Help Center> Scalable File Service> API Reference> Permissions Policies and Supported Actions> Introduction
Updated on 2024-01-03 GMT+08:00
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Introduction

This section describes fine-grained permissions management for your SFS resources. If your Huawei Cloud account does not need individual IAM users, then you may skip over this section.

By default, new IAM users do not have permissions assigned. You need to add a user to one or more groups, and attach permissions policies or roles to these groups. Users inherit permissions from the groups to which they are added and can perform specified operations on cloud services based on the permissions.

You can grant users permissions by using roles and policies. Roles are a type of coarse-grained authorization mechanism that defines permissions related to user responsibilities. Policies define API-based permissions for operations on specific resources under certain conditions, allowing for more fine-grained, secure access control of cloud resources.

  • Policy-based authorization is useful if you want to allow or deny the access to an API.

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions. The permissions required for calling an API are determined by the actions supported by the API. Only users who have been granted permissions allowing the actions can call the API successfully. For example, if an IAM user wants to query ECSs using an API, the user must have been granted permissions that allow the ecs:servers:list action.

Supported Actions

SFS provides system-defined policies that can be directly used in IAM. You can also create custom policies and use them to supplement system-defined policies, implementing more refined access control. Operations supported by policies are specific to APIs. The following are common concepts related to policies:

  • Permissions: Statements in a policy that allow or deny certain operations.
  • APIs: REST APIs that can be called by a user who has been granted specific permissions.
  • Actions: Specific operations that are allowed or denied.
  • Related actions: Actions on which a specific action depends to take effect. When assigning permissions for the action to a user, you also need to assign permissions for the related actions.
  • IAM projects/Enterprise projects: Authorization scope of a custom policy. A custom policy can be applied to IAM projects or enterprise projects or both. Policies that contain actions for both IAM and enterprise projects can be used and applied for both IAM and Enterprise Management. Policies that only contain actions for IAM projects can be used and applied to IAM only. For details about the differences between IAM and enterprise projects, see Differences Between IAM and Enterprise Management.

  • The check mark (√) and cross symbol (x) indicate that an action takes effect or does not take effect for the corresponding type of projects.

SFS supports the following actions that can be defined in custom policies:

  • Shared File Systems, including actions supported by all SFS file system APIs, such as the APIs for creating file systems, querying file system lists, querying details about a single file system, modifying file systems, and deleting file systems.
  • Capacity Expansion or Reduction, including actions supported by the SFS file system expanding and shrinking APIs, such as the APIs for expanding or shrinking a shared file system.
  • SFS Turbo Actions, including actions supported by all SFS Turbo file system APIs, such as the APIs for creating file systems, querying file system lists, querying details about a single file system, and deleting file systems.