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import os
from .exceptions import *
from .general import *
from .disk import Partition
from .output import log, LOG_LEVELS
from .storage import storage
class luks2():
def __init__(self, partition, mountpoint, password, *args, **kwargs):
self.password = password
self.partition = partition
self.mountpoint = mountpoint
self.args = args
self.kwargs = kwargs
self.filesystem = 'crypto_LUKS'
def __enter__(self):
key_file = self.encrypt(self.partition, self.password, *self.args, **self.kwargs)
return self.unlock(self.partition, self.mountpoint, key_file)
def __exit__(self, *args, **kwargs):
# TODO: https://stackoverflow.com/questions/28157929/how-to-safely-handle-an-exception-inside-a-context-manager
if len(args) >= 2 and args[1]:
raise args[1]
return True
def encrypt(self, partition, password, key_size=512, hash_type='sha512', iter_time=10000, key_file=None):
# TODO: We should be able to integrate this into the main log some how.
# Perhaps post-mortem?
log(f'Encrypting {partition} (This might take a while)', level=LOG_LEVELS.Info)
if not key_file:
key_file = f"/tmp/{os.path.basename(self.partition.path)}.disk_pw" # TODO: Make disk-pw-file randomly unique?
if type(password) != bytes: password = bytes(password, 'UTF-8')
with open(key_file, 'wb') as fh:
fh.write(password)
o = b''.join(sys_command(f'/usr/bin/cryptsetup -q -v --type luks2 --pbkdf argon2i --hash {hash_type} --key-size {key_size} --iter-time {iter_time} --key-file {os.path.abspath(key_file)} --use-urandom luksFormat {partition.path}'))
if b'Command successful.' not in o:
raise DiskError(f'Could not encrypt volume "{partition.path}": {o}')
return key_file
def unlock(self, partition, mountpoint, key_file):
"""
Mounts a lukts2 compatible partition to a certain mountpoint.
Keyfile must be specified as there's no way to interact with the pw-prompt atm.
:param mountpoint: The name without absolute path, for instance "luksdev" will point to /dev/mapper/luksdev
:type mountpoint: str
"""
if '/' in mountpoint:
os.path.basename(mountpoint) # TODO: Raise exception instead?
sys_command(f'/usr/bin/cryptsetup open {partition.path} {mountpoint} --key-file {os.path.abspath(key_file)} --type luks2')
if os.path.islink(f'/dev/mapper/{mountpoint}'):
return Partition(f'/dev/mapper/{mountpoint}', encrypted=True)
def close(self, mountpoint):
sys_command(f'cryptsetup close /dev/mapper/{mountpoint}')
return os.path.islink(f'/dev/mapper/{mountpoint}') is False
def format(self, path):
if (handle := sys_command(f"/usr/bin/cryptsetup -q -v luksErase {path}")).exit_code != 0:
raise DiskError(f'Could not format {path} with {self.filesystem} because: {b"".join(handle)}')
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