Authenticate to Azure Log Analytics Api using OAuth2.0 Client credentials

Question

I am trying to access my Azure app registered in Azure Active Directory(AAD). I am using the OAuth2.O Client credential protocol (https://dev.loganalytics.io/documentation/Authorization/OAuth2).

Using the Rest client (Postman) I am able to connect. But I need to do the same in my Java application.

There are 2 steps in connection

To get the access-token.

POST  https://login.microsoftonline.com/YOUR_AAD_TENANT/oauth2/token    
Content-Type: application/x-www-form-urlencoded

grant_type=client_credentials
&client_id=YOUR_CLIENT_ID
&redirect_uri=YOUR_REDIRECT_URI
&resource=https://management.azure.com/
&client_secret=YOUR_CLIENT_SECRET

To make a request to the workspace using the access token

POST https://api.loganalytics.io/v1/workspaces/8fXXXXX-0a84-XXX-XXX- c1a5XXXXXX/query?timespan=P1D

Authorization: Bearer [access_token]      
{
    "query": "AzureActivity | limit 10"
}

Can someone help me to write a java client to do above? I referred to the following links:

But they do not use the Tenant id and grant type not client_credentials.

Joy Wang-MSFT Joy Wang-MSFT · Accepted Answer · 2019-01-10T03:17:15

Try the code smaple as below, use authResult.getAccessToken() to get the access token, it should work.

import com.microsoft.aad.adal4j.AuthenticationContext;
import com.microsoft.aad.adal4j.AuthenticationResult;
import com.microsoft.aad.adal4j.ClientCredential; // for service principal

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

// Account specific values
String tenantId = <your tenant id>
String clientId = <your client id>
String password = <your password>

// use adal to Authenticate
AuthenticationContext authContext = null;
AuthenticationResult authResult = null;
ExecutorService service = null;

try {
    service = Executors.newFixedThreadPool(1);
    String url = "https://login.microsoftonline.com/" + tenantId + "/oauth2/authorize";
    authContext = new AuthenticationContext(url,
                                            false,
                                            service);
        ClientCredential clientCred = new ClientCredential(clientId, password);
        Future<AuthenticationResult>  future = authContext.acquireToken(
                                                        "https://management.azure.com/",
                                                        clientCred,
                                                        null);
    authResult = future.get();
} catch (Exception ex) {
    // handle exception as needed
} finally {
    service.shutdown();
}

For more details, see this link.

Authenticate to Azure Log Analytics Api using OAuth2.0 Client credentials

1 Answers