97 lines
3.4 KiB
Python
97 lines
3.4 KiB
Python
"""passbook policy engine"""
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from multiprocessing import Pipe
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from multiprocessing.connection import Connection
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from typing import List, Tuple
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from django.core.cache import cache
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from django.http import HttpRequest
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from structlog import get_logger
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from passbook.core.models import Policy, User
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from passbook.policy.struct import PolicyRequest
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from passbook.policy.process import PolicyProcess
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LOGGER = get_logger()
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def _cache_key(policy, user):
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return f"policy_{policy.pk}#{user.pk}"
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class PolicyEngine:
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"""Orchestrate policy checking, launch tasks and return result"""
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policies: List[Policy] = []
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__request: HttpRequest
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__user: User
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__proc_list: List[Tuple[Connection, PolicyProcess]] = []
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def __init__(self, policies, user: User = None, request: HttpRequest = None):
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self.policies = policies
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self.__request = request
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self.__user = user
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def for_user(self, user: User) -> 'PolicyEngine':
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"""Check policies for user"""
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self.__user = user
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return self
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def with_request(self, request: HttpRequest) -> 'PolicyEngine':
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"""Set request"""
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self.__request = request
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return self
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def _select_subclasses(self) -> List[Policy]:
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"""Make sure all Policies are their respective classes"""
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return Policy.objects \
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.filter(pk__in=[x.pk for x in self.policies]) \
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.select_subclasses() \
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.order_by('order')
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def build(self) -> 'PolicyEngine':
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"""Build task group"""
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if not self.__user:
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raise ValueError("User not set.")
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cached_policies = []
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request = PolicyRequest(self.__user)
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request.http_request = self.__request
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for policy in self._select_subclasses():
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cached_policy = cache.get(_cache_key(policy, self.__user), None)
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if cached_policy:
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LOGGER.debug("Taking result from cache", policy=policy.pk.hex)
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cached_policies.append(cached_policy)
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else:
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LOGGER.debug("Evaluating policy", policy=policy.pk.hex)
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our_end, task_end = Pipe(False)
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task = PolicyProcess()
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task.ret = task_end
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task.request = request
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task.policy = policy
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LOGGER.debug("Starting Process", class_name=task.__class__.__name__)
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task.start()
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self.__proc_list.append((our_end, task))
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# If all policies are cached, we have an empty list here.
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if self.__proc_list:
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for _, running_proc in self.__proc_list:
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running_proc.join()
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return self
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@property
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def result(self) -> Tuple[bool, List[str]]:
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"""Get policy-checking result"""
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messages: List[str] = []
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for our_end, _ in self.__proc_list:
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policy_result = our_end.recv()
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# passing = (policy_action == Policy.ACTION_ALLOW and policy_result) or \
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# (policy_action == Policy.ACTION_DENY and not policy_result)
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LOGGER.debug('Result=%r => %r', policy_result, policy_result.passing)
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if policy_result.messages:
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messages += policy_result.messages
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if not policy_result.passing:
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return False, messages
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return True, messages
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@property
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def passing(self) -> bool:
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"""Only get true/false if user passes"""
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return self.result[0]
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