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# Copyright 2022 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import logging
import os
import shutil
import tempfile
import vmdb
class CryptsetupPlugin(vmdb.Plugin):
def enable(self):
self.app.step_runners.add(CryptsetupStepRunner())
class CryptsetupStepRunner(vmdb.StepRunnerInterface):
def get_key_spec(self):
return {
"cryptsetup": str,
"name": str,
"password": "",
"key-file": "",
"key-cmd": "",
}
def run(self, step, settings, state):
underlying = step["cryptsetup"]
crypt_name = step["name"]
password = step["password"] or None
key_file = step["key-file"] or None
key_cmd = step["key-cmd"] or None
if not isinstance(underlying, str):
raise vmdb.NotString("cryptsetup", underlying)
if not isinstance(crypt_name, str):
raise vmdb.NotString("cryptsetup: tag", crypt_name)
if password is None and key_file is None and key_cmd is None:
raise Exception(
"cryptsetup step MUST define one of password, key-file, or key-cmd"
)
if password is not None and key_file is not None:
raise Exception(
"cryptsetup step MUST define only one of password or key-file"
)
if password is not None and key_cmd is not None:
raise Exception(
"cryptsetup step MUST define only one of password or key-cmd"
)
if key_file is not None and key_cmd is not None:
raise Exception(
"cryptsetup step MUST define only one of key_file or key-cmd"
)
state.tmp_key_file = None
rmtmp = False
if password is not None:
key_file = self._write_temp(password)
rmtmp = True
if key_cmd is not None:
output = vmdb.runcmd(["sh", "-ec", key_cmd])
output = output.decode("UTF-8")
key = output.splitlines()[0]
key_file = self._write_temp(key)
rmtmp = True
assert key_file is not None
dev = state.tags.get_dev(underlying)
if dev is None:
for t in state.tags.get_tags():
logging.debug(
"tag %r dev %r mp %r",
t,
state.tags.get_dev(t),
state.tags.get_builder_mount_point(t),
)
assert 0
vmdb.runcmd(
[
"cryptsetup",
"luksFormat",
"--batch-mode",
"--type=luks2",
"--pbkdf=argon2id",
dev,
key_file,
]
)
vmdb.runcmd(
[
"cryptsetup",
"open",
"--key-file",
key_file,
"--allow-discards",
dev,
crypt_name,
]
)
crypt_dev = "/dev/mapper/{}".format(crypt_name)
assert os.path.exists(crypt_dev)
uuid = vmdb.runcmd(["cryptsetup", "luksUUID", dev]).decode("UTF8").strip()
state.tags.append(crypt_name)
state.tags.set_dev(crypt_name, crypt_dev)
state.tags.set_luksuuid(crypt_name, uuid)
state.tags.set_dm(crypt_name, crypt_name)
vmdb.progress(
f"LUKS: name={crypt_name} dev={crypt_dev} luksuuid={uuid} dm={crypt_name}"
)
vmdb.progress(f"LUKS: {state.tags._tags}")
vmdb.progress("remembering LUKS device {} as {}".format(crypt_dev, crypt_name))
if rmtmp:
os.remove(key_file)
def _write_temp(self, password):
fd, filename = tempfile.mkstemp()
os.close(fd)
open(filename, "w").write(password)
return filename
def teardown(self, step, settings, state):
x = state.tmp_key_file
if x is not None and os.path.exists(x):
os.remove(x)
crypt_name = step["name"]
crypt_dev = "/dev/mapper/{}".format(crypt_name)
vmdb.runcmd(["cryptsetup", "close", crypt_dev])
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