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# Copyright 2012 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.

import subprocess
import uuid

import ldap
import ldap.modlist
from oslo_config import cfg

from keystone import exception
from keystone.identity.backends import ldap as identity_ldap
from keystone.tests import unit as tests
from keystone.tests.unit import test_backend_ldap


CONF = cfg.CONF


def create_object(dn, attrs):
    conn = ldap.initialize(CONF.ldap.url)
    conn.simple_bind_s(CONF.ldap.user, CONF.ldap.password)
    ldif = ldap.modlist.addModlist(attrs)
    conn.add_s(dn, ldif)
    conn.unbind_s()


class LiveLDAPIdentity(test_backend_ldap.LDAPIdentity):

    def setUp(self):
        self._ldap_skip_live()
        super(LiveLDAPIdentity, self).setUp()

    def _ldap_skip_live(self):
        self.skip_if_env_not_set('ENABLE_LDAP_LIVE_TEST')

    def clear_database(self):
        devnull = open('/dev/null', 'w')
        subprocess.call(['ldapdelete',
                         '-x',
                         '-D', CONF.ldap.user,
                         '-H', CONF.ldap.url,
                         '-w', CONF.ldap.password,
                         '-r', CONF.ldap.suffix],
                        stderr=devnull)

        if CONF.ldap.suffix.startswith('ou='):
            tree_dn_attrs = {'objectclass': 'organizationalUnit',
                             'ou': 'openstack'}
        else:
            tree_dn_attrs = {'objectclass': ['dcObject', 'organizationalUnit'],
                             'dc': 'openstack',
                             'ou': 'openstack'}
        create_object(CONF.ldap.suffix, tree_dn_attrs)
        create_object(CONF.ldap.user_tree_dn,
                      {'objectclass': 'organizationalUnit',
                       'ou': 'Users'})
        create_object(CONF.ldap.role_tree_dn,
                      {'objectclass': 'organizationalUnit',
                       'ou': 'Roles'})
        create_object(CONF.ldap.project_tree_dn,
                      {'objectclass': 'organizationalUnit',
                       'ou': 'Projects'})
        create_object(CONF.ldap.group_tree_dn,
                      {'objectclass': 'organizationalUnit',
                       'ou': 'UserGroups'})

    def config_files(self):
        config_files = super(LiveLDAPIdentity, self).config_files()
        config_files.append(tests.dirs.tests_conf('backend_liveldap.conf'))
        return config_files

    def config_overrides(self):
        super(LiveLDAPIdentity, self).config_overrides()
        self.config_fixture.config(
            group='identity',
            driver='keystone.identity.backends.ldap.Identity')

    def test_build_tree(self):
        """Regression test for building the tree names
        """
        # logic is different from the fake backend.
        user_api = identity_ldap.UserApi(CONF)
        self.assertTrue(user_api)
        self.assertEqual(user_api.tree_dn, CONF.ldap.user_tree_dn)

    def tearDown(self):
        tests.TestCase.tearDown(self)

    def test_ldap_dereferencing(self):
        alt_users_ldif = {'objectclass': ['top', 'organizationalUnit'],
                          'ou': 'alt_users'}
        alt_fake_user_ldif = {'objectclass': ['person', 'inetOrgPerson'],
                              'cn': 'alt_fake1',
                              'sn': 'alt_fake1'}
        aliased_users_ldif = {'objectclass': ['alias', 'extensibleObject'],
                              'aliasedobjectname': "ou=alt_users,%s" %
                              CONF.ldap.suffix}
        create_object("ou=alt_users,%s" % CONF.ldap.suffix, alt_users_ldif)
        create_object("%s=alt_fake1,ou=alt_users,%s" %
                      (CONF.ldap.user_id_attribute, CONF.ldap.suffix),
                      alt_fake_user_ldif)
        create_object("ou=alt_users,%s" % CONF.ldap.user_tree_dn,
                      aliased_users_ldif)

        self.config_fixture.config(group='ldap',
                                   query_scope='sub',
                                   alias_dereferencing='never')
        self.identity_api = identity_ldap.Identity()
        self.assertRaises(exception.UserNotFound,
                          self.identity_api.get_user,
                          'alt_fake1')

        self.config_fixture.config(group='ldap',
                                   alias_dereferencing='searching')
        self.identity_api = identity_ldap.Identity()
        user_ref = self.identity_api.get_user('alt_fake1')
        self.assertEqual('alt_fake1', user_ref['id'])

        self.config_fixture.config(group='ldap', alias_dereferencing='always')
        self.identity_api = identity_ldap.Identity()
        user_ref = self.identity_api.get_user('alt_fake1')
        self.assertEqual('alt_fake1', user_ref['id'])

    # FakeLDAP does not correctly process filters, so this test can only be
    # run against a live LDAP server
    def test_list_groups_for_user_filtered(self):
        domain = self._get_domain_fixture()
        test_groups = []
        test_users = []
        GROUP_COUNT = 3
        USER_COUNT = 2

        for x in range(0, USER_COUNT):
            new_user = {'name': uuid.uuid4().hex, 'password': uuid.uuid4().hex,
                        'enabled': True, 'domain_id': domain['id']}
            new_user = self.identity_api.create_user(new_user)
            test_users.append(new_user)
        positive_user = test_users[0]
        negative_user = test_users[1]

        for x in range(0, USER_COUNT):
            group_refs = self.identity_api.list_groups_for_user(
                test_users[x]['id'])
            self.assertEqual(0, len(group_refs))

        for x in range(0, GROUP_COUNT):
            new_group = {'domain_id': domain['id'],
                         'name': uuid.uuid4().hex}
            new_group = self.identity_api.create_group(new_group)
            test_groups.append(new_group)

            group_refs = self.identity_api.list_groups_for_user(
                positive_user['id'])
            self.assertEqual(x, len(group_refs))

            self.identity_api.add_user_to_group(
                positive_user['id'],
                new_group['id'])
            group_refs = self.identity_api.list_groups_for_user(
                positive_user['id'])
            self.assertEqual(x + 1, len(group_refs))

            group_refs = self.identity_api.list_groups_for_user(
                negative_user['id'])
            self.assertEqual(0, len(group_refs))

        self.config_fixture.config(group='ldap', group_filter='(dn=xx)')
        self.reload_backends(CONF.identity.default_domain_id)
        group_refs = self.identity_api.list_groups_for_user(
            positive_user['id'])
        self.assertEqual(0, len(group_refs))
        group_refs = self.identity_api.list_groups_for_user(
            negative_user['id'])
        self.assertEqual(0, len(group_refs))

        self.config_fixture.config(group='ldap',
                                   group_filter='(objectclass=*)')
        self.reload_backends(CONF.identity.default_domain_id)
        group_refs = self.identity_api.list_groups_for_user(
            positive_user['id'])
        self.assertEqual(GROUP_COUNT, len(group_refs))
        group_refs = self.identity_api.list_groups_for_user(
            negative_user['id'])
        self.assertEqual(0, len(group_refs))

    def test_user_enable_attribute_mask(self):
        self.config_fixture.config(
            group='ldap',
            user_enabled_emulation=False,
            user_enabled_attribute='employeeType')
        super(LiveLDAPIdentity, self).test_user_enable_attribute_mask()

    def test_create_project_case_sensitivity(self):
        # The attribute used for the live LDAP tests is case insensitive.

        def call_super():
            (super(LiveLDAPIdentity, self).
                test_create_project_case_sensitivity())

        self.assertRaises(exception.Conflict, call_super)

    def test_create_user_case_sensitivity(self):
        # The attribute used for the live LDAP tests is case insensitive.

        def call_super():
            super(LiveLDAPIdentity, self).test_create_user_case_sensitivity()

        self.assertRaises(exception.Conflict, call_super)

    def test_project_update_missing_attrs_with_a_falsey_value(self):
        # The description attribute doesn't allow an empty value.

        def call_super():
            (super(LiveLDAPIdentity, self).
                test_project_update_missing_attrs_with_a_falsey_value())

        self.assertRaises(ldap.INVALID_SYNTAX, call_super)