40cc7b8fdb
If the metadata provider can update the password, the SetUserPassword plugin will run at every boot and will set the new password only if it exists. Change-Id: Ifde8893da7cc2f4452b6cae5cf28b8000a0847ee
135 lines
5.3 KiB
Python
135 lines
5.3 KiB
Python
# Copyright 2013 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import base64
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from oslo.config import cfg
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from cloudbaseinit.openstack.common import log as logging
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from cloudbaseinit.osutils import factory as osutils_factory
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from cloudbaseinit.plugins.common import base
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from cloudbaseinit.plugins.common import constants
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from cloudbaseinit.utils import crypt
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opts = [
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cfg.BoolOpt('inject_user_password', default=True, help='Set the password '
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'provided in the configuration. If False or no password is '
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'provided, a random one will be set'),
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]
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CONF = cfg.CONF
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CONF.register_opts(opts)
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CONF.import_opt('username', 'cloudbaseinit.plugins.common.createuser')
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LOG = logging.getLogger(__name__)
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class SetUserPasswordPlugin(base.BasePlugin):
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def _encrypt_password(self, ssh_pub_key, password):
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cm = crypt.CryptManager()
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with cm.load_ssh_rsa_public_key(ssh_pub_key) as rsa:
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enc_password = rsa.public_encrypt(password.encode())
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return base64.b64encode(enc_password)
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def _get_ssh_public_key(self, service):
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public_keys = service.get_public_keys()
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if public_keys:
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return list(public_keys)[0]
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def _get_password(self, service, osutils, shared_data):
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if CONF.inject_user_password:
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password = service.get_admin_password()
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else:
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password = None
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if password:
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LOG.warn('Using admin_pass metadata user password. Consider '
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'changing it as soon as possible')
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else:
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password = shared_data.get(constants.SHARED_DATA_PASSWORD)
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return password
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def _set_metadata_password(self, password, service):
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if service.is_password_set:
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LOG.debug('User\'s password already set in the instance metadata '
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'and it cannot be updated in the instance metadata')
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return True
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else:
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ssh_pub_key = self._get_ssh_public_key(service)
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if ssh_pub_key:
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enc_password_b64 = self._encrypt_password(ssh_pub_key,
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password)
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return service.post_password(enc_password_b64)
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else:
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LOG.info('No SSH public key available for password encryption')
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return True
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def _set_password(self, service, osutils, user_name, shared_data):
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"""Change the password for the received username if it is required.
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The used password can be the one received from the metadata provider,
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if it does exist, or a random one will be generated.
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.. notes:
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This method has a different behaviour depending on the value of
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:meth:`~can_update password` if this is True the password will
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be set only if the :meth:`~is_password_changed` is also True.
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"""
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if service.can_update_password and not service.is_password_changed():
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LOG.info('Updating password is not required.')
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return None
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password = self._get_password(service, osutils, shared_data)
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if not password:
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LOG.debug('Generating a random user password')
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maximum_length = osutils.get_maximum_password_length()
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password = osutils.generate_random_password(
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maximum_length)
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osutils.set_user_password(user_name, password)
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return password
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def execute(self, service, shared_data):
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# TODO(alexpilotti): The username selection logic must be set in the
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# CreateUserPlugin instead if using CONF.username
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user_name = shared_data.get(constants.SHARED_DATA_USERNAME,
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CONF.username)
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osutils = osutils_factory.get_os_utils()
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if osutils.user_exists(user_name):
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password = self._set_password(service, osutils,
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user_name, shared_data)
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if password:
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LOG.info('Password succesfully updated for user %s' %
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user_name)
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# TODO(alexpilotti): encrypt with DPAPI
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shared_data[constants.SHARED_DATA_PASSWORD] = password
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if not service.can_post_password:
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LOG.info('Cannot set the password in the metadata as it '
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'is not supported by this service')
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else:
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self._set_metadata_password(password, service)
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if service.can_update_password:
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# If the metadata provider can update the password, the plugin
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# must run at every boot in order to update the password if
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# it was changed.
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return (base.PLUGIN_EXECUTE_ON_NEXT_BOOT, False)
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else:
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return (base.PLUGIN_EXECUTION_DONE, False)
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