| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "golang.org/x/sys/unix" |
| 5 | "os" |
| 6 | "path/filepath" |
| 7 | "testing" |
| 8 | |
| 9 | "github.com/carlosframework/platform/internal/rootstate" |
| 10 | ) |
| 11 | |
| 12 | func TestPlan14ProofBindingProvenance(t *testing.T) { |
| 13 | if !plan14RootFixture(t) { |
| 14 | return |
| 15 | } |
| 16 | for _, attack := range []string{"nonroot owner", "writable parent", "writable file", "symlink", "rename", "erasure"} { |
| 17 | t.Run(attack, func(t *testing.T) { |
| 18 | e, rt, _, source := plan14ProofFixture(t) |
| 19 | path := source.sys.(*fakeUnits).shows[0].FragmentPath |
| 20 | makeProofAncestorsPublic(t, path) |
| 21 | makeProofAncestorsPublic(t, source.sys.(*fakeUnits).exe[7]) |
| 22 | source.openFile = rootstate.OpenTrustedFile |
| 23 | baseline, err := source.resolve(t.Context(), rt) |
| 24 | if err != nil { |
| 25 | t.Fatalf("trusted baseline: %v", err) |
| 26 | } |
| 27 | switch attack { |
| 28 | case "nonroot owner": |
| 29 | if err := unix.Mount("/foreign", path, "", unix.MS_BIND, ""); err != nil { |
| 30 | t.Fatal(err) |
| 31 | } |
| 32 | t.Cleanup(func() { _ = unix.Unmount(path, 0) }) |
| 33 | case "writable parent": |
| 34 | if err := os.Chmod(filepath.Dir(path), 0777); err != nil { |
| 35 | t.Fatal(err) |
| 36 | } |
| 37 | case "writable file": |
| 38 | if err := os.Chmod(path, 0666); err != nil { |
| 39 | t.Fatal(err) |
| 40 | } |
| 41 | case "symlink": |
| 42 | if err := os.Rename(path, path+".real"); err != nil { |
| 43 | t.Fatal(err) |
| 44 | } |
| 45 | if err := os.Symlink(path+".real", path); err != nil { |
| 46 | t.Fatal(err) |
| 47 | } |
| 48 | case "erasure": |
| 49 | if err := os.Remove(path); err != nil { |
| 50 | t.Fatal(err) |
| 51 | } |
| 52 | case "rename": |
| 53 | raw, err := os.ReadFile(path) |
| 54 | if err != nil { |
| 55 | t.Fatal(err) |
| 56 | } |
| 57 | if err := os.Rename(path, path+".old"); err != nil { |
| 58 | t.Fatal(err) |
| 59 | } |
| 60 | if err := os.WriteFile(path, raw, 0644); err != nil { |
| 61 | t.Fatal(err) |
| 62 | } |
| 63 | } |
| 64 | if attack == "rename" { |
| 65 | current, err := source.resolve(t.Context(), rt) |
| 66 | if err != nil { |
| 67 | t.Fatal(err) |
| 68 | } |
| 69 | if current.Source == baseline.Source { |
| 70 | t.Fatal("replacement retained identity") |
| 71 | } |
| 72 | if _, err := source.prepareRollback(t.Context(), baseline); err == nil { |
| 73 | t.Fatal("replacement accepted captured identity") |
| 74 | } |
| 75 | } else if _, err := source.resolve(t.Context(), rt); err == nil { |
| 76 | t.Fatal("mutation accepted") |
| 77 | } |
| 78 | _ = e |
| 79 | }) |
| 80 | } |
| 81 | } |
| 82 | |
amadan