| 1 | //go:build linux && rootrunner |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "crypto/sha256" |
| 8 | "encoding/hex" |
| 9 | "encoding/json" |
| 10 | "os" |
| 11 | "path/filepath" |
| 12 | "testing" |
| 13 | |
| 14 | "github.com/carlosframework/platform/internal/release" |
| 15 | "github.com/carlosframework/platform/internal/rootstate" |
| 16 | "golang.org/x/sys/unix" |
| 17 | ) |
| 18 | |
| 19 | const generationPinRebootRoot = "/var/lib/carlos-e53-pins" |
| 20 | |
| 21 | func TestRootRebootGenerationPinIdentityPhase1(t *testing.T) { |
| 22 | if os.Geteuid() != 0 { |
| 23 | t.Fatal("requires root") |
| 24 | } |
| 25 | if err := os.Mkdir(generationPinRebootRoot, 0700); err != nil { |
| 26 | t.Fatal(err) |
| 27 | } |
| 28 | path := release.VersionPath(filepath.Join(generationPinRebootRoot, "opt"), "bab", "v1", "app") |
| 29 | tree := filepath.Dir(path) |
| 30 | if err := os.MkdirAll(tree, 0755); err != nil { |
| 31 | t.Fatal(err) |
| 32 | } |
| 33 | if err := os.WriteFile(path, []byte("app"), 0755); err != nil { |
| 34 | t.Fatal(err) |
| 35 | } |
| 36 | capture := func(path string, dir bool) rootstate.FileIdentity { |
| 37 | var f *os.File |
| 38 | var err error |
| 39 | if dir { |
| 40 | f, err = rootstate.OpenAuthorityDirectory(path) |
| 41 | } else { |
| 42 | f, err = rootstate.OpenAuthorityFile(path) |
| 43 | } |
| 44 | if err != nil { |
| 45 | t.Fatal(err) |
| 46 | } |
| 47 | defer f.Close() |
| 48 | id, err := rootstate.PersistentIdentity(f) |
| 49 | if err != nil { |
| 50 | t.Fatal(err) |
| 51 | } |
| 52 | return id |
| 53 | } |
| 54 | exe, parent := capture(path, false), capture(tree, true) |
| 55 | // Force boot-local renumbering even when this runner reuses device numbers. |
| 56 | exe.Device, parent.Device = exe.Device^0x100000, parent.Device^0x100000 |
| 57 | exe.Mount, parent.Mount = exe.Mount+1000, parent.Mount+1000 |
| 58 | digest := sha256.Sum256([]byte("app")) |
| 59 | b := release.GenerationBinding{Binding: release.HistoryBinding{Host: "inventory.example", Account: "bab", App: "app"}, Installation: "installation", Record: "record", RecordETag: "etag", Attempt: "main", Inputs: "inputs", Invocation: "invocation", ControllerPID: os.Getpid(), ControllerStart: "fixture", Version: "v1", Digest: hex.EncodeToString(digest[:]), Path: path, Tree: tree, Executable: rootstate.FileIdentity{Device: exe.Device, Inode: exe.Inode}, TreeIdentity: rootstate.FileIdentity{Device: parent.Device, Inode: parent.Inode}, ExecutableProof: exe, TreeProof: parent, Target: release.GenerationOwner{Host: "inventory.example", Incarnation: "inc", Stamp: 1, Session: 1, Box: "box", Enrollment: "enrollment", BootID: exe.Boot, ControllerID: "fixture"}} |
| 60 | state, err := rootstate.Open(filepath.Join(generationPinRebootRoot, "generations"), true, false) |
| 61 | if err != nil { |
| 62 | t.Fatal(err) |
| 63 | } |
| 64 | defer state.Close() |
| 65 | if _, err := (&release.RootGenerations{Store: state}).Reserve(b); err != nil { |
| 66 | t.Fatal(err) |
| 67 | } |
| 68 | raw, err := json.Marshal(b) |
| 69 | if err != nil { |
| 70 | t.Fatal(err) |
| 71 | } |
| 72 | if err := writeFileDurable(filepath.Join(generationPinRebootRoot, "binding.json"), raw, 0600); err != nil { |
| 73 | t.Fatal(err) |
| 74 | } |
| 75 | t.Logf("generation saved boot=%s device=%d mount=%d", exe.Boot, exe.Device, exe.Mount) |
| 76 | } |
| 77 | |
| 78 | func TestRootRebootGenerationPinIdentityPhase2(t *testing.T) { |
| 79 | if os.Geteuid() != 0 { |
| 80 | t.Fatal("requires root") |
| 81 | } |
| 82 | defer os.RemoveAll(generationPinRebootRoot) |
| 83 | raw, err := os.ReadFile(filepath.Join(generationPinRebootRoot, "binding.json")) |
| 84 | var b release.GenerationBinding |
| 85 | if err != nil || json.Unmarshal(raw, &b) != nil { |
| 86 | t.Fatal("binding", err) |
| 87 | } |
| 88 | current, err := claimUnitBoot() |
| 89 | if err != nil || current == b.Target.BootID { |
| 90 | t.Fatal("requires actual reboot", err) |
| 91 | } |
| 92 | state, err := rootstate.Open(filepath.Join(generationPinRebootRoot, "generations"), false, false) |
| 93 | if err != nil { |
| 94 | t.Fatal(err) |
| 95 | } |
| 96 | defer state.Close() |
| 97 | ledger := &release.RootGenerations{Store: state} |
| 98 | // Completeness is supplied; persisted file and directory pin checks are real. |
| 99 | source := release.RootGenerationPins{Ledger: ledger, Verify: func(context.Context, []release.GenerationReservation) error { return nil }} |
| 100 | check := func() error { |
| 101 | pins, err := source.StagedPins(t.Context(), filepath.Join(generationPinRebootRoot, "opt")) |
| 102 | if err != nil { |
| 103 | return err |
| 104 | } |
| 105 | held, err := pins.Refers(b.Path) |
| 106 | if err != nil { |
| 107 | return err |
| 108 | } |
| 109 | if !held { |
| 110 | return os.ErrPermission |
| 111 | } |
| 112 | return nil |
| 113 | } |
| 114 | if err := check(); err != nil { |
| 115 | t.Fatal("cross-boot staged pin", err) |
| 116 | } |
| 117 | if err := unix.Mount(b.Tree, b.Tree, "", unix.MS_BIND, ""); err != nil { |
| 118 | t.Fatal(err) |
| 119 | } |
| 120 | if err := check(); err == nil { |
| 121 | t.Error("staged pin accepted substituted mount") |
| 122 | } |
| 123 | if err := unix.Unmount(b.Tree, 0); err != nil { |
| 124 | t.Fatal(err) |
| 125 | } |
| 126 | if err := os.Rename(b.Path, b.Path+".saved"); err != nil { |
| 127 | t.Fatal(err) |
| 128 | } |
| 129 | if err := os.WriteFile(b.Path, []byte("replacement"), 0755); err != nil { |
| 130 | t.Fatal(err) |
| 131 | } |
| 132 | if err := check(); err == nil { |
| 133 | t.Error("staged pin accepted replacement") |
| 134 | } |
| 135 | if err := os.Remove(b.Path); err != nil { |
| 136 | t.Fatal(err) |
| 137 | } |
| 138 | if err := os.Rename(b.Path+".saved", b.Path); err != nil { |
| 139 | t.Fatal(err) |
| 140 | } |
| 141 | if err := os.Chown(filepath.Join(generationPinRebootRoot, "opt"), 65534, 65534); err != nil { |
| 142 | t.Fatal(err) |
| 143 | } |
| 144 | if err := check(); err == nil { |
| 145 | t.Error("staged pin accepted untrusted ancestry") |
| 146 | } |
| 147 | if err := os.Chown(filepath.Join(generationPinRebootRoot, "opt"), 0, 0); err != nil { |
| 148 | t.Fatal(err) |
| 149 | } |
| 150 | if err := check(); err != nil { |
| 151 | t.Fatal("restored staged pin", err) |
| 152 | } |
| 153 | saved, err := ledger.Read(b) |
| 154 | if err != nil || saved.Binding != b { |
| 155 | t.Fatal("rewrote old generation identity", err) |
| 156 | } |
| 157 | t.Logf("staged pin retained across boot %s -> %s", b.Target.BootID, current) |
| 158 | } |
| 159 | |
amadan