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authentik/passbook/providers/oauth2/views/introspection.py

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"""passbook OAuth2 Token Introspection Views"""
from dataclasses import dataclass, field
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from django.http import HttpRequest, HttpResponse
from django.views import View
from structlog import get_logger
from passbook.providers.oauth2.errors import TokenIntrospectionError
from passbook.providers.oauth2.models import IDToken, OAuth2Provider, RefreshToken
from passbook.providers.oauth2.utils import (
TokenResponse,
extract_access_token,
extract_client_auth,
)
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LOGGER = get_logger()
@dataclass
class TokenIntrospectionParams:
"""Parameters for Token Introspection"""
token: RefreshToken
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provider: OAuth2Provider = field(init=False)
id_token: IDToken = field(init=False)
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def __post_init__(self):
if self.token.is_expired:
LOGGER.debug("Token is not valid")
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raise TokenIntrospectionError()
self.provider = self.token.provider
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self.id_token = self.token.id_token
if not self.token.id_token:
LOGGER.debug(
"token not an authentication token", token=self.token,
)
raise TokenIntrospectionError()
def authenticate_basic(self, request: HttpRequest) -> bool:
"""Attempt to authenticate via Basic auth of client_id:client_secret"""
client_id, client_secret = extract_client_auth(request)
if client_id == client_secret == "":
return False
if (
client_id != self.provider.client_id
or client_secret != self.provider.client_secret
):
LOGGER.debug("(basic) Provider for basic auth does not exist")
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raise TokenIntrospectionError()
return True
def authenticate_bearer(self, request: HttpRequest) -> bool:
"""Attempt to authenticate via token sent as bearer header"""
body_token = extract_access_token(request)
if not body_token:
return False
tokens = RefreshToken.objects.filter(access_token=body_token).select_related(
"provider"
)
if not tokens.exists():
LOGGER.debug("(bearer) Token does not exist")
raise TokenIntrospectionError()
if tokens.first().provider != self.provider:
LOGGER.debug("(bearer) Token providers don't match")
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raise TokenIntrospectionError()
return True
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@staticmethod
def from_request(request: HttpRequest) -> "TokenIntrospectionParams":
"""Extract required Parameters from HTTP Request"""
raw_token = request.POST.get("token")
token_type_hint = request.POST.get("token_type_hint", "access_token")
token_filter = {token_type_hint: raw_token}
if token_type_hint not in ["access_token", "refresh_token"]:
LOGGER.debug("token_type_hint has invalid value", value=token_type_hint)
raise TokenIntrospectionError()
try:
token: RefreshToken = RefreshToken.objects.select_related("provider").get(
**token_filter
)
except RefreshToken.DoesNotExist:
LOGGER.debug("Token does not exist", token=raw_token)
raise TokenIntrospectionError()
params = TokenIntrospectionParams(token=token)
if not any(
[params.authenticate_basic(request), params.authenticate_bearer(request)]
):
LOGGER.debug("Not authenticated")
raise TokenIntrospectionError()
return params
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class TokenIntrospectionView(View):
"""Token Introspection
https://tools.ietf.org/html/rfc7662"""
token: RefreshToken
params: TokenIntrospectionParams
provider: OAuth2Provider
id_token: IDToken
def post(self, request: HttpRequest) -> HttpResponse:
"""Introspection handler"""
try:
self.params = TokenIntrospectionParams.from_request(request)
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response_dic = {}
if self.params.id_token:
token_dict = self.params.id_token.to_dict()
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for k in ("aud", "sub", "exp", "iat", "iss"):
response_dic[k] = token_dict[k]
response_dic["active"] = True
response_dic["client_id"] = self.params.token.provider.client_id
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return TokenResponse(response_dic)
except TokenIntrospectionError:
return TokenResponse({"active": False})