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# Copyright (C) 2017 Jan Jancar
#
# This file is a part of the Mailman PGP plugin.
#
# 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/>.
"""List key generator runs in a separate process to not block for the
potentially long key generation operation."""
import multiprocessing as mp
from flufl.lock import Lock
from pgpy import PGPKey, PGPUID
from pgpy.constants import (
CompressionAlgorithm, HashAlgorithm, KeyFlags, SymmetricKeyAlgorithm)
from mailman_pgp.config import config
from mailman_pgp.utils.pgp import key_from_file
class ListKeyGenerator(mp.Process):
"""A multiprocessing list key generator."""
def __init__(self, pgp_list):
super().__init__(
target=self._run,
args=(config.pgp.primary_key_args, config.pgp.sub_key_args,
pgp_list.mlist.display_name,
pgp_list.mlist.posting_address,
pgp_list.mlist.request_address,
pgp_list.key_path),
daemon=True)
self._pgp_list = pgp_list
def generate(self, block=False):
self.start()
if block:
self.join()
return key_from_file(self._pgp_list.key_path)
def _run(self, primary_args, subkey_args, display_name, posting_address,
request_address, key_path):
"""
Generate the list keypair and save it.
:param primary_args:
:param subkey_args:
:param display_name:
:param posting_address:
:param request_address:
:param key_path:
"""
self.key = self._create(primary_args, subkey_args, display_name,
posting_address,
request_address)
with Lock(key_path + '.lock'):
self._save(self.key, key_path)
def _create(self, primary_args, subkey_args, display_name, posting_address,
request_address):
"""
Generate the list `PGPKey` keypair, with posting and request UIDs.
Use a Sign+Certify main key and Encrypt subkey.
:param primary_args:
:param subkey_args:
:param display_name:
:param posting_address:
:param request_address:
:return: `PGPKey`
"""
common_params = dict(
hashes=[HashAlgorithm.SHA256,
HashAlgorithm.SHA384,
HashAlgorithm.SHA512,
HashAlgorithm.SHA224],
ciphers=[SymmetricKeyAlgorithm.AES256,
SymmetricKeyAlgorithm.AES192,
SymmetricKeyAlgorithm.AES128],
compression=[CompressionAlgorithm.ZLIB,
CompressionAlgorithm.BZ2,
CompressionAlgorithm.ZIP,
CompressionAlgorithm.Uncompressed]
)
# Generate the Sign + Certify primary key.
key = PGPKey.new(*primary_args)
key_params = dict(usage={KeyFlags.Sign, KeyFlags.Certify},
**common_params)
# Generate the posting + request uids.
main_uid = PGPUID.new(display_name, email=posting_address)
request_uid = PGPUID.new(display_name,
email=request_address)
# Generate the Encrypt subkey.
subkey = PGPKey.new(*subkey_args)
subkey_params = dict(
usage={KeyFlags.EncryptCommunications,
KeyFlags.EncryptStorage},
**common_params
)
# Put it all together.
key.add_uid(main_uid, primary=True, **key_params)
key.add_uid(request_uid, **key_params)
key.add_subkey(subkey, **subkey_params)
return key
def _save(self, key, key_path):
"""
Save the generated key.
:param key:
:param key_path:
"""
try:
with open(key_path, 'w') as key_file:
key_file.write(str(key))
except FileNotFoundError:
# Just eat it up.
pass
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