91 lines
3.3 KiB
Python
91 lines
3.3 KiB
Python
# Copyright 2017 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# 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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#
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import functools
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import falcon
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from promenade import exceptions as ex
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# TODO: Add policy_engine
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policy_engine = None
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class ApiEnforcer(object):
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"""
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A decorator class for enforcing RBAC policies
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"""
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def __init__(self, action):
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self.action = action
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def __call__(self, f):
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@functools.wraps(f)
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def secure_handler(slf, req, resp, *args, **kwargs):
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ctx = req.context
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policy_eng = ctx.policy_engine
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slf.info(ctx, "Policy Engine: %s" % policy_eng.__class__.__name__)
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# perform auth
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slf.info(ctx, "Enforcing policy %s on request %s" %
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(self.action, ctx.request_id))
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# policy engine must be configured
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if policy_eng is None:
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slf.error(
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ctx,
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"Error-Policy engine required-action: %s" % self.action)
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raise ex.PromenadeException(
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title="Auth is not being handled by any policy engine",
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status=falcon.HTTP_500,
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retry=False)
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authorized = False
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try:
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if policy_eng.authorize(self.action, ctx):
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# authorized
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slf.info(ctx, "Request is authorized")
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authorized = True
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except Exception:
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# couldn't service the auth request
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slf.error(
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ctx,
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"Error - Expectation Failed - action: %s" % self.action)
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raise ex.ApiError(
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title="Expectation Failed",
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status=falcon.HTTP_417,
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retry=False)
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if authorized:
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return f(slf, req, resp, *args, **kwargs)
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else:
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slf.error(
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ctx,
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"Auth check failed. Authenticated:%s" % ctx.authenticated)
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# raise the appropriate response exeception
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if ctx.authenticated:
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slf.error(
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ctx,
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"Error: Forbidden access - action: %s" % self.action)
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raise ex.ApiError(
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title="Forbidden",
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status=falcon.HTTP_403,
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description="Credentials do not permit access",
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retry=False)
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else:
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slf.error(ctx, "Error - Unauthenticated access")
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raise ex.ApiError(
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title="Unauthenticated",
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status=falcon.HTTP_401,
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description="Credentials are not established",
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retry=False)
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return secure_handler
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