379 lines
14 KiB
Python
379 lines
14 KiB
Python
"""passbook OAuth2 Authorization views"""
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from dataclasses import dataclass, field
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from typing import List, Optional, Set
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from urllib.parse import parse_qs, urlencode, urlsplit, urlunsplit
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from uuid import uuid4
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from django.http import HttpRequest, HttpResponse
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from django.shortcuts import get_object_or_404, redirect
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from django.utils import timezone
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from django.views import View
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from structlog import get_logger
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from passbook.core.models import Application, Token
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from passbook.flows.models import in_memory_stage
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from passbook.flows.planner import (
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PLAN_CONTEXT_APPLICATION,
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PLAN_CONTEXT_SSO,
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FlowPlan,
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FlowPlanner,
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)
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from passbook.flows.stage import StageView
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from passbook.flows.views import SESSION_KEY_PLAN
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from passbook.lib.utils.time import timedelta_from_string
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from passbook.lib.utils.urls import redirect_with_qs
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from passbook.lib.views import bad_request_message
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from passbook.policies.mixins import PolicyAccessMixin
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from passbook.providers.oauth2.constants import (
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PROMPT_CONSNET,
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PROMPT_NONE,
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SCOPE_OPENID,
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)
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from passbook.providers.oauth2.errors import (
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AuthorizeError,
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ClientIdError,
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OAuth2Error,
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RedirectUriError,
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)
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from passbook.providers.oauth2.models import (
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AuthorizationCode,
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GrantTypes,
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OAuth2Provider,
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ResponseTypes,
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)
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from passbook.providers.oauth2.views.userinfo import UserInfoView
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from passbook.stages.consent.models import ConsentMode, ConsentStage
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from passbook.stages.consent.stage import (
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PLAN_CONTEXT_CONSENT_TEMPLATE,
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ConsentStageView,
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)
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LOGGER = get_logger()
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PLAN_CONTEXT_PARAMS = "params"
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PLAN_CONTEXT_SCOPE_DESCRIPTIONS = "scope_descriptions"
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ALLOWED_PROMPT_PARAMS = {PROMPT_NONE, PROMPT_CONSNET}
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@dataclass
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# pylint: disable=too-many-instance-attributes
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class OAuthAuthorizationParams:
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"""Parameteres required to authorize an OAuth Client"""
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client_id: str
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redirect_uri: str
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response_type: str
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scope: List[str]
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state: str
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nonce: str
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prompt: Set[str]
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grant_type: str
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provider: OAuth2Provider = field(default_factory=OAuth2Provider)
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code_challenge: Optional[str] = None
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code_challenge_method: Optional[str] = None
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@staticmethod
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def from_request(request: HttpRequest) -> "OAuthAuthorizationParams":
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"""
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Get all the params used by the Authorization Code Flow
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(and also for the Implicit and Hybrid).
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See: http://openid.net/specs/openid-connect-core-1_0.html#AuthRequest
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"""
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# Because in this endpoint we handle both GET
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# and POST request.
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query_dict = request.POST if request.method == "POST" else request.GET
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response_type = query_dict.get("response_type", "")
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grant_type = None
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# Determine which flow to use.
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if response_type in [ResponseTypes.CODE]:
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grant_type = GrantTypes.AUTHORIZATION_CODE
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elif response_type in [
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ResponseTypes.ID_TOKEN,
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ResponseTypes.ID_TOKEN_TOKEN,
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ResponseTypes.CODE_TOKEN,
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]:
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grant_type = GrantTypes.IMPLICIT
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elif response_type in [
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ResponseTypes.CODE_TOKEN,
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ResponseTypes.CODE_ID_TOKEN,
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ResponseTypes.CODE_ID_TOKEN_TOKEN,
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]:
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grant_type = GrantTypes.HYBRID
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# Grant type validation.
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if not grant_type:
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LOGGER.warning("Invalid response type", type=response_type)
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raise AuthorizeError(
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query_dict.get("redirect_uri", ""),
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"unsupported_response_type",
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grant_type,
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)
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return OAuthAuthorizationParams(
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client_id=query_dict.get("client_id", ""),
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redirect_uri=query_dict.get("redirect_uri", ""),
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response_type=response_type,
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grant_type=grant_type,
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scope=query_dict.get("scope", "").split(),
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state=query_dict.get("state", ""),
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nonce=query_dict.get("nonce", ""),
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prompt=ALLOWED_PROMPT_PARAMS.intersection(
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set(query_dict.get("prompt", "").split())
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),
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code_challenge=query_dict.get("code_challenge"),
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code_challenge_method=query_dict.get("code_challenge_method"),
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)
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def __post_init__(self):
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try:
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self.provider: OAuth2Provider = OAuth2Provider.objects.get(
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client_id=self.client_id
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)
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except OAuth2Provider.DoesNotExist:
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LOGGER.warning("Invalid client identifier", client_id=self.client_id)
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raise ClientIdError()
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is_open_id = SCOPE_OPENID in self.scope
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# Redirect URI validation.
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if is_open_id and not self.redirect_uri:
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LOGGER.warning("Missing redirect uri.")
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raise RedirectUriError()
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if self.redirect_uri not in self.provider.redirect_uris.split():
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LOGGER.warning(
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"Invalid redirect uri",
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redirect_uri=self.redirect_uri,
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excepted=self.provider.redirect_uris.split(),
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)
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raise RedirectUriError()
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if not is_open_id and (
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self.grant_type == GrantTypes.HYBRID
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or self.response_type
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in [ResponseTypes.ID_TOKEN, ResponseTypes.ID_TOKEN_TOKEN]
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):
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LOGGER.warning("Missing 'openid' scope.")
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raise AuthorizeError(self.redirect_uri, "invalid_scope", self.grant_type)
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# Nonce parameter validation.
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if is_open_id and self.grant_type == GrantTypes.IMPLICIT and not self.nonce:
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raise AuthorizeError(self.redirect_uri, "invalid_request", self.grant_type)
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# Response type parameter validation.
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if is_open_id and self.response_type != self.provider.response_type:
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raise AuthorizeError(self.redirect_uri, "invalid_request", self.grant_type)
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# PKCE validation of the transformation method.
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if self.code_challenge:
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if not (self.code_challenge_method in ["plain", "S256"]):
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raise AuthorizeError(
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self.redirect_uri, "invalid_request", self.grant_type
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)
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def create_code(self, request: HttpRequest) -> AuthorizationCode:
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"""Create an AuthorizationCode object for the request"""
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code = AuthorizationCode()
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code.user = request.user
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code.provider = self.provider
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code.code = uuid4().hex
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if self.code_challenge and self.code_challenge_method:
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code.code_challenge = self.code_challenge
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code.code_challenge_method = self.code_challenge_method
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code.expires_at = timezone.now() + timedelta_from_string(
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self.provider.token_validity
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)
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code.scope = self.scope
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code.nonce = self.nonce
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code.is_open_id = SCOPE_OPENID in self.scope
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return code
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class OAuthFulfillmentStage(StageView):
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"""Final stage, restores params from Flow."""
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params: OAuthAuthorizationParams
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provider: OAuth2Provider
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def get(self, request: HttpRequest, *args, **kwargs) -> HttpResponse:
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self.params: OAuthAuthorizationParams = self.executor.plan.context.pop(
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PLAN_CONTEXT_PARAMS
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)
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application: Application = self.executor.plan.context.pop(
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PLAN_CONTEXT_APPLICATION
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)
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self.provider = get_object_or_404(OAuth2Provider, pk=application.provider_id)
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try:
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# At this point we don't need to check permissions anymore
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if {PROMPT_NONE, PROMPT_CONSNET}.issubset(self.params.prompt):
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raise AuthorizeError(
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self.params.redirect_uri,
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"consent_required",
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self.params.grant_type,
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)
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return redirect(self.create_response_uri())
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except (ClientIdError, RedirectUriError) as error:
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# pylint: disable=no-member
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return bad_request_message(request, error.description, title=error.error)
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except AuthorizeError as error:
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uri = error.create_uri(self.params.redirect_uri, self.params.state)
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return redirect(uri)
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def create_response_uri(self) -> str:
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"""Create a final Response URI the user is redirected to."""
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uri = urlsplit(self.params.redirect_uri)
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query_params = parse_qs(uri.query)
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query_fragment = {}
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try:
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code = None
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if self.params.grant_type in [
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GrantTypes.AUTHORIZATION_CODE,
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GrantTypes.HYBRID,
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]:
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code = self.params.create_code(self.request)
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code.save()
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if self.params.grant_type == GrantTypes.AUTHORIZATION_CODE:
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query_params["code"] = code.code
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query_params["state"] = [
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str(self.params.state) if self.params.state else ""
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]
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elif self.params.grant_type in [GrantTypes.IMPLICIT, GrantTypes.HYBRID]:
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token: Token = self.provider.create_token(
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user=self.request.user, scope=self.params.scope,
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)
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# Check if response_type must include access_token in the response.
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if self.params.response_type in [
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ResponseTypes.id_token_token,
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ResponseTypes.code_id_token_token,
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ResponseTypes.token,
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ResponseTypes.code_token,
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]:
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query_fragment["access_token"] = token.access_token
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# We don't need id_token if it's an OAuth2 request.
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if SCOPE_OPENID in self.params.scope:
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id_token = token.create_id_token(
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user=self.request.user,
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request=self.request,
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scope=self.params.scope,
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)
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id_token.nonce = self.params.nonce
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id_token.scope = self.params.scope
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# Include at_hash when access_token is being returned.
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if "access_token" in query_fragment:
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id_token.at_hash = token.at_hash
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# Check if response_type must include id_token in the response.
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if self.params.response_type in [
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ResponseTypes.ID_TOKEN,
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ResponseTypes.ID_TOKEN_TOKEN,
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ResponseTypes.CODE_ID_TOKEN,
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ResponseTypes.CODE_ID_TOKEN_TOKEN,
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]:
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query_fragment["id_token"] = id_token.encode(self.provider)
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token.id_token = id_token
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else:
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token.id_token = {}
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# Store the token.
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token.save()
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# Code parameter must be present if it's Hybrid Flow.
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if self.params.grant_type == GrantTypes.HYBRID:
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query_fragment["code"] = code.code
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query_fragment["token_type"] = "bearer"
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query_fragment["expires_in"] = timedelta_from_string(
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self.provider.token_validity
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).seconds
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query_fragment["state"] = self.params.state if self.params.state else ""
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except OAuth2Error as error:
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LOGGER.exception("Error when trying to create response uri", error=error)
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raise AuthorizeError(
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self.params.redirect_uri, "server_error", self.params.grant_type
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)
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uri = uri._replace(
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query=urlencode(query_params, doseq=True),
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fragment=uri.fragment + urlencode(query_fragment, doseq=True),
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)
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return urlunsplit(uri)
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class AuthorizationFlowInitView(PolicyAccessMixin, View):
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"""OAuth2 Flow initializer, checks access to application and starts flow"""
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# pylint: disable=unused-argument
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def get(self, request: HttpRequest, *args, **kwargs) -> HttpResponse:
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"""Check access to application, start FlowPLanner, return to flow executor shell"""
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client_id = request.GET.get("client_id")
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# TODO: This whole block should be moved to a base class
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provider = get_object_or_404(OAuth2Provider, client_id=client_id)
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try:
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application = self.provider_to_application(provider)
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except Application.DoesNotExist:
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return self.handle_no_permission_authorized()
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# Check if user is unauthenticated, so we pass the application
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# for the identification stage
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if not request.user.is_authenticated:
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return self.handle_no_permission(application)
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# Check permissions
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result = self.user_has_access(application)
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if not result.passing:
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return self.handle_no_permission_authorized()
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# TODO: End block
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# Extract params so we can save them in the plan context
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try:
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params = OAuthAuthorizationParams.from_request(request)
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except (ClientIdError, RedirectUriError) as error:
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# pylint: disable=no-member
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return bad_request_message(request, error.description, title=error.error)
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# Regardless, we start the planner and return to it
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planner = FlowPlanner(provider.authorization_flow)
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# planner.use_cache = False
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planner.allow_empty_flows = True
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plan: FlowPlan = planner.plan(
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self.request,
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{
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PLAN_CONTEXT_SSO: True,
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PLAN_CONTEXT_APPLICATION: application,
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# OAuth2 related params
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PLAN_CONTEXT_PARAMS: params,
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PLAN_CONTEXT_SCOPE_DESCRIPTIONS: UserInfoView().get_scope_descriptions(
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params.scope
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),
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# Consent related params
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PLAN_CONTEXT_CONSENT_TEMPLATE: "providers/oauth2/consent.html",
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},
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)
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# OpenID clients can specify a `prompt` parameter, and if its set to consent we
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# need to inject a consent stage
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if PROMPT_CONSNET in params.prompt:
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if not any([isinstance(x, ConsentStageView) for x in plan.stages]):
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# Plan does not have any consent stage, so we add an in-memory one
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stage = ConsentStage(
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name="OAuth2 Provider In-memory consent stage",
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mode=ConsentMode.ALWAYS_REQUIRE,
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)
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plan.append(stage)
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plan.append(in_memory_stage(OAuthFulfillmentStage))
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self.request.session[SESSION_KEY_PLAN] = plan
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return redirect_with_qs(
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"passbook_flows:flow-executor-shell",
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self.request.GET,
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flow_slug=provider.authorization_flow.slug,
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)
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