496 lines
18 KiB
Python
496 lines
18 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import json
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from keystone.common import cms
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from keystone.common import controller
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from keystone.common import dependency
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from keystone.common import wsgi
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from keystone import config
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from keystone import exception
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from keystone.openstack.common import log as logging
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from keystone.openstack.common import timeutils
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from keystone.token import core
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CONF = config.CONF
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LOG = logging.getLogger(__name__)
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DEFAULT_DOMAIN_ID = CONF.identity.default_domain_id
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class ExternalAuthNotApplicable(Exception):
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"""External authentication is not applicable."""
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pass
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@dependency.requires('token_provider_api')
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class Auth(controller.V2Controller):
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def ca_cert(self, context, auth=None):
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ca_file = open(CONF.signing.ca_certs, 'r')
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data = ca_file.read()
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ca_file.close()
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return data
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def signing_cert(self, context, auth=None):
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cert_file = open(CONF.signing.certfile, 'r')
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data = cert_file.read()
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cert_file.close()
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return data
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def authenticate(self, context, auth=None):
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"""Authenticate credentials and return a token.
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Accept auth as a dict that looks like::
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{
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"auth":{
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"passwordCredentials":{
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"username":"test_user",
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"password":"mypass"
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},
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"tenantName":"customer-x"
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}
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}
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In this case, tenant is optional, if not provided the token will be
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considered "unscoped" and can later be used to get a scoped token.
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Alternatively, this call accepts auth with only a token and tenant
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that will return a token that is scoped to that tenant.
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"""
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if auth is None:
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raise exception.ValidationError(attribute='auth',
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target='request body')
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auth_token_data = None
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if "token" in auth:
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# Try to authenticate using a token
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auth_info = self._authenticate_token(
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context, auth)
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else:
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# Try external authentication
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try:
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auth_info = self._authenticate_external(
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context, auth)
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except ExternalAuthNotApplicable:
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# Try local authentication
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auth_info = self._authenticate_local(
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context, auth)
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user_ref, tenant_ref, metadata_ref, expiry, bind = auth_info
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core.validate_auth_info(self, user_ref, tenant_ref)
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# NOTE(morganfainberg): Make sure the data is in correct form since it
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# might be consumed external to Keystone and this is a v2.0 controller.
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# The user_ref is encoded into the auth_token_data which is returned as
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# part of the token data. The token provider doesn't care about the
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# format.
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user_ref = self.identity_api.v3_to_v2_user(user_ref)
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if tenant_ref:
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tenant_ref = self.filter_domain_id(tenant_ref)
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auth_token_data = self._get_auth_token_data(user_ref,
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tenant_ref,
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metadata_ref,
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expiry)
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if tenant_ref:
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catalog_ref = self.catalog_api.get_catalog(
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user_ref['id'], tenant_ref['id'], metadata_ref)
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else:
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catalog_ref = {}
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auth_token_data['id'] = 'placeholder'
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if bind:
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auth_token_data['bind'] = bind
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roles_ref = []
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for role_id in metadata_ref.get('roles', []):
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role_ref = self.assignment_api.get_role(role_id)
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roles_ref.append(dict(name=role_ref['name']))
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(token_id, token_data) = self.token_provider_api.issue_v2_token(
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auth_token_data, roles_ref=roles_ref, catalog_ref=catalog_ref)
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return token_data
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def _authenticate_token(self, context, auth):
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"""Try to authenticate using an already existing token.
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Returns auth_token_data, (user_ref, tenant_ref, metadata_ref)
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"""
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if 'token' not in auth:
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raise exception.ValidationError(
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attribute='token', target='auth')
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if "id" not in auth['token']:
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raise exception.ValidationError(
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attribute="id", target="token")
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old_token = auth['token']['id']
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if len(old_token) > CONF.max_token_size:
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raise exception.ValidationSizeError(attribute='token',
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size=CONF.max_token_size)
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try:
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old_token_ref = self.token_api.get_token(old_token)
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except exception.NotFound as e:
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raise exception.Unauthorized(e)
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wsgi.validate_token_bind(context, old_token_ref)
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#A trust token cannot be used to get another token
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if 'trust' in old_token_ref:
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raise exception.Forbidden()
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if 'trust_id' in old_token_ref['metadata']:
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raise exception.Forbidden()
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user_ref = old_token_ref['user']
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user_id = user_ref['id']
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if not CONF.trust.enabled and 'trust_id' in auth:
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raise exception.Forbidden('Trusts are disabled.')
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elif CONF.trust.enabled and 'trust_id' in auth:
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trust_ref = self.trust_api.get_trust(auth['trust_id'])
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if trust_ref is None:
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raise exception.Forbidden()
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if user_id != trust_ref['trustee_user_id']:
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raise exception.Forbidden()
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if ('expires' in trust_ref) and (trust_ref['expires']):
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expiry = trust_ref['expires']
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if expiry < timeutils.parse_isotime(timeutils.isotime()):
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raise exception.Forbidden()()
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user_id = trust_ref['trustor_user_id']
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trustor_user_ref = self.identity_api.get_user(
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trust_ref['trustor_user_id'])
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if not trustor_user_ref['enabled']:
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raise exception.Forbidden()()
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trustee_user_ref = self.identity_api.get_user(
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trust_ref['trustee_user_id'])
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if not trustee_user_ref['enabled']:
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raise exception.Forbidden()()
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if trust_ref['impersonation'] is True:
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current_user_ref = trustor_user_ref
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else:
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current_user_ref = trustee_user_ref
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else:
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current_user_ref = self.identity_api.get_user(user_id)
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metadata_ref = {}
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tenant_id = self._get_project_id_from_auth(auth)
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tenant_ref, metadata_ref['roles'] = self._get_project_roles_and_ref(
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user_id, tenant_id)
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expiry = old_token_ref['expires']
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if CONF.trust.enabled and 'trust_id' in auth:
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trust_id = auth['trust_id']
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trust_roles = []
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for role in trust_ref['roles']:
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if 'roles' not in metadata_ref:
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raise exception.Forbidden()()
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if role['id'] in metadata_ref['roles']:
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trust_roles.append(role['id'])
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else:
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raise exception.Forbidden()
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if 'expiry' in trust_ref and trust_ref['expiry']:
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trust_expiry = timeutils.parse_isotime(trust_ref['expiry'])
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if trust_expiry < expiry:
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expiry = trust_expiry
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metadata_ref['roles'] = trust_roles
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metadata_ref['trustee_user_id'] = trust_ref['trustee_user_id']
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metadata_ref['trust_id'] = trust_id
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bind = old_token_ref.get('bind', None)
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return (current_user_ref, tenant_ref, metadata_ref, expiry, bind)
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def _authenticate_local(self, context, auth):
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"""Try to authenticate against the identity backend.
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Returns auth_token_data, (user_ref, tenant_ref, metadata_ref)
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"""
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if 'passwordCredentials' not in auth:
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raise exception.ValidationError(
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attribute='passwordCredentials', target='auth')
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if "password" not in auth['passwordCredentials']:
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raise exception.ValidationError(
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attribute='password', target='passwordCredentials')
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password = auth['passwordCredentials']['password']
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if password and len(password) > CONF.identity.max_password_length:
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raise exception.ValidationSizeError(
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attribute='password', size=CONF.identity.max_password_length)
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if ("userId" not in auth['passwordCredentials'] and
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"username" not in auth['passwordCredentials']):
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raise exception.ValidationError(
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attribute='username or userId',
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target='passwordCredentials')
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user_id = auth['passwordCredentials'].get('userId', None)
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if user_id and len(user_id) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='userId',
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size=CONF.max_param_size)
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username = auth['passwordCredentials'].get('username', '')
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if len(username) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='username',
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size=CONF.max_param_size)
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if username:
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try:
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user_ref = self.identity_api.get_user_by_name(
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username, DEFAULT_DOMAIN_ID)
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user_id = user_ref['id']
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except exception.UserNotFound as e:
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raise exception.Unauthorized(e)
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try:
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user_ref = self.identity_api.authenticate(
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user_id=user_id,
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password=password)
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except AssertionError as e:
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raise exception.Unauthorized(e)
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metadata_ref = {}
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tenant_id = self._get_project_id_from_auth(auth)
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tenant_ref, metadata_ref['roles'] = self._get_project_roles_and_ref(
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user_id, tenant_id)
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expiry = core.default_expire_time()
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return (user_ref, tenant_ref, metadata_ref, expiry, None)
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def _authenticate_external(self, context, auth):
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"""Try to authenticate an external user via REMOTE_USER variable.
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Returns auth_token_data, (user_ref, tenant_ref, metadata_ref)
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"""
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if 'REMOTE_USER' not in context.get('environment', {}):
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raise ExternalAuthNotApplicable()
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#NOTE(jamielennox): xml and json differ and get confused about what
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# empty auth should look like so just reset it.
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if not auth:
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auth = {}
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username = context['environment']['REMOTE_USER']
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try:
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user_ref = self.identity_api.get_user_by_name(
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username, DEFAULT_DOMAIN_ID)
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user_id = user_ref['id']
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except exception.UserNotFound as e:
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raise exception.Unauthorized(e)
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metadata_ref = {}
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tenant_id = self._get_project_id_from_auth(auth)
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tenant_ref, metadata_ref['roles'] = self._get_project_roles_and_ref(
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user_id, tenant_id)
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expiry = core.default_expire_time()
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bind = None
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if ('kerberos' in CONF.token.bind and
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context['environment'].
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get('AUTH_TYPE', '').lower() == 'negotiate'):
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bind = {'kerberos': username}
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return (user_ref, tenant_ref, metadata_ref, expiry, bind)
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def _get_auth_token_data(self, user, tenant, metadata, expiry):
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return dict(user=user,
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tenant=tenant,
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metadata=metadata,
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expires=expiry)
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def _get_project_id_from_auth(self, auth):
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"""Extract tenant information from auth dict.
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Returns a valid tenant_id if it exists, or None if not specified.
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"""
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tenant_id = auth.get('tenantId', None)
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if tenant_id and len(tenant_id) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='tenantId',
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size=CONF.max_param_size)
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tenant_name = auth.get('tenantName', None)
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if tenant_name and len(tenant_name) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='tenantName',
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size=CONF.max_param_size)
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if tenant_name:
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try:
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tenant_ref = self.assignment_api.get_project_by_name(
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tenant_name, DEFAULT_DOMAIN_ID)
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tenant_id = tenant_ref['id']
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except exception.ProjectNotFound as e:
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raise exception.Unauthorized(e)
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return tenant_id
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def _get_domain_id_from_auth(self, auth):
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"""Extract domain information from v3 auth dict.
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Returns a valid domain_id if it exists, or None if not specified.
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"""
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# FIXME(henry-nash): This is a placeholder that needs to be
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# only called in the v3 context, and the auth.get calls
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# converted to the v3 format
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domain_id = auth.get('domainId', None)
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domain_name = auth.get('domainName', None)
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if domain_name:
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try:
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domain_ref = self.assignment_api.get_domain_by_name(
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domain_name)
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domain_id = domain_ref['id']
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except exception.DomainNotFound as e:
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raise exception.Unauthorized(e)
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return domain_id
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def _get_project_roles_and_ref(self, user_id, tenant_id):
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"""Returns the project roles for this user, and the project ref."""
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tenant_ref = None
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role_list = []
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if tenant_id:
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try:
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tenant_ref = self.assignment_api.get_project(tenant_id)
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role_list = self.assignment_api.get_roles_for_user_and_project(
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user_id, tenant_id)
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except exception.ProjectNotFound:
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pass
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if not role_list:
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msg = _('User %(u_id)s is unauthorized for tenant %(t_id)s')
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msg = msg % {'u_id': user_id, 't_id': tenant_id}
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LOG.warning(msg)
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raise exception.Unauthorized(msg)
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return (tenant_ref, role_list)
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def _get_token_ref(self, token_id, belongs_to=None):
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"""Returns a token if a valid one exists.
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Optionally, limited to a token owned by a specific tenant.
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"""
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data = self.token_api.get_token(token_id)
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if belongs_to:
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if data.get('tenant') is None:
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raise exception.Unauthorized(
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_('Token does not belong to specified tenant.'))
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if data['tenant'].get('id') != belongs_to:
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raise exception.Unauthorized(
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_('Token does not belong to specified tenant.'))
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return data
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@controller.protected()
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def validate_token_head(self, context, token_id):
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"""Check that a token is valid.
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Optionally, also ensure that it is owned by a specific tenant.
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Identical to ``validate_token``, except does not return a response.
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"""
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belongs_to = context['query_string'].get('belongsTo')
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self.token_provider_api.check_v2_token(token_id, belongs_to)
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@controller.protected()
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def validate_token(self, context, token_id):
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"""Check that a token is valid.
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Optionally, also ensure that it is owned by a specific tenant.
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Returns metadata about the token along any associated roles.
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"""
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belongs_to = context['query_string'].get('belongsTo')
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return self.token_provider_api.validate_v2_token(token_id, belongs_to)
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def delete_token(self, context, token_id):
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"""Delete a token, effectively invalidating it for authz."""
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# TODO(termie): this stuff should probably be moved to middleware
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self.assert_admin(context)
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self.token_api.delete_token(token_id)
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@controller.protected()
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def revocation_list(self, context, auth=None):
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tokens = self.token_api.list_revoked_tokens()
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for t in tokens:
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expires = t['expires']
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if not (expires and isinstance(expires, unicode)):
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t['expires'] = timeutils.isotime(expires)
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data = {'revoked': tokens}
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json_data = json.dumps(data)
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signed_text = cms.cms_sign_text(json_data,
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CONF.signing.certfile,
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CONF.signing.keyfile)
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return {'signed': signed_text}
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def endpoints(self, context, token_id):
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"""Return a list of endpoints available to the token."""
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self.assert_admin(context)
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token_ref = self._get_token_ref(token_id)
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catalog_ref = None
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if token_ref.get('tenant'):
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catalog_ref = self.catalog_api.get_catalog(
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token_ref['user']['id'],
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token_ref['tenant']['id'],
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token_ref['metadata'])
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return Auth.format_endpoint_list(catalog_ref)
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@classmethod
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def format_endpoint_list(cls, catalog_ref):
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"""Formats a list of endpoints according to Identity API v2.
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The v2.0 API wants an endpoint list to look like::
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{
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'endpoints': [
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{
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'id': $endpoint_id,
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'name': $SERVICE[name],
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'type': $SERVICE,
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'tenantId': $tenant_id,
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'region': $REGION,
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}
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],
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'endpoints_links': [],
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}
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"""
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if not catalog_ref:
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return {}
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endpoints = []
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for region_name, region_ref in catalog_ref.iteritems():
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for service_type, service_ref in region_ref.iteritems():
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endpoints.append({
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'id': service_ref.get('id'),
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'name': service_ref.get('name'),
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'type': service_type,
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'region': region_name,
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'publicURL': service_ref.get('publicURL'),
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'internalURL': service_ref.get('internalURL'),
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'adminURL': service_ref.get('adminURL'),
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})
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return {'endpoints': endpoints, 'endpoints_links': []}
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