470 lines
18 KiB
Python
470 lines
18 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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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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"""
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Auth driver for ldap
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It should be easy to create a replacement for this driver supporting
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other backends by creating another class that exposes the same
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public methods.
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"""
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import logging
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from nova import exception
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from nova import flags
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FLAGS = flags.FLAGS
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flags.DEFINE_string('ldap_url', 'ldap://localhost',
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'Point this at your ldap server')
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flags.DEFINE_string('ldap_password', 'changeme', 'LDAP password')
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flags.DEFINE_string('ldap_user_dn', 'cn=Manager,dc=example,dc=com',
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'DN of admin user')
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flags.DEFINE_string('ldap_user_unit', 'Users', 'OID for Users')
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flags.DEFINE_string('ldap_user_subtree', 'ou=Users,dc=example,dc=com',
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'OU for Users')
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flags.DEFINE_string('ldap_project_subtree', 'ou=Groups,dc=example,dc=com',
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'OU for Projects')
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flags.DEFINE_string('role_project_subtree', 'ou=Groups,dc=example,dc=com',
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'OU for Roles')
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# NOTE(vish): mapping with these flags is necessary because we're going
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# to tie in to an existing ldap schema
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flags.DEFINE_string('ldap_cloudadmin',
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'cn=cloudadmins,ou=Groups,dc=example,dc=com', 'cn for Cloud Admins')
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flags.DEFINE_string('ldap_itsec',
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'cn=itsec,ou=Groups,dc=example,dc=com', 'cn for ItSec')
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flags.DEFINE_string('ldap_sysadmin',
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'cn=sysadmins,ou=Groups,dc=example,dc=com', 'cn for Sysadmins')
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flags.DEFINE_string('ldap_netadmin',
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'cn=netadmins,ou=Groups,dc=example,dc=com', 'cn for NetAdmins')
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flags.DEFINE_string('ldap_developer',
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'cn=developers,ou=Groups,dc=example,dc=com', 'cn for Developers')
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class AuthDriver(object):
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"""Ldap Auth driver
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Defines enter and exit and therefore supports the with/as syntax.
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"""
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def __init__(self):
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"""Imports the LDAP module"""
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self.ldap = __import__('ldap')
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def __enter__(self):
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"""Creates the connection to LDAP"""
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self.conn = self.ldap.initialize(FLAGS.ldap_url)
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self.conn.simple_bind_s(FLAGS.ldap_user_dn, FLAGS.ldap_password)
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return self
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def __exit__(self, type, value, traceback):
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"""Destroys the connection to LDAP"""
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self.conn.unbind_s()
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return False
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def get_user(self, uid):
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"""Retrieve user by id"""
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attr = self.__find_object(self.__uid_to_dn(uid),
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'(objectclass=novaUser)')
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return self.__to_user(attr)
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def get_user_from_access_key(self, access):
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"""Retrieve user by access key"""
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query = '(accessKey=%s)' % access
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dn = FLAGS.ldap_user_subtree
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return self.__to_user(self.__find_object(dn, query))
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def get_key_pair(self, uid, key_name):
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"""Retrieve key pair by uid and key name"""
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dn = 'cn=%s,%s' % (key_name,
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self.__uid_to_dn(uid))
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attr = self.__find_object(dn, '(objectclass=novaKeyPair)')
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return self.__to_key_pair(uid, attr)
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def get_project(self, pid):
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"""Retrieve project by id"""
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dn = 'cn=%s,%s' % (pid,
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FLAGS.ldap_project_subtree)
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attr = self.__find_object(dn, '(objectclass=novaProject)')
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return self.__to_project(attr)
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def get_users(self):
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"""Retrieve list of users"""
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attrs = self.__find_objects(FLAGS.ldap_user_subtree,
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'(objectclass=novaUser)')
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return [self.__to_user(attr) for attr in attrs]
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def get_key_pairs(self, uid):
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"""Retrieve list of key pairs"""
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attrs = self.__find_objects(self.__uid_to_dn(uid),
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'(objectclass=novaKeyPair)')
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return [self.__to_key_pair(uid, attr) for attr in attrs]
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def get_projects(self):
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"""Retrieve list of projects"""
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attrs = self.__find_objects(FLAGS.ldap_project_subtree,
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'(objectclass=novaProject)')
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return [self.__to_project(attr) for attr in attrs]
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def create_user(self, name, access_key, secret_key, is_admin):
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"""Create a user"""
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if self.__user_exists(name):
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raise exception.Duplicate("LDAP user %s already exists" % name)
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attr = [
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('objectclass', ['person',
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'organizationalPerson',
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'inetOrgPerson',
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'novaUser']),
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('ou', [FLAGS.ldap_user_unit]),
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('uid', [name]),
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('sn', [name]),
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('cn', [name]),
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('secretKey', [secret_key]),
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('accessKey', [access_key]),
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('isAdmin', [str(is_admin).upper()]),
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]
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self.conn.add_s(self.__uid_to_dn(name), attr)
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return self.__to_user(dict(attr))
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def create_key_pair(self, uid, key_name, public_key, fingerprint):
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"""Create a key pair"""
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# TODO(vish): possibly refactor this to store keys in their own ou
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# and put dn reference in the user object
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attr = [
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('objectclass', ['novaKeyPair']),
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('cn', [key_name]),
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('sshPublicKey', [public_key]),
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('keyFingerprint', [fingerprint]),
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]
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self.conn.add_s('cn=%s,%s' % (key_name,
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self.__uid_to_dn(uid)),
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attr)
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return self.__to_key_pair(uid, dict(attr))
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def create_project(self, name, manager_uid,
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description=None, member_uids=None):
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"""Create a project"""
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if self.__project_exists(name):
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raise exception.Duplicate("Project can't be created because "
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"project %s already exists" % name)
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if not self.__user_exists(manager_uid):
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raise exception.NotFound("Project can't be created because "
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"manager %s doesn't exist" % manager_uid)
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manager_dn = self.__uid_to_dn(manager_uid)
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# description is a required attribute
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if description is None:
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description = name
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members = []
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if member_uids != None:
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for member_uid in member_uids:
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if not self.__user_exists(member_uid):
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raise exception.NotFound("Project can't be created "
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"because user %s doesn't exist" % member_uid)
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members.append(self.__uid_to_dn(member_uid))
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# always add the manager as a member because members is required
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if not manager_dn in members:
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members.append(manager_dn)
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attr = [
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('objectclass', ['novaProject']),
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('cn', [name]),
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('description', [description]),
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('projectManager', [manager_dn]),
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('member', members)
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]
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self.conn.add_s('cn=%s,%s' % (name, FLAGS.ldap_project_subtree), attr)
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return self.__to_project(dict(attr))
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def add_to_project(self, uid, project_id):
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"""Add user to project"""
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dn = 'cn=%s,%s' % (project_id, FLAGS.ldap_project_subtree)
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return self.__add_to_group(uid, dn)
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def remove_from_project(self, uid, project_id):
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"""Remove user from project"""
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dn = 'cn=%s,%s' % (project_id, FLAGS.ldap_project_subtree)
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return self.__remove_from_group(uid, dn)
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def is_in_project(self, uid, project_id):
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"""Check if user is in project"""
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dn = 'cn=%s,%s' % (project_id, FLAGS.ldap_project_subtree)
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return self.__is_in_group(uid, dn)
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def has_role(self, uid, role, project_id=None):
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"""Check if user has role
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If project is specified, it checks for local role, otherwise it
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checks for global role
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"""
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role_dn = self.__role_to_dn(role, project_id)
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return self.__is_in_group(uid, role_dn)
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def add_role(self, uid, role, project_id=None):
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"""Add role for user (or user and project)"""
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role_dn = self.__role_to_dn(role, project_id)
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if not self.__group_exists(role_dn):
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# create the role if it doesn't exist
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description = '%s role for %s' % (role, project_id)
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self.__create_group(role_dn, role, uid, description)
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else:
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return self.__add_to_group(uid, role_dn)
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def remove_role(self, uid, role, project_id=None):
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"""Remove role for user (or user and project)"""
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role_dn = self.__role_to_dn(role, project_id)
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return self.__remove_from_group(uid, role_dn)
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def delete_user(self, uid):
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"""Delete a user"""
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if not self.__user_exists(uid):
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raise exception.NotFound("User %s doesn't exist" % uid)
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self.__delete_key_pairs(uid)
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self.__remove_from_all(uid)
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self.conn.delete_s('uid=%s,%s' % (uid,
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FLAGS.ldap_user_subtree))
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def delete_key_pair(self, uid, key_name):
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"""Delete a key pair"""
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if not self.__key_pair_exists(uid, key_name):
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raise exception.NotFound("Key Pair %s doesn't exist for user %s" %
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(key_name, uid))
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self.conn.delete_s('cn=%s,uid=%s,%s' % (key_name, uid,
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FLAGS.ldap_user_subtree))
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def delete_project(self, name):
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"""Delete a project"""
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project_dn = 'cn=%s,%s' % (name, FLAGS.ldap_project_subtree)
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self.__delete_roles(project_dn)
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self.__delete_group(project_dn)
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def __user_exists(self, name):
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"""Check if user exists"""
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return self.get_user(name) != None
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def __key_pair_exists(self, uid, key_name):
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"""Check if key pair exists"""
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return self.get_user(uid) != None
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return self.get_key_pair(uid, key_name) != None
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def __project_exists(self, name):
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"""Check if project exists"""
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return self.get_project(name) != None
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def __find_object(self, dn, query = None):
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"""Find an object by dn and query"""
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objects = self.__find_objects(dn, query)
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if len(objects) == 0:
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return None
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return objects[0]
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def __find_dns(self, dn, query=None):
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"""Find dns by query"""
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try:
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res = self.conn.search_s(dn, self.ldap.SCOPE_SUBTREE, query)
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except self.ldap.NO_SUCH_OBJECT:
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return []
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# just return the DNs
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return [dn for dn, attributes in res]
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def __find_objects(self, dn, query = None):
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"""Find objects by query"""
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try:
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res = self.conn.search_s(dn, self.ldap.SCOPE_SUBTREE, query)
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except self.ldap.NO_SUCH_OBJECT:
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return []
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# just return the attributes
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return [attributes for dn, attributes in res]
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def __find_role_dns(self, tree):
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"""Find dns of role objects in given tree"""
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return self.__find_dns(tree,
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'(&(objectclass=groupOfNames)(!(objectclass=novaProject)))')
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def __find_group_dns_with_member(self, tree, uid):
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"""Find dns of group objects in a given tree that contain member"""
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dns = self.__find_dns(tree,
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'(&(objectclass=groupOfNames)(member=%s))' %
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self.__uid_to_dn(uid))
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return dns
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def __group_exists(self, dn):
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"""Check if group exists"""
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return self.__find_object(dn, '(objectclass=groupOfNames)') != None
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def __delete_key_pairs(self, uid):
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"""Delete all key pairs for user"""
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keys = self.get_key_pairs(uid)
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if keys != None:
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for key in keys:
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self.delete_key_pair(uid, key['name'])
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def __role_to_dn(self, role, project_id=None):
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"""Convert role to corresponding dn"""
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if project_id == None:
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return FLAGS.__getitem__("ldap_%s" % role).value
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else:
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return 'cn=%s,cn=%s,%s' % (role,
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project_id,
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FLAGS.ldap_project_subtree)
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def __create_group(self, group_dn, name, uid,
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description, member_uids = None):
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"""Create a group"""
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if self.__group_exists(group_dn):
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raise exception.Duplicate("Group can't be created because "
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"group %s already exists" % name)
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members = []
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if member_uids != None:
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for member_uid in member_uids:
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if not self.__user_exists(member_uid):
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raise exception.NotFound("Group can't be created "
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"because user %s doesn't exist" % member_uid)
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members.append(self.__uid_to_dn(member_uid))
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dn = self.__uid_to_dn(uid)
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if not dn in members:
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members.append(dn)
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attr = [
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('objectclass', ['groupOfNames']),
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('cn', [name]),
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('description', [description]),
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('member', members)
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]
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self.conn.add_s(group_dn, attr)
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def __is_in_group(self, uid, group_dn):
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"""Check if user is in group"""
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if not self.__user_exists(uid):
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raise exception.NotFound("User %s can't be searched in group "
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"becuase the user doesn't exist" % (uid,))
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if not self.__group_exists(group_dn):
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return False
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res = self.__find_object(group_dn,
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'(member=%s)' % self.__uid_to_dn(uid))
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return res != None
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def __add_to_group(self, uid, group_dn):
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"""Add user to group"""
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if not self.__user_exists(uid):
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raise exception.NotFound("User %s can't be added to the group "
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"becuase the user doesn't exist" % (uid,))
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if not self.__group_exists(group_dn):
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raise exception.NotFound("The group at dn %s doesn't exist" %
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(group_dn,))
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if self.__is_in_group(uid, group_dn):
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raise exception.Duplicate("User %s is already a member of "
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"the group %s" % (uid, group_dn))
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attr = [
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(self.ldap.MOD_ADD, 'member', self.__uid_to_dn(uid))
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]
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self.conn.modify_s(group_dn, attr)
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def __remove_from_group(self, uid, group_dn):
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"""Remove user from group"""
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if not self.__group_exists(group_dn):
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raise exception.NotFound("The group at dn %s doesn't exist" %
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(group_dn,))
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if not self.__user_exists(uid):
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raise exception.NotFound("User %s can't be removed from the "
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"group because the user doesn't exist" % (uid,))
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if not self.__is_in_group(uid, group_dn):
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raise exception.NotFound("User %s is not a member of the group" %
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(uid,))
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self.__safe_remove_from_group(uid, group_dn)
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def __safe_remove_from_group(self, uid, group_dn):
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"""Remove user from group, deleting group if user is last member"""
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# FIXME(vish): what if deleted user is a project manager?
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attr = [(self.ldap.MOD_DELETE, 'member', self.__uid_to_dn(uid))]
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try:
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self.conn.modify_s(group_dn, attr)
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except self.ldap.OBJECT_CLASS_VIOLATION:
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logging.debug("Attempted to remove the last member of a group. "
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"Deleting the group at %s instead." % group_dn )
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self.__delete_group(group_dn)
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def __remove_from_all(self, uid):
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"""Remove user from all roles and projects"""
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if not self.__user_exists(uid):
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raise exception.NotFound("User %s can't be removed from all "
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"because the user doesn't exist" % (uid,))
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dn = self.__uid_to_dn(uid)
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role_dns = self.__find_group_dns_with_member(
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FLAGS.role_project_subtree, uid)
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for role_dn in role_dns:
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self.__safe_remove_from_group(uid, role_dn)
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project_dns = self.__find_group_dns_with_member(
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FLAGS.ldap_project_subtree, uid)
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for project_dn in project_dns:
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self.__safe_remove_from_group(uid, role_dn)
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def __delete_group(self, group_dn):
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"""Delete Group"""
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if not self.__group_exists(group_dn):
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raise exception.NotFound("Group at dn %s doesn't exist" % group_dn)
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self.conn.delete_s(group_dn)
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def __delete_roles(self, project_dn):
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"""Delete all roles for project"""
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for role_dn in self.__find_role_dns(project_dn):
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self.__delete_group(role_dn)
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def __to_user(self, attr):
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"""Convert ldap attributes to User object"""
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if attr == None:
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return None
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return {
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'id': attr['uid'][0],
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'name': attr['cn'][0],
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'access': attr['accessKey'][0],
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'secret': attr['secretKey'][0],
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'admin': (attr['isAdmin'][0] == 'TRUE')
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}
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def __to_key_pair(self, owner, attr):
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"""Convert ldap attributes to KeyPair object"""
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if attr == None:
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return None
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return {
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'id': attr['cn'][0],
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'name': attr['cn'][0],
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'owner_id': owner,
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'public_key': attr['sshPublicKey'][0],
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'fingerprint': attr['keyFingerprint'][0],
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}
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def __to_project(self, attr):
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"""Convert ldap attributes to Project object"""
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if attr == None:
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return None
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member_dns = attr.get('member', [])
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return {
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'id': attr['cn'][0],
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'name': attr['cn'][0],
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'project_manager_id': self.__dn_to_uid(attr['projectManager'][0]),
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'description': attr.get('description', [None])[0],
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'member_ids': [self.__dn_to_uid(x) for x in member_dns]
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}
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def __dn_to_uid(self, dn):
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"""Convert user dn to uid"""
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return dn.split(',')[0].split('=')[1]
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def __uid_to_dn(self, dn):
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"""Convert uid to dn"""
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return 'uid=%s,%s' % (dn, FLAGS.ldap_user_subtree)
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