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authentik/passbook/core/policies.py

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"""passbook core policy engine"""
from logging import getLogger
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from amqp.exceptions import UnexpectedFrame
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from celery import group
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from celery.exceptions import TimeoutError as CeleryTimeoutError
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from ipware import get_client_ip
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from passbook.core.celery import CELERY_APP
from passbook.core.models import Policy, User
LOGGER = getLogger(__name__)
@CELERY_APP.task()
def _policy_engine_task(user_pk, policy_pk, **kwargs):
"""Task wrapper to run policy checking"""
if not user_pk:
raise ValueError()
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policy_obj = Policy.objects.filter(pk=policy_pk).select_subclasses().first()
user_obj = User.objects.get(pk=user_pk)
for key, value in kwargs.items():
setattr(user_obj, key, value)
LOGGER.debug("Running policy `%s`#%s for user %s...", policy_obj.name,
policy_obj.pk.hex, user_obj)
policy_result = policy_obj.passes(user_obj)
# Handle policy result correctly if result, message or just result
message = None
if isinstance(policy_result, (tuple, list)):
policy_result, message = policy_result
# Invert result if policy.negate is set
if policy_obj.negate:
policy_result = not policy_result
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LOGGER.debug("Policy %r#%s got %s", policy_obj.name, policy_obj.pk.hex, policy_result)
return policy_obj.action, policy_result, message
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class PolicyEngine:
"""Orchestrate policy checking, launch tasks and return result"""
policies = None
_group = None
_request = None
_user = None
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_get_timeout = 0
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def __init__(self, policies):
self.policies = policies
self._request = None
self._user = None
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def for_user(self, user):
"""Check policies for user"""
self._user = user
return self
def with_request(self, request):
"""Set request"""
self._request = request
return self
def build(self):
"""Build task group"""
if not self._user:
raise ValueError("User not set.")
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signatures = []
kwargs = {
'__password__': getattr(self._user, '__password__', None),
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}
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if self._request:
kwargs['remote_ip'], _ = get_client_ip(self._request)
if not kwargs['remote_ip']:
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kwargs['remote_ip'] = '255.255.255.255'
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for policy in self.policies:
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signatures.append(_policy_engine_task.signature(
args=(self._user.pk, policy.pk.hex),
kwargs=kwargs,
time_limit=policy.timeout))
self._get_timeout += policy.timeout
self._get_timeout += 3
self._get_timeout = (self._get_timeout / len(self.policies)) * 1.5
LOGGER.debug("Set total policy timeout to %r", self._get_timeout)
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self._group = group(signatures)()
return self
@property
def result(self):
"""Get policy-checking result"""
messages = []
try:
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group_result = self._group.get(timeout=self._get_timeout)
except ValueError as exc:
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# ValueError can be thrown from _policy_engine_task when user is None
return False, [str(exc)]
except UnexpectedFrame as exc:
return False, [str(exc)]
except CeleryTimeoutError as exc:
return False, [str(exc)]
for policy_action, policy_result, policy_message in group_result:
passing = (policy_action == Policy.ACTION_ALLOW and policy_result) or \
(policy_action == Policy.ACTION_DENY and not policy_result)
LOGGER.debug('Action=%s, Result=%r => %r', policy_action, policy_result, passing)
if policy_message:
messages.append(policy_message)
if not passing:
return False, messages
return True, messages
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@property
def passing(self):
"""Only get true/false if user passes"""
return self.result[0]