808 lines
29 KiB
Python
808 lines
29 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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Nova authentication management
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"""
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import logging
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import os
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import shutil
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import string
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import sys
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import tempfile
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import uuid
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import zipfile
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from nova import crypto
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from nova import datastore
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from nova import exception
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from nova import flags
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from nova import objectstore # for flags
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from nova import utils
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from nova.auth import ldapdriver # for flags
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from nova.auth import signer
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FLAGS = flags.FLAGS
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# NOTE(vish): a user with one of these roles will be a superuser and
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# have access to all api commands
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flags.DEFINE_list('superuser_roles', ['cloudadmin'],
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'Roles that ignore rbac checking completely')
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# NOTE(vish): a user with one of these roles will have it for every
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# project, even if he or she is not a member of the project
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flags.DEFINE_list('global_roles', ['cloudadmin', 'itsec'],
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'Roles that apply to all projects')
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flags.DEFINE_bool('use_vpn', True, 'Support per-project vpns')
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flags.DEFINE_string('credentials_template',
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utils.abspath('auth/novarc.template'),
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'Template for creating users rc file')
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flags.DEFINE_string('vpn_client_template',
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utils.abspath('cloudpipe/client.ovpn.template'),
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'Template for creating users vpn file')
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flags.DEFINE_string('credential_key_file', 'pk.pem',
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'Filename of private key in credentials zip')
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flags.DEFINE_string('credential_cert_file', 'cert.pem',
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'Filename of certificate in credentials zip')
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flags.DEFINE_string('credential_rc_file', 'novarc',
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'Filename of rc in credentials zip')
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flags.DEFINE_integer('vpn_start_port', 1000,
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'Start port for the cloudpipe VPN servers')
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flags.DEFINE_integer('vpn_end_port', 2000,
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'End port for the cloudpipe VPN servers')
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flags.DEFINE_string('credential_cert_subject',
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'/C=US/ST=California/L=MountainView/O=AnsoLabs/'
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'OU=NovaDev/CN=%s-%s',
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'Subject for certificate for users')
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flags.DEFINE_string('vpn_ip', '127.0.0.1',
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'Public IP for the cloudpipe VPN servers')
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flags.DEFINE_string('auth_driver', 'nova.auth.ldapdriver.FakeLdapDriver',
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'Driver that auth manager uses')
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class AuthBase(object):
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"""Base class for objects relating to auth
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Objects derived from this class should be stupid data objects with
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an id member. They may optionally contain methods that delegate to
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AuthManager, but should not implement logic themselves.
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"""
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@classmethod
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def safe_id(cls, obj):
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"""Safe get object id
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This method will return the id of the object if the object
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is of this class, otherwise it will return the original object.
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This allows methods to accept objects or ids as paramaters.
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"""
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if isinstance(obj, cls):
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return obj.id
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else:
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return obj
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class User(AuthBase):
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"""Object representing a user"""
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def __init__(self, id, name, access, secret, admin):
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self.id = id
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self.name = name
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self.access = access
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self.secret = secret
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self.admin = admin
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def is_superuser(self):
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return AuthManager().is_superuser(self)
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def is_admin(self):
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return AuthManager().is_admin(self)
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def has_role(self, role):
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return AuthManager().has_role(self, role)
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def add_role(self, role):
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return AuthManager().add_role(self, role)
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def remove_role(self, role):
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return AuthManager().remove_role(self, role)
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def is_project_member(self, project):
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return AuthManager().is_project_member(self, project)
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def is_project_manager(self, project):
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return AuthManager().is_project_manager(self, project)
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def generate_key_pair(self, name):
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return AuthManager().generate_key_pair(self.id, name)
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def create_key_pair(self, name, public_key, fingerprint):
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return AuthManager().create_key_pair(self.id,
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name,
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public_key,
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fingerprint)
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def get_key_pair(self, name):
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return AuthManager().get_key_pair(self.id, name)
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def delete_key_pair(self, name):
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return AuthManager().delete_key_pair(self.id, name)
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def get_key_pairs(self):
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return AuthManager().get_key_pairs(self.id)
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def __repr__(self):
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return "User('%s', '%s', '%s', '%s', %s)" % (self.id,
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self.name,
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self.access,
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self.secret,
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self.admin)
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class KeyPair(AuthBase):
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"""Represents an ssh key returned from the datastore
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Even though this object is named KeyPair, only the public key and
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fingerprint is stored. The user's private key is not saved.
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"""
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def __init__(self, id, name, owner_id, public_key, fingerprint):
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self.id = id
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self.name = name
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self.owner_id = owner_id
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self.public_key = public_key
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self.fingerprint = fingerprint
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def __repr__(self):
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return "KeyPair('%s', '%s', '%s', '%s', '%s')" % (self.id,
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self.name,
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self.owner_id,
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self.public_key,
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self.fingerprint)
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class Project(AuthBase):
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"""Represents a Project returned from the datastore"""
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def __init__(self, id, name, project_manager_id, description, member_ids):
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self.id = id
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self.name = name
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self.project_manager_id = project_manager_id
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self.description = description
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self.member_ids = member_ids
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@property
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def project_manager(self):
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return AuthManager().get_user(self.project_manager_id)
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@property
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def vpn_ip(self):
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ip, port = AuthManager().get_project_vpn_data(self)
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return ip
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@property
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def vpn_port(self):
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ip, port = AuthManager().get_project_vpn_data(self)
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return port
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def has_manager(self, user):
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return AuthManager().is_project_manager(user, self)
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def has_member(self, user):
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return AuthManager().is_project_member(user, self)
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def add_role(self, user, role):
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return AuthManager().add_role(user, role, self)
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def remove_role(self, user, role):
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return AuthManager().remove_role(user, role, self)
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def has_role(self, user, role):
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return AuthManager().has_role(user, role, self)
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def get_credentials(self, user):
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return AuthManager().get_credentials(user, self)
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def __repr__(self):
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return "Project('%s', '%s', '%s', '%s', %s)" % (self.id,
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self.name,
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self.project_manager_id,
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self.description,
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self.member_ids)
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class NoMorePorts(exception.Error):
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pass
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class Vpn(datastore.BasicModel):
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"""Manages vpn ips and ports for projects"""
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def __init__(self, project_id):
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self.project_id = project_id
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super(Vpn, self).__init__()
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@property
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def identifier(self):
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"""Identifier used for key in redis"""
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return self.project_id
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@classmethod
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def create(cls, project_id):
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"""Creates a vpn for project
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This method finds a free ip and port and stores the associated
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values in the datastore.
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"""
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# TODO(vish): get list of vpn ips from redis
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port = cls.find_free_port_for_ip(FLAGS.vpn_ip)
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vpn = cls(project_id)
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# save ip for project
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vpn['project'] = project_id
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vpn['ip'] = FLAGS.vpn_ip
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vpn['port'] = port
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vpn.save()
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return vpn
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@classmethod
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def find_free_port_for_ip(cls, ip):
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"""Finds a free port for a given ip from the redis set"""
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# TODO(vish): these redis commands should be generalized and
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# placed into a base class. Conceptually, it is
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# similar to an association, but we are just
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# storing a set of values instead of keys that
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# should be turned into objects.
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redis = datastore.Redis.instance()
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key = 'ip:%s:ports' % ip
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# TODO(vish): these ports should be allocated through an admin
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# command instead of a flag
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if (not redis.exists(key) and
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not redis.exists(cls._redis_association_name('ip', ip))):
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for i in range(FLAGS.vpn_start_port, FLAGS.vpn_end_port + 1):
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redis.sadd(key, i)
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port = redis.spop(key)
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if not port:
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raise NoMorePorts()
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return port
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@classmethod
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def num_ports_for_ip(cls, ip):
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"""Calculates the number of free ports for a given ip"""
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return datastore.Redis.instance().scard('ip:%s:ports' % ip)
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@property
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def ip(self):
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"""The ip assigned to the project"""
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return self['ip']
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@property
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def port(self):
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"""The port assigned to the project"""
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return int(self['port'])
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def save(self):
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"""Saves the association to the given ip"""
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self.associate_with('ip', self.ip)
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super(Vpn, self).save()
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def destroy(self):
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"""Cleans up datastore and adds port back to pool"""
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self.unassociate_with('ip', self.ip)
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datastore.Redis.instance().sadd('ip:%s:ports' % self.ip, self.port)
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super(Vpn, self).destroy()
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class AuthManager(object):
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"""Manager Singleton for dealing with Users, Projects, and Keypairs
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Methods accept objects or ids.
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AuthManager uses a driver object to make requests to the data backend.
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See ldapdriver for reference.
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AuthManager also manages associated data related to Auth objects that
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need to be more accessible, such as vpn ips and ports.
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"""
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_instance=None
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def __new__(cls, *args, **kwargs):
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"""Returns the AuthManager singleton"""
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if not cls._instance:
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cls._instance = super(AuthManager, cls).__new__(
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cls, *args, **kwargs)
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return cls._instance
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def __init__(self, driver=None, *args, **kwargs):
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"""Inits the driver from parameter or flag
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__init__ is run every time AuthManager() is called, so we only
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reset the driver if it is not set or a new driver is specified.
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"""
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if driver or not getattr(self, 'driver', None):
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self.driver = utils.import_class(driver or FLAGS.auth_driver)
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def authenticate(self, access, signature, params, verb='GET',
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server_string='127.0.0.1:8773', path='/',
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check_type='ec2', headers=None):
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"""Authenticates AWS request using access key and signature
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If the project is not specified, attempts to authenticate to
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a project with the same name as the user. This way, older tools
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that have no project knowledge will still work.
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@type access: str
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@param access: Access key for user in the form "access:project".
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@type signature: str
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@param signature: Signature of the request.
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@type params: list of str
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@param params: Web paramaters used for the signature.
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@type verb: str
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@param verb: Web request verb ('GET' or 'POST').
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@type server_string: str
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@param server_string: Web request server string.
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@type path: str
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@param path: Web request path.
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@type check_type: str
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@param check_type: Type of signature to check. 'ec2' for EC2, 's3' for
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S3. Any other value will cause signature not to be
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checked.
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@type headers: list
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@param headers: HTTP headers passed with the request (only needed for
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s3 signature checks)
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@rtype: tuple (User, Project)
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@return: User and project that the request represents.
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"""
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# TODO(vish): check for valid timestamp
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(access_key, sep, project_id) = access.partition(':')
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logging.info('Looking up user: %r', access_key)
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user = self.get_user_from_access_key(access_key)
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logging.info('user: %r', user)
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if user == None:
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raise exception.NotFound('No user found for access key %s' %
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access_key)
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# NOTE(vish): if we stop using project name as id we need better
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# logic to find a default project for user
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if project_id is '':
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project_id = user.name
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project = self.get_project(project_id)
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if project == None:
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raise exception.NotFound('No project called %s could be found' %
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project_id)
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if not self.is_admin(user) and not self.is_project_member(user,
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project):
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raise exception.NotFound('User %s is not a member of project %s' %
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(user.id, project.id))
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if check_type == 's3':
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expected_signature = signer.Signer(user.secret.encode()).s3_authorization(headers, verb, path)
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logging.debug('user.secret: %s', user.secret)
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logging.debug('expected_signature: %s', expected_signature)
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logging.debug('signature: %s', signature)
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if signature != expected_signature:
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raise exception.NotAuthorized('Signature does not match')
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elif check_type == 'ec2':
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# NOTE(vish): hmac can't handle unicode, so encode ensures that
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# secret isn't unicode
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expected_signature = signer.Signer(user.secret.encode()).generate(
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params, verb, server_string, path)
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logging.debug('user.secret: %s', user.secret)
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logging.debug('expected_signature: %s', expected_signature)
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logging.debug('signature: %s', signature)
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if signature != expected_signature:
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raise exception.NotAuthorized('Signature does not match')
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return (user, project)
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def is_superuser(self, user):
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"""Checks for superuser status, allowing user to bypass rbac
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@type user: User or uid
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@param user: User to check.
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@rtype: bool
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@return: True for superuser.
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"""
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if not isinstance(user, User):
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user = self.get_user(user)
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# NOTE(vish): admin flag on user represents superuser
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if user.admin:
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return True
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for role in FLAGS.superuser_roles:
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if self.has_role(user, role):
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return True
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def is_admin(self, user):
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"""Checks for admin status, allowing user to access all projects
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@type user: User or uid
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@param user: User to check.
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@rtype: bool
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@return: True for admin.
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"""
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if not isinstance(user, User):
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user = self.get_user(user)
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if self.is_superuser(user):
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return True
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for role in FLAGS.global_roles:
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if self.has_role(user, role):
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return True
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def has_role(self, user, role, project=None):
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"""Checks existence of role for user
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If project is not specified, checks for a global role. If project
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is specified, checks for the union of the global role and the
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project role.
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Role 'projectmanager' only works for projects and simply checks to
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see if the user is the project_manager of the specified project. It
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is the same as calling is_project_manager(user, project).
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@type user: User or uid
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@param user: User to check.
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@type role: str
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@param role: Role to check.
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@type project: Project or project_id
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@param project: Project in which to look for local role.
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@rtype: bool
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@return: True if the user has the role.
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"""
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with self.driver() as drv:
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if role == 'projectmanager':
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if not project:
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raise exception.Error("Must specify project")
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return self.is_project_manager(user, project)
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global_role = drv.has_role(User.safe_id(user),
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role,
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None)
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if not global_role:
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return global_role
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if not project or role in FLAGS.global_roles:
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return global_role
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return drv.has_role(User.safe_id(user),
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role,
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Project.safe_id(project))
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def add_role(self, user, role, project=None):
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"""Adds role for user
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If project is not specified, adds a global role. If project
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is specified, adds a local role.
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The 'projectmanager' role is special and can't be added or removed.
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@type user: User or uid
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@param user: User to which to add role.
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@type role: str
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@param role: Role to add.
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@type project: Project or project_id
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@param project: Project in which to add local role.
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"""
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with self.driver() as drv:
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drv.add_role(User.safe_id(user), role, Project.safe_id(project))
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def remove_role(self, user, role, project=None):
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"""Removes role for user
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If project is not specified, removes a global role. If project
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is specified, removes a local role.
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The 'projectmanager' role is special and can't be added or removed.
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@type user: User or uid
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@param user: User from which to remove role.
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@type role: str
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@param role: Role to remove.
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@type project: Project or project_id
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@param project: Project in which to remove local role.
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"""
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with self.driver() as drv:
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drv.remove_role(User.safe_id(user), role, Project.safe_id(project))
|
|
|
|
def get_project(self, pid):
|
|
"""Get project object by id"""
|
|
with self.driver() as drv:
|
|
project_dict = drv.get_project(pid)
|
|
if project_dict:
|
|
return Project(**project_dict)
|
|
|
|
def get_projects(self, user=None):
|
|
"""Retrieves list of projects, optionally filtered by user"""
|
|
with self.driver() as drv:
|
|
project_list = drv.get_projects(User.safe_id(user))
|
|
if not project_list:
|
|
return []
|
|
return [Project(**project_dict) for project_dict in project_list]
|
|
|
|
def create_project(self, name, manager_user,
|
|
description=None, member_users=None):
|
|
"""Create a project
|
|
|
|
@type name: str
|
|
@param name: Name of the project to create. The name will also be
|
|
used as the project id.
|
|
|
|
@type manager_user: User or uid
|
|
@param manager_user: This user will be the project manager.
|
|
|
|
@type description: str
|
|
@param project: Description of the project. If no description is
|
|
specified, the name of the project will be used.
|
|
|
|
@type member_users: list of User or uid
|
|
@param: Initial project members. The project manager will always be
|
|
added as a member, even if he isn't specified in this list.
|
|
|
|
@rtype: Project
|
|
@return: The new project.
|
|
"""
|
|
if member_users:
|
|
member_users = [User.safe_id(u) for u in member_users]
|
|
with self.driver() as drv:
|
|
project_dict = drv.create_project(name,
|
|
User.safe_id(manager_user),
|
|
description,
|
|
member_users)
|
|
if project_dict:
|
|
if FLAGS.use_vpn:
|
|
Vpn.create(project_dict['id'])
|
|
return Project(**project_dict)
|
|
|
|
def add_to_project(self, user, project):
|
|
"""Add user to project"""
|
|
with self.driver() as drv:
|
|
return drv.add_to_project(User.safe_id(user),
|
|
Project.safe_id(project))
|
|
|
|
def is_project_manager(self, user, project):
|
|
"""Checks if user is project manager"""
|
|
if not isinstance(project, Project):
|
|
project = self.get_project(project)
|
|
return User.safe_id(user) == project.project_manager_id
|
|
|
|
def is_project_member(self, user, project):
|
|
"""Checks to see if user is a member of project"""
|
|
if not isinstance(project, Project):
|
|
project = self.get_project(project)
|
|
return User.safe_id(user) in project.member_ids
|
|
|
|
def remove_from_project(self, user, project):
|
|
"""Removes a user from a project"""
|
|
with self.driver() as drv:
|
|
return drv.remove_from_project(User.safe_id(user),
|
|
Project.safe_id(project))
|
|
|
|
def get_project_vpn_data(self, project):
|
|
"""Gets vpn ip and port for project
|
|
|
|
@type project: Project or project_id
|
|
@param project: Project from which to get associated vpn data
|
|
|
|
@rvalue: tuple of (str, str)
|
|
@return: A tuple containing (ip, port) or None, None if vpn has
|
|
not been allocated for user.
|
|
"""
|
|
vpn = Vpn.lookup(Project.safe_id(project))
|
|
if not vpn:
|
|
return None, None
|
|
return (vpn.ip, vpn.port)
|
|
|
|
def delete_project(self, project):
|
|
"""Deletes a project"""
|
|
with self.driver() as drv:
|
|
return drv.delete_project(Project.safe_id(project))
|
|
|
|
def get_user(self, uid):
|
|
"""Retrieves a user by id"""
|
|
with self.driver() as drv:
|
|
user_dict = drv.get_user(uid)
|
|
if user_dict:
|
|
return User(**user_dict)
|
|
|
|
def get_user_from_access_key(self, access_key):
|
|
"""Retrieves a user by access key"""
|
|
with self.driver() as drv:
|
|
user_dict = drv.get_user_from_access_key(access_key)
|
|
if user_dict:
|
|
return User(**user_dict)
|
|
|
|
def get_users(self):
|
|
"""Retrieves a list of all users"""
|
|
with self.driver() as drv:
|
|
user_list = drv.get_users()
|
|
if not user_list:
|
|
return []
|
|
return [User(**user_dict) for user_dict in user_list]
|
|
|
|
def create_user(self, name, access=None, secret=None, admin=False):
|
|
"""Creates a user
|
|
|
|
@type name: str
|
|
@param name: Name of the user to create.
|
|
|
|
@type access: str
|
|
@param access: Access Key (defaults to a random uuid)
|
|
|
|
@type secret: str
|
|
@param secret: Secret Key (defaults to a random uuid)
|
|
|
|
@type admin: bool
|
|
@param admin: Whether to set the admin flag. The admin flag gives
|
|
superuser status regardless of roles specifed for the user.
|
|
|
|
@type create_project: bool
|
|
@param: Whether to create a project for the user with the same name.
|
|
|
|
@rtype: User
|
|
@return: The new user.
|
|
"""
|
|
if access == None: access = str(uuid.uuid4())
|
|
if secret == None: secret = str(uuid.uuid4())
|
|
with self.driver() as drv:
|
|
user_dict = drv.create_user(name, access, secret, admin)
|
|
if user_dict:
|
|
return User(**user_dict)
|
|
|
|
def delete_user(self, user):
|
|
"""Deletes a user"""
|
|
with self.driver() as drv:
|
|
drv.delete_user(User.safe_id(user))
|
|
|
|
def generate_key_pair(self, user, key_name):
|
|
"""Generates a key pair for a user
|
|
|
|
Generates a public and private key, stores the public key using the
|
|
key_name, and returns the private key and fingerprint.
|
|
|
|
@type user: User or uid
|
|
@param user: User for which to create key pair.
|
|
|
|
@type key_name: str
|
|
@param key_name: Name to use for the generated KeyPair.
|
|
|
|
@rtype: tuple (private_key, fingerprint)
|
|
@return: A tuple containing the private_key and fingerprint.
|
|
"""
|
|
# NOTE(vish): generating key pair is slow so check for legal
|
|
# creation before creating keypair
|
|
uid = User.safe_id(user)
|
|
with self.driver() as drv:
|
|
if not drv.get_user(uid):
|
|
raise exception.NotFound("User %s doesn't exist" % user)
|
|
if drv.get_key_pair(uid, key_name):
|
|
raise exception.Duplicate("The keypair %s already exists"
|
|
% key_name)
|
|
private_key, public_key, fingerprint = crypto.generate_key_pair()
|
|
self.create_key_pair(uid, key_name, public_key, fingerprint)
|
|
return private_key, fingerprint
|
|
|
|
def create_key_pair(self, user, key_name, public_key, fingerprint):
|
|
"""Creates a key pair for user"""
|
|
with self.driver() as drv:
|
|
kp_dict = drv.create_key_pair(User.safe_id(user),
|
|
key_name,
|
|
public_key,
|
|
fingerprint)
|
|
if kp_dict:
|
|
return KeyPair(**kp_dict)
|
|
|
|
def get_key_pair(self, user, key_name):
|
|
"""Retrieves a key pair for user"""
|
|
with self.driver() as drv:
|
|
kp_dict = drv.get_key_pair(User.safe_id(user), key_name)
|
|
if kp_dict:
|
|
return KeyPair(**kp_dict)
|
|
|
|
def get_key_pairs(self, user):
|
|
"""Retrieves all key pairs for user"""
|
|
with self.driver() as drv:
|
|
kp_list = drv.get_key_pairs(User.safe_id(user))
|
|
if not kp_list:
|
|
return []
|
|
return [KeyPair(**kp_dict) for kp_dict in kp_list]
|
|
|
|
def delete_key_pair(self, user, key_name):
|
|
"""Deletes a key pair for user"""
|
|
with self.driver() as drv:
|
|
drv.delete_key_pair(User.safe_id(user), key_name)
|
|
|
|
def get_credentials(self, user, project=None):
|
|
"""Get credential zip for user in project"""
|
|
if not isinstance(user, User):
|
|
user = self.get_user(user)
|
|
if project is None:
|
|
project = user.id
|
|
pid = Project.safe_id(project)
|
|
rc = self.__generate_rc(user.access, user.secret, pid)
|
|
private_key, signed_cert = self._generate_x509_cert(user.id, pid)
|
|
|
|
vpn = Vpn.lookup(pid)
|
|
if not vpn:
|
|
raise exception.Error("No vpn data allocated for project %s" %
|
|
project.name)
|
|
configfile = open(FLAGS.vpn_client_template,"r")
|
|
s = string.Template(configfile.read())
|
|
configfile.close()
|
|
config = s.substitute(keyfile=FLAGS.credential_key_file,
|
|
certfile=FLAGS.credential_cert_file,
|
|
ip=vpn.ip,
|
|
port=vpn.port)
|
|
|
|
tmpdir = tempfile.mkdtemp()
|
|
zf = os.path.join(tmpdir, "temp.zip")
|
|
zippy = zipfile.ZipFile(zf, 'w')
|
|
zippy.writestr(FLAGS.credential_rc_file, rc)
|
|
zippy.writestr(FLAGS.credential_key_file, private_key)
|
|
zippy.writestr(FLAGS.credential_cert_file, signed_cert)
|
|
zippy.writestr("nebula-client.conf", config)
|
|
zippy.writestr(FLAGS.ca_file, crypto.fetch_ca(user.id))
|
|
zippy.close()
|
|
with open(zf, 'rb') as f:
|
|
buffer = f.read()
|
|
|
|
shutil.rmtree(tmpdir)
|
|
return buffer
|
|
|
|
def __generate_rc(self, access, secret, pid):
|
|
"""Generate rc file for user"""
|
|
rc = open(FLAGS.credentials_template).read()
|
|
rc = rc % { 'access': access,
|
|
'project': pid,
|
|
'secret': secret,
|
|
'ec2': FLAGS.ec2_url,
|
|
's3': 'http://%s:%s' % (FLAGS.s3_host, FLAGS.s3_port),
|
|
'nova': FLAGS.ca_file,
|
|
'cert': FLAGS.credential_cert_file,
|
|
'key': FLAGS.credential_key_file,
|
|
}
|
|
return rc
|
|
|
|
def _generate_x509_cert(self, uid, pid):
|
|
"""Generate x509 cert for user"""
|
|
(private_key, csr) = crypto.generate_x509_cert(
|
|
self.__cert_subject(uid))
|
|
# TODO(joshua): This should be async call back to the cloud controller
|
|
signed_cert = crypto.sign_csr(csr, pid)
|
|
return (private_key, signed_cert)
|
|
|
|
def __cert_subject(self, uid):
|
|
"""Helper to generate cert subject"""
|
|
return FLAGS.credential_cert_subject % (uid, utils.isotime())
|