224 lines
7.6 KiB
Python
224 lines
7.6 KiB
Python
from base64 import b64decode, urlsafe_b64encode
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import hashlib
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import logging
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import re
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try:
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from urllib.parse import unquote
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except ImportError:
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from urllib import unquote
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from django.http import JsonResponse
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from oidc_provider.lib.errors import (
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TokenError,
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)
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from oidc_provider.lib.utils.params import Params
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from oidc_provider.lib.utils.token import (
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create_id_token,
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create_token,
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encode_id_token,
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)
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from oidc_provider.models import (
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Client,
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Code,
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Token,
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)
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from oidc_provider import settings
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logger = logging.getLogger(__name__)
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class TokenEndpoint(object):
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def __init__(self, request):
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self.request = request
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self.params = Params()
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self._extract_params()
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def _extract_params(self):
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client_id, client_secret = self._extract_client_auth()
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self.params.client_id = client_id
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self.params.client_secret = client_secret
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self.params.redirect_uri = unquote(self.request.POST.get('redirect_uri', ''))
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self.params.grant_type = self.request.POST.get('grant_type', '')
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self.params.code = self.request.POST.get('code', '')
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self.params.state = self.request.POST.get('state', '')
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self.params.scope = self.request.POST.get('scope', '')
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self.params.refresh_token = self.request.POST.get('refresh_token', '')
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# PKCE parameters.
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self.params.code_verifier = self.request.POST.get('code_verifier')
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def _extract_client_auth(self):
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"""
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Get client credentials using HTTP Basic Authentication method.
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Or try getting parameters via POST.
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See: http://tools.ietf.org/html/rfc6750#section-2.1
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Return a string.
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"""
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auth_header = self.request.META.get('HTTP_AUTHORIZATION', '')
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if re.compile('^Basic\s{1}.+$').match(auth_header):
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b64_user_pass = auth_header.split()[1]
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try:
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user_pass = b64decode(b64_user_pass).decode('utf-8').split(':')
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client_id, client_secret = tuple(user_pass)
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except:
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client_id = client_secret = ''
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else:
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client_id = self.request.POST.get('client_id', '')
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client_secret = self.request.POST.get('client_secret', '')
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return (client_id, client_secret)
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def validate_params(self):
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try:
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self.client = Client.objects.get(client_id=self.params.client_id)
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except Client.DoesNotExist:
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logger.debug('[Token] Client does not exist: %s', self.params.client_id)
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raise TokenError('invalid_client')
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if self.client.client_type == 'confidential':
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if not (self.client.client_secret == self.params.client_secret):
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logger.debug('[Token] Invalid client secret: client %s do not have secret %s',
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self.client.client_id, self.client.client_secret)
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raise TokenError('invalid_client')
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if self.params.grant_type == 'authorization_code':
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if not (self.params.redirect_uri in self.client.redirect_uris):
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logger.debug('[Token] Invalid redirect uri: %s', self.params.redirect_uri)
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raise TokenError('invalid_client')
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try:
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self.code = Code.objects.get(code=self.params.code)
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except Code.DoesNotExist:
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logger.debug('[Token] Code does not exist: %s', self.params.code)
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raise TokenError('invalid_grant')
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if not (self.code.client == self.client) \
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or self.code.has_expired():
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logger.debug('[Token] Invalid code: invalid client or code has expired',
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self.params.redirect_uri)
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raise TokenError('invalid_grant')
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# Validate PKCE parameters.
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if self.params.code_verifier:
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if self.code.code_challenge_method == 'S256':
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new_code_challenge = urlsafe_b64encode(
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hashlib.sha256(self.params.code_verifier.encode('ascii')).digest()
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).decode('utf-8').replace('=', '')
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else:
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new_code_challenge = self.params.code_verifier
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# TODO: We should explain the error.
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if not (new_code_challenge == self.code.code_challenge):
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raise TokenError('invalid_grant')
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elif self.params.grant_type == 'refresh_token':
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if not self.params.refresh_token:
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logger.debug('[Token] Missing refresh token')
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raise TokenError('invalid_grant')
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try:
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self.token = Token.objects.get(refresh_token=self.params.refresh_token,
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client=self.client)
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except Token.DoesNotExist:
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logger.debug('[Token] Refresh token does not exist: %s', self.params.refresh_token)
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raise TokenError('invalid_grant')
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else:
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logger.debug('[Token] Invalid grant type: %s', self.params.grant_type)
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raise TokenError('unsupported_grant_type')
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def create_response_dic(self):
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if self.params.grant_type == 'authorization_code':
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return self.create_code_response_dic()
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elif self.params.grant_type == 'refresh_token':
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return self.create_refresh_response_dic()
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def create_code_response_dic(self):
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token = create_token(
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user=self.code.user,
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client=self.code.client,
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scope=self.code.scope)
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if self.code.is_authentication:
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id_token_dic = create_id_token(
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user=self.code.user,
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aud=self.client.client_id,
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nonce=self.code.nonce,
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at_hash=token.at_hash,
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request=self.request,
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scope=self.params.scope,
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)
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else:
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id_token_dic = {}
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token.id_token = id_token_dic
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# Store the token.
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token.save()
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# We don't need to store the code anymore.
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self.code.delete()
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dic = {
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'access_token': token.access_token,
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'refresh_token': token.refresh_token,
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'token_type': 'bearer',
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'expires_in': settings.get('OIDC_TOKEN_EXPIRE'),
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'id_token': encode_id_token(id_token_dic, token.client),
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}
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return dic
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def create_refresh_response_dic(self):
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token = create_token(
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user=self.token.user,
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client=self.token.client,
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scope=self.token.scope)
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# If the Token has an id_token it's an Authentication request.
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if self.token.id_token:
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id_token_dic = create_id_token(
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user=self.token.user,
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aud=self.client.client_id,
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nonce=None,
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at_hash=token.at_hash,
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request=self.request,
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scope=self.params.scope,
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)
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else:
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id_token_dic = {}
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token.id_token = id_token_dic
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# Store the token.
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token.save()
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# Forget the old token.
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self.token.delete()
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dic = {
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'access_token': token.access_token,
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'refresh_token': token.refresh_token,
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'token_type': 'bearer',
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'expires_in': settings.get('OIDC_TOKEN_EXPIRE'),
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'id_token': encode_id_token(id_token_dic, self.token.client),
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}
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return dic
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@classmethod
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def response(cls, dic, status=200):
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"""
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Create and return a response object.
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"""
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response = JsonResponse(dic, status=status)
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response['Cache-Control'] = 'no-store'
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response['Pragma'] = 'no-cache'
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return response
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