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

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"""passbook OAuth2 Token views"""
from base64 import urlsafe_b64encode
from dataclasses import InitVar, dataclass
from hashlib import sha256
from typing import Any, Dict, List, Optional
from django.http import HttpRequest, HttpResponse
from django.views import View
from structlog import get_logger
from passbook.lib.utils.time import timedelta_from_string
from passbook.providers.oauth2.constants import (
GRANT_TYPE_AUTHORIZATION_CODE,
GRANT_TYPE_REFRESH_TOKEN,
)
from passbook.providers.oauth2.errors import TokenError, UserAuthError
from passbook.providers.oauth2.models import (
AuthorizationCode,
OAuth2Provider,
RefreshToken,
)
from passbook.providers.oauth2.utils import TokenResponse, extract_client_auth
LOGGER = get_logger()
@dataclass
# pylint: disable=too-many-instance-attributes
class TokenParams:
"""Token params"""
client_id: str
client_secret: str
redirect_uri: str
grant_type: str
state: str
scope: List[str]
authorization_code: Optional[AuthorizationCode] = None
refresh_token: Optional[RefreshToken] = None
code_verifier: Optional[str] = None
raw_code: InitVar[str] = ""
raw_token: InitVar[str] = ""
@staticmethod
def from_request(request: HttpRequest) -> "TokenParams":
"""Extract Token Parameters from http request"""
client_id, client_secret = extract_client_auth(request)
return TokenParams(
client_id=client_id,
client_secret=client_secret,
redirect_uri=request.POST.get("redirect_uri", ""),
grant_type=request.POST.get("grant_type", ""),
raw_code=request.POST.get("code", ""),
raw_token=request.POST.get("refresh_token", ""),
state=request.POST.get("state", ""),
scope=request.POST.get("scope", "").split(),
# PKCE parameter.
code_verifier=request.POST.get("code_verifier"),
)
def __post_init__(self, raw_code, raw_token):
try:
provider: OAuth2Provider = OAuth2Provider.objects.get(
client_id=self.client_id
)
self.provider = provider
except OAuth2Provider.DoesNotExist:
LOGGER.warning("OAuth2Provider does not exist", client_id=self.client_id)
raise TokenError("invalid_client")
if self.provider.client_type == "confidential":
if self.provider.client_secret != self.client_secret:
LOGGER.warning(
"Invalid client secret: client does not have secret",
client_id=self.provider.client_id,
secret=self.provider.client_secret,
)
raise TokenError("invalid_client")
if self.grant_type == GRANT_TYPE_AUTHORIZATION_CODE:
self.__post_init_code(raw_code)
elif self.grant_type == GRANT_TYPE_REFRESH_TOKEN:
if not raw_token:
LOGGER.warning("Missing refresh token")
raise TokenError("invalid_grant")
try:
self.refresh_token = RefreshToken.objects.get(
refresh_token=raw_token, client=self.provider
)
except RefreshToken.DoesNotExist:
LOGGER.warning(
"Refresh token does not exist", token=raw_token,
)
raise TokenError("invalid_grant")
else:
LOGGER.warning("Invalid grant type", grant_type=self.grant_type)
raise TokenError("unsupported_grant_type")
def __post_init_code(self, raw_code):
if not raw_code:
LOGGER.warning("Missing authorization code")
raise TokenError("invalid_grant")
if self.redirect_uri not in self.provider.redirect_uris.split():
LOGGER.warning(
"Invalid redirect uri",
uri=self.redirect_uri,
expected=self.provider.redirect_uris.split(),
)
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raise TokenError("invalid_client")
try:
self.authorization_code = AuthorizationCode.objects.get(code=raw_code)
except AuthorizationCode.DoesNotExist:
LOGGER.warning("Code does not exist", code=raw_code)
raise TokenError("invalid_grant")
if (
self.authorization_code.provider != self.provider
or self.authorization_code.is_expired
):
LOGGER.warning("Invalid code: invalid client or code has expired")
raise TokenError("invalid_grant")
# Validate PKCE parameters.
if self.code_verifier:
if self.authorization_code.code_challenge_method == "S256":
new_code_challenge = (
urlsafe_b64encode(
sha256(self.code_verifier.encode("ascii")).digest()
)
.decode("utf-8")
.replace("=", "")
)
else:
new_code_challenge = self.code_verifier
if new_code_challenge != self.authorization_code.code_challenge:
LOGGER.warning("Code challenge not matching")
raise TokenError("invalid_grant")
class TokenView(View):
"""Generate tokens for clients"""
params: TokenParams
def post(self, request: HttpRequest) -> HttpResponse:
"""Generate tokens for clients"""
try:
self.params = TokenParams.from_request(request)
if self.params.grant_type == GRANT_TYPE_AUTHORIZATION_CODE:
return TokenResponse(self.create_code_response_dic())
if self.params.grant_type == GRANT_TYPE_REFRESH_TOKEN:
return TokenResponse(self.create_refresh_response_dic())
raise ValueError(f"Invalid grant_type: {self.params.grant_type}")
except TokenError as error:
return TokenResponse(error.create_dict(), status=400)
except UserAuthError as error:
return TokenResponse(error.create_dict(), status=403)
def create_code_response_dic(self) -> Dict[str, Any]:
"""See https://tools.ietf.org/html/rfc6749#section-4.1"""
refresh_token = self.params.authorization_code.provider.create_refresh_token(
user=self.params.authorization_code.user,
scope=self.params.authorization_code.scope,
)
if self.params.authorization_code.is_open_id:
id_token = refresh_token.create_id_token(
user=self.params.authorization_code.user, request=self.request,
)
id_token.nonce = self.params.authorization_code.nonce
id_token.at_hash = refresh_token.at_hash
refresh_token.id_token = id_token
# Store the token.
refresh_token.save()
# We don't need to store the code anymore.
self.params.authorization_code.delete()
response_dict = {
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"access_token": refresh_token.access_token,
"refresh_token": refresh_token.refresh_token,
"token_type": "Bearer",
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"expires_in": timedelta_from_string(
self.params.provider.token_validity
).seconds,
"id_token": refresh_token.provider.encode(refresh_token.id_token.to_dict()),
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}
if self.params.authorization_code.is_open_id:
# This seems to be expected by some OIDC Clients
# namely VMware vCenter. This is not documented in any OpenID or OAuth2 Standard.
# Maybe this should be a setting
# in the future?
response_dict["access_token"] = response_dict["id_token"]
return response_dict
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def create_refresh_response_dic(self) -> Dict[str, Any]:
"""See https://tools.ietf.org/html/rfc6749#section-6"""
unauthorized_scopes = set(self.params.scope) - set(
self.params.refresh_token.scope
)
if unauthorized_scopes:
raise TokenError("invalid_scope")
refresh_token = self.params.refresh_token.provider.create_token(
user=self.params.refresh_token.user,
provider=self.params.refresh_token.provider,
scope=self.params.scope,
)
# If the Token has an id_token it's an Authentication request.
if self.params.refresh_token.id_token:
refresh_token.id_token = refresh_token.create_id_token(
user=self.params.refresh_token.user, request=self.request,
)
refresh_token.id_token.at_hash = refresh_token.at_hash
# Store the refresh_token.
refresh_token.save()
# Forget the old token.
self.params.refresh_token.delete()
dic = {
"access_token": refresh_token.access_token,
"refresh_token": refresh_token.refresh_token,
"token_type": "bearer",
"expires_in": timedelta_from_string(
refresh_token.provider.token_validity
).seconds,
"id_token": self.params.provider.encode(
self.params.refresh_token.id_token.to_dict()
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),
}
return dic