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authentik/passbook/flows/views.py

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"""passbook multi-stage authentication engine"""
from typing import Optional
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from django.contrib.auth import login
from django.http import HttpRequest, HttpResponse
from django.shortcuts import get_object_or_404, redirect
from django.views.generic import View
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from structlog import get_logger
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from passbook.core.views.utils import PermissionDeniedView
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from passbook.flows.exceptions import EmptyFlowException, FlowNonApplicableException
from passbook.flows.models import Flow, FlowDesignation, Stage
from passbook.flows.planner import PLAN_CONTEXT_PENDING_USER, FlowPlan, FlowPlanner
from passbook.lib.config import CONFIG
from passbook.lib.utils.reflection import class_to_path, path_to_class
from passbook.lib.utils.urls import is_url_absolute, redirect_with_qs
from passbook.lib.views import bad_request_message
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LOGGER = get_logger()
# Argument used to redirect user after login
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NEXT_ARG_NAME = "next"
SESSION_KEY_PLAN = "passbook_flows_plan"
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class FlowExecutorView(View):
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"""Stage 1 Flow executor, passing requests to Stage Views"""
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flow: Flow
plan: FlowPlan
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current_stage: Stage
current_stage_view: View
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def setup(self, request: HttpRequest, flow_slug: str):
super().setup(request, flow_slug=flow_slug)
# TODO: Do we always need this?
self.flow = get_object_or_404(Flow, slug=flow_slug)
def _check_config_domain(self) -> Optional[HttpResponse]:
"""Checks if current request's domain matches configured Domain, and
adds a warning if not."""
current_domain = self.request.get_host()
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if ":" in current_domain:
current_domain, _ = current_domain.split(":")
config_domain = CONFIG.y("domain")
if current_domain != config_domain:
message = (
f"Current domain of '{current_domain}' doesn't "
f"match configured domain of '{config_domain}'."
)
LOGGER.warning(message, flow_slug=self.flow.slug)
return bad_request_message(self.request, message)
return None
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def handle_invalid_flow(self, exc: BaseException) -> HttpResponse:
"""When a flow is non-applicable check if user is on the correct domain"""
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if NEXT_ARG_NAME in self.request.GET:
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LOGGER.debug("Redirecting to next on fail")
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return redirect(self.request.GET.get(NEXT_ARG_NAME))
incorrect_domain_message = self._check_config_domain()
if incorrect_domain_message:
return incorrect_domain_message
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return bad_request_message(self.request, str(exc))
def dispatch(self, request: HttpRequest, flow_slug: str) -> HttpResponse:
# Early check if theres an active Plan for the current session
if SESSION_KEY_PLAN not in self.request.session:
LOGGER.debug(
"No active Plan found, initiating planner", flow_slug=flow_slug
)
try:
self.plan = self._initiate_plan()
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except FlowNonApplicableException as exc:
LOGGER.warning("Flow not applicable to current user", exc=exc)
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return self.handle_invalid_flow(exc)
except EmptyFlowException as exc:
LOGGER.warning("Flow is empty", exc=exc)
return self.handle_invalid_flow(exc)
else:
LOGGER.debug("Continuing existing plan", flow_slug=flow_slug)
self.plan = self.request.session[SESSION_KEY_PLAN]
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# We don't save the Plan after getting the next stage
# as it hasn't been successfully passed yet
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self.current_stage = self.plan.next()
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LOGGER.debug(
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"Current stage", current_stage=self.current_stage, flow_slug=self.flow.slug,
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)
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stage_cls = path_to_class(self.current_stage.type)
self.current_stage_view = stage_cls(self)
self.current_stage_view.request = request
return super().dispatch(request)
def get(self, request: HttpRequest, *args, **kwargs) -> HttpResponse:
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"""pass get request to current stage"""
LOGGER.debug(
"Passing GET",
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view_class=class_to_path(self.current_stage_view.__class__),
flow_slug=self.flow.slug,
)
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return self.current_stage_view.get(request, *args, **kwargs)
def post(self, request: HttpRequest, *args, **kwargs) -> HttpResponse:
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"""pass post request to current stage"""
LOGGER.debug(
"Passing POST",
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view_class=class_to_path(self.current_stage_view.__class__),
flow_slug=self.flow.slug,
)
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return self.current_stage_view.post(request, *args, **kwargs)
def _initiate_plan(self) -> FlowPlan:
planner = FlowPlanner(self.flow)
plan = planner.plan(self.request)
self.request.session[SESSION_KEY_PLAN] = plan
return plan
def _flow_done(self) -> HttpResponse:
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"""User Successfully passed all stages"""
backend = self.plan.context[PLAN_CONTEXT_PENDING_USER].backend
login(
self.request, self.plan.context[PLAN_CONTEXT_PENDING_USER], backend=backend
)
LOGGER.debug(
"Logged in",
user=self.plan.context[PLAN_CONTEXT_PENDING_USER],
flow_slug=self.flow.slug,
)
self.cancel()
next_param = self.request.GET.get(NEXT_ARG_NAME, None)
if next_param and not is_url_absolute(next_param):
return redirect(next_param)
return redirect_with_qs("passbook_core:overview")
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def stage_ok(self) -> HttpResponse:
"""Callback called by stages upon successful completion.
Persists updated plan and context to session."""
LOGGER.debug(
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"Stage ok",
stage_class=class_to_path(self.current_stage_view.__class__),
flow_slug=self.flow.slug,
)
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self.plan.stages.pop(0)
self.request.session[SESSION_KEY_PLAN] = self.plan
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if self.plan.stages:
LOGGER.debug(
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"Continuing with next stage",
reamining=len(self.plan.stages),
flow_slug=self.flow.slug,
)
return redirect_with_qs(
"passbook_flows:flow-executor", self.request.GET, **self.kwargs
)
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# User passed all stages
LOGGER.debug(
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"User passed all stages",
user=self.plan.context[PLAN_CONTEXT_PENDING_USER],
flow_slug=self.flow.slug,
)
return self._flow_done()
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def stage_invalid(self) -> HttpResponse:
"""Callback used stage when data is correct but a policy denies access
or the user account is disabled."""
LOGGER.debug("User invalid", flow_slug=self.flow.slug)
self.cancel()
return redirect_with_qs("passbook_flows:denied", self.request.GET)
def cancel(self) -> HttpResponse:
"""Cancel current execution and return a redirect"""
del self.request.session[SESSION_KEY_PLAN]
return redirect_with_qs("passbook_flows:denied", self.request.GET)
class FlowPermissionDeniedView(PermissionDeniedView):
"""User could not be authenticated"""
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class ToDefaultFlow(View):
"""Redirect to default flow matching by designation"""
designation: Optional[FlowDesignation] = None
def dispatch(self, request: HttpRequest) -> HttpResponse:
flow = get_object_or_404(Flow, designation=self.designation)
# TODO: Get Flow depending on subdomain?
return redirect_with_qs(
"passbook_flows:flow-executor", request.GET, flow_slug=flow.slug
)