| 1 | //go:build linux |
| 2 | |
| 3 | package sandbox |
| 4 | |
| 5 | import ( |
| 6 | "os" |
| 7 | "path/filepath" |
| 8 | "reflect" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | func TestLinuxWriteDirsSkipsMissingDirs(t *testing.T) { |
| 13 | home := t.TempDir() |
| 14 | t.Setenv("HOME", home) |
| 15 | if err := os.Mkdir(filepath.Join(home, ".cache"), 0o755); err != nil { |
| 16 | t.Fatal(err) |
| 17 | } |
| 18 | |
| 19 | got := linuxWriteDirs() |
| 20 | if !containsPath(got, filepath.Join(home, ".cache")) { |
| 21 | t.Fatalf("existing cache dir missing from linux write dirs: %v", got) |
| 22 | } |
| 23 | for _, missing := range []string{".cargo", ".npm", "go"} { |
| 24 | if containsPath(got, filepath.Join(home, missing)) { |
| 25 | t.Fatalf("missing dir %s should not be bound: %v", missing, got) |
| 26 | } |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | func TestBwrapExecutableMountArgsRevealsOnlyExactTemporaryExecutable(t *testing.T) { |
| 31 | got := bwrapExecutableMountArgs([]string{"/tmp/go-build123/b456/plugin.test", "-test.run=Helper"}) |
| 32 | want := []string{ |
| 33 | "--dir", "/tmp/go-build123", |
| 34 | "--dir", "/tmp/go-build123/b456", |
| 35 | "--ro-bind", "/tmp/go-build123/b456/plugin.test", "/tmp/go-build123/b456/plugin.test", |
| 36 | } |
| 37 | if !reflect.DeepEqual(got, want) { |
| 38 | t.Fatalf("temporary executable mount args = %v, want %v", got, want) |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | func TestBwrapExecutableMountArgsLeavesVisibleExecutableAlone(t *testing.T) { |
| 43 | if got := bwrapExecutableMountArgs([]string{"/usr/bin/node", "server.js"}); got != nil { |
| 44 | t.Fatalf("visible executable mount args = %v, want nil", got) |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | func TestBwrapArgsForArgsMountsTemporaryExecutableAfterMasks(t *testing.T) { |
| 49 | secretDir := t.TempDir() |
| 50 | argv := bwrapArgsForArgs(Spec{ |
| 51 | ForbidReadRoots: []string{secretDir}, |
| 52 | }, []string{"/tmp/go-build123/b456/plugin.test", "-test.run=Helper"}) |
| 53 | mask := indexArgs(argv, "--tmpfs", secretDir) |
| 54 | mount := indexArgs(argv, "--ro-bind", "/tmp/go-build123/b456/plugin.test", "/tmp/go-build123/b456/plugin.test") |
| 55 | if mask < 0 || mount < 0 || mount < mask { |
| 56 | t.Fatalf("temporary executable must be mounted after masks: %v", argv) |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | func TestBwrapArgsBindsSessionTempAtTmp(t *testing.T) { |
| 61 | private := t.TempDir() |
| 62 | argv := bwrapArgs(Spec{ |
| 63 | Mode: "enforce", |
| 64 | SessionTemp: private, |
| 65 | WriteRoots: []string{t.TempDir()}, |
| 66 | }, Shell{Kind: ShellBash, Path: "bash"}, "true") |
| 67 | bind := indexArgs(argv, "--bind", private, "/tmp") |
| 68 | if bind < 0 { |
| 69 | t.Fatalf("expected --bind %s /tmp in %v", private, argv) |
| 70 | } |
| 71 | if indexArgs(argv, "--tmpfs", "/tmp") >= 0 { |
| 72 | t.Fatalf("session temp must not use tmpfs /tmp: %v", argv) |
| 73 | } |
| 74 | // Must not bind the host public temporary root as /tmp. |
| 75 | if host := os.TempDir(); host != private { |
| 76 | if indexArgs(argv, "--bind", host, "/tmp") >= 0 { |
| 77 | t.Fatalf("must not bind host temp %s at /tmp: %v", host, argv) |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | func TestBwrapArgsWithoutSessionTempKeepsTmpfs(t *testing.T) { |
| 83 | argv := bwrapArgs(Spec{Mode: "enforce"}, Shell{Kind: ShellBash, Path: "bash"}, "true") |
| 84 | if indexArgs(argv, "--tmpfs", "/tmp") < 0 { |
| 85 | t.Fatalf("independent sandbox should keep tmpfs /tmp: %v", argv) |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | func TestBwrapForbidReadArgsMasksFilesAndDirectories(t *testing.T) { |
| 90 | dir := t.TempDir() |
| 91 | nested := filepath.Join(dir, "nested") |
| 92 | if err := os.Mkdir(nested, 0o700); err != nil { |
| 93 | t.Fatal(err) |
| 94 | } |
| 95 | file := filepath.Join(t.TempDir(), "credentials.env") |
| 96 | if err := os.WriteFile(file, []byte("secret"), 0o600); err != nil { |
| 97 | t.Fatal(err) |
| 98 | } |
| 99 | missing := filepath.Join(dir, "missing") |
| 100 | |
| 101 | got := bwrapForbidReadArgs([]string{dir, nested, file, file, missing}) |
| 102 | want := []string{ |
| 103 | "--tmpfs", dir, |
| 104 | "--ro-bind", "/dev/null", file, |
| 105 | } |
| 106 | if !reflect.DeepEqual(got, want) { |
| 107 | t.Fatalf("forbid-read mount args = %v, want %v", got, want) |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | func indexArgs(args []string, want ...string) int { |
| 112 | for i := 0; i+len(want) <= len(args); i++ { |
| 113 | if reflect.DeepEqual(args[i:i+len(want)], want) { |
| 114 | return i |
| 115 | } |
| 116 | } |
| 117 | return -1 |
| 118 | } |
| 119 | |
| 120 | func containsPath(paths []string, want string) bool { |
| 121 | absWant, err := filepath.Abs(want) |
| 122 | if err != nil { |
| 123 | return false |
| 124 | } |
| 125 | for _, p := range paths { |
| 126 | if p == absWant { |
| 127 | return true |
| 128 | } |
| 129 | } |
| 130 | return false |
| 131 | } |
| 132 |