| 1 | package rootstate |
| 2 | |
| 3 | import ( |
| 4 | "os" |
| 5 | "path/filepath" |
| 6 | "testing" |
| 7 | ) |
| 8 | |
| 9 | func TestTemplateUnitLinkRead(t *testing.T) { |
| 10 | parent := t.TempDir() |
| 11 | if err := os.Chmod(parent, 0755); err != nil { |
| 12 | t.Fatal(err) |
| 13 | } |
| 14 | name := "sshd@.service.wants" |
| 15 | if err := os.Mkdir(filepath.Join(parent, name), 0755); err != nil { |
| 16 | t.Fatal(err) |
| 17 | } |
| 18 | if err := os.Symlink("/usr/lib/systemd/system/getty@.service", filepath.Join(parent, name, "getty@tty1.service")); err != nil { |
| 19 | t.Fatal(err) |
| 20 | } |
| 21 | fd, err := os.Open(parent) |
| 22 | if err != nil { |
| 23 | t.Fatal(err) |
| 24 | } |
| 25 | defer fd.Close() |
| 26 | s, err := descend(fd, []string{name}, false, true, uint32(os.Geteuid())) |
| 27 | if err != nil { |
| 28 | t.Fatal("trusted public template directory", err) |
| 29 | } |
| 30 | defer s.Close() |
| 31 | target, err := s.(*directory).readLink("getty@tty1.service") |
| 32 | if err != nil || target != "/usr/lib/systemd/system/getty@.service" { |
| 33 | t.Fatal("template link", target, err) |
| 34 | } |
| 35 | if err = s.Write("new@record", []byte("authority")); err == nil { |
| 36 | t.Fatal("template exception admitted record write") |
| 37 | } |
| 38 | for _, parts := range [][]string{{".."}, {"../sshd@.service.wants"}, {"sshd@.service.wants/.."}} { |
| 39 | if d, e := descend(fd, parts, false, true, uint32(os.Geteuid())); e == nil { |
| 40 | d.Close() |
| 41 | t.Fatal("traversal accepted", parts) |
| 42 | } |
| 43 | } |
| 44 | if d, e := descend(fd, []string{"new@directory"}, true, true, uint32(os.Geteuid())); e == nil { |
| 45 | d.Close() |
| 46 | t.Fatal("template exception admitted directory creation") |
| 47 | } |
| 48 | if err = os.Chmod(filepath.Join(parent, name), 0777); err != nil { |
| 49 | t.Fatal(err) |
| 50 | } |
| 51 | if d, e := descend(fd, []string{name}, false, true, uint32(os.Geteuid())); e == nil { |
| 52 | d.Close() |
| 53 | t.Fatal("writable template directory accepted") |
| 54 | } |
| 55 | } |
| 56 | |
amadan