Help Center/ Simple Message Notification/ User Guide/ Using IAM to Grant Permissions to Using SMN/ Using IAM Identity Policies to Grant Access to SMN
Updated on 2025-11-21 GMT+08:00
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Using IAM Identity Policies to Grant Access to SMN

System-defined permissions in Identity Policy-based Authorization provided by Identity and Access Management (IAM) let you control access to SMN. With IAM, you can:

  • Create IAM users or user groups for employees based on your enterprise's organizational structure. Each IAM user will have their own identity credentials for accessing SMN resources.
  • Grant users only the permissions required to perform a given task based on their job responsibilities.
  • Entrust a Huawei Cloud account or cloud service to perform efficient O&M on your SMN resources.

If your Huawei Cloud account meets your permissions requirements, you can skip this topic.

Figure 1 shows the process flow of identity policy-based authorization.

Prerequisites

Before granting permissions, learn about system-defined permissions in Identity Policy-based Authorization for SMN. To grant permissions for other services, learn about all system-defined permissions supported by IAM.

Process Flow

Figure 1 Process for granting the SMN permissions
  1. Create an IAM user or create a user group.

    On the IAM console, create an IAM user or user group.

  2. Attach a system-defined identity policy to the user or user group.

    Attach the SMNReadOnlyPolicy identity policy to the IAM user or user group.

  3. Log in as the IAM user and verify permissions.

    In the authorized region, perform the following operations:

    • Click Service List and select Simple Message Notification. On the SMN console, choose Topic Management > Topics and click Create Topic in the upper right corner. If the topic is successfully created, the SMN Administrator permissions have already taken effect.
    • Choose any other service from Service List. If a message appears, indicating that you have insufficient permissions to access the service, the SMN Administrator permissions have already taken effect.

Example Custom Identity Policies

You can create custom identity policies to supplement the system-defined identity policies of SMN. Add actions in custom identity policies as needed. For details about supported actions, see Actions Supported by Identity Policy-based Authorization.

To create a custom identity policy, choose either visual editor or JSON.

  • Visual editor: Select cloud services, actions, resources, and request conditions. This does not require knowledge of policy syntax.
  • JSON: Create a JSON policy or edit an existing one.

For details, see Creating a Custom Identity Policy and Attaching It to a Principal.

When creating a custom identity policy, use the Resource element to specify the resources the identity policy applies to and use the Condition element (service-specific condition keys) to control when the identity policy is in effect. For details about supported resource types and condition keys, see Actions Supported by Identity Policy-based Authorization. The following are examples of custom identity policies of SMN.

  • Example 1: Grant the read-only permissions for message notifications. 
    {
    "Version": "5.0",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "smn:topic:listTopic",
                "smn:topic:get",
                "smn:topic:listAttributes",
                "smn:topic:listSubscriptionsByTopic",
                "smn:topic:listSubscriptions",
                "smn:template:listTemplates",
                "smn:template:get",
                "smn:tag:list",
                "smn:topic:listLogTank"
            ]
        }
    ]
}
  • Example 2: Create a custom identity policy that contains multiple actions.

    A custom policy can contain the actions of one or multiple services. The following is a custom policy containing multiple actions:

    {
    "Version": "5.0",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "smn:topic:listTopic",
                "smn:topic:listAttributes"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "ecs:cloudServers:listResizeFlavors",
                "ecs:cloudServers:listServerTags"
            ]
        }
    ]
}