Handle writes back the version and NoAuth
(reader io.Reader, writer io.Writer)
| 38 | |
| 39 | // Handle writes back the version and NoAuth |
| 40 | func (a *UserPassAuthAuthenticator) Handle(reader io.Reader, writer io.Writer) error { |
| 41 | if _, err := writer.Write([]byte{socks5Version, UserPassAuth}); err != nil { |
| 42 | return err |
| 43 | } |
| 44 | |
| 45 | // Get the version and username length |
| 46 | header := []byte{0, 0} |
| 47 | if _, err := io.ReadAtLeast(reader, header, 2); err != nil { |
| 48 | return err |
| 49 | } |
| 50 | |
| 51 | // Ensure compatibility. Someone call E-harmony |
| 52 | if header[0] != userAuthVersion { |
| 53 | return fmt.Errorf("Unsupported auth version: %v", header[0]) |
| 54 | } |
| 55 | |
| 56 | // Get the user name |
| 57 | userLen := int(header[1]) |
| 58 | user := make([]byte, userLen) |
| 59 | if _, err := io.ReadAtLeast(reader, user, userLen); err != nil { |
| 60 | return err |
| 61 | } |
| 62 | |
| 63 | // Get the password length |
| 64 | if _, err := reader.Read(header[:1]); err != nil { |
| 65 | return err |
| 66 | } |
| 67 | |
| 68 | // Get the password |
| 69 | passLen := int(header[0]) |
| 70 | pass := make([]byte, passLen) |
| 71 | if _, err := io.ReadAtLeast(reader, pass, passLen); err != nil { |
| 72 | return err |
| 73 | } |
| 74 | |
| 75 | // Verify the password |
| 76 | if a.IsValid(string(user), string(pass)) { |
| 77 | _, err := writer.Write([]byte{userAuthVersion, authSuccess}) |
| 78 | return err |
| 79 | } |
| 80 | |
| 81 | // password failed. Write back failure |
| 82 | if _, err := writer.Write([]byte{userAuthVersion, authFailure}); err != nil { |
| 83 | return err |
| 84 | } |
| 85 | |
| 86 | return fmt.Errorf("User authentication failed") |
| 87 | } |