Policy-based Authorization Overview

This section describes the actions supported by EVS in role/policy-based authorization.

Supported Actions

EVS provides system-defined policies that can be directly used in IAM. You can also create custom policies to supplement system-defined policies for more refined access control. Actions supported by policies are specific to APIs. See the following 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
Dependencies: actions which a specific action depends on. When allowing an action for a user, you also need to allow any existing action dependencies for that user.
IAM projects/Enterprise projects: the 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 contain actions only for IAM projects can be used and applied to IAM only. Administrators can check whether an action supports IAM projects or enterprise projects in the action list. For details about the differences between IAM and enterprise management, see Differences Between IAM and Enterprise Management.

EVS supports the following actions in custom policies:

API version query actions (API Version Query), including actions supported by EVS version query APIs, such as the APIs for querying API versions.
Disk actions (Disk), including actions supported by EVS disk APIs, such as the APIs for creating a disk, querying disks, deleting a disk, and updating a disk.
Actions of disk actions (Disk Action), including actions supported by EVS disk actions, such as the APIs for expanding the capacity of a disk, exporting a disk as an image, and setting read-only flag for a disk.
Snapshot actions (Snapshot), including actions supported by EVS snapshot APIs, such as the APIs for creating a snapshot, querying snapshots, updating a snapshot, and deleting a snapshot.
Tag actions (Tag), including actions supported by EVS tag APIs, such as the APIs for deleting tags by key, batch adding tags, batch deleting tags, and querying tags.
Disk transfer actions (Disk Transfer), including actions supported by EVS disk transfer APIs, such as the APIs for creating a disk transfer, querying disk transfers, accepting a disk transfer, and deleting a disk transfer.