Help Center/ Huawei Cloud Astro Zero/ API Reference/ Permissions and Supported Actions/ Introduction
Updated on 2025-11-19 GMT+08:00
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Introduction

You can use Identity and Access Management (IAM) for fine-grained permissions management of your Huawei Cloud Astro Zero resources. If your Huawei account does not need individual IAM users, you can skip this section.

With IAM, you can control access to specific resources by granting permissions to principals (IAM users, user groups, agencies or trust agencies). IAM supports role/policy-based authorization and identity policy-based authorization.

The following table describes the differences between these two authorization models.

Table 1 Differences between role/policy-based and identity policy-based authorization

Name

Core Relationship

Permission

Authorization Method

Scenario

Role/Policy-based authorization

User-permission-authorization scope
  • System-defined role
  • System policy
  • Custom policy

Assigning roles or policies to principals

To authorize a user, you need to add it to a user group first and then specify the scope of authorization. It provides a limited number of condition keys and cannot meet the requirements of fine-grained permissions control. This method is suitable for small- and medium-sized enterprises.

Identity policy-based authorization

User-policy
  • System-defined identity policy
  • Custom identity policy
  • Assigning identity policies to principals
  • Attaching identity policies to principals

You can authorize a user by attaching an identity policy to it. User-specific authorization and a variety of key conditions allow for more fine-grained permissions control. However, this model can be hard to set up. It requires a certain amount of expertise and is suitable for medium- and large-sized enterprises.

Policies/Identity policies and actions in the two authorization models are not interoperable. You are advised to use the identity policy-based authorization model.

If you use IAM users in your account to call an API, the IAM users must be granted the required permissions. The required permissions are determined by the actions supported by the API. Only users with the policies allowing for those actions can call the API successfully.

Assume that an IAM user wants to view the instance list. With policy-based authorization, the IAM user must be granted the permissions allowing for action Astro Zero Instance ViewAccess. With identity policy-based authorization, the IAM user must be granted the permissions allowing for action astrozero:instances:get.