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| 1 | package rootstate |
| 2 | |
| 3 | import ( |
| 4 | "os" |
| 5 | "path/filepath" |
| 6 | |
| 7 | "github.com/carlosframework/platform/internal/safefile" |
| 8 | "golang.org/x/sys/unix" |
| 9 | ) |
| 10 | |
| 11 | func OpenTrustedFile(path string) (*os.File, error) { |
| 12 | if !filepath.IsAbs(path) || filepath.Clean(path) != path || path == "/" { |
| 13 | return nil, os.ErrPermission |
| 14 | } |
| 15 | s, err := Open(filepath.Dir(path), false, true) |
| 16 | if err != nil { |
| 17 | return nil, err |
| 18 | } |
| 19 | defer s.Close() |
| 20 | d := s.(*directory) |
| 21 | f, err := safefile.OpenFileAt(int(d.file.Fd()), filepath.Base(path), os.O_RDONLY, 0) |
| 22 | if err != nil { |
| 23 | return nil, err |
| 24 | } |
| 25 | if err := trusted(int(f.Fd()), 0, unix.S_IFREG); err != nil { |
| 26 | f.Close() |
| 27 | return nil, err |
| 28 | } |
| 29 | return f, nil |
| 30 | } |
| 31 | |
| 32 | func Identity(f *os.File) (FileIdentity, error) { |
| 33 | var st unix.Stat_t |
| 34 | if err := unix.Fstat(int(f.Fd()), &st); err != nil { |
| 35 | return FileIdentity{}, err |
| 36 | } |
| 37 | return FileIdentity{Device: uint64(st.Dev), Inode: st.Ino}, nil |
| 38 | } |
| 39 | |
| 40 | func CheckPublicConfig(f *os.File) error { |
| 41 | var st unix.Stat_t |
| 42 | if err := unix.Fstat(int(f.Fd()), &st); err != nil { |
| 43 | return err |
| 44 | } |
| 45 | if st.Uid != 0 || st.Gid != 0 || st.Mode&07777 != 0644 || st.Mode&unix.S_IFMT != unix.S_IFREG || st.Nlink != 1 { |
| 46 | return os.ErrPermission |
| 47 | } |
| 48 | return nil |
| 49 | } |
| 50 | |
amadan