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Service-to-service authentication

  • [アーティクル]

Web APIs can acquire tokens in the name of a user, leveraging User assertions. Web API cannot have any user interaction, and therefore when a web API (named "Web API #1") needs to call another Web API (named "Web API #2") in the name of a user, it needs to use the On Behalf Of OAuth 2.0 flow.

This flow is a confidential client flow, and therefore the first web API provides client credentials (client secret or certificate), as well as an UserAssertion. The first web API will receive a bearer token and send it to Microsoft Entra ID by embedding it into a UserAssertion to request another token to the downstream second Web API.

// This is the confidential client application representing Web Api #1
ConfidentialClientApplication cca =
        ConfidentialClientApplication.builder(clientId, ClientCredentialFactory.create(CLIENT_SECRET)).
                authority(AUTHORITY).
                build();

// Create an UserAssertion with the access token received from the client application 
UserAssertion userAssertion = new UserAssertion(accessToken);

AuthenticationResult result =
        cca.acquireToken(
                OnBehalfOfParameters.builder(
                        Scope,             
                        userAssertion).
                        build()).
                        get();