345 lines
12 KiB
Python
345 lines
12 KiB
Python
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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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from heat.common import exception
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from heat.db import api as db_api
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from heat.engine import constraints
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from heat.engine import properties
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from heat.engine import resource
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from heat.openstack.common import log as logging
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import keystoneclient.exceptions as kc_exception
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logger = logging.getLogger(__name__)
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#
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# We are ignoring Groups as keystone does not support them.
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# For now support users and accesskeys,
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# We also now support a limited heat-native Policy implementation
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#
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class User(resource.Resource):
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PROPERTIES = (
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PATH, GROUPS, LOGIN_PROFILE, POLICIES,
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) = (
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'Path', 'Groups', 'LoginProfile', 'Policies',
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)
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_LOGIN_PROFILE_KEYS = (
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LOGIN_PROFILE_PASSWORD,
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) = (
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'Password',
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)
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properties_schema = {
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PATH: properties.Schema(
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properties.Schema.STRING,
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_('Not Implemented.')
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),
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GROUPS: properties.Schema(
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properties.Schema.LIST,
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_('Not Implemented.')
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),
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LOGIN_PROFILE: properties.Schema(
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properties.Schema.MAP,
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_('A login profile for the user.'),
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schema={
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LOGIN_PROFILE_PASSWORD: properties.Schema(
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properties.Schema.STRING
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),
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}
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),
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POLICIES: properties.Schema(
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properties.Schema.LIST,
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_('Access policies to apply to the user.')
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),
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}
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def _validate_policies(self, policies):
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for policy in (policies or []):
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# When we support AWS IAM style policies, we will have to accept
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# either a ref to an AWS::IAM::Policy defined in the stack, or
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# and embedded dict describing the policy directly, but for now
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# we only expect this list to contain strings, which must map
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# to an OS::Heat::AccessPolicy in this stack
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# If a non-string (e.g embedded IAM dict policy) is passed, we
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# ignore the policy (don't reject it because we previously ignored
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# and we don't want to break templates which previously worked
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if not isinstance(policy, basestring):
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logger.warning(_("Ignoring policy %s, must be string "
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"resource name") % policy)
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continue
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try:
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policy_rsrc = self.stack[policy]
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except KeyError:
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logger.error(_("Policy %(policy)s does not exist in stack "
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"%(stack)s") % {
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'policy': policy,
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'stack': self.stack.name})
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return False
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if not callable(getattr(policy_rsrc, 'access_allowed', None)):
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logger.error(_("Policy %s is not an AccessPolicy resource") %
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policy)
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return False
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return True
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def handle_create(self):
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passwd = ''
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profile = self.properties[self.LOGIN_PROFILE]
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if profile and self.LOGIN_PROFILE_PASSWORD in profile:
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passwd = profile[self.LOGIN_PROFILE_PASSWORD]
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if self.properties[self.POLICIES]:
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if not self._validate_policies(self.properties[self.POLICIES]):
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raise exception.InvalidTemplateAttribute(resource=self.name,
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key=self.POLICIES)
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uid = self.keystone().create_stack_user(self.physical_resource_name(),
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passwd)
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self.resource_id_set(uid)
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def handle_delete(self):
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if self.resource_id is None:
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logger.error(_("Cannot delete User resource before user "
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"created!"))
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return
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try:
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self.keystone().delete_stack_user(self.resource_id)
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except kc_exception.NotFound:
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pass
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def handle_suspend(self):
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if self.resource_id is None:
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logger.error(_("Cannot suspend User resource before user "
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"created!"))
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return
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self.keystone().disable_stack_user(self.resource_id)
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def handle_resume(self):
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if self.resource_id is None:
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logger.error(_("Cannot resume User resource before user "
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"created!"))
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return
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self.keystone().enable_stack_user(self.resource_id)
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def FnGetRefId(self):
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return unicode(self.physical_resource_name())
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def access_allowed(self, resource_name):
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policies = (self.properties[self.POLICIES] or [])
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for policy in policies:
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if not isinstance(policy, basestring):
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logger.warning(_("Ignoring policy %s, must be string "
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"resource name") % policy)
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continue
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policy_rsrc = self.stack[policy]
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if not policy_rsrc.access_allowed(resource_name):
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return False
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return True
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class AccessKey(resource.Resource):
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PROPERTIES = (
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SERIAL, USER_NAME, STATUS,
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) = (
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'Serial', 'UserName', 'Status',
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)
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properties_schema = {
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SERIAL: properties.Schema(
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properties.Schema.INTEGER,
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_('Not Implemented.'),
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implemented=False
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),
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USER_NAME: properties.Schema(
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properties.Schema.STRING,
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_('The name of the user that the new key will belong to.'),
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required=True
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),
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STATUS: properties.Schema(
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properties.Schema.STRING,
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_('Not Implemented.'),
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constraints=[
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constraints.AllowedValues(['Active', 'Inactive']),
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],
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implemented=False
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),
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}
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attributes_schema = {
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'UserName': _('Username associated with the AccessKey.'),
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'SecretAccessKey': _('Keypair secret key.'),
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}
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def __init__(self, name, json_snippet, stack):
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super(AccessKey, self).__init__(name, json_snippet, stack)
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self._secret = None
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if self.resource_id:
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self._register_access_key()
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def _get_user(self):
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"""
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Helper function to derive the keystone userid, which is stored in the
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resource_id of the User associated with this key. We want to avoid
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looking the name up via listing keystone users, as this requires admin
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rights in keystone, so FnGetAtt which calls _secret_accesskey won't
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work for normal non-admin users
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"""
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# Lookup User resource by intrinsic reference (which is what is passed
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# into the UserName parameter. Would be cleaner to just make the User
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# resource return resource_id for FnGetRefId but the AWS definition of
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# user does say it returns a user name not ID
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return self.stack.resource_by_refid(self.properties[self.USER_NAME])
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def handle_create(self):
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user = self._get_user()
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if user is None:
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raise exception.NotFound(_('could not find user %s') %
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self.properties[self.USER_NAME])
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kp = self.keystone().create_ec2_keypair(user.resource_id)
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if not kp:
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raise exception.Error(_("Error creating ec2 keypair for user %s") %
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user)
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self.resource_id_set(kp.access)
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self._secret = kp.secret
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self._register_access_key()
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# Store the secret key, encrypted, in the DB so we don't have to
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# re-request it from keystone every time someone requests the
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# SecretAccessKey attribute
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db_api.resource_data_set(self, 'secret_key', kp.secret,
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redact=True)
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# Also store the credential ID as this should be used to manage
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# the credential rather than the access key via v3/credentials
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db_api.resource_data_set(self, 'credential_id', kp.id,
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redact=True)
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def handle_delete(self):
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self._secret = None
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if self.resource_id is None:
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return
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user = self._get_user()
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if user is None:
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logger.warning(_('Error deleting %s - user not found') % str(self))
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return
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user_id = user.resource_id
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if user_id:
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try:
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self.keystone().delete_ec2_keypair(user_id, self.resource_id)
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except kc_exception.NotFound:
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pass
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self.resource_id_set(None)
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def _secret_accesskey(self):
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'''
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Return the user's access key, fetching it from keystone if necessary
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'''
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if self._secret is None:
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if not self.resource_id:
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logger.warn(_('could not get secret for %(username)s '
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'Error:%(msg)s') % {
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'username': self.properties[self.USER_NAME],
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'msg': "resource_id not yet set"})
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else:
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# First try to retrieve the secret from resource_data, but
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# for backwards compatibility, fall back to requesting from
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# keystone
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try:
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self._secret = db_api.resource_data_get(self, 'secret_key')
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except exception.NotFound:
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try:
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user_id = self._get_user().resource_id
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kp = self.keystone().get_ec2_keypair(
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user_id=user_id, access=self.resource_id)
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self._secret = kp.secret
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# Store the key in resource_data
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db_api.resource_data_set(self, 'secret_key',
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kp.secret, redact=True)
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# And the ID of the v3 credential
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db_api.resource_data_set(self, 'credential_id',
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kp.id, redact=True)
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except Exception as ex:
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logger.warn(
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_('could not get secret for %(username)s '
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'Error:%(msg)s') % {
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'username': self.properties[self.USER_NAME],
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'msg': str(ex)})
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return self._secret or '000-000-000'
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def _resolve_attribute(self, name):
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if name == 'UserName':
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return self.properties[self.USER_NAME]
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elif name == 'SecretAccessKey':
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return self._secret_accesskey()
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def _register_access_key(self):
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def access_allowed(resource_name):
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return self._get_user().access_allowed(resource_name)
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self.stack.register_access_allowed_handler(
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self.resource_id, access_allowed)
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class AccessPolicy(resource.Resource):
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PROPERTIES = (
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ALLOWED_RESOURCES,
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) = (
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'AllowedResources',
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)
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properties_schema = {
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ALLOWED_RESOURCES: properties.Schema(
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properties.Schema.LIST,
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_('Resources that users are allowed to access by the '
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'DescribeStackResource API.'),
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required=True
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),
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}
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def handle_create(self):
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pass
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def validate(self):
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"""Make sure all the AllowedResources are present."""
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super(AccessPolicy, self).validate()
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resources = self.properties[self.ALLOWED_RESOURCES]
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# All of the provided resource names must exist in this stack
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for resource in resources:
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if resource not in self.stack:
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msg = _("AccessPolicy resource %s not in stack") % resource
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logger.error(msg)
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raise exception.StackValidationFailed(message=msg)
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def access_allowed(self, resource_name):
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return resource_name in self.properties[self.ALLOWED_RESOURCES]
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def resource_mapping():
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return {
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'AWS::IAM::User': User,
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'AWS::IAM::AccessKey': AccessKey,
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'OS::Heat::AccessPolicy': AccessPolicy,
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}
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