gajim-plural/gajim/common/passwords.py

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# Copyright (C) 2006 Gustavo J. A. M. Carneiro <gjcarneiro AT gmail.com>
# Nikos Kouremenos <kourem AT gmail.com>
# Copyright (C) 2006-2014 Yann Leboulanger <asterix AT lagaule.org>
# Copyright (C) 2007 Jean-Marie Traissard <jim AT lapin.org>
# Julien Pivotto <roidelapluie AT gmail.com>
# Copyright (C) 2008 Stephan Erb <steve-e AT h3c.de>
# Copyright (c) 2009 Thorsten Glaser <t.glaser AT tarent.de>
#
# This file is part of Gajim.
#
# Gajim 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; version 3 only.
#
# Gajim 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 Gajim. If not, see <http://www.gnu.org/licenses/>.
import logging
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from gajim.common import app
__all__ = ['get_password', 'save_password']
log = logging.getLogger('gajim.password')
try:
import keyring
from keyring.core import recommended
KEYRING_AVAILABLE = True
except ImportError:
KEYRING_AVAILABLE = False
log.warning('python-keyring missing, falling back to plaintext storage')
class PasswordStorage:
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"""Interface for password stores"""
def get_password(self, account_name):
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"""Return the password for account_name, or None if not found."""
raise NotImplementedError
def save_password(self, account_name, password):
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"""Save password for account_name. Return a bool indicating success."""
raise NotImplementedError
def delete_password(self, account_name):
"""Delete password for account_name. Return a bool indicating success."""
raise NotImplementedError
class SecretPasswordStorage(PasswordStorage):
""" Store password using Keyring """
identifier = 'keyring:'
def __init__(self):
self.keyring = keyring.get_keyring()
log.info('Select %s backend', self.keyring)
def save_password(self, account_name, password):
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try:
log.info('Save password to keyring')
self.keyring.set_password('gajim', account_name, password)
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return True
except Exception:
log.exception('Save password failed')
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return False
def get_password(self, account_name):
log.info('Request password from keyring')
try:
return self.keyring.get_password('gajim', account_name)
except Exception:
log.exception('Request password failed')
return
def delete_password(self, account_name):
log.info('Remove password from keyring')
try:
return self.keyring.delete_password('gajim', account_name)
except Exception:
log.exception('Remove password failed')
return
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class PasswordStorageManager(PasswordStorage):
"""Access all the implemented password storage backends, knowing which ones
are available and which we prefer to use.
Also implements storing directly in gajim config."""
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def __init__(self):
self.preferred_backend = None
self.secret = None
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self.connect_backends()
self.set_preferred_backend()
def connect_backends(self):
"""Initialize backend connections, determining which ones are available.
"""
if not app.config.get('use_keyring') or not KEYRING_AVAILABLE:
return
backends = keyring.backend.get_all_keyring()
for backend in backends:
log.info('Found keyring backend: %s', backend)
for backend in backends:
if recommended(backend):
self.secret = SecretPasswordStorage()
return
log.warning('No recommended keyring backend found, '
'plain storage is used')
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def get_password(self, account_name):
pw = app.config.get_per('accounts', account_name, 'password')
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if not pw:
return pw
if pw.startswith(SecretPasswordStorage.identifier) and self.secret:
backend = self.secret
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else:
backend = None
if backend:
pw = backend.get_password(account_name)
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if backend != self.preferred_backend:
# migrate password to preferred_backend
self.save_password(account_name, pw)
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return pw
def save_password(self, account_name, password):
if account_name in app.connections:
app.connections[account_name].password = password
if not app.config.get_per('accounts', account_name, 'savepass'):
return True
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if self.preferred_backend:
if self.preferred_backend.save_password(account_name, password):
app.config.set_per('accounts', account_name, 'password',
self.preferred_backend.identifier)
else:
app.config.set_per('accounts', account_name, 'password', password)
return True
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def delete_password(self, account_name):
if account_name in app.connections:
app.connections[account_name].password = None
if self.preferred_backend is not None:
self.preferred_backend.delete_password(account_name)
app.config.set_per('accounts', account_name, 'password', None)
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return True
def set_preferred_backend(self):
if self.secret:
self.preferred_backend = self.secret
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else:
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self.preferred_backend = None
passwordStorageManager = None
def get_storage():
global passwordStorageManager
if not passwordStorageManager:
passwordStorageManager = PasswordStorageManager()
return passwordStorageManager
def get_password(account_name):
return get_storage().get_password(account_name)
def delete_password(account_name):
return get_storage().delete_password(account_name)
def save_password(account_name, password):
return get_storage().save_password(account_name, password)