mirror of https://github.com/octoleo/restic.git
452 lines
10 KiB
Go
452 lines
10 KiB
Go
package repository
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import (
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"bytes"
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"context"
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"encoding/json"
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"io"
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"math/rand"
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"sort"
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"strings"
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"testing"
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"github.com/cenkalti/backoff/v4"
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"github.com/google/go-cmp/cmp"
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"github.com/klauspost/compress/zstd"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/crypto"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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rtest "github.com/restic/restic/internal/test"
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)
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type mapcache map[backend.Handle]bool
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func (c mapcache) Has(h backend.Handle) bool { return c[h] }
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func TestSortCachedPacksFirst(t *testing.T) {
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var (
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blobs, sorted [100]restic.PackedBlob
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cache = make(mapcache)
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r = rand.New(rand.NewSource(1261))
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)
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for i := 0; i < len(blobs); i++ {
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var id restic.ID
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r.Read(id[:])
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blobs[i] = restic.PackedBlob{PackID: id}
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if i%3 == 0 {
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h := backend.Handle{Name: id.String(), Type: backend.PackFile}
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cache[h] = true
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}
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}
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copy(sorted[:], blobs[:])
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sort.SliceStable(sorted[:], func(i, j int) bool {
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hi := backend.Handle{Type: backend.PackFile, Name: sorted[i].PackID.String()}
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hj := backend.Handle{Type: backend.PackFile, Name: sorted[j].PackID.String()}
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return cache.Has(hi) && !cache.Has(hj)
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})
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sortCachedPacksFirst(cache, blobs[:])
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rtest.Equals(t, sorted, blobs)
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}
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func BenchmarkSortCachedPacksFirst(b *testing.B) {
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const nblobs = 512 // Corresponds to a file of ca. 2GB.
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var (
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blobs [nblobs]restic.PackedBlob
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cache = make(mapcache)
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r = rand.New(rand.NewSource(1261))
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)
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for i := 0; i < nblobs; i++ {
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var id restic.ID
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r.Read(id[:])
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blobs[i] = restic.PackedBlob{PackID: id}
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if i%3 == 0 {
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h := backend.Handle{Name: id.String(), Type: backend.PackFile}
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cache[h] = true
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}
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}
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var cpy [nblobs]restic.PackedBlob
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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copy(cpy[:], blobs[:])
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sortCachedPacksFirst(cache, cpy[:])
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}
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}
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// buildPackfileWithoutHeader returns a manually built pack file without a header.
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func buildPackfileWithoutHeader(blobSizes []int, key *crypto.Key, compress bool) (blobs []restic.Blob, packfile []byte) {
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opts := []zstd.EOption{
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// Set the compression level configured.
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zstd.WithEncoderLevel(zstd.SpeedDefault),
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// Disable CRC, we have enough checks in place, makes the
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// compressed data four bytes shorter.
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zstd.WithEncoderCRC(false),
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// Set a window of 512kbyte, so we have good lookbehind for usual
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// blob sizes.
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zstd.WithWindowSize(512 * 1024),
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}
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enc, err := zstd.NewWriter(nil, opts...)
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if err != nil {
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panic(err)
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}
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var offset uint
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for i, size := range blobSizes {
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plaintext := rtest.Random(800+i, size)
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id := restic.Hash(plaintext)
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uncompressedLength := uint(0)
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if compress {
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uncompressedLength = uint(len(plaintext))
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plaintext = enc.EncodeAll(plaintext, nil)
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}
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// we use a deterministic nonce here so the whole process is
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// deterministic, last byte is the blob index
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var nonce = []byte{
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0x15, 0x98, 0xc0, 0xf7, 0xb9, 0x65, 0x97, 0x74,
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0x12, 0xdc, 0xd3, 0x62, 0xa9, 0x6e, 0x20, byte(i),
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}
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before := len(packfile)
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packfile = append(packfile, nonce...)
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packfile = key.Seal(packfile, nonce, plaintext, nil)
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after := len(packfile)
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ciphertextLength := after - before
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blobs = append(blobs, restic.Blob{
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BlobHandle: restic.BlobHandle{
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Type: restic.DataBlob,
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ID: id,
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},
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Length: uint(ciphertextLength),
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UncompressedLength: uncompressedLength,
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Offset: offset,
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})
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offset = uint(len(packfile))
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}
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return blobs, packfile
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}
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func TestStreamPack(t *testing.T) {
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TestAllVersions(t, testStreamPack)
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}
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func testStreamPack(t *testing.T, version uint) {
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// always use the same key for deterministic output
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const jsonKey = `{"mac":{"k":"eQenuI8adktfzZMuC8rwdA==","r":"k8cfAly2qQSky48CQK7SBA=="},"encrypt":"MKO9gZnRiQFl8mDUurSDa9NMjiu9MUifUrODTHS05wo="}`
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var key crypto.Key
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err := json.Unmarshal([]byte(jsonKey), &key)
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if err != nil {
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t.Fatal(err)
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}
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blobSizes := []int{
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5522811,
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10,
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5231,
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18812,
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123123,
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13522811,
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12301,
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892242,
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28616,
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13351,
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252287,
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188883,
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3522811,
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18883,
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}
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var compress bool
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switch version {
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case 1:
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compress = false
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case 2:
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compress = true
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default:
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t.Fatal("test does not support repository version", version)
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}
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packfileBlobs, packfile := buildPackfileWithoutHeader(blobSizes, &key, compress)
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loadCalls := 0
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shortFirstLoad := false
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loadBytes := func(length int, offset int64) []byte {
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data := packfile
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if offset > int64(len(data)) {
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offset = 0
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length = 0
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}
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data = data[offset:]
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if length > len(data) {
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length = len(data)
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}
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if shortFirstLoad {
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length /= 2
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shortFirstLoad = false
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}
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return data[:length]
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}
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load := func(ctx context.Context, h backend.Handle, length int, offset int64, fn func(rd io.Reader) error) error {
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data := loadBytes(length, offset)
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if shortFirstLoad {
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data = data[:len(data)/2]
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shortFirstLoad = false
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}
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loadCalls++
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err := fn(bytes.NewReader(data))
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if err == nil {
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return nil
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}
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var permanent *backoff.PermanentError
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if errors.As(err, &permanent) {
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return err
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}
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// retry loading once
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return fn(bytes.NewReader(loadBytes(length, offset)))
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}
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// first, test regular usage
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t.Run("regular", func(t *testing.T) {
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tests := []struct {
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blobs []restic.Blob
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calls int
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shortFirstLoad bool
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}{
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{packfileBlobs[1:2], 1, false},
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{packfileBlobs[2:5], 1, false},
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{packfileBlobs[2:8], 1, false},
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{[]restic.Blob{
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packfileBlobs[0],
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packfileBlobs[4],
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packfileBlobs[2],
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}, 1, false},
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{[]restic.Blob{
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packfileBlobs[0],
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packfileBlobs[len(packfileBlobs)-1],
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}, 2, false},
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{packfileBlobs[:], 1, true},
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}
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for _, test := range tests {
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t.Run("", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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gotBlobs := make(map[restic.ID]int)
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handleBlob := func(blob restic.BlobHandle, buf []byte, err error) error {
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gotBlobs[blob.ID]++
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id := restic.Hash(buf)
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if !id.Equal(blob.ID) {
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t.Fatalf("wrong id %v for blob %s returned", id, blob.ID)
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}
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return err
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}
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wantBlobs := make(map[restic.ID]int)
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for _, blob := range test.blobs {
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wantBlobs[blob.ID] = 1
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}
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loadCalls = 0
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shortFirstLoad = test.shortFirstLoad
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err = streamPack(ctx, load, &key, restic.ID{}, test.blobs, handleBlob)
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if err != nil {
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t.Fatal(err)
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}
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if !cmp.Equal(wantBlobs, gotBlobs) {
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t.Fatal(cmp.Diff(wantBlobs, gotBlobs))
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}
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rtest.Equals(t, test.calls, loadCalls)
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})
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}
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})
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shortFirstLoad = false
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// next, test invalid uses, which should return an error
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t.Run("invalid", func(t *testing.T) {
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tests := []struct {
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blobs []restic.Blob
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err string
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}{
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{
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// pass one blob several times
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blobs: []restic.Blob{
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packfileBlobs[3],
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packfileBlobs[8],
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packfileBlobs[3],
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packfileBlobs[4],
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},
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err: "overlapping blobs in pack",
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},
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{
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// pass something that's not a valid blob in the current pack file
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blobs: []restic.Blob{
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{
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Offset: 123,
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Length: 20000,
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},
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},
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err: "ciphertext verification failed",
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},
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{
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// pass a blob that's too small
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blobs: []restic.Blob{
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{
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Offset: 123,
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Length: 10,
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},
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},
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err: "invalid blob length",
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},
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}
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for _, test := range tests {
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t.Run("", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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handleBlob := func(blob restic.BlobHandle, buf []byte, err error) error {
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return err
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}
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err = streamPack(ctx, load, &key, restic.ID{}, test.blobs, handleBlob)
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if err == nil {
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t.Fatalf("wanted error %v, got nil", test.err)
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}
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if !strings.Contains(err.Error(), test.err) {
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t.Fatalf("wrong error returned, it should contain %q but was %q", test.err, err)
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}
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})
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}
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})
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}
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func TestBlobVerification(t *testing.T) {
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repo := TestRepository(t).(*Repository)
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type DamageType string
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const (
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damageData DamageType = "data"
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damageCompressed DamageType = "compressed"
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damageCiphertext DamageType = "ciphertext"
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)
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for _, test := range []struct {
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damage DamageType
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msg string
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}{
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{"", ""},
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{damageData, "hash mismatch"},
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{damageCompressed, "decompression failed"},
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{damageCiphertext, "ciphertext verification failed"},
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} {
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plaintext := rtest.Random(800, 1234)
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id := restic.Hash(plaintext)
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if test.damage == damageData {
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plaintext[42] ^= 0x42
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}
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uncompressedLength := uint(len(plaintext))
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plaintext = repo.getZstdEncoder().EncodeAll(plaintext, nil)
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if test.damage == damageCompressed {
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plaintext = plaintext[:len(plaintext)-8]
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}
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nonce := crypto.NewRandomNonce()
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ciphertext := append([]byte{}, nonce...)
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ciphertext = repo.Key().Seal(ciphertext, nonce, plaintext, nil)
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if test.damage == damageCiphertext {
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ciphertext[42] ^= 0x42
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}
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err := repo.verifyCiphertext(ciphertext, int(uncompressedLength), id)
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if test.msg == "" {
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rtest.Assert(t, err == nil, "expected no error, got %v", err)
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} else {
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rtest.Assert(t, strings.Contains(err.Error(), test.msg), "expected error to contain %q, got %q", test.msg, err)
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}
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}
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}
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func TestUnpackedVerification(t *testing.T) {
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repo := TestRepository(t).(*Repository)
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type DamageType string
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const (
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damageData DamageType = "data"
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damageCompressed DamageType = "compressed"
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damageCiphertext DamageType = "ciphertext"
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)
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for _, test := range []struct {
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damage DamageType
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msg string
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}{
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{"", ""},
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{damageData, "data mismatch"},
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{damageCompressed, "decompression failed"},
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{damageCiphertext, "ciphertext verification failed"},
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} {
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plaintext := rtest.Random(800, 1234)
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orig := append([]byte{}, plaintext...)
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if test.damage == damageData {
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plaintext[42] ^= 0x42
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}
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compressed := []byte{2}
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compressed = repo.getZstdEncoder().EncodeAll(plaintext, compressed)
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if test.damage == damageCompressed {
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compressed = compressed[:len(compressed)-8]
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}
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nonce := crypto.NewRandomNonce()
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ciphertext := append([]byte{}, nonce...)
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ciphertext = repo.Key().Seal(ciphertext, nonce, compressed, nil)
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if test.damage == damageCiphertext {
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ciphertext[42] ^= 0x42
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}
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err := repo.verifyUnpacked(ciphertext, restic.IndexFile, orig)
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if test.msg == "" {
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rtest.Assert(t, err == nil, "expected no error, got %v", err)
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} else {
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rtest.Assert(t, strings.Contains(err.Error(), test.msg), "expected error to contain %q, got %q", test.msg, err)
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}
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}
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}
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