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from __future__ import annotations
import getpass
from pathlib import Path
from typing import List, Optional
from .device_model import PartitionModification, Fido2Device
from ..general import SysCommand, SysCommandWorker, clear_vt100_escape_codes
from ..output import error, info
from ..exceptions import SysCallError
class Fido2:
_loaded: bool = False
_fido2_devices: List[Fido2Device] = []
@classmethod
def get_fido2_devices(cls, reload: bool = False) -> List[Fido2Device]:
"""
Uses systemd-cryptenroll to list the FIDO2 devices
connected that supports FIDO2.
Some devices might show up in udevadm as FIDO2 compliant
when they are in fact not.
The drawback of systemd-cryptenroll is that it uses human readable format.
That means we get this weird table like structure that is of no use.
So we'll look for `MANUFACTURER` and `PRODUCT`, we take their index
and we split each line based on those positions.
Output example:
PATH MANUFACTURER PRODUCT
/dev/hidraw1 Yubico YubiKey OTP+FIDO+CCID
"""
# to prevent continuous reloading which will slow
# down moving the cursor in the menu
if not cls._loaded or reload:
try:
ret: Optional[str] = SysCommand("systemd-cryptenroll --fido2-device=list").decode('UTF-8')
except SysCallError:
error('fido2 support is most likely not installed')
raise ValueError('HSM devices can not be detected, is libfido2 installed?')
if not ret:
return []
fido_devices: str = clear_vt100_escape_codes(ret) # type: ignore
manufacturer_pos = 0
product_pos = 0
devices = []
for line in fido_devices.split('\r\n'):
if '/dev' not in line:
manufacturer_pos = line.find('MANUFACTURER')
product_pos = line.find('PRODUCT')
continue
path = line[:manufacturer_pos].rstrip()
manufacturer = line[manufacturer_pos:product_pos].rstrip()
product = line[product_pos:]
devices.append(
Fido2Device(Path(path), manufacturer, product)
)
cls._loaded = True
cls._fido2_devices = devices
return cls._fido2_devices
@classmethod
def fido2_enroll(
cls,
hsm_device: Fido2Device,
part_mod: PartitionModification,
password: str
):
worker = SysCommandWorker(f"systemd-cryptenroll --fido2-device={hsm_device.path} {part_mod.dev_path}", peek_output=True)
pw_inputted = False
pin_inputted = False
while worker.is_alive():
if pw_inputted is False:
if bytes(f"please enter current passphrase for disk {part_mod.dev_path}", 'UTF-8') in worker._trace_log.lower():
worker.write(bytes(password, 'UTF-8'))
pw_inputted = True
elif pin_inputted is False:
if bytes(f"please enter security token pin", 'UTF-8') in worker._trace_log.lower():
worker.write(bytes(getpass.getpass(" "), 'UTF-8'))
pin_inputted = True
info('You might need to touch the FIDO2 device to unlock it if no prompt comes up after 3 seconds')
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