Java:无权执行 sts:AssumeRoleWithWebIdentity 认知用户池

Question

我正在使用 AWS Cogito 服务通过 AWS Java SDK 从 Cognito 获取用户凭证。

我关注了https://mobile.awsblog.com/post/TxBVEDL5Z8JKAC/Use-Amazon-Cognito-in-your-website-for-simple-AWS-authentication 编写代码以使用 cognito 对用户进行身份验证用户池。

在编写代码之前，我配置了 cognito 用户池，并使用以下池配置字段将其命名为 demo。

Pool Id us-east-1_GUbY6qQ1v
Pool ARN arn:aws:cognito-idp:us-east-1:049428796662:userpool/us-east-1_GUbY6qQ1v

我使用上面的内容和创建的身份池来满足联合身份池的需求，如附图所示。 Federated Identities User Pool

现在回到代码，我编写了以下函数来检索用户身份并将其缓存，以便如果相同的身份登录，则不会重复调用 GetID() 函数。

public UserIdentity getUserIdentity(User user) throws AuthorizationException {
if (user == null || user.getUsername() == null || user.getUsername().trim().equals("")) {
  throw new AuthorizationException("Invalid user");
}
AmazonCognitoIdentity identityClient = new AmazonCognitoIdentityClient(new AnonymousAWSCredentials());

GetIdRequest idRequest = new GetIdRequest();
idRequest.setAccountId(CognitoConfiguration.AWS_ACCOUNT_ID);
idRequest.setIdentityPoolId(CognitoConfiguration.IDENTITY_POOL_ID);

GetIdResult idResp = identityClient.getId(idRequest);

if (idResp == null) {
  throw new AuthorizationException("Empty GetOpenIdToken response");
}

GetOpenIdTokenRequest tokenRequest = new GetOpenIdTokenRequest();
tokenRequest.setIdentityId(idResp.getIdentityId());

GetOpenIdTokenResult tokenResp = identityClient.getOpenIdToken(tokenRequest);
UserIdentity identity = new UserIdentity();
identity.setIdentityId(idResp.getIdentityId());
identity.setOpenIdToken(tokenResp.getToken());
return identity;

}

用户类包含带有 getOpenIdToken 的字段标识，然后在向 cognito 请求凭据时检索此 token 。

public AWSSessionCredentials getUserCredentials(User user) throws AuthorizationException {
if (user == null || user.getCognitoIdentityId() == null || user.getCognitoIdentityId().trim().equals("")) {
  throw new AuthorizationException("Invalid user");
}

AWSSecurityTokenService stsClient = new AWSSecurityTokenServiceClient(new AnonymousAWSCredentials());
AssumeRoleWithWebIdentityRequest stsReq = new AssumeRoleWithWebIdentityRequest();
stsReq.setRoleArn(user.getUserRole());
System.out.println("The received get open id token is: " + user.getIdentity().getOpenIdToken());
stsReq.setWebIdentityToken(user.getIdentity().getOpenIdToken());
stsReq.setRoleSessionName("FassetTestSession");

AssumeRoleWithWebIdentityResult stsResp = stsClient.assumeRoleWithWebIdentity(stsReq);
Credentials stsCredentials = stsResp.getCredentials();

// Create the session credentials object
AWSSessionCredentials sessionCredentials = new BasicSessionCredentials(
    stsCredentials.getAccessKeyId(),
    stsCredentials.getSecretAccessKey(),
    stsCredentials.getSessionToken()
);
// save the timeout for these credentials 
Date sessionCredentialsExpiration = stsCredentials.getExpiration();
return sessionCredentials;

}

用户类的相关部分如下。

public class User {
  private UserIdentity identity;
  public String getCognitoIdentityId() {
    if (this.identity == null) {
      return null;
    }
    return this.identity.getIdentityId();
  }

  public void setCognitoIdentityId(String cognitoIdentityId) {
    if (this.identity == null) {
      this.identity = new UserIdentity();
    }
    this.identity.setIdentityId(cognitoIdentityId);
  }

}

AssumeRoleWithWebIdentityResult stsResp = stsClient.assumeRoleWithWebIdentity(stsReq) 行返回 403 禁止 错误，具体行如下。

    2016-10-13 17:47:02,330 DEBUG [wire(wire:72)] http-outgoing-4 << "<ErrorResponse xmlns="https://sts.amazonaws.com/doc/2011-06-15/">[\n]"
2016-10-13 17:47:02,330 DEBUG [wire(wire:72)] http-outgoing-4 << "  <Error>[\n]"
2016-10-13 17:47:02,330 DEBUG [wire(wire:72)] http-outgoing-4 << "    <Type>Sender</Type>[\n]"
2016-10-13 17:47:02,330 DEBUG [wire(wire:72)] http-outgoing-4 << "    <Code>AccessDenied</Code>[\n]"
2016-10-13 17:47:02,330 DEBUG [wire(wire:72)] http-outgoing-4 << "    <Message>Not authorized to perform sts:AssumeRoleWithWebIdentity</Message>[\n]"
2016-10-13 17:47:02,330 DEBUG [wire(wire:72)] http-outgoing-4 << "  </Error>[\n]"
2016-10-13 17:47:02,330 DEBUG [wire(wire:72)] http-outgoing-4 << "  <RequestId>fe4edd9f-913e-11e6-85cd-45155b40299e</RequestId>[\n]"

用户角色的信任权限为:

   {
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Federated": "cognito-identity.amazonaws.com"
      },
      "Action": "sts:AssumeRoleWithWebIdentity",
      "Condition": {
        "StringEquals": {
          "cognito-identity.amazonaws.com:aud": "us-east-1:xxxxxxxxxxxxxxxx"
        },
        "ForAnyValue:StringLike": {
          "cognito-identity.amazonaws.com:amr": [
            "accounts.google.com",
            "graph.facebook.com",
            "authenticated"
          ]
        }
      }
    }
  ]
}

其中 us-east-1:xxxxxxxxxxxxxxxx 是管理社交和认知用户池的用户身份池 ID。

我已经浏览了许多列出信任权限和认知用户池的此类博客来了解上述问题，但徒劳无功，如果有人可以帮助我解决上述问题，我将非常感激。

Answer 1

您没有在调用 GetId 时在登录映射中传递用户池用户的 ID token 。您需要使用包含 cognito-idp.us-east-1.amazonaws.com/us-east-1_your_user_pool_id 作为键和您的用户id token 池用户作为值

由于您尚未通过此登录映射，因此您获得的身份是未经身份验证的身份，并且您的角色策略中仅允许经过身份验证的用户。

另请参阅:GetId API