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Type to learn 3 client12/29/2023 ![]() The API then checks the ACL for the test client's application ID for full access to the API's entire functionality. To run end-to-end tests on the API, you can create a test client that acquires tokens from the Microsoft identity platform and then sends them to the API. The web API might grant only a subset of full permissions to a specific client. ![]() The ACL's granularity and method might vary substantially between resources.Ī common use case is to use an ACL to run tests for a web application or for a web API. Then it compares the application against an access control list (ACL) that it maintains. When the resource receives a token from the Microsoft identity platform, it can decode the token and extract the client's application ID from the appid and iss claims. Access control listsĪ resource provider might enforce an authorization check based on a list of application (client) IDs that it knows and grants a specific level of access to. Each resource server can choose the method that makes the most sense for its application. A resource can also choose to authorize its clients in other ways. These two methods are the most common in Microsoft Entra ID and we recommend them for clients and resources that perform the client credentials flow. Through application permission assignment in Microsoft Entra ID.Through an access control list (ACL) at the resource.We describe each of the steps later in this article.Īn app typically receives direct authorization to access a resource in one of two ways: The entire client credentials flow looks similar to the following diagram. Try executing this request and more in Postman - don't forget to replace tokens and IDs! Protocol diagram Never publish that credential in your source code, embed it in web pages, or use it in a widely distributed native application. Because the application's own credentials are being used, these credentials must be kept safe. As a side note, refresh tokens will never be granted with this flow as client_id and client_secret (which would be required to obtain a refresh token) can be used to obtain an access token instead.įor a higher level of assurance, the Microsoft identity platform also allows the calling service to authenticate using a certificate or federated credential instead of a shared secret. You can also refer to the sample apps that use MSAL. When possible, we recommend you use the supported Microsoft Authentication Libraries (MSAL) instead to acquire tokens and call secured web APIs. This article describes how to program directly against the protocol in your application. How to get the tokens needed to call that API. ![]() Authorize an application to call an API.This article covers both the steps needed to: When the app presents a token to a resource, the resource enforces that the app itself has authorization to perform an action since there is no user involved in the authentication. In the client credentials flow, permissions are granted directly to the application itself by an administrator. ![]() This type is commonly used for server-to-server interactions that must run in the background, without immediate interaction with a user, and is often referred to as daemons or service accounts. The grant specified in RFC 6749, sometimes called two-legged OAuth, can be used to access web-hosted resources by using the identity of an application. The OAuth 2.0 client credentials grant flow permits a web service (confidential client) to use its own credentials, instead of impersonating a user, to authenticate when calling another web service.
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