714 lines
26 KiB
Python
714 lines
26 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 # pylint: disable-msg=W0402
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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 context
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from nova import crypto
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from nova import db
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from nova import exception
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from nova import flags
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from nova import utils
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from nova.auth import signer
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FLAGS = flags.FLAGS
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flags.DEFINE_list('allowed_roles',
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['cloudadmin', 'itsec', 'sysadmin', 'netadmin', 'developer'],
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'Allowed roles for project')
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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 authorization 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_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_vpn_file', 'nova-vpn.conf',
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'Filename of certificate in credentials zip')
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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', '%src',
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'Filename of rc in credentials zip, %s will be '
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'replaced by name of the region (nova by default)')
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flags.DEFINE_string('auth_driver', 'nova.auth.dbdriver.DbDriver',
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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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"""Safely 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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AuthBase.__init__(self)
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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 __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 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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AuthBase.__init__(self)
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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)" % \
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(self.id, self.name, self.project_manager_id, self.description,
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self.member_ids)
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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 or ('new' in kwargs and kwargs['new']):
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cls._instance = super(AuthManager, cls).__new__(cls)
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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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self.network_manager = utils.import_object(FLAGS.network_manager)
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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 == '':
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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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sign = signer.Signer(user.secret.encode())
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expected_signature = sign.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 get_access_key(self, user, project):
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"""Get an access key that includes user and project"""
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if not isinstance(user, User):
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user = self.get_user(user)
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return "%s:%s" % (user.access, Project.safe_id(project))
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def is_superuser(self, user):
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"""Checks for superuser status, allowing user to bypass authorization
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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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if role not in FLAGS.allowed_roles:
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raise exception.NotFound(_("The %s role can not be found") % role)
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if project is not None and role in FLAGS.global_roles:
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raise exception.NotFound(_("The %s role is global only") % role)
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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))
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@staticmethod
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def get_roles(project_roles=True):
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"""Get list of allowed roles"""
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if project_roles:
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return list(set(FLAGS.allowed_roles) - set(FLAGS.global_roles))
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else:
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return FLAGS.allowed_roles
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def get_user_roles(self, user, project=None):
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"""Get user global or per-project roles"""
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with self.driver() as drv:
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return drv.get_user_roles(User.safe_id(user),
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Project.safe_id(project))
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def get_project(self, pid):
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"""Get project object by id"""
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with self.driver() as drv:
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project_dict = drv.get_project(pid)
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if project_dict:
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return Project(**project_dict)
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def get_projects(self, user=None):
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"""Retrieves list of projects, optionally filtered by user"""
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with self.driver() as drv:
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project_list = drv.get_projects(User.safe_id(user))
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if not project_list:
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return []
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return [Project(**project_dict) for project_dict in project_list]
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def create_project(self, name, manager_user, description=None,
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member_users=None):
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"""Create a project
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@type name: str
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@param name: Name of the project to create. The name will also be
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used as the project id.
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@type manager_user: User or uid
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@param manager_user: This user will be the project manager.
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@type description: str
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@param project: Description of the project. If no description is
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specified, the name of the project will be used.
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@type member_users: list of User or uid
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@param: Initial project members. The project manager will always be
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added as a member, even if he isn't specified in this list.
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@rtype: Project
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@return: The new project.
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"""
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if member_users:
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member_users = [User.safe_id(u) for u in member_users]
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with self.driver() as drv:
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project_dict = drv.create_project(name,
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User.safe_id(manager_user),
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description,
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member_users)
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if project_dict:
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project = Project(**project_dict)
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return project
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def modify_project(self, project, manager_user=None, description=None):
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"""Modify a project
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@type name: Project or project_id
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@param project: The project to modify.
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@type manager_user: User or uid
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@param manager_user: This user will be the new project manager.
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@type description: str
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@param project: This will be the new description of the project.
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"""
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if manager_user:
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manager_user = User.safe_id(manager_user)
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with self.driver() as drv:
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drv.modify_project(Project.safe_id(project),
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manager_user,
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description)
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def add_to_project(self, user, project):
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"""Add user to project"""
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with self.driver() as drv:
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return drv.add_to_project(User.safe_id(user),
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Project.safe_id(project))
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def is_project_manager(self, user, project):
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"""Checks if user is project manager"""
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if not isinstance(project, Project):
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project = self.get_project(project)
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return User.safe_id(user) == project.project_manager_id
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def is_project_member(self, user, project):
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"""Checks to see if user is a member of project"""
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if not isinstance(project, Project):
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project = self.get_project(project)
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return User.safe_id(user) in project.member_ids
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def remove_from_project(self, user, project):
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"""Removes a user from a project"""
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with self.driver() as drv:
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return drv.remove_from_project(User.safe_id(user),
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Project.safe_id(project))
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@staticmethod
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def get_project_vpn_data(project):
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"""Gets vpn ip and port for project
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@type project: Project or project_id
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@param project: Project from which to get associated vpn data
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@rvalue: tuple of (str, str)
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@return: A tuple containing (ip, port) or None, None if vpn has
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not been allocated for user.
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"""
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network_ref = db.project_get_network(context.get_admin_context(),
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Project.safe_id(project), False)
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if not network_ref:
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return (None, None)
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return (network_ref['vpn_public_address'],
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network_ref['vpn_public_port'])
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def delete_project(self, project):
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"""Deletes a project"""
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with self.driver() as drv:
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drv.delete_project(Project.safe_id(project))
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def get_user(self, uid):
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"""Retrieves a user by id"""
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with self.driver() as drv:
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user_dict = drv.get_user(uid)
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if user_dict:
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return User(**user_dict)
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def get_user_from_access_key(self, access_key):
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"""Retrieves a user by access key"""
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with self.driver() as drv:
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user_dict = drv.get_user_from_access_key(access_key)
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if user_dict:
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return User(**user_dict)
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|
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def get_users(self):
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"""Retrieves a list of all users"""
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with self.driver() as drv:
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user_list = drv.get_users()
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if not user_list:
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return []
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return [User(**user_dict) for user_dict in user_list]
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def create_user(self, name, access=None, secret=None, admin=False):
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"""Creates a user
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|
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|
@type name: str
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@param name: Name of the user to create.
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|
|
|
@type access: str
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@param access: Access Key (defaults to a random uuid)
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|
|
|
@type secret: str
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|
@param secret: Secret Key (defaults to a random uuid)
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|
|
|
@type admin: bool
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|
@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
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@param: Whether to create a project for the user with the same name.
|
|
|
|
@rtype: User
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|
@return: The new user.
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|
"""
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if access == None:
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access = str(uuid.uuid4())
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if secret == None:
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secret = str(uuid.uuid4())
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with self.driver() as drv:
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user_dict = drv.create_user(name, access, secret, admin)
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if user_dict:
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return User(**user_dict)
|
|
|
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def delete_user(self, user):
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|
"""Deletes a user
|
|
|
|
Additionally deletes all users key_pairs"""
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|
uid = User.safe_id(user)
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db.key_pair_destroy_all_by_user(context.get_admin_context(),
|
|
uid)
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with self.driver() as drv:
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|
drv.delete_user(uid)
|
|
|
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def modify_user(self, user, access_key=None, secret_key=None, admin=None):
|
|
"""Modify credentials for a user"""
|
|
uid = User.safe_id(user)
|
|
with self.driver() as drv:
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|
drv.modify_user(uid, access_key, secret_key, admin)
|
|
|
|
@staticmethod
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|
def get_key_pairs(context):
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|
return db.key_pair_get_all_by_user(context.elevated(), context.user_id)
|
|
|
|
def get_credentials(self, user, project=None, use_dmz=True):
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|
"""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)
|
|
private_key, signed_cert = crypto.generate_x509_cert(user.id, pid)
|
|
|
|
tmpdir = tempfile.mkdtemp()
|
|
zf = os.path.join(tmpdir, "temp.zip")
|
|
zippy = zipfile.ZipFile(zf, 'w')
|
|
if use_dmz and FLAGS.region_list:
|
|
regions = {}
|
|
for item in FLAGS.region_list:
|
|
region, _sep, region_host = item.partition("=")
|
|
regions[region] = region_host
|
|
else:
|
|
regions = {'nova': FLAGS.cc_host}
|
|
for region, host in regions.iteritems():
|
|
rc = self.__generate_rc(user.access,
|
|
user.secret,
|
|
pid,
|
|
use_dmz,
|
|
host)
|
|
zippy.writestr(FLAGS.credential_rc_file % region, rc)
|
|
|
|
zippy.writestr(FLAGS.credential_key_file, private_key)
|
|
zippy.writestr(FLAGS.credential_cert_file, signed_cert)
|
|
|
|
(vpn_ip, vpn_port) = self.get_project_vpn_data(project)
|
|
if vpn_ip:
|
|
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)
|
|
zippy.writestr(FLAGS.credential_vpn_file, config)
|
|
else:
|
|
logging.warn(_("No vpn data for project %s"), pid)
|
|
|
|
zippy.writestr(FLAGS.ca_file, crypto.fetch_ca(pid))
|
|
zippy.close()
|
|
with open(zf, 'rb') as f:
|
|
read_buffer = f.read()
|
|
|
|
shutil.rmtree(tmpdir)
|
|
return read_buffer
|
|
|
|
def get_environment_rc(self, user, project=None, use_dmz=True):
|
|
"""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)
|
|
return self.__generate_rc(user.access, user.secret, pid, use_dmz)
|
|
|
|
@staticmethod
|
|
def __generate_rc(access, secret, pid, use_dmz=True, host=None):
|
|
"""Generate rc file for user"""
|
|
if use_dmz:
|
|
cc_host = FLAGS.cc_dmz
|
|
else:
|
|
cc_host = FLAGS.cc_host
|
|
# NOTE(vish): Always use the dmz since it is used from inside the
|
|
# instance
|
|
s3_host = FLAGS.s3_dmz
|
|
if host:
|
|
s3_host = host
|
|
cc_host = host
|
|
rc = open(FLAGS.credentials_template).read()
|
|
rc = rc % {'access': access,
|
|
'project': pid,
|
|
'secret': secret,
|
|
'ec2': '%s://%s:%s%s' % (FLAGS.ec2_prefix,
|
|
cc_host,
|
|
FLAGS.cc_port,
|
|
FLAGS.ec2_suffix),
|
|
's3': 'http://%s:%s' % (s3_host, FLAGS.s3_port),
|
|
'nova': FLAGS.ca_file,
|
|
'cert': FLAGS.credential_cert_file,
|
|
'key': FLAGS.credential_key_file}
|
|
return rc
|