| 1 | //go:build linux |
| 2 | |
| 3 | package host |
| 4 | |
| 5 | import ( |
| 6 | "os" |
| 7 | "path/filepath" |
| 8 | "syscall" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | // A umask 077 operator shell must not leave the guard directories closed to |
| 13 | // the non-root units that exec the guard binary through them. |
| 14 | func TestMkdirAllExactIgnoresUmask(t *testing.T) { |
| 15 | old := syscall.Umask(0o077) |
| 16 | defer syscall.Umask(old) |
| 17 | root := t.TempDir() |
| 18 | if err := os.Chmod(root, 0o700); err != nil { |
| 19 | t.Fatal(err) |
| 20 | } |
| 21 | dir := filepath.Join(root, "system", "guard", "identities") |
| 22 | if err := mkdirAllExact(dir, 0o755); err != nil { |
| 23 | t.Fatal(err) |
| 24 | } |
| 25 | for _, p := range []string{filepath.Join(root, "system"), filepath.Join(root, "system", "guard"), dir} { |
| 26 | st, err := os.Stat(p) |
| 27 | if err != nil { |
| 28 | t.Fatal(err) |
| 29 | } |
| 30 | if st.Mode().Perm() != 0o755 { |
| 31 | t.Fatalf("%s is %o, want 755", p, st.Mode().Perm()) |
| 32 | } |
| 33 | } |
| 34 | if st, _ := os.Stat(root); st.Mode().Perm() != 0o700 { |
| 35 | t.Fatalf("an existing parent's mode changed: %o", st.Mode().Perm()) |
| 36 | } |
| 37 | // A directory left 0700 by an earlier run is repaired. |
| 38 | if err := os.Chmod(dir, 0o700); err != nil { |
| 39 | t.Fatal(err) |
| 40 | } |
| 41 | if err := mkdirAllExact(dir, 0o755); err != nil { |
| 42 | t.Fatal(err) |
| 43 | } |
| 44 | if st, _ := os.Stat(dir); st.Mode().Perm() != 0o755 { |
| 45 | t.Fatalf("existing dir not repaired: %o", st.Mode().Perm()) |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | // guard-arm makes its lock directory before the guard directories, under the |
| 50 | // same <opt>/system parent: neither step may leave that parent closed, and a |
| 51 | // parent an earlier run left 0700 is repaired. |
| 52 | func TestGuardArmDirsIgnoreUmaskInOrder(t *testing.T) { |
| 53 | old := syscall.Umask(0o077) |
| 54 | defer syscall.Umask(old) |
| 55 | for _, preexisting := range []bool{false, true} { |
| 56 | opt := t.TempDir() |
| 57 | if preexisting { |
| 58 | if err := os.MkdirAll(filepath.Join(opt, "system"), 0o700); err != nil { |
| 59 | t.Fatal(err) |
| 60 | } |
| 61 | } |
| 62 | if err := prepareGuardArmLockDir(opt, systemRootDir(opt)); err != nil { |
| 63 | t.Fatal(err) |
| 64 | } |
| 65 | guard := systemGuardDir(opt) |
| 66 | for _, dir := range []string{guard, filepath.Join(guard, "identities")} { |
| 67 | if err := mkdirAllExact(dir, 0o755); err != nil { |
| 68 | t.Fatal(err) |
| 69 | } |
| 70 | } |
| 71 | for _, p := range []string{filepath.Join(opt, "system"), systemRootDir(opt), guard, filepath.Join(guard, "identities")} { |
| 72 | st, err := os.Stat(p) |
| 73 | if err != nil { |
| 74 | t.Fatal(err) |
| 75 | } |
| 76 | if st.Mode().Perm() != 0o755 { |
| 77 | t.Fatalf("preexisting=%v: %s is %o, want 755", preexisting, p, st.Mode().Perm()) |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | |
amadan