Add ROPC support to Confidential Client

msal/application.py

@@ -1025,6 +1025,91 @@ def acquire_token_by_refresh_token(self, refresh_token, scopes, **kwargs):
         telemetry_context.update_telemetry(response)
         return response
 
+    def acquire_token_by_username_password(
+            self, username, password, scopes, claims_challenge=None, **kwargs):
+        """Gets a token for a given resource via user credentials.
+
+        See this page for constraints of Username Password Flow.
+        https://github.com/AzureAD/microsoft-authentication-library-for-python/wiki/Username-Password-Authentication
+
+        :param str username: Typically a UPN in the form of an email address.
+        :param str password: The password.
+        :param list[str] scopes:
+            Scopes requested to access a protected API (a resource).
+        :param claims_challenge:
+            The claims_challenge parameter requests specific claims requested by the resource provider
+            in the form of a claims_challenge directive in the www-authenticate header to be
+            returned from the UserInfo Endpoint and/or in the ID Token and/or Access Token.
+            It is a string of a JSON object which contains lists of claims being requested from these locations.
+
+        :return: A dict representing the json response from AAD:
+
+            - A successful response would contain "access_token" key,
+            - an error response would contain "error" and usually "error_description".
+        """
+        scopes = decorate_scope(scopes, self.client_id)
+        telemetry_context = self._build_telemetry_context(
+            self.ACQUIRE_TOKEN_BY_USERNAME_PASSWORD_ID)
+        headers = telemetry_context.generate_headers()
+        data = dict(
+            kwargs.pop("data", {}),
+            claims=_merge_claims_challenge_and_capabilities(
+                self._client_capabilities, claims_challenge))
+        if not self.authority.is_adfs:
+            user_realm_result = self.authority.user_realm_discovery(
+                username, correlation_id=headers[msal.telemetry.CLIENT_REQUEST_ID])
+            if user_realm_result.get("account_type") == "Federated":
+                response = _clean_up(self._acquire_token_by_username_password_federated(
+                    user_realm_result, username, password, scopes=scopes,
+                    data=data,
+                    headers=headers, **kwargs))
+                telemetry_context.update_telemetry(response)
+                return response
+        response = _clean_up(self.client.obtain_token_by_username_password(
+                username, password, scope=scopes,
+                headers=headers,
+                data=data,
+                **kwargs))
+        telemetry_context.update_telemetry(response)
+        return response
+
+    def _acquire_token_by_username_password_federated(
+            self, user_realm_result, username, password, scopes=None, **kwargs):
+        wstrust_endpoint = {}
+        if user_realm_result.get("federation_metadata_url"):
+            wstrust_endpoint = mex_send_request(
+                user_realm_result["federation_metadata_url"],
+                self.http_client)
+            if wstrust_endpoint is None:
+                raise ValueError("Unable to find wstrust endpoint from MEX. "
+                    "This typically happens when attempting MSA accounts. "
+                    "More details available here. "
+                    "https://github.com/AzureAD/microsoft-authentication-library-for-python/wiki/Username-Password-Authentication")
+        logger.debug("wstrust_endpoint = %s", wstrust_endpoint)
+        wstrust_result = wst_send_request(
+            username, password,
+            user_realm_result.get("cloud_audience_urn", "urn:federation:MicrosoftOnline"),
+            wstrust_endpoint.get("address",
+                # Fallback to an AAD supplied endpoint
+                user_realm_result.get("federation_active_auth_url")),
+            wstrust_endpoint.get("action"), self.http_client)
+        if not ("token" in wstrust_result and "type" in wstrust_result):
+            raise RuntimeError("Unsuccessful RSTR. %s" % wstrust_result)
+        GRANT_TYPE_SAML1_1 = 'urn:ietf:params:oauth:grant-type:saml1_1-bearer'
+        grant_type = {
+            SAML_TOKEN_TYPE_V1: GRANT_TYPE_SAML1_1,
+            SAML_TOKEN_TYPE_V2: self.client.GRANT_TYPE_SAML2,
+            WSS_SAML_TOKEN_PROFILE_V1_1: GRANT_TYPE_SAML1_1,
+            WSS_SAML_TOKEN_PROFILE_V2: self.client.GRANT_TYPE_SAML2
+            }.get(wstrust_result.get("type"))
+        if not grant_type:
+            raise RuntimeError(
+                "RSTR returned unknown token type: %s", wstrust_result.get("type"))
+        self.client.grant_assertion_encoders.setdefault(  # Register a non-standard type
+            grant_type, self.client.encode_saml_assertion)
+        return self.client.obtain_token_by_assertion(
+            wstrust_result["token"], grant_type, scope=scopes, **kwargs)
+
 
 class PublicClientApplication(ClientApplication):  # browser app or mobile app
 
@@ -1176,91 +1261,6 @@ def acquire_token_by_device_flow(self, flow, claims_challenge=None, **kwargs):
         telemetry_context.update_telemetry(response)
         return response
 
-    def acquire_token_by_username_password(
-            self, username, password, scopes, claims_challenge=None, **kwargs):
-        """Gets a token for a given resource via user credentials.
-
-        See this page for constraints of Username Password Flow.
-        https://github.com/AzureAD/microsoft-authentication-library-for-python/wiki/Username-Password-Authentication
-
-        :param str username: Typically a UPN in the form of an email address.
-        :param str password: The password.
-        :param list[str] scopes:
-            Scopes requested to access a protected API (a resource).
-        :param claims_challenge:
-            The claims_challenge parameter requests specific claims requested by the resource provider
-            in the form of a claims_challenge directive in the www-authenticate header to be
-            returned from the UserInfo Endpoint and/or in the ID Token and/or Access Token.
-            It is a string of a JSON object which contains lists of claims being requested from these locations.
-
-        :return: A dict representing the json response from AAD:
-
-            - A successful response would contain "access_token" key,
-            - an error response would contain "error" and usually "error_description".
-        """
-        scopes = decorate_scope(scopes, self.client_id)
-        telemetry_context = self._build_telemetry_context(
-            self.ACQUIRE_TOKEN_BY_USERNAME_PASSWORD_ID)
-        headers = telemetry_context.generate_headers()
-        data = dict(
-            kwargs.pop("data", {}),
-            claims=_merge_claims_challenge_and_capabilities(
-                self._client_capabilities, claims_challenge))
-        if not self.authority.is_adfs:
-            user_realm_result = self.authority.user_realm_discovery(
-                username, correlation_id=headers[msal.telemetry.CLIENT_REQUEST_ID])
-            if user_realm_result.get("account_type") == "Federated":
-                response = _clean_up(self._acquire_token_by_username_password_federated(
-                    user_realm_result, username, password, scopes=scopes,
-                    data=data,
-                    headers=headers, **kwargs))
-                telemetry_context.update_telemetry(response)
-                return response
-        response = _clean_up(self.client.obtain_token_by_username_password(
-                username, password, scope=scopes,
-                headers=headers,
-                data=data,
-                **kwargs))
-        telemetry_context.update_telemetry(response)
-        return response
-
-    def _acquire_token_by_username_password_federated(
-            self, user_realm_result, username, password, scopes=None, **kwargs):
-        wstrust_endpoint = {}
-        if user_realm_result.get("federation_metadata_url"):
-            wstrust_endpoint = mex_send_request(
-                user_realm_result["federation_metadata_url"],
-                self.http_client)
-            if wstrust_endpoint is None:
-                raise ValueError("Unable to find wstrust endpoint from MEX. "
-                    "This typically happens when attempting MSA accounts. "
-                    "More details available here. "
-                    "https://github.com/AzureAD/microsoft-authentication-library-for-python/wiki/Username-Password-Authentication")
-        logger.debug("wstrust_endpoint = %s", wstrust_endpoint)
-        wstrust_result = wst_send_request(
-            username, password,
-            user_realm_result.get("cloud_audience_urn", "urn:federation:MicrosoftOnline"),
-            wstrust_endpoint.get("address",
-                # Fallback to an AAD supplied endpoint
-                user_realm_result.get("federation_active_auth_url")),
-            wstrust_endpoint.get("action"), self.http_client)
-        if not ("token" in wstrust_result and "type" in wstrust_result):
-            raise RuntimeError("Unsuccessful RSTR. %s" % wstrust_result)
-        GRANT_TYPE_SAML1_1 = 'urn:ietf:params:oauth:grant-type:saml1_1-bearer'
-        grant_type = {
-            SAML_TOKEN_TYPE_V1: GRANT_TYPE_SAML1_1,
-            SAML_TOKEN_TYPE_V2: self.client.GRANT_TYPE_SAML2,
-            WSS_SAML_TOKEN_PROFILE_V1_1: GRANT_TYPE_SAML1_1,
-            WSS_SAML_TOKEN_PROFILE_V2: self.client.GRANT_TYPE_SAML2
-            }.get(wstrust_result.get("type"))
-        if not grant_type:
-            raise RuntimeError(
-                "RSTR returned unknown token type: %s", wstrust_result.get("type"))
-        self.client.grant_assertion_encoders.setdefault(  # Register a non-standard type
-            grant_type, self.client.encode_saml_assertion)
-        return self.client.obtain_token_by_assertion(
-            wstrust_result["token"], grant_type, scope=scopes, **kwargs)
-
 
 class ConfidentialClientApplication(ClientApplication):  # server-side web app
 

sample/username_password_sample.py

@@ -34,8 +34,9 @@
 config = json.load(open(sys.argv[1]))
 
 # Create a preferably long-lived app instance which maintains a token cache.
-app = msal.PublicClientApplication(
+app = msal.ClientApplication(
     config["client_id"], authority=config["authority"],
+    client_credential=config.get("client_secret"),
     # token_cache=...  # Default cache is in memory only.
                        # You can learn how to use SerializableTokenCache from
                        # https://msal-python.readthedocs.io/en/latest/#msal.SerializableTokenCache

tests/test_e2e.py

@@ -102,10 +102,12 @@ def assertCacheWorksForApp(self, result_from_wire, scope):
 
     def _test_username_password(self,
             authority=None, client_id=None, username=None, password=None, scope=None,
+            client_secret=None,  # Since MSAL 1.11, confidential client has ROPC too
             **ignored):
         assert authority and client_id and username and password and scope
-        self.app = msal.PublicClientApplication(
-            client_id, authority=authority, http_client=MinimalHttpClient())
+        self.app = msal.ClientApplication(
+            client_id, authority=authority, http_client=MinimalHttpClient(),
+            client_credential=client_secret)
         result = self.app.acquire_token_by_username_password(
             username, password, scopes=scope)
         self.assertLoosely(result)
@@ -650,6 +652,34 @@ def test_acquire_token_obo(self):
 
         self._test_acquire_token_obo(config_pca, config_cca)
 
+    def test_acquire_token_by_client_secret(self):
+        # This is copied from ArlingtonCloudTestCase's same test case
+        try:
+            config = self.get_lab_user(usertype="cloud", publicClient="no")
+        except requests.exceptions.HTTPError:
+            self.skipTest("The lab does not provide confidential app for testing")
+        else:
+            config["client_secret"] = self.get_lab_user_secret("TBD")  # TODO
+            self._test_acquire_token_by_client_secret(**config)
+
+    @unittest.skipUnless(
+        os.getenv("LAB_OBO_CLIENT_SECRET"),
+        "Need LAB_OBO_CLIENT_SECRET from https://aka.ms/GetLabSecret?Secret=TodoListServiceV2-OBO")
+    @unittest.skipUnless(
+        os.getenv("LAB_OBO_CONFIDENTIAL_CLIENT_ID"),
+        "Need LAB_OBO_CONFIDENTIAL_CLIENT_ID from https://docs.msidlab.com/flows/onbehalfofflow.html")
+    def test_confidential_client_acquire_token_by_username_password(self):
+        # This approach won't work:
+        #       config = self.get_lab_user(usertype="cloud", publicClient="no")
+        # so we repurpose the obo confidential app to test ROPC
+        config = self.get_lab_user(usertype="cloud")
+        config["password"] = self.get_lab_user_secret(config["lab_name"])
+        # Swap in the OBO confidential app
+        config["client_id"] = os.getenv("LAB_OBO_CONFIDENTIAL_CLIENT_ID")
+        config["scope"] = ["https://graph.microsoft.com/.default"]
+        config["client_secret"] = os.getenv("LAB_OBO_CLIENT_SECRET")
+        self._test_username_password(**config)
+
     def _build_b2c_authority(self, policy):
         base = "https://msidlabb2c.b2clogin.com/msidlabb2c.onmicrosoft.com"
         return base + "/" + policy  # We do not support base + "?p=" + policy