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authentik/passbook/policy/engine.py

98 lines
3.3 KiB
Python

"""passbook policy engine"""
from multiprocessing import Pipe
from multiprocessing.connection import Connection
from typing import List, Tuple
from django.core.cache import cache
from django.http import HttpRequest
from structlog import get_logger
from passbook.core.models import Policy, PolicyResult, User
from passbook.policy.task import PolicyTask
LOGGER = get_logger()
def _cache_key(policy, user):
return "policy_%s#%s" % (policy.uuid, user.pk)
class PolicyEngine:
"""Orchestrate policy checking, launch tasks and return result"""
# __group = None
# __cached = None
policies: List[Policy] = []
__request: HttpRequest
__user: User
__proc_list: List[Tuple[Connection, PolicyTask]] = []
def __init__(self, policies, user: User = None, request: HttpRequest = None):
self.policies = policies
self.__request = request
self.__user = user
def for_user(self, user: User) -> 'PolicyEngine':
"""Check policies for user"""
self.__user = user
return self
def with_request(self, request: HttpRequest) -> 'PolicyEngine':
"""Set request"""
self.__request = request
return self
def build(self) -> 'PolicyEngine':
"""Build task group"""
if not self.__user:
raise ValueError("User not set.")
cached_policies = []
kwargs = {
'__password__': getattr(self.__user, '__password__', None),
'session': dict(getattr(self.__request, 'session', {}).items()),
'request': self.__request,
}
for policy in self.policies:
cached_policy = cache.get(_cache_key(policy, self.__user), None)
if cached_policy:
LOGGER.debug("Taking result from cache for %s", policy.pk.hex)
cached_policies.append(cached_policy)
else:
LOGGER.debug("Evaluating policy %s", policy.pk.hex)
our_end, task_end = Pipe(False)
task = PolicyTask()
task.ret = task_end
task.user = self.__user
task.policy = policy
task.params = kwargs
LOGGER.debug("Starting Process %s", task.__class__.__name__)
task.start()
self.__proc_list.append((our_end, task))
# If all policies are cached, we have an empty list here.
if self.__proc_list:
for _, running_proc in self.__proc_list:
running_proc.join()
return self
@property
def result(self):
"""Get policy-checking result"""
results: List[PolicyResult] = []
messages: List[str] = []
for our_end, _ in self.__proc_list:
results.append(our_end.recv())
for policy_result in results:
# passing = (policy_action == Policy.ACTION_ALLOW and policy_result) or \
# (policy_action == Policy.ACTION_DENY and not policy_result)
LOGGER.debug('Result=%r => %r', policy_result, policy_result.passing)
if policy_result.messages:
messages += policy_result.messages
if not policy_result.passing:
return False, messages
return True, messages
@property
def passing(self):
"""Only get true/false if user passes"""
return self.result[0]