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# Copyright (C) 2014 Aleksey Lim
#
# 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/>.
import time
import hashlib
import logging
from ConfigParser import ConfigParser
from os.path import join, exists
from sugar_network.toolkit.coroutine import this
from sugar_network.toolkit import pylru, http, enforce
_SIGNATURE_LIFETIME = 600
_AUTH_POOL_SIZE = 1024
_logger = logging.getLogger('node.auth')
class Unauthorized(http.Unauthorized):
def __init__(self, message, nonce=None):
http.Unauthorized.__init__(self, message)
if not nonce:
nonce = int(time.time()) + _SIGNATURE_LIFETIME
self.headers = {'www-authenticate': 'Sugar nonce="%s"' % nonce}
class Principal(str):
def __new__(cls, value, caps=0):
if not isinstance(value, basestring):
value, caps = value
self = str.__new__(cls, value)
# pylint: disable-msg=W0212
self._caps = caps
self._backup = 0
return self
@property
def cap_author_override(self):
return self._caps & 1
@cap_author_override.setter
def cap_author_override(self, value):
if value:
self._caps |= 1
else:
self._caps ^= 1
@property
def cap_create_with_guid(self):
return self._caps & 2
@cap_create_with_guid.setter
def cap_create_with_guid(self, value):
if value:
self._caps |= 2
else:
self._caps ^= 2
@property
def cap_admin(self):
return self._caps & 4
@cap_admin.setter
def cap_admin(self, value):
if value:
self._caps |= 4
else:
self._caps ^= 4
def __enter__(self):
self._backup = self._caps
return self
def __exit__(self, exc_type, exc_value, traceback):
self._caps = self._backup
def dump(self):
return self, self._caps
class SugarAuth(object):
def __init__(self, root):
self._config_path = join(root, 'etc', 'authorization.conf')
self._pool = pylru.lrucache(_AUTH_POOL_SIZE)
self._config = None
def reload(self):
self._config = ConfigParser()
if exists(self._config_path):
self._config.read(self._config_path)
self._pool.clear()
def logon(self, request):
auth = request.environ.get('HTTP_AUTHORIZATION')
enforce(auth, Unauthorized, 'No credentials')
if self._config is None:
self.reload()
from M2Crypto import RSA, BIO
from urllib2 import parse_http_list, parse_keqv_list
if auth in self._pool:
login, nonce = self._pool[auth]
else:
scheme, creds = auth.strip().split(' ', 1)
enforce(scheme.lower() == 'sugar', http.BadRequest,
'Unsupported authentication scheme')
creds = parse_keqv_list(parse_http_list(creds))
login = creds['username']
signature = creds['signature']
nonce = int(creds['nonce'])
user = this.volume['user'][login]
enforce(user.available, Unauthorized, 'Principal does not exist')
key = RSA.load_pub_key_bio(BIO.MemoryBuffer(str(user['pubkey'])))
data = hashlib.sha1('%s:%s' % (login, nonce)).digest()
enforce(key.verify(data, signature.decode('hex')),
http.Forbidden, 'Bad credentials')
self._pool[auth] = (login, nonce)
enforce(abs(time.time() - nonce) <= _SIGNATURE_LIFETIME,
Unauthorized, 'Credentials expired')
principal = Principal(login)
user = principal
if not self._config.has_option('permissions', user):
user = 'default'
if not self._config.has_option('permissions', user):
user = None
if user:
for role in self._config.get('permissions', user).split():
role = role.lower()
if role == 'admin':
principal.cap_author_override = True
principal.cap_create_with_guid = True
# TODO
return principal
class RootAuth(object):
def logon(self, request):
return Principal('root', 0xFFFF)
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