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# Software Name: MOON
# Version: 5.4
# SPDX-FileCopyrightText: Copyright (c) 2018-2020 Orange and its contributors
# SPDX-License-Identifier: Apache-2.0
# This software is distributed under the 'Apache License 2.0',
# the text of which is available at 'http://www.apache.org/licenses/LICENSE-2.0.txt'
# or see the "LICENSE" file for more details.
import copy
import logging
from uuid import uuid4
from moon_utilities import exceptions
logger = logging.getLogger("moon.utilities." + __name__)
class Context:
def __init__(self, init_context, cache):
if init_context is None:
raise Exception("Invalid context content object")
self.cache = cache
self.__current_request = None
self.__request_id = None
self.__meta_rule_ids = None
self.__pdp_set = {}
self.__index = -1
self.__pdp_id = init_context.get("pdp_id")
if self.__pdp_id:
self.__pdp_value = copy.deepcopy(self.cache.pdp[self.__pdp_id])
else:
self.__pdp_id = uuid4().hex
self.__pdp_value = self.__build_pdp()
self.cache.add_pdp(self.__pdp_id, self.__pdp_value)
self.__subject = init_context.get("subject_name")
self.__object = init_context.get("object_name")
self.__action = init_context.get("action_name")
self.__request_id = init_context.get("req_id")
self.__meta_rule_ids = self.cache.get_meta_rule_ids_from_pdp_value(self.__pdp_value)
self.__meta_rules = self.cache.meta_rules
def __build_pdp(self):
_pdp = {
'name': 'abstract_pdp',
'description': '',
'vim_project_id': 'default',
'security_pipeline': []
}
policy_id = list(self.cache.policies.keys())[0]
_pdp['security_pipeline'] = [policy_id]
return _pdp
def delete_cache(self):
self.cache = {}
def set_cache(self, cache):
self.cache = cache
def increment_index(self):
self.__index += 1
self.__init_current_request()
self.__init_pdp_set()
@property
def current_state(self):
self.__validate_meta_rule_content(self.__pdp_set[self.__meta_rule_ids[self.__index]])
return self.__pdp_set[self.__meta_rule_ids[self.__index]]['effect']
@current_state.setter
def current_state(self, state):
if state not in ("grant", "deny", "passed"):
state = "passed"
self.__validate_meta_rule_content(self.__pdp_set[self.__meta_rule_ids[self.__index]])
self.__pdp_set[self.__meta_rule_ids[self.__index]]['effect'] = state
@current_state.deleter
def current_state(self):
self.__validate_meta_rule_content(self.__pdp_set[self.__meta_rule_ids[self.__index]])
self.__pdp_set[self.__meta_rule_ids[self.__index]]['effect'] = "unset"
@property
def current_policy_id(self):
if "security_pipeline" not in self.__pdp_value:
raise exceptions.AuthzException('Cannot find security_pipeline key within pdp.')
return self.__pdp_value["security_pipeline"][self.__index]
@current_policy_id.setter
def current_policy_id(self, value):
pass
@current_policy_id.deleter
def current_policy_id(self):
pass
def __init_current_request(self):
if "security_pipeline" not in self.__pdp_value:
raise exceptions.PdpContentError
self.__subject = self.cache.get_subject(
self.__pdp_value["security_pipeline"][self.__index],
self.__subject)
self.__object = self.cache.get_object(
self.__pdp_value["security_pipeline"][self.__index],
self.__object)
self.__action = self.cache.get_action(
self.__pdp_value["security_pipeline"][self.__index],
self.__action)
self.__current_request = dict(self.initial_request)
def __init_pdp_set(self):
for meta_rule_id in self.__meta_rule_ids:
self.__pdp_set[meta_rule_id] = dict()
self.__pdp_set[meta_rule_id]["meta_rules"] = self.__meta_rules[meta_rule_id]
self.__pdp_set[meta_rule_id]["target"] = self.__add_target(meta_rule_id)
self.__pdp_set[meta_rule_id]["effect"] = "unset"
self.__pdp_set["effect"] = "deny"
def update_target(self):
# FIXME: not used...
for meta_rule_id in self.__meta_rule_ids:
result = dict()
_subject = self.__current_request["subject"]
_object = self.__current_request["object"]
_action = self.__current_request["action"]
meta_rules = self.cache.meta_rules
policy_id = self.cache.get_policy_from_meta_rules(meta_rule_id)
if 'subject_categories' not in meta_rules[meta_rule_id]:
raise exceptions.MetaRuleContentError(" 'subject_categories' key not found ")
self.cache.update_assignments(policy_id)
for sub_cat in meta_rules[meta_rule_id]['subject_categories']:
if sub_cat not in result:
result[sub_cat] = []
result[sub_cat].extend(
self.cache.get_subject_assignments(policy_id, _subject, sub_cat))
if 'object_categories' not in meta_rules[meta_rule_id]:
raise exceptions.MetaRuleContentError(" 'object_categories' key not found ")
for obj_cat in meta_rules[meta_rule_id]['object_categories']:
if obj_cat not in result:
result[obj_cat] = []
result[obj_cat].extend(
self.cache.get_object_assignments(policy_id, _object, obj_cat))
if 'action_categories' not in meta_rules[meta_rule_id]:
raise exceptions.MetaRuleContentError(" 'action_categories' key not found ")
for act_cat in meta_rules[meta_rule_id]['action_categories']:
if act_cat not in result:
result[act_cat] = []
result[act_cat].extend(
self.cache.get_action_assignments(policy_id, _action, act_cat))
self.__pdp_set[meta_rule_id]["target"] = result
def __add_target(self, meta_rule_id):
"""build target from meta_rule
Target is dict of categories as keys ; and the value of each category
will be a list of assignments
"""
result = dict()
_subject = self.__current_request["subject"]
_object = self.__current_request["object"]
_action = self.__current_request["action"]
meta_rules = self.cache.meta_rules
policy_id = self.cache.get_policy_from_meta_rules(meta_rule_id)
if 'subject_categories' not in meta_rules[meta_rule_id]:
raise exceptions.MetaRuleContentError(" 'subject_categories' key not found ")
for sub_cat in meta_rules[meta_rule_id]['subject_categories']:
if sub_cat not in result:
result[sub_cat] = []
if sub_cat.startswith("attributes:"):
result[sub_cat].append(
"attributes:" +
self.cache.attributes.get(sub_cat.replace("attributes:", ""), []))
else:
result[sub_cat].extend(
self.cache.get_subject_assignments(policy_id, _subject, sub_cat))
if 'object_categories' not in meta_rules[meta_rule_id]:
raise exceptions.MetaRuleContentError(" 'object_categories' key not found ")
for obj_cat in meta_rules[meta_rule_id]['object_categories']:
if obj_cat not in result:
result[obj_cat] = []
if obj_cat.startswith("attributes:"):
result[obj_cat].append(
"attributes:" +
self.cache.attributes.get(obj_cat.replace("attributes:", ""), []))
else:
result[obj_cat].extend(
self.cache.get_object_assignments(policy_id, _object, obj_cat))
if 'action_categories' not in meta_rules[meta_rule_id]:
raise exceptions.MetaRuleContentError(" 'action_categories' key not found ")
for act_cat in meta_rules[meta_rule_id]['action_categories']:
if act_cat not in result:
result[act_cat] = []
if act_cat.startswith("attributes:"):
result[act_cat].append(
"attributes:" +
self.cache.attributes.get(act_cat.replace("attributes:", ""), []))
else:
result[act_cat].extend(
self.cache.get_action_assignments(policy_id, _action, act_cat))
return result
def __repr__(self):
return """PDP ID: {id}
current_request: {current_request}
request_id: {request_id}
index: {index}
headers: {headers}
pdp_set: {pdp_set}
""".format(
id=self.__pdp_id,
current_request=self.__current_request,
request_id=self.__request_id,
headers=self.__meta_rule_ids,
pdp_set=self.__pdp_set,
index=self.__index
)
def to_dict(self):
return {
"initial_request": copy.deepcopy(self.initial_request),
"current_request": copy.deepcopy(self.__current_request),
"headers": copy.deepcopy(self.__meta_rule_ids),
"index": copy.deepcopy(self.__index),
"pdp_set": copy.deepcopy(self.__pdp_set),
"request_id": copy.deepcopy(self.__request_id),
# "manager_url": copy.deepcopy(self.__manager_url),
# "interface_name": copy.deepcopy(self.__interface_name),
}
@property
def request_id(self):
return self.__request_id
@request_id.setter
def request_id(self, value):
raise Exception("You cannot update the request_id")
@request_id.deleter
def request_id(self):
raise Exception("You cannot update the request_id")
@property
def initial_request(self):
return {
"subject": self.__subject,
"object": self.__object,
"action": self.__action,
}
@initial_request.setter
def initial_request(self, value):
raise Exception("You are not allowed to update the initial_request")
@initial_request.deleter
def initial_request(self):
raise Exception("You are not allowed to delete the initial_request")
@property
def current_request(self):
if not self.__current_request:
self.__current_request = dict(self.initial_request)
return self.__current_request
@current_request.setter
def current_request(self, value):
self.__current_request = copy.deepcopy(value)
# Note (asteroide): if the current request is modified,
# we must update the PDP Set.
self.__init_pdp_set()
@current_request.deleter
def current_request(self):
self.__current_request = {}
self.__pdp_set = {}
'''
[Note ] Refactor name of headers to meta_rule_ids done ,
may need to refactor getter and setter of headers
'''
@property
def headers(self):
return self.__meta_rule_ids
@headers.setter
def headers(self, meta_rule_ids):
self.__meta_rule_ids = meta_rule_ids
@headers.deleter
def headers(self):
self.__meta_rule_ids = list()
@property
def index(self):
return self.__index
@index.setter
def index(self, index):
self.__index += 1
@index.deleter
def index(self):
self.__index = -1
@property
def pdp_set(self):
return self.__pdp_set
@pdp_set.setter
def pdp_set(self, value):
raise Exception("You are not allowed to modify the pdp_set")
@pdp_set.deleter
def pdp_set(self):
self.__pdp_set = {}
@staticmethod
def __validate_meta_rule_content(meta_rules):
if 'effect' not in meta_rules:
raise exceptions.PdpContentError("effect not in meta_rules")
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