# This file is part of the Trezor project. # # Copyright (C) 2012-2022 SatoshiLabs and contributors # # This library is free software: you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License version 3 # as published by the Free Software Foundation. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Lesser General Public License for more details. # # You should have received a copy of the License along with this library. # If not, see . import os import sys from typing import Any, Callable, Optional, Union import click from mnemonic import Mnemonic from typing_extensions import Protocol from . import device, messages from .client import MAX_PIN_LENGTH, PASSPHRASE_ON_DEVICE from .exceptions import Cancelled from .messages import PinMatrixRequestType, WordRequestType PIN_MATRIX_DESCRIPTION = """ Use the numeric keypad or lowercase letters to describe number positions. The layout is: 7 8 9 e r t 4 5 6 -or- d f g 1 2 3 c v b """.strip() RECOVERY_MATRIX_DESCRIPTION = """ Use the numeric keypad to describe positions. For the word list use only left and right keys. Use backspace to correct an entry. The keypad layout is: 7 8 9 7 | 9 4 5 6 4 | 6 1 2 3 1 | 3 """.strip() PIN_GENERIC = None PIN_CURRENT = PinMatrixRequestType.Current PIN_NEW = PinMatrixRequestType.NewFirst PIN_CONFIRM = PinMatrixRequestType.NewSecond WIPE_CODE_NEW = PinMatrixRequestType.WipeCodeFirst WIPE_CODE_CONFIRM = PinMatrixRequestType.WipeCodeSecond # Workaround for limitation of Git Bash # getpass function does not work correctly on Windows when not using a real terminal # (the hidden input is not allowed and it also freezes the script completely) # Details: https://bugs.python.org/issue44762 CAN_HANDLE_HIDDEN_INPUT = sys.stdin and sys.stdin.isatty() class TrezorClientUI(Protocol): def button_request(self, br: messages.ButtonRequest) -> None: ... def get_pin(self, code: Optional[PinMatrixRequestType]) -> str: ... def get_passphrase(self, available_on_device: bool) -> Union[str, object]: ... def echo(*args: Any, **kwargs: Any) -> None: return click.echo(*args, err=True, **kwargs) def prompt(text: str, *, hide_input: bool = False, **kwargs: Any) -> Any: # Disallowing hidden input and warning user when it would cause issues if not CAN_HANDLE_HIDDEN_INPUT and hide_input: hide_input = False text += " (WARNING: will be displayed!)" return click.prompt(text, hide_input=hide_input, err=True, **kwargs) class ClickUI: def __init__( self, always_prompt: bool = False, passphrase_on_host: bool = False ) -> None: self.pinmatrix_shown = False self.prompt_shown = False self.always_prompt = always_prompt self.passphrase_on_host = passphrase_on_host def button_request(self, _br: messages.ButtonRequest) -> None: if not self.prompt_shown: echo("Please confirm action on your Trezor device.") if not self.always_prompt: self.prompt_shown = True def get_pin(self, code: Optional[PinMatrixRequestType] = None) -> str: if code == PIN_CURRENT: desc = "current PIN" elif code == PIN_NEW: desc = "new PIN" elif code == PIN_CONFIRM: desc = "new PIN again" elif code == WIPE_CODE_NEW: desc = "new wipe code" elif code == WIPE_CODE_CONFIRM: desc = "new wipe code again" else: desc = "PIN" if not self.pinmatrix_shown: echo(PIN_MATRIX_DESCRIPTION) if not self.always_prompt: self.pinmatrix_shown = True while True: try: pin = prompt(f"Please enter {desc}", hide_input=True) except click.Abort: raise Cancelled from None # translate letters to numbers if letters were used if all(d in "cvbdfgert" for d in pin): pin = pin.translate(str.maketrans("cvbdfgert", "123456789")) if any(d not in "123456789" for d in pin): echo( "The value may only consist of digits 1 to 9 or letters cvbdfgert." ) elif len(pin) > MAX_PIN_LENGTH: echo(f"The value must be at most {MAX_PIN_LENGTH} digits in length.") else: return pin def get_passphrase(self, available_on_device: bool) -> Union[str, object]: if available_on_device and not self.passphrase_on_host: return PASSPHRASE_ON_DEVICE env_passphrase = os.getenv("PASSPHRASE") if env_passphrase is not None: echo("Passphrase required. Using PASSPHRASE environment variable.") return env_passphrase while True: try: passphrase = prompt( "Passphrase required", hide_input=True, default="", show_default=False, ) # In case user sees the input on the screen, we do not need confirmation if not CAN_HANDLE_HIDDEN_INPUT: return passphrase second = prompt( "Confirm your passphrase", hide_input=True, default="", show_default=False, ) if passphrase == second: return passphrase else: echo("Passphrase did not match. Please try again.") except click.Abort: raise Cancelled from None def mnemonic_words( expand: bool = False, language: str = "english" ) -> Callable[[WordRequestType], str]: if expand: wordlist = Mnemonic(language).wordlist else: wordlist = [] def expand_word(word: str) -> str: if not expand: return word if word in wordlist: return word matches = [w for w in wordlist if w.startswith(word)] if len(matches) == 1: return matches[0] echo("Choose one of: " + ", ".join(matches)) raise KeyError(word) def get_word(type: WordRequestType) -> str: assert type == WordRequestType.Plain while True: try: word = prompt("Enter one word of mnemonic") return expand_word(word) except KeyError: pass except click.Abort: raise Cancelled from None return get_word def matrix_words(type: WordRequestType) -> str: while True: try: ch = click.getchar() except (KeyboardInterrupt, EOFError): raise Cancelled from None if ch in "\x04\x1b": # Ctrl+D, Esc raise Cancelled if ch in "\x08\x7f": # Backspace, Del return device.RECOVERY_BACK if type == WordRequestType.Matrix6 and ch in "147369": return ch if type == WordRequestType.Matrix9 and ch in "123456789": return ch