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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain 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, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import base64 |
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from six.moves import http_client |
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from oslo_config import cfg |
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from st2common import log as logging |
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from st2common.exceptions.auth import TTLTooLargeException, UserNotFoundError |
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from st2common.exceptions.db import StackStormDBObjectNotFoundError |
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from st2common.exceptions.auth import NoNicknameOriginProvidedError, AmbiguousUserError |
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from st2common.exceptions.auth import NotServiceUserError |
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from st2common.persistence.auth import User |
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from st2common.util.pecan_util import abort_request |
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from st2common.services.access import create_token |
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from st2common.models.api.auth import TokenAPI |
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from st2auth.backends import get_backend_instance |
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LOG = logging.getLogger(__name__) |
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class AuthHandlerBase(object): |
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def handle_auth(self, request, headers=None, remote_addr=None, |
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remote_user=None, authorization=None, **kwargs): |
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raise NotImplementedError() |
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def _create_token_for_user(self, username, ttl=None): |
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tokendb = create_token(username=username, ttl=ttl) |
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return TokenAPI.from_model(tokendb) |
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def _get_username_for_request(self, username, request): |
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impersonate_user = getattr(request, 'user', None) |
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if impersonate_user is not None: |
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# check this is a service account |
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try: |
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if not User.get_by_name(username).is_service: |
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message = "Current user is not a service and cannot " \ |
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"request impersonated tokens" |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=message) |
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return |
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username = impersonate_user |
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except (UserNotFoundError, StackStormDBObjectNotFoundError): |
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message = "Could not locate user %s" % \ |
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(impersonate_user) |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=message) |
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return |
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else: |
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impersonate_user = getattr(request, 'impersonate_user', None) |
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nickname_origin = getattr(request, 'nickname_origin', None) |
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if impersonate_user is not None: |
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try: |
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# check this is a service account |
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if not User.get_by_name(username).is_service: |
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raise NotServiceUserError() |
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username = User.get_by_nickname(impersonate_user, |
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nickname_origin).name |
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except NotServiceUserError: |
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message = "Current user is not a service and cannot " \ |
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"request impersonated tokens" |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=message) |
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return |
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except (UserNotFoundError, StackStormDBObjectNotFoundError): |
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message = "Could not locate user %s@%s" % \ |
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(impersonate_user, nickname_origin) |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=message) |
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return |
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except NoNicknameOriginProvidedError: |
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message = "Nickname origin is not provided for nickname '%s'" % \ |
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impersonate_user |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=message) |
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return |
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except AmbiguousUserError: |
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message = "%s@%s matched more than one username" % \ |
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(impersonate_user, nickname_origin) |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=message) |
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return |
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return username |
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class ProxyAuthHandler(AuthHandlerBase): |
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def handle_auth(self, request, headers=None, remote_addr=None, |
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remote_user=None, authorization=None, **kwargs): |
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remote_addr = headers.get('x-forwarded-for', |
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remote_addr) |
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extra = {'remote_addr': remote_addr} |
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if remote_user: |
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ttl = getattr(request, 'ttl', None) |
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username = self._get_username_for_request(remote_user, request) |
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try: |
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token = self._create_token_for_user(username=username, |
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ttl=ttl) |
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except TTLTooLargeException as e: |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=e.message) |
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return token |
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LOG.audit('Access denied to anonymous user.', extra=extra) |
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abort_request() |
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class StandaloneAuthHandler(AuthHandlerBase): |
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def __init__(self, *args, **kwargs): |
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self._auth_backend = get_backend_instance(name=cfg.CONF.auth.backend) |
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super(StandaloneAuthHandler, self).__init__(*args, **kwargs) |
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def handle_auth(self, request, headers=None, remote_addr=None, remote_user=None, |
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authorization=None, **kwargs): |
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auth_backend = self._auth_backend.__class__.__name__ |
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extra = {'auth_backend': auth_backend, 'remote_addr': remote_addr} |
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if not authorization: |
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LOG.audit('Authorization header not provided', extra=extra) |
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abort_request() |
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return |
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auth_type, auth_value = authorization |
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if auth_type.lower() not in ['basic']: |
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extra['auth_type'] = auth_type |
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LOG.audit('Unsupported authorization type: %s' % (auth_type), extra=extra) |
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abort_request() |
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return |
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try: |
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auth_value = base64.b64decode(auth_value) |
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except Exception: |
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LOG.audit('Invalid authorization header', extra=extra) |
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abort_request() |
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return |
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split = auth_value.split(':') |
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if len(split) != 2: |
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LOG.audit('Invalid authorization header', extra=extra) |
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abort_request() |
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return |
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username, password = split |
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result = self._auth_backend |
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result = self._auth_backend.authenticate(username=username, password=password) |
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if result is True: |
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ttl = getattr(request, 'ttl', None) |
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username = self._get_username_for_request(username, request) |
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try: |
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token = self._create_token_for_user( |
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username=username, ttl=ttl) |
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return token |
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except TTLTooLargeException as e: |
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abort_request(status_code=http_client.BAD_REQUEST, |
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message=e.message) |
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return |
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LOG.audit('Invalid credentials provided', extra=extra) |
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abort_request() |
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StackStorm /
st2
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