Introduction

This section describes fine-grained permissions management for your OBS. If your Huawei Cloud account does not require individual IAM users, skip this section.

By default, new IAM users do not have any 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.

For details about policies and roles related to OBS in IAM, see Permissions Management. For more information about the syntax structure and examples of IAM permissions, see IAM 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.
• Because of the cache, it takes about 10 to 15 minutes for the OBS role to take effect after being granted to users and user groups. After an OBS policy is granted, it takes about 5 minutes for the policy to take effect.

An account has all of the permissions required to call all APIs, but IAM users must have the required permissions specifically assigned. 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. For example, if an IAM user needs to create buckets using an API, the user must have been granted permissions that allow the obs:bucket:CreateBucket action.