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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/>.
"""Model for PGP enabled mailing lists."""
from os.path import exists, isfile, join
from flufl.lock import Lock
from mailman.database.types import Enum, SAUnicode
from mailman.interfaces.action import Action
from mailman.interfaces.listmanager import IListManager, ListDeletedEvent
from pgpy import PGPKey
from public import public
from sqlalchemy import Boolean, Column, Integer
from sqlalchemy.orm import reconstructor
from zope.component import getUtility
from zope.event import classhandler
from mailman_pgp.config import config
from mailman_pgp.database import transaction
from mailman_pgp.model.base import Base
from mailman_pgp.pgp.keygen import ListKeyGenerator
@public
class PGPMailingList(Base):
"""A PGP enabled mailing list."""
__tablename__ = 'pgp_lists'
id = Column(Integer, primary_key=True)
list_id = Column(SAUnicode, index=True)
# Signature related properties
unsigned_msg_action = Column(Enum(Action), default=Action.reject)
inline_pgp_action = Column(Enum(Action), default=Action.defer)
expired_sig_action = Column(Enum(Action), default=Action.reject)
revoked_sig_action = Column(Enum(Action), default=Action.reject)
invalid_sig_action = Column(Enum(Action), default=Action.reject)
duplicate_sig_action = Column(Enum(Action), default=Action.reject)
strip_original_sig = Column(Boolean, default=False)
sign_outgoing = Column(Boolean, default=False)
# Encryption related properties
nonencrypted_msg_action = Column(Enum(Action), default=Action.reject)
encrypt_outgoing = Column(Boolean, default=True)
def __init__(self, mlist):
super().__init__()
self._init()
self.list_id = mlist.list_id
self._mlist = mlist
@reconstructor
def _init(self):
self._mlist = None
self._key = None
self._key_generator = None
@property
def mlist(self):
"""
:return:
:rtype: mailman.model.mailinglist.MailingList
"""
if self._mlist is None:
self._mlist = getUtility(IListManager).get_by_list_id(self.list_id)
return self._mlist
@property
def key(self):
"""
:return:
:rtype: pgpy.PGPKey
"""
if self._key is None:
# Check the file
if exists(self.key_path) and isfile(self.key_path):
self._key, _ = PGPKey.from_file(self.key_path)
return self._key
@key.setter
def key(self, value):
with Lock(self.key_path + '.lock'):
self._key = value
with open(self.key_path, 'w') as key_file:
key_file.write(str(value))
def generate_key(self, block=False):
self._key = None
self._key_generator = ListKeyGenerator(config.pgp.primary_key_args,
config.pgp.sub_key_args,
self.mlist.display_name,
self.mlist.posting_address,
self.mlist.request_address,
self.key_path)
self._key_generator.start()
if block:
self._key_generator.join()
return self.key
@property
def pubkey(self):
"""
:return:
:rtype: pgpy.PGPKey
"""
if self.key is None:
return None
return self.key.pubkey
@property
def key_path(self):
"""
:return:
:rtype: str
"""
return join(config.pgp.keydir_config['list_keydir'],
self.list_id + '.asc')
@staticmethod
def for_list(mlist):
"""
:param mlist:
:return:
:rtype: PGPMailingList|None
"""
if mlist is None:
return None
return PGPMailingList.query().filter_by(list_id=mlist.list_id).first()
@classhandler.handler(ListDeletedEvent)
def on_delete(mlist):
pgp_list = PGPMailingList.for_list(mlist)
if pgp_list:
with transaction() as session:
# TODO shred the list key
session.delete(pgp_list)
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