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https://github.com/trezor/trezor-firmware.git
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core/sd-protect: If writing to the SD card fails in request_sd_salt(), inform the user and allow them to retry or abort.
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parent
236b6334c6
commit
39b4376b65
@ -30,7 +30,7 @@ async def _wrong_card_dialog(ctx: Optional[wire.Context]) -> None:
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text.br_half()
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if SD_CARD_HOT_SWAPPABLE:
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text.normal("Please insert the", "correct SD card for", "this device.")
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btn_confirm = "Retry"
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btn_confirm = "Retry" # type: Optional[str]
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btn_cancel = "Abort"
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else:
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text.normal("Please unplug the", "device and insert the", "correct SD card.")
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@ -51,7 +51,7 @@ async def _insert_card_dialog(ctx: Optional[wire.Context]) -> None:
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text.br_half()
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if SD_CARD_HOT_SWAPPABLE:
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text.normal("Please insert your", "SD card.")
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btn_confirm = "Retry"
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btn_confirm = "Retry" # type: Optional[str]
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btn_cancel = "Abort"
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else:
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text.normal("Please unplug the", "device and insert your", "SD card.")
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@ -88,6 +88,27 @@ def _get_salt_path(new: bool = False) -> str:
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return "%s/salt" % _get_device_dir()
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def _load_salt(fs: io.FatFS, auth_key: bytes, path: str) -> Optional[bytearray]:
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# Load the salt file if it exists.
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try:
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with fs.open(path, "r") as f:
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salt = bytearray(SD_SALT_LEN_BYTES)
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stored_tag = bytearray(SD_SALT_AUTH_TAG_LEN_BYTES)
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f.read(salt)
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f.read(stored_tag)
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except OSError:
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return None
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# Check the salt's authentication tag.
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computed_tag = hmac.new(auth_key, salt, sha256).digest()[
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:SD_SALT_AUTH_TAG_LEN_BYTES
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]
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if not consteq(computed_tag, stored_tag):
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return None
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return salt
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async def request_sd_salt(
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ctx: Optional[wire.Context], salt_auth_key: bytes
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) -> bytearray:
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@ -102,56 +123,34 @@ async def request_sd_salt(
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try:
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fs.mount()
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# Load salt if it exists.
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salt = None # type: Optional[bytearray]
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try:
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with fs.open(salt_path, "r") as f:
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salt = bytearray(SD_SALT_LEN_BYTES)
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salt_tag = bytearray(SD_SALT_AUTH_TAG_LEN_BYTES)
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f.read(salt)
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f.read(salt_tag)
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except OSError:
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salt = None
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if salt is not None and consteq(
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hmac.new(salt_auth_key, salt, sha256).digest()[
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:SD_SALT_AUTH_TAG_LEN_BYTES
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],
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salt_tag,
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):
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salt = _load_salt(fs, salt_auth_key, salt_path)
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if salt is not None:
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return salt
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# Load salt.new if it exists.
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new_salt = None # type: Optional[bytearray]
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try:
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with fs.open(new_salt_path, "r") as f:
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new_salt = bytearray(SD_SALT_LEN_BYTES)
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new_salt_tag = bytearray(SD_SALT_AUTH_TAG_LEN_BYTES)
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f.read(new_salt)
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f.read(new_salt_tag)
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except OSError:
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new_salt = None
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if new_salt is not None and consteq(
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hmac.new(salt_auth_key, new_salt, sha256).digest()[
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:SD_SALT_AUTH_TAG_LEN_BYTES
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],
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new_salt_tag,
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):
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# Check if there is a new salt.
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salt = _load_salt(fs, salt_auth_key, new_salt_path)
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if salt is not None:
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# SD salt regeneration was interrupted earlier. Bring into consistent state.
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# TODO Possibly overwrite salt file with random data.
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try:
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fs.unlink(salt_path)
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except OSError:
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pass
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try:
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fs.rename(new_salt_path, salt_path)
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return new_salt
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except OSError:
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error_dialog = _write_failed_dialog(ctx)
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else:
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return salt
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else:
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# No valid salt file on this SD card.
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error_dialog = _wrong_card_dialog(ctx)
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finally:
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fs.unmount()
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sd.power(False)
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await _wrong_card_dialog(ctx)
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await error_dialog
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async def set_sd_salt(
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@ -195,7 +194,7 @@ async def commit_sd_salt(ctx: Optional[wire.Context]) -> None:
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sd = io.SDCard()
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fs = io.FatFS()
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if not sd.power(True):
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raise IOError
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raise OSError
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try:
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fs.mount()
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@ -216,7 +215,7 @@ async def remove_sd_salt(ctx: Optional[wire.Context]) -> None:
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sd = io.SDCard()
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fs = io.FatFS()
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if not sd.power(True):
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raise IOError
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raise OSError
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try:
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fs.mount()
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