In OpenID Connect (OIDC), the choice between the Client Credentials and Authorization Code flows depends on the type of application and the use case. Here's a breakdown of when to use each:
Client Credentials Flow - When to Use:
- The application is a server-to-server application (e.g., backend service or API).
- No user interaction is required.
- The application needs to authenticate itself to access resources or APIs on behalf of itself, not a user.
Examples:
- Machine-to-machine API calls.
- Backend microservices communicating with each other.
Key Characteristics:
Only the client_id and client_secret are used to obtain an access token.
No user context is involved.
Authorization Code Flow - When to Use:
- The application requires user interaction and wants to access user-protected resources.
- Typically used by web applications and native applications that act on behalf of the user.
- The application needs a high level of security, such as obtaining a refresh token or delegating user-specific actions.
Key Characteristics:
- Involves a user logging in and consenting to the application accessing their data.
- Includes a code exchange process where the application gets an authorization code and exchanges it for an access token.
- Ensures sensitive information (e.g., client_secret) isn't exposed in the browser.
Summary of Use Cases
If your application involves users logging in and granting permissions, go with the Authorization Code flow.
If it's just a backend system communicating with another system, the Client Credentials flow is the right choice.
Example of security policy: Oauth Client credential added to OIC connection:
Connextion name: Conn_REST_<target>_TriggerInvoke_OAuth
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