| 1 | //go:build linux && rootrunner |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "context" |
| 7 | "encoding/json" |
| 8 | "os" |
| 9 | "os/exec" |
| 10 | "path/filepath" |
| 11 | "syscall" |
| 12 | "testing" |
| 13 | |
| 14 | "github.com/carlosframework/platform/internal/hostguard" |
| 15 | "github.com/carlosframework/platform/internal/rootstate" |
| 16 | ) |
| 17 | |
| 18 | func TestPlan14UnitBindingRootRunner(t *testing.T) { |
| 19 | dir := generationRootRunnerDir(t) |
| 20 | b, in, shape := plan14UnitBindingFixture(t, "plan14-binding.service", "", "") |
| 21 | config := filepath.Join(dir, "units.json") |
| 22 | raw, _ := json.Marshal(struct { |
| 23 | Schema int |
| 24 | Units []claimUnitShape |
| 25 | }{1, []claimUnitShape{shape}}) |
| 26 | if err := os.WriteFile(config, raw, 0644); err != nil { |
| 27 | t.Fatal(err) |
| 28 | } |
| 29 | store, err := rootstate.Open(filepath.Join(dir, "bindings"), true, false) |
| 30 | if err != nil { |
| 31 | t.Fatal(err) |
| 32 | } |
| 33 | defer store.Close() |
| 34 | b.state = store |
| 35 | b.canonical = func(ctx context.Context, host string) (claimUnitShape, error) { |
| 36 | all, err := readClaimUnitShapes(config) |
| 37 | if err != nil { |
| 38 | return claimUnitShape{}, err |
| 39 | } |
| 40 | s, ok := all[host] |
| 41 | if !ok { |
| 42 | return s, os.ErrNotExist |
| 43 | } |
| 44 | return s, nil |
| 45 | } |
| 46 | bound, err := b.establish(t.Context(), in.Host) |
| 47 | if err != nil { |
| 48 | t.Fatal(err) |
| 49 | } |
| 50 | row := shape.route() |
| 51 | if _, err := b.check(t.Context(), in.Host, &row); err != nil { |
| 52 | t.Fatal(err) |
| 53 | } |
| 54 | child := exec.Command("/bin/sh", "-c", `printf '{}' > "$1"`, "binding-writer", config) |
| 55 | child.SysProcAttr = &syscall.SysProcAttr{Credential: &syscall.Credential{Uid: 65534, Gid: 65534}} |
| 56 | if err := child.Run(); err == nil { |
| 57 | t.Fatal("service credential replaced root config") |
| 58 | } |
| 59 | if _, err := b.check(t.Context(), in.Host, &row); err != nil { |
| 60 | t.Fatal("hostile writer changed binding", err) |
| 61 | } |
| 62 | if err := os.Chmod(config, 0666); err != nil { |
| 63 | t.Fatal(err) |
| 64 | } |
| 65 | if _, err := b.check(t.Context(), in.Host, &row); err == nil { |
| 66 | t.Fatal("service-writable canonical source accepted") |
| 67 | } |
| 68 | if err := os.Chmod(config, 0644); err != nil { |
| 69 | t.Fatal(err) |
| 70 | } |
| 71 | if err := os.Chown(config, 65534, 65534); err != nil { |
| 72 | t.Fatal(err) |
| 73 | } |
| 74 | if _, err := b.check(t.Context(), in.Host, &row); err == nil { |
| 75 | t.Fatal("service-owned canonical source accepted") |
| 76 | } |
| 77 | if err := os.Chown(config, 0, 0); err != nil { |
| 78 | t.Fatal(err) |
| 79 | } |
| 80 | successor := in |
| 81 | successor.Stamp++ |
| 82 | b.installation = func(context.Context, string) (hostguard.RootInstallation, error) { return successor, nil } |
| 83 | if _, err := b.check(t.Context(), in.Host, &row); err == nil { |
| 84 | t.Fatal("successor reused binding") |
| 85 | } |
| 86 | if err := b.retire(t.Context(), bound, func(claimUnitBinding) error { return nil }); err != nil { |
| 87 | t.Fatal(err) |
| 88 | } |
| 89 | if _, err := b.establish(t.Context(), in.Host); err == nil { |
| 90 | t.Fatal("retirement recreated authority") |
| 91 | } |
| 92 | } |
| 93 | |
amadan