1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
# Copyright 2013 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Keystone External Authentication Plugins"""
import abc
from oslo_config import cfg
import six
from keystone import auth
from keystone.common import dependency
from keystone import exception
from keystone.i18n import _
CONF = cfg.CONF
@six.add_metaclass(abc.ABCMeta)
class Base(auth.AuthMethodHandler):
def authenticate(self, context, auth_info, auth_context):
"""Use REMOTE_USER to look up the user in the identity backend.
auth_context is an in-out variable that will be updated with the
user_id from the actual user from the REMOTE_USER env variable.
"""
try:
REMOTE_USER = context['environment']['REMOTE_USER']
except KeyError:
msg = _('No authenticated user')
raise exception.Unauthorized(msg)
try:
user_ref = self._authenticate(REMOTE_USER, context)
auth_context['user_id'] = user_ref['id']
if ('kerberos' in CONF.token.bind and
(context['environment'].get('AUTH_TYPE', '').lower()
== 'negotiate')):
auth_context['bind']['kerberos'] = user_ref['name']
except Exception:
msg = _('Unable to lookup user %s') % (REMOTE_USER)
raise exception.Unauthorized(msg)
@abc.abstractmethod
def _authenticate(self, remote_user, context):
"""Look up the user in the identity backend.
Return user_ref
"""
pass
@dependency.requires('identity_api')
class DefaultDomain(Base):
def _authenticate(self, remote_user, context):
"""Use remote_user to look up the user in the identity backend."""
domain_id = CONF.identity.default_domain_id
user_ref = self.identity_api.get_user_by_name(remote_user, domain_id)
return user_ref
@dependency.requires('identity_api', 'resource_api')
class Domain(Base):
def _authenticate(self, remote_user, context):
"""Use remote_user to look up the user in the identity backend.
The domain will be extracted from the REMOTE_DOMAIN environment
variable if present. If not, the default domain will be used.
"""
username = remote_user
try:
domain_name = context['environment']['REMOTE_DOMAIN']
except KeyError:
domain_id = CONF.identity.default_domain_id
else:
domain_ref = self.resource_api.get_domain_by_name(domain_name)
domain_id = domain_ref['id']
user_ref = self.identity_api.get_user_by_name(username, domain_id)
return user_ref
class KerberosDomain(Domain):
"""Allows `kerberos` as a method."""
def _authenticate(self, remote_user, context):
auth_type = context['environment'].get('AUTH_TYPE')
if auth_type != 'Negotiate':
raise exception.Unauthorized(_("auth_type is not Negotiate"))
return super(KerberosDomain, self)._authenticate(remote_user, context)
|
