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【Azure Developer】使用 adal4j(Azure Active Directory authentication library for Java)如何来获取

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问题描述 使用中国区的Azure,在获取Token时候,参考了 adal4j的代码,在官方文档中,发现了如下的片段代码: ExecutorService service = Executors.newFixedThreadPool(1 );AuthenticationContext context = new
问题描述

使用中国区的Azure,在获取Token时候,参考了 adal4j的代码,在官方文档中,发现了如下的片段代码:

ExecutorService service = Executors.newFixedThreadPool(1);
AuthenticationContext context = new AuthenticationContext(AUTHORITY, false, service);
Future<AuthenticationResult> future = context.acquireToken(
    "https://graph.windows.net", YOUR_TENANT_ID, username, password,
    null);
AuthenticationResult result = future.get();
System.out.println("Access Token - " + result.getAccessToken());
System.out.println("Refresh Token - " + result.getRefreshToken());
System.out.println("ID Token - " + result.getIdToken());

以上代码中,有一些参数很不明确:

1)AUTHORITY, 是什么意思呢?

2)acquireTokne方法中的 https://graph.windows.net 是指向global azure的资源,如果是中国区azure的资源,那么resource url是多少呢?

3)YOUR_TENANT_ID,它的值是什么呢?

 

问题解答 第一个问题:AUTHORITY, 是什么意思,它的值是什么呢?

AUTHORITY,表示认证的主体,它是一个URL,表示可以从该主体中获取到认证Token。 它的格式为:https://<authority host>/<tenant id> ,所以在使用Azure的过程中,根据Azure环境的不同,Host 有以下四个值。

  1. AzureChina :The host of the Azure Active Directory authority for tenants in the Azure China Cloud.  AZURE_CHINA "login.chinacloudapi.cn"
  2. AzureGermany: The host of the Azure Active Directory authority for tenants in the Azure German Cloud.  AZURE_GERMANY "login.microsoftonline.de"
  3. AzureGovernment: The host of the Azure Active Directory authority for tenants in the Azure US Government Cloud.  AZURE_GOVERNMENT "login.microsoftonline.us"
  4. AzurePublicCloud: The host of the Azure Active Directory authority for tenants in the Azure Public Cloud. AZURE_PUBLIC_CLOUD "login.microsoftonline.com"

所以,这里我们需要使用的值为:String AUTHORITY = "https://login.chinacloudapi.cn/<tenant id >";  

那么如何来获取Tenant ID呢? 

登录到Azure门户 --> 进入AAD中,在Overview页面查看Tenant ID (https://portal.azure.cn/#blade/Microsoft_AAD_IAM/ActiveDirectoryMenuBlade/Overview)

 

第二个问题:acquireTokne方法中的 https://graph.windows.net 是指向global azure的资源,如果是中国区azure的资源,那么resource url是多少呢?

根据中国区Azure的开发文档,并没有查找到对应于 graph.windows.net的中国区Graph 终结点。但是,中国区Graph 的终结点为:microsoftgraph.chinacloudapi.cn,所以,以上示例中应该使用的值应是:

https://microsoftgraph.chinacloudapi.cn/ (Source: https://docs.microsoft.com/en-us/azure/china/resources-developer-guide#check-endpoints-in-azure)

 

第三个问题:YOUR_TENANT_ID,它的值是什么呢?

在对比了adal4j的源代码后,在acquireToken方法定义中,发现YOUR_TENANT_ID所对应的值应该是 clientId ()。所以,官网参考文档中的YOUR_TENANT_ID存在误导情景。需要修改为YOUR_CLIENT_ID。

ADAL4J中acquireToken源码(acquireToken有多个重载,但此处只列举出代码中使用的这个重载)

    /**
     * Acquires a security token from the authority using a Refresh Token
     * previously received.
     *
     * @param clientId
     *            Name or ID of the client requesting the token.
     * @param resource
     *            Identifier of the target resource that is the recipient of the
     *            requested token. If null, token is requested for the same
     *            resource refresh token was originally issued for. If passed,
     *            resource should match the original resource used to acquire
     *            refresh token unless token service supports refresh token for
     *            multiple resources.
     * @param username
     *            Username of the managed or federated user.
     * @param password
     *            Password of the managed or federated user.
     * @param callback
     *            optional callback object for non-blocking execution.
     * @return A {@link Future} object representing the
     *         {@link AuthenticationResult} of the call. It contains Access
     *         Token, Refresh Token and the Access Token's expiration time.
     */
    public Future<AuthenticationResult> acquireToken(final String resource,
            final String clientId, final String username,
            final String password, final AuthenticationCallback callback) {
        if (StringHelper.isBlank(resource)) {
            throw new IllegalArgumentException("resource is null or empty");
        }

        if (StringHelper.isBlank(clientId)) {
            throw new IllegalArgumentException("clientId is null or empty");
        }

        if (StringHelper.isBlank(username)) {
            throw new IllegalArgumentException("username is null or empty");
        }

        if (StringHelper.isBlank(password)) {
            throw new IllegalArgumentException("password is null or empty");
        }

        return this.acquireToken(new AdalAuthorizatonGrant(
                new ResourceOwnerPasswordCredentialsGrant(username, new Secret(
                        password)), resource), new ClientAuthenticationPost(
                ClientAuthenticationMethod.NONE, new ClientID(clientId)),
                callback);
    }

所以,这里指定的Client ID 其实是,AAD中所注册的一个应用(服务主体),而这个主体可以根据需求授予不同的权限,acquireToken就是根据用户验证成功后,生成这个主题所拥有的权限JWT令牌(Token),获取到Token后,就拥有了访问Azure中资源API的授权.

如何来获取这个Client ID呢?
  • 进入AAD, 选择注册应用( App Registrations:https://portal.azure.cn/#blade/Microsoft_AAD_IAM/ActiveDirectoryMenuBlade/RegisteredApps) 
  • 并在Onwed Applications 中选择,进入详细页面或就是当前页面,获取Application(Client) ID

 

特别注意:这个App必须开启 “Allow public client flows“ 才能成功获取到 Token。 默认情况下,这里选择的是No。 如果不开启这一步,将会收到错误消息:"error_description":"AADSTS7000218: The request body must contain the following parameter: 'client_assertion' or 'client_secret'.

开启方式为:点击这个App的名称,进入详细页面,选择Authentication,滑动到最底部,选择“Allow public client flows”。

完成参考实例代码 1:在POM.XML文件中添加adal4j依赖
    <dependency>
      <groupId>com.microsoft.azure</groupId>
      <artifactId>adal4j</artifactId>
      <version>1.2.0</version>
  </dependency>
2:示例代码
package com.example;

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

import com.microsoft.aad.adal4j.AuthenticationContext;
import com.microsoft.aad.adal4j.AuthenticationResult;

/**
 * Hello world!
 *
 */
public class App {
    public static void main(String[] args) throws InterruptedException, ExecutionException, MalformedURLException {
        System.out.println("Hello World!");

        ExecutorService service = Executors.newFixedThreadPool(1);
        String AUTHORITY = "https://login.chinacloudapi.cn/<tenant id >"; // AzureAuthority 
   
        String YOUR_Client_ID="7b61c392-xxxx-xxxx-xxxx-xxxxxxxxxxx";
        String username = "xxxx@xxxx.xxx.onmschina.cn";
        String password = "xxxxxxxxxxx";
        AuthenticationContext context = new AuthenticationContext(AUTHORITY, false, service);
        Future<AuthenticationResult> future = context.acquireToken("https://microsoftgraph.chinacloudapi.cn/", YOUR_Client_ID,
                username, password, null);
        AuthenticationResult result = future.get();

        System.out.println("Access Token - " + result.getAccessToken());
        System.out.println("Refresh Token - " + result.getRefreshToken());
        System.out.println("ID Token - " + result.getIdToken());

    }
}

(PS: 使用的 username, password就是登录Azure的用户名和密码

测试结果:

 

获取Token成功。

可以通过一个公用网站 jwt.io 来解析Token: https://jwt.io/, 它可以解析出Token内容,让我们可读。

 

 

参考资料

Azure China developer guide:https://docs.microsoft.com/en-us/azure/china/resources-developer-guide#check-endpoints-in-azure

Authority: https://docs.microsoft.com/en-us/azure/active-directory/develop/msal-client-application-configuration#authority   Authority Value: https://azuresdkdocs.blob.core.windows.net/$web/python/azure-identity/1.4.0/_modules/azure/identity/_constants.html#AzureAuthorityHosts

Azure Active Directory libraries for Java: https://docs.microsoft.com/en-us/java/api/overview/azure/activedirectory?view=azure-java-stable#client-library

 

当在复杂的环境中面临问题,格物之道需:浊而静之徐清,安以动之徐生。 云中,恰是如此!

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