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# -*- coding: utf-8 -*-
# keyring_helpers.py
# Copyright (C) 2013 LEAP
#
# 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/>.
"""
Keyring helpers.
"""
import logging
try:
import keyring
from keyring.backends.file import EncryptedKeyring, PlaintextKeyring
OBSOLETE_KEYRINGS = [
EncryptedKeyring,
PlaintextKeyring
]
canuse = lambda kr: (kr is not None
and kr.__class__ not in OBSOLETE_KEYRINGS)
except Exception:
# Problems when importing keyring! It might be a problem binding to the
# dbus socket, or stuff like that.
keyring = None
logger = logging.getLogger(__name__)
def _get_keyring_with_fallback():
"""
Get the default keyring, and if obsolete try to pick SecretService keyring
if available.
This is a workaround for the cases in which the keyring module chooses
an insecure keyring by default (ie, inside a virtualenv).
"""
if keyring is None:
return None
kr = keyring.get_keyring()
if not canuse(kr):
try:
kr_klass = keyring.backends.SecretService
kr = kr_klass.Keyring()
except AttributeError:
logger.warning("Keyring cannot find SecretService Backend")
logger.debug("Selected keyring: %s" % (kr.__class__,))
if not canuse(kr):
logger.debug("Not using default keyring since it is obsolete")
return kr
def has_keyring():
"""
Return whether we have an useful keyring to use.
:rtype: bool
"""
if keyring is None:
return False
kr = _get_keyring_with_fallback()
return canuse(kr)
def get_keyring():
"""
Return an usable keyring.
:rtype: keyringBackend or None
"""
if keyring is None:
return False
kr = _get_keyring_with_fallback()
return kr if canuse(kr) else None
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