| 1 | package maintenance |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "crypto/ecdh" |
| 7 | "crypto/rand" |
| 8 | "os" |
| 9 | "strconv" |
| 10 | "testing" |
| 11 | "time" |
| 12 | ) |
| 13 | |
| 14 | func resultPipe(t *testing.T) (*os.File, *os.File) { |
| 15 | t.Helper() |
| 16 | r, w, err := os.Pipe() |
| 17 | if err != nil { |
| 18 | t.Fatal(err) |
| 19 | } |
| 20 | t.Cleanup(func() { _ = r.Close(); _ = w.Close() }) |
| 21 | return r, w |
| 22 | } |
| 23 | func resultContext(t *testing.T) context.Context { |
| 24 | t.Helper() |
| 25 | ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) |
| 26 | t.Cleanup(cancel) |
| 27 | return ctx |
| 28 | } |
| 29 | |
| 30 | func TestCaptureResultCompleteBoundaries(t *testing.T) { |
| 31 | for _, n := range []int{0, 1, MaxResultBytes} { |
| 32 | t.Run(strconv.Itoa(n), func(t *testing.T) { |
| 33 | r, w := resultPipe(t) |
| 34 | body := bytes.Repeat([]byte{'x'}, n) |
| 35 | done := make(chan error, 1) |
| 36 | go func() { _, e := w.Write(body); _ = w.Close(); done <- e }() |
| 37 | got, err := CaptureResult(resultContext(t), r) |
| 38 | if err != nil || !bytes.Equal(got, body) { |
| 39 | t.Fatalf("size%d capture failed: %v", n, err) |
| 40 | } |
| 41 | if err := <-done; err != nil { |
| 42 | t.Fatal(err) |
| 43 | } |
| 44 | if _, err := r.Stat(); err == nil { |
| 45 | t.Fatal("capture retained its owned read pipe") |
| 46 | } |
| 47 | }) |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | func TestCaptureResultOverflowWithoutEOF(t *testing.T) { |
| 52 | r, w := resultPipe(t) |
| 53 | done := make(chan error, 1) |
| 54 | go func() { _, err := w.Write(bytes.Repeat([]byte{'x'}, MaxResultBytes+1)); done <- err }() |
| 55 | body, err := CaptureResult(resultContext(t), r) |
| 56 | if body != nil || err != ErrResultOverflow { |
| 57 | t.Fatalf("overflow = %d bytes, %v", len(body), err) |
| 58 | } |
| 59 | if err := <-done; err != nil { |
| 60 | t.Fatal(err) |
| 61 | } |
| 62 | // The write end is deliberately still open: overflow cannot require EOF. |
| 63 | if _, err := w.Stat(); err != nil { |
| 64 | t.Fatal("writer closed before overflow observation") |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | func TestCaptureResultCancellationDiscardsPartialBytes(t *testing.T) { |
| 69 | r, w := resultPipe(t) |
| 70 | ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) |
| 71 | defer cancel() |
| 72 | type answer struct { |
| 73 | body []byte |
| 74 | err error |
| 75 | } |
| 76 | done := make(chan answer, 1) |
| 77 | go func() { b, e := CaptureResult(ctx, r); done <- answer{b, e} }() |
| 78 | if _, err := w.Write([]byte("synthetic-private-fragment")); err != nil { |
| 79 | t.Fatal(err) |
| 80 | } |
| 81 | cancel() |
| 82 | select { |
| 83 | case got := <-done: |
| 84 | if got.body != nil || got.err != ErrResult { |
| 85 | t.Fatal("cancel returned partial bytes or success") |
| 86 | } |
| 87 | case <-time.After(time.Second): |
| 88 | t.Fatal("cancellation did not unblock the actual pipe") |
| 89 | } |
| 90 | if _, err := r.Stat(); err == nil { |
| 91 | t.Fatal("cancel retained read descriptor") |
| 92 | } |
| 93 | if _, err := w.Stat(); err != nil { |
| 94 | t.Fatal("capture claimed to terminate independent writer") |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | func TestCaptureResultRequiresEOFBeforeDeadline(t *testing.T) { |
| 99 | r, _ := resultPipe(t) |
| 100 | ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond) |
| 101 | defer cancel() |
| 102 | done := make(chan error, 1) |
| 103 | go func() { |
| 104 | b, e := CaptureResult(ctx, r) |
| 105 | if b != nil { |
| 106 | done <- nil |
| 107 | return |
| 108 | } |
| 109 | done <- e |
| 110 | }() |
| 111 | select { |
| 112 | case err := <-done: |
| 113 | if err != ErrResult { |
| 114 | t.Fatal("open writer accepted without EOF") |
| 115 | } |
| 116 | case <-time.After(time.Second): |
| 117 | t.Fatal("deadline did not close pipe") |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | func TestCaptureResultRefusesUnboundedOrNonpipeInput(t *testing.T) { |
| 122 | long, cancelLong := context.WithTimeout(context.Background(), MaxExecutionDuration+time.Minute) |
| 123 | defer cancelLong() |
| 124 | expired, cancelExpired := context.WithCancel(resultContext(t)) |
| 125 | cancelExpired() |
| 126 | for _, ctx := range []context.Context{nil, context.Background(), long, expired} { |
| 127 | r, _ := resultPipe(t) |
| 128 | if b, e := CaptureResult(ctx, r); b != nil || e != ErrResult { |
| 129 | t.Fatal("invalid context accepted") |
| 130 | } |
| 131 | if _, e := r.Stat(); e == nil { |
| 132 | t.Fatal("refusal retained read pipe") |
| 133 | } |
| 134 | } |
| 135 | f, e := os.CreateTemp(t.TempDir(), "regular") |
| 136 | if e != nil { |
| 137 | t.Fatal(e) |
| 138 | } |
| 139 | if b, e := CaptureResult(resultContext(t), f); b != nil || e != ErrResult { |
| 140 | t.Fatal("regular file accepted as private stdout") |
| 141 | } |
| 142 | if b, e := CaptureResult(resultContext(t), nil); b != nil || e != ErrResult { |
| 143 | t.Fatal("nil pipe accepted") |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | func TestResultEnvelopePurposeAndLimits(t *testing.T) { |
| 148 | key, err := ecdh.P256().GenerateKey(rand.Reader) |
| 149 | if err != nil { |
| 150 | t.Fatal(err) |
| 151 | } |
| 152 | fingerprint, err := RecipientFingerprint(key.PublicKey()) |
| 153 | if err != nil { |
| 154 | t.Fatal(err) |
| 155 | } |
| 156 | binding := Binding{Version: 1, Direction: DirectionResult, Account: "account", App: "home", Host: "test.example", RequestID: "request", AttemptID: "attempt", Recipient: fingerprint} |
| 157 | for _, n := range []int{0, 1, MaxResultBytes} { |
| 158 | body := bytes.Repeat([]byte{'r'}, n) |
| 159 | sealed, err := SealResult(key.PublicKey(), binding, body) |
| 160 | if err != nil { |
| 161 | t.Fatal(err) |
| 162 | } |
| 163 | got, err := OpenResult(key, binding, sealed) |
| 164 | if err != nil || !bytes.Equal(body, got) { |
| 165 | t.Fatalf("result roundtrip size%d: %v", n, err) |
| 166 | } |
| 167 | } |
| 168 | tooLarge := bytes.Repeat([]byte{'r'}, MaxResultBytes+1) |
| 169 | if _, err := SealResult(key.PublicKey(), binding, tooLarge); err != ErrResult { |
| 170 | t.Fatal("oversized seal accepted") |
| 171 | } |
| 172 | // Generic crypto accepts this size. Base64's rounding also fits the result |
| 173 | // encoded-length bound, so the separate decoded-length check must reject it. |
| 174 | sealed, err := Seal(key.PublicKey(), binding, tooLarge) |
| 175 | if err != nil { |
| 176 | t.Fatal(err) |
| 177 | } |
| 178 | if b, err := OpenResult(key, binding, sealed); b != nil || err != ErrResult { |
| 179 | t.Fatal("oversized decoded result accepted") |
| 180 | } |
| 181 | for _, direction := range []Direction{DirectionInput, DirectionEnvironment} { |
| 182 | wrong := binding |
| 183 | wrong.Direction = direction |
| 184 | if _, err := SealResult(key.PublicKey(), wrong, []byte("ok")); err != ErrResult { |
| 185 | t.Fatal("wrong seal purpose accepted") |
| 186 | } |
| 187 | sealed, err := Seal(key.PublicKey(), wrong, []byte("ok")) |
| 188 | if err != nil { |
| 189 | t.Fatal(err) |
| 190 | } |
| 191 | if b, err := OpenResult(key, wrong, sealed); b != nil || err != ErrResult { |
| 192 | t.Fatal("wrong open purpose accepted") |
| 193 | } |
| 194 | } |
| 195 | } |
| 196 | |
amadan