Allow Authorization Code flow without a client_secret - Initial commi…

…t with Patch & testcases (#1276)

* Initial commit with Patch & testcases

* reference the RFC where empty client secret is allowed

---------

Co-authored-by: Alan Crosswell <alan@crosswell.us>

AUTHORS

@@ -9,6 +9,7 @@ Contributors
 
 Abhishek Patel
 Adam Johnson
+Adheeth P Praveen
 Alan Crosswell
 Alejandro Mantecon Guillen
 Aleksander Vaskevich

CHANGELOG.md

@@ -25,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * #1218 Confim support for Python 3.11.
 * #1222 Remove expired ID tokens alongside access tokens in `cleartokens` management command
 * #1270 Fix RP-initiated Logout with no available Django session
+* #1092 Allow Authorization Code flow without a client_secret per [RFC 6749 2.3.1](https://www.rfc-editor.org/rfc/rfc6749.html#section-2.3.1)
 
 ## [2.2.0] 2022-10-18
 

oauth2_provider/oauth2_validators.py

@@ -170,7 +170,7 @@ def _authenticate_request_body(self, request):
         # TODO: check if oauthlib has already unquoted client_id and client_secret
         try:
             client_id = request.client_id
-            client_secret = request.client_secret
+            client_secret = getattr(request, "client_secret", "")
         except AttributeError:
             return False
 

tests/test_oauth2_validators.py

@@ -30,6 +30,7 @@
 RefreshToken = get_refresh_token_model()
 
 CLEARTEXT_SECRET = "1234567890abcdefghijklmnopqrstuvwxyz"
+CLEARTEXT_BLANK_SECRET = ""
 
 
 @contextlib.contextmanager
@@ -61,11 +62,25 @@ def setUp(self):
         )
         self.request.client = self.application
 
+        self.blank_secret_request = mock.MagicMock(wraps=Request)
+        self.blank_secret_request.user = self.user
+        self.blank_secret_request.grant_type = "not client"
+        self.blank_secret_application = Application.objects.create(
+            client_id="blank_secret_client_id",
+            client_secret=CLEARTEXT_BLANK_SECRET,
+            user=self.user,
+            client_type=Application.CLIENT_PUBLIC,
+            authorization_grant_type=Application.GRANT_PASSWORD,
+        )
+        self.blank_secret_request.client = self.blank_secret_application
+
     def tearDown(self):
         self.application.delete()
 
     def test_authenticate_request_body(self):
         self.request.client_id = "client_id"
+        self.assertFalse(self.validator._authenticate_request_body(self.request))
+
         self.request.client_secret = ""
         self.assertFalse(self.validator._authenticate_request_body(self.request))
 
@@ -75,6 +90,15 @@ def test_authenticate_request_body(self):
         self.request.client_secret = CLEARTEXT_SECRET
         self.assertTrue(self.validator._authenticate_request_body(self.request))
 
+        self.blank_secret_request.client_id = "blank_secret_client_id"
+        self.assertTrue(self.validator._authenticate_request_body(self.blank_secret_request))
+
+        self.blank_secret_request.client_secret = CLEARTEXT_BLANK_SECRET
+        self.assertTrue(self.validator._authenticate_request_body(self.blank_secret_request))
+
+        self.blank_secret_request.client_secret = "wrong_client_secret"
+        self.assertFalse(self.validator._authenticate_request_body(self.blank_secret_request))
+
     def test_extract_basic_auth(self):
         self.request.headers = {"HTTP_AUTHORIZATION": "Basic 123456"}
         self.assertEqual(self.validator._extract_basic_auth(self.request), "123456")