| 1 | //go:build linux && rootrunner |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "encoding/json" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | "strings" |
| 10 | "testing" |
| 11 | |
| 12 | "github.com/carlosframework/platform/internal/release" |
| 13 | "github.com/carlosframework/platform/internal/rootstate" |
| 14 | "golang.org/x/sys/unix" |
| 15 | ) |
| 16 | |
| 17 | const generationDeviceRebootDir = "/var/lib/carlos-rootrunner-p3-devices" |
| 18 | |
| 19 | func TestRootRebootGenerationDevicesPhase1(t *testing.T) { |
| 20 | if os.Geteuid() != 0 { |
| 21 | t.Fatal("root required") |
| 22 | } |
| 23 | if err := os.Mkdir(generationDeviceRebootDir, 0755); err != nil { |
| 24 | t.Fatal(err) |
| 25 | } |
| 26 | tree := filepath.Join(generationDeviceRebootDir, "tree") |
| 27 | if err := os.Mkdir(tree, 0755); err != nil { |
| 28 | t.Fatal(err) |
| 29 | } |
| 30 | path := filepath.Join(tree, "app") |
| 31 | if err := os.WriteFile(path, []byte("retained executable"), 0700); err != nil { |
| 32 | t.Fatal(err) |
| 33 | } |
| 34 | f, err := rootstate.OpenTrustedFile(path) |
| 35 | if err != nil { |
| 36 | t.Fatal(err) |
| 37 | } |
| 38 | defer f.Close() |
| 39 | d, err := os.Open(tree) |
| 40 | if err != nil { |
| 41 | t.Fatal(err) |
| 42 | } |
| 43 | defer d.Close() |
| 44 | id, err := rootstate.Identity(f) |
| 45 | if err != nil { |
| 46 | t.Fatal(err) |
| 47 | } |
| 48 | tid, err := rootstate.Identity(d) |
| 49 | if err != nil { |
| 50 | t.Fatal(err) |
| 51 | } |
| 52 | persistent, err := rootstate.ObjectIdentity(f) |
| 53 | if err != nil { |
| 54 | t.Fatal(err) |
| 55 | } |
| 56 | tp, err := rootstate.ObjectIdentity(d) |
| 57 | if err != nil { |
| 58 | t.Fatal(err) |
| 59 | } |
| 60 | b := release.GenerationBinding{Path: path, Tree: tree, Executable: id, TreeIdentity: tid, ExecutableProof: persistent, TreeProof: tp} |
| 61 | s, err := rootstate.Open(filepath.Join(generationDeviceRebootDir, "authority"), true, false) |
| 62 | if err != nil { |
| 63 | t.Fatal(err) |
| 64 | } |
| 65 | defer s.Close() |
| 66 | raw, _ := json.Marshal(b) |
| 67 | if err = s.Write("binding.json", raw); err != nil { |
| 68 | t.Fatal(err) |
| 69 | } |
| 70 | t.Logf("boot=%s device=%d mount=%d", persistent.Boot, id.Device, persistent.Mount) |
| 71 | } |
| 72 | |
| 73 | func TestRootRebootGenerationDevicesPhase2(t *testing.T) { |
| 74 | defer os.RemoveAll(generationDeviceRebootDir) |
| 75 | s, err := rootstate.Open(filepath.Join(generationDeviceRebootDir, "authority"), false, false) |
| 76 | if err != nil { |
| 77 | t.Fatal(err) |
| 78 | } |
| 79 | defer s.Close() |
| 80 | raw, err := s.Read("binding.json") |
| 81 | if err != nil { |
| 82 | t.Fatal(err) |
| 83 | } |
| 84 | var b release.GenerationBinding |
| 85 | if err = json.Unmarshal(raw, &b); err != nil { |
| 86 | t.Fatal(err) |
| 87 | } |
| 88 | boot, err := os.ReadFile("/proc/sys/kernel/random/boot_id") |
| 89 | if err != nil || strings.TrimSpace(string(boot)) == b.ExecutableProof.Boot { |
| 90 | t.Fatal("actual reboot required", err) |
| 91 | } |
| 92 | current, err := generationCurrentFiles(b, rootstate.OpenTrustedFile) |
| 93 | if err != nil { |
| 94 | t.Fatal("retained identity across boot", err) |
| 95 | } |
| 96 | t.Logf("prior-device=%d current-device=%d", b.Executable.Device, current.Executable.Device) |
| 97 | // The reboot need not renumber this particular instance. Exercise that |
| 98 | // branch explicitly while retaining the actual previous boot's handles. |
| 99 | changed := b |
| 100 | changed.Executable.Device++ |
| 101 | changed.TreeIdentity.Device++ |
| 102 | changed.ExecutableProof.Device++ |
| 103 | changed.ExecutableProof.Mount++ |
| 104 | changed.TreeProof.Device++ |
| 105 | changed.TreeProof.Mount++ |
| 106 | if _, err = generationCurrentFiles(changed, rootstate.OpenTrustedFile); err != nil { |
| 107 | t.Fatal("boot-local numbers persisted as authority", err) |
| 108 | } |
| 109 | foreign := b |
| 110 | foreign.ExecutableProof.Filesystem = "different-filesystem" |
| 111 | if _, err = generationCurrentFiles(foreign, rootstate.OpenTrustedFile); err == nil { |
| 112 | t.Fatal("foreign filesystem accepted") |
| 113 | } |
| 114 | if err = unix.Mount(b.Tree, b.Tree, "", unix.MS_BIND, ""); err != nil { |
| 115 | t.Fatal(err) |
| 116 | } |
| 117 | if _, err = generationCurrentFiles(b, rootstate.OpenTrustedFile); err == nil { |
| 118 | t.Fatal("substituted mount accepted") |
| 119 | } |
| 120 | if err = unix.Unmount(b.Tree, 0); err != nil { |
| 121 | t.Fatal(err) |
| 122 | } |
| 123 | if err = os.Rename(b.Path, b.Path+"-old"); err != nil { |
| 124 | t.Fatal(err) |
| 125 | } |
| 126 | if err = os.WriteFile(b.Path, []byte("retained executable"), 0700); err != nil { |
| 127 | t.Fatal(err) |
| 128 | } |
| 129 | if _, err = generationCurrentFiles(b, rootstate.OpenTrustedFile); err == nil { |
| 130 | t.Fatal("substituted inode accepted") |
| 131 | } |
| 132 | } |
| 133 | |
amadan