Updated on 2023-08-01 GMT+08:00

Permissions Management

You can use Identity and Access Management (IAM) to manage OBS permissions and control access to your resources. IAM provides identity authentication, permissions management, and access control.

You can create IAM users for your employees, and assign permissions to these users on a principle of least privilege (PoLP) basis to control their access to specific resource types. For example, you can create IAM users for software developers and assign specific permissions to allow them to use OBS resources but prevent them from being able to delete resources or perform any high-risk operations.

If your Huawei Cloud account does not require individual IAM users for permissions management, skip this section.

IAM is offered for free. You pay only for the resources in your account. For more information about IAM, see What Is IAM?

OBS Permissions

By default, new IAM users do not have any permissions assigned. You can assign permissions to these users by adding them to one or more groups and attaching policies or roles to the groups.

OBS is a global service deployed and accessed without specifying any physical region. OBS permissions are assigned to users in the global project, and users do not need to switch regions when accessing OBS.

You can grant users permissions by using roles or policies.

  • Roles: A type of coarse-grained authorization mechanism that provides only a limited number of service-level roles. When using roles to grant permissions, you also need to assign dependency roles. However, roles are not an ideal choice for fine-grained authorization and secure access control.
  • Policies: A type of fine-grained authorization mechanism that defines permissions required to perform operations on specific cloud resources under certain conditions. This mechanism allows for more flexible policy-based authorization for secure access control. For example, you can grant OBS users only the permissions for managing a certain type of OBS resources. Most policies define permissions based on APIs. For the API actions supported by OBS, see Permissions and Supported Actions.

Due to data caching, a role and policy involving OBS actions will take effect 10 to 15 minutes after it is attached to a user and a user group.

Table 1 lists all system permissions of OBS.

Table 1 OBS system permissions

Role/Policy Name

Description

Type

Dependency

Tenant Administrator

Allows you to perform all operations on all services except IAM.

System-defined role

None

Tenant Guest

Allows you to perform read-only operations on all services except IAM.

System-defined role

None

OBS Administrator

Allows you to perform any operation on all OBS resources under the account.

System-defined policy

None

OBS Buckets Viewer

Allows you to list buckets, and obtain basic bucket information and bucket metadata.

System-defined role

None

OBS ReadOnlyAccess

Allows you to list buckets, obtain basic bucket information and bucket metadata, and list objects (excluding versioned objects).

NOTE:

If a user with this permission fails to list objects on OBS Console, there may be multiple versions of objects in the bucket. In this case, you need to grant the user the obs:bucket:ListBucketVersions permission so that the user can view different versions of objects on OBS Console.

System-defined policy

None

OBS OperateAccess

Allows you to perform all operations defined in OBS ReadOnlyAccess and to perform basic object operations, such as uploading objects, downloading objects, deleting objects, and obtaining object ACLs.

NOTE:

If a user with this permission fails to list objects on OBS Console, there may be multiple versions of objects in the bucket. In this case, you need to grant the user the obs:bucket:ListBucketVersions permission so that the user can view different versions of objects on OBS Console.

System-defined policy

None

Table 2 lists the common operations supported by each system-defined policy or role of OBS. Select the policies or roles as required.

Table 2 Permissions and the allowed operations on OBS resources

Operation

Tenant Administrator

Tenant Guest

OBS Administrator

OBS Buckets Viewer

OBS ReadOnlyAccess

OBS OperateAccess

Listing buckets

Yes

Yes

Yes

Yes

Yes

Yes

Creating buckets

Yes

No

Yes

No

No

No

Deleting buckets

Yes

No

Yes

No

No

No

Obtaining basic bucket information

Yes

Yes

Yes

Yes

Yes

Yes

Controlling bucket access

Yes

No

Yes

No

No

No

Managing bucket policies

Yes

No

Yes

No

No

No

Modifying bucket storage classes

Yes

No

Yes

No

No

No

Listing objects

Yes

Yes

Yes

No

Yes

Yes

Listing objects with multiple versions

Yes

Yes

Yes

No

No

No

Uploading files

Yes

No

Yes

No

No

Yes

Creating folders

Yes

No

Yes

No

No

Yes

Deleting files

Yes

No

Yes

No

No

Yes

Deleting folders

Yes

No

Yes

No

No

Yes

Downloading files

Yes

Yes

Yes

No

No

Yes

Deleting files with multiple versions

Yes

No

Yes

No

No

Yes

Downloading files with multiple versions

Yes

Yes

Yes

No

No

Yes

Modifying object storage classes

Yes

No

Yes

No

No

No

Restoring files

Yes

No

Yes

No

No

No

Canceling the deletion of files

Yes

No

Yes

No

No

Yes

Deleting fragments

Yes

No

Yes

No

No

Yes

Controlling object access

Yes

No

Yes

No

No

No

Configuring object metadata

Yes

No

Yes

No

No

No

Obtaining object metadata

Yes

Yes

Yes

No

No

Yes

Managing versioning

Yes

No

Yes

No

No

No

Managing logging

Yes

No

Yes

No

No

No

Managing tags

Yes

No

Yes

No

No

No

Managing lifecycle rules

Yes

No

Yes

No

No

No

Managing static website hosting

Yes

No

Yes

No

No

No

Managing CORS rules

Yes

No

Yes

No

No

No

Managing URL validation

Yes

No

Yes

No

No

No

Managing domain names

Yes

No

Yes

No

No

No

Appending objects

Yes

No

Yes

No

No

Yes

Configuring object ACL

Yes

No

Yes

No

No

No

Configuring the ACL for an object of a specified version

Yes

No

Yes

No

No

No

Obtaining object ACL information

Yes

Yes

Yes

No

No

Yes

Obtaining the ACL information of a specified object version

Yes

Yes

Yes

No

No

Yes

Uploading in the multipart mode

Yes

No

Yes

No

No

Yes

Listing uploaded parts

Yes

Yes

Yes

No

No

Yes

Canceling multipart uploads

Yes

No

Yes

No

No

Yes

Managing OBS Resource Permissions

Access to OBS buckets and objects can be controlled by IAM user permissions, bucket policies, and ACLs.

For more information, see OBS Permission Control.