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#
# Copyright (c) 2014 ThoughtWorks, Inc.
#
# Pixelated is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pixelated 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
from twisted.internet import defer
from twisted.logger import Logger
from leap.bitmask.keymanager import KeyManager, KeyNotFound
from pixelated.config import leap_config
logger = Logger()
class UploadKeyError(Exception):
pass
TWO_MONTHS = 60
DEFAULT_EXTENSION_THRESHOLD = TWO_MONTHS
class Keymanager(object):
def __init__(self, provider, soledad, email_address, token, uuid):
nicknym_url = provider._discover_nicknym_server()
self._email = email_address
self.keymanager = KeyManager(self._email, nicknym_url,
soledad,
token=token, ca_cert_path=provider.provider_api_cert, api_uri=provider.api_uri,
api_version=provider.api_version,
uid=uuid, gpgbinary=leap_config.gpg_binary,
combined_ca_bundle=provider.combined_cerfificates_path)
@defer.inlineCallbacks
def generate_openpgp_key(self):
current_key = yield self._key_exists(self._email)
if not current_key:
current_key = yield self._generate_key_and_send_to_leap()
elif current_key.needs_renewal(DEFAULT_EXTENSION_THRESHOLD):
current_key = yield self._regenerate_key_and_send_to_leap()
self._synchronize_remote_key(current_key)
logger.debug("Current key for {}: {}".format(self._email, current_key.fingerprint))
@defer.inlineCallbacks
def _synchronize_remote_key(self, current_key):
if not self._is_key_synchronized_with_server(current_key):
try:
yield self.keymanager.send_key()
except Exception as e:
raise UploadKeyError(e.message)
@defer.inlineCallbacks
def _is_key_synchronized_with_server(self, current_key):
remote_key = yield self.get_key(self._email, private=False, fetch_remote=True)
defer.returnValue(remote_key.fingerprint == current_key.fingerprint)
@defer.inlineCallbacks
def _regenerate_key_and_send_to_leap(self):
logger.info("Regenerating keys - this could take a while...")
key = yield self.keymanager.regenerate_key()
try:
yield self.keymanager.send_key()
defer.returnValue(key)
except Exception as e:
raise UploadKeyError(e.message)
@defer.inlineCallbacks
def _generate_key_and_send_to_leap(self):
logger.info("Generating keys - this could take a while...")
key = yield self.keymanager.gen_key()
try:
yield self.keymanager.send_key()
defer.returnValue(key)
except Exception as e:
yield self.delete_key_pair()
raise UploadKeyError(e.message)
@defer.inlineCallbacks
def _key_exists(self, email):
try:
current_key = yield self.get_key(email, private=True, fetch_remote=False)
defer.returnValue(current_key)
except KeyNotFound:
defer.returnValue(None)
@defer.inlineCallbacks
def get_key(self, email, private=False, fetch_remote=True):
key = yield self.keymanager.get_key(email, private=private, fetch_remote=fetch_remote)
defer.returnValue(key)
@defer.inlineCallbacks
def delete_key_pair(self):
private_key = yield self.get_key(self._email, private=True, fetch_remote=False)
public_key = yield self.get_key(self._email, private=False, fetch_remote=False)
self.keymanager.delete_key(private_key)
self.keymanager.delete_key(public_key)
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