Fine-grained authentication in configuration centers - Microservices Engine

Nacos configuration centers of Microservices Engine (MSE) allow you to configure access permissions based on instances, namespaces, groups, or data IDs. This prevents malicious users from obtaining or modifying configurations of an instance. This topic describes how to configure fine-grained authentication for Nacos configuration centers of MSE.

Prerequisites

MSE is activated. For more information, see Activate MSE.
A Nacos engine is created. For more information, see Create a Nacos engine.
Authentication is enabled. For more information, see Enable authentication.
A RAM user or a RAM role is created. For more information, see Create a RAM user or Create a RAM role.

Procedure

This topic describes how to grant and configure access permissions on the direct connection of the engine shown in the following figure. After the permissions are granted, you can use the Nacos client to access the MSE Nacos instance as a RAM user.

幻灯片1.JPG

Note

To configure and use access authentication for engine control, you need to grant the RAM user the permissions to use the MSE console. For more information, see Grant permissions on Microservices Registry resources.

Step 1: Create a fine-grained policy

Log on to the RAM console with an Alibaba Cloud account or a RAM user who has administrative rights.
In the left-side navigation pane, choose Permissions > Policies.
On the Policies page, click Create Policy.
On the Create Policy page, click the JSON tab.

Configure the policy and click Next to edit policy information.

The following table describes the actions that are involved in fine-grained authentication in configuration centers.

Action	Description
mse:QueryNacosConfig	The read permission on configurations of an MSE Nacos configuration center. These permissions allow you to obtain and monitor configurations by using SDKs.
mse:UpdateNacosConfig	The update permission on configurations of an MSE Nacos configuration center. This permission allows you to release and modify configurations by using SDKs.

The resources that are involved in fine-grained authentication in a configuration center must be specified in the following format:
```
acs:mse:*:*:instance/${instance_id}/${namespaceId}/${group}/config/${dataId}
```
You can also modify the policy document based on the description provided in Examples.
For more information about the syntax and structure of RAM policies, see Policy structure and syntax.

Specify the Name and Description fields.
Check and optimize the content of the custom policy.
- Basic optimization
  The system automatically optimizes the policy statement. The system performs the following operations during basic optimization:
  - Deletes unnecessary conditions.
  - Deletes unnecessary arrays.
- (Optional) Advanced optimization
  You can move the pointer over Optional: advanced optimize and click Perform. The system performs the following operations during the advanced optimization:
  - Splits resources or conditions that are incompatible with actions.
  - Narrows down resources.
  - Deduplicates or merges policy statements.
Click OK.

Step 2: Grant permissions to a RAM user or a RAM role

Grant permissions to a RAM user

Log on to the RAM console with an Alibaba Cloud account or a RAM user who has administrative rights.
In the left-side navigation pane, choose Identities > Users.
On the Users page, find the required RAM user and click Add Permissions in the Actions column.
In the Select Policy section of the Grant Permission panel, click the Custom Policy tab. Enter the name of the policy that you created in Step 1 in the text box. In the policy list, click the name of the policy in the Authorization Policy Name column and click OK.
In the Grant Permission panel, confirm the authorization information and click Complete.

Grant permissions to a RAM role

Log on to the RAM console with an Alibaba Cloud account or a RAM user who has administrative rights.
In the left-side navigation pane, choose Identities > Roles.
On the Roles page, find the RAM role to which you want to grant permissions and click Grant Permission in the Actions column.
You can also select multiple RAM roles and click Grant Permission below the RAM role list to grant permissions to multiple RAM roles at a time.
In the Select Policy section of the Grant Permission panel, click the Custom Policy tab. Enter the name of the policy that you created in Step 1 in the text box. In the policy list, click the name of the policy in the Authorization Policy Name column and click OK.
In the Grant Permission panel, confirm the authorization information and click Complete.

Examples

Grant a user the read-only permission on configurations of specific instances.

{
    "Version": "1",
    "Statement": [
        {
            "Action": [
                "mse:QueryNacosConfig"
            ],
            "Resource": [
                "acs:mse:*:*:instance/${instanceId1}",
                "acs:mse:*:*:instance/${instanceId2}"
            ],
            "Effect": "Allow"
        }
    ]
}

Grant a user the permission to read and modify configurations of specific instances.

{
    "Version": "1",
    "Statement": [
        {
            "Action": [
                "mse:QueryNacosConfig",
                "mse:UpdateNacosConfig"
            ],
            "Resource": [
                "acs:mse:*:*:instance/${instanceId1}",
                "acs:mse:*:*:instance/${instanceId2}"
            ],
            "Effect": "Allow"
        }
    ]
}

Grant a user the read-only permission on configurations in a specific namespace of an instance.

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "mse:QueryNacosConfig",
            "Resource": "acs:mse:*:*:instance/${instance_id}/${namespaceId}"
        }
    ],
    "Version": "1"
}

Grant a user the permission to read and modify configurations of the ${group} group in a specific namespace of an instance.

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "mse:QueryNacosConfig",
                "mse:UpdateNacosConfig"
            ],
            "Resource": "acs:mse:*:*:instance/${instance_id}/${namespaceId}/${group}"
        }
    ],
    "Version": "1"
}

Grant a user the read-only permission on the ${dataId} configuration of the ${group} group.

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "mse:QueryNacosConfig",
            "Resource": "acs:mse:*:*:instance/${instance_id}/${namespaceId}/${group}/config/${dataId}"
        }
    ],
    "Version": "1"
}

Grant a user the permission to read and modify the ${serviceName} service of the ${group} group.

{
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "mse:QueryNacosConfig",
                "mse:UpdateNacosConfig"
            ],
            "Resource": "acs:mse:*:*:instance/${instance_id}/${namespaceId}/${group}/config/${dataId}"
        }
    ],
    "Version": "1"
}