Creating Custom Policies

You can create custom policies to supplement system-defined policies and implement more refined access control.

You can create custom policies in either of the following two ways:

Visual editor: Select cloud services, actions, resources, and request conditions without the need to know policy syntax.
JSON: Edit JSON policies from scratch or based on an existing policy.

The following describes how to create a custom policy that allows users to modify DNS zones in the visual editor and JSON view.

This section provides examples of common custom DNS policies.

Creating a Custom Policy in the Visual Editor

Log in to the management console.
On the management console, hover over the username in the upper right corner, and choose Identity and Access Management from the drop-down list.
In the left navigation pane, choose Permissions.
Click Create Custom Policy.
The Create Custom Policy page is displayed.
Enter a policy name.
Select a scope in which the policy will take effect based on the type of services to be set in this policy.
- Global services: Select this option if the services to which the policy is related are available for all regions once deployed. When creating custom policies for globally deployed services, specify the scope as Global services. Custom policies of this scope must be attached to user groups in the Global service region.
- Project-level services: Select this option if the services to which the policy is related are deployed in specific regions. When creating custom policies for regionally deployed services, specify the scope as Project-level services. Custom policies of this scope must be attached to user groups in specific regions except the Global service region.
Select Project-level services here.

A custom policy can contain actions of multiple services that are all globally available or all deployed only in specific projects. To define permissions required for accessing both globally available and project-specific services, create two custom policies and specify the scope respectively as Global services and Project-level services.
Select Visual editor.

In the Policy Content area, configure a custom policy.

Select Allow or Deny.
Select Cloud service.

Only one cloud service can be selected for each permission block. To configure permissions for multiple cloud services, click Add Permissions or switch to the Creating a Custom Policy in the JSON View.
Select actions.
(Optional) Select a resource type. For example, if you select Specific, you can click Specify resource path to specify the resource to be authorized.

(Optional) Add request conditions by specifying condition keys, operators, and values.

**Table 1** Criterion
Name	Description
Condition Key	A key in the Condition element of a statement. There are global and service-level condition keys. Global-level condition key: The prefix is g:, which applies to all operations, as shown in Table 2. Project-level condition key: The prefix is the abbreviation of a service, for example, dns:. This key applies only to the operations of the corresponding service.
Operator	Used together with a condition key to form a complete condition statement.
Value	Used together with a condition key and an operator that requires a keyword, to form a complete condition statement.

**Table 2** Global request condition
Global condition keys	Type	Description
g:CurrentTime	Time	Time when an authentication request is received. The time is in ISO 8601 format, for example, 2012-11-11T23:59:59Z.
g:DomainName	String	Account name
g:MFAPresent	Boolean	Whether to use multi-factor authentication (MFA) to obtain a token
g:MFAAge	Value	Validity period of the token obtained through MFA. This condition must be used together with g:MFAPresent.
g:ProjectName	String	Project name
g:ServiceName	String	Service name
g:UserId	String	IAM user ID
g:UserName	String	IAM username

(Optional) Switch to the JSON view. Then you can modify the policy content in the JSON structure.

If the JSON structure is wrong after modification, check the content, or click Reset to cancel the modification
(Optional) To add another permission block for the policy, click Add Permissions. Alternatively, click the plus (+) icon on the right of an existing permission block to clone its permissions.
(Optional) Describe the policy.
Click OK. The custom policy is created.
Assign the policy to a user group so that users in the group can inherit the permissions of the policy by referring to Creating a User and Granting DNS Permissions.

Creating a Custom Policy in the JSON View

Log in to the management console.
On the management console, hover over the username in the upper right corner, and choose Identity and Access Management from the drop-down list.
In the left navigation pane, choose Permissions.
Click Create Custom Policy.
The Create Custom Policy page is displayed.
Enter a policy name.
Select a scope in which the policy will take effect based on the type of services to be set in this policy.
- Global services: Select this option if the services to which the policy is related are available for all regions once deployed. When creating custom policies for globally deployed services, specify the scope as Global services. Custom policies of this scope must be attached to user groups in the Global service region.
- Project-level services: Select this option if the services to which the policy is related are deployed in specific regions. When creating custom policies for regionally deployed services, specify the scope as Project-level services. Custom policies of this scope must be attached to user groups in specific regions except the Global service region.
Select Project-level services here.

A custom policy can contain actions of multiple services that are all globally available or all deployed only in specific projects. To define permissions required for accessing both globally available and project-specific services, create two custom policies and specify the scope respectively as Global services and Project-level services.
Select JSON.
(Optional) Click Select Existing Policy, and select a policy to use it as template, such as DNS FullAccess.
Click OK.
Modify the statements in the template.
- Effect: Enter Allow or Deny.
- Action: Enter the actions listed in the DNS API actions table, for example, dns:zone:create.
The Version value of a custom policy must be 1.1.
(Optional) Describe the policy.
Click OK. If the policy list is displayed, the policy is created successfully. If a message indicating incorrect policy content is displayed, modify the policy.
Assign the policy to a user group so that users in the group can inherit the permissions of the policy by referring to Creating a User and Granting DNS Permissions.