246 lines
9.6 KiB
Python
246 lines
9.6 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
"""Main entry point into the EC2 Credentials service.
|
|
|
|
This service allows the creation of access/secret credentials used for
|
|
the ec2 interop layer of OpenStack.
|
|
|
|
A user can create as many access/secret pairs, each of which map to a
|
|
specific tenant. This is required because OpenStack supports a user
|
|
belonging to multiple tenants, whereas the signatures created on ec2-style
|
|
requests don't allow specification of which tenant the user wishs to act
|
|
upon.
|
|
|
|
To complete the cycle, we provide a method that OpenStack services can
|
|
use to validate a signature and get a corresponding openstack token. This
|
|
token allows method calls to other services within the context the
|
|
access/secret was created. As an example, nova requests keystone to validate
|
|
the signature of a request, receives a token, and then makes a request to
|
|
glance to list images needed to perform the requested task.
|
|
|
|
"""
|
|
|
|
import uuid
|
|
|
|
import webob.exc
|
|
|
|
from keystone import catalog
|
|
from keystone import config
|
|
from keystone import identity
|
|
from keystone import policy
|
|
from keystone import service
|
|
from keystone import token
|
|
from keystone.common import manager
|
|
from keystone.common import utils
|
|
from keystone.common import wsgi
|
|
|
|
|
|
CONF = config.CONF
|
|
|
|
|
|
class Manager(manager.Manager):
|
|
"""Default pivot point for the EC2 Credentials backend.
|
|
|
|
See :mod:`keystone.common.manager.Manager` for more details on how this
|
|
dynamically calls the backend.
|
|
|
|
"""
|
|
|
|
def __init__(self):
|
|
super(Manager, self).__init__(CONF.ec2.driver)
|
|
|
|
|
|
class Ec2Extension(wsgi.ExtensionRouter):
|
|
def add_routes(self, mapper):
|
|
ec2_controller = Ec2Controller()
|
|
# validation
|
|
mapper.connect('/ec2tokens',
|
|
controller=ec2_controller,
|
|
action='authenticate',
|
|
conditions=dict(method=['POST']))
|
|
|
|
# crud
|
|
mapper.connect('/users/{user_id}/credentials/OS-EC2',
|
|
controller=ec2_controller,
|
|
action='create_credential',
|
|
conditions=dict(method=['POST']))
|
|
mapper.connect('/users/{user_id}/credentials/OS-EC2',
|
|
controller=ec2_controller,
|
|
action='get_credentials',
|
|
conditions=dict(method=['GET']))
|
|
mapper.connect('/users/{user_id}/credentials/OS-EC2/{credential_id}',
|
|
controller=ec2_controller,
|
|
action='get_credential',
|
|
conditions=dict(method=['GET']))
|
|
mapper.connect('/users/{user_id}/credentials/OS-EC2/{credential_id}',
|
|
controller=ec2_controller,
|
|
action='delete_credential',
|
|
conditions=dict(method=['DELETE']))
|
|
|
|
|
|
class Ec2Controller(wsgi.Application):
|
|
def __init__(self):
|
|
self.catalog_api = catalog.Manager()
|
|
self.identity_api = identity.Manager()
|
|
self.token_api = token.Manager()
|
|
self.policy_api = policy.Manager()
|
|
self.ec2_api = Manager()
|
|
super(Ec2Controller, self).__init__()
|
|
|
|
def check_signature(self, creds_ref, credentials):
|
|
signer = utils.Ec2Signer(creds_ref['secret'])
|
|
signature = signer.generate(credentials)
|
|
if signature == credentials['signature']:
|
|
return
|
|
# NOTE(vish): Some libraries don't use the port when signing
|
|
# requests, so try again without port.
|
|
elif ':' in credentials['signature']:
|
|
hostname, _port = credentials['host'].split(':')
|
|
credentials['host'] = hostname
|
|
signature = signer.generate(credentials)
|
|
if signature != credentials.signature:
|
|
# TODO(termie): proper exception
|
|
msg = 'Invalid signature'
|
|
raise webob.exc.HTTPUnauthorized(explanation=msg)
|
|
else:
|
|
msg = 'Signature not supplied'
|
|
raise webob.exc.HTTPUnauthorized(explanation=msg)
|
|
|
|
def authenticate(self, context, credentials=None,
|
|
ec2Credentials=None):
|
|
"""Validate a signed EC2 request and provide a token.
|
|
|
|
Other services (such as Nova) use this **admin** call to determine
|
|
if a request they signed received is from a valid user.
|
|
|
|
If it is a valid signature, an openstack token that maps
|
|
to the user/tenant is returned to the caller, along with
|
|
all the other details returned from a normal token validation
|
|
call.
|
|
|
|
The returned token is useful for making calls to other
|
|
OpenStack services within the context of the request.
|
|
|
|
:param context: standard context
|
|
:param credentials: dict of ec2 signature
|
|
:param ec2Credentials: DEPRECATED dict of ec2 signature
|
|
:returns: token: openstack token equivalent to access key along
|
|
with the corresponding service catalog and roles
|
|
"""
|
|
|
|
# FIXME(ja): validate that a service token was used!
|
|
|
|
# NOTE(termie): backwards compat hack
|
|
if not credentials and ec2Credentials:
|
|
credentials = ec2Credentials
|
|
|
|
creds_ref = self.ec2_api.get_credential(context,
|
|
credentials['access'])
|
|
if not creds_ref:
|
|
msg = 'Access key not found'
|
|
raise webob.exc.HTTPUnauthorized(explanation=msg)
|
|
|
|
self.check_signature(creds_ref, credentials)
|
|
|
|
# TODO(termie): don't create new tokens every time
|
|
# TODO(termie): this is copied from TokenController.authenticate
|
|
token_id = uuid.uuid4().hex
|
|
tenant_ref = self.identity_api.get_tenant(
|
|
context=context,
|
|
tenant_id=creds_ref['tenant_id'])
|
|
user_ref = self.identity_api.get_user(
|
|
context=context,
|
|
user_id=creds_ref['user_id'])
|
|
metadata_ref = self.identity_api.get_metadata(
|
|
context=context,
|
|
user_id=user_ref['id'],
|
|
tenant_id=tenant_ref['id'])
|
|
catalog_ref = self.catalog_api.get_catalog(
|
|
context=context,
|
|
user_id=user_ref['id'],
|
|
tenant_id=tenant_ref['id'],
|
|
metadata=metadata_ref)
|
|
|
|
token_ref = self.token_api.create_token(
|
|
context, token_id, dict(expires='',
|
|
id=token_id,
|
|
user=user_ref,
|
|
tenant=tenant_ref,
|
|
metadata=metadata_ref))
|
|
|
|
# TODO(termie): optimize this call at some point and put it into the
|
|
# the return for metadata
|
|
# fill out the roles in the metadata
|
|
roles_ref = []
|
|
for role_id in metadata_ref.get('roles', []):
|
|
roles_ref.append(self.identity_api.get_role(context, role_id))
|
|
|
|
# TODO(termie): make this a util function or something
|
|
# TODO(termie): i don't think the ec2 middleware currently expects a
|
|
# full return, but it contains a note saying that it
|
|
# would be better to expect a full return
|
|
token_controller = service.TokenController()
|
|
return token_controller._format_authenticate(
|
|
token_ref, roles_ref, catalog_ref)
|
|
|
|
def create_credential(self, context, user_id, tenant_id):
|
|
"""Create a secret/access pair for use with ec2 style auth.
|
|
|
|
Generates a new set of credentials that map the the user/tenant
|
|
pair.
|
|
|
|
:param context: standard context
|
|
:param user_id: id of user
|
|
:param tenant_id: id of tenant
|
|
:returns: credential: dict of ec2 credential
|
|
"""
|
|
# TODO(termie): validate that this request is valid for given user
|
|
# tenant
|
|
cred_ref = {'user_id': user_id,
|
|
'tenant_id': tenant_id,
|
|
'access': uuid.uuid4().hex,
|
|
'secret': uuid.uuid4().hex}
|
|
self.ec2_api.create_credential(context, cred_ref['access'], cred_ref)
|
|
return {'credential': cred_ref}
|
|
|
|
def get_credentials(self, context, user_id):
|
|
"""List all credentials for a user.
|
|
|
|
:param context: standard context
|
|
:param user_id: id of user
|
|
:returns: credentials: list of ec2 credential dicts
|
|
"""
|
|
|
|
# TODO(termie): validate that this request is valid for given user
|
|
# tenant
|
|
return {'credentials': self.ec2_api.list_credentials(context, user_id)}
|
|
|
|
def get_credential(self, context, user_id, credential_id):
|
|
"""Retreive a user's access/secret pair by the access key.
|
|
|
|
Grab the full access/secret pair for a given access key.
|
|
|
|
:param context: standard context
|
|
:param user_id: id of user
|
|
:param credential_id: access key for credentials
|
|
:returns: credential: dict of ec2 credential
|
|
"""
|
|
# TODO(termie): validate that this request is valid for given user
|
|
# tenant
|
|
return {'credential': self.ec2_api.get_credential(context,
|
|
credential_id)}
|
|
|
|
def delete_credential(self, context, user_id, credential_id):
|
|
"""Delete a user's access/secret pair.
|
|
|
|
Used to revoke a user's access/secret pair
|
|
|
|
:param context: standard context
|
|
:param user_id: id of user
|
|
:param credential_id: access key for credentials
|
|
:returns: bool: success
|
|
"""
|
|
# TODO(termie): validate that this request is valid for given user
|
|
# tenant
|
|
return self.ec2_api.delete_credential(context, credential_id)
|