, key); err == nil {
t.Errorf("no error for %q", c)
}
}
}
func TestEnDecryptBytes(t *testing.T) {
var key [32]byte
cases := [][]byte{
{},
{1, 2, 3, 4, 5},
}
for _, tc := range cases {
var prev []byte
for i := 0; i < 5; i++ {
enc := encryptBytes(tc, &key)
if bytes.Equal(enc, prev) {
t.Error("encryption should not repeat")
}
prev = enc
if len(tc) > 0 && bytes.Contains(enc, tc) {
t.Error("shouldn't contain plaintext")
}
dec, err := DecryptBytes(enc, &key)
if err != nil {
t.Error(err)
}
if !bytes.Equal(dec, tc) {
t.Error("mismatch after decryption")
}
}
}
}
func encFileInfo() FileInfo {
return FileInfo{
Name: "hello",
Size: 45,
Permissions: 0755,
ModifiedS: 8080,
Sequence: 1000,
Blocks: []BlockInfo{
{
Offset: 0,
Size: 45,
Hash: []byte{1, 2, 3},
},
{
Offset: 45,
Size: 45,
Hash: []byte{1, 2, 3},
},
},
}
}
func TestEnDecryptFileInfo(t *testing.T) {
var key [32]byte
fi := encFileInfo()
enc := encryptFileInfo(fi, &key)
if bytes.Equal(enc.Blocks[0].Hash, enc.Blocks[1].Hash) {
t.Error("block hashes should not repeat when on different offsets")
}
if enc.RawBlockSize < MinBlockSize {
t.Error("Too small raw block size:", enc.RawBlockSize)
}
if enc.Sequence != fi.Sequence {
t.Error("encrypted fileinfo didn't maintain sequence number")
}
again := encryptFileInfo(fi, &key)
if !bytes.Equal(enc.Blocks[0].Hash, again.Blocks[0].Hash) {
t.Error("block hashes should remain stable (0)")
}
if !bytes.Equal(enc.Blocks[1].Hash, again.Blocks[1].Hash) {
t.Error("block hashes should remain stable (1)")
}
// Simulate the remote setting the sequence number when writing to db
enc.Sequence = 10
dec, err := DecryptFileInfo(enc, &key)
if err != nil {
t.Error(err)
}
if dec.Sequence != enc.Sequence {
t.Error("decrypted fileinfo didn't maintain sequence number")
}
dec.Sequence = fi.Sequence
if !reflect.DeepEqual(fi, dec) {
t.Error("mismatch after decryption")
}
}
func TestEncryptedFileInfoConsistency(t *testing.T) {
var key [32]byte
files := []FileInfo{
encFileInfo(),
encFileInfo(),
}
files[1].SetIgnored()
for i, f := range files {
enc := encryptFileInfo(f, &key)
if err := checkFileInfoConsistency(enc); err != nil {
t.Errorf("%v: %v", i, err)
}
}
}
func TestIsEncryptedParent(t *testing.T) {
comp := rand.String(maxPathComponent)
cases := []struct {
path string
is bool
}{
{"", false},
{".", false},
{"/", false},
{"12" + encryptedDirExtension, false},
{"1" + encryptedDirExtension, true},
{"1" + encryptedDirExtension + "/b", false},
{"1" + encryptedDirExtension + "/bc", true},
{"1" + encryptedDirExtension + "/bcd", false},
{"1" + encryptedDirExtension + "/bc/foo", false},
{"1.12/22", false},
{"1" + encryptedDirExtension + "/bc/" + comp, true},
{"1" + encryptedDirExtension + "/bc/" + comp + "/" + comp, true},
{"1" + encryptedDirExtension + "/bc/" + comp + "a", false},
{"1" + encryptedDirExtension + "/bc/" + comp + "/a/" + comp, false},
}
for _, tc := range cases {
if res := IsEncryptedParent(strings.Split(tc.path, "/")); res != tc.is {
t.Errorf("%v: got %v, expected %v", tc.path, res, tc.is)
}
}
}
var benchmarkFileKey struct {
key [keySize]byte
sync.Once
}
func BenchmarkFileKey(b *testing.B) {
benchmarkFileKey.Do(func() {
sha256.SelectAlgo()
rand.Read(benchmarkFileKey.key[:])
})
b.ResetTimer()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
FileKey("a_kind_of_long_filename.ext", &benchmarkFileKey.key)
}
}