| 1 | package seal |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "crypto/aes" |
| 6 | "crypto/cipher" |
| 7 | "encoding/hex" |
| 8 | "sync" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | func testKey() []byte { |
| 13 | b := make([]byte, 32) |
| 14 | for i := range b { |
| 15 | b[i] = byte(i) |
| 16 | } |
| 17 | return b |
| 18 | } |
| 19 | |
| 20 | // These derivation vectors predate extraction, from Home's deployed sealer. |
| 21 | func TestHistoricalHomeVectors(t *testing.T) { |
| 22 | s, err := New(testKey(), "oficina/home") |
| 23 | if err != nil { |
| 24 | t.Fatal(err) |
| 25 | } |
| 26 | for purpose, want := range map[string]string{"signin.address": "1c677fc03245425f809a5a8ba5fda280f745ee96babd14ac8a75857ec9c7fe00", "team.name": "8cadd5d2a5921541918563b0046844c371de29743a4b9335759da8c345bfc732", "queue.payload": "2d6b4e963b93489c6a9515469f274516e48014d0bdb01831a9ff65086d0cb999"} { |
| 27 | key, err := s.purposeKey(purpose) |
| 28 | if err != nil || hex.EncodeToString(key) != want { |
| 29 | t.Fatal("historical key changed", purpose, err) |
| 30 | } |
| 31 | block, err := aes.NewCipher(key) |
| 32 | if err != nil { |
| 33 | t.Fatal(err) |
| 34 | } |
| 35 | aead, err := cipher.NewGCM(block) |
| 36 | if err != nil { |
| 37 | t.Fatal(err) |
| 38 | } |
| 39 | nonce := bytes.Repeat([]byte{0x5a}, aead.NonceSize()) |
| 40 | plaintext := []byte("historical fixture") |
| 41 | old := aead.Seal(append([]byte(nil), nonce...), nonce, plaintext, nil) |
| 42 | got, err := s.Open(purpose, old) |
| 43 | if err != nil || !bytes.Equal(got, plaintext) { |
| 44 | t.Fatal("old envelope unreadable", err) |
| 45 | } |
| 46 | current, err := s.Seal(purpose, plaintext) |
| 47 | if err != nil { |
| 48 | t.Fatal(err) |
| 49 | } |
| 50 | got, err = aead.Open(nil, current[:aead.NonceSize()], current[aead.NonceSize():], nil) |
| 51 | if err != nil || !bytes.Equal(got, plaintext) { |
| 52 | t.Fatal("old reader cannot read new envelope", err) |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | func TestNamespacePurposeKeyAndTamperIsolation(t *testing.T) { |
| 57 | s, _ := New(testKey(), "oficina/home") |
| 58 | ct, err := s.Seal("pending", []byte("private")) |
| 59 | if err != nil { |
| 60 | t.Fatal(err) |
| 61 | } |
| 62 | for _, ns := range []string{"oficina/docs/handoff", "oficina/sheets"} { |
| 63 | other, _ := New(testKey(), ns) |
| 64 | if _, err := other.Open("pending", ct); err == nil { |
| 65 | t.Fatal("namespace crossed") |
| 66 | } |
| 67 | } |
| 68 | if _, err := s.Open("inbox", ct); err == nil { |
| 69 | t.Fatal("purpose crossed") |
| 70 | } |
| 71 | other, _ := New(bytes.Repeat([]byte{99}, 32), "oficina/home") |
| 72 | if _, err := other.Open("pending", ct); err == nil { |
| 73 | t.Fatal("key crossed") |
| 74 | } |
| 75 | for i := range ct { |
| 76 | bad := append([]byte(nil), ct...) |
| 77 | bad[i] ^= 1 |
| 78 | if _, err := s.Open("pending", bad); err == nil { |
| 79 | t.Fatal("altered envelope accepted") |
| 80 | } |
| 81 | } |
| 82 | for i := 0; i < len(ct); i++ { |
| 83 | if _, err := s.Open("pending", ct[:i]); err == nil { |
| 84 | t.Fatal("truncated envelope accepted") |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | func TestConstructorCopiesKeyAndRejectsAmbiguousNamespaces(t *testing.T) { |
| 89 | key := testKey() |
| 90 | s, err := New(key, "oficina/home") |
| 91 | if err != nil { |
| 92 | t.Fatal(err) |
| 93 | } |
| 94 | clear(key) |
| 95 | expected, _ := New(testKey(), "oficina/home") |
| 96 | var wg sync.WaitGroup |
| 97 | for i := 0; i < 8; i++ { |
| 98 | wg.Add(1) |
| 99 | go func() { |
| 100 | defer wg.Done() |
| 101 | ct, err := s.Seal("parallel", []byte("value")) |
| 102 | if err != nil { |
| 103 | t.Error(err) |
| 104 | return |
| 105 | } |
| 106 | p, err := expected.Open("parallel", ct) |
| 107 | if err != nil || string(p) != "value" { |
| 108 | t.Error("caller key mutation changed sealer") |
| 109 | } |
| 110 | }() |
| 111 | } |
| 112 | wg.Wait() |
| 113 | for _, ns := range []string{"", "a:b", "a\n", "a b", string(bytes.Repeat([]byte{'a'}, 129))} { |
| 114 | if _, err := New(testKey(), ns); err == nil { |
| 115 | t.Fatal("invalid namespace accepted") |
| 116 | } |
| 117 | } |
| 118 | for _, n := range []int{0, 31, 33} { |
| 119 | if _, err := New(make([]byte, n), "oficina/home"); err == nil { |
| 120 | t.Fatal("invalid key length accepted") |
| 121 | } |
| 122 | } |
| 123 | } |
| 124 | |
amadan