403 尝试对提供的字节进行签名：调用者没有权限

Question

POM文件详细信息：

      <dependency>
    <groupId>com.google.auth</groupId>
    <artifactId>google-auth-library-appengine</artifactId>
</dependency>

1.2.4.发布

jar 中包含的库：第 643 行：步骤 #0：[INFO] 从中心下载： https: //repo.maven.apache.org/maven2/com/google/auth/google-auth-library-oauth2-http/0.21 .1/google-auth-library-oauth2-http-0.21.1.pom 第 643 行：步骤 #0：[INFO] 从中心下载： https: //repo.maven.apache.org/maven2/com/google/ auth/google-auth-library-oauth2-http/0.21.1/google-auth-library-oauth2-http-0.21.1.pom

环境详情

• 操作系统： Debian
• Java版本：11
• google-auth-library-java 版本：0.21.1

重现步骤

• 上传GCS存储桶中的文件。
• 尝试使用下面给出的代码下载它。堆栈跟踪

com.google.auth.ServiceAccountSigner$SigningException: Failed to sign the provided bytes
at com.google.auth.oauth2.IamUtils.sign(IamUtils.java:87)
at com.google.auth.oauth2.ComputeEngineCredentials.sign(ComputeEngineCredentials.java:361)
at com.google.cloud.storage.StorageImpl.signUrl(StorageImpl.java:772)
at com.google.cloud.storage.Blob.signUrl(Blob.java:822)

Caused by: java.io.IOException: Error code 403 trying to sign provided bytes: The caller does not have permission
at com.google.auth.oauth2.IamUtils.getSignature(IamUtils.java:125)
at com.google.auth.oauth2.IamUtils.sign(IamUtils.java:84)
... 69 more

代码片段

// [START auth_cloud_explicit_compute_engine]
public Storage authCompute() throws IOException {
// Explicitly request service account credentials from the compute engine
// instance.
//GoogleCredentials credentials = ComputeEngineCredentials.create();
GoogleCredentials credentials = ComputeEngineCredentials.getApplicationDefault();
Storage storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService();

    System.out.println("Buckets:");
    Page<Bucket> buckets = storage.list();
    for (Bucket bucket : buckets.iterateAll()) {
        System.out.println(bucket.toString());
    }
    return storage;
}
// [END auth_cloud_explicit_compute_engine]
Storage storage = authUtil.authCompute();
Blob blob = storage.get(BlobId.of(bucketName, objectName));
return blob.signUrl(urlExpirationTime, TimeUnit.MILLISECONDS);

我的应用程序部署在 GKE 上。从那里我们尝试下载/获取存储在 GCS 中的文件的签名 url。

Answer 1

ComputeEngineCredentials 使用 IAM 签名 blob API 调用，因此所使用的服务帐户需要具有 iam.serviceAccounts.signBlob 权限。根据您的设置，这可能是 GKE 或工作负载身份的默认服务帐号。